Anti-glare substrates with low sparkle, DOI and transmission haze

Patent metadata

Field	Value
Publication number	US-11009736-B2
Application number	US-202016848254-A
Country	US
Kind code	B2
Filing date	Apr 14, 2020
Priority date	Sep 8, 2014
Publication date	May 18, 2021
Grant date	May 18, 2021

Abstract

Embodiments of anti-glare substrates and articles including the same are disclosed. In one or more embodiments, the anti-glares substrate includes a textured surface with a plurality of features having an average cross-sectional dimension of about 30 micrometers or less. The substrate or article exhibits a transmission haze of 10% or less, a PPDr of about 7% or less or 6% or less, and a DOI of about 80 or less. Method for forming the anti-glare substrates are also disclosed and include etching a surface of a substrate with an etchant having low water solubility to provide an etched surface, and removing a portion of the etched surface. The method includes generating a plurality of insoluble crystals (e.g., any one or more of K 2 SiF 6 and K 3 AlF 6 ) on the surface while etching the surface. The etchant may include a potassium salt, an organic solvent and a fluoride containing acid.

First claim

What is claimed is:

1. An article comprising:
a substrate; and
at least one textured surface comprising a plurality of features having an average cross-sectional dimension of about 30 micrometers or less,
wherein the article exhibits a transmission haze of 10% or less, a pixel power deviation referenced PPDr of about 7% or less and a distinctiveness of image DOI of about 80 or less.

2. The article of claim 1 , wherein the PPDr value is about 6% or less.

3. The article of claim 1 , wherein the features comprise a Rsk value in the range from about 1 to about −1.

4. The article of claim 1 , wherein the substrate comprises an amorphous substrate.

5. The article of claim 4 , wherein the amorphous substrate comprises a glass, and the glass is chemically strengthened and comprises a compressive stress layer with a surface compressive stress of at least 250 MPa extending within the chemically strengthened glass from a surface of the glass to a depth of layer DOL of about 10 μm or greater.

6. The article of claim 2 , wherein the features comprise concave openings that face outwardly from the textured surface.

7. The article of claim 1 , wherein the substrate comprises a crystalline substrate.

8. The article of claim 4 , wherein the amorphous substrate comprises a glass selected from the group consisting of soda lime glass, alkali aluminosilicate glass, alkali containing borosilicate glass and alkali aluminoborosilicate glass.

9. The article of claim 1 , wherein the features comprise concave openings that face outwardly from the textured surface.

10. The article of claim 4 , wherein the amorphous substrate comprises a glass, and the glass is chemically strengthened and comprises a surface compressive stress of at least 250 MPa.

11. The article of claim 4 , wherein the amorphous substrate comprises a glass, and the glass is chemically strengthened and comprises a compressive stress layer extending within the chemically strengthened glass from a surface of the glass to a depth of layer DOL of about 10 μm or greater.

Assignees

• Corning Inc

Inventors

• Bazemore Brandon Allen
• Jin Yuhui
• Hou Jun

Classifications

• C03C3/087

  containing calcium oxide, e.g. common sheet or container glass · CPC title

• G02F1/133502 Primary

  Antiglare, refractive index matching layers · CPC title

• G02B5/0221

  the surface having an irregular structure (G02B5/0226 takes precedence) · CPC title

• C03C15/00 Primary

  Surface treatment of glass, not in the form of fibres or filaments, by etching (etching or surface-brightening compositions, in general C09K13/00) · CPC title

• G02B5/0294

  adapted to provide an additional optical effect, e.g. anti-reflection or filter · CPC title