KR100542308B1 - Liquid crystal display - Google Patents

Abstract

The present invention discloses a liquid crystal display device that can be easily cured even when an open occurs in a data bus line. The disclosed invention has a substrate, a plurality of gate bus lines and data bus lines arranged in a matrix form on a substrate and defining unit pixel spaces, and switching elements disposed at intersections of the gate bus lines and data bus lines, respectively. A pixel electrode disposed in a space surrounded by the gate bus line and a data bus line while being connected to the switching element, and formed on the same plane as the gate bus line while being parallel to the gate bus line, A storage electrode overlapping with each other to form a storage capacitance, a gate insulating film insulating the gate bus line and the data bus line, and between the storage electrode and the pixel electrode, and disposed on the same plane as the gate bus line, and the storage electrode line Center gate bus LA A repair line disposed respectively in the portion and the lower gate bus line line, the repair line including a first branch extending in parallel with the data bus line and a second branch extending from the first branch and overlapping the data bus line; .

Description

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 a liquid crystal display device capable of easily redundancy upon opening a data bus line.

As the performance of active matrix liquid crystal display panels has developed rapidly, they have become widely used in applications such as flat panel TV systems or high-information monitors for portable computers.

In the active matrix liquid crystal display panel, a plurality of gate bus lines and a plurality of data bus lines are cross-arranged to define several unit pixel spaces.

Switching elements are disposed near intersections of these gate bus lines and data bus lines, and pixel electrodes made of a transparent material are disposed in each unit pixel while being connected to the switching elements.

1 is a plan view of a lower substrate of a general liquid crystal display.

1 shows a plurality of gate bus lines 1 extending in an x-axis direction on an upper portion of a lower substrate 10, and a plurality of data bus lines 3 are y-axis substantially perpendicular to the x-axis direction. Extend in the direction to define the unit pixel space pix1. In the figure only one gate bus line 1 and one data bus line 3 are shown. The thin film transistor TFT1 serving as a switching element is provided near the intersection of the gate bus line 1 and the data bus line 3, and the pixel electrode (pix1) is disposed in the unit pixel space pix1 to be in contact with the thin film transistor TFT1. 5) is placed.

In addition, the unit pixel space pix1 includes a storage electrode 7 overlapping the pixel electrode 5 to form a storage capacitor.

At this time, the storage electrode 7 branches from the first portion 7a and the first portion 7a parallel to the data bus line 3 in parallel with the gate bus line 1, as shown in FIG. 1. Second portion 7b. The first portion 7a is formed to overlap the edge portion of the pixel electrode 5 parallel to the gate bus line 1, and the second portion 7b is the pixel electrode 5 parallel to the data bus line 3. It is formed to overlap with the edge portion of the). Here, the first portion 7a extends to both sides parallel to the gate bus line 1, and is connected to the first portion of the adjacent unit pixel space (not shown). The storage electrode 7 is formed to surround the periphery of the pixel electrode 5, so that the opening ratio is improved.

In the liquid crystal display having the structure, when the gate bus line 1 is selected, a signal loaded on the data bus line 3 is transferred to the pixel electrode 5 through the thin film transistor TFT1. Then, an electric field is formed between the pixel electrode 5 and the common electrode of the upper substrate (not shown) to operate the liquid crystal molecules.

However, the above liquid crystal display device has the following problems.

In the above liquid crystal display, a short is likely to occur at an intersection of the gate bus line 1 and the data bus line 3 and at an intersection of the storage electrode 7 and the data bus line 3.

Such short defects can be easily performed by a repair method such as cutting a short generation site. However, opening of bus lines, particularly opening of data bus lines, is difficult to heal in the current process, and thus the liquid crystal display panel must be disposed of.

Furthermore, the formation of the storage electrode 7 in the form of an "n" as described above has the advantage that the aperture ratio is improved, but between the first portion 7a of the storage electrode 7 and the gate bus line and the storage electrode ( There is a high risk that a short will occur between the second portion 7b of 7) and the data bus line 3.

Accordingly, an object of the present invention is to provide a liquid crystal display device that can be easily cured even when an open occurs in a data bus line.

Another object of the present invention is to provide a liquid crystal display device capable of preventing short defects between the storage electrode and the gate bus line, and between the storage electrode and the data bus line.

According to an aspect of the present invention, a liquid crystal display device includes a substrate, a plurality of gate bus lines and data bus lines arranged in a matrix form on the substrate to define a unit pixel space, and the gate bus lines and data. A switching element disposed at an intersection point of a bus line, a pixel electrode disposed in an area surrounded by the gate bus line and a data bus line while being connected to the switching element, and parallel to the same plane as the gate bus line; A storage electrode formed to overlap the pixel electrode to form a storage capacitor, a gate insulating layer insulating the gate bus line and the storage electrode from the data bus line, and the same plane as the gate bus line and the storage electrode. Centering the storage electrode line on Top gate bus line are respectively arranged in the lower portion and the gate bus line, each of the two ends comprises a repair line is formed to overlap with the data bus line.

According to the present invention, a repair line is formed between the data bus line and the pixel electrode on the same plane as the gate bus line, so that the repair can be easily performed when the data bus line is opened.

At this time, the repair line is formed on the same plane as the gate bus line, and is spaced apart from the gate bus line and the storage electrode by a predetermined distance, and the short circuit defect can be reduced by being disposed with the gate insulating layer interposed between the data bus line and the data bus line. .

