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:
Jul. 23, 2013
Filed:
Jun. 30, 2011
Qi Hong, Hudson, MA (US);
Karen A. Malburne, Hudson, MA (US);
Qi Hong, Hudson, MA (US);
Karen A. Malburne, Hudson, MA (US);
SKC Haas Display Films Co., Ltd., Choongchungnamdo, KR;
Abstract
The present invention provides a planar light guide film for a backlight unit having at least one point light source, the light guide film comprising a light input surface for receiving light from the point light source, a light redirecting surface for redirecting light received from the light input surface and a light output surface for outputting at least the light redirected from the light redirecting surface. The light input surface further comprises a composite lens structure having a circular tip segment with a first contact angle, and a first and second elliptical base segments with a second contact angle, the second contact angle being less than the first contact angle and the second contact angle being equal to each other and wherein the circular tip segment satisfies the following equation:+√{square root over (())}and the elliptical base segments satisfies the following equations:×√{square root over ((1−(()/))}×√{square root over ((1−(()/))}.