CN110876021B - Projection system and light source module thereof - Google Patents

Projection system and light source module thereof Download PDF

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Publication number
CN110876021B
CN110876021B CN201811014129.2A CN201811014129A CN110876021B CN 110876021 B CN110876021 B CN 110876021B CN 201811014129 A CN201811014129 A CN 201811014129A CN 110876021 B CN110876021 B CN 110876021B
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light
laser
array
light source
wavelength conversion
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CN110876021A (en
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徐应荣
侯海雄
李屹
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Shenzhen Appotronics Corp Ltd
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Appotronics Corp Ltd
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Priority to CN201811014129.2A priority Critical patent/CN110876021B/en
Priority to PCT/CN2019/076629 priority patent/WO2020042565A1/en
Publication of CN110876021A publication Critical patent/CN110876021A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H04N23/741—Circuitry for compensating brightness variation in the scene by increasing the dynamic range of the image compared to the dynamic range of the electronic image sensors
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/70—Circuitry for compensating brightness variation in the scene
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3141—Constructional details thereof
    • H04N9/315—Modulator illumination systems
    • H04N9/3161—Modulator illumination systems using laser light sources
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Projection Apparatus (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

The invention relates to a projection system and a light source module thereof. The projection system comprises an image signal processor, a light source module and a spatial light modulator, wherein the image signal processor converts an image digital signal into a light source modulation signal and an image modulation signal; the light source module comprises a laser array, a light uniformizing device array, a light condensing module and a wavelength conversion device; the laser array comprises a plurality of lasers which are arranged in an array, the lasers are uniformly divided into a plurality of laser groups which are arranged in an array, and the light source modulation signal is used for controlling the laser brightness of each laser group; the light uniformizing device array comprises a plurality of light uniformizing devices which are arranged in an array manner, each light uniformizing device corresponds to a laser group, and the laser emitted by the laser group is uniformized; the light-gathering module gathers the homogenized laser and transmits the laser to the wavelength conversion device; the wavelength conversion device can convert the laser into fluorescence; the spatial light modulator modulates the laser light and the fluorescence emitted from the wavelength conversion device according to the image modulation signal to generate image light.

Description

Projection system and light source module thereof
Technical Field
The invention relates to the technical field of projection display, in particular to a projection system and a light source module thereof.
Background
The dynamic range of the image is the relative ratio of the brightest value and the darkest value of the image, and the high dynamic range is beneficial to enhancing the contrast ratio of the picture and enabling the image to be clearer, so that the improvement of the dynamic range of the image is the development requirement in the technical field of the current projection display.
Currently, a projection system modulates light from a light source according to an image digital signal by a spatial light modulator, and finally outputs the modulated light to a display screen. In practical application, the spatial light modulator modulates the light beam output of the light source according to the received image digital signal, and modulates the light beam output to be completely shielded when the dark field signal is received. Although no light beam output is realized at the darkest value, the light beam irradiated on the spatial light modulator is in an excessive state, and the light beam leaks out from the gap, so that the darkest effect of the display screen cannot be achieved, the efficiency of the projection system is low, and high energy consumption is caused.
In order to improve the expressive force of dark gradation, the prior art adds a spatial light modulator before the spatial light modulator to perform modulation twice, but the brightness value of the bright part after passing through the two spatial light modulators is lost, the brightest effect cannot be achieved, and the dynamic range of the image is smaller.
Disclosure of Invention
In order to solve the technical problem of small dynamic range of images displayed by the existing projection system, the invention provides a projection system with high dynamic range, which comprises:
the image signal processor is used for converting an image digital signal input into the projection system into a light source modulation signal and an image modulation signal, wherein the light source modulation signal is a control signal for controlling the brightness of a light source generated according to a gray-scale value of an image;
the light source module comprises a laser array, a light uniformizing device array, a light condensing module and a wavelength conversion device;
the laser array comprises a plurality of lasers which are arranged in an array, the lasers are uniformly divided into a plurality of laser groups which are arranged in an array, each laser group comprises at least one laser, the lasers are used for emitting laser, and the light source modulation signals are used for controlling the laser brightness of each laser group; the light uniformizing device array comprises a plurality of light uniformizing devices which are arranged in an array manner, each light uniformizing device corresponds to one laser group, and the light uniformizing device performs light uniformizing on laser emitted by the laser group; the light-gathering module gathers the homogenized laser and transmits the laser to the wavelength conversion device; the wavelength conversion device is capable of converting the laser light into fluorescence;
a spatial light modulator that modulates the laser light and the fluorescence emitted from the wavelength conversion device according to the image modulation signal to generate image light.
