NEAR-TO-EYE DISPLAY SYSTEM FOR PUPIL EXPANSION BASED ON DIFFRACTIVE OPTICAL ELEMENT

Title:

NEAR-TO-EYE DISPLAY SYSTEM FOR PUPIL EXPANSION BASED ON DIFFRACTIVE OPTICAL ELEMENT

Document Type and Number:

WIPO Patent Application WO/2021/056992

Kind Code:

A1

Abstract:

A near-to-eye display system for pupil expansion based on a diffractive optical element, comprising: a laser light source (1) or an LED light source; a diffusion sheet (2) disposed on an emergent light path of the laser light source (1) or the LED light source; a MEMS scanning mirror (3) disposed on an emergent light path of the diffusion sheet (2); a diffractive optical element (4) disposed on an emergent light path of the MEMS scanning mirror (3); a collimating lens module (5) disposed on an emergent light path of the diffractive optical element (4); a reflective mirror (6) disposed on an emergent light path of the collimating lens (5); and a reflective diffraction structure disposed on a reflective light path of the reflective mirror (6), to enable human eyes (9) to see superposed images of real world and virtual world. The near-to-eye display system can expand the angle of field of view while simplifying a production process and reducing processing difficulty and production cost.

Inventors:

SONG QIANG (CN)
TANG XIAOYUN (CN)
XU HENGSHEN (CN)
MA GUOBIN (CN)
WANG TAO (CN)

Application Number:

PCT/CN2020/080207

Publication Date:

April 01, 2021

Filing Date:

March 19, 2020

Export Citation:

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Assignee:

SHENZHEN LOCHN OPTICS TECH CO LTD (CN)

International Classes:

G02B27/01; G02B27/00

Domestic Patent References:

WO2019174447A1

2019-09-19

Foreign References:

CN105676454A	2016-06-15
CN110456512A	2019-11-15
CN110221428A	2019-09-10
US20160282615A1	2016-09-29
US20130208362A1	2013-08-15
CN201910903337A	2019-09-24

Other References: