Patent ID: 7173590
Filing Date: 2007-02-06
Classification: G02B,G09G,H01L,H04B

Abstract:
1. A pixel circuit disposed at a point at which a scanning line and a signal line intersect with each other, comprising: an electro-optical element; a holding capacitor; and five N-channel thin film transistors including a sampling transistor, a drive transistor, a switching transistor, a first detection transistor and a second detection transistor; wherein, said holding capacitor being connected between the source and the gate of said drive transistor; said electro-optical element being connected between the source of said drive transistor and a predetermined cathode potential; said first detection transistor being connected between the source of said drive transistor and a first ground potential; said second detection transistor being connected between the gate of said drive transistor and a second ground potential; said sampling transistor being connected between said gate of said drive transistor and said signal line; said switching transistor being connected between the drain of said drive transistor and a predetermined power supply potential; said sampling transistor operating, when selected by said scanning line, to sample an input signal from said signal line and supply the sampled input signal so as to be held into said holding capacitor; said drive transistor driving said electro-optical element with current in response to the signal potential held by said holding capacitor; said switching transistor being rendered conducting, when selected by said scanning line, to supply current from said power supply potential to said drive transistor; and said first and second detection transistors operating, when selected by said scanning line, to detect a threshold voltage of said drive transistor prior to the driving of said electro-optical element with the current and supply the detected potential so as to be held into said holding capacitor in order to cancel an influence of the threshold voltage in advance.