Source driver having an output buffer circuit with slew rate compensation and display device thereof

A source driver of a display device, comprising:

• a shift register configured to generate a plurality of latch clock signals based on a clock signal and on an input-output control signal;
• a data latch configured to store data in response to the plurality of latch clock signals and to output a plurality of digital input signals corresponding to the data in response to a load signal;
• a digital-to-analog converter configured to generate a plurality of input voltage signals corresponding to the plurality of digital inputs signals, the generating the plurality of input voltage signals using gray voltages;
• and
• a plurality of output buffer circuits configured to buffer the plurality of input voltage signals to drive source lines of a display panel, each of the buffer circuits comprising,
• an operational amplifier configured to generate an amplifier output voltage signal based on each of the input voltage signals and on a compensation current,
• a slew rate compensating circuit configured to generate the compensation current to increase a slew rate of the amplifier output voltage signal based on a difference between each of the input voltage signals and a feedback voltage signal,
• an output path circuit connected between the operational amplifier and an output pad, the output path circuit configured to transfer the amplifier output voltage signal to generate a pad output voltage signal through the output pad, and
• a feedback path circuit connected between the slew rate compensating circuit and a feedback input node that is on the output path circuit, the feedback path circuit configured to generate the feedback voltage signal.