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Touch-sensitive screen

  • US 10,310,656 B2
  • Filed: 04/02/2012
  • Issued: 06/04/2019
  • Est. Priority Date: 04/01/2011
  • Status: Active Grant
First Claim
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1. A display device, comprising:

  • a panel layer, anda first transparent electrode layer arranged on a top side of the panel layer and a second transparent electrode layer arranged on a bottom side of the panel layer wherein substantially the entire second transparent electrode layer forms a single electrode,wherein the first transparent electrode layer is subdivided into a plurality of electrode segments that form a segment array defining segment rows and segment columns substantially covering the entire panel layer,interpretation circuitry configured to;

    receive signals from the electrode segments;

    detect a contact of an object with the display device;

    during a period of contact of the object with the display device, operating the display device in a contact detection state in which the interpretation circuitry performs a contact-based position or movement detection of the object in contact with the display device using said electrode segments,detect an interruption in the contact of the object with the display device;

    in response to detecting the interruption in contact of the object with the display device and while detecting that the object is within a predetermined distance from the panel layer, automatically switching the display device from the contact detection state to a contactless detection state in which the single electrode formed by the second transparent electrode layer receives a signal for generating an alternating electric field and the interpretation circuitry is configured to perform a contactless position or movement detection of the object in an area in front of the display device, wherein the contactless position or movement detection is performed by selecting a most upper and a most lower row-like group and a most left and a most right column-like group of the electrode segments of the segment array wherein signal levels from the most upper and the most lower row-like groups of electrode segments and the most left and the most right column-like groups of electrode segments are used to determine a three-dimensional location.

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