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

Claim 11:
12. 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 and a fill fraction from 30% to 70%, each structural feature comprising a diameter of less than 100 μm, and
further wherein the substrate exhibits a sparkle of less than 4%, as measured by pixel power deviation (PPD140) at an incident angle of 0° from normal, a distinctness of image (DOI) of less than 80% at an incident angle of 20° from normal, and a transmittance haze of less than 20% from an incident angle of 0° from normal, 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 variation of lesss than 50 nm.