JP2003098553A - Ferroelectric liquid crystal display element and method for manufacturing the same - Google Patents
Ferroelectric liquid crystal display element and method for manufacturing the sameInfo
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- JP2003098553A JP2003098553A JP2001286349A JP2001286349A JP2003098553A JP 2003098553 A JP2003098553 A JP 2003098553A JP 2001286349 A JP2001286349 A JP 2001286349A JP 2001286349 A JP2001286349 A JP 2001286349A JP 2003098553 A JP2003098553 A JP 2003098553A
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- liquid crystal
- ferroelectric liquid
- crystal display
- display element
- ferroelectric
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示素子及び
その製造方法に係り、特に強誘電性液晶表示素子（ＦＬ
ＤＣ）及びその製造方法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 and a manufacturing method thereof, and more particularly to a ferroelectric liquid crystal display device (FL).
DC) and its manufacturing method.
【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）は、双安定性を有し、且つ電界の
変化に対する応答が高速であることから、大画面で高精
細な動画映像表示を可能にする液晶表示素子としての応
用が期待されている。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).
No. 107216) has bistability and has a fast response to a change in an electric field, and therefore is expected to be applied as a liquid crystal display device capable of displaying a high-definition moving image on a large screen. .
【０００３】また、先行技術としては、例えば、Ｊ．Ｋ
ａｎｂｅ ｅｔ ａｌ．：Ｆｅｒｒｏｅｌｅｃｔｒｉｃ
ｓ，１１４（１９９１）３，Ｊ．Ｘｕｅ ｅｔ ａ
ｌ．：Ｄｉｇ．Ｔｅｃｈ．Ｐａｐ．ＳＩＤ，３１（２０
００）１３が挙げられる。Further, as the prior art, for example, J. K
anbe et al. : Ferroelectric
s, 114 (1991) 3, J. Xue et a
l. : Dig. Tech. Pap. SID, 31 (20
00) 13.
【０００４】このように、強誘電性液晶ディスプレイ
（ＦＬＣＤ）は、高速応答性による動画映像の美しい表
示やメモリー性を利用した電子ペーパーへの応用が期待
される。As described above, the ferroelectric liquid crystal display (FLCD) is expected to be applied to electronic paper utilizing the beautiful display of moving images due to its high-speed response and the memory property.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記し
た従来の強誘電性液晶を用いた液晶表示素子は、強誘電
性液晶の均一な配向を得ることが困難であるという問題
があった。すなわち、ＦＬＣの配向制御は非常に複雑で
困難とされ、シェブロン層構造に由来するジグザグ欠陥
は電気光学的コントラスト・双安定メモリー性を大きく
低下させ、これがＦＬＣのディスプレイ応用にとって大
きな障害となっている。However, the above-mentioned conventional liquid crystal display device using the ferroelectric liquid crystal has a problem that it is difficult to obtain uniform alignment of the ferroelectric liquid crystal. That is, the alignment control of the FLC is very complicated and difficult, and the zigzag defects derived from the chevron layer structure greatly reduce the electro-optical contrast and bistable memory properties, which is a major obstacle for the FLC display application. .
【０００６】このジグザグ欠陥の形成メカニズムについ
て数多くの報告があるが、パラレルラビング配向セルの
冷却過程において、Ｓｍ（スメクティック）Ｃ* 相転移
時にまずＣ１シェブロン構造が形成され、その後、Ｃ２
構造への不均一な構造転移により両者が共存し、ジグザ
グ欠陥が形成される。Although there are many reports on the formation mechanism of this zigzag defect, in the cooling process of a parallel rubbing alignment cell, a C1 chevron structure is first formed at the Sm (smectic) C * phase transition, and then a C2 chevron structure is formed.
Due to the non-uniform structural transition to the structure, both coexist and a zigzag defect is formed.
【０００７】図８に示すように、Ｃ１構造のダイレクタ
ー分布はＣ２構造に比べ一様である反面、基板表面のダ
イレクターはラビング方向から外れている。そのため、
ＳｍＣ* 相に転移後、降温に伴ってＦＬＣのティルト角
が増大する過程で、表面アンカリングによりＣ１からＣ
２への構造転移が生じる。As shown in FIG. 8, the director distribution of the C1 structure is more uniform than that of the C2 structure, but the director on the substrate surface is deviated from the rubbing direction. for that reason,
After the transition to the SmC * phase, the tilt angle of FLC increases with decreasing temperature, and C1 to C
A structural transition to 2 occurs.
