JPS638631A - Liquid crystal display device - Google Patents
Liquid crystal display deviceInfo
- Publication number
- JPS638631A JPS638631A JP61152190A JP15219086A JPS638631A JP S638631 A JPS638631 A JP S638631A JP 61152190 A JP61152190 A JP 61152190A JP 15219086 A JP15219086 A JP 15219086A JP S638631 A JPS638631 A JP S638631A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- substrates
- theta
- chiral agent
- display device
- 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
Links
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 57
- 239000000758 substrate Substances 0.000 claims abstract description 23
- UWCWUCKPEYNDNV-LBPRGKRZSA-N 2,6-dimethyl-n-[[(2s)-pyrrolidin-2-yl]methyl]aniline Chemical compound CC1=CC=CC(C)=C1NC[C@H]1NCCC1 UWCWUCKPEYNDNV-LBPRGKRZSA-N 0.000 claims abstract description 19
- 239000000203 mixture Substances 0.000 claims description 5
- 238000000034 method Methods 0.000 abstract description 9
- 239000011159 matrix material Substances 0.000 abstract description 4
- 238000001771 vacuum deposition Methods 0.000 abstract description 3
- 238000002834 transmittance Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 210000002858 crystal cell Anatomy 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- 239000000565 sealant Substances 0.000 description 2
- 239000004642 Polyimide Substances 0.000 description 1
- CZPWVGJYEJSRLH-UHFFFAOYSA-N Pyrimidine Chemical compound C1=CN=CN=C1 CZPWVGJYEJSRLH-UHFFFAOYSA-N 0.000 description 1
- 210000003323 beak Anatomy 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- IGARGHRYKHJQSM-UHFFFAOYSA-N cyclohexylbenzene Chemical compound C1CCCCC1C1=CC=CC=C1 IGARGHRYKHJQSM-UHFFFAOYSA-N 0.000 description 1
- WVIIMZNLDWSIRH-UHFFFAOYSA-N cyclohexylcyclohexane Chemical compound C1CCCCC1C1CCCCC1 WVIIMZNLDWSIRH-UHFFFAOYSA-N 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 229910052738 indium Inorganic materials 0.000 description 1
- APFVFJFRJDLVQX-UHFFFAOYSA-N indium atom Chemical compound [In] APFVFJFRJDLVQX-UHFFFAOYSA-N 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 229920001721 polyimide Polymers 0.000 description 1
- 238000007740 vapor deposition Methods 0.000 description 1
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
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
Landscapes
- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Liquid Crystal (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Polarising Elements (AREA)
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、高時弁ｖ１駆動による表示をするのに最適な
液晶表示装置に関する。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a liquid crystal display device that is most suitable for displaying by driving a high-temperature valve v1.
（従来の技術）
一般に液晶表示装置において、２枚の電極基板間で液晶
分子を捩れ配向させるには、ラビング法や斜め蒸着法等
により各電極基板対向面に配向処理を施し、これら電極
基板の配向方向を液晶の捩れ配向の角度で設定対向させ
る。そして電極基板間の外周を封止剤により封着すると
ともに電極基板間に液晶を封入することにより行われる
。なお、上記電極基板間には液晶を封入するとともにカ
イラル剤が添加され、適当なツイスト能が付与されてい
る。(Prior Art) In general, in a liquid crystal display device, in order to twist and align liquid crystal molecules between two electrode substrates, alignment treatment is performed on the facing surfaces of each electrode substrate by rubbing method, oblique vapor deposition method, etc. The orientation direction is set at the angle of the twisted orientation of the liquid crystal and the liquid crystals are made to face each other. Then, the outer periphery between the electrode substrates is sealed with a sealant, and liquid crystal is sealed between the electrode substrates. Note that a liquid crystal is sealed between the electrode substrates and a chiral agent is added thereto to impart appropriate twisting ability.
従来からこのような液晶表示装置の中で視野角あるいは
コン１へラストを向上させたものがいくつか開示されて
いる。Several such liquid crystal display devices have been disclosed in the past that have improved viewing angle or contrast.
例えば特開昭６０−１０７０２０＠においては、液晶分
子の捩れ配向の設定角度Ｏが１８０°〜３６０°、カイ
ラル剤が添加され、液晶層厚ｄとピッチｐとの比が、
ｄ／ｐ＝θ／ ３６０’
とされている。For example, in JP-A-60-107020@, the set angle O of the twisted orientation of liquid crystal molecules is 180° to 360°, a chiral agent is added, and the ratio of the liquid crystal layer thickness d to the pitch p is d/p=θ / 360'.
