CHARGED-BASED COMPENSATION AND PARAMETER EXTRACTION IN AMOLED DISPLAYS

摘要

A system reads a desired circuit parameter from a pixel circuit that includes a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal. One embodiment of the extraction system turns off the drive device and supplies a predetermined voltage from an external source to the light emitting device, discharges the light emitting device until the light emitting device turns off, and then reads the voltage on the light emitting device while that device is turned off. The voltages on the light emitting devices in a plurality of pixel circuits may be read via the same external line, at different times. In-pixel, charge-based compensation schemes are also discussed, which can be used with the external parameter extraction implementations.

主权项

1. A method of extracting a circuit parameter from a pixel circuit and providing in-pixel compensation for variation or aging of the pixel circuit, the pixel circuit including a light emitting device, a drive device to provide a programmable drive current to the light emitting device, a programming input, and a storage device to store a programming signal, the method comprising:
causing an in-pixel compensation to self-compensate for a variation or aging of the drive device or the light emitting device or both in the pixel circuit; extracting, using a circuit external to the pixel circuit, the circuit parameter from the pixel circuit; and subsequently driving the pixel circuit using programming information that has been compensated based on at least the extracted circuit parameter.