Abstract: A method of manufacturing luminescent screens (2) for, e.g., color picture tubes is described. It uses a printing apparatus with heated printing blocks (3) and tampons (4). The printing inks (D) consist of a mixture of a hot-melt adhesive and the respective luminescent materials. The printing inks are printed from the printing blocks directly on the inside of the faceplate (1) of the color picture tube. It is also possible to first print a black matrix (M) of a ceramic glass color.

Abstract: In a flat, vacuum-enclosed picture-reproducing device having a phosphor-coated glass faceplate and a shallow tray-shaped rear housing in which a cathode consisting of a periodic array of oxide-coated heating wires is located in front of a counterelectrode, and which contains a control arrangement between the cathode and the faceplate, a perforated anode is present between the heating wires and the control arrangement, which consists of two layers of electrodes, and the counterelectrode has segments arranged perpendicular to the longitudinal dimension of the oxide-coated heating wires.

Abstract: Control plates in flat display devices are located between the cathode and the screen and serve to control the electron flow. To permit easy contacting even if the conductors (1) of the control plates are very narrow, the conductors (1) alternately have broadened ends on opposite sides of the control plate. The ends are broader by the width of the respective adjacent conductor.

Abstract: A projection tube includes a liquid crystal cell having liquid crystal material sandwiched between two plates. The cell is addressable by an electron beam and serves as a light valve for plane-parallel light with which the projection tube is illuminated from behind. On the side facing the liquid crystal material, the plate on which the electron beam writes has dot coatings of indium-tin oxide to achieve a high resolution and a sharp definition of the image to be displayed on a screen. The side of the plate on which the electron beam writes has an insulating layer of magnesium oxide.

Abstract: During silk-screen printing, the stencil (3) is stretched as a result of the pressure exerted by the squeeges (6) This results in a distorted pattern on the material (4) to be printed. To eliminate this error, the design (7') in the stencil (3) is predistorted in such a way that a distortion-free printed pattern (8') is obtained.

Abstract: A shallow electronic image display device having a trough-shaped display screen of glass with a slightly convex exterior surface and a planar phosphor coated interior surface with a peripheral side wall terminating in an edge defining a common plane in sealing relation with a matingly configured peripheral flange of a tray-shaped metallic back case to form a chamber. Disposed within the chamber within the back case is an areal cathode structure in generally parallel relation with the interior surface of the screen with a plate-shaped electron beam control structure in parallel relation intermediate the interior surface and the areal cathode structure. A tensioned metal band encircles the side walls of the display screen to provide implosion protection.

Abstract: An apparatus for the assembly and alignment of a video display device having a base plate and a holding device, the base plate including a plurality of movable adjusting studs projecting therefrom for engaging a plurality of alignment holes located in a plurality of structured plates of the video display device. The holding device includes a plurality of adjustable stops for engaging and aligning a spacing frame and a screen plate. Each alignment hole includes a diameter reducing metal ring to ensure precise alignment of the structured plates which are aligned and joined to the spacing frame and screen plate. The video display device is then removed from the apparatus.

Abstract: The invention relates to the construction and the mode of operation of vacuum-fluorescent display matrices which, as regards size and manufacturing investment, can compete with LCD versions and have the added advantage of being self-luminous. Between a rear wall plate and a closely adjacent transparent front plate which are both provided on their insides with transparent conductor leads, only the filaments are disposed. The fluorescent material (phosphor) is deposited as spaced segments on the conductor leads of the front plate. For activating the fluorescent segments, the electron stream is redirected, by reversing the polarity of the associated conductor leads, from the rearward electrode to the fluorescent segments on the front plate. Matrix addressing serves the selection of the character elements.

Abstract: In the manufacture of display structures--including fluorescent material displays--by means of a print process, a base material (glass or plastic material), prior to the print process, is coated with an electrically conductive layer. During the print process, a strippable coating or pigmented lacquer having the shape of the structure, is deposited onto a first layer. After the print process, the non-printed electrically conductive layer is etched away and in the case of the non-fluorescent display structure, the strippable coating is peeled off the electrically conductive layer. The invention provides an improvement in the manufacture of display structures over the hitherto conventional photographic reproduction of silk-screen printing methods, and provides display structures having sharp edges to a thickness of approximately 10 .mu.m.

Abstract: A rear plate of a liquid-cell display device has louvers embedded therein that allow light to pass from the rear of the display device toward the front only at angles that will cause most or all of the light to be internally reflected at the front plate unless the light has been scattered by the light-scattering fluid of the device.