CN110597006B - Liquid crystal projection screen - Google Patents

Liquid crystal projection screen Download PDF

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Publication number
CN110597006B
CN110597006B CN201910915757.6A CN201910915757A CN110597006B CN 110597006 B CN110597006 B CN 110597006B CN 201910915757 A CN201910915757 A CN 201910915757A CN 110597006 B CN110597006 B CN 110597006B
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liquid crystal
plate
filter
light
optical
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CN201910915757.6A
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CN110597006A (en
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范永浩
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
    • G02F1/13318—Circuits comprising a photodetector
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/13338—Input devices, e.g. touch panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133504—Diffusing, scattering, diffracting elements
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133509—Filters, e.g. light shielding masks
    • G02F1/133514—Colour filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/133553—Reflecting elements
    • 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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • 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
    • G03B21/54—Accessories
    • G03B21/56—Projection screens
    • G03B21/567—Projection screens for colour projection

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Projection Apparatus (AREA)
  • Polarising Elements (AREA)

Abstract

The invention provides a liquid crystal projection screen, which comprises a backlight source, an inner polarizing plate, a liquid crystal plate, a light filter plate and an outer polarizing plate, wherein the inner polarizing plate is arranged on the backlight source; the polarization directions of the inner and outer polarization plates are orthogonal, and the outer surface of the outer polarization plate is provided with a diffuse reflection layer; the light filter plate is formed by tiling light filtering units, each light filtering unit comprises three light filtering filters of red, blue and green which are uniformly distributed in the circumferential direction, and each light filtering filter is opposite to a liquid crystal lattice in a liquid crystal plate; the center of the area surrounded by the three filter lenses of each filter unit is provided with an optical fiber which backwards passes through the inner polarizing plate, and the rear end of the optical fiber is connected with a closed acquisition cavity provided with an optical diffusion sheet; the collecting cavity is also internally provided with three photosensitive elements facing the optical diffusion sheet, and the lighting surface of each photosensitive element is respectively covered with three red, blue and green filters which are respectively in one-to-one correspondence with the liquid crystal lattices opposite to the red, blue and green filters; each photosensor is coupled to a liquid crystal controller of the liquid crystal panel. The projection screen can actively enhance the picture projected by the projector so as to adapt to the outdoor environment.

