Abstract: A color cathode ray tube of the present invention includes an evacuated envelop that is structured from a panel having a phosphor screen on its inner surface, a neck portion containing therein an electron gun assembly, and a cone-shaped section called the funnel for integrally coupling the panel and the neck together, wherein when the main scanning direction of a display screen formed of the panel is defined as an X direction whereas a direction at right angles to the main scan direction is as a Y-direction, an equivalent radius of curvature Rxo of an outer surface of the panel in the X direction is at least 2.6 times greater than an equivalent curvature radius Rxi of the inner surface while forming on the inner panel surface an inside light absorption layer that is comprised of pigments as its principal component.

Abstract: The invention describes a cathode ray tube in which the position of the electron beam (7, 8, 9) is determined in that detection strips (12, 13) are arranged between or below the individual phosphor strips of the phosphor layer (11). The detection strips (12, 13) each comprise a semiconductor component which amplifies the measured current signal. This renders the position determination of the electron beam (7, 8, 9) more definite and reproducible.

Abstract: A color cathode ray tube has a panel portion in which a black matrix layer and plural phosphor layers are formed on the inner surface of its faceplate. The black matrix layer is provided with first-color holes for a first phosphor layer and second-color holes for a second phosphor layer. The first-color holes and the second-color holes become gradually larger in diameter from the central portion toward the corner portions of the faceplate, and the rate of variation in the diameters of the first-color holes and the rate of variation in the diameters of the second-color holes are different from each other. According to the above-described construction, there is provided a cathode ray tube in which white uniformity is improved over the entire screen.

Abstract: A display device includes a display screen, a surface of which is provided with an anti-reflection filter having a conducting layer having metallic particles and transparent areas. The conducting layer is provided with a transparent layer. The transparent layer has a thickness smaller than or equal to the thickness of the conducting layer. The display screen is provided with at least one electrically conducting strip having a metal layer and an adhesive layer provided with electrically conducting particles. The electrically conducting strip is in local electrical contact with the metallic particles of the anti-reflection filter via the conducting particles of the adhesive layer.

Abstract: There is disclosed an image forming apparatus in which electric discharge by a peeled metal back film is prevented. In the image forming apparatus provided with a rear plate having an electron emitting device, and a face plate having a conductive film and a fluorescent layer having fluorescent particles, the conductive film is disposed on the fluorescent layer. When an average thickness of the fluorescent layer is set to d, an average particle diameter of the fluorescent particles is rp, and the thickness of the fluorescent film is D, D−rp≦d≦D+rp is satisfied.

Abstract: Differently sized silicon nanoparticles are used as a phosphor material for cathode ray tubes, field emission displays, or liquid crystal displays. The differently sized particles will emit different light wavelengths, such as red, green, and blue. Thus, the same material can be used for all three phosphors.

Abstract: Flat CRT panel including a substantially flat outside surface, and an inside surface of a fixed curvature, wherein the inside surface of the panel is formed to meet a condition of {(Rh+Rv)/2}×Rd=8.0−10.3, where “Rd” denotes a representative diagonal sectional radius of curvature, “Rh” denotes a representative long-axis sectional radius of curvature, and “Rv” represents a representative short-axis sectional radius of curvature when an effective screen size of the panel is greater than 25″, thereby reducing thermal breakage, and permitting fabrication of lighter panel.

Abstract: A cathode ray tube comprising a panel portion that has a phosphor screen formed over the inner surface of the faceplate 1A. The faceplate 1A is formed such that the radius of curvature Ri of its inner surface 1A1 is almost equal to or larger than the radius of curvature Ro of its outer surface 1A2 and that the black matrix hole transmittivity is defined at a specified level. The cathode ray tube is provided with a simple means which allows the brightness in the peripheral area of the faceplate 1A to match the brightness in the central area and which, even when the deflection angle is large, can reduce the deflection voltage supplied to the deflection yoke and thereby reduce the leakage magnetic field from the deflection yoke.

Abstract: A cathode-ray tube in which an outer surface of a face portion is substantially flat, an inner surface of the face portion is a curved surface convex to the outer surface, and when the axis extending approximately in parallel to a long side through the center of the inner surface is X-axis, the axis extending approximately in parallel to a short side through the center of the inner surface is Y-axis, the radius of curvature of the inner surface along the X-axis is Rx, the radius of curvature of the inner surface along the Y-axis is Ry, the radius of curvature of the inner surface along a long side of a phosphor screen is Rt, the length of a long side of the phosphor screen is H, and the length of a short side of the phosphor screen is V, the following inequalities are satisfied: 1.2H1.3923<Rx<3.00H1.4284,  (1) 1.2H1.3923<Rt<3.00H1.4284,  (2) and 3.0V1.4670<Ry<6.67V1.5453.

