Backlight unit for flat panel display and flat panel display...

Illumination – Edge lighted panel – Light guide

Reexamination Certificate

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Details

C362S606000, C362S617000, C362S620000, C362S623000, C362S625000, C362S626000, C362S628000, C362S629000

Reexamination Certificate

active

07364340

ABSTRACT:
A backlight unit for a flat panel display and a flat panel display apparatus having the same. The backlight unit for a flat panel display displaying a predetermined image includes: a light source which emits light; a light guide panel having an incident surface facing the light source and which totally reflects light incident through the incident surface toward the flat panel display; and a holographic pattern that includes a plurality of diffraction gratings that are continuously repeated on at least one of an exit surface of the light guide panel and the opposing surface and diffracts light incident into the light guide panel. A depth of the diffraction grating progressively increases away from the incident surface along a length direction of the light guide panel. The backlight unit for a flat panel display and the flat panel display apparatus having the same have a simple structure that can acquire surface light using a holographic pattern while achieving uniform brightness distribution across the entire light-emitting surface.

REFERENCES:
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patent: 7044628 (2006-05-01), Choi et al.
patent: 2004/0246743 (2004-12-01), Lee et al.
patent: 2005/0002174 (2005-01-01), Min et al.
patent: 1016817 (2000-07-01), None
Moharam M G et al: “Stable Implementation of the Rigorous Coupled-Wave Analysis for Surface-Relief Gratings: Enhanced Transmittance Matrix Approach”, Journal of the Optical Society of America, Washington, U.S., vol. 12, No. 5, May 1995 pp. 1077-1086, ISSN: 1084-7529.
Viswanathan N K et al: “Surface relief structures on azo polymer films”, Journal of Materials Chemistry, The Royal Society of Chemistry, Cambridge, GB, vol. 9, 1999, pp. 1941-1955, ISSN: 0959-9428.
Min J H et al: “Holographic backlight unit for mobile LCD devices”, Journal of the Society for Information Display Soc. Inf. Display USA, vol. 11, No. 4, 2003, pp. 653-657, ISSN: 1071-0922.

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