CN102096295A - Laser projection system - Google Patents

Abstract

The laser projection system comprises a projection screen and a laser projector, wherein the projection screen comprises at least one light-emitting layer which is provided with at least one luminescent substance which is a substance capable of being excited to generate excited light in another wavelength range when being irradiated by excitation light in a certain wavelength range, and the transverse distance between particles of each luminescent substance in a direction parallel to the plane of the projection screen is far smaller than the diameter of the cross section of a laser beam; the laser projector comprises a laser light source module, a laser signal modulation module, a light combination module, a rotary plane mirror control module and a signal conversion module, wherein excitation laser is generated according to an image signal of a single picture or a dynamic picture, and is projected onto a matched projection screen to generate an image, so that a projection screen with high identification can be presented on the projection screen in a nearly transparent effect under the environment of natural light, the projection screen can be seen, an object behind the projection screen can be seen at the same time, and the use efficiency and the application range of a laser projection system are improved.

Description

laser projection system

technical field

The present invention relates to a laser projection system, especially a laser projector that uses a single image or a dynamic image signal to generate excitation laser light and project it onto a matching projection screen to generate an image. The projection screen can present a highly recognizable projection picture with almost transparent effect under the environment of natural light, so that people can see the projection picture and see the objects behind the projection screen at the same time.

Background technique

There are many previous technologies related to the design of laser projection systems, including US6,986,581, US7,090,355, US7,182,467, US7,213,923, US7,452,082, etc., which disclose related technologies of films used as projection screens; Including US6,843,568 and its references (References Cited) and other public information are related technologies for disclosing laser scanning display devices (laser scanning display); for example, US6,329,966 discloses UV beam on phosphorescent dots on thin films on film) related technology; such as US4,213,153 discloses the related technology of modulating UV laser on phosphor material to form image (modulated UV laser on phosphorus material to form image); such as US6,900,916 discloses scanning ultraviolet light on fluorescent film Related technologies for forming images (scanned UV light togenerate images on fluoresce film).

来改变调变激光光束L_M反射后的方向，可使调变激光光束L_M快速扫描投影幕101上每个画素所对应的位置。投影幕101会散射调变激光光束L_M，以显示画面。As shown in FIG. 1 , a prior art laser projection system 100 includes a laser projector 10 and a projection screen 101 . The laser projector 10 is used to project an image onto the projection screen 101 according to the image signal S _I . The laser projector 10 includes a laser light source module 110 and a rotating plane mirror module 120 . The laser optics module 110 includes a red visible laser source 111 , a blue visible laser source 112 , a green visible laser source 113 , an optical combination module 115 , and a modulation module 114 . The red visible light laser source 111, the blue visible light laser source 112, and the green visible laser light source 113 are respectively used to emit red visible light, blue visible light, and green visible laser beam L _R according to the driving currents I _RD , I _BD , and I _GD . , L _B , L _G . The modulating module 114 is used to respectively provide the driving currents I _RD , I _BD , and I _GD of the red visible laser source 111 , the blue visible laser source 112 , and the green visible laser source 113 according to the image signal S _I , to control the laser beams respectively. L _R , L _B , and _LG perform signal modulation so that they respectively reach the light intensity required by the corresponding pixel color on the screen 101 . The light combining module 115 is used to converge the laser beams _LR , _LB , and _LG to the same path and direction to generate a modulated laser beam _LM . The rotating plane mirror module 120 is used to reflect the modulated laser beam L _M to the projection screen 101 . In this way, the laser projector 10 adjusts the deflection angle θ and the deflection angle by controlling the rotating plane mirror module 120

By changing the reflected direction of the modulated laser beam L _M , the modulated laser beam L _M can quickly scan the position corresponding to each pixel on the projection screen 101 . The projection screen 101 scatters the modulated laser beam L _M to display images.

的有限，投影幕与激光投影器之间的距离D必须拉长，才能产生较大的投影画面；第三，当背景光中的可见光照射到该显像荧幕时，亦将由荧幕散射或反射为观察者所接收，而降低成像画面的色彩对比。本发明即针对上述先前技术的缺点而加以有效解决，藉以增进激光投影系统的使用功放及扩展其应用领域。The above-mentioned laser projection technology has the following disadvantages: First, in order to use the principle of scattering to form an image, the display screen is opaque, thus limiting the application of this imaging technology in the need of a transparent display screen, such as projecting images on driving The vehicle head-up display of the windshield in front of the seat; second, due to the deflection angle θ of the rotating plane mirror module and

limited, the distance D between the projection screen and the laser projector must be elongated in order to produce a larger projection picture; third, when the visible light in the background light hits the display screen, it will also be scattered by the screen or The reflection is received by the viewer and reduces the color contrast of the imaging picture. The present invention effectively solves the above-mentioned shortcomings of the prior art, so as to improve the power amplifier used in the laser projection system and expand its application field.

Contents of the invention

The object of the present invention is to provide a laser projection system, which uses a laser projector, so that the laser projector can generate excitation laser light according to the image signal of a single picture or a dynamic picture, and project it onto a matching projection screen To produce an image frame, wherein the projection screen comprises at least one luminescent layer with at least one luminescent substance, which is a substance that can be excited to generate excited light of another wavelength range when irradiated by excitation light of a certain wavelength range, and The lateral distance between the particles of each luminous substance parallel to the plane of the projection screen is much smaller than the cross-sectional diameter of the laser beam, so that the projection screen can present a highly recognizable projection screen with an almost transparent effect under natural light , allowing the user to see the projected image and see objects behind the projection screen at the same time, so as to improve the efficiency and application range of the laser projection system.

Another object of the present invention is to provide a laser projection system, which can further use wavelengths of invisible light, including but not limited to 808nm, 850nm, 980nm, and 1064nm, etc., or choose wavelengths that are less sensitive to human eyes, including and Not limited to 405nm, 780nm, etc., as the laser light source of the laser light source module, an excitation light source with a color similar to the excited light can be selected, including but not limited to wavelengths of about 405nm (blue-purple) and 450nm (blue). Laser light excites the luminescent layer to produce a blue (wavelength about 450nm) image, or excites the luminescent layer with 780nm (red) and 640nm (red) laser light to produce a red (wavelength about 640nm) image, so as to reduce the projection caused by the excitation light Color mixing phenomenon caused by reflection or scattering of curtain.

Another object of the present invention is to provide a laser projection system, wherein the laser light source module further includes a first-type laser light source module and a second-type laser light source module, and the matching transparent projection screen includes a light-emitting layer and A scattering layer, and the light-emitting layer is in front of the scattering layer to face the beam projected by the laser projector; wherein the first type of laser light source module includes at least one group of laser light sources that can respectively emit corresponding wavelengths and fall into the light-emitting layer The laser light of the first type of wavelength in the excitation light wavelength range of various luminescent substances is used to respectively excite various luminescent substances in the luminescent layer, so that the excited light is generated respectively; wherein the second type of laser light source module includes at least one set of laser light The light source can respectively emit the laser light of the second type of wavelength; wherein the light-emitting layer has extremely low absorption and scattering of the laser light of the second type of wavelength emitted by the second type of laser light source module, so that most of the second type of wavelength The laser light can pass through the light-emitting layer and enter the scattering layer, and can absorb most of the laser light of the first type of wavelength emitted by the first type of laser light source module; wherein the scattering layer is used to scatter the laser light of the second type of wavelength and Excited light in the light-emitting layer excited by the first type of wavelength laser light.

Another object of the present invention is to provide a laser projection system, wherein the luminescent layer of the projection screen can further be combined with other various functional layers, including an excited light absorbing layer, an exciting light absorbing layer, an excited light and scattered light absorbing layer, Scattering layer, excitation light reflection layer, excited light partial reflection layer, excited light and scattered light partial reflection layer, light concentrating layer, partial light shielding layer, etc., cooperate to form a projection screen, so as to improve the laser projection system. Use effect and application field.

Another object of the present invention is to provide a laser projection system, wherein the laser projector further includes at least one convex mirror arranged between the rotating flat mirror module and the projection screen in the laser projector, or further includes at least one flat mirror module It is arranged between the convex reflector and the projection screen, so that the laser beam generated by the laser projector can be projected on the projection screen through the reflection of the convex reflector or the plane reflector module after passing through the rotating plane mirror module, In order to expand the scanning angle of the laser beam, the height and width of the projected image can be effectively increased under the condition that the distance between the projection screen and the laser projector remains unchanged.

To answer the above object, the present invention provides the following technical solutions: it is a laser projection system, including a projection screen and a laser projector, the laser projector generates excitation light according to the image signal of a single picture or a dynamic picture, and then projected onto a matching transparent projection screen to generate an image, wherein:

The projection screen includes at least one luminescent layer, which is equipped with at least one luminescent substance F ₁ , F ₂ , ..., F _n , which includes any luminescent material that can be excited to produce another wavelength range when irradiated by excitation light in a certain wavelength range. The material that is excited by light, and the lateral distance between the particles of each luminescent material parallel to the plane of the projection screen is much smaller than the cross-sectional diameter of the laser beam;

The laser projector includes a laser light source module, a laser signal modulation module, a light combination module, a rotating plane mirror module, a rotating plane mirror control module and a signal conversion module;

Among them, the signal conversion module accepts various single-frame or dynamic-frame image signals S _I , and converts them into signals S _L for controlling the laser light source module and signals S _M for the rotating plane mirror module, and is responsible for coordinating the laser signal modulation module Synchronization of optical signal and rotating plane mirror module;

The laser light source module includes at least one group of laser light sources that respectively emit wavelengths λ _1L , λ _2L , ..., λ _nL and correspond to the excitation wavelength ranges λ _1S , λ _2S , .. ., λ _nS light beams L _1S , L _2S , ..., L _nS , to respectively excite various luminescent substances in the light-emitting layer to generate excited light of wavelengths λ _1E , λ _2E , ..., λ _nE ;

Wherein the light combination module converges the laser beams L _1S , L _2S , ..., L _nS (L _iS ) to the same path and direction to generate an overall modulated laser beam (L _M ) incident on the rotating plane mirror module, and is reflected by the rotating plane mirror module to form an overall modulated scanning laser beam (L _S ) to project onto the projection screen;

Wherein the rotating plane mirror module is used to rotate an angle (θ) on a first plane, and simultaneously rotate an angle on a second plane not parallel to the first plane

Wherein the rotating plane mirror control module is used to drive the rotation of the rotating plane mirror module, and after receiving the signal (S _M ) from the signal conversion module, it is converted into a signal for controlling the rotation angle of the plane mirror module, so that the rotation angle of the rotating plane mirror module is controlled by the rotating plane mirror The control of the control module is changed over time, so that the overall modulated scanning laser beam ( _LS ) scans all the positions on the projection screen where the excited light is to be generated;

Wherein the laser signal modulation module generates the driving current (I _i ) corresponding to each laser light source according to the image signal (S _I ) of a single picture or a dynamic picture provided by the signal conversion module, so as to respectively control the laser light of each wavelength The light beam (L _iS ) undergoes optical power modulation.

Description of drawings

FIG. 1 is a prior art schematic diagram of a laser projection system;

2 is a schematic diagram of a laser projection system 200 (embodiment 1) of the present invention;

2A-2C are respectively longitudinal schematic diagrams of three different structures of the light-emitting layer of the projection screen in FIG. 2;

3 is a schematic diagram of a laser projection system 300 (embodiment 2) of the present invention;

FIG. 3A is a schematic diagram of a basic structure of the projection screen in FIG. 3;

4 is a schematic diagram of a laser projection system 400 (embodiment 3) of the present invention;

4A-4E are schematic structural diagrams of several adjacent pixel spaces of the light-emitting layer of the projection screen in FIG. 4;

5 is a schematic diagram of a laser projection system 500 (embodiment 4) of the present invention;

6 is a schematic diagram of a simplified laser projection system 600 (embodiment 5) of the present invention;

7A-7K are respectively schematic diagrams of the first to eleventh structural types of the projection screen in the present invention (embodiment 6);

Fig. 7KA is a diagram of an example of the light-shielding layer (790) in Fig. 7K;

Fig. 7KB is a diagram of an example of the light concentrating layer (791) in Fig. 7K;

FIG. 7L is a schematic diagram of the twelfth structure of the projection screen in the embodiment of the present invention;

FIG. 8 is a schematic diagram of a laser projection system 800 (Embodiment 7) of the present invention that can expand the display screen;

Figure 8A is a cross-sectional view of the laser projection system in Figure 8 parallel to the x-z plane;

8B is a cross-sectional side view of the laser projection system in FIG. 8 parallel to the x-y plane;

Fig. 8C is a graph showing the relationship between the laser projection system (800) of the present invention in Fig. 8 when the convex mirror is placed in different positions on the x-z (or y-z) plane and the expanded scanning angle;

9 is a schematic diagram illustrating a laser projection system 900 (embodiment 8) of the second enlarged display screen of the present invention;

Description of reference numerals: 200, 300, 400, 500, 600, 800, 900—laser projection system; , 710, 711, 801, 901- projection screen; 202, 302, 402, 502, 602- laser projector; 210, 310, 410, 410, 810, 910- laser light source module; 220, 320, 420, 520- Laser signal modulation module; 230, 330, 430, 530-light combining module; 240, 340, 440, 540, 820, 920-rotating plane mirror module; 250, 350, 450, 550-rotating plane mirror control module; 260, 360 , 460, 560-signal conversion module; 270, 370, 470, 570-laser optical module; 231, 232, 233-substrate; 235-substrate; 236, 237, 238-microparticles; 311-first-class laser light source Module; 312-the second type of laser light source module; 331-luminescent layer; 332-scattering layer; 431, 441-pixel; 432-434, 442-444, 452-455, 462-465-subpixel (subpixel); 700 -Projection screen; 720, 720A-excited light absorbing layer; 730-luminescent layer; 740-exciting light absorbing layer; 720B-excited light and scattered light absorbing layer; 750-scattering layer; 760-exciting light reflecting layer; 770 -partial reflection layer of excited light; 780-partial reflection layer of excited light and scattered light; 790-partial shading layer; 791-light concentrating layer; 792-shading element; 793-opening; 796-imaging layer; 797-anti-ultraviolet layer; 80, 90-laser projector; 801-projection screen; 830, 930-convex mirror; 940-plane mirror module.

Detailed ways

<Example 1>

Referring to FIG. 2 , it is a schematic diagram of a laser projection system 200 according to Embodiment 1 of the present invention; the laser projection system 200 includes a projection screen 201 and a laser projector 202 . The laser projector 202 is used to project an image onto the projection screen 201 according to the image signal S _I of a single frame or a dynamic frame. The laser projector 202 includes a laser light source module 210 , a laser signal modulation module 220 , a light combining module 230 , a rotating plane mirror module 240 , a rotating plane mirror control module 250 and a signal conversion module 260 . In addition, the structure composed of the laser light source module 210 , the laser signal modulation module 220 and the light combination module 230 is defined as the laser optical module 270 for the convenience of discussion below.

The projection screen 201 is provided with a luminescent layer, and the luminescent layer is provided with one or more luminescent substances, represented by F ₁ , F ₂ , . . . , _Fn , where n is the number of types of luminescent substances. The luminescent substance includes any substance that is irradiated by light of a certain wavelength range and can be excited to generate light of another wavelength range, including but not limited to fluorescence (Fluorescence) substances, phosphorescence (Phosphorescence) substances, laser dyes, or lasers crystals etc. Various luminescent substances in the luminescent layer can be excited by light sources of various wavelengths (expressed in λ _1S , λ _2S , ..., λ _nS ), and are respectively excited to emit other wavelengths (expressed in λ _1E , λ _2E ,...,λ _nE represents) light. In order to make a single laser beam projected on each position on the projection screen to simultaneously excite all the wavelengths of the excited light, the cross-section of the single laser beam needs to cover a considerable number of all kinds of luminescent material particles. Therefore, the transverse distance (transverse distance) between various types of luminous substance particles parallel to the plane of the projection screen should be much smaller than the cross-sectional diameter of the laser beam. Here, the wavelengths _of λ _1S , λ _2S , . . . , λ _nS and λ _1E , λ _{2E ,} .

