Array circuit of a liquid crystal display wherein common...

Details Array circuit of a liquid crystal display wherein common... Array circuit of a liquid crystal display wherein common...

2001-11-30

2004-05-04

Kim, Robert H. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

C349S141000, C349S039000, C345S087000, C345S090000

Reexamination Certificate

active

06731365

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display, particularly to an array structure of a liquid crystal display having two common electrodes.
2. Description of the Prior Art
FIG. 1
is a diagram showing a conventional array structure of a liquid crystal display. There are four pixel regions on a substrate
10
. Each scan line
102
is electrically connected to gates of transistors
101
in one line of pixel regions through via holes (not shown). Each data line
103
is electrically connected to sources of the transistors
101
in one row of pixel regions through via holes. Each pixel electrode
201
has a connector
2011
electrically connected to drains of the transistors
101
and extended portions
2012
extending from the connector
2011
. A common electrode
104
has connectors
1041
along with the lines of the pixel regions and extended portions
1042
extending from the connectors
1041
. The transistors
101
are positioned where the extended portions
1042
extend from the connectors
1041
of the common electrode
104
. Capacitances are formed between the extended portions
2012
and
1042
respectively of the pixel electrodes
201
and the common electrode
104
.
FIG. 2
is a diagram showing an equivalent circuit of the conventional transistor array of the liquid crystal display. The same symbols are used in FIG.
1
and FIG.
2
. The circuit comprises the transistors
101
, the scan lines
102
connected to the gates of lines of the transistors
101
, the data lines connected to the sources of rows of the transistors
101
, the common electrode
104
and the capacitances
105
formed between the drains of the transistors
101
and the common electrodes
104
.
However, all the pixel regions of the conventional transistor array structure have the same common electrode voltage since they have the same common electrode. It is impossible to apply two different common electrode voltages to the pixel regions. Thus, any driving method using two different common electrode voltages cannot be implemented by a conventional circuit.
SUMMARY OF THE INVENTION
Therefore, the object of the present invention is to provide an array structure of a liquid crystal display having two common electrodes isolated from each other.
The other object of the present invention is to provide two different driving voltages to drive the two isolated common electrode in the array structure. The two different driving voltages comprise a positive and negative voltage.
The present invention provides an array structure of a liquid crystal display. The circuit comprises a substrate having a first and a second pixel region thereon. Each of the pixel regions has a transistor, a pixel electrode electrically connected to a drain of the transistor and a common electrode forming a capacitance with the pixel electrode, wherein the common electrodes of the first and second pixel regions are electrically isolated from each other.
The present invention further provides an array structure of a liquid crystal display comprising a substrate having a first and a second pixel region thereon. Each of the pixel regions has a transistor, a pixel electrode electrically connected to a drain of the transistor, and a common electrode having an extended portion forming a capacitance with the pixel electrode and a connector which the extended portion extends from, wherein the common electrodes of the first and second pixel regions are isolated from each other, and the transistors are positioned where the extended portions extending from the connectors.


REFERENCES:
patent: 4728172 (1988-03-01), Cannella
patent: 4728175 (1988-03-01), Baron
patent: 6177988 (2001-01-01), Dubnack et al.
patent: 2001/0052951 (2001-12-01), Ashizawa et al.
patent: 2000-305063 (2000-11-01), None

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