JPH0261616A - Liquid crystal display element - Google Patents
Liquid crystal display elementInfo
- Publication number
- JPH0261616A JPH0261616A JP21307088A JP21307088A JPH0261616A JP H0261616 A JPH0261616 A JP H0261616A JP 21307088 A JP21307088 A JP 21307088A JP 21307088 A JP21307088 A JP 21307088A JP H0261616 A JPH0261616 A JP H0261616A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- alignment
- uniform
- polystyrene
- orientation
- 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 48
- 239000004793 Polystyrene Substances 0.000 claims abstract description 20
- 229920002223 polystyrene Polymers 0.000 claims abstract description 20
- 239000005262 ferroelectric liquid crystals (FLCs) Substances 0.000 claims abstract description 15
- 230000003446 memory effect Effects 0.000 abstract description 9
- 230000003993 interaction Effects 0.000 abstract description 8
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 4
- 125000003277 amino group Chemical group 0.000 abstract description 3
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 abstract description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 abstract description 3
- 239000004698 Polyethylene Substances 0.000 abstract description 2
- -1 polyethylene Polymers 0.000 abstract description 2
- 229920000573 polyethylene Polymers 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 21
- 230000005684 electric field Effects 0.000 description 9
- 239000004990 Smectic liquid crystal Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 229920000620 organic polymer Polymers 0.000 description 6
- 229920006254 polymer film Polymers 0.000 description 6
- 239000004988 Nematic liquid crystal Substances 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000007740 vapor deposition Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 239000004642 Polyimide Substances 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 229920001721 polyimide Polymers 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 239000004372 Polyvinyl alcohol Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 239000004986 Cholesteric liquid crystals (ChLC) Substances 0.000 description 1
- IMROMDMJAWUWLK-UHFFFAOYSA-N Ethenol Chemical compound OC=C IMROMDMJAWUWLK-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920010524 Syndiotactic polystyrene Polymers 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000004745 nonwoven fabric Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、強誘電性スメクチック液晶の電気光学効果を
利用する液晶表示素子に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a liquid crystal display device that utilizes the electro-optic effect of ferroelectric smectic liquid crystal.
従来の技術
強誘電性液晶は、光学活性な系からなる傾いたスメクチ
ック液晶相であり、カイラルスメクチックＣ液晶相（以
下、カイラルＳ ｍ Ｃと略記する）をはじめ、カイラ
ルスメクチックＩ等さらに低温側の強誘電性スメクチッ
ク液晶相が知られている。これらの強誘電性スメクチッ
ク液晶は、従来から液晶表示素子に用いられているネマ
チック液晶と比較して非常に高速な電界応答性や、電界
が加わっていない状態でも表示状態を保持するメモリ効
果など、優れた特性を有するといわれている。この強誘
電性液晶を用いて表示素子を作製すれば、単純マトリク
ス駆動方式で、ネマチック液晶を用いたＴＮ方式やＳＴ
Ｎ方式に比べて走査線の数を多くすることができ、大型
画面の表示素子も実現可能であると考えられている。そ
して、近年その実現に向けて強誘電性液晶材料の開発や
駆動方法の開発が、さかんに行われている。Conventional ferroelectric liquid crystal is a tilted smectic liquid crystal phase consisting of an optically active system, including chiral smectic C liquid crystal phase (hereinafter abbreviated as chiral S m C), chiral smectic I, etc. Ferroelectric smectic liquid crystal phases are known. These ferroelectric smectic liquid crystals have extremely fast electric field response compared to nematic liquid crystals conventionally used in liquid crystal display elements, and have a memory effect that maintains the display state even when no electric field is applied. It is said to have excellent properties. If a display element is manufactured using this ferroelectric liquid crystal, it can be used in a simple matrix drive system, a TN system using a nematic liquid crystal, or an ST system using a nematic liquid crystal.
It is possible to increase the number of scanning lines compared to the N method, and it is believed that a display element with a large screen can be realized. In recent years, efforts have been made to develop ferroelectric liquid crystal materials and drive methods to achieve this goal.
