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. 20, 2010
Filed:
Feb. 21, 2008
Wai-hon Lee, Los Altos, CA (US);
Wai-Hon Lee, Los Altos, CA (US);
Finity Labs, Mountain View, CA (US);
Abstract
A back light module where one of the top and bottom surfaces of the light guide contain a micro Fresnel lens array which is off-axis so that a portion of the light won't initially escape from the back light module. The light is reflected down the length of the light guide, spreading the light across the back light module. In one embodiment, the Fresnel lens array is designed to have its efficiency vary across the back light. A smaller percentage of the light is directed out of the module near the light source, with most of the light being directed down the light guide. In an LED embodiment, the LED is mounted on the top or bottom edge of the light guide with a diffraction structure on the opposite side to diffract the light down the light guide.