JP2008116731A - 液晶表示装置 - Google Patents
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- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
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- 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
- G02F1/133555—Transflectors
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133565—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements inside the LC elements, i.e. between the cell substrates
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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
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133631—Birefringent elements, e.g. for optical compensation with a spatial distribution of the retardation value
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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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133633—Birefringent elements, e.g. for optical compensation using mesogenic materials
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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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
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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
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/13—Positive birefingence
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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
- G02F2413/00—Indexing scheme related to G02F1/13363, i.e. to birefringent elements, e.g. for optical compensation, characterised by the number, position, orientation or value of the compensation plates
- G02F2413/14—Negative birefingence
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Abstract
【解決手段】反射表示部に位相差層を内蔵した半透過型IPS方式液晶表示装置において、位相差層REのリタデーションが短波長カラーフィルタと長波長カラーフィルタに対応する位相差層で互いに異なる値とする。青表示画素を短波長カラーフィルタ、赤と緑画素を長波長カラーフィルタとし、前者に対応する位相差層REのリタデーションを、後者対応よりも小さくする。
【選択図】図1
Description
位相板内蔵半透過IPS液晶表示装置の場合、反射部液晶層厚が増大するにつれて、特に、短波長域の反射率増大が顕著になる。明表示の反射率は増大できるものの、その副作用として暗表示の反射率が増大し、かつ青色に着色する。例えば、下記特許文献1には、内蔵位相板のリタデーション値を各色のカラーフィルタ毎に変えた半透過型液晶表示装置が記載されている。しかしながら、IPS方式ではないため広視野角で高コントラスト比の透過表示が得られない。
に詳細に解説されている。また、以下では、ポアンカレ球を地球に見立て、S3軸とポアンカレ球の交点を北極と南極、S1、S2平面とポアンカレ球の交線を赤道と呼ぶことにする。この場合、北極と南極が円偏光を表し、赤道が直線偏光を表し、その他の部分が楕円偏光を表す。また、S1、S2、S3軸はそれぞれ偏光状態のストークスパラメータであり、強度を表すストークスパラメータS0で規格化された値である。
Nz=(ns−nz)/(ns−nf)…………(2)
ここで、ns、nfは、それぞれ基板平面内の遅相軸方向、進相軸方向の屈折率であり、nzは、基板法線方向の屈折率である。反射表示部を構成する光学異方性媒体は反射表示部液晶層と位相差層であるが、前者はネマチック液晶であり、後者も光反応性のネマチック液晶を光重合して形成したものである。したがって、配向方向の屈折率が大きく、その垂直方向の屈折率は小さい。配向方向は基板平面内にあるため、反射表示部液晶層と位相差層のns、nf、nzは次式(3)の関係にある。
ns>nf=nz…………(3)
Nz係数は1であり、この時の反射表示部液晶層と位相差層の屈折率楕円体は図20(b)に示したように何れもラグビーボール状であり、これらの回転対称軸は基板平面方向に対して平行である。基板法線方向の屈折率は基板平面方向に比較して小さく、基板法線方向と基板平面方向の屈折率のバランスがとれていないことがわかる。視角特性を向上するには、反射表示部液晶層又は位相差層のいずれか一方について、基板法線方向の屈折率を増大しなければならない。このうち、液晶層は、液晶表示装置として動作するためには、ネマチック相でなければならないことから、変更不可能である。
ns=nz>nf…………(4)
この時の屈折率楕円体は液晶分子のメゾゲンの配向状態の影響を受けて凸レンズ状となり、図20(c)に示すように、その回転対称軸は基板平面に対して平行である。位相差層の基板法線方向の屈折率を増大したことにより、基板平面方向と基板法線方向の屈折率分布のバランスがとれる。
Claims (12)
- 第一の基板と、第二の基板と、前記第一の基板と第二の基板間に挟持された液晶層と、前記液晶層の配向状態は電界無印加時にホモジニアス配向であり、前記第一の基板の液晶層に近接する面上に形成された少なくとも3色のカラーフィルタと、前記第二の基板の液晶層に近接する面上に形成された画素電極と共通電極と、前記画素電極と共通電極は基板平面に対して平行な成分を含む電界を画素毎の液晶層に印加し、前記画素が反射層を有する反射表示部と透過表示部とからなる液晶表示装置において、
