CN101351740A - 显示装置 - Google Patents
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- 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
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- G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
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- G02F2201/34—Constructional arrangements not provided for in groups G02F1/00 - G02F7/00 reflector
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- G02F2203/023—Function characteristic reflective total internal reflection
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Abstract
本发明的目的在于提供一种高对比度的反射型显示装置。根据本发明的显示装置,其特征在于,具有:光源;具有使从所述光源入射的光透射或散射的光电变换元件的显示部;使从所述光源入射的光以规定的反射角反射的光控制单元;以及用于使被所述光控制单元反射且透过了所述光电变换元件的光,向从正面观看的观看者的视野外反射的光反射件。
Description
技术领域
本发明涉及一种显示装置,尤其涉及一种可以在整个显示区域进行高对比度的显示的显示装置。
背景技术
在反射型液晶装置中利用从反射型液晶装置的侧面一侧入射光的辅助光源已众所周知(例如,参考专利文献1)。
图1是展示如上述的反射型液晶装置的一个例子的概要的图。
如图1所示,反射型液晶装置1具有液晶面板2、LED光源30以及液晶面板2的驱动用IC电路40等。并且,液晶面板2具有:第1透明基板21、第2透明基板22、夹在第1及第2透明基板间的高分子分散型液晶4、用于密封高分子分散型液晶4的密封件26、在第1透明基板21的内侧配置的第1透明电极28、在第1透明基板21上配置的棱镜3、在第2透明基板22的内侧配置的第2透明电极27、以及在第2透明基板22的外侧配置的反射板25等。
高分子分散型液晶4,在对第1和第2透明电极间施加电压的区域X1,使光保持原样地通过(非散射模式),除了背景的由反射板导致的正反射区域以外显示黑。另一方面,高分子分散型液晶4,在不施加电压的区域X2,使光散射(散射模式),显示白。
从LED光源30向液晶面板2入射的光,在被棱镜3反射向区域X1入射时,使光保持原样地通过液晶层(非散射模式),由反射板25反射,向观看一侧射出(参照M1)。因此,在施加电压的区域X1的观看一侧观测反射光。
此外,从LED光源30向液晶面板2入射的光,在被棱镜3反射而向区域X2入射时,光由液晶层(参照P1)散射(散射模式),所以在观看一侧不能直接观测反射光(参照M2)。因此,在没有施加电压的区域X2内,在观看一侧反射光被散射而被观测到,所以呈白显示。
专利文献1:JP 2003-57645 A
发明内容
如此,前述的现有的反射型液晶显示装置,在非散射模式下,向液晶面板2入射的光作为反射光在观看一侧可以观测到。因此,前述的现有的反射型液晶显示装置,存在不能进行分明的黑显示,对比度(基于散射模式的白显示与基于非散射模式的黑显示的比)低的问题。
因此,本发明的目的在于提供一种高对比度的反射型显示装置。
根据本发明的显示装置的特征在于,具有:光源;具有使从光源入射的光透射或散射的光电变换元件的显示部;使从光源入射的光以规定的反射角反射的光控制单元;以及用于使被光控制单元反射且透过了光电变换元件的光,向从正面观看的观看者的视野外反射的光反射件。
此外,根据本发明的显示装置,优选地,反射角在30°以上75°以下。这是为了使被光控制单元反射且透过了光电变换元件的光合适地向观看者的视野外反射。
进而,根据本发明的显示装置,优选地,光电变换元件通过使从光源入射的光散射而向观看者的视野内提供散射光。构成为:在光电变换元件的非散射模式(透射模式)时不向观看者的视野内提供来自光源的光,在光电变换元件的散射模式时向观看者的视野内提供来自光源的光,以进行黑显示和白显示。
进而,根据本发明的显示装置,优选地,光电变换元件根据施加电压进行透射及散射的切换。例如,构成为:利用矩阵状配置的透明电极图案构成像素,对每个像素进行电压的施加控制,可以在显示部显示规定的图像。
进而,根据本发明的显示装置,优选地,光源从所述显示部的侧面一侧入射光,光控制单元配置于显示部的观看一侧,光反射件配置于显示部的没有配置光控制单元的另一侧。
根据本发明,在光电变换元件的非散射模式下,在观看一侧基本完全观测不到来自光源的光,所以,进行黑显示时与进行白显示时的差别变得明显,可以提供高对比度的显示装置。
附图说明
图1是展示现有的液晶显示装置的概要结构的图。
图2是本发明中的显示装置10的概要剖面图。
图3是用于说明光控制单元24的反射角θ的图。
具体实施方式
下面,参照附图说明根据本发明的显示装置。
图2是展示根据本发明的显示装置10的概要结构的图。
如图2所示,显示装置10具有液晶面板20、LED光源30以及液晶面板20的驱动用IC电路40等。并且,液晶面板20具有:第1透明基板21、第2透明基板22、夹在第1及第2透明基板间的液晶23、用于密封液晶23的密封件26、在第1透明基板21的内侧配置的第1透明电极、在第1透明基板21上配置的光控制单元24、在第2透明基板22的内侧配置的第2透明电极27、以及在第2透明基板22的外侧配置的反射板25。
