High-efficiecy optical element for led display backlight systems
E. Aslanov, L.L. Doskolovich, M.A. Moiseev

PDF, 640 kB

Full text of article: Russian language.

DOI: 10.18287/0134-2452-2013-37-2-215-219

Pages: 215-219.

New design of refractive optical element for display backlight systems is presented. The presented design can be used instead of linear light sources (like electroluminescent lamp with cold cathode). It is intended for uniform illumination of two line segments on the diffuse reflector. The problem of computation of optical surface is reduced to integration of a set of two explicit first-order differential equations. Simulation data for backlight unit containing matrix of designed optical elements demonstrates uniform illumination of rectangular area at the distance of 12-16 mm for LED sources. Light efficiency of the presented optical system is more than 94 %.

Key words:
optical element, light-emitting diode, nonimaging optics, backlight system.


  1. Lin, Ch. Optimized microprism diffusion film for slim-type bottom-lit backlight units / Ch. Lin, Yu. Fang, P. Yang // J. of Display Technology – 2011. – Vol. 7(1). – P. 3-9.
  2. Doshi, M. Low frequency architecture for multi-lamp CCFL systems with capacitive ignition / M. Doshi, R. Zane, F.J. Azondo// J. of Display Technology – 2009. – Vol. 5(5). – P. 152-161.
  3. Chang, R.-S. LED Backlight Module by Lightguide-Diffusive Component / R. Chang, J. Tsai, T. Li, H. Liao // J. of Display Technology – 2012. – Vol. 8(2). – P. 79-86.
  4. http://www.labsphere.com/products/reflectance-standards-and-targets/reflectance-targets/spectralon-targets.aspx
  5. Bhandari, A. Bidirectional reflectance distribution function of Spectralon white reflectance standard illuminated by incoherent unpolarized and plane-polarized light / A. Bhan­dari, B. Hamre, O. Frette, L. Zhao, K.J. Stamnes, M. Kil­demo// Applied Optics. – 2011. – Vol. 50(16). – P. 2431-2442.
  6. Soifer, V. Iterative Methods for Diffractive Optical Elements Computation / V. Soifer, V. Kotlyar, L. Doskolovich. – London: Taylor&Francis Ltd., 1997. – 244 p.
  7. Doskolovich, L.L. Analysis of quasiperiodic and geometric optical solutions of the problem of focusing into an axial segment / L.L. Doskolovich, N.L. Kazanskiy, V.A. Soifer, A.Ye. Tzaregorodtzev // Optik. – 1995. – Vol. 101(2). – P. 37-41.
  8. Doskolovich, L.L. Design of TIR optics generating prescribed irradiance distribution in the circle region / L.L. Doskolovich, M.A. Moiseev // J. Opt. Soc. Am. A – 2012. – Vol. 29(9). – P. 1758-1763.
  9. http://www.mathworks.com/
  10. http://lambdares.com/software_products/tracepro/
  11. Whang, A. Designing Uniform Illumination Systems by Surface-Tailored Lens and Con?gurations of LED Arrays / A. Whang, Yi. Chen, Yu. Teng // J. of Display Technology – 2009. – Vol. 5(3). – P. 94-103.

© 2009, IPSI RAS
Institution of Russian Academy of Sciences, Image Processing Systems Institute of RAS, Russia, 443001, Samara, Molodogvardeyskaya Street 151; e-mail: ko@smr.ru; Phones: +7 (846 2) 332-56-22, Fax: +7 (846 2) 332-56-20