FLAT-PANEL PROJECTION DISPLAY

摘要

A flat-panel projection display comprises a slab waveguide 1 having a preferably embossed diffraction grating 2 on one face, a lens 3 for directin g light into an edge of the waveguide, and in the focal plane of the lens a liquid-crystal modulator 4 for the modulating the intensity of the light as a function of lateral position and elevational direction of travel. The light is ejected from the slab waveguide 1 by the grating at angles corresponding to the input angles, giving a virtual display. The light from the modulator can be expanded in one dimension by passing through a magnifying waveguide 7, followed by scattering in the plane by a screen 13 projection by a lens 10 a t the other end of the waveguide 7. Head-up and 3-D displays can be constructe d using this principle.