In addition, since the storage electrodes are formed in a straight line, short defects between the gate bus lines and the storage electrodes can be prevented.

Further, since the repair line is disposed between the data bus line and the pixel electrode, light leakage can be reduced.

(Example)

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

2 is a plan view of a lower substrate of the liquid crystal display according to the present invention.

Referring to FIG. 2, a plurality of gate bus lines 11 extend in the x-axis direction on the lower substrate 20, and the plurality of data bus lines 13 may extend in the y-axis direction substantially perpendicular to the x-axis direction. It extends to define the unit pixel space pix2. In this case, only one gate bus line 11 and one data bus line 13 are illustrated to represent the unit pixel space pix2. At this time, a gate insulating film (not shown) is interposed between the gate bus line 11 and the data bus line 13 to insulate the two lines.

The thin film transistor TFT2 serving as a switching element is provided near the intersection of the gate bus line 11 and the data bus line 13.

The pixel electrode 15 contacting the thin film transistor TFT2 is disposed in the unit pixel space pix2.

In addition, the storage electrode 17 is disposed in the unit pixel space pix1 to overlap the pixel electrode 15. The storage electrode 17 is in a straight line shape and is disposed in parallel with the gate bus line 11 between a pair of adjacent gate bus lines. By arranging the storage electrodes 17, short defects with the gate bus lines 11 can be reduced. Here, the storage electrode 17 is simultaneously formed of the same material as the gate bus line 11 and is located on the same plane. Accordingly, the pixel electrode 15 is insulated from each other with the gate insulating film interposed therebetween.

In addition, in the present embodiment, even if an open defect occurs in the data bus line 13, the repair line 18 of the data bus line is arranged to serve as the data bus line. The repair line 18 is disposed in one unit pixel space pix2 and is disposed in the upper gate bus line portion and the lower gate bus line portion, respectively, around the storage electrode 17. The repair line 18 is disposed on the same plane as the gate bus line 11, and has a first branch 18a parallel to the data bus line 13 and a data bus line from both ends of the first branch 18a. A pair of second branches 18b extending to overlap with 13). In this case, the first branch 18a and the second branch 18b may be disposed in a space between the data bus line 13 and the pixel electrode 15. The repair line 18 including the first branch 18a and the second branch 18b may be formed of the same material and process as the gate bus line 11, or may be formed of the same material as the data bus line. It may be formed by a separate process.

Here, the data bus line 13 generally has a straight shape, but is designed to have a relatively wide width at the portion overlapping with the storage electrode 17 and the repair line 18.

Thus, the liquid crystal display device with the repair line 18 is operated as follows.

First, when no open occurs in the data bus line 13, the repair line 18 is buried in the gate insulating film and does not function as an electrode line.

Meanwhile, when a predetermined portion of the data bus line 13 is opened and a disconnection occurs, a portion of the second branch 18b of the repair line 18 adjacent to the disconnected portion is welded to the laser. In this case, the portion for performing laser welding is more specifically an overlap point between the data bus line 13 and the second branch 18b. When the laser welding proceeds, the repair line 18b and the data bus line 13 contact each other. do.

Then, the signal applied to the data bus line is transmitted to the corresponding data bus line 13 via the first branch 18a of the repair line 18 without passing through the disconnected portion.

Therefore, the repair can be easily performed when the data bus line 13 is opened.

As described in detail above, according to the present invention, a repair line is formed between the data bus line and the pixel electrode on the same plane as the gate bus line, so that the repair can be easily performed when the data bus line is opened. .

At this time, the repair line is formed on the same plane as the gate bus line, and is spaced apart from the gate bus line and the storage electrode by a predetermined distance, and the short circuit defect can be reduced by being disposed with the gate insulating layer interposed between the data bus line and the data bus line. .

In addition, since the storage electrodes are formed in a straight line, short defects between the gate bus lines and the storage electrodes can be prevented.

Further, since the repair line is disposed between the data bus line and the pixel electrode, light leakage can be reduced.

In addition, this invention can be implemented in various changes within the range which does not deviate from the summary.

1 is a plan view of a lower substrate of a conventional liquid crystal display.

2 is a plan view of a lower substrate of a liquid crystal display according to the present invention;

(Explanation of symbols for the main parts of the drawing)

11-Gate Bus Line 13-Data Bus Line

15-pixel electrode 17-storage electrode

18-Repair Line 18a-First Branch

18b-2nd branch TFT2-thin film transistor

Claims (3)

Board; A plurality of gate bus lines and data bus lines disposed on the substrate in a matrix to define a unit pixel space; Switching elements disposed at intersections of the gate bus lines and the data bus lines, respectively; A pixel electrode connected to the switching element and disposed in an area surrounded by the gate bus line and the data bus line, respectively; A storage electrode formed in parallel with the gate bus line and overlapping the pixel electrode to form a storage capacitor; A gate insulating layer insulating the gate bus line and the storage electrode from the data bus line; And A repair line on the same plane as the gate bus line and the storage electrode and disposed at an upper gate bus line portion and a lower gate bus line with respect to the storage electrode line and formed at both ends thereof to overlap the data bus line; Liquid crystal display device comprising a. The liquid crystal display of claim 1, wherein the first branch and the second branch of the repair line are formed between the data bus line and the pixel electrode. The liquid crystal display of claim 1 or 2, wherein the repair line is formed of the same material and process as the gate bus line, or formed of the same material as the data bus line.