Gray scale voltage decoder and digital-to-analog converter including the same

A digital-to-analog converter of a display device, comprising:

• a gray scale voltage generator configured to generate gray scale voltages by sequentially dividing a reference voltage using a plurality of resistors;
• a first decoding unit including row blocks configured to select part of the gray scale voltages to output the selected gray scale voltages, each of the row blocks configured to receive one of the gray scale voltages and determine whether to output the received gray scale voltage in response to first bits of digital image data, the digital image data being provided through data input lines formed along a column direction;
• and
• a second decoding unit configured to select one of the gray scale voltages selected by the first decoding unit in response to second bits of the digital image data and to output the selected the gray scale voltage, the second bits separate from the first bits,
• wherein each of the row blocks comprises a switch corresponding to each of the first bits for outputting the received gray scale voltage, the switch being responsive to the first bits applied to each respective switch in each row block,
• wherein the first decoding unit includes row block groups, each of the row block groups including some of the row blocks that are arranged adjacently, each of the row blocks included in a same row block group outputting the received gray scale voltage in response to the same values of the first bits, the switches included in the row blocks in the same row block group being implemented with a same arrangement.