Backlight device, operation method and display device for reducing motion blur

A operation method of a backlight device, comprising:

• lighting, by a local dimming circuit of the backlight device, each of N light zones of a backlight module of the backlight device in a time-sharing manner in each of a plurality of scan periods of the backlight module to provide a backlight to a display panel, wherein N is a positive integer;
• adjusting, by the local dimming circuit, time lengths of the scan periods of the backlight module so that the time length of each of the scan periods of the backlight module is greater than or equal to a time length of a video active data period of the display panel, wherein a frequency of occurrence of the scan periods of the backlight module is different from a frequency of occurrence of a plurality of display frames of the display panel;
• and
• adjusting, by the local dimming circuit, a continuous lighting time length of each of the N light zones, so that the continuous lighting time length of each of the N light zones is less than or equal to a quotient of the time length of the video active data period divided by N.

A display device, comprising:

• a display panel;
• a scaler integrated circuit (IC) coupled to the display panel;
• and
• a backlight device coupled to the scaler IC, wherein the backlight device comprises N light zones for providing a backlight to the display panel, N is a positive integer, the backlight device lights each of the N light zones in a time-sharing manner in each of a plurality of scan periods of the backlight module, a time length of each of the scan periods of the backlight module is greater than or equal to a time length of a video active data period of the display panel, a continuous lighting time length of each of the N light zones is less than or equal to a quotient of the time length of the video active data period divided by N, and a frequency of occurrence of the scan periods of the backlight module is different from a frequency of occurrence of a plurality of display frames of the display panel.