KR101241759B1 - Array substrate and display device having the same - Google Patents

Abstract

Disclosed are an array substrate and a display device having the same. The array substrate includes a base substrate, a first voltage wiring and a dispersion circuit portion. The base substrate includes a display area including a plurality of pixel parts and a pixel electrode formed in each pixel part, and a peripheral area surrounding the display area. The first voltage line is formed in the peripheral region and applies a first common voltage to the first common electrode facing the pixel electrode. The distribution circuit unit is electrically connected to an end of the first voltage wiring to dissipate static electricity introduced into the first voltage wiring. Accordingly, by forming the dispersion circuit part on the voltage line through which the common voltage is transmitted, it is possible to prevent the pixel portion of the display area from being damaged by the static electricity flowing through the voltage line.

Static electricity, dispersion, common voltage, voltage wiring

Description

Array substrate and display device having same {ARRAY SUBSTRATE AND DISPLAY DEVICE HAVING THE SAME}

1 is a plan view of an array substrate according to an embodiment of the present invention.

FIG. 2 is an equivalent circuit diagram of the distributed circuit unit shown in FIG. 1.

3 is a layout view of the distributed circuit unit shown in FIG. 1.

4 is a cross-sectional view taken along line II ′ of FIG. 3.

5 is a plan view of a display device according to another exemplary embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100 array substrate 110 dummy pixel portion

120: pad portion 130, 140: first and second short points

131 and 133: first and second voltage wiring 141 and 143: third and fourth voltage wiring

150: first gate circuit portion 160: second gate circuit portion

171, 172, 173, and 174: first, second, third, and fourth distributed circuit units

The present invention relates to an array substrate and a display device having the same, and more particularly, to an array substrate and a display device having the same for improving a defect caused by static electricity.

 In general, a liquid crystal display includes an array substrate and an opposite substrate facing each other, a liquid crystal display panel including a liquid crystal layer interposed between the substrates, and a driving device for driving the liquid crystal display panel.

The array substrate includes a plurality of gate lines and a plurality of data lines, and a thin film transistor TFT connected to the gate lines and data lines, respectively. Due to the application of new technologies with high integration such as ASG (Amorphous Silicon Gate) or Chip On Glass (COG), the array substrate has increased static defects as the pattern of high metal density is used.

During the manufacturing process of the array substrate and the liquid crystal display panel, the static electricity generated in the process flows into the metal lines formed on the array substrate. Such static electricity causes wiring defects such as disconnection and short circuit of the wirings, and also causes defects such as damaging the thin film transistor TFT.

Accordingly, the technical problem of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an array substrate for preventing a defect caused by static electricity.

Another object of the present invention is to provide a display device including the array substrate.

An array substrate according to an embodiment for realizing the above object of the present invention includes a base substrate, a first voltage wiring and a distributed circuit unit. The base substrate includes a display area including a plurality of pixel parts, a pixel electrode formed in each pixel part, and a peripheral area surrounding the display area. The first voltage line is formed in the peripheral area, and applies a first common voltage to a first common electrode facing the pixel electrode. The distribution circuit unit is electrically connected to an end portion of the first voltage line to dissipate static electricity introduced into the first voltage line.

A display device according to an embodiment for realizing another object of the present invention includes an array substrate and an opposing substrate. The array substrate is formed in a display area in which pixel electrodes are formed and a peripheral area surrounding the display area, and is formed at an end of the voltage line and a voltage line for applying a common voltage to a common electrode facing the pixel electrodes. It includes a distribution circuit for dispersing the energy of the static electricity introduced into. The opposite substrate faces the array substrate and the common electrode is formed.

According to the array substrate and the display device having the same, the distributed circuit unit may be formed on the voltage line through which the common voltage is transmitted, thereby preventing the pixel portion of the display area from being damaged by static electricity flowing through the voltage line.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings.

1 is a plan view of an array substrate according to an embodiment of the present invention.

Referring to FIG. 1, an array substrate includes a display area DA and first, second, third, and fourth peripheral areas PA1, PA2, PA3, and PA4 surrounding the display area DA.

A plurality of gate lines GL, a plurality of source lines DL, and a plurality of pixel portions defined by the gate lines and the source lines are formed in the display area DA. Each pixel portion P includes a thin film transistor TFT connected to a gate line GL and a source line DL, a pixel electrode PE connected to the thin film transistor TFT, and a storage capacitor CST.

Dummy pixel parts 110 are formed at an edge of the display area DA. A first common voltage VCOM1 is applied to the source wirings of the dummy pixel parts 110 to display a white grayscale image (normally white mode). The first common voltage VCOM1 is a voltage applied to a common electrode of an opposite substrate (not shown) facing the pixel electrode PE.

