Patent ID: 8654111

Claim:
A pixel circuit that is located where a scan line in a row supplying a control signal and a signal line in a column supplying a video signal cross each other and that includes at least a sampling transistor, a pixel capacitor connected to the sampling transistor, a drive transistor connected to the pixel capacitor, and a light-emitting device connected to the drive transistor, wherein the sampling transistor is brought into conduction in response to the control signal supplied from the scan line and samples the video signal supplied from the signal line to the pixel capacitor during a horizontal scanning period assigned to the scan line, wherein the pixel capacitor applies an input voltage to a gate of the drive transistor in response to the sampled video signal, wherein the drive transistor supplies an output current in accordance with the input voltage to the light-emitting device during a predetermined light-emitting period and the output current has dependency on a threshold voltage in a channel region of the drive transistor, and wherein the light-emitting device emits light at brightness in accordance with the video signal by the output current supplied from the drive transistor, wherein the pixel circuit performs a correction during the horizontal scanning period, the correction comprises detecting the threshold voltage of the drive transistor and writing the threshold voltage in the pixel capacitor in order to cancel the dependency of the output current on the threshold voltage, wherein the sampling transistor samples the video signal during a signal supplying period when the signal line is at a potential of the video signal in the horizontal scanning period, wherein the correction further comprises detecting the threshold voltage of the drive transistor and writing the threshold voltage in the pixel capacitor during a signal fixed period when the signal line is at a certain potential in the horizontal scanning period, and wherein the correction is performed during signal fixed periods in horizontal scanning periods assigned to other scan lines and charges the pixel capacitor to the threshold voltage in a timesharing manner in each signal fixed period.