In one embodiment, the light source module further includes a collimating lens array, where the collimating lens array includes a plurality of collimating lenses arranged in an array, each collimating lens corresponds to one laser, and collimates the laser emitted by the laser; the collimating lens array is located in a light path between the laser array and the light homogenizer array, or the light homogenizer array is located in a light path between the laser array and the collimating lens array.
In one embodiment, the light condensing module includes a first condensing lens, a light guiding device, and a collecting lens group, which are disposed along the light path, the laser light is focused on the light guiding device through the first condensing lens, and is guided by the light guiding device to enter the collecting lens group, and the laser light is collected by the collecting lens group and enters the wavelength conversion device.
In one embodiment, the light source module further includes a second condenser lens, and the laser light and the fluorescence emitted from the wavelength conversion device are focused into the spatial light modulator by the second condenser lens after being emitted through the collection lens group and the light guide device.
In one embodiment, the light homogenizer is a light homogenizing rod or a fly eye lens.
The invention also provides a light source module with a high dynamic range, which comprises a laser array, a light uniformizing device array, a light condensing module and a wavelength conversion device; the laser array comprises a plurality of lasers which are arranged in an array, the lasers are uniformly divided into a plurality of laser groups which are arranged in an array, each laser group comprises at least one laser, and the lasers are used for emitting laser; the light uniformizing device array comprises a plurality of light uniformizing devices which are arranged in an array manner, each light uniformizing device corresponds to one laser group, and the light uniformizing device performs light uniformizing on laser emitted by the laser group; the light-gathering module gathers the homogenized laser and transmits the laser to the wavelength conversion device; the wavelength conversion device is capable of converting the laser light into fluorescent light.
In one embodiment, the light source module further includes a collimating lens array, where the collimating lens array includes a plurality of collimating lenses arranged in an array, each collimating lens corresponds to one laser, and collimates the laser emitted by the laser; the collimating lens array is located in a light path between the laser array and the light homogenizer array, or the light homogenizer array is located in a light path between the laser array and the collimating lens array.
In one embodiment, the light condensing module includes a first condensing lens, a light guiding device, and a collecting lens group, which are disposed along the light path, the laser light is focused on the light guiding device through the first condensing lens, and is guided by the light guiding device to enter the collecting lens group, and the laser light is collected by the collecting lens group and enters the wavelength conversion device.
In one embodiment, the number of the lasers in each laser group is one, the light homogenizers are distributed in one-to-one correspondence with the lasers, and the laser light emitted by each laser is homogenized by one corresponding light homogenizer.
In one embodiment, the light homogenizer is a light homogenizing rod or a fly eye lens.
Compared with the prior art, the projection system provided by the invention can convert the image digital signal into two paths of signals: the light source module and the spatial light modulator are respectively controlled by a light source modulation signal and an image modulation signal, wherein the light source modulation signal controls the brightness of laser generated by the light source module, and the image modulation signal controls the spatial light modulator to modulate the laser and fluorescence emitted by the light source module. Therefore, the primary conversion of the image gray scale for dimming and brightening the light source module is realized through the light source modulation signal, compared with the simple modulation by using the spatial light modulator, the energy loss is avoided, the cost is lower, and the purpose of improving the dynamic range of the image is realized. In addition, the light spots formed on the wavelength conversion device are array light spots formed by a plurality of small light spots through the laser array, the light uniformizing device array and the collimating lens array, and each small light spot is independently controlled by corresponding one laser, so that the aim of controlling the light intensity of a small area in the light source is fulfilled.
Drawings
Fig. 1 is a schematic block diagram of a projection system provided by the present invention.
FIG. 2 is a schematic view of a projection system according to a preferred embodiment of the invention.
FIG. 3 is a schematic view of a projection system according to another preferred embodiment of the present invention.
