CN109407452A - 一种提高光源利用率的lcd投影光学***及投影仪 - Google Patents

一种提高光源利用率的lcd投影光学***及投影仪 Download PDF

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CN109407452A
CN109407452A CN201811364684.8A CN201811364684A CN109407452A CN 109407452 A CN109407452 A CN 109407452A CN 201811364684 A CN201811364684 A CN 201811364684A CN 109407452 A CN109407452 A CN 109407452A
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light
lcd
utilization rate
optical system
guide plate
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刘智声
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SHENZHEN TOPFOISON ELECTRONIC TECHNOLOGY Co.,Ltd.
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Shenzhen Gaoge Projection Technology Co Ltd
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    • 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
    • G03B21/2073—Polarisers in the lamp house
    • 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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/283—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising used for beam splitting or combining
    • 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
    • G02B27/28—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising
    • G02B27/286—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for polarising for controlling or changing the state of polarisation, e.g. transforming one polarisation state into another
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0051—Diffusing sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0056—Means for improving the coupling-out of light from the light guide for producing polarisation effects, e.g. by a surface with polarizing properties or by an additional polarizing 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/13362—Illuminating devices providing polarized light, e.g. by converting a polarisation component into another one
    • 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
    • G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
    • G03B21/006—Projectors using an electronic spatial light modulator but not peculiar thereto using LCD's
    • 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
    • G03B21/28—Reflectors in projection beam
    • 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
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses

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  • Optics & Photonics (AREA)
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Abstract

本发明公开一种提高光源利用率的LCD投影光学***，包括背光源、反射模组、起偏器、LCD、透镜和投影镜头，背光源发出的自然光入射反射模组，经由反射模组将自然光分解成第一P光和S光，再将S光转换成第二P光，第一P光的偏振状态和第二P光的偏振状态相同，第一P光和第二P光均再经由起偏器、LCD、透镜到达投影镜头，由投影镜头投影成像在指定区域。本发明还公开一种LCD投影仪。一种提高光源利用率的LCD投影光学***及投影仪，缩小光学***的整体体积，更方便用户使用，在背光源与起偏器之间增加反射模组将自然光分解成第一P光和S光，再将S光转换成第二P光，使更多的光线照射在LCD上，提高光源利用率。

