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Layered coatings for sapphire substrate

  • US 9,745,662 B2
  • Filed: 03/14/2014
  • Issued: 08/29/2017
  • Est. Priority Date: 03/15/2013
  • Status: Active Grant
First Claim
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1. An electronic device, comprising:

  • a window, comprising;

    a sapphire substrate comprising a first surface and a second surface each having an array of surface defects, the second surface positioned opposite the first surface;

    a first layer adhered to the first surface and the array of surface defects on the first surface to fill the surface defects, the first layer formed of one of alumina or silicon oxynitride at a first thickness; and

    a second layer adhered to the second surface and the array of surface defects on the second surface, the second layer formed from one of alumina or silicon oxynitride at a second thickness that is less than the first thickness,wherein the second layer induces a compressive stress within the sapphire substrate.

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