Patent ID: 7893895
Filing Date: 2011-02-22
Classification: G09G

Abstract:
1. A pixel circuit disposed at a part where a scanning line and a signal line intersect each other, said pixel circuit comprising: an electrooptic element; a drive transistor; a sampling transistor; a retaining capacitance; said drive transistor having a gate connected to an input node, a source connected to an output node, and a drain connected to a predetermined power supply potential; said electrooptic element having one terminal connected to said output node and another terminal connected to a predetermined potential; said sampling transistor being connected between said input node and said signal line; said retaining capacitance being connected to said input node; said sampling transistor operating when selected by said scanning line, sampling an input signal from said signal line, and retaining the input signal in said retaining capacitance; said drive transistor supplying a driving current to said electrooptic element according to a signal potential retained in said retaining capacitance; and a compensating circuit for compensating for a decrease in said driving current which decrease is attendant on a secular change of said drive transistor; said compensating circuit detecting a decrease in said driving current from a side of said output node, and feeding back a result of detection to a side of said input node. wherein said compensating circuit detects a voltage drop occurring in said electrooptic element according to said driving current from the side of said output node, obtains a difference by comparing a level of said input signal with a level of the detected voltage drop, and adds a potential corresponding to said difference to said signal potential retained in said retaining capacitance.