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:
Aug. 26, 2003
Filed:
Aug. 06, 2001
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A backlight has light sources , a flat-plate-shaped light guide plate for guiding the light emitted from the light sources in a predetermined direction, a light shield louver , disposed so as to face the light guide plate , for shielding part of the light emerging from the light guide plate according to angles of incidence, and a prism sheet for converting the brightness distribution of the light incident on the light shield louver into a predetermined brightness distribution. Owing to the prism sheet , the light incident on the light shield louver exhibits a brightness distribution such that brightness is at a minimum at an angle of incidence of 0°. Thus, the backlight , and a liquid crystal display device employing it, permits light to emerge therefrom within a desired range of viewing angles while offering high brightness within that range, with reduced degradation of viewability.