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:
May. 25, 2021
Filed:
Jan. 28, 2019
Dai Nippon Printing Co., Ltd., Tokyo, JP;
DAI NIPPON PRINTING CO., LTD., Tokyo, JP;
Abstract
A liquid crystal light control apparatus includes a liquid crystal light control film and power supply device that drives liquid crystal light control film. Liquid crystal light control film has a structure wherein liquid crystal layer is sandwiched between paired transparent electrode layers, and used by being adhered to a large transparent member. Power supply device supplies a predetermined AC voltage between terminals a and b of liquid crystal light control film. A condition |Z|≤α×RF is set where RF is a DC resistance between terminals a and b of liquid crystal light control film, |Z| is an output impedance between terminals A and B of power supply device, and predetermined coefficient α=0.2. In order to protect power supply device, condition Vp/Imax≤|Z|≤α×RF is set where Vp is output peak voltage of power supply device and Imax is maximum allowable current.