Digital-to-analog converters including full-type and fractional decoders, and source drivers for display panels including the same

A digital-to-analog converter, comprising:

• a first lower bit decoder configured to select one of a plurality of first gamma reference voltages based on lower D bits of an N-bit digital data word, the plurality of first gamma reference voltages corresponding to a first nonlinear interval among a plurality of gamma reference voltages;
• a second lower bit decoder configured to select one of a plurality of second gamma reference voltages based on the lower D bits of the N-bit digital data word, the plurality of second gamma reference voltages corresponding to a second nonlinear interval among the plurality of gamma reference voltages;
• a quarter-type decoder configured to receive a plurality of third gamma reference voltages, and configured to select four of the plurality of third gamma reference voltages based on the N-bit digital data word, the plurality of third gamma reference voltages corresponding to a linear interval among the plurality of gamma reference voltages and respectively having a four gray scale level difference between adjacent ones of the plurality of third gamma reference voltages;
• a first lower bit decoder output switching circuit configured to switch four fourth gamma reference voltages based on upper (N-D) bits of the N-bit digital data word, the selected first gamma reference voltage being divided into the four fourth gamma reference voltages by the first lower bit decoder output switching circuit;
• a second lower bit decoder output switching circuit configured to switch four fifth gamma reference voltages based on upper (N-D) bits of the N-bit digital data word, the selected second gamma reference voltage being divided into the four fifth gamma reference voltages by the second lower bit decoder output switching circuit;
• and
• an averaging amplifier configured to output an average gamma reference voltage of the four third gamma reference voltages, or an average gamma reference voltage of the four fourth gamma reference voltages, or an average gamma reference voltage of the four fifth gamma reference voltages.