Patent ID: 7948456
Filing Date: 2011-05-24
Classification: G09G

Abstract:
1. A pixel circuit disposed at an intersection of a scanning line and a signal line, the pixel circuit comprising: a sampling transistor, which samples a video signal from the signal line; a capacitive part, which holds an input voltage that includes the sampled video signal; a drive transistor, which receives the input voltage held by the capacitive part and supplies an output current; and a light-emitting element, which receives the output current supplied by the drive transistor and emits light with a luminance dependent upon the video signal, wherein the input voltage held by the capacitive part is corrected before an emission period, by extracting output current from the drive transistor, and negatively feeding back the extracted output current to the capacitive part, the output current from the drive transistor has dependence on a threshold voltage of the drive transistor as well as a carrier mobility of the drive transistor, and wherein negatively feeding back the extracted output current cancels dependence of the output current on the carrier mobility, and the threshold voltage of the drive transistor is detected and added to the input voltage to cancel the dependence of the output current on the threshold voltage.