Description

Liquid crystal projection screen
This application is a divisional application of the patent application having application number 2017111026935 and entitled liquid crystal projection screen.
Technical Field
The invention relates to the field of photoelectric technical equipment, in particular to a projection screen.
Background
The current projection screen is a passive light-emitting type screen, which displays a projected image by diffusely reflecting light projected by a projector; in the actual use process, the projection site needs to be in a very dim environment, otherwise, the image on the projection screen is obviously diluted by ambient light, so that the projection image is blurred; for this reason, the current projection screens generally cannot be used normally in outdoor environments during the day.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a liquid crystal projection screen, which can actively enhance the image projected by a projector to adapt to the outdoor environment.
The first technical scheme adopted by the invention for solving the technical problems is as follows: the liquid crystal projection screen sequentially comprises a backlight source, an inner polarizing plate, a liquid crystal plate, a light filter plate and an outer polarizing plate from inside to outside; the polarization directions of the inner polarization plate and the outer polarization plate are mutually orthogonal, and the outer surface of the outer polarization plate is provided with a diffuse reflection layer; the light filter plate is formed by tiling light filtering units, each light filtering unit comprises three light filtering filters of red, blue and green, and each light filtering filter is opposite to a liquid crystal lattice in the liquid crystal plate; a photosensitive element is arranged between the filter lens and the liquid crystal lattice, and the projection area of the photosensitive element on the surface of the filter lens is smaller than that of the filter lens; the photosensitive element is coupled to a liquid crystal controller of the liquid crystal panel; the liquid crystal controller controls the state of each liquid crystal cell in the liquid crystal panel as follows: and determining the optical rotation angle of the liquid crystal in the liquid crystal lattice opposite to the photosensitive element according to the current signal value output by each photosensitive element, so that the optical rotation angle is in direct proportion to the current signal value.
Preferably, the diffuse reflective layer is formed of a translucent sheet.
Preferably, the front side surface of the optical filter is provided with an optical diffusion layer to eliminate shading of the photosensitive element.
Preferably, a convex lens is further arranged in front of the liquid crystal lattice, the filter lens and the photosensitive element are mutually attached, and a light through hole penetrating through the filter lens and the photosensitive element is formed in the central axis of the filter lens and the photosensitive element; the front of the filter is also provided with an optical diffusion layer, and the optical diffusion layers of the filters are mutually independent; the inner peripheral surface of the light through hole is made into a mirror surface; the focus of the convex lens is positioned in the light through hole, so that light rays emitted forwards from the liquid crystal grids are converged and reflected in the light through hole and then projected to the optical diffusion layer. Therefore, the photosensitive element can be prevented from shielding the illumination generated by the backlight source, the light energy can be saved, and the heat generation of the projection screen can be reduced.
The first technical scheme has the beneficial effects that: the three colors of red, blue and green light contained by each pixel point on the diffuse reflection layer on the outer surface of the outer polarizing plate respectively pass through the red, blue and green filter mirrors in the filter unit behind the pixel point and are respectively picked up by the photosensitive element, so that the color of each pixel point can be identified, namely the proportion of the three colors of red, blue and green light corresponding to each pixel point, and therefore, the rotating angle of liquid crystal in a liquid crystal grid which is just opposite to the red, blue and green filter mirrors in a liquid crystal panel is controlled by a liquid crystal controller, so that the light generated by the backlight source can be irradiated on the outer polarizing plate to form a picture consistent with a projection picture, namely the projection picture is actively enhanced to be suitable for projection display in an outdoor environment.
The second technical scheme adopted by the invention for solving the technical problems is as follows: the liquid crystal projection screen sequentially comprises a backlight source, an inner polarizing plate, a liquid crystal plate, a light filter plate and an outer polarizing plate from inside to outside; the polarization directions of the inner polarization plate and the outer polarization plate are mutually orthogonal, and the outer surface of the outer polarization plate is provided with a diffuse reflection layer; the light filter plate is formed by tiling light filtering units, each light filtering unit comprises three light filtering filters of red, blue and green which are uniformly distributed in the circumferential direction, and each light filtering filter is opposite to a liquid crystal lattice in the liquid crystal plate; an optical fiber is arranged in the center of a region surrounded by the three optical filters of each optical filtering unit, the optical fiber backwards penetrates through the inner polarizing plate, and the rear end of the optical fiber is connected with a closed acquisition cavity; the illumination emitted from the rear end of the optical fiber is projected on an optical diffusion sheet in the collection cavity, three photosensitive elements facing the optical diffusion sheet are further arranged in the collection cavity, and the lighting surfaces of the photosensitive elements are respectively covered with red, blue and green optical filters which are respectively in one-to-one correspondence with the liquid crystal lattices opposite to the red, blue and green optical filters; each photosensitive element is coupled to the liquid crystal controller of the liquid crystal panel; the liquid crystal controller controls the state of each liquid crystal cell in the liquid crystal panel as follows: and determining the optical rotation angle of the liquid crystal in the liquid crystal lattice corresponding to the photosensitive element according to the current signal value output by each photosensitive element, so that the optical rotation angle is in direct proportion to the current signal value.
The second technical scheme has the beneficial effects that: compared with the first technical scheme, the back of the filter is not provided with the photosensitive element, so that the illumination generated by the backlight source is not blocked by the filter completely, and the thickness of the projection screen can be obviously reduced.
Drawings
FIG. 1 is a diagram of a liquid crystal projection screen according to a first embodiment of the present invention.
FIG. 2 is a diagram of a second embodiment of the LCD projection screen.
Fig. 3 is a schematic diagram of a third embodiment of the lcd projection screen.
