KR100594648B1 - Selective display device of color cathode ray tube - Google Patents

Abstract

Disclosed is a selective display device of a color cathode ray tube for selectively displaying a color image.

The present invention is configured such that the phosphor area at the outermost side of the effective surface of the fluorescent film is smaller than that of other adjacent phosphors, and the offset amount corresponding to the three-color phosphor at the outermost side of the effective surface of the shadow mask is smaller than the deflection angle of the electron beam. Characterized in a small direction,

Accordingly, since the incomplete color is not displayed on the outermost side of the screen, there is an advantage that the quality of the screen can be improved.

Phosphor, Shadow Mask, Offset, Stripe

Description

[Selection display apparatus in color CRT}             

1 is a block diagram of a general planar cathode ray tube,

2 is a configuration diagram of a conventional fluorescent film,

2a is a plan view,

2b is a sectional view,

3 is a configuration of a conventional shadow mask,

4 is a configuration diagram of a fluorescent film according to the present invention,

4A is a plan view,

4B is a sectional view,

5 is a configuration diagram of a shadow mask according to the present invention.

*** Explanation of symbols for main parts of drawing ***

1: fluorescent film 1R ': red phosphor

1G ': green phosphor 1B': blue phosphor

2: panel 5: electron beam

7: shadow mask 7a ': outermost aperture

10: black matrix

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly, to a selective display device that does not visually sense light emission of the outermost phosphor.

In general, color cathode ray tubes are red, green, and blue phosphor pixels having three primary color emission spectra of light, which is an all-optical device that converts image information received as an electrical signal into visual information, and graphite, a light absorbing material. And it is a device that plays the role of delivering to the human vision by reproducing a color image through a fluorescent film made of aluminum film for brightness enhancement.

Such a color cathode ray tube includes an apparatus as shown in FIG. 1.

The flat cathode ray tube shown in FIG. 1 will be described as an example of the color cathode ray tube according to the prior art.

As shown in FIG. 1, the planar cathode ray tube is fused with a flat panel 2 coated with a red, green, and blue fluorescent film 1 on the inner side thereof, and a frit glass at the rear end of the panel 2, thereby forming an inside of the cathode ray tube. A funnel 3 of a bulb form to be kept in a vacuum state, an electron gun 6 enclosed in a neck 4 of the funnel 3 to emit an electron beam 5, and an electron beam 5 to pass therethrough. A shadow mask 7 having a myriad of apertures 7a, a rail 8 supporting the shadow mask 7 at a predetermined distance from the inner surface of the panel 2, and the electron beam 5 horizontally and vertically And a deflection yoke 9 provided on the outer circumferential surface of the neck 4 of the funnel 3 so as to deflect in the direction.

In this state, when power is applied, the electron beam 5 is emitted from the electron gun 6, and the electron beam 5 is deflected in the horizontal and vertical directions by the deflection yoke 9, and the shadow mask 7, which is a color-selective electrode, is used. The image is displayed while striking the fluorescent film 1 in the state where color screening is performed while passing through?).

The display of the color image is caused by red, green, and blue phosphors 1R (1G) and 1B constituting the fluorescent film 1, and is shown between the black matrix 10 for absorbing external light as shown in FIG. It can be seen that the stripe or dot-shaped phosphors 1R (1G) 1B that emit light of green and blue are regularly arranged.

In this state, the three electron beams 5 emitted from the electron gun 6 cross each other as they pass through the shadow mask 7, and the crossed electron beams 5 reach the entire fluorescent film 1 when they reach the fluorescent film 1. Each of the corresponding red, green, and blue phosphors 1R, 1G, and 1B strikes each other so that three colors are emitted to display a color image.

That is, the three primary colors of light, red, green, and blue three-color phosphors (1R) (1G) (1B) can express various colors by the sum of colors caused by the strike of the electron beam 5.

3 illustrates a shadow mask having a conventional structure. The shadow mask 7 requires a certain thickness to prevent deformation, and the direction of the fluorescent film 1 and the electron gun (to improve the transmission efficiency of the electron beam 5). The aperture 7a is formed by etching in both directions of the 6) direction.

At this time, the aperture 7a of the shadow mask 7 is substantially offset to the deflection angle θ of the electron beam 5 so as not to interfere with the incident angle of the electron beam 5 passing through the shadow mask 7. It is configured to have a quantity.

