Display brightness enhancement film

G - Physics – 02 – F

Patent

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G02F 1/1335 (2006.01) G02B 5/30 (2006.01)

Patent

CA 2247625

An optical film is provided which comprises a disperse phase of polymeric particles disposed within a continuous birefringent matrix in combination with light directing materials to enable control of light emitted from a lighting fixture or display. The film is oriented, typically by stretching, in one or more directions. The size and shape of the disperse phase particles, the volume fraction of the disperse phase, the film thickness, and the amount of orientation are chosen to attain a desired degree of diffuse reflection and total transmission of electromagnetic radiation of a desired wavelength in the resulting film, and the light directing materials are chosen to control the direction of polarized light reflected from or transmitted by the optical film.

L'invention concerne un film optique comprenant une phase dispersée de particules polymères disposées dans une matrice continue biréfringente en combinaison avec des matières capables de diriger la lumière, afin de contrôler la lumière émise d'une système lumineux ou d'un affichage lumineux. Le film est orienté, typiquement par étirage, dans un plusieurs directions. La taille et la forme des particules de phase dispersée, la fraction volumique de la phase dispersée, l'épaisseur du film et la quantité d'orientation sont choisies pour assurer au film résultant le degré souhaité de réflexion diffuse et de transmission totale de la radiation électromagnétique ayant la longueur d'onde souhaitée et les matières pour diriger la lumière sont choisies pour contrôler la direction de la lumière polarisée réfléchie par le film optique ou transmise par celui-ci.

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