JPH0926577A - Forming method of oriented film for liquid crystal - Google Patents
Forming method of oriented film for liquid crystalInfo
- Publication number
- JPH0926577A JPH0926577A JP17482095A JP17482095A JPH0926577A JP H0926577 A JPH0926577 A JP H0926577A JP 17482095 A JP17482095 A JP 17482095A JP 17482095 A JP17482095 A JP 17482095A JP H0926577 A JPH0926577 A JP H0926577A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- organic compound
- substrate
- diamagnetic
- alignment film
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、液晶表示装置の液
晶パネルに用いられている液晶用配向膜の形成方法に関
する。特に、ネマティック液晶分子、反強誘電性液晶分
子や強誘電性液晶分子に代表されるスメクティック液晶
分子の配向に有用な液晶用配向膜の形成方法に関する。TECHNICAL FIELD The present invention relates to a method for forming an alignment film for liquid crystal used in a liquid crystal panel of a liquid crystal display device. In particular, the present invention relates to a method for forming an alignment film for liquid crystals useful for aligning smectic liquid crystal molecules represented by nematic liquid crystal molecules, antiferroelectric liquid crystal molecules and ferroelectric liquid crystal molecules.
【０００２】[0002]
【従来の技術】液晶表示装置は、情報機器におけるディ
スブレイなどマン・マシーン・インターフェースとして
は、是非必要となる技術である。特に、最近、コンピュ
ーター端末等において、小型化を達成するのに、液晶表
示装置の役割は極めて重要となってきている。また、オ
ーディオ・ヴィデオ装置において、映像表示装置におい
て、液晶表示装置が以前にもまして、重要になってき
た。2. Description of the Related Art A liquid crystal display device is an indispensable technology as a man-machine interface such as a display in information equipment. In particular, recently, the role of the liquid crystal display device has become extremely important in achieving miniaturization in computer terminals and the like. Further, in audio video devices, liquid crystal display devices have become more important than ever in video display devices.
【０００３】これらの液晶表示装置においては、液晶分
子の配向は、従来より最も一般的に採用されているの
が、ガラスや石英あるいは透明樹脂フィルムなどの上に
透明電極などを適宜形成した基板上に、ポリイミドなど
の樹脂膜を形成し、このポリイミドなどの樹脂膜をいわ
ゆるラビング処理し、かかるラビング処理された液晶用
配向膜に、液晶分子を接触させることにより配向膜近房
の液晶分子を配向させる方式が採用されている。In these liquid crystal display devices, the alignment of liquid crystal molecules has been most commonly adopted so far on a substrate in which a transparent electrode or the like is appropriately formed on glass, quartz or a transparent resin film. In addition, a resin film such as polyimide is formed, the resin film such as polyimide is subjected to so-called rubbing treatment, and the rubbing-treated alignment film for liquid crystal is brought into contact with liquid crystal molecules to align the liquid crystal molecules near the alignment film. The method of letting is adopted.
【０００４】この技術内容は、日本学術振興会情報科学
用有機材料第１４２委員会第５８回合同研究会資料（平
成５年１１月１１日〜１２日開催）などに詳細が掲載さ
れている。Details of this technical content are published in the materials of the 58th Joint Study Group of the 142nd Committee of Organic Materials for Information Science of Japan Society for the Promotion of Science (held from November 11 to 12, 1993).
【０００５】[0005]
【発明が解決しようとする課題】この、ラビング法、す
なわちポリイミドやポリアミドなどの配向膜用素材を多
数の高速運動をする繊維束（例えば、ラシャの毛足の長
めのものや鹿皮など）の摩擦により配向膜を延伸させる
手法においては、局部的に摩擦が強くなったり弱くなっ
たりすることによる、液晶分子の配向の不均一性が生起
しがちである。This rubbing method, that is, a method of using a material for an alignment film such as polyimide or polyamide in a large number of fiber bundles that move at a high speed (for example, long hair of Rasha or deer bark) In the method of stretching the alignment film by friction, nonuniformity of alignment of liquid crystal molecules tends to occur due to local increase or decrease in friction.
【０００６】また、繊維束を使用するため摩耗による前
記繊維束の微細な切断屑の発生、配向膜の削れ屑の発生
等、これが液晶パネルに混入し、歩留まりを低下させる
不都合が生じる。Further, since the fiber bundle is used, fine cutting scraps of the fiber bundle due to abrasion, scraps of the alignment film, and the like are mixed in the liquid crystal panel, which causes a problem of lowering the yield.
