TWI245924B - Optical sheet, polarizer and liquid-crystal display device - Google Patents

Optical sheet, polarizer and liquid-crystal display device Download PDF

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Publication number
TWI245924B
TWI245924B TW090123160A TW90123160A TWI245924B TW I245924 B TWI245924 B TW I245924B TW 090123160 A TW090123160 A TW 090123160A TW 90123160 A TW90123160 A TW 90123160A TW I245924 B TWI245924 B TW I245924B
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Taiwan
Prior art keywords
liquid crystal
polarizers
thickness
disposed
refractive index
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TW090123160A
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English (en)
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Shuuji Yano
Yuuichi Nishikouji
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Nitto Denko Corp
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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
    • G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
    • G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
    • G02F1/1393—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/03—Viewing layer characterised by chemical composition
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
    • C09K2323/03—Viewing layer characterised by chemical composition
    • C09K2323/031—Polarizer or dye

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mathematical Physics (AREA)
  • Liquid Crystal (AREA)
  • Polarising Elements (AREA)

Description

1245924 五、發明說明（1) —-- 發明背景 1.發明範疇 本發明係有關一種光學片材’藉該光學片材設置 -尼可形式的偏光鏡間的光可於寬廣範圍的方位角=X又 除，因此形成顯示品質良好的垂直定向液晶顯示苴 觀視角及對比度絕佳。 1 〃 本案係基於日本專利申請案第2 0 0 0 — 28476〇號， 方式併入此處。 1 2 ·相關拮藝說明 即使設置成交叉-尼可形式的偏光鏡間的光於法線（正 面）方向被截除，於法線方向透射軸與吸光軸產生正交功 月b，過去一直有個問題為於觀視方位角交叉光軸時發生光 茂漏1因而茂漏光強度隨著斜向觀視角度加大而漸增。問 題顯不當偏光鏡設置於液晶元件之兩對側面上俾作為偏光 鏡及分析器因而形成液晶顯示裝置時，由於觀視方位角與 光轴異位造成光洩漏而使顯示對比度降低，發生顯示品質 低劣的缺點。 於垂直向（V A )液晶元件，其中液晶分子相對於元件基板 約為垂直定向，因此光可被透射而偏光平面極少改變，當 偏光鏡係於液晶元件之兩對側面上設置成交叉—尼可形式 日才’光容易於非操作模式於顯示面板垂直元件基板正面 (法線）方向被截除，而無需外在施加電壓，因而容易獲得 良好的背光顯示，相較於TN液晶元件等，於TN液晶元件中 液晶分子相對於元件基板為水平定向，故顯示品質容易由
1245924 五、發明說明（6) nx = ny案例。 當透明層I择 度的縮小，广、擇為不大於1 〇微米，可達成光學片材厚 可由具有前為保護偏光鏡的透明層。透明層 製成。由形成撓Iti 及適當材料以及藉適當系統 系統為佳。凹版Y 層之觀點視之，以使用有機材料塗覆 可用作為塗费系f覆、模具塗覆或浸潰塗覆等適當系統皆 另一膜上二^統、、先。也可使用轉印塗覆溶液層或塗覆膜至 由達成折射率久β 縮小之觀點視之°与ny>nz同時滿足前述膜厚度 固醇性液晶声材料佳用於形成透明層的材料係可形成膽 掌劑混合向^性^ i该層係經由膽固醇性液晶聚合物、對 成此種液晶聚合：：：i :勿二可藉光聚合或熱聚合反應形 示觀點視之，較佳^勿寺組成。特別，由達成明亮顯 見光區不具有選摆； > 成膽固醇性液晶層的材料為於可 換言之4=射特性的材料。 光，該光波長係近=層具有特徵為選擇性反射部分 圓偏振光於左及右方向之2螺軸方向之入射光波長ncP呈 此處nc為基於膽固醇性〇 :思以波長11^作為中心波長， 率，以及P為螺距 光區，則許可用來顯示的光強戶擇丄反射光區出現於可見 向系統皆可應用於形成膽：：二減低。任何適當定 如藉摩擦處理形成定向膜 f ^阳層，適當定向系統例 方法。 、 或施加電場或磁場之定向 \\312\2d-code\90-12\90123160.ptd 第10頁 1245924 五、發明說明（12) 3U例2 以貫施例1之相同方式獲得光學 製成的透明層設定為2微+ 片材之偏光鏡，但塗膜 製成。此種ή; / 晶顯示裝置係使用偏光鏡 偏丼# n 41 目位延遲器插置於液晶元件與視覺側 偏先鏡間，该相位延遲器係由具有 見 > ηζ之聚碳酸酯拉伸膜f 由率口向”性nx sny 向延遲絕對值為液其":位延遲器厚度方 如此進行控制，讓相位延遲：严；5 3對值之〇·8倍。 於液晶元件兩側上偏光鏡值與設置 和為该曰开杜p # + ^ a層之厚度方向延遲絕對值之 示裳置預定觀視方向之對比度為12。所付液晶顯 Η1 一偏光鏡係以實施例丨之相同方式獲得，但光學 二乙醯基纖維素膜替代。如此^ ^ ^ ^ ^ ^ ，、 示裝置。㈣斜觀視方向」: 輕例2 插裝置係以比較例1之相同方式形成，但阻滯膜 補广ί鏡之一與液曰曰曰元件間藉此作為液曰曰曰_示裝置的 補彳貝為，泫阻滯膜係由具有折射率各向里 < 方向延遲絕對值之0·δ倍。於預定觀視方 了 ：：,特疋載明程度說明本發明之較佳形式，但須 w〒•如後文請求專利之本發明之精髓及範圍就構 第16頁 C:\2D-mDE\90-12\90123160.ptd 1245924 五、發明說明（13) 造細節以及部件排列組合對較佳形式作出改變而未悖離本 發明之精體及範圍。 元件編號之說明 1 光學片材 2 偏光膜 3 垂直定向液晶元件 4 相位延遲器 1 1，1 3 阻滯膜 1 2，1 4 透明層 _ 21 透明保護層
C:\2D-CODE\90-12\90123160.ptd 第17頁 1245924
C:\2D-CODE\90-12\90123160.ptd 第18頁

