JPH06175135A - Liquid crystal display element - Google Patents

Liquid crystal display element

Info

Publication number
JPH06175135A
JPH06175135A JP4330349A JP33034992A JPH06175135A JP H06175135 A JPH06175135 A JP H06175135A JP 4330349 A JP4330349 A JP 4330349A JP 33034992 A JP33034992 A JP 33034992A JP H06175135 A JPH06175135 A JP H06175135A
Authority
JP
Japan
Prior art keywords
liquid crystal
substrates
crystal display
amino acid
polypeptide
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
JP4330349A
Other languages
Japanese (ja)
Inventor
Yasushi Nakajima
靖 中島
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.)
Casio Computer Co Ltd
Original Assignee
Casio Computer Co 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 Casio Computer Co Ltd filed Critical Casio Computer Co Ltd
Priority to JP4330349A priority Critical patent/JPH06175135A/en
Publication of JPH06175135A publication Critical patent/JPH06175135A/en
Pending legal-status Critical Current

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  • Liquid Crystal (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

PURPOSE:To regulate the orientation direction of liquid crystal molecules and to enable uniform display without unequalness by forming the oriented films on at least one of substrates of protein consisting of polypeptide essentially consisting of amino acids of long side chains. CONSTITUTION:This liquid crystal display element is constituted by joining a pair of transparent substrates 1, 2 consisting of glass, etc., via a frame-shaped sealing material 3 and sealing a liquid crystal 10 into the region enclosed by the sealing material 3 between these two substrates 1 and 2. Transparent electrodes 4, 5 are respectively formed on the surfaces facing each other of the two substrates 1, 2. The electrode forming surfaces of the substrates 1, 2 are coated with transparent insulating films 6, 7 consisting of silicon oxide, etc. The horizontally oriented films 8, 9 are formed thereon. Both of these horizontally oriented films 8, 9 are formed of the protein consisting of the polypeptide essentially consisting of the amino acids of the long side chains. The film surfaces thereof are subjected to an orientation treatment by rubbing.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は液晶表示素子に関するも
のである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device.

【0002】[0002]

【従来の技術】液晶表示素子としては、一般に、TN
(ツイステッド・ネマティック)型、またはSTN(ス
ーパー・ツイステッド・ネマティック)型のものが利用
されている。
2. Description of the Related Art Generally, TN is used as a liquid crystal display device.
(Twisted nematic) type or STN (super twisted nematic) type is used.

【0003】これらの液晶表示素子は、透明電極と水平
配向膜とを形成した一対の透明基板間に液晶を封入した
もので、前記配向膜は例えばラビング法等によって配向
処理されており、液晶分子は、前記配向膜により配向方
向を規制され、両基板間においてツイスト配向してい
る。ところで、近年、これらの液晶表示素子の基板上に
設けられる水平配向膜の材料として、たんぱく質を用い
ることが提案されている。
In these liquid crystal display elements, liquid crystal is sealed between a pair of transparent substrates each having a transparent electrode and a horizontal alignment film formed thereon, and the alignment film is subjected to an alignment treatment by, for example, a rubbing method, and liquid crystal molecules. The orientation direction is regulated by the orientation film, and the two substrates are twist-oriented. By the way, in recent years, it has been proposed to use a protein as a material of a horizontal alignment film provided on a substrate of these liquid crystal display elements.

【0004】[0004]

【発明が解決しようとする課題】しかしながら、従来の
たんぱく質からなる配向膜は、液晶分子の配向方向を十
分に規制することができるが、その反面、液晶分子が配
向膜面に対するプレチルト角がほぼ0°のホモジニアス
配向状態で配向するため、液晶層に駆動電界を印加した
ときの液晶分子の立上り挙動の仕方が不安定になってし
まう。
However, the conventional alignment film made of protein can sufficiently regulate the alignment direction of the liquid crystal molecules, but on the other hand, the pretilt angle of the liquid crystal molecules with respect to the alignment film surface is almost 0. Since the liquid crystal molecules are aligned in a homogeneous alignment state of °, the manner of the rising behavior of liquid crystal molecules becomes unstable when a driving electric field is applied to the liquid crystal layer.

