US 12,030,806 B2
Cover glass sheet
Fabrice Sinapi, Spy (BE); Etienne Degand, Wezembeek-Oppem (BE); Ingrid Marenne, Forville (BE); and Zakaria Habibi, Braine l'Alleud (BE)
Assigned to AGC GLASS EUROPE, Louvain-la-Neuve (BE)
Appl. No. 17/265,900
Filed by AGC GLASS EUROPE, Louvain-la-Neuve (BE)
PCT Filed Aug. 7, 2019, PCT No. PCT/EP2019/071224
§ 371(c)(1), (2) Date Feb. 4, 2021,
PCT Pub. No. WO2020/030695, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 18188004 (EP), filed on Aug. 8, 2018.
Prior Publication US 2021/0163344 A1, Jun. 3, 2021
Int. Cl. C03C 15/00 (2006.01); G02B 5/02 (2006.01)
CPC C03C 15/00 (2013.01) [G02B 5/0221 (2013.01); G02B 5/0268 (2013.01); G02B 5/0278 (2013.01); G02B 5/0294 (2013.01)] 17 Claims
OG exemplary drawing
 
17. A cover glass sheet configured to cover a display element, comprising:
a first textured surface having a surface roughness defined by a first arithmetic amplitude value, Ra1,
a first spacing value, Rsm1, wherein both values are measured on an evaluation length of 12 mm and with a Gaussian filter wherein the cut-off wavelength is 0.8 mm,
a first transmission haze value, Haze1, equal to or lower than 10%, (Haze1≤10%), and
a first clarity value, Clarity1, and a second textured surface having a second transmission haze value, Haze2;
wherein the second transmission haze value, Haze2, is equal to or lower than a maximum haze value, HazeMax (Haze2≤HazeMax) wherein:
HazeMaxB=(4.99−((8.13×10−1)(Haze1)))+((4.67×10−2)(Clarity1))%   [Equation (A)].