Abstract: A method for manufacturing a screen for a cathode ray tube is provided comprising the steps of forming a first phosphor layer through coating a phosphor slurry containing a first phosphor, polyvinyl alcohol having a polymerization degree of 1,500 to 2,000 and distilled water on the inner surface of a panel, drying, exposing and developing the first phosphor layer, and then forming a second phosphor layer through coating a phosphor slurry containing a second phosphor, polyvinyl alcohol having a polymerization degree of 1,500 to 2,000 and distilled water on the surface of the first phosphor layer, drying, exposing and developing the second phosphor layer; wetting the surface of the first and second phosphor layers with distilled water; and forming a third phosphor layer through coating a phosphor slurry containing a third phosphor, polyvinyl alcohol having a polymerization degree of 500 to 600 and distilled water on the surface of the first and second phosphor layers, drying, exposing and developing the third p

Abstract: An inline type electron gun has a lopsided electric field applied to it to improve the spot formation of an electron beam in forming an expanded focus lens. The electron gun has first electrode to eighth electrode and has a lopsided electric field formed only at the two side apertures of a trio of apertures formed at one of the opposing sides of the sixth and seventh electrodes before a lopsided main focus lens formed between the seventh and eighth electrodes.

Abstract: In a multi-focusing type electron gun in which first through eighth electrodes and a shield cup are provided, the sixth electrode which forms the center of a second unipotential lens is formed by a primary electrode and a corresponding secondary electrode. The center aperture of the primary electrode has a larger inside diameter than lateral apertures thereof, which is equal to the inside diameter of the lateral apertures of the secondary electrode. The center aperture of the secondary electrode has a comparatively smaller inside diameter than the lateral apertures thereof but which is equal to the inside diameter of the lateral apertures of the primary electrode, so that a voltage difference of the second unipotential lens becomes uniform to obtain an expanded focus lens.

Abstract: A mask frame damper has a vibration absorbing member installed between a mask frame and a stud pin formed in a panel of a CRT. This member has a mounting part to be fixed on a frame and a first and a second absorption part extending therefrom and each bent at a predetermined angle. A bending joint formed between the first and second absorption part is in contact with a stud pin and the end of the second absorption part is in contact with the mounting part. Balls are installed at the first and second absorption parts. The first and second vibration absorption parts, in one embodiment, are formed by a plate spring with balls having a predetermined weight installed therein.

Abstract: A projection color liquid crystal display (LCD) system uses a large reflecting liquid crystal (LC) panel as a screen. The system includes three unicolor light sources for emitting lights of the colors red, green and blue, respectively, the light sources being disposed remote from the screen; three light shutters for permitting the red, green, and blue light beams to successively and periodically pass to the screen; and three diffusing lenses for diffusing the respective beam which is passing to the screen. Each respective light shutter permits the passage of a corresponding light beam. The color driving signal corresponding to the light beam from the image controlling circuit is applied to the driver to drive the LC panel. As a result, the red, green and blue light beams are successively reflected from the reflection type LC panel according to the color driving signal.

Abstract: An electron gun for a cathode ray tube is formed such that the spacing between the electron beam passing holes in a static focus electrode is longer than that between the electron beam passing holes in a dynamic focus electrode which forms a dynamic quadrupole lens with the static focus electrode, thereby enhancing the focusing and convergence characteristics of electron beams.

Abstract: An antistatic coating composition, a manufacturing process thereof, and an antistatic and non-glare picture display screen are disclosed. The manufacturing process for the antistatic coating composition comprises steps of forming a silicate solution by partially hydrolysing a silicate substance, forming a conductive solution containing a conductive material which is formed by doping a molecular water-containing oxide or hydroxide of a soluble inorganic compound with an inorganic second compound, the second inorganic compound and the soluble inorganic compound being different, mixing the silicate solution and the conductive solution, and subjecting the mixture to a hydrolysis and to a polycondensation. According to the present invention, the antistatic and non-glare effects are greatly promoted.

Abstract: An electron gun for a color cathode ray tube includes cathodes, a control electrode and a screen electrode which form a front triode, first, second, third, fourth and fifth focus electrodes which form a plurality of auxiliary electrostatic lenses, and a final accelerating electrode installed adjacent to the fifth focus electrode to form a main electrostatic lens, wherein vertically-elongated electron beam passing holes are formed on the fourth focus electrode, a predetermined focus voltage is applied to the first, second and fifth focus electrodes, a dynamic focus voltage lower than the focus voltage and synchronized with a deflection synchronizing signal is applied to the fourth focus electrode, a static voltage higher than the focus voltage is applied to the second focus electrode, and an anode voltage higher than the focus voltage is applied to the final accelerating electrode.

Abstract: A field emission display FED is manufactured by a method for manufacturing the FED comprising the steps of forming successively a conductive coating and first photoresist coating on a transparent insulating substrate; exposing the first photoresist coating to the light and removing it except a part where a microtip is formed; etching in a predetermined depth the conductive coating using the first photoresist pattern as a mask to form a plurality of columns; depositing an insulating coating on the etched and exposed conductive coating and removing the remaining first photoresist pattern by a lift off method; depositing and patterning a second photoresist coating on the exposed column and the insulating coating to form a second photoresist pattern in order that the thickness of the remaining second photoresist coating becomes smaller than that of the exposed column; etching the column through a selective isotropic or anisotropic etching process using the second photoresist pattern as the mask to form the sharp

Abstract: A manufacturing method for a vacuum fluorescent display is performed by the steps of dividing a substrate into a plurality of areas, and sequentially forming a signal line, an insulating layer, and a segment electrode on each area, arranging common wiring layers with a predetermined distance therebetween on the substrate to be electrically connected to all signal lines formed on the substrate, submerging the substrate into a container filled with a dispersed fluorescent material, and settling the fluorescent material on the segment electrode by applying power to the common wiring layers, and forming rear plates by cutting the substrate having the fluorescent material settled thereon into the plurality of individual areas. A separate settling jig is not required, and cost for the formation of the settling jig and manpower for its handling can be reduced, so that productivity is enhanced.

