Abstract: A three-dimensional rear projection screen that has substantially improved contrast by using a tinted layer disposed between the source of the projected light and the light diffusion layer. This tinted attenuation layer diminishes the back-scattered light more than it diminishes the desired forward-scattered light which makes up the image on the screen. The contrast of the image is thus improved because the reduction of the back-scattered light relative to the forward-scattered light diminishes the degradation of contrast caused by the impingement of spurious light onto opposite portions of the rear projection screen.

Abstract: A projection apparatus comprising a three-dimensional screen, a convex mirror, two or more projectors, and an assemblage of flat mirrored surfaces that share at least one common edge or apex that faces the convex mirror. The flat mirrored surfaces fold the images from separate projectors into a common image that has single optical axis aligned with principal axis of the convex mirror so that the combined image is reflected from the convex mirror onto the three dimensional screen.

Abstract: A projection system employs a convex reflecting mirror to disperse a projected image onto the inner surface of a screen enclosing a spherical or other three-dimensional space. When the screen is a spherical, translucent rear-projection screen, the projection system produces a display of substantially spherical form viewable from outside the enclosed space. When the screen is opaque and of spherical or other three-dimensional form, the projection system produces a three-dimensional image surrounding a viewer.

Abstract: An imaging system produces an accurately colored representation of any desired land portion of the Earth's surface based on its measured red and near infra-red radiation. The land's image is composed of a set of pixels, each colored to represent the color of a corresponding area of the land. In the course of generating the image, the system classifies each area of the land based on scan data produced by satellites measuring red and near-infrared radiation from each area of the land. The system associates a color with each land class and colors the image pixel corresponding to each area of the land with the color associated with its class. The system allows an operator to supply input calibration data controlling the color associated with each class.

Abstract: An improved and simplified method of fabricating field effect transistors in metal oxide semiconductor integrated circuits advantageously employs the differential growth rate, under certain temperature conditions, between oxide on silicon wherein phosphorous has been diffused, and on silicon without such diffusion. The improved method of fabrication reduces the number of fabrication steps required, while simultaneously producing field effect transistors with superior operation speeds.