JPS5846327A - Liquid crystal display device - Google Patents

Liquid crystal display device

Info

Publication number
JPS5846327A
JPS5846327A JP56143874A JP14387481A JPS5846327A JP S5846327 A JPS5846327 A JP S5846327A JP 56143874 A JP56143874 A JP 56143874A JP 14387481 A JP14387481 A JP 14387481A JP S5846327 A JPS5846327 A JP S5846327A
Authority
JP
Japan
Prior art keywords
liquid crystal
display device
crystal display
contrast
polarization
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP56143874A
Other languages
Japanese (ja)
Inventor
Hisao Odaka
小高　久男
Masaharu Kamiyama
神山　當治
Akira Kobayashi
晃 小林
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP56143874A priority Critical patent/JPS5846327A/en
Publication of JPS5846327A publication Critical patent/JPS5846327A/en
Pending legal-status Critical Current

Links

Classifications

    • 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
    • G02F1/13725—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 guest-host interaction
    • 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
    • G02F1/133528—Polarisers

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Mathematical Physics (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

PURPOSE:To form a transmission type liquid crystal display device of a TN system having good contrast and visual angle characteristics without leakage of light when the device is turned off by using a specific anisotropic liquid crystal of high refractive index and polarizing plates of high degrees of polarization. CONSTITUTION:A transmission type liquid crystal display device of a twisted nemative system adequate for use as a display device for automobiles, etc. is formed by using (i) a liquid crystal compsn. which is added with a dye (e.g.; ''M176 Black Dye '' produced by Mitsui Toatsu Chemicals, Inc.) and has >=0.13 anisotropy of refractive index and (ii) polarizing plates having >=95% degree of polarization.

Description

【発明の詳細な説明】 本発明は、ＴＮ方力式透過形液晶表示装置に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a TN-type transmission type liquid crystal display device.

従来自動軍用液晶表示装置等においては、一般Ｋ　ＴＮ
方式透過形ネガティブ表示が行なわれている。In conventional automatic military liquid crystal display devices, general K TN
A transparent negative display is performed.

しかしながら、この表示方法による場合、オフ良めに表
示の見易い方向が限定されてしまう欠点もあった。However, this display method has the disadvantage that the directions in which the display can be easily seen are limited to a slightly off-screen direction.

本発明は、以上のような状況に鑑みてなされ九ものであ
シ、その目的は、オフ時の光もれがないと共に、コント
ラストが高く、かつ視角範囲の広い液晶表示装置を提供
することにある。The present invention has been made in view of the above circumstances, and its purpose is to provide a liquid crystal display device that does not leak light when turned off, has high contrast, and has a wide viewing angle range. be.

このような目的を達成するために、本発明による液晶表
示装置は、液晶材料に染料を添加すると共に、当該液晶
材料の屈折率異方法Δｎを０．１３以上とし、かつ偏光
板の偏光度を９６％以上としたものである。In order to achieve such an object, the liquid crystal display device according to the present invention adds a dye to the liquid crystal material, sets the refractive index difference Δn of the liquid crystal material to 0.13 or more, and sets the degree of polarization of the polarizing plate to 0.13 or more. 96% or more.

即ち％液晶材料に染料を添加することによシ、前述した
ようなオフ時の光もれを有効に改善できることが明らか
となった。また、この場合、同時に視角範囲を拡大する
効果をも有することが確認された。この様子を第１図お
よびｈ１２図に示す。That is, it has become clear that by adding a dye to the liquid crystal material, the above-mentioned light leakage during off-time can be effectively improved. Furthermore, in this case, it was confirmed that it also had the effect of expanding the viewing angle range at the same time. This situation is shown in Fig. 1 and Fig. h12.

