CN102854724B - Adjustment method and device of projection light source - Google Patents

Abstract

The invention discloses an adjustment method and device of a projection light source of a projection system. The projection system comprises a projection light source, a light modulation unit and a projection lens, wherein the emergent light of the projection light source is emitted into the light modulation unit and modulated and emitted out to the projection lens. The adjustment method of the projection light source comprises the following steps of: obtaining first brightness ai of a plurality of prepositions of emergent light facula of the projection light source, obtaining second brightness bi of a plurality of prepositions of the emergent light facula of the projection light source; obtaining expected brightness pi of positions on the projection area corresponding to the plurality of prepositions of the emergent light facula of the projection light source; through a formula ci=pi*ai/bi, obtaining third brightness ci of a plurality of prepositions of the emergent light facula of the projection light source required by the expected brightness on the projection area: adjusting the projection light source so as to make the brightness of the plurality of prepositions of the emergent light facula of the projection source to be ci. The adjustment method of a projection light source disclosed by the embodiment of the invention can obtain a projection area with expected brightness distribution.

Description

Method and device for adjusting projection light source

technical field

The invention relates to the technical field of illumination and display, in particular to a projection light source adjustment method and an adjustment device of a projection system.

Background technique

In order to project an image with uniform brightness on the screen, the existing projection system often installs a uniform light device in the optical path to uniform the light emitted by the projection light source, and then uses a light modulation unit such as a DMD to modulate it and then enters the projection lens. Commonly used dodging devices include dodging rods, fly-eye lenses, etc. Fig. 1 is a schematic structural view of a projection system in the prior art. As shown in Fig. 1, the projection system 100 includes a projection light source 110, a lens 120, a homogenizing rod 130, a lens 140, a total internal reflection prism 150, and a light modulation unit 160 , the projection lens 170, wherein the projection light source 110 includes an excitation light source 111 and a fluorescent pink wheel 112, and the excitation light source excites the fluorescent pink wheel to generate the received light and emits it. The homogenizing rod 130 receives the outgoing light of the projection light source 110 , homogenizes it and then enters the light modulation unit 160 through the lens 140 and the total internal reflection prism 150 . The light modulation unit 160 is a DMD, which modulates the incident light and emits it to the projection lens 170 . However, the projection image projected by the projection lens 170 may have a vignetting phenomenon, that is, the projection image has a high brightness in the middle and a low brightness in the edge, and thus presents a phenomenon of uneven brightness.

Contents of the invention

The technical problem mainly solved by the present invention is to provide an adjustment method and an adjustment device for a projection light source, so as to obtain a projection area with a desired brightness distribution.

A method for adjusting a projection light source of a projection system, characterized in that the projection system includes a projection light source, a light modulation unit, and a projection lens, and the outgoing light of the projection light source is incident on the light modulation unit, and is modulated by the light modulation unit before being emitted to the projection The lens is finally projected to the projection area through the projection lens; the adjustment method of the projection light source includes:

Obtain the first brightness a _i of several predetermined positions of the outgoing light spot of the projection light source;

Obtaining the second brightness b _i of corresponding positions of several predetermined positions of the outgoing light spot on the projection area;

Obtain the expected brightness p _i of the corresponding positions of several predetermined positions of the outgoing light spot on the projection area;

The third luminance c _i of several predetermined positions of the outgoing light spot of the projection light source required to obtain the desired luminance on the projection area is obtained by the following formula:

Where i is an integer greater than or equal to 1;

The projection light source is adjusted so that the brightness of several predetermined positions of the light spot emitted by the projection light source is the third brightness c _i .

The present invention also provides an adjustment device, comprising

Compared with the prior art, the present invention includes the following beneficial effects:

In the present invention, by obtaining the first luminance a _i of several predetermined positions of the outgoing light spot of the projection light source, and obtaining the second luminance b _i of the corresponding positions of the several predetermined positions of the outgoing light spot on the projection area, the number of outgoing light spots is obtained. The expected brightness p _i of the corresponding position of the predetermined position on the projection area is finally passed by the formula Obtain the third luminance c _i at several predetermined positions of the exit light spot of the projection light source required to obtain the desired luminance on the projection area, so that the projection area can obtain the desired luminance distribution when the projection light source is adjusted.

