JPH09211463A - Manufacture of liquid crystal display device - Google Patents
Manufacture of liquid crystal display deviceInfo
- Publication number
- JPH09211463A JPH09211463A JP1532496A JP1532496A JPH09211463A JP H09211463 A JPH09211463 A JP H09211463A JP 1532496 A JP1532496 A JP 1532496A JP 1532496 A JP1532496 A JP 1532496A JP H09211463 A JPH09211463 A JP H09211463A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- acrylate monomer
- phase
- ferroelectric
- 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
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- Liquid Crystal (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示素子、特
に強誘電性液晶表示素子の製造法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a method of manufacturing a ferroelectric liquid crystal display device.
【０００２】[0002]
【従来の技術】クラーク及びラガーウオルにより提案さ
れた強誘電性液晶を用いた液晶表示素子（特開昭５６−
１０７２１６号公報に記載）は双安定性を有し、かつ電
界の変化に対する応答が高速であることから、大画面で
高精細な液晶表示素子としての応用が期待されている。
しかしながら、この強誘電性液晶表示素子では、欠陥の
無い均一な強誘電性液晶の配向状態を実現するのが難し
いという問題があった。例えば、強誘電性液晶、即ちカ
イラルスメクチックＣ液晶の層構造は液晶セル中におい
て「く」の字に折れ曲がったシェブロン構造をとる傾向
があり、この「く」の字に折れ曲がる方向によってＣ１
配向またＣ２配向と区別される二つの配向状態が存在し
えるが、Ｃ１配向かＣ２配向のどちらか一方の均一な配
向状態を得るのが困難であった。また、カイラルスメク
チックＣ液晶の層構造を、なるべく「く」の字に折れ曲
がらない、つまり層構造をシェブロン構造に近い構造、
望ましくはシェブロン構造に制御する必要があるが、こ
れも実現が困難であった。2. Description of the Related Art A liquid crystal display device using a ferroelectric liquid crystal proposed by Clark and Lagerwall (JP-A-56-56).
(Described in Japanese Patent No. 107216) has bistability and has a fast response to a change in an electric field, and thus is expected to be applied as a liquid crystal display device having a large screen and high definition.
However, this ferroelectric liquid crystal display element has a problem that it is difficult to realize a uniform ferroelectric liquid crystal alignment state without defects. For example, the layer structure of a ferroelectric liquid crystal, that is, a chiral smectic C liquid crystal, tends to have a chevron structure in which a "C" is bent in a liquid crystal cell, and C1 is changed depending on the direction in which the "C" is bent.
There may be two orientation states that are distinguished from the orientation or the C2 orientation, but it was difficult to obtain a uniform orientation state of either the C1 orientation or the C2 orientation. In addition, the layer structure of the chiral smectic C liquid crystal is not bent as much as possible in a “C” shape, that is, the layer structure is close to a chevron structure,
Desirably, it is necessary to control the chevron structure, but this is also difficult to realize.
【０００３】以上のような均一な配向状態を得るのが困
難であるという課題を解決する手段として、非常に高い
プレチルト角を与える配向膜を用いる方法や、ある特定
の化学構造を有する強誘電性液晶化合物を使用する方法
も知られてはいるが、これらは材料面での制約が多いと
いう問題があり、広く実用化されるには至っていない。As a means for solving the problem that it is difficult to obtain a uniform alignment state as described above, a method of using an alignment film that gives a very high pretilt angle or a ferroelectric having a specific chemical structure is used. Although a method using a liquid crystal compound is also known, these methods have a problem that there are many restrictions in terms of materials, and have not been widely put into practical use.
【０００４】[0004]
【本発明が解決しようとする課題】本発明が解決しよう
とする課題は、強誘電性液晶を用いた液晶表示素子にお
いて、液晶材料及び配向膜の材料面での制約をうけるこ
となくカイラルスメクチックＣ液晶の層構造が均一なＣ
１配向であり、また、よりシェブロン構造に近い構造を
実現する液晶表示素子の製造方法を提供することにあ
る。The problem to be solved by the present invention is, in a liquid crystal display device using a ferroelectric liquid crystal, a chiral smectic C without being restricted by the material surfaces of the liquid crystal material and the alignment film. C with a uniform liquid crystal layer structure
It is an object of the present invention to provide a method of manufacturing a liquid crystal display device which has one orientation and realizes a structure closer to a chevron structure.
