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:
Jan. 08, 2008
Filed:
Sep. 02, 2005
Hsin-wu Lin, Taoyuan, TW;
Jen-chi Liu, Jhuci Township, Chiayi County, TW;
Jyh-haur Huang, Sinyuan Township, Pingtung County, TW;
Hsin-Wu Lin, Taoyuan, TW;
Jen-Chi Liu, Jhuci Township, Chiayi County, TW;
Jyh-Haur Huang, Sinyuan Township, Pingtung County, TW;
Au Optronics Corporation, Hsinchu, TW;
Abstract
The present invention uses different frequencies to drive the LED strips in the back-lighting source so that the spatial uniformity of the back-lighting source as well as the color levels in the source can be monitored and adjusted. Each individual strip is assigned to a different frequency. Alternatively, the strips are divided into groups and each group is assigned to a different frequency. A group may comprise two or more strips. Furthermore, some groups may have more strips than the other groups and the number of LEDs in one strip may be different from the number in other strips. The brightness uniformity and the color levels in the back-lighting source are sensed by one or more groups of color sensors in R, G and B. The assignment of driving frequencies can be based on the location of the strips.