Brightness enhancement film for backlit image displays

G - Physics – 02 – F

Patent

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Details

G02F 1/1335 (2006.01) G09F 9/35 (2006.01) G09F 13/08 (2006.01)

Patent

CA 2543513

A brightness enhancement film (22A) having a monolayer of approximately hemispherical, transparent, closely packed larger diameter hemi-beads (24). Due to the hemi-beads' hemispherical shape, gaps (26) remain between adjacent ones of the larger diameter hemi-beads. A substantial number of the gaps are provided with at least one approximately hemispherical, transparent hemi-bead (28) having a diameter substantially less than the diameter of the larger diameter hemi-beads. Provision of smaller diameter hemi-beads within the gaps increases the film's reflectance value, such that the film's apparent brightness declines as a relatively smooth, continuous function of viewing angle, for viewing angles ranging from 0~ (normal incidence) to about 40~, which is the preferred angular viewing range.

Film (22A) augmentant la brillance et possédant une monocouche de perles (24) approximativement hémisphériques, transparentes, agglutinées les unes aux autres et présentant un diamètre supérieur. Etant donné la forme hémisphérique de ces perles, des espaces (26) subsistent entre les perles contiguës parmi les perles hémisphériques de diamètre supérieur. Un nombre important de ces espaces comportent au moins une perle transparente (28) approximativement hémisphérique dont le diamètre est sensiblement inférieur à celui des perles hémisphériques de diamètre supérieur. La présence de perles hémisphériques de diamètre inférieur à l'intérieur de ces espaces augmente la valeur de réflectance du film, de sorte que la brillance apparente de ce dernier décline de façon relativement lisse et continue en fonction de l'angle de visualisation, pour des angles de visualisation situés dans une plage de 0· (incidence normale) à 40·, ce qui représente la plage de visualisation angulaire préférée.

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