In order to pursue the excitation efficiency of the light-emitting layer and reduce the optical power of the excitation laser passing through the light-emitting layer, the light-emitting layer should absorb most of the energy of the excitation laser. If the luminescent layer is to be transparent, the scattering and absorption of visible light by the luminescent layer should be reduced. One of the necessary factors is to make the particle diameter of the luminescent material smaller than the shortest wavelength of visible light (about 360nm).

The longitudinal section of the light-emitting layer may include but not limited to the structure shown in FIG. 2A , FIG. 2B or FIG. 2C . As shown in FIG. 2A , FIG. 2B and FIG. 2C , circles, triangles and squares represent three different luminescent substances, but the present invention is not limited to three kinds of luminescent substances. In FIG. 2A, a substrate 231, including but not limited to TN (Twisted Nematic, twisted nematic), STN (Super Twisted Nematic, super twisted nematic), PC (polyester resin, Polycarbonate resin), COC (olefin Copolymers, cyclo-olefin copolymers), PET (polyethylene terephthalate, polyethyleneterephthalate), epoxy (epoxy resin) and other transparent plastic materials or glass, contain several kinds of luminescent substances. When various luminescent substances are uniformly distributed in all positions that may be irradiated by excitation light in this substrate, it is easy to set the beam of excitation light wavelength (in the form of L _1S , L _2S , ..., L _nS ) light power (indicated by P _1E , P _2E , ..., P _nE ) to produce the required luminous energy per unit area of the excited light.

In FIG. 2B , three substrates 232 , 233 , 234 , including but not limited to TN, STN, PC, COC, PET, epoxy and other transparent plastic materials, each contain a luminescent substance. When each luminescent substance is dispersed in a uniform manner in a separate substrate at all positions that may be illuminated by the excitation light, the optical power of the beam of excitation light wavelength can be easily set to produce the desired excited light luminous energy per unit area. In FIG. 2B , each substrate 232 , 233 , 234 only includes one layer of luminescent material, but it is not limited thereto.

In FIG. 2C , a substrate 235 is used to carry microparticles 236 , 237 and 238 respectively containing various luminescent substances. The microparticles 236 , 237 and 238 are respectively loaded with different luminescent substances by different substrates. The microparticles 236, 237, and 238 are uniformly distributed on the substrate 235 at all positions that may be irradiated by the excitation light.

In order to make the single laser beam Ls projected on the projection screen 201 to simultaneously excite all the wavelengths of the excited light at each position, the cross-section of the single laser beam needs to cover a considerable number of all kinds of luminescent material particles. Therefore, the cross-sections of the micro-particles 236, 237 and 238 parallel to the substrate 235, and the transverse distance between the micro-particles parallel to the plane of the projection screen should be much smaller than the cross-sectional diameter of the laser beam.

Compared with the structure of FIG. 2A and FIG. 2B , the structure of FIG. 2C can adjust the distribution density of various microparticles at different positions on the substrate more easily. When the beam of the same light energy is scanned at different positions on the projection screen, the luminescent layer is excited to produce different combinations of excited light energy, which is especially suitable for the static image display system shown in FIG. 5 . The architecture and working principle of FIG. 5 are described in detail below.

The fabrication method of FIG. 2C includes and is not limited to the following: firstly, various luminescent substances are respectively dissolved in respective solutions, and the solutions include and are not limited to Epoxy (epoxy resin). The respective solutions containing the respective luminescent substances are then respectively formed into micro-particles by means including but not limited to inkjet, vapor deposition, etc., and placed on the substrate 235, and finally the substrate 235 containing various micro-particles is cured.

The signal converting module 260 receives various single-frame or dynamic-frame image signals S _I and converts them into signals S _L for controlling the laser light source module 210 and signals _SM for rotating the plane mirror module 240 . The signal converting module 260 is also responsible for coordinating the synchronization of the optical signal of the laser signal modulating module 220 and the rotating plane mirror module 240 .

The laser light source module 210 includes one or more sets of laser light sources, which can respectively emit wavelengths λ _1L , λ _2L , ..., λ _nL , which correspond to and fall into the excitation wavelength ranges λ _1S , λ of various luminescent substances in the luminescent layer The light beams of _2S ,...,λ _nS , denoted by L _1S , L _2S ,...,L _nS , are used to respectively excite various luminescent substances in the light-emitting layer to generate λ _1E , λ _2E ,..., Light of wavelength λ _nE .

In order to make the optical power per unit area of λ _1E , λ _2E , ..., λ _nE wavelengths generated by each point on the projection screen 201 can be controlled by the optical power of L _1S , L _2S , ..., L _nS respectively, it should be It is avoided that a single excitation light produces more than or equal to two or more excited light wavelengths. When selecting the laser wavelength and the luminescent material in the luminescent layer, it is necessary to reduce the overlap of the distribution range between λ _iS and λ _jS , where 1≤i, j≤n and λ _iE ≠λ _jE , and reduce the irradiation of λ _iS to any luminescent layer The luminescent substance in produces any excited light energy not equal to the wavelength of λ _iE .

In addition, the optical power of the laser with the wavelength λ _iL is limited by the manufacturing process of the laser with this wavelength. If the pursuit of increasing the luminous energy per unit area of a certain wavelength λ _iE includes the following two methods: first, the m kinds of luminescent substances in the luminescent layer can be made into different wavelength ranges, λ _1mS , λ _2mS , .. ., λ _mmS , the light is excited, and the excited light of the same wavelength λ _iE is produced. And m laser light sources are arranged in the laser light source module 210 , the wavelengths of which respectively correspond to the excitation wavelength ranges of the luminescent substances, wherein m≧2. Therefore, the luminous energy per unit area of wavelength λ _iE generated by each beam projection position on the luminescent layer is the sum of the excited light generated by the m luminescent substances excited by the m laser light sources. Second, because the excitation wavelength distribution range of the luminescent substance is generally larger than the wavelength distribution range of the excitation laser light source. Therefore, the excitation light wavelength λ _iS can be selected to have a wide distribution range, and a luminescent substance with an excited light wavelength λ _iE can be produced. And arrange m ₂ laser light sources in the laser light source module 210, the wavelengths of which are all in the range of the excitation wavelength λ _iS of the luminescent substance, wherein m ₂ ≥ 2. Therefore, the luminous energy per unit area of the wavelength λ _iE produced by each beam projection position on the luminescent layer is the sum of the excited light generated by the luminescent material excited by the _m2 laser light sources.

The light combining module 230 includes and is not limited to being composed of various wavelength filters or prisms, which converge the laser beams L _1S , L _2S , ..., L _nS to the same path and direction, to generate an overall modulated laser beam L _M . The overall modulated laser beam L _M is incident on the rotating plane mirror module 240 and is reflected by the rotating plane mirror module 240 to form an overall modulated scanning laser beam _LS to be projected onto the projection screen 201 .

The rotating plane mirror module 240 includes and is not limited to two orthogonal (Orthogonal) one-dimensional polygonal mirror (Polygon Mirror) modules, two orthogonal one-dimensional microelectromechanical (MEMS) mirrors, or one two-dimensional microelectromechanical (MEMS) mirror , can be rotated by an angle θ in a first plane, and can also be rotated by an angle in a second plane that is not parallel to the first plane

The rotating plane mirror control module 250 drives the rotating plane mirror module 240 to rotate, and receives the signal S _M from the signal conversion module 260 and converts it into a signal capable of controlling the rotation angle of the plane mirror module 240 . The rotation angle of the rotating plane mirror module 240 can be changed over time under the control of the rotating plane mirror control module 250 . As the rotation angle of the rotating plane mirror module 240 changes, the overall modulated scanning laser beam L _S scans all positions on the projection screen 201 where excited light is to be generated. The rotating plane mirror module 240 may rotate periodically or aperiodically. The scanning form of the overall modulated scanning laser beam _LS on the scanning projection screen 201 includes but not limited to raster scanning, Lissajous scanning or vector scanning. The laser beams of wavelengths λ _1S , λ _2S , ..., λ _nS in the overall modulated scanning laser beam L _S respectively excite the luminescent substances F ₁ , F ₂ , ..., F _n in the luminescent layer of the projection screen 201 , so that it generates light with wavelengths λ _1E , λ _2E , ..., λ _nE .

The laser signal modulation module 220 is used to generate the driving current corresponding to each laser light source according to the image signal S _I of a single frame or a dynamic frame provided by the signal conversion module 260, I ₁ , I ₂ , . . . , _In , so as to modulate the optical power of the laser beams of each wavelength, L _1S , L _2S , . . . , L _nS .

The higher the optical power of the excitation light, the longer the time for the excitation light to be scanned through a certain position on the projection screen, and the higher the density of the luminescent substance, all can make the position of the projected projection screen excite the excited light with higher optical power. The luminous energy per unit area of the excited light of various wavelengths at a certain position on the projection screen 201, and the value of the corresponding excitation light power multiplied by the time of scanning through the position, according to the density of the respective luminescent substances (in the form of D ₁ , D ₂ ,..., _Dn said) fixed into a certain proportional relationship.

When the luminous energy per unit area of the i-th excited wavelength at a certain position on the projection screen is to be P _iE , then when the overall modulated scanning laser beam L _S scans to this position, it will correspond to the excited wavelength Adjust the optical power P _iS of the L _iS of the laser beam, or adjust the time τ of scanning through a certain position on the projection screen, so that it can excite the luminescent substance at this position in the projection screen to generate the luminous energy per unit area of P _iE .

The i-th luminous substance at the position (x, y) in the excitation projection screen is excited by the light beam L _iS to generate the luminous energy per unit area of P _iE (x, y), which can be expressed as:

P_iS(x，y)为当光束L_iS扫描在位置(x，y)时由激光光源模块所发射的光功率，L_O代表光束L_iS经过合光模块、旋转平面镜模块反射及介于激光光源模块210与投影幕201间所有光学元件所生的光功率损耗参数，一般可视L_O与位置ρ无关，τ(x，y)为总体调变扫描激光光束L_S扫描经过位置(x，y)的时间，D_i(x，y)为位置(x，y)上第i个发光物质的密度，

为位置(x，y)上第i种发光物质将激发光波长λ_iS转换为被激发光波长λ_iE的单位面积光功率转换效率，

受

与D_i(x，y)的影响。在第i种发光物质的

并不受

影响的状况下，C_i可简化为

在

一式中，τ(x，y)可根据旋转平面镜模块240的旋转模式计算而得，L_O与

可经量测而得，因此我们可通过激光调便模块220改变P_iS(x，y)以追求所欲达成的P_iE(x，y)。Among them, (x, y) is the spatial coordinate of the position, is the optical power of beam L _iS scanning at position (x, y),

P _iS (x, y) is the optical power emitted by the laser light source module when the light beam L _iS is scanned at the position (x, y), L _O represents the light beam L _iS is reflected by the light combining module, the rotating plane mirror module and between the laser The optical power loss parameters generated by all the optical components between the light source module 210 and the projection screen 201 can generally be seen that _LO has nothing to do with the position ρ, and τ(x, y) is the overall modulated scanning laser beam _LS scanning through the position (x, y), D _i (x, y) is the density of the i-th luminescent substance at position (x, y),

is the optical power conversion efficiency per unit area of the i-th luminescent substance at the position (x, y) converting the excitation light wavelength λ _iS to the excited light wavelength λ _iE ,

by

Influence with D _i (x, y). of the i-th luminescent substance

not subject to

In the case of influence, C _i can be simplified as

exist

In the formula, τ(x, y) can be calculated according to the rotation mode of the rotating plane mirror module 240, L _O and

It can be obtained by measurement, so we can change P _iS (x, y) through the laser adjustment module 220 to pursue the desired P _iE (x, y).

The scanning speed of the laser light Ls on the projection screen 201 is not constant due to the rotation mode of some rotating plane mirror modules 240 . Therefore, the time τ(x, y) for scanning through the position ρ on the projection screen 201 is not consistent. When the density of the luminescent substances at each position on the projection screen is equal, that is, D _i (x, y)=D _i , if any position on the projection screen is to reach the preset luminous energy P _iE per unit area, It is necessary to adjust the value of P _iS (x, y) according to the time τ(x, y) of the overall modulated scanning laser beam L _S scanning through the position (x, y), instead of giving a fixed value to make P _iS (x , y)=P _iS .

Taking laser scanning methods such as Raster Scanning and Lissajous Scanning as examples, the scanning speed of the laser beam at the edge of the screen is slower than that at the center of the screen, so the time it takes for the laser beam to pass through a certain position in the edge area is shorter than the time it takes to pass through a certain position in the central area for long. If the density of the i-th luminescent substance at each position on the projection screen is equal, if the light energy per unit area of the same excited light wavelength λ _iS is to be pursued, it is necessary to reduce the wavelength of scanning to the edge region by λ _iL Laser light power. The basic thinking principles and calculation methods are as follows, and the present invention is not limited to the following examples, and those whose basic thinking principles and calculation methods are the same as the following examples all belong to the scope of the present invention.

则得下列关系式：Set the rotation angle of the two-dimensional rotating mirror at time t=0

Then the following relationship is obtained:

θ(t)＝θ ₀ *sin(2π/T _θ *t);

分别为该二维旋转反射镜使激光光束沿x轴与y轴旋转的最大旋转角度，T_θ与

分别为其旋转周期。为简化计算，令该投影幕为一平面，在(x，y)＝(0，0)的点垂直正交于在θ＝0，

的激光光束，则x＝D*tan(θ(t))且y＝D*tan(θ(t))，D为二维旋转反射镜与投影幕的最短距离。利用上述关系式，可求得在x轴的扫描速度v_x(x)＝dx/dt及y轴的扫描速度v_y(y)＝dy/dt。在(x，y)点的扫描速度即为v(x，y)＝(v_x ²(x)+v_y ²(y))^1/2。为使单位面积发光能量在投影幕上皆一致，应使P_iS(x，y)正比于

在第i种发光物质的

并不受

影响的状况下，应设定P_iS(x，y)正比于v(x，y)＝(v_x ²(x)+v_y ²(y))^1/2。where θ ₀ and

Respectively, the two-dimensional rotating mirror makes the laser beam rotate along the x-axis and the y-axis maximum rotation angle, T _θ and

are their rotation periods, respectively. To simplify the calculation, let the projection screen be a plane, the point at (x, y) = (0, 0) is perpendicular to the point at θ = 0,

laser beam, then x=D*tan(θ(t)) and y=D*tan(θ(t)), D is the shortest distance between the two-dimensional rotating mirror and the projection screen. Using the above relational formula, the scanning velocity v _x (x)=dx/dt on the x-axis and v _y (y)=dy/dt on the y-axis can be obtained. The scanning speed at point (x, y) is v(x, y)=(v _x ² (x)+v _y ² (y)) ^1/2 . In order to make the luminous energy per unit area consistent on the projection screen, P _iS (x, y) should be proportional to

of the i-th luminescent substance

not subject to

In the case of influence, P _iS (x, y) should be set to be proportional to v(x, y)=(v _x ² (x)+v _y ² (y)) ^1/2 .

If the rotation speed of the two-dimensional mirror makes the time required for the overall modulated scanning laser beam L _S to scan through each position of the projection screen less than the observer's image interception exposure time, then the laser beam scans through each position Excited to form each light The dots will be recognized together by the observer to form a picture. The image capture exposure time of the observer is the duration of vision of the human eye (about 1/16 second) for the human eye, and is the exposure time of each frame for the camera or video camera.

When the continuous rotation time of the two-dimensional mirror exceeds the exposure time of the observer's image interception, several frames can be formed. If the rotation speed of the two-dimensional mirror is sufficient to make the update time of each frame shorter than the observer's image capture exposure time, then the several frames will be recognized as continuous dynamic frames by the observer.

In addition, when the relaxation process time (Relaxing Process Time) of a luminescent substance is greater than the update time of each picture, the observer will observe the remaining excited light from the previous picture, which will form afterimages. Therefore, in a projection system that intends to form a continuous dynamic picture, light-emitting substances with a short mitigation process should be selected, such as fluorescent substances, laser dyes, and laser crystals.

