Light source device and projection system

Abstract

The present application belongs to the field of projection display technology, and in particular, relates to a light source device and a projection system, wherein the light source device includes at least one light source module, an optical fiber socket structure, and a light field shaping module, wherein the light source module includes at least one projection light source and a corresponding optical fiber, wherein the optical fiber is coupled to the projection light source through a coupling lens, and the light emitted by the projection light source is incident on the optical fiber through the coupling lens, and is emitted from the light emitting end of the optical fiber; an array of optical fiber plug interfaces is formed on the optical fiber socket structure, and according to predetermined requirements, the light emitting end of at least one light source module can be adapted and assembled with the optical fiber plug interface to form an array light with a specific light distribution on the light emitting surface of the optical fiber socket structure; and the light field shaping module is arranged corresponding to the optical fiber socket structure to shape the array light emitted from the light emitting surface of the optical fiber socket structure to form projection light. The light source device of the present application improves the development efficiency of the light source.

Description

Technical Field

[0001] The present application belongs to the field of projection display technology, and in particular, relates to a light source device and a projection system. Background Art

[0002] At present, the contrast ratio that can be achieved by the projection display technology of a single-chip spatial light modulator is roughly several hundred to one to one or two thousand to one, which is far lower than the brightness resolution of the human eye. Therefore, the brightness of the projected display is not bright enough in bright areas, and the brightness in dark areas cannot be reduced, making people perceive the picture level as poor and a lot of details lost. The purpose of the high dynamic range (HDR) projection system is to increase the display brightness range so that both the bright and dark parts of the picture can display rich grayscale information, thereby greatly improving the picture effect and the audience's viewing experience. Summary of the invention

[0003] The main technical problem solved by the present application is to provide a light source device to improve the development efficiency of the light source.

[0004] In order to solve the above technical problems, a technical solution adopted in the present application is: providing a light source device, including at least one light source module, an optical fiber socket structure and a light field shaping module, the light source module including at least one projection light source and a corresponding optical fiber, the optical fiber is coupled to the projection light source through a coupling lens, the light emitted by the projection light source is incident on the optical fiber through the coupling lens, and is emitted from the light emitting end of the optical fiber; an array-distributed optical fiber socket is formed on the optical fiber socket structure, and according to predetermined requirements, the light emitting end of at least one light source module can be adapted and assembled with the optical fiber socket according to predetermined requirements to form an array light with a specific light distribution on the light emitting surface of the optical fiber socket structure; the light field shaping module is arranged corresponding to the optical fiber socket structure to shape the array light emitted from the light emitting surface of the optical fiber socket structure to form projection light.

[0005] The present application also includes a second technical solution, a projection system, which includes the above-mentioned light source device.

[0006] The beneficial effects of the present application are as follows: Different from the prior art, the light source device of the present application adopts a light source module as the light source of the projection device, each light source module is responsible for the lighting of the corresponding area, the optical fiber of the light source module is adapted and assembled with the optical fiber plug interface of the optical fiber plug structure, and the optical fiber plug structure of the embodiment of the present application can be set according to the predetermined requirements, for example, the optical fiber plug structure can be set to multiple, and multiple optical fiber plug interfaces can be arranged in an array; by adapting and assembling the optical fiber output end in the light source module with the optical fiber plug interface, the light output surface of the optical fiber plug structure can be controlled to form an array light with a specific light distribution, for example, the optical fiber output end can be controlled to select and adapt and assemble with the optical fiber plug interfaces at different positions, and an array light with different light distribution can be formed, which can meet the needs of light distribution of different configurations. In the embodiment of the present application, the optical fiber of the light source module is adapted to the optical fiber plug interface, and the installation or removal of the light source module is convenient and easy to control, and the number of light source modules can be flexibly increased or decreased. On the one hand, under the same resolution, the number of light source modules can be increased, and the number of partitions can be expanded, which can effectively improve the effect of high dynamic range projection and achieve higher contrast and color reproduction. On the other hand, due to different resolutions, the number of partitions may need to be expanded to achieve the same high dynamic range projection effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0008] Figure 1 This is a schematic structural diagram of an embodiment of a light source device of the present application;

[0009] Figure 2 This is a structural schematic diagram of an embodiment of a light source module of the present application;

[0010] Figure 3 This is a structural schematic diagram of another embodiment of the light source module of the present application;

[0011] Figure 4 This is a structural block diagram of an embodiment of the heat dissipation system of the present application.

