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Grating micro-dot patterned light guide plates for LED backlights
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DOI：10.1364/OE.15.002888.png)
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摘要
En 中文
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 similar to 62% intensity uniformity within similar to 8 degrees and 20 degrees luminance angles in two main directions. (c) 2007 Optical Society of America.
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