Patent ID: 11940593
Assignee: CORNING INCORPORATED
Field: Optics (Instruments)
Classification: CPC G  C | IPC C  G

Claim 17:
18. A display article, comprising:
a substrate comprising a thickness and a primary surface; and
the primary surface having defined thereon a diffractive surface region,
wherein the diffractive surface region comprises a plurality of structural features comprising a pitch of less than 125 μm, a fill fraction from 30% to 70%, and
further wherein each structural feature comprises a height or depth of from 50 nm to 250 nm, wherein the diffractive surface region further comprises a first planar region disposed at a first average height and a second planar region disposed at a second average height, wherein each of the first planar region and the second planar region comprises a root-mean-square (RMS) height variatin of less than 50 nm.