An application example of the laser projection system 200 is a full-color laser projection display system. Take a full-color laser projection display system with a single primary color of α-bit (2 ^α- layer color gradation) as an example. The laser beams L _RS , L _GS , and L _BS with wavelengths of λ _RS , λ _GS , and λ _BS can excite the luminescent substances _FR , F _G , and F _B in the luminescent layer of the projection screen, respectively, so that the maximum optical power per unit area is generated, respectively. are the red, green and blue three-color lights of P _REM , P _GEM and P _BEM , and the wavelengths of the excited three primary colors are denoted by λ _RE , λ _GE , and λ _BE respectively. Then the relative ratios of P _REM , P _GEM , and P _BEM should meet the ratio to achieve the white balance of the image frame.

When the color to be displayed at a certain position on the projection screen corresponds to red, green, and blue as the n _R , n _R , and n _R color levels respectively, if it is not considered that the human eye has a sharper perception of visible light with lower optical power , the optical power P _RL , P _GL , P _BL of the laser beam L _RS , LG _GS , L _BS scanning through this position should be adjusted so that the light-emitting layer of the projection screen produces red, green, and blue light power per unit area respectively (n _R -1)/(2 ^α -1)*P _REM , (n _G -1)/(2 ^α -1)P _GEM , (n _B -1)/(2 ^α -1)P _BEM .

Considering that the human eye has a sharper perception of visible light with lower optical power, and the Gamma Correction Factor (Gamma Correction Factor) γ is introduced, the optical power of the laser beams L _RS , LG _GS , and L _BS scanning through this position should be adjusted P _RL , P _GL , P _BL make the light-emitting layer of the projection screen generate red, green, and blue light power per unit area respectively [(n _R -1)/(2 ^α -1)] ^1/γ P _REM , [ (n _G -1)/(2 ^α -1)] ^1/γ P _GEM , [(n _B -1)/(2 ^α -1)] ^1/γ P _BEM .

To pursue the same lightness, hue and chroma for each position on the projection screen when the same red, green and blue are respectively n _R , n _R , and n _R gradations ), the values of the maximum unit area optical power P _REM , P _GEM , and P _BEM do not vary with the position. However, the maximum luminous powers P _RLM , _PGLM , and P _BLM of the laser beams L _RS , LG _GS , and L _BS need to be adjusted by carefully checking the distribution density of various luminescent substances at each position on the projection screen and the scanning speed of the laser beam. . The method has been described in detail above. Here, only the following simple examples are given to further illustrate the control of the laser light powers P _RL , P _GL , and P _BL .

When all kinds of luminous substances on the projection screen are uniformly distributed, and the full-color laser projection imaging system adopts raster scanning (Raster Scanning) or Lissajous Scanning (Lissajous Scanning) laser scanning method, and ignores red, The optical power conversion efficiencies C _R , C _G , and C _B of the three luminescent substances of green and blue are affected by the incident light power, and the maximum luminous power P _RLM of each laser light source module when the beam scans to the position (x, y) of the projection screen (x, y), P _GLM (x, y), P _BLM (x, y) should be proportional to the speed v(x, y) of the beam scanning to the position (x, y), that is:

P _RLM (x, y) = P _RLM (0, 0) * v (x, y) / v (0, 0); P _GLM (x, y) = P _GLM (0, 0) * v (x, y)/v(0,0);

P _BLM (x, y)=P _BLM (0,0)*v(x,y)/v(0,0).

Since v(0, 0) ≥ v(x, y), P _RLM (x, y) ≤ P _RLM (0, 0), P _GLM (x, y) ≤ P _GLM (0, 0), P _BLM (x,y)≦P _BLM (0,0). In order to make the full-color laser projection display system have the brightest image, we should not only consider the mutual ratio of P _REM , P _GEM , and P _BEM to achieve white balance, but also consider the production process of the laser light source and its life cycle to select the possible Maximum P _RLM (0,0), P _GLM (0,0), P _BLM (0,0) values.

If it is not considered that the human eye has a sharper perception of visible light with lower optical power, the optical power of the laser beams L _RS , LG _GS , and L _BS scanning through the (x, y) position should be adjusted:

P _RL (x, y)=(n _R -1)/(2 ^α -1)*P _RLM (x, y)=(n _R -1)/(2 ^α -T)*P _RLM (0,0 )*v(x,y)/v(0,0);

P _GL (x, y)=(n _G -1)/(2 ^α -1)*P _GLM (x, y)=(n _G -1)/(2 ^α -1)P _GLM (0,0) *v(x,y)/v(0,0);

P _BL (x, y)=(n _B -1)/(2 ^α -1)*P _BLM (x, y)=(n _B -1)/(2 ^α -1)*P _BLM (0,0 )*v(x,y)/v(0,0).

Considering that the human eye has a sharper perception of visible light with lower optical power, and the gamma correction factor (Gamma Correction Factor) γ is introduced, the laser beams L _RS , LG _GS , and L _BS should be adjusted to scan through (x, y) Optical power at position:

P _RL (x, y) = [(n _R -1)/(2 ^α -1)] ^1/γ *P _RLM (x, y) = [(n _R -1)/(2 ^α -1)] ^1/γ *P _RLM (0,0)*v(x,y)/v(0,0);

P _GL (x, y) = [(n _G -1)/(2 ^α -1)] ^1/γ *P _GLM (x, y) = [(n _G -1)/(2 ^α -1)] ^1/γ *P _GLM (0,0)*v(x,y)/v(0,0);

P _BL (x, y) = [(n _B -1)/(2 ^α -1)] ^1/γ *P _BLM (x, y) = [(n _B -1)/(2 ^α -1)] ^1/γ *P _BLM (0,0)*v(x,y)/v(0,0).

If the rotation speed of the two-dimensional mirror makes the time for the overall modulated laser beam L _M to scan through all possible image spots on the projection screen to be less than the duration of human vision, then the laser beam scanning through each position excited and formed Each point of light will be recognized as a picture by the human eye.

If the rotation speed of the two-dimensional mirror is sufficient to make the update time of each frame shorter than the persistence time of human eyes, the projection system 200 can display visible continuous dynamic frames.

To avoid picture afterimages, you need to select the relaxation process time (Relaxing Process Time) to be less than the update time of each picture, that is, 1/F second, where F is the frame rate (Frame rate) of the dynamic picture display system in Hz. Rate), the luminescent substance.

In addition, in order to increase the brightness of the image, w kinds of broad-spectrum luminescent substances can also be added to the luminescent layer of the projection screen, wherein w≥1. Broad-spectrum luminescent substances can be excited to generate wavelengths, represented by λ _1WE , λ _2WE , ..., λ _wWE , λ _iWE covers more than one primary color wavelength of light, for example, covers green and blue dichroic wavelengths, or covers red and green and blue trichromatic wavelength, where 1≤i≤w. In addition, w _laser light sources are arranged in the laser light source module 210, the wavelengths of which are denoted by λ _1WS , λ _2WS , .

In order to further pursue the white balance of the images produced by the w kinds of broad-spectrum luminescent substances, it is necessary to design the mutual ratio between the optical powers of the w kinds of lasers, so that the excited broadband wavelengths, λ _1WE , λ _2WE , ..., λ _wWE , the sum of the light energy meets the requirement of white balance in color science.

In addition, in order to expand the color gamut of the image, g kinds of luminescent substances for expanding the color gamut can also be added to the light emitting layer of the projection screen, wherein g≥1. The color gamut-expanded luminescent material can be excited to generate wavelengths, represented by λ _1GE , λ _2GE , . . . , λ _gGE . And on the CIE chromaticity diagram (Chromaticity Diagram), the area formed by the total (g+3) wavelengths of λ _1GE , λ _2GE , ..., λ _gGE and λ _RE , λ _GE , λ _BE is larger than only The area formed by λ _RE , λ _GE , λ _BE . In addition, g laser light sources are added in the laser light source module 210 , the wavelengths of which are located in the excitation wavelength ranges of the g color-gamut-expanded luminescent substances. The general image signal S _I contains the image information of the three primary colors of red, green and blue. The signal conversion module 260 should convert S _I into red, green, and blue primary colors plus λ _1GE , λ _2GE ,..., λ _gGE image information, and use it to control the red, green, and blue excitation laser beams L _RS , L _GS , L _BS and g to stimulate the light power of the laser light source to expand the color gamut of the luminescent material, so as to truly present the color of the position scanned by the laser beam on the projection screen.

In order to reduce the number of types of laser light sources and luminescent substances that expand the color gamut, when selecting λ _1GE , λ _2GE , ..., λ _gGE , the manufacturing process of the laser light source and luminescent substances that expand the color gamut should be considered, and the minimum g to achieve a relatively large color area.

Since the exciting light is inevitably reflected or scattered by the projection screen, the wavelength distribution of the reflected or scattered light will be the same as that of the exciting light. If the excitation light has a better sensitivity to human eyes, the observer receives the excitation light and the excited light at the pixel at the same time, resulting in color mixing and degrading the color contrast of the image. In order to avoid the above situation, a better way is to use wavelengths of invisible light, including but not limited to 808nm, 850nm, 980nm, and 1064nm, etc., or choose wavelengths that are less sensitive to human eyes, including but not limited to 405nm, and 780nm and other lasers are used as the laser light source of the laser light source module 210 .

If it is still unavoidable to use visible light as the excitation light source, select an excitation light source with a color similar to that of the excited light. Including but not limited to excitation of the luminescent layer by laser light with a wavelength of about 405nm (blue-purple) and 450nm (blue) to produce a blue (wavelength of about 450nm) image, and excitation with laser light of 780nm (red) and 640nm (red) to emit light The layer produces a red (wavelength about 640nm) image. Because the excitation light source and the excited light have similar colors, the phenomenon of color mixing caused by the reflection or scattering of the excitation light by the projection screen can be reduced.

Another simplified application example of the laser projection system 200 is to use a 405nm semiconductor laser as the laser light source 210, and use a two-dimensionally rotatable MEMS mirror, or a combination of two one-dimensionally rotatable MEMS mirrors to form a rotating plane mirror module 240. The projection screen 201 includes a luminescent layer, and the luminescent layer includes a luminescent substance that can be excited by a wavelength of 405 nm to generate red, blue or green visible light. The projection screen 201 is also transparent. If this projection screen is pasted on the windshield in front of the driver's seat of the vehicle, it is a principle not to affect the driving line of sight. The laser projector 202 is installed in the vehicle, and projects the laser beam on the projection screen 201 . The signal conversion module 260 receives the image signal S _I from image source components including but not limited to computers, mobile phones, GPS, night vision cameras, and visible light cameras in a wired or wireless manner, and displays various information on the projection screen 201. Including but not limited to vehicle speed, mileage, fuel consumption, maps, warnings, directions, phone numbers, etc.

<Example 2>

Referring to FIG. 3 , it is a schematic diagram of a laser projection system 300 according to Embodiment 2 of the present invention; the laser projection system 300 includes a projection screen 301 and a laser projector 302 . The laser projector 302 is used to project an image onto the projection screen 301 according to the image signal S _I of a single frame or a dynamic frame. The laser projector 302 includes a laser light source module 310 , a laser signal modulation module 320 , a light combining module 330 , a rotating plane mirror module 340 , a rotating plane mirror control module 350 , and a signal conversion module 360 . In addition, a laser optical module 370 is defined, which includes a laser light source module 310 , a laser signal modulation module 320 and an optical combining module 330 for the convenience of discussion below.

Among them, the structure and working principle of the laser signal modulation module 320, the light combination module 330, the rotating plane mirror module 340, the rotating plane mirror control module 350 and the signal conversion module 360 set by the laser projector 302 are respectively the same as those set by the laser projector 202. The laser signal modulation module 220 , light combination module 230 , rotating plane mirror module 240 , and rotating plane mirror control module 250 are similar to the signal conversion module 260 , so details are not repeated here.

The main difference between this embodiment 2 and the foregoing embodiment 1 is that the laser light source module 310 in the laser projector 302 includes a first-type laser light source module 311 and a second-type laser light source module 312, and the projection screen 301 includes A light-emitting layer 331 and a scattering layer 332; that is, the first type of laser light source module 311 and the light-emitting layer 331 of the present embodiment 2 are equivalent to the light-emitting layer of the laser light source module 210 and the projection screen 201 of the embodiment 1, and the present embodiment Example 2 is to add a second type laser light source module 312 and a scattering layer 332 . Therefore, in this embodiment 2 or other following embodiments, anyone who can use the same working principle as that of embodiment 1 or any previous embodiment to achieve the same or similar effect as that of embodiment 1 or the previous embodiment, such as the first The laser-like light source module 311 and the light-emitting layer 331 are the same as the corresponding laser light source module 210 and the effect of the light-emitting layer of the projection screen 201 in Embodiment 1. Both can refer to Embodiment 1, so in Embodiment 2 or other subsequent No more details will be given in the embodiments.

The laser light source module 310 includes a first type laser light source module 311 and a second type laser light source module 312 . The first type of laser light source module 311 includes one or more sets of laser light sources, which can respectively emit wavelengths λ _11L , λ _21L , ..., λ _n1L , which correspond to and fall into the excitation wavelength range of various luminescent substances in the luminescent layer λ _1S , λ _2S , ..., λ _nS light beams, represented by L _11S , L _21S , ..., L _n1S , are used to respectively excite various luminescent substances in the light-emitting layer to generate λ _1E , λ _2E , ..., light of wavelength λ _nE .

The second type of laser light source module 312 includes one or more sets of laser light sources, which can respectively emit light beams with wavelengths λ _12L , λ _22L , . . . , λ _n2L , denoted by L _12S , _{L 22S ,} .

A basic structure of the projection screen 301 is shown in FIG. 3A , which includes a light emitting layer 331 and a scattering layer 332 . Before the scattering layer 332, the luminous layer 331 faces the beam Ls projected and scanned by the laser projector 302, and _D1 is the medium outside the luminous layer 331 facing the incident light source.

The scattering layer 332 can destroy the unidirectionality of the incident laser light, and generate multidirectional scattered light with the same wavelength as the incident laser light.

The luminescent layer 331 contains one or several kinds of luminescent substances that can be respectively excited by light sources of various wavelengths (expressed as λ _1S , λ _2S , ..., λ _nS ), and can be respectively excited to emit light of various other wavelengths ( denoted by λ _1E , λ _2E , . . . , λ _nE ) light. The basic structure, basic working principle and basic characteristics of the luminescent layer 331 and the luminescent material therein are the same as those of the luminescent layer and luminescent material in the projection screen 201 in the laser projection system 200 of Embodiment 1, so details are not repeated here.

The light-emitting layer 331 has extremely low absorption and scattering of the laser light of the second type of wavelength emitted by the second type of laser light source module 312 . Therefore, most of the laser light of the second type of wavelength can pass through the light emitting layer 331 and enter the scattering layer 332 .

In order to pursue the excitation efficiency of the light emitting layer 331 , the light emitting layer 331 should absorb most of the laser light of the first type of wavelength emitted by the first type of laser light source module 311 . Therefore, the scattering layer 332 is mainly used for scattering the laser light of the second type of wavelength and the excited light excited by the first type of wavelength laser in the light emitting layer 331 .

The interface between the medium _D1 and the light-emitting layer 331 can be treated with anti-reflection, including but not limited to inserting an anti-reflection layer to reduce the light of two types of modulated laser beam wavelengths, and the light excited by the light-emitting layer 331 at the interface reflection. Therefore, the ratio of the first type of modulated laser beam entering the light-emitting layer 331 can be increased, the ratio of the second type of modulated laser beam entering the dispersion layer 332 can be increased, and the ratio of the excited light generated by the light-emitting layer 331 entering _D1 can be increased. The proportion can also increase the proportion of light scattered by the scattering layer entering _D1 . Therefore, when the observer is located on the _D1 side of the projection screen, a higher image brightness of the excited light and the scattered light can be observed.

The interface between the luminescent layer 331 and the scattering layer 332 can be anti-reflection treatment for the wavelength of the second type of modulated laser beam, so as to increase the second type of modulated laser beam entering the scattering layer 332 and the light scattered by the scattering layer 332 entering the medium D ₁ ratio. Therefore, when the observer is located on the _D1 side of the projection screen, a higher image brightness of the scattered light can be observed.