A pad part 120 having a plurality of pads 121 formed therein is formed in the first peripheral area PA1. The pad part 120 includes a source pad 121, a first voltage pad 122, a second voltage pad 123, a third voltage pad 124, and a fourth voltage pad 125.

The source pad 121 is formed at one end of the source wiring DL to receive a source signal. The first and second voltage pads 122 and 123 are connected to one ends of the first and second common wires 131 and 141, respectively, so that the first and second common voltages VCOM1 and VCOM2 are input. do. The third and fourth voltage pads 124 and 125 are connected to one ends of the third and fourth common wires 133 and 143, respectively, so that the first and second common voltages VCOM1 and VCOM2 are Is entered. The second common voltage is a common voltage applied to the common electrode of the storage capacitor CST.

The second peripheral area PA2 faces the first peripheral area PA1, and a first short point 130 and a second short point 140 are formed. The first and second short points 130 and 140 are shorted with the common electrode of the opposing substrate to apply the first common voltage VCOM1 to the opposing substrate.

In the third peripheral area PA3, a first gate circuit unit 150 for outputting a gate signal to gate lines of a first group of the gate lines GL, and a first connected to the first voltage pad 122. A second common wiring 133 connected to the common wiring 131 and the second voltage pad 123 is formed. The first common line 131 is electrically connected to the source lines of the dummy pixel parts 110. Accordingly, the dummy pixel units 110 apply a first common voltage VCOM1 to display a white grayscale image (normally white mode).

The fourth peripheral area PA4 faces the third peripheral area, and includes a second gate circuit unit 160 that outputs a gate signal to gate lines of a second group of the gate lines GL. A third common wiring 141 connected to the third voltage pad 124 and a fourth common wiring 143 connected to the fourth voltage pad 124 are formed. The third common line 141 is electrically connected to the source lines of the dummy pixel parts 110 to display a white grayscale image.

A plurality of distributed circuit units 171, 172, 173, and 174 are formed in the first and third common lines 131 and 141 through which the first common voltage VCOM1 is transmitted. When the static electricity flows into the first common wiring 131 during the manufacturing process, each distributed circuit unit 171 delays or disperses the static electricity so that the static electricity flows into the pixel portion P of the display area DA. Prevent it.

That is, as the first and third common lines 131 and 141 are connected to the source lines of the dummy pixel parts 110, the first and second short points 130 and 140 or the first and third common lines. Static electricity flowing into the wirings 131 and 141 flows into the display area DA through the dummy pixel parts 110, thereby causing damage to the pixel part P. Accordingly, the pixel unit may be delayed or dispersed in the first to fourth distributed circuit units 171, 172, 173, and 174 electrically connected to the first and third common lines 131 and 141. (P) can be damaged.

Preferably, the first to fourth distributed circuit units 171, 172, 173, and 174 are formed at ends of the first and third voltage lines 131 and 141 to which static electricity flows, respectively. As illustrated, the first and second distributed circuit units 171 and 172 are formed at both ends of the first voltage line 131, respectively, and the third and fourth distributed circuit units 173 and 174 are formed in the third unit. It is formed at both ends of the voltage wiring 141, respectively.

2 is an equivalent circuit diagram of the distributed circuit unit shown in FIG. 1, FIG. 3 is a layout diagram of the distributed circuit unit shown in FIG. 1, and FIG. 4 is a cross-sectional view taken along line II ′ of FIG. 3.

Referring to FIG. 2, the first distribution circuit unit 171 includes a plurality of switching elements TR1 and TR2. Each switching element TR1 includes a source electrode SE and a drain electrode DE connected to the first voltage line 131, and a gate electrode GE in a floating state.

When static electricity flows into the first voltage line 131, a large voltage difference is caused between the gate electrode GE in a floating state, and the voltage difference acts as a factor of a breakdown voltage, thereby switching the switching element TR1. Destroy). As a result, the electrostatic energy is dispersed by the switching elements TR1 and TR2.

3 and 4, the first voltage line 131 and the gate electrode GE of the switching element TR1 are formed as a first metal layer on the base substrate 101. A gate insulating layer 102 is formed on the base substrate 101 on which the first voltage line 131 and the gate electrode GE are formed. The channel layer CH is formed on the gate electrode GE. The source electrode SE and the drain electrode DE are formed as a second metal layer on the base substrate 101 on which the channel layer CH is formed. The protective insulating layer 103 is formed on the base substrate 101 on which the source and drain electrodes SE and DE are formed. The drain electrode DE is electrically connected to the first voltage line 131 by a first connection part C1, and the source electrode SE is connected to the second voltage line by a second connection part C2. 141) is electrically connected.

