Patent ID: 11893188
Assignee: 1004335 ONTARIO INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 18:
19. A touch sensor system comprising:
a sensing area having a periphery;
a plurality of light sources and a plurality of analog optical detectors arranged about the periphery of the sensing area, each of the plurality of light sources being aligned with a respective one of the plurality of analog optical detectors;
addressing circuitry that selectively drives each of the plurality of light sources and selectively activates each of the plurality of analog optical detectors;
an analog databus, wherein each of the plurality of analog optical detectors have a respective output, the outputs of the plurality of analog optical detectors being collectively coupled to the analog databus, and wherein the addressing circuitry selectively and sequentially activates the analog optical detectors such that output signals from the analog optical detectors are time multiplexed on the analog databus, thereby creating a time multiplexed collective detector output; and
an impedance balancing circuit that creates a differential output signal from the time multiplexed collective detector output.