JPH0954329A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a liquid crystal display device capable of lowering connection resistance and preventing the driving power supply voltage drop of an integrated circuit driver by increasing the connection area of a liquid crystal cell and the terminals of a TAB tape. SOLUTION: The plural driving power source terminals 25 of the integrated circuit driver of a tape carrier 21 for supplying a switching control signal to the liquid crystal cell are adjacently arranged and the driving power source terminals 32 which are formed on the extension part 12a of the substrate formed at the outer edge of the liquid crystal cell 10 and supply the driving power source to the integrated circuit driver are connected across the plural driving power source terminals 25 in the case of packaging the integrated circuit driver 20 on the tape carrier 21 into the extension part of the substrate described above.

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, and more particularly to a mounting structure for an integrated circuit driver of a matrix type liquid crystal display device.

[0002]

2. Description of the Related Art Matrix type liquid crystal display devices are classified into a simple matrix type and an active matrix type, and both have a liquid crystal cell and an integrated circuit driver (LSI) which supplies a switching control signal to the liquid crystal cell. The liquid crystal cell has electrodes arranged in a matrix on the inner surface of a transparent substrate that closely faces each other, and liquid crystal that is sealed between the transparent substrates that closely face each other.
It is composed of a film having a polarizing property, which is arranged on the outer surface of the transparent substrate as necessary. Further, as shown in FIG. 4, the liquid crystal cell is
At least the transparent substrates are closely opposed to each other only within the display range, and the terminal 3 for connecting the integrated circuit driver by drawing the wiring from the electrode is provided in the substrate extension 2 at the outer edge of the cell sealing portion where the transparent substrates do not overlap each other. Further, the board extension portion 2 is provided with a wiring 4 for supplying a control signal of the integrated circuit driver and a driving power source, and a connection terminal 5 for connecting with the integrated circuit driver.

As shown in FIG. 5, the method for joining the liquid crystal cell 1 and the integrated circuit driver is such that the liquid crystal cell control signal output terminal 6a, the integrated circuit driver control signal input terminal 6b and the driving power input terminal 6c of the integrated circuit driver 6 are connected. First, a TAB (Tape Automated Bondi) that is connected to a copper foil wired on a polyimide film and is output to the outside
ng) tape carrier 7. An OL for connecting the liquid crystal cell control signal output terminal 7a, the integrated circuit driver control signal input terminal 7b, and the driving power supply input terminal 7c to a terminal of an extension portion on the liquid crystal cell with a resin containing conductive particles.
The B method (Outer Lead Bonding) is used.

Conventionally, when a switching control signal is supplied to a liquid crystal cell using TAB, the input / output terminal 7a of TAB is used.
7c are input / output terminals 6a to 6 of the integrated circuit driver, respectively.
In addition, the terminal 5 of the substrate extension 2 of the liquid crystal cell has the same shape as the input / output terminal of the TAB.

[0005]

When the integrated circuit driver driving power is supplied from the wiring on the liquid crystal cell to the integrated circuit driver in the above configuration, the connection resistance between the terminal on the liquid crystal cell and the TAB wiring is on the liquid crystal cell. Increased due to the misalignment between the terminals of and the wiring on the TAB, the voltage drop of the integrated circuit driver driving power source occurred, and the malfunction of the integrated circuit driver often occurred. For this reason, it is conceivable to widen the width of the terminals and the mutual gap, but it is not possible to provide a sufficient width margin within a limited substrate or tape area.

The present invention solves such a problem, and increases the connection area between the liquid crystal cell and the terminal of the TAB tape to reduce the connection resistance, thereby preventing the driving power supply voltage drop of the integrated circuit driver. You get the device.

[0007]

The present invention provides at least the following:
From a liquid crystal cell having electrodes arranged in a matrix on a substrate and an integrated circuit driver mounted on a tape carrier which is arranged on a substrate extension portion of the substrate formed on an outer edge of the liquid crystal cell and supplies a switching control signal to the electrodes. In the liquid crystal display device in which the control signal input and the driving power input of the integrated circuit driver are supplied by the wiring on the substrate extension, a plurality of driving power input terminals of the integrated circuit driver of the tape carrier are arranged adjacent to each other. A liquid crystal display device is provided in which a driving power supply terminal for supplying the driving power, which is formed on the substrate extension, is connected to a plurality of driving power supply input terminals of an integrated circuit driver of the tape carrier. .

The connection between the liquid crystal cell and the integrated circuit driver is
The liquid crystal cell control signal output terminal of the integrated circuit driver, the integrated circuit driver control signal input terminal, the drive power input terminal is first connected to the copper foil wired on the polyimide film and output to the outside. Switching of the liquid crystal cell on the TAB tape The control signal output terminal, the integrated circuit driver control signal input terminal, and the drive power supply input terminal are wired, and these terminals are connected to the terminals of the substrate extension of the liquid crystal cell with a resin containing conductive particles. In this case, a plurality of TAB wirings of the driving power source of the integrated circuit driver on the TAB are provided for the terminals of the integrated circuit driver to form a plurality of adjacent driving power terminals on the tape, and the integrated circuit driver driving is provided in the substrate extension portion of the liquid crystal cell. The power supply terminals are arranged so as to extend over a plurality of drive power supply input terminals of the same drive power supply of the integrated circuit driver on the TAB tape.

According to the present invention, therefore, the TAB is connected to the liquid crystal cell by the OLB method, the liquid crystal cell switching control signal is supplied from the integrated circuit driver to the liquid crystal cell, and the integrated circuit driver control signal is supplied to the integrated circuit driver from the wiring on the liquid crystal cell. , Supply drive power.

