Switching method for switching a liquid crystal polarizing grating between trnsmission difraction and reflection difraction
US12386234B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2024 |
| Grant date | Aug 12, 2025 |
| Priority date | — |
| Expiry date | Aug 14, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/0136
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A switching method for a liquid crystal polarizing grating is provided to solve the problems of low diffraction efficiency and incapability in switching between reflection and transmission modes of a conventional polarizing grating. The switching method includes five steps. In an initial step, no voltage is applied, and liquid crystal molecules of cholesteric liquid crystal layer of the liquid crystal polarizing grating are arranged in a planar structure. In a first step, a first alternating current voltage with a first frequency is applied. In a second step, a second alternating current voltage with a second frequency is applied. In a third step, a third alternating current voltage with a third frequency is applied. In a fourth step, a fourth alternating current voltage with a fourth frequency is applied, and the liquid crystal molecules are arranged in a uniform lying helix structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.