Grating micro-dot patterned light guide plates for LED backlights

A novel LED backlight unit implementing a light guide plate (LGP) with a two-dimensional array of grating micro-dots is proposed. By optimizing grating-vector orientations of local gratings and applying suitable grating-depth modulation in the array, taking into consideration of the radiation patter...

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Bibliographic Details
Published in:Optics express 2007-03, Vol.15 (6), p.2888-2899
Main Authors: Park, Seung Ryong, Kwon, Oh Jang, Shin, Dongho, Song, Seok-Ho, Lee, Hong-Seok, Choi, Hwan Young
Format: Article
Language:English
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Summary:A novel LED backlight unit implementing a light guide plate (LGP) with a two-dimensional array of grating micro-dots is proposed. By optimizing grating-vector orientations of local gratings and applying suitable grating-depth modulation in the array, taking into consideration of the radiation pattern of the LED source, uniform out-coupled light distribution within a narrow luminance angle was achieved without recognizable hot spots. Such a light guide plate was fabricated using a dot-matrix holographic interferometer setup and a UV embossing replication. Fabricated polycarbonate LGP showed ~62% intensity uniformity within ~8 degrees and ~20 degrees luminance angles in two main directions.
ISSN:1094-4087
1094-4087
DOI:10.1364/oe.15.002888