Description of drawings

Fig. 1 is a schematic structural diagram of a projection system in the prior art;

Figure 2a is a schematic structural view of an embodiment of the projection system of the present invention;

Fig. 2b is a schematic flowchart of a method for adjusting the projection light source of the projection system shown in Fig. 2a;

Fig. 2c is a schematic diagram of the measurement position of the light spot emitted by the projection light source;

Fig. 2d is a schematic diagram of the brightness measurement position of the projection area corresponding to the light spot emitted by the projection light source in Fig. 2c;

Fig. 3a is a schematic structural diagram of another embodiment of the projection system of the present invention;

Fig. 3b is a schematic flowchart of a method for adjusting the projection light source of the projection system shown in Fig. 3a;

Fig. 3c is a schematic structural diagram of the adjusted projection light source of the projection system shown in Fig. 3a;

Fig. 3d is another structural schematic diagram of the adjusted projection light source of the projection system shown in Fig. 3a;

Fig. 4 is a schematic diagram of an embodiment of the projection light source adjusting device of the present invention.

Detailed ways

Embodiments of the present invention will be described in detail below with reference to the drawings and implementation methods.

Embodiment one

2a is a schematic structural diagram of an embodiment of the projection system of the present invention. As shown in FIG. The projection light source 210 is specifically an LED array. The outgoing light of the projection light source 210 is adjusted by the lens 220 and enters the total internal reflection prism 240, then enters the light modulation unit 230 for modulation, and finally exits the total reflection lens 240 to the projection lens 250, and finally passes through the projection The lens 250 projects onto a projection area on the screen.

In addition, the lens 220 adjusts the angle of the light emitted by the projection light source 210 , and the lens 220 does not need to be provided when the light utilization rate is not high or the light emitted by the projection light source 210 does not need to be adjusted. The total internal reflection prism 240 is used to separate the optical path of the incident light and the outgoing light of the light modulation unit 230 , and its advantage is that compared with a reflective mirror, multiple images will not be generated to affect the projection effect. Of course, the light modulation unit 230 can also be used to directly receive the incident light of the projection light source 210 and reflect it to the projection lens 250 , omitting the total internal reflection prism 240 .

During the working process of the projection system, the light emitted by the projection light source 210 is incident on the surface of the light modulation unit 230 to form a light spot and is modulated by it. When the adjustment effect of the unit 230 on each position on the light spot is the same, the modulation by the light modulation unit 230 will not change the energy distribution of the light spot. The output light of the light modulation unit 230 will be projected onto the projection area of the projection screen after passing through the projection lens 250, and the position on the projection area corresponds to the position of the light spot incident on the projection lens 250, that is, the position on the light spot emitted by the light modulation unit 230. , so the position on the projection area is also in one-to-one correspondence with the position on the spot of light emitted by the projection light source 210 . Due to the size limitation of the projection lens 250, the light transmission transmittance _Ni of each part of the projection lens 250 is not completely the same: the light transmission transmittance of the middle area is higher than that of the edge area, resulting in uniform brightness The brightness of the projected area after it is incident on the projection lens 250 is bright in the middle and dark at the edge. However, for any fixed position of the projection lens 250, the light transmission transmittance is fixed, that is, the brightness of the incident light at any fixed position of the projection lens 250 is larger, and after it is transmitted through the projection lens 250, it is projected to a certain portion of the projection area. The brightness of a position is greater. Similarly, other optical elements between the projection light source and the projection lens, such as lenses, dodging rods, etc., will affect the propagation of the light beam, making the transmission effect of each part of the light spot incident on the surface of the optical element different. Here, we can regard all the optical elements including the projection lens 250 as an optical element. The light transmission transmittance of each position of the optical element is different, but the light transmittance of each position is a fixed value, and does not vary with the output of the projection light source. The energy distribution of the spot changes.

On the other hand, the adjustment of the light modulation unit 230 does not change the energy distribution of the incident light spot. Therefore, for a certain fixed position B _i in the projection area, its brightness b _i is determined by the light spot of the emitted light of the projection light source 210 corresponding to the position. The brightness a _i at the position A _i and the overall light transmission transmittance N _i of all optical elements between the projection lens 250 and the projection light source 210 satisfy b _i =a _i ×N _i . Therefore, to obtain a projection area with a desired brightness distribution, it is only necessary to adjust the brightness of the position on the light spot of the projection light source 210 corresponding to the position with a lower brightness in the projection area.

