Source driver and method for updating a gamma curve

A source driver, comprising:

• at least a first drive channel circuit, configured for receiving a first pixel data from a timing controller via a data bus, converting the first pixel data to a first drive voltage according to a first reference voltage group, and driving a first data line of a display panel using the first drive voltage;
• a voltage controller, configured for receiving a voltage command from the timing controller, generating and changing a first reference voltage configuration data according to the voltage command;
• and
• a first programmable voltage buffer unit, coupled to the voltage controller and the first drive channel circuit, configured for receiving the first reference voltage configuration data, generating and adjusting the first reference voltage group for applying to the first drive channel circuit according to the first reference voltage configuration data,
• wherein the timing controller transmits the voltage command to the source driver via the data bus during a line data transmitting period, a horizontal blanking period or a vertical blanking period.