NANO WAVEGUIDE LENS AND AR DISPLAY DEVICE

WIPO Patent Application WO/2020/248535

A1

An AR display device, comprising a nano waveguide lens; the nano waveguide lens comprises a waveguide substrate (21) and a nano-level grating region that is provided on a surface of the waveguide substrate (21) and that is used for diffracting image light information to fulfill the total reflection of the waveguide substrate (21); the grating region comprises a first grating (23) for coupling the image light information such that same enters the waveguide substrate (21), a second grating (25) for changing the direction of the image light information conducted through the waveguide substrate (21), and a third grating (27) for projecting the image light information conducted through the second grating (25) and the waveguide substrate (21) into a space outside of the waveguide lens; the second grating (25) or/and the third grating (27) are provided in a height gradient or duty cycle gradient. The gradient of the grating(s) is used to reduce the brightness gradient, enhance the viewing angle effect, and increase the field of view, exit pupil distance or exit pupil range of the waveguide lens.

LUO MINGHUI (CN)
QIAO WEN (CN)
LI LING (CN)
LI RUIBIN (CN)
ZHOU ZHEN (CN)
XIONG JINYAN (CN)
CHEN LINSEN (CN)

PCT/CN2019/122598

December 17, 2020

December 03, 2019

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SVG TECH GROUP CO LTD (CN)
UNIV SOOCHOW (CN)

G02B5/18; G02B27/01

CN109407313A	2019-03-01
CN209895012U	2020-01-03
CN108700750A	2018-10-23
CN106842397A	2017-06-13
US20160231569A1	2016-08-11
CN106773057A	2017-05-31

SUZHOU JINHE INTELLECTUAL PROPERTY AGENCY (SPECIAL GENERAL PARTNERSHIP) (CN)

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