A directional backlight covered with pixelated nano-grating arrays

Yunli Zhang; Erkai Hua; Xiumei Wu; Feng Zhou; Jiacheng Shi; Linsen Chen; Wen Qiao

doi:10.1117/12.2500551

2 November 2018 A directional backlight covered with pixelated nano-grating arrays

Yunli Zhang, Erkai Hua, Xiumei Wu, Feng Zhou, Jiacheng Shi, Linsen Chen, Wen Qiao

Proceedings Volume 10818, Holography, Diffractive Optics, and Applications VIII; 108180K (2018) https://doi.org/10.1117/12.2500551
Event: SPIE/COS Photonics Asia, 2018, Beijing, China

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.

Citation Download Citation

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

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available