KR19990081110A - Antistatic device of liquid crystal display for COG mounting - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to an antistatic device of a liquid crystal display device for mounting a COG, which prevents static electricity from an input pad in a liquid crystal display device having a COG structure. A plurality of gate lines and data lines, a plurality of input pads formed at portions facing the respective output pads, a common electrode formed between the plurality of input pads and output pads of the gate line and the data line, It includes a plurality of electrostatic circuits connected between each input pad and the common electrode.

Description

Antistatic Device for COB Mount Liquid Crystal Display

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly, to an antistatic device of a liquid crystal display device for preventing static electricity of an input pad in a liquid crystal display device having a COG structure.

In general, in a liquid crystal display, mounting technologies for connecting a driving IC for supplying a driving signal for driving a TFT-LCD liquid crystal display to a TFT-LCD panel include WB (Wire Bonding), TAB (Tape Automated Bonding), And COG (Chip On Glass) method.

First, the WB method is a mounting method using a method of connecting a panel electrode and a driving IC using gold (Au) wire.

Second, the TAB method is a technology for mounting a package in which a driving IC is connected to a film carrier on a panel.

Third, the COG method is a technology in which a bump is formed on a bare chip itself and then mounted on a panel in which inner lead pads and out lead pads are formed.

In addition, since static electricity is applied to the internal TFT-LCD array during the process of the liquid crystal display device, the internal elements (thin film transistors, etc.) are destroyed, and a shorting bar is needed to prevent the array and to facilitate the array inspection after the TFT-LCD array is completed. .

That is, the shorting bar is composed of one shorting bar connected to each gate line and another shorting bar connected to each data line, so that power is supplied to the shorting bar to which each gate line is connected in order to check whether the gate line is short-circuited when inspecting the array. It is applied and checked on the opposite side of each gate line to check whether there is a short circuit in the gate line, and the data line is also checked in the same manner.

As described above, the shorting bar is not used at all in driving the actual TFT-LCD, but is used at the time of antistatic and array inspection as described above, and thus is finally removed.

That is, when the array of the TFT-LCD is completed and the inspection of the array is completed, the top plate and the bottom plate are bonded together, and then the shorting bar is removed through a scribe process and a grinding process.

On the other hand, in forming such a shorting bar, it is difficult to form the shorting bar according to the mounting method because the configuration of the gate line and the data line is different according to the mounting method.

That is, in the TAB method, since carrier films are connected to both sides of the bare chip, space can be secured on the TFT-LCD panel, and a shorting bar is formed on one side of the gate line pad and data line pad, which are driving IC mounting regions.

However, in the COG method, since the inner lead and the out lead should be formed in the driving IC mounting area of the TFT-LCD panel, it is difficult to secure a space on the TFT-LCD panel and it is difficult to install the shorting bar in the driving IC mounting area.

Recently, however, a technology in which a shorting bar is installed in a COG mounting area has been developed in a liquid crystal display device for a COG mounting method.

Referring to the accompanying drawings, a conventional technique of forming a shorting bar in such a COG mounting liquid crystal display device is as follows.

FIG. 1 is a layout view of a conventional COG mounting liquid crystal display device having a shorting bar, and FIG. 2 is a layout view of a conventional COG mounting liquid crystal display device having an antistatic circuit.

First, in a conventional COG mounting liquid crystal display device having a shorting bar, a plurality of gate lines 1 are arranged in one direction with a predetermined distance on a substrate, and have a constant interval in a direction perpendicular to each of the gate lines 1. A plurality of data lines 2 are arranged.

Gate line pads 3 and data line pads 4 are formed at one end of each of the gate lines 1 and the data lines 2, and a portion of the gate line pads 3 and the data line pads 4, which are opposite to the gate line pads 3, have a predetermined interval. In addition, a plurality of gate line input pads 7 are formed, and a plurality of data input pads 8 are formed at predetermined intervals in portions facing the data line pads 4 as well.

Here, the portion where the gate line input pad 7 is formed so as to face each gate line pad 3 is the gate driving IC mounting region 9, and the data input pad 8 is disposed so as to face each data line pad 4. The formed portion is the data driver IC mounting region 10.

A first shorting bar 5 and a second shorting bar 6 are formed in the gate driving IC mounting area 9 and the data driving IC mounting area 10.

That is, the first shorting bar 5 is formed between each gate line pad 3 and the gate input pad 7, and each gate line pad 3 is connected to the first shorting bar 5.

The second shorting bar 6 is also formed between each data line pad 4 and the data input pad 8, and each data line pad 4 is connected to the second shorting bar 6.

In FIG. 1, reference numerals denote laser cutting lines 11.

