Liquid crystal cells – elements and systems – Particular excitation of liquid crystal – Electrical excitation of liquid crystal
Patent
1995-10-13
1999-05-04
Dang, Hung X.
Liquid crystal cells, elements and systems
Particular excitation of liquid crystal
Electrical excitation of liquid crystal
349 38, 349140, G02F 1136
Patent
active
058995480
ABSTRACT:
An insulated gate TFT (thin film transistor) liquid crystal pixel device driving circuit includes a supplemental capacitive element (condenser) that has the following two insulating films that is sandwiched between one electrode made of non-single crystal (semi-conductive) silicon and another electrode made of a conductor: (1) an insulating silicon-oxide film; (2) an insulating film made of the same material that was used for insulating the gate of the pixel TFT. The supplemental capacitive element is specifically provided with a thicker insulating film portion compared to that of the pixel TFT. Consequently, if the TFT gate insulating film is somehow subsequently thinned, the supplemental capacitive element is less susceptible to the occurrence of defects such as pin holes or the like. As a result, not only is the performance of the pixel TFTs upgraded, but also the reliability of the associated supplemental capacitive elements is increased. Thus, the method and apparatus in accordance with the present invention makes it possible to provide an inexpensive liquid crystal display device having improved performance over conventional TFTs combined with a greater reliability and an increased resistance of the supplemental capacitive elements to voltage spikes or the like.
REFERENCES:
patent: 4103297 (1978-07-01), McGreivy et al.
patent: 4648691 (1987-03-01), Oguchi et al.
patent: 5056895 (1991-10-01), Kahn
patent: 5182620 (1993-01-01), Shimada et al.
patent: 5317432 (1994-05-01), Ino
Dang Hung X.
Parker Kenneth
Sharp Kabushiki Kaisha
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