KR100924228B1 - Liquid Crystal Display Panel And Fabricating Method Thereof - Google Patents

Abstract

The present invention relates to a liquid crystal display panel and a method of manufacturing the same that can prevent damage caused by static electricity.

According to an exemplary embodiment of the present invention, a liquid crystal display panel includes a signal line having an external signal input terminal, a common line intersecting the signal lines, and a base voltage supplied thereto, an intersection point between the common line and the signal lines, and the external line connected to the common line. And an antistatic device connected to the signal line between signal input terminals to remove static electricity from the signal line.

Description

Liquid crystal display panel and manufacturing method therefor {Liquid Crystal Display Panel And Fabricating Method Thereof}             

1 is a diagram illustrating an inspection pad part of a conventional liquid crystal display panel.

2 is a view illustrating another test pad part of a conventional liquid crystal display panel.

3 is a cross-sectional view showing in detail the contact hole shown in FIG.

4 is a view illustrating in detail a test pad part of a liquid crystal display panel according to an exemplary embodiment of the present invention.

5 is a view showing another position of the antistatic device shown in FIG.

6 is a view illustrating in detail a test pad unit of a liquid crystal display panel according to a second exemplary embodiment of the present invention.

<Brief description of symbols for the main parts of the drawings>

1 substrate 2,38 antistatic device

4,34,36: Test pad 6,40,42: Contact hole

8 insulating film 32 display area

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display panel and a method of manufacturing the same that can prevent damage caused by static electricity.

Conventional liquid crystal display devices display an image by adjusting the light transmittance of the liquid crystal using an electric field. To this end, the liquid crystal display includes a liquid crystal display panel in which liquid crystal cells are arranged in a matrix, and a driving circuit for driving the liquid crystal display panel.

The liquid crystal display panel includes a thin film transistor array substrate and a color filter array substrate facing each other, a spacer positioned to maintain a constant cell gap between the two substrates, and a liquid crystal filled in the cell gap.

The thin film transistor array substrate includes gate lines and data lines, thin film transistors (TFTs) formed at intersections of the gate lines and data lines, and formed in a liquid crystal cell unit and formed in a TFT. A pixel electrode or the like connected thereto. The gate lines and the data lines receive signals from the driving circuits through the respective pad parts. The TFT supplies the pixel voltage signal supplied to the data line to the pixel electrode in response to the scan signal supplied to the gate line.

The color filter array substrate includes color filters formed in units of liquid crystal cells, a black matrix for distinguishing between color filters and absorbing external light, a common electrode for supplying a reference voltage to the liquid crystal cells in common.

The liquid crystal display panel is manufactured by separately manufacturing a thin film transistor array substrate and a color filter array substrate, and then injecting a liquid crystal.

In particular, the thin film transistor array substrate undergoes an inspection process such as a lighting test to detect whether a signal line defect such as short or open signal lines or a TFT is defective after a manufacturing process.

The liquid crystal panel illustrated in FIG. 1 includes a display area in which a plurality of liquid crystal cells are provided, and a non-display area formed at an outer side of the display area and in which an inspection pad part used in an inspection process is located.

The display area includes TFTs formed at intersections of gate lines and data lines, and liquid crystal cells connected to the TFTs, that is, liquid crystal capacitors. The liquid crystal capacitor Clc includes a pixel electrode and a common electrode that face each other with the liquid crystal cell interposed therebetween. The liquid crystal capacitor Clc adjusts the light transmittance by driving the liquid crystal having dielectric anisotropy according to the data signal supplied to the pixel electrode.

The test pad unit positioned in the non-display area includes a plurality of test pads 4 and an antistatic element 2 connected to each of the test pads 4.

The test pad 4 supplies test signals necessary for the inspection process of the liquid crystal display panel to at least one signal line SL of the gate line and the data line of the display area. To this end, the test pad 4 is electrically connected to the signal lines SL of the display area and the supply lines PL of the non-display area, and the supply lines PL are shorting bars to which test signals are supplied. SB).

Each of the antistatic devices 2 is connected between the common line CL and the signal line SL, to which at least one of the common voltage Vcom, the ground voltage GND, and the floating voltage are supplied, so that the test pad ( It blocks the static electricity flowing through 4). The antistatic device 2 is generally composed of a plurality of thin film transistors to block the inflow of static electricity by having a low impedance in the high voltage region due to static electricity or the like so that the overcurrent is discharged through the common line CL. In addition, the antistatic element 2 has a high impedance (for example, several tens of kHz) in a normal driving environment so as not to affect the driving signal supplied through the signal line.

