Abstract: An apparatus for projecting an image includes a light source, a polarization modulator, a projection lens, and a mirror. The mirror is positioned between the light source and the modulator and blocks a cross-sectional portion of the light from the light source from reaching the modulator. Light from the light source that reaches the modulator has its polarization modulated in accordance with a video signal to be displayed to produce a modulated signal corresponding to the video signal. The modulated light signal is reflected from the mirror into a projection lens.

Abstract: Partially polarized light produced by an integrator/polarization conversion system combination and two non-pixilated twisted nematic liquid crystal display cells (TN-LCD) or other light modulators are utilized. By adjusting the voltages on the TN-LCD cells, it is possible to adjust the relative amounts of the greatest two of the colors supplied, of the red, green and blue colors, used by the display without changing the light of the color in the least supply. Because all of the adjustments are done electronically through voltage controls, not mechanically, the “white” point correction system is both simple and reliable.

Abstract: A projection system is disclosed that utilizes a modulator, preferably in the form of an LCD matrix, to modulate light in accordance with a video image to be displayed. The light is supplied to the LCD matrix, reflected back off the matrix through a lens to a mirror, and then imaged through another lens. The mirror is placed in the path between the light source and the LCD matrix.

Abstract: A projection system is disclosed that utilizes a modulator, preferably in the form of an LCD matrix, to modulate light in accordance with a video image to be displayed. The light is supplied to the LCD matrix, reflected back off the matrix through a lens to a mirror, and then imaged through another lens. The mirror is placed in the path between the light source and the LCD matrix.

Abstract: Partially polarized light produced by an integrator/polarization conversion system combination and two non-pixilated twisted nematic liquid crystal display cells (TN-LCD) or other light modulators are utilized. By adjusting the voltages on the TN-LCD cells, it is possible to adjust the relative amounts of the greatest two of the colors supplied, of the red, green and blue colors, used by the display without changing the light of the color in the least supply. Because all of the adjustments are done electronically through voltage controls, not mechanically, the “white” point correction system is both simple and reliable.

Abstract: An imaging system, comprising a broadband unpolarized white light source (81), a polarization converter system for converting polarization axes of unpolarized white light into a substantially single polarization axis, to produce a beam of polarized light, a selective polarization filter (82), adapted to selectively rotate a polarization axis of a selected spectral band of light of the with respect to remaining polarized light based on a control signal (119), a polarized beam splitter (84), for separating light having a the substantially single polarization axis from light having a rotated polarization axis, a pair of electro-optic spatial light modulators (86, 89), disposed along a path of light within the spectral band and a path of remaining light outside the spectral band, respectively, and being adapted to modulate an image therein, and a polarized beam splitter (88), for recombining modulated light from the pair of light modulators.

Abstract: A one-dimensional tension mask-frame assembly for a color cathode ray tube includes a rectangular frame whose top and bottom members each have inwardly flexed upstanding portions with a spring constant, and a rectangular mask secured to the frame along the free edges of the upstanding frame portions, the frame portions maintaining the mask in a state of tension during thermal expansion of the mask. The assembly is useful in color display applications such as T.V.

Abstract: The thickness distribution of a vapor deposited layer such as an interference filter deposited on a substrate such as a glass faceplate for a projection television tube, is controlled in the plane of the substrate by employing at least one variable transmission mark to partially shield the substrate during deposition.

Abstract: The thickness distribution of a vapor deposited layer such as an interference filter deposited on a skirted substrate such as a glass faceplate for a projection television tube, is improved by shielding the substrate from indirect flux of vapor so as to reduce the shadowing effect of the skirt upon the thickness distribution of the deposited layer thereby improving the white field uniformity of the resultant projection image.

Abstract: A method whereby the thickness distribution of a vapor deposited layer, such as an interference filter deposited on a skirted substrate such as a glass faceplate for a projection television tube, is improved by shielding the substrate from indirect flux of vapor so as to reduce the shadowing effect of the skirt upon the thickness distribution of the deposited layer, thereby improving the white field uniformity of the resultant projection image.

Abstract: The thickness distribution of a vapor deposited layer such as an interference filter having deposited on a moving substrate such as a glass faceplate for a projection television tube, is controlled along an axis in the direction of travel of the substrate by employing at least one rotatable dodger to partially shield the substrate as it passes behind the dodger during deposition.

Abstract: The thickness distribution of a vapor deposited layer such as an interference filter deposited on a moving substrate such as a glass faceplate for a projection television tube, is controlled along an axis in the direction of travel of the substrate by employing at least one rotatable dodger to partially shield the substrate as it passes behind the dodger during deposition.

Abstract: The white field uniformity of a projection color TV employing three monochrome cathode ray tubes is improved by matching the center-to-edge luminance gradient of the red-emitting and/or blue-emitting tube to that of the green-emitting tube having an interference filter. In a preferred embodiment, such matching is achieved by applying an optical filter of varying density on the outside surface of the display window of the tube.

Abstract: The variation in center-to-edge luminance gradient along the minor axis of the red-emitting and/or blue-emitting tube having a multilayer interference filter, is reduced by reducing the number of layers in the filter making it easier to match the gradients to that of the green-emitting tube, and thereby improve the white field uniformity of a projection color TV employing three monochrome cathode ray tubes.

Abstract: By adjusting the exposure dosages for the three primary color phosphors in the photolithographic process used to produce color CRTs for color television, standard whites of desired color temperatures are obtained. The aperture mask used in the photolithographic process is then discarded, and the CRT is operated as a monochrome tube in a standard receiver. Stable, rugged and portable color references are thus produced.

Abstract: By adjusting the exposure dosages for the three primary color phosphors in the photolithographic process used to produce color CRTs for color television, standard whites of desired color temperatures are obtained. The aperture mask used in the photolithographic process is then discarded, and the CRT is operated as a monochrome tube in a standard receiver. Stable, rugged and portable color references are thus produced.