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Electromagnetic-type touch panel, method for driving and detecting electromagnetic-type touch panel, and coordinate input device

  • US 9,576,548 B2
  • Filed: 01/21/2015
  • Issued: 02/21/2017
  • Est. Priority Date: 07/22/2014
  • Status: Active Grant
First Claim
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1. An electromagnetic-type touch panel, configured to detect a touch position of an electromagnetic stylus, the electromagnetic stylus comprising:

  • a first resonance circuit and a second resonance circuit; and

    the electromagnetic-type touch panel comprising;

    a plurality of first coils extending in a first direction and a plurality of second coils extending in a second direction,wherein each of the plurality of first coils is configured to emit a first electromagnetic signal having a first frequency,wherein each of the plurality of second coils is configured to emit a second electromagnetic signal having a second frequency different from the first frequency,wherein the first resonance circuit of the electromagnetic stylus is configured to receive the first electromagnetic signal and reflect a first reflected signal having the first frequency,wherein the second resonance circuit of the electromagnetic stylus is configured to receive the second electromagnetic signal and reflect a second reflected signal having the second frequency, andwherein the plurality of first coils are configured to receive the second reflected signal, and the plurality of second coils are configured to receive the first reflected signal.

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