また特開昭６０−５０５１１号においては、液晶分子の
捩れ配向の設定角度θが１６０°〜２００°、一定量の
カイラル剤が添加されている。Further, in JP-A No. 60-50511, the set angle θ of the twisted orientation of liquid crystal molecules is 160° to 200°, and a certain amount of chiral agent is added.
ざらに特開昭６０−７３５２５号においては、液晶分子
の捩れ配向の８２定角度がほぼ２７０’ 、液晶層厚ｄ
とピッチｐとの関係は、
ｄくｐく２ｄ
とされ、上下の偏光板の透過軸または吸収軸同志とが互
いになす角度が９０°±２０°とされている。In JP-A No. 60-73525, the 82 constant angle of the twisted orientation of liquid crystal molecules is approximately 270', and the liquid crystal layer thickness d
The relationship between and the pitch p is d×p×2d, and the angle between the transmission axes or absorption axes of the upper and lower polarizing plates is 90°±20°.
（発明が解決しようとする問題点）
ところで液晶分子を１８０°以上の設定角度で捩れ配向
させた液晶表示装置においては、上記したカイラル剤の
添加によるツイスト能に起因して顕著なヒスプリシス現
象やリバース発生等が生じることがある。しかしながら
上記したいずれの液晶表示装置においても、上記ツイス
ト能についての設定が明確でない。またツイスト能の値
が適当でないと、配向膜れや電気光学特性の低下が生じ
、また高時分割駆動によるドツトマトリクス表示ができ
ないことがある。(Problems to be Solved by the Invention) By the way, in a liquid crystal display device in which liquid crystal molecules are twisted and oriented at a set angle of 180° or more, remarkable hysteresis phenomenon and reverse Occasionally, outbreaks may occur. However, in any of the liquid crystal display devices described above, the setting of the twist ability is not clear. Furthermore, if the value of the twist ability is not appropriate, alignment film cracking or deterioration of electro-optical properties may occur, and dot matrix display by high time division driving may not be possible.
本発明は上記した事情に鑑みて創案されたもので、高時
分割駆動によるドツトマトリクス表示が可能で、かつ配
向膜れがなく高コントラストの表示を得ることのできる
液晶表示装置を提供することを目的としている。The present invention has been devised in view of the above-mentioned circumstances, and an object of the present invention is to provide a liquid crystal display device that is capable of dot matrix display by high time division driving and that can obtain a high contrast display without alignment film blur. The purpose is
［発明の構成］
（問題点を解決するための手段）
すなわち本発明の液晶表示装置は、対向配置された一対
の基板と、これらの基板の対向面に形成され、液晶分子
を前記一対の基板間で１８０°以上の所定の角度θで捩
れ配向させる分子配向膜と、前記基板間に挟持され、ツ
イスト能がθ−１０’乃至θ−６０’の範囲となるカイ
ラル剤が添加された液晶組成物とを具備している。[Structure of the Invention] (Means for Solving the Problems) That is, the liquid crystal display device of the present invention includes a pair of substrates disposed opposite to each other, and a liquid crystal display device formed on the opposing surfaces of these substrates, and in which liquid crystal molecules are connected to the pair of substrates. A liquid crystal composition sandwiched between a molecular alignment film that twists and aligns at a predetermined angle θ of 180° or more between the substrates and a chiral agent having a twist ability in the range of θ-10' to θ-60'. Equipped with things.
（作用）
本発明の液晶表示装置において、液晶分子を１８０°以
上の設定した角度θで捩れ配向させる液晶セルに、ツイ
スト能がθ−１０’〜θ−６０’に相当する量のカイラ
ル剤が添加されているので、高時分割駆動によるドツト
マトリクス表示が可能となり、配向膜れがなく高コント
ラストを得ることができるようになる。(Function) In the liquid crystal display device of the present invention, a chiral agent in an amount corresponding to a twist ability of θ-10' to θ-60' is added to the liquid crystal cell that twists and aligns liquid crystal molecules at a set angle θ of 180° or more. Since it is added, it becomes possible to perform dot matrix display by high time division driving, and it becomes possible to obtain high contrast without alignment film blur.
（実施例）
以下、本発明の実施例の詳細を図面に基づいて説明する
。(Example) Hereinafter, details of an example of the present invention will be described based on the drawings.
