Title:
OPTICAL ELEMENT AND IMAGE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2023/085398
Kind Code:
A1
Abstract:
Provided is an optical element having high diffraction efficiency of transmitted light, and an image display device using the optical element. This optical element includes at least a first optically anisotropic layer formed by using a liquid crystal composition containing a liquid crystal compound, and a second optically anisotropic layer formed by using a liquid crystal composition containing a liquid crystal compound. The first optically anisotropic layer and the second optically anisotropic layer have a liquid crystal alignment pattern in which an optical axis orientation derived from the liquid crystal compound changes while continuously rotating along at least one in-plane direction. A birefringence Δn1 of the first optically anisotropic layer and a birefringence Δn2 of the second optically anisotropic layer satisfy the relationship of expression (1), and the thickness T1 of the first optically anisotropic layer and the thickness T2 of the second optically anisotropic layer satisfy the relationship of expression (2) to diffract transmitted light. Expression (1) Δn1>Δn2 Expression (2) 0.002≤T2/T1≤0.3
Inventors:
SUZUKI MASAAKI (JP)
SATO HIROSHI (JP)
SATO HIROSHI (JP)
Application Number:
PCT/JP2022/042084
Publication Date:
May 19, 2023
Filing Date:
November 11, 2022
Export Citation:
Assignee:
FUJIFILM CORP (JP)
International Classes:
G02B5/30; G02B5/18; G02B27/02; G02F1/13; G09F9/00; G09F9/30
Domestic Patent References:
| WO2020166691A1 | 2020-08-20 | |||
| WO2019182129A1 | 2019-09-26 | |||
| WO2019221294A1 | 2019-11-21 | |||
| WO2019093228A1 | 2019-05-16 |
Foreign References:
| US6514578B1 | 2003-02-04 | |||
| JP2017522601A | 2017-08-10 | |||
| JP2014528597A | 2014-10-27 |
Attorney, Agent or Firm:
ITOH Hideaki et al. (JP)
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