Abstract:
A projection television display tube comprising in an evacuated envelope a display screen on the convexly curved inside of a display window in the wall of the envelope, which display screen comprises a layer of luminescent material and a multilayer interference filter between said material layer and the display window, the filter comprising a number of layers which are alternately high refractive index (H) and low refractive index (L). The filter is composed of at least 6 layers, each having an optical thickness nd, wherein n is the refractive index of the material of the layer and d is the thickness, which optical thickness is between 0.2.lambda..sub.f and 0.3.lambda..sub.f, wherein .lambda..sub.f is equal to p x .lambda., wherein .lambda. is the desired central wavelength which is selected from the spectrum emitted by the luminescent material and p is a number between 1.18 and 1.32.
Abstract:
A liquid crystal display is provided on the surface of a vidicon face plate. A number of conductive pins or electrodes connect to associated field effect transistors imbedded in the liquid crystal display for selectively energizing discrete areas in the liquid crystal display; the pins extend through the vidicon face plate. The electron beam of the vidicon is scanned sequentially across the terminals, and is turned on and off in accordance with stored binary data to impinge upon and selectively activate certain ones of the pins or electrodes, turning on the associated FET. After the full face of the vidicon has been scanned to form the desired pattern of activated FET's, a voltage is applied across the liquid crystal display. The area opposite each turned on FET will be appropriately polarized presenting a display on the outward facing surface of the display. This display is used to excite a photoconductive drum such as in an electrostatic photocopier to print a copy of the display data.
Abstract:
A video projector has a structure wherein a projection lens is disposed to be fixed at a predetermined distance with respect to a front surface of a faceplate of a projection cathode-ray tube through a medium. The medium has substantially the same refractive index as that of the glass used for the faceplate and the projection lens. A resin adhesive, for example, may be used as the medium.
Abstract:
Undesired light radiations emitted by europium activated red luminescent phosphors employed in projection color televisions are greatly reduced, with essentially no reduction in the desired radiation, by employing as a filter a solution containing a soluble holmium salt and a soluble neodymium salt.
Abstract:
An infrared simulator serves to directly transduce electron beams into infrared radiation. To this purpose a modified cathode-ray tube is provided which includes an infrared transmissive window. Behind this window a film within the vacuum of the cathode-ray tube is arranged in order to transduce the electron bombardment into infrared radiation.
Abstract:
A large-area electroluminescent (EL) faceplate for storage CRT is described. The EL faceplate has a non-planar mesh structure which includes individual current limiting resistance between a power source and an array of small-area active regions for improving the faceplate breakdown characteristics. The mesh, which comprises high conductivity strips and delivers power to the active regions, is substantially reduced in area relative to a simple conventional device, and is disposed on thick dielectric nonactive regions to further reduce the possibility of catastrophic breakdown.
Abstract:
An envelope for a projection television tube includes a spherically curved electronic beam target surface spaced away from the neck of the tube, a larger reflective surface spherically curved concentrically with the target surface on an end plate located close to the tube neck, a target support that preferably constitutes a face plate for the envelope, and a hollow cylindrical spacer member for closing the side of the tube envelope and for holding the target support accurately spaced from the reflective surface. The ends of the cylindrical member and the abutting surfaces of the end plate and target support are all configured to provide joint interfaces between the elements that lie in spherical planes that are concentric with the target and reflective surfaces, so that slight lateral motion of the parts during assembly and handling will not affect tube projection optics, while the spacing between the target and reflective surfaces is precisely maintained in concentric relationship.
Abstract:
An improved bistable storage target structure for a cathode-ray tube includes a faceplate-supported transparent target electrode covered by a transparent insulating layer. Overlying the insulating layer is an apertured web collector electrode and a storage component of secondary emissive material formed by a plurality of phosphor deposits disposed within the web apertures. A patterned layer of insulating material is provided overlying the web electrode to isolate the phosphor deposits from the collector electrode.
Abstract:
A projection tube projects in front a visible light image produced by irradiating a target having a fluorescent screen formed on one surface thereof with an electron beam emitted from an electron gun. The projection tube includes an X-ray shield disposed to cover the surface of the target excluding the fluorescent screen, whereby the X-ray generated by irradiating the fluorescent screen on the target with the electron beam are shielded to prevent the transmission of the X-rays to the front of the projection tube, and also the X-ray shield has the effect of dissipating the heat from the target and simplifying the target positioning operation in the manufacture of projection tubes.
Abstract:
An evacuated envelope has a rectangular display section and a gun section at one side of the display section. The display section includes rectangular front and back walls in closely spaced, substantially parallel relation, and a plurality of spaced, substantially parallel support walls between the front and back walls forming a plurality of parallel channels. The gun section extends across one end of the channels and includes gun structure which will selectively direct one or more electron beams along each of the channels. In each of the channels is a beam guide which confines the electrons of the beam but permits selective deflection of the electron beam out of the guide toward a phosphor screen on the inner surface of the front wall. The beam guide includes spaced, parallel conductors on the inner surface of the back wall extending transversely across the channels and a plurality of electrodes on the surfaces of walls which extend from the back wall toward the front wall. The electrodes on each surface of the walls are arranged in spaced, parallel rows extending longitudinally along the channel. Electrical potentials are applied to the electrodes which create electrostatic fields between the electrodes in the two rows as well as between the electrodes on adjacent walls. These electrostatic fields create forces which confine the electrons in a beam which flows longitudinally along the channel. Potentials applied to the electrodes on the back wall cause the beam to be deflected out of the beam guide toward the front wall.