Patent ID: 9171504
Filing Date: 2015-10-27
Classification: G09G

Abstract:
1. A method of compensating for deviations by a measured device current from a reference current in a display having a plurality of pixel circuits each including a storage device, a drive transistor, and a light emitting device, the method comprising: performing a first reset operation on an integration circuit, the reset operation restoring the integration circuit to a first known state; performing a first current integration operation at the integration circuit, the integration operation operative to integrate a first input current corresponding to a difference between a reference current and a measured first device current flowing through the drive transistor or the light emitting device of a selected one of the pixel circuits; storing a first voltage corresponding to the first current integration operation on a first storage capacitor; performing a second reset operation on the integration circuit, the reset operation restoring the integration circuit to a second known state; performing a second current integration operation at the integration circuit, the integration operation operative to integrate a second input current corresponding to the leakage current on a reference line; storing a second voltage corresponding to the second current integration operation on a second storage capacitor; generating an amplified output voltage corresponding to the difference between the first voltage and the second voltage using one or more amplifiers; and quantizing the amplified output voltage.