Patents by Inventor Chengcheng Xu

Chengcheng Xu has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 12294796
    Abstract: An imaging device includes a pixel array with 2×2 pixel circuits arranged in rows and columns. Each 2×2 pixel circuit includes 4 photodiodes. Bitlines are coupled to the 2×2 pixel circuits and a color filter array is disposed over photodiodes of the pixel array. The color filter array includes color filters having a first color, color filters having a second color, color filters having a third color. The photodiodes of each 2×2 pixel circuits are covered by one of the color filters. Photodiodes covered by color filters having the first color and photodiodes covered by color filters having the second color are configured to provide non-phase detection (non-PD) information. Photodiodes covered by color filters having the third color are configured to provide phase detection (PD) information. Half of the 2×2 pixel circuits have the photodiodes covered by color filters having the third color.
    Type: Grant
    Filed: April 3, 2023
    Date of Patent: May 6, 2025
    Assignee: OMNIVISION TECHNOLOGIES, INC.
    Inventors: Rui Wang, Chengcheng Xu, Lihang Fan, Eiichi Funatsu
  • Publication number: 20250047695
    Abstract: Network traffic (e.g., as monitored by a security appliance on a local network) associated with a session is parsed to determine, using a prefilter, that a suspicious portion of that traffic should be forwarded to a remote service. The remote service is configured with a plurality of realtime detectors. A verdict is received from the remote service. In the event the verdict indicates that the session is malicious, a remedial action is taken in response.
    Type: Application
    Filed: August 1, 2023
    Publication date: February 6, 2025
    Inventors: Chengcheng Xu, Mengying Jiang, Shengming Xu
  • Patent number: 12199632
    Abstract: A tail current source of a comparator includes a first transistor and a second transistor configured to operate as current sources, wherein the first and second transistors are coupled between a tail node of the comparator and a voltage node, and wherein the tail comprises a node coupled to first and second inputs of the comparator. The tail current source also includes a switch configured to selectively couple the second transistor between the tail and the voltage node, and a bias voltage source coupled to gates of the first and second transistors. The switch is configured to be on during an analog-to-digital conversion (ADC) reset signal period and an ADC image signal period, and the switch is configured to be off during an auto-zero period, a period between the ADC reset signal and image signal periods, and a period after the ADC image signal period.
    Type: Grant
    Filed: February 28, 2023
    Date of Patent: January 14, 2025
    Assignee: OMNIVISION TECHNOLOGIES, INC.
    Inventors: Hiroaki Ebihara, Chengcheng Xu, Satoshi Sakurai, Kenny Geng
  • Publication number: 20240334085
    Abstract: An imaging device includes a pixel array with 2×2 pixel circuits arranged in rows and columns. Each 2×2 pixel circuit includes 4 photodiodes. Bitlines are coupled to the 2×2 pixel circuits and a color filter array is disposed over photodiodes of the pixel array. The color filter array includes color filters having a first color, color filters having a second color, color filters having a third color. The photodiodes of each 2×2 pixel circuits are covered by one of the color filters. Photodiodes covered by color filters having the first color and photodiodes covered by color filters having the second color are configured to provide non-phase detection (non-PD) information. Photodiodes covered by color filters having the third color are configured to provide phase detection (PD) information. Half of the 2×2 pixel circuits have the photodiodes covered by color filters having the third color.
    Type: Application
    Filed: April 3, 2023
    Publication date: October 3, 2024
    Inventors: Rui Wang, Chengcheng Xu, Lihang Fan, Eiichi Funatsu
  • Publication number: 20240291499
    Abstract: A tail current source of a comparator includes a first transistor and a second transistor configured to operate as current sources, wherein the first and second transistors are coupled between a tail node of the comparator and a voltage node, and wherein the tail comprises a node coupled to first and second inputs of the comparator. The tail current source also includes a switch configured to selectively couple the second transistor between the tail and the voltage node, and a bias voltage source coupled to gates of the first and second transistors. The switch is configured to be on during an analog-to-digital conversion (ADC) reset signal period and an ADC image signal period, and the switch is configured to be off during an auto-zero period, a period between the ADC reset signal and image signal periods, and a period after the ADC image signal period.
