Patent ID: 8018475

Claim:
A driver circuit comprising: a channel amplifier configured to operate in a first mode to provide a channel amplifier output including a positive offset voltage responsive to a first state of a first control signal during a first frame time and configured to operate in a second mode to provide the channel amplifier output including a negative offset voltage responsive to a second state of the first control signal during a second frame time; a gamma amplifier coupled to an input of the channel amplifier, the gamma amplifier configured to operate in non-inverting mode to provide a gamma output including a positive offset voltage responsive to a first state of a second control signal and configured to operate in inverting mode to provide the gamma output including a negative offset voltage responsive to a second state of the second control signal; a first switch coupled to first and second inputs of the channel amplifier, the first switch configured to provide an input voltage to the first input and feedback the channel amplifier output to the second input in the first state of the first control signal and configured to provide the input voltage to the second input and feedback the channel amplifier output to the first input in the second state of the first control signal; and a second switch coupled to first and second inputs of the gamma amplifier, the second switch configured to provide an input voltage to the first input and feedback the gamma amplifier output to the second input in the first state of the second control signal and configured to provide the input voltage to the second input and feedback the gamma amplifier output to the first input in the second state of the second control signal, wherein the first control signal operates at a first frequency and the second control signal operates at a second frequency that is about one half the first frequency.