JP2701023B2 - Color display - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a color display device. (Prior Art and its Problems) Conventionally, in displaying a color, a desired color is displayed by irradiating three electron beams corresponding to three primary colors to three parts using a shadow mask or the like. For this reason, the three beams must be made to exactly coincide with the aimed irradiation part, and the mechanism for that purpose is complicated, and realizing high-definition display is not practical and has limitations. The present invention is directed to solving such a problem. (Means for Solving the Problems) In order to achieve the above object, the present invention provides a fluorescent screen having luminescent materials corresponding to at least three primary colors, three or more superposed filter plates each having an appropriate potential applied thereto, It consists of a through hole formed in any one of the filter plates corresponding to each luminous body, and is arranged such that one electron beam can be irradiated on the phosphor screen through the superposed filter plate to obtain a desired light emission. By applying an appropriate potential to a filter plate having a through hole corresponding to the body and changing the resistance value of the filter plate, the luminous body is colored to display a predetermined color. Hereinafter, the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 1 denotes a through hole formed in a filter plate 2 for reducing the transmission amount of an electron beam. Assuming that the resistance R11 of the filter plate 2 and the resistance of the through hole 1 to the electron beam are R12, since the resistance of R11 is smaller than the resistance of R12, the electron beam passes through the through hole 1 more. If the resistance increase of the filter plate 2 itself when applying a potential to the filter plate 2 is Δr13 and the resistance increase of the through hole 1 is Δr11, Δr11 is smaller than Δr12. In FIG. 2, the filter plate shown in FIG. 1 is assembled by combining three filter plates corresponding to the three primary colors. In this case, only the through holes 4, 6, 8 formed in the three filter plates 3, 5, 7 are shifted from each other so that they do not overlap. In this combination, when calculating the combined resistance when the potential is applied only to the filter plate 3, the overlapping portion of the through-hole 4 is R11 + Δr11 + R12 + R12 The overlapping portion without the through-hole 4 is R12 + Δr12 + R12 + R12. The resistance of the overlapping portion having no through hole is smaller than that of the portion having no through hole 4. By adjusting the intensity of the beam so that the electron beam does not leak from the portion 4 of the through hole 4 or adjusting the level of the potential applied to the filter plate, an electron beam is emitted only from the through hole 4 and a predetermined Only the light emitter 9 can be colored (emitted). Similarly, only the light emitter 10 can be colored by applying a potential only to the filter plate 5, and only the light emitter 11 can be colored by applying a potential only to the filter plate 7. The brightness of the phosphor screen having the luminous body can be easily adjusted by adjusting the intensity of the emitted electron beam and the level of the potential applied to the filter plate. In addition, the phosphors 9, 10, and 11 on the phosphor screen are placed in correspondence with the three primary colors. If the filter plate giving the color is switched quickly and appropriately, a desired color can be expressed by the afterglow effect of the eyes. That is, according to the present invention, a desired color can be expressed by one electron beam. Based on the above principle, by increasing the number of through holes in the filter plate and arranging them uniformly, a higher definition color can be obtained, and the number of filter plates can be further increased to emit more than three primary colors on the phosphor screen. By using the body, it is possible to display a wide range of colors that could not be expressed conventionally. In the above embodiment, the light emitting body on the through-hole or the phosphor screen is circular, but is not limited to this, and may be set to an appropriate shape. (Effect of the Invention) In the present invention, it is not necessary to use three electron beams as in the related art, and only one electron beam is sufficient. Therefore, the display control is simplified without being adversely affected by other beams. . Also, since the luminous body of the phosphor screen is located on the extension of the electron beam and the through hole of the filter plate, the beam can reliably catch the luminous body, and the so-called “color shift” which has been regarded as a problem in the past is reduced. Can be eliminated. Furthermore, by increasing the number of through-holes in the filter plate and arranging them uniformly, a higher definition color can be obtained than before, and the number of filter plates can be increased to emit more than three primary colors on the phosphor screen. If the body is used, colors and the like that could not be displayed conventionally can be displayed widely.

[Brief description of the drawings] BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a perspective view of a filter plate, FIG. 2 is a conceptual diagram showing the configuration of the present invention. 1 ... through-hole, 2 ... filter plate 3 ... Filter plate, 4 ... Through hole 5: Filter plate, 6: Through hole 7: Filter plate, 8: Through hole 9 Light-emitting body (fluorescent screen) 10 ... Light-emitting body (fluorescent screen) 11: Light-emitting body (fluorescent screen), 12: Electron beam

Claims (1)

(57) [Claims] It consists of a filter with a through-hole corresponding to the color, a luminous body corresponding to the color, an electron beam for coloring the luminous body, and a negative potential applied to the filter so as to change the transmission amount of the electron beam. It is arranged so as to transmit through three or more filters having mutually shifted through holes so as to emit three primary colors or more, and to irradiate light emitters of three primary colors or more. A color display device characterized in that an electron beam is prevented from leaking to a luminous body of a desired color and a desired color is produced.