【０００８】図９は通常のＦＬＣセルの室温における偏
光顕微鏡写真（代用図面）である。この図から明らかな
ように降温過程において通常のＦＬＣセルではＳｍＡか
らＳｍＣ相（Ｃ１）に転移後、Ｃ１からＣ２への構造転
移がセル内で不均一に生じ、ジグザグ欠陥の発生が見ら
れる。FIG. 9 is a polarization microscope photograph (substitute drawing) of a conventional FLC cell at room temperature. As is clear from this figure, in the ordinary FLC cell during the temperature decreasing process, after the transition from the SmA to the SmC phase (C1), the structural transition from C1 to C2 occurs unevenly in the cell, and zigzag defects are observed.
【０００９】かかるジグザグ欠陥はＣ１−Ｃ２構造転移
に由来するため、この構造転移を阻止した一様なＣ１構
造の実現が望まれる。Since such zigzag defects are derived from the C1-C2 structural transition, it is desired to realize a uniform C1 structure that prevents this structural transition.
【００１０】本発明は、上記状況に鑑みて、強誘電性液
晶を用いた均一な配向を有する強誘電性液晶表示素子及
びその製造方法を提供することを目的とする。In view of the above situation, it is an object of the present invention to provide a ferroelectric liquid crystal display device using a ferroelectric liquid crystal and having a uniform alignment, and a method for manufacturing the same.
【００１１】[0011]
【課題を解決するための手段】本発明は、上記目的を達
成するために、強誘電性液晶のシェブロン層構造に着目
し、液晶組成物を基板面上に成膜させ、この液晶組成物
と異なる相転移温度を有する強誘電性液晶を一対の基板
間に挟持させる。すなわち、本発明では、図１に示すよ
うに、ＳｍＡ−ＳｍＣ* 相転移点を降下させた表面層を
有するハイブリッド構造の強誘電性液晶を用いた液晶表
示素子（ＦＬＣＤ）を提供する。この構造では、バルク
ＦＬＣのティルト角が増大しても、基板表面に近づくに
つれティルト角が減少し、Ｃ１−Ｃ２構造転移を抑制す
ることができる。In order to achieve the above object, the present invention focuses on a chevron layer structure of a ferroelectric liquid crystal, forms a liquid crystal composition on a substrate surface, and Ferroelectric liquid crystals having different phase transition temperatures are sandwiched between a pair of substrates. That is, the present invention provides a liquid crystal display device (FLCD) using a ferroelectric liquid crystal having a hybrid structure having a surface layer with a lowered SmA-SmC * phase transition point as shown in FIG. In this structure, even if the tilt angle of the bulk FLC increases, the tilt angle decreases as it approaches the substrate surface, and the C1-C2 structural transition can be suppressed.
【００１２】すなわち、
〔１〕一対の基板間に液晶層を挟持させる強誘電性液晶
表示素子において、前記一対の基板間の少なくとも一方
の基板面付近における前記液晶層の相転移温度を変調さ
せることを特徴とする。That is, [1] In a ferroelectric liquid crystal display device in which a liquid crystal layer is sandwiched between a pair of substrates, the phase transition temperature of the liquid crystal layer near at least one substrate surface between the pair of substrates is modulated. Is characterized by.
【００１３】〔２〕上記〔１〕記載の強誘電性液晶表示
素子において、前記液晶層が少なくとも強誘電性液晶を
含有することを特徴とする。[2] The ferroelectric liquid crystal display device according to the above [1], characterized in that the liquid crystal layer contains at least a ferroelectric liquid crystal.
【００１４】〔３〕上記〔１〕又は〔２〕記載の強誘電
性液晶表示素子において、前記液晶層が、相転移温度の
異なる少なくとも２種類の液晶組成物から構成されるこ
とを特徴とする。[3] In the ferroelectric liquid crystal display device according to the above [1] or [2], the liquid crystal layer is composed of at least two kinds of liquid crystal compositions having different phase transition temperatures. .
