Patents by Inventor John Brummer

John Brummer 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).

  • Image sensor with capacitor randomization for column gain
    Patent number: 11240458
    Abstract: A pixel cell readout circuit includes a bitline input stage coupled to a bitline to receive an image signal from a pixel cell. A capacitor ratio circuit is coupled to the bitline input stage. A gain of the bitline input stage is responsive to a capacitor ratio provided by the capacitor ratio circuit to the bitline input stage. A switch control circuit is coupled to receive a gain signal. The switch control circuit is coupled to generate a randomized pattern selection signal coupled to be received by the capacitor ratio circuit to select the capacitor ratio provided by the capacitor ratio circuit in response to the gain signal.
    Type: Grant
    Filed: June 12, 2020
    Date of Patent: February 1, 2022
    Assignee: OMNIVISION TECHNOLOGIES, INC.
    Inventors: Hiroaki Ebihara, Rui Wang, John Brummer, Shan Chen
  • IMAGE SENSOR WITH CAPACITOR RANDOMIZATION FOR COLUMN GAIN
    Publication number: 20210392286
    Abstract: A pixel cell readout circuit includes a bitline input stage coupled to a bitline to receive an image signal from a pixel cell. A capacitor ratio circuit is coupled to the bitline input stage. A gain of the bitline input stage is responsive to a capacitor ratio provided by the capacitor ratio circuit to the bitline input stage. A switch control circuit is coupled to receive a gain signal. The switch control circuit is coupled to generate a randomized pattern selection signal coupled to be received by the capacitor ratio circuit to select the capacitor ratio provided by the capacitor ratio circuit in response to the gain signal.
    Type: Application
    Filed: June 12, 2020
    Publication date: December 16, 2021
    Inventors: Hiroaki Ebihara, Rui Wang, John Brummer, Shan Chen
  • Low current drive of light emitting devices
    Patent number: 6191534
    Abstract: Control circuitry for an array of light emitting devices includes a first column line connected to each light emitting device in a column of light emitting devices. First column circuitry includes a first current source and a second current source. The first current source is connected to the first column line. The second current source is connected to the first column line. When a first light emitting device from the column of light emitting devices is to be turned on, the first current source is turned on until a voltage on the first column line is equal to a predetermined voltage. Then the first current source is turned off and the second current source supplies current sufficient to cause the first light emitting device to emit light to a first brightness level.
    Type: Grant
    Filed: July 21, 1999
    Date of Patent: February 20, 2001
    Assignee: Infineon Technologies North America Corp.
    Inventors: Jeffrey A. Schuler, Yang Zhao, John Brummer