Optical touch sensor devices and systems

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 sour...

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Bibliographic Details
Main Authors Robert Donald Mcculloch, Guy Michael Amyon Farquharson Duxbury, Gueorgui Pavlov, Albert M. David
Format Patent
LanguageEnglish
Published 15.11.2023
Subjects
BASIC ELECTRONIC CIRCUITRY
CALCULATING
COLORIMETRY
COMPUTING
COUNTING
ELECTRIC DIGITAL DATA PROCESSING
ELECTRICITY
MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT
MEASURING
PHYSICS
PULSE TECHNIQUE
RADIATION PYROMETRY
TESTING
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Summary: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.
Bibliography:Application Number: GB20200019564