JP2005338256A - 液晶表示装置 - Google Patents
液晶表示装置 Download PDFInfo
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- JP2005338256A JP2005338256A JP2004154691A JP2004154691A JP2005338256A JP 2005338256 A JP2005338256 A JP 2005338256A JP 2004154691 A JP2004154691 A JP 2004154691A JP 2004154691 A JP2004154691 A JP 2004154691A JP 2005338256 A JP2005338256 A JP 2005338256A
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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
- G02F1/133553—Reflecting elements
- G02F1/133555—Transflectors
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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
- G02F1/133371—Cells with varying thickness of the liquid crystal layer
-
- 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
- G02F1/13356—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
-
- 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
- G02F1/133631—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
- G02F1/1343—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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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
【解決手段】 液晶層に横電界を印加する半透過型IPS方式において、透過表示部及び暗射表示部は、透過型IPS方式と同様に偏光板41、42を全面に配置し、反射表示部には、リタデーションが2分の1波長の内蔵位相板38を形成し、かつ反射表示部の液晶層10のリタデーションを4分の1波長とすることにより、明所から暗所を含む広範な環境で反射表示が可能で、かつ広視野角で高画質の透過表示が可能となる。
【選択図】図2
Description
S2=2ExEycosδ/(Ex2+Ey2)……… (3)
S3=2ExEysinδ/(Ex2+Ey2) ………(4)
暗表示における透過率の視角特性を評価した。図10は暗表示透過率の極角依存性を示しており、異なる方位角において測定した値を併記してある。暗表示透過率は何れの方位角においても充分に低下している。比較のため、透過型IPSの暗表示透過率の極角依存性を図24に示す。図10と24を比較して明らかなように、本実施例の半透過型液晶表示装置は透過型IPSと同等の透過表示特性が得られている。
内蔵位相板を用いずに、位相板を第一の基板及び第二の基板の外側に全面に渡って配置した従来の半透過型液晶表示装置を作製した。その断面を図25に示す。内蔵位相板の代わりに、これと同じ厚さでリタデーションを有しない段差形成層47を配置した。内蔵位相板と同じリタデーションと遅相軸方向の第一の外側位相板44を、第一の基板31と第一の偏光板41の間に配置した。第二の基板32と第二の偏光板42の間に、第二の基板42に近い順に、第二の外側位相板45と第三の外側位相板46を配置した。
暗表示透過率の液晶層厚依存性に着目して、本発明の液晶表示装置と、第一の基板及び第二の基板の外側に全面に渡って位相板を配置した従来の半透過型液晶表示装置を比較した。従来の半透過型液晶表示装置の場合には、液晶層に入射する光は楕円偏光であるため液晶層によって位相差を付与され、液晶層厚変動に伴い位相差が変化すれば暗表示透過率は大きく変動する。
液晶表示装置を携帯電話等に適用する場合には、薄型軽量が要求される。液晶パネルの厚さに着目して、本発明の液晶表示装置と、第一の基板及び第二の基板の外側に全面に渡って位相板を配置した従来の半透過型液晶表示装置を比較した。ここで、液晶パネルとは、第一の偏光板と第二の偏光板のよって挟まれる部分を示す。
Claims (5)
- 第一の基板と第二の基板と液晶層とから構成され、第一の基板と第二の基板は液晶層を挟持し、第二の基板は画素電極と共通電極を有し、画素電極と共通電極との間に基板面に対して概略平行な電界を印加して液晶層を駆動し、一画素内に反射表示部と透過表示部を備え、第一の基板と第二の基板の外側に第一の偏光板と第二の偏光板を有し、第一の偏光板と第二の偏光板の透過軸は互いに直交し、第一の偏光板と第二の偏光板の透過軸の何れか一方は液晶配向方向に平行である液晶表示装置において、
反射表示部に対応する部分に位相板を有し、位相板は第一の偏光板と液晶層の間に配置されており、反射表示部の液晶層のリタデーションは4分の1波長であり、位相板のリタデーションは2分の1波長であることを特徴とする液晶表示装置。 - 液晶層はホモジニアス配向で、第一の偏光板の透過軸は液晶配向方向に平行であり、位相板の遅相軸方位角が第一の偏光板の透過軸となす角は20度以上25度以下又は60度以上75度以下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。
- 位相板を第一の基板の液晶層に近接する側に形成したことを特徴とする請求項1に記載の液晶表示装置。
- 位相板の複屈折は液晶層の2倍以上であることを特徴とする請求項3に記載の液晶表示装置。
- 位相板の複屈折は液晶層の2倍であることを特徴とする請求項4に記載の液晶表示装置。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004154691A JP4223992B2 (ja) | 2004-05-25 | 2004-05-25 | 液晶表示装置 |
US11/135,828 US7088409B2 (en) | 2004-05-25 | 2005-05-23 | Liquid crystal display apparatus |
US11/397,087 US7688406B2 (en) | 2004-05-25 | 2006-04-04 | Liquid crystal display apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004154691A JP4223992B2 (ja) | 2004-05-25 | 2004-05-25 | 液晶表示装置 |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2005338256A true JP2005338256A (ja) | 2005-12-08 |
JP4223992B2 JP4223992B2 (ja) | 2009-02-12 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2004154691A Expired - Fee Related JP4223992B2 (ja) | 2004-05-25 | 2004-05-25 | 液晶表示装置 |
Country Status (2)
Country | Link |
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US (2) | US7088409B2 (ja) |
JP (1) | JP4223992B2 (ja) |
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US7088409B2 (en) | 2006-08-08 |
US20060192912A1 (en) | 2006-08-31 |
US20050264731A1 (en) | 2005-12-01 |
US7688406B2 (en) | 2010-03-30 |
JP4223992B2 (ja) | 2009-02-12 |
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