Fig. 4 is a schematic view of the collection chamber in the third embodiment.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
the first embodiment is as follows:
in the first embodiment shown in fig. 1, the lcd projection screen sequentially includes a backlight 1, an inner polarizer 2, a liquid crystal panel 3, a filter 4, and an outer polarizer 5 from inside to outside; the polarization directions of the inner polarization plate 2 and the outer polarization plate 5 are mutually orthogonal, and the outer surface of the outer polarization plate 5 is provided with a diffuse reflection layer 51; the light filter plate 4 is formed by tiling light filtering units, each light filtering unit comprises three light filtering filters of red, blue and green, and each light filtering filter is opposite to a liquid crystal lattice in the liquid crystal plate 3; in fig. 1, only one liquid crystal cell in the liquid crystal panel 3 and one optical filter in the filter plate 4 are shown, and the backlight 1, the inner polarizing plate 2, and the outer polarizing plate 5 are also shown only in a small portion opposite to the liquid crystal cell and the optical filter; a photosensitive element 6 is also arranged between the filter and the liquid crystal lattice, and the projection area of the photosensitive element 6 on the surface of the filter is smaller than that of the filter; the photosensor 6 is coupled to a liquid crystal controller (not shown) of the liquid crystal panel 3; the liquid crystal controller controls the state of each liquid crystal cell in the liquid crystal panel 3 as follows: and aiming at the current signal value output by each photosensitive element 6, determining the optical rotation angle of the liquid crystal in the liquid crystal lattice opposite to the photosensitive element 6, so that the optical rotation angle is in direct proportion to the current signal value.
In the liquid crystal projection screen, the diffuse reflection layer 51 is made of a translucent sheet such as a ground glass sheet or a resin sheet. The front side surface of the filter is provided with an optical diffusion layer 41 to eliminate the shadow of the photosensitive element 6; that is, the light projected forward from the backlight 1 is irradiated from the periphery of the photosensitive element 6 to the optical diffusion layer 41, is uniformly diffused in the optical diffusion layer 41, and is irradiated to the outer polarizing plate 5, so that the shadow due to the light shielding of the photosensitive element 6 is eliminated.
For the liquid crystal projection screen in the first embodiment, the red, blue and green lights contained in each pixel point on the diffuse reflection layer 51 on the outer surface of the outer polarization plate 5 respectively pass through the red, blue and green filters in the filter unit behind the pixel point and are then picked up by one of the photosensitive elements 6, so that the color of each pixel point, that is, the ratio of the red, blue and green lights corresponding to each pixel point can be identified, and therefore, the liquid crystal controller controls the rotation angle of the liquid crystal in the liquid crystal cell in the liquid crystal panel 3, which is opposite to the red, blue and green filters, so that the light generated by the backlight source 1 can be irradiated on the outer polarization plate 5 to form a picture consistent with the projection picture, that is, the projection picture is actively enhanced to be suitable for projection display in an outdoor environment.
Example two:
for the second embodiment shown in fig. 2, it is different from the first embodiment in that a convex lens 7 is further disposed in front of the liquid crystal cell, the filter and the photosensitive element 6 are attached to each other, and a light-passing hole 60 penetrating through the filter and the photosensitive element is disposed on a central axis of the filter and the photosensitive element 6; the front of the filter is also provided with an optical diffusion layer 41, and the optical diffusion layers 41 of the filters are mutually independent; the inner peripheral surface of the light through hole 60 is made into a mirror surface; the focus of the convex lens 7 is located in the light-passing hole, so that the light emitted forward from the liquid crystal cell is converged and reflected in the light-passing hole 60 and then projected to the optical diffusion layer 41. Therefore, the photosensitive element 6 can be prevented from blocking the illumination generated by the backlight 1, the light energy can be saved, and the heat generation of the projection screen can be reduced.
Example three:
for the third embodiment shown in fig. 3, the third embodiment sequentially comprises a backlight source 1, an inner polarizing plate 2, a liquid crystal panel 3, a filter plate 4 and an outer polarizing plate 5 from inside to outside; also, in fig. 3, only one liquid crystal cell in the liquid crystal panel 3 and one optical filter in the filter plate 4 are shown, and the backlight 1, the inner polarizing plate 2, and the outer polarizing plate 5 are also shown only in a small portion opposite to the liquid crystal cell and the optical filter.
The polarization directions of the inner polarization plate 2 and the outer polarization plate 5 are mutually orthogonal, and the outer surface of the outer polarization plate 5 is provided with a diffuse reflection layer 51; the light filter plate 4 is formed by tiling light filtering units, each light filtering unit comprises three light filtering filters of red, blue and green which are uniformly distributed in the circumferential direction, and each light filtering filter is opposite to a liquid crystal lattice in the liquid crystal panel 3; an optical fiber 8 is arranged in the center of a region surrounded by three filters (only two filters are shown in fig. 3, and the other filter is arranged at the back of the figure and cannot be seen), the optical fiber 8 penetrates through the inner polarizing plate 2 backwards, and the rear end of the optical fiber 8 is connected with a closed acquisition cavity 9; the illumination emitted from the rear end of the optical fiber 8 is projected on an optical diffusion sheet 91 in the collection cavity 9, three photosensitive elements 92 facing the optical diffusion sheet 91 are further arranged in the collection cavity 9, and the lighting surfaces of the photosensitive elements are respectively covered with red, blue and green filters which are respectively in one-to-one correspondence with the liquid crystal lattices opposite to the red, blue and green filters; each of the photosensitive elements 92 is coupled to a liquid crystal controller of the liquid crystal panel 3; the liquid crystal controller controls the state of each liquid crystal cell in the liquid crystal panel 3 as follows: for the current signal value outputted by each of the photosensitive elements 92, the optical rotation angle of the liquid crystal in the liquid crystal cell corresponding to the photosensitive element 92 is determined, so that the optical rotation angle is in direct proportion to the current signal value.
For the third embodiment, since no photosensitive element is disposed behind the filter, the illumination generated by the backlight 1 is not blocked by the filter at all, and the thickness of the projection screen can be reduced significantly.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, but rather as the subject matter of the invention is intended to cover all modifications, equivalents and alternatives falling within the spirit and scope of the present invention.

