JPS595271A - Construction of flat matrix display panel - 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 The present invention relates to the structure of a flat matrix display panel, and more particularly to the structure of a drive circuit module for a small portable display device.

In recent years, the development of liquid crystal televisions as small portable display devices has been actively promoted. This liquid crystal television can be made thin and is considered very promising as a portable television. The image display methods can be roughly divided into active matrix methods, in which a silicon substrate on which a liquid crystal drive circuit is formed is placed on the back substrate of the liquid crystal cells that make up the display screen, and active matrix methods, which are an extension of the display methods used in conventional calculators and watches. There are two time-sharing methods. To explain the characteristics of these two methods, the basic configuration is that in the active matrix method, one substrate is a glass substrate, the other substrate is a silicon substrate, and a MOS transistor for pixel selection switching is installed for each pixel on the silicon substrate. , a pixel capacitor for auxiliary storage, and a pixel electrode are arranged in a matrix over the entire screen, and the gate electrode of each transistor.

The source electrode is connected to a drive circuit formed around the panel. On the other hand, in the time division method, a glass substrate on which scanning electrodes made of striped transparent electrodes are formed and a glass substrate on which signal electrodes are similarly formed are arranged so that the electrodes are perpendicular to each other through a liquid crystal, and each electrode is connected to the periphery. It has a structure in which it is connected to a circuit board formed in . The display area is limited by the size of the silicon substrate in the active matrix method, but can be made relatively large in the time division method. The number of electrodes taken out from the panel is active
In the matrix method, the scanning circuit and signal processing circuit can be built into the silicon substrate, so the number of electrodes taken out from the panel is small, but in the time division method, the number of electrodes taken out increases significantly as the number of pixels increases (i.e., the number of electrodes taken out increases significantly as the number of pixels increases). is n, n times the number of signal electrodes is required). The image quality of the active matrix method is better than that of the time-sharing method.In terms of manufacturing, the active matrix method requires the simultaneous formation of many elements on a silicon substrate, resulting in lower yields and higher costs, but the time-sharing method By constructing a cell using a glass substrate and transferring the completed device onto a separate substrate, yields can be improved and costs can be reduced.

Implementation of conventional time-sharing LCD panel module +7'
As shown in Fig.
1. A wire 1 and a wiring board 3 on which electronic components 2 for driving the signal side are mounted are bonded using a Filno wiring board 4, and a scanning side electrode 5 and an electronic component 6 for driving the scanning side are mounted. The wiring board 7 is soldered using a film wiring board 8. However, this type of soldering method has the following drawbacks.

(1) It is difficult to replace a liquid crystal display panel formed by filling the space between two glass substrates 9 and 10 with liquid crystal material 11. (2) It is necessary to form a parent metal on the terminal portion in advance.

(3) During soldering, the connection area becomes high temperature, but since there is a difference in elongation due to the difference in thermal expansion coefficient between the fill, wiring board, and glass, it is necessary to take this point into account when connecting.

(4) The number of connection points increases, leading to an increase in man-hours.

(5) A film wiring board with high density wiring is required, and such a film wiring board is expensive.

(6) Since the film wiring board is bent and mounted, wasted space is created.

(7) Since several wiring boards are required, it is difficult to reduce the thickness.

Of these, (1) to (5) are factors that increase costs, and (6) and (7) are major obstacles to making liquid crystal televisions smaller and thinner. As a means to overcome all of these drawbacks, Japanese Patent Application No. 157142/1983 proposed a liquid crystal display panel structure using a bent substrate and a nidistomer connection.

