WATER-IMMUNE FTIR TOUCH SCREEN
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United States of America Patent
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Issued Date -
Nov 5, 2015
app pub date -
Apr 30, 2014
filing date -
Apr 30, 2014
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Abstract
Disclosed herein are systems and methods for a water-immune FTIR touchscreen. An optically clear adhesive with an index of refraction between that of water and human skin in the infrared wavelength range is placed below a touchscreen interface substrate. Light beams with a glancing angle greater than a critical glancing angle determined by the index of refraction of the optically clear adhesive do not totally internally reflect at the interface of the touchscreen interface substrate and the optically clear adhesive. Light beams with a glancing angle below the critical glancing angle totally internally reflect. A glancing angle that totally internally reflects at the substrate/optically clear adhesive interface will also totally internally reflect at an interface of the substrate and any water on the surface of the substrate, rendering the touchscreen immune to the effects of water.
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