Fig. 2b is a schematic flowchart of a method for adjusting the projection light source of the projection system shown in Fig. 2a. As shown in Fig. 2b, this embodiment includes:

Step S21, acquiring the first luminance a _i of several predetermined positions of the emitted light spot of the projection light source;

Here, the method for obtaining the first luminance a _i of several predetermined positions of the emitted light spot of the projection light source may be: using a camera or other device to image the emitted light spot of the projected light source on the photosensitive film, and obtaining the first brightness a i of several predetermined positions from the photosensitive film. - Brightness a _i . Of course, other ways can be used to obtain the first brightness of several positions, such as using a aperture with a hole to cover other positions, aligning the hole with a predetermined position of the outgoing light spot, and using a photosensitive probe to measure the brightness at the hole. brightness.

Selecting several predetermined positions can be carried out according to specific needs. The more selected positions, the more data obtained can represent the brightness distribution of the projection light source, and the positions evenly distributed on the projection area can better reflect the projection brightness distribution relationship. In the embodiment of the present invention, the number and distribution area of the measurement positions of the projection area can be selected according to needs, and are not necessarily limited to the number and distribution area exemplified in this embodiment.

Step S22, acquiring the second luminance b _i of the corresponding positions of several predetermined positions of the emitted light spots of the projection light source on the projection area;

The acquisition method here can be to use equipment such as illuminance meter to measure. After the outgoing light spot of the projection light source is projected into the projection area, the shape of the light spot does not change. Therefore, the corresponding positions of several predetermined positions of the outgoing light spot of the projection light source on the projection area only need to be calculated according to the ratio of the projection area to the outgoing light spot. It is sufficient to enlarge the distance between the several predetermined positions of the outgoing light spot and the distance between the several predetermined positions and the edge on the projected area at this ratio. Figure 2c is a schematic diagram of the light spot emitted by the projection light source, and Figure 2d is a schematic diagram of the brightness measurement position of the projection area corresponding to the light spot emitted by the projection light source in Figure 2c, as shown in Figure 2c, the light spot has a length and a width of N and M respectively Rectangular, as shown in Figure 2d, the projection area is a rectangle whose length and width are 9N and 9M respectively, so when the distance between the spot position A ₁ and the adjacent A ₂ and A ₄ is L2 and L1 respectively, and When the edge distances are all 0, the distance between the corresponding B1 position and the adjacent B ₂ and B ₄ is enlarged by 9 times to 9L1 and 9L2 , and the distance from the edge is still 0 when enlarged by 9 times.

Step S23, obtaining the expected luminance p _i of corresponding positions of several predetermined positions of the emitted light spot of the projection light source on the projection area;

The desired brightness can be pre-set in the storage device according to different requirements, so the desired brightness in this step can be obtained directly from the storage device; of course, it can also be obtained through the input device.

It should be noted here that steps S21-S23 are not necessarily in a chronological order.

Step S24, obtain the third luminance c _i of several predetermined positions of the outgoing light spot of the projection light source required to obtain the desired luminance on the projection area by the following formula:

Where i is an integer greater than or equal to 1;

The third brightness of several predetermined positions in this step can be calculated by the calculation device according to the formula.

Step S25, adjusting the projection light source so that the brightness of several predetermined positions of the light spot emitted by the projection light source is the third brightness c _i .

The adjustment of the third brightness c _i here is to adjust according to the ratio of the third brightness at several positions, and not necessarily adjusted to the calculated absolute value. In fact, the measured brightness value is related to the measurement device and the size of the measurement area, whether it is a number of predetermined positions in the projection area or a number of predetermined positions of the light spot emitted by the projection light source. Therefore, a single value of the measurement data does not make much sense. What is actually needed is a data sequence, and the ratio between different data is meaningful.

For the convenience of calculation, preferably, the above calculation process is based on the brightness b _i of the position B i of the projection area, the brightness _{a i of} different positions A _i in the spot corresponding to the position B _i of the projection area, and the expected brightness p of the position of the projection area B _{i i} , calculated after normalization. For example, setting the expected brightness p _i of the projection area in this embodiment as 1, and performing corresponding conversions on other parameters can simplify the calculation.

The adjustment method of the projection light source 210 may be to select a new light source to replace the original projection light source. For example, a new light source is designed so that the luminance of several predetermined positions of the emitted light spot of the light source is the third luminance c _i , and the light source is replaced to the position of the original light source.

