A local-dimming LED BLU driving circuit for a 42-inch LCD TV

Author

Park, Yu-Cheol ; Kim, Hee-Jun ; Lee, Back-Haeng ; Shin, Dong-Hyun

Author_Institution

Intell. Vehicle Technol. R&D Center, KATECH, South Korea

fYear

2009

fDate

18-22 Oct. 2009

Firstpage

1

Lastpage

6

Abstract

This paper presents an LED BLU driving circuit with a local-dimming structure. The efficiency of the proposed LED driver has been improved by parallel driving 8 serial-connected LED arrays. It employed the soft-switching boost converter topology to reduce the switching power loss of the hard switching boost converter. The soft-switching converter reveals superior ripple and efficiency. A smaller inductance can be used for the soft-switching converter contrasting to the hard-switching one and studied on an over-voltage protection circuit of the output of the driver at the no load condition.

Keywords

LED displays; driver circuits; liquid crystal displays; overvoltage protection; power convertors; television displays; LCD TV; LED arrays; LED driver; local-dimming LED BLU driving circuit; over-voltage protection circuit; soft-switching boost converter topology; Automotive engineering; Circuit topology; Energy consumption; Light emitting diodes; Light sources; Protection; Pulse width modulation; Pulse width modulation converters; Switching converters; TV;

fLanguage

English

Publisher

ieee

Conference_Titel

Telecommunications Energy Conference, 2009. INTELEC 2009. 31st International

Conference_Location

Incheon

Print_ISBN

978-1-4244-2490-0

Electronic_ISBN

978-1-4244-2491-7

Type

conf

DOI

10.1109/INTLEC.2009.5351895

Filename

5351895