The interface between the light-emitting layer 331 and the scattering layer 332 can be highly reflectively processed for the wavelength of the first type of modulated laser beam, so as to reflect the residual energy of the first type of modulated laser light after passing through the light-emitting layer 331, so that it returns to the light-emitting layer 331 to increase the optical power of the excited light. Therefore, when the observer is located on the _D1 side of the projection screen, a higher image brightness of the excited light can be observed.

The laser signal modulation module 320 is used to generate the driving current corresponding to each laser according to the image signal S _I of a single picture or a dynamic picture provided by the signal conversion module 360, I ₁₁ , I ₂₁ , . . . , _In1 and The size of I ₁₂ , I ₂₂ , ..., I _n2 , for the laser beams of each wavelength, L _11S , L _21S , ..., L _n1S and L _12S , L _22S , ..., L _n2S , for optical power modulation.

As mentioned above, the higher the optical power of the first type of laser light, the longer the time for the first type of laser light to scan through a certain position on the projection screen, and the higher the density of luminous substances, all can make the position of the projected projection screen Excited light with higher optical power is excited. The luminous energy per unit area of the excited light of various wavelengths at a certain position on the projection screen, and the value of the corresponding first-class laser light power multiplied by the time of scanning through the position, are fixed in a certain proportion according to the density of the luminous substances respectively. relation.

Similarly, the higher the optical power of the second type of laser light, the longer the time for the second type of laser light to scan through a certain position on the projection screen, and the higher the scattering efficiency, all can make the position of the projected projection screen scatter more light. Scattered light of high optical power. The luminous energy per unit area of scattered light of various wavelengths at a certain position on the projection screen, and the value of the corresponding second-type laser light power multiplied by the time of scanning through the position, are fixed to a certain ratio according to the scattering efficiency of the scattering layer relation.

As the two types of light wavelength lasers in the modulated laser beam _LS , that is, the laser light of different wavelengths emitted by the first type of laser light source module 311 and the second type of laser light source module 312, scan on the projection screen 301, The image may thus consist of scattered laser light of the second wavelength type and the excited light in the light-emitting layer excited by the laser light of the first wavelength type.

An application example of the laser projection system 300 is a full-color laser projection display system. Take a full-color laser projection display system with a single primary color of α-bit (2 ^α- layer color gradation) as an example.

In order to expand the color gamut of the image, it includes the following two methods that can be used at the same time: first, g kinds of luminescent substances that expand the color gamut can also be added to the luminescent layer 331 of the projection screen, and the first type of laser light source module 311 Add g laser light sources in the configuration, the wavelengths of which are located in the excitation wavelength range of the g color gamut-enlarged luminescent substances, and their functions and efficacy can refer to embodiment 1; secondly, increase the configuration h in the second type of laser light source module 312 A laser light source can generate wavelengths of λ _1HE , λ _2HE , ..., λ _hHE respectively, where h≥1; and on the CIE chromaticity coordinate diagram, the λ _1HE , λ _2HE , ..., λ _hHE The area formed by (h+3) wavelengths of λ _RE , λ _GE , λ _BE is greater than the area formed by only λ _RE , λ _GE , λ _BE . Because the general image signal S _I contains the image information of the three primary colors of red, green, and blue. The signal conversion module 360 should convert S _I into λ _RE , λ _GE , λ _BE plus λ _1GE , λ _2GE , . . . , λ _gGE and λ _1HE , λ _2HE , . . . , λ _hHE , It is also used to control the laser light power of the laser beams L _RS , L _GS , L _BS and the g types of first-type laser light source modules 311 and the h types of second-type laser light source modules 312, so as to truly present the laser beams on the projection screen scanning to position of the color.

In order to reduce the number of required laser light sources and expand the color gamut of luminescent substances, when selecting λ _1GE , λ _2GE , ..., λ _gGE and λ _1HE , λ _2HE , ..., λ _hHE , the laser light source should be weighed With the production process of luminous substances that expand the color gamut, the pursuit is to achieve a relatively large color area with the smallest (g+h).

In this full-color laser projection imaging system, except that λ _1WS , λ _2WS , ..., λ _wWS must be excited by the laser light generated by the first type of laser light source module, the λ _RE , λ _GE generated on the projection screen , λ _B and λ _1GE , λ _2GE , ..., λ _gGE and λ _1HE , λ _2HE , ..., λ _hHE (3+g+h) kinds of light wavelengths (where g, h≥0) The energy can be excited by the laser light generated by the first type of laser light source module, or generated by the scattering of laser light generated by the second type of laser light source module. The luminescent layer must also contain one or more luminescent substances, which can be respectively excited by the laser light source of the first-type laser light source module to generate light of certain wavelengths among the (3+g+h) wavelengths. The second type of laser light source module includes light of other wavelengths in the (3+g+h) wavelengths.

In order to avoid color mixing, wavelengths of invisible light should be used, including but not limited to 808nm, 850nm, 980nm, and 1064nm, or wavelengths that are less sensitive to human eyes, including but not limited to 405nm, 780nm, etc. The laser is used as the laser light source of the first type of laser light source module 311 . If it is still unavoidable to use visible light as the excitation light source, select an excitation light source with a color similar to that of the excited light. Including but not limited to excitation of the luminescent layer by laser light with a wavelength of about 405nm (blue-purple) and 450nm (blue) to produce a blue (wavelength of about 450nm) image, and excitation with laser light of 780nm (red) and 640nm (red) to emit light The layer produces a red (wavelength about 640nm) image. Because the excitation light source and the excited light have similar colors, the phenomenon of color mixing caused by the reflection or scattering of the excitation light by the projection screen can be reduced.

Due to the immature technology of green semiconductor lasers, it is generally necessary to use the second harmonic generation (Second Harmonic Generation) method to convert laser light with a wavelength of 1064nm into green light (532nm) laser light. Therefore, the green laser module with high profile, variable frequency, wide width and high power is not only bulky, but also has high production cost and complicated control. In the full-color laser projection imaging system of the laser projection system 300, one application example is to use blue and red lasers as the laser light sources of the first type of laser light source module 311, and use 405nm or 980nm lasers to excite the A luminescent substance, so that full-color moving images can be formed on a projection screen.

<Example 3>

Referring to FIG. 4 , it is a schematic diagram of a laser projection system 400 according to Embodiment 3 of the present invention; the laser projection system 400 includes a projection screen 401 and a laser projector 402 . The laser projector 402 is used to project an image onto the projection screen 401 according to the image signal S _I of a single frame or a dynamic frame. The laser projector 402 includes a laser light source module 410 , a laser signal modulation module 420 , a rotating plane mirror module 440 , a rotating plane mirror control module 450 , and a signal conversion module 460 . In addition, a laser optical module 470 is defined, which includes a laser light source module 410 and a laser signal modulation module 420 for the convenience of discussion below.

Wherein, the structure and working principle of the rotating plane mirror module 440, the rotating plane mirror control module 450, and the signal conversion module 460 are similar to the rotating plane mirror module 240, the rotating plane mirror control module 250, and the signal conversion module 260 respectively, so they are not repeated here.

The projection screen 401 can be divided into several pixels 431 corresponding to the screen resolution to be displayed, in terms of the image quality of SVGA (Super Video Graphics Array), that is, 800x600=480,000 pixels. The structures of several pixels adjacent to the light emitting layer of the projection screen 401 may include but are not limited to the structures shown in FIG. 4A and FIG. 4B .

In FIG. 4A , a single pixel 431 includes three subpixels (red, blue, and green), denoted by 432 , 433 , and 434 respectively. In FIG. 4B , a single pixel 441 includes red, blue, and green sub-pixels, denoted by 442 , 443 , and 444 respectively. The area of each sub-pixel is not necessarily equal. The arrangement of sub-pixels between adjacent pixels can be the same as shown in FIG. 4A or different as shown in FIG. 4B. Each sub-pixel is distributed with its own luminescent material. These three luminescent substances include but are not limited to fluorescent substances, and can be respectively excited by light beams in the wavelength ranges λ _RS , λ _GS , λ _BS to produce red, blue, and green lights with wavelengths λ _RE , λ _GE , λ _BE . The basic structures, basic working principles and basic characteristics of the three luminescent substances are the same as those of the luminescent substances in the laser projection system 200 according to Embodiment 1 of the present invention, so they will not be repeated here.

The laser light source module 410 includes a group of laser light sources that can emit light beams with a wavelength λ _L that fall within the wavelength range of the excitation light of the three luminescent substances in the luminescent layer, denoted by L _L .

In order to precisely control the excited light energy generated by each sub-pixel, the minimum length of each sub-pixel should be greater than the cross-sectional diameter of the laser beam L _L , and there should be a certain distance between various sub-pixels to avoid The laser beam is irradiated to more than two kinds of sub-pixels at the same time.

In addition, the scanning path of the laser beam is aligned with the arrangement of the sub-pixels on the projection screen 401 to prevent the laser light from irradiating more than two kinds of sub-pixels at the same time.

The laser signal modulation module 420 is used to generate the magnitude of the driving current I ₁ of the laser light source according to the image signal S _I of a single frame or a dynamic frame provided by the signal conversion module 460, so as to perform optical power P _L on the laser beam _{L L} modulation. When _LS scans to a certain pixel of a certain pixel, the driving current _I1 provided by the laser signal modulation module 420 can make the optical power _PL excite the pixel to generate the optical power of the color. Through different combinations of light energy excited by red, blue, and green sub-pixels, the pixel can display different lightness, hue, and chroma; as for the working principles and control methods of different lightness, hue, and chroma, please refer to the implementation example 1.

In addition, in order to increase the brightness of the image, white sub-pixels can also be added to the projection screen. The luminescent substance contained in the white sub-pixel can be excited by the laser beam L _S to generate a wide-spectrum wavelength λ _WE covering red, green and blue wavelengths. The structure of the light-emitting module adding white sub-pixels includes and is not limited to those shown in FIGS. 4C and 4D . In FIG. 4C , 451 is a single pixel, which includes four sub-pixels of red, blue, green, and white, respectively denoted by 452, 453, 454, and 455. In FIG. 4D , 461 is a single pixel, which includes four sub-pixels of red, blue, green, and white, respectively denoted by 462, 463, 464, and 465. The area of each sub-pixel is not necessarily equal. The arrangement of sub-pixels between adjacent pixels can be the same, as shown in FIG. 4C, or different, as shown in FIG. 4D.

In addition, in order to expand the color gamut of the image, g types of sub-pixels that expand the color gamut can be added to the projection screen, where g≥1. The luminescent substances contained in the expanded color gamut sub-pixels can be excited by the laser beam L _S to generate wavelengths, represented by λ _1GE , λ _2GE , . . . , λ _g1GE . And on the CIE chromaticity coordinate diagram, the area formed by the total (g+3) wavelengths of λ _1GE , λ _2GE , ..., λ _gGE and λ _RE , λ _GE , λ _BE is larger than only λ _RE , λ The area formed by _GE and λ _BE . The sub-pixel with expanded color gamut and the four sub-pixels of red, blue, green, and white can be arranged together in the same pixel, and the light emitting module structure includes but is not limited to that shown in FIG. 4E.

In order to avoid color mixing, wavelengths of invisible light should be used, including but not limited to 808nm, 850nm, 980nm, and 1064nm, or wavelengths that are less sensitive to human eyes, including but not limited to 405nm, 780nm, etc. The laser serves as the laser light source of the laser light source module 410 .

<Example 4>

Please refer to FIG. 5 , which is a schematic diagram illustrating a laser projection system 500 according to Embodiment 4 of the present invention; the laser projection system 500 includes a projection screen 501 and a laser projector 502 . The laser projector 502 projects laser beams onto the projection screen 501 . The laser projector 502 includes a laser light source module 510 , a laser light source control module 520 , a rotating plane mirror module 540 , a rotating plane mirror control module 550 and a signal coordination module. In addition, a laser optical module 570 is defined, which includes a laser light source module 510 and a laser signal modulation module 520 for the convenience of discussion below.

Wherein, the structures and working principles of the rotating plane mirror module 540 and the rotating plane mirror control module 550 are similar to those of the rotating plane mirror module 240 and the rotating plane mirror control module 250 respectively, so details are not repeated here.

The projection screen ₅₀₁ is provided with a luminescent layer, the luminescent layer contains one or several luminescent _substances , F ₁ , F ₂ , . , and are respectively excited to emit light of different wavelengths (expressed by λ _1E , λ _2E , ..., λ _nE ). The basic structure, basic working principle, and basic characteristics of the luminescent layer and the luminescent substance are the same as those of the luminescent layer and the luminescent substance in the laser projection system 200 in Embodiment 1 of the present invention, so details are not repeated here.

If it is desired to make a certain position of the projection screen generate light of a wavelength λ _iE with a higher light energy per unit area, then the position has a higher distribution density of luminescent substances F _i .

The laser light source module 510 includes a group of laser light sources that can emit a wavelength λ _L that can excite all luminescent substances, and the beams thereof are denoted by L _L .

Because the light energy per unit area of the emission wavelength λ _iE at a certain position of the projection screen is determined by the light energy per unit area of the excitation light wavelength λ _L and the density of the luminescent substance F _i at the same time. When the light beam L _L scans each position on the projection screen to provide the same light energy per unit area, the image frame is determined by the density of the luminescent substance F _i at the position. When making the luminescent layer, the static image to be formed can be determined by determining the distribution density of various luminescent substances F _i at each position on the projection screen.

In order to make the luminescent substance F _i have the same density at each position on the projection screen, and can produce the same light energy per unit area of wavelength λ _iE , it is necessary to scan the laser beam to provide the same excitation light energy per unit area at each position on the projection screen . Therefore, the optical power _PL (x, y) of the laser beam scanning to the position (x, y) should be proportional to the scanning speed v(x, y) of this position. At this time, the signal coordination module 560 can be used to coordinate the synchronization of the optical power of the laser light source and the rotation angle of the two-dimensional rotating mirror.

If the light beam L _L has the same optical power during the scanning process, the synchronous control of the optical power of the laser light source and the rotation angle of the two-dimensional rotating mirror can be simplified. In this situation, if one wants to pursue the same light energy per unit area of wavelength λ _iE at each position on the projection screen, it is necessary to make the density distribution of the luminescent substance F _i at each position on the projection screen proportional to the laser beam scanning to ( Scanning velocity v(x,y) at position x,y).

<Example 5>

Please refer to FIG. 6 , which is a schematic diagram of a simplified laser projection system 600 of the present invention; the projection system 600 includes a projection screen 601 and a projection light source 602 . The projection light source 602 projects light onto the projection screen 601 . The structure and working principle of the projection screen 601 are the same as those of the projection screen 501 in Embodiment 4, and will not be repeated here. The projection light source 602 can be a broadband light source or a narrow-band light source, and the emitted wavelength can simultaneously excite all the luminescent substances in the projection screen 601 to generate wavelengths λ _1E , λ _2E , . . . , λ _nE respectively. By determining the distribution densities of the luminous substances, F ₁ , F ₂ , _.

A specific embodiment in FIG. 6 is to use a lamp tube or a light bulb as the light source. The lamp tube contains luminescent substances that can excite the projection screen to produce red, green, blue, white, or colors that expand the color gamut. The distribution density of various luminous substances on the projection screen is determined by the static image to be displayed. The static image can be formed by uniformly projecting the light beam of the light source on the projection screen.

<Example 6>

This embodiment is an illustration of various structural types of the projection screen in the present invention. Referring to FIG. 7A , it is a schematic diagram of the first projection screen 700 of the present invention; the projection screen 700 includes an excited light absorbing layer 720 and a light emitting layer 730 . The light emitting layer 730 includes but is not limited to the structure of the light emitting layer shown in FIG. 2A , FIG. 2B , FIG. 2C , FIG. 4A , FIG. 4B , FIG. 4C , FIG. 4D , and FIG. 4E . Its working principle has been described in detail above and will not be repeated here.

The excited light absorbing layer 720 absorbs the excited light emitted from the light emitting layer 730 to reduce the excited light entering the medium _D1 side. Therefore, the observer or the light receiver can only see the displayed image or the detected light that the luminescent layer is excited on the D ₂ side, but cannot see the displayed image or the detected light that the luminescent layer is excited on the D ₁ side .

