Data compensation method and data compensation device for liquid crystal display screen

The embodiment of the invention discloses a data compensation method and a data compensation device for a liquid crystal display screen. The method comprises the following steps of during a start-on process, determining timing duration delta T' from the last shutdown moment, and determining a frame display unevenness mura data compensation table am called at the last shutdown moment; determining a mura data compensation table called at this-time start-on moment according to a preset time T needed for mura stabilization, a preset mura data compensation table corresponding to different time intervals as well as the determined delta T' and the determined mura data compensation table am; and starting performing data compensation from the determined mura data compensation table called at this-time start-on moment. Since different mura data compensation tables are configured for different time intervals, after the data compensation device is started on, a suitable initiative data compensation table is determined in