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公开(公告)号：US10834351B2
公开(公告)日：2020-11-10
申请号：US16199887
申请日：2018-11-26
Applicant: OmniVision Technologies, Inc.
Inventor： Rui Wang , Tiejun Dai , Ling Fu , Jiayu Guo
Abstract: An image sensor includes pixel circuitry with a photodiode to receive light and output a pixel signal. The image sensor also includes readout circuitry with a first sample and hold transistor coupled to the pixel circuitry, and a first capacitor coupled to the first sample and hold transistor to receive the pixel signal. A second sample and hold transistor is coupled to the pixel circuitry, and a second capacitor is coupled to the second sample and hold transistor to receive the pixel signal. A first output switch is coupled to output the pixel signal from the first capacitor, and a second output switch is coupled to output the pixel signal from the second capacitor. A boost transistor is coupled to connect the first output switch and the second output switch when the boost transistor is turned on.
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公开(公告)号：US20200169682A1
公开(公告)日：2020-05-28
申请号：US16199887
申请日：2018-11-26
Applicant: OmniVision Technologies, Inc.
Inventor： Rui Wang , Tiejun Dai , Ling Fu , Jiayu Guo
Abstract: An image sensor includes pixel circuitry with a photodiode to receive light and output a pixel signal. The image sensor also includes readout circuitry with a first sample and hold transistor coupled to the pixel circuitry, and a first capacitor coupled to the first sample and hold transistor to receive the pixel signal. A second sample and hold transistor is coupled to the pixel circuitry, and a second capacitor is coupled to the second sample and hold transistor to receive the pixel signal. A first output switch is coupled to output the pixel signal from the first capacitor, and a second output switch is coupled to output the pixel signal from the second capacitor. A boost transistor is coupled to connect the first output switch and the second output switch when the boost transistor is turned on.
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公开(公告)号：US20240357253A1
公开(公告)日：2024-10-24
申请号：US18303479
申请日：2023-04-19
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhe Gao , Ling Fu , Qing Qin , Zhiyong Zhan , Tiejun Dai
Abstract: A pixel circuit includes a photodiode configured to photo generate image charge in response to incident light, a floating diffusion coupled to receive the image charge from the photodiode, a transfer transistor coupled between the photodiode and the floating diffusion to transfer the image charge from the photodiode to the floating diffusion, a reset transistor coupled between a variable voltage source and the floating diffusion, wherein the reset transistor is configured to be switched in response to a reset control signal, and a lateral overflow integration capacitor (LOFIC) coupled between the variable voltage source and the floating diffusion. The variable voltage source is configured to output a high-voltage level during a high conversion gain (HCG) reset signal readout and an HCG image signal readout, and a mid-voltage level during a LOFIC image signal readout and a LOFIC reset signal readout.
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Patent Agency Ranking
公开(公告)号：US20230283928A1
公开(公告)日：2023-09-07
申请号：US18314748
申请日：2023-05-09
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhe Gao , Tiejun Dai , Ling Fu , Qing Qin , Andreas Suess
IPC: H04N25/772 , H01L27/146 , H04N25/75 , H04N25/79 , H04N25/443 , H04N25/445
CPC classification number: H04N25/772 , H01L27/14612 , H01L27/1463 , H04N25/75 , H04N25/79 , H04N25/443 , H04N25/445
Abstract: An optical sensor includes a pixel array of pixel cells. Each pixel cell includes photodiodes to photogenerate charge in response to incident light and a source follower to generate an image data signal in response to the charge photogenerated from the photodiodes. An image readout circuit is coupled to the pixel cells to read out the image data signal generated from the source follower of at least one of the pixel cells of a row of the pixel array. An event driven circuit is coupled to the pixel cells to read out the event data signals generated in response to the charge from the photodiodes of another row of the pixel cells of the pixel array. The image readout circuit is coupled to read out the image data signal and the event driven circuit is coupled to read out the event data signals from pixel array simultaneously.
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公开(公告)号：US11716547B2
公开(公告)日：2023-08-01
申请号：US17530316
申请日：2021-11-18
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhe Gao , Ling Fu , Yu-Shen Yang , Tiejun Dai
Abstract: A switch driver circuit includes a plurality of pullup transistors. The plurality of pullup transistors includes a first pullup transistor coupled between a voltage supply and a first output node. A plurality of pulldown transistors includes a first pulldown transistor coupled between the first output node and a ground node. A slope control circuit is coupled to the ground node. A plurality of global connection switches includes a first global connection switch coupled between the first output node and the slope control circuit.
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公开(公告)号：US11430828B2
公开(公告)日：2022-08-30
申请号：US17125619
申请日：2020-12-17
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhe Gao , Ling Fu , Qing Qin , Tiejun Dai
IPC: H04N5/351 , H04N5/374 , H04N5/378 , H04N5/262 , H01L27/146 , H04N5/3745
Abstract: An event driven sensor includes an arrangement of photodiodes including an inner portion laterally surrounded by an outer portion. An outer pixel cell circuit is coupled to generate an outer pixel value in response to photocurrent generated by the outer portion. The outer pixel value is a binned signal representative of an average value of brightness of incident light on the arrangement of photodiodes. An inner pixel cell circuit is coupled to the inner portion to generate an inner pixel value in response to photocurrent generated by from the inner portion. An event driven circuit is coupled to the outer pixel cell circuit and the inner pixel cell circuit. The event driven circuit is coupled to generate an output signal responsive to an inner brightness indicated by the inner pixel value relative to an outer brightness indicated by the outer pixel value.
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公开(公告)号：US20220201236A1
公开(公告)日：2022-06-23
申请号：US17125630
申请日：2020-12-17
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Zhe Gao , Tiejun Dai , Ling Fu , Qing Qin , Andreas Suess
IPC: H04N5/3745 , H01L27/146
Abstract: An optical sensor includes a pixel array of pixel cells. Each pixel cell includes photodiodes to photogenerate charge in response to incident light and a source follower to generate an image data signal in response to the charge photogenerated from the photodiodes. An image readout circuit is coupled to the pixel cells to read out the image data signal generated from the source follower of at least one of the pixel cells of a row of the pixel array. An event driven circuit is coupled to the pixel cells to read out the event data signals generated in response to the charge from the photodiodes of another row of the pixel cells of the pixel array. The image readout circuit is coupled to read out the image data signal and the event driven circuit is coupled to read out the event data signals from pixel array simultaneously.
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公开(公告)号：US11252346B1
公开(公告)日：2022-02-15
申请号：US17037282
申请日：2020-09-29
Applicant: OMNIVISION TECHNOLOGIES, INC.
Inventor： Tiejun Dai , Zhe Gao , Ling Fu
IPC: H04N5/341 , H04N5/369 , H01L27/146 , H04N5/378
Abstract: Switching techniques for fast voltage settling in image sensors are described. In one embodiment, a transfer gate (TX) driver circuit of an image sensor includes a TX driver configured to provide a TX driver voltage to a plurality of pixels of an image sensor. A power supply (NVDD) is operationally coupled to the TX driver. A first switch (SW1) operationally coupling an outside capacitance (Cext) and the TX driver. A second switch (SW2) operationally coupling the Cext and the NVDD. A third switch (SW3) operationally coupling the NVDD and the TX driver. A falling edge of the TX driver voltage is configured to control a start of data transfer from individual pixels of the plurality of pixels. The SW1 and the SW2 are configured in an open position before the falling edge of the TX driver voltage. The SW3 is configured in a closed position before the falling edge.
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