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:
Jun. 17, 1997
Filed:
Mar. 19, 1996
Falcon Lin, HsinChu, TW;
CTX Opto-Electronics Corp., Hsinchu, TW;
Abstract
A backlighting system for liquid crystal display (LCD) panels is disclosed to comprise at least a light source and a light pipe for receiving the light generated by the light source to provide the backlighting for the LCD panel. The light pipe consists of a flat front surface facing the LCD panel, a back surface facing the opposite direction to the LCD panel, and an end surface adjacent to the light source. The front surface extends toward the longitudinal direction away from the light source. The back surface consists of a plurality of parallel sections in parallel with the front surface, and connecting sections connecting adjacent parallel sections. The gap between the parallel section and the front surface decreases as the distance between the parallel section and the light source in the longitudinal direction increases. The system is characterized by the fact that the connecting sections on the back surface of the light pipe comprises at least two surfaces inclined to the parallel sections forming successive roof-shaped structures along the direction perpendicular to the longitudinal direction. This geometry increases the angle between the normal vector of the inclined surfaces and the incident vector of the incident light, thus reducing the portion of light editing the inclined surfaces out of the light pipe. The angle between two adjacent inclined surfaces is between 60 to 120 degrees.