TW200604B - - Google Patents

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TW200604B
TW200604B TW081101755A TW81101755A TW200604B TW 200604 B TW200604 B TW 200604B TW 081101755 A TW081101755 A TW 081101755A TW 81101755 A TW81101755 A TW 81101755A TW 200604 B TW200604 B TW 200604B
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Taiwan
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liquid crystal
degrees
value
display device
compensation layer
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TW081101755A
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Philips Nv
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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
    • G02F1/1347—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells
    • G02F1/13471—Arrangement of liquid crystal layers or cells in which the final condition of one light beam is achieved by the addition of the effects of two or more layers or cells in which all the liquid crystal cells or layers remain transparent, e.g. FLC, ECB, DAP, HAN, TN, STN, SBE-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
    • G02F1/133636—Birefringent elements, e.g. for optical compensation with twisted orientation, e.g. comprising helically oriented LC-molecules or a plurality of twisted birefringent sublayers
    • 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
    • G02F1/1396—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 liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell

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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)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)

Description

A6 B6 200604 五、發明説明（/ ) {請先聞讀背面之注意事項具填寫本页) 本發明係有關於一液晶顯示裝置具有兩槿化器之間的 一第一液晶胞格其姐成包括有具一扭轉角度<6 i及厚度 (^的一扭轉碟狀液晶層的液態結晶材料，對具中心波長λ 。的入射光而言其光路徑長度差為cK.Am，所述顧示裝置 之組成更包括有在相反方向具一扭轉角度的一補償層 的光異向性材料。 此種型式的顯示装置係被應用於諸如投影電視的範圍 之中。差值Δη係為普通及異常波的折射係數差。 •打* 一種上面所說明型式的顯示装置係已知於美國專利 US-P-4, 44 3,065號案中。利用此種裝置，在扭轉碟狀液晶 顯示裝置中的干擾作用利用具有最好為相同扭轉角度與相 同光路徑長度差的一第二扭轉碟狀液晶胞格即可盡可能地 予以消除。值得注意的是上述的條件常會對製造過程施加 嚴格的要求，因為當在兩胞格内應用一相同的液體（相同 的Δη)時所能容許的兩複合的胞格的厚度只有相當小的容 許度。 •綠· 在具有大的扭轉角度4的液晶顯示装置中的干擾作用 會更大。對此類裝置的相同解決方式為兩胞格具備不相等 的必α與必2,其中扭轉角及相關的d-Δη值被給予一個最 佳的闞係。不過，由於這些是被動式的顯示裝置，此種最 佳的RS係調整會在驅動特性上達到（特別是一個陡峭的傳 输值/電壓特性曲線），但高的對比則無法達到（保持限制 在約10 : 1的範圍）。 因此，本發明的一目的係在於提供一種前面介紹文字 甲 4 (210X297 公爱) A6 B6 200604 五、發明説明（> > {請先聞讀背面之注意事項再填寫本页) 中的型式的顧示裝置可供投影電視使用且能達到高的對比 效果。本發明的另一目的係在於提供這樣的一種裝置其對 於製造生產時的補償層的厚度的容許度只為次要的要求。 最後，本發明的一目的係在於提供一種具有不同的扭轉角 度0α且只需要一種補償胞格的的顯示装置。 為達此目的，依據本發明的一種顯示装置之特徴為扭 轉角度係在65度至115度之間且第一液晶胞格的 △ ηι/λ〇值係依固奇塔瑞極值（Gooch & Tarry extremuffl)所決定，而補償層的扭轉角則在-115度至 -65度之間，而其<12.Λη2/λ。值係依與第一胞格的固奇 塔瑞極值所決定。 -打. 