KR20080067535A - Ground structure of liquid crystal display apparatus - Google Patents

Abstract

A grounding structure in an LCD(Liquid Crystal Display) is provided to protect an LCD from abrupt electrostatic discharge effectively by forming a lightning rod-type grounding structure close to a common voltage supply line at a flexible substrate in order to absorb and release the surge voltage due to electrostatic discharge which flows to the common voltage supply line. A grounding structure in an LCD comprises a liquid crystal panel(11), a flexible substrate(30), and one or more ground terminals(32). The liquid crystal panel is connected through gate signal lines(12), data signal lines(13), and common voltage lines(14). The flexible substrate comprises various signal lines and a common voltage supply line which is connected with the gate signal lines, data signal lines, and common voltage lines of the liquid crystal panel. The ground terminals, formed at the flexible substrate, absorb the surge voltage due to electrostatic discharge which flows to the common voltage supply line.

Description

Ground structure of liquid crystal display apparatus

1 is a diagram illustrating a ground structure of a liquid crystal display according to an exemplary embodiment of the present invention.

FIG. 2 is a detailed view illustrating a ground structure provided in the flexible substrate of FIG. 1. FIG.

<Explanation of symbols for main parts of the drawings>

11 liquid crystal panel 12 gate signal line

13 data signal line 14 common voltage line

21: driver IC 30: flexible substrate

31: connecting portion 34: main portion

31a: common voltage supply line 32: ground terminal

35 control IC

The present invention relates to a display device.

BACKGROUND ART In flat panel displays, the demand for liquid crystal displays (LCDs), which are smaller and lighter, and whose performance has been improved, is increasing explosively, with the recent development of semiconductor technology. This liquid crystal display has been attracting attention as an alternative means of overcoming the disadvantages of the conventional cathode ray tube (CRT) because of its advantages of miniaturization, light weight, and low power consumption. It is installed and used in information processing equipment such as all portable terminals.

Surge voltage rapidly applied to the portable terminal from the outside causes a malfunction of the device, and often causes damage to devices such as semiconductors. Sudden electrostatic discharge is most frequently applied among the surge voltages rapidly applied from the outside described above.

When the above-mentioned electrostatic discharge flows into the liquid crystal display of the portable terminal, it reacts most sensitively and causes distortion of the screen. For this reason, the portable terminal performs an endurance test for electrostatic discharge, which is called an electrostatic discharge (ESD) test.

In addition, when an electrostatic discharge occurs in the liquid crystal display of the portable terminal, surge voltage cannot be emitted to the outside, thereby preventing malfunction or damage of the control IC of the LCD panel, etc., from electrostatic discharge of the portable terminal itself. It does not have a problem.

The present invention provides a grounding structure of a liquid crystal display.

In addition, the present invention provides a grounding structure of a liquid crystal display device in which a ground terminal absorbs a surge voltage caused by an electrostatic discharge to a common voltage application line.

The present invention provides a grounding structure of a liquid crystal display device capable of providing a flexible substrate having a lightning rod-shaped ground terminal on one side of a common voltage application line.

A grounding structure of a liquid crystal display according to an exemplary embodiment of the present invention includes a liquid crystal panel connected to a gate signal line, a data signal line, and a common voltage line; A flexible substrate having various signal lines and common voltage application lines connected to gates, data signal lines, and common voltage lines of the liquid crystal panel; And at least one ground terminal formed on the flexible substrate and absorbing a surge voltage by an electrostatic discharge flowing through the common voltage applying line.

Hereinafter, a ground structure of a liquid crystal display according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a view for explaining a grounding structure of a liquid crystal display according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the liquid crystal display device includes a liquid crystal panel 11, a gate signal line 12, a data signal line 13, a common voltage line 14, a driver IC 21, and the driver IC 21. The control IC 35 is attached to be connected to each signal line via a flexible substrate 30 having a ground terminal 32.

The liquid crystal panel 11 includes liquid crystals in a region where the gate signal lines 12 and the data signal lines 13 cross each other and the gate signal lines 12 and the data signal lines 13 cross each other. The cells are located. The common voltage line 14 is arranged parallel to the gate signal line 12.