第1和第2透明电极27、28在第1和第2透明基板21、22内侧呈矩阵状配置,第1和第2透明电极27、28的相交点对应液晶面板20的显示像素。
作为液晶23,采用PNLC(聚合物网络型的高分子分散型液晶)。液晶23具有在对第1和第2透明电极间施加电压的区域X1使光保持原样地通过(非散射模式),而在没有施加电压的区域X2使光散射(散射模式)的功能。
光控制单元24由具有反射角θ的棱镜构成,该反射角θ是将从侧面向液晶面板20入射的光,向与入射了光的侧面远离的方向反射的角。本实施方式中,将光控制单元24的反射角θ设定为与垂直方向成45°。
在从LED光源30向液晶面板20入射的光中,要向区域X1的部分入射的光,由光控制单元24向充分与区域X1远离的方向以反射角θ反射。如前所述,在区域X1中,液晶23为非散射模式,所以使光保持原样地通过。但是,通过后的光,由反射板25以反射角θ向更为远离的方向反射(参照L1)。因此,对于从液晶面板20的正面观看的观看者,不能观测到光,仅可观看到液晶面板20的背景色。即,区域X1呈黑显示。
此外,在从LED光源30向液晶面板20入射的光中,要向区域X2的部分入射的光,由光控制单元24向与区域X2充分远离的方向以反射角θ反射。但是,如前所述,在区域X2中,液晶23为散射模式,所以将产生散射光(参照P2)。即使向区域X2入射的光以反射角θ入射(参照L2),产生的散射光也在基本相同的区域向观看一侧射出,所以,对于从液晶面板20的正面观看的观看者,也能观测散射光。即,区域X1呈白显示。
如此,在与显示装置10中的液晶23的非散射模式对应的区域X1中,来自LED光源30的光以与垂直方向成较大的角度反射而远离,与观看者的视野偏离,所以观看者仅观测到液晶面板20的背景色,呈黑显示。并且,在与显示装置10中的液晶23的散射模式对应的区域X2中,来自LED光源30的光散射,散射光被观察者观测到,呈白显示。现有的液晶显示装置中,非散射模式和散射模式这两种模式下,在观看一侧都观测到来自光源的光。与此相对,根据本发明的显示装置10中,非散射模式下,在观看一侧基本完全观测不到来自光源的光。因此,在根据本发明的显示装置10中,进行黑显示时与进行白显示时的差别变得明显,可以提供高对比度的显示装置。
图3是用于说明光控制单元24的反射角θ的图。
图3中,L表示液晶面板20的长度,D表示液晶面板20与观看者之间的距离。
如前所述,为了在显示装置10的区域X1内进行黑显示,优选地,使由光控制单元24和反射板25反射的光,不进入从液晶面板20的LED光源一侧的正上方到与液晶面板20的与LED光源相反的一侧的端部的正上方的范围内。这里,如果设则反射角θ与之间的关系,从经验上,只要满足以下的式(1)即可。
因此,根据上述式(1)及式(2),反射角θ优选在30°以上75°以下的范围内。即,光控制单元24的反射角θ满足上述条件时,液晶23可以进行良好的黑显示,因此,可以实现高对比度的显示装置。
另外,在上述的实施方式中,说明了利用了采用PNCL的液晶面板20的显示装置10,但只要是具有可以电气性地进行非散射模式与散射模式的切换的光电变换元件的显示部,其它的显示部也可以在本发明中利用。
Claims (5)
1.一种显示装置,其特征在于,具有:
光源;
具有使从所述光源入射的光透射或散射的光电变换元件的显示部;
使从所述光源入射的光以规定的反射角反射的光控制单元;以及
用于使被所述光控制单元反射且透过了所述光电变换元件的光,向从正面观看的观看者的视野外反射的光反射件。
2.如权利要求1所述的显示装置,其特征在于:
所述反射角在30°以上75°以下。
3.如权利要求1或2所述的显示装置,其特征在于:
所述光电变换元件通过使从所述光源入射的光散射而向观看者的视野内提供散射光。
4.如权利要求1~3中任意一项所述的显示装置,其特征在于,
所述光电变换元件根据施加电压进行透射及散射的切换。
5.如权利要求1~4中任意一项所述的显示装置,其特征在于,
所述光源从所述显示部的侧面一侧入射光,所述光控制单元配置于所述显示部的观看一侧,所述光反射件配置于所述显示部的没有配置所述光控制单元的另一侧。
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JP154831/2006 | 2006-06-02 | ||
JP2006154831A JP5042531B2 (ja) | 2006-06-02 | 2006-06-02 | 表示装置 |
PCT/JP2007/061588 WO2008004402A1 (fr) | 2006-06-02 | 2007-06-01 | Dispositif d'affichage |
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CN101351740A true CN101351740A (zh) | 2009-01-21 |
CN101351740B CN101351740B (zh) | 2012-11-28 |
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US (1) | US7944524B2 (zh) |
JP (1) | JP5042531B2 (zh) |
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WO (1) | WO2008004402A1 (zh) |
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WO2021077356A1 (zh) * | 2019-10-24 | 2021-04-29 | 京东方科技集团股份有限公司 | 显示面板、显示装置及显示面板制造方法 |
