The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 24, 2019
Filed:
Apr. 15, 2018
Invisage Technologies, Inc., Newark, CA (US);
Nikolai E. Bock, San Jose, CA (US);
INVISAGE TECHNOLOGIES, INC., Newark, CA (US);
Abstract
Imaging apparatus includes a photosensitive medium, which is configured to convert incident photons into charge carriers. An array of three-transistor (3T) pixel circuits, coupled to the photosensitive medium, is arranged in rows and columns on a semiconductor substrate and collects the charge carriers from the photosensitive medium. A readout circuitry includes a plurality of column readout lines; each column readout line is coupled to respective outputs of the pixel circuits in a corresponding column of the array and includes a current source load coupled between a constant-voltage supply and the outputs of the pixel circuits, and a bypass switch in parallel with the current source load. Control circuitry alternately opens the bypass switch on each column readout line during a signal readout phase and closes the bypass switch during a pixel reset phase.