Abstract: A technique is described for lightening a shadow of a damper line for preventing vibration of a color selecting member cast on a video screen and further preventing occurrence of the shadow. In a cathode ray tube in which electron beams emitted from neighboring electron guns cross each other before passing through a plurality of apertures of a color selecting member and has an area through which both of the electron beams pass. A damper line is provided in the area through which both of the electron beams pass. Since one of the electron beam falls on a shadow cast by the other electron beam, the shadow becomes lighter.

Abstract: The invention relates to a method for the cooling of a cathode ray tube panel, in which a heat radiation controlling means is provided at a small distance from the panel, on either side of the panel, and parallel to the panel surface. Said means comprises a first area with a high reflectivity for heat radiation, which first area is near the center of the panel, and said means comprises a second area with a high absorption for heat radiation, which second area is near the edges of the panel. The result of this measure during the cooling of a panel is a more even temperature distribution over the surface of the panel. In particular, the temperature gradient between center and edge of the panel is reduced.

Abstract: The present invention provides a flat-panel type color cathode ray tube which has the favorable focusing characteristics and can shorten the total length thereof. The color cathode ray tube includes an evacuated envelope which is constituted of a panel 1 which has a diagonal effective diameter of approximately 51 cm, a neck 3 which houses an electron gun 10 and a funnel 3 which connects the panel and the neck. The electron gun 10 includes a cathode, a first electrode, a second electrode, a focusing electrode and an anode electrode. Assuming the equivalent radius of curvature in the X direction of an inner surface of the panel 1 as Rix and the equivalent radius of curvature in the Y direction of an inner surface of the panel 1 as Riy, the distance Lm between the cathode and a screen-side end portion of the focusing electrode is set to 37 mm≦Lm≦45 mm.

Abstract: An improved resin layer used in the manufacture of cathode ray tube assemblies incorporates inorganic particles in the resin. The resin layer with particles is coated on a CRT screen prior to coating with aluminum film. The resin layer is volatilizable, so that following applying the aluminum film, the screen is baked to drive off the resin. The inorganic particles in the resin layer create an uneven boundary with the screen, so that during baking, volatilized resin in the form of gases can escape from between the aluminum and screen without forming bubbles or causing swelling.

Abstract: A laser CRT includes a vacuum bulb provided with a metal flange, and a laser screen secured in the metal flange and having a laser target mounted on the side of the vacuum bulb. A high-voltage input passes through the wall of the vacuum bulb at a distance from the metal flange, the laser target being electrically insulated from the metal flange and connected to the high-voltage input through an electrically conductive element disposed inside the vacuum bulb. The laser CRT further includes two screening electrodes mounted inside the vacuum bulb in the interspace between the wall of the vacuum bulb, the metal flange, the high-voltage input and the electrically conductive element, the screening electrodes being respectively connected to the high-voltage input and to the metal flange and extending from them towards each other so as to prevent electrical discharges between the metal flange and the high-voltage input and between the metal flange and the electrically conductive element in the interspace.

Abstract: A screen for a cathode ray tube and a method for manufacturing the screen are provided. The screen for a cathode ray tube includes: a phosphor film formed on the inner front surface of a panel where at least one stud pin is mounted, the phosphor film including phosphor layers; a metal layer formed on the phosphor film, which reflects light emitted from the phosphor layers toward the front side of the panel; and a gas exhaust member extended from the metal layer, which provides a path for gas to exhaust, the gas being generated as a filming layer interposed between the phosphor film and the metal layer to make the thickness of the phosphor film uniform is decomposed. To manufacture this screen, a guide block having a mask pattern, which corresponds to a pattern of a metal layer and gas exhaust member to be formed as a single body inside the panel on which the phosphor film and a filming layer have been formed, is fitted into the panel.

