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EP 4 158 700 A1

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(43) Date of publication: 05.04.2023 Bulletin 2023/14 (21) Application number: 20729722.7 (22) Date of filing: 29.05.2020

(51) International Patent Classification (IPC):  H01L 41/09(2006.01) H04R 17/00(2006.01) (52) Cooperative Patent Classification (CPC): H04R 2201/003; H04R 17/00; H10N 30/2044; H10N 30/2046 (86) International application number: PCT/EP2020/064945 (87) International publication number: WO 2021/239243 (02.12.2021 Gazette 2021/48)

(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 (71) Applicants: Huawei Technologies Co., Ltd. Longgang District, Shenzhen, Guangdong 518129 (CN) University Of Southampton Southampton SO17 1BJ (GB)

(72) Inventors: HOFFMANN, Falk-Martin Southampton University Road Southampton SO17 1BJ (GB) FAZI, Filippo, Maria Southampton University Road Southampton SO17 1BJ (GB) WHITE, Neil Southampton University Road Southampton SO17 1BJ (GB) HOLLAND, Keith Southampton University Road Southampton SO17 1BJ (GB) HARRIS, Nick Southampton University Road Southampton SO17 1BJ (GB) FONTANA, Simone 80992 Munich (DE) GROSCHE, Peter 80992 Munich (DE) (74) Representative: Thun, Clemens  Mitscherlich PartmbB Patent- und Rechtsanwälte Sonnenstraße 33 80331 München 80331 München (DE)