JPS63183422A - Liquid crystal color display panel - Google Patents

Abstract

PURPOSE:To obtain a liquid crystal display panel which obviates generation of uneven display images and flickers by providing a wiring having the surface resistance smaller than the surface resistance of a transparent electrode film to the outside circumferential part of the transparent electrode film covering the color filter on a glass substrate and passing the current on the transparent conductive film quickly to the outside circumferential part. CONSTITUTION:The color filter 2 is formed on the glass substrate 1 and is coated with the transparent electrode film 3. Since the surface resistance of the film 3 is high, the currents corresponding to about 100,000 picture elements are irregular and the images are disturbed by the generation of a potential distribution on the film 3. The wiring 14 having the surface resistance smaller than the surface resistance of the film 3 is, therefore, provided on the outside circumferential part of the film 3 to take out the above-mentioned current quickly. The liquid crystal display body which obviates the generation of the uneven display images and flickers is thus obtd.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は液晶カラーテレビ等に使用するカラー表示パネ
ルに係るものであり、特にカラーフィルタ用の電極構成
の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color display panel used in a liquid crystal color television or the like, and particularly relates to an improvement in the electrode structure for a color filter.

従来の技術 従来液晶カラー表示パネルのカラーフィルタ部分は第４
図の様に構成されている。Conventional technology The color filter portion of a conventional liquid crystal color display panel is
It is configured as shown in the figure.

第４図において、Ａはカラーフィルタ部分の断２ベーン 面図であり、ＢはＡを下から見た平面図であり、１は透
明なガラス基板、２は赤色、青色、緑色の各絵素が配列
されたカラーフィルタ、３は透明電極膜、４は液晶を配
向させるための透明な配向膜、６は外部の導線（図示せ
ず）と透明電極膜３を接続する電極取り出し口である。In Fig. 4, A is a cross-sectional two-vane view of the color filter part, B is a plan view of A seen from below, 1 is a transparent glass substrate, 2 is each red, blue, and green picture element. 3 is a transparent electrode film, 4 is a transparent alignment film for aligning the liquid crystal, and 6 is an electrode outlet for connecting the transparent electrode film 3 to an external conducting wire (not shown).

パネルの構造を更に詳細に説明すると、・（ネルはカラ
ーフィルタ部と薄膜トランジスタを配置したアレイ部と
それらの間に注入した液晶部から構成されている。第５
図はその概略構成図を示したもので、ａはカラーフィル
タ部、ｂはアレイ部、Ｃは液晶部である。カラーフィル
タ部ａは前述の様にガラス基板１．カラーフィルタ２．
透明電極膜３．配向膜４から成り、アレイ部すは、ゲー
ト電極６と絶縁膜７と半導体膜８とソース電極９とドレ
、イン電極１ｏで構成された薄膜トランジスタとアレイ
側の透明電極膜１１．及びカラーフィルり部自と同様な
透明なガラス基板１′と配向膜４′より成る。To explain the structure of the panel in more detail: (The panel consists of a color filter section, an array section in which thin film transistors are arranged, and a liquid crystal section injected between them.
The figure shows a schematic configuration diagram thereof, in which a is a color filter section, b is an array section, and C is a liquid crystal section. As mentioned above, the color filter section a is made of glass substrate 1. Color filter 2.
Transparent electrode film 3. The array part consists of an alignment film 4, a thin film transistor composed of a gate electrode 6, an insulating film 7, a semiconductor film 8, a source electrode 9, a drain and an in electrode 1o, and a transparent electrode film 11 on the array side. It also consists of a transparent glass substrate 1' and an alignment film 4' similar to the color fill section itself.

この様にしてパネルを構成し、２枚の透明電極３１、−
７ 膜１１と３に電圧を印加してその間にはさまれた誘電体
である液晶の配向度合いを変えて、パネル下部から照射
される入射光１２のうちパネルを通過する透過光１３の
強度を可変して画像を表示している。A panel is constructed in this way, and two transparent electrodes 31, -
7 By applying a voltage to the films 11 and 3 and changing the degree of orientation of the liquid crystal, which is a dielectric material sandwiched between them, the intensity of the transmitted light 13 that passes through the panel among the incident light 12 irradiated from the bottom of the panel can be changed. The image is displayed by changing it.

発明が解決しようとする問題点 上述の様に、パネルは２枚の透明電極の間に誘電体であ
る液晶をはさんだ構成であり、コンデンサと同等の構造
を有している。Problems to be Solved by the Invention As described above, the panel has a structure in which liquid crystal, which is a dielectric material, is sandwiched between two transparent electrodes, and has a structure similar to that of a capacitor.

