KR20000003745A - Liquid crystal display - Google Patents

Abstract

PURPOSE: A liquid crystal display is provided to easily repair when a gate bus line and a data bus line are short each other. CONSTITUTION: The liquid crystal display comprises: a substrate(20); a plurality of gate bus lines(11) arranged to a first direction of the substrate; a plurality of data bus lines(13) arranged to a second direction actually vertical with the first direction, and for limiting a unit pixel; a thin film transistor(TFT) formed in the neighbor of a cross of the gate bus lines and data bus lines; a pixel electrode(17) contacted with the thin film transistor, and formed with each unit pixel; and a storage electrode(11b) overlapped with the pixel electrode, and prolonged from the gate bus line to the gate bus line of next stage, wherein the storage electrode is formed at both sides of the data bus line and has different length with the data bus line each other, and the liquid crystal display comprises a pair of branches prolonged parallel with the data bus lines and a bridge for connecting an end of the short branch with relatively long branch.

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 that can be easily repaired when a short circuit occurs between a gate bus line and a data bus line while improving an aperture ratio.

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

Referring to the drawings, the gate bus line 1 and the data bus line 2 are cross-arranged on the glass substrate 10 to define the unit pixel space P. As shown in FIG. At this time, a gate insulating film (not shown) is interposed between the gate bus line 1 and the data bus line 2. The gate bus line 1 includes a first protrusion 1a that protrudes into the unit pixel space P, and a second protrusion 1b that protrudes outside the unit pixel P. Here, the first protrusion 1a becomes a gate electrode of the thin film transistor, and the second protrusion 1b becomes a storage electrode. Here, the storage on gate method is illustrated in this drawing, in which the storage electrode is integrated with the front gate bus line 1.

In addition, the data bus line 2 protrudes a predetermined portion so that the data bus line 2 can overlap the predetermined portion with the gate electrode 1a, and this portion becomes the drain electrode 2a of the thin film transistor. The source electrode 3 overlaps the gate electrode 1a at a portion symmetrical with the drain electrode 2a. The pixel electrodes 4 are disposed in the unit cell space, respectively. In this case, the pixel electrode 4 is in contact with the source electrode 3 overlapping with the gate electrode 1a by a predetermined portion, and the storage electrode Cb is formed by overlapping with the storage electrode 1b. Here, a gate insulating film (not shown) is interposed between the pixel electrode 4 and the storage electrode 1b.

An upper substrate (not shown) facing the lower substrate 1 is provided with a color filter so as to correspond to the pixel electrode 4, and a black matrix for blocking leakage light is disposed at the edge of the color filter. At this time, the black matrix is installed to include the edge of the color filter in order to more completely block the edge leakage light.

However, the liquid crystal display of the above structure has the following problems.

First, the storage electrode 1b protrudes into the unit pixel electrode 4 in order to maintain a constant capacitance. For this reason, the aperture ratio of a liquid crystal display device falls.

Moreover, when the upper and lower substrates are bonded, misalignment may occur, so that the black matrix of the upper substrate is designed with a predetermined margin in consideration of misalignment. Accordingly. The aperture ratio is further lowered.

Secondly, since the gate bus line 1 and the data bus line 2 are arranged crosswise, there is a high risk that a short will occur at the crossed portion. As a result, a line defect may be generated on the screen, or a problem that may be discarded if severe.

Accordingly, an object of the present invention is to provide a liquid crystal display device which can be easily repaired during short circuit between the gate bus line and the data bus line while improving the aperture ratio.

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 11b: storage electrode

11b-1,11b-2: Branch 11b-3: Bridge

13: data bus line 15: channel layer

17: pixel electrode

In order to achieve the above object of the present invention, a liquid crystal display according to an embodiment of the present invention, a substrate, several gate bus lines extending in a first direction of the substrate, substantially perpendicular to the first direction A plurality of data bus lines extending in a second direction to define unit pixels, thin film transistors formed near intersections of the gate bus lines and data bus lines, pixels in contact with the thin film transistors and disposed in respective unit pixels And a storage electrode overlapping with the pixel electrode and extending from the gate bus line in a direction toward a next gate bus line, wherein the storage electrodes have different lengths while being disposed on both sides of the data bus line. A pair of branches extending parallel to the line and the shorter branches It characterized in that it comprises a bridge connecting the ends of the teeth and the relatively long branch.

According to the present invention, when forming a storage electrode integrally formed with a front gate bus line, the storage electrode includes a pair of branches parallel to the data bus line and a bridge connecting the branches on both sides of the data bus line. Form. Accordingly, the storage electrode is consequently positioned outside the pixel electrode, so that the storage electrode itself serves as a black matrix. Therefore, it is not necessary to provide a separate margin to the black matrix, and since the storage electrode does not occupy the pixel electrode region, the aperture ratio is greatly improved.

When a short occurs near the intersection of the gate bus line and the data bus line, that is, when the gate bus line portion and the data bus line between the branches are shorted, the gate bus line portion between the branches is cut, and the bridge portion and the data are cut off. When the bus line is shorted, the branch portion can be cut and repaired.

