Patent ID: 8384632
Filing Date: 2013-02-26
Classification: G09G

Abstract:
1. A pixel circuit, comprising: a light emitting diode with a first end coupled to a first power source terminal; a driving transistor with a source and a drain respectively coupled to a second power source terminal and a second end of the light emitting diode; a capacitor coupling a gate of the driving transistor to a reference voltage terminal; and a first switch, when a first scan signal is asserted, coupling the second end of the light emitting diode to the capacitor, and coupling the gate and the drain of the driving transistor together, wherein the reference voltage terminal provides a first reference voltage when the pixel circuit is in a precharge stage, wherein the reference voltage terminal provides a second reference voltage when the pixel circuit is in a programming stage, wherein the second reference voltage is not lower than the first reference voltage when the driving transistor is an NMOS transistor.