Title :
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
fDate :
5/1/2012 12:00:00 AM
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;
Journal_Title :
Consumer Electronics, IEEE Transactions on
DOI :
10.1109/TCE.2012.6227421
