CN108254908A - A kind of light-source system and display device - Google Patents

Abstract

The invention discloses a light source system and a display device. The light source system includes: a light source component, used to emit source light; a light modulator, located on the optical path of the source light, used to modulate the source light to obtain modulated light; a light refraction element, having at least two regions with different refractive indices , used to refract the modulated light; the controller, used to control the synchronous driving of the light source component and the photorefractive element, so that the source light enters the light modulator periodically and passes through at least two regions of different refractive indices of the photorefractive element synchronously. Different refraction to generate pixel offset to achieve pixel superposition. Through the above method, the present invention can improve image resolution, thereby improving user experience.

Description

A light source system and display device

technical field

The invention relates to the field of display technology, in particular to a light source system and a display device.

Background technique

In order to improve the image resolution, the size of the pixel unit will usually be smaller and smaller, and the diffraction effect of the illumination light on the DMD (Digital Micromirror Device, Digital Micromirror Device) panel will become more and more serious as the size of the pixel unit becomes smaller. The reduction in pixel unit size will result in a reduction in the efficiency of display devices such as projection systems. To maintain luminous efficiency generally requires larger panels and higher costs.

In the prior art, the resolution is usually improved through the following two techniques:

The first type: E-shift (electronic shift) technology, that is, through the birefringence principle, the light incident on the liquid crystal panel is divided into different directions and emitted. Specifically, please refer to Figure 1-Figure 2, the incident light is polarized light, when the polarized light enters the liquid crystal panel 10 and then enters the refraction plate 11, the light will be refracted (as shown in Figure 1), and finally projected on the screen The pixels of will also shift (as shown in Figure 2), and for the same pixel unit, due to the superposition of pixels brought about by the pixel shift, a higher resolution image is finally obtained. In other words, the user can see More detailed and clearer picture.

However, although high-quality pictures can be obtained, there are corresponding defects in the scheme adopted:

1. Since it only performs refraction processing for polarized light and cannot perform light processing for natural light, its application range is relatively limited;

2. Liquid crystal components are prone to aging.

The second type: smooth picture (smooth picture) technology, which is a mechanical method, as shown in FIG. 3 . Mainly, after the incident light is injected into the DMD 41, after being guided by the light-splitting and combining prism composed of two triangular prisms 42, it is refracted through a left-right reciprocating linear motion glass sheet 43 and an obliquely arranged glass sheet 44. and eject. This solution is also due to pixel shifting which ultimately leads to an increase in resolution.

In the second scheme, when the light is injected into the combination of the linearly reciprocating glass sheet 43 and the obliquely arranged glass sheet 44, the incident light will be offset, and its offset is related to the incident angle of the light, and the glass sheet The refractive index and the thickness of the glass sheet are related to factors such as the following relationship:

Among them, Δy is the offset of the light, t is the thickness of the glass sheet, θ is the incident angle of the light, and n is the refractive index of the glass sheet.

Due to the shift of light, the position of pixels on the projection screen will eventually shift, and the human eye can superimpose the shifted pixels through the afterglow effect, and finally realize the improvement of image resolution.

However, this solution has a disadvantage: due to the linear motion of the glass sheet, the emitted light cannot stay in a certain state for a long time (as shown in Figure 4), and the finally formed image pixels cannot stay in a certain state for a long time , the image pixels are always dynamic and cannot be superimposed, so the formed partial image may be blurred and unclear, and cannot provide a stable high-resolution image, so it cannot meet the needs of users.

Contents of the invention

The technical problem mainly solved by the present invention is to provide a light source system and a display device, which can improve the resolution of images to obtain good user experience.

In order to solve the above technical problems, a technical solution adopted by the present invention is to provide a light source system, which includes:

A light source component, used for emitting source light;

a light modulator, located on the light path of the source light, for modulating the source light to obtain modulated light;

a photorefractive element having at least two regions of different refractive indices for refracting the modulated light;

a controller, configured to control the synchronous driving of the light source assembly and the photorefractive element, so that the source light periodically enters the light modulator and passes through the at least two different refractive indices of the photorefractive element Different refractions are performed on different regions to generate pixel offsets to achieve pixel superposition.

