Floating electrode switching liquid crystal display

Details Floating electrode switching liquid crystal display Floating electrode switching liquid crystal display

2002-04-25

2004-09-28

Kim, Robert H. (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Having significant detail of cell structure only

Reexamination Certificate

active

06798483

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to a liquid crystal display (LCD). In particular, the present invention relates to a floating electrode switching liquid crystal display (FES-LCD).
2. Description of the Related Art
In-Plane Switching mode liquid crystal display (IPS-LCD) has been used or suggested in wide view angle display technology to improve a conventional twisted nematic liquid crystal display (TN-LCD).
FIG. 1
is a sectional view showing a conventional IPS-LCD. Liquid crystal molecules
160
are held between a color filter substrate
180
and a TFT (Thin Film Transistor) substrate
100
. Two common electrodes
120
are formed on the TFT substrate
100
, and an insulator layer
130
is deposited to cover the common electrodes
120
and the array substrate
100
. A pixel electrode
140
is positioned on the insulator layer
130
between the two common electrodes
120
, and a passivation layer
150
is covered over the pixel electrode
140
and the insulator layer
130
. An over coat layer
170
is formed on one side of the color filter substrate
180
, and the back ITO (Indium tin oxide) layer
190
is deposited on the other side of the color filter substrate
180
. When applying voltages to the common electrodes
120
and the pixel electrode
140
, in-plane electric fields E are generated to drive the liquid crystal molecules
160
rotating along the electric field. Therefore, the IPS-LCD can improve viewing angle, contrast ratio and luminescent efficiency. However, this conventional IPS-LCD still has following problems: low transmittance, image sticking problem and high cost color filter.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a floating electrode switching liquid crystal display (FES-LCD) to solve the problems caused by above conventional IPS-LCD.
This floating electrode switching liquid crystal display (FES-LCD) includes: a first substrate and a second substrate. A plurality of liquid crystal molecules held between the first substrate and the second substrate, the liquid crystal molecules are aligned to a first direction. A plurality of transverse-extending gate lines and lengthwise-extending signal lines formed on the first substrate to define a plurality of pixel areas being arranged in a matrix form. A plurality of pixel electrodes and floating electrodes formed on the first substrate, the pixel electrodes and the floating electrodes are positioned within the pixel areas, wherein the floating electrodes are positioned within each one of the pixel electrodes, the floating electrodes being arranged to a second direction and a third direction other than the second direction, the floating electrode are strip-shared, at least two adjacent floating electrodes are not parallel, the floating electrodes are spaced apart and arranged along the first direction, and for each pixel area, one line extends along a direction perpendicular to the first direction across only one floating electrode. A plurality of switching elements formed on the first substrate and within the pixel areas, each pixel area has at least one switching element, and the switching elements are connected to the pixel electrodes. A common electrode layer formed on the second substrate. Wherein, the pixel electrodes and the floating electrodes are separated in the same plane, and the first direction and the second direction or the third direction are intersected with an angle &thgr;.
According to this FES-LCD of the present invention, the transmittance is increased and the image sticking is improved. Moreover, because the FES-LCD can be fabricated using normal TN manufacturing method, the process of the FES-LCD is simplified. Further, because the color filter of the FES-LCD can uses normal color without back ITO and over coat layers, the cost of color filter is successfully decreased.


REFERENCES:
patent: 6356331 (2002-03-01), Ono et al.
patent: 6466288 (2002-10-01), Rho
patent: 6570638 (2003-05-01), Song
patent: 2002/0159016 (2002-10-01), Nishida et al.

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