Display synchronization system and method and display device

The invention discloses a display synchronization system and method and a display device, and the system comprises a processor and a plurality of display drive circuits. Each display driving circuit is connected with the processor through a first transmission channel and a second transmission channel; the processor is used for sending first frame display data and a first time sequence synchronization instruction to the corresponding display driving circuit through each first transmission channel; the processor is further used for receiving a feedback signal output by the display driving circuit in response to the first time sequence synchronization instruction through the second transmission channel, and obtaining a time interval from the time when the processor sends the first frame display data to the time when the display driving circuit outputs the first frame display data according to the feedback signal; and the processor is also used for adjusting the time for sending the second frame display data to e