For the case where the projection light source is composed of multiple light-emitting elements, the adjustment method of the projection light source 210 may also be to adjust the power of the light-emitting elements corresponding to several predetermined positions of the light spots emitted by the projection light source, so that several of the light spots emitted by the projection light source The brightness at the predetermined position is the third brightness c _i .

The projection light source 210 can also be adjusted by adding an optical element to the projection light source 210 that can change the brightness distribution of the light spots emitted by the projection light source 210. The optical element and the projection light source 210 form a new projection light source. This situation will be described in the second embodiment for further explanation.

The following description will be made by taking the expected luminance distribution in the projection area as an example of uniform distribution. At this time, the expected luminance p _i at different positions B _i in the projection area is a constant p ₀ .

As shown in Figure 2d, in this embodiment, 9 positions are selected in the projection area, namely B ₁ , B ₂ , B ₃ ... B ₉ , and these 9 positions are evenly distributed on the projection area, which can better reflect The brightness distribution relationship of the projection. According to the expected brightness distribution, the expected brightness p _i of the corresponding position of the predetermined position of the outgoing light spot on the projection area can be obtained.

Specifically, taking the position B ₁ of the projection area in FIG. 2d as an example, the brightness of the position B ₁ in the projection area of the projection light source 210 is measured by an illuminance meter as b ₁ . Using the _imaging method, measure the _brightness measured at the position _A1 of the projection light spot corresponding to the projection light source ₂₁₀ corresponding to the position _B1 . The brightness of position _A1 is _c1 , and the light transmission transmittance _N1 of the optical path system between the position _B1 of the projection area and the position _A1 of the outgoing light spot of the projection light source 210 is constant, so:

$\frac{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}}{{\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; =</span>{\mathrm{<span\; class="notranslate">\; N</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; ,</span>$

The brightness at position _B1 of the projection area is _b1 , and the brightness at position _A1 of the exit light spot of the projection light source 210 corresponding to position _B1 is _a1 . Both have been obtained through measurement, and the brightness at position _B1 of the projection area reaches the expected value p ₀ is set according to the needs, so the brightness c ₁ can be derived by the above formula. To make the brightness of the projection area B ₁ reach the expected value p ₀ , the brightness c ₁ of the spot A ₁ position must satisfy:

${\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; 0</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; 1</span>}}}<span\; class="notranslate">\; ,</span>$

Similarly, for other positions A ₂ , A _{3 .} That is, the brightness distribution of the light spot emitted by the projection light source can be calculated according to the projected brightness expected to be achieved in the projection area and the brightness of the corresponding position of the light spot emitted by the projection light source 210, so as to adjust the projection light source 210 to achieve brightness Evenly distributed projection area. The adjustment here is to adjust the brightness of the position on the light spot on the projection light source 210 corresponding to the position where the brightness of the projection area is relatively low relative to the projection light source 210, and increase the brightness and the ratio of the increase is higher than that of the position with higher brightness. Or reduce its brightness and the reduction ratio is lower than the higher brightness position.

It is worth noting that, in this embodiment, for all points selected in the projection area, their expected brightness values are set to be the same, that is, the projection area has a uniform brightness distribution. In other implementations of the present invention, for all points selected in the projection area, the expected brightness values may be set to be different, and images in other brightness distribution forms may be obtained for application in some specific occasions.

In this embodiment, the projection light source 210 with the first luminance A _i at several positions of the emitted light spot is used as the reference light source, and the brightness distribution of the projection area of the projection light source 210 is measured at this time, and the emission of the projection light source is adjusted according to the brightness distribution. The energy distribution of the spot, the projected area to obtain the desired brightness distribution.

The projection system in this embodiment adjusts the projection light source by the above method to improve the brightness uniformity of the projection area, and compared with the projection system in the prior art, components such as dodging rods and lenses are omitted, and a compact structure is realized. Use handheld projection equipment.

In fact, considering various uncertain factors, such as the non-linear response of the projection optical system to the brightness of the light source, the brightness distribution of the spot of the light emitted by the second light source obtained by one measurement may not be able to achieve the desired brightness distribution of the projection area , preferably, the above-mentioned calculation process can be repeated multiple times, and finally obtain a projection area with an ideal brightness distribution.

In this embodiment, taking the expected brightness distribution of the projected area as an example of a uniform brightness distribution, the expected brightness p _i =p ₀ , where p ₀ is a constant. There are many ways to calculate whether the brightness of the projected image satisfies the requirement of uniform distribution, such as judging by measuring the ratio of the brightness of the middle area _A9 to the average brightness of all measurement areas, or measuring the ratio of the brightness maximum area to the average brightness of all measurement areas Ratio to compare. There are many methods for judging the uniformity of brightness, and the method for judging the uniformity of brightness and the judgment threshold can be selected according to specific needs.