【０００５】[0005]
【課題を発明するための手段】本発明者等は上記課題を
解決するために、液晶素子の構成要素の一つである液晶
組成物に着目し鋭意検討した結果、かかる課題が液晶組
成物中に液晶性アクリレートモノマーを含有させること
により解決できることを見いだし本発明を提供する至っ
た。In order to solve the above-mentioned problems, the present inventors have focused their attention on a liquid crystal composition, which is one of the constituent elements of a liquid crystal element, and as a result, have studied, It has been found that the problem can be solved by incorporating a liquid crystalline acrylate monomer into the above, and the present invention has been provided.
【０００６】このような製造方法として、本発明な特に
以下の２つの製造方法、即ち、 （製造方法１） （１）電極層及び配向制御膜を有する第１の透明性基板
と、電極層及び配向制御膜を有する第２の基板の間に、
液晶性アクリレートモノマー及び強誘電性液晶材料を含
有してなる液晶組成物を介在させる第１工程、及び
（２）介在させた液晶組成物がスメクチックＡ相を示す
状態で、第１の透明性基板の側から光を照射することに
より、液晶性アクリレートモノマーを高分子化させる第
２工程 （製造方法２） （１）電極層及び配向制御膜を有する２枚の透明性基板
の間に、液晶性アクリレートモノマー及び強誘電性液晶
材料を含有してなる液晶組成物を介在させる第１工程、
及び（２）介在させた液晶組成物がスメクチックＡ相を
示す状態で、光を照射することにより、液晶性アクリレ
ートモノマーを高分子化させる第２工程を有する液晶表
示素子の製造方法を提供する。As such a manufacturing method, particularly the following two manufacturing methods of the present invention, namely (manufacturing method 1) (1) a first transparent substrate having an electrode layer and an orientation control film, an electrode layer and Between the second substrate having the orientation control film,
A first step of interposing a liquid crystal composition containing a liquid crystal acrylate monomer and a ferroelectric liquid crystal material; and (2) a first transparent substrate in a state where the intervening liquid crystal composition exhibits a smectic A phase. Second step of polymerizing a liquid crystalline acrylate monomer by irradiating light from the side of (2) (Production method 2) (1) Liquid crystallinity is provided between two transparent substrates having an electrode layer and an orientation control film. A first step of interposing a liquid crystal composition containing an acrylate monomer and a ferroelectric liquid crystal material;
And (2) a method for producing a liquid crystal display device, which comprises a second step of polymerizing a liquid crystalline acrylate monomer by irradiating light in a state where the interposed liquid crystal composition exhibits a smectic A phase.
【０００７】本発明の製造方法は、液晶性アクリレート
モノマーの液晶性骨格の配向方向を配向制御膜の容易軸
方向と一致させるために、液晶性モノマー及び強誘電性
液晶を含有する液晶組成物がスメクチックＡ相を示す温
度を保ち、液晶性アクリレートモノマーを容易軸方向に
一軸配向させた状態で、紫外線もしくは電子線等の光を
照射して硬化せしめることを特徴としている。従って、
液晶層中に含有される強誘電性液晶材料は、通常この技
術分野で強誘電性液晶と認識されるものであれば特に制
限なく使用することができるが、カイラルスメクチック
Ｃ相より上の温度領域でスメクチックＡ相を呈するもの
を使用するのが好ましく、更に好ましくは、良好な配向
状態を得るためスメクチックＣ相より上の温度領域でス
メクチックＡ相及びネマチック相を呈するものを使用す
るのが好ましい。通常、カイラルスメクチックＣ相を示
す温度領域は４０〜８０℃付近であるから、それより上
の温度領域で液晶性モノマー及び強誘電性液晶を含有す
る液晶組成物がスメクチックＡ相を示すためには６０℃
以上の温度範囲であることが好ましい。また、液晶層中
の強誘電液晶材料の濃度は、９０〜９９．９重量％であ
ることが好ましく、９３〜９９．５重量％であることが
より好ましく、更には９５〜９９重量％であることがよ
り好ましい。In order to make the alignment direction of the liquid crystal skeleton of the liquid crystal acrylate monomer coincident with the easy axis direction of the alignment control film, the production method of the present invention uses a liquid crystal composition containing a liquid crystal monomer and a ferroelectric liquid crystal. It is characterized in that the liquid crystal acrylate monomer is uniaxially oriented in the easy axis direction while being kept at a temperature exhibiting a smectic A phase, and is cured by irradiation with light such as ultraviolet rays or electron beams. Therefore,
The ferroelectric liquid crystal material contained in the liquid crystal layer can be used without particular limitation as long as it is generally recognized as a ferroelectric liquid crystal in this technical field, but it is in the temperature range above the chiral smectic C phase. It is preferable to use those exhibiting a smectic A phase, and more preferably those exhibiting a smectic A phase and a nematic phase in a temperature region above the smectic C phase in order to obtain a good orientation state. Usually, the temperature range showing the chiral smectic C phase is around 40 to 80 ° C., so that the liquid crystal composition containing the liquid crystalline monomer and the ferroelectric liquid crystal shows the smectic A phase in the temperature range higher than that. 60 ° C
The above temperature range is preferable. The concentration of the ferroelectric liquid crystal material in the liquid crystal layer is preferably 90 to 99.9% by weight, more preferably 93 to 99.5% by weight, and further preferably 95 to 99% by weight. Is more preferable.
