Computer graphics processing and selective visual display system – Display driving control circuitry
Patent
1998-06-03
2000-05-09
Hjerpe, Richard A.
Computer graphics processing and selective visual display system
Display driving control circuitry
G06F 300, G06F 1300, G09G 500
Patent
active
060610530
ABSTRACT:
The present invention provides an AGC (automatic gain control) device used in a displaying device such as an LCD projector for converting an analog color signal generated by a VGA card into a digital color signal. The AGC device comprises an A/D converter for converting the analog color signal into the digital color signal according to an upper reference voltage and a lower reference voltage, generating an overflow signal when the voltage of the analog color signal exceeds the upper reference voltage, and generating an underflow signal when the voltage of the analog color signal is below the lower reference voltage; and a feedback circuit for generating the upper and lower reference voltages. When receiving the overflow or underflow signal, the feedback circuit will increase the upper reference voltage or decrease the lower reference voltage so as to allow the A/D converter to completely convert the analog color signal into the digital color signal.
REFERENCES:
patent: 5210538 (1993-05-01), Kuroiwa
Hjerpe Richard A.
Hsu Winston
Mustek System Inc.
Nguyen Kevin M.
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