Description of the main elements
Projection system 100
Image signal processor 110
Light source module 120
Spatial light modulator 130
Lens 140
Laser array 121
Dodging device array 122
Collimating lens array 123
Concentrator module 124
Wavelength conversion device 125
Laser 1211
Dodging device 1221
Collimating lens 1231
First condenser lens 1241
Light guide 1242
Collection lens group 1243
Second condenser lens 126
Light source modulation signal I1
Image modulation signal I2
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic block diagram of a projection system 100 according to the present invention. The projection system 100 includes an image signal processor 110, a light source module 120, a spatial light modulator 130, and a lens 140. The image digital signal received by the projection system 100 is calculated by the image signal processor 110 and converted into a light source modulation signal I transmitted to the light source module 1201And an image modulation signal I to the spatial light modulator 1302. The light source module 120 is used for emitting laser and modulating a signal I according to the light source1Controlling the brightness of the laser, and carrying out wavelength conversion after carrying out uniform light, collimation, focusing and collection treatment on the laserFluorescence is generated. The spatial light modulator 130 modulates the signal I according to the image2The laser light and the fluorescence emitted from the light source module 120 are modulated to generate image light. The lens 140 receives the image light and projects the image light to a predetermined position or a predetermined element (e.g., a projection screen, a wall, etc.) to display an image.
The working principle of the projection system 100 is as follows: the light source modulation signal I1The control signal is generated according to a gray-scale value of an image, and may be a current signal, a voltage signal, or the like, preferably a current signal, and the light source module 120 controls the brightness of the laser light emitted by the light source module according to the magnitude of the current, that is, controls the light emitting efficiency of the light source module according to the magnitude of the current, and increases the brightness of the laser light with the increase of the current, thereby controlling the light intensity of the laser light.
Compared with the prior art, the projection system 100 can not only modulate the signal I through the image2Controlling the spatial light modulator 130 to modulate the laser and the fluorescence emitted from the light source module 120, and converting the light source modulation signal I according to the image digital signal1To control the brightness of the laser generated by the light source module 120. Thus, the signal I is modulated by the light source1Compared with the simple modulation by using the spatial light modulator 130, the primary conversion of the image gray scale for dimming and brightness enhancement of the light source module 120 does not cause energy loss and lower cost, and simultaneously achieves the purpose of improving the dynamic range of the image.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a projection system 100 according to a preferred embodiment of the invention. The light source module 120 includes a laser array 121, a light homogenizer array 122, a collimating lens array 123, a light condensing module 124, and a wavelength conversion device 125. The laser array 121 emits the laser, the laser enters the collimating lens array 123 for collimating after being subjected to the light homogenizing treatment of the light homogenizing device array 122, and then the laser is collected by the light condensing module 124 and then enters the wavelength conversion device 125 and is excited to generate the fluorescence.
It is understood that a partial region of the wavelength conversion device 125 is covered with phosphor, the laser light incident to the phosphor region of the wavelength conversion device 125 excites the phosphor to generate the fluorescence, and the laser light incident to the non-phosphor region of the wavelength conversion device 125 may be directly reflected. Therefore, the light emitted from the wavelength conversion device 125 is a mixture of the laser light and the fluorescent light.
The laser array 121 includes a plurality of lasers 1211 arranged in an array, and in this embodiment, the lasers 1211 is specifically a laser diode and can provide emergent light with high energy density and small divergence angle. The light homogenizer array 122 includes a plurality of light homogenizers 1221 arranged in an array, specifically, the light homogenizers 1221 may be light homogenizers, in this embodiment, the light inlets and the light outlets of the light homogenizers are both square, and the aspect ratio thereof may be designed as required. Further, the light homogenizer 1221 may also be a fly-eye lens. The collimating lens array 123 includes a plurality of collimating lenses 1231 arranged in an array, and it should be noted that although the divergence angle of the emergent light of the laser 1211 is small, the cross-sectional area of the light beam is enlarged during the propagation process to reduce the brightness, so the collimating lenses 1231 are required to improve the collimation of the light beam.
