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:
Oct. 30, 2012
Filed:
Dec. 02, 2009
Toshihisa Saito, Osaka, JP;
Masaru Furujiku, Osaka, JP;
Tsuyoshi Ishikawa, Tokyo, JP;
Eizaburo Higuchi, Tokyo, JP;
Toshihisa Saito, Osaka, JP;
Masaru Furujiku, Osaka, JP;
Tsuyoshi Ishikawa, Tokyo, JP;
Eizaburo Higuchi, Tokyo, JP;
Panasonic Corporation, Osaka, JP;
Nitto Jushi Kogyo Co., Ltd., Tokyo, JP;
Abstract
To solve an uneven light quantity caused in a case where a light guide plate, in which light from a spot light source such as an LED enters an surface, changes by 90 degrees and exits the light to the outside, is used as a backlight. The light guide plate of the invention includes a light flux unifying region. The light flux unifying region has an incident surface, a first surface, and an exit surface. Light fluxes emitted from a light source enter the incident surface. The first surface is almost perpendicular to the incident surface and the intensity distribution of the light fluxes having entered is unified at the first surface. The exit surface is disposed almost parallel with the incident surface and the unified light fluxes exit from the exit surface. A boundary line between the incident surface and the first surface has a zigzag surface.