Patent ID: 7289092

Claim:
A liquid-crystal driver comprising: reference voltage generation means for generating 2 n levels of gradation display voltages corresponding to n-bit display data in accordance with a plurality of input reference voltages; and a DA conversion circuit for selecting a gradation display voltage corresponding to the input display data out of the 2 n levels of gradation display voltages; wherein the liquid-crystal driver is constituted so as to be able to output the selected gradation display voltage to a liquid-crystal panel through a plurality of output terminals, the reference voltage generation means has first voltage division means constituted so as to be able to generate the 2 n levels of gradation display voltages by resistance-dividing voltage differences between the reference voltages by a plurality of dividing resistors connected in series, second voltage division means constituted so as to be able to generate the 2 n levels of gradation display voltages by resistance-dividing voltage differences between the reference voltages by a plurality of auxiliary resistors connected in series, and switching means for mutually connecting the 2 n levels of gradation display voltages generated by the first voltage division means and the 2 n levels of gradation display voltages generated by the second voltage division means, and the switching means is turned on during the transient state period in which the DA conversion circuit responds and the first and second voltage division means operate.