Claims (1)

1. A liquid crystal projection screen, comprising: the liquid crystal projection screen sequentially comprises a backlight source (1), an inner polarizing plate (2), a liquid crystal plate (3), a light filter plate (4) and an outer polarizing plate (5) from inside to outside; the polarization directions of the inner polarization plate (2) and the outer polarization plate (5) are mutually orthogonal, and the outer surface of the outer polarization plate (5) is provided with a diffuse reflection layer (51); the light filter plate (4) is formed by tiling light filter units, each light filter unit comprises three light filters of red, blue and green which are uniformly distributed in the circumferential direction, and each light filter is opposite to a liquid crystal lattice in the liquid crystal panel (3); an optical fiber (8) is arranged in the center of a region surrounded by the three filter lenses of each filter unit, the optical fiber (8) backwards penetrates through the inner polarizing plate (2), and the rear end of the optical fiber (8) is connected with a closed acquisition cavity (9); the illumination emitted from the rear end of the optical fiber (8) is projected on an optical diffusion sheet (91) in the collection cavity (9), three photosensitive elements (92) facing the optical diffusion sheet (91) are further arranged in the collection cavity (9), and the lighting surface of each photosensitive element (92) is respectively covered with three red, blue and green optical filters which are respectively in one-to-one correspondence with the liquid crystal lattices opposite to the red, blue and green optical filters; each of the photosensors (92) is coupled to a liquid crystal controller of the liquid crystal panel (3); the liquid crystal controller controls the state of each liquid crystal cell in the liquid crystal panel (3) as follows: and determining the optical rotation angle of the liquid crystal in the liquid crystal lattice corresponding to the photosensitive element (92) according to the current signal value output by each photosensitive element (92) so that the optical rotation angle is in direct proportion to the current signal value.
CN201910915757.6A 2017-11-10 2017-11-10 Liquid crystal projection screen Expired - Fee Related CN110597006B (en)

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CN109636862B (en) * 2018-11-16 2021-06-25 广州视源电子科技股份有限公司 Image processing method, system, terminal, storage medium and writing board device
CN110456607A (en) * 2019-07-05 2019-11-15 中影巴可（北京）电子有限公司 A kind of projection screen, optical projection system and projecting method
CN111427228A (en) * 2020-04-29 2020-07-17 深圳市华星光电半导体显示技术有限公司 Projection display and projection display device

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KR20060000990A (en) * 2004-06-30 2006-01-06 엘지.필립스 엘시디 주식회사 Liquid crystal display device
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CN101936459A (en) * 2009-07-02 2011-01-05 台达电子工业股份有限公司 Composite light source system
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CN107728417B (en) 2020-06-05
CN107728417A (en) 2018-02-23

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