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

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

Asian J. Phys.

• 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

IDW'06 Digest

• 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

IDW'07 Digest

• 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

IMID'04 Digest

• J. H. Kim et al., "Two-dimensionally integrated fluorescent lamp for 40 inch LCD-TV application," IMID"04 Digest, pp. 795-798, 2004

J. Information Display

• 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

Journal of the Korean Vacuum Society

• 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)

Journal of the Optical Society of Korea

• 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
• 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]

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• Correlation Between the Optical Performance of the Reflective Polarizer and the Structure of LCD Backlight (JOSK)
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