Gamma correction circuit using analog multiplier

Details Gamma correction circuit using analog multiplier Gamma correction circuit using analog multiplier

1996-06-03

1999-08-03

Peng, John K.

Television

Image signal processing circuitry specific to television

Gray scale transformation

348254, 348790, H04N 5202, H04N 969

Patent

active

059331992

ABSTRACT:
A gamma correction circuit for use in a liquid crystal display device includes a comparator that receives an input data voltage and preferably three reference voltages. In response to these signals, the comparator outputs an input data comparison signal, which is supplied to first and second analog switches. The first and second analog switches select and respectively output a weight voltage and a correction voltage in response to the input data comparison signal. The selected correction voltages is then either added or subtracted from the input data voltage, and the resulting sum or difference is multiplied by the selected weight voltage using an analog multiplier.

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