【００１５】〔４〕上記〔１〕、〔２〕又は〔３〕記載
の強誘電性液晶表示素子において、前記液晶層内におい
て、前記基板面付近とそれを除く領域の間で、少なくと
も２種類の液晶組成物の濃度勾配を生じさせることを特
徴とする。[4] In the ferroelectric liquid crystal display element according to the above [1], [2] or [3], at least two kinds are provided in the liquid crystal layer between the vicinity of the substrate surface and a region other than the substrate surface. And a concentration gradient of the liquid crystal composition.
【００１６】〔５〕一対の基板間に液晶層を挟持させる
強誘電性液晶表示素子の製造方法において、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、少なくとも一方の基板
面上に、第１の液晶組成物の薄膜を形成する第１の工程
と、前記第１の透明性基板と第２の基板との間に、第２
の液晶組成物を介在させる第２の工程とを有することを
特徴とする。[5] In a method of manufacturing a ferroelectric liquid crystal display device in which a liquid crystal layer is sandwiched between a pair of substrates, a first transparent substrate having an electrode layer and an alignment control film, and an electrode layer and an alignment control film are provided. Between the first step of forming a thin film of the first liquid crystal composition on at least one substrate surface of the second substrate and the first transparent substrate and the second substrate, Two
And a second step of interposing the liquid crystal composition.
【００１７】[0017]
【発明の実施の形態】まず、以下に本発明の一例を示
す。BEST MODE FOR CARRYING OUT THE INVENTION First, an example of the present invention will be described below.
【００１８】本発明の製造方法は、強誘電性液晶の２つ
のシェブロン層構造（Ｃ１構造及びＣ２構造）のうち、
Ｃ１構造のみを得るために、強誘電性液晶に対して相転
移温度を異にする液晶組成物の薄膜を予め基板面上に形
成し、次に、その基板間に強誘電性液晶を介在させるこ
とを特徴としている。つまり、本発明の製造方法で製造
された液晶表示素子は、２種類の液晶組成物から構成さ
れ、これらの組成物の間に濃度勾配が生じることによ
り、基板表面付近において液晶の相転移温度が変調され
た構造を有する。In the manufacturing method of the present invention, of the two chevron layer structures (C1 structure and C2 structure) of the ferroelectric liquid crystal,
In order to obtain only the C1 structure, a thin film of a liquid crystal composition having a phase transition temperature different from that of the ferroelectric liquid crystal is previously formed on the substrate surface, and then the ferroelectric liquid crystal is interposed between the substrates. It is characterized by that. That is, the liquid crystal display device manufactured by the manufacturing method of the present invention is composed of two kinds of liquid crystal compositions, and a concentration gradient occurs between these compositions, so that the phase transition temperature of the liquid crystal near the substrate surface is increased. It has a modulated structure.
【００１９】これにより、本発明の製造方法で製造され
た液晶表示素子においては、Ｃ２構造が抑制され、Ｃ１
構造のみの均一な配向が得られる。これは、強誘電性液
晶と配向制御膜の間に、強誘電性液晶に対して相転移温
度を異にする液晶組成物が介在することにより、強誘電
性液晶に対する配向制御膜の束縛力が低下した結果、そ
の束縛力に対してエネルギー的に有利なＣ２構造が抑制
されるためと考えられる。As a result, in the liquid crystal display element manufactured by the manufacturing method of the present invention, the C2 structure is suppressed and C1 structure is suppressed.
A uniform orientation of only the structure is obtained. This is because the binding force of the alignment control film to the ferroelectric liquid crystal is increased by interposing a liquid crystal composition having a different phase transition temperature with respect to the ferroelectric liquid crystal between the ferroelectric liquid crystal and the alignment control film. It is considered that as a result of the decrease, the C2 structure that is energetically favorable to the binding force is suppressed.
【００２０】以下、本発明についてさらに詳細に説明す
る。The present invention will be described in more detail below.
【００２１】本発明において使用する強誘電性液晶は、
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、強誘電相の
良好な配向状態を得るため、強誘電相より上の温度領域
でスメクティック（Ｓｍ）Ａ相又はネマティック（Ｎ
ｅ）相を呈するものを使用することが好ましい。The ferroelectric liquid crystal used in the present invention is
Any material that is generally recognized as a ferroelectric liquid crystal in this technical field can be used without particular limitation, but in order to obtain a good alignment state of the ferroelectric phase, smectic ( Sm) A phase or nematic (N
e) It is preferable to use one that exhibits a phase.