Abstract: In a color cathode ray tube, a rectangular panel has a slightly convex outer face with a large radius of outward curvature so as to be almost flat and a concave inner face which satisfies the conditions 0.98<Rh/Rd<1.02, 0.95<Rv/Rd<1.04, 0.98<Rt/Rh<1.02, and 0.98<Rs/Rv<1.05, where Rd is the radius of diagonal curvature along a screen effective surface area, Rt is the radius of a long side peripheral curvature, Rs is the radius of a short side peripheral curvature, Rh is the radius of curvature along the x-axis passing through a center of the screen effective surface area and parallel to the long side, and Rv is the radius of curvature along the y-axis passing through the center of the screen effective surface area and parallel to the short side. Accordingly, distortion of a picture can be minimized by designing the internal curvature of the panel as an optimum shape, and a high picture quality can be obtained.

Abstract: The invention relates to a method for press-forming a cathode ray tube panel, in which, before the panel is removed from the press, a heat radiation controlling means is provided at a small distance from the panel, parallel to the panel surface. Said means comprises an area with a high reflectivity for heat radiation, which first area is near the center of the panel. The result of this measure during the cooling of a panel is a more even temperature distribution over the surface of the panel. In particular, the temperature gradient between center and edges of the panel is reduced.

Abstract: A CRT has an improved contrast with a provision of a filter layer where nano-sized metal particles are dispersed in a dielectric matrix to selectively absorb light in predetermined wavelengths, specifically wavelengths between peak wavelengths of primary colors emitted by phosphors coated on the inner surface of the face plate. The improved contrast is a result of the metal particles in a dielectric matrix resonating with particular wavelengths and thus absorbing them.

Abstract: A viewing screen (100) for a display device (115) includes a glass substrate (110) having a thermal coefficient of expansion within a range of 3.5×10−6−4.5×10−6° C.−1. Viewing screen (100) further includes a black matrix (111), which is affixed to glass substrate (110), and which includes a black surround, a ductile metal, and lead titanate.

Abstract: An effective portion of a panel of a vacuum envelope has a substantially rectangular, nearly flat outer surface, and a phosphor screen is formed on the inner surface of the effective portion. An effective surface of a shadow mask that is opposed to the inner surface of the effective portion is in the form of a curved surface projecting toward the phosphor screen. The effective surface is formed so that there are relations: 1>RVmin/RVmax≧0.3, where RVmin and RVmax are minimum and maximum values, respectively, of the minor-axis-direction curvature radius of the effective surface on the minor axis, and 1<RHC/RHA≦3, where RHA is the average major-axis-direction curvature radius of the effective surface on the major axis, and RHC is the major-axis-direction curvature radius in the center of the effective surface.

Abstract: A CRT panel glass and a CRT wherein a surface treating film is formed on an outer surface of a CRT panel so that overall transmittance distribution and reflectance distribution within an effective picture plane satisfy specific mathematical expressions, whereby, even with a flattened panel glass, brightness and contrast are uniform over the entire surface of the image display plane, and their production method.

Abstract: The outer surface of a panel effective section of a vacuum envelope is substantially flattened. A phosphor screen is formed on the inner surface of the effective section and includes stripe-shaped phosphor layers and light absorption layers arranged in parallel. The panel effective section is formed such that a corner portion is 8 mm to 15 mm thicker than the central portion and the transmittance of the central portion is set at 40% to 60%. The phosphor screen is formed such that the ratio of the width of a light absorption layer to the pitch of phosphor layers in the central portion of the panel effective section is larger than or equal to that in the peripheral portion thereof. A shadow mask is opposed to the phosphor screen and has a mask body in which a number of electron beam passage apertures are formed. The pitch of apertures formed in the peripheral portion of the mask body is 1.3 to 1.4 times as large as that of apertures formed in the central portion thereof.

Abstract: A low excitation voltage luminescent phosphor screen structure is presented applicable to vacuum visual displays and other devices. The phosphor grains utilized in the luminescent screen are strongly bonded with molecular colonies of conductive metal oxide, which allows for the deposited layers of these phosphors to be excited to luminosity at significantly lower voltages than were previously possible. Also presented are methods for production and increasing the quality and control of low cost mass production of such luminescent screens with no toxic gas emission.

Abstract: A cathode ray tube includes a faceplate panel having a substantially flat exterior surface and a substantially concave interior surface, and a phosphor screen formed on the interior surface of the faceplate panel. The phosphor screen has a horizontal axis, a vertical axis and a diagonal axis. A length from a central portion of the phosphor screen to a point where a vertical side line of the phosphor screen intersects the horizontal axis is less than a length from the central portion of the phosphor screen to a point where the vertical side line intersects the diagonal axis.

