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. 29, 2008
Filed:
Dec. 05, 2002
Matthijs Hendrik Keuper, San Jose, CA (US);
Robert Frans Maria Hendriks, Eindhoven, NL;
Matthijs Hendrik Keuper, San Jose, CA (US);
Robert Frans Maria Hendriks, Eindhoven, NL;
Philips Lumileds Lighting Company LLC, San Jose, CA (US);
Abstract
A compact backlight system for illuminating a display device () has a light-emitting panel () with a front wall () and an opposed rear wall () and with edge surfaces (). At least one of the edge surfaces () is light-transmitting. The backlight system has a light source () comprising a limited number of LEDs. Light from the light source () is coupled into the light-emitting panel () via the edge surface that is light-transmitting. According to the invention, the light-emitting panel () is wedge-shaped, and the surface area Sof the light-transmitting edge surface () and the surface area Sof the opposite edge surface () fulfill the relation: 1<(S/S)<10, preferably 1.5<(S/S)<5. Light travelling for the first time from the light-transmitting edge surface through the light-emitting panel () towards the opposite edge surface () cannot be coupled out of the light emitting panel ().