Patent SG-11201906700V-A (SG)
Title: Waveguide for an augmented reality or virtual reality display
Inventor: GREY DAVID JAMES
IPC: G02B27/01
Filed: 2018-03-16
Abstract: I H2 H3 14 FIG.3 H1 Y AXIS X AXIS (12) INTERNATIONAL APPLICATION PUBLISHED UNDER THE PATENT COOPERATION TREATY (PCT) (19) World Intellectual Property Organization International Bureau (43) International Publication Date 04 October 2018 (04.10.2018) W I PO I PCT ill 1111u°11111VIIIVIIII o VIVIDinim imio oimIE (10) International Publication Number WO 2018/178626 Al (51) International Patent Classification: GO2B 27/00 (2006.01) GO2B 27/01 (2006.01) F21V 8/00 (2006.01) GO2B 5/18 (2006.01) GO2B 27/42 (2006.01) (21) International Application Number: PCT/GB2018/050697 (22) International Filing Date: 16 March 2018 (16.03.2018) (25) Filing Language: English (26) Publication Language: English (30) Priority Data: 1705160.8 30 March 2017 (30.03.2017) GB (71) Applicant: WAVE OPTICS LTD [GB/GB]; 99 Park Dri- ve, Milton Park, Abingdon, Oxfordshire OX14 4RY (GB). (72) Inventors: GREY, David James; Wave Optics Ltd., 99 Park Drive, Milton Park, Abingdon, Oxfordshire OX14 4RY (GB). VALERA, Mohmed Salim; Wave Optics Ltd, 99 Park Drive, Milton Park, Abingdon, Oxfordshire OX14 4RY (GB). (74) Agent: GILL JENNINGS & EVERY LLP; The Broadgate Tower, 20 Primrose Street, London EC2A 2ES (GB). (81) Designated States (unless otherwise indicated, for every kind of national protection available): AE, AG, AL, AM, AO, AT, AU, AZ, BA, BB, BG, BH, BN, BR, BW, BY, BZ, CA, CH, CL, CN, CO, CR, CU, CZ, DE, DJ, DK, DM, DO, DZ, EC, EE, EG, ES, FI, GB, GD, GE, GH, GM, GT, HN, HR, HU, ID, IL, IN, IR, IS, JO, JP, KE, KG, KH, KN, KP, KR, KW, KZ, LA, LC, LK, LR, LS, LU, LY, MA, MD, ME, MG, MK, MN, MW, MX, MY, MZ, NA, NG, NI, NO, NZ, OM, PA, PE, PG, PH, PL, PT, QA, RO, RS, RU, RW, SA, SC, SD, SE, SG, SK, SL, SM, ST, SV, SY, TH, TJ, TM, TN, TR, TT, TZ, UA, UG, US, UZ, VC, VN, ZA, ZM, ZW. (84) Designated States (unless otherwise indicated, for every kind of regional protection available): ARIPO (BW, GH, GM, KE, LR, LS, MW, MZ, NA, RW, SD, SL, ST, SZ, TZ, UG, ZM, ZW), Eurasian (AM, AZ, BY, KG, KZ, RU, TJ, TM), European (AL, AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, HR, HU, IE, IS, IT, LT, LU, LV, MC, MK, MT, NL, NO, PL, PT, RO, RS, SE, SI, SK, SM, TR), OAPI (BF, BJ, CF, CG, CI, CM, GA, GN, GQ, GW, KM, ML, MR, NE, SN, TD, TG). (54) Title: WAVEGUIDE FOR AN AUGMENTED REALITY OR VIRTUAL REALITY DISPLAY X AXIS FIG.1 V AXIS (57) : A waveguide is disclosed for use in an augmented reality or virtual reality display. The waveguide includes a plurality of optical structures (10, 20, 30, 40, 50, 60, 70, 80) exhibiting differences in refractive index from a surrounding waveguide medium. The optical structures are arranged in an array to provide at least two diffractive optical elements (H1, H2) overlaid on one another in the waveguide. Each of the two diffractive optical elements is configured to receive light from an input direction and couple it towards the other diffractive optical element which can then act as an output diffractive optical element, providing outcoupled orders towards a viewer. The optical structures have a shape, when viewed in the plane of the waveguide, comprising a plurality of substantially straight sides having respective normal vectors at different angles and this can effectively reduce the amount of light that is coupled out of the waveguide on first interaction with the optical structures. [Continued on next page] WO 2018/178626 Al MIDEDIMOMMIDEFIEDMOINEROIOHERMOVOIS Published: — with international search report (Art. 21(3))