The excited light absorbing layer 720 can also be designed so that the absorption of visible light is very high, so the projection screen is completely opaque black. This projection screen is suitable for use as a rear projection display system to prevent human eyes from observing the internal circuits of the display system.

In addition, if the excited light absorbing layer 720 has lower absorption and scattering for the excitation wavelength of the projected light beam _LS , the projected light beam _LS1 can enter the projection screen from the _D1 side.

The projection light beam L _S1 or L _S2 incident on the projection screen 700 from the side _D1 or the _side D2 contains excitation light of one or more wavelengths to respectively excite various luminescent substances in the luminescent layer, so that the projection screen produces an image .

The interface between the medium _D1 and the excited light absorbing layer 720, and the interface between the excited light absorbing layer 720 and the light emitting layer 730 can be treated with anti-reflection, including but not limited to inserting an anti-reflection layer, so as to reduce the projection beam L _S2 The reflection of the two interfaces increases the luminous performance of the projection screen.

The interface between the luminescent layer 730 and the medium _D2 , and the interface between the excited light absorbing layer 720 and the luminescent layer 730 can be treated with anti-reflection treatment, including but not limited to inserting an anti-reflection layer to reduce the light belonging to the excited light spectrum. Reflection of the two interfaces. In this way, the light of the ambient background light L _A2 incident from the side of the medium _D2 that also belongs to the spectrum of the excited light is rarely reflected back to the side of _D2 , but will pass through the light emitting layer 730 and be absorbed by the excited light absorbing layer 720 . In addition, the light in the ambient background light L _A1 incident from the side of the medium D ₁ that also belongs to the spectrum of the excited light will also be absorbed by the excited light absorbing layer 720 . Therefore, the image displayed on the projection screen 700 can be less affected by the ambient background light L _A1 and L _A2 .

A specific embodiment of FIG. 7A selects the excited light to be visible light including red, green, blue, white, or a color with an expanded color gamut.

Referring again to FIG. 7B , it is a schematic diagram of a second projection screen 701 of the present invention; the projection screen 701 includes an excited light absorbing layer 720A, a light emitting layer 730 and an exciting light absorbing layer 740 .

The excitation light absorbing layer 740 can absorb the light of the wavelength used to excite the light emitting layer in the projected light beam _LS . The excitation light absorbing layer 740 has less absorption and scattering of the excited light, so the excited light generated by the light emitting layer 730 can be transmitted to the _D2 side without hindrance, and can be received by the observer.

Compared with FIG. 7A, although the excitation light absorption layer 740 added in FIG. 7B limits the projection of the light beam L _S1 to the projection screen 701 only from the _D1 side, it also ensures that the optical power of the projected light beam L _S1 will not pass through the light emitting layer 730. And enter the _D2 side, received by the observer.

In addition, the ambient background light L _A2 may also contain a wavelength that can excite the light emitting layer 730 to make it emit light. The excitation light absorbing layer 740 can ensure that the ambient background light L _A2 does not cause any image on the luminescent layer 730 , thus completely eliminating the influence of the ambient background light L _A2 on the image displayed on the projection screen.

A specific embodiment of FIG. 7B selects the excited light to be visible light including red, green, blue, white, or a color with an expanded color gamut.

Referring again to FIG. 7C , it is a schematic diagram of a third projection screen 702 of the present invention; the projection screen 702 includes an excited light and scattered light absorbing layer 720B, a light emitting layer 730 and a scattering layer 750 . The scattering layer 750 can destroy the unidirectionality of the incident laser light, and generate multidirectional scattered light with the same wavelength as the incident laser light. The excited light and scattered light absorbing layer 720B can not only absorb the light of the excited light spectrum, but also absorb the light of the scattered light spectrum.

Compared with FIG. 7A, in addition to replacing the excited light absorbing layer 720A in FIG. 7A with the excited light and scattered light absorbing layer 720B in FIG. 7C, a scattering layer 750 is added between the excited light absorbing layer 720 and the light emitting layer 730. between. Although thus limiting the projection of the projection light beam L _S2 to the projection screen only from the D ₂ side, it makes the projection screen 702 suitable for the application of the projection system 300 .

A specific embodiment of FIG. 7C is to select the excited light and the scattered light to be visible light including red, green, blue, white, or colors with an expanded color gamut.

Referring again to FIG. 7D , it is a schematic diagram of a fourth projection screen 703 of the present invention; the projection screen 703 includes a light emitting layer 730 and an excitation light reflecting layer 760 .

Because the light energy of the laser beam L _S1 may not be absorbed by the light-emitting layer 730, the excitation light reflection layer 760 reflects the residual energy of the projected light beam L _S1 after passing through the light-emitting layer 730, making it return to the light-emitting layer 730 and re-exciting the luminescent material therein , so that the luminous efficiency of the projection screen 703 can be improved, and the projected light beam L _S1 can be prevented from passing through the projection screen and entering the _D2 side, and being received by the observer. The excitation light reflective layer 760 has extremely low absorption and scattering of the excited light, so the excited light can enter the _D2 side without hindrance.

The interface between the luminescent layer 730 and the excitation light reflection layer 760 is processed, including but not limited to selecting similar optical indexes of the luminescence layer and the excitation light reflection layer, or inserting an anti-reflection layer for the excited light to reduce the number of luminescence layers. The reflection of excited light at this interface. The interface between the luminescent layer and the medium _D1 , and the interface between the excitation light reflection layer 760 and the medium _D2 can be treated with antireflection, including but not limited to inserting an antireflection layer, so as to reduce the excited light of the luminescent layer at the two interfaces. reflection. Therefore, the light excited by the light emitting layer 730 may not be confined within the projection screen 703 . Therefore, regardless of whether the observer or the light receiver is on any side of the projection screen 703 , they can see the displayed image or detect the light excited by the luminescent layer. The luminescent layer and the laser reflective layer can also be designed so that the absorption and scattering of visible light are extremely low, so the two layers are seen as transparent by human eyes, and the projection screen is transparent.

A specific embodiment of FIG. 7D is to select the excited light to be visible light including red, green, blue, white, or a color with an expanded color gamut.

Referring again to FIG. 7E , it is a schematic diagram of a fifth projection screen 704 of the present invention; the projection screen 704 includes a light emitting layer 730 , an excitation light reflecting layer 760 and a scattering layer 750 .

Compared with FIG. 7D , FIG. 7E adds an excitation light reflective layer 760 between the light emitting layer 730 and the scattering layer 750 to increase the light emitting layer 730 so that the projection screen 704 is suitable for the application of the projection system 300 .

A specific embodiment of FIG. 7E is to select the excited light and the scattered light to be visible light including red, green, blue, white, or colors with an expanded color gamut.

Referring again to FIG. 7F , it is a schematic diagram of the sixth projection screen 705 of the present invention; the projection screen 705 includes an excited light absorbing layer 720A, a light emitting layer 730 , an exciting light reflecting layer 760 and a scattering layer 750 .

Compared with Fig. 7C, Fig. 7F adds an excitation light reflective layer 760 between the luminescent layer 730 and the scattering layer 750, thereby increasing the luminous efficiency of the luminescent layer 730 and ensuring that the light power of the projected light beam L _S1 will not enter the _D2 side received by the observer.

A specific embodiment of FIG. 7F is to select the excited light and the scattered light to be visible light including red, green, blue, white, or a color with an expanded color gamut.

Referring again to FIG. 7G , it is a schematic diagram of the seventh projection screen 706 of the present invention; the projection screen 706 includes an excited light absorbing layer 720A, a scattering layer 750 , an exciting light reflecting layer 760 and a light emitting layer 730 .

Compared with FIG. 7C , an excitation light reflective layer 760 is added between the light emitting layer 730 and the scattering layer 750 in FIG. 7G , thereby increasing the luminous efficiency of the light emitting layer 730 .

A specific embodiment of FIG. 7G is to select the excited light and the scattered light to be visible light including red, green, blue, white, or colors with an expanded color gamut.

Referring again to FIG. 7H , it is a schematic diagram of an eighth projection screen 707 of the present invention; the projection screen 707 includes a partially reflective layer 770 for excited light and a light emitting layer 730 . The partly reflective layer 770 for the excited light can make the excited light incident from any side pass through in a proportion (for example, 20%), while it partially reflects (for example, 80%), and has a relatively high penetration for the excitation light. Proportion.

If the projected light beam L _S1 or L _S1 incident from the D ₁ side or the D ₂ side can both excite the light emitting layer 730 to generate excited light. The excited light can be received by the observer O ₂ on the D ₂ side to form a projected image. Since the excited light can also partially penetrate the partially reflective layer 770 to the side of _D1 , the observer _O2 can also receive the projected image formed by the excited light.

In addition to the projected image, the image observed by the observer O ₁ also includes the image of the object in D ₂ (including the observer O ₂ ) received by the observer O ₁ through the projection screen and reflected by the observer O 2 through the projection screen. The image of the object in D ₁ received by O ₁ (including observer O ₁ ). Similarly, in addition to the projected image, the image observed by the observer O ₂ also includes the image of the object in D ₁ received by the observer O ₂ through the projection screen (including the observer O ₁ ) and the image reflected by the projection screen. is the image of the object in D ₂ received by the observer O ₂ (including the observer O ₂ ).

When the background light L _A1 (which includes the light source directly irradiating the projection screen from the D ₁ side and the light irradiated by other objects in the medium D ₁ (including the observer O ₁ ) and then scattered or reflected to the projection screen) the excited light spectrum light The power is much smaller than the excited light in the background light L _A2 (which includes the light source directly irradiating the projection screen from the _D2 side and the light that is irradiated to other objects in the medium _D2 (including the observer _O2 ) and then scattered or reflected to the projection screen) When the light power of the spectrum is observed by the observer _O2 , the light power of the object in _D2 that is reflected by the projection screen and received by the observer _O2 in the spectrum of the excited light observed by the observer O2 can be much greater than that obtained by passing through the projection screen. Or the optical power of the object in _D1 received by _O2 . In this situation, the observer _O2 can only clearly observe the images and projected images of objects in _D2 that are reflected by the projection screen in the spectrum of the excited light and received by the observer _O2 , but cannot clearly observe The image of the object in D ₁ received by observer O ₂ through the projection screen. For the observer _O1 , the observer _O1 can observe the image of the object in _D2 received by the observer _O1 through the projection screen in the spectrum of the excited light, and project the image. In this way, not only the projected image can be received by the observer _O1 and the observer _O2 at the same time, but also the privacy of the observer _O1 can be protected.

Conversely, if the background light L _A1 (which includes the light source directly irradiating the projection screen from the _D1 side and the light irradiated by other objects in the medium _D1 (including the observer _O1 ) and then scattered or reflected to the projection screen) the excited light Spectrum light power is much greater than the background light L _A2 , including the light source directly irradiating the projection screen from the D ₂ side and the light that irradiates other objects in the medium D ₂ (including the observer O ₂ ) and then scattered or reflected to the projection screen, not only the projected image It can be received by observer _O1 and observer _O2 at the same time, and the privacy of observer _O2 can be protected.

A specific embodiment of FIG. 7H selects the excited light to be visible light including red, green, blue, white, or a color with an expanded color gamut. In this way, the projection screen 707 is suitable for use in projection advertising systems including but not limited to vehicles or buildings.

Referring again to FIG. 7I , it is a schematic diagram of the ninth projection screen 708 of the present invention; the projection screen 708 includes a partially reflective layer 780 for excited light and scattered light, a light emitting layer 730 and a scattering layer 750 . The excited light and scattered light partial reflective layer 780 can not only partially reflect the light of the excited light spectrum, but also partially reflect the scattered light spectrum.

Compared with FIG. 7H , in FIG. 7I , in addition to replacing the excited light partial reflection layer 770 with the excited light and scattered light partial reflection layer 780 , a scattering layer 750 is also added between the light emitting layer 730 and _D2 . Although this restricts the projection of the light beam L _S2 to the projection screen only from the D ₂ side, it makes the projection screen 708 suitable for use with the projection system 300 .

Because the light spectrum of the scattered light is equal to scanning the laser light spectrum projected on the scattering layer 750 , the light energy of the scattered light in the projected light beam L _S1 will also be partly reflected by the excited light and part of the scattered light reflecting layer 780 . For this reason, when determining the optical power of the scattered spectrum in the projection beam L _S1 to form a certain unit area of scattered light energy on the projection screen, the factor of the partial reflection of the laser light must be taken into account, and the increase in the projection beam L _S1 Laser light power belonging to the scattering spectrum.

A specific embodiment of FIG. 7I is to select the excited light and the scattered light to be visible light including red, green, blue, white, or colors with an expanded color gamut.

Referring again to FIG. 7J , it is a schematic diagram of a tenth projection screen 709 of the present invention; the projection screen 709 includes a partially reflective layer 780 for excited light and scattered light, a scattering layer 750 and a light emitting layer 730 .

Compared with FIG. 7I , the scattering layer 750 in FIG. 7J is placed between the light emitting layer 730 and D ₂ , and the modulated laser beam L _S2 is incident from the side of D ₂ . Therefore, before the modulated laser beam L _S2 is incident on the scattering layer 750, it will not be reflected by the part of the reflective layer 780 for the excited light and the scattered light, which can avoid the laser light power belonging to the scattering spectrum in the projected beam L _S1 as shown in Fig. 7I. The problem of reduced efficiency of incident to the scattering layer.

An embodiment of FIG. 7J is to select the excited light and the scattered light to be visible light including red, green, blue, white, or a color with an expanded color gamut.

Referring again to FIG. 7K , it is a schematic diagram of an eleventh projection screen 710 of the present invention; the projection screen 710 includes a light-gathering layer 791 , a part of a light-shielding layer 790 , a light-emitting layer 730 and a scattering layer 750 . The partial light shielding layer 790 includes many light shielding elements 792 and many openings 793 . The light collecting layer 791 includes many light collecting lenses 794 . Projection screen 710 is suitable for use with projection system 300 .

Referring to FIG. 7KA, it is an example diagram of the light-shielding layer 790, the light-shielding element 792 is a black part, and the opening 793 is a white circle in it. One pixel 795 on the projection screen includes one or several openings 793 . Corresponds to the center of the group of openings of the same pixel and should be aligned with the center of the pixel. The pixel 795 shown in FIG. 7KA includes nine openings, but is not limited thereto. The light shielding element 792 covers most of the area of the light shielding layer 790 . The openings 793 are distributed on the light shielding layer 790 . The opening 793 can pass through the incident light, and its cross section can include but not limited to a circle or a square. The light-shielding element 792 completely blocks the light incident on the light-shielding element 792 through reflection or absorption. The light-shielding element 792 faces the surface of the light-emitting layer and can completely absorb the excited light and the scattered light.

If a single laser beam is projected on each position on the projection screen to have partial light penetration to improve the efficiency of laser beam projection, the maximum distance between the openings 793 should be smaller than the cross-sectional diameter of the laser beam.

FIG. 7KB is an example diagram of the light-condensing layer 791; the light-condensing lens 794 is a white circle. The concentrating lens 794 covers most of the area of the concentrating layer 791 so as to collect most of the light of the incident beam. The center position of each condenser lens 794 is aligned with the center position of the respective opening 793 . The condenser lens 794 can focus the light projected thereon, and thus pass through the opening 793 without being blocked by the light shielding element 792 . The material of the light-gathering layer 791 has less absorption and scattering for the light of the wavelength of the excitation light and the scattered light. Therefore, the optical power of the excitation light and the scattered light wavelength in the projected light beam L _S1 can pass through the opening 793 without hindrance.

The light concentrating layer 791 and the light shielding layer 790 can be integrated into one body. In this situation, the opening 793 is filled with the material of the light-concentrating layer 791 . In this way, the interface between the light concentrating layer 791 and the light shielding layer 790 in the opening area can be reduced, thereby increasing the efficiency of the light beam incident on the light emitting layer 730 and the scattering layer 740 .

