Optical waveguides – Planar optical waveguide
Reexamination Certificate
2008-07-01
2008-07-01
Connelly-Cushwa, M. R. (Department: 2874)
Optical waveguides
Planar optical waveguide
C385S014000, C385S901000, C349S058000, C349S060000, C349S065000, C349S067000
Reexamination Certificate
active
11211480
ABSTRACT:
A backlight unit is disposed at a lower side of a liquid-crystal display module LCD, and has a case that accommodates a fluorescent tube, as a light source for light incident to the liquid-crystal display module, a lamp reflector that accommodates the fluorescent tube, and an optical waveguide having an approximately square shape in the surface that converts linear light generated by the fluorescent tube and light of the linear light reflected from the lamp reflector into planar light, and inputs the planar light to the liquid-crystal display module. The lamp reflector is made of metal, and has stoppers provided at first parts facing both ends of a side surface of the optical waveguide opposite to the fluorescent tube, at positions closer to the optical waveguide than to a second part facing the side surface of the optical waveguide excluding the first parts. With this arrangement, it is possible to provide a backlight unit of a liquid-crystal display device that can prevent the fluorescent tube from being damaged even when the optical waveguide drops due to shock or the like.
REFERENCES:
patent: 5280372 (1994-01-01), Horiuchi
patent: 5815227 (1998-09-01), Lee
patent: 6443583 (2002-09-01), Ha
patent: 7092048 (2006-08-01), Jeong
patent: 2002/0093603 (2002-07-01), Chen
patent: 2002/0101550 (2002-08-01), Yeh
patent: 7-261173 (1995-10-01), None
patent: 2001-66591 (2001-03-01), None
patent: 2000-37845 (2000-07-01), None
patent: 2004-5169 (2004-01-01), None
Korean Patent Office Action, dated Oct. 31, 2006, and issued in corresponding Korean Patent Application No. 10-2005-0082997.
Chinese Patent Office Action, mailed Jul. 27, 2007 and issued in corresponding Chinese Patent Application No. 2005101030912.
Connelly-Cushwa M. R.
Fujitsu Limited
Staas & Halsey , LLP
LandOfFree
Backlight unit of liquid-crystal display module does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Backlight unit of liquid-crystal display module, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Backlight unit of liquid-crystal display module will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3936999