The TFT-LCD including the thin film transistor and the pixel electrode is formed as described above, and then array inspection is performed as described above. After the inspection, the upper and lower plates are bonded to each other, and the shorting bars 5 and 6 and the gate line pad ( 3) and cut between the data line pad (4) using a laser cutting equipment (LASER CUTTING)

In addition, in the conventional COG mounting liquid crystal display device provided with the antistatic circuit, a plurality of gate lines 1 are arranged in one direction at regular intervals on a substrate, and are perpendicular to the gate lines 1. A plurality of data lines 2 are arranged at regular intervals in one direction to form a TFT-LCD, and a common electrode 12 is formed around the TFT-LCD array.

Gate line pads 3 and data line pads 4 are formed at one end of each of the gate lines 1 and the data lines 2, and a portion of the gate line pads 3 and the data line pads 4, which are opposite to the gate line pads 3, have a predetermined interval. In addition, a plurality of gate input pads 7 are formed, and a plurality of data input pads 8 are formed at predetermined intervals at portions facing the data line pads 4 as well.

Both ends of each of the gate line 1 and the data line 2 are connected to the adjacent common electrode 12 through an electrostatic circuit 13.

Here, the portion where the gate line input pad 7 is formed so as to face each gate line pad 3 is the gate driving IC mounting region 9, and the data input pad 8 is disposed so as to face each data line pad 4. The formed portion is the data driver IC mounting region 10. The common electrode 12 is connected to a common electrode (not shown) of the upper substrate by Ag dots.

However, such a conventional COG mounting liquid crystal display device has the following problems.

That is, in the conventional COG-mounted liquid crystal display device, a shorting bar or an electrostatic circuit for preventing static electricity is installed in the out lead pad toward the TFT-LCD array in the IC mounting area, thereby protecting the internal circuit of the TFT-LCD when static electricity is generated. However, since the input pads were all floating, there was no path through which static electricity escaped.

In addition, since the static electricity generated from the IC does not pass through the input pad after the IC is attached to the input / output pad, the static electricity may be damaged up to the IC.

The present invention has been made to solve the above problems, in the TFT-LCD liquid crystal display device mounted in a COG method by forming a common electrode line in the IC mounting area and connecting each input pad to the common electrode through an antistatic circuit An object of the present invention is to provide an antistatic device that prevents damage to static electricity of an input pad and static electricity of an IC.

1 is a layout view of a liquid crystal display (COG) mounting method in which a conventional shorting bar is formed.

FIG. 2 is a layout view of a COG mounted liquid crystal display device having a conventional electrostatic circuit.

3 is a layout diagram of the antistatic device of the COG mounting liquid crystal display device according to the first embodiment of the present invention.

4 is a configuration diagram of an electrostatic circuit according to the present invention;

5 is a layout diagram of the antistatic device of the COG mounting liquid crystal display device according to the second embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

1: gate line 2: data line

3, 4: pad 7: gate line input pad

8: data line input pad 9: gate driving IC mounting area

10: data drive IC mounting area 12, 12a, 12b: common electrode

13: electrostatic circuit

The antistatic device of the COG mounting liquid crystal display device of the present invention for achieving the above object is a plurality of gate lines and data lines each having an output pad at the end, and a plurality of portions formed in portions facing the respective output pads. A plurality of input pads, a common electrode formed between the plurality of input pads and output pads of the gate line and the data line, and a plurality of electrostatic circuits connected between the input pads and the common electrode. have.

The antistatic device of the liquid crystal display device of the present invention as described above will be described in more detail with reference to the accompanying drawings.

3 is a layout diagram of the antistatic device of the COG mounting liquid crystal display device according to the first embodiment of the present invention.

A plurality of gate lines 1 are arranged in one direction at regular intervals on the substrate, and a plurality of data lines 2 are arranged at regular intervals in a direction perpendicular to the respective gate lines 1 to form a TFT-LCD array. Is formed, and a common electrode 12 is formed around the TFT-LCD array.

A gate line output pad 3 and a data line output pad 4 are formed at one end of each gate line 1 and the data line 2, and a portion of the gate line 1 and the data line 2 opposite to each of the gate line output pads 3 is formed. A plurality of gate line input pads 7 are formed at regular intervals, and a plurality of data line input pads 8 are formed at predetermined portions at portions opposite to the data line output pads 4.

Here, the portion where the gate line input pad 7 is formed to face each gate line output pad 3 is the gate driving IC mounting region 9, and the data line input pad ( The portion where 8) is formed is the data driver IC mounting region 10.

The common electrode 12 is formed in the gate driving IC mounting region 9 and the data driving IC mounting region 10, respectively, and the common electrode 12, each gate line input pad 7, and a data line input pad are formed. 8 is connected by the electrostatic circuit 13, respectively.

In addition, the gate line 1 and the data line 2 are connected to the common electrode 12 around the TFT-LCD array formed by the gate line 1 and the data line 2 through a plurality of electrostatic circuits 13. ) Is connected.

