Led display control method and control card, led display screen system

A LED display screen system comprising a LED display control card and a LED display board electrically connected with the LED display control card, the LED display board being disposed with a decoder and a plurality of LEDs electrically connected to N numbers of scan lines, where N being a positive integer greater than 1;

• wherein:
• the LED display control card is disposed with a forward and reverse alternate scanning driving module, and the forward and reverse alternate scanning driving module is configured for:
• during a first round of scanning, generating a row selection signal to the decoder and thereby the decoder decoding the row selection signal to sequentially scan the N numbers of scan lines as per a first scanning order so as to drive and control the plurality of LEDs;
• and
• during a second round of scanning, generating another row selection signal to the decoder and thereby the decoder decoding the another row selection signal to sequentially scan the N numbers of scan lines as per a second scanning order so as to drive and control the plurality of LEDs;
• the first round of scanning and the second round of scanning being alternately performed, the first scanning order and the second scanning order being mutually reverse orders.

A LED display control card adapted for receiving an image signal and processing the received image signal to drive and control a LED display board, the LED display board being disposed with a plurality of LEDs electrically connected to N numbers of scan lines, where N is a positive integer greater than 1;

• wherein the LED display control card further is disposed with a forward and reverse alternate scanning driving module, and the forward and reverse alternate scanning driving module is configured for:
• during a first round of scanning, generating a row selection signal to the LED display board to thereby control the LED display board to sequentially scan the N numbers of scan lines as per a first scanning order so as to drive and control the plurality of LEDs;
• and
• during a second round of scanning, generating another row selection signal to the LED display board to thereby control the LED display board to sequentially scan the N numbers of scan lines as per a second scanning order so as to drive and control the plurality of LEDs;
• the first round of scanning and the second round of scanning being alternately performed, the first scanning order and the second scanning order being mutually reverse orders.