Patent ID: 9093029
Filing Date: 2015-07-28
Classification: G01R,G09G,H03F

Abstract:
1. A method of extracting a circuit output parameter from a 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: charging a capacitance of the pixel circuit to a charge level related to the circuit output parameter to be extracted from the pixel circuit; reading out the said charge or a voltage associated with said charge by an external readout circuit; determining the value of at least one pixel circuit output parameter from said readout, said output parameter being related to the aging of the pixel circuit or the non-uniformity of multiple pixel circuits; and using the determined value of the at least one pixel circuit output parameter to do at least one of (a) modify programming data for said pixel circuit according to the determined value to compensate for pixel variations, (b) pre-age a display panel containing said pixel circuit, and (c) evaluate a process yield.