液晶材料や駆動方法と並んで表示素子を作製する上で最
も重要な技術のひとつに、液晶の均一配向技術が挙げら
れる。強誘電性液晶はネマチック液晶と異なり層構造を
もっているため、ネマチック液晶に比べて均一配向を得
ることが困難である。そのため、種々の配向方法が提案
されている。とくに、現在実用化が活発に検討されてい
る強誘電性カイラルＳ ｍ Ｃ液晶をギヤツブ数μｍ以
下の非常に薄いセル内に封入したもので、複屈折の変化
を利用する５ＳＦＬＣ型の素子について、提案されてい
る配向方法の例を挙げれば、シェアリング法、温度勾配
法（エピタキシャル成長法）ＳｉＯ等の斜方蒸着法、−
軸延伸有機高分子フィルムによる方法、有機高分子膜ラ
ビング法等が挙げられる。Along with liquid crystal materials and driving methods, one of the most important technologies for manufacturing display elements is the uniform alignment technology of liquid crystals. Since ferroelectric liquid crystals have a layered structure unlike nematic liquid crystals, it is difficult to obtain uniform alignment compared to nematic liquid crystals. Therefore, various orientation methods have been proposed. In particular, we are currently actively considering the practical application of 5SFLC type elements, which are encapsulated ferroelectric chiral S m C liquid crystals in extremely thin cells with a diameter of several μm or less, and utilize changes in birefringence. Examples of orientation methods that have been proposed include shearing method, temperature gradient method (epitaxial growth method), oblique evaporation method of SiO, etc.
Examples include a method using an axially stretched organic polymer film, and an organic polymer film rubbing method.
上記の配向方法のうち、シェアリング法と温度勾配法に
ついては、実験室レベルで数ｍｍ角程度以下の面積の均
一配向を得るためには有効であるが、これらの方法では
、一般に表示素子に必要な、さらに大面積の均一配向を
得ることは非常に難しいと考えられている。Among the above alignment methods, the shearing method and the temperature gradient method are effective for obtaining uniform alignment in an area of several mm square or less at the laboratory level, but these methods generally Achieving the necessary uniform orientation over large areas is believed to be very difficult.
斜方蒸着法は、蒸着によって得られる表面形状の異方性
によって液晶を配向させる方法である。The oblique vapor deposition method is a method of orienting liquid crystal using the anisotropy of the surface shape obtained by vapor deposition.
蒸着角を８０”以上に太き（することで均一配向が得ら
れることが報告されているが、このような素子では、液
晶分子が大きなプレチルト角を有するため、電界と自発
分極の方向のずれが大きく、電界応答速度が遅くなると
いう問題点をもっている。また、配向処理の工程に長時
間を要し、蒸着装置を必要とするため製造コストも高（
なり、大面積の配向処理も困難である。It has been reported that uniform alignment can be obtained by increasing the deposition angle to 80" or more, but in such devices, because the liquid crystal molecules have a large pretilt angle, the direction of the electric field and spontaneous polarization may be misaligned. There is a problem that the electric field response speed is slow due to the large amount of film.Also, the alignment process takes a long time and requires a vapor deposition device, so the manufacturing cost is high (
Therefore, it is difficult to perform orientation treatment on a large area.
一軸延伸有機高分子フィルムによる方法は、延伸処理に
よって高分子鎖が延伸方向に一軸配向し、それにしたが
って液晶が配向するものである。有機高分子膜ラビング
法による配向機構も同様に有機高分子膜表面を繊維で擦
ることによって、せん断応力が加わり表面付近の高分子
鎖が一軸配向し、それにしたがって液晶が配向するもの
であり、一般に有機高分子膜としてポリイミドが用いら
れている。これらは２つは、まとめて−軸配向性高分子
膜による液晶配向処理と言うことができる。In the method using a uniaxially stretched organic polymer film, the polymer chains are uniaxially aligned in the stretching direction by stretching treatment, and the liquid crystal is oriented accordingly. Similarly, the alignment mechanism by the organic polymer film rubbing method is that by rubbing the surface of an organic polymer film with a fiber, shear stress is applied, causing the polymer chains near the surface to become uniaxially aligned, and the liquid crystal is aligned accordingly. Polyimide is used as an organic polymer film. These two processes can be collectively referred to as liquid crystal alignment processing using a -axis alignment polymer film.
