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:
Nov. 23, 2004
Filed:
Jun. 04, 2002
Tetsuyuki Kurata, Hyogo, JP;
Takahiro Nishioka, Hyogo, JP;
Yoshihiro Togashi, Aichi, JP;
Susumu Sato, Akita, JP;
Other;
Abstract
An apparatus for detecting a pretilt angle is comprised of a light source a polarizer a liquid-crystal cell a quarter-wave plate an analyzer a photodetector and a processing device. The processing device receives from the photodetector transmitted light intensities of light that is transmitted through the liquid-crystal cell at a plurality of light incident angles. The processing device calculates Stokes parameters corresponding to the plurality of light incident angles based upon the transmitted light intensity corresponding to the plurality of light incident angles. Furthermore, an apparent retardation corresponding to the plurality of light incident angles is determined based upon the Stokes parameters corresponding to the plurality of light incident angles. The pretilt angle of the liquid-crystal cell is determined based upon the determined apparent retardation corresponding to the plurality of light incident angles.