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2 November 2018 A directional backlight covered with pixelated nano-grating arrays
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Abstract
Directional backlight has lots of potential applications, including dual view display, anti-spy display, and 3D display. The traditional backlight module illuminates the LCD panel with an angular divergence of around ±60°, while the required angular divergence of directional backlight for anti-spy display is less than ±30°. In this paper, the proposed backlight module is consisted of a LED linear array, a coupling prism and a backlight plate. The wavelength of the gratings are such designed that the angular divergence of the emitting light from the backlight module is limited within ±6.6°. Furthermore, the depth of the gratings is well tuned over the backlight plate so that the diffraction efficiency of the nano-gratings increases as the distance from the LED light sources increases. As a result, a uniform illumination can be achieved over an area of 5.5-inch.
© (2018) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yunli Zhang, Erkai Hua, Xiumei Wu, Feng Zhou, Jiacheng Shi, Linsen Chen, and Wen Qiao "A directional backlight covered with pixelated nano-grating arrays", Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 108180K (2 November 2018); https://doi.org/10.1117/12.2500551
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