【０００８】また、液晶性アクリレートモノマーは、強
誘電性液晶の液晶性を損なわないように、液晶性アクリ
レートモノマーとして液晶性を有するものを使用するこ
とが好ましい。Further, as the liquid crystal acrylate monomer, it is preferable to use a liquid crystal acrylate monomer having a liquid crystal property so as not to impair the liquid crystal property of the ferroelectric liquid crystal.
【０００９】また、液晶性アクリレートモノマー及び強
誘電性液晶を含有する液晶組成物中における液晶性アク
リレートモノマーの濃度は、０．１から１０重量％に調
整するのが好ましく、０．５から７重量％に調製するの
が更に好ましく、１から５重量％が特に好ましい。も
し、液晶性アクリレートモノマーの濃度が０．１％より
低いと、均一なＣ１配向を安定に保てずにコントラスト
が低下し、１０重量％より高いとカイラルスメクチック
Ｃ液晶の電界に対する応答が妨げられる傾向が顕著にな
り、駆動電圧が増大してしまう。使用できる液晶性アク
リレートモノマーは、一般にこの技術分野で液晶性アク
リレートモノマーとして認識されるものであれば、特に
制限なく用いることができる。The concentration of the liquid crystal acrylate monomer in the liquid crystal composition containing the liquid crystal acrylate monomer and the ferroelectric liquid crystal is preferably adjusted to 0.1 to 10% by weight, and 0.5 to 7% by weight. %, More preferably 1 to 5% by weight. If the concentration of the liquid crystalline acrylate monomer is lower than 0.1%, the uniform C1 orientation cannot be stably maintained and the contrast is lowered, and if it is higher than 10% by weight, the response of the chiral smectic C liquid crystal to the electric field is disturbed. The tendency becomes remarkable and the driving voltage increases. The liquid crystal acrylate monomer that can be used can be used without particular limitation as long as it is generally recognized as a liquid crystal acrylate monomer in this technical field.
【００１０】また、使用する配向制御膜は従来用いられ
ているラビング処理を施したポリイミド配向膜を特に制
限なく用いることができる。またポリビニルシンナメー
ト薄膜に偏光紫外線を照射した、ラビング処理を施して
いない配向制御膜も用いることができる。As the orientation control film to be used, a conventionally used rubbing-treated polyimide orientation film can be used without particular limitation. Further, an alignment control film which is obtained by irradiating a polyvinyl cinnamate thin film with polarized ultraviolet rays and which is not subjected to a rubbing treatment can also be used.
【００１１】液晶層の厚さは、使用する強誘電液晶の屈
折率の異方性にも依存するが、１から４ミクロンである
ことが好ましく、１．５から３ミクロンが特に好まし
い。また、液晶性アクリレートモノマー及び強誘電性液
晶を含有する液晶組成物には、スメクチックＡ相におけ
る光硬化性組成物の光硬化を迅速に行う目的で、光重合
開始剤を添加してもよい。ここで使用することができる
光重合開始剤としては、例えば公知のベンゾインエーテ
ル類、ベンゾフェノン類、アセトフェノン類、ベンジル
ケタール類から選択して使用することができる。その添
加量は、液晶組成物中に含有される液晶性アクリレート
モノマーに対して、１０重量％以下であることが好まし
い。The thickness of the liquid crystal layer depends on the anisotropy of the refractive index of the ferroelectric liquid crystal used, but is preferably 1 to 4 μm, particularly preferably 1.5 to 3 μm. A photopolymerization initiator may be added to the liquid crystal composition containing the liquid crystal acrylate monomer and the ferroelectric liquid crystal for the purpose of rapidly photocuring the photocurable composition in the smectic A phase. As the photopolymerization initiator that can be used here, for example, known benzoin ethers, benzophenones, acetophenones, and benzyl ketals can be selected and used. The addition amount thereof is preferably 10% by weight or less with respect to the liquid crystal acrylate monomer contained in the liquid crystal composition.
