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:
Mar. 13, 2001
Filed:
Feb. 26, 1999
Seiji Umemoto, Osaka, JP;
Shuji Yano, Osaka, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A light guide plate in which the light incident on an entrance end surface is allowed to emerge from a bottom surface view a light issuing means formed on a top surface, with the direction of maximum intensity of the emerging light as measured in a plane perpendicular to the two reference planes defined by said entrance end surface and said bottom surface being within 30 degrees from the line normal to said bottom surface and wherein when the direction toward the entrance end surface away from said normal line taken as the reference is assumed to be negative, the intensity of the light leaking from the top surface at the same angle as the direction of said maximum intensity is no more than a tenth of said maximum intensity, with the incident light from the bottom surface being transmitted through the top surface; a planer light source unit having a light source adjacent the entrance end surface of the light guide plate; and a reflection-type liquid-crystal display device having a reflective layer furnished, liquid-crystal cell provided beneath the bottom surface of the planer light source unit.