Wedge Shaped PVB For Head-Up Display (HUD)

Dr. Holger Stenzel

Head-up displays make driver and vehicle
information easily accessible by projecting it onto
the windshield just below the driver´s line of sight.
Without taking the eyes off of the road, drivers are
informed of important vehicle data, such as
speed, engine warnings or navigation data.
For its realization a wedge shaped PVB-film is
neccessary. The wedge shaped film avoids the
formation of echo images. Those echo images are
dependent on the angle and the thickness of the
windshield as well as the angle of incidence of the
beam. Standard wedge angles are defined in
order to avoid special developments for every
type of windshield.
For production of the wedge shaped film small
flexible extrusion lines up to a film width of
1200mm are necessary. Colour band film is also
available. The loss of thickness during the
stretching process of the film has to be com-pensated
in the production process.

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