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Touch motion detection method, circuit, and system

  • US 9,235,289 B2
  • Filed: 07/30/2012
  • Issued: 01/12/2016
  • Est. Priority Date: 07/30/2012
  • Status: Active Grant
First Claim
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1. A touch controller, comprising:

  • a touch frame processing component adapted to receive sensor signals indicating a touch point on a touch screen, the touch frame processing component operable to process the sensor signals to generate touch information associated with each touch point, the touch information including a location of the touch point and one of a touch-in, touch-out, and touch-motion type of event associated with the touch point;

    a touch coordinate processing component coupled to the touch frame processing component, the touch coordinate processing component operable toreceive the touch information from the touch frame processing component; and

    determine whether to report the touch information for touch-motion events associated with a current touch point bydetermining a difference between the location of the current touch point and the location of a previously detected touch point,assigning to each touch-motion event a motion status that includes either a stationary state or an in-motion state,reporting the touch information associated with the current touch point when the difference is greater than a motion tolerance threshold, andselectively outputting a touch information signal based on the corresponding motion status when the difference is less than the motion tolerance threshold,anda FIFO buffer circuit that stores touch information and provides the touch information to applications external to the touch controller on a first-in-first-out basis upon detection of a touch-out event or a touch-in event and in the absence of a touch-motion event.

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