Abstract: A winding apparatus, for winding saddle coils for deflection units of picture tubes, has a wire guide tube that is movable along the contour of the desired windings in three mutually perpendicular planes. A receiving device for the coil form is rotatable about its longitudinal axis. In another embodiment the coil form remains stationary and the wire guide tube has one end angled at 90.degree. and rotatable about its longitudinal axis.

Abstract: In a cathode-ray tube with a thick grid No. 2 (24) in the electron-gun system, current transfer into grid No. 2 (24) may result in a lack of picture sharpness. To avoid this error, the aperture (4) in grid No. 2 (24) has a widening (6) of conical shape or stepped diameter.

Abstract: A rack for supporting a cathode-ray tube during sealing of the screen portion of the tube to the bulb cone portion of the tube is disclosed. The rack includes tubing mounted to the rack through which gas can be blown into the tube. An exit end section of the tubing is of flexible design and includes a helical spring and a plurality of resilient leaf spring tongues for aligning the tubing in the neck of the cathode-ray tube.

Abstract: The invention relates to a flat display device with a faceplate (1) having either an outward curvature or bulging inwards under the action of atmospheric pressure, the device also comprising a planar deflection device (8) to deflect the electron beams (13, 14) in each line. With a view to obtaining a pure-color image, the deflection voltages are corrected according to the particular distance between the deflection device (8) and the faceplate (1), thereby ensuring that the electron beams (13, 14) will impinge only on the appropriate equidistant phosphor dots or strips (4). The formula for calculating the correction factor (K) is stated.

Abstract: In a glass viewing screen for a color-picture-reproducing device, the phosphor areas deposited on the inside of the glass viewing screen are surrounded by a sealing-glass matrix. The matrix is made of a sealing glass that shrinks upon thermal crystallization so that the sealing glass may be deposited by screen printing.

Abstract: A conductive suspension for making contact to the inside of a picture tube consists of graphite, glass-frit powder, a binder, such as nitrocellulose, a solvent, such as isoamyl acetate. It can be applied prior to or after the aluminizing process by various techniques, such as brushing, printing, or spraying, and permits the bake-out process and the frit-sealing process to be performed in one step because it is permeable to organic substances. It is easy to remove from defective tube parts by conventional cleansing techniques.

Abstract: The electron gun system of a color picture tube has coined depressions in the area of the apertures for the electron beams in at least one grid electrode, the coined depressions in one side of the grid electrode being concave. Preferably, this is the side of the grid electrode facing the cathode.

Abstract: During the formation of a black-matrix layer on the inside surface of a faceplate of a color picture tube, the development of the photoresist coating takes place in an atmosphere with a relative humidity of between about 80-100% and at a temperature of between about 30.degree.-50.degree. C.

Abstract: A winding apparatus, for winding saddle coils for deflection units of picture tubes, has a wire guide tube that is movable along the contour of the desired windings in three mutually perpendicular planes. A receiving device for the coil form is rotatable about its longitudinal axis. In another embodiment the coil form remains stationary and the wire guide tube has one end angled at 90.degree. and rotatable about its longitudinal axis.

Abstract: The shadow mask (2) of a color picture tube has retaining springs (6) near its corners and parallel to its rim. The free ends of the retaining springs (6) extend into the corners of the faceplate (1), where they rest on spherical ends (10) of studs (5). The ends of the retaining springs (6) are bent so as to be perpendicular to the longitudinal axes of the studs (5).

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: In a color picture tube with an in-line gun system elliptic beam-spot distortion caused by the deflection field is compensated for by pairs of plates in at least one focus electrode. The plates project into the apertures for the electron beams and are located at a distance from the bottom of the focus electrode.

Abstract: A liquid crystal cell is disclosed in which the cell walls facing the liquid crystal material are provided with alignment layers of organic material. This material consists of polymer chains with side chains. The ends of the side chains interact with the liquid crystal molecules. The side chains are shorter than the liquid crystal molecules. By suitable choice of the length of the side chains, the tilt angle can be set. It is also possible to provide alternately different side chains one of which interacts with one end of the liquid crystal molecule, while the neighboring side chain interacts with the other end of the same molecule.

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: In a color-picture tube, the conductive coating on the inside of the cone is a suspension without organic constituents. The conductive coating on the inside of the neck, which is contiguous to the conductive coating on the inside of the cone, consists of the aforementioned suspension with an addition of organic constituents. A sharp and scratch-resistant boundary between the conductive coating in the neck and the uncoated area of the neck is thus obtained.

Abstract: To deposit a solderable metal layer on conductive paths (4) of ITO on substrates of display devices (1) by an electroless method, the conductive paths are activated, prior to the deposition, and the areas not covered by the conductive paths are subsequently inactivated. The activated paths are then metallized with a solderable metal layer so that integrated circuits can be soldered to the metallized conductive paths.

Abstract: An arrangement to produce pictures using light polarized in different directions consists of a picture tube to whose faceplate a polarizer film and a polymer liquid crystal film provided on both sides with transparent conductive layers are joined with a transparent adhesive. By using a polymer liquid crystal film, the arrangement can also be realized on picture tubes having curved faceplates. The polarizer film and the polymer liquid crystal film are joined together preferably by laminating, and the laminate is joined to the faceplate with an adhesive. The polymer liquid crystal film preferably contains a ferroelectric liquid crystal material.

Abstract: Oxide cathode wires are produced by coating tungsten wires with emissive material by cataphoretic coating. It is important for the coating to have a substantially uniform thickness over the entire surface of the wire. This is achieved in a simple manner by reversing the polarity of the direction of current flow for a short time at the beginning of the coating process, so that the tungsten wire to be coated is connected as an anode. The remainder of the coating process is performed in a known manner with a tungsten wire connected as a cathode.

Abstract: A shadow-mask color picture tube has a glass panel and glass funnel joined together via outwardly extending flange portions thereof. To mount a shadow mask in the picutre tube, holding plates are fastened between the flanges, preferably in internal recesses of the flanges, and each of the holding plates has a hole for a rivet which holds the mask and, in a preferred embodiment, an internal shield. The mask is preferably connected with the holding plates via bimetal elements.