| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a photosensor that allows performing imaging at high resolution in a semiconductor device including the photosensor.SOLUTION: A semiconductor device includes a photosensor having a photodiode, a first transistor, and a second transistor. The photodiode has a function generating an electrical signal according to the intensity of light. The first transistor accumulates charges in its gate and has a function converting the accumulated charges into an output signal. The second transistor transfers the electrical signal generated from the photodiode to the gate of the first transistor and has a function retaining the charges stored in the gate of the first transistor. The first transistor has a back gate and can change its threshold voltage by changing a potential of the back gate.</p> |
