Information display system having transparent holographic optica

Optical: systems and elements – Holographic system or element – Head up display

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Details

359 15, 359 25, G02B 532, G03H 130

Patent

active

052913163

ABSTRACT:
An information display system has a display screen which is substantially transparent to a selected band of wavelengths of light and can be mounted on a window. A projector projects an image of light of the wavelengths to which the display screen responds onto the screen to reflect or transmit the selected wavelengths of light from the screen. The screen is formed as a holographic optical element which reflects the light such that an observer is able to see the projected image from the display screen only if his eyes are within a predetermined area, while observers outside of the area see only a substantially transparent display screen on the window.

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