Patent ID: 6680733
Filing Date: 2004-01-20
Classification: G09G

Abstract:
A gamma voltage circuit for a liquid crystal display comprising:a programmable digital-to-analog converter (DAC) having a predetermined number of first set of outputs, wherein the programmable DAC is configured to output a first plurality of analog reference voltage signals in response to a corresponding plurality of digital control signals input thereto, wherein each of the first plurality of analog reference voltage signals appears on a corresponding one of the first set of outputs; and a gamma voltage controller connected to the first set of outputs to generate a second plurality of analog reference voltage signals by dividing the first plurality of analog reference voltage signals, wherein the gamma voltage controller includes a plurality of voltage divider networks with a second set of outputs, wherein each voltage divider network in the plurality of voltage divider networks has a first input and one of the second set of outputs, and wherein each the first input is connected to a corresponding one of the first set of outputs and each of the second set of outputs is connected to a column driver circuit for the liquid crystal display.