Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2007-11-13
2007-11-13
Lefkowitz, Sumati (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S213000, C257S299000, C327S148000
Reexamination Certificate
active
11024713
ABSTRACT:
A charge-pump circuit includes: MOS transistors connected in series and having one end to which a system ground power supply voltage is supplied; and a discharge transistor. The discharge transistor has one end connected to a node which is connected to the MOS transistors, and the system ground power supply voltage is supplied to the other end of the discharge transistor. The MOS transistors are implemented by a triple-well structure formed in a p-type semiconductor substrate. When a normal operation is performed, the MOS transistors are turned ON and the discharge transistor is turned OFF. When a discharge operation is performed, the MOS transistors are turned OFF and the discharge transistor is turned ON, and a current path is formed by parasitic bipolar transistor elements.
REFERENCES:
patent: 2005/0156924 (2005-07-01), Nishimura
patent: A 2000-262045 (2000-09-01), None
patent: A 2004-180364 (2004-06-01), None
Lefkowitz Sumati
Oliff & Berridg,e PLC
Seiko Epson Corporation
Xiao Ke
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