第２図はこの実施例の複屈折効果を利用した液晶表示装
置を示す図である。同図に示すこの装置は、液晶セル１
の両側に偏光板２．２を配置してなる。液晶セル１は、
表面に透明閑化インジウム導電ｌｌ５ｌ（以下単に「電
極」と呼ぶ。）３が形成された２枚の厚さ１．１ｍｍの
ガラス基板４をそれぞれ電極３面を内側にしてス・１向
配置さけ、これらのガラス基板４間の外周を封止剤６に
て到着ざＵて液晶５を封入させる。またそれぞれのガラ
ス基板４上の電極３面を覆うようにポリイミドからなる
分子配向膜７が形成され、これらの表面にラビング法に
よる配向処理が施され、ざらに第３図に示すように、こ
れらの配向処理方向が１８０°以上の角度θに交差対向
され、液晶５の捩れ配向の設定角度がθとされている。FIG. 2 is a diagram showing a liquid crystal display device utilizing the birefringence effect of this embodiment. This device shown in the figure consists of a liquid crystal cell 1
Polarizing plates 2.2 are arranged on both sides of the polarizing plate 2.2. The liquid crystal cell 1 is
Two 1.1 mm thick glass substrates 4 on which transparent conductive indium conductors (hereinafter simply referred to as "electrodes") 3 are formed are arranged facing toward each other with the electrodes 3 facing inside. Then, a sealant 6 is applied to the outer periphery between these glass substrates 4, and the liquid crystal 5 is sealed therein. In addition, a molecular alignment film 7 made of polyimide is formed to cover the surface of the electrodes 3 on each glass substrate 4, and these surfaces are subjected to an alignment treatment by a rubbing method, as roughly shown in FIG. The orientation treatment directions of the liquid crystals 5 are arranged to cross each other at an angle θ of 180° or more, and the setting angle of the twisted orientation of the liquid crystal 5 is θ.
またこの液晶ヒル１の両側に配置された隔光板２の透過
軸および吸収軸の方向が各ガラス基板４に近接する液晶
分子のダイレクタ百、百′と異なるものとされ、ざらに
偏光板２の透過軸ＰとＰ′とがなす角度Ａが２０’〜８
０’の範囲内とされている。Furthermore, the directions of the transmission and absorption axes of the partition plates 2 disposed on both sides of the liquid crystal hill 1 are different from those of the directors of liquid crystal molecules adjacent to each glass substrate 4. The angle A between the transmission axes P and P' is 20' to 8
It is considered to be within the range of 0'.
上記液晶５の組成物としては、フェニルシクロへキリン
系液晶であり、ざらに後述する呈の左回りのカイラル剤
（Ｓ−８１１： Ｅ−メルク社製）が添加されている。The composition of the liquid crystal 5 is a phenylcyclohekirin liquid crystal, to which a counterclockwise chiral agent (S-811, manufactured by E-Merck), which will be briefly described later, is added.
また本実施例において、時分割駆動特性を示す値につい
ては、以下に示すように定義した。Further, in this embodiment, values indicating time-division drive characteristics are defined as shown below.
すなわち第４図に示す型液晶表示装置の鋳型的な電圧−
透過率特性において、透過率が９０％となる電圧をＶ２
Ｏ，透過率が５０％となる電圧をＶ２Ｏとしたとき、時
分割駆動特性を示すｌＩｌ：ｔｒをγ＝ （Ｖ５Ｏ−Ｖ
９Ｏ）
／Ｖ９ｏ×１００（％）
としている。この場合、γの値が小ざいものほど高時分
割駆動が可能となる。例えばデユーティ比が１／２００
ではγが７．３％以下であることが必要とされる。That is, the mold voltage of the type liquid crystal display device shown in FIG.
In the transmittance characteristics, the voltage at which the transmittance becomes 90% is V2.
When the voltage at which the transmittance becomes 50% is V2O, lIl:tr, which indicates the time-division drive characteristic, is expressed as γ= (V5O-V
9O) /V9o×100(%). In this case, the smaller the value of γ, the more time divisional driving becomes possible. For example, the duty ratio is 1/200
Therefore, γ is required to be 7.3% or less.
そして液晶５の捩れ配向の設定角度θが１８０゜および
２２０°のそれぞれについてカイラル剤の添加徂を変化
すなわらツイスト能を変化させ、これらの電圧−透過率
特性を測定し、上記した時分割駆動特性を示す値γを求
めた。Then, when the setting angle θ of the twisted orientation of the liquid crystal 5 is 180° and 220°, the addition range of the chiral agent is changed and the twisting ability is changed, and these voltage-transmittance characteristics are measured, and the above-mentioned time division A value γ indicating the driving characteristics was determined.
第１図（ａ）、（ｂ）に上記した条件により測定された
電圧−透過率特性から求められた時分割駆動特性を示す
値γを示す。FIGS. 1(a) and 1(b) show the value γ indicating the time-division drive characteristic determined from the voltage-transmittance characteristic measured under the above-mentioned conditions.
