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:
Nov. 17, 2009
Filed:
Aug. 22, 2007
Applicants:
Ching-cherng Sun, Jhongli, TW;
Tsung-hsun Yang, Jhongli, TW;
Chih-to Hsieh, Jhongli, TW;
Inventors:
Assignee:
National Central University, Jhongli, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J 1/32 (2006.01);
U.S. Cl.
CPC ...
Abstract
A direct-light-type backlight module uses optical feedback to control point light sources for obtaining a default luminance. Each point light source drives a section in a cyclic time domain to emit a light. A photo detector detects a brightness and the brightness is thus controlled by the optical feedback from the photo detector.