CN100447634C - 直下式背光单元和液晶显示器 - Google Patents
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- G—PHYSICS
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- 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
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133621—Illuminating devices providing coloured light
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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
- G02F1/1333—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
- G02F1/133603—Direct backlight with LEDs
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Abstract
本发明公开了一种直下式背光单元和一种使用该直下式背光单元的液晶面板。该背光单元包括:多个发光器件,以预定角设置在基底上;光栅,以不同的衍射角衍射来自发光器件的入射光,以将入射光分离成多条彩色光束。该背光单元和该液晶显示器包括以最佳角发光的直下式光源,以提供光栅最大效率的衍射,这能够实现彩色图像,而不使用滤色器。
Description
本申请要求于2005年8月26日在韩国知识产权局提交的第10-2005-0078883号韩国专利申请的优先权,其公开通过引用全部包含于此。
技术领域
本发明涉及一种直下式背光单元和一种不包括滤色器的大尺寸液晶显示器。
背景技术
通常,液晶显示器(LCD)是用在笔记本计算机、台式计算机、LCD电视和移动通信终端中的平板显示器,不是通过本身而是通过接收来自外部源的光来形成图像的光接收装置,且除液晶面板之外还需要背光单元。背光单元安装在液晶显示器的后面,并用作光源以发光。
根据光源的布置,背光单元可分类为直下式背光单元或边光式背光单元,在直下式背光单元中,直接安装在液晶显示器下面的多个灯向液晶面板直接发光,在边光式背光单元中,安装在导光板(LGP)边缘处的灯发光且所述光被传输到液晶面板。
当使用滤色器以实现彩色图像时,光效率降低,且液晶显示器的制造成本增加。为了解决这个问题,已经提出了应用光栅而不使用滤色器以分离颜色的彩色图像形成技术。
图1示出了使用边光式背光单元的传统的液晶显示器。该液晶显示器包括光源10和将光从光源10引导至液晶面板30上的导光板15。冷阴极荧光灯(CCFL)用作光源,但是CCFL的颜色实现速率低,因此提供不了高品质图像,并不适合高分辨率的TV或监视器。导光板15成锥形以有效地引导从光源10发出的光,且均匀地分布光。
反射板20形成在导光板15的下面,以将从导光板15传输的光反射回导光板15。光栅23形成在导光板15的上表面上,以根据波长以不同的角度衍射入射的白光,以将白光分离。为了获得最大的衍射效率,以最佳的入射角使光入射是重要的,从而提高光效率。然而,难以精密地控制通过导光板15引导并入射在光栅23上的光的入射角。
从光栅23发射的彩色光通过圆柱微透镜阵列25会聚在液晶面板30上。光栅23衍射光,例如,以不同的衍射角衍射红光(R)、绿光(G)和蓝光(B),使得光入射在液晶面板30的相应像素上。液晶面板根据输入的图像信号通过导通和截止像素来控制彩色光,以形成彩色图像。扩散器35扩散通过液晶面板30形成的图像,以增大视角。
如上所述,在边光式背光单元中,难以控制光以最佳的入射角入射在光栅上。由于光通过导光板从一个方向向另一方向反射,所以不会确保光的均匀性。因此,液晶显示器的尺寸受到限制。
发明内容
本发明提供了一种具有光源的背光单元和一种不包括滤色器的大尺寸液晶显示器,该背光单元使得光以光栅的衍射效率可最大时的入射角入射在光栅上。
根据本发明的一方面,提供了一种直下式背光单元,该背光单元包括:多个发光器件,在基底上以预定角倾斜;光栅,以不同的衍射角衍射来自发光器件的入射光,以将入射光分离成多条彩色光束。
发光器件可以是发光二极管。
背光单元还可包括布置在基底上并具有以预定角倾斜的安装表面的安装单元,发光器件可安装在安装表面上。
根据本发明的另一方面,提供了一种实现彩色图像而不使用滤色器的液晶显示装置,该液晶显示装置包括:液晶面板,形成彩色图像;直下式背光单元,设置在液晶面板的下面,包括在基底上以预定角倾斜的多个发光器件和光栅,所述光栅以不同的衍射角衍射来自发光器件的入射光,以将入射光分离成多条彩色光束。
附图说明
通过结合附图详细描述本发明的示例性实施例,本发明的以上和其他特征及优点将变得更加清楚,其中:
图1是具有边光式背光单元而没有滤色器的传统的液晶显示器;
图2是根据本发明示例性实施例的具有直下式背光单元而没有滤色器的液晶显示器。
具体实施方式
参照图2,根据本发明示出性、非限制性实施例的背光单元包括:直下式发光器件105,设置在液晶面板130的下面;光栅123,根据波长以不同的角度衍射来自发光器件105的入射光。
发光器件105以预定角α设置在基底100上,因此,从发光器件105发射的大部分光以预定角入射到光栅123。为了安装相对于基底100倾斜的发光器件105,具有安装表面110a的安装单元110形成在基底100上,发光器件105安装在安装表面110a上。因此,可实现具有发光器件的背光单元,所述发光器件发射以最佳入射角入射在光栅123上的受控制的光。
