Patent ID: 7759628

Claim:
A detection device comprising: a substrate; a plurality of scanning lines; a plurality of detection lines; a plurality of first power supply lines; a plurality of second power supply lines; and a plurality of unit circuits, which are arranged on the substrate, wherein the plurality of unit circuits are provided at positions corresponding to intersections of the scanning lines and the detection lines, wherein each of the unit circuits includes a first transistor, a detection element, a second transistor, and a first capacitive element, wherein the first transistor has a first terminal that is connected to a corresponding one of the detection lines and a second terminal that is connected to a corresponding one of the first power supply lines, and supplies the corresponding one of the detection lines with a detection signal corresponding to the electric potential of a gate electrode thereof, wherein the detection element is connected to the gate electrode of the first transistor and varies the electric potential of the gate electrode of the first transistor in accordance with an external factor, wherein the second transistor has a first terminal that is connected to the gate electrode of the first transistor and a second terminal that is connected to a corresponding one of the second power supply lines, and has a gate electrode that is connected to a corresponding one of the scanning lines, wherein the first capacitive element holds the electric potential of the gate electrode of the first transistor, wherein each of the scanning lines is formed in a layer that is different from a layer in which the gate electrode of the first transistor and the gate electrode of the second transistor are formed, and wherein each of the scanning lines is arranged so as to at least partly overlap the gate electrode of the second transistor in plan view.