Backlight module, driving method and display device thereof

A driving method of a backlight module, wherein the backlight module comprises at least one light-emitting group, wherein the light-emitting group comprises a main drive unit provided with a plurality of main signal transmission channels and an auxiliary drive unit provided with a plurality of auxiliary signal transmission channels, and the auxiliary signal transmission channels and the main signal transmission channels are arranged in parallel in one-to-one correspondence and connected to a same group of light-emitting units;

• the driving method of the backlight module comprises:
• obtaining a comparison result by comparing values of a refresh frequency at which the backlight module is lit and a rated refresh frequency of the main drive unit, and obtaining a comparison result by comparing number of bits of a gray-scale data when the backlight module is lit with number of bits of a gray-scale value corresponding to a current change bit of the main signal transmission channel;
• and
• controlling operating states of the main signal transmission channel and the auxiliary signal transmission channel according to the comparison result between the refresh frequency and the rated refresh frequency of the main drive unit and the comparison result between the gray-scale data and the gray-scale value corresponding to the current change bit of the main signal transmission channel.

A display device comprising:

• a display screen;
• a backlight module, disposed at one side of the display screen, comprising:
• at least one light-emitting group, each of which comprises a main drive unit provided with a plurality of main signal transmission channels and a plurality of groups of light-emitting units, each of the main signal transmission channels being connected to a group of the light-emitting units,
• an auxiliary drive unit, wherein the auxiliary drive unit and the main drive unit are connected in parallel, the auxiliary drive unit is provided with a plurality of auxiliary signal transmission channels, the auxiliary signal transmission channels and the main signal transmission channels are arranged in parallel in one-to-one correspondence and are connected to the group of light-emitting units;
• and
• a controller connected to the main drive unit and the auxiliary drive unit, respectively, and configured to control operating states of the main signal transmission channel and the auxiliary signal transmission channel according to a refresh frequency and gray-scale data;
• and
• a power module connected to the controller and the display screen, respectively and configured to provide power for the display screen and the backlight module.