Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2000-09-07
2003-02-04
Dudek, James (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S140000
Reexamination Certificate
active
06515728
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a liquid crystal display, and more particularly to a multi-domain liquid crystal display device that is adapted to improve an aperture ratio and a view angle.
2. Description of the Related Art
Generally, a liquid crystal display (LCD) tends toward wider applications by virtue of its characteristics such as lightweight, thin thickness and low power consumption, etc. Accordingly, the LCD has been used for office automation equipment and video/audio equipment, etc. The LCD controls a transmitted amount of light in response to a data signal applied to a plurality of control switches arranged in a matrix to display a desired picture on a screen.
However, the LCD has drawbacks in that a viewing angle is narrow and that a displayed picture quality is considerably deteriorated when viewed from a side direction thereof. In order to solve these problems, there have been made various studies for assuring a wide viewing angle. Accordingly, a multi-domain method has been suggested as a result of such studies. This multi-domain method uses an orientation control electrode for controlling orientation of liquid crystal cells in a different direction for each sub-pixel area (i.e., domain) for each pixel. Each pixel is divided into at least two sub-pixel areas. Such an orientation control electrode is formed in such a manner to surround the periphery of the pixel electrode to control an electric field applied to the liquid crystal, thereby adjusting an orientation of the liquid crystal in a plurality of orientation directions. A multi-domain LCD device provided with the orientation control electrode will be described below with reference to FIG.
1
and FIG.
2
.
FIG. 1
is a plan view showing a structure of a conventional multi-domain LCD device. In
FIG. 1
, when a scanning signal transmitted from a gate wire
16
is applied to a gate electrode
20
, a data signal applied, via a data wire
6
, to a source electrode
8
is transmitted to a drain electrode
18
. The multi-domain LCD device having the structure as shown in
FIG. 1
is provided with an orientation control electrode
14
surrounding the periphery of a pixel electrode
12
so as to implement a multi-domain. A cross-section taken along line A-A′ of
FIG. 1
will be described in detail in conjunction with FIG.
2
.
As shown in
FIG. 2
, a gate insulator
4
, a data wire and a protective film
10
are formed at the upper portion of a first substrate
2
. The upper portion of the protective film
10
is provided with the orientation control electrode
14
. Since the pixel electrode
12
provided at the protective film
10
is a real areas to which a light beam is transmitted, it consists of a transparent electrode made from a transparent conductive material. The orientation control electrode
14
is supplied with Vcom to control an electric field applied to the liquid crystal, thereby adjusting an orientation of the liquid crystal. Accordingly, the conventional LCD device has the orientation control electrode
14
formed at the periphery of the pixel electrode
12
to implement a multi-domain, thereby widening a view angle. Since it is difficult for the orientation control electrode
14
to provide a uniform orientation direction, a deteriorated viewing angle may be caused. Also, since each pixel is provided with an opaque orientation control electrode
14
at the periphery of the pixel electrode
12
, a light-transmitted area of each pixel by an amount of space equal to the area occupied by the control electrode
14
. This causes a problem of reducing an aperture ratio of each pixel.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a multi-domain liquid crystal display device that is capable of improving aperture ratio as well as viewing angle.
In order to achieve these and other objects of the invention, a multi-domain liquid crystal display device according to an embodiment of the present invention includes a first pixel electrode connected to a drain electrode; a second pixel electrode formed to surround the periphery of the first pixel electrode; and a resistor formed between the first and second pixel electrodes.
A multi-domain liquid crystal display device according to another embodiment of the present invention includes a first pixel electrode connected to a drain electrode; a second pixel electrode formed to surround the periphery of the first pixel electrode; and a transparent electrode formed between the first and second pixel electrodes to have a desired resistance value.
A multi-domain liquid crystal display device according to still another embodiment of the present invention includes a first pixel electrode connected to a drain electrode; a second pixel electrode formed to surround the periphery of the first pixel electrode; and a semiconductor layer formed between the first and second pixel electrodes to have a desired resistance value.
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Chung In Jae
Song In Duk
Dudek James
LG.Philips LCD Co. , Ltd.
McKenna Long & Aldridge LLP
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