Wherein, the light source assembly includes:

A light source that emits excitation light;

The fluorescent element is located on the light path of the excitation light and is used to receive the excitation light to generate the source light.

Wherein, the light modulator is any one of DMD, LCD or LCOS.

Wherein, at least one region of the light refraction element is a structure of a through hole, and the through hole refracts passing light with the refractive index of air.

Wherein, all regions with different refractive indices of the light refraction element are made of solid material, and the passing light is refracted with the refractive index of the used solid material.

Wherein, the regions of different refractive indices of the light refraction element are made of different materials, and the different materials are connected by gluing or integral molding.

Wherein, the same material is used for the regions with different refractive indices of the light refraction element, and different refractive indices are realized by setting different thicknesses.

Wherein, the shape of the light refraction element is a disk, a bar or a crawler.

Wherein, the light source system further includes a prism, arranged between the light source component and the light modulator, for guiding the incoming light;

The light refraction element is disposed between the prism and the lens or between the light modulator and the prism.

Wherein, the light source system further includes a first driving device and a second driving device, wherein the first driving device is used to drive the fluorescent element, and the second driving device is used to drive the photorefractive element;

The controller controls the fluorescent element and the light refraction element to be synchronized by controlling the first driving device and the second driving device.

Wherein, there are M regions with different refractive indices on the photorefractive element, and the controller controls the rotation frequency at which the first drive device drives the fluorescent element to be the rotation frequency at which the second drive device drives the photorefraction element at least M times, wherein said M is an integer greater than or equal to 2.

Wherein, the fluorescent element and the photorefractive element are provided with marking positions, and a sensor is provided on one side of the fluorescent element and the photorefractive element, and the sensor detects the positions of the fluorescent element and the photorefractive element , and send the position information to the controller, and the controller controls the synchronization of the fluorescent element and the light refraction element according to the position information.

In order to solve the above-mentioned technical problems, another technical solution adopted by the present invention is to provide a display device, which includes any one of the light source systems mentioned above.

The beneficial effects of the present invention are: different from the situation of the prior art, the present invention provides a light source system and a display device, the light source system includes a light source assembly, a light modulator, a light refraction element and a controller, wherein the light source assembly is used to emit source light, the light modulator is located on the light path of the source light, and is used to modulate the source light to obtain modulated light, the photorefractive element has at least two regions with different refractive indices, and is used to refract the modulated light, and the controller is used to control The light source component and the photorefractive element are synchronously driven, so that the source light enters the light modulator periodically, and simultaneously passes through at least two regions of different refractive indices of the photorefractive element for different refraction, so as to generate pixel offset to realize superposition of pixels. Therefore, the present invention can improve the resolution of images to obtain good user experience.

Description of drawings

FIG. 1 is a schematic diagram of refraction of a display device provided in the prior art;

FIG. 2 is a pixel offset diagram of the display device shown in FIG. 1;

FIG. 3 is a schematic structural diagram of another display device provided in the prior art;

Fig. 4 is a trace diagram of the outgoing light of the display device shown in Fig. 3;

Fig. 5 is a schematic structural diagram of a light source system provided by an embodiment of the present invention;

Fig. 6 is a schematic structural diagram of another light source system provided by an embodiment of the present invention;

Fig. 7 is a schematic structural diagram of another light source system provided by an embodiment of the present invention

Figures 8-14 are schematic structural views of different light refraction elements;

Fig. 15 is a trace diagram of the emitted light of the light source system according to the embodiment of the present invention.

Detailed ways

Please refer to FIG. 5 , which is a schematic structural diagram of a light source system provided by an embodiment of the present invention. As shown in FIG. 5 , the light source system 50 of this embodiment includes a light source assembly 51 , a light modulator 52 , a light refraction element 53 and a controller 54 .

Wherein, the light source assembly 51 is used for emitting source light. The light source assembly of this embodiment includes a light source 511 and a fluorescent element 512 . The light source 511 is preferably a laser light source for emitting excitation light. The fluorescent element 512 is located on the optical path of the excitation light, and is used for receiving the excitation light to generate source light. In this embodiment, the laser light is the stimulated light generated after the fluorescent element 512 is excited. In this embodiment, the fluorescent element 512 may be in the shape of a disk, a strip or the like.