【０００７】本発明は上記の様な問題点がなく、液晶分
子の配向の均一性が優れ、微細な屑などの発生のない液
晶用配向膜の形成方法を提供することを目的とする。An object of the present invention is to provide a method for forming an alignment film for liquid crystal, which does not have the above-mentioned problems, is excellent in the uniformity of alignment of liquid crystal molecules, and does not generate fine dust.
【０００８】[0008]
【課題を解決するための手段】前記課題を解決するため
に、本発明の第１番目の発明の液晶用配向膜の形成方法
は、反磁性有機化合物を、平行磁場のもとで、基板上に
沈積させることを特徴とする。In order to solve the above-mentioned problems, a method for forming an alignment film for liquid crystals according to the first aspect of the present invention is a method of forming a diamagnetic organic compound on a substrate under a parallel magnetic field. It is characterized by being deposited on.
【０００９】本発明の第２番目の発明の液晶用配向膜の
形成方法は、光エネルギーで重合可能な反磁性有機化合
物からなるモノマーを、平行磁場のもとで、基板に沈積
させ、沈積と同時に光を照射して前記モノマーを重合さ
せて前記基板上に樹脂膜を形成することを特徴とする。A second method of forming an alignment film for liquid crystals of the present invention is to deposit a monomer composed of a diamagnetic organic compound capable of being polymerized by light energy on a substrate under a parallel magnetic field. At the same time, light is irradiated to polymerize the monomer to form a resin film on the substrate.
【００１０】前記第１または第２の液晶用配向膜の形成
方法の発明においては、反磁性有機化合物が、芳香族環
を含む反磁性有機化合物であることが好ましい。また、
前記第１の液晶用配向膜の形成方法の発明においては、
反磁性有機化合物が、ナフタレン、アンスラセン、フェ
ナントレン、ナフタセン、ｐ−テルフェニル、ｐ−クア
テルフェニル、およびこれらの誘導体からなる群から選
ばれた反磁性有機化合物であることが好ましい。In the invention of the first or second method for forming an alignment film for liquid crystals, the diamagnetic organic compound is preferably a diamagnetic organic compound containing an aromatic ring. Also,
In the invention of the first method for forming an alignment film for liquid crystals,
The diamagnetic organic compound is preferably a diamagnetic organic compound selected from the group consisting of naphthalene, anthracene, phenanthrene, naphthacene, p-terphenyl, p-quaterphenyl, and derivatives thereof.
【００１１】また、前記第２の液晶用配向膜の形成方法
の発明においては、反磁性有機化合物からなるモノマー
が、下記化学式で示されるブテン酸−ヘキシル−シアノ
ジベンジル−エーテルであることが好ましい。In the invention of the second method for forming an alignment film for liquid crystals, it is preferable that the monomer composed of a diamagnetic organic compound is butenoic acid-hexyl-cyanodibenzyl-ether represented by the following chemical formula. .
【００１２】[0012]
【化２】 Embedded image
【００１３】[0013]
【発明の実施の形態】通常、よく使われているネマティ
ック液晶や、反強誘電性液晶分子や強誘電性液晶分子に
代表されるスメクティック液晶分子の配向法としては、
ラビング法に代表される液晶分子の配向法がかなりの水
準にある。BEST MODE FOR CARRYING OUT THE INVENTION Generally, as a method for orienting nematic liquid crystal, smectic liquid crystal molecules represented by antiferroelectric liquid crystal molecules and ferroelectric liquid crystal molecules, which are commonly used,
The alignment method of liquid crystal molecules represented by the rubbing method is at a considerable level.
【００１４】しかし、このラビング法は、高速に動く繊
維束と摩擦さるべき基板との接触状態に微妙な制御を要
する。この制御は半ば、経験的になされているのが現状
である。この制御が理想的でないと、液晶表示におい
て、スジ等のムラを発生させる。ラビング法は上記の様
な機械的なマクロな方法であり、必然的にムラが発生し
やすい。However, this rubbing method requires delicate control of the contact state between the fiber bundle moving at high speed and the substrate to be rubbed. At present, this control is performed empirically in the middle. If this control is not ideal, unevenness such as streaks will occur in the liquid crystal display. The rubbing method is a mechanical macroscopic method as described above and inevitably causes unevenness.
