JPH08201835A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To provide a liquid crystal display device with high reliability by arranging a catch portion at the end of a metal plate to lock a wiring board. CONSTITUTION: For a liquid crystal display 14, a glass substrate 3 out of a pair of glass substrates 2, 3 pasted each other via liquid crystal and provided with display areas 4 and a wiring board 5a are arranged in parallel for both end faces to be opposed. The glass substrate 3 and the wiring board 5a are arranged on a metal plate 6, a catch portion 6a is provided at the end of the metal plate 6 to lock the wiring board 5a and a drive IC 8a is arranged on a non-display area 9 on the glass substrate 3 to make the terminal of the drive IC 8a electrically conductive to the terminal of the wiring board 5a with wire bonding 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device.

[0002]

7 to 9 show a conventional liquid crystal display device 1, FIG. 7 is a plan view thereof, and FIGS. 8 and 9 are enlarged plan views and enlarged sectional views of a region A shown in FIG. 5, respectively. 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 the inner surfaces of the liquid crystal display electrodes so as to be orthogonal to each other.
On the lower glass substrate 3, wiring boards 5 such as printed circuit boards are arranged side by side so that their end faces face each other, and the lower glass substrate 3 is placed on a metal plate 6 made of stainless steel or the like.
The wiring board 5 and the wiring board 5 are fixed by the adhesive resin 7. Further, the drive ICs 8 are arranged on the wiring substrate 5 and the lower glass substrate 3, 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 further on the wiring substrate 5. Bonding pad 11 is also formed. And
The terminal of the drive IC 8 is the bonding pad 1 of the output side wiring.
0 and each terminal of the bonding pad 11 are connected by wire bonding 12. Reference numeral 13 is a coordinate recognition marker for mounting an IC or for wire bonding to an IC terminal.

[0003]

However, in the liquid crystal display device 1 having the above structure, the wiring board 5 is inferior in flatness, so that the wiring board 5 is peeled off from the metal plate 6 and the wire bonding 12 is broken. There is a problem.

In addition, warping may occur on the entire lower glass substrate 3, wiring substrate 5 and metal plate 6, and the wire bonding 12 may also break.

Therefore, an object of the present invention is to prevent warping over the entire structure when a glass plate and a wiring board are arranged side by side so that their end faces face each other, but are supported by a metal plate. Another object of the present invention is to provide a liquid crystal display device capable of improving reliability by preventing the wiring board from being peeled off from the metal plate.

[0006]

In the liquid crystal display device of the present invention, one glass substrate of a pair of glass substrates having a display area bonded via liquid crystal and a wiring substrate are provided on both end faces. They are arranged side by side so that they face each other, and the one glass substrate and the wiring substrate are arranged on the metal plate, and a scratching portion for locking the wiring substrate is provided at the end of the metal plate. The driving IC is arranged on the non-display area of the glass substrate, and the terminals of the driving IC and the terminals on the wiring board are electrically conductive by wire bonding.

In another liquid crystal display device of the present invention, one of a pair of glass substrates having a display area bonded via liquid crystal and a wiring substrate are arranged so that their end faces face each other. And the one glass substrate and the wiring substrate are arranged on a metal plate, and a scratching portion for locking the wiring substrate is provided at the end of the metal plate, and the drive IC is mounted on the wiring substrate. The drive IC terminals and the terminals on the non-display area of the one glass substrate are electrically connected by wire bonding.

[0008]

In both of the present inventions, since the scratching portion for locking the wiring board is provided at the end of the metal plate, the wiring board is fixed to the metal plate by the scratching portion. The glass substrate, the wiring substrate, and the metal plate are prevented from warping over the entire surface, and further, the wiring substrate is prevented from peeling off from the metal plate. As a result, the wire bonding to the drive IC is not broken, and reliability is improved. Increase.

[0009]

EXAMPLES Examples of each invention will be described in detail below. (Example 1) FIGS. 1 to 3 show a liquid crystal display device 14 of the present invention. FIG. 1 is a plan view thereof, FIG. 2 is an enlarged plan view of a region B shown in FIG. 1, and FIG. It is a principal part sectional drawing of the apparatus 14. The same members as those of the conventional liquid crystal display device 1 are designated by the same reference numerals.

In the liquid crystal display device 14, a liquid crystal (not shown) is provided between the upper glass substrate 2 which is the common side glass substrate and the lower glass substrate 3 which is the segment side glass substrate by a sealant (not shown). And the display electrodes are arranged on the inner surfaces of the upper and lower glass substrates 2 and 3 so as to be orthogonal to each other to form a display region 4. On the lower glass substrate 3, wiring boards 5a and 5b such as printed boards are arranged side by side so that their end faces face each other, and stainless steel (SU
The lower glass substrate 3 and the wiring substrate 5a are taped (for example, N manufactured by Nitto Denko Corporation) on a metal plate 6 made of S) or the like.
o. 3161-F [black single-sided tape] and No. 5915
[Double-sided tape]), and fixed by interposing the black adhesive resin layer 7. A scratch section 6a having a concave cross section is provided at the end of the metal plate 6, and the wiring board 5a is inserted and locked in the scratch section 6a.

The wiring boards 5a and 5b have, for example, a multilayer wiring structure in which one or more wiring layers can be formed inside the board and / or a structure in which wiring layers are formed on both main surfaces. , 8b are wired with a bus line group having power and signal lines necessary for driving. Furthermore, if necessary, each system such as power supply and logic can be wired in layers,
Alternatively, various power supplies supplied from the outside and a signal processing circuit may be mounted.

