Patent ID: 7176913

Claim:
A drive circuit for a flat display apparatus wherein driving signals are produced by a digital to analog conversion processing of image data and are used to drive signal lines of a display section wherein pixels are arranged in a matrix, comprising: an original reference voltage production circuit for producing a plurality of original reference voltages; a reference voltage production circuit including a resistor series circuit formed from a plurality of voltage dividing circuits connected in series and each including a plurality of resistors connected in series for receiving the original reference voltages at the opposite ends of and at nodes between said voltage dividing circuits of said resistor series circuit and outputting divided voltages by said voltage dividing circuits as a plurality reference voltages; and a driving signal digital to analog conversion circuit for receiving the reference voltages as inputs thereto and selectively outputting the inputted reference voltages in accordance with the image data for the corresponding ones of said signal lines as the driving signals; said reference voltage production circuit producing the reference voltages in a plurality of systems having different gamma characteristics; said driving signal digital to analog conversion circuit selecting the reference signals of one of the plural systems and selectively outputting the selected reference voltages in response to the image data.