在此固奇塔瑞極值（Gooch & Tarry extremum)係表示 具有扭轉角度90度的一扭轉碟狀液晶胞格所導得的傳输值 (transmission T)的最小值（在平行的極化器的情況下） 或最大值（在互相垂直的極化器的情況下），由固奇與塔瑞 兩人於J. Phys.，D8, 1575 (1975)中所發表的。更一般 性而言，此相當的函數係由E. P. Raynes於Mol. Cryst. Liq. Cryst. Lett. 4, 69 (19δ7)中作為極化狀態的函數 所導得的。 *線. 已經知道的是利用此種厚度的選擇Μ及每一胞格的雙 折射性，此些值可選擇調整到逹到最佳的對比特性，特別 是當液晶胞格的導引器之半在無電壓狀態下κ實質上直角 的角度延伸補償層的導引器之半之處時。 兩個極化器之間的角度最好為90度。這樣便可使可能 甲 4 (210X297 公沒） 200604 A6 B6 五、發明說明（>) 已失效的顯示點由於連接的開路的闞係而為可看得見的黑 點，這比這些失效點成為可見的光點（一單一的胞格在兩 交叉的極化器之間）要較為不具干擾性。 由於較高的槿值的d.Δη值在應用相同的液體時（因 而為相同的Δη)可能相對大得許多，因此可在Δη保持相 等時選擇較大的厚度，Μ便在製造補償層時所需維持的條 件可Κ較為不嚴格（厚度變化，製造條件）。在另一方面 則可應用一多用補償層，例如，具有此種厚度的一扭轉器 可具有第二或第三固奇塔瑞極值。本發明的這些及其他的 觀念配合附圖將予詳细說明，附圖中， 圖1顯示依據本發明的一装置的圖解横截面， 圖2圖示第一胞格不同的角度Φ與d.Δη,傳输值作為 補償層的d.Δη值的函數， 圖3圖示此棰装置的傳输值作為波長的函數於兩不同 調整值時的曲線. 圖1中的顯示裝置係由具有在兩透明支持板2,3之間 具正介電異向性的一層液態结晶材料11的一第一顯示胞格 10所構成。在液態结晶材料的一側，電極12 ,13所界定的 —個顯示點的矩陣被提供於支持板2,3之上。此些顯示點 可用開闞元件與驅動電極（主動式驅動）加Μ驅動；或者 ，埴些顯式點亦可利用直條形電極的重叠而界定，並可直 接供Κ選擇訊號與資料訊號（被動式驅動）。此驅動罨壓 係利用，例如，可將進入的資訊8 ( TV信號，有關於資料 圖形圖樣等的資訊）轉換成為所述驅動信號並羥由連線 甲 4(210X297 公沒） (請先《讀背面之注意事項再填寫本页) •装· •打· •線· 5 2〇〇6〇4 A6 B6 五、發明说明（f) 15供應給電極12,13的驅動電路7而獲得。在此實例中亦 用作為導向層的絕緣材料曆14則出現在12 ,13層之上。層 14在電極.12,13的兩端的0伏電壓給予液晶分子一個扭轉 角度彡i (例如，90度）。 此装置更包拮有一補償層，在此實例中更包括有在兩 透明支持板3,4之間亦具正介電異向性的一第二層的液態 結晶材料21的一第二補償層，支.持板3係為兩胞格10,20 而選擇的。作為導向層的絕緣材料層24則出現在支持板 3,4之上。液晶材料21及層24的導向作用的選定可使液晶 分子得到相對於<6 i的一個扭轉角度<62。胞格10,20出 現在兩互相垂直交叉的極化器5及6之間。層24的壁導向 的選定可使胞格10的中心内的導引器垂直於胞格20的中心 内的導引器。 依據本發明，厚度（^及心以及八^和^^的選定可使 d.An/λ。的關連值相關連於不同的固啟塔瑞極值。此些 值亦與所選定的扭轉角度0有關，下面是約在70度至110 度之間的數值： {請先《讀背面之注意事項再填寫本百) .装· •打· ♦ 甲 4 (210X297X^1) 2〇〇β〇4 Α6 Β6 五、發明説明（f) Φ (度） 1 度 G&T -ext. 2度 G&T -ext. 3度 G&T -ext. 4度 G&T -ext. 65-75 .65-.75 1.60-1.70 2.55-2.65 3.45~3.65 75-85 .75-.85 1.70-1.80 2.65-2.75 3.60-3.80 85-95 .85-.95 1.90-2.00 2 * 9 5 ~ 3.0 5 3.90-4.10 95-105 .90-1.00 2.10-2.20 3.15-3.25 4.15-4.35 105-115 1.00-1.10 2.15-2.25 3,25-3,35 4.25-4.45 圖2顯 度）及d . △ 0.873)而作 胞格或一補 比出現如此 第二胞格的 示傳输值如何 Πΐ/λο值（相 為（Ιζ.Δ riz/di 倌層的較高固 低的傅输值。 較不精確的程 高對比的道理參考圖 有第一及第二胞格的第一 △ η值的 波長變動的 達到的高度 雙胞格的兩種 情況。圖中清 對比。 随不同 當於第 .Δ η 1 奇塔瑞 這能在 序控制 3即可 及第二 驅動電 楚顯示 的0 (70度 一固奇塔瑞 的函數而改 極值之下亦 較高的〇12值 變得足Μ滿 解釋，圖3 極值中的0 壓（1.0及5. 在一大的波 ,9 0度及11 0 極值的0 . 7 0及 變。另在第二 能在良好的對 時達到，使得 足需要。 中顯示前述具 1 = - 0 2 與 d ° 〇伏）下傳输隨 長範圍所能夠 (請先閎讀背面之注意事項再填寫本頁) h 甲 4(210X297 公沒） 7 A6 B6 五、發明説明（& ) 本發明當然不受限於這理所描述的實例的範圍之内， 而能在本發明的範赌内作成多種的變化。例如.在第一胞 格的一側可另行選擇較高的棰值，而補償器的d.Δη值被 選定為，比如，第一極值.已有發現在此情況下亦可採用 一通用的補償器，例如，其炎2 = 90度，而ό.Δη/λο = 0.70,不受炎i值影響.若不用一液晶胞格則另亦可採 用萡膜作為一補倌層.此萡膜係，例如，利用液態结晶的 聚體在其材料為碟狀液晶的溫度下給予所需的4及 d.A .η值並再接著將之固定，比如利用冷凍或UV紫外線照 射處理。 第二層21另可具有負的介電異向性，而非正的介電異 向性。 如前面已有注意到的，並不需一定要相等（絕對值） 0 —個投影顯示裝置可具有一或多個的此種型示的装置 ，其中一中心波長λ〇(例如，550nm)的d.An值被調整成 三種不同波長的最佳值。 (請先聞讀背面之注意事項再填寫本页) •St· .打. •緣· 甲 4(210X297 公沒)