Abstract: Color CRT having a rectangular panel with an outer surface with a radius of curvature greater than 30,000 mm, an inner surface with a fixed curvature, and a skirt extended substantially perpendicular to the inner and outer surfaces, and a funnel connected to a skirt seal edge part of the panel, to meet conditions of 0.18≦OAH/(USD/2)≦0.

Abstract: The invention relates to image display screens using a cell matrix to form an image. More particularly, the invention relates to means for facilitating relative positioning of various elements during manufacturing. The inventive screen consists of at least two electrode networks. One of the characteristics of the invention is that at least one of said networks consists of “variable direction” electrodes which are shaped in such a way that they spread out and then return towards their longitudinal axis to intersect and pass alternatively from one side to the other of said axis. The spread of a variable direction electrode in relation to the longitudinal axis has an amplitude depending on the position of the electrode in respect to a reference position. This arrangement provides appropriate dimensional leeway to facilitate superpositioning of several masks of varying dimensions. The invention is used in “flat screens”, specially plasma panels.

Abstract: To provide a flat panel type color cathode ray tube which has a favorable feeling of flatness and can improve the drop strength of a shadow mask, a curvature along a diagonal direction of an outer surface of a panel 1 approximates to flat, an equivalent radius of curvature Rox along an X axis on the outer surface of the panel 1 is made smaller than an equivalent radius of curvature Roy along an Y axis on the outer surface of the panel 1 and an equivalent radius of curvature Rix along the X axis on an inner surface of the panel 1 is made larger than an equivalent radius of curvature Riy along the Y axis on the inner surface of the panel 1. Further, the optimum value of a ratio between the equivalent radius of curvature along the Y axis on the inner surface of the panel 1 and the equivalent radius of curvature along the X axis on the inner surface of the panel 1 is set to fall within the range of 0.7<(Riy/Rix)<1.0.

Abstract: Disclosed is a color CRT(Cathode Ray Tube) including a panel having a fluorescent screen formed at an inner surface of the panel.

Abstract: In a glass panel for cathode ray tube of which effective screen diameter D along the diagonal axis of the glass panel is more than or equal to 500 mm, and average radius of curvature of an outer surface of a face portion 11 is more than or equal to 10,000 mm, when a distance h along a tube axis from a contact between an effective screen end of an inner surface of the glass panel and a blend R portion 12 to a seal edge surface 14 is defined as a length of a skirt portion 13, and a glass wall thickness of the seal edge surface 14 of the skirt portion is defined as t, ranges of h and t are specified by ratios with respect to the effective screen diameter D, and a product of h and t is also specified to satisfy a predetermined range in relation to the effective screen diameter D.

Abstract: A panel for a flat screen type CRT includes an internal curvature portion wherein a screen effective surface is formed, and a skirt portion extended rearwardly from an edge of the internal curvature portion. Where Rs is the radius of curvature at an inner side of a corner of a seal edge portion in the skirt portion and Rx, Ry, and Rd are respectively the radii of blend curvature of a long-side portion, a short-side portion and a corner portion in a part where the internal curvature portion and skirt portion meet, the relations 0.4<Rd/Rs<0.6, 1≦Rx/Rd≦4, and 1≦Ry/Rd≦2 are satisfied, whereby the size of the screen effective surface area can be increased compared to that of a CRT of the same size.

Abstract: A vacuum envelope for cathode-ray tube comprises a panel having a flat outer surface and a convex curved inner surface, and a substantially rectangular fluorescent screen (14) with an aspect ratio of M:N is formed in this inner surface. In the inner surface of the panel (12), the gaps &Dgr;H(r), &Dgr;V(r), and &Dgr;D(r) from the center on the horizontal, vertical and diagonal axes of the fluorescent screen (14) are determined in a specific relationship. By forming a proper curved surface in the inner surface of a panel (12) whose outer surface is a flat surface, the strength of the vacuum envelope is maintained, deterioration of visual recognition of flatness is suppressed, and, in the color cathode ray tube, the workability of the shadow mask is further enhanced.

Abstract: A structured lighting material, an illuminator, and the method to generate incoherent luminescence wherein luminescent intensity increases superlinearly when excitation energy applied thereto through electron beam, electric charge, electric field or the like exceeds a threshold. In the present invention, the structured lighting material is easily made to have a minute uneven surface. This invention enables high-efficient lighting devices, sensors and memories owing to the superlinearity.

