KR100872360B1 - A Flat Color CRT - Google Patents

Abstract

  The present invention relates to a planar color cathode ray tube comprising a panel having a substantially flat outer surface and having a predetermined curvature on an inner surface thereof, and a funnel mounted to a rear surface of the panel; The outer surface of the panel includes a conductor coating film, an anti-reflection film, and a diffuse reflection film, wherein the conductor coating film is characterized in that the particle size of the conductor in the center is different from the conductor particle size in the periphery.

Therefore, the present invention aims to improve the brightness uniformity characteristics and contrast on the screen of the cathode ray tube by adjusting the center and peripheral transmittance of the screen to the particle size of the conductor.

Description

Flat color cathode ray tube {A Flat Color CRT}

1 is a schematic view of a typical flat color cathode ray tube.

Figure 2 is a view showing a circular plate method for applying a coating liquid to the panel of the color cathode ray tube according to the prior art.

3 is a view showing a process of applying a conductor coating film, an anti-reflection film and a diffuse reflection film applied to the outer surface of the panel according to the present invention.

4 is a cross-sectional view of the panel glass according to the present invention.

Figure 5 is a graph showing the transmittance of the coating film when there is no temperature difference in the center and periphery of the panel glass.

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

1: Panel 3: shadow mask

1a: Conductor coating film 1b: Antireflection film

1c: diffuse reflection 51: spray 1

52: Spray 2 61: Center Particle Particles

62: conductor particles at the periphery

The present invention relates to a color cathode ray tube, and more particularly, a cathode coating is formed by spraying a conductor coating film on a surface of a panel using a sprayer to a conductor having a different particle size from the center and the periphery of the outer surface of the panel. It relates to a cathode ray tube panel that compensates for the difference in brightness of the tube.

As shown in FIG. 1, a typical flat CRT is coated with fluorescent surfaces 4 of R, G, and B on the inner side, and a panel 1 on which the explosion-proof means is fixed on the front side, and fused to the rear end of the panel. A funnel (2), an electron gun (11) inserted into the neck portion of the funnel to emit an electron beam (6), a deflection yoke (5) for deflecting the electron beam (6), and a constant distance inside the panel A shadow mask (3) having a plurality of holes formed therethrough so as to pass through the electron beam (6), a frame (7) fixedly supporting the shadow mask so as to maintain a constant distance from the inner surface of the panel, and the frame and A spring 8 for connecting and supporting the panel, an inner shield 9 for shielding the cathode ray tube from being affected by the external geomagnetism, and a reinforcing band installed around the side surface of the panel to prevent external impact.

In addition, there is a magnet 12 that corrects the trajectory of the electron beam 6 so as to strike the predetermined phosphor accurately, thereby preventing poor color purity. In addition, the outer surface of the panel 1 is coated with a conductor coating film 1c formed of a material having good conductivity and an antireflection film 1b for preventing reflection formed of a material having a different refractive index on the conductor coating film in order to improve explosion-proof characteristics. do.

Looking at the operation of the cathode ray tube having the configuration as described above, when a voltage is first supplied to the stem pin, heat is applied to the cathode, electrons are emitted from the cathode to which the heat is applied. The emitted electrons are focused or accelerated by the sixth electrode at the first electrode.

The electron beam 6 formed by the focused or accelerated emitted electrons is deflected by the deflection yoke 5 and evenly scanned throughout the entire panel 1, and the electron beam 6 is provided with a shadow mask provided in front of the panel 1. It passes through 3) and collides with the phosphor 4 coated on the panel 1 to emit light.

The outer panel glass 1 of the cathode ray tube has a smooth surface, so that external light is specularly reflected, which not only makes the viewer's eyes tired, but also makes viewing of the screen itself difficult. In addition, due to the difference in thickness between the center and the periphery of the panel glass 1, the light emitted from the panel glass 1 may appear to be relatively dark compared to the center part. Thus, in the conventional method, the color coating thickness of the central part is relatively thicker than the peripheral part by applying a temperature difference to the center and the periphery of the panel glass 1 using the spin method in the colored coating. The brightness uniformity characteristic is improved by the difference in the brightness | luminance which generate | occur | produces in the fluorescent substance of the center and periphery of ().

