JPS58172621A - Liquid crystal display element - Google Patents

Abstract

PURPOSE:To prevent the upper and under electrodes of a liq. crystal display element having org. oriented films from touching with each other by forming an inorg. film on at least one of the electrodes. CONSTITUTION:An upper electrode 2 and an org. film 3 to be oriented are formed on an upper substrate 1, and the film 3 is oriented. An under electrode 5 is formed on an under substrate 4, an inorg. film 6 of SiO2 or the like having 200-2,000Angstrom thickness is formed on the electrode 5, and an org. film 7 to be oriented is further formed on the film 6 and oriented. The peripheries of the substrates are sealed with a sealant (not shown), and a liq. crystal 8 is injected into the inside. The inorg. film 6 is much superior to the org. films in insulating property and is hardly scratched, so the electrodes 2, 5 are prevented from touching with each other even if foreign matter sticks to the electrodes 2, 5. When the thickness of the film 6 is <200Angstrom , defects such as pinholes are produced, and the film does not act as an insulating film. When the thickness is >2,000Angstrom , it becomes difficult to apply an electric field to the liq. crystal layer owing to voltage drop.

Description

【発明の詳細な説明】 本発明は有機配向膜を施した液晶表示素子の改良に関す
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in liquid crystal display elements provided with organic alignment films.

従来の有機配向膜を施した液晶表示素子は、上板基板お
よび下板基板上にそれぞれ４Ｆ板電極、上板電極が形成
され、その上にそれぞれ有機配向膜が形成されている。In a conventional liquid crystal display element provided with an organic alignment film, a 4F plate electrode and an upper plate electrode are formed on an upper substrate and a lower substrate, respectively, and an organic alignment film is formed on each of them.

そして、有機配向膜をある方向に一様にラビングなどに
より配向処理し、上下板基板間に液晶を封入し配向させ
てなる。Then, the organic alignment film is uniformly aligned in a certain direction by rubbing or the like, and liquid crystal is sealed and aligned between the upper and lower substrates.

ところで、液晶表示素子は低温中に放置すると、液晶体
積が減少し、この減少分だけ上下板基板が変形し、上下
板基板間のギャップが狭くなる。前記上下板基板間のギ
ャップは、通常の状態で６〜ｌＯμｍであるが、−３０
℃程度の低温時には３〜７μｍ程度となる。一方、前記
上下板電極は真空蒸着法などにより真空中で形成される
が、異物なども同時に付着し、その部分の電極高さが２
〜５μｍ＃どなる場合がある。また有機配向膜は傷が付
き易い性質を有する。このため、低温時に上下板電極が
タッチし、不良となるという欠点があった。By the way, when a liquid crystal display element is left in a low temperature, the liquid crystal volume decreases, the upper and lower substrates deform by the amount of this decrease, and the gap between the upper and lower substrates narrows. The gap between the upper and lower substrates is 6 to 10 μm under normal conditions, but it is −30 μm.
At a low temperature of about 0.degree. C., the thickness is about 3 to 7 .mu.m. On the other hand, the upper and lower plate electrodes are formed in a vacuum using a vacuum evaporation method, etc., but foreign matter etc. also adhere to them, and the height of the electrodes at that part becomes 2.
~5μm # may cause a roar. Furthermore, the organic alignment film has the property of being easily scratched. For this reason, there was a drawback that the upper and lower plate electrodes touched each other at low temperatures, resulting in defects.

本発明の目的は上下板電極のタッチを防止することがで
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 provide a liquid crystal display element that can prevent upper and lower electrodes from being touched.

以下、本発明の一実施例を図示の実施例により説明する
。上板基ｒｉｌ上には上板電極２が形成され、その上に
有機配向＠３が形成され、この有機配向膜３に配向処理
が施されている。上板基板４上には下板電極５が形成さ
れ、その上に厚さ２００〜ｚ、ｏｏｏＡの８１０．など
の無機膜６が形成され、さらにその上に有機配向膜７が
形成され、この有機配向［７に配向処理が施されている
。そして、上下板基板１．４を一定のギャップを保つよ
うに周囲をシール材（図示せず）でシールし、内部に液
晶８を封入してなる。EMBODIMENT OF THE INVENTION Hereinafter, one embodiment of the present invention will be described with reference to the illustrated embodiment. An upper electrode 2 is formed on the upper substrate ril, an organic alignment film 3 is formed thereon, and an alignment treatment is performed on this organic alignment film 3. A lower plate electrode 5 is formed on the upper plate substrate 4, and an 810. An inorganic film 6 such as the above is formed, and an organic alignment film 7 is further formed thereon, and an alignment treatment is applied to this organic alignment [7]. The periphery of the upper and lower substrates 1.4 is sealed with a sealing material (not shown) to maintain a constant gap, and the liquid crystal 8 is sealed inside.

