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P‐121: Enhancement of Brightness and Uniformity by LED Backlight Using a Total Internal Reflection (TIR) Lens
Author(s) -
Hwang Jang Hwan,
Shin Dong Myoung,
Gong Doo Won,
Park Chang Wook,
Kang Won Il,
Seo Ji Hoon,
Kim Young Kwan,
Hyung Gun Woo
Publication year - 2008
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3069483
Subject(s) - backlight , brightness , optics , total internal reflection , reflection (computer programming) , light guide , light emitting diode , lens (geology) , light reflection , led display , materials science , optoelectronics , light source , physics , liquid crystal display , computer science , engineering , electrical engineering , programming language
The backlight in this paper comprises a total internal reflection (TIR) lens, main light guide, LEDs, and optical films. We gained 40% brightness enhancement and 83% uniformity benefit with the backlight using TIR compared with the conventional backlight. It was found that TIR lens internally reflects the light on each TIR surface twice instead of lighting out directly and the brightness and the uniformity are improved. with this backlight using TIR lens, the bright‐line which was present in the conventional backlight was also disappeared by TIR effect occurred on the each reflection surface.