Claims (1)

  1. 1 · 一種光學片材，包含： 一阻滯膜；以及 一透明層設置於阻滯膜之兩對側面之一上； 其中該阻滯膜具有1=(11乂_112)/(1^_1^)於0.6至09之 滞肢= i(nX-nyU於200至3 5 0毫微米之範圍’其中d為阻 d方子度，nz為2軸方向折射率，z軸方向表示阻滯膜厚产 5^^mtiz； 圭 Π 車也表不最尚於平面折射率方向，以及ην為γ 向折射率，γ軸方向表示阻滯膜之垂直ζ軸及χ二者 <方向；以及 一百 ，以及具有折射率 其中該透明層係 其中該透明層係 其中該透明層具有厚度不大於i 0微米 各向異性nx与ny > nz。 2 ·如申請專利範圍第1項之光學片材， 由有機材料塗膜製成。 3 ·如申請專利範圍第1項之光學片材， 由膽固醇性液晶層製成。 偏4光：：：層光鏡’包含申請專利範圍第1項之光學片枯與 5·如申請專利範圍第4項之偏光鏡，其中該偏光膜係設 置於光學片材之與光學片材之透明層側之相對側上，使得 该光學片材之阻滯膜的X軸方向係平行該阻滯膜之吸光于 軸0 6 · —種液晶顯示裝置，包含： 一垂直定向液晶元件；以及
    C:\ 總檔\90\90123160\90123160(替換）-l_ptc 94· 8. 30替換本
    一對申請專利範圍第5項之偏光鏡，該對偏光鏡係設置 於該元件之兩相對側上； 其中各個該對偏光鏡之透明層係設置於該元件之相對側 之對應一側上；以及 其中該對設置於該元件之兩相對側上的偏光鏡係以交叉 〜尼可形式設置。 7 ·如申請專利範圍第6項之液晶顯示裝置，其中由 Unx + ny)/2-nz}和設置於該液晶元件兩相對側上之各個該 對偏光鏡中之該透明層的層厚度之乘積所定義之厚度方向 延遲絕對值之加總值，為該液晶元件厚度方向延遲絕對值 之〇· 5倍至1. 3倍。 8 · —種液晶顯示裝置，包含： 一垂直定向液晶元件； 一對申請專利範圍第5項之偏光鏡，該對偏光鏡係以交 叉-尼可形式設置於該液晶元件之兩相對側上；以及 至少一相位延遲器設置於該液晶元件與偏光鏡之一或二 者間； 其中該相位延遲器具有折射率各向異性ηχ ~ny > nz ; 以及 其中由{(nx + ny)/2-nz}和設置於該液晶元件兩相對側上 之該等偏光鏡之各個透明層的層厚度之乘積所定義之厚度 方向延遲絕對值，與該相位延遲器厚度方向延遲絕對值之 加總值為該液晶元件厚度方向延遲絕對值之〇. 5倍至1 · 3 倍。
    __1
    C:\總檔\90\90123160\90123160(替換M.ptc 第 20 頁
TW090123160A 2000-09-20 2001-09-20 Optical sheet, polarizer and liquid-crystal display device TWI245924B (en)

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JP2000284760A JP3957257B2 (ja) 2000-09-20 2000-09-20 液晶表示装置

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JP2003029038A (ja) * 2001-07-17 2003-01-29 Nitto Denko Corp 光学フィルム、偏光板及び表示装置
KR20030079705A (ko) * 2002-04-01 2003-10-10 닛토덴코 가부시키가이샤 광학 필름 및 화상 표시 시스템
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US20050128393A1 (en) * 2003-01-23 2005-06-16 Shuuji Yano Optical film, method for producing the same, and image display
KR100498267B1 (ko) * 2003-01-28 2005-06-29 주식회사 엘지화학 포지티브 보상필름을 갖는 수직배향 액정표시장치
JP4044485B2 (ja) * 2003-05-02 2008-02-06 日東電工株式会社 光学フィルム、その製造方法、およびそれを用いた偏光板
KR100543347B1 (ko) * 2003-05-27 2006-01-20 삼성전자주식회사 광시야각 보상필름 및 이를 포함한 액정 표시장치
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JP4699783B2 (ja) * 2005-03-22 2011-06-15 富士フイルム株式会社 セルロースアシレートフィルム、偏光板および液晶表示装置
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CN113671745B (zh) * 2020-05-13 2022-12-23 京东方科技集团股份有限公司 显示面板及其制备方法、显示装置

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KR20020022612A (ko) 2002-03-27
JP2002090542A (ja) 2002-03-27
US20020034596A1 (en) 2002-03-21
US6881456B2 (en) 2005-04-19
JP3957257B2 (ja) 2007-08-15
KR100710966B1 (ko) 2007-04-24

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