【００１２】また、液晶性アクリレートモノマー及び強
誘電性液晶を含有する液晶組成物には、その保存安定性
を向上させる目的で、安定剤を添加してもよい。ここで
使用することができる安定剤としては、例えば公知のヒ
ドロキノン、ヒドロキノンモノアルキルエーテル類、第
三ブチルカテコール類等から選択して使用することがで
きる。またその添加量は、液晶組成物中に含有される光
硬化性組成物に対して０．０５重量％以下であることが
好ましい。A stabilizer may be added to the liquid crystal composition containing the liquid crystal acrylate monomer and the ferroelectric liquid crystal for the purpose of improving its storage stability. As the stabilizer that can be used here, for example, known hydroquinone, hydroquinone monoalkyl ethers, tert-butylcatechols and the like can be selected and used. Further, the addition amount thereof is preferably 0.05% by weight or less based on the photocurable composition contained in the liquid crystal composition.
【００１３】また、光硬化性組成物を高分子化させる行
程における紫外線または電子線の照射量は、使用する液
晶組成物及び光重合開始剤の濃度にも依存するが、５０
から１００００ｍＪ／ｃｍ2の範囲が好ましい。紫外線
または電子線の照射量が、５０ｍＪ／ｃｍ2以下である
と、光硬化性組成物が十分に硬化せず、製造後の経時変
化が大きくなってしまし、１００００ｍＪ／ｃｍ2以上
であると液晶組成物自体が劣化してしまう傾向がある。The irradiation dose of ultraviolet rays or electron beams in the process of polymerizing the photocurable composition depends on the concentrations of the liquid crystal composition and the photopolymerization initiator to be used, but is 50
To 10,000 mJ / cm 2 is preferable. If the irradiation dose of ultraviolet rays or electron beams is 50 mJ / cm 2 or less, the photocurable composition will not be sufficiently cured and the change over time after production will be large, and if it is 10,000 mJ / cm 2 or more. The liquid crystal composition itself tends to deteriorate.
【００１４】[0014]
【実施例】以下、本発明の実施例を示し、本発明を更に
詳細に説明する。しかしながら、本発明はこれらの実施
例に限定されるものではない。 （実施例１）厚さ０．１ｍｍのガラス基板の片面に、ポ
リイミド膜「ＬＰ−６４」（東レ製）を３００オングス
トロームの厚さで形成した後、ラビング処理を施してポ
リイミド配向膜付きガラス基板を得た。このようにして
得た２枚のポリイミド配向膜付き基板を、配向膜が形成
された面が内側になるようにして１．５ミクロンの間隔
をもって対向させて液晶セル（Ａ）を作製した。この
時、液晶セルの２枚の基板のラビング方向は、パラレル
方向になるように設定した。次に、液晶性アクリレート
モノマー「ＵＣＬ−００１ 」（大日本インキ化学工業
製）３重量部と強誘電性液晶「ＴＡ−Ｃ１００」（チッ
ソ製）９７重量部及び光重合開始剤「イルガキュア−６
５１」（チバガイギー製）０．０３重量部からなる液晶
組成物（Ｌ−１）を調製した。次に液晶セル（Ａ）を８
０℃に保ちながら、液晶組成物（Ｌ−１）を等方性液体
相のまま注入し、その後徐々に温度を５５℃まで下げる
ことにより、液晶組成物（Ｌ−１)を等方性液体相から
ネマチック相に、更にスメクチックＡ相まで相転移させ
た。液晶セル（Ａ）に注入した液晶組成物（Ｌ−１）を
５５℃に保ち、スメクチックＡ相を示している状態で、
中心波長３６５ｎｍで強度４０ｍＷ／ｃｍ2の紫外線を
照射して液晶組成物中に含有される光硬化性組成物を光
硬化させた。室温まで冷却後、得られた液晶素子を偏光
顕微鏡で観察したところ、均一なＣ１配向が得られてい
た。またこの液晶セル中の強誘電性液晶の層構造の傾き
角を、Ｘ線解析より見積もったところ約４度であった。 （比較例１）実施例１で作製したものと同じ液晶セル
（Ａ）を８０℃に保ちながら、強誘電性液晶「ＴＡ−Ｃ
１００」（チッソ製）を等方性液体相のまま注入し、そ
の後徐々に温度を室温まで下げることにより、強誘電性
液晶「ＴＡ−Ｃ１００」を等方性液体相からネマチック
相、スメクチックＡ相を経由させてカイラルスメクチッ
クＣ相まで相転移させた。得られた液晶素子を偏光顕微
鏡で観察したところ、Ｃ１配向とＣ２配向の２つの配向
状態が観察され、均一な配向状態が得られていなかっ
た。またこの液晶セル中の強誘電性液晶の層構造の傾き
角を、Ｘ線解析より見積もったところ約１５度であっ
