Textured surfaces for display applications

Patent metadata

Field	Value
Publication number	US-10698151-B2
Application number	US-201916385740-A
Country	US
Kind code	B2
Filing date	Apr 16, 2019
Priority date	Dec 19, 2013
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

A substrate with a textured surface is disclosed. The substrate may be, for example, a light emitter comprising a light guide, for example a backlight element for use in a display device, wherein a surface of the light guide, for example a glass substrate, is configured to have a textured surface with a predetermined RMS roughness and a predetermined correlation length of the texture. A plurality of light scatter suppressing features can be provided on the textured surface. Textured surfaces disclosed herein may be effective to reduce electrostatic charging of the substrate surface. Methods of producing the textured surface are also disclosed.

First claim

What is claimed is:

1. A substrate comprising at least one textured major surface comprising a figure of merit FOM in a range from greater than zero to about 0.78, wherein FOM is calculated as

FOM
=

CA
·

δ
m

N

×

∑

i
=
1

N

⁢

1

Δ
i
m

⁢

⁢
and

Δ
i

=

{

h
t

-

h
i

+
δ

h
i

≤

h
t

h
t

+
δ

h
i

>

h
t

,

where δ represents a minimum distance between a contacted area of the textured major surface with a contact plane for which 0.1≤δ≤10 nm, Δ represents the extent of separation from the contact plane, CA is the contact area given by the number of pixels for which h i ≥h t , h i represents the surface height data for N surface height elements, h t represents a threshold height defining the contribution of uppermost heights on the textured surface that come into contact with the contact plane for which 0.5≤h t ≤0.999, and m weights the importance of separation distance for pixels not contacting the contact plane for which m is a whole number in a range from 2 to 6.

2. The substrate according to claim 1 , wherein the substrate comprises a transmittance equal to or greater than 94%.

3. The substrate according to claim 1 , wherein the substrate comprises a haze equal to or less than 6%.

4. The substrate according to claim 3 , wherein the haze is equal to or less than 1%.

5. The substrate according to claim 1 , wherein an average roughness R a of the textured surface is 0.4≤R a ≤10 nm.

6. The substrate according to claim 1 , wherein a correlation length T of the surface texture is equal to or less than 150 nm.

7. The substrate according to claim 6 , wherein an RMS roughness R q of the textured surface is 5 nm≤R q ≤75 nm.

8. The substrate according to claim 1 , wherein the substrate is a glass substrate.

9. The substrate according to claim 1 , wherein m is 2.

10. The substrate according to claim 1 , wherein m is 6.

11. The substrate according to claim 1 , wherein 0.1≤δ≤2 nm.

12. The substrate according to claim 11 , wherein 0.5≤δ≤2 nm.

13. The substrate according to claim 1 , wherein 0.75≤h t ≤0.99.

14. The substrate according to claim 1 , wherein 0.7≤h t ≤0.9.

15. The substrate according to claim 1 , wherein the FOM is in a range from 0.22 to 0.77.

16. The substrate according to claim 15 , wherein the FOM is in a range from 0.61 to 0.77.

17. The substrate according to claim 1 , wherein the substrate comprises a transmittance in a range from greater than 94% to 100%.

Assignees

• Corning Inc

Inventors

• Hamilton James Patrick
• Koch Iii Karl William
• Li Aize
• Mis Jonathan Michael
• Ravichandran Vasudha
• Smith Nicholas James
• Wolcott Christine Coulter
• Yongsunthon Ruchirej

Classifications

• C03C15/00

  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

• G02B5/0221 Primary

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

• G02B6/0036 Primary

  2-D arrangement of prisms, protrusions, indentations or roughened surfaces · CPC title

• G02B5/0294

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

• G02B1/111

  using layers comprising organic materials · CPC title