US 11,675,118 B2
Optically anisotropic film stack including solid crystal and fabrication method thereof
Tanya Malhotra, Redmond, WA (US); Tingling Rao, Bellevue, WA (US); Liliana Ruiz Diaz, Redmond, WA (US); Oleg Yaroshchuk, Kyiv (UA); Sheng Ye, Redmond, WA (US); Andrew John Ouderkirk, Kirkland, WA (US); Alexander Koshelev, Redmond, WA (US); Lafe Joseph Purvis, II, Redmond, WA (US); Junren Wang, Kirkland, WA (US); and Arman Boromand, Issaquah, WA (US)
Assigned to META PLATFORMS TECHNOLOGIES, LLC, Menlo Park, CA (US)
Filed by Meta Platforms Technologies, LLC, Menlo Park, CA (US)
Filed on Jun. 30, 2021, as Appl. No. 17/363,982.
Claims priority of provisional application 63/078,863, filed on Sep. 15, 2020.
Prior Publication US 2022/0082749 A1, Mar. 17, 2022
Int. Cl. G02B 5/30 (2006.01)
CPC G02B 5/3041 (2013.01) [G02B 5/3016 (2013.01); C09K 2323/03 (2020.08); C09K 2323/031 (2020.08); C09K 2323/035 (2020.08)] 15 Claims
OG exemplary drawing
 
1. A film stack, comprising:
a plurality of first films and a plurality of second films alternately stacked,
wherein at least one second film of the plurality of second films includes a solid crystal including crystal molecules aligned in a predetermined alignment direction,
wherein at least one first film of the plurality of first films includes an alignment structure configured to at least partially align the crystal molecules of the solid crystal in the predetermined alignment direction, and
wherein an in-plane optical anisotropy of the at least one second film is at least 0.5.