JPH026924A - Liquid crystal panel - Google Patents
Liquid crystal panelInfo
- Publication number
- JPH026924A JPH026924A JP15766988A JP15766988A JPH026924A JP H026924 A JPH026924 A JP H026924A JP 15766988 A JP15766988 A JP 15766988A JP 15766988 A JP15766988 A JP 15766988A JP H026924 A JPH026924 A JP H026924A
- Authority
- JP
- Japan
- Prior art keywords
- liquid crystal
- mesh material
- transparent resin
- electrodes
- crystal panel
- 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
- 239000004973 liquid crystal related substance Substances 0.000 title claims abstract description 97
- 239000000463 material Substances 0.000 claims abstract description 33
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 239000011347 resin Substances 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 230000004927 fusion Effects 0.000 abstract 1
- 230000005684 electric field Effects 0.000 description 7
- 238000007789 sealing Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000004988 Nematic liquid crystal Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- NZNMSOFKMUBTKW-UHFFFAOYSA-N Cyclohexanecarboxylic acid Natural products OC(=O)C1CCCCC1 NZNMSOFKMUBTKW-UHFFFAOYSA-N 0.000 description 1
- 241000270708 Testudinidae Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- IGARGHRYKHJQSM-UHFFFAOYSA-N cyclohexylbenzene Chemical compound C1CCCCC1C1=CC=CC=C1 IGARGHRYKHJQSM-UHFFFAOYSA-N 0.000 description 1
- -1 cyclohexylcarboxylic acid ester Chemical class 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012769 display material Substances 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012943 hotmelt Substances 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000003094 microcapsule Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920006254 polymer film Polymers 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000012780 transparent material Substances 0.000 description 1
Landscapes
- Liquid Crystal (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明は、液晶を用いたパネルに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a panel using liquid crystal.
液晶は、表示素子用材料などして広く利用されている。 Liquid crystals are widely used as materials for display elements.
これは、液晶の持つ光学的性質を容易にコントロールで
きること、つまり、電界を印加するとその分子が電界の
方向に配向し、また、電界を解除すると配向していた分
子がランダムな状態となるという性質に起因している。This is because the optical properties of liquid crystals can be easily controlled; in other words, when an electric field is applied, the molecules align in the direction of the electric field, and when the electric field is removed, the oriented molecules become random. This is due to
従来、液晶を用いたパネルは、小型であったが、大型の
ものも提案されている。この液晶パネルの１例が、第３
図ｆａｎ、 （ｂ）に示される。図中、ｎｅは液晶２２
の異常光線に対する屈折率、ｎｏは液晶２２の常光線に
対する屈折率、ｎｓは透明樹脂６の屈折率である。この
液晶パネルは、液晶２２・・・を透明樹脂６中へ分散し
てなるフィルム（またはシート）を１対の電極４．４が
挟んでなっている。１対の電極４．４間には電源７が接
続されていて、スイッチ８のオン、オフにより、電圧の
印加およびその解除がそれぞれなされる。第３図（ａ）
にみるように、電圧を印加しない状！３（電界を印加し
ない状態）では、液晶２２・・・が乱雑に配向している
ため、光が散乱される。第３図（ｂ）にみるように、１
対の電極４．４間に電圧を印加すると、正の誘電率異方
性を有するネマチック液晶では、分子が電界方向に配向
する。このため、電界方向と平行な方向の屈折率がｎｅ
となり、このｎｅの値が透明樹脂６の屈折率ｎｓと近い
と、液晶パネルの透明性は著しく増加することになる。Conventionally, panels using liquid crystals have been small, but large panels have also been proposed. An example of this liquid crystal panel is
Shown in Figure fan, (b). In the figure, ne is the liquid crystal 22
is the refractive index for extraordinary rays, no is the refractive index of the liquid crystal 22 for ordinary rays, and ns is the refractive index of the transparent resin 6. This liquid crystal panel consists of a film (or sheet) in which liquid crystals 22 are dispersed in a transparent resin 6, which is sandwiched between a pair of electrodes 4.4. A power source 7 is connected between the pair of electrodes 4.4, and voltage is applied and removed by turning on and off a switch 8, respectively. Figure 3(a)
As you can see, no voltage is applied! 3 (state where no electric field is applied), the liquid crystals 22 are randomly oriented, so light is scattered. As shown in Figure 3(b), 1
When a voltage is applied between the pair of electrodes 4.4, molecules of a nematic liquid crystal having positive dielectric anisotropy are aligned in the direction of the electric field. Therefore, the refractive index in the direction parallel to the electric field direction is ne
If the value of ne is close to the refractive index ns of the transparent resin 6, the transparency of the liquid crystal panel will be significantly increased.
