Patent ID: 9552796
Date: 2017-01-24
CPC Classifications: G09G

Claim:
1. A degradation compensating pixel circuit, comprising: an organic light emitting diode (OLED); a driving circuit comprising a first capacitor and a first transistor, the first capacitor being configured to be charged in response to a data signal and a scan signal, the first transistor being configured to drive the OLED according to a first voltage between first and second terminals of the first capacitor, the first terminal of the first capacitor being configured to receive a supply voltage, the second terminal of the first capacitor being coupled to a gate terminal of the first transistor; and a degradation compensating circuit coupled to a source terminal of the first transistor and the gate terminal of the first transistor, the degradation compensating circuit being configured to change the first voltage according to a first current of the first transistor, wherein the degradation compensating circuit comprises a second transistor, a third transistor, and a second capacitor, wherein a source terminal of the second transistor is configured to receive a reference voltage, a gate terminal of the second transistor is configured to receive a feedback initialization signal, and a drain terminal of the second transistor is coupled to a first node, wherein a source terminal of the third transistor is coupled to the first node, a gate terminal of the third transistor is configured to receive a feedback signal, and a drain terminal of the third transistor is coupled to the source terminal of the first transistor, and wherein a first terminal of the second capacitor is coupled to the first node, and a second terminal of the second capacitor is coupled to the gate terminal of the first transistor.