Patent ID: 8614652
Filing Date: 2013-12-24
Classification: G09G,H05B

Abstract:
1. A pixel circuit configured to be operated in a programming cycle, during which the pixel circuit receives a programming voltage according to display data, and operated in a driving cycle different from the programming cycle, during which the pixel circuit emits light according to the programming voltage, the pixel circuit comprising: a light emitting device for being driven to emit light during the driving cycle; a driving transistor connected in series with the light emitting device, for driving the light emitting device to emit light during the driving cycle; a storage capacitor having a first terminal and a second terminal for storing a voltage related to the programming voltage during the programming cycle; a first switch transistor having a gate terminal, a first terminal and a second terminal, one of said first and second terminals of said first switch transistor being connected to said first terminal of said storage capacitor, the other of said first and second terminals of said first switch transistor being connected to a signal line, the first switch transistor being turned on during the programming cycle to convey the programming voltage, dependent on a programming data for said pixel circuit, from said signal line to said first terminal of said storage capacitor; a second switch transistor having a gate terminal, a first terminal and a second terminal, one of said first and second terminals of said second switch transistor being connected to said second terminal of said storage capacitor and a first terminal of said driving transistor, the other of said first and second terminals of said second switch transistor being connected to a bias line, the second switch transistor being turned on during said programming cycle to convey a controllable bias current, independent of said programming data for said pixel circuit, from said bias line through said driving transistor so as to compensate for a time-dependent parameter of the pixel circuit; and an emission control transistor for applying to the driving transistor, during the driving cycle, the voltage stored on the storage capacitor during the programming cycle, the emission control transistor being coupled between the first terminal of the storage capacitor and a gate terminal of the driving transistor.