一軸配向性高分子膜を用いて液晶を配向させる方法は、
容易に配向処理を行うことができ、斜方蒸着法のように
高価な蒸着装置を必要としない。The method for aligning liquid crystal using a uniaxially aligned polymer film is as follows:
Orientation treatment can be easily performed, and expensive vapor deposition equipment is not required as in oblique vapor deposition.
また、大面積の配向処理も容易である。Further, alignment treatment for a large area is also easy.
−軸配向性高分子膜を用いて配向処理を行えば、最も容
易に、しかも安価に強誘電性液晶表示素子を製造するこ
とができる。A ferroelectric liquid crystal display element can be manufactured most easily and at low cost by performing alignment treatment using a -axis-oriented polymer film.
発明が解決しようとする課題
しかし、−軸配向性高分子膜を用いて液晶表示素子を作
製した場合にも次のような問題点がある。それは、一般
に完全な双安定メモリ効果が得られないことである。即
ち、電圧ＯＦＦにすると電圧０８時に比べて液晶パネル
の光透過率の増加または減少がおこる。このことは強誘
電性液晶分子の配列が電圧無印加時には電圧印加時とは
異なる状態に変化してしまうことに起因しており、した
がって双安定なメモリ状態を保持できないのである。メ
モリ効果がないと表示素子の実駆動時において、高いコ
ントラストが得られず大きな問題である。Problems to be Solved by the Invention However, even when a liquid crystal display element is manufactured using a -axis oriented polymer film, there are the following problems. The problem is that a complete bistable memory effect is generally not achieved. That is, when the voltage is turned OFF, the light transmittance of the liquid crystal panel increases or decreases compared to when the voltage is 08. This is due to the fact that the arrangement of ferroelectric liquid crystal molecules changes to a different state when no voltage is applied than when a voltage is applied, and therefore a bistable memory state cannot be maintained. Without the memory effect, high contrast cannot be obtained when the display element is actually driven, which is a big problem.
本発明は、双安定性が高（、かつ均一配向性も大きな強
誘電性液晶表示素子を提供することを目的とする。An object of the present invention is to provide a ferroelectric liquid crystal display element with high bistability (and uniform alignment).
課題を解決するための手段
液晶配向膜として結晶性ポリスチレンを用いて強誘電性
液晶表示素子を構成する。Means for Solving the Problems A ferroelectric liquid crystal display element is constructed using crystalline polystyrene as a liquid crystal alignment film.
作用
一軸配向性高分子膜を液晶配向膜として用いて液晶表示
素子を作製した場合に、配向の欠陥が発生したり、充分
なメモリ効果が得られない最大の原因は、強誘電性スメ
クチック液晶相において配向膜による液晶の配向方位規
制力が強過ぎるためであると考えられる。When a liquid crystal display element is fabricated using a uniaxially oriented polymer film as a liquid crystal alignment film, the main reason why alignment defects occur or a sufficient memory effect cannot be obtained is due to the ferroelectric smectic liquid crystal phase. This is thought to be because the alignment film has too strong a force for controlling the alignment direction of the liquid crystal.
強誘電性液晶相、例えばカイラルＳ ｍ Ｃ相において
、液晶分子はカイラルＳｍＣ相の本来のチルト角θに対
応する角度だけ、層法線から傾こうとする。即ち、−軸
配向によって規定されていた方位からθだけずれて傾こ
うとする。In a ferroelectric liquid crystal phase, for example a chiral S m C phase, the liquid crystal molecules tend to tilt from the layer normal by an angle corresponding to the original tilt angle θ of the chiral S m C phase. That is, it attempts to tilt by θ away from the orientation defined by the -axis orientation.
ところが、−軸配向処理による強い配向方位規制力が存
在すれば、配向膜界面近くの分子は束縛をうけて本来の
チルト角θだけ傾（ことができず電界無印加時のチルト
角θ′がθより小さ（なる。電界を加えると電界の強さ
に応じてチルト角は大きくなり、ある電界以上ではθに
等しくなる。ところが電界を取り去ると液晶分子が配向
膜の−軸配向性に束縛された方向θ″に戻ってしまうた
め、双安定なメモリ効果が得られない。However, if there is a strong orientation regulating force due to -axis alignment treatment, the molecules near the interface of the alignment film will be constrained and unable to tilt by the original tilt angle θ, and the tilt angle θ′ when no electric field is applied will change. When an electric field is applied, the tilt angle increases depending on the strength of the electric field, and becomes equal to θ above a certain electric field. However, when the electric field is removed, the liquid crystal molecules are constrained by the -axis orientation of the alignment film. Since it returns to the original direction θ'', a bistable memory effect cannot be obtained.