In this embodiment, the projection light source is an LED array, so step S25 in FIG. 2b may include: adjusting the brightness of LEDs corresponding to several predetermined positions in the LED array, so that the brightness of the corresponding LEDs is the third brightness c _i . Obviously, the brightness distribution of the light spot emitted by the LED light source is easy to adjust, for example, by changing the voltage or current corresponding to the LED.

Embodiment two

FIG. 3 a is another structural schematic diagram of the projection system of the present invention. As shown in FIG. 3 a , the projection system includes a projection light source 310 a, a lens 320 , a total internal reflection prism 340 , a light modulation unit 330 , and a projection lens 350 . The output light of the projection light source 310a is adjusted by the lens 320 and enters the total internal reflection prism 340, then enters the light modulation unit 330 for modulation, and finally exits the total reflection lens 340 to the projection lens 350 for projection.

Fig. 3b is a schematic flowchart of the adjustment method of the projection light source of the projection system shown in Fig. 3a. As shown in Fig. 3b, compared with the adjustment method of the projection light source shown in Fig. Steps S21-S24 shown above are the same, the difference lies in:

Step S25 in FIG. 2b is specifically step S35 in FIG. 3b in this embodiment: setting a shaping device 314 for adjusting the brightness at a predetermined position of the emitted light spot of the projection light source to the third brightness c _i , which The adjusted output light of the projection light source enters the light modulation unit.

Specifically, the projection light source 310a shown in FIG. 3a is the original projection light source. As shown in FIG. Compared with directly replacing the projection light source 310a with a new light source, it is easier to adjust the projection light source 310a by adding the shaping device 314, and the components of the projection light source 310a can be fully utilized to save costs.

The shaping device here is specifically a free-form surface lens, which can shape the light spot emitted by the projection light source 310a into a required illuminance distribution. Reshaping lenses can be molded using professional optical design software, and manufactured by injection molding and other methods. In other embodiments of the present invention, the shaping device 314 may also be a DOE (Diffractive optical element, diffractive optical element) or other device having a shaping effect.

Specifically, in this embodiment, the projection light source 310 a includes an excitation light source 311 , a wavelength converting device 312 , and a light homogenizing device 313 . The wavelength conversion device 312 receives the outgoing light of the excitation light source 311 and at least partially converts it into the received light for emission, and the adjusted projection light source 310b includes a projection light source 310a and a shaping device 314, and the shaping device 314 is arranged on the outgoing light path of the projection light source 310a . The wavelength conversion device 312 is provided with a wavelength conversion material, which is phosphor powder, but in other embodiments of the present invention, it may also be a material with wavelength conversion capability such as quantum dots and fluorescent dyes, and is not limited to phosphor powder. In addition, in other embodiments of the present invention, the projection light source 310a and the adjusted projection light source 310b may also be other types of light sources, such as LED light sources, laser light sources, and the like.

In other embodiments of the present invention, the excitation light source 311 and the wavelength conversion device 312 may be replaced by other light sources, such as LED light sources.

The projection light source 310a in this embodiment further includes a dodging device 313, and the received light emits a light spot with a uniform illuminance distribution after passing through the dodging device 313. The dodging device 313 in this embodiment is a dodging rod, and the dodging rod can also be replaced by other devices, such as a fly-eye lens, as long as the illuminance distribution of the spot of the emitted light is ensured to be uniform.

From the analysis in the embodiment shown in Fig. 2a, it can be seen that after the projection light source is adjusted, the brightness of the position of the projection area B _i reaches the expected value p _i , and the brightness c _i of the position corresponding to the position of the outgoing light spot A _i must satisfy:

${\mathrm{<span\; class="notranslate">\; c</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; =</span>\frac{{\mathrm{<span\; class="notranslate">\; p</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}<span\; class="notranslate">\; \&times;</span>{\mathrm{<span\; class="notranslate">\; a</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}{{\mathrm{<span\; class="notranslate">\; b</span>}}_{\mathrm{<span\; class="notranslate">\; i</span>}}}<span\; class="notranslate">\; ,</span>$

In this embodiment, since the illuminance distribution of the light emitted by the projection light source 310a is uniform, the brightness a _i at the spot A _i of the light emitted by the projection light source is a constant value a ₀ , which is only related to the fact that the brightness at the position A _i of the projection area reaches the expected value p _i At this time, it is easier to design the light spot brightness distribution of the second projection light source 310b, for example, in the case of using a shaping device to shape the projection light source 310a, the shaping device is easier to design.

Fig. 3d is another structural schematic diagram of the adjusted projection light source of the projection system shown in Fig. 3a. As shown in Fig. 3d, the difference from Fig. 3c is that in the projection light source 310c, the uniform light rod 313 is located between the excitation light source 311 and the wavelength conversion between devices 312 . In the existing projection system, the light spot of the excitation light source incident on the fluorescent pink wheel has an irregular shape, and the light power density is not uniform within the range of the light spot. The homogenization rod can change the shape of the light spot into the same shape as the DMD modulation surface, such as a 4:3 or 16:9 rectangle, which makes the light spot imaged on the DMD surface can have a good match with its modulation surface, and the maximum The loss of light incident on the outside of the DMD is reduced; at the same time, the dodging rod can make the light distribution in the light spot at the exit of the dodging rod uniform, which ensures the uniformity of the image on the projection and the screen. However, the problem with using a uniform rod is that in order to ensure the coupling efficiency, the size of the light spot incident on the entrance of the uniform rod must be smaller than the entrance of the uniform rod, which makes it necessary to control the light spot of the excitation light source incident on the fluorescent pink wheel. It is very small, which in turn increases the power density of the spot. This leads to a decrease in the efficiency of the phosphor. And when the uniform light rod 313 is placed between the excitation light source 311 and the wavelength conversion device 312, the uniform light rod 313 can receive the excitation light spot and directly emit a uniform light spot that matches the shape of the DMD to the wavelength conversion device. After the excitation of the wavelength conversion material, the shape of the emitted light spot and the brightness distribution change little, and it will not cause the problem of placing the uniform light rod in the subsequent optical path of the wavelength conversion device, so it is a preferred structure.

In this embodiment, the shaping device is located on the outgoing light path of the original light emitting device. In other embodiments, the shaping device can also be located on the optical path between the excitation light source 311 and the wavelength conversion device 312. Since the excitation light source 311 is closer to the point light source than the wavelength conversion device 312, the shaping device is easier to adjust. In addition, In this structure, there is no need to install a light dodging device such as a light dodging rod in the subsequent optical path.

Embodiment three

Fig. 4 is a schematic diagram of an embodiment of the projection light source adjustment device of the present invention. As shown in Fig. 4, the adjustment device includes a first acquisition module, a second acquisition module, a third acquisition module, and a fourth acquisition module.

The first acquisition module is used to acquire the first brightness a _i of several predetermined positions of the outgoing light spot of the projection light source;

The first acquisition module may include a photosensitive probe and a data transmission device. The photosensitive probe measures the first brightness a i of several positions of the light spots emitted by the projection light source and transmits the first brightness a _i to the fourth acquisition module. The first acquiring module may also be a receiving device, configured to receive data sent by the sensory probe of the peripheral device.

The second acquisition module is used to acquire the second brightness b _i of the corresponding positions of several predetermined positions of the outgoing light spot on the projection area;

Similar to the first acquisition module, the second acquisition module may also include an illuminance meter and a corresponding data transmission device, the illuminance meter measures the second luminance b _i of several positions in the projection area and transmits it to the fourth acquisition module; the second acquisition module may also It is a receiving device for receiving the data sent by the peripheral illuminance meter.

The third acquisition module is used to acquire the expected luminance p _i of corresponding positions of several predetermined positions of the outgoing light spot on the projection area;

The third acquisition module may include an input device and a corresponding data transmission module, the input device is used to input the expected brightness distribution of several positions in the projection area and transmit it to the fourth module.

The fourth acquisition module is used to obtain the third luminance c _i of several predetermined positions of the outgoing light spot of the projection light source required to obtain the desired brightness on the projection area through the following formula, so as to obtain the predetermined positions of the outgoing light spot of the projection light source Position the luminance adjusted to the third luminance c _i : Where i is an integer greater than or equal to 1.

The fourth acquisition module may include a data storage module and a calculation module, the data storage module may receive and store data from the first, second and third acquisition modules, and the calculation module is used to calculate the third brightness according to the data and the above formula c _i .

