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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)

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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

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

Adrian Travis, Tim Large, Neil Emerton, and Steven Bathiche, "Collimated light from a waveguide for a display backlight," Opt. Express 17, 19714-19719 (2009)

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  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).
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  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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