KR100590921B1 - Liquid crystal display - Google Patents

Abstract

The present invention discloses a liquid crystal display device capable of easily discharging static electricity accumulated in a data bus line and a redundancy line formed at a lower portion thereof. The disclosed invention includes an insulating substrate, a gate bus line disposed on the insulating substrate, a gate insulating film formed to cover the gate bus line and the insulating substrate, and a gate bus line formed on a predetermined portion of the gate insulating film. And a data bus line arranged to intersect, and a redundancy line formed below the data bus line, wherein the redundancy line is disconnected at a portion crossing the gate bus line.

Description

Liquid crystal display device

1 is a circuit diagram of a general liquid crystal display device.

2 is a plan view for explaining a redundancy line of a conventional data bus line.

3 is a cross-sectional view taken along line III-III ′ of FIG. 2.

4 is a plan view for explaining a data bus line redundancy line according to the present invention;

FIG. 5 is a cross-sectional view of FIG. 4 taken along line IV-IV '.

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

10-insulated substrate 11-gate bus line

12-gate insulating film 13-redundancy line

15-data bus line

The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device having a redundancy prevention redundancy line below the data bus line.

In general, the liquid crystal display device is expected to form a huge market as a next-generation display device, the liquid crystal display technology is also significantly developed, and the display performance of the display is greatly improved.

Among them, active matrix liquid crystal display panels have been rapidly developed, so that they are widely used in applications such as flat panel TV systems or high-information monitors for portable computers.

In the active matrix liquid crystal display, as shown in FIG. 1, a plurality of gate bus lines g1, g2, g3... And a plurality of data bus lines d1, d2, d3. , To define several unit pixel pix spaces.

Thin film transistors T are disposed at intersections of the gate bus lines g1, g2, and g3 and data bus lines d1, d2, and d3, respectively, and liquid crystal capacitors C _LC and drains of the thin film transistors. The storage capacitors C _ST are connected in parallel.

However, in such a liquid crystal display device, as the number of unit pixels increases, the number of crossings of the gate bus lines and the data bus lines increases, so that disconnection or shorting is likely to occur.

Conventionally, in order to prevent disconnection of the data bus line, as shown in FIGS. 2 and 3, a redundancy line r made of a transparent metal film is formed under the data bus line d. 2 is an enlarged view of a portion “x” of FIG. 1.

That is, the gate bus line g is formed on the insulating substrate 1, and the gate insulating film 2 is formed on the insulating substrate 1. Next, a transparent metal film and an opaque metal film are stacked on the gate insulating film 2, and then patterned to form a redundancy line r and a data bus line d.

When the redundancy line r is disposed below the data bus line d in this manner, even if the data bus line d is disconnected by a predetermined portion, the signal of the data bus line d is easily transmitted by the redundancy line r. do.

However, the method of forming the redundancy line below the data bus line causes the following problems.

That is, since the redundancy line r is in a floating state as is known, the static electricity generated in the liquid crystal display panel is continuously accumulated without transferring and discharging the static electricity generated by the short ring.

For this reason, when static electricity accumulates to a certain degree or more, a part of the conductive pattern bursts inside the cell, causing pattern breakage.

In addition, at the point where the gate bus line g intersects, the static electricity penetrates the gate insulating film 2 and flows to the gate bus line g, which causes a short between the gate bus line g and the data bus line d. .

Accordingly, an object of the present invention is to provide a liquid crystal display device which can easily discharge static electricity accumulated in a data bus line and a redundancy line formed below.

In order to achieve the above object of the present invention, according to an embodiment of the present invention, the present invention is formed to cover the insulating substrate, the gate bus line disposed on the insulating substrate, the gate bus line and the insulating substrate A gate insulating film, a data bus line disposed to intersect the gate bus line at a predetermined portion of the gate insulating film, and a redundancy line formed below the data bus line and disconnected at a portion crossing the gate bus line. do.

In addition, disconnected ends of the redundancy lines face each other in a triangular shape, and the redundancy lines are formed of an ITO film.

According to the present invention, in a liquid crystal display device including a redundancy line formed below the data bus line to prevent disconnection, at the portion crossing the gate bus line, the disconnection line is disconnected while the disconnection line is formed in a triangular shape, so that static electricity is generated. Discharge through disconnection.

Accordingly, pattern breakage caused by static electricity is prevented.

(Example)

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

4 is a plan view illustrating a data bus line redundancy line according to the present invention, and FIG. 5 is a cross-sectional view taken along line IV-IV ′ of FIG. 4.

Referring to FIG. 4, the gate bus line 11 extends in one direction on the insulating substrate 10, and the data bus line 15 extends in a direction substantially perpendicular to the gate bus line 11.

At the bottom of the data bus line 15, a redundancy line 13 is disposed to prevent disconnection of the data bus line 15.

Here, the redundancy line 13 of the present invention is disconnected at a portion intersecting with the gate bus line 11, and the disconnected portion is formed to have a triangular shape, and is different from the vertex portion of the triangle of the adjacent disconnected portion. It is arranged to correspond.

Referring to this in more detail through the cross-section, as shown in FIG. 5, the gate bus line 11 is formed on the insulating substrate 10. Next, a gate insulating layer 12 is formed on the insulating substrate 10 on which the gate bus lines 11 are formed. In this case, in order to minimize damage during electrostatic discharge, the gate insulating layer 12 uses a high dielectric constant insulating layer, for example, a laminated film of SiO ₂ / SiON / SiNx. Next, a redundancy line 13 is formed on the gate insulating layer 12 to intersect with the gate bus line 11. In this case, the redundancy line 13 is disconnected at the point where the redundancy line 13 intersects with the gate bus line 11, and is formed such that the planar shape of the end thereof is triangular. The data bus line 15 is formed on the redundancy line 13. Here, the data bus line 15 is arranged to extend without disconnection even at the intersection with the gate bus line 11.

When the redundancy line is configured in this way, since the static electricity accumulated in the redundancy line 13 is discharged at the disconnected portion, it is possible to prevent the pattern bursting due to the accumulation of static electricity.

Furthermore, since the disconnected portion of the redundancy line 13 is formed in a triangular structure, static electricity is discharged through the vertex portion of the triangle. Accordingly, the static electricity can be easily released.

In addition, by forming the redundancy line 13, disconnection of the data bus line 15 can be prevented.

As described in detail above, according to the present invention, in a liquid crystal display device including a redundancy line formed under the data bus line for preventing disconnection, the disconnection portion is disconnected while the redundancy line is disconnected at a portion crossing the gate bus line. In the form of a triangle, when the static electricity is generated to discharge through the disconnection.

Accordingly, pattern breakage caused by static electricity is prevented.

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

Claims (4)

With insulation board, A gate bus line disposed on the insulating substrate; A gate insulating film formed to cover the gate bus line and the insulating substrate; A data bus line disposed to intersect the gate bus line on a predetermined portion of the gate insulating layer; And a redundancy line formed under the data bus line and disconnected at a portion crossing the gate bus line. The liquid crystal display of claim 1, wherein disconnected ends of the redundancy lines face each other. The liquid crystal display device according to claim 1 or 2, wherein the redundancy line is formed of an ITO film. The liquid crystal display of claim 1, wherein the gate insulating film is formed of a laminated film of SiO ₂ / SiON / SiNx.

Images