JPS6238422A - Electrode plate for color display device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an electrode plate for a color display device used in a display device displaying at least two or more colors.

(Conventional technique) Conventional technique #? , - This will be explained using a conventional example and FIG. 2 showing its plan view.

In the effective display area on the glass plate (1) having a thickness of 1 to 1.1 mm, transparent electrodes (2) are stamped in a band shape at a constant pitch, and a color filter (tR) is placed on the transparent plate.

(G, +Bl b″-Laminated.

In addition, in the non-effective display area, there is only a transparent polarization (2) on the glass substrate (2)! - It is simply extended in a band shape to form the terminal part [3].

(Intermediate point to be solved by the invention) To explain the case where the color display device is for liquid crystal, ordinary monochrome dot matrix displays such as e and crystal are different from liquid crystal in terms of driving conditions and light transmittance. Thickness is 8μrr
L@ later became the 4 kings. However, in the structure of a liquid crystal dot matrix that has a color filter on its inner surface, the color filter itself is considered to be an insulator, and there is a vertex between the upper and lower ends and the polarization, and the effective depth between the two ends becomes an inclusion. setting? It was making it difficult.

Also, is this kind of dot matrix death spray display comparable to a color TV? In order to achieve this, it is necessary to miniaturize the donot size and the pinch of the transparent electrode, especially at 100 μm.
~400 μm It was difficult to connect terminals in a pinch using conventional technology.

In order to solve this problem, there was an idea as shown in Japanese Utility Model Application Laid-Open No. 58-77324/ll"-1, but it was still insufficient.

In addition, in order to increase the information density displayed on a color display using a liquid crystal display, it is necessary to make the pattern finer as described above, but such a finer pattern requires an increase in the number of scanning lines and a high data rate (drive). , especially for displays using color filters such as liquid crystals, depending on the case, 1 to 2
Display unevenness due to unevenness and steps of the micrometer-thick color filter itself, or low F LCD life? I was invited. Because of this, more advanced display quality? It was the most difficult thing to ask for.

(Maeno?Means for solving the problem) Does the present invention provide an extension or electrical connection from the transparent electrode of the effective display area on the transparent substrate to the metal thin film pattern of the non-effective display area? From the applied acid electrode for a color display device, the metal Ill pattern b' in the non-effective display area - the terminal parts arranged in rows for each color, and the transparent electrode in the active display area? consisting of a lead portion to be connected, and at least a portion of the lead portion? This is an electrode plate for a color display device characterized by being covered with an overcoat.

(Function) Since the terminals are arranged every two rows according to the number of colors, it is possible to increase the surface of the terminal part + trv by 6", which makes heat sealing and soldering possible in the same bonding method. The increase in surface +f of the adhesive conductive part also contributes to a reliable connection.Also, by applying an overcoat to cover the part of the lead part that corresponds to the periphery of the other terminal part, The amount of adhesive conduction to the terminal has been reduced, making the adhesive conduction process easier.

(Details of the invention explanation? This will be explained in detail using FIG.

First put nickel etc. on the glass plate 11) which is a transparent substrate?
The transparent electrode (2), the lead part (4), and the terminal part (3) are formed by stamping, and then the sequential R pattern, G butter 7,
B pattern and color filter 1ll () iG iB
l 'aj form, 'ffl. Next, an overcoat pattern is layered on the color filter +R (G (B) and the lead part (4), and the color filter is smoothed on the color filter.

What is the role of leveling? Furthermore, the lead portion (4) plays the role of preventing short circuits with adjacent portions during connection and improving the yield and reliability of the product.

The overcoat (5) on the lead part (4) is 0.3 to 3
Height in μm? 1 on the resin film by holding it.
The flexible connector, which has a conductive band formed by printing or plating with a width of 00 to 500 μm and a thickness of about 1 to 10 μm, can be easily aligned by fitting the concavities and convexities, and the reliability of the connection is improved. In addition, the seal m t61
Do not wear an overcoat (5).

This makes it possible to prevent a reduction in the life of the element near the sealing portion due to moisture permeation. In this case, the overcoat material should serve the purpose of smoothing and insulation. The focus is often on polyester, polyamide,
Quadruple resin such as gelatin and epoxy? to usebζ
It is possible.

In addition, the metal thin film consisting of the lead part (4) and the terminal part (3) is provided at the end of the lead part (4) and near the effective display part so as to overlap with the transparent electrode (2). They communicate with each other. At this time, the lead part (4) and the terminal part 13) are made of Ni? Although it is the main material.

Adhesion strength with glass substrate +11? To improve Co (
Other elements such as Cobalt (cobalt) and Cr (Chromium) are often added, and C is sometimes added as an undercoat layer to further improve adhesion. What do you mean by integrating the glass substrate and drive circuit?When considering, Au (gold),
Terminal parts such as A-gc silver), SnC tin), CuC copper], At (aluminum), solder [lead-tin alloy], etc. +31
It may be K-plated. Furthermore, if necessary, an undercoating of 5i02 (silicon oxide) or the like may be applied to the transparent substrate, or 5i02 may be further laminated on the top surface of the oat coating to form an ion-blocking layer.

