Abstract

Laser diodes allow one to build a very thin, wide-gamut edge-lit backlight system for a direct-view liquid crystal display. An optical fiber is used to transfer its optical power into a light-guide. An ultrasound transmitter attached to the optical fiber is effective for reducing Speckle noise because the mechanical vibration introduced averages out the random interference patterns. In experiment, we built a backlight system with a green laser and evaluated Speckle noise by taking photographs under the conditions that mimicked human observation. The Speckle contrast intrinsic to the laser was reduced from 17% to 2% by turning on the ultrasound transmitter.

© 2009 IEEE

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2008 (2)

T. Murata, I. Fujieda, "Input couplers for thin light-guides and LEDs," Opt. Eng. 47, 027001 (2008).

K. Imai, I. Fujieda, "Illumination uniformity of an edge-lit backlight with viewing-angle control," Opt. Expr. 16, 11969-11974 (2008).

2007 (2)

K. Fujisawa, I. Onishi, Y. Fujiwara, "Edge-light backlight unit using optically patterned film," Jpn. J. Appl. Phys. 46, 194-199 (2007).

S. R. Park, O. J. Kwon, D. Shin, S.-H. Song, H.-S. Lee, H. Y. Choi, "Grating micro-dot patterned light guide plates for LED backlights," Opt. Express 15, 2888-2899 (2007).

1980 (1)

Appl. Opt. (1)

Jpn. J. Appl. Phys. (1)

K. Fujisawa, I. Onishi, Y. Fujiwara, "Edge-light backlight unit using optically patterned film," Jpn. J. Appl. Phys. 46, 194-199 (2007).

Opt. Eng. (1)

T. Murata, I. Fujieda, "Input couplers for thin light-guides and LEDs," Opt. Eng. 47, 027001 (2008).

Opt. Expr. (1)

K. Imai, I. Fujieda, "Illumination uniformity of an edge-lit backlight with viewing-angle control," Opt. Expr. 16, 11969-11974 (2008).

Opt. Express (1)

Other (11)

H. Suzuki, M. Higuchi, Y. Yang, "Twisted S-shaped light pipe for highly efficient coupling between LED and light guide in backlight system," of Tech. Papers, Soc. Inf. Display (2007) pp. 38-41.

Y. Ito, T. Tsukahara, S. Masuda, T. Yoshida, N. Nada, T. Igarashi, T. Kusunoki, J. Ohsako, "Optical design of phosphor sheet structure in LED backlight system," Dig. Tech. Papers, Soc. Inf. Display (2008) pp. 866-869.

G. Kurata, K. Sakurai, M. Ohira, Y. Kawabata, A. Funamoto, S. Aoyama, "Sheetless backlight system for mobile phone," Proc. 13th Int. Display Workshops (2006) pp. 1727-1730.

Y. Inaba, Y. Nagai, I. Fujieda, "Edge-lit backlight utilizing a laser diode and an optical fiber," Proc. 14th Int. Display Workshops (2007) pp. 705-708.

Y. Inaba, K. Imai, I. Fujieda, I. Onishi, "A backlight based on a laser diode and its design considerations," Dig. Tech. Papers, Soc. Inf. Display (2008) pp. 1564-1567.

M. Jansen, S. Brittain, G. Giaretta, J. Green, G. Niven, C. Stuart, W. Wu, "Large venue laser-based projectors," Proc. 14th Int. Display Workshops (2007) pp. 2353-2356.

A. Furukawa, N. Ohse, Y. Sato, D. Imanishi, K. Wakabayashi, S. Ito, K. Tamamura, S. Hirata, "Effective speckle reduction in laser projection displays," Proc. SPIE (2008) pp. 69110T.

M. Scholles, K. Frommhagen, C. Gerwig, J. Knobbe, H. Lakner, D. Schlebusch, M. Schwarzenberg, U. Vogel, "Recent advancements in system design for miniaturized MEMS-based laser projectors," Proc. SPIE (2008) pp. 69110U.

Y. M. Lee, D. U. Lee, J. M. Park, S. Y. Park, S. G. Lee, "A study on the relationships between human perception and the physical phenomenon of speckle," Dig. Tech. Papers, Soc. Inf. Display (2008) pp. 1347-1350.

A. Andreev, I. Kompanets, M. Minchenko, E. Pozhidaev, "Ferroelectric liquid crystal cell for speckle-noise suppression," Dig. Tech. Papers, Soc. Inf. Display (2008) pp. 2077-2088.

J. W. Goodman, Introduction to Fourier Optics (Robert, 2005) pp. 208-212.

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