JPH10123554A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a resin layer protecting a driving IC from peeling. SOLUTION: A lower glass substrate 3 between a pair of glass substrates having a display area stuck to each other through a liquid crystal and a wiring substrate 5 are arranged side by side so that both end surfaces are confronted with each other. A transparent conductive film constituting the display area is conducted with output side wiring 10 arranged on the non-display area of the lower glass substrate 3, and the driving IC 8 is arranged on the non-display area of the lower glass substrate 3 or the wiring substrate 5, and further, a dummy pattern 14 is formed on the non-display area of the lower glass substrate 3 or the wiring substrate 5 by the same material as the transparent conductive film or the output side wiring 10, and these driving IC 8 and dummy pattern 14 are covered by the resin layer 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a liquid crystal display device.

[0002]

2. Description of the Related Art FIGS. 4 to 6 show a conventional liquid crystal display device 1. FIG. 4 is a plan view thereof, and FIGS. 5 and 6 are enlarged plan views and enlarged sectional views of an area A shown in FIG. It is. In the liquid crystal display device 1, liquid crystal is sealed between the upper glass substrate 2 and the lower glass substrate 3, and display electrodes 4 are arranged on each inner surface of the liquid crystal display device 4 so as to be orthogonal to each other to form a display area 4.
A wiring board 5 such as a printed board made of FR-4 material is juxtaposed on the lower glass substrate 3 so that respective end faces thereof face each other, and the lower glass substrate 3 is connected to a metal plate 6 made of stainless steel or the like. Resin 7 for bonding to substrate 5
It is fixed by. Further, the drive ICs 8 are arranged on the wiring substrate 5 and the lower glass substrate 3, and the display electrodes 4 are connected to the output-side wirings 10 provided in the non-display area 9 of the lower glass substrate 3, and are further provided on the wiring substrate 5. The bonding pad 11 is also formed. The terminals of the drive IC 8 are connected to the terminals of the bonding pads 10 and 11 of the output-side wiring by wire bonding 12. Reference numeral 13 denotes the driving IC 8 and the output side wiring 1
A resin layer made of an epoxy-based material for protecting the bonding pad 11 and the wire bonding 12.

[0003]

However, according to the liquid crystal display device 1 having the above structure, the resin layer 13 is easily peeled off between the lower glass substrate 3 and the wiring substrate 5 because the two substrates have different thermal expansion coefficients. There is a problem that the resin layer 13
The resin layer 13 is remarkably peeled off on the lower glass substrate 3 side having a small adhesive force with the resin layer 13. Incidentally, the thermal expansion coefficient of the lower glass substrate 3 is 8 × 10 ⁻⁶ / ° C., and the thermal expansion coefficient of the wiring substrate 5 is 15 to 18 × 10 ⁻⁶ / ° C.

To solve this problem, a wiring board 5
In order to make the thermal expansion coefficient of the lower glass substrate 3 close to that of the lower glass substrate 3, it has been proposed to form the wiring board 5 with a material having a small thermal expansion coefficient. However, there is a problem that the cost is increased.

Accordingly, an object of the present invention is to provide a highly reliable liquid crystal display device in which the resin layer does not peel even when a conventional wiring board made of a low-cost material is used.

[0006]

According to a liquid crystal display device of the present invention, one of a pair of glass substrates having a display region bonded through a liquid crystal and a wiring substrate are connected to each other by connecting end faces of both of them. Are arranged in parallel so as to face each other, and the transparent conductive film constituting the display area is made conductive with the metal film disposed in the non-display area of one glass substrate, and is formed on the non-display area of one glass substrate or on the wiring board. And a dummy pattern is formed on the non-display area of one of the glass substrates or on the wiring substrate using the same material as the transparent conductive film or the metal film, and the drive IC and the dummy pattern are covered with a resin layer. It is characterized by having.

[0007]

FIG. 1 is a block diagram showing an embodiment of the present invention.
3 will be described in detail. FIG. 1 shows a liquid crystal display device 1 according to the present invention.
2 is an enlarged plan view of a region B shown in FIG. 1, and FIG. 3 is a cross-sectional view of a principal part taken along line XX in FIG. 2. Note that the same members as those of the conventional liquid crystal display device 1 are denoted by the same reference numerals.