ｊｌ！１図は、ネマティック液晶に３ｖｔ％の黒色染料
（三井東圧Ｍ１７６）を添加したゲストホスト、ネガテ
ィブ真水タイプ、視角方向７峙半の液晶表示装置、第２
図はツィステッドネマティック、ポジティブ表示タイプ
、視角方向７時牛の液晶表示装ｅ−３、ｆ→はそれぞれ
仰角ψが１０．３０．りυの硼合の４１性を示す。第１
ＩＩにおいては、コントラスト−視角曲線は円形状とな
シ、コントラストの視角依存性は極めて小さい。仰角ψ
が大きい場合でも、曲線はほぼ円形状を維持し、どの方
向から見てもほぼ一定のコントラストが囁得られる。こ
れを第２図と比較して見ると、染料を用いることによル
視角４Ｉ性が大幅に改善されたことが分る。即ち、第２
図においては、７時牛方向では大きなコントラストが祷
られるが、反対俸の１時牛方向のコントラストは非常に
小さく、見る方向によってコントラストの差が極端に大
きい。jl! Figure 1 shows a guest host in which 3vt% black dye (Mitsui Toatsu M176) is added to a nematic liquid crystal, a negative fresh water type, a liquid crystal display device with a viewing angle of seven and a half, and a second one.
The figure shows a twisted nematic, positive display type, liquid crystal display device e-3 and f→, each with an elevation angle ψ of 10.30. This shows the 41 properties of the relationship υ. 1st
In II, the contrast-viewing angle curve is circular, and the viewing angle dependence of contrast is extremely small. Elevation angle ψ
Even when the curve is large, the curve maintains a nearly circular shape, and a nearly constant contrast can be obtained from any direction. Comparing this with FIG. 2, it can be seen that the use of the dye significantly improved the visual angle property. That is, the second
In the figure, a large contrast is expected in the direction of the 7 o'clock cow, but the contrast in the direction of the 1 o'clock cow on the opposite side is very small, and the difference in contrast is extremely large depending on the viewing direction.

第１ＩＩおよび第２図から、染料を用いることにより、
コントラストの視角特性が改善される一方で、コントラ
ストの絶対値自体は低下してしｔ　５゜念念ｆ噛命→叶
この点は、以下に述べるように偏光額の１光度を選択す
ることによって改善できる。From FIG. 1II and FIG. 2, by using dyes,
While the visual angle characteristics of the contrast are improved, the absolute value of the contrast itself is reduced. It can be improved.

第３図に、偏光度とコントラストとの関係を示す。ここ
で偏光度Ｐは、 ｐ−、／μじ稈ｕｘｌｏｏ狗 ＨＯ＋Ｈ９０ （但し、ＨＯは上下偏光板の偏光軸を平行にした時の透
過光量、同じくＨ２Ｏは両偏光軸を直交させた時の透過
′ｙｔｉ１を示す）で示す。肉眼でコントラストの大小
が良く判別できる穴めにはコントラストが２５以上であ
ることが望ま（２い。従って、第３図から、ｆｉ光度９
６％以上の偏光板を使用することによシ、高コントラス
トの液晶表示装置を得ることができる。FIG. 3 shows the relationship between the degree of polarization and contrast. Here, the degree of polarization P is p-,/μji culm uxlooo dog HO+H90 (however, HO is the amount of transmitted light when the polarization axes of the upper and lower polarizers are parallel, and H2O is the amount of transmitted light when the polarization axes are perpendicular to each other) 'yti1). It is desirable for the contrast to be 25 or higher for holes where the magnitude of contrast can be easily distinguished with the naked eye.
By using a polarizing plate of 6% or more, a liquid crystal display device with high contrast can be obtained.

このように、ｇＡ元４ＩＯ偏光度を大きくシ念だけでも
コントラストを向上させることができるが、更に、液晶
の屈折率異方性ハを大きくすることにより、一層良好な
コントラストを得ることができる。As described above, the contrast can be improved simply by increasing the degree of polarization of the gA element 4IO, but even better contrast can be obtained by further increasing the refractive index anisotropy of the liquid crystal.

即ち、＄４図にコントラストのΔｎ依存性を示すが、同
図から明らかなようにハを０．１３以上にすることによ
り、２５以上の良好なコントラストが得られる。That is, FIG. 4 shows the dependence of contrast on Δn, and as is clear from the figure, by setting C to 0.13 or more, a good contrast of 25 or more can be obtained.

以上説明し穴ように、本発明によれば、液晶材料に染料
を添加すると共に、当該液晶材料の屈折率異方性を０．
１３以上とし、かつ偏光度９６−以上の偏光板を用いた
ことによシ、オフ時の光もれが改善できると共にコント
ラストが高くかつ視角範囲の広い液晶表示装置を笑現す
ることができ、自動車用表示等に適用して極めて有効な
効果を発揮する。As explained above, according to the present invention, a dye is added to a liquid crystal material and the refractive index anisotropy of the liquid crystal material is reduced to 0.
By using a polarizing plate with a polarization ratio of 13 or more and a polarization degree of 96 or more, it is possible to improve light leakage when off, and to realize a liquid crystal display device with high contrast and a wide viewing angle range. It exhibits extremely effective effects when applied to automobile displays, etc.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図および第２ＷＡＵコントラストの視角依存性を示
す特性図、第３図はコントラストの偏光度依存性を示す
特性図、第４図はコントラストのΔｎ依存性を示す特性
図である。 代理人　弁理士　　薄　　１）　利　　幸゛　５ゾＮ ５１４二１ 第２図 −１３７− 第３図 第４図 一一一一−ΔｎFIGS. 1 and 2 are characteristic diagrams showing the viewing angle dependence of WAU contrast, FIG. 3 is a characteristic diagram showing the polarization degree dependence of contrast, and FIG. 4 is a characteristic diagram showing the Δn dependence of contrast. Agent Patent Attorney Usui 1) Yuki Tori 5zoN 51421 Figure 2-137- Figure 3 Figure 4 1111-Δn

