Backlight control method and related display driver circuit for variable refresh rate display panel

A display driver circuit for performing backlight control for a display panel, the display panel being configured to display with a variable refresh rate in a plurality of frame periods, each having a fixed period and a variable period, the display driver circuit comprising:

• a first signal generator, configured to generate a first backlight control signal in the fixed period of a first frame period among the plurality of frame periods;
• a main control circuit, configured to determine whether a liquid crystal molecule transition time corresponding to the first frame period ends before an end time of the variable period of the first frame period;
• and
• a second signal generator, configured to generate a second backlight control signal in a time period not overlapping the liquid crystal molecule transition time within the variable period of the first frame period when the liquid crystal molecule transition time ends before the end time of the variable period of the first frame period, and generate a compensation backlight control signal to compensate for a backlight of the first frame period in a second frame period next to the first frame period according to a backlight duty cycle of the first frame period.

A display driver circuit for performing backlight control for a display panel, the display panel being configured to display with a variable refresh rate in a plurality of frame periods, each having a fixed period and a variable period, the display driver circuit comprising:

• a signal generator, configured to generate a first backlight control signal in the fixed period of a first frame period among the plurality of frame periods;
• and
• a main control circuit, configured to determine whether a liquid crystal molecule transition time corresponding to the first frame period ends before an end time of the variable period of the first frame period;
• wherein the signal generator is further configured to generate a second backlight control signal in a time period not overlapping the liquid crystal molecule transition time within the variable period of the first frame period when the liquid crystal transition time ends before the end time of the variable period of the first frame period, and generate a compensation backlight control signal to compensate for a backlight of the first frame period in a second frame period next to the first frame period according to a backlight duty cycle of the first frame period.