With the above structure, when the wiring on the TAB tape on which the integrated circuit driver is mounted and the terminal on the liquid crystal cell are connected, it is possible to prevent the connection area from being reduced due to the misalignment of the terminal of the TAB wiring and the liquid crystal cell terminal. Further, the connection resistance between the TAB wiring and the liquid crystal cell upper terminal can be reduced to reduce the voltage drop of the integrated circuit driver driving power supply and prevent the malfunction of the integrated circuit driver.

[0011]

1 to 3 show an embodiment of the present invention. As shown in FIG. 1, a liquid crystal cell 10 has electrodes on a pair of glass substrates 11 and 12 facing each other. 1
3 and 14 are opposed to each other, a twisted nematic liquid crystal 15 is enclosed between them, and polarizing plates 16 and 17 are provided on the outer surface of the substrate.

In a liquid crystal cell using a TFT (thin film transistor) as a switching element, a flat electrode is used as the electrode 13 of the upper substrate 11 and an electrode 14 of the lower substrate 12 is used as a plurality of pixel electrodes in a matrix arrangement, and a TFT 14a is provided for each pixel electrode. ing. The lower substrate 12 is larger than the area of the upper substrate 11 and protrudes from the outer edge 10a of the sealing portion of the liquid crystal cell 10, and particularly in FIG.
As shown in, the electrode 1 is attached to the protruding substrate extension 12a.
The lead wires 18 of 3 and 14 are drawn out to form a control signal terminal 19 on the cell side.

The integrated circuit driver 20 is formed of an LSI and applies a control signal to the electrodes of the liquid crystal cell, and is arranged on the substrate extension 12a of the liquid crystal cell as shown in FIGS. LSI that constitutes these drivers 20
Is typically a semiconductor chip mounted on a tape carrier 21 by TAB and connected to a TAB wiring 22.
The terminals 23, 24, 25 are formed on the extension of the B wiring.
These terminals are a switching control signal output terminal 23, an integrated circuit driver control signal input terminal 24, and a driver driving power supply input terminal 25.

A plurality of TABs are connected to the power supply terminals of one LSI.
Wirings 22a are formed, and these plural TAB wirings are formed in parallel on the tape carrier 21 as a plurality of adjacent driver driving power supply terminals 25.

As shown in FIG. 2, a control signal and power supply wiring 30 for a driver connected to an external circuit (not shown) is formed on the substrate extension 12a of the liquid crystal cell 10, and these terminals are the driver. The control signal terminal 31 and the driving power supply terminal 32 are formed in parallel with the control signal terminal 19 in a line. As shown, the terminals 2 of the tape carrier 21 are placed on these parallel terminal groups 19, 31, 32.
3, 24 and 25 are superposed and connected by the OLB method with a resin containing conductive particles.

Power supply terminal 32 on the board extension 12a
Has a wide drive power input terminal 25 for the driver on the tape carrier 21, and therefore, one power supply terminal 32 is connected to a plurality of drive power sources on the tape carrier 21 at the time of connection. It is connected so as to straddle the input terminal 25.

As a result, the connection area between the terminals 25 and 32 is increased at the time of bonding with the resin containing the conductive particles, the connection resistance can be surely reduced, the voltage drop of the integrated circuit driver driving power source is prevented, and the integrated circuit driver Malfunctions can be prevented.

Further, instead of widening the power supply terminal, a plurality of terminals having the same width as other terminals can be arranged in parallel.

Although the embodiment of the present invention has been described with respect to the active matrix type liquid crystal display device having the TFT switching element, it goes without saying that it can be similarly applied to a device with a two-terminal MIM element or a simple matrix type device. Nor.

[0020]

According to the present invention, the connection resistance between the terminal on the tape on which the integrated circuit driver is mounted and the terminal on the liquid crystal cell is reduced, the voltage drop of the integrated circuit driver driving power supply is prevented, and the malfunction of the integrated circuit driver is prevented. Can be lost,
It is possible to improve the quality of the liquid crystal display device.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is a perspective view, FIG.

2 is a partially enlarged perspective view illustrating a connection between a terminal of a board extension portion of FIG. 1 and a terminal of a tape;

FIG. 3 is a partially enlarged perspective view illustrating the configuration of the tape of FIG.

FIG. 4 is a partially enlarged perspective view illustrating a connection between a terminal of a board extension portion of a conventional device and a terminal of a tape;

5 is a partially enlarged perspective view illustrating the configuration of the tape of FIG.

[Explanation of symbols]

 10: Liquid crystal cell 10a: Outer edges 11, 12: Substrate 12a: Substrate extension 13, 14: Electrode 15: Liquid crystal 18: Lead wire 19: Control signal terminal 20 Integrated circuit driver 21: Tape carrier 22: TAB wiring 23: Switching control Signal output terminal 24: Integrated circuit driver control signal input terminal 25: Drive power input terminal 30 Power supply wiring 31: Driver control signal terminal 32: Driver drive power supply terminal

Claims (1)

[Claims] 1. A tape carrier for providing a switching control signal to at least a liquid crystal cell having electrodes arranged in a matrix on a substrate and a substrate extension portion of the substrate formed at an outer edge of the liquid crystal cell. In a liquid crystal display device comprising an integrated circuit driver mounted and supplying switching control signal input and driving power input of this integrated circuit driver through wiring on the extension of the substrate, driving power input of the integrated circuit driver of the tape carrier. A plurality of terminals are arranged adjacent to each other, and a drive power supply terminal for supplying the drive power, which is formed in the substrate extension portion, is connected to the plurality of drive power supply input terminals of the integrated circuit driver of the tape carrier. Liquid crystal display device.