P‐77: Some Requirements on LED Characteristics for LCD TV Applications | Zendy

Wang ChihLin | Zendy; Yao YuanJung | Zendy; Lin RueiTeng | Zendy; Chen MingLun | Zendy; Su ShengLung | Zendy

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P‐77: Some Requirements on LED Characteristics for LCD TV Applications

Author(s) -

Wang ChihLin,

Yao YuanJung,

Lin RueiTeng,

Chen MingLun,

Su ShengLung

Publication year - 2010

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 - 10.1889/1.3500003

Subject(s) - backlight , light emitting diode , materials science , optics , liquid crystal display , lens (geology) , optoelectronics , led display , engineering , physics , electrical engineering

LED lens for chip‐on‐board LED with suitable beam pattern has been designed and fabricated for direct‐lit backlight unit (BLU). Side‐emitting beam pattern with peaks at ±60–70° shows larger value by the definition of point spread function compared with those of PLCC type LEDs. LED color shift criteria Δ y less than 0.03 and central intensity less than 40% for BLU cosmetic requirement were determined. By means of this approach, thickness of backlight unit for light mixing can be reduced to 8 mm without sacrifice of the optical performance; uniformity performance of 87.8 % was obtained.

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