Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
1998-08-28
2003-04-15
Dudek, James (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S143000
Reexamination Certificate
active
06549258
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a liquid crystal display device (LCD), and more particularly to a hybrid switching mode LCD.
2. Discussion of the Related Art
In a thin film transistor liquid crystal display device (TFT LCD), while it is desirable and required to make a large scale LCD, a problem exists in that the contrast ratio thereof changes according to a viewing angle. In order to solve this problem, various LCDs, such as twisted-nematic (TN) LCD including an optical compensation film and multi-domain LCD have been introduced. In these LCDs, however, problems still exist in that a contrast ratio is decreased and a color shift is generated according to a viewing angle.
For realizing a wide viewing angle, an in-plane switching mode liquid crystal display device (IPS LCD) is also being proposed.
FIG. 1A
is a plan view of a conventional IPS LCD. The IPS LCD comprises a data bus line
1
and a gate bus line
2
which are arranged on a first substrate to define a pixel region. A common bus line
5
is arranged parallel to the gate bus line
2
. A TFT is positioned at a crossing area of the data bus line
1
and the gate bus line
2
. Data electrodes
19
and common electrodes
11
are arranged parallel to the data bus line
1
.
FIG. 1B
is a sectional view taken along the line I—I of FIG.
1
A. As shown in
FIG. 1B
, the TFT comprises a gate electrode
10
which is connected to the gate bus line
2
on the first substrate
3
, a gate insulator
13
including SiN
x
or SiO
x
deposited on the gate electrode
10
, an amorphous silicon (a-Si) layer
15
formed on the gate insulator
13
, a n
+
a-Si layer
16
formed on the a-Si layer
15
, and source/drain electrodes
17
,
18
formed on the n
+
a-Si layer
16
, which are respectively connected to the data bus line
1
and data electrode
19
. The common electrode
11
in the pixel is connected with the common bus line
5
on the first substrate, and the data electrode
19
is connected with the drain electrode
18
of the TFT on the gate insulator
13
. On the TFT, data electrodes
19
, and gate insulator
13
, a passivation layer
20
including SiN
x
or SiO
x
is deposited over the substrate, and a first alignment layer (not shown in the figure) is formed thereon and alignment direction is determined.
Further, on a second substrate
4
, a light shielding layer
6
preventing light leakage, a color filter layer
7
having color filter elements of R, G, and B, and an overcoat layer
8
are formed in order.
In such conventional IPS LCD, however, there are voltage losses by the passivation layer between the data electrodes and the common electrodes and the gate insulator. Therefore, in order to drive liquid crystal molecules smoothly, a high voltage should be applied to the LC layer. Moreover, because the electrodes are formed on one substrate, such defects as cross talk and residual image occur. Also, because the common electrode is made with the same material as the gate electrode, for example, an opaque metal such as Cr, Ta, and the like, its transmittance ratio decreases.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a hybrid switching mode liquid crystal display device 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 hybrid switching mode LCD having a low driving voltage of an LC layer.
Another object of the present invention is to provide a hybrid switching mode LCD where at least a pair of electrodes which apply an in-plane and inclined electric field are formed on upper and lower substrates, respectively.
Another object of the present invention is to form transparent electrodes on one side of the substrate and improve the aperture ratio of the LCD.
Additional features and advantages of the invention will be set forth in the description which 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, the present invention provides a hybrid switching mode LCD (HS mode LCD) comprising a first substrate, forming at least a pair of electrodes applying an in-plane electric field, and a second substrate corresponding to the first substrate, forming a group of electrodes corresponding to the electrodes, so that a perpendicular and an inclined electric fields are applied between the substrates, and the driving voltage of an LC layer decreases.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.
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patent:
Kim Wook Sung
Park Jong Jin
Shin Hyun Ho
Dudek James
LG. Philips LCD Co. Ltd.
McKenna Long & Aldridge LLP
Nguyen Dung
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