Backside illuminated image sensor with global shutter and storage capacitor
First Claim
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1. An imaging sensor pixel, comprising:
- a photodiode region disposed within a semiconductor die for accumulating an image charge;
a pixel circuitry region disposed within the semiconductor die between a frontside of the semiconductor die and the photodiode region, the pixel circuitry region overlapping at least a portion of the photodiode region;
an interlinking diffusion region disposed within the semiconductor die, the interlinking diffusion region coupled to the photodiode region and extending towards the frontside of the semiconductor die; and
a storage capacitor included within the pixel circuitry region overlapping the photodiode region and selectively coupled via the interlinking diffusion region to the photodiode region to temporarily store the image charge accumulated thereon.
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Abstract
A backside illuminated imaging sensor pixel includes a photodiode region, a pixel circuitry region, and a storage capacitor. The photodiode region is disposed within a semiconductor die for accumulating an image charge. The pixel circuitry region is disposed on the semiconductor die between a frontside of the semiconductor die and the photodiode region. The pixel circuitry region overlaps at least a portion of the photodiode region. The storage capacitor is included within the pixel circuitry region overlapping the photodiode region and is selectively coupled to the photodiode region to temporarily store image charges accumulated thereon.
179 Citations
20 Claims
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1. An imaging sensor pixel, comprising:
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a photodiode region disposed within a semiconductor die for accumulating an image charge; a pixel circuitry region disposed within the semiconductor die between a frontside of the semiconductor die and the photodiode region, the pixel circuitry region overlapping at least a portion of the photodiode region; an interlinking diffusion region disposed within the semiconductor die, the interlinking diffusion region coupled to the photodiode region and extending towards the frontside of the semiconductor die; and a storage capacitor included within the pixel circuitry region overlapping the photodiode region and selectively coupled via the interlinking diffusion region to the photodiode region to temporarily store the image charge accumulated thereon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of operation of a pixel array including a plurality of pixels wherein each of the pixels includes a backside illuminated complimentary metal-oxide-semiconductor (“
- CMOS”
) imaging sensor, for each of the pixels, the method comprising;accumulating charge within a photodiode region of the pixel generated by light incident upon a backside of the pixel; and transferring the charge accumulated within the photodiode region to a storage capacitor, wherein the storage capacitor is positioned on a frontside of the pixel opposite the backside and overlaps the photodiode region. - View Dependent Claims (11, 12, 13, 14)
- CMOS”
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15. An imaging system comprising:
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a backside illuminated array of imaging pixels wherein each imaging pixel includes; a photodiode region for accumulating an image charge; a storage capacitor coupled to temporarily store the image charge accumulated by the photodiode, the storage capacitor disposed between a frontside of the imaging pixel and the photodiode region; a transfer transistor to selectively couple the photodiode region to the storage capacitor; control circuitry coupled to the backside illuminated array of imaging pixels to generate a shutter signal for selectively enabling the transfer transistor of one or more of the imaging pixels; and readout circuitry coupled to the backside illuminated array of imaging pixels to selectively readout the image charge. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification