Prismatic refracting optical array for liquid flat panel...

G - Physics – 02 – F

Patent

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G02F 1/133 (2006.01) F21V 5/02 (2006.01)

Patent

CA 2204607

A prismatic refracting array for a flat panel liquid crystal display (LCD) backlighting device matches a prismatic angle with the critical angle of the exit window and surrounding material, e.g., glass and air. By selecting the prism angle of the refracting array with reference to the critical angle of the exit window and surrounding air, light lost to total internal reflectance within the exit window is substantially eliminated while directing all light output within selected view angles. By better utilizing the available light output from the flat panel backlight device, overall efficiency of the LCD device is improved.

Ensemble prismatique réfringent pour panneau lumineux plat d'affichage à cristaux liquides permettant d'adapter l'angle prismatique à l'angle critique de la fenêtre de sortie et des matériaux environnants (par exemple, verre et air). En choisissant l'angle prismatique de l'ensemble réfringent en fonction de l'angle critique de la lucarne de sortie et de l'air ambiant, il est possible d'éliminer sensiblement la lumière perdue par rapport à la réflectance interne totale dans la lucarne de sortie et d'orienter toute la lumière émise selon les angles de vision voulus. Le fait de mieux utiliser la lumière émise par le panneau lumineux plat permet d'améliorer globalement l'efficacité du dispositif d'affichage à cristaux liquides.

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