The liquid crystal panel 11 is provided with pixel electrodes and a common electrode for applying an electric field to each of the liquid crystal cells. Each of the pixel electrodes is connected to any one of the data signal lines 13 via source and drain terminals of the thin film transistor TFT which is a switching element. The gate terminal of the thin film transistor is connected to any one of the gate signal lines 12 to allow the pixel voltage signal to be applied to the pixel electrodes of one line. The gate signals at this time are sequentially supplied to the gate signal lines to sequentially drive the liquid crystal cells on the liquid crystal panel by one line.

The driver IC 21 supplies the pixel data signal along with driving control of the gate signal lines 12 and the data signal lines 13. In addition, the driving power such as the common voltage Vcom, the gate high voltage, and the gate low voltage required in the liquid crystal display is transferred to the voltage supply line 14 using the input power.

The driver IC 21 is mounted on a lower glass of the liquid crystal panel 11 in a chip on glass (COG) manner, and interfaces with the flexible substrate 30 from the control IC 35 to supply control signals and driving voltages. Will receive.

The flexible substrate 30 is divided into a connection part 31 for connecting to the liquid crystal panel and a main part 34 in which chips for driving control of the entire LCD module are mounted, and the connection part 31 is a liquid crystal panel 11. It is mounted on the lower glass of the film by a glass on glass (FOG) method, and the signal line and the common voltage application line 31a are connected to the driver IC 21. The control unit 35 is mounted on the main unit 34 to control the driving of the liquid crystal panel 11 by supplying various signals and voltages through the connection unit 31.

The control IC 35 receives video data and synchronization signals from the outside to generate video data and data control signals and gate control signals required by the driver IC 31. In addition, the required voltage is supplied to the driver IC 21 through a common voltage application line.

The ground terminal 32 is formed at one side of the common voltage application line 31a of the flexible substrate 30 to be electrically connected to the chassis of the LCD module.

The ground terminal 32 is formed in the main portion 34 of the flexible substrate 30 as shown in Figs. 1 and 2, and is in electrical contact with the chassis therein. In addition, the ground terminal 32 is spaced apart from the common voltage applying line 31a by a predetermined interval (about 0.2 to 0.3 mm), and the end of the ground terminal 32, that is, the portion of the common voltage applying line 31a has a lightning rod shape (triangle). Protrude sharply in the form of column or cone).

When a sudden surge voltage is introduced into the liquid crystal display by electrostatic discharge from the outside, the common voltage line 14 flows through the driver IC 21 to the common voltage application line 31a of the flexible substrate 30. This affects the control IC 35.

At this time, when the surge voltage due to the electrostatic discharge flowing to the common voltage application line 31a flows, the control IC 35 is protected by absorbing at the ground terminal 32 and passing through the chassis, thereby protecting the control IC 35. This protects against malfunction of the driver IC 21.

 Although the present invention has been described above with reference to the embodiments, these are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains should be provided within the scope not departing from the essential characteristics of the present invention. It will be appreciated that various modifications and applications are not possible.

For example, each component shown in detail in the embodiment of the present invention may be modified. And differences relating to such modifications and applications will have to be construed as being included in the scope of the invention defined in the appended claims.

According to the grounding structure of the liquid crystal display device according to the present invention, by forming a lightning rod-shaped ground structure in the flexible substrate close to the common voltage applying line, by effectively absorbing and emitting the surge voltage by the electrostatic discharge flowing to the common voltage applying line The liquid crystal display device can be effectively protected from sudden electrostatic discharge.

Claims (5)

A liquid crystal panel connected to a gate signal line, a data signal line and a common voltage line; A flexible substrate having various signal lines and common voltage application lines connected to gates, data signal lines, and common voltage lines of the liquid crystal panel; And at least one ground terminal formed on the flexible substrate and absorbing a surge voltage by an electrostatic discharge flowing through the common voltage applying line. The method of claim 1, And a driver IC mounted on the liquid crystal panel to interface data to and from the flexible substrate with data input and output through various signal lines and common voltage lines. The method of claim 1, The ground terminal is a ground structure of the liquid crystal display device, the end is formed in the shape of a lightning rod. The method of claim 1, A ground structure of the liquid crystal display device spaced apart from each other by 0.2 to 0.3 mm between the ground terminal and the common voltage line. The method of claim 1, A ground structure of the liquid crystal display device, wherein the ground terminal of the substrate is connected to the chassis.

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