Patent ID: 6095652
Filing Date: 2000-08-01
Classification: G02B

Abstract:
A projection system comprising a screen, the screen comprising:a diffraction grating for diffracting light into diffracted light which includes zero order attenuating means for receiving the diffracted light from the diffraction grating and for attenuating the zero order light from the diffraction grating to produce attenuated light;a diffuse holographic optical element for receiving the attenuated light from the attenuating means and for bending the attenuated light to reconstruct a real image; anda focusing system element with positive optical power disposed in an optical path of the light passing through the diffraction grating, the attenuating means and the diffuse holographic optical element wherein the aggregate optical power of the grating and the holographic optical element is less than that of the focusing element whereby the projection system exhibits a minimized chromatic aberration in a direction perpendicular to the plane of the screen.