公开(公告)号：US20240055463A1

公开(公告)日：2024-02-15

申请号：US17886945

申请日：2022-08-12

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Takayuki Goto

IPC: H01L27/146

CPC classification number: H01L27/14643 ,  H01L27/14603 ,  H01L27/1463 ,  H01L27/14636 ,  H01L27/14689

Abstract: A pixel cell for an image sensor including a first semiconductor substrate, a photodiode, and a transfer gate is described. The first semiconductor substrate includes a first side and a second side. The first side is opposite the second side. The photodiode is disposed within the first semiconductor substrate between the first and the second side. The transfer gate is disposed proximate to the first side of the first semiconductor substrate. The transfer gate includes a planar region. The first side of the semiconductor substrate is disposed between the planar region and the photodiode. A lateral area of the photodiode is less than or equal to a lateral area of the planar region of the transfer gate.

公开(公告)号：US11871132B2

公开(公告)日：2024-01-09

申请号：US16870687

申请日：2020-05-08

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Badrinath Padmanabhan ,  Boyd Fowler ,  Alireza Bonakdar ,  Richard Mann

IPC: H04N25/705 ,  H01L27/146 ,  H04N25/75 ,  H04N25/778

CPC classification number: H04N25/705 ,  H01L27/14609 ,  H01L27/14643 ,  H04N25/75 ,  H04N25/778

Abstract: In some embodiments, an imaging system is provided. The imaging system comprises an image sensor, a light source, control circuitry, and function logic. The image sensor comprises a pixel array that includes a plurality of polarization pixel cells and a plurality of time-of-flight pixel cells. The light source is configured to emit light pulses to an object. The control circuitry is coupled to the light source and the pixel array, and is configured to synchronize a timing of the emission of the light pulses with sensing of photons reflected from the object by the plurality of time-of-flight pixel cells to generate depth information. The function logic is configured to determine a set of ambiguous surface normals using signals generated by the plurality of polarization pixel cells, and to disambiguate the set of ambiguous surface normals using the depth information to generate a three-dimensional shape image.

公开(公告)号：US11869906B2

公开(公告)日：2024-01-09

申请号：US16946743

申请日：2020-07-02

Applicant: OmniVision Technologies, Inc.

Inventor： Seong Yeol Mun ,  Heesoo Kang

IPC: H01L27/146

CPC classification number: H01L27/1461 ,  H01L27/14643 ,  H01L27/14689

Abstract: A pixel cell with an elevated floating diffusion region is formed to reduce diffusion leakage (e.g., gate induced drain leakage, junction leakage, etc.). The floating diffusion region can be elevated by separating a doped floating diffusion region from the semiconductor substrate by disposing an intervening layer (e.g., undoped, lightly doped, etc.) on the semiconductor substrate and beneath the doped floating diffusion region. For instance, the elevated floating diffusion region can be formed by stacked material layers composed of a lightly or undoped base or intervening layer and a heavy doped (e.g., As doped) “elevated” layer. In some examples, the stacked material layers can be formed by first and second epitaxial growth layers.

公开(公告)号：US11869267B2

公开(公告)日：2024-01-09

申请号：US17512106

申请日：2021-10-27

Applicant: OmniVision Technologies, Inc.

Inventor： Jau-Jan Deng ,  Kuang-Ju Wang ,  Chun-Jen Wei

IPC: G06K9/00 ,  G06K9/46 ,  G02B3/00 ,  G02B5/00 ,  G02B5/20 ,  G06V40/13 ,  G06V10/40 ,  G06V40/12

CPC classification number: G06V40/1318 ,  G02B3/0037 ,  G02B5/003 ,  G02B5/208 ,  G06V10/40 ,  G06V40/1335 ,  G06V40/1365

Abstract: A multiple-lens optical fingerprint reader for reading fingerprints through a display has a spacer; and multiple microlenses with concave and convex surfaces in a microlens array, each microlens of multiple lenses focuses light arriving at that microlens from a finger adjacent the display through the spacer forms an image on associated photosensors on a photosensor array of an image sensor integrated circuit. A method of verifying identity of a user includes illuminating a finger of the user with an OLED display; focusing light from the finger through arrayed microlenses onto a photosensor array, reading the array into overlapping electronic fingerprint images; extracting features from the overlapping fingerprint images or from a stitched fingerprint image, and comparing the features to features of at least one user in a library of features and associated with one or more fingers of one or more authorized users.

公开(公告)号：US11862651B2

公开(公告)日：2024-01-02

申请号：US16777060

申请日：2020-01-30

Applicant: OmniVision Technologies, Inc.

Inventor： Alireza Bonakdar ,  Zhiqiang Lin ,  Lindsay Grant

IPC: H01L27/146 ,  G02B3/00 ,  G02B5/20

CPC classification number: H01L27/14629 ,  G02B3/0037 ,  G02B5/201 ,  G02B5/208 ,  H01L27/1463 ,  H01L27/1464 ,  H01L27/14621 ,  H01L27/14627 ,  H01L27/14636 ,  H01L27/14645 ,  H01L27/14685

Abstract: A light-trapping image sensor includes a pixel array and a lens array. The pixel array is formed in and on a semiconductor substrate and including photosensitive pixels each including a reflective material forming a cavity around a portion of semiconductor material to at least partly trap light that has entered the cavity. The cavity has a ceiling at a light-receiving surface of the semiconductor substrate, and the ceiling forms an aperture for receiving the light into the cavity. The lens array is disposed on the pixel array. Each lens of the lens array is aligned to the aperture of a respective cavity to focus the light into the cavity through the aperture.

