Brightness adjustment method, device and display apparatus

A brightness adjustment method, comprising:

• acquiring a brightness adjustment instruction and a target display brightness value of a display panel, the display brightness value being used to represent backlight brightness of the display panel;
• adjusting a duty cycle of a light-emitting control signal based on the target display brightness value of the display panel;
• driving LEDs of a corresponding row in a backlight source to emit light by use of the adjusted light-emitting control signal, wherein for each row of LEDs in the backlight source of the display panel, the light-emitting control signal corresponding to that row of LEDs comprises N pulse cycles;
• and
• each time the duty cycle of the light-emitting control signal needs to be adjusted, performing corresponding adjustment on a duty cycle of each pulse cycle of a selected part of the N pulse cycles of the light-emitting control signal, within a corresponding to-be-adjusted frame period,
• wherein,
• N is a positive integer greater than 2;
• and
• during the corresponding to-be-adjusted frame period together with an adjacent frame period before the corresponding to-be-adjusted frame period, a duty cycle of the at least one of the N pulse cycles of the light-emitting control signal is prevented from being adjusted.