Head-up display system where polarized light from a display impi

Details Head-up display system where polarized light from a display impi Head-up display system where polarized light from a display impi

1993-07-20

1996-04-23

Gross, Anita Pellman

Optical: systems and elements

Holographic system or element

Having optical element between object and recording medium

359 13, 359 73, 359487, G03H 100, G02F 113, G02F 11335, G02B 530

Patent

active

055109136

ABSTRACT:
A head-up display system for a vehicle includes a front windshield, a display, a polarizing member and an optical rotatory film. The display for displaying an image on the front windshield to be viewed by a driver of the vehicle is disposed such that light therefrom is incident on the front windshield at an angle which is substantially equal to Brewster's angle. The polarizing member is disposed between the front windshield and the display for polarizing light from the display. The optical rotatory film serves to rotate the plane of polarization of light polarized by the polarizing member. The optical rotatory film installed on the front windshield includes a liquid crystal high polymer which is in twisted nematic orientation under liquid crystal condition and is in glassy condition at a temperature which is lower than liquid crystal transition point. Thus, double image problem can be eliminated with respect to light having a wide range of wavelengths.

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