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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 22 — Oct. 26, 2009
  • pp: 19714–19719

Collimated light from a waveguide for a display backlight

Adrian Travis, Tim Large, Neil Emerton, and Steven Bathiche  »View Author Affiliations


Optics Express, Vol. 17, Issue 22, pp. 19714-19719 (2009)
http://dx.doi.org/10.1364/OE.17.019714


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Abstract

We report light collimation from a point source without the space normally needed for fan-out. Rays emerge uniformly from all parts of the surface of a blunt wedge light-guide when a point source of light is placed at the thin end and the source’s position determines ray direction in the manner of a lens. A lenticular array between this light-guide and a liquid crystal panel guides light from color light-emitting diodes to designated sub-pixels thereby removing the need for color filters and halving power consumption but we foresee much greater power economies and wider application.

© 2009 OSA

OCIS Codes
(080.3630) Geometric optics : Lenses
(230.7390) Optical devices : Waveguides, planar
(110.2945) Imaging systems : Illumination design
(080.4298) Geometric optics : Nonimaging optics

History
Original Manuscript: September 9, 2009
Revised Manuscript: October 9, 2009
Manuscript Accepted: October 9, 2009
Published: October 15, 2009

Citation
Adrian Travis, Tim Large, Neil Emerton, and Steven Bathiche, "Collimated light from a waveguide for a display backlight," Opt. Express 17, 19714-19719 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-22-19714


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References

  1. A. Travis, F. Payne, J. Zhong, and J. Moore, “Flat panel display using projection within a wedge-shaped waveguide,” presented at the 20th International Display Research Conference of the Society for Information Display, 292–295 (2002).
  2. S. Kobayashi, S. Mikoshiba, and S. Lim, LCD Backlights (John Wiley & Sons, 2009).
  3. M. Anandan, “Progress of LED backlights for LCDs,” J. Soc. Inf. Disp. 16(2), 287–310 (2008). [CrossRef]
  4. C.-C. Sun, I. Moreno, S.-H. Chung, W.-T. Chien, C.-T. Hsieh, and T.-H. Yang, “Brightness management in a direct LED backlight for LCD TVs,” J. Soc. Inf. Disp. 16(4), 519–526 (2008). [CrossRef]
  5. M. Albrecht, A. Karrenbauer, and C. Xu, “A Clipper-Free Algorithm for Efficient HW-Implementation of Local Dimming LED-Backlight,” presented at the 28th International Display Research Conference of the Society for Information Display, 286–289 (2008), http://www.sidmembers.org/proc/IDRC2008/redist/docs/15_3.pdf
  6. R. Hoskinson and B. Stoeber, “High-dynamic range image projection using an auxiliary MEMS mirror array,” Opt. Express 16(10), 7361–7368 (2008), http://www.opticsinfobase.org/oe/viewmedia.cfm?URI=oe-16-10-7361&seq=0 . [CrossRef] [PubMed]
  7. K. Sekiya, “Design Scheme of LED Scanning Backlights for Field-Sequential-Color LCDs,” SID Symposium Digest of Technical Papers, 47(2), 1026–1029 (2009).
  8. J. Kimmel, T. Levola, A. Giraldo, N. Bergeron, S. Siitonen, and T. Rytkönen, “Diffractive Backlight Light Guide Plates in Mobile Electrowetting Display Applications,” SID Symposium Digest of Technical Papers, 47(2), 826–829 (2009).

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