WO2018121058A1

WO2018121058A1 - Light source system and display device

Info

Publication number: WO2018121058A1
Application number: PCT/CN2017/109324
Authority: WO
Inventors: 胡飞; 李屹
Original assignee: 深圳市光峰光电技术有限公司
Priority date: 2016-12-28
Filing date: 2017-11-03
Publication date: 2018-07-05
Also published as: CN108254908A

Abstract

A light source system (50) and a display device. The light source system (50) comprises: a light source assembly (51) used for emitting source light; a light modulator (52) located on the light path of the source light and used for modulating the source light so as to obtain modulated light; a light refracting element (53) having at least two regions with different refracting indexes and used for refracting the modulated light; a controller (54) used for controlling the light source assembly (51) and the light refracting element (53) to be synchronously driven, so that the source light periodically enters the light modulator (52) and synchronously pass through the at least two regions with different refracting indexes of the light refracting element (53) for different refractions, thereby generating pixel offset to superimpose pixels. By means of the method, the resolution of an image can be improved, thereby improving user experience.

Description

Light source system and display device

Technical field

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

Background technique

In order to improve the image resolution, usually the pixel unit size will be smaller and smaller, and the diffraction effect of the illumination light on the DMD (Digital Micromirror Device) panel will become more and more serious as the pixel unit size becomes smaller. A decrease in the size of the pixel unit may result in a decrease in the efficiency of a display device such as a projection system. In order to maintain luminous efficiency, a larger panel and higher cost are generally required.

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

The first type: E-shift (electron shift) technology, that is, the light incident on the liquid crystal panel is split into different directions by the principle of birefringence. Specifically, referring to FIG. 1 to FIG. 2, the incident light is polarized light, and when the polarized light is incident on the liquid crystal panel 10 and then enters the refracting plate 11, the light is refracted (as shown in FIG. 1), and finally projected on the screen. The pixels will also be offset (as shown in Figure 2), and for the same pixel unit, the pixel overlay due to the pixel offset will eventually get a higher resolution image, in other words, the user can see A more detailed and clear picture.

However, although a good picture can be obtained, the solution adopted has corresponding defects:

1. Since it is only subjected to refraction processing for polarized light and cannot be subjected to light treatment for natural light, it is subject to a large limitation in application range;

2. The liquid crystal element is easily deteriorated.

The second: smooth picture (smooth picture) technology, is a mechanical way, as shown in Figure 3. Mainly after the incident light is incident on the DMD 41, and then guided by the splitting and combining prisms composed of the two prisms 42, and then refracted through a glass piece 43 which is reciprocating linearly moving left and right and an inclined glass piece 44. And out. The program is also due to Pixel offset eventually leads to an increase in resolution.

In the second scheme, when the light is incident on the linearly reciprocating glass sheet 43 and the obliquely disposed glass sheet 44, the incident light is shifted, the offset is at the incident angle of the light, and the glass sheet is placed. The refractive index is related to factors such as the thickness of the glass piece, and the relationship is as follows:

Where Δy is the offset of the light, t is the thickness of the glass piece, θ is the incident angle of the light, and n is the refractive index of the glass piece.

Due to the shift of the light, the pixel position on the projection screen will eventually shift, and the human eye can superimpose the offset pixels by the afterglow effect, thereby finally improving the image resolution.

However, this solution has a disadvantage: due to the linear motion of the glass piece, the light emitted by it cannot stay in a certain state for a long time (as shown in FIG. 4), and the resulting image pixel cannot stay in a certain state for a long time. The image pixels are always dynamic and cannot be superimposed. Therefore, the formed partial images may be blurred, unclear, and cannot provide stable images with higher resolution, so the user's needs cannot be satisfied.

Summary of the invention

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

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

a light source assembly for emitting source light;

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

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

a controller for controlling the light source assembly and the light refracting element to be driven synchronously such that the source light periodically enters the light modulator and passes through the at least two different refractive indices of the light refracting element The regions are refracted differently to produce pixel offsets to implement the pixels Superposition.

Wherein, the light source component comprises:

a light source that emits excitation light;

A fluorescent element is disposed on the optical path of the excitation light for receiving 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-refracting element is a structure of a through-hole that refracts the passing light at a refractive index of air.

Wherein, all regions of different refractive indices of the light-refracting element are made of a solid material, and the refractive index of the solid material used is refracted by the passing light.

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

Wherein, the regions of different refractive indices of the light-refracting elements are made of the same material, and different refractive indices are achieved by setting different thicknesses.

