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. 16, 1999
Filed:
Apr. 03, 1997
Atsushi Fukui, Osaka, JP;
Kanji Nishii, Osaka, JP;
Kenji Takamoto, Osaka, JP;
Masami Ito, Osaka, JP;
Kazumasa Takata, Osaka, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A back light illuminator for liquid crystal display apparatus comprises a fluorescent lamp, a light guide member, and a reflection plate enclosing the fluorescent lamp and an incident portion of the light guide member so as to reflect light rays toward the incident portion of the light guide member. The reflection plate has at least a curved portion having a parabolic cross-section or a elliptical cross-section so as not to reflect the light rays in a direction to the fluorescent lamp. Thus, absorption of reflected light by the fluorophor of the fluorescent lamp is minimized, and the luminance of the back light illuminator is increased.