A pixel structure is disposed on a substrate and electrically connected to a scan line and a data line. The pixel structure including an active device, a bottom capacitor electrode, an insulator, and a pixel electrode is provided. The active device is disposed on the substrate and has a gate, a source and a drain. Besides, the active device is electrically connected to the scan line and the data line. The bottom capacitor electrode and the gate are separately disposed on the substrate. The insulator covering the active device and the bottom capacitor electrode is made of a mono film. The pixel electrode is electrically connected to the active device, and at least a part of the pixel electrode extends to the insulator above the bottom capacitor electrode.