The shape of the light-refracting element is a disk, a strip or a track shape.

The light source system further includes a prism disposed between the light source assembly and the light modulator for guiding light entering the 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 for driving the fluorescent element, and the second driving device is for driving the light refractive element;

The controller controls the phosphor element and the light refraction element to synchronize by controlling the first driving device and the second driving device.

Wherein the photorefractive element has M regions of different refractive indices, the controller controls the rotation frequency of the first driving device to drive the fluorescent element to be the rotation frequency of the second driving device to drive the photorefractive element At least M times, wherein M is an integer greater than or equal to 2.

Wherein the fluorescent element and the light refractive element are each provided with a mark position, and the fluorescent a sensor is disposed on one side of the light element and the light refracting element, the sensor detecting a position of the fluorescent element and the light refracting element, and transmitting information of the position to the controller, the controller Synchronization of the fluorescent element and the light refractive element is controlled based on the information of the position.

In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a display device including the light source system of any of the foregoing.

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 refracting element, and a controller, wherein the light source assembly is used for transmitting, different from the prior art. Source light, the light modulator is located on the optical path of the source light for modulating the source light to obtain modulated light, the light refractive element having at least two regions of different refractive indices for refracting the modulated light, and the controller is used for controlling The light source assembly and the light refracting element are driven synchronously such that the source light periodically enters the light modulator and simultaneously refracts through at least two regions of different refractive indices of the light refracting element to produce a pixel offset to achieve superposition of the pixels. Therefore, the present invention can improve the resolution of an image to obtain a good user experience.

DRAWINGS

1 is a schematic view showing the refraction of a display device provided by the prior art;

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

3 is a schematic structural view of another display device provided by the prior art;

Figure 4 is a trajectory diagram of the outgoing light of the display device shown in Figure 3;

FIG. 5 is a schematic structural diagram of a light source system according to an embodiment of the present invention; FIG.

6 is a schematic structural diagram of another light source system according to an embodiment of the present invention;

FIG. 7 is a schematic structural diagram of still another light source system according to an embodiment of the present invention; FIG.

8 to FIG. 14 are schematic structural views of different light refraction elements, respectively;

Figure 15 is a trajectory diagram of emitted light of a light source system according to an embodiment of the present invention.

detailed description

FIG. 5 is a schematic structural diagram of a light source system according to an embodiment of the present invention. As shown in FIG. 5, the light source system 50 of the present embodiment includes a light source assembly 51, a light modulator 52, Light refracting element 53 and controller 54.

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

A light modulator 52 is located on the optical path of the source light for modulating the source light to obtain modulated light. The optical modulator 52 is any one of a DMD, an LCD (Liquid Crystal Display), or an LCOS (Liquid Crystal on Silicon). The number of light modulators 52 may be one, two, three or more.

The light refraction element 53 has at least two regions of different refractive indices for refracting the modulated light. The shape of the light-refracting element 53 in this embodiment is a disk shape (as shown in Figs. 5 and 6), a strip structure or a belt shape (as shown in Fig. 7), and the like. The material of the light-refracting element 53 can be selected as needed, and 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 for guiding the excitation light emitted from the light source assembly 51 to the light modulator 52. In the present embodiment, the light refraction element 53 is disposed between the prism 57 and a lens (not shown) as shown in FIG. The light emitted from the light source unit 51 passes through the prism 57 and reaches the light modulator 52. The modulated light modulated by the light modulator 52 is again guided by the prism 57 and then incident on the light-refracting element 53 driven by the driving device.

In other embodiments, the light-refracting element 53 may also be disposed between the light modulator 52 and the prism 57, as shown in FIGS. 6 and 7, wherein the light-refracting element of FIG. 6 is in the shape of a disk, and the light is refracted in FIG. The components are in the form of tracks. Thereby, the distance between the light modulator 52 and the light-refracting element 53 can be made closer, so that the light is more concentrated on the light-refracting element 53, thereby reducing the BFL (Back focal length) of the lens.

