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Title:
MEDIUM-FREE PROJECTION SYSTEM
Document Type and Number:
WIPO Patent Application WO/2022/193780
Kind Code:
A1
Abstract:
The present application relates to the technical field of optics, and provides a medium-free projection system, comprising: a divergent beam emitted from a light source is collimated and homogenized by a light homogenizing rod and a first Fresnel lens and serves as incident light of a thin film crystal liquid crystal display screen, and a beam emitted from the thin film crystal liquid crystal display screen passes through a collimating optical element, and is converged by an imaging optical assembly into a target region to form an image, so that each point of the beam on an image plane fills an eye box. That is, the image suspended in air can be viewed by naked eyes in the range of the eye box, thereby realizing medium-free projection. The light homogenizing rod and the first Fresnel lens are arranged between the light source and the thin film crystal liquid crystal display screen, and the collimating optical element is arranged on a light exit side of the thin film crystal liquid crystal display screen, so that the main light rays of each field of view of the beam used for forming an image are approximately parallel, thereby further improving the brightness and the brightness uniformity of imaging in the target region, and thus achieving a clearer image display in the target region and improving the imaging quality of the final image and user experience.

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Inventors:
LIN XIAOLU (CN)
MA HONGHU (CN)
LIU FENGLEI (CN)
Application Number:
PCT/CN2021/142562
Publication Date:
September 22, 2022
Filing Date:
December 29, 2021
Export Citation:
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Assignee:
ZHEJIANG CRYSTAL OPTECH CO LTD (CN)
International Classes:
G02B27/01; G02B27/09; G02B27/30; G02B30/56
Domestic Patent References:
WO2019238540A12019-12-19
Foreign References:
CN112835199A2021-05-25
CN111948817A2020-11-17
CN111948818A2020-11-17
CN107543082A2018-01-05
Attorney, Agent or Firm:
CHOFN INTELLECTUAL PROPERTY (CN)
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