[0012] Among them, 100, main controller; 200, light source module; 210, sub-controller; 220, first drive circuit; 230, projection light source; 231, red laser; 232, green laser; 233, blue laser; 300, fiber optic socket structure; 400, control bus; 410, expandable control interface; 500, spatial light modulator; 600, light field shaping module; 700, light; 250, total reflection optical element; 260, filter; 270, polarizer.

[0013] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] It should be noted that the descriptions of "first", "second", etc. in the embodiments of the present application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0016] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0017] In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0018] The present application provides a light source device.

[0019] Please refer to Figure 1In this embodiment, the light source device includes at least one light source module 200, an optical fiber socket structure 300 and a light field shaping module 600, wherein the light source module 200 includes at least one projection light source 230 and a corresponding optical fiber 700, the optical fiber 700 is coupled to the projection light source 230 through a coupling lens, and the light emitted by the projection light source 230 is incident on the optical fiber 700 through the coupling lens, and is emitted from the light emitting end of the optical fiber 700; an array-distributed optical fiber plug interface is formed on the optical fiber socket structure 300, and according to predetermined requirements, the light emitting end of at least one light source module 200 can be adapted and assembled with the optical fiber plug interface to form an array light with a specific light distribution on the light emitting surface of the optical fiber socket structure 300; the light field shaping module 600 is arranged corresponding to the optical fiber socket structure 300 to shape the array light emitted from the light emitting surface of the optical fiber socket structure 300 to form projection light.

[0020] The above is the core content of the embodiment of the present application. The light source module 200 is used as the light source of the projection device. Each light source module 200 is responsible for the lighting of the corresponding area. The optical fiber 700 of the light source module 200 is adapted and assembled with the optical fiber plug interface of the optical fiber plug structure 300. The optical fiber plug structure 300 of the embodiment of the present application can be set according to the predetermined requirements. For example, the optical fiber plug structure 300 can be set to multiple, and multiple optical fiber plug interfaces can be arranged in an array; by adapting and assembling the optical fiber 700 output end in the light source module 200 with the optical fiber plug interface, the light output surface of the optical fiber plug structure 300 is controlled to form an array light with a specific light distribution. For example, the optical fiber 700 output end can be controlled to select and adapt and assemble with the optical fiber plug interfaces at different positions, and an array light with different light distributions can be formed, which can meet the needs of light distribution of different configurations. In the embodiment of the present application, the optical fiber 700 of the light source module 200 is adapted to the optical fiber plug interface, and the installation or removal of the light source module 200 is convenient and easy to control, and the number of light source modules 200 can be flexibly increased or decreased. On the one hand, under the same resolution, the number of light source modules 200 can be increased and the number of partitions can be expanded, which can effectively improve the effect of high dynamic range projection and achieve higher contrast and color reproduction. On the other hand, due to different resolutions, the number of partitions may need to be additionally expanded to achieve the same high dynamic range projection effect.

[0021] In the embodiment of the present application, each light source module 200 is responsible for lighting the corresponding area. During projection display, the luminous intensity of the light source module 200 is dynamically controlled according to the peak brightness of each area of ​​the picture to achieve high-contrast display.

[0022] In the embodiment of the present application, the light-emitting surface of the optical fiber socket structure 300 is located at the focal plane of the light field shaping module 600. In the embodiment of the present application, the light field shaping module 600 includes a collecting lens; the light-emitting surface of the optical fiber socket structure 300 is located at the focal plane of the light field shaping module 600, which can maximize the optical fiber coupling efficiency. In another embodiment, the light field shaping module 600 includes a double fly-eye lens, a collecting lens, a collimating lens, and a total internal reflection lens in sequence along the light transmission direction.

[0023] In an embodiment of the present application, the light source device further includes a main controller 100, a control bus 400 and a spatial light modulator 500. The main controller 100 is electrically connected to at least one light source module 200 through the control bus 400. The main controller 100 generates a spatial light modulator 500 control signal and a light source module 200 control signal corresponding to the light source module 200 one by one according to the input video signal. The main controller 100 distributes the light source module 200 control signal to the corresponding light source module 200 through the control bus 400 to control the corresponding light source module 200 to generate the expected illumination light field brightness. The spatial light modulator 500 control signal is used to control the spatial light modulator 500 to convert the projection light into image light.

[0024] In an embodiment of the present application, the control bus 400 is provided with an expandable control interface 410, each light source module 200 is connected to the control bus 400 via the expandable control interface 410, and is connected to the main controller 100 via the control bus 400. In the embodiment of the present application, the light source module 200 is connected to the main controller 100 via the expandable control interface 410, so that as the display area changes, the number of light source modules 200 can be increased or decreased to meet the lighting of a certain area for each light source module 200. By connecting to the expandable control interface 410, the installation or removal of the light source module 200 is convenient and easy to control, and the number of light source modules 200 can be flexibly increased or decreased according to the size of the spatial light modulator 500.

