Patent ID: 9269322
Filing Date: 2016-02-23
CPC Classification: G09G

Claim Text:
1. A display system, the system comprising: a pixel circuit for being programmed according to programming information during a programming cycle, and driven to emit light according to the programming information during an emission cycle, the pixel circuit comprising: a light emitting device for emitting light during the emission cycle, a drive transistor for conveying a drive current through the light emitting device during the emission cycle, said drive transistor having gate, source and drain terminals, a storage capacitor for being charged with a voltage based at least in part on the programming information during the programming cycle, said storage capacitor having first and second terminals, said first terminal being coupled to the gate of said drive transistor, a first switch transistor, operated according to a first select line, for conveying the voltage to the storage capacitor during the programming cycle, and a regulating transistor for conveying a leakage current to a gate terminal of the drive transistor, thereby adjusting a gate voltage of the drive transistor, said regulating transistor having gate, source and drain terminals, said gate terminal of the regulating transistor being coupled to one of said terminals of said storage capacitor, one of the source and drain terminals of said regulating transistor being coupled to said gate terminal of said drive transistor, and the other of said source and drain terminals of said regulating transistor being direct connected to a node between said light emitting device and said drive transistor, wherein the pixel circuit provides constant averaged current over a frame time.