Imaging device and imaging system
AssigneeCanon Kabushiki Kaisha
InventorsHiroki Hiyama, Masanori Ogura, Seiichiro Sakai
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Abstract
An object of the present invention is to prevent a sensitivity difference between pixels. There are disposed plural unit cells each including plural photodiodes 101A and 101B, plural transfer MOSFETs 102A and 102B arranged corresponding to the plural photodiodes, respectively, and a common MOSFET 104 which amplifies and outputs signals read from the plural photodiodes. Each pair within the unit cell, composed of the photodiode and the transfer MOSFET provided corresponding to the photodiode, has translational symmetry with respect to one another. Within the unit cell, there are included a reset MOSFET and selecting MOSFET.
Claims15
An imaging device comprising a plurality of pixels,
- wherein each of the plurality of pixels includes a photoelectric conversion region, a transfer MOS transistor and a floating diffusion region, the transfer MOS transistor including a channel region and a gate electrode provided on the channel region,
- wherein the plurality of pixels includes a first pixel and a second pixel, the photoelectric conversion region of the first pixel and the photoelectric conversion region of the second pixel being arranged along a first direction,
- wherein the photoelectric conversion region, the channel region of the transfer MOS transistor and the floating diffusion region of the first pixel are arranged in translational symmetry with respect to the photoelectric conversion region, the channel region of the transfer MOS transistor and the floating diffusion region of the second pixel,
- wherein the floating diffusion region of the first pixel is electrically connected to the floating diffusion region of the second pixel,
- wherein a part of the gate electrode of the transfer MOS transistor of the first pixel is provided on a region between the photoelectric conversion region of the first pixel and the photoelectric conversion region of the second pixel, and
- wherein the photoelectric conversion region of the first pixel and the floating diffusion region of the first pixel are arranged along a second direction crossing the first direction.
The imaging device according to 1, further comprising
- a plurality of well contact portions configured to supply a voltage to a well in which the photoelectric conversion region and the floating diffusion region of each pixel are provided, and
- wherein a number of the well contact portions is smaller than a number of the plurality of pixels.
An imaging device comprising a plurality of pixels,
- wherein each of the plurality of pixels includes a photoelectric conversion region, a transfer MOS transistor and a floating diffusion region, the transfer MOS transistor including a channel region and a gate electrode provided on the channel region thereof,
- wherein the plurality of pixels includes a first pixel, a second pixel and a third pixel, the photoelectric conversion region of the first pixel and the photoelectric conversion region of the second pixel being arranged along a first direction,
- wherein the photoelectric conversion region, the channel region of the transfer MOS transistor and the floating diffusion region of the first pixel are arranged in translational symmetry with respect to the photoelectric conversion region, the channel region of the transfer MOS transistor and the floating diffusion region of the second pixel,
- wherein the floating diffusion region of the first pixel is electrically connected to the floating diffusion region of the second pixel,
- wherein a conductive portion electrically connected to the gate electrode of the transfer MOS transistor of the first pixel is provided on a region between the photoelectric conversion region of the first pixel and the photoelectric conversion region of the second pixel, and
- wherein the photoelectric conversion region of the first pixel and the floating diffusion region of the first pixel are arranged along a second direction crossing the first direction.
Dependencies are inferred from the claim text.