【００２２】また、本発明で使用する、強誘電性液晶に
対して相転移温度を異にする液晶組成物は、配向制御膜
の束縛力を効果的に低下させるように、強誘電性液晶に
対する相転移温度差が大きいものほど好ましい。Further, the liquid crystal composition used in the present invention, which has a phase transition temperature different from that of the ferroelectric liquid crystal, is effective in reducing the binding force of the alignment control film to the ferroelectric liquid crystal. The larger the difference in phase transition temperature, the more preferable.
【００２３】このような液晶組成物としては、Ｃ１構造
とＣ２構造の間の構造転移が生じる温度領域において、
スメクティックＡ相又はネマティック相を呈するものが
好ましく、さらに好ましくは、強誘電性液晶が強誘電相
を呈する温度領域において、スメクティックＡ相又はネ
マティック相を呈するものが好ましい。なぜなら、スメ
クティックＡ相又はネマティック相は、強誘電性液晶に
対する配向制御膜の束縛力を大きく低下させるためであ
る。Such a liquid crystal composition has a temperature range in which a structural transition between the C1 structure and the C2 structure occurs.
Those exhibiting a smectic A phase or a nematic phase are preferable, and those exhibiting a smectic A phase or a nematic phase are more preferable in the temperature range in which the ferroelectric liquid crystal exhibits a ferroelectric phase. This is because the smectic A phase or nematic phase greatly reduces the binding force of the alignment control film with respect to the ferroelectric liquid crystal.
【００２４】配向制御膜としては、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、有機薄膜に紫外線を照射し
た、この技術分野で光配向制御膜と呼ばれる配向制御膜
を用いることもできる。As the alignment control film, a conventionally used rubbing-treated polyimide alignment film can be used without particular limitation. Further, an alignment control film called an optical alignment control film in this technical field, which is obtained by irradiating an organic thin film with ultraviolet rays, can also be used.
【００２５】基板としては、薄膜トランジスタ付きガラ
ス基板、ＩＴＯ付きガラス基板、ＩＴＯ付きプラスチッ
ク基板等を使用することができる。これらの基板上にカ
ラーフィルター層が付与されているものも好適に使用す
ることができる。As the substrate, a glass substrate with a thin film transistor, a glass substrate with ITO, a plastic substrate with ITO or the like can be used. Those having a color filter layer provided on these substrates can also be suitably used.
【００２６】（実施例１）図２は本発明にかかるＳｍＡ
−ＳｍＣ相転移点を降下（変調）させた表面層を有する
強誘電性液晶表示素子の模式図である。Example 1 FIG. 2 shows SmA according to the present invention.
FIG. 3 is a schematic view of a ferroelectric liquid crystal display element having a surface layer in which a −SmC phase transition point is lowered (modulated).
【００２７】（１）ＩＴＯ透明電極付きの厚さ１ｍｍの
ガラス基板を用意し、透明電極面にポリイミド膜を３０
０Å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（Ｓ−１）１１を得た。(1) A glass substrate having a thickness of 1 mm with an ITO transparent electrode is prepared, and a polyimide film is formed on the transparent electrode surface.
After forming with a thickness of 0Å, rubbing treatment was performed to obtain a glass substrate (S-1) 11 with a polyimide alignment film.
【００２８】次に、室温においてスメクティックＡ相を
呈する液晶組成物「ＦＥＬＩＸ−０２０」（クラリアン
ト製）（Ｌ−１）０．１重量部及びアセトン９９．９重
量部からなる溶液（Ｍ）を調整した。Next, a solution (M) consisting of 0.1 part by weight of liquid crystal composition "FELIX-020" (manufactured by Clariant) (L-1) and 99.9 parts by weight of acetone, which exhibits a smectic A phase at room temperature, was prepared. did.
