Method, system, device, apparatus and medium for driving LED display screen

A system for driving an LED display screen, comprising:

• a memory, configured to store a grayscale non-dispersion threshold value, a total number of sub-frames of a target frame image and a total grayscale value of each LED lamp bead in the LED display screen in the target frame image;
• a sub-frame counter, configured to generate a sub-frame sequence number of each sub-frame image of the target frame image;
• a growth counter, configured to generate a grayscale growth sequence number representing a grayscale allocation priority corresponding to each sub-frame image of the target frame image according to the sub-frame sequence number of each sub-frame image of the target frame image;
• a comparator, configured to respectively comparing the total grayscale value of each LED lamp bead stored in the memory in the target frame image with a grayscale threshold value, and output a corresponding comparison result for each LED lamp bead;
• a selector, configured to select one of the grayscale non-dispersion threshold value and the total number of the sub-frames stored in the memory according to the corresponding comparison result for each LED lamp bead output by the comparator, and output a corresponding selection result for each LED lamp bead;
• a processor, configured to determine a sub-grayscale value of each LED lamp bead in each sub-frame image of the target frame image according to the corresponding selection result output by the selector, the grayscale growth sequence number of each sub-frame image of the target frame image generated by the growth counter and the total grayscale value of each LED lamp bead in the target frame image stored in the memory;
• and
• and an SPWM generator, configured to generate an SPWM pulse for each LED lamp bead in each sub-frame image of the target frame image according to the sub-grayscale value of each LED lamp bead in each sub-frame image of the target frame image, so as to drive the LED display screen to sequentially display each sub-frame image of the target frame image,
• wherein the processor is further configured to determine a product of the grayscale non-dispersion threshold value and the total number of the sub-frames as the grayscale threshold value, and output the grayscale threshold value to the comparator, wherein the total number of the sub-frames is a natural number selected from 1 to 512;
• the grayscale non-dispersion threshold value is a natural number greater than 1 when a non-dispersion mode at low grayscale is enabled, and the grayscale non-dispersion threshold value is equal to 1 when the non-dispersion mode at low grayscale is not enabled.

A device for driving an LED display screen, comprising:

• a processor unit, wherein, for each LED lamp bead in the LED display screen, if it is determined that a total grayscale value of that LED lamp bead in a target frame image is greater than a grayscale threshold value, the processor unit is configured to determine a sub-grayscale value of that LED lamp bead in each sub-frame image of the target frame image according to the total grayscale value of that LED light beads in the target frame image, a total number of sub-frames in the target frame image, and a grayscale growth sequence number of each sub-frame image of the target frame image;
• if it is determined that the total grayscale value of that LED lamp bead in the target frame image is not greater than the grayscale threshold value, the processor unit is configured to determine the sub-grayscale value of that LED lamp bead in each sub-frame image of the target frame image according to the total grayscale value of that LED lamp bead in the target frame image, a grayscale non-dispersion threshold value and the grayscale growth sequence number of each sub-frame image of the target frame image;
• wherein the grayscale growth sequence number of each sub-frame image is a parameter which is determined according to the sub-frame sequence number of that sub-frame image and represents a grayscale allocation priority of that sub-frame image;
• a driver unit, configured to drive the LED display screen to sequentially display each sub-frame image of the target frame image according to the sub-grayscale value of each LED lamp bead in the LED display screen in each sub-frame image of the target frame image,
• a setting unit, configured to determine a product of the grayscale non-dispersion threshold value and the total number of the sub-frames as the grayscale threshold value, wherein the total number of the sub-frames is a natural number selected from 1 to 512;
• the grayscale non-dispersion threshold value is a natural number greater than 1 when a non-dispersion mode at low grayscale is enabled, and the grayscale non-dispersion threshold value is equal to 1 when the non-dispersion mode at low grayscale is not enabled.