After the projected light beam passes through the opening 793 and enters the light-emitting layer 730, the light of the wavelength of the excitation light will cause the light-emitting layer to generate excited light. The excited light generated by the light-emitting layer enters the scattering layer 740 together with the light in the projected light beam that does not belong to the wavelength of the exciting light, and is scattered. Since the scattered light is multidirectionally emitted, the excited light and scattered light corresponding to the single opening 793 can form a light spot with a much larger area than the opening on the surface of the projection screen _D2 . Properly designing the curvature of the condenser, the thickness of the light-shielding layer 790 , the thickness of the light-emitting layer, the thickness of the scattering layer, and the distribution of the openings can make the light point groups corresponding to each pixel fill up the pixel as much as possible. In this way, observer O ₂ will observe an image filled with light spots.

In addition, the surface of the light-shielding element 792 facing the light-emitting layer can completely absorb the excited light and the scattered light. In this way, a considerable portion of the light in the ambient light L _A2 including the spectrum of the excited light and the scattered light will be absorbed by the light shielding element 792 . Therefore, the interference of the ambient light L _A2 on the projected image can be reduced, so that the projected image has a higher color contrast.

A specific embodiment of FIG. 7K is to select the excited light and the scattered light to be visible light including red, green, blue, white, or colors with an expanded color gamut.

Referring again to FIG. 7L , it is a schematic diagram of a twelfth projection screen 711 of the present invention; the projection screen 711 includes a display layer 796 and anti-ultraviolet layers 797 located on one or both sides of the display layer. The imaging layer 796 can form an image after being projected by the projection beam, which includes all projection screens described in the present invention. The anti-ultraviolet layer 797 can prevent light of wavelengths in the ultraviolet range from entering the imaging layer 796 through reflection or absorption, and has relatively small absorption and scattering of light of excitation light and scattered light wavelengths that make the imaging layer 796 form an image. In this way, the light energy of the wavelengths of the excitation light and the scattered light in the projected light beam can enter the imaging layer 796 without hindrance. Because the imaging layer 796 may include a light emitting layer 730, a scattering layer 750, an excited light absorbing layer 720A, an excited light absorbing layer 740, an excited light and scattered light absorbing layer 720B, an exciting light reflecting layer 760, and an excited light partially reflecting layer 770. Partial reflection layer for excited light and scattered light 780. Various functional layers such as various anti-reflection layers. The substrates of the above various functional layers may have various chemical substances to achieve light emission, scattering, and selective wavelength absorption , selective wavelength reflection and other functions. Generally speaking, these chemical substances and the optical properties of the substrate components of various functional layers may gradually deteriorate under the irradiation of ultraviolet light, which shortens the service life of the imaging layer 796 . Placing the anti-ultraviolet layer 797 on one side of the imaging layer 796 can block the light energy of the ultraviolet spectrum in the incident ambient light on this side from the imaging layer 796, so as to achieve stable imaging layer 796 properties and prolong its use. purpose of life.

<Example 7>

Referring to FIG. 8 , it is a schematic diagram of the first laser projection system 800 capable of enlarging the display screen of the present invention. The laser projection system 800 includes a laser projector 80 and a projection screen 801 . The laser projector 80 includes a laser optical module 810 , a rotating plane mirror module 820 and a convex mirror 830 .

The structure and working principle of the rotating plane mirror module 820 are the same as those of the rotating plane mirror module 240 , and will not be repeated here.

The projection screen 801 includes a general projectable surface, that is, a general projection screen, including but not limited to the aforementioned projection screen 101, projection screen 201, projection screen 301, projection screen 501, projection screen 700, projection screen 701, projection screen 702 Projection screen 703, projection screen 704, projection screen 705, projection screen 706, projection screen 707, projection screen 708, projection screen 709, projection screen 710, projection screen 711.

The laser optical module 810 projects a laser beam on the rotating plane mirror module 820, and its structure may include and is not limited to the laser optical module 110 as shown in FIG. 1, the laser optical module 270 in FIG. 2, and the laser optical module 370 in FIG. 3, The laser optics module 470 of FIG. 4 and the laser optics module 570 of FIG. 5 .

The modulated laser beam L _M emitted by the laser optics module 810 is reflected by the rotating flat mirror module 820 onto the convex mirror 830 . For example, when the plane mirror module 820 makes the rotation angle of the laser beam on the xz plane θ _URX , and makes the rotation angle of the laser beam on the yz plane θ _URY , the laser beam L _M will be reflected by the rotating plane mirror module 820 to the convex reflection The endpoint N _UR1 on the mirror 830 is then reflected by the convex mirror 830 to the endpoint N _UR2 of the upper right corner of the projection screen 801 . Similarly, when the plane mirror module 820 makes the rotation angles of the laser beam on the x-axis respectively θ _ULX , θ _BRX , and θ _BLX , and makes the rotation angles of the laser beam on the y-axis respectively θ _ULY , θ _BRY , and θ _BLY , the laser beam The light beam L _M will be respectively reflected by the rotating flat mirror module 820 to the endpoints N _UL1 , N _BR1 , N _BL1 on the convex mirror 330, and then reflected by the convex mirror 830 to the endpoints N _UL2 , the uppermost corner of the projection screen 301 respectively. The bottom right corner endpoint N _BR2 , the most bottom left corner endpoint N _BL2 .

增大为

其中

为凸面反射镜830曲面N_U1N_B1上通过N_U1点的法线与通过N_B1点的法线的夹角。因此，在投影幕801与激光投影器80之间的距离D不变的情况下，可使投影影像高度H变大。The reflection of the convex mirror 830 can expand the scanning angle of the laser beam, and increase the height and width of the projected image while the distance D between the projection screen 801 and the laser projector 80 remains unchanged. Referring to FIG. 8 and FIG. 8A, FIG. 8A is a cross-sectional view parallel to the xz plane of the laser projection system 800 of the present invention; the rotating plane mirror module 820 can rotate the laser beam at an angle of θ on the xz plane. Since the incident angle θ _IL is equal to the reflection angle θ _RL , and the incident angle θ _IR is equal to the reflection angle θ _RR , the scanning angle of the laser beam increases from θ to (θ+Δθ) after being reflected by the convex mirror 830, where Δθ is The angle between the normal line passing through the point N _L1 and the normal line passing through the point N _R1 on the curved surface N _L1 N _R1 of the convex mirror 830 . Therefore, when the distance D between the projection screen 801 and the laser projector 80 is constant, the projected image width W can be increased. 8B, which is a cross-sectional side view parallel to the xy plane of the laser projection system 800 of the present invention; the angle at which the laser beam can scan on the yz plane after being reflected by the convex mirror 830 is given by

increased to

in

is the angle between the normal passing through the point N _U1 and the normal passing through the point N _B1 on the curved surface N _U1 N _B1 of the convex mirror 830 . Therefore, when the distance D between the projection screen 801 and the laser projector 80 is constant, the height H of the projected image can be increased.

Placing the convex reflector 830 near the center line of the image to be projected can increase the curvature of the surface of the convex reflector 830, and make the surface curvature symmetrical to the center of the mirror, so as to reduce the volume of the convex reflector 830, which is conducive to reducing the convex reflection. The production cost of the mirror 830. Please refer to FIG. 8C , which is a graph showing the relationship between the convex mirror 830 and the expanded scanning angle when the convex mirror is placed in different positions on the xz (or yz) plane; A, B, and C are three different positions where the convex mirror 830 can be placed, D, E, and F correspond to the leftmost point (or the uppermost point), the center point, and the rightmost point (or the lowermost point) of the image to be projected. ∠ADF, ∠BEF, ∠CFD, ∠DAC, ∠EBC, ∠FCA are all right angles. When the laser beam enters the convex mirror 830 at point A, the maximum angle scanned on this plane is θ _A , and the beam path at the center of the image is AE. When the laser beam is incident on the convex mirror 830 at point B, the maximum angle scanned on this plane is θ _B , and the beam path at the center of the image is BE. When the laser beam is incident on the convex mirror 830 at point C, the maximum angle scanned on this plane is θ _C , and the beam path at the center of the image is CE. When the laser beams with scanning angle θ ₀ before the incident convex mirror 830 are respectively incident on the convex mirror 830 at points A, B, and C, the maximum angles scanned on this plane are θ _A , θ _B , and θ _C respectively, The beam paths in the center of the picture are AE, BE, and CE respectively. It can be seen from the figure that θ _A =θ _C =tan ^-1 (H/L), θ _B =2*tan ^-1 (H/2/L). Since 2*tan ^-1 (H/2/L)>tan ^-1 (H/L), θ _B >θ _A =θ _C . After being reflected by the convex mirror 830 at points A, B, and C, the increased scanning angles are respectively Δθ _A =(θ _A -θ ₀ ), Δθ _B =(θ _B -θ ₀ ), Δθ _C =(θ _C −θ ₀ ), and Δθ _B >Δθ _A =Δθ _C . Because the increased scanning angle corresponds to the maximum included angle of the normal of the convex mirror 830 , it is known that the convex mirror 830 at point B has a larger surface curvature change, corresponding to the smaller convex mirror 830 . In addition, it can be seen from Fig. 8C that ∠DAE>∠EAF, ∠DBE=∠EBF, ∠DCE<∠ECF, so it is known that the surface curvature change of the convex reflector 830 at point B is symmetrical to its reflection central axis BE, while at point A and The surface curvature of the convex mirror 830 at point C varies asymmetrically with respect to its reflection axes AE and CE, respectively. Therefore, placing the convex reflector 830 near the center line of the image to be projected can increase the curvature of the surface of the convex reflector 830, and make the surface curvature symmetrical to the center of the mirror surface, so as to reduce the volume of the convex reflector 830, which is beneficial to lighten the The manufacturing cost of the convex reflector 830 .

<Embodiment 8>

Referring to FIG. 9 , it is a schematic diagram of a second laser projection system 900 that can expand the display screen of the present invention; since the plane mirror can change the traveling direction of the laser beam, and does not change the scanning angle of the laser beam, the convex reflection The mirror 830 and the flat mirror can also greatly reduce the distance between the laser projector and the projection screen, and achieve the purpose of expanding the display screen. Referring to FIG. 9 , a laser projection system 900 capable of enlarging a display image includes a laser projector 90 and a projection screen 901 . The laser projector 90 includes a laser optical module 910 , a rotating plane mirror module 920 , a convex mirror 930 and a plane mirror module 940 . The structure and working principle of the laser optics module 910 , the rotating plane mirror module 920 and the convex mirror 930 are similar to those of the laser optics module 810 , the rotating plane mirror module 820 and the convex mirror 830 , so they are not repeated here. The plane mirror module 940 reflects the modulated laser beam L _M reflected by the convex mirror 930 to the projection screen 901 .

Under the condition that the scanning angle of the laser beam remains unchanged, the longer the beam traveling path between the rotating plane mirror module 920 and the projection screen 901 , the wider and higher the projection image can be. It can be seen from FIG. 9 that although the plane mirror module 940 cannot increase the scanning angle of the laser beam, it can turn the path of the beam. When the z-axis distance D between the projection screen and the laser projector remains unchanged, a rotating plane mirror can be added. The longer the light beam traveling path between the module 920 and the projection screen 901, the higher the height H and the width W of the projected image.

Although the present invention only uses FIG. 8 and FIG. 9 to illustrate the principle of expanding the scanning angle of the convex mirror and the flat mirror in the laser scanning projection system. However, the scope of the present invention is not limited thereto. Any design of a laser scanning projection system that utilizes one or more convex mirrors or flat mirrors to extend the scan angle is within the scope of the present invention.

The above are only preferred embodiments of the present invention, and are only illustrative, not restrictive, of the present invention. Those skilled in the art understand that many changes, modifications, and even equivalent changes can be made within the spirit and scope defined by the claims of the present invention, but all will fall within the protection scope of the present invention.

Claims (99)

1. a laser projection system comprises a projection screen and a laser projector, and this laser projector is that the image signal according to single picture or dynamic menu produces exciting light, and is projected on the transparence projection screen that matches to produce image, wherein again:

Described projection screen, it possesses at least a luminescent substance F to comprise at least one luminescent layer ₁, F ₂..., F _nIt comprises and anyly is subjected to the excitation light irradiation of a certain wavelength coverage and the material of the light that is excited that produces another wavelength coverage of can being excited, and is cross-sectional diameter much smaller than laser beam in the lateral separation that is parallel to the projection screen plane between the particle of each luminescent substance;

Described laser projector comprises a laser light source module, a laser signal changing module, a converging module, a rotating mirror module, a rotating mirror control module and a signal modular converter;

Wherein this signal modular converter is accepted the image signal S of various single picture or dynamic menu _I, and be converted into the signal S that controls laser light source module _LAnd the signal S of rotating mirror module _M, and the light signal of responsible coordination laser signal changing module and rotating mirror module is synchronous;

Wherein this laser light source module comprises at least one group of LASER Light Source emission wavelength lambda respectively _1L, λ _2L..., λ _NLAnd the corresponding excitation wavelength range lambda that falls into the various luminescent substances of luminescent layer _1S, λ _2S..., λ _NSLight beam L _1S, L _2S..., L _NS,, make it to produce λ with various luminescent substances in the difference stimulated luminescence layer _1E, λ _2E..., λ _NEThe light that is excited of wavelength;

Wherein this converging module is with each laser beam L _1S, L _2S..., L _NS(L _IS) converge to same path, same direction, to produce an overall modulation laser beam (L _M) be incident to the rotating mirror module, and formed overall modulation scan laser light beam (L by the rotating mirror module reflects _S) to be projected to projection screen;

This rotating mirror module module wherein in order to rotate an angle (θ) on one first plane, is non-ly rotated an angle with first parallel plane second plane one simultaneously

Wherein this rotating mirror control module is the rotation in order to driven in rotation level crossing module, and accepts the signal (S from the signal modular converter _M) after, be converted to the signal of the control plane mirror module anglec of rotation, make the anglec of rotation of rotating mirror module be subjected to the control of rotating mirror control module and change in time, so that overall modulation scan laser light beam (L _S) all desire to make the position that produces the light that is excited on the scanning projection curtain one by one;

Wherein this laser signal changing module is according to the single picture that is provided by the signal modular converter or the image signal (S of dynamic menu _I), produce drive current (I corresponding to each LASER Light Source _i), with respectively to the laser beam (L of each wavelength _IS) carry out the luminous power modulation.

2. laser projection system according to claim 1, wherein this luminescent substance is to be made of a kind of institute in fluorescent material, phosphorus, laser dye or the laser crystal.

3. laser projection system according to claim 1, wherein this luminescent layer absorbs the energy of most excitation laser light, and reduces visible scattering of light and absorption, so that this luminous stratiform is like transparent.

4. laser projection system according to claim 3, wherein the particle diameter of the luminescent substance of this luminescent layer is less than the minimal wave length of seeing light, so that this luminous stratiform is like transparent.

5. laser projection system according to claim 1, wherein this luminescent layer is to utilize one deck base material, comprising multiple luminescent substance on it and be dispersed in even mode may be the position that exciting light was shone, to produce the required photometric units area luminous energy that is excited.

6. laser projection system according to claim 1, wherein this luminescent layer is to utilize multi-layer substrate, and each layer base material comprises at least a luminescent substance respectively and be dispersed in even mode may be the position that exciting light was shone, to produce the required photometric units area luminous energy that is excited.

7. laser projection system according to claim 1, wherein this luminescent layer is to utilize a substrate to comprise the microparticle of various luminescent substances respectively in order to carrying, wherein each microparticle is to carry different luminescent substances respectively by different base materials, and each microparticle is that to be dispersed in even or uneven distribution density can be the position that exciting light was shone on substrate.

8. laser projection system according to claim 7, wherein each particle between the xsect that is parallel to substrate and each microparticle at the cross-sectional diameter of the lateral separation that is parallel to the projection screen plane much smaller than laser beam.

9. laser projection system according to claim 7, wherein this luminescent layer is that each luminescent substance is dissolved in respectively in the solution out of the ordinary earlier, forms microparticle with ink-jet or evaporation mode respectively again and places on the substrate, substrate is solidified to form again.

10. according to claim 5,6 or 7 described laser projection systems, wherein this base material is to be selected from a kind of in TN, STN, PBT, polynary ester resin, COC, PET, epoxy, the glass.