Then, as shown in FIG. 1, a scanning drive IC
8a are arranged on the lower glass substrate 3, and a signal driving IC 8b
Are arranged on the wiring board 5b. Each drive IC 8a, 8
b is fixed on a glass substrate with an adhesive layer 15 made of an epoxy-silicone adhesive resin.

Further, the display electrode 4 is connected to the output side wiring 10 provided in the non-display area 9 of the lower glass substrate 3, and the input side wiring 11 is also formed on the wiring substrate 5a. Scan drive I
The terminal of C8a is connected to each terminal of the output side wiring 10 and the input side wiring 11 by a wire bonding 12 with an Au wire.

Thus, according to the above liquid crystal display device 14,
The wiring board 5a is locked to the scratched portion 6a of the metal plate 6, so that the lower glass substrate 3, the wiring board 5a, and the metal plate 6 are prevented from warping over the entire surface. The substrate 5a does not come off from the metal plate 6.

(Example 2) FIG. 4 shows a liquid crystal display device 16 of the present invention.
6 is a plan view thereof, FIG. 5 is an enlarged plan view of the area C shown in FIG. 1, and FIG. 3 is a liquid crystal display device 16.
FIG. The same members as those of the conventional liquid crystal display device 1 and the liquid crystal display device 14 of the present invention are designated by the same reference numerals.

In the liquid crystal display device 16 as well, the lower glass substrate 3 is provided with the wiring substrates 5a and 5b in parallel so that the end faces thereof face each other, and the lower glass substrate 3 is placed on the metal plate 6.
And the wiring board 5b are fixed with the black adhesive resin layer 7 interposed. Then, a scratching portion 6b having a concave cross section is provided at an end of the metal plate 6, and the wiring board 5b is inserted and locked in the scratching portion 6b.

Further, as shown in FIG. 4, a scanning drive IC 8
a is arranged on the lower glass substrate 3, and the signal driving ICs 8b are arranged on the wiring substrate 5b. Each drive IC 8a, 8b
Is fixed on a glass substrate with an adhesive layer 15 made of an adhesive resin of silicon-epoxy.

Furthermore, the display electrode 4 is connected to the output side wiring 10 provided in the non-display area 9 of the lower glass substrate 3, and the input side wiring 11 is further formed on the wiring substrate 5b. The terminals of the signal driving IC 8b are the output side wiring 10 and the input side wiring 1.
Wire bonding with Au wire to each terminal of 1
Connected by two.

Thus, also in the liquid crystal display device 16, the wiring board 5 is provided on the scratched portion 6b of the metal plate 6.
b, so that the lower glass substrate 3 and the wiring substrate 5
b and the metal plate 6 are prevented from warping over the entire surface, and the wiring board 5b is prevented from peeling off from the metal plate 6.

The present invention is not limited to the above embodiments, and various changes and improvements may be made without departing from the scope of the present invention.

[0021]

As described above, according to the liquid crystal display device of the present invention, since the scratched portion for locking the wiring board is provided at the end of the metal plate, the wiring board is held by the scratched portion. Is fixed to the metal plate, so that the glass substrate, the wiring substrate, and the metal plate do not warp over the entire surface, and the wiring substrate does not peel off from the metal plate, which leads to wire bonding to the drive IC. The disconnection does not occur, and as a result, a highly reliable liquid crystal display device can be provided.

[Brief description of drawings]

FIG. 1 is a plan view of a liquid crystal display device of an example.

FIG. 2 is an enlarged view of a main part of the liquid crystal display device according to the embodiment.

FIG. 3 is an enlarged cross-sectional view of a main part of the liquid crystal display device of the example.

FIG. 4 is a plan view of a liquid crystal display device according to another embodiment.

FIG. 5 is an enlarged view of a main part of a liquid crystal display device according to another embodiment.

FIG. 6 is an enlarged cross-sectional view of a main part of a liquid crystal display device of another embodiment.

FIG. 7 is a plan view of a conventional liquid crystal display device.

FIG. 8 is an enlarged view of a main part of a conventional liquid crystal display device.

FIG. 9 is an enlarged cross-sectional view of a main part of a conventional liquid crystal display device.

[Description of sign]

 2 Upper glass substrate 3 Lower glass substrate 4 Display area 5a, 5b Wiring board 6 Metal plate 6a, 6b Scratch portion 8a, 8b Driving IC 15 Adhesive layer 9 Non-display area 10 Output side wiring 11 Input side wiring 12 Wire bonding

Claims (2)

[Claims] 1. A glass substrate, which is one of a pair of glass substrates having a display region bonded via liquid crystal,
The wiring board and the wiring board are arranged side by side so that their end surfaces face each other, the one glass substrate and the wiring board are arranged on a metal plate, and the wiring board is locked at the end of the metal plate. A liquid crystal display device in which a scratching portion is provided, a drive IC is arranged on a non-display area of the one glass substrate, and a terminal of the drive IC and a terminal on a wiring board are electrically conductive by wire bonding. 2. One glass substrate of a pair of glass substrates having a display area bonded via liquid crystal,
The wiring board and the wiring board are arranged side by side so that their end surfaces face each other, the one glass substrate and the wiring board are arranged on a metal plate, and the wiring board is locked at the end of the metal plate. A liquid crystal display device in which a scraping portion is provided, a drive IC is arranged on the wiring board, and the terminals of the drive IC and the terminals on the non-display area of the one glass substrate are electrically conductive by wire bonding.