Coded data generation or conversion – Analog to or from digital conversion – Digital to analog conversion
Reexamination Certificate
2005-10-11
2005-10-11
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Digital to analog conversion
C341S150000
Reexamination Certificate
active
06954166
ABSTRACT:
To provide a current generating circuit capable of generating an analog current having non-linear characteristic from linearly-instructed grayscale data with a small number of elements and a simple circuit structure, and an electro-optical device and an electronic apparatus employing the current generating circuit. A digital-to-analog conversion circuit section25can perform time-sharing processing by selectively turning on and off first to third selection signals S1to S3. In the first processing, electric charges corresponding to a first output current obtained by binary-weighting a reference current corresponding to a reference voltage Vref is stored in a storage capacitor Ch. In the second processing, by inputting a second output voltage Vout2corresponding to the electric charges stored in the storage capacitor Ch to the respective gates of the first to fourth driving transistors Qd1to Qd4, the digital-to-analog conversion is further performed using the first output current as the reference current. Therefore, it is possible to obtain an analog current output by raising the input image digital data D1to D4to the second power.
REFERENCES:
patent: 6067037 (2000-05-01), Kato
patent: 6498438 (2002-12-01), Edwards
patent: 6765560 (2004-07-01), Ozawa
patent: 2003/0227262 (2003-12-01), Kwon
Jean-Pierre Peguy
Oliff & Berridg,e PLC
Seiko Epson Corporation
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