Abstract: A cathode ray tube according to an embodiment of the present invention includes a panel having an effective screen; a funnel connected to the panel; and an electron gun to generate electron beams. The effective screen has a horizontal and vertical ratio of 16:9; and the panel satisfies a condition: [(?y/d)×100)?5.65, wherein d is length from a central point G to a diagonal vertex E of the effective screen, and ?y is length from a point H to an intersection point of the outline of the panel and the shorter axis Y, the point H being intersection of shorter axis Y and a longer side of the effective screen.

Abstract: A color cathode ray tube is capable of reducing a rate of cracks in a furnace and improving the productivity of the CRT by improving a structure of a seal edge of a skirt of a panel. A color cathode ray tube according to the present invention includes a rectangular panel having a substantially vertically extending skirt on inner and outer surfaces of the panel and a funnel coupled to a seal edge of the skirt of the panel. The seal edge of the skirt of the panel has a corner having a specific curvature between a seal surface and a side of the skirt, and the following relationship is satisfied: 0.6 mm<W<1.0 mm, where W is the shortest distance from a starting point on the seal surface of the corner to an extension plane of the side of the skirt.

Abstract: Dynamic vibration absorber in a CRT having a shadow mask fastened to an inside surface of a panel by main frames, including a base part to be fitted to a non-effective surface of the shadow mask, and a vibration absorbing part having one end connected to the base part and the other end designed to make no contact with the shadow mask and the main frame, thereby attenuating vibration of the shadow mask.

Abstract: Disclosed herein is a color cathode ray tube which optimizes the structure of a glass panel and funnel to achieve weight reduction thereof. In the color cathode ray tube, a curvature radius of an outer surface of the panel is in a range of 5000 mm to 100000 mm, and the panel is configured to satisfy an expression: 1.0?(OAH*CFT)/USD?1.5, where, OAH is a distance from the outer surface of the panel to a sealing surface between the panel and the funnel, USD is a diagonal length of an effective screen of the panel, and CFT is a thickness of a central region of the panel. The cathode ray tube of the present invention has the effects of reducing manufacturing costs through weight reduction thereof, of lowering the degree of breakage during a heat treatment step included in a manufacturing process of the cathode ray tube, resulting in an improved yield, and of effectively intercepting X-rays generated during operation thereof.

Abstract: The present invention provides a color cathode ray tube having a shadow mask for selecting colors, wherein the shadow mask satisfies the relation: 5.5 < Rh ( H 2 ) < 8.0 , where Rh is a mean curvature radius in the direction of the long axis of the shadow mask, H is a distance between both ends in a direction of a long axis of an effective surface of the shadow mask, and a mean curvature radius in the direction of the long axis satisfies the condition: Rh = ( H 2 ) 2 + Zh 2 2 * Zh where Zh is a recess amount in a direction of a tube axis at an end of the long axis of the effective surface with respect to a center of the effective surface.

Abstract: Disclosed is a color flat panel display comprising a rear glass, a rear electrode, a filament cathode for emitting electrons, a control electrode, a signal modulation electrode, a focus electrode, a horizontal deflection electrode, a vertical deflection electrode, a front glass on which a phosphor screen is formed, and a spacer for maintaining an interval between the electrodes, wherein the spacer is plate-shaped and has a space part through which electron beams pass at an inside of thereof.

Abstract: A rectangular-shaped deflection yoke, RTC (Round Core Tetra Coil Combined Deflection Yoke) enhances deflection sensitivity of a cathode-ray tube. More specifically, a deflection yoke structure for a cathode-ray tube is mounted with rectangular shaped deflection coils and circular shaped ferrite cores, and the difference between a maximum gap and a minimum gap for the deflection coil and the ferrite core is greatest at an end section on a screen side of the ferrite core.

