Vertical color shift correction in a rear projection television screen
AssigneeRCA Corporation
InventorBertram VanBreemen
Life of this patent
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Abstract
A rear projection television receiver incorporates red, green and blue-image producing kinescopes and a screen which includes a prism lens arrangement. The prism lens comprises a number of prism lens elements made up of a plurality of lens surfaces or facets. The prism lens forms the vertical audience envelope of the screen, which results from a combination of the vertical audience envelope contributed by the differently angled facets. Planes normal to the horizontal centerline of the faceplates of the red and blue image-producing kinescopes are displaced with respect to a plane normal to the horizontal centerline of the faceplate of the green image-producing kinescope in order to correct vertical color shift.
Claims13
In a rear projection television receiver incorporating a video image source and a rear projection screen comprising a field lens;
- a light directing prism lens comprising a plurality of horizontally disposed lens elements;
- and a focusing lens for focusing said directed light onto an image surface,
- said video image source comprising a plurality of horizontally aligned monochrome kinescopes, each of said kinescopes producing an image on a faceplate wherein a plane normal to the faceplate and passing through the horizontal centerline of at least one of said kinescopes is displaced with respect to a plane normal to the faceplate and passing through the horizontal centerline of another of said plurality of kinescopes.
A rear projection television receiver incorporating a video image source and a rear projection screen comprising a field lens;
- a light directing lens comprising a plurality of horizontally disposed lens elements, each of said lens elements incorporating means for directing light at a plurality of predetermined angles;
- and a focusing lens for focusing said directed light onto an image surface,
- said video image source comprising a plurality of horizontally aligned monochrome kinescopes, each of said kinescopes producing an image on a faceplate wherein a plane normal to the faceplate and passing through the horizontal centerline of at least one of said kinescopes is displaced with respect to a plane normal to the faceplate and passing through the horizontal centerline of another of said plurality of kinescopes, further comprising mounting means comprising a plurality of mounting locations, each of said mounting locations receiving one of said kinescopes at an angle arcuately displaced with respect to the other of said kinescopes.
A rear projection television receiver incorporating a video image source and a rear projection screen comprising a field lens;
- a light directing lens comprising a plurality of horizontally disposed lens elements, each of said lens elements incorporating means for directing light at a plurality of predetermined angles;
- and a focusing lens for focusing said directed light onto an image surface,
- said video image source comprising a plurality of horizontally aligned monochrome kinescopes, each of said kinescopes producing an image on a faceplate wherein a plane normal to the faceplate and passing through the horizontal centerline of at least one of said kinescopes is displaced with respect to a plane normal to the faceplate and passing through the horizontal centerline of another of said plurality of kinescopes wherein said means for directing light comprises a plurality of facets, said facets forming different angles with respect to a vertical plane.
A rear projection television receiver incorporating a video image source and a rear projection screen comprising a field lens;
- a light directing lens comprising a plurality of horizontally disposed lens elements, each of said lens elements incorporating means for directing light at a plurality of predetermined angles;
- and a focusing lens for focusing said directed light onto an image surface,
- said video image source comprising a plurality of horizontally aligned monochrome kinescopes, each of said kinescopes producing an image on a faceplate wherein a plane normal to the faceplate and passing through the horizontal centerline of at least one of said kinescopes is displaced with respect to a plane normal to the faceplate and passing through the horizontal centerline of another of said plurality of kinescopes, wherein said means for directing light comprises a single facet and wherein a plurality of predetermined numbers of said lens elements comprise means for directing light comprising facets forming respectively different angles with
In a rear projection television receiver incorporating a rear projection screen comprising a field lens receiving light from a video image source for substantially collimating said light, said video image source comprising a plurality of horizontally aligned different color-producing monochrome kinescopes;
- a prism lens disposed adjacent to said field lens for receiving light from said field lens and comprising a plurality of horizontally disposed prism lens elements, said prism lens elements refracting light from said kinescopes respectively through unequal angles;
- and a focusing lens for receiving and focusing said directed light from said prism lens onto an image surface,
- each of said kinescopes producing an image on a faceplate wherein a plane normal to the faceplate and passing through the horizontal centerline of at least one of said kinescopes is displaced with respect to a plane normal to the faceplate and passing through the horizontal centerline of another of said plurality of kinescopes, in order to compensate for said unequal refraction of said light from said kinescopes.
Dependencies are inferred from the claim text.