The supply line PL of the conventional liquid crystal display panel illustrated in FIG. 1 supplies a test signal generated by an inspection driver circuit (not shown) to the signal line SL of the display area through the inspection pad 4. When the supply line PL and the signal line SL are formed of the same metal, for example, relatively high resistivity of molybdenum, there is a problem in that signal delay occurs. In particular, an output is output to a driving signal applied between a supply line PL corresponding to the outer output line of the inspection driving circuit generating a test signal and a supply line PL corresponding to the central output line having a shorter length than the outer output line. There is a problem that a deviation occurs. In order to solve this problem, as shown in FIG. 2, the supply line PL is formed of a relatively low resistance aluminum-based material.

The supply line PL and the signal line SL of the liquid crystal display panel illustrated in FIG. 2 are formed on different layers and electrically connected to each other through the contact hole 6. For example, as illustrated in FIG. 3, the supply line PL is formed on the same layer as a gate metal together with a gate pattern including a gate electrode and a gate line on the substrate 1, and the signal line SL A data metal is formed on the same layer together with a data pattern including a source and a drain electrode formed with the gate pattern and the insulating film 8 interposed therebetween. That is, the supply line PL is formed of a metal having low resistance, for example, aluminum / neodium (AlNd), and the signal line SL is formed of molybdenum (Mo).

As such, the supply line PL is formed of a material having low resistance to the layer different from the signal line SL and is electrically contacted with the signal line SL through the contact hole 6. Accordingly, the output deviation of the drive signal of the supply line PL corresponding to the outer output line and the center output line of the inspection driver circuit can be reduced, and thus the image quality of the display can be prevented.

In the cross-sectional area A of at least one of the signal lines SL and the common lines CL of the gate lines and the data lines of the conventional liquid crystal display panel shown in FIGS. As a result, an insulation breakdown of the insulating layer 8 occurs, causing a short defect between the common lines CL and the signal lines SL. Alternatively, a defect may occur in that the signal lines SL are turned off due to the inflow of static electricity in the intersection area A.

In addition, the contact area B between the signal lines SL and the supply lines PL of the conventional liquid crystal display panel illustrated in FIG. 2 is relatively weak against the inflow of static electricity from the outside, A failure may occur in which the supply lines PL itself are turned off.

Accordingly, an object of the present invention is to provide a liquid crystal display panel and a method of manufacturing the same that can prevent damage caused by static electricity.

In order to achieve the above object, a liquid crystal display panel according to the present invention includes a signal line having a supply line, a common line crossing the signal lines and supplied with a base voltage, connected to the common line, and the common line and And an antistatic device connected to the signal line between an intersection of signal lines and the supply line to remove static electricity from the signal line.

The liquid crystal display panel may further include a test pad formed on the signal line between the intersection point and the supply line and connected to the probe.

The antistatic device is connected to the signal line between the supply line and the test pad.

The signal line may include a first signal line of a first metal having the supply line and a second signal line of a second metal connected to the first signal line through a contact hole.

The first and second signal lines may be formed on the same layer.

The first and second signal lines may be located on different layers.                     

The first signal line may be formed of a metal having a lower resistance than the second signal line.

The antistatic device may be connected between the first signal line and the common line before the contact hole.

The liquid crystal display panel may further include an even shorting bar commonly connected to the even signal line among the signal lines, and an odd shorting bar commonly connected to the odd signal line.

In order to achieve the above object, the manufacturing method of the liquid crystal display panel according to the present invention comprises the steps of forming a signal line having a supply line, forming a common line crossing the signal lines and the base voltage is supplied; And forming an antistatic element connected to the common line and connected to the signal line between the intersection of the common line and the signal lines and the supply line to remove static electricity from the signal line. .

Other objects and advantages of the present invention in addition to the above object will become apparent from the description of the preferred embodiment of the present invention with reference to the accompanying drawings.

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

4 illustrates a liquid crystal display panel according to an exemplary embodiment of the present invention.

Referring to FIG. 4, a liquid crystal display panel according to the present invention includes a display area 32 in which a plurality of liquid crystal cells are provided, and a non-display in which an inspection pad part used in an inspection process is formed in an outer area of the display area 32. With area

The display area 32 includes gate lines GL, data lines DL intersecting the gate lines GL insulated from the gate lines GL, and intersection portions of the gate lines GL and the data lines DL. And a liquid crystal cell, that is, a liquid crystal capacitor Clc, connected to the thin film transistor TFT.

Each of the gate lines GL receives a gate signal from a gate driving circuit, and each of the data lines DL receives a data signal from a data driving circuit.

The thin film transistor TFT supplies the data signal from the data line DL to the liquid crystal capacitor Clc in response to the gate signal from the gate line GL.

