KR20030053186A - Liquid Crystal Display Device - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to easily check whether or not a COG type liquid crystal panel operates and reduce the checking time. CONSTITUTION: A chip on glass type liquid crystal display includes a plurality of odd-numbered gate pads respectively connected to odd-numbered gate lines, a plurality of even-numbered gate pads respectively connected to even-numbered gate lines and formed at a position different from the position of the odd-numbered gate pads, and data pads(38) respectively connected to data lines. The gate pads and data pads are electrically connected to a conductive rubber pad(40) in order to inspect the gate lines and data lines.

Description

Liquid Crystal Display Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device suitable for defect inspection of a chip on glass liquid crystal panel.

In recent years, the spread of mobile communication terminals such as mobile phones and mobile phones such as PCS (Personal Communication System) has been rapidly expanding. Is a favorite. Such portable information terminals tend to be miniaturized to be easily carried by individuals, and according to the trend of miniaturization, portable information terminals tend to be miniaturized in liquid crystal displays, which are used as means for displaying images.

The liquid crystal display device displays an image on a liquid crystal panel in which liquid crystal cells are arranged in a matrix by adjusting light transmittance of liquid crystal cells according to a video signal. To this end, a liquid crystal display device is connected to data lines and gate lines, and a plurality of integrated circuits for supplying data signals and scan signals to data lines and gate lines, respectively. ) Is required. Such ICs are installed between a printed circuit board (hereinafter, referred to as a “PCB”) and a liquid crystal panel to supply signals supplied from the PCB to data lines and gate lines of the liquid crystal panel. IC mounting methods include tape automated bonding ("TAB") and chip on glass ("COG").

The COG method is a method in which the data driver IC 14 and the gate driver IC 16 are directly mounted on the lower substrate 12 of the liquid crystal panel 10 as shown in FIG. 1.

1 to 3, a conventional liquid crystal display device is patterned on a liquid crystal panel 10 bonded with liquid crystals interposed therebetween and a lower substrate 12 of the liquid crystal panel 10 to be connected to data lines DL. A data drive IC 14 for driving the gate, a gate drive IC 16 for sequentially scanning the gate lines GL on the lower substrate 12, data lines DL, and gate lines GL. ) And a bumper 22 for electrically connecting the data and gate pad portions 18 and 20 and the pad portions 18 and 20 to the ICs 14 and 16.

In the liquid crystal panel 10, liquid crystal cells are arranged in a matrix at intersections of the gate lines GL and the data lines DL. The liquid crystal panel 10 includes an upper substrate on which a color filter, a common electrode, and an alignment layer (not shown) are sequentially formed, a lower substrate on which a thin film transistor (hereinafter referred to as TFT), a pixel electrode, and an alignment layer are sequentially formed ( 12) and a liquid crystal (not shown) injected between the upper substrate and the lower substrate 12.

The data pad part 18 and the gate pad part 20 are formed side by side at the lower edge of the liquid crystal panel 10. The data pad unit 18 is connected to the data lines DL by the data link unit DK. Similarly, the gate pad part 20 is connected to the gate lines GL via the gate link part GK.

The data and gate pad portions 18 and 20 are connected to the data and gate driver ICs 14 and 16 by a bumper 22.

The COG type liquid crystal display device checks the operation of the liquid crystal panel 10 before the driver ICs 14 and 16 are mounted on the lower substrate 12 of the liquid crystal panel 10. The driver ICs 14 and 16 supply driving signals supplied through an input pad unit formed on one side, not shown, to the pad units 18 and 20 and the liquid crystal panel 10 on the other side. However, the test process for checking the operation of the liquid crystal panel 10 is performed before the driver ICs 14 and 16 are mounted. The COG type liquid crystal display device in which the portions 18 and 20 are opened cannot test the liquid crystal panel 10.

Accordingly, an object of the present invention is to provide a liquid crystal display device suitable for defect inspection of a chip on glass liquid crystal panel.

1 is a plan view showing a conventional liquid crystal display device.

FIG. 2 is a cross-sectional view illustrating the liquid crystal display shown in FIG. 1.

FIG. 3 is a diagram illustrating a pad part of the liquid crystal display shown in FIG. 1.

4 is a plan view illustrating a liquid crystal display according to an exemplary embodiment of the present invention.

5A and 5B are views showing the data pad portion shown in FIG. 4;

6A and 6B show the gate pad portion shown in FIG. 4;

<Description of Symbols for Main Parts of Drawings>

10, 30: liquid crystal panel 12, 32: lower substrate

14: data drive IC 16: gate drive IC

18, 20, 38, 42: pad portion 22: bumper

40, 50, 52: conductive rubber pad portion

In order to achieve the above objects, the liquid crystal display device according to the present invention is a chip on glass type liquid crystal display device, comprising: a plurality of odd gate pad portions connected to the odd gate lines and even gate lines And a plurality of even-numbered gate pad portions respectively connected to the gate pad portions and formed at positions different from the position of the gate pad portion, and a data pad portion connected to each of the data lines.

Other objects and features of the present invention in addition to the above objects will be apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described with reference to FIGS. 4 to 6.

4 to 6, in the liquid crystal display according to the present invention, the data pad portion 38 in which the pad length is extended, the odd-numbered gate pad GP2n-1 and the even-numbered gate pad GP2n are zigzag. It has a gate pad 42 alternately separated in the form.

