Patent ID: 7659872

Claim:
A pixel circuit for being positioned at a point of intersection between a row scanning line for supplying a control signal and a column signal line for supplying a video signal, comprising at least: a sampling transistor; a pixel capacitance connected to said sampling transistor; a drive transistor connected to said pixel capacitance; a light-emitting device connected to said drive transistor; wherein said sampling transistor is turned on in response to the control signal supplied from said scanning line to sample the video signal supplied from said signal line into said pixel capacitance, said pixel capacitance applies an input voltage to a gate of said drive transistor depending on the sampled video signal, said drive transistor supplies an output current depending on said input voltage to said light-emitting device, said output current having dependency on a carrier mobility in a channel region of said drive transistor, said light-emitting device emits light at a luminance level depending on said video signal in response to the output current supplied from said drive transistor, said pixel circuit further including correcting means for correcting the input voltage sampled in said pixel capacitance in order to cancel out the dependency of said output current on the carrier mobility, wherein said correcting means operates depending on the control signal supplied from said scanning line to extract the output current from said drive transistor and introduce the extracted output current into a capacitance of said light-emitting device and said pixel capacitance for thereby correcting the input voltage, and an additional capacitance added to the capacitance of said light-emitting device, wherein a portion of the output current extracted from said drive transistor flows into said additional capacitance to give a time margin to operation of said correcting means.