[0025] In the embodiment of the present application, the main controller 100 can send a spatial light modulator control signal and a light source module control signal. The sent spatial light modulator control signal can control the spatial light modulator 500, and can be used to control the flipping of the optical spatial light modulator 500, so that the light emitted from the optical fiber plug interface reaches the spatial light modulator 500 and is discharged through the spatial light modulator 500. In the embodiment of the present application, the main controller 100 analyzes the video frame content of the playback data, and sends the current value of the projection light source 230 of each partition light source module 200 to the projection light source 230 of the light source module 200, so as to achieve the control of the illumination brightness of the projection light source 230 of the light source module 200, so that the light source module 200 generates the expected illumination light field brightness.

[0026] Specifically, in the embodiment of the present application, as shown in the figure, the light source module 200 also includes a first driving circuit 220 and a sub-controller 210. The sub-controller 210 is connected between the control bus 400 and the first driving circuit 220. The sub-controller 210 drives the projection light source 230 by controlling the first driving circuit 220.

[0027] In the embodiment of the present application, the sub-controller 210 is connected between the expandable control interface 410 and the first drive circuit 220, and the sub-controller 210 drives the projection light source 230 by controlling the first drive circuit 220. The sub-controller 210 can be used to exchange information with the main controller 100, so that the first drive circuit 220 drives the projection light source 230 according to the control signal of the light source module 200 sent by the main controller 100, so as to generate the expected brightness of the illumination light field. In the embodiment of the present application, the light source module 200 has good independence. By setting the sub-controller 210, the internal control of the control signal of the light source module 200 can be realized. The coupling degree between the light source module 200 and the main controller 100 is low, so that when the light source module 200 needs to be increased, only a line branch needs to be added to the expandable control interface 410, so that the increase or decrease of the light source module 200 is more flexible and convenient.

[0028] In the embodiment of the present application, the projection light source 230 includes three primary color lasers arranged in an array, and the light emitted by the three primary color lasers is combined by the light combining unit and then incident on the optical fiber 700 through the coupling lens. The light is combined by the light combining unit, and the light emitted by the three primary color lasers is combined to the receiving end face of the optical fiber 700. Specifically, Figure 2 As shown, in the embodiment of the present application, the three-primary color lasers include a red laser 231 , a green laser 232 and a blue laser 233 .

[0029] Specifically, in the embodiment of the present application, the light combining unit includes at least one of a wavelength light combining element, a polarization light combining element and a reflective element, so as to perform spectral light combining and / or polarization light combining on the light emitted by the three-primary color laser.

[0030] In one embodiment of the invention, Figure 2 As shown, the number of red lasers 231, green lasers 232 and blue lasers 233 is equal. In the embodiment of the present application, the wavelength combining element includes a filter 260, and the reflective element is a total reflection optical element 250. The light emitted by the three primary color lasers is spectrally combined through the total reflection optical element 250 and the filter 260.

[0031] Specifically, Figure 2As shown, each light source module 200 has M*N red lasers 231, green lasers 232, and blue lasers 233. The red laser 231 corresponds to a total reflection optical element 250. The filter 260 corresponding to the green laser 232 is red-transmitting and green-reflecting. The filter 260 corresponding to the blue laser 233 is blue-reflecting and yellow-transmitting. The red, green, and blue lights are combined by spectral light combination and then coupled into M*N optical fibers 700. The K*M*N optical fibers 700 formed by the K light source modules 200 have their output ends fixed on an optical fiber socket structure 300 with H*V optical fiber sockets. Generally, K*M*N=H*V, thereby forming an illumination light field array of H*V illumination light fields as a total array light source. Of course, the relative positions of the red laser 231, the green laser 232, and the blue laser 233 can be changed, and the appropriate filter 260 can be selected accordingly.

[0032] In another embodiment, if Figure 3 As shown, when the number of any one or two lasers is twice that of another laser, the light source module 200 includes a polarization combining element, a wavelength combining element and a reflective element. The polarization combining element includes a polarizer 270. The lasers with a larger number are first polarized by the polarizer 270, and then spectrally combined with the lasers with a smaller number. In the embodiment of the present application, the light combining unit includes a total reflection optical element 250, a filter 260 and a polarizer 270; wherein, when the number of lasers of a certain color is relatively large, the lasers of that color can be polarized by a polarizer, and then spectrally combined with other lasers.