The light modulator 52 is located on the light path of the source light, and is used for modulating the source light to obtain modulated light. Wherein, the light modulator 52 is any one of DMD, LCD (Liquid Crystal Display, liquid crystal display) or LCOS (Liquid Crystal on Silicon, liquid crystal on silicon). The number of light modulators 52 can be one, two, three or more.

The light refraction element 53 has at least two regions with different refractive indices for refracting the modulated light. In this embodiment, the shape of the light refraction element 53 is a disc shape (as shown in FIG. 5 and FIG. 6 ), a strip structure or a belt shape (as shown in FIG. 7 ), and the like. The material of the light refraction element 53 can be selected according to needs, for example, glass can be used.

Further, the light source system 50 further includes a prism 57 . In FIG. 5 , the prism 57 includes two triangular prisms 571 and 572 , which are used to guide the excitation light emitted by the light source assembly 51 to the light modulator 52 . In this embodiment, the light refraction element 53 is disposed between the prism 57 and the lens (not shown), as shown in FIG. 5 . The light emitted from the light source assembly 51 passes through the prism 57 and reaches the light modulator 52, and the modulated light modulated by the light modulator 52 passes through the prism 57 again and enters the light refraction element 53 driven by the driving device.

In other embodiments, the light refraction element 53 can also be arranged between the light modulator 52 and the prism 57, as shown in FIGS. 6 and 7, wherein the light refraction element in FIG. The elements are in the form of tracks. In this way, the distance between the light modulator 52 and the light refraction element 53 can be made closer, so that the light hits the light refraction element 53 more concentratedly, thereby reducing the BFL (Back focal length, back intercept) of the lens.

In this embodiment, the setting of regions with different refractive indices of the light refraction element 53 includes the following two types:

The first type is to provide a light refraction element 53 with a through-hole structure, that is, at least one area of the light-refraction element 53 is a through-hole structure, and the through-hole refracts passing light at the refractive index of air. Specifically, take the light-refractive element 53 as an example having two regions with different refractive indices. In practical application, in order to make the process convenient, the light refraction element 53 of the same material can be arranged as a structure with a through hole, as shown in Figures 8 and 9 respectively, taking the material of the light refraction element 53 as an example, as shown in Figure 8 It is a glass disc with a through hole, and Fig. 9 is a glass rod with a strip structure with a through hole. In order to achieve that the light refraction element 53 has two kinds of refraction indices, that is, the refraction index of the through hole area is the refractive index n1 of air, and the other area is the refraction index n2 of the original material of the light refraction element 53 . Further, in order to make the light refraction element 53 rotate at a constant speed, the through holes can be arranged symmetrically. Please refer to FIG. 10 and FIG. 11 for details. FIG. Through holes are symmetrically arranged on both sides with the center line of the glass rod as the axis of symmetry.

In this embodiment, the offset of the light is related to the incident angle of the light, the refractive index of the light refraction element 53 and the thickness of the light refraction element 53, namely

Wherein, Δy is the offset of the light, t is the thickness of the light refraction element 53 , θ is the incident angle of the light, and n is the refractive index of the light refraction element 53 .

According to the above relationship, when t and θ are equal, when the light passes through the through hole of the light refraction element 53 (corresponding to the region with a refractive index n1), since n1 is the refractive index of air, which is almost equal to 1, the light goes along the Propagate in the original direction, and when the light enters the area with the refractive index n2, since n2 is the refractive index of the photorefractive element 53, which is not equal to 1, the light will be shifted, and finally the outgoing light corresponding to the two areas will appear on the screen Upprojected image pixels are superimposed to increase resolution.

If the photorefractive element 53 has three or more regions with different resolutions, different materials or the same material can be used in the regions other than the through holes to achieve different refractive indices. For specific settings, refer to the second method described below. Setting method.

