Semiconductor device and method of driving semiconductor device

A semiconductor device comprising:

• a first wiring;
• a second wiring;
• a third wiring;
• a fourth wiring;
• an input terminal;
• an output terminal;
• an element comprising a first electrode and a second electrode;
• a first transistor;
• a second transistor;
• and
• a third transistor,
• wherein one of a source and a drain of the first transistor is connected to the input terminal and an other of the source and the drain of the first transistor is connected to the output terminal,
• wherein the second transistor is configured to be controlled by the third wiring to control a connection between a gate of the first transistor and the first wiring, and between the first electrode and the first wiring,
• wherein the third transistor is configured to be controlled by the fourth wiring to control a connection between the second electrode and the second wiring,
• wherein the semiconductor device is configured so that, when both of the second transistor and the third transistor are on, a potential of the first wiring is varied in accordance with a potential of the second wiring,
• wherein the semiconductor device is designed so that, when the second transistor is off, the first electrode is electrically floating, and when the third transistor is off, the second electrode is electrically floating, and
• wherein the element is a capacitor.