前記反射表示部には、第一の基板の液晶層に近接する面上に形成された位相差層を有し、少なくとも2色のカラーフィルタに対応する位相差層のリタデーション値が、他のカラーフィルタに対応する位相差層のリタデーション値と異なることを特徴とする液晶表示装置 - 前記カラーフィルタは、透過光の波長域に応じて短波長カラーフィルタと長波長カラーフィルタの2組に分類され、短波長カラーフィルタと長波長カラーフィルタに対応する位相差層のリタデーション値が異なることを特徴とする請求項1に記載の液晶表示装置
- 前記短波長カラーフィルタに対応する位相差層のリタデーション値は、長波長カラーフィルタに対応する位相差層のリタデーション値よりも小さいことを特徴とする請求項2に記載の液晶表示装置
- 前記カラーフィルタは、赤、緑、青の3色のカラーフィルタから構成され、赤のカラーフィルタと緑のカラーフィルタに対応する画素の位相差層のリタデーション値は等しく、この値より、青のカラーフィルタに対応する画素の位相差層のリタデーション値は小さいことを特徴とする請求項2に記載の液晶表示装置
- 前記位相差層は、光重合性の液晶分子を塗布し、光照射で重合して固体化することにより形成され、少なくとも2色のカラーフィルタに対応する位相差層は互いに光照射量が異なることを特徴とする請求項1に記載の液晶表示装置
- 前記位相差層の光照射量が、短波長カラーフィルタに対応する画素の位相差層の形成時は長波長カラーフィルタに対応する位相差層の形成時よりも少ないことを特徴とする請求項5に記載の液晶表示装置
- 前記位相差層の形成面上には、位相差層の形成に先立ち膜厚差形成層を形成し、前記膜厚差形成層の分布はリタデーション値がより小さい位相差層の分布に対応することを特徴とする請求項1に記載の液晶表示装置
- 前記カラーフィルタのうち緑に対応する位相差層のリタデーション値をRp、反射表示部の液晶層のリタデーション値をRlとすると、RpとRlはRp=1.37Rl+86の関係式で示される直線の近傍に位置することを特徴とする請求項1に記載の液晶表示装置
- 前期位相差層の遅相軸方位は、液晶層の配向方向に対し67.5度近傍の範囲の角度をなすことを特徴とする請求項1に記載の液晶表示装置
- 前記画素電極と共通電極の少なくとも一方はスリット構造又は櫛歯状構造を有し、スリットの方向又は櫛歯方向の方位は、位相差層の遅相軸と液晶層の配向方向のなす角の間にあることを特徴とする請求項9に記載の液晶表示装置
- 前記位相差層は、平盤状の分子骨格を有するディスコチック液晶から構成され、ディスコチック液晶の分子骨格のなす平面は、第一の基板の平面に対して直交することを特徴とする請求項1に記載の液晶表示装置
- 前記位相差層のNz係数は1であることを特徴とする請求項1に記載の液晶表示装置
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JP2006300357A JP4886474B2 (ja) | 2006-11-06 | 2006-11-06 | 液晶表示装置 |
US11/935,462 US7573553B2 (en) | 2006-11-06 | 2007-11-06 | Liquid crystal display device |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US7751004B2 (en) | 2007-05-01 | 2010-07-06 | Epson Imaging Devices Corporation | Liquid crystal display device and electronic apparatus |
JP4591622B2 (ja) * | 2008-03-31 | 2010-12-01 | 凸版印刷株式会社 | 位相差基板、半透過型液晶表示装置、および位相差基板の製造方法 |
JP2011043644A (ja) * | 2009-08-20 | 2011-03-03 | Dainippon Printing Co Ltd | カラーフィルタの製造方法、およびカラーフィルタを備える液晶表示装置 |
US8101249B2 (en) | 2007-02-16 | 2012-01-24 | Toppan Printing Co., Ltd. | Retardation substrate, method of manufacturing the same, and liquid crystal display |
EP2444836A1 (en) | 2010-10-25 | 2012-04-25 | Optrex Corporation | Liquid crystal display device |
US20140218669A1 (en) * | 2012-12-07 | 2014-08-07 | Boe Technology Group Co., Ltd. | Display panel and display device |
JP2018189945A (ja) * | 2017-04-28 | 2018-11-29 | 株式会社ジャパンディスプレイ | 表示装置 |
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Publication number | Priority date | Publication date | Assignee | Title |
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TWI420215B (zh) * | 2008-12-11 | 2013-12-21 | Chunghwa Picture Tubes Ltd | 顯示器 |
JP5077367B2 (ja) * | 2010-01-28 | 2012-11-21 | 凸版印刷株式会社 | 半透過型液晶表示装置用カラーフィルタ基板、その製造方法、及び半透過型液晶表示装置 |
US8736793B2 (en) * | 2010-02-24 | 2014-05-27 | Sharp Kabushiki Kaisha | Liquid crystal display panel, and liquid crystal display device |
TWI399585B (zh) * | 2010-08-10 | 2013-06-21 | Au Optronics Corp | 液晶顯示面板及彩色濾光基板 |
CN105137650B (zh) * | 2015-10-22 | 2018-11-06 | 京东方科技集团股份有限公司 | 彩膜基板、显示面板及其制备方法以及显示装置 |
CN105301832B (zh) * | 2015-11-27 | 2018-01-30 | 武汉华星光电技术有限公司 | 一种彩膜基板以及宽视角透反式液晶显示装置 |
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US7573553B2 (en) | 2009-08-11 |
JP4886474B2 (ja) | 2012-02-29 |
US20080106676A1 (en) | 2008-05-08 |
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