【００１５】本発明による方法は、反磁性有機化合物
を、平行磁場のもとで、基板上に沈積させることによ
り、沈積する反磁性有機化合物が平行磁場で均一にその
分子の方向がそろえられて沈積されるので、磁場で非接
触状態で制御されて液晶用配向膜が形成されるため、ム
ラが無く原理的に均一な液晶分子の配向が可能となり、
液晶表示装置に組み込んだ場合に於いて表示の一様性も
確保される。In the method according to the present invention, a diamagnetic organic compound is deposited on a substrate under a parallel magnetic field, so that the deposited diamagnetic organic compound has its molecules uniformly aligned in the parallel magnetic field. Since it is deposited, the alignment film for liquid crystals is formed in a non-contact state controlled by a magnetic field, and in principle, uniform alignment of liquid crystal molecules is possible without unevenness,
When incorporated in a liquid crystal display device, display uniformity is also ensured.
【００１６】また、従来法では、配向膜の削り屑や、前
記繊維束の切断屑が発生し、これが液晶パネルに混入
し、液晶表示装置に適用した場合にその製造の歩留まり
を低下させる。Further, in the conventional method, shavings of the alignment film and shavings of the fiber bundle are generated, which are mixed in the liquid crystal panel and reduce the manufacturing yield when applied to the liquid crystal display device.
【００１７】本発明による方法は、従来の様なラビング
を必要としないので、磨耗や削れなどによって生じる屑
の発生が原理的に全く無く、この点からも液晶表示装置
に適用した場合にその製造の歩留まりの向上を促進し得
る。Since the method according to the present invention does not require rubbing as in the prior art, there is absolutely no generation of debris caused by abrasion or abrasion, and from this point as well, its production when applied to a liquid crystal display device. It can promote the improvement of the yield.
【００１８】尚、反磁性有機化合物として、光エネルギ
ーで重合可能な反磁性有機化合物からなるモノマーを用
いて平行磁場のもとで、基板に沈積させ、沈積と同時に
光を照射して前記モノマーを重合させて前記基板上に樹
脂膜を形成させた場合には、より機械的強度の大きい配
向膜を形成することができると言う点では好ましい。光
を照射して光エネルギーで重合を行うには、通常、高圧
水銀ランプを用いて紫外光を照射する方式が簡便であ
る。As the diamagnetic organic compound, a monomer made of a diamagnetic organic compound that can be polymerized by light energy is used to deposit it on a substrate under a parallel magnetic field, and at the same time as the deposition, the monomer is irradiated to irradiate the monomer. Polymerization to form a resin film on the substrate is preferable in that an alignment film having higher mechanical strength can be formed. In order to carry out polymerization by irradiating light with light energy, usually, a method of irradiating ultraviolet light using a high pressure mercury lamp is convenient.
【００１９】反磁性有機化合物とは、化合物分子そのま
までは磁気モーメントがなく、外部から印加される磁場
によって磁気モーメントを生じ、しかもその磁気モーメ
ントが磁場とは逆向きにできる有機化合物である。かか
る反磁性有機化合物としては、ベンゼン環やその縮合環
の様なナフタレンその他の芳香族縮合環など、芳香族環
を有する化合物が挙げられる。具体的には、ナフタレ
ン、アンスラセン、フェナントレン、ナフタセン、ｐ−
テルフェニル、ｐ−クアテルフェニル、およびこれらの
誘導体が好ましい。そして光エネルギーで重合可能な反
磁性有機化合物からなるモノマーとしては、かかる芳香
族環を有する化合物で且つ側鎖にラジカル重合性の不飽
和２重結合を有する有機化合物が用いられる。The diamagnetic organic compound is an organic compound which has no magnetic moment in the molecule of the compound as it is and produces a magnetic moment by a magnetic field applied from the outside, and the magnetic moment can be reversed from the magnetic field. Examples of such a diamagnetic organic compound include compounds having an aromatic ring such as naphthalene and other aromatic condensed rings such as a benzene ring and condensed rings thereof. Specifically, naphthalene, anthracene, phenanthrene, naphthacene, p-
Terphenyl, p-quaterphenyl, and their derivatives are preferred. As the monomer composed of a diamagnetic organic compound that can be polymerized by light energy, a compound having such an aromatic ring and an organic compound having a radically polymerizable unsaturated double bond in its side chain is used.
【００２０】配向膜が形成される基板としては、通常、
ガラスや石英などの透明基板の上に液晶表示装置様の液
晶パネルを形成するのに必要な透明電極が形成されたも
のが用いられる。透明電極としては通称ＩＴＯと称され
るインジウム錫酸化物が好ましく用いられる。The substrate on which the alignment film is formed is usually
A transparent substrate such as glass or quartz on which a transparent electrode necessary for forming a liquid crystal panel like a liquid crystal display device is formed is used. As the transparent electrode, indium tin oxide commonly referred to as ITO is preferably used.
