A liquid crystal display comprises a TFT-LCD module (110) and corresponding phase delay plates (120). Pixels on the TFT-LCD module (110) comprise pixels of a left eye signal (111), pixels of a black matrix signal (112), pixels of a right eye signal (113) and a first display mode in which the pixels of the black matrix signal (112) are arranged circularly in sequence in the form of a cross bar. The pixels of the left eye signal (111) and the corresponding pixels of the black matrix signal (112) send polarization signals by using the phase delay plate (120) of one type, and the pixels of the right eye signal (113) and the corresponding pixels of the black matrix signal (112) send polarization signals by using the phase delay plate (120) of another type. The liquid crystal display modifies the pixel signals sent by the TFT-LCD module (110) to reduce the crosstalk when 3D images are watched and eliminate brightness decay when 2D images are watched.