Backlight assembly for an electro-optical display

G - Physics – 02 – F

Patent

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G02F 1/1335 (2006.01) G02F 1/13357 (2006.01)

Patent

CA 2175371

An improved backlight assembly (2) com- prising an array of apertures (8) in close proxim- ity to a light source (6), an array of tapered opti- cal elements (10) that have a light input surface area smaller than the light output surface area. Light rays pass through the apertures and are directed to the optical elements which transmit the light rays via internal reflection to provide a partially collimated light source. The light rays then pass through an array of microlenses (12) that transmit the light rays via refraction and pro- vide a substantially more collimated light source for the display elements of a display (16). The backlight assembly is advantageously used as a backlighting means for electro-optical displays, especially those designed for military and avion- ics applications.

Système d'éclairage par l'arrière (2) comportant un réseau d'ouvertures (8) placé à proximité immédiate d'une source lumineuse (6) et un réseau d'éléments optiques coniques (10) dont la surface de pénétration de la lumière est inférieure à celle de sortie de la lumière. Les rayons lumineux traversent les ouvertures puis sont dirigés sur les éléments optiques, qui les transmettent par réflexion interne de façon à produire une source lumineuse partiellement collimatée. Les rayons lumineux traversent ensuite un réseau de microlentilles (12), qui les transmettent par réfraction de façon à produire une source de lumière sensiblement plus collimatée pour les éléments d'affichage de l'écran (16). Ledit système d'éclairage par l'arrière offre des avantages en matière d'affichages électro-optiques et en particulier pour ce qui est des applications militaires et avioniques.

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