【００２１】そしてこれらの基板上に、反磁性有機化合
物を、平行磁場のもとで沈積させる場合に用いられる装
置としては、特に限定するものではないが、例えば次の
様な装置を用いると簡便である。The device used for depositing the diamagnetic organic compound on these substrates under a parallel magnetic field is not particularly limited, but for example, the following device is convenient. Is.
【００２２】すなわち、石英ガラスなどから作成された
真空容器を用意し、前記基板を前記真空容器内の上の方
の位置に設置する。真空容器内の下部には反磁性有機化
合物を入れるための石英ガラス等からなる容器が設けら
れ、この容器に入れられた反磁性有機化合物の揮発を促
進するための非磁性体からなる加熱ヒーターが前記容器
の近傍に設けられている。また、反磁性有機化合物がそ
の容器から揮発して分子流となり、上方に設置された基
板に至る間の空間に平行磁場がかかるように前記真空容
器の外側には超伝導磁石が配置されている。光エネルギ
ーで反磁性有機化合物からなるモノマーの重合を行う必
要がある場合には、高圧水銀ランプが真空容器の外側で
基板面を照射できる様な位置に配置される。反磁性有機
化合物をその容器から揮発させて、上方に設置された基
板に沈積させるには、基板の角度は揮発した反磁性有機
化合物の分子流の方向に対して、すなわちほぼ垂直方向
に対して３０〜６０度程度傾けた角度で設置することが
基板に沈積される反磁性有機化合物の分子の向きを特定
方向に傾ける上で好ましい。真空容器内の圧力は、例え
ば１０-4〜１０-6Ｔｏｒｒ程度が好ましい。平行磁場に
かける磁場強度は大きければ大きいほど好ましく、特に
限定するものではないが通常、約２０テスラ以上が望ま
しい。尚、必要に応じて基板を加熱するための非磁性体
からなるヒーターを基板の後側に設置しておくことは、
反磁性有機化合物の分子流が基板方向に飛着するのを妨
げない様にするためにも好ましい。反磁性有機化合物を
揮発させるにはその容器を前述したヒーターによって加
熱するが、加熱温度は、反磁性有機化合物が揮発する温
度であればよく、化合物の種類や、装置の大きさ、真空
度、目的とする沈積スピードによって適宜設定すればよ
く、従って必ずしも当該化合物の沸点以上に加熱する必
要はない。反磁性有機化合物の基板への沈積厚みは特に
限定するものではないが０．０５〜１μｍ程度が好まし
い。That is, a vacuum container made of quartz glass or the like is prepared, and the substrate is placed at the upper position in the vacuum container. A container made of quartz glass or the like for containing a diamagnetic organic compound is provided in the lower part of the vacuum container, and a heater made of a nonmagnetic material for promoting volatilization of the diamagnetic organic compound contained in the container is provided. It is provided near the container. Further, a superconducting magnet is arranged outside the vacuum container so that the diamagnetic organic compound is volatilized from the container into a molecular flow and a parallel magnetic field is applied to a space extending to the substrate installed above. . When it is necessary to polymerize the diamagnetic organic compound monomer with light energy, a high-pressure mercury lamp is arranged at a position outside the vacuum container so that the substrate surface can be irradiated. In order to evaporate the diamagnetic organic compound from the container and deposit it on the substrate placed above, the angle of the substrate should be relative to the direction of the molecular flow of the volatilized diamagnetic organic compound, that is, about the vertical direction. It is preferable to install at an angle of about 30 to 60 degrees in order to tilt the molecules of the diamagnetic organic compound deposited on the substrate in a specific direction. The pressure in the vacuum container is preferably about 10 −4 to 10 −6 Torr, for example. The larger the magnetic field strength applied to the parallel magnetic field is, the more preferable it is. In addition, if a heater made of a non-magnetic material for heating the substrate is installed on the rear side of the substrate as necessary,
It is also preferable in order not to prevent the molecular flow of the diamagnetic organic compound from flying toward the substrate. In order to volatilize the diamagnetic organic compound, the container is heated by the above-mentioned heater, but the heating temperature may be any temperature at which the diamagnetic organic compound volatilizes, the type of compound, the size of the apparatus, the degree of vacuum, It may be appropriately set according to the target deposition speed, and therefore it is not always necessary to heat the compound to the boiling point or higher. The thickness of the diamagnetic organic compound deposited on the substrate is not particularly limited, but is preferably about 0.05 to 1 μm.
