KR100928492B1 - Liquid crystal display - Google Patents

Abstract

The present invention relates to a liquid crystal display device that prevents static electricity flowing from the outside through a dummy pattern, and is characterized in that a gap between a scribe line and a common line, And a plurality of dummy patterns.

Dummy pattern, static electricity, test, scribe line

Description

[0001] The present invention relates to a liquid crystal display device,

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

Fig. 2 is a circuit diagram showing a TFT inspection section at the line end of Fig. 1

3 is a cross-sectional view taken along line I-I '

Fig. 4 is a cross-sectional view taken along line II-II '

5 is a plan view showing a liquid crystal display device of the present invention

6 is a cross-sectional view taken along line III-III '

7 is a cross-sectional view taken along line IV-IV '

Description of the Related Art [0002]

41: gate line 42: data line

43: gate line side ESD element 44: data line side ESD element

47: common line 48: gate insulating film

49: contact hole 50, 51: dummy pattern

53, 54: TFT element inspection line 60: substrate

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 that prevents static electricity flowing from the outside through a dummy pattern.

(PDP), Electro Luminescent Display (ELD), Vacuum Fluorescent (VFD), and the like have been developed in recent years in response to the demand for display devices. Display) have been studied, and some of them have already been used as display devices in various devices.

Among them, the LCD is the most widely used in place of a CRT (Cathode Ray Tube) for the purpose of a portable image display device because of its excellent image quality, light weight, thinness and low power consumption, A television monitor for receiving and displaying a broadcast signal, a computer monitor, and the like.

In order to use such a liquid crystal display device as a general screen display device in various parts, it is said that it is important to realize high quality image such as high definition, high brightness, and large area while maintaining characteristics of light weight, thin shape and low power consumption .

A general liquid crystal display device can be broadly divided into a liquid crystal panel for displaying an image and a driving part for applying a driving signal to the liquid crystal panel. The liquid crystal panel includes first and second glass substrates, And a liquid crystal layer injected between the first and second glass substrates.                         

Here, the first glass substrate (TFT array substrate) has a plurality of gate lines arranged at regular intervals and arranged in one direction, a plurality of data lines arranged at regular intervals in a direction perpendicular to the gate lines, A plurality of pixel electrodes formed in a matrix form in each pixel region defined by intersecting gate lines and data lines and a plurality of thin film transistors switched by signals of the gate lines to transmit signals of the data lines to the pixel electrodes .

The second glass substrate (color filter substrate) is provided with a light-shielding layer for shielding light in a portion excluding the pixel region, an R, G, and B color filter layers for expressing color hues, .

The driving principle of the general liquid crystal display device utilizes the optical anisotropy and the polarization property of the liquid crystal. Liquid crystals have a directional arrangement of molecules because the structure is thin and long, and the direction of the molecular arrangement can be controlled by artificially applying an electric field to the liquid crystal.

Therefore, when the molecular alignment direction of the liquid crystal is arbitrarily adjusted, the molecular arrangement of the liquid crystal is changed, and light is refracted in the molecular alignment direction of the liquid crystal due to optical anisotropy, so that image information can be expressed.

At present, active matrix liquid crystal displays (LCDs), in which a thin film transistor and pixel electrodes connected to the thin film transistor are arranged in a matrix manner, have received the most attention because of their excellent resolution and video realization capability.

Hereinafter, a conventional liquid crystal display device will be described with reference to the accompanying drawings.

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

1, a conventional liquid crystal display device comprises an upper substrate 1, a lower substrate 2, and a liquid crystal layer (not shown) between the upper and lower substrates 1 and 2 formed opposite to each other. At this time, the lower substrate 2 is formed so as to have a certain area 30 on the outer periphery of the upper substrate 1 in order to form a driving part for driving the pixels.

A common line is formed in the outer portion 20 of the pixel portion 10 in order to apply a voltage to the common electrode on the side of the upper substrate 1 on which the power source portion is not formed. The common line 17 of the lower substrate and the Ag dot 15 of the upper substrate 1 are formed so that the voltage applied to the common line 17 is applied to the common electrode (not shown) of the upper substrate 1 .

FIG. 2 is a circuit diagram showing a TFT inspection portion of the line end of FIG. 1, FIG. 3 is a cross-sectional view taken along the line I-I 'of FIG. 2, and FIG. 4 is a cross-sectional view taken along line II-II' of FIG.

2 to 4, a common line 17 is connected to one end of each of the gate line Gn and the data line Dn as a countermeasure against internal and external static electricity so that the ESD (antistatic) .

Here, the gate lines Gn and the data lines Dn are formed externally before being removed by the grinding or cutting process on the scribe line 21, Thereby testing the TFT device characteristics.                         

Here, the line 23 flowing out to the outside for inspecting the TFT device characteristics is a data line metal component, and after the TFT device characteristics are inspected, the scribe line is removed from the scribe line.

During the cutting process of the scribe line, considerable high-voltage static electricity is generated from the outside. When such static electricity instantaneously flows, a short occurs between the common line 17 and the gate line or the data line.

Here, the common line 17 is formed of a gate line metal on the same layer as the gate line Gn, and the inspection line 23 flowing out to the TFT device for testing the TFT device characteristics intersects the common line 17 The inspection line 23 is formed of a data line metal in order to prevent conduction between the two.

That is, the insulating property of the gate insulating film 31 or the semiconductor layer (not shown) between the two lines due to the introduction of the high-voltage static electricity is destroyed by the common line 17 composed of the gate line metal formed on the different layer The voltage value applied to the common line is momentarily applied to the gate line Gn or the data line Dn connected to the inspection line. Therefore, the common voltage is momentarily applied to each gate line Gn or the data line Dn, not the voltage value of the desired level, resulting in display failure.