公开(公告)号：US20230421921A1

公开(公告)日：2023-12-28

申请号：US17849325

申请日：2022-06-24

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Woon Il Choi

IPC: H04N5/378 ,  H04N5/355 ,  H01L27/146

CPC classification number: H04N5/378 ,  H04N5/3559 ,  H01L27/14643 ,  H01L27/14612

Abstract: A pixel circuit includes a photodiode configured to photogenerate image charge in response to incident light. A floating diffusion is coupled to receive the image charge from the photodiode. A transfer transistor is coupled between the photodiode and the floating diffusion to transfer the image charge from the photodiode to the floating diffusion. A reset transistor is coupled between a bias voltage source and the floating diffusion. The reset transistor is configured to be switched in response to a reset control signal. A lateral overflow integration capacitor (LOFIC) including an insulating region disposed between a first metal electrode and a second metal electrode is also included. The first metal electrode is coupled to a bias voltage source. The second metal electrode is coupled to the reset transistor and selectively coupled to the floating diffusion.

公开(公告)号：US11810928B2

公开(公告)日：2023-11-07

申请号：US17322536

申请日：2021-05-17

Applicant: OMNIVISION TECHNOLOGIES, INC.

Inventor： Duli Mao ,  Bill Phan ,  Seong Yeol Mun ,  Yuanliang Liu ,  Alireza Bonakdar ,  Chengming Liu ,  Zhiqiang Lin

IPC: H01L27/146

CPC classification number: H01L27/14605 ,  H01L27/1465 ,  H01L27/14621 ,  H01L27/14623 ,  H01L27/14625 ,  H01L27/14627 ,  H01L27/14685

Abstract: CMOS image sensor with LED flickering reduction and low color cross-talk are disclosed. In one embodiment, an image sensor includes a plurality of pixels arranged in rows and columns of a pixel array that is disposed in a semiconductor substrate. Each pixel includes a plurality of large subpixels (LPDs) and at least one small subpixel (SPD). A plurality of color filters are disposed over individual subpixels. Each individual SPD is laterally adjacent to at least one other SPD.

公开(公告)号：US11784206B2

公开(公告)日：2023-10-10

申请号：US17080780

申请日：2020-10-26

Applicant: OmniVision Technologies, Inc.

Inventor： Hui Zang ,  Gang Chen

IPC: H01L27/146 ,  H01L27/148

CPC classification number: H01L27/14643 ,  H01L27/14603 ,  H01L27/14605 ,  H01L27/14607 ,  H01L27/14614 ,  H01L27/14638 ,  H01L27/14812

Abstract: A pixel-array substrate includes a floating diffusion region and a first photodiode formed in a semiconductor substrate. A top surface of the semiconductor substrate defines a trench 1A and a trench 1B each (i) extending into the semiconductor substrate away from a planar region of the top surface between the trench 1A and the trench 1B and (ii) having a respective distal end, with respect to the floating diffusion region, located between the floating diffusion region and the first photodiode. In a horizontal plane parallel to the top surface and along an inter-trench direction between the trench 1A and the trench 1B, a first spatial separation between the trench 1A and the trench 1B increases with increasing distance from the floating diffusion region.

公开(公告)号：US20230307484A1

公开(公告)日：2023-09-28

申请号：US17701632

申请日：2022-03-22

Applicant: Omnivision Technologies, Inc.

Inventor： Shiyu Sun ,  Yuanwei Zheng ,  Gang Chen ,  Sing-Chung Hu ,  Armin Yazdani

IPC: H01L27/146

CPC classification number: H01L27/14656

Abstract: A pixel cell is formed on a semiconductor substrate having a front surface. The pixel cell includes a photodiode, a floating diffusion region, and a transfer gate. The photodiode is disposed in the semiconductor substrate. The floating diffusion region includes a first doped region disposed in the semiconductor substrate, wherein the first doped region extends from the front surface to a first junction depth in the semiconductor substrate. The transfer gate is configured to selectively couple the photodiode to the floating diffusion region controlling charge transfer between the photodiode and the floating diffusion region. The transfer gate includes a planar gate disposed on the front surface of the semiconductor substrate and a pair of vertical gate electrodes. Each vertical gate electrode extending a gate depth from the planar gate into the semiconductor substrate. The first junction depth is greater than the gate depth.

公开(公告)号：US20230306778A1

公开(公告)日：2023-09-28

申请号：US17702675

申请日：2022-03-23

Applicant: OmniVision Technologies, Inc.

Inventor： Shih-Hsin HSU ,  Jau-Jan DENG

IPC: G06V40/13 ,  G02B1/11 ,  G02B5/20 ,  G02B3/00

CPC classification number: G06V40/1318 ,  G02B1/11 ,  G02B5/208 ,  G02B3/0075

Abstract: An under-display optical fingerprint sensors employing microlens arrays (MLAs) and an opaque aperture layer includes high aspect-ratio metal aperture structures for efficient angular signal filtering and stray light control. Instead of relying on one or more opaque aperture baffle-layers, embodiments disclosed herein utilize an image sensor's inherent metal layers for filtering signals originated from unwanted angular ranges and blocking undesired stray light could achieve similar or better performance with simplified process flow and lower cost. Layers from the sensors' inherent metal layers are brought into the sensing area on purpose to form the high aspect-ratio metal aperture structure. The metal layers in the sensing area may include apertures aligned to apertures in the opaque layer, and may also be grounded.