Source driving circuit for improving gamma voltage response time and display device

A display device comprises a plurality of scan lines and a plurality of data lines which are intersected and insulated with each other;

• the display device further comprises:
• a gamma correction reference voltage circuit, configured to output gamma correction reference voltage based on a gamma correction curve;
• and
• a source driving circuit configured to convert digital signal into driving voltages;
• the source driving circuit comprises:
• gamma resistor strings configured to receive the gamma correction reference voltages and generate gamma voltages;
• a digital to analog (DAC) circuit electrically connected to the gamma resistor strings, and configured to select corresponding gamma voltages from the gamma resistor strings based on digital signals;
• and
• an output buffer circuit configured to receive the gamma voltages and output driving voltages, wherein the output buffer circuit comprises an input stage module, a gain stage module, and an output stage module;
• the input stage module comprises a main input stage unit and an auxiliary input stage unit;
• sizes of elements in the auxiliary input stage unit are smaller than sizes of elements in the main input stage unit;
• the input stage module operates in a switching period and a stable period, alternately;
• during the switching period, the auxiliary input stage unit, the gain stage module, and the output stage module form a first unity gain amplifier for outputting the driving voltages based on the gamma voltages;
• during the stable period, the main input stage unit, the gain stage module, and the output stage module form a second unity gain amplifier for outputting the driving voltages based on the gamma voltages.

A source driving circuit, the source driving circuit receives gamma correction reference voltages from a gamma correction reference voltage circuit, and is electrically connected to data lines;

• the source driving circuit comprises:
• gamma resistor strings configured to receive the gamma correction reference voltages and generate gamma voltages;
• a digital to analog (DAC) circuit electrically connected to the gamma resistor strings, and configured to select corresponding gamma voltages from the gamma resistor strings based on digital signals;
• and
• an output buffer circuit configured to receive the gamma voltages and output driving voltages for the data lines, wherein the output buffer circuit comprises an input stage module, a gain stage module, and an output stage module;
• the input stage module comprises a main input stage unit and an auxiliary input stage unit;
• sizes of elements in the auxiliary input stage unit are smaller than sizes of elements in the main input stage unit;
• the input stage module operates in a switching period and a stable period, alternately;
• during the switching period, the auxiliary input stage unit, the gain stage module, and the output stage module form a first unity gain amplifier for outputting the driving voltages based on the gamma voltages;
• during the stable period, the main input stage unit, the auxiliary input stage unit, the gain stage module, and the output stage module form a second unity gain amplifier for outputting the driving voltages based on the gamma voltages;
• output terminals of the auxiliary input stage unit are directly connected with the gain stage module.