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. 29, 2012
Filed:
Jan. 22, 2008
Kenichi Matsumoto, Osaka, JP;
Koji Tanabe, Osaka, JP;
Kenichi Matsumoto, Osaka, JP;
Koji Tanabe, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
According to the input device of the present invention, phase-difference plate () with ¼ wavelength is disposed on the top surface of upper substrate () of touch panel (). As a result of passing through phase-difference plate (), lamplightthat illuminates LCD element () goes outside as outgoing-lightwith a phase-shift of ¼ wavelength. With the structure above, a user wearing polarized sunglasses—even if they have an absorption axis in a direction the same as that of lamplight—can easily recognize the displays shown by LCD element () on the back surface of touch panel (). The structure offers a user-friendly input device with good visibility of LCD element ().