[0033] As a preferred solution, the number of red lasers 231 is twice that of green lasers 232 or blue lasers 233, and the number of blue lasers 233 is equal to that of green lasers 232. There are 2*M*N red lasers 231, and M*N green lasers 232 or blue lasers 233, respectively. The red lasers 231 are divided into two groups of M*N, wherein one red laser 231 corresponds to a total reflection optical element 250, and the other red laser 231 corresponds to a p-transmitting and s-reflecting polarizer 270, the green laser 232 corresponds to a filter 260 that transmits red and reflects green, and the blue laser 233 corresponds to a filter 260 that reflects blue and transmits yellow, so that the two red lasers 231 are polarized and combined, and then combined with the green light and the blue light by spectral combination, and then coupled into M*N optical fibers 700.

[0034] The high-power red laser 231 generally has two light-emitting chips encapsulated therein, and the light spot imaged to the optical fiber 700 is large, and an optical fiber 700 with a large core diameter is required to couple into it. In order to reduce the diameter of the optical fiber 700, after polarization light combination using two single-chip lasers, the light spot shape at the entrance of the optical fiber 700 is cross-shaped, and a thin optical fiber 700 can be used, and the spot can be dissipated to a certain extent after polarization light combination.

[0035] Preferably, the red laser 231 is welded on the circuit board to form a single-chip red laser 231 group; the green laser 232 and the blue laser 233 are a single-chip green laser 232 group and a blue laser 233 group. In the embodiment of the present application, by welding the red laser 231 on the circuit board, the red lasers 231 can be arranged in an array to achieve better light combination.

[0036] As a preferred solution, the single-chip red laser 231 group protects 16 single-chip red lasers 231, and the red lasers 231 are arranged in 2*2*4, that is, two groups of 2*4. Each single-chip red laser 231 group contains two rows, and each row contains four red lasers 231; the single-chip green laser 232 group includes 8 green lasers 232, including 2*4 green lasers 232; the single-chip blue laser 233 group includes 8 blue lasers 233, including 2*4 blue lasers 233.

[0037] When the optical fiber is coupled to the optical path of the light source module 200, whether the position and angle of the laser and the filter 260 meet the preset optimal position and angle, or whether the position and angle of the laser and the wavelength light combining element, polarization light combining element, and reflective element meet the preset optimal position and angle will affect the optical fiber coupling efficiency. Because there will be some errors affecting the coupling efficiency when the optical fiber is coupled, such as the position error between the front convergence lens of the optical fiber 700 and the incident port of the optical fiber 700, the tilt angle of the laser, the position and angle error of the wavelength light combining element, polarization light combining element, and reflective element. In order to improve the optical fiber coupling efficiency, the light source device of the embodiment of the present application also includes an adjustment mechanism (not shown), which can be used to adjust the tilt angle and height of any one or more of the wavelength light combining element, polarization light combining element, and reflective element, so that the light spot for spectral light combining falls on the receiving end of the optical fiber 700, thereby improving the coupling efficiency. In the embodiment of the present application, the wavelength light combining element, the polarization light combining element and / or the reflective element can be adjusted up and down and / or deflected by the adjustment mechanism, and the optimal position is when the light intensity at the outlet of the optical fiber 700 is the strongest.

[0038] For the light source device of the embodiment of the present application applied to a single-chip projection system, the light source module 200 uses a group of blue lasers 233, a group of green lasers 232, and a single-chip red laser 231. When using a single-chip red laser 231, due to the small laser light emitting area, the imaging spot at the fiber coupling is small, so that a fiber 700 with a smaller core diameter can be used, which is lower in cost. For the first driving circuit 220 of the sub-array light source, two red lasers 231 can be connected in series, and their driving voltage is equal to that of the green laser 232 and the blue laser 233, so that the time-division multiplexing power drive module is easy to design.

[0039] As a preferred solution of the embodiment of the present application, Figure 4 As shown, the light source module 200 also includes a heat dissipation system 240, and the sub-controller 210 can also independently control the heat dissipation system 240 to dissipate heat for the three-primary-color lasers, so that the three-primary-color lasers all work at a stable temperature, thereby improving the working stability of the three-primary-color lasers.

[0040] Specifically, the heat dissipation system 240 of the embodiment of the present application mainly includes the TEC 241 of the red laser 231 and the fan 242. The heat dissipation system 240 of the embodiment of the present application also includes a heat dissipation management module 243, a current management module 245 and a thermistor of NTC 244. The heat dissipation management module 243 collects the operating temperature of the laser through NTC 244, and then controls the operating temperature of the laser within a certain range by adjusting the speed of the fan 242 and the power of the TEC 241.

