Method for driving mini-LED backlight module

A method for driving a mini light emitting diode (mini-LED) backlight module, comprising steps of:

• Step S100:
• dividing the mini-LED backlight module into M partitions along a first direction, wherein the mini-LED backlight module comprises a control unit and a data line connected to the control unit, the first direction is a direction extending from an end of the data line close to the control unit to an end of the data line away from the control unit, and the M partitions comprise a first partition, a second partition, . . . , a (M−1)-th partition and a M-th partition that are arranged sequentially along the first direction;
• Step S200:
• dividing a period of each frame used in the mini-LED backlight module into an adjusting sub-field and N displaying sub-fields for driving the mini-LED backlight module to emit light, wherein in a time duration of the adjusting sub-field, the data line outputs a low voltage level to a part of the mini-LED backlight module located in the first partition and the data line outputs a high voltage level to a part of the mini-LED backlight module located in the M-th partition;
• and adjusting the time duration of the adjusting sub-field based on brightness values of the first partition and the M-th partition, to obtain a duration Tadjust of the adjusting sub-field that makes a brightness difference between the first partition and the M-th partition fall within a first brightness threshold range;
• wherein the adjusting the time duration of the adjusting sub-field based on brightness values of the first partition and the M-th partition, to obtain a duration Tadjust of the adjusting sub-field that makes a brightness difference between the first partition and the M-th partition fall within a first brightness threshold range, comprises:
• increasing the time duration of the adjusting sub-field when the brightness difference between the first partition and the M-th partition exceeds the first brightness threshold range and the brightness value of the first partition is greater than the brightness value of the M-th partition;
• or decreasing the time duration of the adjusting sub-field when the brightness difference between the first partition and the M-th partition exceeds the first brightness threshold range and the brightness value of the first partition is less than the brightness value of the M-th partition;
• driving the mini-LED backlight module to emit light, wherein in the increased or decreased time duration of the adjusting sub-field, the data line outputs the low voltage level to a part of the mini-LED backlight module located in the first partition and the data line outputs the high voltage level to a part of the mini-LED backlight module located in the M-th partition;
• or
• obtaining the duration Tadjust of the adjusting sub-field once the driving of the mini-LED backlight module makes the brightness difference between the first partition and the M-th partition fall within the first brightness threshold range;
• Step S300:
• dividing the adjusting sub-field corresponding to each partition into a bright sub-field and a dark sub-field, wherein in a duration of the bright sub-field corresponding to any of the partitions, the data line outputs the high voltage level to a part of the mini-LED backlight module located in the any of partitions in a duration of the dark sub-field corresponding to any of the partitions, the data line outputs the low voltage level to a part of the mini-LED backlight module located in the any of partitions;
• and driving the mini-LED backlight module to emit light in different gray modes, and in each of the gray modes, adjusting a time duration of the bright sub-field or the dark sub-field corresponding to each partition based on the brightness value of each partition, to obtain under the gray mode a duration of the bright sub-field and a duration of the dark sub-field that make the brightness difference between each partition and the first partition fall within a second brightness threshold range;
• wherein in the dividing the adjusting sub-field corresponding to each partition into the bright sub-field and the dark sub-field, a duration of the bright sub-field corresponding to the first partition is zero, and a duration of the bright sub-field corresponding to the M-th partition is equal to the duration of the adjusting sub-field;
• and
• Step S400:
• driving the mini-LED backlight module to emit light based on a duration of the bright sub-field and a duration of the dark sub-field corresponding to each partition under different gray modes.