The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 12, 2025
Filed:
Aug. 14, 2024
National Sun Yat-sen University, Kaohsiung, TW;
NATIONAL SUN YAT-SEN UNIVERSITY, Kaohsiung, TW;
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.