【0005】このため、上記配向膜を用いている液晶表
示素子は、電界を印加したときの液晶分子の立上り挙動
にリバースチルトと呼ばれる逆向きの立上りが生じて、
表示ムラが発生するという問題をもっていた。
Therefore, in the liquid crystal display element using the above-mentioned alignment film, the rising behavior of liquid crystal molecules when an electric field is applied has a reverse rising called a reverse tilt,
There was a problem that uneven display occurred.

【0006】本発明の目的は、液晶分子の配向方向を十
分に規制することができ、しかも液晶分子を配向膜面に
対し一様にプレチルトした状態に配向させて、ムラのな
い均一な表示を得ることができる液晶表示素子を提供す
ることにある。
An object of the present invention is to sufficiently control the orientation direction of liquid crystal molecules, and further to orient the liquid crystal molecules in a state of being pre-tilted uniformly with respect to the orientation film surface, so as to obtain a uniform display without unevenness. It is to provide a liquid crystal display device that can be obtained.

【0007】[0007]

【課題を解決するための手段】本発明の液晶表示素子
は、少なくとも一方の基板上の配向膜を、側鎖の長いア
ミノ酸を主成分とするポリペプチドよりなるたんぱく質
で形成したことを特徴とするものである。なお、前記ア
ミノ酸の側鎖の炭素原子数は2以上である。
The liquid crystal display device of the present invention is characterized in that the alignment film on at least one of the substrates is formed of a protein consisting of a polypeptide having an amino acid having a long side chain as a main component. It is a thing. The number of carbon atoms in the side chain of the amino acid is 2 or more.

【0008】[0008]

【作用】上記側鎖の長いアミノ酸を主成分とするポリペ
プチドよりなるたんぱく質で形成された配向膜は、液晶
分子の配向方向を十分に規制することができる配向規制
力をもっており、しかも、液晶分子を、配向膜面に対し
一様にプレチルトした状態に配向させる。これにより、
液晶分子のリバーストルトが防止され、ムラのない均一
な表示が得られる。
The alignment film formed of a protein consisting of a polypeptide having an amino acid with a long side chain as a main component has an alignment regulating force capable of sufficiently regulating the alignment direction of liquid crystal molecules, and moreover, the liquid crystal molecules. Are oriented so as to be uniformly pretilted with respect to the surface of the alignment film. This allows
The liquid crystal molecules are prevented from reverting and a uniform display can be obtained.

【0009】[0009]

【実施例】以下、本発明の一実施例を図面を参照して説
明する。図1は液晶表示素子の断面図である。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a liquid crystal display element.

【0010】この液晶表示素子は、ガラス等からなる一
対の透明基板1,2を枠状のシール材3を介して接合
し、この両基板1,2間のシール材3で囲まれた領域に
液晶10を封入したもので、上記両基板1,2の互いに
対向する面にはそれぞれ、透明電極4,5が形成されて
いる。
In this liquid crystal display element, a pair of transparent substrates 1 and 2 made of glass or the like are joined via a frame-shaped sealing material 3, and an area surrounded by the sealing material 3 between the substrates 1 and 2 is formed. A liquid crystal 10 is enclosed, and transparent electrodes 4 and 5 are formed on the surfaces of the substrates 1 and 2 which face each other.

【0011】また、この両基板1,2の電極形成面は、
酸化硅素等からなる透明な絶縁膜6,7で覆われてお
り、その上に水平配向膜8,9が形成されている。この
水平配向膜8,9は、いずれも、側鎖の長いアミノ酸を
主成分とするポリペプチドよりなるたんぱく質で形成さ
れており、その膜面にはラビングによる配向処理が施さ
れている。
The electrode forming surfaces of the two substrates 1 and 2 are
It is covered with transparent insulating films 6 and 7 made of silicon oxide or the like, and horizontal alignment films 8 and 9 are formed thereon. Each of the horizontal alignment films 8 and 9 is formed of a protein consisting of a polypeptide whose main component is an amino acid having a long side chain, and its film surface is subjected to an alignment treatment by rubbing.