Description

一种提高光源利用率的LCD投影光学***及投影仪
技术领域
本发明涉及投影显示技术领域，尤其涉及一种提高光源利用率的LCD投影光学***及投影仪。
背景技术
投影仪，也称为投影机，是一种将图像或视频投射到屏幕进行显示的设备，广泛应用于家庭、办公室、学校或电影院。现有的投影光学***中，通过起偏器将自然光转化成线偏振光，只有与液晶显示器(LCD)对应的偏振方向的光才能被用来投影，光源的利用率低，且现有的大多采用反光杯将光源发出的光聚集到液晶显示器(LCD)中，再通过液晶显示器(LCD)、镜头形成投影光束，采用反光杯使得整个***尺寸较大，安装不便，制造成本较高，不利于投影仪的小型化设计、批量以及规模化生产。
发明内容
本发明旨在至少在一定程度上解决相关技术中的技术问题之一。为此，本发明的一个目的是提供一种提高光源利用率的LCD投影光学***及投影仪，体积小、更方便使用。
本发明所采用的技术方案是：一种提高光源利用率的LCD投影光学***，包括背光源、反射模组、起偏器、LCD、透镜和投影镜头，所述背光源发出的自然光入射所述反射模组，经由所述反射模组将自然光分解成第一P光和S光，再将所述S光转换成第二P光，所述第一P光的偏振状态和所述第二P光的偏振状态相同，所述第一P光和所述第二P光均再经由所述起偏器、所述LCD、所述透镜到达所述投影镜头，由所述投影镜头投影成像在指定区域。
作为上述方案的进一步改进，所述背光源包括反射膜、导光板和LED灯，所述导光板设置在所述反射膜与所述反射模组之间，所述导光板将所述LED灯发出的光线导出至所述反射模组，所述反射膜将所述导光板导出的光线反射回所述导光板。
作为上述方案的进一步改进，所述反射模组包括四分之一波片和反射式偏光膜，所述背光源发出的自然光经过所述四分之一波片分解成第一P光和S光，所述S光经由所述反射式偏光膜反射回所述四分之一波片，经由所述四分之一波片、所述导光板到达所述反射膜，再经由所述反射膜再次反射至所述导光板，再经由所述四分之一波片转换成第二P光，所述第一P光和所述第二P光均依次通过所述反射式偏光膜、所述起偏器到达所述LCD。
作为上述方案的进一步改进，所述LED灯设置在所述导光板的侧面，所述LED灯发出的光线从所述导光板的侧边射入。
作为上述方案的进一步改进，所述背光源还包括扩散膜、第一增光膜和第二增光膜，所述导光板导出的光线依次通过所述扩散膜、所述第一增光膜、所述第二增光膜到达所述反射模组。
作为上述方案的进一步改进，所述背光源还包括灯罩，所述灯罩设置在所述LED灯与所述导光板之间，所述灯罩用于将所述LED灯发出的光线会聚反射至所述导光板。
作为上述方案的进一步改进，所述***还包括反射镜，所述反射镜设置在所述透镜与所述投影镜头之间，所述反射镜用于将从所述透镜出射的光线反射至所述投影镜头，再由所述投影镜头投影成像在指定区域。
作为上述方案的进一步改进，所述透镜为菲涅尔透镜。
一种提高光源利用率的LCD投影仪，所述投影仪包括如上述的提高光源利用率的LCD投影光学***。
本发明的有益效果是：
一种提高光源利用率的LCD投影光学***及投影仪，采用背光源，无需在光源与LCD之间增加反光杯，缩小光学***的整体体积，更方便用户使用，在背光源与起偏器之间增加反射模组将自然光分解成第一P光和S光，再将S光转换成第二P光，第一P光的偏振状态和第二P光的偏振状态相同，使更多的光线照射在LCD上，提高光源利用率，进而提高投影效率。
附图说明
下面结合附图对本发明的具体实施方式作进一步说明：
图1是本发明提高光源利用率的LCD投影光学***实施例结构示意图；
图2是本发明提高光源利用率的LCD投影光学***中从背光源至LCD光路示意图；
图3是本发明背光源具体实施例主视图；
图4是本发明光源具体实施例结构示意图；
图5是本发明提高光源利用率的LCD投影光学***另一实施例结构示意图。
具体实施方式
以下将结合实施例和附图对本发明的构思、具体结构及产生的技术效果进行清楚、完整的描述，以充分地理解本发明的目的、方案和效果。需要说明的是，在不冲突的情况下，本申请中的实施例及实施例中的特征可以相互组合。
需要说明的是，如无特殊说明，当某一特征被称为“固定”、“连接”在另一个特征，它可以直接固定、连接在另一个特征上，也可以间接地固定、连接在另一个特征上。此外，本发明中所使用的上、下、左、右、前、后等描述仅仅是相对于附图中本发明各组成部分的相互位置关系来说的。
此外，除非另有定义，本文所使用的所有的技术和科学术语与本技术领域的技术人员通常理解的含义相同。本文说明书中所使用的术语只是为了描述具体的实施例，而不是为了限制本发明。本文所使用的术语“及/或”包括一个或多个相关的所列项目的任意的组合。
实施例一
图1是本发明提高光源利用率的LCD投影光学***实施例结构示意图，参照图1，一种提高光源利用率的LCD投影光学***，包括背光源1、反射模组、起偏器3、LCD4、透镜5和投影镜头6，背光源1发出的自然光入射至反射模组2，经由反射模组2将自然光分解成第一P光和S光后，再将S光转换成第二P光，第一P光的偏振状态和第二P光的偏振状态相同，第一P光和第二P光均经由起偏器3、LCD4、透镜5到达投影镜头6。本实施例中，起偏器3用于吸收未转换成第二P光的S光，LCD4将P光进行调制后，由透镜5对调制后的光线进行会聚出射至投影镜头6，再由投影镜头投影成像在指定区域。
图2是本发明提高光源利用率的LCD投影光学***中从背光源至LCD光路示意图，结合图1和图2，背光源1包括反射膜100、导光板101和LED灯102，导光板101设置在反射模100与反射模组2之间，导光板101将LED灯102发出的光线导出至反射模组2，反射膜100用于将导光板100导出的光线反射回导光板101，提高了光线的利用率。
本实施例中，反射模组2包括四分之一波片201和反射式偏光膜202，背光源1发出的自然光经过四分之一波片201分解成第一P光和S光，S光经由反射式偏光膜202反射回四分之一波片201，经由四分之一波片201、导光板101到达反射膜100，再经由反射膜100再次反射至导光板101，由导光板101导出至四分之一波片201转换成第二P光，第一P光和第二P光均依次经过反射式偏光膜202、起偏器3到达LCD4，本实施例增加反射模组2将S光转换成P光后再入射至LCD4，使更多个光线入射LCD4，提高了光源利用率，进而提高投影效率。
实施例二
本实施例的目的在于说明LCD投影光学***中背光源的一优选方案。
图3是本发明背光源具体实施例主视图，参照图3，背光源包括导光板101、LED灯102,、光罩103和电路板104，其中，LED灯102安装在电路板104上，多个LED灯102设置在导光板101的侧面，LED灯102发出的光线从导光板101的侧壁射入。
本实施例中，LED灯103采用高功率LED，电路板102采用金属基板，有助于LED灯103散热。
本实施例中，在导光板101与LED灯102之间还设置有灯罩103，灯罩103将LED灯102发出的光线会聚反射至导光板101，在导光板101和LED灯102之间增加灯罩103，增加了LED灯102与导光板101之间的距离，减少LED灯102的热量对导光板101的影响，可根据实际需求调整导光板101的厚度。
实施例三
本实施例的目的在于说明LCD投影光学***中背光源的一优选方案。
图4是本发明光源具体实施例结构示意图，结合图1和图4，背光源包括反射膜100、导光板101、LED灯102、灯罩103，其中，导光板101设置在反射膜100与反射膜组2之间，LED灯102发出的光线由灯罩103会聚反射至导光板101，再由导光板101导出至反射膜组2，提高了光线的利用率。
本实施例中，背光源还包括扩散膜105、第一增光膜106和第二增光膜107，导光板101导出的光线依次通过扩散膜105、第一增光膜106、第二增光膜107到达反射模组2。扩散膜105用于调整出光角，第一增光膜106和第二增光膜107用于改变光线的行进方向，使得从扩散膜105出射的光线聚集至反射模组2的入射面，以达到增亮的效果。
实施例四
图5是本发明提高光源利用率的LCD投影光学***另一实施例结构示意图，参照图5，本实施例的投影光学***是在实施例一的投影光学***基础上增加反射镜7，反射镜7设置在透镜5和投影镜头6之间，将从透镜5发射出的光线反射至投影镜头6，再由投影镜头6投影成像在指定区域上。
实施例五
本发明还提供了一种提高光源利用率的LCD投影仪，该投影仪包括如上述实施例的LCD投影光学***。
一种提高光源利用率的LCD投影光学***及投影仪，采用背光源，无需在光源与LCD之间增加反光杯，缩小光学***的整体体积，更方便用户使用，在背光源与起偏器之间增加反射模组将自然光分解成第一P光和S光，再将S光转换成第二P光，第一P光的偏振状态和第二P光的偏振状态相同，使更多的光线照射在LCD上，提高光源利用率，进而提高投影效率。
以上是对本发明的较佳实施进行了具体说明，但本发明创造并不限于所述实施例，熟悉本领域的技术人员在不违背本发明精神的前提下还可作出种种的等同变形或替换，这些等同的变形或替换均包含在本申请权利要求所限定的范围内。

