US 12,140,732 B2
Anti-reflective coatings and articles and methods of forming the same
Karl William Koch, III, Elmira, NY (US); Cheng-Chung Li, Redmond, WA (US); and Jean-Francois Oudard, Webster, NY (US)
Assigned to CORNING INCORPORATED, Corning, NY (US)
Appl. No. 16/977,332
Filed by CORNING INCORPORATED, Corning, NY (US)
PCT Filed Mar. 1, 2019, PCT No. PCT/US2019/020343
§ 371(c)(1), (2) Date Sep. 1, 2020,
PCT Pub. No. WO2019/169293, PCT Pub. Date Sep. 6, 2019.
Claims priority of provisional application 62/637,666, filed on Mar. 2, 2018.
Prior Publication US 2020/0408954 A1, Dec. 31, 2020
Int. Cl. G02B 1/115 (2015.01); B60K 35/22 (2024.01); B60R 13/02 (2006.01); C03B 23/023 (2006.01); C03C 17/34 (2006.01); G02B 1/113 (2015.01); G02B 27/00 (2006.01); C03C 15/00 (2006.01); C23C 14/08 (2006.01); C23C 14/34 (2006.01); C23C 28/00 (2006.01); C23C 28/04 (2006.01)
CPC G02B 1/115 (2013.01) [C03B 23/023 (2013.01); C03C 17/3411 (2013.01); C03C 17/3417 (2013.01); G02B 1/113 (2013.01); G02B 27/0018 (2013.01); B60K 35/22 (2024.01); B60R 13/02 (2013.01); C03C 15/00 (2013.01); C03C 2217/212 (2013.01); C03C 2217/213 (2013.01); C03C 2217/218 (2013.01); C03C 2217/734 (2013.01); C23C 14/08 (2013.01); C23C 14/083 (2013.01); C23C 14/34 (2013.01); C23C 28/042 (2013.01); C23C 28/40 (2013.01); C23C 28/42 (2013.01); C23C 28/44 (2013.01); Y10T 428/24479 (2015.01); Y10T 428/24942 (2015.01); Y10T 428/265 (2015.01); Y10T 428/315 (2015.01)] 20 Claims
OG exemplary drawing
 
1. An article comprising:
a substrate comprising a first major surface and a second major surface opposite the first major surface and separated therefrom by a thickness of the substrate; and
an anti-reflective coating disposed on the first major surface and comprising an anti-reflective surface opposite the first major surface,
wherein at a point on the anti-reflective surface of the anti-reflective coating, the article comprises a single-surface reflectance under a D65 illuminant having an angular color variation, ΔEθ, defined as:
ΔEθ=√{(a*θ1−a*θ2)2+(b*θ1−b*θ2)2}
where a*θ1 and b*θ1 are a and b values of the point measured from a first viewing angle θ1, and a*θ2 and b*θ2 are a and b values of the point measured from a second viewing angle θ2, θ1 and θ2 being any two different viewing angles at least 5 degrees apart in a range from about 10° to about 60° relative to a normal vector of the anti-reflective surface, and
wherein ΔEθ is less than 5,
wherein the anti-reflective surface comprises a single-surface reflected color with an a* value from about −2 to about 0, and a b* value from about −4 to about −1 at a viewing angle of about 10°,
wherein the anti-reflective surface exhibits an average visible photopic reflectance of 1% or less over viewing angles ranging from 0° to 40°,
wherein the anti-reflective coating comprises a stack of alternating high- and low-refractive index materials, wherein the low refractive index material comprises a refractive index, in a range from about 1.3 to 1.7 and the high refractive index material comprises a refractive index in a range from about 1.7 to about 2.5,
wherein the anti-coating coating comprises a buffer layer having a thickness of at least 20 nm disposed on the substrate such that the buffer layer is disposed between the substrate and the stack, wherein the buffer layer is constructed of a material having a refractive index within 5% of the refractive index of the substrate, and
wherein the anti-reflective coating comprises a coating thickness in a range from 200 nm to 300 nm.