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Touch sensitive displays with layers of sensor plates providing capacitance based proximity sensing and related touch panels

  • US 8,669,944 B2
  • Filed: 12/15/2008
  • Issued: 03/11/2014
  • Est. Priority Date: 12/15/2008
  • Status: Expired due to Fees
First Claim
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1. An electronic touch panel comprising:

  • a plurality of spaced apart first sensor plates arranged in a first direction on a first planar layer;

    a plurality of second sensor plates arranged in a second direction on a second planar layer;

    a proximity sensor plate that is spaced apart from and attached to the first planar layer, wherein the proximity sensor plate has a greater surface area than the plurality of the first sensor plates and the plurality of the second sensor plates, wherein the proximity sensor plate comprises a metallic reflector layer, and wherein the metallic reflector layer extends beneath at least a majority of the first and second sensor plates; and

    a position detection circuit that is configured to electrically charge the first sensor plates to generate capacitive coupling to an adjacent user object and detect therefrom a location of the user object relative to the first direction across the first planar layer, and configured to electrically charge the proximity sensor plate to generate a higher level of capacitive coupling to the user object than a plurality of the first sensor plates and to detect therefrom a proximity of the user object relative to a direction away from the first planar layer.

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