−軸配向性高分子によって液晶が配向する場合、高分子
の構成単位のうちカルボニル基、アミノ基、ヒドロキシ
ル基等の極性基の寄与が大きいと考えられる。このよう
な極性基をもつ高分子は、液晶との相互作用が大きく、
配向方位規制力が強すぎるため、これらの高分子を配向
膜として用いた素子ではメモリ効果が充分でない。一方
、ポリエチレンのようにまった（極性基をもたない高分
子を配向膜として用いると、液晶との相互作用か弱すぎ
て均一配向が得られない。- When a liquid crystal is oriented by an axially oriented polymer, polar groups such as carbonyl groups, amino groups, and hydroxyl groups among the structural units of the polymer are considered to make a large contribution. Polymers with such polar groups have a strong interaction with liquid crystals,
Since the orientation regulating force is too strong, the memory effect is not sufficient in devices using these polymers as alignment films. On the other hand, if a polymer such as polyethylene (which does not have polar groups) is used as an alignment film, the interaction with the liquid crystal is too weak and uniform alignment cannot be obtained.
本発明の液晶表示素子においては、配向膜として一軸配
向処理した結晶性ポリスチレン膜を用いる。液晶の配向
にはポリスチレンの側鎖ベンゼン環が寄与しており、液
晶は他の一軸配向高分子膜を用いた場合と異なり、主鎖
の一軸配向方向と直交方向に配向する。ベンゼン環と液
晶との相互作用はカルボニル基、アミノ基、ヒドロキシ
ル基等の極性基との相互作用に比べると弱（、配向方位
規制力が弱いため、双安定なメモリ効果が得られる。ま
たポリエチレン等に比べると液晶との相互作用は強いた
め、均一配向性も充分である。さらに結晶性であるため
に、液晶配向の熱安定性も優れている。In the liquid crystal display element of the present invention, a crystalline polystyrene film subjected to uniaxial alignment treatment is used as the alignment film. The side chain benzene ring of polystyrene contributes to the alignment of the liquid crystal, and unlike the case where other uniaxially aligned polymer films are used, the liquid crystal is aligned in a direction perpendicular to the uniaxial alignment direction of the main chain. The interaction between the benzene ring and the liquid crystal is weaker than the interaction with polar groups such as carbonyl groups, amino groups, and hydroxyl groups (because the orientation control force is weak, a bistable memory effect can be obtained. Since the interaction with the liquid crystal is stronger than that of other materials, uniform alignment is also sufficient.Furthermore, since it is crystalline, the thermal stability of liquid crystal alignment is also excellent.
実施例
ポリスチレンは通常非晶性であるが、アイソタクチック
な立体規則性をもつポリスチレンは結晶性となる。アタ
クチックまたはシンジオタクチックな非品性ポリスチレ
ンのラビング膜を液晶配向膜として用いた場合、室温で
は均一配向が得られる。しかし４０℃程度以上の温度で
液晶を注入した場合、ポリスチレン分子のミクロブラウ
ン運動の影響で均一配向が得られない。一方、結晶性ポ
リスチレンの場合は、１５０℃以上の温度まで液晶の均
一配向が得られる。Example Polystyrene is normally amorphous, but polystyrene with isotactic stereoregularity is crystalline. When a rubbing film of non-atactic or syndiotactic polystyrene is used as a liquid crystal alignment film, uniform alignment can be obtained at room temperature. However, when liquid crystal is injected at a temperature of about 40° C. or higher, uniform alignment cannot be obtained due to the influence of micro-Brownian motion of polystyrene molecules. On the other hand, in the case of crystalline polystyrene, uniform alignment of liquid crystals can be obtained up to temperatures of 150° C. or higher.
以下に具体的な実施例をもって本発明の説明を行う。The present invention will be explained below using specific examples.