Abstract: A cathode ray tube is provided, and more particularly, a cost-effective cathode ray tube effective for minimizing deterioration of color purity and obtaining a sufficient margin for a beam strike neck (BSN) phenomenon by moving a ½ center (deflection center) closer to a panel without changing the curvature of a funnel or the thickness of a glass inside the funnel.

Abstract: A cathode ray tube comprises a panel; a funnel engaged to the panel for forming a vacuous space; and a shadow mask supported in the cathode ray tube by being fixed to a mask frame and including an effective surface having a plurality of electron beam passing holes at a center thereof, an ineffective surface formed at a periphery of the effective surface and not having the electron beam passing holes and a skirt portion extended from the ineffective surface towards a vertical direction thereof and welded to the mask frame. In the cathode ray tube, a slot of a predetermined size is formed between welding points by which the skirt portion is welded to the mask frame, and a height of the slot from an end of the skirt portion is higher than a height of the welding points, thereby reducing a doming effect of the shadow mask, reducing a mis-landing which the electron beam does not land to a precise landing point, and thus preventing a color purity of a screen from being deteriorated.

Abstract: A structure of a slot feature for a shadow mask in which, on the assumption that the width at the point of ½ in a vertical direction in the feature of slots of the shadow mask is ‘Sw’, horizontal distances from a virtual vertical line passing an apex of a concave portion of a slot at a marginal portion to a protrusion portion formed at both upper and lower sides on the basis of the width Sw line are ‘M’ and ‘N’, and angles inclined in the direction of the protrusion portion from the virtual straight line passing the apex of the curved protrusion portion formed at the opposite side of the concave portion are ‘P’ and ‘Q’, there are at least one and more mask slot satisfying a formula of M>0, N>0, P>0°, Q>0°. The shape of electron beams by positions on the screen are identical to each other, and the shape of electron beam at the left and right sides of marginal portion can be maintained in a straight line in the vertical direction.

Abstract: A color cathode ray tube comprising a panel having a substantially flat outer surface, a funnel mounted on a rear side of the panel, a shadow mask including a plurality of electron beam through holes, and a mask frame for supporting the shadow mask, said mask frame satisfying the following condition: d/v?0.9, d/h?0.9 wherein d is a height of a center of a diagonal portion of the mask frame, h is a height of a center of a short side portion of the mask frame, and v is a height of a center of a long side portion of the mask frame.

Abstract: In a color cathode ray tube, by optimizing an outer radios of curvature, an inner radius of curvature on a corner portion, a thickness of a long side, a thickness of a short side, a thickness of the corner portion, the total length of the panel, the total length of the funnel body and the total length of a yoke portion of the funnel determining a section shape of the yoke portion of the funnel, a stress concentrated on the yoke portion can be lowered. In addition, according to the increase of an inner radius of curvature of the corner portion of the yoke portion, a crash phenomenon of an electron beam is decreased, and an impact resistance and productivity improvement in fabrication process can be secured by lowering a high stress occurrence on the funnel in vacuum.

Abstract: The present invention relates to a field emission display using a gated field emitter and a flat electrode that is applied to a Cathode Ray Tube (CRT). The present invention does not need a spacer unlike the related invention and so the problem resulting from a mounting of the spacer is solved, and the structure of its whole panel and its fabrication process are simplified, thus improving its productivity and decreasing its fabrication cost.

Abstract: A mask frame assembly in a cathode ray tube is capable of minimizing a howling phenomenon and preventing local wrinkles of a shadow mask by optimizing positioning of compression of the mask frame assembly. A mask frame assembly for applying optimal tension in a cathode ray tube includes a shadow mask for selecting color and a frame assembly having a main frame for applying tension to the shadow mask and a sub-frame for supporting the main frame, wherein each of compression points of the main frame is set to satisfy the following expressions, (L/2)×0.38?X1?(L/2)×0.52, and (L/2)×0.80?X2×(L/2)×0.98, where L is a length of a long side of the main frame, X1 and X2 are distances from the center of the main frame to each of compression points P1 and P2 in both sides.