【００２３】[0023]
【実施例】以下、本発明の実施例を説明する。 （実施例１）基板として、ソーダライムガラス基板の主
面がＳｉＯ2 でアンダーコートされ、その上に微細加工
された透明電極（ＩＴＯ電極）が設けられ、更にその上
にＳｉＯ2 のオーバーコート層を有する基板を用いた。Embodiments of the present invention will be described below. (Example 1) As a substrate, a major surface of a soda lime glass substrate was undercoated with SiO 2 , a finely processed transparent electrode (ITO electrode) was provided thereon, and an SiO 2 overcoat layer was further provided thereon. Was used.
【００２４】反磁性有機化合物として、アンスラセンと
この誘導体ベンゾキノリン、さらにｐ−クアテルフェニ
ルを使用した。これらの物質は、芳香族環を分子にふく
んでおり、従って芳香族環に起因する電子雲の故に、反
磁性的振舞いを示す有機化合物である。As the diamagnetic organic compound, anthracene, its derivative benzoquinoline, and p-quaterphenyl were used. These substances are organic compounds that include an aromatic ring in the molecule and therefore exhibit diamagnetic behavior because of the electron cloud caused by the aromatic ring.
【００２５】これらの反磁性有機化合物を、平行磁場の
もとで、基板上に沈積する装置として、図１のような装
置を使用した。図１は本発明の液晶用配向膜の形成方法
に使用する装置の概略構成断面図である。図１におい
て、１は主に石英ガラスからなる真空容器、２はガラス
基板、３は非磁性であるタンタルで構成されたヒータ
ー、４は液体窒素を冷却剤とした超伝導電磁石、５は反
磁性有機化合物、６は石英ガラスからなり反磁性有機化
合物を入れて揮発させるのに用いる容器、７は反磁性有
機化合物を加熱するためのタンタルからなる加熱ヒータ
ーである。An apparatus as shown in FIG. 1 was used as an apparatus for depositing these diamagnetic organic compounds on a substrate under a parallel magnetic field. FIG. 1 is a schematic sectional view of an apparatus used in the method for forming an alignment film for liquid crystal of the present invention. In FIG. 1, 1 is a vacuum vessel mainly made of quartz glass, 2 is a glass substrate, 3 is a heater made of non-magnetic tantalum, 4 is a superconducting electromagnet using liquid nitrogen as a coolant, and 5 is diamagnetic. An organic compound, 6 is a container made of quartz glass and used to volatilize a diamagnetic organic compound, and 7 is a heating heater made of tantalum for heating the diamagnetic organic compound.
【００２６】以上に示した装置を用い、前記ソーダライ
ムガラス基板２の設定の角度を揮発してくる反磁性有機
化合物の分子流（垂直線方向）に対して、約５０度の角
度になる様に設定した。この基板の角度により、分子流
の基板に対する方向を基板に対して規定することができ
る。ヒーター３により、基板２の温度は約４０℃に保っ
た。Using the apparatus described above, the angle of the soda-lime glass substrate 2 is set to an angle of about 50 ° with respect to the molecular flow (perpendicular direction) of the diamagnetic organic compound that volatilizes. Set to. The angle of the substrate allows the direction of the molecular flow with respect to the substrate to be defined with respect to the substrate. The temperature of the substrate 2 was kept at about 40 ° C. by the heater 3.
【００２７】超伝導磁石４により、真空容器１内の磁場
は約２５テスラの平行磁場となるように設定した。ま
た、真空容器１内の真空容器内の圧力はほぼ１０-6Ｔｏ
ｒｒにした。The magnetic field in the vacuum chamber 1 was set by the superconducting magnet 4 to be a parallel magnetic field of about 25 tesla. The pressure in the vacuum container 1 is about 10 −6 To.
rr.
【００２８】反磁性有機化合物５の温度は、反磁性有機
化合物５がアンスラセンの場合には約３００℃に、反磁
性有機化合物５がベンゾキノリンの場合には約１８０℃
に、反磁性有機化合物がｐ−クアテルフェニルの場合に
は約３７０℃に制御し、前記それぞれの反磁性有機化合
物基の種類ごとにそれぞれの基板の板面にそれぞれの反
磁性有機化合物を厚み約０．２μｍ沈積させることによ
り液晶用配向膜を基板の上に形成した。The temperature of the diamagnetic organic compound 5 is about 300 ° C. when the diamagnetic organic compound 5 is anthracene, and about 180 ° C. when the diamagnetic organic compound 5 is benzoquinoline.
