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

Claim 20:
21. A method of making a display article, comprising:
masking a substrate comprising a thickness and a primary surface with a mask;
forming a diffractive surface region within the primary surface of the substrate with the mask; and
removing the mask from the substrate,
wherein the diffractive surface region comprises a plurality of structural features that comprises a plurality of different heights in a multimodal distribution, wherein the multimodal distribution comprises a plurality of modes, with each mode being distinguished by a decrease in area fraction of at least 20% from a peak surface height value of the mode, wherein the plurality of structural features further comprises a first portion of structural features at a first average height and a second portion of structural features at a second average height, and
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.