Patent ID: 7903071
Filing Date: 2011-03-08
Classification: G09G,H03M

Abstract:
1. A driver IC for a display, the driver IC comprising: a first D/A converter including a first selection circuit which receives first image signals and supplies a selected positive divisional voltage of gray scale in accordance with the first image signals, and a first operational amplifier which receives the selected positive divisional voltage and supplies a positive pixel voltage by amplifying the selected positive divisional voltage; a second D/A converter including a second selection circuit which receives second image signals and supplies a selected negative divisional voltage of gray scale in accordance with the second image signals, and a second operational amplifier which receives the selected negative divisional voltage and supplies a negative pixel voltage by amplifying the selected negative divisional voltage; and a polarity switching switch including first and second switches connecting the first and second D/A converter respectively, the polarity switching switch being switched to supply each of output terminals corresponding to the first image signals and second image signals alternately with the positive pixel voltage and the negative pixel voltage every horizontal scan period by activating and inactivating the first and second switches in a complementary manner, wherein the first selection circuit includes a plurality of first switch circuits that are selectively activated in accordance with the first image signals to select one of a plurality of positive divisional voltages, each of the plurality of first switch circuits is provided with a logic switch function and has an ON resistance when activated, and the first selection circuit generates the selected positive divisional voltage by further dividing the selected one of the plurality of positive divisional voltages.