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Interactive CRT with touch level set

  • US 4,710,759 A
  • Filed: 04/13/1987
  • Issued: 12/01/1987
  • Est. Priority Date: 02/22/1984
  • Status: Expired due to Term
First Claim
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1. In a touch control panel having a plurality of crossing energy paths and means for repetitively testing the energy levels in said paths against stored test levels for said paths to determine if an interruption, corresponding to a touch, has occurred, a method of updating the stored test levels for said paths comprising the steps of:

  • energizing each of said paths in sequence;

    comparing the detected energy level in each of said paths with a nominal threshold level;

    A. (1) if the test indicates energy is detected, testing again with a maximum threshold level;

    (2) if at a maximum energy level, storing the maximum threshold level as the updated test level for that energy path;

    (3) if not at a maximum energy level, increasing the nominal threshold level and testing again;

    (4) continuing testing and increasing the threshold level until no energy is detected, and storing the last threshold level as the updated test level for that path;

    B. (1) if the test indicates no energy detected, testing for a minimum threshold level;

    (2) if at a minimum threshold level, storing the minimum threshold level as the updated test level for that path;

    (3) if the threshold level is not at a minimum, decreasing the threshold level by a predetermined amount; and

    (4) storing the decreased threshold level as the updated test level for that path.

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