Abstract: A cathode ray tube includes a panel, a funnel and a funnel yoke portion having a non-circular-shaped vertical section. When a diagonal portion thickness on a certain vertical section between a reference line and a neck line is Td and a long side portion thickness at the same vertical section is Th, a glass structure of a cathode ray tube satisfies 0.5<Th/Td<1.01. When a diagonal portion thickness at a top round is Dt?, a long side portion thickness is DS?, a short side portion thickness is DL?, a diagonal portion thickness at a reference line is Dt, a long side portion thickness is DS, and a short side portion thickness is DL, then the glass structure of a cathode ray tube satisfies 1.3?Dt?/Dt<1.80.

Abstract: A color cathode-ray tube has an optimum funnel structure so that it has a slim tube structure while reducing stress caused by its internal vacuum pressure. The color cathode-ray tube satisfies a relation of 0.12×L?<S<0.27×L? where “L” represents a length from a seal line, where a panel and a funnel are sealably coupled together, to a yoke line of the funnel in an axial direction of the tube, “L?” represents ½ of the length of the seal line, “A” represents ½ of a seal stress adjustment line formed by connecting points spaced apart from the seal line by a distance of “L×0.67” toward the yoke portion, and “S” represents a difference between “L?” and “A”. The cathode-ray tube of the present invention has an optimum funnel structure capable of providing an effect of reducing the high stress conventionally generated around the seal line and yoke line by 25% and 53%, respectively.

Abstract: Disclosed is a color flat-panel display, which includes a rear glass, a rear electrode, a filament cathode for emitting electrons, a control electrode, a signal modulation electrode, a focus electrode, a horizontal deflection electrode, a vertical deflection electrode, a front glass on which a phosphor screen is formed, and spacers for maintaining an interval between the electrodes. Each electrode member of the control electrode, the signal modulation electrode, the focus electrode, the horizontal deflection electrode and the vertical deflection electrode includes an insulator and a conductive layer formed on a surface of the insulator and acting as an electrode.

Abstract: A panel for a cathode ray tube having an inner surface with predetermined roughness, including a plurality of black matrix layers formed on the inner surface and a phosphor layer composed of red, green and blue phosphors between the black matrix layers, and the phosphor layer and the black matrix layer are formed on the inner surface of the panel after forming a transparent dielectric film, can prevent degradation of brightness and color purity of a screen caused as a result of grinding process which gives roughness to an inner surface of the panel in order to prevent mirror surface reflection on the inner surface of the panel caused by external light.

Abstract: A color cathode ray tube capable of improving the luminance attenuation characteristic and the explosion-proof characteristic through an improved shape of a panel is disclosed. In an equation F=Rdo/(Sd H 1.767), F>21, Tc/CFT?1.35, and Rdi>(Ryi or Rxi) are satisfied, wherein Sd is a length of a diagonal effective picture of the panel, Rdo is a curvature radius of a diagonal outer surface, Ryo is a curvature radius of a vertical outer surface, Rxi, Ryi and Rdi are a horizontal, vertically and diagonal curvature radius, respectively, CFT is a thickness of a center portion, Tc is a thickness of a diagonal end of the effective surface, F is a planarizing rate of the outer curvature.

Abstract: A shadow mask for a color cathode-ray tube including a first portion on which a plurality of electron beam through holes are formed; and a second portion on which no electron beam through holes are formed, the second portion surrounding the first surface portion, wherein each of the plurality of electron beam through holes includes an electron beam exit hole, each of the electron beam exit holes of electron beam through holes formed at a periphery of the fist portion near the second portion having a first length Dh in a direction facing away from the center of the shadow mask that is greater than a second length Dv perpendicular to the direction facing away from the center of the shadow mask. Therefore, a vibration generated on the shadow mask is attenuated within an elastic range of shadow mask, and thereby the shadow mask is able to endure an external shock and a permanent distortion to the shadow mask can be prevented to ensure color purity of the color cathode-ray tube.