CPC G02B 1/14 (2015.01) [G02B 1/115 (2013.01); G02B 5/285 (2013.01); C03C 2217/734 (2013.01)] | 28 Claims |
1. An article, comprising:
a glass-ceramic substrate comprising a first primary surface and a second primary surface, the first primary surface and the second primary surface opposing one another; and
an optical film structure defining an outer surface, the optical film structure disposed on the first primary surface,
wherein the glass-ceramic substrate comprises an elastic modulus of greater than 85 GPa and a fracture toughness of greater than 0.8 MPa·√m,
wherein:
the article exhibits a maximum hardness of greater than 10 GPa, as measured by a Berkovich Hardness Test over an indentation depth range from about 100 nm to about 500 nm from the outer surface of the optical film structure,
the article exhibits an average photopic transmittance of greater than 80%,
the article exhibits a transmitted color √(a*2+b*2) with a D65 illuminant of less than 4 at incident angles from 0 degrees to 10 degrees.
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