As a result, the static electricity introduced into the first voltage line 131 is first introduced into the switching elements TR1 and TR2 before being introduced into the pixel portion P of the display area DA, and thus the switching elements TR1. Energy of the static electricity is dispersed by destroying TR2). Accordingly, the pixel portion P is protected from static electricity.

5 is a plan view of a display device according to another exemplary embodiment of the present invention.

1 and 5, the display device includes a display panel for displaying an image and a driving device for driving the display panel. The display panel includes an array substrate 100 illustrated in FIG. 1, an opposing substrate 200 facing the array substrate 100, and a liquid crystal layer interposed between the substrates 100 and 200. It includes.

The display panel includes a display area DA in which a plurality of pixel parts P are formed, and first, second, third, and fourth peripheral areas PA1, PA2, PA3, and PA4 surrounding the display area DA. Is done. Each pixel portion P includes a switching element TFT, a liquid crystal capacitor CLC connected to the switching element TFT, and a storage capacitor CST electrically connected to the liquid crystal capacitor CLC. The pixel electrode PE of the liquid crystal capacitor CLC and the common electrode of the liquid crystal layer and the counter substrate 200 are applied, and a second common voltage VCOM2 is applied to the common electrode of the liquid crystal capacitor CLC.

First and third voltages applying the first common voltage VCOM1 to the common electrode of the liquid crystal capacitor CLC in the first, second, third and fourth peripheral regions PA1, PA2, PA3 and PA4. Second and fourth voltage wirings 133 and 143 are formed to apply the second common voltage VCOM2 to the wirings 131 and 141 and the common electrode of the storage capacitor CST.

First to fourth distributed circuit units 171 to 174 are formed at both ends of each of the first and third voltage lines 131 and 141. The first to fourth distributed circuit units 171 to 174 disperse energy of static electricity introduced into the first and second voltage lines 131 and 141 during the manufacturing process of the display device, thereby dispersing the energy of the display area DA. The pixel portion P is protected from the static electricity. Detailed configurations and operations of the first to fourth distributed circuit units 171 to 174 are omitted.

The driving device includes a driving chip 310 mounted in the first peripheral area PA1 of the array substrate 100, and a flexible printed circuit board 350 electrically connecting the driving chip 310 to an external device. Include. In addition, the driving device includes the first and second gate circuit parts 150 and 160 driven by a driving signal provided from the driving chip 310.

As described above, according to the present invention, the dispersion circuit unit is formed on the voltage line through which the common voltage is transmitted to delay and disperse the energy of static electricity flowing into the voltage line during the manufacturing process of the display device, thereby preventing the defective pixel portion from the static electricity. You can stop it.

Although described above with reference to the embodiments, those skilled in the art can be variously modified and changed within the scope of the invention without departing from the spirit and scope of the invention described in the claims below. I can understand.

Claims (8)

A base substrate including a display area including a plurality of pixel parts and a pixel electrode formed in each pixel part, and a peripheral area surrounding the display area; A first voltage line formed in the peripheral region and configured to apply a first common voltage to a first common electrode facing the pixel electrode; And And a dispersion circuit unit formed at an end of the first voltage line to dissipate static electricity introduced into the first voltage line. The method of claim 1, wherein the distributed circuit unit comprises a plurality of switching elements, And each switching element comprises a source and a drain electrode connected to the first voltage line and a gate electrode electrically floating. The display device of claim 1, further comprising dummy pixel parts formed between the display area and the peripheral area to which the first common voltage is applied. And the first voltage line is electrically connected to a source line for transmitting the first common voltage to the dummy pixel parts. 4. The display device of claim 3, further comprising: a voltage pad formed at one end of the first voltage line to receive the first common voltage; And A short point shorted with the first common electrode formed at the other end of the first voltage line; And the distributed circuit unit is formed adjacent to at least one of the voltage pad and the short point. The display device of claim 1, further comprising: a storage capacitor formed in the pixel portion; And And a second voltage line formed in the peripheral area to apply a second common voltage to a second common electrode of the storage capacitor. A voltage line formed in the display area in which the pixel electrodes are formed and a peripheral area surrounding the display area and applying a common voltage to the common electrode facing the pixel electrodes, and static electricity formed at an end of the voltage line and introduced into the voltage line. An array substrate including a dispersion circuit unit for dispersing energy of the substrate; And And an opposite substrate facing the array substrate and having the common electrode formed thereon. The semiconductor device of claim 6, further comprising: a voltage pad formed at one end of the voltage line to receive the common voltage; And And a short point shorted to the common electrode formed at the other end of the voltage line, And the distributed circuit unit is formed adjacent to at least one of the voltage pad and the short point. The method of claim 7, wherein the distributed circuit unit comprises a plurality of switching elements, Each switching element includes a source and a drain electrode connected to the first voltage line and a gate electrode electrically floating.

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