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. 15, 2010
Filed:
Apr. 04, 2007
Jung Chul Gong, Seoul, KR;
Byoung Own Min, Gyunggi-Do, KR;
Sang Cheol Shin, Gyunggi-Do, KR;
Chang Woo Ha, Gyunggi-Do, KR;
Jung Chul Gong, Seoul, KR;
Byoung Own Min, Gyunggi-Do, KR;
Sang Cheol Shin, Gyunggi-Do, KR;
Chang Woo Ha, Gyunggi-Do, KR;
Samsung Electro-Mechanics Co., Ltd., Gyunggi-Do, KR;
Abstract
In a driving circuit for an LCD backlight, a fundamental wave generator generates a triangle wave signal and a square wave signal in accordance with time constant of a time constant circuit including a time constant capacitor. A PWM comparator compares a difference signal between a feedback voltage and a preset reference voltage with the triangle wave signal to generate a PWM signal in response to the comparison result. A signal synchronizer sets a connection node between the time constant capacitor and the fundamental wave generator and an output terminal of the square wave signal in accordance with a power level of the LCD backlight. Also, a driving signal generator generates a driving signal in response to the square wave signal from the fundamental wave generator and the PWM signal from the PWM comparator. The driving circuit enables PWM controlling integrated circuits to be synchronized together.