Specifically, the plurality of lasers 1211 included in the laser array 121 are uniformly divided into a plurality of laser groups arranged in an array, each laser group includes at least one laser 1211, and the light source modulation signal I1For controlling the laser brightness of each of the laser groups. The number of the light uniformizers 1221 is equal to the number of the laser groups, and each light uniformizer 1221 corresponds to one laser group to uniformize the laser emitted by the laser group. For example, the laser array 121 includes 16 lasers 1211 arranged in a 4 × 4 array, each 4 lasers 1211 arranged in a 2 × 2 array is divided into a laser group, and the lasers 1211 emitted by 4 lasers in each laser group are homogenized corresponding to the same dodging device 1221. Preferably, the lasers in each laser groupThe number of the optical devices 1211 is one, that is, the number of the dodging devices 1221 is equal to the number of the lasers 1211 and is distributed in one-to-one correspondence with the lasers 1211, so that each dodging device 1221 performs dodging only for the laser generated by the corresponding one of the lasers 1211, so as to improve the dodging effect.
The number of the collimating lenses 1231 is equal to the number of the lasers 1211 and is distributed in one-to-one correspondence with the lasers 1211, so that the emergent light of each laser 1211 enters into one corresponding collimating lens 1231 to improve the collimation of the light beam. In this embodiment, the dodging device array 122 is disposed in the optical path between the laser array 121 and the collimating lens array 123, and the laser light emitted by each laser 1211 first passes through the corresponding dodging device 1221 to be dodged, and then passes through the corresponding collimating lens 1231 to be collimated.
The light-gathering module 124 includes a first light-gathering lens 1241, a light guide 1242 and a collecting lens group 1243 disposed along the light path. It can be understood that, since the light beam area of the emitted light of the laser array 121 is large, the light condensing module 124 can compress the beam cross-sectional area to facilitate the processing of the subsequent optical elements, in this embodiment, the light guiding device 1242 is an area diaphragm, the area diaphragm includes a reflection area and a transmission area, the laser light emitted by each laser 1211 enters the first condensing lens 1241 in parallel after being homogenized and collimated, and is focused on the reflection area of the light guiding device 1242 after being emitted from the first condensing lens 1241, then enters the collecting lens group 1243 after being reflected by the light guiding device 1242, and finally is collected to be incident to the wavelength conversion device 125 to excite the fluorescence. It should be noted that the light spot formed on the wavelength conversion device 125 is an array light spot composed of a plurality of small light spots, and each small light spot is independently controlled by a corresponding laser 1211, so as to achieve the purpose of controlling the light intensity of the small area in the light source.
Further, the light source module 120 further includes a second condenser lens 126, and the laser light and the fluorescence emitted from the wavelength conversion device 125 enter the second condenser lens 126 in parallel after being transmitted through the collecting lens group 1243 and the transmission region of the light guiding device 1242, so that the laser light and the fluorescence enter the spatial light modulator 130 for modulation after being focused. It should be noted that the spatial light modulator 130 may be a dmd (digital micro mirror device), an lcd (liquid Crystal display), or the like.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a projection system 100 according to another preferred embodiment of the invention. The projection system 100 shown in fig. 3 is substantially the same as the projection system 100 shown in fig. 2, except that: the collimating lens array 123 is disposed in an optical path between the laser array 121 and the light homogenizer array 122, and the laser light emitted by each laser 1211 is subjected to the collimating process by a corresponding collimating lens 1231 and then subjected to the light homogenizing process by a corresponding light homogenizer 1221. In an actual processing process, the laser is collimated and then is homogenized, so that the processing difficulty of the laser array 121 and the homogenizer array 122 can be reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (10)

1. A projection system, comprising:
the image signal processor is used for converting an image digital signal input into the projection system into a light source modulation signal and an image modulation signal, wherein the light source modulation signal is a control signal for controlling the brightness of a light source generated according to a gray-scale value of an image;
the light source module comprises a laser array, a light uniformizing device array, a light condensing module and a wavelength conversion device;
the laser array comprises a plurality of lasers which are arranged in an array, the lasers are uniformly divided into a plurality of laser groups which are arranged in an array, each laser group comprises at least one laser, the lasers are used for emitting laser, and the light source modulation signals are used for controlling the laser brightness of each laser group; the light uniformizing device array comprises a plurality of light uniformizing devices which are arranged in an array manner, each light uniformizing device corresponds to one laser group, and the light uniformizing device performs light uniformizing on laser emitted by the laser group; the light condensing module condenses the homogenized laser and emits the laser to the wavelength conversion device, and the homogenized laser forms an array light spot consisting of a plurality of small light spots on the wavelength conversion device; the wavelength conversion device is capable of converting the laser light into fluorescence;
a spatial light modulator that modulates the laser light and the fluorescence emitted from the wavelength conversion device according to the image modulation signal to generate image light.
