Low profile backlight apparatus

Details Low profile backlight apparatus Low profile backlight apparatus

2008-01-18

2010-10-05

Nelms, David (Department: 2871)

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

C349S061000, C349S062000, C349S066000, C349S067000

Reexamination Certificate

active

07808581

ABSTRACT:
A backlight apparatus includes a point source of radiant electromagnetic energy. A total internal reflection (TIR) lens has a vertical central axis located along a path of the radiant electromagnetic energy. The TIR lens receives and evenly distributes the radiant electromagnetic energy at an output face. The radiant electromagnetic energy exiting the TIR lens is substantially collimated and defines vertical optical paths parallel to the vertical central axis. A first diffuser receives the radiant electromagnetic energy from the output face of the TIR lens and spreads the radiant electromagnetic energy to a predetermined first angle relative to the vertical optical paths.

REFERENCES:
patent: 5369350 (1994-11-01), Matsuda
patent: 5404869 (1995-04-01), Parkyn et al.
patent: 5577493 (1996-11-01), Parkyn, Jr. et al.
patent: 5655832 (1997-08-01), Pelka et al.
patent: 5691788 (1997-11-01), Kim
patent: 5986728 (1999-11-01), Bernard
patent: 6007209 (1999-12-01), Pelka
patent: 6134092 (2000-10-01), Pelka et al.
patent: 2004/0252255 (2004-12-01), Folkerts
patent: 2006/0227545 (2006-10-01), Mok et al.
patent: 2007/0091613 (2007-04-01), Lee et al.
patent: 0 893 727 (1999-01-01), None
patent: 1 155 351 (2001-11-01), None
patent: 1 486 818 (2004-12-01), None
patent: 60 140322 (1985-07-01), None
patent: 2002 352611 (2002-12-01), None
patent: WO 2007/017833 (2007-02-01), None
patent: WO 2007/050274 (2007-05-01), None
International Search Report in Application No. PCT/US09/030831 dated Apr. 9, 2009.
Written Opinion of the International Searching Authority in Application No. PCT/US09/030831 dated Apr. 9, 2009.
Pelka, et al., “An Overview of LED Applications for General Illumination”, (Conference Proceedings Paper), SPIE vol. 5816, Nov. 2003.
Pelka, et al., Keen Forms of Kinoforms—Kinoform-based Diffusers Help Lighting Designers Leverage Unique LED Advantages, OE Magazine, vol. 3 No. 10, p. 19, Oct. 2003.

Affiliated with

Also associated with

Rating

Low profile backlight apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low profile backlight apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low profile backlight apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4239453