11. laser projection system according to claim 1, wherein this exciting light should avoid single excitation light generation more than or equal to the optical wavelength that is excited more than two kinds, and must minimizing λ during luminescent substance in selecting optical maser wavelength and luminescent layer _ISWith λ _JSBetween the overlapping of distribution range, wherein 1≤i, j≤n and λ _IE≠ λ _JE, and reduce λ _ISExpose to the luminescent substance in arbitrary luminescent layer and produce any λ of being not equal to _IEThe luminous energy that is excited of wavelength is so that λ that each point produces on the projection screen _1E, λ _2E..., λ _NEThe unit area luminous power of wavelength is respectively exciting light L _1S, L _2S..., L _NSLuminous power control.

12. laser projection system according to claim 1 wherein is to establish the m kind in this luminescent layer, m 〉=2 wherein, and luminescent substance is respectively different wavelength range λ _1mS, λ _2mS..., λ _MmSExciting light excite, and produce same wavelength X _IEThe light that is excited, and in laser light source module m LASER Light Source of configuration, its wavelength is the wavelength coverage of the exciting light of each luminescent substance of correspondence respectively, so that each light beam wavelength X that launching position produces on this luminescent layer _IEThe unit area luminous energy by this m luminescent substance be subjected to this m LASER Light Source excite the be excited summation of light of life.

13. laser projection system according to claim 1, wherein this luminescent layer is the selective excitation light wavelength lambda _ISDistribution range is wide and to produce the optical wavelength that is excited be λ _IELuminescent substance, and in laser light source module, dispose m ₂Individual, m wherein ₂〉=2, LASER Light Source, its wavelength all is positioned at this luminescent substance excitation wavelength lambda _ISIn the scope, so that each light beam wavelength X that launching position produces on this luminescent layer _IEThe unit area luminous energy be subjected to this m for this luminescent substance ₂Individual LASER Light Source excites the summation of the light that is excited of giving birth to.

14. laser projection system according to claim 1, wherein this converging module is made up of various filter plate or water chestnut mirror.

15. laser projection system according to claim 1, wherein this overall modulation scan laser light beam L _SThe scanning form of scanning on projection screen comprises the scanning of grid formula, Li Sa as scanning or vector scan.

16. laser projection system according to claim 1, wherein ought desire to make the unit area luminous energy of i the wavelength that is excited of some positions on the projection screen is P _IEThe time, then at overall modulation scan laser light beam L _SWhen being scanned up to this position, just will correspond to this L of laser beam of this wavelength that is excited _ISLuminous power P _ISAdjust, or the time τ of scanning through certain position on the projection screen adjusted, make it to excite this luminescent substance generation P of this position in the projection screen _IEThe unit area luminous energy, promptly

Wherein, P _IE(x is to excite this position in the projection screen (x, i luminescent substance y) is by light beam L y) _ISExcite the unit area luminous energy of generation; (x y) is the air coordinates of this position;

Be light beam L _ISScanning in the position (x, luminous power y),

P _IS(x is y) for working as light beam L _ISScanning is (x, the luminous power of being launched by laser light source module in the time of y), L in the position _ORepresent light beam L _ISReach the optical power loss parameter that all optical elements are given birth between between laser light source module and projection screen through converging module, the reflection of rotating mirror module; (x y) is overall modulation scan laser light beam L to τ _SScanning is through position (x, time y);

D _i(x, y)) is that (x, y) last i kind luminescent substance is with excitation wavelength λ in the position _ISBe converted to the light wavelength lambda that is excited _IEUnit area luminous power conversion efficiency, it is subjected to

With D _i(x, influence y); D _i(x y) is position (x, y) density of last i luminescent substance;

Wherein, when at i kind luminescent substance

D _i(x, y)) is not subjected to

Under the situation of influence,

D _i(x, y))=C _i(D _i(x, y));

Wherein, (x is to calculate according to the rotary mode of rotating mirror module to get L y) to τ _OWith

D _i(x, y)) gets through measurement, uses through the laser modulating module to change P _IS(x y) is desired the P that reaches to obtain _IE(x, y).

17. laser projection system according to claim 16 wherein is all when equating when the density of the luminescent substance of each position on the projection screen, i.e. D _i(x, y)=D _i, then according to overall modulation scan laser light beam L _S(x, (x y) adjusts P to time τ y) through the position in scanning _IS(x, value y) is so that any position all reaches default unit area luminous energy P on the projection screen _IE

18. laser projection system according to claim 16, wherein when laser scanning methods for grid formula scanning or sharp Sa as scanning, and the density of i luminescent substance of each position is all when equating on the projection screen, then works as and will reach the identical light wavelength lambda that is excited _ISThe unit area luminous energy, its account form is as follows:

During setting-up time t=0, the anglec of rotation of this rotating mirror control module

Then get the following relationship formula:

θ(t)＝θ ₀*sin(2π/T _θ*t)；

Wherein, θ ₀With Be respectively this rotating mirror control module and make the maximum anglec of rotation of laser beam along x axle and the rotation of y axle; T _θWith

Be respectively its swing circle;

Wherein, when this projection screen is a plane, (x, some y)=(0,0) is perpendicular or normal in θ=0,

Laser beam, then the following relationship formula:

X=D*tan (θ (t)) and y=D*tan (θ (t)),

Wherein, D is the bee-line of this rotating mirror control module and projection screen;

Mat above-mentioned relation formula is with must be at the sweep velocity v of x axle _x(x)=the sweep velocity v of dx/dt and y axle _y(y)=dy/dt, and (x, sweep velocity y) be v (x, y)=(v _x ²(x)+v _y ²(y)) ^1/2

Wherein, P _IS(x, y) guarantor is proportional to

Wherein, when at i kind luminescent substance D _i(x, y)) is not subjected to Under the situation of influence, P _IS(x, y) be proportional to v (x, y)=(v _x ²(x)+v _y ²(y)) ^1/2, use making the unit area luminous energy all consistent on projection screen.

19. laser projection system according to claim 16 wherein makes overall modulation scan laser light beam L when the rotational speed of this rotating mirror control module _SScan the image display time shutter of required time of each position of process projection screen less than the observer, this laser beam scanning will form a picture through each luminous point of formation that each position excites, wherein observer's the image display time shutter is human eye retentivity time of eye (about 1/16 second) for human eye, is time shutter of each picture for camera or video camera.

20. laser projection system according to claim 16, the image display time shutter that wherein surpasses the observer when the time that this rotating mirror control module continues to rotate, this laser beam scanning will form several pictures through each luminous point of formation that each position excites, wherein be enough to make update time of each picture less than image display time shutter of observer when the speed of this rotating mirror control module rotation, then these several pictures will be the continuous dynamic picture for observer's cognition.

21. laser projection system according to claim 20, wherein when desire formed the continuous dynamic picture, this laser projection system should select to alleviate the short luminescent substance of process time, as fluorescent material, laser dye, laser crystal etc.

22. laser projection system according to claim 16, wherein when this laser projection system be that a single primary colors is α-bit, promptly 2 ^αThe full-color laser projection imaging system of layer color range, and correspond to the red, green, blue look at the color that projection screen position desire shows and be respectively n _R, n _R, n _RDuring individual color range, mat is adjusted laser beam L _RS, L _GS, L _BSScanning is through the luminous power P of this position _RL, P _GL, P _BL, respectively be (n so that the luminescent layer of this projection screen produces red, green, blue color unit area luminous power respectively _R-1)/(2 ^α-1) * P _REM, (n _G-1)/(2 ^α-1) P _GEM, (n _B-1)/(2 ^α-1) P _BEM, wherein, P _REM, P _GEM, P _BEMBe respectively the maximum unit area luminous power of red, green, blue three coloured light, and this P _REM, P _GEM, P _BEMRelative scale should meet the ratio of reaching the image frame white balance.

23. laser projection system according to claim 22, wherein, by adjusting laser beam L _RS, L _GS, L _BSScanning is through the luminous power P of this position _RL, P _GL, P _BL, be [(n so that the luminescent layer of this projection screen produces red, green, blue color unit area luminous power respectively _R-1)/(2 ^α-1)] ^{1/ γ}P _REM, [(n _G-1)/(2 ^α-1)] ^{1/ γ}P _GEM, [(n _B-1)/(2 ^α-1)] ^{1/ γ}P _BEM, wherein γ is for having the gamma correction factor of sharp perception at human eye to the less light of seeing of luminous power.

24. laser projection system according to claim 22, wherein on the projection screen every position be respectively n for same red, green, blue look _R, n _R, n _RWhen all showing same lightness, form and aspect and colourity during individual color range, this laser beam L _RS, L _GS, L _BSMaximum luminous power P _RLM, P _GLM, P _BLMBe that the distribution density of the various luminescent substances by each position on the projection screen and the sweep velocity of laser beam are adjusted.

25. laser projection system according to claim 1, wherein the luminescent layer of this projection screen further adds w kind wide spectrum luminescent substance, w 〉=1 wherein, this wide spectrum luminescent substance generation wavelength X that is excited _1WE, λ _2WE..., λ _WWE, and λ _IWEContain the not only light of a primitive color light wavelength, wherein 1≤i≤w; And in laser light source module the configuration w LASER Light Source, its wavelength X _1WS, λ _2WS..., λ _WWS, lay respectively in the excitation wavelength range of this w kind luminescent substance.

26. laser projection system according to claim 25, wherein, the mutual ratio between the luminous power of the w kind laser of this w LASER Light Source is inspired broadband wavelength λ for making this w kind wide spectrum luminescent substance _1WE, λ _2WE..., λ _WWEThe summation of luminous energy meet the requirement of white balance on the color science.

27. laser projection system according to claim 1, wherein, the luminescent layer of this projection screen further adds the g kind and enlarges colour gamut luminescent substance, wherein g 〉=1; This expansion colour gamut luminescent substance generation wavelength X that can be excited _1GE, λ _2GE..., λ _GGE, and on cie color coordinate figure, this λ _1GE, λ _2GE..., λ _GGEAnd λ _RE, λ _GE, λ _BEThe formed area of (g+3) individual wavelength is greater than having only λ altogether _RE, λ _GE, λ _BEFormed area; And in laser light source module an addition g LASER Light Source, its wavelength lays respectively at this g kind and enlarges in the excitation wavelength range of colour gamut luminescent substance.

28. laser projection system according to claim 1, wherein this exciting light is to adopt to lose the LASER Light Source of the laser of light wavelength as laser light source module.

29. laser projection system according to claim 28, wherein this exciting light is to comprise wavelength to be about the LASER Light Source of the laser of 808nm, 850nm, 980nm or 1064nm as laser light source module.

30. laser projection system according to claim 1, wherein this exciting light is to adopt the laser of the relatively poor wavelength of the human eye light sensitivity LASER Light Source as laser light source module.

31. laser projection system according to claim 30, wherein this exciting light is to comprise the laser of wavelength of 405nm or 780nm as the LASER Light Source of laser light source module.

32. laser projection system according to claim 1, wherein this exciting light is to adopt the LASER Light Source of the laser of about 405nm bluish violet of wavelength or 450nm blueness as laser light source module, in order to the image of the about 450nm of stimulated luminescence layer generation blue wavelength, use minimizing and mix phenomenon because of the color that exciting light is given birth to by projection screen reflection or scattering.

33. laser projection system according to claim 1, wherein this exciting light is to adopt the LASER Light Source of the laser of about 780nm redness of wavelength or 640nm redness as laser light source module, in order to the image of the about 640nm of stimulated luminescence layer generation red wavelength, use minimizing and mix phenomenon because of the color that exciting light is given birth to by projection screen reflection or scattering.

34. laser projection system according to claim 1, wherein this exciting light is to adopt the LASER Light Source of a 405nm semiconductor laser as laser light source module, and use the mems mirror of a two dimension rotation or the mems mirror of two one dimension rotations to be combined to form a rotating mirror module, and make and comprise one in the luminescent layer of a projection screen and can be excited the luminescent substance that produces red, blue or green visible light by the 405nm wavelength.

35. according to claim 1 to the 34 each described laser projection systems, wherein this projection screen is on the windshield that fits in before the driver's seat of the vehicles, and this laser projector is installed in these vehicles so that laser beam is incident upon on this projection screen, and the signal modular converter of this laser projector is that the wired or wireless mode of mat receives from following image source element cohort: computer, mobile phone, GPS, night-vision camera or see the image signal of one in the light video camera, on projection screen, to manifest various information, comprise and be not limited to the speed of a motor vehicle, mileage, oil consumption, map, warning, the direction indication, the cell phone incoming call number.

36. laser projection system according to claim 1, wherein this laser light source module further comprises a first kind laser light source module and one second class laser light source module, and the transparence projection screen that matches is to comprise a luminescent layer and a scattering layer, and luminescent layer before scattering layer with in the face of the light beam of scanning that laser projector is throwed; Wherein this first kind laser light source module comprises at least one group of LASER Light Source emission wavelength (λ respectively _I1L) corresponding and fall into the excitation wavelength scope (λ of the various luminescent substances of this luminescent layer _IS) the laser light of first kind wavelength to excite various luminescent substances in this luminescent layer respectively, make it to produce respectively wavelength (λ _IE) the light that is excited; Wherein this second class laser light source module comprises at least one group of LASER Light Source emission wavelength (λ respectively _I2L) the laser of the second class wavelength; Wherein this luminescent layer is that the absorption and the scattering of laser light of the second class wavelength that the second class laser light source module is launched is extremely low, so that the laser light of most of second class wavelength passes through this luminescent layer and enter scattering layer, and absorb the laser light that most of first kind laser light source module is launched first kind wavelength; Wherein this scattering layer is in order to the laser light of the scattering second class wavelength and the light that is excited that is excited by first kind wavelength laser light in this luminescent layer.

37. laser projection system according to claim 36, wherein this luminescent layer is to be provided with one deck anti-reflecting layer at least in the face of the interface of scanning light beam that laser projector throws, to reduce the reflection of light that first and second class wavelength laser light and luminescent layer be excited at this interface, the ratio that the laser light that using increases first kind wavelength enters luminescent layer, the laser light that increases by the second class wavelength enters the ratio of the chromatograph that looses, increase enters extraneous ratio by the light that is excited that luminescent layer produces by this interface, and the light that increases by the scattering of scattering layer institute enters extraneous ratio by this interface, be excited light and the image brilliance that is scattered light that make the observer that is positioned at this interface front side of projection screen observe higherly.

38. laser projection system according to claim 36, wherein the interface of this luminescent layer and scattering layer is provided with one deck anti-reflecting layer at least at the laser light of the second class wavelength, use the laser light that increases by the second class wavelength and enter scattering layer and the ratio that light by the scattering of scattering layer institute enters the luminescent layer external world, the image brilliance that is scattered light that makes the observer that is positioned at this luminescent layer external world of projection screen observe higherly.

39. laser projection system according to claim 36, wherein the laser light of the interface pin first kind wavelength of this luminescent layer and scattering layer is provided with at least one high reflection layer, the laser light of using reflection first kind wavelength is by the residual amount of energy behind the luminescent layer, what make gets back to luminescent layer with the be excited luminous power of light of increase, the image brilliance that is scattered light that makes the observer that is positioned at this luminescent layer external world of projection screen observe higherly.

40. laser projection system according to claim 36, wherein the laser light of this first kind wavelength is to adopt wavelength to be about the LASER Light Source of the laser of 808nm, 850nm, 980nm or 1064nm as first kind laser light source module.

41. laser projection system according to claim 36, wherein the laser light of this first kind wavelength is to adopt wavelength to be about the LASER Light Source of the laser of 405nm or 780nm as first kind laser light source module.

42. laser projection system according to claim 36, wherein the laser light of this first kind wavelength is to adopt the LASER Light Source of the laser of about 405nm of wavelength (bluish violet) or 450nm (blueness) wavelength as first kind laser light source module, in order to the image of the about 450nm of stimulated luminescence layer generation blue wavelength, use minimizing and mix phenomenon because of the color that exciting light is given birth to by projection screen reflection or scattering.

