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:
May. 11, 2010
Filed:
Apr. 19, 2007
Hung-min Shih, Hsin-chu, TW;
Tsung-shiun Lee, Hsin-chu, TW;
Chia-hung Sun, Hsin-chu, TW;
Huang-de Lin, Hsin-chu, TW;
Hung-Min Shih, Hsin-chu, TW;
Tsung-Shiun Lee, Hsin-chu, TW;
Chia-Hung Sun, Hsin-chu, TW;
Huang-De Lin, Hsin-chu, TW;
AU Optronics Corporation, Hsinchu, TW;
Abstract
A backlight system for use in an LCD display with a driver providing current sink control includes an LED array module, a current feedback circuit, and a current compensation circuit. The LED array module has N columns of LEDs and each LED column has M LEDs connected in serial, wherein the current feedback circuit includes N current feedback units and the current compensation circuit includes N current compensation units, both of the current feedback circuit and the current compensation circuit being electrically coupled to the LED array module. When the backlight system is in operation, a current passes through an LED column, a current feedback unit, and a current compensation unit to generate an output voltage that is used for comparison with a predetermined DC voltage, and the current is compensated based on the results of the comparison.