【００２９】次に、溶液（Ｍ）を、ガラス基板（Ｓ−
１）１１における配向膜が形成された面上にスピンコー
トし、その後アセトンを揮発させて、図２（ａ）に示す
ように、液晶組成物（Ｌ−１）の薄膜１２付きガラス基
板（Ｓ−２）１３を得た。この液晶組成物（Ｌ−１）の
薄膜１２の厚さは、偏光顕微鏡でその光学異方性が確認
されないほどの大きさであり、原子間力顕微鏡を用いた
測定より８０Åと見積もられた。Next, the solution (M) was added to a glass substrate (S-
1) The surface of 11 on which the alignment film is formed is spin-coated, and then acetone is volatilized to obtain a glass substrate (S) with a thin film 12 of the liquid crystal composition (L-1) as shown in FIG. -2) 13 was obtained. The thickness of the thin film 12 of the liquid crystal composition (L-1) was so large that its optical anisotropy could not be confirmed by a polarization microscope, and was estimated to be 80Å by measurement using an atomic force microscope. .
【００３０】（２）このようにして得た２枚のガラス基
板（Ｓ−２）１３を、配向膜が形成された面が内側にな
るようにして２μｍの間隔をもって対向させて、図２
（ｂ）に示すように、液晶セル（Ａ）１４を作製した。
このとき、液晶セル（Ａ）１４の２枚の基板１３，１３
のラビング方向は、パラレル方向になるように設定し
た。(2) The two glass substrates (S-2) 13 thus obtained were made to face each other with an interval of 2 μm so that the surface on which the alignment film was formed faced inward.
As shown in (b), a liquid crystal cell (A) 14 was produced.
At this time, the two substrates 13, 13 of the liquid crystal cell (A) 14 are
The rubbing direction of was set to be the parallel direction.
【００３１】（３）次に、液晶セル（Ａ）１４を８０℃
に保ちながら、強誘電性液晶「ＦＥＬＩＸ−Ｍ４６５４
／１００」（クラリアント製）（Ｆ−１）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（Ｆ−１）をネマティック相、
スメクティックＡ相を順に経由して強誘電相まで相転移
させた〔図２（ｃ）参照〕。なお、図２において、１５
は液晶セル（Ａ）１４のバルク領域を示している。(3) Next, the liquid crystal cell (A) 14 is heated to 80 ° C.
Ferroelectric liquid crystal "FELIX-M4654"
/ 100 ”(made by Clariant) (F-1) is injected in the isotropic liquid phase as it is, and then the temperature is gradually lowered to room temperature to make the ferroelectric liquid crystal (F-1) a nematic phase,
A phase transition was made through the smectic A phase to the ferroelectric phase in sequence (see FIG. 2 (c)). In addition, in FIG.
Indicates the bulk region of the liquid crystal cell (A) 14.
【００３２】その液晶セル（Ａ）１４のバルク領域１５
の拡大模式図を図３に示す。The bulk region 15 of the liquid crystal cell (A) 14
3 is an enlarged schematic diagram of FIG.
【００３３】図３から明らかなように、一対の基板１
３，１３の少なくとも一方の基板面付近、つまりバルク
領域１５内の表面領域１５Ａにおける液晶層の相転移温
度を変調させる。すなわち、ＳｍＡ−ＳｍＣ* 相転移点
を降下（変調）させた表面層を有するハイブリッド構造
の強誘電性液晶を得ることができる。As is apparent from FIG. 3, the pair of substrates 1
The phase transition temperature of the liquid crystal layer in the vicinity of at least one of the substrate surfaces 3 and 13, that is, the surface region 15A in the bulk region 15 is modulated. That is, it is possible to obtain a ferroelectric liquid crystal having a hybrid structure having a surface layer in which the SmA-SmC * phase transition point is lowered (modulated).
【００３４】したがって、バルクＦＬＣのティルト角が
増大しても、基板表面に近づくにつれティルト角が減少
し、Ｃ１−Ｃ２構造転移を抑制できる。Therefore, even if the tilt angle of the bulk FLC increases, the tilt angle decreases as it approaches the substrate surface, and the C1-C2 structural transition can be suppressed.