发光器件105可以是但不局限于发光二极管或激光二极管。例如,发光二极管可以是白色发光二极管或发射特定波段的光的多个彩色发光二极管。当使用多个彩色发光二极管时,来自各发光二极管的彩色光被混合以形成白光,白光入射在光栅123上。
光栅123根据波长以不同的衍射角衍射入射光,从而将入射光分离成多种颜色的光。由于衍射效率根据入射光的入射角变化,所以提供最大衍射效率的最佳入射角可根据光栅123的图案变化。调整发光器件105的预定角α,以获得最佳入射角。例如,入射角α可以是30°、40°或45°,虽然本发明并不局限于这些特定的示例。当发光器件105与基底100平行设置时,从发光器件105放射地发射的光以相对于光栅123对称的角度全部入射。因此,难以将从发光器件105发射的光以最佳入射角直接引导至光栅123上。然而,当发光器件105以预定角α相对于基底100倾斜时,从发光器件105发射的一部分光以与预定角α相等的入射角入射在光栅123上。
分离成多条彩色光束例如红光(R)、绿光(G)和蓝光(B)的光通过圆柱微透镜阵列125会聚到液晶面板130的像素上。液晶面板130根据输入的图像信号通过导通和截止像素来形成图像。因为液晶面板130的构造是公知的,所以为简便起见将省略对液晶面板130的构造的描述。
通过使用扩散器135将由液晶面板130形成的彩色图像扩散来确保视角。
根据本发明的液晶显示装置使用直下式背光单元而不使用滤色器实现了彩色图像。此外,由于光源布置使用直下式背光单元向大尺寸液晶显示器供应充足的光,且光源可均匀地布置在液晶面板的后面,所以可获得具有均匀亮度的大尺寸液晶面板。
如上所述,根据本发明的背光单元和液晶显示器包括以最佳角发光的直下式光源,以提供光栅最大效率的衍射,其中,所述光栅的光栅结构能够实现彩色图像,而不使用滤色器。因此,光可容易地进入光栅,提供了使用直下式背光单元的大尺寸液晶显示器。
尽管参照本发明的示例性实施例具体示出并描述了本发明,但是本领域技术人员应理解,在不脱离如权利要求限定的本发明的精神和范围的情况下,可对本发明作出形式上和细节上的各种改变。
Claims (8)
1、一种直下式背光单元,包括:
多个发光器件,在基底上以预定角倾斜;
光栅,以不同的衍射角衍射来自所述发光器件的入射光,以将所述入射光分离成多条彩色光束,
其中,所述预定角等于所述光栅的衍射效率最大时的入射光的入射角。
2、如权利要求1所述的背光单元,其中,所述发光器件包括发光二极管。
3、如权利要求1或2所述的背光单元,还包括布置在所述基底上并具有以预定角倾斜的安装表面的安装单元,其中,所述发光器件安装在所述安装表面上。
4、一种实现彩色图像而不使用滤色器的液晶显示装置,所述液晶显示装置包括:
液晶面板,形成彩色图像;
直下式背光单元,设置在所述液晶面板的下面,包括:
多个发光器件,在基底上以预定角倾斜;
光栅,以不同的衍射角衍射来自所述发光器件的入射光,以将所述入射光分离成多条彩色光束,
其中,所述预定角等于所述光栅的衍射效率最大时的入射光的入射角。
5、如权利要求4所述的液晶显示装置,其中,所述发光器件包括发光二极管。
6、如权利要求4或5所述的液晶显示装置,还包括布置在所述基底上并具有以预定角倾斜的安装表面的安装单元,其中,所述发光器件安装在所述安装表面上。
7、如权利要求4或5所述的液晶显示装置,还包括置于所述光栅和所述液晶面板之间的圆柱微透镜阵列,以将来自所述光栅的光会聚在所述液晶面板上。
8、如权利要求4或5所述的液晶显示装置,还包括将由所述液晶面板形成的彩色图像扩散的扩散器。
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KR1020050078883 | 2005-08-26 | ||
KR1020050078883A KR20070024198A (ko) | 2005-08-26 | 2005-08-26 | 직하형 백라이트 유닛 및 이를 채용한 액정 표시장치 |
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EP (1) | EP1757976B1 (zh) |
JP (1) | JP4907265B2 (zh) |
KR (1) | KR20070024198A (zh) |
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- 2006-08-09 CN CNB2006101154214A patent/CN100447634C/zh active Active
- 2006-08-24 DE DE602006015572T patent/DE602006015572D1/de active Active
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Also Published As
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JP4907265B2 (ja) | 2012-03-28 |
KR20070024198A (ko) | 2007-03-02 |
EP1757976B1 (en) | 2010-07-21 |
DE602006015572D1 (de) | 2010-09-02 |
JP2007065658A (ja) | 2007-03-15 |
US20070047221A1 (en) | 2007-03-01 |
CN1920642A (zh) | 2007-02-28 |
US7659951B2 (en) | 2010-02-09 |
EP1757976A1 (en) | 2007-02-28 |
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