    Type: Application
    Filed: February 28, 2023
    Publication date: August 29, 2024
    Inventors: Hiroaki Ebihara, Chengcheng Xu, Satoshi Sakurai, Kenny Geng
  • Patent number: 12054100
    Abstract: The present invention provides an in-vehicle display device, an in-vehicle display system, and a vehicle. The in-vehicle display device includes a display panel and an optical module. In a top view of the in-vehicle display device, a distance between the optical module and a left edge of the display panel or a distance between the optical module and a right edge of the display panel is from a 2 - L ? tan ? ( ? 2 ) + L ? 2 to a 2 + L ? tan ? ( ? 2 ) - L ? 2 , a distance between the optical module and an upper edge of the display panel is from 0 to b 2 + L ? tan ? ( ? 2 ) - L ?? 2 cos ? ? , and a distance between the optical module and a lower edge of the display panel is from b 2 - L ? tan ? ( ? 2 ) - L ?? 2 cos ? ? to b.
    Type: Grant
    Filed: November 26, 2021
    Date of Patent: August 6, 2024
    Assignee: WUHAN CHINA STAR OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Chengcheng Xu, Qiang He
  • Patent number: 11991199
    Abstract: An anomaly detection model is trained to detect malicious traffic sessions with a low rate of false positives. A sample feature extractor extracts tokens corresponding to human-readable substrings of incoming unstructured payloads in a traffic session. The tokens are correlated with a list of malicious traffic features and frequent malicious traffic features across the traffic session are aggregated into a feature vector of malicious traffic feature frequencies. An anomaly detection model trained on feature vectors for unstructured malicious traffic samples predicts the traffic session as malicious or unclassified. The anomaly detection model is trained and updated based on its' ongoing false positive rate and malicious traffic features in the list of malicious traffic features that result in a high false positive rate are removed.
    Type: Grant
    Filed: January 27, 2023
    Date of Patent: May 21, 2024
    Assignee: Palo Alto Networks, Inc.
    Inventors: Stefan Achleitner, Chengcheng Xu
  • Publication number: 20240140312
    Abstract: The present invention provides an in-vehicle display device, an in-vehicle display system, and a vehicle. The in-vehicle display device includes a display panel and an optical module. In a top view of the in-vehicle display device, a distance between the optical module and a left edge of the display panel or a distance between the optical module and a right edge of the display panel is from a 2 - L ? tan ? ( ? 2 ) + L ? 2 ? to ? a 2 + L ? tan ? ( ? 2 ) - L ? 2 , a distance between the optical module and an upper edge of the display panel is from 0 to b 2 + L ? tan ? ( ? 2 ) - L '' 2 cos ? ? , and a distance between the optical module and a lower edge of the display panel is from b 2 - L ? tan ? ( ? 2 ) - L '' 2 cos ? ? to b.
    Type: Application
    Filed: November 26, 2021
    Publication date: May 2, 2024
    Inventors: Chengcheng XU, Qiang HE
  • Publication number: 20230421922
    Abstract: Pixel designs with reduced LOFIC reset and settling times are disclosed herein. In one embodiment, a pixel cell includes a photosensor configured to photogenerate image charge in response to incident light, a floating diffusion to receive the image charge from the photosensor, a transfer transistor coupled between the floating diffusion and the photosensor to transfer the image charge to the floating diffusion, and a first reset transistor coupled between the floating diffusion and the voltage supply. The pixel cell further includes a capacitor having two ends, and a second reset transistor. A first end of the capacitor is coupled to the floating diffusion. The second reset transistor is coupled between a second end of the capacitor and the voltage supply.
    Type: Application
    Filed: June 24, 2022
    Publication date: December 28, 2023
    Inventors: Zhe Gao, Chengcheng Xu, Dennis Tunglin Lee, Tiejun Dai
  • Patent number: 11706543
    Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.
    Type: Grant
    Filed: November 19, 2021
    Date of Patent: July 18, 2023
    Assignee: OmniVision Technologies, Inc.