【0012】これら配向膜8,9の配向処理方向(ラビ
ング方向)は所定角度ずれており、液晶10の分子は、
前記配向膜8,9により配向方向を規制されて、両基板
間においてツイスト配向している。なお、図1におい
て、11,12は両基板1,2の外面側に配置された一
対の偏光板である。上記配向膜8,9の材料である、側
鎖の長いアミノ酸を主成分とするポリペプチドは、例え
ば次の[一般式1]で表わされる。
The alignment treatment directions (rubbing directions) of these alignment films 8 and 9 are deviated by a predetermined angle, and the molecules of the liquid crystal 10 are
The alignment direction is regulated by the alignment films 8 and 9, and the two substrates are twist-aligned. In FIG. 1, reference numerals 11 and 12 denote a pair of polarizing plates arranged on the outer surface side of both substrates 1 and 2. A polypeptide whose main component is an amino acid having a long side chain, which is a material of the alignment films 8 and 9, is represented by, for example, the following [general formula 1].

【0013】[0013]

【化1】 すなわち、上記ポリペプチドは、次の[一般式2][Chemical 1] That is, the above-mentioned polypeptide has the following [general formula 2]:

【0014】[0014]

【化2】 [Chemical 2]

【0015】で表わされるアミノ酸(α−アミノ酸)を
ペプチド結合させて得られる。この場合、次の (1)〜
(6)式で示される各種アミノ酸のうちの、側鎖構造が単
純なアミノ酸 (1),(2) の少なくとも1つと、それら以
外の側鎖の長いアミノ酸 (3)〜(6) 等の1つまたは2つ
以上をペプチド結合させる。
It is obtained by peptide-bonding the amino acid (α-amino acid) represented by In this case, the following (1) ~
Among the various amino acids represented by the formula (6), at least one of the amino acids (1) and (2) having a simple side chain structure, and the other amino acids having long side chains (3) to (6), etc. One or two or more are peptide-bonded.

【0016】[0016]

【化3】 [Chemical 3]

【0017】上記 (1)〜 (6)式で示される各種アミノ酸
のうち、 (1)式で示されるアミノ酸はグリシン、 (2)式
で示されるアミノ酸はアラニンであり、これらは、側鎖
構造が単純なアミノ酸である。
Among the various amino acids represented by the above formulas (1) to (6), the amino acid represented by the formula (1) is glycine, the amino acid represented by the formula (2) is alanine, and these have a side chain structure. Is a simple amino acid.

【0018】また、 (3)式で示されるアミノ酸はメチオ
ニン、 (4)式で示されるアミノ酸はグルタミン酸、 (5)
式で示されるアミノ酸はアルギニン、 (6)式で示される
アミノ酸はチロシンであり、これらは、側鎖の炭素原子
数が2以上の側鎖の長いアミノ酸である。
The amino acid represented by formula (3) is methionine, the amino acid represented by formula (4) is glutamic acid, and (5)
The amino acid represented by the formula is arginine, the amino acid represented by the formula (6) is tyrosine, and these are long side chain amino acids having 2 or more carbon atoms in the side chain.

【0019】そして、上記ポリペプチドは、側鎖構造が
単純なアミノ酸であるグリシンとアラニンの少なくとも
1つを必須の成分(ポリペプチドを合成する上で必要)
とし、側鎖の長いアミノ酸であるメチオニン、グルタミ
ン酸、アルギニン、チロシンのうちの1つまたは2つ以
上を主成分としている。なお、側鎖の長いアミノ酸の成
分比率は50%以上が望ましい。
The above-mentioned polypeptide contains at least one of glycine and alanine, which are amino acids having a simple side chain structure, as an essential component (necessary for synthesizing the polypeptide).
And one or more of methionine, glutamic acid, arginine, and tyrosine, which are long side chain amino acids, as a main component. The component ratio of amino acids having long side chains is preferably 50% or more.

