Source driver using an interpolation method and display driver including the same

A display driver comprising:

• a buffer unit including a plurality of unit buffers, wherein each of the plurality of unit buffers includes an output terminal and a plurality of input terminals;
• a plurality of gamma lines configured to provide a plurality of gamma voltages;
• and
• a decoder unit connecting two or more gamma lines among the plurality of gamma lines to the plurality of input terminals included in each of first unit buffers among the plurality of unit buffers, wherein the first unit buffers output a gradation voltage within a predetermined range,
• wherein during a predetermined period, the plurality of input terminals included in one of the first unit buffers are connected to first gamma lines among the plurality of gamma lines, and the plurality of input terminals included in another of the first unit buffers are connected to second gamma lines among the plurality of gamma lines.

A source driver comprising:

• a buffer unit including a plurality of unit buffers, wherein each of the plurality of unit buffers includes a plurality of first input terminals configured to receive first input voltages, a second input terminal configured to receive an output voltage through a feedback path, and an output terminal configured to output the output voltage, and the output voltage has an average value of the first input voltages;
• and
• a decoder unit configured to control the output voltage of each of the plurality of unit buffers, using image data, and when the image data is within a predetermined range, to select a gamma voltage having a magnitude different from a magnitude of the output voltage, as at least one of the first input voltages,
• wherein the decoder unit selects, a gamma voltage having the same magnitude as a magnitude of the output voltage, as the first input voltages, when the output voltage is not within the predetermined range.