良く知られている様に、コンデンサに一定の直流電圧を
印加すると、第６図に示した様に充電電流とリーク電流
が流れる。一般に液晶パネルは交流で駆動されるが、そ
の場合には第７図の様に２枚の透明電極膜間に電流が流
れる。従って、２枚の透明電極膜は電流をすみやかに取
り出すために低抵抗である事が要求される。As is well known, when a constant DC voltage is applied to a capacitor, charging current and leakage current flow as shown in FIG. Generally, liquid crystal panels are driven by alternating current, and in that case, current flows between two transparent electrode films as shown in FIG. Therefore, the two transparent electrode films are required to have low resistance so that current can be drawn out quickly.

ところが、透明電極膜は一般にスパッタリング法により
作成する酸化インジウム・スズ膜が用いられるが、成膜
時もしくは成膜後に約４ｏ○〜５００℃に加熱し々いと
低抵抗な電極膜が得られない。アレイ部の透明電極膜は
その周辺に熱に弱い材料が使われていないため成膜時も
しくは成膜後に十分に加熱する事ができるが、カラーフ
ィルタ部の透明電極膜は、その下地となるカラーフィル
タに有機物が使用されるため高温に加熱する事ができな
い。However, although an indium tin oxide film prepared by a sputtering method is generally used as a transparent electrode film, a low resistance electrode film cannot be obtained if the film is heated to about 4°C to 500°C during or after film formation. The transparent electrode film in the array section does not contain heat-sensitive materials around it, so it can be sufficiently heated during or after film formation. Since the filter uses organic matter, it cannot be heated to high temperatures.

透明電極膜は第８図に示す様に、その膜厚を厚くすれば
表面抵抗を下げることができる。しかし、同時に光の透
過率も低下してしまうため表示画像が暗くなってしまう
。そのためにカラーフィルタ部の透明電極は薄くしなけ
ればならず、透明電極は高い抵抗のものしか作れなかっ
た。As shown in FIG. 8, the surface resistance of the transparent electrode film can be lowered by increasing its thickness. However, at the same time, the light transmittance also decreases, resulting in a dark displayed image. For this reason, the transparent electrodes in the color filter section had to be made thinner, and only transparent electrodes with high resistance could be made.

一方、アレイ部には絵素に対応する数万から約十万個の
透明電極膜が整然と配置されており、ある瞬間にはその
１個づつの透明電極膜から流れる電流をカラーフィルタ
部の透明電極膜が受ける事になる。ところが、カラーフ
ィルタ部の透明電極膜の抵抗が大きいと、受けた電流を
すみやかに流す事ができず、透明電極膜上に電位分布が
生じてし寸う。この様子を第９図に示した。ある瞬間に
５　ヘ一／゛ は透明電極膜３に図中破線で示しだ様に電極取り出し口
５に向かって電位分布が生じてし１う（図中簡単のため
配向膜は省略している）。この様な電位分布が生じると
、例えば点ａで受けた電流は等電位面を直角に横切る様
に矢印の方向に流れなければならず、抵抗の大きな透明
電極膜３中を長い距離通過しなければならないために、
すみやかに電流を流す事ができない。そして、図の様に
電位分布が生じてし１うと、液晶に印加される電圧が変
ってしまうために、表示画像にむらが生じたり、あるい
はフリッカ−と呼ばれる画像のちらつきが発生するとい
う問題点があった。On the other hand, in the array section, tens of thousands to about 100,000 transparent electrode films corresponding to picture elements are arranged in an orderly manner, and at a certain moment, the current flowing from each transparent electrode film is transferred to the transparent electrode film of the color filter section. The electrode film will be affected. However, if the resistance of the transparent electrode film in the color filter section is high, the received current cannot flow quickly, and a potential distribution is likely to occur on the transparent electrode film. This situation is shown in FIG. At a certain moment, a potential distribution occurs in the transparent electrode film 3 toward the electrode outlet 5 as shown by the broken line in the figure (the alignment film is omitted for simplicity in the figure). ). When such a potential distribution occurs, for example, the current received at point a must flow in the direction of the arrow so as to cross the equipotential surface at right angles, and must pass a long distance through the transparent electrode film 3 with high resistance. In order to avoid
Current cannot flow quickly. When a potential distribution occurs as shown in the figure, the voltage applied to the liquid crystal changes, causing unevenness in the displayed image or flickering of the image, which is a problem. was there.

