JPH0864148A - Image display device - Google Patents

Abstract

PURPOSE: To accurately light up a phosphor ink pattern by providing second black stripe patterns on plural black stripe patterns so as to restrict the generation of halation. CONSTITUTION: Black stripe patterns 2 are formed on a glass substrate 1 of the back surface of a cathode-ray tube, and processes of coating, drying, exposing, developing and drying are repeated between the patterns 2 so as to form a phosphor ink pattern 3. Second black patterns 4 are formed on the patterns 2 with the process as same as the patterns 2. When the electron beam 5 abuts on the pattern 3, the secondary electrons 6 are radially discharged, and the secondary electrons 6b, 6c at a remarkably shape angle in relation to the angle of incident of the electron beam 5 to the surface of the pattern 3 abut on the pattern 4. Other phosphor is not struck by the secondary electrons, and the generation of halation is thereby restricted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device provided with a phosphor ink pattern and a black stripe pattern formed on the phosphor screen of a color television picture tube in a color television or the like.

[0002]

2. Description of the Related Art In recent years, in a display device or the like for displaying a color television image using an electron beam, a phosphor ink pattern and a black stripe pattern formed on a phosphor screen are first formed on a glass substrate, for example, a back surface of a cathode ray tube. A surface treatment was performed, a pattern was exposed and developed with a so-called photosensitive solution, a black substance such as graphite was flown, and a stripping treatment was performed to form a black stripe pattern. Then, the phosphor ink pattern was formed between the black stripe patterns, and the steps of applying, drying, exposing, developing and drying were repeated to form the phosphor ink pattern.

An electron beam is applied to illuminate the phosphor, but to illuminate the phosphor brightly,
It is known that secondary electrons are emitted from the phosphor surface when an electron beam having a large energy is applied.

FIG. 6 is a diagram showing the behavior of secondary electrons in a conventional phosphor ink pattern and a black stripe pattern. In FIG. 6, 101 is a glass substrate,
102 is a black stripe pattern, 103 is a phosphor ink pattern, 105 is an electron beam, and 106 is a secondary electron.

It has been known that the secondary electrons 106 are radially emitted from the phosphor ink pattern 103 and hit the phosphor ink pattern 103 again to cause the phosphor to slightly shine.

FIG. 7 shows that when a quadrangle is actually displayed on the screen,
It is a description of how it appears on the screen. The figure shows a light and large square-shaped object appearing around the two squares. This is called halation. In FIG. 7, 107 is a halation. In the halation, when a small character or the like is displayed, a portion that should not originally shine is lit, so that the outline of the character is blurred and the character cannot be clearly displayed. Therefore, in order to suppress the scattering of the generated secondary electrons as much as possible, a carbon sheet is covered over the phosphor to reflect the secondary electrons inside.

FIG. 8 shows a conventional phosphor ink pattern covered with a carbon sheet. In FIG.
108 is a carbon sheet. However, the development of technology to further reduce this halation has been awaited.

Further, as the definition of a displayed image has become higher, a technique for aligning a fluorescent ink pattern or a black stripe pattern having a narrow width with high accuracy has been required.

This is because if the phosphor ink pattern is displaced from the black stripe pattern, a phenomenon called deterioration of color shift or color purity, which impairs the improvement of image quality, occurs. The color shift means that there is a color of the phosphor different from the color of the phosphor that should be originally present, and for example, the green phosphor is located where the red phosphor should be. Further, the color purity means that light is emitted in a state where, for example, phosphors of two colors are mixed. These phenomena will be described in detail with reference to FIGS. 9, 10, 11, and 12.

FIG. 9, FIG. 10, FIG. 11 and FIG. 12 are views for explaining color shift and deterioration of color purity in the conventional image display device. Reference numeral 102 denotes a black stripe pattern, which is mainly composed of graphite or the like and is formed in parallel on the glass substrate 101. Reference numeral 103 denotes a phosphor ink pattern, which emits red, yellow, and green with a phosphor pigment or the like. Then, the respective phosphor ink patterns are formed so that the adjacent colors are different from each other. Reference numeral 109 is an overlapping portion, where the two color phosphor ink patterns 103 are overlapping, 110 is an electron beam, 111
Is the illuminated part of the phosphor.