【００３５】そこで、この液晶セル（Ａ）１４の偏光顕
微鏡観察を行った。このとき、２枚の偏光板の透過軸は
直交させ、液晶セル（Ａ）１４のラビング方向と一方の
偏光板の透過軸との角度は１０度をなすように配置し、
温度は３０℃に設定した。この偏光顕微鏡観察の結果を
図４に示す。この図から、本発明の液晶表示素子はＣ１
構造のみの均一な配向を有することが分かる。Therefore, the liquid crystal cell (A) 14 was observed with a polarizing microscope. At this time, the transmission axes of the two polarizing plates are orthogonal to each other, and the rubbing direction of the liquid crystal cell (A) 14 and the transmission axis of one of the polarizing plates are arranged at an angle of 10 degrees.
The temperature was set to 30 ° C. The result of this polarization microscope observation is shown in FIG. From this figure, the liquid crystal display device of the present invention is C1.
It can be seen that the structure only has a uniform orientation.
【００３６】（実施例２）実施例１の液晶組成物（Ｌ−
１）を、室温においてネマティック相を呈する液晶組成
物「Ｃ２０５３」（ジャパンエナジー製）（Ｌ−２）に
変更した以外は同様にして液晶セル（Ｂ）を作製し、偏
光顕微鏡観察を行った。その偏光顕微鏡観察の結果を図
５に示す。この図からも、本発明の液晶表示素子はＣ１
構造のみの均一な配向を有することが分かる。Example 2 The liquid crystal composition (L-
A liquid crystal cell (B) was prepared in the same manner except that 1) was changed to a liquid crystal composition “C2053” (manufactured by Japan Energy) (L-2) that exhibits a nematic phase at room temperature, and was observed with a polarizing microscope. The result of the polarization microscope observation is shown in FIG. From this figure, the liquid crystal display element of the present invention is C1.
It can be seen that the structure only has a uniform orientation.
【００３７】（実施例３）実施例１の液晶組成物（Ｌ−
１）を、強誘電性液晶（Ｆ−１）７０重量部とアクリレ
ート系高分子「ＵＣＬ−００１」（大日本インキ化学
製）３０重量部からなる液晶組成物（Ｌ−３）に変更し
た以外は同様にして液晶セル（Ｃ）を作製し、偏光顕微
鏡観察を行った。液晶組成物（Ｌ−３）の相転移温度
は、強誘電性液晶（Ｆ−１）に比べて約５℃低い。偏光
顕微鏡観察の結果を図６に示す。この図からも、本発明
の液晶表示素子はＣ１構造のみの均一な配向を有するこ
とが分かる。Example 3 The liquid crystal composition (L-
1) was changed to a liquid crystal composition (L-3) comprising 70 parts by weight of a ferroelectric liquid crystal (F-1) and 30 parts by weight of an acrylate polymer "UCL-001" (manufactured by Dainippon Ink and Chemicals). In the same manner as above, a liquid crystal cell (C) was prepared and observed with a polarizing microscope. The phase transition temperature of the liquid crystal composition (L-3) is about 5 ° C. lower than that of the ferroelectric liquid crystal (F-1). The result of the polarization microscope observation is shown in FIG. From this figure, it can be seen that the liquid crystal display device of the present invention has a uniform orientation of only the C1 structure.
【００３８】（実施例４）実施例１の液晶組成物（Ｌ−
１）を、強誘電性液晶「ＦＥＬＩＸ−Ｍ４８５１／１０
０」（クラリアント製）（Ｆ−２）に変更した以外は同
様にして液晶セル（Ｄ）を作製し、偏光顕微鏡観察を行
った。強誘電性液晶（Ｆ−２）の相転移温度は、強誘電
性液晶（Ｆ−１）に比べて、スメクティックＡ相と強誘
電相の間及びネマティック相とスメクティックＡ相の間
の相転移温度において約６℃高い。すなわち、ＳｍＡ−
ＳｍＣ* 相転移点を変調させた表面層を有するハイブリ
ッド構造の強誘電性液晶を得ることができる。その偏光
顕微鏡観察の結果を図７に示す。この図からも、本発明
の液晶表示素子はＣ１構造のみの均一な配向を有するこ
とが分かる。Example 4 The liquid crystal composition (L-
1) is a ferroelectric liquid crystal "FELIX-M4851 / 10"
0 "(manufactured by Clariant) (F-2) except that the liquid crystal cell (D) was prepared in the same manner and observed by a polarizing microscope. The phase transition temperature of the ferroelectric liquid crystal (F-2) is higher than that of the ferroelectric liquid crystal (F-1) between the smectic A phase and the ferroelectric phase and between the nematic phase and the smectic A phase. At about 6 ° C higher. That is, SmA-
It is possible to obtain a ferroelectric liquid crystal having a hybrid structure having a surface layer in which the SmC * phase transition point is modulated. The result of the polarization microscope observation is shown in FIG. From this figure, it can be seen that the liquid crystal display device of the present invention has a uniform orientation of only the C1 structure.