In this case, since the offset amount of the shadow mask 7 is configured to continuously change similar to the deflection angle θ of the electron beam 5, exposure is performed using the shadow mask 7 as a subject when forming the fluorescent film 1. In this case, a phosphor stripe width substantially equal to that of the aperture 7a of the shadow mask 7 can be realized.

However, the fluorescent film of the conventional structure has almost the same stripe width and black matrix width in the entire effective surface area of the screen. The outermost phosphor of the effective surface has only adjacent colors on one side, and thus a perfect combination of colors is impossible. Incomplete color is displayed as an image, which causes a problem of degrading a screen.

Accordingly, the present invention has been proposed in view of this point, and an object thereof is to provide a display device for selecting a color cathode ray tube in which an incomplete color on the outermost side of the effective surface of the screen is not displayed as an image.

According to an aspect of the present invention, a display device for selecting a color cathode ray tube includes: a phosphor film having red, green, and blue phosphors for color image display, and a black matrix for absorbing external light; In the color cathode ray tube including a shadow mask spaced apart from the fluorescent film by a predetermined distance, the color mask:

The fluorescent film is characterized in that the area of the phosphor on the outermost side of the effective surface is smaller than that of other adjacent phosphors.

Preferably, when the width of the first phosphor is W1, the width of the second phosphor is W2, and the width of the third phosphor is W3 from the outermost side of the effective surface of the fluorescent film, the inequality W1 < W2 < W3 is satisfied. .

를 만족하는 것을 특징으로 한다.Optionally, the width of the first phosphor is W1, the width of the second phosphor is W2, and the width of the third phosphor is W3 from the outermost side of the effective surface of the fluorescent film.

Characterized by satisfying.

Preferably, if the distance from the first phosphor to the second phosphor on the outermost side of the phosphor film effective surface is L1 and the distance from the second phosphor to the third phosphor is L2, the inequality L1 <L2 is satisfied.

On a color cathode ray tube including a fluorescent film having red, green, and blue phosphors for displaying color images on the inner surface of the panel, and a black matrix for absorbing external light, and a shadow mask that is spaced apart from the fluorescent film by a predetermined distance. In:

According to another aspect of the present invention, there is provided a color cathode ray tube selection display device comprising: a phosphor film having red, green, and blue phosphors for color image display and a black matrix for absorbing external light on an inner surface of the panel; In a color cathode ray tube containing a shadow mask spaced apart from the fluorescent film by a predetermined distance:

The shadow mask is characterized in that the offset amount of the aperture corresponding to the three-color phosphor on the outermost side of the effective surface is smaller than the deflection angle of the electron beam.

In this way, even if the phosphor on the outermost side of the effective surface of the fluorescent film emits light, its area is small, so that the light emission intensity is weak and is not displayed to the outside.

As a result, an incomplete color is not displayed at the edge of the screen, thereby providing a high quality screen.

And, there may be a plurality of embodiments of the present invention, hereinafter will be described in detail with respect to the most preferred embodiment.

This preferred embodiment allows for a better understanding of the objects, features and advantages of the present invention.

Hereinafter, exemplary embodiments of the display device for selecting a color cathode ray tube according to the present invention will be described in detail with reference to the accompanying drawings.

In addition, in drawing used for description, about the component same as FIG. 1 thru | or FIG. 3, the same code | symbol may be attached | subjected, and the overlapping description may be abbreviate | omitted.

4 is a schematic view of a fluorescent film according to the present invention, FIG. 4A is a plan view, FIG. 4B is a short shave, and FIG. 5 is a schematic view of a shadow mask according to the present invention.

The color cathode ray tube according to the present embodiment prevents the incomplete color of the outermost phosphor of the effective surface of the fluorescent film 1 from being displayed as an image. The color cathode tube is largely structurally modified from the fluorescent film 1 and the shadow mask 7. will be.

First, as shown in FIG. 4, the fluorescent film 1 is configured such that the area of the phosphor 1R 'on the outermost side of the effective surface is smaller than that of other adjacent phosphors 1G' and 1B '.

This is because the light emission of the phosphor is proportional to the area thereof. Therefore, when the area of the phosphor is reduced, the light emitting area becomes smaller, and thus the light emission degree is weakened.

In the drawing, the case where the red phosphor 1R 'is positioned on the outermost side of the effective surface of the fluorescent film 1 is shown as an example.

At this time, to reduce the area of the phosphor, the width is reduced under the same conditions. Therefore, the width of the first phosphor 1R 'is W1 from the outermost side of the effective surface of the phosphor film 1, and the width of the second phosphor 1G' is W2, If the width of the third phosphor 1B 'is W3, a relationship such as W1 &lt; W2 &lt; W3 can be established.

