Department of Mechanical and Automation Engineering, National Kaohsiung First University of Science and Technology, Taiwan. Instiute of Engineering Science and Technology, National Kaohsiung First University of Science and Technology, Taiwan.
This study proposes an innovative design method for functional optical film microstructures used in displays and applies this design to LCD backlighting to replace multi-layer optical film functional integration with composite optical film. We design a novel optical film microstructure based on light uniformity and wide-angle lumination distribution and determine the optimal optical microstructure parameters by combining the global optimization of a genetic algorithm with ray tracing. The purpose of this study is to develop substitutes for traditional multi-layer prism brightness enhancers and light-diffusing film stacks and to examine the structural changes during calculations and summarize the characteristics. In this study, we focus on determining the optimal light uniformity of new optical film microstructures. The seven-inch LED backlight module of the method proposed in this study achieved 94.59% uniformity and 168° lumination distribution while reducing thickness by 66% to 82% compared to a traditional multi-layer optical film stack.
Hsieh, C. and Li, Y. (2013) Optical Microstructure Design Optimization for Display Backlighting. Modern Mechanical Engineering, 3, 202-207. doi: 10.4236/mme.2013.34027.
[1] J. H. Holland, “Adaptive in Natural and Artificial Systems,” University of Michigan Press, Ann Arbor, 1975. [2] C. J. Li, Y. C. Fang and M. C. Cheng, “Study of Optimization of an LCD Light Guide Plate with Neural Network and Genetic Algorithm,” Optics Express, Vol. 17, No. 12, 2009, pp. 10177-10188.
http://dx.doi.org/10.1364/OE.17.010177 [3] N. Yamada and T. Nishikawa, “Evolutionary Algorithm for Optimization of Non-Imaging Fresnel Lens Geometry,” Optics Express, Vol. 18, No. S2, 2010, pp. A126-A132. http://dx.doi.org/10.1364/OE.18.00A126 [4] Y. H. Fan, Y. L. Liao, R. J. Chen, S. K. Chang and J. C. T. Hsieh, “Optimal Design of LED Backlight Unit with Double-Triangular Structure Using a Genetic Algorithm,” Fourth International Conference on Natural Computation, Jinan, 25-27 August 2008, pp. 625-629. [5] Y. S. Kim, A. S. Choi and J. W. Jeong, “Applying Micro Genetic Algorithm to Numerical Model for Luminous Intensity Distribution of Planar Prism LED Luminaire,” Optics Communications, Vol. 293, 2013, pp. 22-30.
http://dx.doi.org/10.1016/j.optcom.2012.11.017 [6] P. Y. Tsai, C. C. Hsieh and Y. H. Li, “Application of a Novel Focused Microlens to Light-Emitting Diode Packaging,” Journal of Micro/Nanolithography, MEMS, and MOEMS, Vol. 9, No. 3, 2010, Article ID: 033012.
http://dx.doi.org/10.1117/1.3487740 [7] C. C. Hsieh, P. Y. Tsai, Y. H. Li and C. W. Fan, “Investigation of the Influence of Structural Parameters of a Fresnel-Type Lens on the Narrowing of Light-Emitting Diode Light Beams,” Journal of Microlithography, Microfabrication, and Microsystem, Vol. 10, No. 3, 2011, pp. 1-9. [8] C. C. Hsieh, C. K. Yen and C. Y. Wang, “Composite Optical Film,” Patent M330483, 2008. [9] P. Downen, “A Closer Look at Flat-Panel-Display Measurement Standards and Trends,” Information Display, Vol. 22, 2006, pp. 16-21. [10] S. H. Baik, S. K. Hwang, Y. G. Kim, G. Park, J. H. Kwon, W. T. Moon, S. H. Kim, B. K. Kim and S. H. Kang, “Simulation and Fabrication of the Cone Sheet for LCD Backlight Application,” Journal of the Optical Society of Korea, Vol. 13, No. 4, 2009, pp. 478-483.
http://dx.doi.org/10.3807/JOSK.2009.13.4.478