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Proceedings Paper

Mobile display backlight light guide plates based on slanted grating arrays
Author(s): Jyrki Kimmel; Tapani Levola
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Paper Abstract

Modern mobile communication devices have user interfaces that are dominated by high-quality displays. Increased multimedia use imposes high demands on the design of display modules, as the content available for mobile use becomes visually richer. Especially the power dissipation of the display can limit the amount of time available for multimedia consumption and interaction. In the mobile liquid-crystal display (LCD), the energy efficiency is determined by the backlight design. State-of-the-art backlights direct white light through a display subpixel array, with high uniformity and up to 90 % efficiency in white light output. Diffractive backlights have recently been proposed to reduce the power dissipation of the display module, and slanted grating arrays are among the enabling optical features that allow for reduction in power dissipation beyond what is available in the state of the art. By the use of diffractive grating arrays, the required primary color (red, green, or blue) is directed through the LCD subpixel array with geometrical registration, instead of flooding the whole LCD with white light and filtering the primary colors through the subpixel color filter array. This paper presents a study on grating structures based on slanted grating arrays fabricated in high refractive index materials. The grating design and grating outcoupling results are provided, and an outline of a new embedded system design is given. Emphasis is on grating array design aspects for future display system design. The results show that savings in power consumption can be expected with advanced display system design based on embedded slanted grating array backlight light guide plates.

Paper Details

Date Published: 20 April 2011
PDF: 9 pages
Proc. SPIE 8065, SPIE Eco-Photonics 2011: Sustainable Design, Manufacturing, and Engineering Workforce Education for a Green Future, 806518 (20 April 2011); doi: 10.1117/12.882924
Show Author Affiliations
Jyrki Kimmel, Nokia Research Ctr. (Finland)
Tapani Levola, Nokia Research Ctr. (Finland)

Published in SPIE Proceedings Vol. 8065:
SPIE Eco-Photonics 2011: Sustainable Design, Manufacturing, and Engineering Workforce Education for a Green Future
Pierre Ambs; Dan Curticapean; Claus Emmelmann; Wolfgang Knapp; Zbigniew T. Kuznicki; Patrick P. Meyrueis, Editor(s)

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