Abstract: A lamp air exhausting apparatus is disclosed, which comprises a compression head, a holding assembly, and a securing member. The holding assembly comprises a holder, a flexible tube, a push rod, an eccentric cam and a spring. According to the present invention, a separate exhausting tube is not required, and an electrode can be accurately placed at the center of the lamp.

Abstract: In a method for manufacturing an impregnated cathode structure, cleaning water under high pressure is sprayed onto a pellet with an impregnated cathode material, thereby eliminating residue adhering on the surface of the pellet. By spraying high-pressure cleaning water, a physical force is applied to only the surface of the pellet, thereby dissolving almost all the residue on the surface of the pellet, as well as portions of an electron emitting material. Thus, the electron emitting material existing adjacent to the surface does not become grown over the surface of the pellet during the partial degeneration thereof, and does not cover or damage a metal covering layer composed of at least any one of Ir, Os, Ru, Re, Sc, etc., and formed on the surface of the pellet.

Abstract: The present invention relates to a cathode support structure of an electron gun for a cathode ray tube for improving the electron beam emission characteristics by way of ensuring the support operation of the cathode, whereby upgrading the white balance holding characteristics and preventing the degradation of carbonate. A cathode support structure of an electron gun for a cathode ray tube which is designed to support the cathode support member 2, 2' or 2" using the support strip 3, 3' or 3" between the bead glasses 1 where the support strip 3, 3' or 3" has semicircular curved surface 3a, 3a' or 3a" which encompassing the cylindrical cathode support meber 2, 2' or 2" for secure fixation and having a pair of integral reinforcement strips 4, 4' or 4".

Abstract: A plasma display panel and driving method thereof is disclosed which has an electrical field disturbing means for disturbing and distorting a discharge region in a discharge cell between an anode and cathode. The disturbing means is formed with an auxiliary electrode, thereby having a floating effect on particles in a main discharge region.

Abstract: A DC type plasma display panel wherein a plurality of barriers of a predetermined height are formed parallel to each other within the interval of a predetermined space between the front and rear substrate having one anode embedded in the middle of each barrier and cathodes are arranged on the inner surface of the rear substrate crossing the anodes at right angles avoiding the loss of discharged light due to anode abstraction and realizing higher screen luminance.

Abstract: A convergence correcting magnet assembly means for adjusting the position of plural correcting magnets closer to or further from electron beams in a cathode ray tube, preferably comprising four bipolar magnets arranged in two offset pairs, one pair oriented in the lateral direction and a second pair in the longitudinal direction; the pairs of magnets permit laterally and longitudinally deviating beams to be adjusted or converged toward the center beam. Preferably, each of the bipolar magnets is installed in a clearance space having a spring-loaded or elastic member and an adjusting member, so that the intensities of each magnet can be adjusted by individually moving each magnet closer to or further from the beams under spring tension. Interactions between the magnets are minimized by isolating the magnets from one another.

Abstract: The present invention relates to a focus magnet for a projection type cathode-ray tube where a non-magnetic heat insulating member is disposed between a magnet having a penetrating hole formed therein and a coil wound within the magnet, whereby it can minimize a variation of focusing characteristics of an electron beam due to the heat generated in operation of the projection type cathode-ray tube, and improve a degree of roundness of a coil wound within the magnet.

Abstract: This invention provides a color CRT screen exposing apparatus which collects light very effectively to make the most of the light for exposure and, more particularly, provides an improved exposing apparatus wherein the shape of light source can be easily arranged as desired resulting high and uniform illuminance on the faceplate. For this purpose, this invention comprises a housing with an opening at the center of its top whereon a faceplate for a color CRT is placed, as well as a lamp assembly for producing light, collecting means for collecting the light and a light transmission medium made of optical fiber or acrylate for transmitting the light from the collecting means to the inner surface of the faceplate.

Abstract: A plasma addressed liquid crystal display and manufacturing method thereof is disclosed whose plasma addressing unit has a barrier of a predetermined height between a planar orientation layer and a rear substrate, a second electrode placed in the middle or on the top of the barrier, and a first electrode positioned between the barriers. The electrodes are made of metal paste which enables the use of a screen printing method, thereby facilitating manufacturing and allowing for a large screen display.