Also, a metal thin film pattern? It may also be provided by extending the transparent electrode.

In addition, in this explanation, we mainly used liM in the case of liquid crystal, but guest host, twisted nematic, super twisted nematic, dynamic centering, dielectric liquid crystal, etc. can all be used as liquid crystal materials. Naturally, the present invention can be applied not only to liquid crystal display devices but also to light-emitting type electroluminescent displays.

It goes without saying that the present invention can be modified in various ways as long as the gist of the invention is not changed.

A more detailed explanation will be given below based on examples.

[Example 1] Chromium 7500λ was deposited on a float glass plate having a size of 250 m x 200 m and a thickness of 1.1 mm by vacuum deposition.

After sniffing nickel 24oooM and attaching a film, the first
Litho; ζ wobbling resist battanning and etching 779, metal thin film pattern? Formed.

Next, we applied R, G, and B color filters with a stripe pattern of 290 μm line width and 300 μm pitch in total.
720 slams in the 1lfffl direction.

Further, the color filter is made of gelatin material and is formed by a known method. Same material (gelatin)? An overcoat pattern with a thickness of 1 μm? Formed.

Next, transparent electrodes on the color filter substrate? 99, 99
% of indium and tin using -C binary evaporation method at substrate temperature? Room temperature, oxygen partial pressure 4X10' torr, high frequency voltage 3 kV, film thickness 1100λ, transmittance 81%5
Area resistance value 65Ω/ITO membrane at the mouth? A film was formed. The tin oxide in the ITO model formed in this manner was about 10 mol %. Next, ITOt was battened in stripes on the color filter with a line width of 270 μm and a pitch of 300 μm. Also.

Battanning was performed using the same photolithography method as above, and etching was performed for 3 minutes using a 5% aqueous hydrochloric acid solution.

Next, the nickel terminal and the ITO stripe were stamped so that they overlapped by 0.5 length, and the end face of the nickel terminal was left as a nickel surface. After drying the substrate, apply Hitachi Chemical Co., Ltd.'s polyimide alignment film material HL-11002 nickel terminal part and seal part. Remove and apply and dry for 150C1hr 6
Form an alignment film on 00 and form an alignment film? It was added as an electric wire plate for a color display device.

[Example 2] 5102 (silicon oxide)'f was sputtered onto a float glass plate with a size of 5 inches square and a thickness of 1.1 wrs.
:500 ;y, nickel? j000A, i added.

Nickel terminal ends to be further plated with gold? Almost the entire surface was covered with photoresist, and the mask was slammed?
After forming, gold plating with a thickness of 400077 mm was performed.

Gold plating was performed using a cyanide gold bath, which is a known technique. Mask pattern? After dissolving and removing with alkali, Example 1
By the same Folin method, nickel? It was battened to form a metal thin film pattern.

Next is gelatin? Dot size 190 μm x 590
μm color filter? A color filter pattern was created by arranging 480 pieces of R%G and B alternately at a pitch of 200 μm in the X direction (190 μm direction) and 128 pieces arranged at a pitch of 600 ttm in the Y direction. Coated with the same material to a thickness of 0.5 μm and coated with nickel. An overcoat pattern was created by exposing and developing the color filter to almost cover it, except for the terminals and seals.

Next is the sputtering equipment, an indium oxide target containing 5% by weight tin oxide2? Argon flow rate sosccM, high frequency effective power 300W, oxygen partial pressure lX10 torr
An ITO model sputtered with a film thickness of 1200λ? It was imitated. The substrate temperature at this time is room temperature. The ITO film thus formed had a transmittance of 83% and a resistance value of 42Ω/hole.

Next, the line width was 1-70 μm using the same photolithography method as in Example 1.
It was stamped with ITO stripes with a pitch of 200 μm to form a transparent electrode pattern. however.

The stripe has a pattern that is divided into upper and lower parts in the center.

(Effects of the Invention) According to the present invention, since the width of the terminal portion of the metal thin film pattern was conventionally narrow, precision was required for connection, and when the pitch of the stripes was on the order of 100 μm, connection was difficult and accurate. Narrowing the conductive pixel pitch b
;It becomes possible and the resolution bζ is improved by 1.

Example @- Partial plane shown ← Ginkaihiro → Appetizer → Fig. 2
Is the figure a conventional solid plate for color display devices? The part shown←
←÷Song→→→Figure.

(1)...Glass plate (2)...Transparent electrode (
(support) f(El (Bl...color filter)
(3)...Terminal part (4)...Lead part (5
)...Overcoat (6)...Seal part

Claims (1)

[Claims] 1) In an electrode plate for a color display device in which a transparent electrode in an effective display area on a transparent substrate is extended or electrically connected to a metal thin film pattern in an ineffective display area, the metal thin film pattern is different for each color. What is claimed is: 1. An electrode plate for a color display device, comprising terminal portions arranged in a row and a lead portion connecting transparent electrodes in an effective display portion, and at least a portion of the lead portion being covered with an overcoat.