Proceedings of the KIPE Conference (전력전자학회:학술대회논문집)

The Korean Institute of Power Electronics (전력전자학회)
권호 표지

Design of the backlight inverter for multi-lamp driving

  • Han Jae Hyun (RRC & Dept. of Electrical Engineering, Chonnam National University) ;
  • Lim Young Cheol (RRC & Dept. of Electrical Engineering, Chonnam National University) ;
  • Yang Seung Hak (RRC & Dept. of Electrical Engineering, Honam University) ;
  • Kweon Gie Hyoun (Thin Film Tech. Research Center, Korea Institute of Science and Technology)
  • Published : 2001.10.01
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Abstract

As a LCD monitor is larger and thinner, a Cold Cathode Fluorescent Lamp (CCFL) for backlight in LCD monitor gradually becomes longer and thinner. The backlight of a large LCD monitor, however, has a limitation in its brightness. In this study, a parallel multi-lamp is used in order to supply enough brightness. Though the CCFLs are made through a detail and equal manufacturing process, they don't have exactly the same features individually in their brightness, frequency, voltage and current. Consequently, it is difficult to have equal brightness at an early lighting condition or during lighting time. In this paper, a parallel multi-lamp which can have the same output under the same condition is designed. For this, 18 inch LCD monitor with four lamps is used. An inverter for multi-lamp driving is also used in this study. The newly designed inverter shows more than $90\%$ efficiency in its brightness input and output. Besides, it is also available for a multi-drive of other lamps.

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