Abstract: A color cathode ray tube is provided having a shadow mask or screen designed to an optimum state or whose panel's light absorption coefficient is set to an optimum value even if the panel has a high wedge ratio, thereby obtaining excellent bright uniformity characteristics. The color cathode ray tube includes a panel with a wedge ratio of more than 170%; a screen onto which electronic beams are scanned and on which fluorescent dots coated with RGB fluorescent materials and a black matrix layer filled with a black coating material throughout all the regions except for the fluorescent dots are formed; and a shadow mask on which a plurality of slots are arranged corresponding to the fluorescent dots, wherein the dot diameter at the corner portion of a screen is larger than that at the center portion by about 100-127%, the slot width at the corner portion of a shadow mask is larger than that at the center portion by about 105-133%.

Abstract: A vacuum envelope for display which reduces a stress and a deflection in a screen area of a panel face portion and has a light weight and which is suitable for a cathode ray tube or a field emission display, wherein the screen area is composed of a complex layer member comprising a glass layer as an inner layer and a transparent resin as an outer layer, and the proportion of the Young's modulus of the transparent resin to the Young's modulus of the glass layer is {fraction (1/10)}-⅕.

Abstract: A color cathode ray tube includes a panel having an outer surface which is flat and an inner surface which is a curved surface, and the inner surface has an approximately rectangular effective screen on which an image is to be displayed. Letting Tc, Td and D be, respectively, the glass thickness of the panel at the center thereof, the glass thickness of an end of a diagonal effective diameter, and half of the diagonal effective diameter, (Td−Tc)/D≦7.5% and the maximum deflection angle is between 96° and 99°.

Abstract: A cathode ray tube includes a panel having a substantially flat outer surface and an inner curved surface with a phosphor screen. The panel has a substantially rectangular effective screen portion with two long sides parallel to each other, two short sides parallel to each other and four rounded edges interconnecting each long side and the neighboring short side. The effective screen portion is structured such that a first line V1 interconnecting centers of the long sides, a second line H1 interconnecting centers of the short sides and a third line D1 interconnecting centers of the rounded edges opposite to each other meet at a point. The effective screen portion has a first thickness Tv at the centers of the long sides, a second thickness Th at the centers of the short sides, a third thickness Td at the centers of the edges and a fourth thickness Tc at the meeting point of the all three lines V1, H1 and D1.

Abstract: A viewing screen (100) for a display device (115) includes a glass substrate (110) having a thermal coefficient of expansion within a range of 3.5×10−6−4.5×10−6 °C.−1. Viewing screen (100) further includes a black matrix (111), which is affixed to glass substrate (110), and which includes a black surround, a ductile metal, and lead titanate. A method for fabricating viewing screen (100) includes the steps of: adding to a black surround paste a ductile metal paste, adding to the black surround paste lead titanate particles, depositing the black surround paste on glass substrate (110), and heating the black surround paste and glass substrate (110) to affix the black surround paste to glass substrate (110), thereby forming black matrix (111). The ductile metal paste and lead titanate particles are added in amounts sufficient to realize an extent of cracking in black matrix (111) upon repeated heating to a temperature within a range of 450-600° C.

Abstract: A nonspecular reflective visual display having a plurality of display elements with a substantially thin conformal layer of encapsulation material placed on a surface of the display elements. The conformal layer of encapsulation material diffusely reflects light incident upon the display, thereby eliminating glare.

Abstract: A resonant microcavity display (20) having microcavity with a substrate (25), a phosphor active region (50) and front and rear reflectors (30 and 60). The front and rear reflectors may be spaced to create either a standing or treaveling eledtromagnetic wave to enhance the efificenty of the light transmission.

Abstract: There is provided a cathode-ray tube including an envelope having a neck, a funnel and a panel fused to the funnel by using frit glass, the outside of the panel being near flat, the inside of the panel having a predetermined curvature, in which 1.7≦T2/T1≦2.3 when T1 is the thickness of the center of the panel and T2 is the thickness of the diagonal corner of the panel, and a panel inside tensile stress at the fused portion of the panel and funnel is less than −1.3876x+128.24 (Kgf/cm2) when the size of the effective picture area of the cathode-ray tube is x(unit: cm). The panel inside tensile stress at the fused portion of the panel and funnel is maintained below a predetermined value to mitigate breakage inside the furnaces that occurs when the cathode-ray tube having the panel whose outside is near flat and whose inside has a predetermined curvature is reproduced, thereby improving the salvage rate.