CN113646823A (zh) * | 2019-04-16 | 2021-11-12 | 株式会社日本显示器 | 显示装置 |
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BRPI1009425A2 (pt) * | 2009-05-18 | 2016-03-01 | Sharp Kk | substrato de matriz ativa e dispositivo de display de cristal líquido que utiliza o mesmo |
KR101091348B1 (ko) * | 2010-07-09 | 2011-12-07 | 엘지이노텍 주식회사 | 퀀텀 도트를 이용한 도광판과 그의 제조 방법, 및 백라이트 유닛 |
US9164219B2 (en) | 2011-11-14 | 2015-10-20 | Nano-Optic Devices, Llc | Frontlight unit for reflective displays |
US8596846B2 (en) | 2012-03-16 | 2013-12-03 | Nano-Optic Devices, Llc | Frontlight unit for enhancing illumination of a reflective display |
JP6877910B2 (ja) | 2016-08-01 | 2021-05-26 | 株式会社ジャパンディスプレイ | 表示装置 |
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US5099343A (en) * | 1989-05-25 | 1992-03-24 | Hughes Aircraft Company | Edge-illuminated liquid crystal display devices |
JP2651088B2 (ja) * | 1992-08-28 | 1997-09-10 | スタンレー電気株式会社 | 液晶表示パネル |
JPH10206848A (ja) * | 1997-01-27 | 1998-08-07 | Seiko Epson Corp | 液晶表示装置及びそれを用いた電子機器 |
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JP2003057645A (ja) | 2001-08-10 | 2003-02-26 | Citizen Watch Co Ltd | 液晶表示装置 |
JP2003202568A (ja) * | 2001-10-24 | 2003-07-18 | Sharp Corp | 導光体およびその製造方法、面状光源装置、表示装置 |
JP2005300560A (ja) * | 2002-02-22 | 2005-10-27 | Mitsuteru Kimura | ディスプレイ装置 |
US7268840B2 (en) * | 2003-06-18 | 2007-09-11 | Citizen Holdings Co., Ltd. | Display device employing light control member and display device manufacturing method |
JP2005062541A (ja) * | 2003-08-14 | 2005-03-10 | Alps Electric Co Ltd | 光学部材及びその製造方法並びに面発光装置及び液晶表示装置 |
-
2006
- 2006-06-02 JP JP2006154831A patent/JP5042531B2/ja not_active Expired - Fee Related
-
2007
- 2007-06-01 CN CN2007800009979A patent/CN101351740B/zh not_active Expired - Fee Related
- 2007-06-01 WO PCT/JP2007/061588 patent/WO2008004402A1/ja active Application Filing
- 2007-06-01 US US12/067,282 patent/US7944524B2/en not_active Expired - Fee Related
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN113646823A (zh) * | 2019-04-16 | 2021-11-12 | 株式会社日本显示器 | 显示装置 |
WO2021077356A1 (zh) * | 2019-10-24 | 2021-04-29 | 京东方科技集团股份有限公司 | 显示面板、显示装置及显示面板制造方法 |
Also Published As
Publication number | Publication date |
---|---|
CN101351740B (zh) | 2012-11-28 |
JP5042531B2 (ja) | 2012-10-03 |
US20090135334A1 (en) | 2009-05-28 |
US7944524B2 (en) | 2011-05-17 |
WO2008004402A1 (fr) | 2008-01-10 |
JP2007322889A (ja) | 2007-12-13 |
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