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:
Mar. 27, 2007
Filed:
Jun. 16, 2005
Chin-der Wey, Houlong Township, Miaoli County, TW;
Ya-yun Yu, Banciao, TW;
Hsien-jen LI, Hemei Township, Changhua County, TW;
Yueh-pao Lee, Hukou Township, Hsinchu County, TW;
Chin-Der Wey, Houlong Township, Miaoli County, TW;
Ya-Yun Yu, Banciao, TW;
Hsien-Jen Li, Hemei Township, Changhua County, TW;
Yueh-Pao Lee, Hukou Township, Hsinchu County, TW;
AU Optronics Corporation, Hsinchu, TW;
Abstract
A driving circuit uses a plurality of transformers to provide currents for driving a plurality of LEDs associated with a plurality of current paths. Each transformer has two induction coils with a coil turn ratio between to the number of turns in each induction coil. One induction coil is used to provide an output current to a different current path and the other induction coil is connected to the corresponding induction coil of other transformers for forming a current loop. The output current of each transformer has a relationship with the output current of the other transformers depending on the coil turn ratios of the connected transformers. LEDs in red, blue and green colors can be connected to different current paths so that the brightness of the LEDs in each color can be determined by the current in a current path.