Patent ID: 11973102
Assignee: SONY SEMICONDUCTOR SOLUTIONS CORPORATION
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  A | IPC A  H

Claim 6:
7. An imaging device, comprising:
a first semiconductor substrate having a first surface and a second surface and including a sensor pixel that performs photoelectric conversion;
a second semiconductor substrate having a third surface and a fourth surface and including a readout circuit that outputs a pixel signal based on electric charge outputted from the sensor pixel, the second semiconductor substrate being stacked on the first semiconductor substrate with the first surface and the third surface opposed to each other; and
a wiring layer provided between the first semiconductor substrate and the second semiconductor substrate and including a first wiring line and a second wiring line that are electrically coupled to each other, one of the first wiring line and the second wiring line being in an electrically floating state while another of the first wiring line and the second wiring line is electrically coupled to a transistor provided to the first semiconductor substrate or the second semiconductor substrate,
wherein the sensor pixel includes a light receiver, a transfer transistor, and a floating diffusion, the transfer transistor being electrically coupled to the light receiver, the floating diffusion temporarily holding electric charge outputted from the light receiver through the transfer transistor, and
wherein the readout circuit includes a reset transistor, an amplification transistor, a selection transistor, and a conversion efficiency switching transistor, the reset transistor resetting a potential of the floating diffusion to a predetermined position, the amplification transistor generating a signal of a voltage as the pixel signal, the voltage corresponding to a level of the electric charge held by the floating diffusion, the selection transistor controlling a timing at which the pixel signal is outputted from the amplification transistor, the conversion efficiency switching transistor changing electric charge-voltage conversion efficiency at the floating diffusion.