Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Reexamination Certificate
1998-12-04
2001-10-09
Dudek, James A. (Department: 2871)
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
C349S126000
Reexamination Certificate
active
06300987
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to thin film transistor array panels for liquid crystal displays (referred as LCDs hereinafter).
(b) Description of the Related Art
One of outstanding displays is a thin film transistor liquid crystal display (referred as LCD hereinafter), and it is important to reduce a manufacturing cost and to improve a image quality.
To reduce the cost, the manufacturing process needs to be simple. One of the way is to reduce the number of masks which are used in the process.
Meanwhile, one of important factors which affect to the image quality of the TFT LCD is an aperture ratio. In other word, the more the aperture ratio is large, the more the image is bright and clear. The number of the pixels needs to be increased to realize high resolution image, but the aperture ratio is decreased when the display is fixed, since the widths of metal wires and the size of a thin film transistor are limited.
Generally, in a conventional liquid crystal display, the portion outside pixel electrodes is covered with a black matrix which is formed on one of two panels of the LCD.
However the step in which an additional mask is used to form the black matrix is required, and the consideration of the alignment margin causes to be decreased.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a TFT substrate for a liquid crystal display which can be manufactured in simple process, of which aperture does not become decreased, and in which light leakage effect is protected.
To achieve these objects of the present invention, instead of forming the black matrix, storage electrode lines cover the light leakage which occurs near a pixel electrode by forming the pixel electrode to overlap adjacent two storage electrode lines and a previous gate lines at the same time
In a thin film transistor array panel for a liquid crystal display according to the embodiments of the present invention, a plurality of gate lines are formed on an insulating substrate, a plurality of storage electrode lines to form a storage capacitance are formed on the insulating substrate and respectively arranged after respective gate lines. A plurality of data lines cross the gate lines and the storage electrode lines and are insulated with the lines. Thin film transistors having three electrodes are formed. Two of the electrodes are respectively connected to the gate line and the data line, and the rest of the electrodes is connect to a pixel electrode which overlaps adjacent two of the storage electrode lines and a gate line which is located between the two storage electrode lines at the same time.
The pixel electrode may overlap the data lines at the both edges, and an organic film as an insulating film may be formed between the pixel electrodes and the data lines.
The storage electrode lines may be connected to adjacent gate line in a couple, or not.
In a thin film transistor array panel for a liquid crystal display according to another embodiment of the present invention, a pixel electrode overlaps adjacent two of a plurality of storage electrode lines, a gate lines located between the two storage electrode lines, and data lines at the both edges. In this embodiment, the overlapping width of the pixel electrode and the storage electrode line and the date line at the side that the rubbing is started is wider than the overlapping width of the pixel electrode and the storage electrode line and the data line at the side that the rubbing is finished.
Since the edges of the pixel electrode are located over the storage electrode lines of data lines, the light leakage near the edges of the pixel electrodes is covered by wires such as the storage electrode lines or data lines without an additional black matrix. In addition, the light leakage is effectively covered by forming the overlapping width of the pixel electrode and the storage at the side where the light leakage widely occurred wider than the overlapping width at the opposite side.
REFERENCES:
patent: 5394258 (1995-02-01), Morin et al.
patent: 5459596 (1995-10-01), Ueda et al.
patent: 5822027 (1998-10-01), Shimada et al.
patent: 5877830 (1999-03-01), Shimada et al.
Dudek James A.
Howrey Simon Arnold & White , LLP
Samsung Electronics Co,. Ltd.
Schechter Andrew
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