Patent ID: 7609234

Claim:
A pixel circuit for active matrix Organic Light-emitting Diodes (OLEDs) comprising: a Voltage Control Current Source (VCCS) configured to drive the OLEDs; a high gain amplifier configured such that a control input signal of the VCCS causes the VCCS to be placed in an ON or OFF state; a storage capacitor located between an input terminal of the high gain amplifier and a data line so as to assign ON-time of the VCCS; and a first switch configured to be controlled through a scan line so as to store the voltage in the storage capacitor and control light-emitting time of the OLEDs, the first switch having one terminal connected to ground (GND) and the other terminal connected to an input terminal of the high gain amplifier; a second switch configured to be controlled through the scan line so as to store voltage in the storage capacitor and control light-emitting time of the OLEDs, the second switch having one terminal connected to the output terminal of the high gain amplifier and the other terminal connected to a power source.