【0020】上記ポリペプチドは次のようにして得られ
る。その一つの方法は、上記 (1)〜(6)式で示される各
種アミノ酸のうち、ポリペプチドの合成に用いるアミノ
酸を、目的の順番で結合させるためには、まず二種類の
アミノ酸を選択し、その一つはエチルベンジルエステル
によりカルボキシル基を保護し、もう一つはベンジルオ
キシカルボニル基によりアミノ基を保護して、それぞれ
のアミノ酸誘導体を得る。さらに、温和な条件で反応さ
せるため、塩化物などによりカルボキシル基を反応性の
大きい誘導体に変え、これをアミノ基と反応させる。そ
の後、保護基を除去して遊離のペプチドを導く。これを
繰返して高分子量のポリペプチドを得る。
The above-mentioned polypeptide is obtained as follows. One of the methods is to first select two kinds of amino acids among the various amino acids represented by the above formulas (1) to (6) in order to combine the amino acids used for the synthesis of the polypeptide in a desired order. , One protects the carboxyl group with ethylbenzyl ester and the other protects the amino group with benzyloxycarbonyl group to obtain the respective amino acid derivatives. Furthermore, since the reaction is performed under mild conditions, the carboxyl group is converted into a highly reactive derivative with a chloride or the like, and this is reacted with an amino group. The protecting group is then removed, leading to the free peptide. This is repeated to obtain a high molecular weight polypeptide.

【0021】また、別の方法としては、一度に高分子量
のポリペプチドを得るよう、アミノ酸のN−カルボキシ
無水物の溶液重合法を用いてもよく、いずれの場合も、
重合条件を必要に応じて調整することにより、数個〜数
千個のアミノ酸がそれぞれ適量な割合で結合したポリペ
プチドが得られる。
As another method, a solution polymerization method of N-carboxyanhydride of amino acid may be used so as to obtain a high molecular weight polypeptide at a time. In any case,
By adjusting the polymerization conditions as necessary, a polypeptide in which several to several thousand amino acids are bound in appropriate proportions can be obtained.

【0022】そして、基板1,2上に形成する配向膜
8,9は、上記のようにして得られたポリペプチドを、
ジメチルホルムアミド、N−メチル−2−ピロリジン等
の溶媒に10%以下の固形分濃度に溶解し、その溶液を
例えばスピンコート法により基板回転数100〜500
0rpmで基板1,2上(絶縁膜6,7の上)に塗布
し、この塗布膜を乾燥させて形成する。なお、この配向
膜8,9は、数オングストローム〜数千オングストロー
ムの膜厚に形成し、その膜面を一方向にラビングにより
配向処理する。
The alignment films 8 and 9 formed on the substrates 1 and 2 are prepared by using the polypeptide obtained as described above.
It is dissolved in a solvent such as dimethylformamide or N-methyl-2-pyrrolidine to a solid content concentration of 10% or less, and the solution is spin-coated, for example, at a substrate rotation speed of 100 to 500.
It is applied onto the substrates 1 and 2 (on the insulating films 6 and 7) at 0 rpm, and the applied film is dried to form. The alignment films 8 and 9 are formed to have a film thickness of several angstroms to several thousand angstroms, and the film surface is aligned by rubbing in one direction.

【0023】このようにして形成した配向膜8,9は、
液晶分子の配向方向を十分に規制することができる配向
規制力をもっており、しかも、液晶分子を、配向膜面に
対し一様にプレチルトした状態に配向させる。このよう
に液晶分子にプレチルト角が付与されるのは、配向膜
8,9の材料であるポリペプチドの主成分が側鎖の長い
アミノ酸であるため、模式的に見ると、ポリペプチドの
主鎖が側鎖で覆い隠された状態になって、主鎖の親水性
が抑えられるためである。
The alignment films 8 and 9 thus formed are
It has an alignment regulating force capable of sufficiently regulating the alignment direction of the liquid crystal molecules, and further aligns the liquid crystal molecules in a state of being uniformly pretilted with respect to the alignment film surface. The reason why the pretilt angle is imparted to the liquid crystal molecules is that the main component of the polypeptide, which is the material of the alignment films 8 and 9, is an amino acid having a long side chain. This is because the side chains are hidden by the side chains, and the hydrophilicity of the main chain is suppressed.

【0024】そして、この実施例の液晶表示素子では、
液晶分子が配向膜8,9面に対して一様にプレチルトし
た状態に配向するため、電界を印加したときの液晶分子
の立上り挙動にリバースチルトと呼ばれる逆向きの立上
りが生じることはなく、したがってムラのない均一な表
示を得ることができる。
In the liquid crystal display element of this embodiment,
Since the liquid crystal molecules are aligned in a state of pretilting uniformly with respect to the surfaces of the alignment films 8 and 9, the rising behavior of the liquid crystal molecules when an electric field is applied does not have a reverse rising called a reverse tilt. It is possible to obtain a uniform display without unevenness.

