Abstract:
Disclosed is a color CRT(Cathode Ray Tube) including a panel having a fluorescent screen formed at an inner surface of the panel. The fluorescent screen includes fluorescent materials of R(Red), G(Green) and B(Blue) colors in the form of strips, and black matrices arranged between the strip-shaped fluorescent materials of R, G and B colors, wherein a BM width from a central portion of the fluorescent screen to end portions in a direction of the shorter axis satisfies the following formula: ynullaxnullb. Here, nullynull represents a BM width in the direction of the shorter axis, nullxnull represents a distance from the central portion of the fluorescent screen to end portion in a direction of the shorter axis, nullanull is defined by the formula null1.932E-4nullanullnull1.420E-4, and nullbnull represents a BM width at the central portion of the fluorescent screen. The present invention has advantages of preventing deterioration of whiteness uniformity caused by a difference in brightness over the screen and also preventing deterioration of brightness uniformity caused by a difference in brightness between the central portion and peripheral portions by enabling a brightness distribution over all regions of the fluorescent screen to be circular-shaped.
Abstract:
X-ray imaging screens utilizing phosphors disposed in microchannels disposed in a plate. This application relates to the nulltilingnull of such microchannel plates to form a larger imaging area and to the use of nullstorage phosphorsnull in the microchannel plates which enables the phosphors to be read out after exposure and from the side exposed to the X-rays. The storage phosphor screens of the present invention provide significantly increased resolution than the prior art storage phosphor screens.
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 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 panel is provided with a substantially rectangular effective portion that has a substantially flat outer surface, and a phosphor screen is formed on the inner surface of the effective portion. A shadow mask that is opposed to the phosphor screen includes a substantially rectangular mask body formed having a large number of electron beam holes and a mask frame supporting the peripheral edge portion of the mask body. The interval between the electron beam holes in the direction of the major axis of the mask body increases from the center of the mask body toward the major axis end so that the rate of change of the interval has a maximum value in the region between the center of the mask body and the major axis end.
Abstract:
A beam index type cathode ray tube having an improved alignment of index stripes, phosphor stripes and matrix stripes. An alignment of the index stripes, the color stripes and the matrix stripes is confirmed during an exposure processing state of the index stripes by using confirming points formed in the screen. An exposed state of the screen is determined by optically testing an alignment of the confirming points and a master screen. On determining that a misalignment exists, the relative positions of the screen and the master screen are adjusted to remove the misalignment.
Abstract:
A display device (1) comprises a display screen (10) which comprises a blue color filter layer (24B) and a blue phosphor (25B). The blue phosphor with or covered by blue pigments.
Abstract:
Picture display device (1) comprising a cathode ray tube (2) whose display screen (4) is provided with parallel image lines (10) along which an electron beam (5) is scanned, and with pairs of first and second phosphorescent index elements extending along opposed sides of each image line (10). The device also comprises a pair of photodetectors (31,32) for generating index signals indicative of the amount of irradiation by the electron beam (5) of said index elements. An error signal is constructed based on a difference of said index signals for correcting the shape and/or the position of the electron beam (5) on the screen. The index signal of one of the photodetectors is indicative of the amount of irradiation of both the first and the second index elements (11, 12), which improves the detection efficiency of said detector and the signal/noise ratio of its index signal. This results in a better error signal and thus in a better image quality.
Abstract:
A distance measuring technology capable of stably and accurately performing distance measurement of an object without any highly accurate focus control mechanism is provided. A distance measuring apparatus has a mask for restricting light so as to pass through two or more different light passing positions; a lens system for focusing the light passed through the mask; an image taking-in means for taking in images from the light focused by the lens system; and a distance calculating means for calculating a distance from an imaging element to an object using the taken-in images. The mask restricts the light so as to pass through only specified positions.
Abstract:
A color cathode ray tube is disclosed, in which brightness is excellent, uniformity of brightness is improved, and characteristics of contrast are improved. To this end, the color cathode ray tube includes a panel (1) having an inner surface on which an electron bean emitted from an electron gun is irradiated and an outer surface exposed outwardly; black matrixes (10) formed at the inner surface of the panel (1) with a predetermined interval; a fluorescent film (20) composed of red, green, and blue fluorescencers among the black matrixes (10); and a black filter film (30) formed at the outer surface of the panel (1), or between the inner surface of the panel (1) and the fluorescent film (20), or between the inner surface of the panel 1 and the fluorescent film (20) with covering the black matrix (10).