When the diamagnetic organic compound is p-quaterphenyl, the temperature is controlled to about 370 ° C., and the thickness of each diamagnetic organic compound is adjusted on the plate surface of each substrate for each kind of the diamagnetic organic compound group. An alignment film for liquid crystal was formed on the substrate by depositing about 0.2 μm.
【００２９】こうして得られた反磁性有機化合物が沈積
された基板を、同じ種類の反磁性有機化合物毎に、その
一対の基板の主面を対向させ、しかも規定された分子流
の方向が平行となるように対向させ、スペーサーを配し
て約１．５μｍの間隙を保ってシール材を用いて貼り合
わせ、空セルを作製した。The substrates on which the diamagnetic organic compounds thus obtained are deposited, the main surfaces of a pair of the substrates are made to face each other for each diamagnetic organic compound of the same kind, and the prescribed molecular flow directions are parallel. So as to face each other, a spacer was arranged, and a gap was maintained with a gap of about 1.5 μm to bond them using a sealing material to fabricate an empty cell.
【００３０】次にこの空セルに充填する液晶組成物とし
て反強誘電性液晶組成物（窒素石油化学株式会社製 タ
イプ“ＣＳ−４０００”）を用意した。この反強誘電性
液晶組成物の等方的液体相を示す温度は約８９℃であっ
た。Next, an antiferroelectric liquid crystal composition (Type "CS-4000" manufactured by Nitrogen Petrochemical Co., Ltd.) was prepared as a liquid crystal composition to be filled in the empty cell. The temperature at which the antiferroelectric liquid crystal composition exhibits an isotropic liquid phase was about 89 ° C.
【００３１】この空セルおよび反強誘電性液晶組成物を
約９５℃に加温した。そして空セルの間隙に、反強誘電
性液晶組成物を充填して液晶セルを得た。液晶セルを常
温まで冷却した。The empty cell and the antiferroelectric liquid crystal composition were heated to about 95.degree. Then, the gap between the empty cells was filled with an antiferroelectric liquid crystal composition to obtain a liquid crystal cell. The liquid crystal cell was cooled to room temperature.
【００３２】かくして得られた液晶セルの液晶の配向状
態を観察したところ、非常に均一であった。偏光板を液
晶セルの両側に設け、光学特性を評価したところ、コン
トラスト（比）は約４０が得られた。これは、本発明の
反磁性有機化合物の液晶用配向膜に代えて、通常のポリ
イミド配向膜を用いて他の条件は同等にして作製した従
来の液晶セルの約２倍の値である。また、ゴミ等の発生
も少なく、従って液晶セルの不良品の発生も少なかっ
た。The alignment state of the liquid crystal of the liquid crystal cell thus obtained was observed and found to be very uniform. When polarizing plates were provided on both sides of the liquid crystal cell and the optical characteristics were evaluated, a contrast (ratio) of about 40 was obtained. This is about twice the value of a conventional liquid crystal cell produced by using a normal polyimide alignment film in place of the diamagnetic organic compound alignment film for liquid crystals of the present invention under the same other conditions. Further, the amount of dust and the like was small, and accordingly, the number of defective liquid crystal cells was small.
【００３３】（実施例２）基板として、ソーダライムガ
ラス基板の主面がＳｉＯ2 でアンダーコートされ、その
上に微細加工された透明電極（ＩＴＯ電極）が設けら
れ、更にその上にＳｉＯ2 のオーバーコート層を有する
基板を用いた。(Example 2) As a substrate, the main surface of a soda lime glass substrate was undercoated with SiO 2 , and a finely processed transparent electrode (ITO electrode) was provided thereon, and further, a SiO 2 layer was formed on the transparent electrode. A substrate having an overcoat layer was used.
【００３４】反磁性有機化合物からなるモノマーとし
て、（化２）に示したブテン酸−ヘキシル−シアノジベ
ンジル−エーテル化合物を使用した。この物質は、ベン
ゼン環を分子にふくんでおり、従ってベンゼン環に起因
する電子雲の故に、反磁性的振舞いを示す反磁性有機化
合物である。As the monomer composed of the diamagnetic organic compound, the butenoic acid-hexyl-cyanodibenzyl-ether compound shown in Chemical formula 2 was used. This substance is a diamagnetic organic compound that contains a benzene ring in the molecule and therefore exhibits diamagnetic behavior due to the electron cloud caused by the benzene ring.