Abstract: Color picture display device comprising a cathode ray tube and a deflection unit. The picture display device comprises compensation means for compensating picture errors. The compensation means is arranged on a side of a deflection unit facing the display screen and comprises four magnet systems which are arranged fourfold symmetrically with respect to the tube axis and extend through an angle &agr; ranging between 24 and 34 degrees or between 40 and 48 degrees.

Abstract: Semi-flat CRT panel having relations of Ryi<Rdi<Rxi and 2×Ryi<Rxi, where Rxi denotes an inside surface horizontal curvature, Ryi denotes an inside surface vertical curvature, Rdi denotes an inside surface diagonal curvature for a CRT with an aspect ratio of 4:3 and an outside surface diagonal curvature Rd is greater than 30,000 mm, whereby securing a strength of the semi-flat CRT panel, eliminating a distortion of image, and reducing reflection from an external light.

Abstract: A display screen may be formed with a moth-eye like array of elements of sufficiently small size to reduce glare from ambient light while passing outbound image light substantially unaffected. The screen may be used in direct view and projection displays.

Abstract: A display device having a surface treating film formed on the outer surface of a substrate of the display device, said surface treating film having a property of changing light transmittance or refractive index by light or UV rays, and/or containing a compound which can be deposited by irradiation with light, shows excellent antireflective antistatic properties and low surface resistance, and can be applied to flat cathode-ray tubes.

Abstract: According to the present invention, in the cathode-ray tube comprising a plurality of electron guns, the distance between the color-selection mechanism and the fluorescent substance screen can be made proper and the respective color fluorescent layers of the color fluorescent screen can be regularly disposed with an equal interval. Accordingly, it will be possible to display an image of high quality. Moreover, the fluorescent screen can be manufactured with ease.

Abstract: Cathode venting for electron guns is improved by forming one or more vent holes around the apertures in the triode and any pre-focus lens. This configuration places the vent holes next to the active area of the cathode and provides a line of sight from the cathode to the funnel. If separate alignment holes are used to protect the aperture, one or more vent holes are provided in addition to the alignment holes. The pattern of vent and alignment holes is preferably rotationally symmetric about the aperture so that they do not effect the beam.

Abstract: A projection tube has a phosphor-coated faceplate at one end of a vacuum envelope and a plural-beam providing electron lens structure at the opposite end thereof. The electron lens structure includes four electrodes having axially-aligned apertures defining parallel channels for the plural electron beams to pass through to be focused and converged onto a small spot on the faceplate. The first and second electrodes of the electron lens structure shape the electron beams and the third and fourth electrodes thereof converge and focus the electron beams toward the same location on the faceplate. The potential applied to the fourth electrode is at or close to the potential at the phosphor, and is substantially higher than the potential applied to the third electrode. The lens structures of the third and fourth electrodes may each include an inner electron lens structure and an outer electron lens structure.

Abstract: Disclosed is a CRT panel. The panels includes a display portion defining a distal end of the panel; a curved lateral wall extending from the display portion toward a funnel of the CRT, ends of the lateral wall being joined to the funnel; a phosphor screen formed on an inside surface of the display portion, the phosphor screen including RGB phosphor pixels and a black matrix layer between the RGB phosphor pixels; and light transmittance compensating means for compensating for differences in brightness of the phosphor screen. The light transmittance compensating means is provided on an outside surface of the display portion and has varying levels of light transmittivity over its surface.

Abstract: A panel defining a front exterior of a cathode ray tube has an inner surface overlaid with a phosphor screen, and an outer surface overlaid with a tinted coating layer, wherein the tinted coating layer varies light transmission at the center and the periphery of the panel by being dark at the center and gradating brighter toward the periphery thereby preventing a difference in brightness of the panel between the center and the periphery thereof due to incremental growth in the volume of a black matrix and in the thickness of the panel toward the periphery.

Abstract: A color picture tube is disclosed, that comprises an outer sheath having a electron gun, the outer sheath being airtightly sealed, a face plate having light transmissivity and disposed on the front surface of the outer sheath, and a large number of red, blue, and green pixels regularly arranged inside the face plate, wherein the pixels have a fluorescent substance layer and a color filter, the fluorescent substance layer being lit by a radiation of an electron beam, the color filter being disposed between the fluorescent substance layer and the face palate, and wherein green pixels have a chromaticity that is plotted in the fourth quadrant of a coordinate system of a (L*a*b*) color system where a* is the horizontal axis and *b is the vertical axis when light of a standard light source C is reflected on the outside of the face plate.