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Touch panel device and control method and device for eliminating noises in touch panel device

  • US 20060214921A1
  • Filed: 08/16/2005
  • Published: 09/28/2006
  • Est. Priority Date: 03/23/2005
  • Status: Active Grant
First Claim
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1. A control method for eliminating noises in a touch panel device including an excitation transducer for exciting a surface acoustic wave upon application of a burst wave and a reception transducer for receiving the surface acoustic wave and converting the same into a reception signal that are arranged at a peripheral portion of a detection area so that a position of an object touching the detection area is detected in accordance with a change in the reception signal, the control method comprising the steps of:

  • detecting a differential between a reception signal due to a burst wave and another reception signal due to another burst wave;

    deciding that there is a noise if the detected differential exceeds a preset threshold value; and

    performing a control operation so that the detection of an object based on the reception signal is not performed in accordance with the decision.

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