Claims (9)

1.一种提高光源利用率的LCD投影光学***，其特征在于，其包括背光源、反射模组、起偏器、LCD、透镜和投影镜头，所述背光源发出的自然光入射所述反射模组，经由所述反射模组将自然光分解成第一P光和S光，再将所述S光转换成第二P光，所述第一P光的偏振状态和所述第二P光的偏振状态相同，所述第一P光和所述第二P光均再经由所述起偏器、所述LCD、所述透镜到达所述投影镜头，由所述投影镜头投影成像在指定区域。
2.根据权利要求1所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述背光源包括反射膜、导光板和LED灯，所述导光板设置在所述反射膜与所述反射模组之间，所述导光板将所述LED灯发出的光线导出至所述反射模组，所述反射膜将所述导光板导出的光线反射回所述导光板。
3.根据权利要求2所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述反射模组包括四分之一波片和反射式偏光膜，所述背光源发出的自然光经过所述四分之一波片分解成第一P光和S光，所述S光经由所述反射式偏光膜反射回所述四分之一波片，经由所述四分之一波片、所述导光板到达所述反射膜，再经由所述反射膜再次反射至所述导光板，再经由所述四分之一波片转换成第二P光，所述第一P光和所述第二P光均依次通过所述反射式偏光膜、所述起偏器到达所述LCD。
4.根据权利要求2或3任一项所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述LED灯设置在所述导光板的侧面，所述LED灯发出的光线从所述导光板的侧边射入。
5.根据权利要求4所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述背光源还包括扩散膜、第一增光膜和第二增光膜，所述导光板导出的光线依次通过所述扩散膜、所述第一增光膜、所述第二增光膜到达所述反射模组。
6.根据权利要求4所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述背光源还包括灯罩，所述灯罩设置在所述LED灯与所述导光板之间，所述灯罩用于将所述LED灯发出的光线会聚反射至所述导光板。
7.根据权利要求1所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述***还包括反射镜，所述反射镜设置在所述透镜与所述投影镜头之间，所述反射镜用于将从所述透镜出射的光线反射至所述投影镜头，再由所述投影镜头投影成像在指定区域。
8.根据权利要求1所述的一种提高光源利用率的LCD投影光学***，其特征在于，所述透镜为菲涅尔透镜。
9.一种提高光源利用率的LCD投影仪，其特征在于，所述投影仪包括如权利要求1至8任一项所述的提高光源利用率的LCD投影光学***。
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