このように下板電極５上に無機膜６を形成してなり、無
機膜６は有機膜に比較して絶縁性が格段に優れ、また傷
が付きにくいので、異物が電極２．５に付着していても
上下電極２．５がタッチすることは防止される。また無
機膜６Ｆに有機配向膜７を設けることにより、従来と同
様１こ配向性を持たせることができる。In this way, the inorganic film 6 is formed on the lower plate electrode 5, and since the inorganic film 6 has much better insulating properties than an organic film and is less likely to be scratched, foreign matter will not adhere to the electrode 2.5. Even if the upper and lower electrodes 2.5 are touched, the upper and lower electrodes 2.5 are prevented from touching. Further, by providing the organic alignment film 7 on the inorganic film 6F, it is possible to provide a single orientation as in the conventional case.

ここで、無機Ｊ［６が薄いと、ピンホールナトの欠陥が
できて絶縁膜としての働きがなくなるので、厚さの下限
は２００Ａが好ましい。また無機膜６の厚さ１，０ＯＯ
Ａで０．１ｖの電圧降下が生じ、厚さが厚くなると電圧
降下壷こ：よって液晶層Ｃと電界がかかりにくくなるの
で、厚さの上限は２，０００＾が好ましい。また無機膜
６の形成方法は、例えば８ｉ０２をスピンオングラス（
ＳＯＧ）方法で、またはＳｉＯを蒸着法などで容易に形
成することができる。Here, if the inorganic J[6 is thin, pinhole defects will occur and it will no longer function as an insulating film, so the lower limit of the thickness is preferably 200A. In addition, the thickness of the inorganic film 6 is 1,000 mm.
A voltage drop of 0.1 V occurs at A, and as the thickness increases, it becomes difficult to apply an electric field to the liquid crystal layer C, so the upper limit of the thickness is preferably 2,000^. Further, the method for forming the inorganic film 6 is, for example, using 8i02 as a spin-on glass (
It can be easily formed by the SOG (SOG) method or by a SiO vapor deposition method.

なお、上記実施例においては、下板基１ｆ４側に無機膜
６を設けたが、上板基板ｌ側に設けても、または上下板
基［１，４側の両方に設けてもよい。In the above embodiment, the inorganic film 6 was provided on the lower substrate 1f4 side, but it may be provided on the upper substrate l side or on both the upper and lower substrates [1 and 4 sides.

以上の説明から明らかな如く、本発明によれば、上下板
電極の少なくとも一方の電極上に無機膜を形成してなる
ので、上下板電極のタッチ不良は防止される。As is clear from the above description, according to the present invention, since an inorganic film is formed on at least one of the upper and lower plate electrodes, touch failures between the upper and lower plate electrodes can be prevented.

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

図は本発明条こなる液晶表示素子の一実施例を示す１Ｎ
部断面図である。 １・・・上板基板、　　　　　２・・・上板電極、３・
・・有機配向膜、　　　４・・・下板基板、５・・・下
板電極、　　　　　６・・・無機膜、７・・・有機配向
膜。 代理人　弁理士　薄　１）利　幸１、 ；ｌ’　−１；−’４The figure shows an example of a liquid crystal display element according to the present invention.
FIG. 1... Upper plate substrate, 2... Upper plate electrode, 3...
...Organic alignment film, 4...Lower substrate, 5...Lower electrode, 6...Inorganic film, 7...Organic alignment film. Agent Patent Attorney Susuki 1) Toshiyuki1, ;l'-1;-'4

Claims (1)

【特許請求の範囲】 】　有機配向膜を施した液晶表示素子において、−Ｆ上
板基板上にそれぞれ形成した上下板電極の少なくとも一
方の電極上に無機膜を形成し、さらにその上に有機配向
膜を形成し、配向処理をしてなる液晶表示素子。 ２、無機膜は２００〜２，０００にの厚さよりなる特許
請求の範囲１１１項記載の液晶表示素子。 ３、無機膜は８１０．よりなる特許請求の範囲第１項記
載の液晶表示素子。[Claims] ] In a liquid crystal display element provided with an organic alignment film, an inorganic film is formed on at least one of the upper and lower plate electrodes respectively formed on the -F upper plate substrate, and an organic alignment film is further formed on the inorganic film. A liquid crystal display element formed by forming a film and undergoing alignment treatment. 2. The liquid crystal display element according to claim 111, wherein the inorganic film has a thickness of 200 to 2,000 mm. 3. Inorganic membrane is 810. A liquid crystal display element according to claim 1, comprising: