Sensor, input device, and input/output device

A sensor comprising:

• a sensor element;
• a sensor circuit electrically connected to the sensor element;
• and
• a flexible base layer supporting the sensor element and the sensor circuit,
• wherein the sensor circuit comprises a first transistor, a second transistor, and a third transistor,
• wherein a gate of the first transistor is electrically connected to one of a source and a drain of the third transistor and to a first electrode of the sensor element,
• wherein one of a source and a drain of the first transistor is electrically and directly connected to a second electrode of the sensor element and to a first wiring through which a control signal capable of controlling a potential of the second electrode of the sensor element is configured to be supplied,
• wherein the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor,
• wherein a gate of the second transistor is electrically connected to a second wiring through which a selection signal is configured to be supplied,
• wherein the other of the source and the drain of the second transistor is electrically connected to a third wiring through which a sensor signal is configured to be supplied,
• wherein a gate of the third transistor is electrically connected to a fourth wiring through which a reset signal is configured to be supplied,
• wherein the other of the source and the drain of the third transistor is electrically connected to a fifth wiring through which a ground potential is configured to be supplied, and
• wherein a capacitance of the sensor element is configured to be changed when an object is proximate to the first electrode of the sensor element or the second electrode of the sensor element.

An input/output device comprising:

• a flexible input device comprising:
• a plurality of sensor units that comprise window portions transmitting visible light and are arranged in a matrix;
• and
• a first flexible base layer supporting the plurality of sensor units;
• and
• a display portion comprising a plurality of pixels that are arranged in a matrix and overlap with the window portions and a second flexible base layer supporting the plurality of pixels,
• wherein each of the plurality of sensor units comprises a sensor element and a sensor circuit electrically connected to the sensor element,
• wherein the sensor circuit comprises a first transistor, a second transistor, and a third transistor,
• wherein a gate of the first transistor is electrically connected to one of a source and a drain of the third transistor and to a first electrode of the sensor element,
• wherein one of a source and a drain of the first transistor is electrically and directly connected to a second electrode of the sensor element and to a first wiring through which a control signal capable of controlling a potential of the second electrode of the sensor element is configured to be supplied,
• wherein the other of the source and the drain of the first transistor is electrically connected to one of a source and a drain of the second transistor,
• wherein a gate of the second transistor is electrically connected to a second wiring,
• wherein the other of the source and the drain of the second transistor is electrically connected to a third wiring,
• wherein a gate of the third transistor is electrically connected to a fourth wiring,
• wherein the other of the source and the drain of the third transistor is electrically connected to a fifth wiring, and
• wherein a capacitance of the sensor element is configured to be changed when an object is proximate to the first electrode of the sensor element or the second electrode of the sensor element.