Novel diffraction grating light guide for LED backlight

Eri Miyamoto; Shingo Maruyama; Akira Nagano; Luis M. Murillo-Mora; Toshiki Toda; Fujio Iwata

doi:10.1117/12.700107

20 February 2007 Novel diffraction grating light guide for LED backlight

Eri Miyamoto, Shingo Maruyama, Akira Nagano, Luis M. Murillo-Mora, Toshiki Toda, Fujio Iwata

Proceedings Volume 6488, Practical Holography XXI: Materials and Applications; 64880H (2007) https://doi.org/10.1117/12.700107
Event: Integrated Optoelectronic Devices 2007, 2007, San Jose, California, United States

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.

Citation Download Citation

Eri Miyamoto, Shingo Maruyama, Akira Nagano, Luis M. Murillo-Mora, Toshiki Toda, and Fujio Iwata "Novel diffraction grating light guide for LED backlight", Proc. SPIE 6488, Practical Holography XXI: Materials and Applications, 64880H (20 February 2007); https://doi.org/10.1117/12.700107

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