In FIG. 9, it is assumed that the black stripe patterns 102 having a width of 65 μm are arranged every 135 μm. There is 7 between one black stripe pattern 102 and one black stripe pattern 102.
It is 0 micrometer, and the phosphor ink pattern 103 is formed in the meantime. In the case of a color television, the phosphor ink pattern 103 is formed by arranging 103 colors of red, blue and green in order to form the phosphor ink pattern 103. That is, when a phosphor of one color is formed, the phosphor paint is exchanged, the alignment is redone to form the second type of phosphor next to it, and the third type is formed by the same procedure. The width of the phosphor ink ink pattern 103 that is actually formed is
It is designed for 11 micrometer. This is because displacement of the phosphors and resetting of the phosphors are reset when the phosphor ink pattern 103 is formed, so that a deviation will inevitably occur.

Therefore, as shown in FIG.
Even if the micron meter is generated, the black stripe pattern 102 is designed to have no gap between the black stripe pattern 102 and the phosphor ink pattern 103 because the part of the black stripe pattern 102 which covers the black stripe pattern 102 is 20 micrometer.

However, as shown in FIG. 11, when the width of the black stripe pattern 102 becomes 40 μm and the interval between the black stripe patterns 102 becomes 60 μm as the display image becomes finer. When the deviation is 15 μm in the conventional technique, the phosphor ink pattern 103 is 100 μm in design. For example, if the phosphor of one color is displaced by 15 micrometers to the left, if another phosphor adjacent to the left is formed without displacement, it will be 15 micrometers of 2
The color phosphors can be overlapped.

As shown in FIG. 12, when the electron beam 110 hits the overlapping portion of the phosphors to illuminate the phosphors of two colors, the illuminated portion 111 of the phosphors shown in FIG.
To the portion where the black stripe pattern 102 does not exist, a state in which the phosphors of two colors appear to shine, causing a decrease in color purity.

Therefore, it takes a very long time to align the phosphor ink pattern, or to make the phosphor ink pattern finer than a predetermined width so that the color purity is high, or the phosphor ink pattern. Alternatively, efforts have been made to precisely illuminate the phosphor ink pattern by, for example, finely controlling the formation conditions of the black stripe pattern.

[0016]

However, in the above-mentioned conventional techniques, the halation is not completely suppressed, and as the display image becomes higher in definition, in order to display fine characters clearly, There has been an urgent need to research and develop phosphor ink structures, phosphor ink materials, and electron beam characteristics for suppressing the ratio.

In addition, in the above-mentioned conventional technique, first, a great number of techniques are required for designing a phosphor ink pattern or a black stripe pattern. Next, it takes a very long time to align the phosphor ink pattern with the black stripe pattern, and if the conditions for forming the phosphor ink pattern and the black stripe pattern are not managed very finely, in the case of mass production. In addition, the phosphor ink pattern is displaced from the black stripe pattern. That is,
There has been a problem that the production efficiency becomes extremely poor as the definition of the displayed image becomes higher.

An object of the present invention is to solve the above-mentioned problems, and an image capable of suppressing halation and accurately illuminating even fine characters due to the structure when the phosphor ink pattern and the black stripe pattern are formed. It is intended to provide a display device.

It is another object of the present invention to provide an image display device capable of accurately illuminating a phosphor ink pattern only by conventional alignment of the phosphor ink pattern and the black stripe pattern.

[0020]

In order to achieve this object, an image display device of the present invention comprises a phosphor ink pattern and
It has a phosphor ink pattern structure featuring a black stripe pattern and a second black stripe pattern formed on the black stripe pattern.

Alternatively, the image display device of the present invention comprises a phosphor ink pattern, a black stripe pattern, and a shielding black stripe pattern formed on the black stripe pattern for shielding a part of the phosphor ink pattern. It has a configuration characterized in that.

[0022]

With this structure, when the electron beam hits the phosphor and the secondary electrons are radially emitted, the secondary electron having a very acute angle with respect to the incident angle of the electron beam on the surface of the phosphor is The portion hits the second black stripe pattern, and halation can be suppressed without hitting another phosphor.

Further, with this structure, it is possible to accurately illuminate the phosphor ink pattern without impinging the electron beam on the overlapping portion of the phosphors of the two colors and without degrading the color purity.

