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Proceedings Paper

Novel diffraction grating light guide for LED backlight
Author(s): Eri Miyamoto; Shingo Maruyama; Akira Nagano; Luis M. Murillo-Mora; Toshiki Toda; Fujio Iwata
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Paper Abstract

In conventional LED backlight as that used in mobile liquid crystal displays (LCDs), typically the structure consists of a light guide, a diffusing sheet, prism sheets and so on. In this work we would like to propose a novel light guide where we have applied a special diffraction grating technology which provides a high performance with a thinner backlight. The special designed diffraction gratings on the light guide redirects incident light by diffraction to the front direction without the utilization of prism sheets. For testing the performance we made a diffraction grating light guide suited for a 2.4 inch backlight with 4 LEDs in a trial. As a result, the backlight that consisted of a diffraction grating light guide, with either a single or none prism sheet achieved equivalent performance to conventional backlights.

Paper Details

Date Published: 20 February 2007
PDF: 8 pages
Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880H (20 February 2007); doi: 10.1117/12.700107
Show Author Affiliations
Eri Miyamoto, Toppan Printing Co., Ltd. (Japan)
Shingo Maruyama, Toppan Printing Co., Ltd. (Japan)
Akira Nagano, Toppan Printing Co., Ltd. (Japan)
Luis M. Murillo-Mora, Toppan Printing Co., Ltd. (Japan)
Toshiki Toda, Toppan Printing Co., Ltd. (Japan)
Fujio Iwata, Toppan Printing Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 6488:
Practical Holography XXI: Materials and Applications
Roger A. Lessard; Hans I. Bjelkhagen, Editor(s)

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