(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, the gate bus line 11 and the data bus line 13 are cross-aligned on the substrate 20 to define a unit pixel space pix. More specifically, the unit pixel space pix includes a pair of gate bus lines 11 and a pair of data bus lines 13. In the present embodiment, for example, a pair of gate buses The lower one of the lines 11 selects the unit pixel, and the lower one of the pair of data bus lines 13 transmits the display signal to the corresponding unit pixel. At this time, a gate insulating film (not shown) is interposed between the gate bus line 11 and the data bus line 13.

In addition, the gate bus line 11 has the first protrusion 11a extending one by one per unit pixel and the second protrusion 11b extending toward the next gate bus line side toward the unit pixel space selected by the gate bus line 11. Include.

Here, the first protrusion 11 is provided in the vicinity of the intersection with the data bus line 13, and this portion becomes the gate electrode of the thin film transistor to be described later.

The second protrusion 13b is a storage electrode, and the protrusions 13b are disposed on both sides of each data bus line 13 and have a different length and extend in parallel with the data bus line 13. Branch 11b-1 and 11b-2, and a bridge 11b-3 connecting the ends of the shorter branch 11b-1 to the relatively long branch 11b-2. . Here, the bridges 11b-3 are disposed in the direction orthogonal to the branches 11b-1 and 11b-2. Accordingly, a branch 11b-2 having a relatively long length is disposed at the left boundary portion of the unit pixel space pix, and a branch 11b-1 having a relatively short length is disposed at the right boundary portion. Therefore, in one pixel, the storage electrode has a branch 11b-2 having a relatively long length on the left data bus line 12 side, and a branch having a relatively short length on the right data bus line 12 side. 11b-1 and the front gate bus line 11;

At this time, both the first protrusion 11a and the second protrusion 11b including the gate bus line 11 are formed of an opaque metal film.

In addition, the channel layer 15 is disposed on the first protrusion 11a, which is a gate electrode, and the source electrode 13a protrudes from the data bus line 13 so as to overlap one side of the channel layer 15. The drain electrode 13b is disposed to overlap the other side of the channel layer 15, thereby forming a thin film transistor TFT.

Each of the unit pixel spaces pix overlaps the front gate gate line 11 and the branches 11b-1 and 11b-2 positioned at the left and right boundary portions of the unit pixel space pix, and contacts the drain electrode 13b. The pixel electrode 17 is formed as much as possible.

A gate insulating film is interposed between the pixel electrode 17, the front gate bus lines 11, and the branches 11b-1 and 11b-2 located at the left and right boundaries of the unit pixel space pix, and a storage capacitor therebetween. Is formed.

In addition, the branches 11b-1 and 11b-2 not only serve as storage electrodes, but also adjacent to data bus lines, and thus also serve as black matrices. This eliminates the need for margin misalignment when designing the black matrix in the data bus line direction on the upper substrate.

In addition, the portion where the branches 11b-1 and 11b-2 are formed is a portion where a black matrix has been conventionally installed, and since there is no region deeply invading toward the pixel electrode 17 like the conventional storage electrode, the aperture ratio This is greatly improved.

In addition, when a short occurs at the intersection of the gate bus line 11 and the data bus line 13, the portion of the gate bus line 11 or the bridge 11b-3 between the branches 11b-1 and 11b-2. By selectively cutting) and repairing, problems such as line defects can be improved.

As described in detail above, according to the present invention, in forming a storage electrode integrally formed with a front gate bus line, the storage electrode includes a pair of branches parallel to the data bus line on both sides of the data bus line, It is formed to include a bridge connecting the branches. Accordingly, the storage electrode is consequently positioned outside the pixel electrode, so that the storage electrode itself serves as a black matrix. Therefore, it is not necessary to provide a separate margin to the black matrix, and since the storage electrode does not occupy the pixel electrode region, the aperture ratio is greatly improved.

When a short occurs near the intersection of the gate bus line and the data bus line, that is, when the gate bus line portion and the data bus line between the branches are shorted, the gate bus line portion between the branches is cut, and the bridge portion and the data are cut off. When the bus line is shorted, the branch portion can be cut and repaired.

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

Claims (2)

Board; Several gate bus lines extending in a first direction of the substrate; Several data bus lines extending in a second direction substantially perpendicular to the first direction to define a unit pixel; A thin film transistor formed near an intersection point of the gate bus line and the data bus line; A pixel electrode in contact with the thin film transistor and disposed in each unit pixel; A storage electrode overlapping the pixel electrode and extending in a direction from a gate bus line to a next gate bus line; The storage electrode is disposed on both sides of the data bus line and has a different length and connects a pair of branches extending in parallel with the data bus line, and between the end of the short branch and a relatively long branch. Liquid crystal display device comprising a bridge. The liquid crystal display of claim 1, wherein the bridge is disposed in a direction orthogonal to the branch.