上記の液晶パネルは、たとえば、下記■〜■のようにし
て作製されたものである。The above liquid crystal panel was manufactured, for example, as described in (1) to (2) below.
■ 液晶を内包したマイクロカプセルをエマルジョン中
に分散させることにより得られたもの。■ Obtained by dispersing microcapsules containing liquid crystals in an emulsion.
■ 液晶を含む高分子フィルムを多層（数十層）積層す
ることにより得られたもの。■ Obtained by laminating multiple layers (several tens of layers) of polymer films containing liquid crystals.
■ 液晶を混合した樹脂を硬化させることにより得られ
たもの。■ Obtained by curing resin mixed with liquid crystal.
上記■の液晶パネルは、液晶が流出しやすいという問題
点がある。■の液晶パネルは、フィルムを数十層も積層
するため、製造工程が複雑であるという問題点がある。The above liquid crystal panel (2) has a problem in that the liquid crystal tends to leak out. The liquid crystal panel (2) has a problem in that the manufacturing process is complicated because dozens of layers of films are laminated.
■の液晶パネルは、樹脂中に液晶が均一に分散し７にく
いという問題点を有する。The liquid crystal panel (2) has a problem in that the liquid crystal is uniformly dispersed in the resin.
そこで、この発明は、製造が容易であり、液晶の分散性
および担持性が向」ニジた液晶パネルを櫂供することを
課題とする。SUMMARY OF THE INVENTION An object of the present invention is to provide a liquid crystal panel that is easy to manufacture and has improved liquid crystal dispersibility and supporting properties.
上記課題を解決するため、この発明にかかる液晶パネル
は、透明樹脂からなるメソシュ材料に液晶が含浸されて
なる液晶保持層が１対の電極間に挟まれるようになって
いる。In order to solve the above problems, the liquid crystal panel according to the present invention has a liquid crystal holding layer formed by impregnating liquid crystal into a mesh material made of transparent resin and sandwiched between a pair of electrodes.
この発明にかかる液晶パネルは、液晶保持層が数十層も
積層する必要がないので製造が容易であり、液晶が透明
樹脂からなるメソシュ材料に含浸されているので液晶が
流出しにくく、メソシュ材料の「目−１が均一に分布し
ているのでその目に含浸されている液晶も均一に分布し
ている。The liquid crystal panel according to the present invention is easy to manufacture since there is no need to laminate dozens of liquid crystal holding layers, and since the liquid crystal is impregnated with a mesh material made of transparent resin, the liquid crystal does not easily flow out. Since the eyes 1 are uniformly distributed, the liquid crystal impregnated in the eyes is also uniformly distributed.
この発明で使用する液晶は、室温で液晶相をとり、かつ
、正の誘電率異方性を示すものであれば、特に限定はな
い。たとえば、ビフ、ニル系液晶、シクロへキシルカル
ボン酸エステル系液晶、フェニルシクロヘキサン系液晶
、ビフェニルシクロヘキサン系液晶などの中から１つが
適宜選択されて使用される。The liquid crystal used in this invention is not particularly limited as long as it takes a liquid crystal phase at room temperature and exhibits positive dielectric anisotropy. For example, one is appropriately selected and used from among BIF, Nyl-based liquid crystal, cyclohexylcarboxylic acid ester-based liquid crystal, phenylcyclohexane-based liquid crystal, biphenylcyclohexane-based liquid crystal, and the like.
液晶は、透明樹脂からなるメソシュ材料に含浸される。The liquid crystal is impregnated into a mesh material made of transparent resin.
ここで用いるメソシュ材料は、透明樹脂で構成されてい
ればよい。同透明樹脂は、熱可塑性樹脂が望ましく１．
より望ましくは、加熱することで熱融着し、他のろ明樹
脂やガラスなどの透明材料と接着するものがよい。たと
えば、ナイｖ′ｌｌンおよびその共重合体などのポリア
ミド系のホットメルト樹脂などが使用される。透明樹脂
は、繊、維の形態をとってい°Ｃもよい。The mesh material used here may be made of transparent resin. The transparent resin is preferably a thermoplastic resin.1.
More preferably, it is one that can be thermally fused by heating and adhered to other transparent materials such as filtration resin and glass. For example, polyamide-based hot melt resins such as polymers and copolymers thereof are used. The transparent resin may be in the form of fibers or fibers and may be heated at °C.
