Glass having antiglare surface with low display sparkle
First Claim
Patent Images
1. A transparent glass sheet, the transparent glass sheet having at least one antiglare surface, wherein the antiglare surface has:
- a first RMS surface roughness Rlong of up to about 300 nm measured in a range of lateral spatial periods from about 40 μ
m to about 640 μ
m;
a second RMS surface roughness Rshort measured at lateral spatial periods of less than about 20 μ
m, wherein the ratio (Rlong/Rshort) is less than about 3.9; and
a third RMS roughness Rtotal, measured without surface wavelength filtering, wherein the third RMS roughness Rtotal is in a range from about 60 nm to about 600 nm, and wherein the transparent glass sheet has a pixel power deviation of less than about 7.5% when disposed in front of a pixelated display having a plurality of pixels and an imaging plane such that the antiglare surface is distal from the pixelated display and separated from the imaging plane by a predetermined distance, and wherein the transparent glass sheet has a 20°
distinctness of image of less than about 60.
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Abstract
A glass article having a low level of grainy appearance that can appear to have a shift in the pattern of the grains with changing viewing angle of a display, or “sparkle.” The glass article—which, in some embodiments, is a transparent glass sheet—has small-angle-scattering properties and/or distinctness-of-reflected-image (DOI), leading to improved viewability in display applications, especially under high ambient lighting conditions. In some embodiments, the antiglare surface of the glass sheet is an etched surface, with no foreign coating present on the antiglare surface.
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Citations
44 Claims
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1. A transparent glass sheet, the transparent glass sheet having at least one antiglare surface, wherein the antiglare surface has:
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a first RMS surface roughness Rlong of up to about 300 nm measured in a range of lateral spatial periods from about 40 μ
m to about 640 μ
m;a second RMS surface roughness Rshort measured at lateral spatial periods of less than about 20 μ
m, wherein the ratio (Rlong/Rshort) is less than about 3.9; anda third RMS roughness Rtotal, measured without surface wavelength filtering, wherein the third RMS roughness Rtotal is in a range from about 60 nm to about 600 nm, and wherein the transparent glass sheet has a pixel power deviation of less than about 7.5% when disposed in front of a pixelated display having a plurality of pixels and an imaging plane such that the antiglare surface is distal from the pixelated display and separated from the imaging plane by a predetermined distance, and wherein the transparent glass sheet has a 20°
distinctness of image of less than about 60. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A display system, the display system comprising:
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a pixelated display having a plurality of pixels and an imaging plane; and a transparent glass sheet having an antiglare surface, wherein the transparent glass sheet is disposed in front of the pixelated display such that the antiglare surface is distal from the pixelated display and separated from the imaging plane by an optical distance, wherein the transparent glass sheet has a pixel power deviation of less than about 7.5%, wherein the transparent glass sheet has a 20°
distinctness of image of less than about 60, and wherein the antiglare surface has a first RMS surface roughness Rlong of up to about 300 nm measured in a range of lateral spatial periods from about 40 μ
m to about 640 μ
m;a second RMS surface roughness Rshort measured at lateral spatial periods of less than about 20 μ
m, wherein the ratio (Rlong/Rshort) is less than about 3.9; anda third RMS roughness Rtotal, measured without surface wavelength filtering, wherein the third RMS roughness Rtotal is in a range from about 60 nm to about 600 nm. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method of making a transparent glass sheet having at least one antiglare surface, the method comprising roughening at least one surface of the transparent glass sheet to form the at least one antiglare surface, wherein the at least one antiglare surface has a first RMS surface height roughness Rlong of up to about 300 nm, a second RMS surface roughness Rshort measured at lateral spatial periods of less than about 20 μ
- m, and a third RMS roughness Rtotal measured without surface wavelength filtering, wherein the ratio (Rlong/Rshort) is less than about 3.9, and wherein Rtotal is in a range from about 60 nm up to about 600 nm, and wherein the transparent glass sheet has a pixel power deviation of less than about 7.5% when disposed in front of a pixelated display having a plurality of pixels and an imaging plane such that the antiglare surface is distal from the pixelated display and separated from the imaging plane by a predetermined distance, and wherein the transparent glass sheet has a 20°
distinctness of image of less than about 60. - View Dependent Claims (33, 34, 35, 36, 37, 38, 39, 40, 41)
- m, and a third RMS roughness Rtotal measured without surface wavelength filtering, wherein the ratio (Rlong/Rshort) is less than about 3.9, and wherein Rtotal is in a range from about 60 nm up to about 600 nm, and wherein the transparent glass sheet has a pixel power deviation of less than about 7.5% when disposed in front of a pixelated display having a plurality of pixels and an imaging plane such that the antiglare surface is distal from the pixelated display and separated from the imaging plane by a predetermined distance, and wherein the transparent glass sheet has a 20°
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42. A transparent glass sheet, the transparent glass sheet having at least one antiglare surface, wherein the antiglare surface has:
- a first RMS surface roughness Rlong nm measured in a range of lateral spatial periods from about 80 μ
m to about 640 μ
m; and
a second RMS roughness Rtotal, measured without surface wavelength filtering, wherein the ratio Rtotal/Rlong is greater than or equal to about 2.20, and wherein the transparent glass sheet has a pixel power deviation of less than about 7.5% when disposed in front of a pixelated display having a plurality of pixels and an imaging plane such that the antiglare surface is distal from the pixelated display and separated from the imaging plane by a predetermined distance, and wherein the transparent glass sheet has a 20°
distinctness of image of less than about 60. - View Dependent Claims (43, 44)
- a first RMS surface roughness Rlong nm measured in a range of lateral spatial periods from about 80 μ
Specification