In the second type, all regions with different refractive indices of the light refraction element 53 are made of solid material, and the passing light is refracted with the refractive index of the used solid material. That is, in the second arrangement method, the light refraction element 53 is not provided with a through-hole structure. This setting method also includes the following two different setting schemes:

One of the setting schemes is: different materials are used for the regions with different refractive indices of the light refraction element 53, which can effectively solve the problem of the balance of the light refraction element 53, and at the same time better solve the above-mentioned light refraction element 53 with through holes. Problems with stray light on edges. Specifically, the light refraction element 53 can be arranged in sections, taking the light refraction element 53 as a disk structure as an example, as shown in Figures 12-14, the light refraction element 53 is divided into 2 sections, 4 sections and 8 sections respectively , wherein the area of each section is preferably the same. And set the material used by each section according to the needs, each section can use a material with a different refractive index or some sections can use a material with the same refractive index. It is only necessary to set the material of A type of refractive index in a specific area, where A is the number of refractive indices included in the light refraction element 53 .

For example, if the light refraction element 53 includes two regions with different refractive indices n1 and n2, materials with refractive indices n1 and n2 can be used, as shown in FIGS. 12-14 . In FIG. 12 , the light refraction element 53 is divided into two sections, and materials with refractive indices n1 and n2 are used respectively. In FIGS. 13 and 14 , the light refraction element 53 is divided into 4 sections and 8 sections respectively, and materials with n1 and n2 refractive indices are alternately used.

In this embodiment, materials with different refractive indices can be connected by gluing to avoid image blur caused by gaps between materials. In another solution, materials with different refractive indices can be formed in one piece to realize seamless connection of materials with different refractive indices.

The above are the settings for different materials with different refractive indices. In this embodiment, the same material can also be used to achieve different refractive indices, specifically, different refractive indices can be achieved by setting the thickness of the same material to be different.

Please refer to FIG. 5 again. In this embodiment, the controller 54 is used to control the synchronous driving of the light source assembly 51 and the photorefractive element 53, so that the source light enters the light modulator 52 periodically and passes through at least two of the photorefractive element 53 synchronously. Regions with different refractive indices undergo different refraction to generate pixel offsets to achieve pixel superposition. Specifically, the light source system 50 further includes a first driving device 55 and a second driving device 56 , wherein the first driving device 55 is used to drive the fluorescent element 512 , and the second driving device 56 is used to drive the light refraction element 53 . In this embodiment, the first driving device 55 and the second driving device 56 are preferably driving motors.

The controller 54 specifically controls the synchronization of the fluorescent element 512 and the light refraction element 53 by controlling the first driving device 55 and the second driving device 56 . If there are M regions with different refractive indices on the photorefractive element 53, then the controller 54 controls the first drive device 55 to drive the rotation frequency of the fluorescent element 512 to be at least M times the rotation frequency of the second drive device 56 to drive the photorefraction element 53 , where M is an integer greater than or equal to 2.

In this embodiment, in order to facilitate the control of the controller 54, the shapes of the fluorescent element 512 and the light refraction element 53 are preferably the same, for example, they are both disc-shaped or strip-shaped. Taking the fluorescent element 512 and the photorefractive element 53 as an example, if the photorefractive element 53 includes two regions with different refractive indices, then the second driving device 56 is controlled to drive the photorefractive element 53 to rotate one revolution, and the first driving device is controlled to 55 drives the fluorescent element 512 to rotate at least two weeks, such as controlling the cycle of the first driving device 55 to 120HZ, then controlling the cycle of the second driving device 56 to be 60HZ, and two frames of images are superimposed into one image; similarly, if the photorefractive element 53 includes four regions with different refractive indices, the second driving device 56 is controlled to drive the light refraction element 53 to rotate for one revolution, and the first drive device 55 is controlled to drive the fluorescent element 512 to rotate for at least four circles. In the case where the expected resolution needs to be achieved, the synchronization between the fluorescent element 512 and the photorefractive element 53 can be satisfied by changing the rotation speed of the fluorescent element, or the synchronization between the fluorescent element 512 and the photorefractive element 53 can be satisfied by changing the photorefractive element 53 . If the scheme of changing the photorefractive element 53 is adopted, the segmented structure on the photorefractive element 53 needs to be considered. If the photorefractive element 53 is set as the 2nd, 4th and 8th sections as shown in Fig. 12-14, then the photorefractive element 53 can be set. The rotation speeds are 3600rpm, 1800rpm, and 900rpm respectively, so that the period of the motion track of the outgoing light is more abundant.

