Driving circuit for gamma voltage generator and gamma voltage generator using the same

A gamma voltage generator for a source driver, comprising:

• a resistor string, comprising a plurality of tap nodes;
• a plurality of first buffers, respectively connected to a plurality of first tap nodes among the plurality of tap nodes;
• a plurality of first digital-to-analog converters (DACs), each coupled to one of the plurality of first buffers;
• and
• a driving circuit, connected to a second tap node other than the plurality of first tap nodes among the plurality of tap nodes, the driving circuit comprising:
• a second buffer, connected to the second tap node;
• a second DAC, coupled to the second buffer;
• and
• a control circuit, coupled to the second DAC, configured to receive a plurality of first control signals for the plurality of first buffers and calculate a second control signal to be sent to the second DAC according to the plurality of first control signals;
• wherein the second tap node is located between two of the plurality of first tap nodes, and resistance values of resistors between the second tap node and the two first tap nodes are substantially equal;
• and
• wherein the second tap node is driven by the second buffer with an average voltage of two voltages of the two first tap nodes.