Claims (1)

【特許請求の範囲】[Claims] ＴＮ方式透過形の液晶表示装置において、液晶材料に染
料を添加すると共に、当！ＭＨ，晶材料の屈折率異方性
を０．１３以上とし、かつ偏光度が９６嘔以上のｓｙｔ
＊を用いたことを特徴とする液晶表示装置。In a TN transmissive type liquid crystal display device, dyes are added to the liquid crystal material and this! MH, a system in which the refractive index anisotropy of the crystal material is 0.13 or more and the degree of polarization is 96 or more
A liquid crystal display device characterized by using *.
JP56143874A 1981-09-14 1981-09-14 Liquid crystal display device Pending JPS5846327A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP56143874A JPS5846327A (en) 1981-09-14 1981-09-14 Liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP56143874A JPS5846327A (en) 1981-09-14 1981-09-14 Liquid crystal display device

Publications (1)

Publication Number Publication Date
JPS5846327A true JPS5846327A (en) 1983-03-17

Family

ID=15349006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP56143874A Pending JPS5846327A (en) 1981-09-14 1981-09-14 Liquid crystal display device

Country Status (1)

Country Link
JP (1) JPS5846327A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195224A (en) * 1983-03-29 1984-11-06 ゼロツクス・コ−ポレ−シヨン Multicolor liquid crystal display
JPS59195227A (en) * 1983-03-29 1984-11-06 ゼロツクス・コ−ポレ−シヨン High contrast liquid crystal display
EP0130492A2 (en) * 1983-07-01 1985-01-09 Koninklijke Philips Electronics N.V. Liquid crystal display
JPS61173817A (en) * 1985-01-30 1986-08-05 Amada Co Ltd Machining control method of wire cut electric discharge machine

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59195224A (en) * 1983-03-29 1984-11-06 ゼロツクス・コ−ポレ−シヨン Multicolor liquid crystal display
JPS59195227A (en) * 1983-03-29 1984-11-06 ゼロツクス・コ−ポレ−シヨン High contrast liquid crystal display
JPH0511293B2 (en) * 1983-03-29 1993-02-15 Xerox Corp
EP0130492A2 (en) * 1983-07-01 1985-01-09 Koninklijke Philips Electronics N.V. Liquid crystal display
JPS60104920A (en) * 1983-07-01 1985-06-10 エヌ・ヴェ−・フィリップス・グリュイランペン　ファブリ−ケン Liquid crystal display
JPS61173817A (en) * 1985-01-30 1986-08-05 Amada Co Ltd Machining control method of wire cut electric discharge machine

Similar Documents

Publication Publication Date Title
US5018839A (en) Liquid crystal display device
US4398805A (en) Transflective liquid crystal display
US20020063829A1 (en) Liquid crystal display device with compensation for viewing angle dependency and optical anisotropic element used therein
KR950025459A (en) LCD panel
EP0667553A3 (en) Normally white twisted nematic LCD with retardation films on opposite sides of liquid crystal material for improved viewing zone.
KR880005479A (en) Liquid crystal display device
JPH04212928A (en) Liquid crystal display device
JPH04140722A (en) Liquid crystal display device
US5208687A (en) Liquid crystal display device having a liquid crystal capsules dispersed in the first liquid crystal and including therein a second liquid crystal
JPH04138424A (en) Liquid crystal display device
JPS5846327A (en) Liquid crystal display device
JP3289386B2 (en) Color liquid crystal display
ATE109287T1 (en) LIQUID CRYSTAL DISPLAY FOR BLACK/WHITE PRESENTATION.
JP3289390B2 (en) Color liquid crystal display
JPH02125224A (en) Electrooptic element
JPS60189730A (en) Liquid crystal display device
JP3289392B2 (en) Color liquid crystal display
JPS604924A (en) Liquid crystal display device
JPS59139020A (en) Liquid crystal display device
JPS606927A (en) Transmission negative type liquid crystal cell
JPH07244280A (en) Twisted nematic type liquid crystal display element
JPH0756177A (en) Liquid crystal display element
JPS59116721A (en) Liquid-crystal display device
JPS58160928A (en) Liquid crystal display element
JPH02197816A (en) Liquid crystal display device