Title:
DISPLAY DEVICE, DIFFRACTIVE OPTICAL WAVEGUIDE FOR DISPLAY, AND DESIGN METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2023/134671
Kind Code:
A1
Abstract:
A diffractive optical waveguide (1) for display, comprising a waveguide substrate (1a), and a coupling-in area (10) and a coupling-out area (20) which are disposed on the waveguide substrate (1a). A hybrid grating is formed in the coupling-out area (20) and the coupling-out area (20) comprises a plurality of subareas. The hybrid grating comprises a plurality of coupling-out gratings (21) and at least one light return grating (22) which are respectively formed in different subareas. The at least one light return grating (22) is located between the coupling-out gratings (21). The light return grating (22) in the hybrid grating can prevent light energy from leaving the coupling-out area (20), so that the light energy can be fully coupled out of the coupling-out gratings (21). Moreover, the light propagating in the coupling-out area (20) is allowed to be redirected/allocated more flexibly, so that the uniformity of an emergent light field is further improved.
Inventors:
ZHAO XINGMING (CN)
FAN ZHENTAO (CN)
TIAN KEHAN (CN)
FAN ZHENTAO (CN)
TIAN KEHAN (CN)
Application Number:
PCT/CN2023/071571
Publication Date:
July 20, 2023
Filing Date:
January 10, 2023
Export Citation:
Assignee:
BEIJING UPHOTON OPTOELECTRONICS DEV CO LTD (CN)
International Classes:
G02B5/18; G02B6/10; G02B27/01
Domestic Patent References:
| WO2021252672A1 | 2021-12-16 |
Foreign References:
| CN115166895A | 2022-10-11 | |||
| CN111679361A | 2020-09-18 | |||
| US20210215942A1 | 2021-07-15 | |||
| CN111065953A | 2020-04-24 | |||
| US20200386947A1 | 2020-12-10 |
Attorney, Agent or Firm:
BEIJING FANGKE LAW FIRM (CN)
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