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Optical Engineering • Open Access

Backlight units based on light extraction from a curved optical fiber
Author(s): Ichiro Fujieda; Kazuma Arizono; Kazuki Nishida; Naoki Takigawa

Paper Abstract

A backlight unit is constructed by laying out a plastic optical fiber (POF) in a curved trench fabricated in a light-guide plate. First, the light leaks out of the POF at curved sections and enters the plate. Next, the light is extracted from the plate by some microstructures fabricated on the surfaces of the plate. Coupled to a laser diode, its optical power can be efficiently and uniformly delivered over a large area via the POF. In this experiment, we fabricated a 10  cm×10  cm×3  mm prototype unit with off-the-shelf components. It becomes see-through when the space around the POF is filled with index-matching oil. One can build an arbitrary-shaped planar light source by tiling multiple cells and connecting them by a POF. The light inside the POF is depleted as it propagates downstream. This can be compensated by decreasing the radii of curvature. Microstructures on the light-guide plate can distort the passage of ambient light. For a see-through unit, we can distribute them sparsely and/or use absorbers. A see-through backlight unit is a relatively unexplored device, and it might pave the way for new applications.

Paper Details

Date Published: 24 June 2014
PDF: 8 pages
Opt. Eng. 53(6) 065104 doi: 10.1117/1.OE.53.6.065104
Published in: Optical Engineering Volume 53, Issue 6
Show Author Affiliations
Ichiro Fujieda, Ritsumeikan Univ. (Japan)
Kazuma Arizono, Ritsumeikan Univ. (Japan)
Kazuki Nishida, Ritsumeikan Univ. (Japan)
Naoki Takigawa, Ritsumeikan Univ. (Japan)

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