The liquid crystal display according to the present invention includes a liquid crystal panel 30, a data drive IC 34 for driving data lines DL on the lower substrate 32 of the liquid crystal panel 30, and a lower substrate 32. And a gate drive IC 36 for sequentially scanning the gate lines GL on the upper surface, and a bumper electrically connecting the pad 38 and the ICs 34 and 36 to each other.

In the liquid crystal panel 30, liquid crystal cells are arranged in a matrix at intersections of the gate lines GL and the data lines DL. The liquid crystal panel 30 includes an upper substrate on which a color filter, a common electrode, and an alignment layer (not shown) are sequentially formed, a lower substrate 32 on which a thin film transistor, a pixel electrode and an alignment layer are sequentially formed, and an upper substrate. It is composed of an unillustrated liquid crystal injected between the lower substrate 32.

The data pad part 38 and the gate pad part 42 are formed side by side at the lower edge of the liquid crystal panel 30. The data pad part 38 is connected to the data lines DL by the data link part DK, and the gate pad part 42 is connected to the gate lines GL via the gate link part GK. The data and gate pad portions 38 and 42 are connected to the data and gate driver ICs 34 and 36 by bumpers formed on one side.

On / off inspection of the liquid crystal panel 30 is performed by the conductive rubber pads 40 and 50 before the data and gate driver ICs 34 and 36 are mounted. The voltage is supplied to the pad part 42 to inspect the gate lines GL and the data lines DL.

The data pad portion 38 is formed to be longer in length than the conventional data pad portion 18 as shown in FIG. 5A. As the length of the data pad portion 38 is extended, the area of the data pad portion 38 is increased and the exposed area of the data pad portion 38 is increased. Accordingly, the contact area with the conductive rubber pad 40 mounted on the test equipment (not shown) as shown in FIG. 5B is increased. After the conductive rubber pad 40 and the data pad unit 38 are connected, the data lines DL are inspected by supplying a direct current (DC) voltage.

The data link unit DK is formed to have a relatively smaller line width than the data pad unit 38, and is formed of a metal having good electrical conductivity, for example, a metal material such as copper (Cu). The data link unit DK is patterned to connect the data pad unit 38 and the data lines DL.

As shown in FIG. 6A, the gate pad part 42 is formed such that positions of the odd-numbered gate pad GP2n-1 and the even-numbered gate pad GP2n are alternated with each other. At this time, each of the odd-numbered gate pads GP2n-1 and the even-numbered gate pad GP2n is aligned in a row. The gate pad part 42 divided into the odd-numbered gate pad GP2n-1 and the even-numbered gate pad GP2n is electrically connected to the gate lines GL through the gate link part GK. The gate link part GK is formed to have a line width relatively smaller than that of the gate pad part 42. The gate link part GK is formed of a metal material having good electrical conductivity, for example, copper (Cu).

In the COG type liquid crystal display device having the structure of the gate pad part 42, the gate pad part 42 is divided into the odd-numbered gate pad GP2n-1 and the even-numbered gate pad GP2n. When supplying a scan signal to check the operation of the operation 30 to the gate lines GL, each of the first and second conductive rubber pads 50 and 52 of the test inspection apparatus is connected to the odd gate pad GP2n−. 1) and even-numbered gate pad GP2n. Accordingly, as shown in FIG. 6B, the odd-numbered gate lines GL2n−1 and the even-numbered gate lines GL2n are separated to contact the first and second conductive rubber pads 50 and 52.

The COG type liquid crystal panel 30 may inspect whether the liquid crystal panel 30 is on or off before the driver ICs 34 and 36 are mounted. When voltage is applied to the first and second conductive rubber pads 50 and 52, a voltage is applied to the conductive particles added to the conductive rubber and the respective data pad portion 38 and the gate pad are in contact with the conductive particles. The part 42 is supplied with voltage by these electroconductive particles. At this time, in the case of the normally white liquid crystal panel 30, the black state should be maintained according to the application of voltage. If any one of the gate line GL or the data line DL is defective, only the line is defective. No voltage is applied to maintain the white state. Thereby, the existence or absence of the defect of a liquid crystal panel can be confirmed. Alternatively, if the liquid crystal cell is defective, it may be confirmed that a point defect occurs.

In the case of inspecting the small liquid crystal panel using the conductive rubber pad, the liquid crystal panel 30 may be inspected using an automatic probe (Auto Probe) instead of the on / off inspection. In the automatic inspection process, a test pattern is displayed on the screen of the completed liquid crystal panel and the presence or absence of defective pixels is detected and repaired when a defective pixel is found.

In this way, the area of the data pad 38 is enlarged and the gate pad 42 is separated so that the conductive rubber pads are incorrectly connected to the pads 38 and 42 when the liquid crystal panel 30 is inspected for defects. In addition to this, the inspection time of the liquid crystal panel 30 can be shortened.

As described above, the liquid crystal display according to the present invention extends the length of the data pad portion and separates the gate pad portion into odd and even numbers. Accordingly, the operation of the COG type liquid crystal panel can be easily inspected and the inspection time can be shortened.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (3)

In a chip on glass liquid crystal display device, A plurality of odd gate pad portions respectively connected to the odd gate lines, A plurality of even-numbered gate pad parts connected to the even-numbered gate lines and formed at positions different from the position of the gate pad part, And a data pad part connected to each of the data lines. The method of claim 1, And a gate pad portion and a data pad portion electrically connected to a conductive rubber pad to inspect the gate lines and the data lines. The method of claim 2, And the odd-numbered gate pad portions are in contact with the first conductive rubber pad, and the even-numbered gate pad portions are electrically connected to the second conductive rubber pad.