The liquid crystal capacitor Clc includes a pixel electrode and a common electrode that face each other with the liquid crystal cell interposed therebetween. The liquid crystal capacitor Clc adjusts the light transmittance by driving the liquid crystal having dielectric anisotropy according to the data signal supplied to the pixel electrode.

The non-display area includes a gate test pad 34 connected to the gate lines GL of the display area 32, a data test pad 36 connected to the data lines DL, and a display area 32, respectively. An antistatic device 38 is connected between the supply line PL (external signal input terminal) and the common line CL to block static electricity from flowing into. In addition, the non-display area includes an odd gate shorting bar OGSB commonly connected to the odd gate lines GL through the odd supply line PL, and even gate lines GL through the even supply line PL. The even gate shorting bar EGSB connected to the common gate, the odd data shorting bar ODSB commonly connected to the odd data lines DL through the odd supply line PL, and the even supply line PL. An even data shorting bar EDSB is connected to the even data lines DL in common.

The antistatic device 38 may include a supply line PL for supplying a test signal to the common line CL and the data line to which at least one of the common voltage Vcom, the ground voltage GND, and the floating voltage are supplied. ) Is connected between the respective to block the static electricity flowing through the data test pad (36). In addition, the antistatic element 38 is connected between each of the common line CL and the supply line PL to block the static electricity flowing through the gate inspection pad 34. The anti-static element 38 is generally composed of a plurality of thin film transistors to block the inflow of static electricity by having a low impedance in the high voltage region due to static electricity and the like to discharge the overcurrent through the common line (CL). In addition, the antistatic element 38 has a high impedance (for example, several tens of kHz) in a normal driving environment so as not to affect the driving signal supplied through the supply line.

In particular, the antistatic device 38 is connected between the common line CL and the supply line PL, and flows into the overlapping area where the data line DL and the common line CL intersect through the data inspection pad 36. The static electricity is blocked in advance. That is, before the intersection of the data line DL and the common line CL, the antistatic device 38 is connected between the common line CL and the supply line PL to block static electricity in advance. As a result, insulation breakdown of an insulating film (not shown) positioned in an overlapping region intersecting the data line DL and the common line CL can be prevented.

In addition, the antistatic device 38 is connected between the common line CL and the supply line PL, and flows into the overlapping area where the gate line GL and the common line CL cross through the gate test pad 34. The static electricity is blocked in advance. That is, before the intersection point of the gate line GL and the common line CL, the antistatic device 38 is connected between the common line CL and the supply line PL to block static electricity in advance. As a result, insulation breakdown of an insulating film (not shown) positioned in an overlapping region where the gate line GL crosses the common line CL may be prevented.

 Meanwhile, as illustrated in FIG. 5, the antistatic device 38 includes at least one signal line SL among the gate line GL and the data line DL between the intersection point C and the test pads 34 and 36. ) And the common line CL.

Defects such as opening and shorting of the gate lines DL according to the present invention supply a test signal to the odd gate shorting bar OGSB and even gate shorting bar EGSB, and then the odd gate shorting bar OGSB and even The resistance value between the gate shorting bars EGSB is detected and determined. Specifically, when the resistance value between the odd gate shorting bar OGSB and the even gate shorting bar EGSB is lower than the threshold resistance value, the gate short failure is determined, and when the resistance value is higher than the threshold resistance value, the gate open failure is determined.

Similarly, defects such as open or short of the data lines DL are supplied with test signals to the odd data shorting bar (ODSB) and even data shorting bar (EDSB), and then the odd data shorting bar (ODSB) and even The resistance value between the data shorting bars EDSB is detected and determined. Specifically, when the resistance value between the odd data shorting bar ODSB and the even gate shorting bar EDSB is lower than the threshold resistance value, it is determined as a data short failure, and when it is higher than the threshold resistance value, it is determined as a data open failure.                     

As described above, in the liquid crystal display panel according to the first exemplary embodiment, an antistatic device is connected between the common line and the supply line before the signal line and the common line of at least one of the gate lines and the data lines. Accordingly, it is possible to prevent short defects due to insulation breakdown in the overlapping area crossing the common lines and the signal lines due to the inflow of static electricity from the outside, and to prevent the open defects of the signal lines themselves.

6 is a diagram illustrating a liquid crystal display panel according to a second exemplary embodiment of the present invention.

Referring to FIG. 6, the liquid crystal display panel according to the second exemplary embodiment of the present invention has at least one signal line GL among the gate line GL and the data line DL in comparison with the liquid crystal display panel illustrated in FIG. 4. , DL and the supply line (PL) have the same components except that they are formed on different layers.

