Patent ID: 9171500
Filing Date: 2015-10-27
Classification: G09G

Abstract:
1. A method of extracting a parasitic capacitance value 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: measuring at least one parameter of the pixel circuit when in a first state having a first set of operating voltages and currents, measuring at least one parameter of the pixel circuit when in a second state having a second set of operating voltages and currents different from said first set, modeling the effect of parasitic capacitance on measured parameters at different sets of operating conditions, said modeling being done before or after said measuring of said parameters of the pixel circuit when in said first and second states, and extracting the value of a selected parasitic capacitance from said measurements and said modeling.