Source driver and display driving circuit including the same

A source driver comprising:

• a first buffer which is connected to a first source line, and includes
• a first interpolation circuit which receives first pixel data, a first gamma voltage, and a second gamma voltage smaller than the first gamma voltage, interpolates between the first and second gamma voltages to select a first target voltage corresponding to the first pixel data, and steps down a first source voltage of the first source line to a first target voltage, and
• a first fast-slew circuit which receives a third gamma voltage smaller than the second gamma voltage, and compares the first source voltage with the third gamma voltage to adjust slew rate of the first source voltage;
• a second buffer which is connected to the second source line, and includes
• a second interpolation circuit which receives second pixel data, a fourth gamma voltage, and a fifth gamma voltage smaller than the fourth gamma voltage, interpolates between the fourth and fifth gamma voltages to select a second target voltage corresponding to the second pixel data, and steps up the second source voltage of the second source line to a second target voltage, and
• a second fast-slew circuit which receives a sixth gamma voltage greater than the fourth gamma voltage, and compares the second source voltage with the sixth gamma voltage to adjust slew rate of the second source voltage;
• and
• a decoder circuit which receives a plurality of gamma voltages, selects the first through sixth gamma voltages among the plurality of gamma voltages, and provides them to the first and second buffers.

A display driving circuit comprising:

• a source driver which applies a first target voltage to a first source line connected to a first pixel on the basis of pixel data;
• a gamma voltage generator which provides a plurality of gamma voltages to the source driver;
• and
• a timing controller which controls the source driver and the gamma voltage generator, and provides the pixel data to the source driver,
• wherein the source driver includes:
• a decoder circuit that selects a first gamma voltage and a second gamma voltage among the plurality of gamma voltages based on the pixel data, and selects a third gamma voltage different from the first and second gamma voltages among the plurality of gamma voltages, and
• a first buffer that interpolates between the first and second gamma voltages to output the first target voltage, steps up or steps down a first source voltage formed on the first source line to the first target voltage, and compares the first source voltage with the third gamma voltage to adjust slew rate of the first source voltage.