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:
Apr. 06, 2021
Filed:
Nov. 05, 2019
Coretronic Corporation, Hsin-Chu, TW;
Haw-Woei Pan, Hsin-Chu, TW;
Yao-Shun Lin, Hsin-Chu, TW;
Coretronic Corporation, Hsin-Chu, TW;
Abstract
A polarization rotation device including a rotation shaft, a driving element, a polarization element and a reflective element is provided. The polarization element is disposed on a transmission path of the at least one excitation light beam. The reflective element is disposed on a side of the polarization element. The driving element drives the polarization element to sequentially rotate with the rotation shaft as a rotation center axis. When the polarization element rotates, the excitation light beam is transmitted to the polarization element and passes through the polarization element and is again transmitted to and passes through the polarization element by the reflective element. The excitation light beam outputting from the polarization rotation device has different polarization states at different time periods. A projection device applying the polarization rotation device of the invention achieves the effect of uniform color or brightness when displaying images in a 3D display mode.