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Proceedings Paper

A directional backlight covered with pixelated nano-grating arrays
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Paper 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.

Paper Details

Date Published: 2 November 2018
PDF: 6 pages
Proc. SPIE 10818, Holography, Diffractive Optics, and Applications VIII, 108180K (2 November 2018); doi: 10.1117/12.2500551
Show Author Affiliations
Yunli Zhang, Soochow Univ. (China)
Erkai Hua, Soochow Univ. (China)
Xiumei Wu, Soochow Univ. (China)
Feng Zhou, Soochow Univ. (China)
Jiacheng Shi, Soochow Univ. (China)
Linsen Chen, Soochow Univ. (China)
Wen Qiao, Soochow Univ. (China)


Published in SPIE Proceedings Vol. 10818:
Holography, Diffractive Optics, and Applications VIII
Yunlong Sheng; Chongxiu Yu; Changhe Zhou, Editor(s)

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