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above is only the embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process conversion made by using the description of the present invention and the contents of the accompanying drawings, or directly or indirectly used in other related technologies fields, all of which are equally included in the scope of patent protection of the present invention.

Claims (7)

1. the method for adjustment of the projection light source of an optical projection system, it is characterized in that, described optical projection system comprises projection light source, light-modulating cell, projection lens, the emergent light of described projection light source incides described light-modulating cell, and outgoing, to described projection lens, finally shines view field through described projection lens projection after this light-modulating cell modulation; The method of adjustment of described projection light source comprises:

Obtain the first brightness a in some precalculated positions of the emergent light hot spot of described projection light source _i;

Obtain the second brightness b of some precalculated positions correspondence position in view field of described emergent light hot spot _i;

Obtain the expectation brightness p of some precalculated positions correspondence position in view field of described emergent light hot spot _i;

By following formula, obtain the 3rd brightness c in some precalculated positions of the emergent light hot spot that obtains the needed projection light source of described expectation brightness in view field _i:

wherein i is more than or equal to 1 integer;

Adjust described projection light source, making the brightness in some precalculated positions of the emergent light hot spot of this projection light source is described the 3rd brightness c _i.

2. method of adjustment according to claim 1, is characterized in that, first Luminance Distribution in some precalculated positions of the hot spot of the emergent light of described projection light source is for being uniformly distributed.

3. method of adjustment according to claim 1, is characterized in that, described adjustment projection light source, and making the brightness in some precalculated positions of the emergent light hot spot of this projection light source is described the 3rd brightness c _icomprise:

Apparatus for shaping is set, for being described the 3rd brightness c by the brightness adjustment in some precalculated positions of the emergent light hot spot of described projection light source _i, the emergent light after this projection light source adjustment is incident to described light-modulating cell.

4. method of adjustment according to claim 3, it is characterized in that, described projection light source comprises excitation source and Wavelength converter, described Wavelength converter receives the exciting light of described excitation source to produce Stimulated Light, and the mixed light of the unabsorbed exciting light of outgoing and Stimulated Light or this Stimulated Light;

Described apparatus for shaping is in the light path between described excitation source and Wavelength converter.

5. method of adjustment according to claim 1, is characterized in that, described projection light source comprises LED array;

Described adjustment projection light source, making the brightness in some precalculated positions of the emergent light hot spot of this projection light source is described the 3rd brightness c _icomprise: adjust the brightness of LED corresponding with described some precalculated positions in described LED array, the brightness that makes this corresponding LED is described the 3rd brightness c _i.

6. an adjusting gear for projection light source, is characterized in that, comprising:

The first acquisition module, for obtaining the first brightness a in some precalculated positions of the emergent light hot spot of projection light source _i;

The second acquisition module, for obtaining the second brightness b of some precalculated positions correspondence position in view field of described emergent light hot spot _i;

The 3rd acquisition module, for obtaining the expectation brightness p of some precalculated positions correspondence position in view field of described emergent light hot spot _i;

The 4th acquisition module, for obtaining the 3rd brightness c in some precalculated positions of the emergent light hot spot that obtains the needed projection light source of described expectation brightness in view field by following formula _i, so that be described the 3rd brightness c by the brightness adjustment in some precalculated positions of the emergent light hot spot of described projection light source _i,

wherein i is more than or equal to 1 integer.

7. an optical projection system, it is characterized in that, described optical projection system comprises projection light source, light-modulating cell, projection lens, the emergent light of described projection light source incides described light-modulating cell, and outgoing, to described projection lens, finally shines view field through described projection lens projection after this light-modulating cell modulation;

Described projection light source comprises LED array;

Described optical projection system also comprises projection light source adjusting gear, and this adjusting gear is for obtaining the first brightness a in some precalculated positions of the emergent light hot spot of projection light source _i; Obtain the second brightness b of some precalculated positions correspondence position in view field of described emergent light hot spot _i; Obtain the expectation brightness p of some precalculated positions correspondence position in view field of described emergent light hot spot _i; By following formula, obtain the 3rd brightness c in some precalculated positions of the emergent light hot spot that obtains the needed projection light source of described expectation brightness in view field _i:

wherein i is more than or equal to 1 integer;

Described adjusting gear is also for adjusting the brightness of the LED that described LED array is corresponding with described some precalculated positions, and the brightness that makes this corresponding LED is described the 3rd brightness c _i.