Lighting apparatus having low profile

Details Lighting apparatus having low profile Lighting apparatus having low profile

F - Mech Eng,Light,Heat,Weapons

21

V

F21V 8/00 (2006.01) G02F 1/13357 (2006.01) G04B 19/30 (2006.01)

Patent

CA 2274828

Disclosed is a low profile lighting apparatus (170) that is particularly advantageous for use as a backlight for illuminating a display. The lighting apparatus (170) includes a waveguide (172) coupled to a light source (180) for injecting light into the waveguide (170). The waveguide (170) includes a plurality of elongate structures for ejecting light propagating within the waveguide (170) through a predetermined surface of the waveguide. Another embodiment of the waveguide (426) includes a central region (74) of reduced thickness that redirects light propagating within the waveguide (426). The lighting apparatus (170) has a low profile so it is particularly useful in areas of limited space.

L'invention porte sur un appareil d'éclairage (170) extra-plat spécialement utilisé comme éclairage de fond d'un panneau. Ledit appareil (170) comporte un guide d'ondes (172) relié à une source lumineuse (180) dont la lumière est injectée dans le guide d'ondes (172). Le guide d'ondes (172) comporte une série de structures allongées éjectant la lumière se propageant dans le guide d'ondes (172) à travers une surface prédéterminée du guide d'ondes. Dans une variante, le guide d'ondes (426) comporte une zone centrale (74) d'épaisseur réduite qui redirige la lumière se propageant dans le guide d'ondes (426). L'appareil d'éclairage (170), qui est extra-plat, est particulièrement utile dans les zones où l'espace est limité.

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