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:
Dec. 27, 2011
Filed:
Oct. 26, 2007
Yongwu Yang, Belmont, MA (US);
Yongwu Yang, Belmont, MA (US);
Other;
Abstract
An apparatus for attenuating the intensity of light transmitted through the apparatus is provided. In one embodiment, the apparatus may comprise a first polarizer having a first polarizing orientation and a second polarizer having a polarizing orientation perpendicular to the first polarizer. First and second electrodes are disposed between the polarizers and a nematic liquid crystal layer is disposed between the electrodes. At least one light detector positioned for measuring the intensity of the transmitted light may be positioned on an outer side of the second polarizer. A voltage controller in electrical communication with the light detector is provided for controlling the voltage level applied to the electrodes based on the intensity of the measured light wherein the voltage determines the amount of light transmitted through the apparatus.