た。The present invention will be described below in more detail with reference to Examples of the present invention. However, the invention is not limited to these examples. (Example 1) After forming a polyimide film "LP-64" (manufactured by Toray) with a thickness of 300 angstroms on one surface of a glass substrate with a thickness of 0.1 mm, a glass substrate with a polyimide alignment film was applied by rubbing treatment. Got The two substrates with a polyimide alignment film thus obtained were opposed to each other with an interval of 1.5 microns so that the surface on which the alignment film was formed faced inside to prepare a liquid crystal cell (A). At this time, the rubbing directions of the two substrates of the liquid crystal cell were set to be parallel directions. Next, 3 parts by weight of a liquid crystal acrylate monomer "UCL-001" (manufactured by Dainippon Ink and Chemicals), 97 parts by weight of a ferroelectric liquid crystal "TA-C100" (manufactured by Chisso) and a photopolymerization initiator "Irgacure-6".
51 "(manufactured by Ciba Geigy) was prepared, and a liquid crystal composition (L-1) was prepared. Next, the liquid crystal cell (A)
While maintaining the liquid crystal composition (L-1) at 0 ° C., the liquid crystal composition (L-1) was injected in the isotropic liquid phase, and then the temperature was gradually lowered to 55 ° C. The phase was changed from the phase to the nematic phase and further to the smectic A phase. While maintaining the liquid crystal composition (L-1) injected into the liquid crystal cell (A) at 55 ° C. and showing a smectic A phase,
The photocurable composition contained in the liquid crystal composition was photocured by irradiation with ultraviolet light having a central wavelength of 365 nm and an intensity of 40 mW / cm 2 . After cooling to room temperature, the obtained liquid crystal element was observed with a polarizing microscope to find that uniform C1 orientation was obtained. The tilt angle of the layer structure of the ferroelectric liquid crystal in this liquid crystal cell was estimated by X-ray analysis and found to be about 4 degrees. (Comparative Example 1) While maintaining the same liquid crystal cell (A) as that manufactured in Example 1 at 80 ° C, the ferroelectric liquid crystal "TA-C" was used.
100 "(manufactured by Chisso) is injected in the isotropic liquid phase, and then the temperature is gradually lowered to room temperature, whereby the ferroelectric liquid crystal" TA-C100 "is changed from the isotropic liquid phase to the nematic phase or the smectic A phase. Through the phase transition to the chiral smectic C phase. When the obtained liquid crystal element was observed with a polarization microscope, two alignment states of C1 alignment and C2 alignment were observed, and a uniform alignment state was not obtained. The tilt angle of the layer structure of the ferroelectric liquid crystal in this liquid crystal cell was estimated by X-ray analysis to be about 15 degrees.
