A highly power-efficient LED backlight driving system for LCD TVs

Author

Nam, Ki-Soo ; Kwon, Oh-Kyong

Author_Institution

Dept. of Electron. Eng., Hanyang Univ., Seoul, South Korea

Volume

58

Issue

2

fYear

2012

fDate

5/1/2012 12:00:00 AM

Firstpage

264

Lastpage

268

Abstract

A highly power-efficient light-emitting diode (LED) backlight driving system for liquid crystal display televisions (LCD TVs) to optimize the output voltage of boost converter is proposed. To optimize the output voltage, the forward voltage of each LED channel is analyzed and the turn-on sequence of LED channels is rearranged according to the forward voltages of LED channels. As a result, the output voltage tracks the required output voltage to drive target current in each LED channel. Experimental results show that the improvement of power efficiency is 3.8% in the proposed LED backlight driving system with 1% on-duty ratio of the pulse width modulation (PWM) signal and 5 V forward voltage variation of LED channels.

Keywords

light emitting diodes; liquid crystal displays; power convertors; television displays; LCD TV; LED channel analysis; PWM signal; boost converter; efficiency 3.8 percent; forward voltage variation; highly power-efficient LED backlight driving system; light-emitting diode; liquid crystal display televisions; on-duty ratio; output voltage tracks; pulse width modulation signal; turn-on sequence; voltage 5 V; Algorithm design and analysis; Current control; Educational institutions; Integrated circuits; Light emitting diodes; Pulse width modulation; Voltage control; Backlight; LCD TV; Light-emitting diode; Low power;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/TCE.2012.6227421

Filename

6227421