JPS5994344A - Color display device - Google Patents

Abstract

PURPOSE:To make a high-fidelity color reproduction securable irrespective of a deflecting direction of electron beams, by arranging red phosphor strips at both sides of an electron beam position in time of nondeflection in a horizontal direction, in a symmetrical position as well as forming each phosphor stripe of red, green and blue into an equal pitch. CONSTITUTION:A position P on a phosphor screen of electron beams in a horizontal direction is set down to a zero position, then each of red phosphor positions 20 and 20' in both + and - directions is made to be symmetrical to this zero position and further formed into a phosphor configuration where each pitch of these three-primary colored phosphors 20, 21 and 21... is equally installed. Figure A shows a case that the horizontal deflection range of one electron beam is of an even picture element while figure B shows an example in case of an odd picture element. Like this, for these electron beams in time of nondeflection, red phosphor stripes 20 and 20' are arranged in symmetrical positions whereby each red phosphor irradiating beam diameter in every deflecting direction comes equal to each other, and a degree of color saturation to a red color to which eye's perceptive characteristic is most sensitive becomes equalized so that color reproduction is sharply improved.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a color display device used in color video display devices such as color television receivers and computer terminal displays.

Conventional Structures and Problems A typical color display device for displaying color images is a color picture tube of the Nyadou mask type. Although these picture tubes have recently come to display extremely clear color images, major problems remain. The reason is that it has a long depth, and that it cannot be made larger than 40 inches. For this reason, alternatives to this are being considered, such as those that use plasma emission, those that use electroluminescence, those that use light emitting diodes, and those that use liquid crystals, but they are not compatible with color image display or larger sizes.

This does not fully satisfy each of the requirements for lowering power consumption.

On the other hand, as a device that satisfies such conditions, JP-A-55
There is a method using candoluminescence disclosed in Japanese Patent No. 3'3734. The principle diagram of this is shown in FIG. 1. A plurality of linear cathodes 10 are used, and the electron beams 16 emitted from each cathode 1o are separated by a certain pitch in the horizontal direction at the electrode 1.1. The light is focused by a vertical focusing/deflection system 12 and a horizontal focusing/deflection system 14 so as to form minute spots on a fluorescent surface 15, respectively. Therefore, a large number of electron beam spots arranged in a row in the horizontal direction are obtained. Furthermore, in order to display images as on a television or the like, each electron beam is modulated by a video signal in a modulation system 13, and at the same time, each electron beam is deflected horizontally and vertically. If the number of canards 10 arranged vertically is m, this deflection area is 1/m in the vertical direction of the entire screen, and if the electron beam is divided into n pieces in the horizontal direction, then the area is the area of the entire screen. 4 in the horizontal direction.

The structure of the fluorescent surface 15 irradiated with the electron beam 16 is as shown in FIG. As shown in the figure, red (R)2o,
Fluorescent bodies emitting light in the primary colors of green (G), +t, and blue (CB) 22 are provided in vertical stripes, and black stripes 23 made of carbon or the like are provided between each phosphor to improve contrast. provided. and one electron beam 16
Looking at this, the area where this electron beam is deflected in the horizontal direction is the S pixel (R, G.

31 sets is one pixel, S is a positive integer), then 5 sets of RG
Electron beam 16 on B phosphor stripe in chronological point order
scans. Here, when the electron beam 16 is horizontally deflected, as the deflection distance becomes larger than the electron beam spot diameter when it is not deflected, the spot diameter becomes larger due to deflection distortion and the like.

Therefore, since each color band light body was arranged randomly (c,
For example, in FIG. 2, the beam diameter when deflecting in a single direction and irradiating the H phosphor 20 is different from the beam diameter when the H phosphor 20 is deflected in one direction.
The beam diameter is different when irradiating the phosphor, and if the beam diameter is slightly larger than the width of the phosphor, even if you try to reproduce the same color.

- Since the saturation of colors reproduced in both directions is different, faithful color reproduction cannot be obtained. Therefore, each color band light body should be provided symmetrically in both the + and - directions, but the pitch of each color band light body must be equal. This is because symmetry is emphasized so much that if the pitches of the color band members are different, vertical color stripes appear in the vertical direction. As described above, it is impossible to provide phosphor stripes so that the pinch of each color band is equal and symmetrical in both the + and - directions.

OBJECTS OF THE INVENTION The present invention provides a color display device that can provide faithful color reproduction regardless of the deflection direction of the electron beam.

Structure of the Invention The present invention focuses on the fact that the eye's color perception characteristics are most sensitive to the hue error and two-color desaturation of red compared to other primary colors. This is a color display device in which the body pitches are arranged in the same way.

Description of examples The present invention will be described in detail below with reference to Examples.

FIG. 3 shows an embodiment of the invention. As shown in Figure 3A and B, the position P of the horizontally undeflected electron beam on the fluorescent surface
is the origin, and the red phosphor positions 20 and 20' in the + and one directions are symmetrical with respect to this, and each of the three primary color emitting phosphors 2
0,21.22. A phosphor array with equal numbers of pixels is shown in Figure 3. A shows a specific example where the horizontal deflection area of one electron beam is an even number of pixels, and B shows a specific example where the horizontal deflection area of one electron beam is an odd number of pixels. 0 In this way, for an undeflected electron beam, a red phosphor stripe 20.20' is placed at a symmetrical position.
When arranged, the red band irradiation beam diameter in each deflection direction becomes equal, and the color saturation for red, to which the eye's color perception characteristics are most sensitive, becomes equal, so color reproducibility is greatly improved.

Effects of the Invention As described above, the present invention provides a color display device having n electron beams in the horizontal direction, each of which has a deflection area of S pixels in the horizontal direction, in which each electron beam is not deflected in the horizontal direction. The red phosphor stripes on both sides are arranged in symmetrical positions with the electron beam position at the time as the origin, and the red, green, and blue primary color emitting phosphor stripes are equally pinched to provide faithful display. Color reproduction characteristics can be obtained.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the basic configuration of a color video display device to which the present invention is applied, FIG. 2 is a perspective view showing a fluorescent surface in a conventional color display device, and FIG. 3A. B is a sectional view showing a fluorescent surface of a color display device according to the present invention. 10... Linear cathode, 11... Electrode, 12... Vertical focusing/deflection system, 13...
Modulation system, 14...Horizontal focusing/deflection system, 15...
...fluorescent surface, 16...electron beam, 20.2
0'... Red band photic body, 21... Front band photic body, 22... Edge band photic body. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure/〆Figure 2 Figure 3

Claims (1)

[Claims] (1) Generate multiple electron beams in the horizontal direction, configure each electron beam to have a deflection area spanning multiple pixels in the horizontal direction, and use the position of the electron beam when it is not deflected in the horizontal direction as the origin, A color display device characterized in that red phosphor stripes on both sides are arranged in symmetrical positions, and the phosphor stripes emitting primary colors of red, green, and blue are arranged at equal pitches.