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Journal of the Optical Society of Korea

Journal of the Optical Society of Korea

| PUBLISHED BY THE OPTICAL SOCIETY OF KOREA

  • Vol. 12, Iss. 3 — Sep. 25, 2008
  • pp: 174–177

Study on the Luminance Properties of Optical Films for Flat-lamp Backlight Applications

Mi-Yeon Yu, Ji-Hee Park, and Jae-Hyeon Ko  »View Author Affiliations


Journal of the Optical Society of Korea, Vol. 12, Issue 3, pp. 174-177 (2008)


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Abstract

The luminance properties of FFL(Flat Fluorescent Lamp) backlights have been investigated in detail for the first time. The on-axis luminance gain as well as viewing-angle characteristics on various combinations of optical films were obtained from FFL backlight and compared to the results of conventional CCFL(cold-cathode fluorescent lamps) backlights. It was found that the on-axis luminance gains achieved by using optical films in the FFL backlight were lower than those in the CCFL backlight indicating that the recycling processes occurring between optical films and light sources/reflection sheet are not so effective in the FFL backlight due to the much larger area of, and thus higher absorption probability of the FFL. This result suggests that new optical films should be developed for FFL backlight and other flat-lamp backlight technologies.

© 2008 Optical Society of Korea

OCIS Codes
(120.2040) Instrumentation, measurement, and metrology : Displays
(150.2950) Machine vision : Illumination
(230.3720) Optical devices : Liquid-crystal devices

History
Original Manuscript: July 15, 2008
Revised Manuscript: August 14, 2008
Manuscript Accepted: August 19, 2008
Published: September 25, 2008

Citation
Mi-Yeon Yu, Ji-Hee Park, and Jae-Hyeon Ko, "Study on the Luminance Properties of Optical Films for Flat-lamp Backlight Applications," J. Opt. Soc. Korea 12, 174-177 (2008)
http://www.opticsinfobase.org/josk/abstract.cfm?URI=josk-12-3-174


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References

  1. J.-H. Ko, "Recent Research Trends in the Development of New Light Sources for the Backlight Unit of Liquid Crystal Display," Asian J. Phys., vol. 14, pp. 231-237, 2005
  2. J. H. Kim et al., "Two-dimensionally integrated fluorescent lamp for 40 inch LCD-TV application," IMID"04 Digest, pp. 795-798, 2004
  3. J. -H. Park, and J. -H. Ko, "Optimization of the Emitting Structure of Flat Fluorescent Lamps for LCD Backlight Applications," J. Opt. Soc. Korea, vol. 11, pp. 18-123, 2007
  4. J. Jeong, J. Kim, M. Shin, M. Lee, J. Chung, H. Jeong, J. Kim, J. Kang, B. Hong, and G. Cho, "Luminance Normalization of Optical Sheets in a Backlight Unit for LCD-TVs," J. Korean Vac. Soc ., vol. 16, pp. 424-243, 2007 (in Korean)
  5. J. H. Lee, Y. H. Ju, J. -H. Park, J. -Y. Lee, K. -B. Nahm, J. -H. Ko, and J. H. Kim, J. Information Display, vol. 9, pp. 26-32, 2008
  6. G. J. Park, T. S. Aum, D. H. Lee, J. H. Kwon, M. H. Lee, B. K. Jung, and H. S. Soh, "Enhancement of Luminance and View Angle by Optimizing the Structure of Prism Sheet and the Diffusivity of Reflective Polarizer Film," IDW"06 Digest, pp. 953-956, 2006
  7. Y. H. Ju, J. -H. Park, J. H. Lee, J. -Y. Lee, K. -B. Nahm, J. -K. Ko, and J. H. Kim, "Study on the Simulation Model for the Optimization of Optical Structures of Edge-lit Backlight for LCD Applications," J. Opt. Soc. Korea, vol. 12, pp. 25-30, 2008 [CrossRef]
  8. J. -H. Park, H. S. Lee, M. -Y. Yu, Y. -Y. Kim, J. -H. Ko, S. -E. Lee, and S. -H. Yi, "Optimization of Light-Output Characteristics of Flat Fluorescent Lamps (FFLs) by Using Micro-lens Arrays," IDW"07 Digest, pp. 719-720, 2007

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