Holographic projection screen having a rear-facing fresnel lens
AssigneeThomson Licensing
InventorsEstill Thone Hall, Jr., Wendy Rene Pfile
Life of this patent
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Abstract
A screen for a projection-type video display apparatus. A linear-type Fresnel lens has a lens pattern on a first side for receiving light energy from a light source. A second side of the Fresnel lens is opposite the first side. The light energy exits the Fresnel lens from the second side. A hologram is affixed to the second side of the Fresnel lens for managing the dispersion of the light energy exiting from the second side of the Fresnel lens. The hologram is affixed to the Fresnel lens by any of various lamination processes.
Claims9
A screen for a projection-type video display apparatus, said screen comprising:
- a first light transmissive layer having first and second sides opposite one another;
- a Fresnel lens formed on said first side of said first light transmissive layer;
- a three-dimensional hologram affixed to said second side of said first light transmissive layer for controlling color shift of light received from said Fresnel lens through said first light transmissive layer;
- a second light transmissive layer affixed to said hologram on a side of said hologram opposite said Fresnel lens, said second light transmissive layer having a second side opposite said first side and forming an image viewing surface;
- and,
- said Fresnel lens, said first light transmissive layer, said hologram and said second light transmissive layer together forming a laminated screen, respective images projected onto said Fresnel lens of said screen being viewable as a composite image on said viewing surface.
A video projection display apparatus, comprising:
- a plurality of video image projectors operating with respective colors;
- a Fresnel lens positioned in a rearwardly facing direction for receiving and aligning light rays defining images projected from said video image projectors onto said Fresnel lens;
- and,
- a three-dimensional hologram disposed on a first side of a substrate and positioned for receiving said aligned light rays from said Fresnel lens, said hologram controlling color shift performance of said images received from said Fresnel lens and transmitting said color shift controlled images into said substrate, said images being viewable on a second side of said substrate,
- whereby minor axis brightness of said viewed images is improved by said rearwardly facing direction of said Fresnel lens.
A method for manufacturing a screen for a projection-type video display apparatus, comprising the steps of:
- forming a three-dimensional hologram on a substrate in an orientation adapted to enable light received from a first side of said hologram to be controllably dispersed into said substrate from a second side of said hologram;
- and,
- affixing said first side of said hologram to a Fresnel lens in an orientation adapted to receive light transmitted through said Fresnel lens, thereby forming a laminated screen,
- whereby images projected onto said Fresnel lens are viewable on said second side of said substrate;
- and,
- disposing an array of lenticular elements on a first side of a layer to form said Fresnel lens, said lenticular elements extending in a direction opposite to a flat second side of said layer;
- and,
- affixing said first side of said hologram to said flat second side of said layer.
Dependencies are inferred from the claim text.