【００１５】以上の実施例１及び比較例１より、本発明
の液晶表示素子は、均一なＣ１配向を実現したものであ
り、また強誘電性液晶の層構造の傾きも約４度と小さい
ことから、比較例の従来の強誘電性液晶素子と比較して
シェブロン構造により近い層構造を実現したものである
ことがわかる。 （実施例２）ＩＴＯ（インジウムチンオキサイド）透明
電極を形成した厚さ１．１ｍｍのガラス基板の片面に、
ポリイミド膜「 ＬＰ−６４」（東レ製）を１５０オン
グストロームの厚さで形成した後、ラビング処理を施し
てポリイミド配向膜付きガラス基板を得た。このように
して得た２枚のポリイミド配向膜付き基板を、配向膜が
形成された面が内側になるようにして１．５ミクロンの
間隔をもって対向させて液晶セル（Ｂ）を作製した。こ
の時、液晶セルの２枚の基板のラビング方向は、パラレ
ル方向になるように設定した。From the above Example 1 and Comparative Example 1, the liquid crystal display device of the present invention realizes uniform C1 orientation, and the inclination of the layer structure of the ferroelectric liquid crystal is as small as about 4 degrees. From the above, it can be seen that a layer structure closer to the chevron structure is realized as compared with the conventional ferroelectric liquid crystal device of the comparative example. (Example 2) On one surface of a 1.1 mm-thick glass substrate on which an ITO (indium tin oxide) transparent electrode was formed,
After forming a polyimide film "LP-64" (manufactured by Toray Industries, Inc.) with a thickness of 150 angstrom, a rubbing process was performed to obtain a glass substrate with a polyimide alignment film. The two substrates with a polyimide alignment film thus obtained were opposed to each other with an interval of 1.5 μm so that the surface on which the alignment film was formed faced inside to prepare a liquid crystal cell (B). At this time, the rubbing directions of the two substrates of the liquid crystal cell were set to be parallel directions.
【００１６】次に液晶セル（Ｂ）を８０℃に保ちなが
ら、実施例１で調製した液晶組成物（Ｌ−１）を等方性
液体相のまま注入し、その後徐々に温度を５５℃まで下
げることにより、液晶組成物（Ｌ−１)を等方性液体相
からネマチック相に、更にスメクチックＡ相まで相転移
させた。液晶セル（Ｂ）に注入した液晶組成物（Ｌ−
１）を５５℃に保ち、スメクチックＡ相を示している状
態で、中心波長３６５ｎｍで強度４０ｍＷ／ｃｍ2の紫
外線を照射して液晶組成物中に含有される光硬化性組成
物を光硬化させた。室温まで冷却後、得られた液晶素子
を偏光顕微鏡で観察したところ、均一なＣ１配向が得ら
れていることがわかった。また、強誘電性液晶の配向方
向は、ポリイミド配向膜のラビング方向と約８度の角度
ずれていることもわかった。更に、偏光顕微鏡下で、得
られた液晶素子を透明点付近まで昇温することにより、
液晶性アクリレート硬化物の液晶骨格の配向を観察した
ところ、液晶性アクリレート硬化物の液晶骨格の配向
は、ポリイミド配向膜のラビング方向と同じであること
がわかった。従って、強誘電性液晶の配向と液晶性アク
リレート硬化物の液晶骨格の配向方向は異なっているこ
とが確かめられた。 （比較例２）実施例２で作製したものと同じ液晶セル
（Ｂ）を８０℃に保ちながら、強誘電性液晶「ＴＡ−Ｃ
１００」（チッソ製）を等方性液体相のまま注入し、そ
の後徐々に温度を室温まで下げることにより、強誘電性
液晶「ＴＡ−Ｃ１００」を等方性液体相からネマチック
相、スメクチックＡ相を経由させてカイラルスメクチッ
クＣ相まで相転移させた。得られた液晶素子を偏光顕微
鏡で観察したところ、Ｃ１配向とＣ２配向の２つの配向
状態が観察され、均一な配向状態が得られていなかっ
た。Next, while maintaining the liquid crystal cell (B) at 80 ° C., the liquid crystal composition (L-1) prepared in Example 1 was injected in the isotropic liquid phase, and then the temperature was gradually raised to 55 ° C. By lowering it, the liquid crystal composition (L-1) was allowed to undergo a phase transition from the isotropic liquid phase to the nematic phase and further to the smectic A phase. A liquid crystal composition (L-
1) is kept at 55 ° C., and in the state showing the smectic A phase, the photocurable composition contained in the liquid crystal composition is photocured by irradiation with ultraviolet rays having a central wavelength of 365 nm and an intensity of 40 mW / cm 2. It was After cooling to room temperature, the obtained liquid crystal element was observed with a polarizing microscope, and it was found that uniform C1 orientation was obtained. It was also found that the alignment direction of the ferroelectric liquid crystal was deviated from the rubbing direction of the polyimide alignment film by about 8 degrees. Furthermore, by heating the obtained liquid crystal element near the clearing point under a polarizing microscope,
The orientation of the liquid crystal skeleton of the liquid crystalline acrylate cured product was observed, and it was found that the orientation of the liquid crystal skeleton of the liquid crystalline acrylate cured product was the same as the rubbing direction of the polyimide alignment film. Therefore, it was confirmed that the orientation of the ferroelectric liquid crystal and the orientation direction of the liquid crystal skeleton of the cured liquid crystal acrylate were different. Comparative Example 2 While maintaining the same liquid crystal cell (B) as that manufactured in Example 2 at 80 ° C., the ferroelectric liquid crystal “TA-C” was used.
