Liquid crystal cells – elements and systems – Particular structure – Having significant detail of cell structure only
Reexamination Certificate
2000-03-30
2003-11-25
Ton, Toan (Department: 2871)
Liquid crystal cells, elements and systems
Particular structure
Having significant detail of cell structure only
C349S106000, C349S146000
Reexamination Certificate
active
06654090
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 multi-domain liquid crystal display device having a color filter layer with a window distorting electric field and a pixel electrode with a window inducing electric field and method of manufacturing thereof.
2. Description of the Related Art
Recently, a LCD has been proposed where the liquid crystal is not aligned, and the liquid crystals are driven by side electrodes insulated from pixel electrodes.
FIG. 1
is a sectional view of a pixel unit of conventional LCDS.
In the conventional LCD, a plurality of gate bus lines arranged in a first direction on a first substrate and a plurality of data bus lines arranged in a second direction on the first substrate divide the first substrate into a plurality of pixel regions. A thin film transistor (TFT) applies an image signal delivered from the data bus line to a pixel electrode
13
on a passivation layer
37
. The TFT is formed on each pixel region and comprises a gate electrode, a gate insulator, a semiconductor layer, a source electrode, a drain electrode, etc.
The passivation layer
37
is preferably formed over the whole first substrate. The pixel electrode
13
is coupled to the drain electrode on the passivation layer
37
. Side electrode
15
is formed in a region except a region where pixel electrode
13
is formed on the passivation layer
37
.
On the second substrate, a light shielding layer
25
is formed shielding light leakage from the gate bus line, data bus line, and TFT. A color filter layer
23
is on light shielding layer
25
. A common electrode
17
is on color filter layer
23
. A liquid crystal layer is between the first and second substrates.
In addition, an over coat layer
66
may be formed on the color filter layer
23
, the over coat layer
66
includes generally organic materials.
A side electrode
15
and an open area
27
of the common electrode
17
distort the electric field applied to the liquid crystal layer. Then, in a unit pixel, liquid crystal molecules are variously driven. This means that when voltage is applied to the LCD, dielectric energy due to the distorted electric field arranges the liquid crystal directors in a needed or desired position.
However, to obtain a multi-domain effect, open area
27
in common electrode
17
is necessary, which requires patterning of the common electrode
17
. Moreover, if the electrodes do not have an open area or the width thereof is narrow, the distortion of electric field needed to divide the pixel region becomes weak. Then, when voltage over a threshold voltage, V
th
, is applied, the time needed the liquid crystal directors to become stable increases.
Moreover, in the process of depositing and patterning the common electrode, since the common electrode
17
is formed directly on the color filter layer
23
or on the over coat layer
66
, the tackiness of the electrode decreases and then the uniformity of the open area decreases.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a liquid crystal display device that substantially obviates one or more problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a multi-domain LCD having a color filter layer with a window distorting electric field and a pixel electrode with a window inducing electric field and method of manufacturing thereof.
Another object of the present invention is to provide an organic or inorganic layer on the color filter layer so that it increases the tackiness of the electrode and the precision of the pattern.
A further object of the present invention is to provide a LCD having a wide viewing angle resulting from a multi-domain effect.
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 the objects and in accordance with the purpose of the invention, as embodied and broadly described herein, a multi-domain liquid crystal display device comprises includes first and second substrates facing each other; a liquid crystal layer between the first and second substrates; a plurality of gate bus lines arranged in a first direction on the first substrate and a plurality of data bus lines arranged in a second direction on the first substrate to define a pixel region; a thin film transistor positioned at a crossing area of the data bus line and the gate bus line, the thin film transistor comprising a gate electrode, a semiconductor layer, and source/drain electrodes; a pixel electrode on the first substrate, the pixel electrode having at least one window inducing electric field therein; a color filter layer on the second substrate, the color filter layer having at least one window distorting electric field therein; a common electrode on the color filter layer; and an alignment layer on at least one substrate between the first and second substrates.
In another aspect of the present invention, a method of manufacturing a multi-domain liquid crystal display device comprises the steps of providing first and second substrates facing each other; forming a pixel electrode on the first substrate, the pixel electrode having at least one window inducing electric field therein; forming a color filter layer on the second substrate, the color filter layer having at least one window distorting electric field therein; and forming a common electrode on the color filter layer.
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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Choi Jae Beom
Kim Kyeong Jin
Kwon Do Hee
Lee Yun Bok
Park Yong In
LG. Philips LCD Co. Ltd.
McKenna Long & Aldridge LLP
Qi Mike
Ton Toan
LandOfFree
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