問題点を解決するだめの手段 そこで本発明は上記問題点を解決するために、カラーフ
ィルタ上を覆う透明電極膜の外周部に、透明電極膜より
表面抵抗の小さい配線を設ける。Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides wiring having a surface resistance smaller than that of the transparent electrode film on the outer periphery of the transparent electrode film covering the color filter.

作　　用 」二記手段により、透明電極膜上の電流は外周部の配線
を通ってすみやかに流れることができる。By means of the second function, the current on the transparent electrode film can quickly flow through the wiring on the outer periphery.

実施例 ６ペーｉ 本発明の第１の実施例を第１図を参照しながら説明する
。第１図ａ、ｂは本発明のカラーフィルタ部を第４図ａ
、ｂに対応して図示したものであるが、ガラス基板１上
に形成したカラーフィルタ２を覆う透明電極膜３の外周
部に、透明電極膜３より表面抵抗の小さい配線１４を設
けている。４は配向膜であり、５は電極取出口である。Embodiment 6 Page i A first embodiment of the present invention will be described with reference to FIG. Figures 1a and b show the color filter section of the present invention in Figure 4a.
, b, wiring 14 having a smaller surface resistance than the transparent electrode film 3 is provided on the outer periphery of the transparent electrode film 3 that covers the color filter 2 formed on the glass substrate 1. 4 is an alignment film, and 5 is an electrode outlet.

ここで配線１４は例えば金を主成分とする薄膜もしくは
厚膜であり、カラーフィルタ２を形成する前の段階で、
ガラス基板１上に、金のターゲットを用いたスパッタリ
ング法もしくは金ペーストを用いた印刷法であらかじめ
作成しておく。その後カラーフィルタ２．透明電極膜３
．配向膜４を作成する。Here, the wiring 14 is, for example, a thin film or a thick film containing gold as a main component, and at a stage before forming the color filter 2,
It is prepared in advance on the glass substrate 1 by a sputtering method using a gold target or a printing method using a gold paste. Then color filter 2. Transparent electrode film 3
．． An alignment film 4 is created.

上記構成により、配線１４を通じて透明電極膜３の外周
部が電極取出口６と同電位になるため、従来例の第９図
に対応する電位分布を第２図の破線の様に変える事がで
き、例えばａ点で受けた電流は図中矢印の様に先ず配線
１４に集１り電線取出口５１で流れて行く。すなわち、
従来例の第９７　′＼−／ 図と比較すると明らかな様に本発明では電流が抵抗の高
い透明電極膜３を通過する距離が短いために、すみやか
に電流を取取り出すことができ、透明電極膜３上の電位
分布を少くすることができる。With the above configuration, the outer periphery of the transparent electrode film 3 has the same potential as the electrode outlet 6 through the wiring 14, so the potential distribution corresponding to the conventional example shown in FIG. 9 can be changed to the one shown by the broken line in FIG. For example, the current received at point a is first collected in the wiring 14 and flows through the wire outlet 51 as indicated by the arrow in the figure. That is,
As is clear from a comparison with Figure 97'\-/ of the conventional example, in the present invention, since the distance through which the current passes through the transparent electrode film 3 having high resistance is short, the current can be taken out quickly, and the transparent electrode The potential distribution on the membrane 3 can be reduced.

そのために、表示画像のむらやフリッカ−の少いパネル
を得ることができる。尚、第２図では第９図と同様に配
向膜は省略している。Therefore, a panel with less unevenness and flicker of displayed images can be obtained. Note that the alignment film is omitted in FIG. 2 as in FIG. 9.

次に本発明の第２の実施例を第３図ａ、ｂを参照しなが
ら説明する。本発明の主旨は、カラーフィルタ部の透明
電極の外周部に表面抵抗の小さい配線を設けた事にある
。Next, a second embodiment of the present invention will be described with reference to FIGS. 3a and 3b. The gist of the present invention is to provide wiring with low surface resistance on the outer periphery of the transparent electrode of the color filter section.

第８図に示す様に透明電極膜は膜厚が厚くなると表面抵
抗が小さくなる。従って、第３図の様に透明電極膜の厚
さを、カラーフィルタを覆う部分よ・り外周部で厚く構
成して表面抵抗の小さい配線を構成しても良い。第３図
も第４図に対応して図示しているが、カラーフィルタを
覆う透明電極膜３ａよりも、その外周部の透明電極膜３
ｂを厚く構成して配線を作っそいる。この第２の実施例
による電位分布も第２図と同様である。As shown in FIG. 8, the surface resistance of the transparent electrode film decreases as the film thickness increases. Therefore, as shown in FIG. 3, the thickness of the transparent electrode film may be made thicker at the outer circumferential portion than at the portion covering the color filter, thereby forming wiring with low surface resistance. Although FIG. 3 is also illustrated corresponding to FIG. 4, the transparent electrode film 3a on the outer periphery of the color filter is
Make wiring by configuring b thickly. The potential distribution according to this second embodiment is also similar to that shown in FIG.