43. laser projection system according to claim 36, it further makes certain the second class laser optical power that is scanned up to certain position on the projection screen, be multiplied by the time of this laser beam scanning through this position, the value that is multiplied by the scattering efficiency of this position again becomes one and the fixed ratio of screen location independent with unit area luminous energy at this second class laser light wavelength of this position.

44. laser projection system according to claim 36 is characterized in that, it is a full-color laser projection imaging system, adds the g kind in the luminescent layer of this projection screen and enlarges colour gamut luminescent substance, wherein g 〉=1; And in first kind laser light source module, increasing g LASER Light Source of configuration, its wavelength lays respectively at this g kind and enlarges in the excitation wavelength range of colour gamut luminescent substance.

45. according to the described laser projection system of claim 44, wherein this second class laser light source module increases h LASER Light Source of configuration, produces λ respectively _1HE, λ _2HE..., λ _HHEWavelength, h 〉=1 wherein; And on cie color coordinate figure, this λ _1HE, λ _2HE..., λ _HHEAnd λ _RE, λ _GE, λ _BEThe formed area of (h+3) individual wavelength is greater than having only λ altogether _RE, λ _GE, λ _BEFormed area, and the signal modular converter is with image signal S _IBe converted to λ _RE, λ _GE, λ _BEAdd λ _1GE, λ _2GE..., λ _GGEAnd λ _1HE, λ _2HE..., λ _HHEThe image information, and in order to control laser beam L _RS, L _GS, L _BSThe laser optical power of g kind first kind laser light source module and this h kind second class laser light source module therewith is truly to present the color of the position that laser beam is scanned up on the projection screen.

46. according to the described laser projection system of claim 44, the λ that is given birth on this projection screen wherein _RE, λ _GE, λ _BAnd λ _1GE, λ _2GE..., λ _GGEAnd λ _1HE, λ _2HE..., λ _HHE(3+g+h) plants wavelength altogether, luminous energy, g wherein, h 〉=0, and the laser light that can be respectively the generation of first kind laser light source module excites, or be that the laser light scattering that the second class laser light source module produces is given birth to, and comprising at least a luminescent substance was excited and produced some wavelength in this (3+g+h) kind wavelength respectively by the LASER Light Source of first kind laser light source module light in the luminescent layer, the second class laser light source module then comprises the light that this (3+g+h) plants other wavelength in the wavelength.

47. laser projection system according to claim 36, wherein the laser light of this first kind wavelength is to adopt blueness and the LASER Light Source of red laser as first kind laser light source module, and uses the laser light of the about 405nm of wavelength, 980nm or 1064nm to excite a kind of luminescent substance in this luminescent layer and produce green image.

48. laser projection system according to claim 1, wherein the luminescent layer of this projection screen is separated the screen resolution that shows with corresponding desire for several picture elements.

49. according to the described laser projection system of claim 48, wherein comprise red, blue, green three kinds of sub picture elements in this each single picture element, and the area of each sub picture element is not necessarily equal, and the sub picture element between contiguous picture element is arranged as identical or different.

50. according to the described laser projection system of claim 49, wherein these three kinds of sub picture elements respectively are distributed with each other luminescent substance, and comprise its emission wavelength of at least one group of LASER Light Source (λ in the laser light source module in this laser projection system _L) fall into three kinds of sub picture elements of this luminescent layer simultaneously and have laser beam (L in the excitation wavelength scope of three kinds of luminescent substances _L).

51. according to the described laser projection system of claim 50, wherein the minimum length of this each sub picture element is greater than laser beam (L _L) diameter of section, and make between each sub picture element at regular intervals, to avoid laser beam (L _L) shine two or more sub picture elements simultaneously.

52. according to the described laser projection system of claim 51, wherein the scanning pattern of this laser beam be with projection screen on the arrangement of sub picture element do contraposition, to avoid laser beam to shine two or more sub picture elements simultaneously, or be scanned up in laser light and be mapped to two or morely can be by the sub picture element of this laser excitation third contact of a total solar or lunar eclipse the time simultaneously, close this laser.

53. according to the described laser projection system of claim 48, wherein further comprise red, blue, green, Bai Si kind sub picture element in this each single picture element, and the area of each sub picture element equates or is unequal, and the sub picture element between contiguous picture element is arranged as identical or different.

54., wherein further comprise sub picture element red, blue, green, that bletilla g kind enlarges colour gamut in this each single picture element, wherein g 〉=1 according to the described laser projection system of claim 48.

55. laser projection system according to claim 1, it further is provided with the luminescent substance (F of high distribution density on this projection screen one position _i), so that this position produces the wavelength (λ of higher unit area luminous energy _IE) light.

56. according to the described laser projection system of claim 55, wherein this luminescent layer is by various luminescent substance (F _i) distribution density of each position decides the static image that institute's desire forms on the projection screen on this projection screen.

57. according to the described laser projection system of claim 56, wherein as luminescent substance F _iEach position has same density on projection screen, and all produces wavelength X _IESame unit area luminous energy the time, then make laser beam scan that each position all provides same unit area exciting light energy on projection screen, and make laser beam be scanned up to (x, y) the luminous power P of position _L(x, y) be proportional to this position sweep velocity v (x, y), i.e. synchronous in order to the anglec of rotation of the luminous power of coordinating LASER Light Source and this rotating mirror control module of this signal Coordination module this moment; Wherein as light beam L _LSame luminous power is all arranged, and the anglec of rotation of the luminous power of LASER Light Source and rotating mirror control module is synchro control in scanning process, then by this luminescent substance F _iOn projection screen the Density Distribution of each position be proportional to laser beam be scanned up to (x, y) the sweep velocity v of position (x, y) so that each position all produces wavelength X on the projection screen _IESame unit area luminous energy.

58. according to the described laser projection system of claim 56, wherein the laser projector in this laser projection system is to utilize a wide frequency light source or narrow frequency light source to constitute as projection light source.

59. according to the described laser projection system of claim 58, wherein projection light source is to be light source with fluorescent tube or bulb, wherein this fluorescent tube comprises and excites the luminescent substance in the projection screen and produce red, green, blue, white or enlarge the color of colour gamut.

60. laser projection system according to claim 1, wherein this projection screen comprises be excited a light absorbing zone and a luminescent layer, wherein this light absorbing zone that is excited is the light that is excited that absorbs by this luminescent layer emission, enter the light that is excited of this outer interface side of light absorbing zone that is excited with minimizing, make observer or optical receiver only outside this luminescent layer the interface side see show image or detect the light that is excited of luminescent layer, and outside this is excited light absorbing zone the interface side can't see show image or detect the light that is excited of luminescent layer.

61. according to the described laser projection system of claim 60, wherein this light absorbing zone that is excited is high to the absorption of visible light, so that projection screen is complete opaque black.

62. according to the described laser projection system of claim 60, wherein, the exciting light that comprises one or more wavelength by this projecting beam that is excited outer interface side of light absorbing zone or outer this projection screen of interface side incident of this luminescent layer, with the various luminescent substances in the difference stimulated luminescence layer, and make projection screen produce image, wherein this light absorbing zone that is excited is to projecting beam L _SExcitation wavelength lower absorption and scattering are arranged.

63. according to the described laser projection system of claim 60, wherein interface and this interface that is excited between light absorbing zone and luminescent layer are to make to have anti-reflex treated outside this light absorbing zone that is excited, and belong to the reflection of spectral light at this two interface that be excited to reduce.

64. according to the described laser projection system of claim 60, wherein interface and this interface that is excited between light absorbing zone and luminescent layer are provided with at least one anti-reflecting layer outside this light absorbing zone that is excited, to reduce by the reflection of the projecting beam of the outer interface side incident of this luminescent layer, to increase the luminous efficacy of this projection screen at this two interface.

65. according to the described laser projection system of claim 60, wherein interface and the interface between light absorbing zone and luminescent layer of being excited are to make to have anti-reflex treated outside this luminescent layer, belong to the reflection of spectral light at this two interface that be excited to reduce.

66. according to the described laser projection system of claim 60, wherein interface and the interface that is excited between light absorbing zone and luminescent layer are provided with at least one anti-reflecting layer outside this luminescent layer, belong to the reflection of spectral light at this two interface that be excited to reduce.

67. according to the described laser projection system of claim 60, wherein this light that is excited be comprise red, green, blue, white or enlarge colour gamut color see light.

68. laser projection system according to claim 1, wherein this projection screen comprises the light absorbing zone that is excited in regular turn, one luminescent layer and a stimulating light absorbing layer, wherein Tou She light beam is to be projected to this projection screen by interface side outside this light absorbing zone that is excited, and this stimulating light absorbing layer is the light that absorbs in the projecting beam in order to the wavelength of stimulated luminescence layer, and the light that is excited there are less absorption and scattering, so that the light that is excited that luminescent layer produced is not transmitted to the outer interface side of this stimulating light absorbing layer with hindering and received by the observer, and prevent this stimulating light absorbing layer outward the environmental background light of interface side can not make luminescent layer produce any image.

69. according to the described laser projection system of claim 68, wherein this light that is excited be comprise red, green, blue, white or enlarge colour gamut color see light.

70. laser projection system according to claim 1, wherein this projection screen comprises be excited light and scattered light absorption layer, a scattering layer and a luminescent layer in regular turn, wherein projecting beam is to be projected to this projection screen by interface side outside this luminescent layer, wherein this scattering layer destroys the single direction of incident laser light, and produce the in many ways property scattered light identical with the incident laser optical wavelength, wherein this be excited light and scattered light absorption layer absorb be excited spectral light also absorption be scattered the light of frequency spectrum.

71. according to the described laser projection system of claim 70, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

72. laser projection system according to claim 1, wherein this projection screen comprises a luminescent layer and an exciting light reflection horizon, wherein this exciting light reflective layer reflects projecting beam is by the residual amount of energy behind the luminescent layer, make it return luminescent layer and excite wherein luminescent substance again, use the luminescence efficiency that improves projection screen, and avoid projecting beam to pass through projection screen entering interface side outside this exciting light reflection horizon and received by the observer, and this exciting light reflection horizon is extremely low to the absorption and the scattering of the light that is excited, and the light that is excited is not hindered enter interface side outside this exciting light reflection horizon.

73. according to the described laser projection system of claim 72, wherein the interface in this luminescent layer and exciting light reflection horizon is treated, comprise and be not limited to select the optical index in close luminescent layer and exciting light reflection horizon, or insert the anti-reflecting layer of one deck at the light that is excited, to reduce the reflection of light that luminescent layer is excited at this interface.

74. according to the described laser projection system of claim 72, wherein outside this luminescent layer outside interface and the exciting light reflection horizon interface be to give anti-reflex treated, comprise and be not limited to insert one deck anti-reflecting layer, to reduce the reflection of light that luminescent layer is excited at this two interface.

75. according to the described laser projection system of claim 72, wherein this luminescent layer and exciting light reflection horizon are extremely low to the absorption and the scattering of visible light, so that projection screen is transparence.

76. according to the described laser projection system of claim 72, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut.

77. according to the described laser projection system of claim 76, its further outside this exciting light reflection horizon the interface side establish a scattering layer.

78. according to the described laser projection system of claim 77, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

79. laser projection system according to claim 1, wherein this projection screen comprises the light absorbing zone that is excited in regular turn, one luminescent layer, an one exciting light reflection horizon and a scattering layer, increasing the luminescence efficiency of this luminescent layer, and make luminous power by the projecting beam of the outer interface side projection of this light absorbing zone that is excited can not enter the outer interface side of this scattering layer and received by the observer.

80. according to the described laser projection system of claim 79, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

81. laser projection system according to claim 1, wherein this projection screen comprises the light absorbing zone that is excited in regular turn, one scattering layer, an one exciting light reflection horizon and a luminescent layer, use the luminescence efficiency that increases this luminescent layer, wherein projecting beam is to be projected to this projection screen by interface side outside this luminescent layer.

82. 1 described laser projection system according to Claim 8, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

83. laser projection system according to claim 1, wherein this projection screen comprises be excited a light partially reflecting layer and a luminescent layer, no matter wherein this light partially reflecting layer that is excited makes the light that is excited by arbitrary interface incident penetrate with a proportional parts, and all the other proportional parts reflections, and exciting light there is the quite high ratio that penetrates, wherein when projection screen first outside the bias light of interface side less than relative second outside during the bias light of interface side, the observer that projection image on this projection screen can be two outer interface sides receives simultaneously, and the observer of the second outer interface side can't observe the observer of the first outer interface side but the observer of the first outer interface side can be observed the second outer interface side.

84. 3 described laser projection systems according to Claim 8, wherein this light that is excited be comprise red, green, blue, white or enlarge colour gamut color see light.

85. laser projection system according to claim 1, wherein this projection screen comprise in regular turn one be excited light be scattered the light partially reflecting layer, one luminescent layer and a scattering layer, wherein this light that is excited is to be scattered the light of frequency spectrum in order to be excited spectral light and partial reflection of partial reflection with being scattered the light partially reflecting layer.

86. 5 described laser projection systems according to Claim 8, wherein when decision by be excited light be scattered the luminous power that belongs to the scattering frequency spectrum in the projecting beam of interface side incident outside the light partially reflecting layer when forming certain unit area scattered energy at projection screen, must strengthen the laser optical power that belongs to the scattering frequency spectrum in this projecting beam with compensation be excited light and the energy that is scattered the reflection of light partially reflecting layer part.

87. 5 described laser projection systems according to Claim 8, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

88. laser projection system according to claim 1, wherein this projection screen comprise in regular turn one be excited light be scattered light partially reflecting layer, a scattering layer and a luminescent layer.When projecting beam by luminescent layer outside during the incident of interface side, this laser beam this scattering layer of incident preceding not can by be excited light be scattered the light partially reflecting layer and reflected.

89. 8 described laser projection systems according to Claim 8, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

90. laser projection system according to claim 1, wherein this projection screen comprises a light collecting layer in regular turn, part light shield layer, one luminescent layer and a scattering layer, wherein this part light shield layer comprises a plurality of shading elements and a plurality of opening, wherein this light collecting layer comprises a plurality of condensers, and wherein the zone of each picture element comprises at least one opening on the projection screen, and correspond to same picture element these openings positive center should with the positive center-aligned of this picture element.

91. according to the described laser projection system of claim 90, wherein this condenser is to contain the most of area of light collecting layer being collected into the most light of irradiating light beam, and the light that is projected on it is focused on and passes through opening.

92. according to the described laser projection system of claim 90, wherein the maximum spacing of this opening is the cross-sectional diameter less than laser beam, so that each position all can have part light to penetrate on the single laser beam projection projection screen, to promote the service efficiency of laser beam projection.

93. according to the described laser projection system of claim 90, wherein this light collecting layer and light shield layer are to be integrated.

94. according to the described laser projection system of claim 90, wherein this opening is filled up by the material of light collecting layer.

95. according to the described laser projection system of claim 90, wherein this light that is excited is to comprise red, green, blue, white or enlarge the visible light of the color of colour gamut with being scattered light.

96. laser projection system according to claim 1, wherein a uvioresistant layer is further established in the one or both sides of this projection screen, use stable projection curtain characteristic and with prolong its serviceable life.

97. laser projection system according to claim 1, wherein this laser projector further comprises at least one convex reflecting mirror and is located between the rotating mirror module and projection screen in the laser projector, so that the laser beam that laser projector produced reflexes on the convex reflecting mirror earlier through the rotating mirror module, be projeced on the projection screen again, make the reflection that sees through convex reflecting mirror with expansion of laser light beam flying angle, under the constant situation of the distance between projection screen and laser projector, to increase the height and the width of projection image.

98. according to the described laser projection system of claim 97, wherein this convex reflecting mirror is to be located near the center line of desiring projected picture or the most left point of projected picture or go up the rightest point of point or projected picture most or descend point most.

99. according to the described laser projection system of claim 97, wherein this laser projector further comprises at least one plane mirror module and is located between this convex reflecting mirror and the projection screen, so that the laser beam that laser projector produced reflexes on the convex reflecting mirror earlier through the rotating mirror module, again through the reflection of this plane mirror module and be projeced into again on the projection screen, make reflection through this plane mirror module with expansion of laser light beam flying angle.

Images