during a data generation stage;

when a temperature of a display panel is increased and sequentially reaches a plurality of preset temperatures, adjusting an initial gamma curve according to a plurality of drop ratios of the display panel at a plurality of gray levels, to generate a plurality of adjusted gamma curves at the preset temperatures; and

selecting a plurality of reference points from the adjusted gamma curves at the preset temperatures;

performing axis transformation on the reference points by replacing an axis of pixel coordinate with an axis of temperature to generate a plurality of transformed reference points; and

fitting the transformed reference points to generate a plurality of functions of gamma versus temperature, and generating a gamma correction table according to the functions of gamma versus temperature;

and during an operation stage;

receiving temperature data of the display panel;

obtaining the gamma correction table;

substituting the temperature data into the functions of gamma versus temperature in the gamma correction table to generate a plurality of gamma adjustment points;

generating a gamma correction curve according to the gamma adjustment points; and

displaying an image, by the display panel, according to the gamma correction curve.