Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
2003-04-29
2004-11-16
Chowdhury, Tarifur R. (Department: 2871)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S040000, C349S149000, C349S152000, C349S192000, C345S093000
Reexamination Certificate
active
06819370
ABSTRACT:
BACKGROUND OF INVENTION
1. Field of the Invention
The invention relates to a liquid crystal display (LCD) panel, and more particularly, to an LCD panel that has a repair line structure with a lower RC delay.
2. Description of the Prior Art
In a thin film transistor (TFT) LCD panel, a plurality of thin film transistors, which are formed in a matrix, are in combination with appropriate electric components, such as capacitors and binding pads, to drive liquid crystal pixels to produce a beautiful image. Because TFT LCD panels are small, have a light weight, consume less power, and do not produce radiation, TFT LCD panels are widely used in many portable information products, such as notebooks and PDAs, and replace the traditional CRT monitors of personal computers.
An ordinary TFT LCD panels contains an upper substrate with a color filter, a lower substrate, and a liquid crystal material filled between the upper substrate and lower substrate. The lower substrate has a plurality of scan lines (also called gate lines) thereon and a plurality of data lines (also called signal lines) thereon perpendicular with the scan lines. At the intersection of each of the scan lines and data lines are set at least a thin film transistor for use as a switch device of a pixel. On the lower substrate are further formed a plurality of repair lines for serving as replacing wires to send a signal to every thin film transistor correctly when there is a disconnection on a data line.
Please refer to
FIG. 1
, which is a schematic structure of an LCD panel
10
according to prior art. As shown in
FIG. 1
, an LCD panel
10
contains a substrate
12
, an X-axial printed circuit board (X-board)
14
and a Y-axial printed circuit board (Y-board)
16
, and a flexible printed circuit board (FPC)
29
for electrically connecting the X-board
14
and the Y-board
16
, wherein the X-board
14
and the Y-board
16
are used for transmitting signals to the substrate
12
to enable the LCD panel
10
to produce images. The LCD panel
10
further contains a plurality of tape carrier packages (TCPs)
18
for electrically connecting the X-board
14
and the substrate
12
, and a plurality of TCPs
20
for electrically connecting the Y-board
16
and the substrate
12
. Each TCP
18
or
20
contains an integrated circuit (IC) chip (not shown in FIG.
1
).
The substrate
12
has a plurality of scan lines S
1
-S
m
thereon and a plurality of data lines D
1
-D
n
thereon perpendicular with the scan lines S
1
-S
m
. The scan lines S
1
-S
m
and the data lines D
1
-D
n
are used for defining a plurality of pixels (not shown in
FIG. 1
) formed in matrix in an active region
26
on the substrate. Each of the scan lines S
1
-S
m
is electrically connected to its corresponding TCP
20
through a bonding pad
24
, and similarly, each of the data lines D
1
-D
n
is electrically connected to its corresponding TCP
18
through a bonding pad
22
. The substrate
12
further contains at least a repair line
28
. The repair line
28
is set on the X-board
14
, Y-board
16
, and the substrate
12
for repairing the data line D
1
-D
n
on the substrate
12
when there is a disconnection on a data line D
1
-D
n
. The method of repairing a data line is described below.
Please refer to
FIG. 2
, which is a schematic diagram of a method using a repair line to repair an LCD panel
10
according to prior art. If a disconnection occurs at the point A of the data line D
n
, the prior art method uses a laser welding to connect the terminals point B and C of the data line D
n
with the repair line
28
. Therefore a signal will pass through the path
30
to every pixel when the X-board
14
outputs a signal to the data line D
n
.
According to the prior art, the repair line
28
transversely crosses data line D
1
-D
n
, so it will cause an RC delay effect on the repair line. As a result, the effect of the RC delay will be greater when the size of the LCD panel
10
becomes larger and the RC delay will cause the distortion of the image signal on the panel finally. Therefore, how to distribute and set the repair line on the X-board, Y-board, or the substrate to reduce the RC delay becomes a main issue for improving the yield of manufacturing an LCD panel with a large size.
SUMMARY OF INVENTION
It is therefore a primary objective of the claimed invention to provide an LCD panel that has a repair line with a lower RC delay to solve the above-mentioned problem.
According to the claimed invention, the LCD panel contains a first substrate, at least two first printed circuit boards, and at least a repair line. The first substrate has a plurality of first conductive wires thereon, and the first conductive wires are arranged in parallel with each other along a first direction. Each of the first printed circuit boards is electrically connected to the first substrate respectively for outputting signals to the first conductive wires. In addition, the repair line contains a first portion positioned on the first substrate, a second portion positioned on each of the printed circuit boards, and a third portion positioned on a connective region located between each of the first printed circuit boards.
It is an advantage of the claimed invention that the LCD panel contains a connective region so that the repair line on each of the first printed circuit boards is capable of being connected in the connective region, wherein the connective region is set on the substrate, a flexible printed circuit (FPC), which electrically connects each of the first printed circuit boards, or a control board. If the connective region is set on the substrate of the LCD panel, the amount of the connectors for connecting two adjacent first printed circuit boards and the effect of the RC delay on the repair line will both be reduced. If the connective region is set on the FPC or a control board, the advantage is that the manufacturing process can be simplified.
These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.
REFERENCES:
patent: 5805246 (1998-09-01), Lee et al.
patent: 6023310 (2000-02-01), Kawamoto et al.
patent: 6111558 (2000-08-01), Jeung et al.
patent: 6111621 (2000-08-01), Kim et al.
patent: 6525718 (2003-02-01), Murakami et al.
patent: 2002/0003590 (2002-01-01), Ko et al.
patent: 2002061851 (2002-07-01), None
Chen Hsin-Hung
Chien Chin-Cheng
Sah Wen-Jyh
Chi Mei Optoelectronics Corporation
Chowdhury Tarifur R.
Hsu Winston
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