Here, the configuration of the electrostatic circuit 13 is as shown in FIG.

That is, the first and second transistors Q1 and Q2 connected in series between the gate / data line 1 and 2 or the input pads 7 and 8 and the common electrode 12, and the first and second transistors. A third transistor Q3 includes a gate connected to the contacts of Q1 and Q2 and a source and a drain electrode connected to the gate of the first transistor Q1 and the gate of the second transistor Q2, respectively.

Each transistor of such an electrostatic circuit is formed in the same structure as a thin film transistor (not shown) of the TFT-LCD array, and the manufacturing process is the same.

5 is a layout diagram of the antistatic device of the COG mounting liquid crystal display device of the second embodiment of the present invention.

In the antistatic device of the COG mounting liquid crystal display device according to the second embodiment of the present invention, a plurality of gate lines 1 are arranged in one direction at regular intervals on a substrate, and are fixed in a direction perpendicular to the respective gate lines 1. A plurality of data lines 2 are arranged at intervals to form a TFT-LCD array, and a common electrode 12 is formed around the TFT-LCD array.

A gate line output pad 3 and a data line output pad 4 are formed at one end of each gate line 1 and the data line 2, and a portion of the gate line 1 and the data line 2 opposite to each of the gate line output pads 3 is formed. A plurality of gate line input pads 7 are formed at regular intervals, and a plurality of data input pads 8 are formed at regular intervals at portions facing the data line output pads 4.

Here, the portion where the gate line input pad 7 is formed to face each gate line output pad 3 is the gate driving IC mounting region 9, and the data input pad 8 is arranged to face each data line output pad 4. Is formed in the data driving IC mounting area 10.

A first common electrode 12a is formed to intersect the gate line 1 among the gate driving IC mounting region 9 and the TFT-LCD array peripheral region, and the data driving IC mounting region 10 and the TFT-LCD are formed. The second common electrode 12b is formed to intersect the data line 2 in the array peripheral area.

A plurality of electrostatic circuits 13 are connected between the first common electrode 12a, each gate line input pad 7, and each gate line 1, and a second common electrode 12b and each data input pad are provided. A plurality of electrostatic circuits 13 are connected between the 8 and the data lines 2, and the first and second common electrodes 12a and 12b are connected to each other by the electrostatic circuit 13.

In the second embodiment, the electrostatic circuit is the same as that of FIG.

As described above, the antistatic device of the COG mounting liquid crystal display device of the present invention has the following effects.

That is, a common electrode is formed in the IC mounting area and each input pad is connected to the common electrode through an electrostatic circuit to prevent static electricity from penetrating the input pad.

In addition, since a passage for extracting the static electricity of the IC generated after the IC is formed, the static electricity of the IC can be prevented.

Claims (6)

A plurality of gate lines and a plurality of data lines each having an output pad at an end thereof, A plurality of gate line input pads and a plurality of data line input pads respectively formed at portions facing the gate line output pads and the data line output pads; A common electrode integrally formed between the plurality of gate line input / output pads and the data line input / output pads; And a plurality of electrostatic circuits connected between each of the input pads and the common electrode. The method of claim 1, A common electrode is formed around the TFT-LCD array including each gate line and data line, and each gate line and data line are connected to the common electrode through an electrostatic circuit, thereby preventing static electricity of the COG mounting liquid crystal display device. Device. The method of claim 2, The electrostatic circuit includes first and second transistors connected in series between each gate line and data line and the common electrode; And a third transistor having a gate connected to a contact point of the first and second transistors, and a source and a drain electrode connected to a gate of the first transistor and a gate of the second transistor, respectively. Antistatic device of the device. The method of claim 1, The electrostatic circuit includes first and second transistors connected in series between each input pad and the common electrode; And a third transistor having a gate connected to a contact point of the first and second transistors, and a source and a drain electrode connected to a gate of the first transistor and a gate of the second transistor, respectively. Antistatic device of the device. A plurality of gate lines and a plurality of data lines each having an output pad at an end thereof, A plurality of gate line input pads and a plurality of data line input pads respectively formed at portions facing the gate line output pads and the data line output pads; A first common electrode formed between the plurality of gate line input pads and the plurality of gate line output pads; A second common electrode formed between the plurality of data line input pads and the plurality of data line output pads; And a plurality of electrostatic circuits connected between each of the input pads and the first and second common electrodes, and between the first and second common electrodes. The method of claim 5, A third common electrode intersecting each gate line and connected to the first common electrode and a third common electrode intersecting each data line and connected to the second common electrode around a TFT-LCD array composed of each gate line and data line And a fourth common electrode further formed, and each gate line and data line are connected to the third and fourth common electrodes through an electrostatic circuit.