Patent ID: 9704886
Date: 2017-07-11
CPC Classifications: H01L,H03K

Claim:
1. A signal processing device comprising: a first transistor; a second transistor; a third transistor; a semiconductor layer; a first wiring; a second wiring; and a third wiring, wherein the first wiring, the second wiring, and the third wiring each overlap with the semiconductor layer, wherein the first wiring, the second wiring, and the third wiring do not overlap with each other, wherein potentials of the first to third wirings change conductivities of at least portions of the semiconductor layer that overlap with the first wiring, the second wiring, and the third wiring, wherein gates of the first to third transistors are electrically connected to the semiconductor layer, wherein each of the gates of the first to third transistors is brought into a floating state depending on the conductivities of the portions of the semiconductor layer, and wherein conduction between sources and drains of the first to third transistors is controlled by potentials of the respective gates in the floating state.