Brightness rise film for back light equipped picture display.

摘要

The brightness rise film (22A), almost being the half globose, the transparency, it filled up densely, the semi- beads of bigger diameter (24) it has possessed. As for the semi- beads because of semi- globose form, the semi- beads, between the beads which of bigger diameter adjoin, the opening (26) remains. The diameter which is smaller than diameter of the semi- beads of big diameter substantially, one almost the semi- globose transparent semi- beads (28) is offered to the opening of considerable number, at least. The semi- beads of smaller diameter are offered inside the opening. With this, reflectance ratio value of the film increases, relatively decreases to observation angle as a result, brightness in regard to appearance of the film the 0 which is the ideal angular observation range (normal incidence) from to approximately 40 vis-a-vis the observation angle which changes, as smooth continuous function.