Abstract text

An AMOLED pixel unit includes an OLED, first to fourth switches, and an energy-storage element. The OLED has a cathode receiving a ground voltage. The first switch has a first terminal receiving a data signal. The second switch has a first terminal coupled to a second terminal of the first switch. Control terminals of the first and second switches receive a scan signal. The third switch has a first terminal coupled to the second terminal of the first switch, a second terminal receiving an operation voltage, and a third control terminal coupled to a second terminal of the second switch. The fourth switch has a first terminal coupled to an anode of the OLED, a second terminal receiving the operation voltage, and a fourth control terminal coupled to the third control terminal. The energy-storage element coupled to the fourth control terminal receives the operation or ground voltage.