Brightness enhancement article

G - Physics – 02 – B

Patent

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G02B 5/02 (2006.01) G02B 5/04 (2006.01)

Patent

CA 2288093

A brightness enhancement article that includes: (a) a transparent, flexible substrate; (b) a first major surface having an array of prisms with blunted or rounded peaks characterized by a chord whidth, cross-sectional pitch width, and radius of curvature in which the chord width is equal to about 20-40 % of the cross-sectional pitch width and the radius of curvature is equal to about 20-50 % of the cross-sectional pitch width; and (c) a second major surface characterized by a plurality of light scattering protrusions. The article has a haze value between about 20-60 % and a transmission value no greater than about 94 % when measured under conditions in which the first surface has a substantially planar topography.

Cette invention se rapporte à un article d'accentuation de la luminosité qui comporte (a) un substrat souple et transparent; (b) une première surface principale comportant un ensemble de prismes à pointes émoussées ou arrondies, caractérisées par des valeurs particulières de longueur de corde, de longueur d'écartement transversal et de rayon de courbure, la longueur de corde étant égale à 20-40 % environ de la longueur d'écartement transversal et le rayon de courbure étant égal à 20 à 50 % environ de la longueur d'écartement transversal; et (c) une seconde surface principale caractérisée par une pluralité de protubérances conçues pour la diffusion de la lumière. Cet article possède une valeur de trouble comprise approximativement entre 20 et 60 % et une valeur de transmission inférieure ou égale à 94 % lorsqu'on mesure ces valeurs dans des conditions telles que la première surface possède une topographie sensiblement plane.

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