Solid-state imaging device and imaging device with combined dynamic vision sensor and imaging functions
An imaging device includes a plurality of unit pixels or pixels, with each pixel separated from every other unit pixel by an isolation structure. Each unit pixel includes a photoelectric conversion unit, a pixel imaging signal readout circuit, and an address event detection readout circuit. A first transfer transistor selectively connects the photoelectric conversion unit to the pixel imaging signal readout circuit, and a second transfer transistor selectively connects the photoelectric conversion unit to the address event detection readout circuit. The photoelectric conversion unit, the pixel imaging signal readout circuit, the address event detection readout circuit, and the first and second transfer transistors for a given pixel are located within a pixel area defined by the isolation structure. The isolation structure may be in the form of a full thickness dielectric trench isolation structure.
1. A light detecting device, comprising:
a pixel array unit, wherein the pixel array unit includes:
a plurality of pixels; and
an isolation structure, wherein a first pixel in the plurality of pixels is separated from one or more neighboring pixels in the plurality of pixels by the isolation structure, and wherein the first pixel includes:
a photoelectric conversion region;
a first transfer transistor;
a second transfer transistor;
a first readout circuit selectively coupled to the photoelectric conversion region by the first transfer transistor; and
a second readout circuit selectively coupled to the photoelectric conversion region by the second transfer transistor,
wherein the first readout circuit includes one or more first components located in a first area of the first pixel at a first side of the photoelectric conversion region in a plan view, and the second readout circuit includes one or more second components located in a second area of the first pixel at a second side of the photoelectric conversion region in the plan view,
wherein the one or more first components includes a floating diffusion, a first amplification transistor, a selection transistor, or a reset transistor, and
wherein the one or more second components includes a first log transistor or a second amplification transistor.
2. The light detecting device of claim 1 , wherein the first side of the photoelectric conversion region is opposite the second side of the photoelectric conversion region.
3. The light detecting device of claim 1 , wherein the second readout circuit includes an address event detection readout circuit.
4. The light detecting device of claim 1 , wherein the first readout circuit includes an imaging signal generation readout circuit.
5. The light detecting device of claim 4 , wherein the pixel array unit includes a plurality of pixel groups, and wherein each pixel within a first pixel group in the plurality of pixel groups is isolated from other pixels in the first pixel group by the isolation structure.
6. The light detecting device of claim 5 , wherein the isolation structure includes a dielectric structure.
7. The light detecting device of claim 6 , wherein the dielectric structure surrounds each pixel within the first pixel group.
8. The light detecting device of claim 1 , wherein the isolation structure includes a full-thickness dielectric trench.
9. The light detecting device of claim 1 , wherein the first area of the first pixel corresponds to a first half of the first pixel.
10. The light detecting device of claim 8 , wherein the second area of the first pixel corresponds to a second half of the first pixel.
11. The light detecting device of claim 1 , wherein the second readout circuit includes a current-to-voltage conversion unit and a subtractor, and wherein the current-to-voltage conversion unit includes the first log transistor and the second amplification transistor.
12. An apparatus, comprising:
a lens; and
a light detecting device comprising a pixel array unit, wherein the pixel array unit includes:
a plurality of pixels; and
an isolation structure, wherein a first pixel in the plurality of pixels is separated from one or more neighboring pixels in the plurality of pixels by the isolation structure, and wherein the pixel includes:
a photoelectric conversion region;
a first transfer transistor;
a second transfer transistor;
a first readout circuit selectively coupled to the photoelectric conversion region by the first transfer transistor; and
a second readout circuit selectively coupled to the photoelectric conversion region by the second transfer transistor,
wherein the first readout circuit includes one or more first components located in a first area of the first pixel at a first side of the photoelectric conversion region in a plan view, and the second readout circuit includes one or more second components located in a second area of the first pixel at a second side of the photoelectric conversion region in the plan view,
wherein the one or more first components includes a floating diffusion, a first amplification transistor, a selection transistor, or a reset transistor, and
wherein the one or more second components includes a first log transistor or a second amplification transistor.
13. The apparatus of claim 12 , wherein the first side of the photoelectric conversion region is opposite the second side of the photoelectric conversion region.
14. The apparatus of claim 12 , wherein the second readout circuit includes an address event detection readout circuit.
15. The apparatus of claim 12 , wherein the first readout circuit includes an imaging signal generation readout circuit.
16. The apparatus of claim 12 , wherein the first area of the first pixel corresponds to a first half of the first pixel.
17. The apparatus of claim 16 , wherein the second area of the first pixel corresponds to a second half of the first pixel.
18. The apparatus of claim 12 , wherein the isolation structure includes a full-thickness dielectric trench.
19. A light detecting device, comprising:
a pixel array unit, wherein the pixel array unit includes:
a plurality of pixels; and
an isolation structure, wherein a first pixel in the plurality of pixels is separated from one or more neighboring pixels in the plurality of pixels by the isolation structure, and wherein the first pixel includes:
a photoelectric conversion region;
a first transfer transistor;
a second transfer transistor;
a first readout circuit selectively coupled to the photoelectric conversion region by the first transfer transistor; and
a second readout circuit selectively coupled to the photoelectric conversion region by the second transfer transistor,
wherein the first readout circuit includes one or more first components located in a first area of the first pixel at a first side of the photoelectric conversion region in a plan view, and the second readout circuit includes one or more second components located in a second area of the first pixel at a second side of the photoelectric conversion region in the plan view,
wherein the one or more first components includes a floating diffusion and one or more of a first amplification transistor, a selection transistor, or a reset transistor, and
wherein the one or more second components includes a first log transistor or a second amplification transistor.
20. The light detecting device of claim 19 , wherein the first side of the photoelectric conversion region is opposite the second side of the photoelectric conversion region.