Further, after the cutting process of the scribe line, the common line is located at the outermost position, so that the common line becomes the most vulnerable part to static electricity after cutting.

Actual static electricity can occur before and after the process, and both the outside and inside of the liquid crystal panel are problematic, and the reliability is lowered due to the weakness of the common line.

The conventional liquid crystal display device has the following problems.

Generally, in the case of a TN mode liquid crystal display, a common electrode is formed on an upper surface, and a common line formed on an outer frame of a lower substrate connected to a power source for applying a voltage to the common electrode is Ag-doped.

On the other hand, in the cutting process of the scribe line of the liquid crystal panel, static electricity is instantaneously generated and flowed from the outside. At this time, the outermost lines after the scribing are common lines, A short of the line occurs.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and it is an object of the present invention to provide a liquid crystal display device which prevents static electricity flowing from the outside through a dummy pattern.

According to an aspect of the present invention, there is provided a liquid crystal display device including a plurality of conductive dummy patterns spaced apart from each other by a TFT element inspection line crossing a scribe line and a common line between a scribe line and a common line .                     

The plurality of dummy patterns are formed on the same layer as the gate lines.

The common line is formed in the same layer as the gate line.

The TFT element inspection line is formed in a layer different from the common line.

The TFT element inspection line is formed in the same layer as the data line.

Hereinafter, a liquid crystal display device according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 5 is a plan view of the liquid crystal display device of the present invention, FIG. 6 is a sectional view taken along line III-III 'of FIG. 5, and FIG. 7 is a sectional view taken along line IV-IV' of FIG.

5, the liquid crystal display device according to the present invention includes TFT element inspection lines 53 and 54 crossing the scribe line and the common line 47 between a scribe line (dotted line display) and a common line 47, A plurality of electrically conductive dummy patterns 50 and 51 are formed.

At this time, the plurality of dummy patterns 50 and 51 are formed of the gate line metal in the same layer as the gate line 41.

The common line 47 is formed on the same layer as the gate line 41.

Here, each of the gate lines 41 and each data line 42 is connected to the ESD element (static electricity prevention element) 43, 44 before the gate line 41 is removed by a grinding or cutting process on a scribe line And is connected to the TFT element inspection lines 52 and 53 externally so that a predetermined voltage value is applied to the TFT element inspection lines 52 and 53 to test the TFT element characteristics. The ESD devices 43 and 44 are connected to the common line 47 through the extension wirings 45 and 46.

At this time, since the TFT element lines 52 and 53 pass through the common line 47, the common line 47 prevents the TFT element lines 52 and 53 from being electrically connected to the common line 47 Is formed on a layer different from the layer formed. That is, since the common line 47 is formed on the same layer as the gate line 41, the common line 47 is formed on the same layer as the data line 42 formed after the gate line 41.

 The TFT element inspection line 52 formed at one end of the data line 42 may be formed in a pattern connected to the original data line 42 and the TFT element inspection line 52 formed at one end of the gate line 41 The element inspection line 53 has a portion electrically connected to the gate line 41 through the contact hole 49 so as to be formed in different layers.

In this case, the TFT element inspection line 52 may be formed in a different layer from both the gate line 41 and the data line 42. However, in this case, the height of the structure formed on the substrate is increased. The method is avoiding.

Here, the inspection line 53 flowing out to the outside of the TFT device characteristic is a metal component of the data line 42, and after the TFT device characteristic is inspected, it is removed from the scribe line during the scribing process.

During the cutting process of the scribe line, considerable high-voltage static electricity is generated from the outside. When such static electricity instantaneously flows, the dummy patterns 50 and 51 outside the common line 47 receive static electricity primarily Thereby preventing the static electricity from flowing into the pixel portion in the inside.

Accordingly, the static electricity generated in the liquid crystal panel of the finished product after or after the scribing line cutting process also has the antistatic function for the dummy patterns 50, 51 primarily against the common line 47, Each of the TFT element inspection lines crossing between the scribe line and the common line is separated for each inspection line so that each element can have an anti-static function. Even if the static electricity is lost due to the flow of static electricity into one dummy pattern 50 or 51, The area has a normal antistatic function, and the effective characteristics for such antistatic are prolonged.

The liquid crystal display of the present invention as described above has the following effects.

It is possible to protect the inner panel by cutting the scribe line or static electricity flowing from the outside to the panel side by blocking the dummy pattern of the gate line or the data line end.

Claims (5)

A pixel portion including a plurality of gate lines and a data line at the center of the lower substrate and a pad portion corresponding to adjacent two sides of the pixel portion, And a scribe line is defined at a boundary between the outer frame and the outer frame, A common line spaced apart from a scribe line of the lower substrate and formed on an outer frame portion where the pad portion is not formed; An electrostatic discharge element connected to one end of each of the gate lines and the data lines at an outer frame portion corresponding to the pixel portion and the common line; A TFT element inspection line having one end and a contact point of a gate line or data lines connected to the electrostatic discharge elements at an outer frame before the electrostatic discharge elements and crossing the common line and the scribe line; And And a dummy pattern formed for each TFT element inspection line between the common line and the scribe line. The method according to claim 1, Wherein the dummy pattern is formed on the same layer as the gate line. The method according to claim 1, Wherein the common line is formed on the same layer as the gate line. The method according to claim 1, And the TFT element inspection line is formed in a layer different from the common line. 5. The method of claim 4, And the TFT element inspection line is formed on the same layer as the data line.

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