Here, when the width of the outermost phosphor 1R 'of the effective surface of the fluorescent film 1 is configured to be 0.25 to 0.85 times the width of the second phosphor 1G' or the width of the third phosphor 1B '. The effect appears best, and if it is 0.25 times or less, there is a problem in color combination with adjacent phosphors, and if it is 0.85 or more, an incomplete color is displayed on the screen.

In addition, since color implementation in the color cathode ray tube is possible by combining with adjacent colors, the closer the distance to the adjacent colors is, the more advantageous it is.

Accordingly, the outermost phosphor 1R 'is configured to be close to the center of the screen, for example, from the first phosphor 1R' to the second phosphor 1G 'on the outermost side of the effective surface of the phosphor film 1. If L is the distance from the second phosphor 1G 'to the third phosphor 1B', then L2 satisfies the relationship L1 <L2.

5 shows the shape of the shadow mask 7 according to the present invention. The aperture 7a except for the aperture 7a 'positioned at the outermost side is configured to increase in correspondence with the deflection angle θ. The apertures 7a 'corresponding to the red, green, and blue phosphors 1R', 1G ', 1B' located on the outermost side of the effective surface of the fluorescent film 1 have a deflection angle, that is, an electron beam 5 The intensities of the three-color electron beams 5 were changed to be smaller than the incident angle θ of.

This is because the intensity of the electron beam 5 striking the outermost phosphor 1R 'is weaker than that of the electron beam 5 striking the other phosphors 1G' and 1B ', resulting in incomplete color at the outermost portion of the screen. This is to prevent the image from being displayed.

In addition, when the shadow mask 7 having the above-described shape is applied to the subject during the exposure process during the phosphor film forming process, the width of the outermost phosphor 1R 'is larger than the width of the adjacent other phosphors 1G' and 1B '. It is obvious that it can be implemented small.

In the above, the structure of the shadow mask 7 and the fluorescent film 1 is changed so that an incomplete color is not displayed at the outermost side of the screen, but the phosphor located at the outermost side irrespective of the arrangement of the three colors of electron guns and the striking of the phosphors The positions of the electron beams are shifted from each other to generate a difference in luminance, thereby achieving the same effect as the present invention.

On the other hand, in contrast to the conventional technique, that is, the red, green, and blue phosphors are composed of the same width so that an incomplete color is displayed on the outermost side of the effective surface of the screen, the present invention provides the It can be seen that the area is made smaller than the area of the other phosphor and the outermost aperture of the shadow mask is smaller than the incident angle of the electron beam so that incomplete colors are not displayed on the outermost side of the effective surface of the screen.

As a result, according to the present invention, since the entire color can be realized in the entire screen, there is an advantage of improving the quality of the screen.

In addition, although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art.

Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the appended claims of the present invention.

It is clear from the above description that the present invention does not display an incomplete color on the outermost side of the screen, so that the quality of the screen can be improved.

Claims (5)

On a color cathode ray tube including a fluorescent film having red, green, and blue phosphors for displaying color images on the inner surface of the panel, and a black matrix for absorbing external light, and a shadow mask that is spaced apart from the fluorescent film by a predetermined distance. In: The fluorescent film, A color cathode ray tube selection display device, characterized in that the area of the phosphor on the outermost side of the effective surface is smaller than that of other adjacent phosphors. The method of claim 1, If the width of the first phosphor is W1, the width of the second phosphor is W2, and the width of the third phosphor is W3 from the outermost side of the phosphor film effective surface, A selective display device for a color cathode ray tube, characterized by satisfying the inequality W1 &lt; W2 &lt; The method of claim 2, If the width of the first phosphor is W1, the width of the second phosphor is W2, and the width of the third phosphor is W3 from the outermost side of the phosphor film effective surface, Inequality

The display device of the color cathode ray tube, characterized in that satisfying the. The method of claim 1, If the distance from the first phosphor to the second phosphor on the outermost side of the phosphor film effective surface is L1, and the distance from the second phosphor to the third phosphor is L2, A selection display device for a color cathode ray tube, characterized by satisfying an inequality L1 &lt; L2. The method of claim 1, The shadow mask is, And the offset amount of the aperture corresponding to the three-color phosphor on the outermost side of the effective surface is smaller than the deflection angle of the electron beam.

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