実施例１
配向膜として結晶性ポリスチレンを用いて第１図に示し
たセル構造を有する５ＳＦＬＣ素子を作成した。用いた
ポリスチレンは、９０零アイソタクチツクポリスチレン
、平均分子量４１５００、融点は２１０℃であった。ま
ずＩＴＯ電極２．８を有するガラス基板１．９上に、結
晶性ポリスチレンのトルエン溶液をスピンコードし、ｌ
０００Ａ厚みの配向膜３．４を形成した。１５０℃で６
０分間熱処理した後、ナイロン不織布を用いてラビング
処理を施した。これらをラビング方向が平行になるよう
に１．８μｍのスペーサ６を介して貼り合わせた。強誘
電性液晶７としてチッソ株式会社製Ｃ５−１０２２を８
０℃で注入し、１００℃に昇温後０．２℃／ｌｉｎの速
度で室温まで降温した。Ｃ５−１０２２は８４．９℃
７３．１℃５９．９℃
Ｌ →Ｃｈ −ＳｍＡ → カイラルＳ ｍ
Ｃの相転移系列をもつ液晶材料である。この素子のカイ
ラルＳ ｍ Ｃ相における配向は均一であった。Example 1 A 5SFLC device having the cell structure shown in FIG. 1 was fabricated using crystalline polystyrene as an alignment film. The polystyrene used was 90 zero isotactic polystyrene, average molecular weight 41,500, and melting point 210°C. First, a toluene solution of crystalline polystyrene was spin-coded onto a glass substrate 1.9 having an ITO electrode 2.8.
An alignment film 3.4 with a thickness of 000A was formed. 6 at 150℃
After heat treatment for 0 minutes, rubbing treatment was performed using a nylon nonwoven fabric. These were bonded together with a 1.8 μm spacer 6 in between so that the rubbing directions were parallel to each other. C5-1022 manufactured by Chisso Corporation was used as the ferroelectric liquid crystal 7.
The mixture was injected at 0°C, heated to 100°C, and then lowered to room temperature at a rate of 0.2°C/lin. C5-1022 is 84.9℃
73.1℃59.9℃ L →Ch -SmA → Chiral S m
It is a liquid crystal material with a C phase transition series. The orientation in the chiral S m C phase of this device was uniform.
ポリスチレン系の配向膜を用いた場合、コレステリック
液晶層〈以下ｃｈ相と略記する）及びスメクチックＡ液
晶層（以下Ｓ ｍ Ａ相と略記する）における液晶配向
方向は、ラビング方向と直交となる。一方のガラス基板
表面に、偏光板の偏光軸をラビングと直交方向から液晶
本来のチルト角２５°だけ傾けて貼り、もう一方の基板
にはこれと偏光軸が直交するように偏光板を貼り付けて
、５ＳＦＬＣ素子を形成した。この素子に第２図に示し
た電圧波形を印加した時の透過光強度の変化を第３図に
示した。When a polystyrene-based alignment film is used, the liquid crystal alignment direction in the cholesteric liquid crystal layer (hereinafter abbreviated as ch phase) and the smectic A liquid crystal layer (hereinafter abbreviated as S m A phase) is perpendicular to the rubbing direction. Paste the polarizing plate on the surface of one glass substrate with the polarizing axis of the polarizing plate tilted from the direction orthogonal to the rubbing by the original tilt angle of the liquid crystal by 25 degrees, and paste the polarizing plate on the other glass substrate so that the polarizing axis is perpendicular to this. Thus, a 5SFLC device was formed. FIG. 3 shows the change in transmitted light intensity when the voltage waveform shown in FIG. 2 was applied to this element.
一方の極性パルスを印加し、他方の極性パルスを印加す
る直前（メモリ時）の透過光強度の比、即ちメモリ時コ
ントラストは３０であった。 比較例１配向膜として非
晶性ポリスチレンを用いて実施例１と全く同様に第１図
に示したセル構造を有する５ＳＦＬＣ素子を作成した。The ratio of transmitted light intensity immediately before applying one polarity pulse and the other polarity pulse (during memory), that is, the contrast during memory, was 30. Comparative Example 1 A 5SFLC device having the cell structure shown in FIG. 1 was prepared in exactly the same manner as in Example 1 using amorphous polystyrene as an alignment film.
