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Optics Express

Optics Express

  • Vol. 16, Iss. 16 — Aug. 4, 2008
  • pp: 11969–11974

Illumination uniformity of an edge-lit backlight with emission angle control

Keita Imai and Ichiro Fujieda  »View Author Affiliations


Optics Express, Vol. 16, Issue 16, pp. 11969-11974 (2008)
http://dx.doi.org/10.1364/OE.16.011969


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Abstract

Viewing range of a liquid crystal display can be controlled by a liquid crystal device inserted between a light source and a light-guide of an edge-lit backlight unit. Here, we propose an output coupler with a vertical optical window through which light is extracted from a light-guide. Rays with large propagation angles and those with small angles have a comparable probability of hitting this window. As a result, a single set of these output couplers can provide uniform light extraction for both settings of a wide viewing range and a narrow one. Ray tracing simulations confirm these findings.

© 2008 Optical Society of America

OCIS Codes
(230.3720) Optical devices : Liquid-crystal devices
(220.2945) Optical design and fabrication : Illumination design

ToC Category:
Optical Design and Fabrication

History
Original Manuscript: June 12, 2008
Revised Manuscript: July 21, 2008
Manuscript Accepted: July 22, 2008
Published: July 25, 2008

Citation
Keita Imai and Ichiro Fujieda, "Illumination uniformity of an edge-lit backlight with emission angle control," Opt. Express 16, 11969-11974 (2008)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-16-16-11969


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References

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