In the liquid crystal display device 1a, a liquid crystal (not shown) is provided between an upper glass substrate 2 which is a common side glass substrate and a lower glass substrate 3 which is a segment side glass substrate by a sealant (not shown). And the transparent conductive films are arranged on the inner surfaces of the upper and lower glass substrates 2 and 3 so as to be orthogonal to each other, thereby forming a display region 4. A wiring board 5 such as a printed board is juxtaposed on the lower glass substrate 3 which is one of the glass substrates so that the end faces thereof are opposed to each other. 3 and the wiring board 5 are taped (for example, No. 3161- manufactured by Nitto Denko Corporation).
F [black one-sided tape] and No. 5915 [double-sided tape]) and fixed with the black adhesive resin layer 7 interposed therebetween.

The wiring board 5 has, for example, 1 inside the board.
A multi-layer wiring structure capable of forming one or more wiring layers and / or a structure in which wiring layers are formed on both main surfaces, and a bus line group having a power supply and a signal line necessary for driving the driving IC 8; Wired. Power supply as needed,
Each system such as a logic may be wired for each layer, or a circuit for processing various power supplies and signals supplied from the outside may be mounted.

The transparent conductive film in the display area 4 is connected to the output wiring 10 as the metal film provided in the non-display area 9 of the lower glass substrate 3. Further, an input-side wiring 11 is formed on the wiring board 5, and the terminal of the scanning driving IC 8 is Al.
The terminals of the output-side wiring 10 and the input-side wiring 11 are connected by a wire bonding 12 with an Au wire.

The output side wiring 10 and the input side wiring 11 are provided by a thin film forming technique such as vacuum deposition or sputtering, and at the same time as the formation thereof, the non-display area 9 of the lower glass substrate 3 or the wiring board 5 is formed. Then, dummy patterns 14 each made of the same material were formed. The dummy pattern 14 is preferably provided near the non-display area 9 and the periphery of the wiring board 5, and the pattern shape is more complicated and the surface area is preferably increased.

Further, the driving IC 8, the output wiring 10, the bonding pad 11, and the wire bonding 12
For protection, a hatched area in the figure is covered with a resin layer 13 made of epoxy or the like.

Thus, according to the liquid crystal display device 1a having the above structure, since the dummy pattern 14 is provided near the non-display area 9 and the periphery of the wiring board 5, the adhesive area of the resin layer 13 is increased due to the uneven shape. Dummy pattern 1
Since 4 tries to lock a part of the resin layer 13, peeling of the resin layer 13 is prevented.

It should be noted that the present invention is not limited to the above embodiment, and various changes and improvements may be made without departing from the scope of the present invention. For example, although the dummy pattern 14 is provided together with the formation of the output-side wiring 10 and the input-side wiring 11, the dummy pattern 14 may be formed of a transparent conductive film at the same time when the display region 4 is formed instead.

[0015]

As described above, according to the liquid crystal display device of the present invention, a non-display region of one of a pair of glass substrates having a display region bonded through a liquid crystal or a wiring substrate. A dummy pattern is formed of the same material as the transparent conductive film forming the display area or the metal film for signal input provided in the non-display area of one of the glass substrates. By this, the adhesion of the resin layer to the substrate is improved by the contribution of the dummy pattern,
A highly reliable liquid crystal display device without peeling of the resin layer could be provided.

[Brief description of the drawings]

FIG. 1 is a plan view of a liquid crystal display device of the present invention.

FIG. 2 is an enlarged view of a main part of the liquid crystal display device of the present invention.

FIG. 3 is an enlarged sectional view of a main part of the liquid crystal display device of the present invention.

FIG. 4 is a plan view of a conventional liquid crystal display device.

FIG. 5 is an enlarged view of a main part of a conventional liquid crystal display device.

FIG. 6 is an enlarged sectional view of a main part of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 1a Liquid crystal display device 2 Upper glass substrate 3 Lower glass substrate 4 Display area 5 Wiring board 6 Metal plate 8 Drive IC 9 Non-display area of lower glass substrate 10 Output side wiring 11, 12 Bonding pad 13 Resin layer 14 Dummy pattern

Claims (1)

[Claims] A first glass substrate having a display region bonded through a liquid crystal;
The wiring substrate is arranged side by side so that both end faces thereof are opposed to each other, and the transparent conductive film constituting the display region is made to conduct with the metal film disposed in the non-display region of one glass substrate, Drive IC on non-display area of substrate or on wiring substrate
Wherein a dummy pattern is formed on the non-display area of the one glass substrate or on the wiring substrate using the same material as the transparent conductive film or the metal film, and the driving IC and the dummy pattern are formed by a resin layer. A liquid crystal display device characterized by being coated.