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    Image sensor post processing
    1.
    发明授权
    Image sensor post processing 有权

    公开(公告)号：US11595602B2

    公开(公告)日：2023-02-28

    申请号：US16672427

    申请日：2019-11-01

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Wei Gao ,  Andrew Samuel Berkovich ,  Song Chen ,  Tsung-Hsun Tsai ,  Xinqiao Liu

    IPC: H04N5/378 ,  H04N5/359

    Abstract: Methods and systems for quantizing a physical quantity, such as light, are provided. In one example, an apparatus comprises an analog-to-digital (A/D) converter configured to generate raw digital outputs based on performing at least one of: (1) a first quantization operation to quantize a physical stimulus within a first intensity range based on a first A/D conversion relationship, or (2) a second quantization operation to quantize the physical stimulus within a second intensity range based on a second A/D conversion relationship; and a raw output conversion circuit configured generate a refined digital output based on a raw digital output obtained from the A/D converter and at least one predetermined conversion parameter. The at least one conversion parameter compensates for a discontinuity between the first A/D conversion relationship and the second A/D conversion relationship.

    DIGITAL PIXEL SENSOR
    3.
    发明申请
    DIGITAL PIXEL SENSOR 有权

    公开(公告)号：US20230092325A1

    公开(公告)日：2023-03-23

    申请号：US17931001

    申请日：2022-09-09

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Tsung-Hsun Tsai ,  Song Chen ,  Lyle David Bainbridge ,  Xinqiao Liu

    IPC: H01L27/146 ,  H04N5/378 ,  H04N5/355 ,  H04N5/3745 ,  G02B27/01

    Abstract: In one example, an apparatus comprises a first photodiode, a second photodiode, a first floating diffusion, a second floating diffusion, a quantizer, and a controller. The controller can enable the first photodiode and the second photodiode to generate and accumulate photo charge within an exposure period, and use the quantizer to quantize reset voltages at the first floating diffusion and at the second floating diffusion to generate a first digital reset value and a second digital reset value. After the exposure period ends, the controller can transfer the photo charge from the first photodiode and the second photodiode to, respectively, the first floating diffusion and the second floating diffusion to generate a first signal voltage and a second signal voltage, and quantize the signal voltages into digital signal values using the quantizer. Digital representations can be generated based on the digital reset values and the digital signal values.

    Digital pixel sensor having extended dynamic range
    4.
    发明授权
    Digital pixel sensor having extended dynamic range 有权

    公开(公告)号：US11936998B1

    公开(公告)日：2024-03-19

    申请号：US17072840

    申请日：2020-10-16

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Tsung-Hsun Tsai ,  Lu Jie ,  Xinqiao Liu

    IPC: H04N25/59 ,  H04N25/60

    CPC classification number: H04N25/59 ,  H04N25/60

    Abstract: In one example, an apparatus comprises: a photodiode configured to generate a charge in response to light within an exposure period, a charge sensing unit configured to accumulate at least a part of the charge as an overflow charge, a quantizer, and a controller configured to: within a first time within the exposure period, control the quantizer to perform a first quantization operation to quantize the overflow charge accumulated at the charge sensing unit to generate a first measurement output; within a second time after the first time, and within the exposure period, control the quantizer to perform a second quantization operation to quantize the overflow charge accumulated at the charge sensing unit to generate a second measurement output; and generate a digital output to represent an intensity of the light based on at least one of the first measurement output or the second measurement output.

    Pixel sensor having shared readout structure
    5.
    发明授权
    Pixel sensor having shared readout structure 有权

    公开(公告)号：US11877080B2

    公开(公告)日：2024-01-16

    申请号：US17538092

    申请日：2021-11-30

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Xinqiao Liu ,  Song Chen ,  Tsung-Hsun Tsai

    IPC: H04N25/75 ,  H01L27/146 ,  H04N23/73 ,  H04N25/77 ,  G02B27/01

    CPC classification number: H04N25/75 ,  H01L27/14643 ,  H04N23/73 ,  H04N25/77 ,  G02B27/0172 ,  G02B2027/0178

    Abstract: An apparatus comprises a first photodiode, a second photodiode, a quantizer, a memory, and a controller configured to: set a first exposure period in which the first photodiode generates a first charge; set a second exposure period in which the second photodiode generates a second charge, the second exposure period being set based on the first exposure period and at least one of: a first time associated with a read out operation of the memory to a second apparatus, or a second time associated with a quantization operation by the quantizer; perform, using the quantizer, the first quantization operation of the first charge to generate a first digital output; and perform, using the quantizer, a second quantization operation of the second charge to generate a second digital output.

