Patent ID: 6650060
Filing Date: 2003-11-18
Classification: G09G

Abstract:
A pixel driving apparatus for a light emitting display comprising:a light emitting element; a driving transistor having a drain, a source, and a gate; a current programming means for injecting a model current into one of the drain and the source of the driving transistor to program a gate voltage generated in response to the injection of the model current therein; and a light emitting element driving means for connecting the one of the drain and the source of the driving transistor to a side of the light emitting element to be driven after programming of the model current by the current programming means has been completed to drive the light emitting element; wherein the current programming means comprises: a model current source for injecting the model current into the one of the drain and the source of the driving transistor; a first switching means connected between the light emitting element and the one of the drain and the source of the driving transistor; a first means for injecting the model current from the model current source into the one of the drain and source of the driving transistor through the first switching means in a state where the light emitting element is separated from the circuit; and a voltage accumulating means for accumulating the gate voltage; and wherein the light emitting element driving means comprises: a second and a third switching means which are connected between the model current source and the one of the drain and the source of the driving transistor and connected between the model current source and a gate of the driving transistor, respectively; a current supplying means for separating the model current source from the one of the drain and the source of the driving transistor through the second switching means to supply a current to the emitting clement by the gate voltage accumulated in the voltage accumulating means; and a second means for holding supply of the gate voltage by the voltage accumulating means through the third switching means until an operation of the current programming means becomes valid.