The invention discloses a
thin film transistor (TFT) array substrate, a
liquid crystal display, a driving method thereof and a three-dimensional (3D) display
system. An effective display pixel
electrode and an active light blocking
electrode are respectively arranged at an upper area and a lower area in each sub-pixel unit, and different grid
electrode signal lines and
data lines are used respectively for providing electric signals for the effective display pixel electrodes and the active light blocking electrodes. In a two-dimensional (2D) display mode, the areas where the active light blocking electrodes are located display images normally, and normal display cannot be influenced; in 3D display mode, the areas where the active light blocking electrodes are located form dark fields, and
crosstalk light between adjacent pixels in the vertical direction can be reduced so as to improve a vertical
visual angle of 3D display. In the 3D display mode, public electrode signals are exerted on the active light blocking electrodes, no
voltage difference between the active light blocking electrodes and public electrodes is guaranteed when a TFT switch connected with the active light blocking electrodes leaks
electricity, the phenomenon that brightening occur at the areas where the active light blocking electrodes are located is prevented, and the problem of
crosstalk is avoided.