JPS6238423A - Matrix display device - Google Patents

Abstract

PURPOSE:To suppress shorting due to electrostatic damage of X and Y wirings in a display screen and to improve sharply the yield of production by forming an electrostatic damage preventing wire on the periphery of the display screen. CONSTITUTION:The electrostatic damage preventing wire 7 is arranged among the display screen 4, the pads 5 of the X wires 1, 1' and the pads 6 of the Y wires 2. If the wire 7 is formed in the same process as the X wires 1, it is necessary to electrically insulate the X wires 1' from the wire 7, so that the wire 7 is formed in the same process as the Y wires 2. Thereby, contacts 8 are formed to connect the X wires 1, 1' electrically with the pads 5. Similarly, contacts 9 are formed to connect the Y wires electrically with the pads 6. Although the wire 7 is electrically one wire, the wire 7 may be branched to plural wires at respective crossing parts 10 with the X wires 1' and the Y wires 2 when required.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] This invention relates to prevention of electrostatic discharge damage in liquid crystal display devices using active switching elements.

[Summary of the invention]

This invention is a liquid crystal display device in which a ring-shaped electrostatic damage prevention area is provided around the display screen to prevent short circuits between the X wiring and the Y wiring due to electrostatic damage. be.

[Conventional technology]

Conventionally, as shown in FIG. 2, a liquid crystal matrix display device has an X wiring 1 electrically insulated from each other on one of two substrates (at least one of which is a transparent substrate) facing each other with a liquid crystal in between. and Y wiring 2 are configured in a matrix, and X wiring 1
This configuration has a pixel consisting of a two-pixel cell and an active switch element at the intersection 8 of the Y wiring 2 and the Y wiring 2.

[Problem that the invention seeks to solve]

When there are 240 X wirings 1 and 22 Y wirings 2, there are 52,800 intersections 8 in the two display screens 4 where the X wirings 1 and Y wirings 2 intersect with each other via a thin insulating film. By the way, X
If static electricity is applied between the pad 5 of the wiring 1 and the pad 6 of the Y wiring 2 by placing two human bodies together, the R film at the intersection 8 of 75≧ will be destroyed very easily. As a result, a portion of the X wiring 1 and the X wiring 2 are short-circuited. The liquid crystal display device in which such a short circuit occurred is one screen fc.
If the product is displayed, a cross-shaped black line defective sound is produced, indicating that the product is defective.

Therefore, in order to solve these conventional drawbacks, the present invention aims to prevent the impact caused by static electricity from affecting the intersections within the display screen.

[Means for solving problems]

In order to solve the above problems, this invention takes into account that 90% of the intersections that are destroyed by electrostatic discharge are concentrated at the outermost intersections, and a ring-shaped structure is installed between the display screen and the pad. In addition to forming all of the wiring for preventing electrostatic damage, intersections were also constructed outside the two display screens to reduce the possibility that the effects of static electricity would spread within the two display screens.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIG. 1, the X wiring 1 in 1 display screen 4 is 2, for example,
This is the upper layer wiring of aluminum.

The X wiring 2 is a lower layer wiring made of, for example, chrome.

Electrostatic damage prevention wiring 7 is arranged between one display screen 4, the pads 5 of the X wirings 1 and 1', and the pads 6 of the X wiring 2. Electrostatic breakdown prevention wiring 7f When formed in the same process as X wiring 1, X wiring 1' needs to be electrically insulated from electrostatic breakdown prevention wiring 7, so it is formed in the same process as X wiring 2. be done. Therefore, a contact 8 is provided to electrically connect the X wiring 1, the X wiring II, and the pad 5. Similarly, a contact 9 is provided to electrically connect the X wiring 2 and the pad 6. By the way, the electrostatic damage prevention wiring 7 is electrically one wiring, but if necessary The X wiring 11 and the X wiring 2 are separated into a plurality of wirings at each intersection 10. bad 11
By checking the electrical insulation between the pad 5 or the pad 6, the intersection 1 destroyed by static Ti can be detected.
This is for investigating the 0 digit R.

FIG. 8 is an overall configuration diagram of another embodiment of an IJ display device in which electrostatic countermeasures according to the present invention are taken. X wiring 1 and
The configuration of the wiring 2, pads 5, and 6 is similar to the overall configuration diagram of the conventional matrix display device shown in FIG. However, the electrostatic damage prevention wirings 7' and 71 are different from the overall configuration diagram of the matrix display device with electrostatic countermeasures shown in FIG. That is, the electrostatic damage prevention wiring 71 is formed in the same process as the X wiring, whereas the electrostatic damage prevention wiring 71 is formed in the same process as the X wiring.
71 is formed in the same process as the Y wiring. The contact 12 electrically connects the electrostatic damage prevention wiring 7τ and the electrostatic damage prevention wiring 71.

In the embodiment described above, since the electrostatic damage prevention wirings 7, 71, and 71 are present around the two display screens 4, the insulation of the intersection 8 of the X wirings 1 and II and the X wiring 2 due to electrostatic damage The probability of destruction is reduced by about 90 degrees. Most of the electrostatic damage occurs at the intersection 10 of the electrostatic damage prevention wirings 7, 71, and 76 and the X wiring 1 or the X wiring 2. What is the dielectric breakdown at intersection 1o? It's an electrical problem. However, after the final process, by cutting the electrostatic breakdown prevention wirings 7, 71, and 71 in the vicinity of the dielectric breakdown with a laser beam, etc., the electrostatic discharge prevention wirings 7, 71, and 71, and the X wirings 1 and II Or X wiring 2
and can improve electrical insulation.

no problem. A plurality of intersections 10t are provided for the electrostatic damage prevention wirings 7, 71, and 71μ, one X wiring 1 and 11, or one X wiring 2. This is to reduce the probability t' of electrostatic damage at the intersection 8 of the 4 circles on the thorny display screen. Also, as shown in Figure 1.

By forming the X wiring 11 and the X wiring 2t outside the display screen 4 using materials with relatively high resistance, the probability that the intersection 8 inside the display screen 4 will be damaged by electrostatic discharge is further reduced by 4t. can be done.

〔Effect of the invention〕

As explained above, this invention has a simple structure in which electrostatic damage prevention wiring is formed around one display screen to suppress short circuits due to electrostatic damage between the X wiring and Y wiring in two display screens, and This has the effect of greatly improving the manufacturing yield of display devices.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram of a matrix display device with electrostatic countermeasures according to the present invention, and FIG. 2 is a diagram of a conventional matrix display device.
FIG. 8 is a diagram showing the overall configuration of another embodiment of the matrix display device in which electrostatic countermeasures are taken according to the present invention. 1pl'**. ,! Wiring 20. . 00. . Y wiring 8, 10, . ,. Intersection 7.7', 7", wiring for preventing electrostatic damage Applicant: Seiko Electronics Co., Ltd. Temple 1 Electric pair summer and alms matrix table Overall inventory of the device Fig. 1 Conventional matoso 7 Figure 2

Claims (2)

[Claims] (1) In a matrix display device having matrix wiring in the X direction and the Y direction, the area around the display area between the pad portion of the matrix wiring and the display area is electrically insulated from the matrix wiring. A matrix display device characterized by having ring-shaped wiring. (2) The matrix display device according to claim 1, wherein the ring-shaped wiring is branched into a plurality of wirings at the intersection with the matrix wiring.