100 "(manufactured by Chisso) is injected in the isotropic liquid phase as it is, and then the temperature is gradually lowered to room temperature, whereby the ferroelectric liquid crystal" TA-C100 "is changed from the isotropic liquid phase to the nematic phase or the smectic A phase. Via the phase transition to the chiral smectic C phase. When the obtained liquid crystal element was observed with a polarization microscope, two alignment states of C1 alignment and C2 alignment were observed, and a uniform alignment state was not obtained.
【００１７】第１図に実施例２で作製した本発明の液晶
表示素子の電気光学特性及び比較例２で作製した従来の
強誘電性液晶素子の電気光学特性との比較を示した。こ
れから、本発明の液晶表示素子は、従来の強誘電性液晶
素子と比較してコントラストが高く、また駆動電圧も低
減されたものであることがわかる。FIG. 1 shows a comparison between the electro-optical characteristics of the liquid crystal display element of the present invention manufactured in Example 2 and the electro-optical characteristics of the conventional ferroelectric liquid crystal element manufactured in Comparative Example 2. From this, it can be seen that the liquid crystal display element of the present invention has a higher contrast and a lower driving voltage than the conventional ferroelectric liquid crystal element.
【００１８】[0018]
【発明の効果】本発明の液晶表示素子は、強誘電性液晶
を用いた表示素子において、材料の制約をうけることな
く、容易に均一なＣ１配向状態をえることができ、また
強誘電性液晶の層構造としてもシェブロン構造に近い構
造を達成できる。そのため、高いコントラストを得るこ
とができる。INDUSTRIAL APPLICABILITY The liquid crystal display device of the present invention is a display device using a ferroelectric liquid crystal and can easily obtain a uniform C1 orientation state without being restricted by the material, and further, a ferroelectric liquid crystal. As a layer structure of, it is possible to achieve a structure close to a chevron structure. Therefore, high contrast can be obtained.
【図１】実施例２における本発明の液晶表示素子及び比
較例２における従来の液晶素子の電気光学特性を示した
図である。FIG. 1 is a diagram showing electro-optical characteristics of a liquid crystal display element of the present invention in Example 2 and a conventional liquid crystal element in Comparative Example 2.
Claims (3)
１の透明性基板と、電極層及び配向制御膜を有する第２
の基板の間に、液晶性アクリレートモノマー及び強誘電
性液晶材料を含有してなる液晶組成物を介在させる第１
工程、及び（２）介在させた液晶組成物がスメクチック
Ａ相を示す状態で、第１の透明性基板の側から光を照射
することにより、液晶性アクリレートモノマーを高分子
化させる第２工程を有する液晶表示素子の製造方法。1. A first transparent substrate having an electrode layer and an orientation control film, and a second transparent substrate having an electrode layer and an orientation control film.
A liquid crystal composition containing a liquid crystal acrylate monomer and a ferroelectric liquid crystal material is interposed between the substrates.
And (2) a second step of polymerizing the liquid crystalline acrylate monomer by irradiating light from the first transparent substrate side in a state where the interposed liquid crystal composition exhibits a smectic A phase. The manufacturing method of the liquid crystal display element which has.
枚の透明性基板の間に、液晶性アクリレートモノマー及
び強誘電性液晶材料を含有してなる液晶組成物を介在さ
せる第１工程、及び（２）介在させた液晶組成物がスメ
クチックＡ相を示す状態で、光を照射することにより、
液晶性アクリレートモノマーを高分子化させる第２工程
を有する液晶表示素子の製造方法。2. (1) 2 having an electrode layer and an orientation control film
A first step in which a liquid crystal composition containing a liquid crystal acrylate monomer and a ferroelectric liquid crystal material is interposed between a pair of transparent substrates, and (2) the interposed liquid crystal composition exhibits a smectic A phase. By irradiating light in the state,
A method for producing a liquid crystal display device, comprising a second step of polymerizing a liquid crystal acrylate monomer.