[0041] If the light source device of the present application is applied to a three-chip projection system, the three primary colors need to be emitted simultaneously, and the current management module 245 updates the current value for each frame of the image according to the current value of the laser sent by the main controller 100, and drives each laser in the light source module 200 to generate the expected illumination light field brightness. If it is a single-chip projection system, the three primary colors need to be emitted sequentially, and the current management module 245 turns on the three primary color lasers under the control of the three primary color synchronization signal.

[0042] The embodiment of the present application also includes a projection system, which includes the above-mentioned light source device. The projection system using the above-mentioned light source device can improve the development efficiency of the backlight light source of regional dimming, and can be used in engineering projectors and movie reaction machines. During projection display, the luminous intensity of the light source module 200 is dynamically controlled according to the peak brightness of each area of ​​the picture to achieve high-contrast display, and it is easy to expand, so that it is suitable for the case of the same resolution. The number of light source modules 200 can be increased, and the number of partitions can be expanded, which can effectively improve the effect of high dynamic range projection and achieve higher contrast and color reproduction. On the other hand, due to different resolutions, the number of partitions may need to be additionally expanded to achieve the same high dynamic range projection effect.

[0043] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. All equivalent structural changes made based on the concept of the present application and the contents of the present application description and drawings, or directly or indirectly applied in other related technical fields, are included in the patent protection scope of the present application.

Claims

1. A light source device, comprising: At least one light source module, the light source module comprising at least one projection light source and a corresponding optical fiber, the optical fiber being coupled to the projection light source through a coupling lens, the light emitted by the projection light source being incident on the optical fiber through the coupling lens and being emitted from a light emitting end of the optical fiber; An optical fiber socket structure having an array of optical fiber sockets formed thereon, wherein the light emitting end of the at least one light source module can be adapted and assembled with the optical fiber sockets at different positions according to predetermined requirements, so as to form an array light with a specific light distribution on the light emitting surface of the optical fiber socket structure; as well as A light field shaping module, which is arranged corresponding to the optical fiber socket structure to shape the array light emitted from the light emitting surface of the optical fiber socket structure to form projection light; The light source device further includes a main controller, a control bus and a spatial light modulator, wherein the main controller is in electrical signal communication with the at least one light source module through the control bus, the main controller generates a spatial light modulator control signal and a light source module control signal corresponding to the light source module one by one according to the input video signal, the main controller distributes the light source module control signal to the corresponding light source module through the control bus to control the corresponding light source module to generate the expected illumination light field brightness, and the spatial light modulator control signal is used to control the spatial light modulator to convert the projection light into image light; The light source module further includes a first driving circuit and a sub-controller. The sub-controller is connected between the control bus and the first driving circuit. The sub-controller drives the projection light source by controlling the first driving circuit.

2. The light source device according to claim 1, wherein: The light-emitting surface of the optical fiber socket structure is located at the focal plane of the light field shaping module.

3. The light source device according to claim 1, wherein: The projection light source includes three-primary-color lasers arranged in an array. Light emitted by the three-primary-color lasers is combined by a light combining unit and then incident on the optical fiber through the coupling lens.

4. The light source device according to claim 3, characterized in that: The light combining unit includes at least one of a wavelength light combining element, a polarization light combining element and a reflective element, so as to perform spectral light combining and / or polarization light combining on the light emitted by the three-primary-color lasers.

5. The light source device according to claim 3, characterized in that: The three-primary color lasers include a red laser, a green laser and a blue laser, wherein the number of the red lasers is twice the number of the green lasers or the blue lasers, and the number of the blue lasers is equal to the number of the green lasers.

6. The light source device according to claim 5, characterized in that: The red laser is welded on a circuit board to form a single-chip red laser group; the green laser and the blue laser are a single-chip green laser group and a blue laser group.

7. The light source device according to claim 6, characterized in that: The single-chip red laser group includes 16 single-chip red lasers, the single-chip green laser group includes 8 green lasers, and the single-chip blue laser group includes 8 blue lasers.

8. The light source device according to claim 4, characterized in that: It includes an adjustment mechanism, which is used to adjust the inclination angle and height of any one or more of the wavelength light combining element, the polarization light combining element and the reflective element, so that the light spot after light combination by the light combining unit falls on the receiving end of the optical fiber.

9. A projection system, characterized in that: The projection system comprises the light source device according to any one of claims 1-8.

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