Brightness enhancement film for backlit image displays

Details Brightness enhancement film for backlit image displays Brightness enhancement film for backlit image displays

2007-10-23

2007-10-23

Mack, Ricky (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

11080565

ABSTRACT:
A brightness enhancement film having a monolayer of approximately hemispherical, transparent, closely packed larger diameter hemi-beads. Due to the hemi-beads' hemispherical shape, gaps 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 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.

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