この場合の透明電極膜３ａと３ｂの作成方法は、ガラス
基板１上にカラーフィルタ２を作成した後に先ず外周部
の透明電極膜３ｂを成膜し、次いでカラーフィルタを覆
う透明電極３ａを成膜する。In this case, the method for creating the transparent electrode films 3a and 3b is to first form the transparent electrode film 3b on the outer periphery after forming the color filter 2 on the glass substrate 1, and then form the transparent electrode 3a to cover the color filter. do.

あるいは１だ、カラーフィルタ２を作成する前に、ガラ
ス基板１上に透明電極膜を高温で成膜するか、もしくは
成膜後に高温に加熱して表面抵抗の小さい透明電極膜を
作成して、これをエツチングすることにより外周部の配
線３ｂを作成し、カラーフィルタ２を作成後、透明電極
膜３ａを作成しても良い。Or 1, before creating the color filter 2, a transparent electrode film is formed on the glass substrate 1 at a high temperature, or after the film is formed, it is heated to a high temperature to create a transparent electrode film with low surface resistance. By etching this, the outer peripheral wiring 3b may be created, and after the color filter 2 is created, the transparent electrode film 3a may be created.

発明の効果 本発明により、表示画像のむらがなく、フリッカ〜の生
じない液晶表示パネルを得る事ができる。Effects of the Invention According to the present invention, it is possible to obtain a liquid crystal display panel in which display images are uniform and flicker does not occur.

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

第１図は本発明の第１の実施例の液晶カラー表示パネル
の要部概略構成図、第２図は同表示パネル透明電極膜上
の電位分布図、第３図は本発明の第２の実施例の液晶カ
ラー表示パネルの要部概略構成図、第４図は従来例の液
晶カラー表示パネル９へ一／゛ の要部概略構成図、第５図は同液晶カラー表示パネルの
概略構成図、第６図はコンデンサに直流電圧を印加した
時に流れる電流の特性図、第７図はコンデンサに交流電
圧を印加した時に流れる電流の特性図、第８図は透明電
極膜の膜厚と表面抵抗及び透過率の関係図、第９図は従
来例による透明電極膜上の電位分布図である。 １・・・・・ガラス基板、２・・・・・カラーフィルタ
、３・・・・・・透明電極膜、１４・・・・・・配線。 代理人の氏名　弁理士　中　尾　敏　男　ほか１名第１
図 第２図 第３図 第４図FIG. 1 is a schematic diagram of the main parts of a liquid crystal color display panel according to the first embodiment of the present invention, FIG. 2 is a potential distribution diagram on the transparent electrode film of the same display panel, and FIG. FIG. 4 is a schematic diagram of the main parts of the liquid crystal color display panel 9 of the example. FIG. 4 is a schematic diagram of the main parts of the liquid crystal color display panel 9 of the conventional example. FIG. , Figure 6 is a characteristic diagram of the current flowing when a DC voltage is applied to the capacitor, Figure 7 is a characteristic diagram of the current flowing when an AC voltage is applied to the capacitor, and Figure 8 is the film thickness and surface resistance of the transparent electrode film. and transmittance, and FIG. 9 is a potential distribution diagram on a transparent electrode film according to a conventional example. 1... Glass substrate, 2... Color filter, 3... Transparent electrode film, 14... Wiring. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 Figure 4

Claims (2)

【特許請求の範囲】[Claims] （１）ガラス基板上に形成したカラーフィルタを覆う透
明電極膜の外周部に、前記透明電極膜より表面抵抗の小
さい配線を設けた液晶カラー表示パネル。(1) A liquid crystal color display panel in which wiring having a surface resistance lower than that of the transparent electrode film is provided on the outer periphery of a transparent electrode film that covers a color filter formed on a glass substrate. （２）外周部の配線が、カラーフィルタ上を覆う透明電
極膜より膜厚を厚くした透明電極膜である特許請求の範
囲第１項記載の液晶カラー表示パネル。(2) The liquid crystal color display panel according to claim 1, wherein the wiring on the outer periphery is a transparent electrode film that is thicker than the transparent electrode film that covers the color filter.