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:
Apr. 14, 1998
Filed:
Nov. 13, 1995
Tzeng-Shii Tsai, Hsinchu Hsien, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
An improved high energy utilization efficiency backlighting device for liquid crystal displays is disclosed. It comprises: (a) a UV lamp with a UV transmitting quartz envelop for emitting and transmitting UV light; (b) a light guide disposed in front of the UV lamp which allows visible light to travel therethrough, the light guide having a front surface, a rear surface, and a proximal edge surface; (c) a lamp holder with a UV-reflecting interior surface, which, in cooperation with the proximal edge surface of the light guide, encloses the UV lamp; and (d) a fluorescent layer placed between the quartz envelop of the UV lamp and the proximal edge surface of the light guide capable of converting UV light into visible light. In a preferred embodiment, the UV-reflecting interior surface of the lamp holder is formed by coating with a layer of high-purity aluminum. The fluorescent layer is structured such that essentially none of the visible light converted from the UV light will travel therethrough. The fluorescent layer can be disposed on a portion of the exterior surface of the UV transmitting envelop facing the proximal edge surface of the light guide. Or the fluorescent layer can be formed on the proximal edge surface of the light guide. Furthermore, the proximal edge surface can be curved matching the curvature of the quartz envelope to further improve the energy utilization efficiency.