    Inventors: Chengcheng Xu, Rui Wang, Bi Yuan, Liang Zuo
  • Patent number: 11683607
    Abstract: An imaging device includes a plurality of photodiodes arranged in a photodiode array to generate charge in response to incident light. The plurality of photodiodes includes first and second photodiodes. A shared floating diffusion receives charge transferred from the first and second photodiodes. An analog to digital converter (ADC) performs a first ADC conversion to generate a reference readout in response to charge in the shared floating diffusion after a reset operation. The ADC is next performs a second ADC conversion to generate a first half of a phase detection autofocus (PDAF) readout in response to charge transferred from the first photodiode to the shared floating diffusion. The ADC then performs a third ADC conversion to generate a full image readout in response to charge transferred from the second photodiode combined with the charge transferred previously from the first photodiode in the shared floating diffusion.
    Type: Grant
    Filed: June 8, 2021
    Date of Patent: June 20, 2023
    Assignee: OmniVision Technologies, Inc.
    Inventors: Chengcheng Xu, Rui Wang, Wei Deng, Chun-Sheng Yang, Xueqing Wang
  • Publication number: 20230179618
    Abstract: An anomaly detection model is trained to detect malicious traffic sessions with a low rate of false positives. A sample feature extractor extracts tokens corresponding to human-readable substrings of incoming unstructured payloads in a traffic session. The tokens are correlated with a list of malicious traffic features and frequent malicious traffic features across the traffic session are aggregated into a feature vector of malicious traffic feature frequencies. An anomaly detection model trained on feature vectors for unstructured malicious traffic samples predicts the traffic session as malicious or unclassified. The anomaly detection model is trained and updated based on its' ongoing false positive rate and malicious traffic features in the list of malicious traffic features that result in a high false positive rate are removed.
    Type: Application
    Filed: January 27, 2023
    Publication date: June 8, 2023
    Inventors: Stefan Achleitner, Chengcheng Xu
  • Patent number: 11630180
    Abstract: A technique for polar aligning the mount of a telescope or other astronomical instrument includes acquiring star images from an electronic polar scope and determining a location of a celestial pole relative to the star images based on computerized matching of the star images to information in a database. The mount has a right-ascension (RA) axis, and the technique directs an adjustment to the mount so as to align a location of the RA axis with the determined location of the celestial pole.
    Type: Grant
    Filed: October 11, 2019
    Date of Patent: April 18, 2023
    Assignee: Nanjing iOptron Scientific, Inc. Ltd.
    Inventors: Chengcheng Xu, Baitao Zhao, Hua Jiang
  • Patent number: 11616798
    Abstract: An anomaly detection model is trained to detect malicious traffic sessions with a low rate of false positives. A sample feature extractor extracts tokens corresponding to human-readable substrings of incoming unstructured payloads in a traffic session. The tokens are correlated with a list of malicious traffic features and frequent malicious traffic features across the traffic session are aggregated into a feature vector of malicious traffic feature frequencies. An anomaly detection model trained on feature vectors for unstructured malicious traffic samples predicts the traffic session as malicious or unclassified. The anomaly detection model is trained and updated based on its' ongoing false positive rate and malicious traffic features in the list of malicious traffic features that result in a high false positive rate are removed.
    Type: Grant
    Filed: August 21, 2020
    Date of Patent: March 28, 2023
    Assignee: Palo Alto Networks, Inc.
    Inventors: Stefan Achleitner, Chengcheng Xu
  • Publication number: 20220394201
    Abstract: An imaging device includes a plurality of photodiodes arranged in a photodiode array to generate charge in response to incident light. The plurality of photodiodes includes first and second photodiodes. A shared floating diffusion receives charge transferred from the first and second photodiodes. An analog to digital converter (ADC) performs a first ADC conversion to generate a reference readout in response to charge in the shared floating diffusion after a reset operation. The ADC is next performs a second ADC conversion to generate a first half of a phase detection autofocus (PDAF) readout in response to charge transferred from the first photodiode to the shared floating diffusion. The ADC then performs a third ADC conversion to generate a full image readout in response to charge transferred from the second photodiode combined with the charge transferred previously from the first photodiode in the shared floating diffusion.