【0025】なお、上記実施例では、ポリペプチドの成
分であるアミノ酸にα−アミノ酸を用いたが、ポリペプ
チドの成分は、β−アミノ酸やγ−アミノ酸であっても
よい。また、上記実施例では、両方の基板1,2の配向
膜8,9を側鎖の長いアミノ酸を主成分とするポリペプ
チドよりなるたんぱく質で形成しているが、この配向膜
8,9のうちのいずれかは、側鎖構造が単純なアミノ酸
(グリシンやアラニン)を主成分とするたんぱく質で形
成しても、またたんぱく質以外の例えばポリイミド系の
配向材で形成してもよい。
In the above examples, α-amino acid was used as the amino acid which is the component of the polypeptide, but the component of the polypeptide may be β-amino acid or γ-amino acid. Further, in the above-mentioned embodiment, the alignment films 8 and 9 of both substrates 1 and 2 are formed of a protein consisting of a polypeptide whose main component is an amino acid having a long side chain. Either of them may be formed of a protein containing an amino acid (glycine or alanine) having a simple side chain structure as a main component, or may be formed of, for example, a polyimide-based orientation material other than the protein.

【0026】[0026]

【発明の効果】本発明の液晶表示素子によれば、基板上
の配向膜を側鎖の長いアミノ酸を主成分とするポリペプ
チドよりなるたんぱく質で形成しているため、液晶分子
の配向方向を十分に規制することができ、しかも液晶分
子を配向膜面に対し一様にプレチルトした状態に配向さ
せて、ムラのない均一な表示を得ることができる。
According to the liquid crystal display element of the present invention, since the alignment film on the substrate is formed of a protein consisting of a polypeptide having an amino acid with a long side chain as a main component, the alignment direction of liquid crystal molecules is sufficient. The liquid crystal molecules can be aligned in a state of being pre-tilted uniformly with respect to the alignment film surface, and uniform display without unevenness can be obtained.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明の一実施例を示す液晶表示素子の断面
図。
FIG. 1 is a sectional view of a liquid crystal display element showing an embodiment of the present invention.

【符号の説明】[Explanation of symbols]

1,2…基板 4,5…電極 6,7…絶縁膜 8,9…側鎖の長いアミノ酸を主成分とするポリペプチ
ドからなる配向膜 10…液晶 11,12…偏光板
1, 2 ... Substrate 4, 5 ... Electrode 6, 7 ... Insulating film 8, 9 ... Alignment film made of a polypeptide whose main chain is an amino acid having a long side chain 10 ... Liquid crystal 11, 12 ... Polarizing plate

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】透明電極と水平配向膜とを形成した一対の
透明基板間に液晶を封入した液晶表示素子において、少
なくとも一方の基板上の配向膜を、側鎖の長いアミノ酸
を主成分とするポリペプチドよりなるたんぱく質で形成
したことを特徴とする液晶表示素子。
1. A liquid crystal display device in which a liquid crystal is sealed between a pair of transparent substrates having a transparent electrode and a horizontal alignment film, and the alignment film on at least one of the substrates is composed mainly of amino acids having a long side chain. A liquid crystal display device characterized by being formed of a protein composed of a polypeptide.
【請求項2】前記アミノ酸の側鎖の炭素原子数は2以上
であることを特徴とする請求項1に記載の液晶表示素
子。
2. The liquid crystal display device according to claim 1, wherein the side chain of the amino acid has 2 or more carbon atoms.
JP4330349A 1992-12-10 1992-12-10 Liquid crystal display element Pending JPH06175135A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4330349A JPH06175135A (en) 1992-12-10 1992-12-10 Liquid crystal display element

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4330349A JPH06175135A (en) 1992-12-10 1992-12-10 Liquid crystal display element

Publications (1)

Publication Number Publication Date
JPH06175135A true JPH06175135A (en) 1994-06-24

Family

ID=18231627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4330349A Pending JPH06175135A (en) 1992-12-10 1992-12-10 Liquid crystal display element

Country Status (1)

Country Link
JP (1) JPH06175135A (en)

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