Abstract: Described is a process for improving a photo sensitive material of polyvinylpyrrolidone type by improving its chemical and ability to maintain a straight line property even after etching. The present invention proposes such that at least one of a nitrate, a sulfate or a hydrochloride of two or three valanced metal ions is added to polyvinylpyrrolidone in the ratio of 0.01 to 10% and then well stirred with the appropriate amount of an aqueous ammonia at the normal or room temperatures to obtain a pH of 7 to 10 thereby producing a metal hydroxide.

Abstract: A color picture tube is provided with a residue electron removing assembly. The residue electron removing assembly includes a contact spring which is installed between a stud pin and a hook spring connected to a frame. Opposite ends of the contact spring resiliently contact an aluminum layer of a panel and a graphite layer of a funnel, respectively. Assembly supporting pieces and embossing portions on the contact spring grasp the hook spring to support it. With this structure, residue electrons which collide with a shadow mask are discharged through the frame and the hook spring, while residue electrons which collide with a phosphor layer after passing through the shadow mask are discharged through the aluminum layer to the contact spring to the graphite layer and eventually to the outside of the picture tube.

Abstract: A red pigment coated phosphor comprises a phosphor for color cathode ray tube and red pigment attached to said phosphor by an organic binder, wherein said organic binder is gellatin and casein. A process for preparation of a red pigment coated phosphor comprises the steps of: preparing three dispersions of red phosphor particles, red pigment particles and organic binder, respectively; uniformly mixing said three dispersions and agitating them sufficiently; adjusting pH of the mixture obtained; and adding a curing agent thereto, washing said mixture and then drying it. The red pigment coated phosphor of the present invention has a good dispersion and a good affinity for phosphor slurry.

Abstract: A plasma addressed liquid crystal display in which the structure of the plasma address portion is improved is disclosed. In the plasma address portion of the present liquid crystal display, a plurality of independent parallel discharge spaces are formed by the grooves formed on a middle plate, and each pair of second electrodes formed by a screen printing are formed to be opposed on the groove. The liquid crystal display has advantages of easy manufacturing of a low cost.

Abstract: A method for driving a flat-panel display includes an anode and a cathode intersecting each other and right angles, and a sustaining electrode which is a plate or arranged in the same direction of the cathode or anode as strips, in which the output waveform of a sustaining electrode driving circuit is a first pulse having a predetermined period and generated with an amplitude obtained by subtracting a second voltage from a first voltage. The output waveform of an anode driving circuit is a second pulse which is generated with an amplitude obtained by subtracting a fourth voltage from a third voltage when the output waveform of the sustaining electrode driving circuit represents the second voltage, an then maintaining the fourth voltage, while writing only. The output waveforms of a cathode driving circuit is a third pulse which is sequentially generated with an amplitude obtained by subtracting a sixth voltage from a fifth voltage when the sustaining electrode driving circuit represents the second voltage.

Abstract: The present invention provides novel optically-active aliphatic .beta.-halogen substituted carboxylic acid 4'-(4-alkoxybenzyloxy)biphenyl thioester compounds of the general formula: ##STR1## wherein R represents a straight-chained alkyl radical having C.sub.2 to C.sub.10 carbon atoms and X represents a halogen atom, and a process for the preparation thereof. The novel biphenyl thioester compounds provided according to the present invention are usable as a dopant or a base material for liquid crystal blending, thereby improving the properties of LCD.

Abstract: A cathode ray tube with a shadow mask, the shadow mask structure being suspended and fixed behind the panel of the cathode ray tube. Plate springs for connecting the shadow mask structure and the panel are placed to apply pulling forces at either the sides or the corners of the shadow mask frame, so as to firmly hold the shadow mask to the skirt without deforming the shadow mask.

Abstract: A screen electrode of an electron gun is by uniting main electrode with an auxiliary electrode. The main electrode has three circular beam passing holes and a pair of guide holes for insertion in arbors of a jig disposed symmetrically around a center beam passing hole thereof. The auxiliary electrode has three elongated beam passing holes and a pair of guide slots for insertion in the arbors of the jig formed in a top edge and a bottom edge of the auxiliary electrode and coaxially positioned with the guide holes, thereby enabling easy centering of the main and auxiliary electrodes.