非品性ポリスチレンとしてはＨＲＭ−２−３１１（電気
化学工業■製）を用い、スピンコードにより１０００
Ａ厚みの配向膜を形成した。この素子においては、液晶
の均一配向が得られず、カイラルＳｍＣ相において、フ
ォーカルコニック組織のマルチドメインとなってしまっ
た。As non-grade polystyrene, HRM-2-311 (manufactured by Denki Kagaku Kogyo ■) was used, and 1000
An alignment film having a thickness of A was formed. In this device, uniform alignment of the liquid crystal could not be obtained, and the chiral SmC phase had a multi-domain focal conic structure.
比較例２
配向膜としてポリビニルアルコールを用いて実施例１と
同様に第１図に示したセル構造を有するＳ５ＦＬＣ素子
を作成した。ポリビニルアルコールとしてはポバール１
１７（株式会社クラレ製）を用い、膜厚８ｏｏＡｉ成し
た。偏光板の偏光軸はラビング方向から２５°の角度、
及びこれと直交方向に配置した。この素子に第２図の電
圧波形を印加した時の透過光強度変化を第４図に示した
。この素子のメモリ時コントラストは３であった。Comparative Example 2 An S5FLC device having the cell structure shown in FIG. 1 was produced in the same manner as in Example 1 using polyvinyl alcohol as an alignment film. Poval 1 as polyvinyl alcohol
17 (manufactured by Kuraray Co., Ltd.) to a film thickness of 8ooAi. The polarization axis of the polarizing plate is at an angle of 25° from the rubbing direction,
and arranged in a direction perpendicular to this. FIG. 4 shows the change in transmitted light intensity when the voltage waveform shown in FIG. 2 was applied to this element. The memory contrast of this element was 3.
比較例３
配向膜としてポリイミドを用いて比較例２と同様に第１
図に示したセル構造を有する５ＳＦＬＣ素子を作成した
。ポリイミドとしてはＰＩＸ−１４００（日立化成工業
■製）を用い、膜厚１０００ Ａ形成した。この素子に
第２図の電圧波形を印加した時の透過光強度変化は、比
較例２と同様であり、この素子のメモリ時コントラスト
は２．５であった。Comparative Example 3 The first film was prepared in the same way as Comparative Example 2 using polyimide as the alignment film.
A 5SFLC device having the cell structure shown in the figure was created. PIX-1400 (manufactured by Hitachi Chemical Co., Ltd.) was used as the polyimide, and a film thickness of 1000 A was formed. When the voltage waveform shown in FIG. 2 was applied to this element, the transmitted light intensity change was similar to that of Comparative Example 2, and the memory contrast of this element was 2.5.
実施例２
実施例１と同様にして作成したセルに、強誘電性液晶７
としてメルク社製ＺＬＩ−４１３９を７５℃で注入し、
０．２℃／ｇｉｉｎの速度で室温まで降温した。ＺＬＩ
−４１３９は
８２℃ ６５℃
■ → ｃｈ → カイラルＳ ｍ Ｃの相転移系列
をもつ液晶材料である。この素子のカイラルＳ ｍ Ｃ
相における配向は均一であり、第２図の電圧波形を印加
した時のメモリ時コントラストは２３であった。Example 2 Ferroelectric liquid crystal 7 was added to a cell prepared in the same manner as in Example 1.
Merck ZLI-4139 was injected at 75°C as
The temperature was lowered to room temperature at a rate of 0.2°C/giin. ZLI
-4139 is a liquid crystal material having a phase transition series of 82° C. 65° C. ■ → ch → chiral S m C. Chiral S m C of this element
The orientation in the phase was uniform, and the memory contrast was 23 when the voltage waveform shown in FIG. 2 was applied.
発明の効果
本発明によれば、液晶の・均一配向が得られ、メモリ性
に優れているため、単純マトリクス駆動で高コントラス
トの表示を得ることができる。Effects of the Invention According to the present invention, uniform alignment of liquid crystals can be obtained and excellent memory properties, so that a high contrast display can be obtained by simple matrix driving.