Abstract: A flat, visible display device includes a backing plate and electrode, cathode wires extending parallel thereto, a face plate with a phosphorescent screen, an anode electrode, and an address plate with first and second addressing electrodes arranged in a crossing matrix pattern to selectively scan electrons. A first accelerating electrode is installed parallel to the same to form a thermal electron output section. Thermal electrons are accelerated to the electric field of the accelerating electrode to which a positive voltage is applied to form a space charge cloud of free electrons between the address plate and the accelerating electrode. The first and second addressing electrodes are selectively supplied with voltage to pass electrons through the apertures of the address plate to form a picture on the screen. The second addressing electrode is supplied with positive voltage, and backing and cut-off electrodes are supplied with a negative voltage to form a preliminary space charge cloud of free electrons.

Abstract: The present invention discloses a filming liquid composition for color Braun tubes comprising deionized water, an acrylic emulsion, ammonium oxalate, ethyl silicate, and titanium oxide, aluminium oxide or a mixture thereof. The color Braun tube manufactured using the filming liquid composition shows the characteristics of high reflection efficiency of the aluminium vacuum evaporation film and excellent luminescent brightness of the color Braun tube.

Abstract: A PDP that includes a crooked discharge path caused by first and second barriers offset from each other, the ends being in contact with each other. Auxiliary anodes are provided on the end of the first barriers facing a front plate. Auxiliary discharge light produced between the second barriers is intercepted by the first barriers forming the crooked discharge path. The PDP improves contrast of picture and is easy to manufacture.

Abstract: An electron gun for a cathode ray tube for condensing the electric beam in a color cathode ray tube having an in-line type electron gun. The electron gun includes at least one floating electrode installed between two predetermined axially neighboring ones of the electrodes, so that the gap between these two predetermined electrodes can be increased. As a result, focusing voltage difference can be greatly reduced and the amount of a spherical aberration can be reduced, thereby improving the resolution of the cathode ray tube.

Abstract: A cathode ray tube includes a plurality of electrode layers which are separately formed in the advancing direction of electron beam, and form a plurality of electrostatic lenses along with corresponding electrodes of an electron gun upon applying voltages of differing potentials. The cathode ray tube has an accelerating electrode layer as an accelerating electrode which forms a main lens with a focusing electrode of the electron gun, and an electrode layer as a prefocusing electrode which forms a prefocusing lens with the focusing electrode and other electrodes, so that the electron beam is accelerated and focused by the electrode layer formed on the inner surface of a neck. The image quality realized on the screen can be improved, while reducing the length of the neck.

Abstract: A cathode-ray tube having an explosion proof band with a reinforced adhesion stability is disclosed. A plurality of projections are formed on the inner surface of the explosion proof band which is preferably concavely formed. Thus, cracking of the CRT can effectively be restrained by the explosion band.

Abstract: A method of preparing a pigment-coated phosphor is provided which comprises the steps of:(a) preparing a pigment dispersion by adding pigment particles in an amount of 0.05 to 10% by weight, based on the amount of phosphor, to one of (i) a solution comprising adipic acid in the range of 0.05 to 2% by weight, based on the amount f phosphor, or (ii) a solution comprising 1,6-hexanediamine in the range of 0.05 to 2%, based on the amount of phosphor, and(b) mixing the pigment dispersion with the other of the solutions not used to form the pigment dispersion and with a phosphor dispersion comprising a phosphor dispersed in distilled water to form a pigment-coated phosphor. A pigment coated phosphor prepared according to this method is also provided.

Abstract: A plasma display device is disclosed having a number of anode pairs disposed on a front panel. Barrier ribs are disposed on the front panel spaced at predetermined intervals. Each anode pair includes odd and even anodes. The odd and even anodes of a given anode pair are partially buried in a corresponding rib.

Abstract: A color cathode ray tube shadow mask assembly includes a panel having a screen; a shadow mask positioned within the panel; a frame supporting the shadow mask; and a self-compensating hook spring which is fixed to the frame within the panel, suspending the shadow mask assembly within the panel, the hook spring including a fixed planar portion welded to the frame, a coupling part for receiving a stud pin, and a connecting part connecting the coupling part with the fixed planar portion, wherein the distance between the planar portion and the coupling part increases with the distance from the connecting part whereby the fixed planar portion of the hook spring welded to the frame is inclined at a predetermined angle relative to the coupling part.

Abstract: A clip for securing an inner shield to a frame of a cathode ray tube having apertures coaxial with one another which comprises a central elastic bent portion shaped to enter the apertures; a pair of first bent side portions extending from the central elastic bent portion and shaped to seat in the apertures when the clip is inserted into the aperture; a pair of second bent side portions extending from respective ones of the first bent side portions and being divergent with respect to each other; a pair of elastic bent portions extending from respective ones of the second bent side portions and being bent outwardly and back toward the pair of first bent side portions; and a pair of elastic grasping portions extending from respective ones of the elastic bent portions essentially parallel with each other and ending at a plane transecting both of the pair of first bent side portions to engage an upper surface of the inner shield when the clip is inserted into the apertures.