2. The projection system of claim 1, wherein the light source module further comprises a collimating lens array, the collimating lens array comprises a plurality of collimating lenses arranged in an array, each collimating lens corresponds to one of the lasers, and the laser light emitted from the lasers is collimated; the collimating lens array is located in a light path between the laser array and the light homogenizer array, or the light homogenizer array is located in a light path between the laser array and the collimating lens array.
3. The projection system of claim 1, wherein the condensing module includes a first condensing lens, a light guiding device, and a collecting lens set disposed in an optical path, the laser light is focused on the light guiding device by the first condensing lens and guided into the collecting lens set by the light guiding device, and the laser light is collected by the collecting lens set to be incident to the wavelength conversion device.
4. The projection system of claim 3, wherein the light source module further comprises a second condenser lens, and the laser light and the fluorescence light emitted from the wavelength conversion device are focused into the spatial light modulator by the second condenser lens after being emitted through the collection lens group and the light guiding device.
5. The projection system of any of claims 1-4, wherein the light homogenizer is a light homogenizer rod or a fly eye lens.
6. A light source module is applied to a projection system and is characterized by comprising a laser array, a light uniformizing device array, a light condensing module and a wavelength conversion device; the laser array comprises a plurality of lasers which are arranged in an array, the lasers are uniformly divided into a plurality of laser groups which are arranged in an array, each laser group comprises at least one laser, and the lasers are used for emitting laser; the light uniformizing device array comprises a plurality of light uniformizing devices which are arranged in an array manner, each light uniformizing device corresponds to one laser group, and the light uniformizing device performs light uniformizing on laser emitted by the laser group; the light condensing module condenses the homogenized laser and emits the laser to the wavelength conversion device, and the homogenized laser forms an array light spot consisting of a plurality of small light spots on the wavelength conversion device; the wavelength conversion device is capable of converting the laser light into fluorescence;
the brightness of each laser group can be controlled by a light source modulation signal, and the light source modulation signal is used for generating a control signal for controlling the brightness of the light source according to the gray-scale value of the image; the laser and the fluorescence emitted by the light source module are used for being modulated by a spatial light modulator according to an image modulation signal to generate image light; the image modulation signal and the light source modulation signal are generated by converting an image digital signal input to the projection system.
7. The light source module according to claim 6, further comprising a collimating lens array, wherein the collimating lens array comprises a plurality of collimating lenses arranged in an array, each of the collimating lenses corresponds to one of the lasers, and collimates the laser light emitted from the laser; the collimating lens array is located in a light path between the laser array and the light homogenizer array, or the light homogenizer array is located in a light path between the laser array and the collimating lens array.
8. The light source module of claim 6, wherein the light converging module includes a first light converging lens, a light guiding device, and a collecting lens set disposed along the light path, the laser light is focused on the light guiding device by the first light converging lens and guided into the collecting lens set by the light guiding device, and the laser light is collected by the collecting lens set and incident on the wavelength conversion device.
9. The light source module as claimed in claim 6, wherein the number of the lasers in each of the laser groups is one, the light homogenizers are distributed in a one-to-one correspondence with the lasers, and the laser light emitted by each of the lasers is homogenized by a corresponding one of the light homogenizers.
10. The light source module according to any of claims 6-9, wherein the light homogenizer is a light homogenizing rod or a fly eye lens.
CN201811014129.2A 2018-08-31 2018-08-31 Projection system and light source module thereof Active CN110876021B (en)

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JP5445379B2 (en) * 2010-07-30 2014-03-19 セイコーエプソン株式会社 projector
CN107632487B (en) * 2013-04-20 2020-03-24 深圳光峰科技股份有限公司 Light emitting device and related light source system
US9232172B2 (en) * 2013-11-04 2016-01-05 Christie Digital Systems Usa, Inc. Two-stage light modulation for high dynamic range
CN106855679B (en) * 2015-12-08 2019-05-03 深圳光峰科技股份有限公司 Projection arrangement and its control method
CN105573036B (en) * 2016-01-11 2018-03-23 四川长虹电器股份有限公司 A kind of LASER Light Source DLP display systems and display control method
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CN108259870A (en) * 2018-03-21 2018-07-06 中国华录集团有限公司 A kind of projecting TV picture Modular Display System

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