[0024]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a phosphor ink pattern and a black stripe pattern of an image display device according to the first embodiment of the present invention. In FIG.
Reference numeral 1 is a glass substrate, for example, a back surface of a cathode ray tube or the like. A black stripe pattern 2 is composed mainly of graphite or the like and is formed in parallel on the glass substrate 1. Reference numeral 3 denotes a phosphor ink pattern, which is a phosphor pigment or the like and emits red, yellow, and green light. Then, the phosphor ink patterns are formed such that the colors of the adjacent phosphor ink patterns are different from each other. Reference numeral 4 denotes a second black stripe pattern, which has exactly the same components as the black stripe pattern 2 and is formed in the same process.

The image display device configured as described above will be described in detail with reference to FIG. First, for example, the black stripe pattern 2 is formed on the glass substrate 1 on the back surface of the cathode ray tube. Next, the phosphor ink pattern 3 is applied between the black stripe patterns 2, and the steps of drying, exposing, developing and drying are repeated to form the phosphor ink pattern 3. Finally, the second black stripe pattern 4 is processed in the same manner as the black stripe pattern 2,
It is formed on the black stripe pattern 2.

By forming the black stripe pattern 2 on the glass substrate 1 and further forming the second black stripe pattern 4 on the black stripe pattern 2, when the electron beam 5 is applied to the phosphor ink pattern 3. The behavior of the emitted secondary electrons 6 will be described with reference to FIGS. 2 and 3.

FIG. 2 is a diagram showing the behavior of the electron beam in the image display device according to the first embodiment of the present invention, and FIG. 3 is a partially enlarged view of FIG. 2 and 3, 5 is an electron beam and 6 is a secondary electron.

When the phosphor ink pattern 3 is hit by the electron beam 5, secondary electrons 6 are radially emitted.
Regarding the secondary electrons 6b and 6c having an extremely acute angle with respect to the incident angle of the electron beam 5 on the surface of the phosphor ink pattern 3,
It is possible to suppress the halation without hitting another phosphor on the second black stripe pattern 4.
However, it is considered that the secondary electrons 6a are attracted to the phosphor ink pattern 3 again without hitting the second black stripe pattern 4 to cause halation. Therefore, although the halation cannot be completely removed, the total height of the black stripe pattern 2 and the second black stripe pattern 4 is 30.
It is possible to remove about 10% of secondary electrons with a micron meter.

The second black stripe pattern 4
The film thickness can be arbitrarily selected from 4 to 5 μm to 10 μm or more depending on the construction method. Moreover, the lateral width of the second black stripe pattern 4 is not always the same as the lateral width of the black stripe pattern 2 depending on the formation conditions. The number of stacking stages is two in this first embodiment, but is not limited to two. Further, it can be used in combination with the carbon sheet shown in the conventional example.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 is a sectional view of a phosphor ink pattern and a black stripe pattern of an image display device according to the second embodiment of the present invention, and FIG. 5 is an enlarged view thereof. In FIGS. 4 and 5, reference numeral 11 denotes a glass substrate, for example, the back surface of a cathode ray tube or the like. Reference numeral 12 denotes a black stripe pattern, which is mainly composed of graphite or the like and is formed in parallel on the glass substrate 11. Thirteen
Is a phosphor ink pattern, such as phosphor pigment, red,
Emit yellow and green. Then, the phosphor ink patterns are formed such that the colors of the adjacent phosphor ink patterns are different from each other. Reference numeral 14 is a black stripe pattern for shielding, which has exactly the same composition as the black stripe pattern 12, and is formed in the same step. Reference numeral 15 is an overlapping portion, where the two color phosphor ink patterns 13 are overlapping, and 16 is an electron beam.

Next, the image display device according to the second embodiment of the present invention will be described in detail. First, for example, the black stripe pattern 12 is formed on the glass substrate 11 on the back surface of the cathode ray tube. Next, the phosphor ink pattern 13 is applied between the black stripe patterns 12, dried, exposed, and
The steps of development and drying are repeated to form the phosphor ink pattern 13. Here, the lateral width of the phosphor ink pattern 13 is designed to be large with respect to the distance between the adjacent black stripe patterns 12 and the gap between the black stripe patterns 12 in consideration of the deviation at the time of formation.
It is formed so as to partially cover the black stripe pattern 12.

