JPH0660980B2 - Matrix display - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to prevention of electrostatic breakdown of a liquid crystal matrix display device using active and switch elements.

[Outline of Invention]

According to the present invention, in a liquid crystal matrix display device, a ring-shaped electrostatic breakdown prevention region is provided around the display screen, so that a short circuit between the X wiring and the Y wiring due to electrostatic breakdown can be prevented.

[Conventional technology]

2. Description of the Related Art 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) opposed to each other through a liquid crystal. And the Y wiring 2 are arranged in a matrix, and the pixel electrodes and the active. This is a configuration having a pixel composed of a switch element.

[Problems to be solved by the invention]

When the number of X wirings 1 is 240 and the number of Y wirings 2 is 220, an intersection 3 where the X wirings 1 and the Y wirings 2 intersect with each other through a thin insulating film.
Are present in the display screen 4. by the way,
If static electricity is applied between the pad 5 of the X-wiring 1 and the pad 6 of the Y-wiring 2 by a human body or the like, the insulating films at some intersections 3 are very easily destroyed. As a result, a part of the X wiring 1 and the Y wiring 2 is short-circuited. The liquid crystal matrix display device in which such a short circuit occurs is a defective product because a cross-shaped black line defect occurs when the screen is displayed.

Therefore, the present invention has an object to solve the above-mentioned conventional drawbacks so that the impact due to static electricity does not affect the intersection in the display screen.

[Means for solving problems]

In order to solve the above problems, the present invention focuses on that 90% of electrostatically destroyed intersections are concentrated in the outermost intersections, and a ring-shaped static gap is provided between the display screen and the pad. By forming a wiring for preventing electric breakdown, an intersection is formed outside the display screen to reduce the possibility that the influence of static electricity will spread to the inside of the display screen.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.
In FIG. 1, the X wiring 1 in the display screen 4 is, for example,
The upper layer wiring of aluminum, the Y wiring 2 is, for example,
This is the lower layer wiring of chrome. An electrostatic breakdown preventing wiring 7 is arranged between the display screen 4, the pad 5 of the X wirings 1 and 1 ', and the pad 6 of the Y wirings 2. When the electrostatic breakdown prevention wiring 7 is formed in the same process as the X wiring 1, the X wiring 1'needs to be electrically insulated from the electrostatic breakdown prevention wiring 7, so that the same process as the Y wiring 2 is performed. Is formed by. Therefore, a contact 8 is provided to electrically connect the X wiring 1, the X wiring 1 ′ and the pad 5. Similarly, Y
A contact 9 is provided to electrically connect the wiring 2 and the pad 6 to each other. By the way, the electrostatic breakdown prevention wiring 7
Is electrically one wiring, but is separated into a plurality of wirings at each intersection 10 of the X wiring 1 ′ and the Y wiring 2 if necessary. The pad 11 is for investigating the position of the intersection 10 destroyed by static electricity by confirming the electrical insulation between the pad 5 and the pad 6.

FIG. 3 is an overall configuration diagram of another embodiment of the matrix display device having the countermeasure against static electricity according to the present invention. The configurations of the X wiring 1, the Y wiring 2, the pad 5 and the pad 6 are the same as those of the conventional matrix display device shown in FIG. However,
The electrostatic breakdown preventing wirings 7'and 7 "are different from the overall configuration diagram of the matrix display device provided with the electrostatic countermeasures in Fig. 1. That is, the electrostatic breakdown preventing wiring 7'is the same as the X wiring. Wiring 7 ″ to prevent electrostatic damage, although formed in the same process
Are formed in the same process as the Y wiring. Contact 1
Reference numeral 2 electrically connects the electrostatic breakdown preventing wiring 7'and the electrostatic breakdown preventing wiring 7 ".

In the above embodiment, since the electrostatic breakdown preventing wirings 7, 7'and 7 "are present around the display screen 4, the intersections of the X wirings 1 and 1'and the Y wiring 2 due to electrostatic breakdown are present. The probability of the dielectric breakdown of No. 3 is reduced by about 90%, and most of the electrostatic breakdown occurs at the intersection 10 of the electrostatic breakdown preventing wirings 7 and 7'and 7 "and the X wiring 1 or the Y wiring 2. . Dielectric breakdown of the intersection 10 is an electrical problem. However, after the final step, the electrostatic breakdown preventing wirings 7 and 7 ′ and 7 ″ in the vicinity of the dielectric breakdown are cut off by a laser beam or the like, so that the electrostatic breakdown preventing wirings 7 and 7 ′ and 7 ″ and X Wiring 1 and 1'or Y wiring 2
Since the electrical insulation can be restored, there is no problem. The electrostatic breakdown preventing wirings 7, 7'and 7 "have a plurality of intersections 10 with respect to one X wiring 1 and 1'or one Y wiring 2. This is a display. This is to reduce the probability of electrostatic breakdown at the intersection 3 in the screen 4. Also, as shown in Fig. 1, the X wiring 1'and the Y wiring 2 on the outside of the display screen 4 have a comparatively low resistance value. By using a material having high conductivity, the probability that the intersection 3 in the display screen 4 is electrostatically destroyed can be further reduced.

〔The invention's effect〕

As described above, the present invention has a simple structure in which the wiring for preventing electrostatic breakdown is formed around the display screen, and the short circuit due to the electrostatic breakdown of the X wiring and the Y wiring in the display screen is suppressed, and the matrix is formed. This has the effect of greatly improving the manufacturing yield of the display device.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a matrix display device provided with an antistatic measure according to the present invention, FIG. 2 is an overall configuration diagram of a conventional matrix display device, and FIG. 3 is an antistatic measure according to the present invention. FIG. 9 is an overall configuration diagram of another embodiment of a matrix display device that has been subjected to the above. 1, 1 '... X wiring 2 ... Y wiring 3, 10 ... Intersection 7, 7', 7 "... Electrostatic breakdown prevention wiring

Claims (2)

[Claims] 1. A matrix display device having matrix wirings in the X direction and the Y direction, wherein a periphery of the display area between a pad portion of the matrix wirings and a display area is provided.
A matrix display device, characterized in that an electrically insulated ring-shaped wiring is provided for the matrix wiring. 2. The matrix display device according to claim 1, wherein the ring-shaped wiring has a shape branched into a plurality of wirings at an intersection with the matrix wiring.