液晶をメツシュ材料に含浸さゼーる方法とり、ては、た
とえば、メツシフ材料を液晶中に浸漬し２て引き上げる
方法、または、ガラスなどの」二に置いたメツシュ材料
に液晶を滴下し、ガラス棒なとで流延する方法などがあ
る。メツシュ材料の粗さは、熱融着した後にメツシュの
各オープニング（「目」）の径が、数十ｌ１１１以下の
オーダ・−になるように選ぶことが好ましい。メソシｊ
、材料のオープニングの径がこの値よりも太き（なると
、液晶パネルの拡散状態と透明状態とのコントラストが
低下する傾向があるからである。A method of impregnating a mesh material with liquid crystal, for example, a method of immersing the mesh material in the liquid crystal and pulling it up, or a method of dropping the liquid crystal onto a mesh material placed on a glass rod, etc. There are ways to spread the word. The roughness of the mesh material is preferably selected such that, after heat-sealing, the diameter of each opening ("eye") of the mesh is on the order of a few tens of liters or less. Mesoji j
If the diameter of the opening of the material is larger than this value, the contrast between the diffused state and the transparent state of the liquid crystal panel tends to decrease.
なお、液晶をメソシ：Ｌ、材料に含浸させる量は、特に
限定はないが、たとえば、０．０１−１０．０ ｇ／ｄ
とする。この下限を下回ると、光拡散の効用が得られな
いことがあり、その１−限を１回ると、液晶が凝集しや
すくなり、均一に分散させにくくなることがある。Note that there is no particular limitation on the amount of liquid crystal impregnated into the material, for example, 0.01-10.0 g/d.
shall be. If it is less than this lower limit, the effect of light diffusion may not be obtained, and once the 1-limit is exceeded, the liquid crystal tends to aggregate and may become difficult to disperse uniformly.
第１図および第２図にみるように、液晶２２を透明樹脂
からなるメソシュ材料２１に含浸させてなる液晶保持層
２は、メソシュ材料と材質を同じくする熱融着フィルム
３，３で挟み、これを対向する１対の電極４．４の間に
セットして熱融着フィルムの溶融開始温度以上に加熱し
て電極に圧着し、液晶パネル１とする。または、熱融着
フィルムで挟まずに１対の電極間に七ノトシて電極と一
体化してもよい。前記熱融着フィルムは、メソシュ材料
の透明樹脂と同じ屈折率を有するならば、削材ネ」であ
ってもよい。前記加熱には、たとえば、ホットプレート
が用いられる。なお、必要に応じて、１対の電極の夕（
側から偏光板でさらに挟むようにしてもよい。偏光板は
、たとえば偏光軸が平行ないし直交となるように配置さ
れる。As shown in FIGS. 1 and 2, a liquid crystal holding layer 2 made by impregnating a liquid crystal 22 into a mesh material 21 made of a transparent resin is sandwiched between heat-sealing films 3 made of the same material as the mesh material. This is set between a pair of opposing electrodes 4.4, heated to a temperature higher than the melting start temperature of the heat-sealable film, and pressed to the electrodes to form the liquid crystal panel 1. Alternatively, it may be integrated with the electrodes by inserting them between a pair of electrodes without sandwiching them between heat-sealing films. The heat-sealing film may be made of a cut material as long as it has the same refractive index as the transparent resin of the mesh material. For example, a hot plate is used for the heating. In addition, if necessary, a pair of electrodes (
It may be further sandwiched between polarizing plates from the sides. The polarizing plates are arranged, for example, so that their polarization axes are parallel or orthogonal.
前記電極としては、たとえば、ＩＴＯ（酸化インジウム
錫）など、通常、透明電極として用いられるものが使用
される。電極は、ガラスＷ板などに担持されていてもよ
い。As the electrode, a material that is normally used as a transparent electrode, such as ITO (indium tin oxide), is used. The electrode may be supported on a glass W plate or the like.
