Transparent glass substrate having antiglare surface
First Claim
Patent Images
1. A transparent glass substrate having an antiglare surface, the antiglare surface comprising:
- a roughened surface, the roughened surface having a roughness and an RMS amplitude of at least about 80 nm; and
a frequency cutoff of less than about [1/(0.081·
RMS)], wherein the frequency cutoff is a frequency ν
at which the power spectral density of the roughness falls below 1/e2 and is expressed in 1/microns (μ
m−
1) and RMS is the RMS amplitude of the roughened surface, expressed in nanometers.
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Abstract
A transparent glass substrate having an antiglare surface that minimizes sparkle. The antiglare surface has a roughened portion that surface that has a RMS amplitude of at least amplitude of at least about 80 nm. The antiglare surface may also include a portion that is unroughened, or flat. The fraction of the antiglare surface that is roughened is at least about 0.9, and the fraction of the surface that is unroughened is less than about 0.10. The antiglare surface has a pixel power deviation of less than about 7%.
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Citations
21 Claims
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1. A transparent glass substrate having an antiglare surface, the antiglare surface comprising:
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a roughened surface, the roughened surface having a roughness and an RMS amplitude of at least about 80 nm; and a frequency cutoff of less than about [1/(0.081·
RMS)], wherein the frequency cutoff is a frequency ν
at which the power spectral density of the roughness falls below 1/e2 and is expressed in 1/microns (μ
m−
1) and RMS is the RMS amplitude of the roughened surface, expressed in nanometers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A display assembly, the display assembly comprising:
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a pixelated display, the pixelated display comprising a plurality of pixels having a pixel pitch; and a transparent glass substrate having an antiglare surface, wherein the transparent glass substrate is disposed in front of the pixelated display and separated from the pixelated display by an optical distance D, expressed in millimeters, wherein the antiglare surface is opposite a surface of the transparent glass substrate facing the pixelated display, wherein the antiglare surface has a roughened surface, the roughened surface having an RMS amplitude of at least about 80 nm, and wherein the roughened surface has a cutoff frequency, wherein the cutoff frequency is a frequency ν
at which the power spectral density of the roughness falls below 1/e2 and is expressed in 1/microns (μ
m−
1), of greater than [(280/P)·
(0.098·
RMS−
5.55)·
D/3], wherein each of the plurality of pixels having a pixel pitch P, expressed in microns, and RMS is the RMS amplitude of the roughened surface, expressed in nanometers. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification