Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
1999-11-05
2001-12-04
Ton, Toan (Department: 2871)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S192000
Reexamination Certificate
active
06327007
ABSTRACT:
This application claims the benefit of Korean Patent Application No. 1998-47625, filed on Nov. 7, 1998, which is hereby incorporated by reference for all purposes as if fully set forth herein.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display (LCD) device, and more particularly, to an array panel of the LCD device with a repair structure.
2. Description of the Related Art
In general, a liquid crystal display (LCD) device displays an image using a plurality of pixels. The LCD device having a thin film transistor (TFT) as a switching element is typically called a thin film transistor liquid crystal display (TFT-LCD) device.
The TFT as the switching element has a gate electrode, a source electrode and a drain electrode. The gate and source electrodes of the TFT are connected to gate and data lines, respectively. Through the gate line, a pulse voltage is applied to operate the gate electrode, and through the data line, a signal voltage is transmitted to operate the source electrode.
The LCD device has a plurality of pixels, each of which is operated by a corresponding switching element that is driven by the gate and data lines.
The plurality of pixels and the TFTs are formed in a microstructure, and it is very important to form the gate and data lines and other components of the TFTs uniformly. In a display device, therefore, even a small particle may cause a point defect such as a pixel defect and a line defect such as an open gate and/or data lines.
Such defects have become serious problems with the increase in the display area of the image device. To solve the problems, a redundant design or repair structure has been introduced. The redundant design or repair structure is more needed for repairing a line defect than a point defect, since a point defect can be repaired without severely damaging the product. However, even one line defect may deteriorate the value of the product. Thus, a redundant design for the line defect has been developed.
FIG. 1
shows a conventional repair structure for a line defect of a TFT-LCD device. An active display region
17
with a plurality of pixels is located on a substrate of a liquid crystal display (LCD) device. A plurality of gate lines
11
are arranged in a transverse direction and a plurality of data lines
13
are arranged in a longitudinal direction. A repair line
15
is located outside the active display region
17
in order to repair an open data line. When one of the data lines
13
is opened, the repair line
15
is connected to the open line at two cross points SP
1
and SP
2
. Then, the data signal flows toward a source electrode along a path in the repair line
15
.
FIG. 2
shows a modified conventional repair structure of
FIG. 1
, and
FIG. 3
shows another conventional repair structure. In
FIGS. 2 and 3
, the same method as in
FIG. 1
is used to repair the line defect.
However, the conventional repair structures have the following disadvantages. Since the repair line
15
is formed outside the active display region
17
in
FIGS. 1
,
2
and
3
, the length of the path of the repair line
15
along which the gate or data signals must flow is long. Thus, a resistance of the repair line
15
increases causing signal loss and signal delay. In addition, crosstalk at the affected area of the LCD device resulting from a parasitic capacitance generated at a crossing portion of the repair line and the gate or data line is large.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a liquid crystal display array panel having a repair structure that substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a repair structure having a reduced or minimum length of the path in repairing opened gate or data lines.
Additional features and advantages of the invention will be set forth in the description with follows, and in part will be apparent from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
To achieve these and other advantages and in accordance with the purpose of the present invention, as embodied and broadly described, a liquid crystal display array panel includes a substrate; a plurality of gate lines on the substrate; a plurality of data lines on the substrate extending transverse to the plurality of gate lines; an active display region having a plurality of pixels defined by the plurality of gate lines and data lines; at least two repair lines partially positioned on the active display region and separated from each other; and wherein the repair lines cross some of the plurality of gate lines and all the data lines.
The repair lines are in the form of a rectangular closed loop, each having first and second transverse lines spaced from each other, and first and second longitudinal lines for connecting the first and second transverse lines. The rectangular closed loop repair lines are spaced from and parallel to each other. At least one of the transverse lines of the repair line is positioned under one of the plurality of gate lines with a first insulating layer therebetween. The transverse line under the gate line has a protrusion in a first region under the data line other than a second region where the gate line covers. Further, a liquid crystal display array panel includes a connection bar extending over corresponding longitudinal lines of the adjacent repair lines while a second insulating layer lies between the connection bar and the repair lines.
REFERENCES:
patent: 5303074 (1994-04-01), Salisbury
patent: 5608245 (1997-03-01), Martin
patent: 5729309 (1998-03-01), Na et al.
patent: 5859679 (1999-01-01), Song
patent: 6014191 (2000-01-01), Kim et al.
LG. Philips LCD Co. Ltd.
Long Aldridge & Norman LLP
Schechter Andrew
Ton Toan
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