Furthermore, a mark position is set on the fluorescent element 512 , and a sensor (not shown) is set on one side of the fluorescent element 512 . Marking positions are set on the light refraction element 53 , and a sensor (not shown) is set on one side of the light refraction element 53 . The sensor detects the positions of the fluorescent element 512 and the photorefractive element 53, and sends the position information to the controller 54, and the controller 54 controls the synchronization of the fluorescent element 512 and the photorefractive element 53 according to the position information.

Therefore, in this embodiment, the photorefractive element 53 is used to switch between different refractive indices, and the synchronization between the fluorescent element 512 and the photorefractive element 53 is controlled, so that the emitted light stays in a certain state for a long time (as shown in FIG. 15 ). , The finally formed image pixels can stay in a certain state for a long time, not only overcome the unclear image caused by the refractive index oscillation in the traditional technology, but also make the structure of the machine simpler.

In addition, the controller 54 of this embodiment further controls the synchronization of the light source 511 , the fluorescent element 512 , the light modulator 52 and the light refraction element 53 .

An embodiment of the present invention also provides a display device, which includes the light source system as described above. The display device is an educational projector, a laser TV, a micro-projector or a theater machine.

To sum up, the present invention increases the resolution of images to obtain good user experience.

The above is only an embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation 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 (13)

1. a kind of light-source system, which is characterized in that the light-source system includes：

Light source assembly, for emission source light；

Optical modulator, in the light path of the source light, for being modulated to obtain modulation light to the source light；

Photorefractive element, including at least two regions, the refractive index in each region is different, for being rolled over to the modulation light It penetrates；

Controller, for controlling light source assembly driving synchronous with the photorefractive element so that the source photoperiodism Into the optical modulator, and at least two region Jing Guo the photorefractive element carries out different refractions, to generate Pixel-shift realizes the superposition of pixel.

2. light-source system according to claim 1, which is characterized in that the light source assembly includes：

Light source sends out exciting light；

Fluorescent element, in the light path of the exciting light, for receiving the exciting light to generate the source light.

3. light-source system according to claim 1, which is characterized in that the optical modulator is in DMD, LCD or LCOS It is any.

4. light-source system according to claim 1, which is characterized in that at least one region of the photorefractive element is logical The structure in hole, the modulation photoperiodism pass through the through-hole and another region to be reflected to the modulation light.

5. light-source system according to claim 1, which is characterized in that at least two region of the photorefractive element Using entity material quality, the modulation light, which respectively enters, uses at least two region of entity material quality with to the modulation light It is reflected.

6. light-source system according to claim 5, which is characterized in that at least two region of the photorefractive element Using different materials, different materials is by way of glued or integrally formed mode is attached.

7. light-source system according to claim 5, which is characterized in that at least two region of the photorefractive element Using identical material, pass through the refractive index that different thickness is set to realize different.

8. light-source system according to claim 1, which is characterized in that the shape of the photorefractive element is disk, strip Or crawler belt shape.

9. light-source system according to claim 2, which is characterized in that the light source assembly further includes prism, for by source Light directing optical modulator；

The photorefractive element be arranged between the prism and camera lens or be arranged on the optical modulator and the prism it Between.

10. light-source system according to claim 2, which is characterized in that the light-source system further includes first driving means With the second driving device, wherein the first driving means are used to drive the fluorescent element, second driving device is used for Drive the photorefractive element；

The controller by control the first driving means and second driving device control the fluorescent element and The photorefractive element synchronizes.

11. light-source system according to claim 10, which is characterized in that there is M different folding in the photorefractive element The region of rate is penetrated, it is described second that the controller, which controls the first driving means to drive the speed of the fluorescent element, Driving device drives at least M times of the speed of the photorefractive element, wherein, the M is the integer more than or equal to 2.

12. light-source system according to claim 11, which is characterized in that on the fluorescent element and the photorefractive element Mark position is respectively provided with, and the side of the fluorescent element and the photorefractive element is respectively provided with sensor, the sensor The position of the fluorescent element and the photorefractive element is detected, and the information of the position is issued into the controller, it is described Controller controls the fluorescent element synchronous with the photorefractive element according to the information of the position.

13. a kind of display device, which is characterized in that the display device includes such as claim 1-12 any one of them light sources System.