Patent ID: 7586504

Claim:
A driving circuit of a display apparatus comprising: gray scale level voltage generating means for generating a plurality of gray scale level voltages; a plurality of gray scale level output circuits, provided to a plurality of output terminals of the gray scale level voltage generating means respectively, each of them having an operational amplifier for impedance-converting an input signal inputted via the output terminal of said gray scale level voltage generating means; selection means for, of output signals of the plurality of gray scale level output circuits, selecting a signal necessary for driving the display apparatus; and controlling means for controlling each of said plurality of gray scale level output circuits, wherein each of said plurality of gray scale level output circuits has storing means for storing in advance each of offset voltages generated in said operational amplifier according to the level of the gray scale level voltage of said input signal, and said controlling means controls each of said plurality of gray scale level output circuits to correct output of said operational amplifier by using said offset voltages stored in said storing means; and wherein said storing means of each of said plurality of gray scale level output circuits is comprised of a plurality of capacitors for storing said offset voltages respectively.