【００３５】この反磁性有機化合物からなるモノマー
を、平行磁場のもとで、基板上に沈積する装置として、
前記図１に示したような装置を使用した。ただし、反磁
性有機化合物からなるモノマーの分子流の基板の析出面
に対して、真空容器１の外部から紫外線を照射するため
の高圧水銀ランプ（図示せず）を真空容器１の外部に設
置した。また、前記ソーダライムガラス基板２の設定の
角度は揮発してくる反磁性有機化合物からなるモノマー
の分子流（垂直線方向）に対して、約５０度の角度にな
る様に設定した。As a device for depositing the diamagnetic organic compound monomer on a substrate under a parallel magnetic field,
The apparatus shown in FIG. 1 was used. However, a high-pressure mercury lamp (not shown) for irradiating ultraviolet rays from the outside of the vacuum container 1 was installed outside the vacuum container 1 on the deposition surface of the substrate of the molecular flow of the diamagnetic organic compound monomer. . Further, the setting angle of the soda lime glass substrate 2 was set to be about 50 degrees with respect to the molecular flow (perpendicular direction) of the volatile monomer composed of the diamagnetic organic compound.
【００３６】超伝導磁石４により、真空容器１内の磁場
は約２０テスラの平行磁場となるように設定し、真空容
器１内の真空容器内の圧力はほぼ１０-6Ｔｏｒｒにし
た。石英ガラスからなる容器６を加熱ヒーター７で加熱
して反磁性有機化合物からなるモノマー（化２）の温度
を、約３７０℃に保った。かつ、基板２へのモノマーの
析出時には、基板面に前記高圧水銀ランプにより紫外線
を照射し、モノマーを光エネルギーにより重合して樹脂
膜とした。The magnetic field in the vacuum vessel 1 was set by the superconducting magnet 4 to be a parallel magnetic field of about 20 tesla, and the pressure in the vacuum vessel in the vacuum vessel 1 was set to about 10 -6 Torr. The container 6 made of quartz glass was heated by the heater 7 to keep the temperature of the monomer (Chemical Formula 2) made of the diamagnetic organic compound at about 370 ° C. Further, when the monomer was deposited on the substrate 2, the substrate surface was irradiated with ultraviolet rays from the high-pressure mercury lamp to polymerize the monomer with light energy to form a resin film.
【００３７】こうして得られた液晶用配向膜が形成され
た基板を用いて、実施例１と同様の方法で液晶セルを形
成した。ただし、一対の基板の互いの角度は、配向膜の
配向方向が２４０度ずれて向き合う様に、且つ、約６μ
ｍの間隙を保って貼りあわせた。A liquid crystal cell was formed in the same manner as in Example 1 using the substrate thus obtained on which the alignment film for liquid crystal was formed. However, the angle between the pair of substrates is about 6 μm such that the alignment directions of the alignment films are shifted by 240 degrees.
It was pasted with a space of m.
【００３８】液晶組成物としては、スーパーツイスティ
ッドネマティック液晶組成物（メルク社製 タイプ“Ｚ
ＬＩ−２２９３”）を用いた。かくして得られた液晶セ
ルの液晶の配向状態を観察したところ、非常に均一であ
った。偏光板を液晶セルの両側に設け、光学特性を評価
したところ、コントラストは従来のポリイミド配向膜を
使用して同様に作製した液晶セルに比べて約１．５倍に
向上した。また、ゴミ等の発生も少なく、従って液晶セ
ルの不良品の発生も少なかった。As the liquid crystal composition, a super twisted nematic liquid crystal composition (Type "Z manufactured by Merck & Co., Inc.
LI-2293 ″) was used. The alignment state of the liquid crystal in the liquid crystal cell thus obtained was observed to be very uniform. Polarizing plates were provided on both sides of the liquid crystal cell, and optical characteristics were evaluated. Was about 1.5 times as high as that of a liquid crystal cell similarly prepared by using a conventional polyimide alignment film, and the generation of dust and the like was small, and accordingly, the number of defective liquid crystal cells was small.
【００３９】[0039]
【発明の効果】以上本発明は、液晶分子の配向の均一性
が優れ、微細な屑などの発生のない液晶用配向膜の形成
方法を提供し得る。したがって本発明方法で形成された
液晶配向膜を有する基板を用いて作製された液晶表示装
置の製造歩留まりは従来のラビング法の配向膜を用いた
ものに比べて優れており、また、液晶表示装置の表示品
位の向上を実現するに有力な液晶用配向膜の形成方法を
提供し得る。INDUSTRIAL APPLICABILITY As described above, the present invention can provide a method for forming an alignment film for liquid crystal, which has excellent uniformity of alignment of liquid crystal molecules and does not generate fine dust. Therefore, the manufacturing yield of the liquid crystal display device manufactured by using the substrate having the liquid crystal alignment film formed by the method of the present invention is superior to that using the alignment film of the conventional rubbing method. It is possible to provide a method for forming an alignment film for liquid crystal, which is effective in realizing the improvement of the display quality.
