Light guide element comprising a diffraction element having a cholesteric liquid crystal layer with a pitch gradient
US11886071B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 30, 2022 |
| Grant date | Jan 30, 2024 |
| Priority date | — |
| Expiry date | Sep 30, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0172
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light guide element includes: a light guide plate; and a diffraction element that is disposed on a main surface of the light guide plate, in which the diffraction element includes a liquid crystal layer that is formed of a liquid crystal composition including a liquid crystal compound and has a liquid crystal alignment pattern in which a direction of an optical axis derived from the liquid crystal compound changes while continuously rotating in at least one in-plane direction, a refractive index of the light guide plate is 1.70 or higher, and in a case where the refractive index of the light guide plate is represented by nd and a refractive index of the liquid crystal layer is represented by nk, nk−nd≥0 is satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.