この発明にかかる液晶パネルは、１対の電極間に電圧を
印加することにより、液晶が正の誘電率異方性を有する
ネマチック液晶であれば、液晶分子が電界の印加方向に
配向し、この方向の屈折率がｎｅ （液晶の異常光線
に対する屈折率）となる。このｎｅＯ値がメツシュ材料
の透明樹脂の屈折率ｎｓ と同じまたは近いものである
と、この状態のときに透明性が著しく増加することにな
る。反対に、電圧を切ると液晶の配向状態がランダムに
なり、液晶の異常光線および常光線に対する各屈折率ｎ
ｅおよびｎｏの方向が乱雑になり、光が散乱する。In the liquid crystal panel according to the present invention, by applying a voltage between a pair of electrodes, if the liquid crystal is a nematic liquid crystal having positive dielectric constant anisotropy, the liquid crystal molecules are aligned in the direction of application of the electric field. The refractive index in this direction is ne (refractive index of liquid crystal for extraordinary rays). If this neO value is the same as or close to the refractive index ns of the transparent resin of the mesh material, the transparency will be significantly increased in this state. On the other hand, when the voltage is turned off, the orientation state of the liquid crystal becomes random, and each refractive index n for the extraordinary ray and ordinary ray of the liquid crystal
The directions of e and no become cluttered, and the light is scattered.
この発明にかかる液晶パネルは、液晶がメツシュ材料に
含浸されているため、均一に分散していて光の拡散性が
良く、かつ、液晶の担持性も良好である。この発明にか
かる液晶パネルは、たとえば、表示材料、照明器具用フ
ィルター、照明器具カバー、窓用ブライドなどの用途に
用いることができる。なお、用途によっては、液晶パネ
ル全面に液晶が均一に分布している必要はなく、たとえ
ば、所望の範囲において均一に分布している、といった
ことも可能である。このようにする場合、たとえば、液
晶をメツシュ材料の所望の範囲にだけ含浸させるのであ
る。In the liquid crystal panel according to the present invention, since the liquid crystal is impregnated into the mesh material, it is uniformly dispersed, has good light diffusivity, and has good liquid crystal support. The liquid crystal panel according to the present invention can be used, for example, as a display material, a lighting equipment filter, a lighting equipment cover, a window blind, and the like. Note that, depending on the application, the liquid crystal does not need to be uniformly distributed over the entire surface of the liquid crystal panel; for example, it is possible to uniformly distribute the liquid crystal within a desired range. In this case, for example, only the desired areas of the mesh material are impregnated with liquid crystal.
以下に、この発明のより具体的な実施例を示すが、この
発明は、下記実施例に限定されない。More specific examples of the present invention will be shown below, but the invention is not limited to the following examples.
一実施例１一
液晶として、ビフェニルシクロヘキサン系液晶（？１ｅ
ｒｃｋ ｉ！１２ Ｌ １−１８４０）を用いた。Example 1 A biphenylcyclohexane liquid crystal (?1e
rck i! 12 L 1-1840) was used.
透明樹脂からなるメツシュ材料として、熱融着性ナイロ
ンスクリーン（１３０メツシュ／ｃｓ、Ｉｌｌ径３０μ
亀、オープニング４７μｍ）を用いた。A heat-adhesive nylon screen (130 mesh/cs, Ill diameter 30 μm) was used as a mesh material made of transparent resin.
Tortoise, opening 47 μm) was used.
透明樹脂からなるメツシュ材料を液晶に浸漬して液晶を
含浸した後、前記メツシュ材料と同じ材質の熱融着フィ
ルム（厚み３０ｐｍ）に挟み、対向する透明導電膜（Ｉ
ＴＯ）付きガラス（２０ｍｓｘ２０鶴×厚み１．１龍、
５０Ω／ｌシ）の間に置いて、ホットプレート上で８０
℃に加熱し、圧着して液晶パネルを得た。A mesh material made of a transparent resin is immersed in liquid crystal to be impregnated with the liquid crystal, and then sandwiched between heat-sealing films (thickness 30 pm) made of the same material as the mesh material, and an opposing transparent conductive film (I
TO) with glass (20ms x 20 cranes x thickness 1.1 dragon,
50 Ω/l) and heat it on a hot plate at 80 Ω/l.
It was heated to ℃ and pressed to obtain a liquid crystal panel.
実施例１では、液晶の含浸量は、０．０８ｇ／ｒｒｆで
あった。In Example 1, the amount of liquid crystal impregnated was 0.08 g/rrf.
一実施例２一
実施例１において、メツシュ材料として、熱融着性ナイ
ロンスクリーン（１５０メソシユ／ｃＩｎ、線径３０μ
論、オープニング３７μ）を使用したこと以外は、実施
例１と同様にして液晶パネルを作製した。Example 2 In Example 1, a heat-fusible nylon screen (150 mesh/cIn, wire diameter 30 μm) was used as the mesh material.