同図に示すように、ツイスト能がθ−１０°以上の範囲
■および■、θ−６０’より小さい範囲■に相当する量
のカイラル剤を添加した場合においては、γの値が７．
３％より大きくなり、デユーティ比が１／２００での時
分割駆動は困難となる。またツイスト能がθ＋１０°以
上の範囲■に相当する量のカイラル剤を添加した場合に
おいては、顕著なヒステリシス現象やリバース発生等に
起因して配向膜れが生じ、時分割駆動は不可能となる。As shown in the figure, when a chiral agent is added in an amount corresponding to ranges (1) and (2) where the twist ability is θ-10° or more, and a range (2) where the twist ability is less than θ-60', the value of γ is 7.
If it becomes larger than 3%, time-division driving at a duty ratio of 1/200 becomes difficult. In addition, when a chiral agent is added in an amount corresponding to the range ■ where the twist ability is θ + 10° or more, alignment film failure occurs due to significant hysteresis phenomenon and reverse occurrence, making time-division driving impossible. .
一方、ツイスト能がθ−１０°〜θ−６０°の範囲■に
相当するＨのカイラル剤を添加した場合においては、γ
の値が７．３％以下となり、デユーティ比が１７２００
での時分割駆動が可能となる。On the other hand, when a chiral agent of H whose twist ability corresponds to the range θ-10° to θ-60° is added, γ
The value of is 7.3% or less, and the duty ratio is 17200.
This enables time-division driving.
次に上述の液晶表示装置における分子配向膜７の配向処
理を上記したラビング法の代わりにＳｉＯ斜め真空蒸着
法によるものを施し、液晶分子の捩れ配向の設定角度θ
が２７０°のものについて上述と同様にカイラル剤の添
加量を変化させつまりツイスト能を変化させ、この電圧
−透過率特性を測定し同様に時分割駆動特性を示す値γ
を求めた。Next, the alignment treatment of the molecular alignment film 7 in the above-mentioned liquid crystal display device is performed by SiO oblique vacuum deposition method instead of the above-mentioned rubbing method, and the set angle θ of the twisted orientation of the liquid crystal molecules is applied.
When the angle is 270°, the amount of chiral agent added is changed in the same way as described above, that is, the twisting ability is changed, and the voltage-transmittance characteristics are measured.
I asked for
第１図（Ｃ）に上記した条件により測定された電圧−透
過率特性から求められた時分割駆動特性を示す値γを示
す。FIG. 1(C) shows the value γ indicating the time-division drive characteristic determined from the voltage-transmittance characteristic measured under the above-mentioned conditions.
この場合においても、第１図（ａ）、（ｂ）に示したも
のと同様の結果が得られる。すなわらツイスト能がθ−
１０°〜θ−６０’の範囲■に相当する量のカイラル剤
を添加すればデユーティ比が１７２００での時分割駆動
が可能となる。In this case as well, results similar to those shown in FIGS. 1(a) and 1(b) can be obtained. In other words, the twist ability is θ−
By adding a chiral agent in an amount corresponding to the range (1) of 10° to θ-60', time-division driving with a duty ratio of 17200 becomes possible.
以上のような結果に基づいて、液晶分子の捩れ配向の設
定角度θが１８０°（ラビング法）、２２０° （ラビ
ング法）、２７０’ （ＳｉＯ斜め真空蒸着法）で、
ツイスト能がθ−１０°〜θ−６０°の範囲内に相当す
る量のカイラル剤を添加してなる液晶表示装置を、１／
２００のデユーティ比で時分割駆動させた結果、配向膜
れがなく高コントラストの所望の表示が得られた。Based on the above results, when the set angle θ of the twisted orientation of liquid crystal molecules is 180° (rubbing method), 220° (rubbing method), and 270' (SiO oblique vacuum evaporation method),
A liquid crystal display device in which a chiral agent is added in an amount corresponding to a twist ability in the range of θ-10° to θ-60° is
As a result of time-division driving at a duty ratio of 200, a desired display with high contrast and no alignment film was obtained.
なお、上述した実施例においては、液晶５の組成物とし
てフェニルシクロヘキサン系のものが用いられていたが
、本発明はこれに限定されることなく、ビフェニル系、
ビシクロヘキサン系、ピリミジン系、エステル系等の液
晶においても同様な効果を得ることができる。In addition, in the above-mentioned embodiment, a phenylcyclohexane-based composition was used as the composition of the liquid crystal 5, but the present invention is not limited to this, and biphenyl-based,
Similar effects can be obtained with bicyclohexane-based, pyrimidine-based, ester-based, etc. liquid crystals.
