Liquid crystal diffraction element, optical element, image display unit, head-mounted display, beam steerer, and sensor

By designing the liquid crystal alignment pattern of the optical anisotropic layer, the diffraction efficiency of the liquid crystal diffraction element in the visible light region is made independent of wavelength, solving the problem of high wavelength dependence in the existing technology and improving the performance of AR glasses and VR head-mounted displays.

CN122218862APending Publication Date: 2026-06-16FUJIFILM CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUJIFILM CORP
Filing Date
2021-09-01
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

Existing liquid crystal diffraction elements exhibit a high wavelength dependence in diffraction efficiency across the entire visible light spectrum, making it impossible to diffract light of different wavelengths with the same efficiency, which affects the performance of AR glasses and VR head-mounted displays.

Method used

Design a liquid crystal diffraction element whose optical anisotropy layer has a liquid crystal alignment pattern that is continuously rotated in-plane along the optical axis derived from the liquid crystal compound, and has bright and dark parts extending from one surface to another in the cross-sectional SEM image, with the dark part having more than two angular inflection points, and the period length of the optical axis rotating 180° is constant.

Benefits of technology

It enables the diffraction of light with the same diffraction efficiency regardless of wavelength in the visible light region, improving the performance of AR glasses and VR head-mounted displays.

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Abstract

To provide a liquid crystal diffraction element in which wavelength dependence of diffraction efficiency is small and the same angle is diffracted at the same wavelength, an optical element using the same, and an image display unit, a head-mounted display, a beam steerer, and a sensor using the same. The liquid crystal diffraction element includes an optically anisotropic layer containing a liquid crystal compound, the optically anisotropic layer has a liquid crystal alignment pattern in which the orientation of the optical axis of the liquid crystal compound continuously rotates in one direction, in an image of a cross section observed using a scanning electron microscope, has a bright portion and a dark portion extending from one surface to the other surface, the dark portion has an inflection point of an angle of 2 or more, and further has regions in which the inclination direction of the dark portion is different in the thickness direction, thereby solving the problem.
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