Patent ID: 7116300

Claim:
A drive circuit, comprising: a plurality of digital-to-analog conversion circuits each of which selects one of difference reference voltages according to a digital gradation signal; and a sampling circuit which selectively connects each output terminal of two of the digital-to-analog conversion circuits to signal lines, wherein each of the digital-to-analog conversion circuits includes a variable resistor circuit with a resistance value corresponding to a digital gradation; and wherein the sampling circuit comprises a plurality of pairs of switches, and a pair of switches is simultaneously activated and have an approximate same resistance value when the pair of switches is activated; and wherein a divided voltage for outputting to a signal line is generated by a first series resistance and a second series resistance, the first resistance comprises a variable resistance circuit included in one of the digital-to-analog conversion circuits and one of the pair of switches, the one of the digital-to-analog conversion circuits is connected to the sampling circuit and the second series resistance comprises a variable resistor circuit included in another of the digital-to-analog conversion circuits and another of the pair of switches.