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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Editor: Franco Gori
  • Vol. 27, Iss. 9 — Sep. 1, 2010
  • pp: 2015–2020

Method of determination of light-scatterer distribution in edge-lit backlight units using an analytical approach

Mihai Kusko, Cristian Kusko, and Dana Cristea  »View Author Affiliations

JOSA A, Vol. 27, Issue 9, pp. 2015-2020 (2010)

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We present a method to find the optimum distribution of scatterers in an edge-lit lightguide plate (LGP) for rendering a uniform distribution of the outcoupled light. We propose a simple mathematical model describing the light propagation in a waveguide with a distribution of scattering elements located on the lower surface of the waveguide. We have found a differential equation giving the distribution of scattering elements leading to a uniform irradiance along the LGP, and we propose a method to determine the value of the outcoupling coefficient of an individual scattering element from the irradiance (or radiance) measurements. We have verified the validity of this model by performing ray tracing simulations on an LGP with the scattering elements distributed according to the solution of the proposed differential equation, and we have found a quantitative agreement between the analytical results and the simulated ones. Also this model has been used to directly calculate the output power of a given embossed LGP.

© 2010 Optical Society of America

OCIS Codes
(120.2040) Instrumentation, measurement, and metrology : Displays
(220.2740) Optical design and fabrication : Geometric optical design
(220.4830) Optical design and fabrication : Systems design
(080.3685) Geometric optics : Lightpipes

Original Manuscript: May 28, 2010
Manuscript Accepted: July 5, 2010
Published: August 18, 2010

Mihai Kusko, Cristian Kusko, and Dana Cristea, "Method of determination of light-scatterer distribution in edge-lit backlight units using an analytical approach," J. Opt. Soc. Am. A 27, 2015-2020 (2010)

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