FENG Qi-bin,LI De-hua,XIAO Hui-li,et al.Surface microstructure design of viewing angle deflection film based on extended light source[J].Optics and Precision Engineering,2021,29(06):1329-1336.
FENG Qi-bin,LI De-hua,XIAO Hui-li,et al.Surface microstructure design of viewing angle deflection film based on extended light source[J].Optics and Precision Engineering,2021,29(06):1329-1336. DOI: 10.37188/OPE.20212906.1329.
Surface microstructure design of viewing angle deflection film based on extended light source
To make a liquid crystal display used in the cockpit meet the special viewing angle requirements of the viewer, we designed a new type of optical film for deflecting the maximum brightness of the liquid crystal display from the frontal direction to a specific direction according to the position of the viewer. Using an extended light source, we propose a segment-weighted method for designing microstructures wherein the light from the different positions of the extended light source has different energy levels. The simulation results show that the horizontal viewing angle is unchanged, the vertical viewing angle is deflected by -15°, the light transmittance is 84.7%, and the half-brightness viewing angle range was (-38.4°, 4.4°). An actual sample was fabricated using a maskless direct-write lithography process, and an effect test was performed. The test results show that the maximum vertical brightness was deflected from 0° to -16° and the half-brightness viewing angle is changed from (-23.8°, 27.4°) to (-43°, 9.4°) compared with the traditional backlight viewing angle. The transmittance is 83.0%, which meets the requirements of deflected viewing angle and brightness.
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Related Institution
Key Laboratory of Special Display Technology of the Ministry of Education, National Engineering Laboratory of Special Display Technology, National Key Laboratory of Advanced Display Technology, Academy of Photoelectric Technology, Hefei University of Technology
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National Key Laboratory of Advanced Display Technology, National Engineering Laboratory of Special Display Technology, Key Laboratory of Special Display Technology of the Ministry of Education, Academy of Photoelectric Technology, Hefei University of Technology