Patent ID: 9202407
Filing Date: 2015-12-01
Classification: G09G

Abstract:
1. A pixel circuit, comprising: a switch unit, receiving a data voltage, a scan signal and a ground voltage, and providing the data voltage or the ground voltage according to the scan signal; a capacitor, a first terminal of the capacitor being coupled to the switch unit to receive the data voltage or the ground voltage; a first transistor, a first terminal of the first transistor being coupled to a high voltage, a second terminal of the first transistor being coupled to a second terminal of the capacitor, and a control terminal of the first transistor receiving a first switch signal; a second transistor, a first terminal of the second transistor being coupled to the high voltage, and a control terminal of the second transistor being coupled to the second terminal of the capacitor; a third transistor, a first terminal of the third transistor being coupled to a second terminal of the second transistor, a second terminal of the third transistor being coupled to the second terminal of the capacitor, and a control terminal of the third transistor receiving a second switch signal; and an organic light emitting diode, an anode of the organic light emitting diode being coupled to the second terminal of the second transistor, and a cathode of the organic light emitting diode being coupled to a system low voltage; wherein in a pre-charging period, the first terminal of the capacitor receives the data voltage through the switch unit and the second terminal of the capacitor receives the high voltage through the turned-on first transistor, in a programming period, the first terminal of the capacitor receives the data voltage through the switch unit and the second terminal of the capacitor receives the high voltage that is encoded level through the turned-on second and third transistors, and in a display period, the first terminal of the capacitor receives the ground voltage through the switch unit and the first and third transistors are turned-off, wherein in the pre-charging period, the first switch signal is enabled turns-on the first transistor and the second switch signal that is disabled turns-off the third transistor, in the programming period, the first switch signal that is disabled turns-off the first transistor and the second switch signal that is enabled turns-on the third transistor, and in the display period, the first switch signal that is disabled turns-off the first transistor and the second switch signal that is disabled turns-off the third transistor.