【００３９】なお、本発明は上記実施例に限定されるも
のではなく、本発明の趣旨に基づいて種々の変形が可能
であり、これらを本発明の範囲から排除するものではな
い。The present invention is not limited to the above embodiments, and various modifications can be made based on the spirit of the present invention, and these modifications are not excluded from the scope of the present invention.
【００４０】[0040]
【発明の効果】以上、詳細に説明したように、本発明に
よれば、強誘電性液晶を用いた表示素子において、均一
な配向を有する強誘電性液晶表示素子を提供することが
できる。従って、本発明の液晶表示素子は、強誘電性液
晶の双安定性と高速応答性を利用した、大画面で高精細
な動画映像表示の可能な液晶表示素子を実現することが
でき、その有用的効果は著大である。As described above in detail, according to the present invention, it is possible to provide a ferroelectric liquid crystal display device having a uniform alignment in a display device using a ferroelectric liquid crystal. Therefore, the liquid crystal display element of the present invention can realize a liquid crystal display element capable of displaying a high-definition moving image on a large screen by utilizing the bistability and high-speed response of the ferroelectric liquid crystal, and its usefulness. Effect is enormous.
【図１】本発明にかかるＳｍＡ−ＳｍＣ相転移点を降下
（変調）させた表面層を有する強誘電性液晶表示素子の
模式図である。FIG. 1 is a schematic diagram of a ferroelectric liquid crystal display device having a surface layer in which a SmA-SmC phase transition point is lowered (modulated) according to the present invention.
【図２】本発明の実施例を示すＳｍＡ−ＳｍＣ相転移点
を降下させた表面層を有する強誘電性液晶表示素子の概
略製造工程断面図である。FIG. 2 is a schematic cross sectional view of a manufacturing process of a ferroelectric liquid crystal display device having a surface layer with a lowered SmA-SmC phase transition point, showing an example of the present invention.
【図３】図２における強誘電性液晶表示素子のバルク領
域の模式図である。FIG. 3 is a schematic diagram of a bulk region of the ferroelectric liquid crystal display element in FIG.
【図４】本発明の強誘電性液晶表示素子の製造方法によ
り得た実施例１における強誘電性液晶表示素子の偏光顕
微鏡写真（代用図面）である。FIG. 4 is a polarization microscope photograph (substitute drawing) of a ferroelectric liquid crystal display device in Example 1 obtained by the method for manufacturing a ferroelectric liquid crystal display device of the present invention.
【図５】本発明の強誘電性液晶表示素子の製造方法によ
り得た実施例２における強誘電性液晶表示素子の偏光顕
微鏡写真（代用図面）である。FIG. 5 is a polarization microscope photograph (substitute drawing) of a ferroelectric liquid crystal display device in Example 2 obtained by the method for manufacturing a ferroelectric liquid crystal display device of the present invention.
【図６】本発明の強誘電性液晶表示素子の製造方法によ
り得た実施例３における強誘電性液晶表示素子の偏光顕
微鏡写真（代用図面）である。FIG. 6 is a polarization microscope photograph (substitute drawing) of a ferroelectric liquid crystal display device in Example 3 obtained by the method for manufacturing a ferroelectric liquid crystal display device of the present invention.
【図７】本発明の強誘電性液晶表示素子の製造方法によ
り得た実施例４における強誘電性液晶表示素子の偏光顕
微鏡写真（代用図面）である。FIG. 7 is a polarization micrograph (substitute drawing) of a ferroelectric liquid crystal display element in Example 4 obtained by the method for manufacturing a ferroelectric liquid crystal display element of the present invention.
【図８】従来のＣ１及びＣ２シェブロンのＦＬＣ配向モ
デルの模式図である。FIG. 8 is a schematic diagram of a conventional C1 and C2 chevron FLC orientation model.
