Patent ID: 7569885

Claim:
An electro-optical device comprising: an element substrate, wherein a plurality of data lines, a plurality of scanning lines, and a plurality of pixel transistors connected to the scanning lines and the data lines are disposed on the element substrate, wherein a sensor element, a sensor signal line for outputting a signal from the sensor element, a common wiring line, and a capacitive-coupling-operation bidirectional diode element are disposed on the element substrate, the capacitive-coupling-operation bidirectional diode element including two capacitive-coupling-operation diode elements each including a semiconductor element including a source electrode, a drain electrode, a semiconductor layer having a channel region, and a gate electrode facing the channel region with a gate insulating film disposed therebetween, and a capacitor element arranged between one of the source electrode and the drain electrode and the gate electrode, the two capacitive-coupling-operation diode elements being electrically connected in opposite directions to each other, the sensor signal line is electrically connected to the common wiring line via the capacitive-coupling-operation bidirectional diode element, and a control wiring line for supplying a gate voltage setting the semiconductor elements of the capacitive-coupling-operation bidirectional diode element to be in a non-conducting state is disposed for the capacitive-coupling-operation bidirectional diode element.