Illumination apparatus for display device using...

Details Illumination apparatus for display device using... Illumination apparatus for display device using...

2005-12-14

2010-12-28

Chang, Audrey Y (Department: 2872)

Optical: systems and elements

Holographic system or element

With optical waveguide

C359S015000, C362S600000, C362S621000, C385S146000, C385S147000

Reexamination Certificate

active

07859731

ABSTRACT:
An illumination apparatus and method for a display device designed such that light is incident on a hologram or hologram pattern at an angle for which diffraction efficiency is the highest. The illumination apparatus includes at least one point light source which emits light and a light guide plate (LGP) which has the at least one point light source disposed on a side thereof and a hologram pattern on a top surface which permits the light incident from the point light source to exit from the top surface. The side of the LGP facing the point light source is inclined such that the light is incident obliquely on the hologram pattern at an altitude angle which provides high diffraction efficiency.

REFERENCES:
patent: 5359691 (1994-10-01), Tai et al.
patent: 5669693 (1997-09-01), Smith
patent: 6480307 (2002-11-01), Yang
patent: 6733147 (2004-05-01), Wang et al.
patent: 7220043 (2007-05-01), Cha et al.
patent: 2004/0141104 (2004-07-01), Yu et al.
patent: 2003-0038294 (2003-05-01), None

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