Patent ID: 8063895
Filing Date: 2011-11-22
Classification: G09G,H01L

Abstract:
1. An active matrix display device comprising: a substrate; a pixel including an EL element, a first TFT and a third TFT; a source signal line; a gate signal line; and a driving circuit including an operation amplifier, a second TFT and a fourth TFT, wherein the second TFT is diode-connected, wherein one of a source and a drain of the first TFT is electrically connected to the EL element, wherein the source signal line is electrically connected to a gate of the first TFT through the third TFT, wherein the gate signal line is electrically connected to a gate of the third TFT, wherein an output terminal of the operation amplifier is electrically connected to the source signal line, wherein one of a source and a drain of the second TFT is electrically connected to an input terminal of the operation amplifier, wherein one of a source and a drain of the fourth TFT is electrically connected to the source signal line, wherein the first TFT has the same polarity as the second TFT.