A system for displaying image is provided. The system includes a pixel unit coupled to a source driver and including a first switch, a second switch, a first capacitor, a second capacitor, a driving transistor, and a luminiferous device. The first switch includes a first control terminal receiving a first scan signal, a first terminal receiving a first operation voltage, and a second terminal. The second switch includes a second control terminal receiving a second scan signal, a third terminal, and a fourth terminal coupled to the source driver. The first capacitor is coupled between the first and the second terminals. The second capacitor is coupled between the second and the third terminals. The driving transistor includes a gate coupled to the second terminal, a source receiving the first operation voltage, and a drain. The luminiferous device is coupled to the drain and receiving a second operation voltage.