In this embodiment, the setting of the regions of different refractive indices of the light-refracting elements 53 includes the following two types:

First, the light-refracting element 53 having a through-hole structure is provided, that is, at least one region of the light-refracting element 53 is a through-hole structure, and the through-hole is folded at a refractive index of air by passing through the light. Shoot. Specifically, a region in which the light refractive element 53 has two different refractive indices is exemplified. In practical applications, for the convenience of process fabrication, the light-refracting element 53 of the same material may be provided with a through-hole structure, as shown in FIGS. 8 and 9, respectively, and the material of the light-refracting element 53 is exemplified by glass, FIG. It is a glass disk with a through hole, and Fig. 9 is a glass rod with a strip structure of a through hole. The photorefractive element 53 has two refractive indices, that is, the refractive index of the via region is the refractive index n1 of the air, and the other region is the refractive index n2 of the original material of the photorefractive element 53. Further, in order to rotate the light refraction element 53 at a constant speed, the through holes may be symmetrically arranged. For details, please refer to FIG. 10 and FIG. 11. FIG. 10 is a through hole respectively disposed at a position symmetric about the axis of rotation of the glass disk, and FIG. 11 is The 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 amount of shift of the light is related to the incident angle of the light, the refractive index of the light-refracting element 53, and the thickness of the light-refracting element 53, that is,

Here, Δy is the amount of shift of the light, t is the thickness of the light-refracting element 53, θ is the incident angle of the light, and n is the refractive index of the light-refracting element 53.

According to the above relationship, in the case where both t and θ are equal, when the light passes through the through hole of the light-refracting element 53 (corresponding to the region of the refractive index n1), since n1 is the refractive index of air, which is almost equal to 1, the light is along When the light is incident on the region of the refractive index n2, since n2 is the refractive index of the light-refracting element 53, which is not equal to 1, the light is shifted, and finally the corresponding light for the two regions is on the screen. The pixels of the projected image are superimposed to achieve increased resolution.

If the light-refracting element 53 has three or more regions of different resolutions, different materials or the same material may be used in different regions of the through-hole to achieve different refractive indices. For the specific setting, reference may be made to the second type described below. Setting method.

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

One of the solutions is that the regions of different refractive indices of the light-refracting elements 53 are made of different materials, which can effectively solve the problem of the balance of the light-refracting elements 53 and better solve the problem of the light-refractive elements 53 of the above-mentioned through-holes. The problem of stray light on the edges. Specifically, the light refraction element 53 may be segmented, and the light refraction element 53 is a disk structure. As shown in FIGS. 12-14, the light refraction elements 53 are respectively divided into 2 segments, 4 segments, and 8 segments. Wherein the area of each segment is preferably the same. And set the material used for each segment as needed. You can use materials with different refractive indices or materials with the same refractive index for each segment. It suffices that the material of the A refractive index is set to a specific region, where A is the number of refractive indices included in the photorefractive element 53.

For example, if the light-refracting element 53 includes two regions of different refractive indices n1 and n2, materials having refractive indices n1 and n2 may be used, as shown in FIGS. 12-14. In Fig. 12, the light-refracting element 53 is divided into two sections, and materials of refractive indices of n1 and n2 are used, respectively. In Figs. 13 and 14, the light-refracting elements 53 are respectively divided into four segments and eight segments, which alternately adopt materials of refractive indices of n1 and n2.

In this embodiment, the materials of different refractive indexes can be connected by gluing, and the gap between the materials is avoided to cause image blur. Alternatively, the materials of different refractive indices may be formed by integral molding to achieve seamless connection of materials having different refractive indices.

The above describes the settings for materials with different refractive indices. In this embodiment, different refractive indexes can be realized by using the same material. Specifically, different refractive indexes are realized by setting different thicknesses of the same material.

Referring to FIG. 5 again, in the embodiment, the controller 54 is configured to control the light source assembly 51 and the light refraction element 53 to be driven synchronously such that the source light periodically enters the light modulator 52 and is synchronized through at least two of the light refractive elements 53. The regions of different refractive indices are differently refracted to produce pixel offsets to achieve superposition of pixels. Specifically, the light source system 50 further includes a first driving device 55 for driving the fluorescent element 512 and a second driving device 56 for driving the light refractive element 53. In the present embodiment, the first driving device 55 and the second driving device 56 are preferably drive motors.