The supply line PL and the signal lines GL and DL of the liquid crystal display panel illustrated in FIG. 6 are formed on different layers and electrically connected to each other through the contact hole 40. For example, the supply line PL is formed on the same layer as the gate pattern including the gate line GL of the display area and the gate metal, and the signal line is the data line DL. It is formed with). For example, the supply line PL is formed of a low resistivity metal, aluminum / neodium (AlNd), and the signal line is formed of molybdenum (Mo).

As such, the supply line PL is formed of a material having a resistivity relative to the layer different from the signal line SL and is in electrical contact with the signal line SL through the contact holes 38 and 40. The antistatic device 38 is positioned between the signal line SL and the supply line PL and the common line CL connected through the contact holes 38 and 40.                     

That is, the antistatic element 38 is connected before the gate contact hole 42 between the common line CL and the supply line PL, so that the gate contact hole 42 and the gate line GL and the common line CL are connected. The static electricity flowing into the intersection point (E) of) is blocked in advance. Accordingly, an insulation breakdown of an insulating layer (not shown) positioned at an overlapping region intersecting the gate line GL and the common line CL is prevented, and at the same time, the gate lines GL and the supply lines PL The failure of opening the gate lines GL and the supply lines PL themselves in the gate contact hole 42 region of the gate contact hole 42 may be prevented.

In addition, the antistatic device 38 is connected before the data contact hole 40 between the common line CL and the supply line PL to connect the data contact hole 40, the data line DL, and the common line CL. The static electricity flowing into the intersection point (D) of) is blocked in advance. Accordingly, an insulation breakdown of an insulating layer (not shown) positioned at an overlapping area intersecting the data line DL and the common line CL is prevented, and at the same time, the data lines DL and the supply lines PL It is possible to prevent defects in which the data lines DL and the supply lines PL of the region of the data contact hole 40 are opened.

As described above, in the liquid crystal display panel according to the second exemplary embodiment, an antistatic device is connected between the common line and the supply line before the signal line and the common line of at least one of the gate lines and the data lines. Accordingly, it is possible to prevent short defects due to insulation breakdown at the overlapping portions crossing the common lines and the signal lines due to the inflow of static electricity from the outside, and to prevent the open defects of the signal lines themselves.

In addition, in the liquid crystal display panel according to the second exemplary embodiment of the present invention, an antistatic device is connected between the common line and the supply line before the contact hole portion of the signal line and the supply line formed on the different layers. Accordingly, it is possible to prevent open defects of the signal lines and the supply lines themselves, which are generated due to static electricity flowing from the outside in the contact hole portions of the signal lines and the supply lines.

As described above, the liquid crystal display panel and the method of manufacturing the same according to the present invention are common to at least one of the signal lines and the supply line before the intersection of the signal line and the common line of at least one of the gate line and the data line. An antistatic device is connected between the lines. Accordingly, the static electricity flowing into the intersection of the signal line and the common line may be blocked in advance, thereby preventing breakdown of the insulation due to the inflow of static electricity. In addition, it is possible to prevent the opening of the contact hole due to static electricity in the contact hole region of the signal line and the supply line.

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 (11)

A signal line having a supply line, A common line formed to cross the signal lines; And an antistatic device connected to the signal line and connected to the signal line between the intersection of the common line and the signal lines and the supply line to remove static electricity from the signal line. And a test pad formed on the signal line between the intersection point and the supply line. And the antistatic device is connected to the signal line between the supply line and the test pad. delete delete The method of claim 1, The signal line is A first signal line of a first metal having said supply line; And a second signal line of a second metal connected to the first signal line through a contact hole. The method of claim 4, wherein And the first and second signal lines are formed on the same layer. The method of claim 4, wherein And the first and second signal lines are on different layers. The method of claim 4, wherein And the first signal line is formed of a metal having a lower resistance than the second signal line. The method of claim 4, wherein And the antistatic device is connected between the first signal line and the common line before the contact hole. The method of claim 1, And one of a base voltage, a floating voltage, and a common voltage is supplied to the common line. The method of claim 1, And an even shorting bar commonly connected to the even signal line among the signal lines, and an odd shorting bar commonly connected to the odd signal line. Forming a signal line having a supply line, Forming a common line crossing the signal lines and supplied with a base voltage; Forming an antistatic device connected to the common line and connected to the signal line between the intersection of the common line and the signal lines and the supply line to remove static electricity from the signal line, And a test pad formed on the signal line between the intersection point and the supply line. And the antistatic device is connected to the signal line between the supply line and the test pad.

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