Patent ID: 7541754

Claim:
A bias circuit for a display device to prevent and/or compensate a picture distortion, comprising: a controller that generates a plurality of control signals and each of the plurality of first control signals having a different duty cycle, and includes a plurality of comparators to output the plurality of first control signals, each comparator having a first input and a second input, wherein the first inputs of the plurality of comparators receive a same first signal and each of the second inputs of the plurality of comparators receives a second signal, and wherein the second signal input into each comparator has a different DC component which determines the duty cycle of a respective one of the first control signals; and a compensation circuit having a plurality of first switches, at least one main capacitor and a plurality of sub capacitors, a corresponding first switch provided between the main capacitor and a corresponding sub capacitor, wherein the plurality of first switches determine at least one of whether the main capacitor is coupled to the plurality of sub capacitors or whether the plurality of sub capacitors are coupled to each other, based on the plurality of first control signals.