Patent ID: 9685476
Date: 2017-06-20
CPC Classifications: H01L

Claim:
1. An imaging device comprising a plurality of pixels, each of the plurality of pixels comprising: a photodiode; a first transistor; a second transistor; a third transistor; and a fourth transistor, wherein one electrode of the photodiode is electrically connected to one of a source electrode and a drain electrode of the first transistor, wherein the other of the source electrode and the drain electrode of the first transistor is electrically connected to a gate electrode of the second transistor and one of a source electrode and a drain electrode of the third transistor, wherein one of a source electrode and a drain electrode of the second transistor is electrically connected to one of a source electrode and a drain electrode of the fourth transistor, wherein the first transistor, the second transistor, and the third transistor each comprise a back gate electrode, wherein the back gate electrode of the first transistor is electrically connected to a wiring that supplies a potential higher than a source potential of the first transistor and a potential lower than the source potential of the first transistor, wherein the back gate electrode of the second transistor is electrically connected to a wiring that supplies a potential higher than a source potential of the second transistor, and wherein the back gate electrode of the third transistor is electrically connected to a wiring that supplies a potential higher than a source potential of the third transistor and a potential lower than the source potential of the third transistor.