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Thermal Characteristics of LED Light Source in Flat Panel Display Backlight System

[+] Author Affiliations
Sung Ki Kim, Joon Kang

Samsung Electronics, Suwon, South Korea

Seo Young Kim

Korea Institute of Science and Technology, Seoul, South Korea

Paper No. IPACK2007-33913, pp. 273-276; 4 pages
doi:10.1115/IPACK2007-33913
From:
  • ASME 2007 InterPACK Conference collocated with the ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference
  • ASME 2007 InterPACK Conference, Volume 1
  • Vancouver, British Columbia, Canada, July 8–12, 2007
  • Conference Sponsors: Electronic and Photonic Packaging Division
  • ISBN: 0-7918-4277-0 | eISBN: 0-7918-3801-3
  • Copyright © 2007 by ASME

abstract

Light Emitting Diode (LED) begins to be applied as backlight system in a flat panel display because of local dimming function, wide color gamut, longer lifetime and environmental-friendly feature. The performance of LED device is strongly dependent on the operating temperature, however, the operation beyond temperature limit could cause the luminosity decrease, wavelength shift and lifetime decrease including failure of electrode soldering in the package. Therefore, the thermal management in a LED backlight system is crucial to guarantee the image quality and the reliability of the display. However, narrow volume of flat panel displays cause low convective heat transfer showing non-uniform temperature distribution over the panel. It deteriorates the image quality that the inherent temperature difference over the flat panel display backlight system. The objective of present study aimed to investigate the effect of LED alignment in a direct-illuminating type backlight system. It is discussed thermal characteristics of backlights in flat panel with LED light source and evaluated performance of the heat spreading system to ensure the reliability of LED backlight system.

Copyright © 2007 by ASME
Topics: Light sources

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