Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2005-06-21
2005-06-21
Eisen, Alexander (Department: 2674)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S690000
Reexamination Certificate
active
06909414
ABSTRACT:
Disclosed is a driver circuit, as well as a LCD device having the driver circuit, in which changeover between first and second buffer circuits the operating ranges of which extend to high- and low-potential power supply voltages can be performed reliably within the drive changeover range. The driver circuit includes first and second buffer circuits having their input terminals connected in common with one input terminal to which an input signal voltage is input and having their output terminals connected in common with an output terminal, the first and second buffer circuits having operating ranges that extend to high- and low-potential power supply voltages, respectively; first and second storage units for storing respectively positive- and negative-polarity reference data, which correspond to voltages within a range in which both of the first and second buffer circuits are operable, with regard to each of a standard state and modulated state of a gamma characteristic; a selector for selecting either of the storage units based upon a polarity signal, and selectively outputting reference data corresponding to the standard or modulated state based upon modulation information that specifies modulation; and a comparator for comparing entered data and the reference data output from the selector. Activation and deactivation of the first and second buffer circuits is controlled based upon an output signal from the comparator and a control signal.
REFERENCES:
patent: 5694225 (1997-12-01), Suzuki
patent: 6567066 (2003-05-01), Hashimoto
patent: 2000-338461 (2000-12-01), None
“A New Low-Power Driver for Portable Devices,” by H. Tsuchi, N. Ikeda and H. Hayama, SID 00 DIGEST pp. 146-149.
Tsuchi Hiroshi
Uchiyama Yoshinori
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