However, when the phosphor ink pattern 13 is formed for each color, a deviation occurs, and the adjacent phosphor ink patterns 13 are black stripe pattern 12.
May overlap on top. Such overlapping of the two color phosphors is shown in FIG. Then, in this state, the black stripe pattern 1 already formed is further formed.
In the same alignment as in 2, the shielding black stripe pattern 14 is formed on the overlapping of the phosphors of two colors. As a result, the electron beam that illuminates the phosphor is shielded by the shielding black stripe pattern 14, and the overlapping indivisible portion 15 of the phosphors of two colors is not illuminated.

According to this embodiment, the black stripe pattern 12 is formed on the glass substrate 11, the phosphor ink pattern 13 is formed, and then the shielding black stripe pattern 14 is further formed.
By forming the phosphor ink pattern 13 on the surface 2, the phosphor ink pattern 13 can be accurately formed without degrading the color purity without irradiating the overlapping portion 5 of the phosphors of two colors formed when the phosphor ink pattern 13 is formed with an electron beam. It is possible to achieve good lighting.

The film thickness of the shielding black stripe pattern 14 can be arbitrarily selected from 4 to 5 μm to 10 μm or more depending on the degree of color purity. Further, the horizontal width of the shielding black stripe pattern 14 is not always the same as that of the black stripe pattern 12 depending on the forming conditions. The width can be arbitrarily changed depending on the color purity.

[0037]

As described above, according to the present invention, by forming the second black stripe pattern, it is possible to suppress the halation which has been conventionally generated and to make the phosphor ink pattern shine with high precision, and to obtain a high-definition character. It is possible to provide an image display device capable of displaying an image with a clear contour.

Further, according to the present invention, by forming the black stripe pattern for shielding, it is possible to prevent the deterioration of the color purity due to the overlapping portion of the phosphor ink pattern 3 which has been conventionally generated, and to make the phosphor ink pattern shine accurately. It is possible to provide an image display device capable of

[Brief description of drawings]

FIG. 1 is a sectional view of a phosphor ink pattern and a black stripe pattern according to a first embodiment of the present invention.

FIG. 2 is a diagram showing the behavior of an electron beam in the image display device according to the first embodiment of the present invention.

FIG. 3 is an enlarged view showing the behavior of an electron beam in the image display device according to the first embodiment of the present invention.

FIG. 4 is a sectional view of a phosphor ink pattern and a black stripe pattern in an image display device according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a phosphor ink pattern and a black stripe pattern in an image display device according to a second embodiment of the present invention.

FIG. 6 is a diagram showing the behavior of an electron beam in a conventional image display device.

FIG. 7 is a diagram showing a conventional halation.

FIG. 8 is a sectional view of a conventional phosphor ink pattern and a black stripe pattern.

FIG. 9 is a sectional view of a phosphor ink pattern and a black stripe pattern in a conventional image display device.

FIG. 10 is an enlarged cross-sectional view of a phosphor ink pattern and a black stripe pattern in a conventional image display device.

FIG. 11 is a cross-sectional view of a phosphor ink pattern and a black stripe pattern in a conventional image display device.

FIG. 12 is a sectional view of a phosphor ink pattern and a black stripe pattern in a conventional image display device.

[Explanation of symbols]

 1,11 Glass substrate 2,12 Black stripe pattern 3,13 Phosphor ink pattern 4 Second black stripe pattern 5,15 Electron beam 6,16 Secondary electron 14 Black stripe pattern for shielding

Claims (2)

[Claims] 1. A plurality of phosphor ink patterns formed on a glass substrate, a plurality of black stripe patterns formed between the plurality of phosphor ink patterns, and a plurality of black stripe patterns formed on the plurality of black stripe patterns. An image display device comprising a second black stripe pattern. 2. A plurality of phosphor ink patterns formed on a glass substrate, a plurality of black stripe patterns formed between the plurality of phosphor ink patterns, and a plurality of black stripe patterns formed on the plurality of black stripe patterns, An image display device comprising a shielding black stripe pattern for shielding a part of the phosphor ink pattern.