Patent ID: 6912074

Claim:
An apparatus for producing a holographic screen for displaying a stereoscopic or multiview color image by recording interference patterns on a photoplate located on xy-plane of three dimensional space, comprising: a laser for generating a light beam; a beam splitter for dividing the light beam into a reference beam and an object beam; a first mirror for reflecting the reference beam; a first lens locating on z-axis for focusing the reflected reference beam to form a diverging reference beam for the photoplate; a second mirror for reflecting the object beam; a second lens for forming the reflected object beam; and a diffuser having a length of Z 22 −Z 21 disposed perpendicular to the photoplate and illuminated by said second lens, wherein Z 21 , distance to the nearest point of the diffuser from xy-plane, Z 22 , distance to the farthest point from xy-plane, are calculated from following equations: Z 21 = 1 [ 1 Z 1 2 + ρ max 2 + λ 1 λ 21 ⁢ ( 1 Z 3 2 + ρ max 2 + 1 Z 4 2 + ρ max 2 ) ] 2 - ρ max 2 ( 7 ) Z 22 = 1 1 Z 1 + λ 1 λ 22 ⁢ ( 1 Z 3 + 1 Z 4 ) ( 8 ) where λ 1 is the wavelength of the laser used for the holographic screen recording, λ 21 is the shortest wavelength of the displayed image, λ 22 is the longest wavelength of the displayed image, Z 1 is distance to the reference beam source from the XY-plane in the recording setup, Z 3 is distance from the projector to the holographic screen in the image projection setup, Z 4 is distance from the screen to the focusing point of the diffracted beams, and ρ max is distance from Z-axis of the farthermost point of the photoplate.