公开(公告)号：US20250048002A1

公开(公告)日：2025-02-06

申请号：US18363469

申请日：2023-08-01

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Hiroaki Ebihara ,  Nobuhiro Yanagisawa ,  Satoshi Sakurai ,  Tomoyasu Tate ,  Naoki Kitazawa ,  Kohei Harada

IPC: H04N25/78 ,  H04N25/709 ,  H04N25/76

Abstract: An imaging system comprises a pixel array configured to generate a plurality of image charge voltage signals in response to incident light, and readout circuitry coupled to the pixel array, the readout circuitry including a plurality of column unit cells. Each column unit cell comprises at least one of a plurality of comparators, wherein each comparator is coupled to receive the ramp signal from the ramp generator through a ramp signal line. Each column unit cell also comprises a compensation current unit coupled to the ramp signal line, each compensation current unit comprising a compensation current source and a compensation current switch coupled to the compensation current source, wherein the compensation current source and the compensation current switch are coupled between a first node on the ramp signal line and a second node.

公开(公告)号：US20240275906A1

公开(公告)日：2024-08-15

申请号：US18168630

申请日：2023-02-14

Applicant: OmniVision Technologies, Inc.

Inventor： Masao Sambongi ,  Nobuhiro Yanagisawa

IPC: H04N5/16 ,  G06V10/60

CPC classification number: H04N5/165 ,  G06V10/60

Abstract: An image sensor includes a pixel array including at least one light-shielded area where no light enters and an imaging area where light enters, wherein each pixel includes a photoelectric conversion element, a black level processing unit that corrects an output of each pixel in the imaging area, and a memory that stores a predetermined black level reference for each pixel in the imaging area. The processing unit calculates a Slope, which is determined by an average output value at imaging of pixels in the at least one light-shielded area taken during imaging and a reference average output value of pixels in the at least one light-shielded area under certain conditions taken prior to imaging, and correct an output of each pixel in the imaging area using the predetermined black level reference and the Slope.