Imaging element and imaging apparatus
An imaging element comprises a photoelectric conversion unit formed in a pixel region and configured to convert light into electrical charge. Further, the imaging element includes a transistor formed in the pixel region and configured to transfer electric charge from the photoelectric conversion unit. The photoelectric conversion unit of the imaging element may be connected to a well of the pixel region, where the well of the pixel region has a negative potential.
1. An imaging device comprising:
a first substrate including:
a pixel that outputs a pixel signal, the pixel including:
a photoelectric conversion unit coupled to a first well that receives a first potential, wherein the first potential is a negative potential relative to a ground potential; and
a transfer transistor coupled to the photoelectric conversion unit; and
a second substrate including:
a peripheral circuit coupled to the pixel, wherein the peripheral circuit is coupled to a second well that receives a second potential greater than the first potential.
2. The imaging device according to claim 1 , wherein the peripheral circuit includes an analog to digital converter coupled to the pixel through a signal line.
3. The imaging device according to claim 1 , wherein the peripheral circuit includes a current source circuit.
4. The imaging device according to claim 1 , wherein the second potential is zero or negative.
5. The imaging device according to claim 1 , wherein the pixel is coupled to a first power supply potential.
6. The imaging device according to claim 5 , wherein the peripheral circuit is coupled to a second power supply potential.
7. The imaging device according to claim 6 , wherein the first power supply potential is the same as the second power supply potential.
8. The imaging device according to claim 1 , wherein the first substrate and the second substrate are stacked.
9. The imaging device according to claim 1 , wherein the pixel further comprises a floating diffusion, a reset transistor, an amplifier transistor, and a select transistor.
10. The imaging device according to claim 1 , wherein the first substrate includes a switch coupled to a gate of the transfer transistor.
11. The imaging device according to claim 10 , wherein the gate of the transfer transistor selectively receives, via the switch, a power supply potential or a third potential lower than the first potential.
12. The imaging device according to claim 1 , wherein the second substrate includes a switch coupled to a gate of the transfer transistor.
13. The imaging device according to claim 12 , wherein the gate of the transfer transistor selectively receives, via the switch, a power supply potential or a third potential lower than the first potential.
14. An imaging device comprising:
a first substrate including:
a pixel that outputs a pixel signal, the pixel including:
a photoelectric conversion unit coupled to a first well that receives a first potential, wherein the first potential is a negative potential; and
a transfer transistor coupled to the photoelectric conversion unit; and
a second substrate including:
a peripheral circuit coupled to the pixel, wherein the peripheral circuit is coupled to a second well that receives a second potential greater than the first potential, wherein the peripheral circuit includes a negative voltage generator that provides the first potential.
15. An apparatus, comprising:
a converter; and
an imaging device including:
a first substrate including;
a pixel that outputs a pixel signal, the pixel including:
a photoelectric conversion unit coupled to a first well that receives a first potential, wherein the first potential is a negative potential relative to a ground potential; and
a transfer transistor coupled to the photoelectric conversion unit; and
a second substrate including:
a peripheral circuit coupled to the pixel, wherein the peripheral circuit is coupled to a second well that receives a second potential greater than the first potential.
16. The apparatus according to claim 15 , wherein the peripheral circuit includes a negative voltage generator that provides the first potential.
17. The apparatus according to claim 15 , wherein the peripheral circuit includes an analog to digital converter coupled to the pixel through a signal line.
18. The apparatus according to claim 15 , wherein the peripheral circuit includes a current source circuit.
19. The apparatus according to claim 15 , wherein the second potential is zero or negative.
20. The apparatus according to claim 15 , wherein the pixel is coupled to a first power supply potential.