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:
Feb. 06, 2024
Filed:
May. 16, 2019
1004335 Ontario Inc., Ottawa, CA;
Guy Michael Amyon Farquharson Duxbury, Ottawa, CA;
Robert Donald McCulloch, Ottawa, CA;
Albert M. David, Manotick, CA;
Gueorgui Pavlov, Ottawa, CA;
1004335 ONTARIO INC., Ottawa, CA;
Abstract
A touch sensor system includes a sensing area having a periphery and a plurality of light sources and a plurality of analog optical detectors arranged about the periphery of the sensing area. The system further includes addressing circuitry that selectively drives each of the plurality of light sources with a modulated signal and selectively activates the plurality of analog optical detectors, and a controller that receives a collective detector output from the plurality of analog optical detectors. The outputs from the analog optical detectors may be a time multiplexed to provide the collective detector output. Each optical detector may include a photodiode; a first transistor coupled to the photodiode in a current amplifier configuration that generates an amplified current output as a function of a photodiode current; and enable circuitry to enable and disable the optical detector as a function of an enable input signal.