Operating mode of the pronova projection screens
HoloProâ„¢ and HoloSign
HoloProâ„¢ and HoloSign are based on the same technique: Holography.
A special photographic film is illuminated with a laser beam and a single hologram, also called a holographic optical element (HOE), is fromed. A HoloPro™ screen consists of many thousands of such HOEs and none is identical with any other on the screen. Though they all look alike, each one of them contains different information, namely from which angle the light is redirected to the viewer. Consequently, the light of the projector is optimally redirected from many thousands of spots. The effect is extremely high light efficiency and an accordingly high peak gain (3.8), and neither a hot spot nor a Moirée pattern can disrupt the picture.
The form of the HOEs at HoloProâ„¢ was originally rectangular; since fall 2002 they have been hexagonal, because in this way the human eye hardly perceives the structure.
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