【図９】通常のＦＬＣセルの室温における偏光顕微鏡写
真（代用図面）である。FIG. 9 is a polarization micrograph (substitute drawing) of a normal FLC cell at room temperature.
１１ ポリイミド配向膜付きガラス基板（Ｓ−１）
１２ 液晶組成物（Ｌ−１）の薄膜
１３ 液晶組成物（Ｌ−１）の薄膜付きガラス基板
（Ｓ−２）
１４ 液晶セル（Ａ）
１５ 液晶セル（Ａ）のバルク領域
１５Ａ バルク領域内の表面領域11 Glass Substrate with Polyimide Alignment Film (S-1) 12 Thin Film of Liquid Crystal Composition (L-1) 13 Glass Substrate with Thin Film of Liquid Crystal Composition (L-1) (S-2) 14 Liquid Crystal Cell (A) 15 Liquid Crystal Bulk area 15A of cell (A) Surface area in bulk area
───────────────────────────────────────────────────── フロントページの続き (72)発明者 横山 浩 茨城県つくば市吾妻４−13−31 Ｆターム(参考） 2H088 GA02 GA04 GA08 HA03 MA18 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Hiroshi Yokoyama 4-13-31 Azuma, Tsukuba, Ibaraki F-term (reference) 2H088 GA02 GA04 GA08 HA03 MA18
Claims (5)
電性液晶表示素子において、前記一対の基板間の少なく
とも一方の基板面付近における前記液晶層の相転移温度
を変調させることを特徴とする強誘電性液晶表示素子。1. A ferroelectric liquid crystal display device in which a liquid crystal layer is sandwiched between a pair of substrates, wherein a phase transition temperature of the liquid crystal layer near at least one substrate surface between the pair of substrates is modulated. Ferroelectric liquid crystal display element.
おいて、前記液晶層が少なくとも強誘電性液晶を含有す
ることを特徴とする強誘電性液晶表示素子。2. The ferroelectric liquid crystal display element according to claim 1, wherein the liquid crystal layer contains at least a ferroelectric liquid crystal.
素子において、前記液晶層が、相転移温度の異なる少な
くとも２種類の液晶組成物から構成されることを特徴と
する強誘電性液晶表示素子。3. The ferroelectric liquid crystal display device according to claim 1, wherein the liquid crystal layer is composed of at least two kinds of liquid crystal compositions having different phase transition temperatures. Display element.
表示素子において、前記液晶層内において、前記基板面
付近とそれを除く領域の間で、少なくとも２種類の液晶
組成物の濃度勾配を生じさせることを特徴とする強誘電
性液晶表示素子。4. The ferroelectric liquid crystal display element according to claim 1, 2 or 3, wherein in the liquid crystal layer, a concentration of at least two kinds of liquid crystal compositions is provided between the vicinity of the substrate surface and a region excluding it. A ferroelectric liquid crystal display device characterized by producing a gradient.
電性液晶表示素子の製造方法において、（ａ）電極層及
び配向制御膜を有する透明性の第１の基板と、電極層及
び配向制御膜を有する第２の基板の、少なくとも一方の
基板面上に、第１の液晶組成物の薄膜を形成する第１の
工程と、（ｂ）前記第１の基板と第２の基板との間に、
第２の液晶組成物を介在させる第２の工程とを有するこ
とを特徴とする強誘電性液晶表示素子の製造方法。5. A method for manufacturing a ferroelectric liquid crystal display element, comprising a pair of substrates sandwiching a liquid crystal layer, comprising: (a) a transparent first substrate having an electrode layer and an orientation control film; and an electrode layer and an orientation. A first step of forming a thin film of a first liquid crystal composition on at least one substrate surface of a second substrate having a control film, and (b) the first substrate and the second substrate Between,
A second step of interposing a second liquid crystal composition, and a method for manufacturing a ferroelectric liquid crystal display element.
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|---|---|---|---|---|
| KR100958254B1 (en) | 2003-12-29 | 2010-05-17 | 엘지디스플레이 주식회사 | Liquid crystal display of in-plane-switching mode and method of fabricating the same |
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| KR100958254B1 (en) | 2003-12-29 | 2010-05-17 | 엘지디스플레이 주식회사 | Liquid crystal display of in-plane-switching mode and method of fabricating the same |
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