An optical film having excellent light utilization efficiency and high brightness,
and a liquid crystal display using the optical film. The optical film is formed
by laminating integrally a brightness enhancement film (A) that separates natural
light into transmitted light and reflected light and a collimating film (B) having
an uneven portion on a surface thereof. Since an air interface is eliminated by
the integral lamination of the brightness enhancement film and the collimating
film, stray light is reduced, and the brightness enhancement film has an improved
efficiency in reflecting and polarizing light; thereby, enhancing the brightness.