マーの濃度が０．１〜１０重量％であることを特徴とす
る請求項１又は２記載の液晶表示素子の製造法。3. The method for producing a liquid crystal display device according to claim 1, wherein the concentration of the liquid crystal acrylate monomer in the liquid crystal composition is 0.1 to 10% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1532496A JPH09211463A (en) | 1996-01-31 | 1996-01-31 | Manufacture of liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1532496A JPH09211463A (en) | 1996-01-31 | 1996-01-31 | Manufacture of liquid crystal display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09211463A true JPH09211463A (en) | 1997-08-15 |
Family
ID=11885602
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1532496A Pending JPH09211463A (en) | 1996-01-31 | 1996-01-31 | Manufacture of liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09211463A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001033842A (en) * | 1999-07-15 | 2001-02-09 | Science Univ Of Tokyo | Production of optical operational element using liquid crystal photodiode |
| KR20010065035A (en) * | 1999-12-21 | 2001-07-11 | 구본준, 론 위라하디락사 | Method for fabrication a liquid crystal display device |
| JP2002229071A (en) * | 2001-01-31 | 2002-08-14 | Shunsuke Kobayashi | Method of manufacturing liquid crystal display element |
| KR100542082B1 (en) * | 1999-12-20 | 2006-01-10 | 엘지.필립스 엘시디 주식회사 | Method for fabricating a liquid crystal cell |
| JP2006039519A (en) * | 2004-06-21 | 2006-02-09 | Dainippon Printing Co Ltd | Liquid crystal display element |
| JP2008248061A (en) * | 2007-03-30 | 2008-10-16 | Dic Corp | Polymer-stabilizing liquid crystal composition and polymer-stabilized liquid crystal-displaying element |
| WO2008123235A1 (en) | 2007-03-30 | 2008-10-16 | Dic Corporation | Polymer-stabilized liquid crystal composition, liquid crystal display, and process for production of liquid crystal display |
| JP2008276197A (en) * | 2007-03-30 | 2008-11-13 | Dic Corp | Polymer-stabilized ferroelectric liquid crystal composition and liquid crystal display device |
-
1996
- 1996-01-31 JP JP1532496A patent/JPH09211463A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001033842A (en) * | 1999-07-15 | 2001-02-09 | Science Univ Of Tokyo | Production of optical operational element using liquid crystal photodiode |
| KR100542082B1 (en) * | 1999-12-20 | 2006-01-10 | 엘지.필립스 엘시디 주식회사 | Method for fabricating a liquid crystal cell |
| KR20010065035A (en) * | 1999-12-21 | 2001-07-11 | 구본준, 론 위라하디락사 | Method for fabrication a liquid crystal display device |
| JP2002229071A (en) * | 2001-01-31 | 2002-08-14 | Shunsuke Kobayashi | Method of manufacturing liquid crystal display element |
| JP4667610B2 (en) * | 2001-01-31 | 2011-04-13 | 駿介 小林 | Manufacturing method of liquid crystal display element |
| JP2006039519A (en) * | 2004-06-21 | 2006-02-09 | Dainippon Printing Co Ltd | Liquid crystal display element |
| JP4699100B2 (en) * | 2004-06-21 | 2011-06-08 | 大日本印刷株式会社 | Liquid crystal display element |
| JP2008248061A (en) * | 2007-03-30 | 2008-10-16 | Dic Corp | Polymer-stabilizing liquid crystal composition and polymer-stabilized liquid crystal-displaying element |
| WO2008123235A1 (en) | 2007-03-30 | 2008-10-16 | Dic Corporation | Polymer-stabilized liquid crystal composition, liquid crystal display, and process for production of liquid crystal display |
| JP2008276197A (en) * | 2007-03-30 | 2008-11-13 | Dic Corp | Polymer-stabilized ferroelectric liquid crystal composition and liquid crystal display device |
| US8405799B2 (en) | 2007-03-30 | 2013-03-26 | Dic Corporation | Polymer-stabilized liquid crystal composition, liquid crystal display device, method for producing liquid crystal display device |
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