Patent ID: 8212754

Claim:
A grayscale voltage generating circuit comprising: a first voltage source for outputting a first voltage; a second voltage source for outputting a second voltage having a potential lower than that of the first voltage; a grayscale resistor having a first end and a second end connected to an output end of said first voltage source and to an output end of said second voltage source, respectively; and a circuit for detecting a difference voltage across said grayscale resistor from said first end to said second end of said grayscale resistor, converting the difference voltage to a current having a current value that corresponds to the difference voltage by passing said current through a voltage-to-current conversion resistor, and controlling output of a mirror current of said current through said voltage-to-current conversion resistor from first and second output terminals as a source current and a sink current, respectively, based on the difference voltage, wherein the first and second output terminals that output the source current and the sink current, respectively, are directly connected to the first and second ends of said grayscale resistor, respectively.