第１図は、本発明の一実施例における。液晶表示素子の
構成を表す断面図、第２図は、実施例及び比較例にいて
、双安定なメモリ性の有無を調べるために印加したパル
ス電圧波形を示す図、第３図及び第４図は、各々第２図
の波形を印加した時の実施例及び比較例の素子透過光強
度の変化を示したグラフである。
１．９・・・ガラス基板、 ２．８・・・ＩＴＯ電極、
３．４・・・配向膜、 ５・・・シール樹脂、 ６・
・・スペーサ、 ７・・・強誘電性液晶。
代理人の氏名 弁理士 粟野重孝 ほか１名第１図
宵２図
畔問
光透＠芋
腰
腰
ωFIG. 1 shows one embodiment of the present invention. FIG. 2 is a cross-sectional view showing the configuration of a liquid crystal display element, and FIGS. 3 and 4 are diagrams showing pulse voltage waveforms applied to examine the presence or absence of bistable memory properties in Examples and Comparative Examples. 2 is a graph showing changes in the intensity of light transmitted through the elements in the example and the comparative example when the waveforms shown in FIG. 2 are applied, respectively. 1.9...Glass substrate, 2.8...ITO electrode,
3.4...Alignment film, 5...Seal resin, 6.
...Spacer, 7...Ferroelectric liquid crystal. Name of agent: Patent attorney Shigetaka Awano and 1 other person Figure 1: Evening 2: Mitsuto Takato @Imo-Koshi-Koshi ω
Claims (2)
誘電性液晶表示素子。(1) A ferroelectric liquid crystal display element using crystalline polystyrene as a liquid crystal alignment film.
則性を有するポリスチレンであることを特徴とする特許
請求の範囲第１項に記載の強誘電性液晶表示素子。(2) The ferroelectric liquid crystal display element according to claim 1, wherein the crystalline polystyrene is polystyrene having isotactic stereoregularity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21307088A JPH0261616A (en) | 1988-08-26 | 1988-08-26 | Liquid crystal display element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21307088A JPH0261616A (en) | 1988-08-26 | 1988-08-26 | Liquid crystal display element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0261616A true JPH0261616A (en) | 1990-03-01 |
Family
ID=16633041
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21307088A Pending JPH0261616A (en) | 1988-08-26 | 1988-08-26 | Liquid crystal display element |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0261616A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008058691A (en) * | 2006-08-31 | 2008-03-13 | Seiko Epson Corp | Liquid crystal, method for manufacturing liquid crystal, substrate for liquid crystal, and projector |
-
1988
- 1988-08-26 JP JP21307088A patent/JPH0261616A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008058691A (en) * | 2006-08-31 | 2008-03-13 | Seiko Epson Corp | Liquid crystal, method for manufacturing liquid crystal, substrate for liquid crystal, and projector |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR19980020832A (en) | Manufacturing method of liquid crystal aligning film by magnetic field treatment | |
| KR100216160B1 (en) | Lcd element | |
| JPH085837A (en) | Optical compensation sheet, its production and liquid crystal display device using the same | |
| JPH01177016A (en) | Ferroelectric liquid crystal shutter | |
| EP0645662B1 (en) | A liquid crystal display device | |
| KR940008531B1 (en) | Light modulation element | |
| JPH02126230A (en) | Ferroelectric liquid crystal element | |
| JPH0261616A (en) | Liquid crystal display element | |
| JP3102972B2 (en) | Liquid crystal display device and method of manufacturing the same | |
| JPH02208633A (en) | Liquid crystal display device | |
| JPH01304424A (en) | Liquid crystal display element | |
| JP3102973B2 (en) | Liquid crystal display device and method of manufacturing the same | |
| JPH0210323A (en) | Ferroelectric liquid crystal display element | |
| JP2548390B2 (en) | Method for manufacturing ferroelectric liquid crystal panel | |
| JP2548592B2 (en) | Ferroelectric liquid crystal element | |
| JP2815415B2 (en) | Manufacturing method of ferroelectric liquid crystal panel | |
| JPS63109419A (en) | Liquid crystal panel | |
| JPH0261615A (en) | Liquid crystal display element | |
| JPH02217820A (en) | Ferroelectric high-polymer liquid crystal element | |
| JPS62161122A (en) | Ferroelectric liquid crystal element | |
| JPH01145628A (en) | Liquid crystal display element | |
| JPS63109418A (en) | Liquid crystal film and its production | |
| JPH07306421A (en) | Ferroelectric liquid crystal element | |
| JPH05297374A (en) | Liquid crystal display element and its display method | |
| JPH01137237A (en) | Ferroelectric liquid crystal display element |