Display driver and driving method thereof

The invention provides a display driver and a driving method thereof. The display driver comprises at least one first latch, at least one second latch, an output buffer and a comparator. The first latch receives input data. The input end of the second latch is coupled with the output end of the first latch. The output buffer includes at least one variable current source, the output buffer coupled to the second latch. The comparator is coupled with the first latch, the second latch and the variable current source. The comparator generates at least one control signal of the variable current source. 一种显示驱动器及其驱动方法。显示驱动器包括至少一个第一锁存器、至少一个第二锁存器、一输出缓冲器与一比较器。第一锁存器接收输入数据。第二锁存器的输入端耦合第一锁存器的输出端。输出缓冲器包括至少一个可变电流源，输出缓冲器耦合第二锁存器。比较器耦合第一锁存器、第二锁存器与可变电流源。比较器产生可变电流源的至少一个控制信号。