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http://dx.doi.org/10.5757/JKVS.2007.16.6.424

Luminance Normalization of Optical Sheets in a Backlight Unit for LCD-TVs  

Jeong, Jong-Mun (Dept. of Electrophysics, Kwangwoon University)
Kim, Jung-Hyun (Dept. of Electrophysics, Kwangwoon University)
Shin, Myeong-Ju (Dept. of Electrophysics, Kwangwoon University)
Lee, Mi-Ran (Dept. of Electrophysics, Kwangwoon University)
Chung, Jae-Yoon (Dept. of Electrophysics, Kwangwoon University)
Jeong, Hee-Suk (Korea Institute of Lighting Technology)
Kim, Jin-Sheon (Korea Institute of Lighting Technology)
Hong, Byeong-Hee (Dept. of Electrophysics, Kwangwoon University)
Kang, June-Gill (Dept. of Electrophysics, Kwangwoon University)
Cho, Guang-Sup (Dept. of Electrophysics, Kwangwoon University)
Publication Information
Journal of the Korean Vacuum Society / v.16, no.6, 2007 , pp. 424-432 More about this Journal
Abstract
Luminance properties of external electrode fluorescent lamps and optical components in backlight unit (BLU) and optical transmission rates of optical sheets, are investigated for LCD-TV of 32" in diagonal with WXGA level resolution (1366$\times$768). The luminance is measured in 12-lamps and 18-lamps of BLU. The luminance uniformity preserves about 85 % in the 12-lamps backlight, while the luminance of optical components and the efficiency of backlight in the 12-lamps are lower than those in the 18-lamps backlight. When the lamp luminance in BLU having 12-lamps and 18-lamps is normalized as 100 %, the relative luminance of a diffusion plate, a diffusion sheet, a prism sheet (BEF), a polarization sheet (DBEF), has a constant value without dependence on a lamp luminance. The relative luminance of optical components in 12-lamps BLU is lower than that in 18-lamps backlight. The light transmission rate, the relative luminance of liquid crystal display panel with the luminance 100 % of backlight, is 7.14 % in the use of DBEF and BEF, 6.12 % in the use of only DBEF, and 3.21 % in the use of only BEF. Those Data obtained in this experiment for the lamps and optical components, are the design parameters for the LCD backlight.
Keywords
LCD; Backlight; EEFL(External Electrode Fluorescent Lamp); Optical sheet; Luminance;
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