Claims (1)

  1. 申請專利範面 1 · 一種液晶顙示裝置，具有置於兩極化器之間的一第一液 晶胞格其组成包括有具一扭轉角度及厚度di的一扭 轉碟狀液晶層的液態结晶材料，對具中心波長λ。的入 射光而言其光路徑長度差為（Κ.Ληι，所述顯示裝置之組 成更包括有在相反方向具一扭轉角度02的一補償層的 光異向性材料，其特徵為扭轉角度係在65度至115 度之間且第一液晶胞格的值係依固奇塔瑞 極值所決定，而補償層的扭轉角办2則在-U5度至-65 度之間，而其〇Ι2.Λη2/λ〇值係依與第一胞格的固奇塔 瑞極值所決定。 2 . 根據申請專利範圍第1項之液晶顯示装置，其中各極化 器互相垂直互相横切過。 3 . 根據申請專利範圍第1項之液晶顯示裝置，其中補償層 具有較第一液晶胞格為高的固奇塔瑞極值。 4 根據申請專利範圍第1項之液晶顯示裝置，其中補償層 係由一液態結晶材料所構成，且第一液晶胞格的導引器 之半在無電壓狀態下Μ實質上直角的角度延伸補償層的 導引器之半之處。 & 根據申請專利範圍第1項之液晶顗示装置，其中第一液 晶胞格或補償層具有65度至75度之間的扭轉角且d.A η/λ 〇 值為 0.65 至 0.75 或 1.60 至 1.70 或 2.55 至 2.65 或 {請先閱讀背面之注意事項再填穽本頁) .裝. .打. •線. 經濟部中央橾準局印製 液 1 △ 第 d 中且 其角.轉 置扭 装的 示間 顯之 晶度 液85 ~之至 項度 5 1 7 第有 圍具 範層 。利償 65專補 3.請或 至申格 45據胞 3.根晶 & f 4 (210X297公尨） 200604 經濟部中央標準局印装 Α7 Β7 C7 D7 /、、申請專利範面 η/λ 〇 值為 0.75 至 0.85 或 1.70 至 1.80 或 2.65 至 2.75 或 3.60至 3.80 ° 7· 根據申請專利範圍第1項之液晶顧示装置，其中第一液 晶胞格或補償層具有85度至85度之間的扭轉角且d.A η/λ 〇 值為 0.85 至 0.95 或 1.90 至 2.00 或 2.95 至 3.05 或 3.90至 4.10。 a 根據申請專利範圍第1項之液晶顯示裝置，其中第一液 晶胞格或補償層具有95度至105度之間的扭轉角且d.A η/λ 〇 值為 0.90 至 1.00 或 2.10 至 2.20 或 3.15 至 3.25 或 4·15至 4.35。 9 . 根據申請專利範圍第1項之液晶顯示裝置，其中第一液 晶胞格或補償層具有度至115度之間的扭轉角且 d.An/λ 〇 值為 1.00 至 1.1〇 或 2.15 至 2.25 或 3.25 至 3.35或 4.25至 4.45。 7 4(210X297 公尨) {請先《讀背面之注意事項再填寫本頁)
TW081101755A 1991-09-17 1992-03-07 TW200604B (zh)

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US (1) US5287207A (zh)
EP (1) EP0535725B1 (zh)
JP (1) JPH05203916A (zh)
DE (1) DE69215635T2 (zh)
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