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Touch panel input apparatus performing a sampling operation intermittently

  • US 5,777,604 A
  • Filed: 06/06/1995
  • Issued: 07/07/1998
  • Est. Priority Date: 10/31/1994
  • Status: Expired due to Term
First Claim
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1. A touch panel input apparatus comprising:

  • a touch panel including two electrode panels one of which has a resistance distribution uniform in an X-direction and the other of which has a resistance distribution uniform in a Y-direction;

    a touch panel control circuit for, in a power-off state of the apparatus, applying a first voltage to one end of one of the two electrode panels, and at the same time, applying a second voltage to one end of the other electrode panel via an output resistance, and sampling a voltage which is developed between both terminals of the output resistance when the two electrode panels have been brought into contact with each other; and

    wherein the touch panel control circuit includes;

    electrode panel control means for, in the power-off state of the apparatus, intermittently applying the first voltage to the one end of the one electrode panel synchronously with a clock signal, and at the same time, intermittently applying the second voltage to the one end of the other electrode panel via the output resistance; and

    sampling means for, in the power-off state of the apparatus, performing the sampling of the voltage synchronously with the clock signal and outputting a signal indicating whether or not the sampled voltage is equal to or higher than a predetermined level, wherein when the signal indicates that the sampled voltage is equal to or higher than the predetermined level, the signal is a power-on instruction signal.

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