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(11)

EP 3 877 804 A1

(12)

(43) Date of publication: 15.09.2021 Bulletin 2021/37 (21) Application number: 20713122.8 (22) Date of filing: 05.02.2020

(51) International Patent Classification (IPC):  G02B 27/01(2006.01) H01L 27/12(2006.01) H01L 27/06(2006.01) H01L 27/146(2006.01) (52) Cooperative Patent Classification (CPC): G02B 27/0172; H01L 27/13 (86) International application number: PCT/US2020/016727 (87) International publication number: WO 2020/163436 (13.08.2020 Gazette 2020/33)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR Designated Extension States: BA ME Designated Validation States: KH MA MD TN (30) Priority: 05.02.2019 US 201962801424 P 13.06.2019 US 201962861254 P 19.06.2019 US 201962863659 P 22.10.2019 US 201916660648 22.10.2019 US 201916660643 22.10.2019 US 201962924604 P 03.02.2020 US 202016780486 (71) Applicant: Facebook Technologies, LLC. Menlo Park, CA 94025 (US)

(72) Inventors: FABIEN, Chloe, Astrid Marie Menlo Park, CA 94025 (US) GRUNDMANN, Michael Menlo Park, CA 94025 (US) MORRIS, Daniel Henry Menlo Park, CA 94025 (US) GOWARD, John Menlo Park, CA 94025 (US) (74) Representative: Murgitroyd & Company  Murgitroyd House 165-169 Scotland Street Glasgow G5 8PL Glasgow G5 8PL (GB)