    Type: Application
    Filed: June 8, 2021
    Publication date: December 8, 2022
    Inventors: Chengcheng Xu, Rui Wang, Wei Deng, Chun-Sheng Yang, Xueqing Wang
  • Patent number: 11463648
    Abstract: An imaging device includes a photodiode array with a first and second photodiodes. First and second floating diffusions are configured to receive charge from the first and second photodiodes, respectively. An analog to digital converter (ADC) is configured to receive simultaneously first and second bitline signals from the first and second floating diffusions, respectively. The ADC is configured to generate a reference readout in response to the first and second bitline signals after a reset operation. The ADC next generates a first half of a phase detection autofocus (PDAF) readout in response to the first and second bitline signals after charge is transferred from the first PDAF photodiode to the first floating diffusion. The ADC then generates a full image readout in response to the first and second bitline signals after charge is transferred from the second photodiode to the second floating diffusion.
    Type: Grant
    Filed: June 8, 2021
    Date of Patent: October 4, 2022
    Assignee: OmniVision Technologies, Inc.
    Inventors: Chengcheng Xu, Rui Wang, Wei Deng, Chun-Sheng Yang, Xueqing Wang
  • Patent number: 11381771
    Abstract: A comparator includes a first stage including a first output to generate a first output signal that transitions between an upper and lower voltage level in response to a comparison of first and second inputs of the first stage. A second stage includes an input coupled to receive the first output signal from the first output of the first stage, and a second output configured to generate a second output signal in response to the first output signal. A clamp circuit includes a first node and a second node. The first node is coupled to the first output of the first stage and the second node is coupled to a supply voltage. The clamp circuit is configured to clamp a voltage difference between the first node and the second node to clamp a voltage swing of the first output signal.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: July 5, 2022
    Assignee: OmniVision Technologies, Inc.
    Inventors: Hiroaki Ebihara, Chengcheng Xu
  • Publication number: 20220201231
    Abstract: A comparator includes a first stage including a first output to generate a first output signal that transitions between an upper and lower voltage level in response to a comparison of first and second inputs of the first stage. A second stage includes an input coupled to receive the first output signal from the first output of the first stage, and a second output configured to generate a second output signal in response to the first output signal. A clamp circuit includes a first node and a second node. The first node is coupled to the first output of the first stage and the second node is coupled to a supply voltage. The clamp circuit is configured to clamp a voltage difference between the first node and the second node to clamp a voltage swing of the first output signal.
    Type: Application
    Filed: December 18, 2020
    Publication date: June 23, 2022
    Inventors: Hiroaki Ebihara, Chengcheng Xu
  • Publication number: 20220078365
    Abstract: An image sensing device includes an image sensing circuit, a voltage supply grid, bitlines, and a control circuit. The image sensing circuit includes pixels arranged in rows and columns. Each one of the bitlines is coupled to a corresponding one of the columns. The voltage supply grid is coupled to the pixels. The control circuit is coupled to output at least a row select signal and a transfer signal to the rows. Each one of the rows is selectively coupled to the bitlines to selectively output image data signals in response to the row select signal and the transfer signal. Each one of the rows is further selectively coupled to the bitlines to selectively clamp the bitlines in response to the row select signal and the transfer signal. Each one of the rows is selectively decoupled from the bitlines in response to the row select signal.
    Type: Application
    Filed: November 19, 2021
    Publication date: March 10, 2022
    Inventors: Chengcheng Xu, Rui Wang, Bi Yuan, Liang Zuo
  • Publication number: 20220060491
    Abstract: An anomaly detection model is trained to detect malicious traffic sessions with a low rate of false positives. A sample feature extractor extracts tokens corresponding to human-readable substrings of incoming unstructured payloads in a traffic session. The tokens are correlated with a list of malicious traffic features and frequent malicious traffic features across the traffic session are aggregated into a feature vector of malicious traffic feature frequencies. An anomaly detection model trained on feature vectors for unstructured malicious traffic samples predicts the traffic session as malicious or unclassified. The anomaly detection model is trained and updated based on its' ongoing false positive rate and malicious traffic features in the list of malicious traffic features that result in a high false positive rate are removed.
    Type: Application
    Filed: August 21, 2020
    Publication date: February 24, 2022
    Inventors: Stefan Achleitner, Chengcheng Xu