Patent ID: 8446403
Filing Date: 2013-05-21
Classification: G09G

Abstract:
1. A decoder receiving first and second reference voltage groups from a reference voltage generation circuit that outputs said first and second reference voltage groups belonging respectively to first and second voltage sections not overlapping each other, selecting a reference voltage from among said first and second reference voltage groups in accordance with a received digital signal and outputting a selected reference voltage, said decoder including: a first sub-decoder receiving said first reference voltage group and selecting and outputting a reference voltage to an output terminal of said decoder, said first sub-decoder comprising a plurality of switches, each which includes a first transistor of a first conductivity type having a back gate supplied with a first power supply voltage; a second sub-decoder receiving said second reference voltage group, said second sub-decoder comprising a plurality of switches, each of which includes a second transistor of said first conductivity type having a back gate supplied with a second power supply voltage, which is different from said first power supply voltage; and a third sub-decoder receiving at least a reference voltage selected by said second sub-decoder and selecting and outputting a reference voltage to said first sub-decoder or to said output terminal of said decoder, said third sub-decoder comprising at least one switch including a third transistor of said first conductivity type having a back gate supplied with said first power supply voltage; said first power supply voltage being a first reference voltage, which is a voltage most spaced from said second voltage section among said first reference voltage group, or a predetermined voltage having a same magnitude relationship with said second voltage section as said first reference voltage and further spaced from said second voltage section than said first reference voltage, said second power supply voltage being a predetermined voltage within a range from a second reference voltage, which is a voltage closest to said first voltage section among said second reference voltage group, to a voltage within said first voltage section but not reaching said first reference voltage.