また添ｈ口されたカイラル剤としてＳ−８１１（Ｅ−メ
ルク社製）であったが、これに限定されず、他のカイラ
ル剤であっても上述したようにツイスト能がθ−１０°
〜θ−６０”の範囲内に相当する量のカイラル剤を添加
すれば同様の効果を得ることができる。In addition, although S-811 (manufactured by E-Merck Co., Ltd.) was used as the chiral agent that was added, it is not limited to this, and even other chiral agents may have a twisting ability of θ-10° as described above.
A similar effect can be obtained by adding a chiral agent in an amount corresponding to the range of .theta.-60''.
［発明の効果］
以上説明したように本発明の液晶表示装置によれば、高
時分割駆動による表示が可能となり、かつ配向膜れがな
く高コントラストの表示を得ることができる。[Effects of the Invention] As described above, according to the liquid crystal display device of the present invention, it is possible to perform display by high time division driving, and to obtain a high contrast display without alignment film blur.
第１図は本発明の一実施例の液晶表示装置の時分割駆動
特性を示す値を示す図、第２図はこの実施例の型液晶表
示装置を示す縦断正面図、第３図はこの実施例の液晶表
示装置を示す概略的平面図、第４図は型液晶表示装置の
典型的な電圧−透過率特性を示す図である。
γ・・・・・・・・・時分割駆動特性を示す１直出願人
株式会社 東 芝
代理人 弁理士 須 山 （左 −
ツメスト嘴し
第１図
第 ２０
第３図
印ηυ先／ｉＶ
第４図FIG. 1 is a diagram showing values indicating time division drive characteristics of a liquid crystal display device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view showing a liquid crystal display device according to this embodiment, and FIG. FIG. 4 is a schematic plan view showing an example liquid crystal display device, and is a diagram showing typical voltage-transmittance characteristics of a type liquid crystal display device. γ・・・・・・・1 direct applicant showing time-division drive characteristics Toshiba Corporation Patent attorney Suyama (Left - Tsumesto beak Figure 1 Figure 20 Figure 3 Mark ηυ tip/iV Figure 4
Claims (1)
の基板間で１８０°以上の所定の角度θで捩れ配向させ
る分子配向膜と、 前記基板間に挟持され、ツイスト能がθ−１０°乃至θ
−６０°の範囲となるカイラル剤が添加された液晶組成
物と を備えた液晶表示装置。(1) a pair of substrates arranged opposite to each other; a molecular alignment film formed on the opposing surfaces of these substrates to twist and align liquid crystal molecules at a predetermined angle θ of 180° or more between the pair of substrates; and the substrates. The twisting ability is between θ-10° and θ.
A liquid crystal display device comprising: a liquid crystal composition to which a chiral agent is added that has an angle of -60°.
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152190A JPS638631A (en) | 1986-06-28 | 1986-06-28 | Liquid crystal display device |
| US07/064,001 US4779958A (en) | 1986-06-28 | 1987-06-19 | Liquid crystal device having different natural and induced twists |
| EP87305597A EP0251665B1 (en) | 1986-06-28 | 1987-06-23 | Liquid crystal device |
| DE87305597T DE3787055T2 (en) | 1986-06-28 | 1987-06-23 | Liquid crystal device. |
| KR1019870006576A KR900006939B1 (en) | 1986-06-28 | 1987-06-27 | Liquid crystal display |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61152190A JPS638631A (en) | 1986-06-28 | 1986-06-28 | Liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS638631A true JPS638631A (en) | 1988-01-14 |
Family
ID=15535028
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61152190A Pending JPS638631A (en) | 1986-06-28 | 1986-06-28 | Liquid crystal display device |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS638631A (en) |
| KR (1) | KR900006939B1 (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6280622A (en) * | 1985-10-04 | 1987-04-14 | Konishiroku Photo Ind Co Ltd | Liquid crystal display device |
| JPS62194224A (en) * | 1986-02-20 | 1987-08-26 | Sharp Corp | Twisted nematic type liquid crystal display element |
-
1986
- 1986-06-28 JP JP61152190A patent/JPS638631A/en active Pending
-
1987
- 1987-06-27 KR KR1019870006576A patent/KR900006939B1/en not_active IP Right Cessation
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6280622A (en) * | 1985-10-04 | 1987-04-14 | Konishiroku Photo Ind Co Ltd | Liquid crystal display device |
| JPS62194224A (en) * | 1986-02-20 | 1987-08-26 | Sharp Corp | Twisted nematic type liquid crystal display element |
Also Published As
| Publication number | Publication date |
|---|---|
| KR890000919A (en) | 1989-03-17 |
| KR900006939B1 (en) | 1990-09-25 |
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