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Wireless display systems, styli, and associated methods

  • US 6,717,073 B2
  • Filed: 12/29/2000
  • Issued: 04/06/2004
  • Est. Priority Date: 12/29/2000
  • Status: Expired due to Term
First Claim
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1. A method of operating an ultrasonic coordinate input system comprising:

  • transmitting a burst of ultrasonic energy from an ultrasonic transmitter in a projection plane;

    receiving the burst of ultrasonic energy at a receiver an unknown distance away from the ultrasonic transmitter in the projection plane;

    determining the unknown distance from a propagation time of the ultrasonic energy;

    receiving at the receiver a higher frequency burst signal from a stylus;

    receiving at the receiver ultrasonic signals from the stylus;

    receiving at an additional receiver in the projection plane ultrasonic signals from the stylus;

    triangulating the position of the stylus relative to the projection plane; and

    when the ultrasonic signals from the stylus are at a first frequency, triangulating in two dimensions; and

    when the ultrasonic signals from the stylus are at a second frequency, triangulating in three dimensions.

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