Digital Lamp Balance System With Individual Lamp Current Control Capability for an LCD TV

A digital lamp balance system that equalizes lamp current of liquid crystal display (LCD) backlight is implemented in this letter. The proposed digital balance circuit consists of a balance switch which is in series with the lamp and a dc-blocking capacitor which also acts as a ballast capacitor for...

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Bibliographic Details
Published in:IEEE transactions on power electronics 2012-02, Vol.27 (2), p.637-641
Main Authors: CHO, Je-Hyung, PARK, Sang-Hyun, SEONG, Hyun-Wook, KIM, Hyoung-Suk, PARK, Jin-Sik, CHOI, Eun-Seok, YOUN, Myung-Joong
Format: Article
Language:English
Subjects:
Applied sciences
Backlight unit
Capacitors
Circuit properties
Circuits
cold cathode fluorescent lamp (CCFL)
Controllers
Digital circuits
Display
electric ballast
Electric, optical and optoelectronic circuits
Electrical engineering. Electrical power engineering
Electrical equipment
Electrical machines
Electronic ballasts
Electronic circuits
Electronics
Exact sciences and technology
Imaging devices
Impedance
Inverters
lamp current balance
Lamps
LCDs
liquid crystal display (LCD) TV
Liquid crystal displays
Regulation and control
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Switches
Switching circuits
Television
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Description
Summary:A digital lamp balance system that equalizes lamp current of liquid crystal display (LCD) backlight is implemented in this letter. The proposed digital balance circuit consists of a balance switch which is in series with the lamp and a dc-blocking capacitor which also acts as a ballast capacitor for parallel lighting. The parasitic capacitance of the balance switch is used as parallel impedance which makes the lamp current decrease. Microcontroller unit controls each lamp current by changing the pulsewidth modulation duty ratio of a balance switch. The specified circuit, analysis, balance principles, and experimental results of the proposed system will be presented for a 46-in LCD TV.
ISSN:0885-8993
1941-0107
DOI:10.1109/TPEL.2011.2172819