Brightness enhancement film for backlit image displays
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United States of America Patent
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Oct 23, 2007
Grant Date -
Nov 10, 2005
app pub date -
Mar 16, 2005
filing date -
May 7, 2004
priority date (Note) -
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status (Latency Note)
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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.degree. (normal incidence) to about 40.degree., which is the preferred angular viewing range.
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