【００４０】尚、反磁性有機化合物として、光エネルギ
ーで重合可能な反磁性有機化合物からなるモノマーを用
いて平行磁場のもとで、基板に沈積させ、沈積と同時に
光を照射して前記モノマーを重合させて前記基板上に樹
脂膜を形成させた場合には、より機械的強度の大きい配
向膜を形成することができる。As a diamagnetic organic compound, a monomer made of a diamagnetic organic compound which can be polymerized by light energy is used to deposit the monomer on a substrate under a parallel magnetic field, and the monomer is irradiated with light at the same time as the deposition. When the resin film is formed on the substrate by polymerization, an alignment film having higher mechanical strength can be formed.
【図１】本発明の一実施例の液晶用配向膜の形成方法に
使用する装置の概略構成断面図である。FIG. 1 is a schematic cross-sectional view of an apparatus used in a method for forming an alignment film for liquid crystal according to an embodiment of the present invention.
１ 真空容器 ２ ガラス基板 ３ 加熱ヒーター ４ 超伝導電磁石 ５ 反磁性有機化合物 ６ 石英ガラスからなる容器 ７ 加熱ヒーター 1 Vacuum Container 2 Glass Substrate 3 Heater 4 Superconducting Electromagnet 5 Diamagnetic Organic Compound 6 Container Made of Quartz Glass 7 Heater
Claims (5)
で、基板上に沈積させることを特徴とする液晶用配向膜
の形成方法。1. A method for forming an alignment film for a liquid crystal, which comprises depositing a diamagnetic organic compound on a substrate under a parallel magnetic field.
合物からなるモノマーを、平行磁場のもとで、基板に沈
積させ、沈積と同時に光を照射して前記モノマーを重合
させて前記基板上に樹脂膜を形成することを特徴とする
液晶用配向膜の形成方法。2. A monomer composed of a diamagnetic organic compound that is polymerizable by light energy is deposited on a substrate under a parallel magnetic field, and at the same time as the deposition, light is irradiated to polymerize the monomer so that the monomer is polymerized on the substrate. A method for forming an alignment film for a liquid crystal, which comprises forming a resin film.
磁性有機化合物である請求項１または２のいずれかに記
載の液晶用配向膜の形成方法。3. The method for forming an alignment film for a liquid crystal according to claim 1, wherein the diamagnetic organic compound is a diamagnetic organic compound containing an aromatic ring.
スラセン、フェナントレン、ナフタセン、ｐ−テルフェ
ニル、ｐ−クアテルフェニル、およびこれらの誘導体か
らなる群から選ばれた反磁性有機化合物である請求項１
に記載の液晶用配向膜の形成方法。4. The diamagnetic organic compound is a diamagnetic organic compound selected from the group consisting of naphthalene, anthracene, phenanthrene, naphthacene, p-terphenyl, p-quaterphenyl, and derivatives thereof.
The method for forming an alignment film for a liquid crystal according to.
下記化学式で示されるブテン酸−ヘキシル−シアノジベ
ンジル−エーテルである請求項２に記載の液晶用配向膜
の形成方法。 【化１】 5. A monomer comprising a diamagnetic organic compound,
The method for forming an alignment film for a liquid crystal according to claim 2, which is butenoic acid-hexyl-cyanodibenzyl-ether represented by the following chemical formula. Embedded image
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17482095A JP3027523B2 (en) | 1995-07-11 | 1995-07-11 | Method of forming alignment film for liquid crystal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17482095A JP3027523B2 (en) | 1995-07-11 | 1995-07-11 | Method of forming alignment film for liquid crystal |
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| Publication Number | Publication Date |
|---|---|
| JPH0926577A true JPH0926577A (en) | 1997-01-28 |
| JP3027523B2 JP3027523B2 (en) | 2000-04-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004255600A (en) * | 2003-02-24 | 2004-09-16 | National Institute For Materials Science | Method and apparatus for manufacturing anisotropic molding |
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1995
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004255600A (en) * | 2003-02-24 | 2004-09-16 | National Institute For Materials Science | Method and apparatus for manufacturing anisotropic molding |
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| Publication number | Publication date |
|---|---|
| JP3027523B2 (en) | 2000-04-04 |
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