    HYBRID IMAGE SENSORS WITH MULTIMODE SHUTTERS
    6.
    发明申请
    HYBRID IMAGE SENSORS WITH MULTIMODE SHUTTERS 有权

    公开(公告)号：US20240406600A1

    公开(公告)日：2024-12-05

    申请号：US18328344

    申请日：2023-06-02

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Tsung-Hsun Tsai ,  Lyle David Bainbridge

    IPC: H04N25/766 ,  H04N25/531 ,  H04N25/532 ,  H04N25/771 ,  H04N25/772

    Abstract: One example hybrid image sensor with multimode shutters includes a plurality of pixel arrays, each array of pixels comprising a plurality of pixels, each pixel comprising a light-sensing element configured to generate and store a charge in response to incoming light; each pixel array comprising: a charge storage device configured to receive charge from each of the light-sensing elements of the pixel array; a first plurality of switches, each switch of the first plurality of switches connected between a respective pixel of the pixel array and the charge storage device; a second plurality of switches, the second plurality of switches comprising a high-resolution selection switch and a low-resolution selection switch, each of the high-resolution selection switch and the low-resolution selection switch connected in parallel to an output of the charge storage device; a plurality of pixel output lines, each pixel output line configured to output signals representative of pixel values corresponding to one or more pixel arrays coupled to the respective pixel output line.

    Non-linear quantization at pixel sensor
    9.
    发明授权
    Non-linear quantization at pixel sensor 有权

    公开(公告)号：US11943561B2

    公开(公告)日：2024-03-26

    申请号：US16896130

    申请日：2020-06-08

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Tsung-Hsun Tsai ,  Xinqiao Liu

    IPC: H04N25/533 ,  H04N25/71 ,  H04N25/75

    CPC classification number: H04N25/533 ,  H04N25/745 ,  H04N25/75

    Abstract: In one example, an apparatus comprises: a photodiode to generate a charge in response to light within an exposure period having a first duration; a charge sensing unit to accumulate at least a part of the charge within the exposure period; a quantizer; and a controller to: determine, using the quantizer and within a measurement period having a second duration, whether a first quantity of the at least a part of the charge accumulated at the charge sensing unit exceeds a threshold, and a time it takes for the first quantity to exceed the threshold, wherein the first duration and the second duration are individually programmable; and based on whether the first quantity exceeds the threshold, output a first value representing the time or a second value representing a second quantity of the charge generated by the photodiode within the exposure period to represent an intensity of the light.

    Pixel sensor having hierarchical memory
    10.
    发明授权
    Pixel sensor having hierarchical memory 有权

    公开(公告)号：US11902685B1

    公开(公告)日：2024-02-13

    申请号：US17242152

    申请日：2021-04-27

    Applicant: Meta Platforms Technologies, LLC

    Inventor： Tsung-Hsun Tsai ,  Song Chen ,  Xinqiao Liu

    IPC: H04N5/335 ,  H04N25/63 ,  H04N25/772 ,  H04N25/75

    CPC classification number: H04N25/772 ,  H04N25/63 ,  H04N25/75

    Abstract: In one example, an apparatus comprises an array of pixel cells, each pixel cell including: a photodiode to generate a charge in response to incident light, a charge sensing unit configured to generate a voltage based on the charge, a quantizer configured to generate a digital output based on quantizing the voltage, and an in-pixel memory configured to store the digital output. The apparatus further includes a bus interface, an off-array frame memory, and a frame memory controller configured to: control the frame memory to receive, via the set of parallel interconnects, the digital outputs from the in-pixel memory of each pixel cell of the array of pixel cells; store the digital outputs in the frame memory; fetch the digital outputs from the frame memory; and transmit the digital outputs to a host device via the bus interface.

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