Patent ID: 7327339

Claim:
An image display apparatus comprising: a display unit for displaying an image, and a drive unit for driving the display unit, the drive unit being connected by a plurality of signal lines, wherein: said display unit comprises a plurality of display pixels arranged in a matrix form and the signal lines are arranged in each column, and said drive unit comprises a ladder resistor, impedance converters each having an input connected to an output of the ladder resistor, gray level voltage wires each connected to the output of the impedance converters, gray level voltage selecting means selectively connecting said gray level voltage wires to said plurality of signal lines, wherein said impedance converters have an offset voltage canceling unit for detecting and eliminating any offset voltage between input and output, and wherein the number of said impedance converters matches the number of said gray level voltage wires and matches a number of a plurality of gray level voltage selectors of said gray level voltage selecting means connected to the gray level voltage wires.