Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Patent
1996-03-11
1998-05-05
Sikes, William L.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
349106, 349110, 349139, 349155, 349187, G02F 11339, G02F 11343
Patent
active
057482667
ABSTRACT:
To prevent a signal delay of an active-matrix liquid crystal display from occurring in an active-matrix liquid crystal display having an active element for each pixel electrode, a potential is supplied to a common electrode from a storage capacitance line by forming a pillar of a color filter to specify a cell gap between an array substrate having the storage capacitance line and a facing substrate having the color filter and electrically connecting the common electrode covering the pillar of the color filter with the storage capacitance line on the array substrate. Thereby, it is possible to disuse a transfer dotting process which is a factor of decreasing the yield and also a factor of decreasing the effective display area. Moreover, because the potential is supplied to the common electrode from the storage capacitance line, it is possible to prevent a signal delay of the common electrode from occurring and moreover realize a high-image-quality screen even in a large and high-definition liquid crystal display without causing irregularity of a display screen or decrease of a contrast ratio. Furthermore, because it is possible to disuse a spacer scattering process and specify a cell gap by securing the pillar of the color filter, not only the cell gap is kept constant at any place and the uniformity of the screen is maintained but also spacers do not brighten or the screen is not blackened due to coagulation of the spacers and the image quality is improved. Furthermore, the cost can be decreased because the transfer dotting process and the spacer scattering process are unnecessary.
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Drumheller Ronald L.
Duong Tai V.
International Business Machines - Corporation
Sikes William L.
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