Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-11-08
2005-11-08
Chang, Kent (Department: 2675)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S099000
Reexamination Certificate
active
06963323
ABSTRACT:
A liquid crystal power supply is provided which generates a high-precision drive power supply voltage supplied to a driver circuit by using a low-precision reference voltage generating circuit. The power supply circuit includes a DC/DC converter which generates a voltage having a size based on an oscillation signal from a power supply voltage and outputs the generated voltage as a drive power supply voltage; a stabilized power supply circuit which generates a highest-level reference potential for generating a gray-scale voltage in a driver circuit; a comparison unit which outputs a difference voltage according to a difference between the drive power supply voltage and the highest-level reference potential; an internal reference voltage generating unit; an error amplifying unit which amplifies a difference between the reference voltage and the difference voltage; and a PWM conversion unit which outputs an oscillation signal in response to the amplified difference.
REFERENCES:
patent: 6127995 (2000-10-01), Furuhashi et al.
patent: 6331844 (2001-12-01), Okumura et al.
patent: 6518962 (2003-02-01), Kimura et al.
Karube Satoshi
Sakurai Takaaki
Watanabe Yoshiteru
Yana Toshiyuki
Anderson Jay H.
Chang Kent
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