A pixel structure of a thin film transistor liquid crystal display employs a design of three metal layers and includes an organic insulating layer between a data signal line and a common electrode for reducing a parasitic capacitance, while a passivation layer included between the common electrode and a pixel electrode acts as a storage capacitor required for the pixels, so as to achieve a high aperture ratio, and the common electrode can act as a shielding bar for enhancing the display contrast.