Voltage programmed pixel circuit, display system and driving method thereof

摘要

A voltage programmed pixel circuit, display system having the pixel circuit and driving method thereof is provided. The pixel circuit includes a light emitting device, a driving transistor connected to the light emitting device and a programming circuit. The programming circuit adjusts a pixel current during a programming cycle of the pixel circuit.

主权项

1. A method of programming a pixel circuit including a driving section having a drive transistor and an emissive device and a programming section having a programming transistor, the method comprising:
the programming transistor converting its gate-source voltage to a programming current, the programming transistor operating as a stable local reference transistor to supply the programming current as a local current source to the drive transistor; the programming current adjusting a gate-source voltage of the drive transistor; and the driving section driving the emissive device with a drive current related to the programming current and causing the emissive device to emit light according to at least the programming current while the programming transistor remains off, such that the drive current is independent of aging effects of the drive transistor and of the emissive device, wherein the programming transistor is on for a small fraction of time during a frame and is off during the rest of the frame including the entire time the driving section is driving the emissive device, and wherein the emissive device is off during a programming cycle of the pixel circuit.