Patent ID: 7079127

Claim:
A reference voltage generation circuit which generates multi-valued reference voltages for generating grayscale values which are gamma-corrected based on grayscale data, comprising: a ladder resistance circuit which comprises a plurality of resistance circuits connected in series between first and second power supply lines to which first and second power supply voltages are respectively supplied, and outputs voltages of first to ith (i is an integer of two or more) divided nodes, which are formed by dividing the ladder resistance circuit by the resistance circuits, as first to ith reference voltages; a first impedance variable circuit which changes a first impedance value which is an impedance between jth (j is a natural number) divided node and the first power supply line; and a second impedance variable circuit which changes a second impedance value which is an impedance between kth (1≦j<k≦i, k is an integer) divided node and the second power supply line, wherein the first and second impedance variable circuits decrease the first and second impedance values during a given control period in a drive period based on the grayscale data, and wherein the first and second impedance variable circuits return the first and second impedance values to given first and second values after the control period has elapsed.