The present invention seeks to further improve this technology. That is, in the structure of a general liquid crystal panel, as shown in FIG. 2, the signal side electrode 1 and the scanning side electrode 5 are formed on glass substrates 9 and 10 which are arranged opposite each other so that they are perpendicular to each other. Electrode 1
．． 5 with a liquid crystal substance 11 interposed between them, and a sealing resin 12 surrounding the periphery.
It is sealed in. Therefore, the signal side electrode 1 and the scanning side electrode 5 are generally not on the same plane. This liquid crystal panel was manufactured in the above-mentioned patent application filed in 1983. When applied to a technique using elastomer connection as in No. 157142, the scanning side electrode 5 is transferred onto the signal side glass substrate 9 using a transfer material 13 such as conductive Ag paste, as shown in FIG. It is necessary to arrange it on the same plane as the signal side electrode 1. However, there are problems with this electrode transition.

. (1),,1. A large area is required on the glass, which hinders miniaturization.

(2) The increase in the number of transfer steps causes cost problems.

(3) Due to the difference in thermal expansion coefficient between the sealing resin 12 and the transition material 13. There is a problem that peeling occurs at the interface between the glass substrates 9 and 10 and the transition material 13, resulting in poor conduction and a decrease in reliability.

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned drawbacks, the present invention aims to provide a new and useful flat matrix display panel structure that utilizes the conventional panel structure as it is and makes full use of technical means in the folding form of the wiring board. .

Hereinafter, the present invention will be described in detail according to embodiments with reference to the drawings.

4 and 5 are configuration diagrams of a module structure of a liquid crystal display panel showing one embodiment of the present invention.

The wiring board 15 with bent edges is arranged on the back side of the liquid crystal panel I, and the connection between the signal side electrode 1 on the glass substrate 9 of the liquid crystal panel I and the fine pitch multi-terminals 9 of the wiring board 15 is made different as shown in FIG. This is done at the bent edges using conductive rubber (elastomer) 14.

On the other hand, the electrode terminal connection on the scanning side is performed by bending the edge of the wiring board 15 so as to face the scanning side electrode 5 on the upper surface of the scanning side glass substrate 10 and using the anisotropically conductive rubber 14 as shown in FIG. . Electronic components (driver ■C, etc.) 16 are attached to the four parts of this folded wiring board 15. In this case, it goes without saying that the configurations of the scanning-side glass substrate 10 and the signal-side glass substrate 9 may be reversed, but in the case of liquid crystal, the scanning-side electrode pitch is smaller than the signal-side electrode pinch. Since the electrodes are large, if the electrodes on the signal side are aligned, the electrodes on the scanning side can be aligned automatically, so this embodiment is more desirable.

Furthermore, although this embodiment has been described in detail with respect to a liquid crystal television, the present invention is not limited thereto, but can be applied to a game device.

It can be widely applied to liquid crystal dot matrix displays used in learning devices, plasma displays, EL displays, and other dot matrix panels. The difference in the above embodiment is that the wiring board 15 is made of MO (Metal-based Organc), which has a metal substrate as a base and has a multilayer wiring pattern formed thereon.
film) substrate was used.

According to the present invention, a conventional matrix panel that does not perform electrode transition can be used as a display panel, and therefore it is possible to achieve miniaturization, cost reduction, and improvement in reliability.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the mounting structure of a conventional liquid crystal panel module. FIG. 2 is a structural diagram of a conventional liquid crystal panel, and FIG. 3 is a structural diagram of a liquid crystal panel with electrode transition. 4 and 5 are configuration diagrams of a module structure of a liquid crystal display panel showing one embodiment of the present invention. 1... Signal side electrode, 4, 8... Film wiring board, 5...
...Scanning side electrode, 9, 10...Glass substrate, 11...
・Liquid crystal substance, 13...Transition material, 14...Anisotropic conductive rubber Agent Patent attorney Yoshihiko Fukushi (and 2 others) 10
J Figure 5

Claims (1)

[Claims] 1. Bend the wiring board to a position where the connection wiring of the wiring board on which the drive circuit is formed and each electrode line of the scanning side electrode and the signal side electrode of the flat matrix display panel face each other, and conduct anisotropic conductivity between each electrode. Construction of a flat matrix display panel characterized by forming electrical connections through rubber