Computer graphics processing and selective visual display system – Display driving control circuitry – Display power source
Reexamination Certificate
2007-04-17
2007-04-17
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Display driving control circuitry
Display power source
C345S212000, C345S213000, C345S204000, C345S205000
Reexamination Certificate
active
10950570
ABSTRACT:
A power supply circuit which generates a power supply for a circuit which drives a source electrode and a gate electrode provided in a display, includes a first booster circuit which outputs a third potential boosted based on a difference between first and second potentials, a potential regulator circuit which outputs a fourth potential being a constant potential generated based on a difference between the first and third potentials, and a second booster circuit which outputs a fifth potential boosted based on a difference between the first and fourth potentials. The first and fourth potentials are supplied to a source electrode driver circuit, and the first and fifth potentials are supplied to a gate electrode driver circuit. A voltage supplied to the gate electrode driver circuit may be generated by using a voltage conversion circuit. The voltage conversion circuit includes a capacitor which capacitively couples a sixth power supply line to which a negative constant potential based on a first potential is supplied and a node to which a polarity inversion timing signal of a common electrode is supplied, a negative power supply generating circuit which generates a negative output potential based on a booster potential which is the difference between a regulating potential and the first potential, and a switching element connected between the negative power supply generating circuit and the sixth power supply line. A timing signal and a switching control signal of the switching element change in synchronization with each other.
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Hjerpe Richard
Oliff and Berridge, PLC
Seiko Epson Corporation
Shapiro Leonid
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