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

In the present 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, a disk shape or a strip shape. For example, the fluorescent element 512 and the light-refractive element 53 are in the shape of a disk. If the light-refracting element 53 includes two regions of different refractive indices, the second driving device 56 is controlled to drive the light-refracting element 53 to rotate one turn to control the first driving device. 55 drives the fluorescent element 512 to rotate for at least two weeks. If the period of the first driving device 55 is controlled to be 120 Hz, the period of the second driving device 56 is controlled to be 60 Hz, and the two frames of images are superimposed into one image. Similarly, if the light refracting element 53 includes four regions of different refractive indices, and then the second driving device 56 is controlled to drive the light-refracting element 53 to rotate one turn, and the first driving device 55 is controlled to drive the fluorescent member 512 to rotate for at least four weeks. In the case where it is desired to achieve the desired resolution, the synchronization of the fluorescent element 512 and the photorefractive element 53 can be satisfied by changing the rotational speed of the fluorescent element, and the synchronization of the fluorescent element 512 and the photorefractive element 53 can be satisfied by changing the photorefractive element 53. If a scheme of changing the light-refracting element 53 is employed, it is necessary to consider the segment structure on the light-refracting element 53, and if the light-refracting element 53 is disposed as in steps 2, 4, and 8 of FIGS. 12-14, the light-refracting element 53 may be disposed. The rotational speeds are 3600 rpm, 1800 rpm, and 900 rpm, respectively, so that the period of the trajectory of the emitted light is more abundant.

Further, a mark position is provided on the fluorescent element 512, and a sensor (not shown) is disposed on the side of the fluorescent element 512. A mark position is provided on the light-refracting element 53, and a sensor (not shown) is disposed on the side of the light-refracting element 53. The sensor detects the position of the fluorescent element 512 and the photorefractive element 53, and sends the position information to the controller 54, which controls the synchronization of the fluorescent element 512 and the photorefractive element 53 based on the positional information.

Therefore, the present embodiment employs the light-refracting element 53 to switch between different refractive indexes, and controls the synchronization of the fluorescent element 512 and the light-refracting element 53, so that the emitted light stays in a certain state for a long time (as shown in FIG. 15). The resulting image pixels can stay in a certain state for a long time, not only overcome the image unclear caused by the refractive index oscillation in the conventional technology, but also make the structure of the machine simpler.

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

Embodiments of the present invention also provide a display device including a light source system as described above. The display device is an educational projector, a laser television, a micro-projection or a cinema machine.

In summary, the present invention improves the resolution of an image to achieve a good user experience.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent process transformation of the present invention and the contents of the drawings may be directly or indirectly applied to other related technologies. The fields are all included in the scope of patent protection of the present invention.

Claims

A light source system, characterized in that the light source system comprises:

a light source assembly for emitting source light;

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

a light refraction element comprising at least two regions each having a different refractive index for refracting the modulated light;

a controller for controlling the light source assembly and the light refracting element to be driven synchronously such that the source light periodically enters the light modulator and is different through the at least two regions of the light refracting element Refraction to produce a pixel offset to achieve superposition of pixels.
The light source system of claim 1 wherein said light source assembly comprises:

a light source that emits excitation light;

A fluorescent element is disposed on the optical path of the excitation light for receiving the excitation light to generate the source light.
The light source system according to claim 1, wherein the light modulator is any one of a DMD, an LCD, or an LCOS.
The light source system according to claim 1, wherein at least one region of the light refraction element is a structure of a through hole, and the modulated light periodically passes through the through hole and another region to modulate the light. Perform refraction.
The light source system according to claim 1, wherein the at least two regions of the light-refracting element are each made of a solid material, and the modulated light enters the at least two regions of the physical material respectively to The modulated light is refracted.
The light source system according to claim 5, wherein the at least two regions of the light-refracting element are made of different materials, and different materials are connected by gluing or integral molding.
The light source system according to claim 5, wherein said at least two regions of said light-refracting member are made of the same material, which are realized by setting different thicknesses Different refractive indices.
The light source system according to claim 1, wherein the light refractive element has a shape of a disk, a strip or a track.
The light source system according to claim 2, wherein said light source assembly further comprises a prism for directing source light to the light modulator;

The light refraction element is disposed between the prism and the lens or between the light modulator and the prism.
The light source system according to claim 2, wherein said light source system further comprises a first driving device and a second driving device, wherein said first driving device is for driving said fluorescent element, said second driving Means for driving the light refractive element;

The controller controls the phosphor element and the light refraction element to synchronize by controlling the first driving device and the second driving device.
The light source system according to claim 10, wherein said light refractive element has M regions of different refractive indices, and said controller controls said first driving means to drive said fluorescent element to rotate at a frequency The second driving device drives at least M times the rotational frequency of the light refraction element, wherein the M is an integer greater than or equal to 2.
The light source system according to claim 11, wherein a mark position is provided on both the fluorescent element and the light-refracting element, and a sensor is disposed on one side of the fluorescent element and the light-refracting element, a sensor detects a position of the fluorescent element and the light refracting element, and transmits information of the position to the controller, the controller controlling the fluorescent element and the light refracting element according to information of the position Synchronization.
A display device, characterized in that the display device comprises the light source system according to any one of claims 1-12.