A liquid crystal panel was produced in the same manner as in Example 1, except that an opening of 37μ) was used.
実施例２では、液晶の含浸量は、０．０６ｇ／’ｒ＋？
であった。In Example 2, the amount of liquid crystal impregnated was 0.06 g/'r+?
Met.
一実施例３一
実施例１において、メツシュ材料として、熱融着性ナイ
ロンスクリーン（１８０メソシユ／ ｃｍ、線径３０μ
１１オープニング２５μ曹）を使用したこと以外は、実
施例１と同様にして液晶パネルを作製した。Example 3 In Example 1, a heat-fusible nylon screen (180 mesh/cm, wire diameter 30 μm) was used as the mesh material.
A liquid crystal panel was produced in the same manner as in Example 1, except that 11 opening (25μ carbon dioxide) was used.
実施例３では、液晶の含浸量は、０．０２ｇ／イであっ
た。In Example 3, the amount of liquid crystal impregnated was 0.02 g/I.
実施例１〜３の各液晶パネルについて、分光透過率（平
行透過率および拡散透過率）およびヘイズ値を、通常の
とき、および、透明導電膜間にＡＣ６０Ｖを印加したと
きのそれぞれについて調べた。また、液晶の流出の有無
、液晶の分散状態を光学顕微鏡で調べた。結果を第１表
に示した。For each of the liquid crystal panels of Examples 1 to 3, the spectral transmittance (parallel transmittance and diffuse transmittance) and haze value were examined in normal conditions and when AC60V was applied between the transparent conductive films. In addition, the presence or absence of liquid crystal leakage and the dispersion state of liquid crystal were examined using an optical microscope. The results are shown in Table 1.
第２図
第１表にみるように、実施例の名液晶パネルは、液晶の
流出がなく、液晶の分散がほぼ良好または良好であった
。As shown in FIG. 2 and Table 1, in the liquid crystal panels of Examples, there was no leakage of liquid crystal, and the dispersion of liquid crystal was almost good or good.
この発明にかかる液晶パネルは、以」−のように構成さ
れているので、製造が容易であり、液晶の分散性および
担持性が向上したものとすることができる。Since the liquid crystal panel according to the present invention is configured as follows, it is easy to manufacture and can have improved dispersibility and supporting ability of liquid crystal.
第１図はこの発明の液晶パネルの１実施例を表す斜視図
、第２図はその分解斜視図、第３図（ａ）。
（ｂｌは液晶の配向状態を表す断面図である。
１・・・液晶パネル ２・・・液晶保持層 ４・・・透
明電極 ２１・・・透明樹脂からなるメソシェ材料 ２
２・・・液晶
代理人 弁理士 松 本 武 彦
図
（ｂ）FIG. 1 is a perspective view showing one embodiment of the liquid crystal panel of the present invention, FIG. 2 is an exploded perspective view thereof, and FIG. 3(a). (bl is a cross-sectional view showing the alignment state of liquid crystal. 1... Liquid crystal panel 2... Liquid crystal holding layer 4... Transparent electrode 21... Mesochet material made of transparent resin 2
2...LCD agent Patent attorney Takehiko Matsumoto (b)
Claims (1)
なる液晶保持層が１対の電極間に挟まれてなる液晶パネ
ル。1. A liquid crystal panel in which a liquid crystal holding layer made of a mesh material made of transparent resin impregnated with liquid crystal is sandwiched between a pair of electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15766988A JPH026924A (en) | 1988-06-24 | 1988-06-24 | Liquid crystal panel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15766988A JPH026924A (en) | 1988-06-24 | 1988-06-24 | Liquid crystal panel |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH026924A true JPH026924A (en) | 1990-01-11 |
Family
ID=15654792
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15766988A Pending JPH026924A (en) | 1988-06-24 | 1988-06-24 | Liquid crystal panel |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH026924A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02282718A (en) * | 1989-04-25 | 1990-11-20 | Ube Ind Ltd | Liquid crystal composite film and production thereof |
| JPH04168422A (en) * | 1990-10-31 | 1992-06-16 | Sharp Corp | Liquid crystal display device |
-
1988
- 1988-06-24 JP JP15766988A patent/JPH026924A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02282718A (en) * | 1989-04-25 | 1990-11-20 | Ube Ind Ltd | Liquid crystal composite film and production thereof |
| JPH04168422A (en) * | 1990-10-31 | 1992-06-16 | Sharp Corp | Liquid crystal display device |
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