A display brightness adjustment method includes: an electronic apparatus obtains a to-be-displayed image and determines an average pixel brightness value of each backlight partition on a liquid crystal display (LCD) panel based on the to-be-displayed image, where a backlight region of the LCD panel is divided into a plurality of backlight partitions; the electronic apparatus determines an initial dimming duty cycle corresponding to each backlight partition based on the average pixel brightness value of each backlight partition; the electronic apparatus determines a drive current value based on the initial dimming duty cycle corresponding to each backlight partition and drive current threshold data; the electronic apparatus adjusts, based on the drive current value, light emitting brightness of the backlight region that exists when the to-be-displayed image is displayed.