There is also a method in which the lowest layer is adjusted only by the coloring function by a spray method, but at least one or more layers are also required for electromagnetic shielding and antistatic.                         

And, Figure 2 is a schematic diagram for explaining a coating liquid coating method according to the prior art, an example of a circular plate method. First, the spin coat 28 is provided with a rotating part including a chamber 15 which is fixed and a circular plate 25 positioned in the center of the chamber 15 and rotated by a motor 20. The coating liquid supply device 30 is provided on the upper portion of the 25, and includes a connecting pipe 36 and a nozzle 38 having the coating liquid tank 32 and the regulator 34.

Here, the disc plate 25 is formed with a groove in the shape of a panel glass 1, the panel glass 1 is mounted on the upper portion thereof, and the rotation speed is controlled by a rotation speed (RPM) controller connected to the motor 20. do. It is a typical way of simply coating the coating liquid in the center.

On the other hand, the shape of the general panel glass is designed to have a constant curvature on both the inner surface and the outer surface, and because of the curvature of the outer surface, the image is distorted at the surface of the image. Resulted.

In order to improve this, conventionally, a structure of a panel glass having an outer surface is used, which is a structure that eliminates distortion of the screen at an appropriate viewing distance in consideration of the image floating effect of the user and realizes a flat image that can reduce eye fatigue. Although widely used, it could not completely compensate for the distortion of the screen.

In the conventional spin method, the conductor having a coloring function varies the temperature of the center and the peripheral portion, thereby adjusting the thickness of the film to adjust the transmittance. As a result, if the temperature difference between the center and the periphery does not occur, the transmittance cannot be easily adjusted, which may result in not being able to satisfy the brightness uniformity characteristics. do.

Therefore, the object of the present invention has been devised to solve the above problems.

The present invention relates to a surface treatment method of a panel portion of a cathode ray tube used in a TV or a monitor, and is a method for improving brightness uniformity characteristics and contrast, and having a central and peripheral transmittance. Is to adjust the particle size of the conductor.

Technical means of the present invention for achieving the above object is a planar color cathode ray tube comprising a panel having an outer surface substantially flat and having a constant curvature on the inner surface, and a funnel mounted on the rear surface of the panel; The outer surface of the panel includes a conductor coating film, an anti-reflection film, and a diffuse reflection film, wherein the conductor coating film is characterized in that the particle size of the conductor in the center is different from the conductor particle size in the periphery.

And the second technical means of the present invention for achieving the above object is characterized in that the thickness of the conductor coating film is thicker than the center portion peripheral.                     

In addition, the conductor of the conductor coating film is characterized in that the average particle diameter in the center portion 150% to 300% compared to the peripheral portion.

More preferably, the conductor coating layer is characterized in that the panel glass is rotated about the center portion and at the same time the conductor is applied by spraying using a sprayer.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 3 illustrates a process of applying a conductive coating film and an anti-reflection film for preventing an electric charge and an antireflection, and a diffuse reflection film to prevent diffuse reflection on the outer surface of the panel glass 1 according to the present invention. First, the conductor coating film 1c is applied by spraying a conductive coating liquid having a coloring function by spraying while rotating the cathode ray tube at a constant rotational speed (RPM).

That is, the conductive coating film 1c is sprayed with a relatively small particle size 62 by sprayer 2 52 while the panel glass 1 is rotated at a constant rotational speed (RPM). A film of transmittance is formed. At the same time, the sprayer 1 51 sprays and applies the conductor 62 having a larger particle size than the sprayer 2 52 to the center portion to form a film having a lower transmittance than the peripheral portion in the center portion, thereby providing uniformity in brightness. ) Properties and contrast can be improved.

In addition, the particle size of the conductor sprayed from the sprayer 1 51 uses a conductor 150% to 300% larger than the particle size of the conductor sprayed from the sprayer 2 52.

Table 1 shows the transmittance and coating (stain) state according to the particle size.

Particle size (relative to surrounding area) Transmittance Coating condition (stain) Center Peripheral Center Peripheral 100% 71 73 good good 120% 70 73 good good 130% 70 73 good good 150% 65 73 good good 170% 65 73 good good 200% 65 73 good good 230% 65 73 good good 250% 65 73 good good 280% 65 73 good good 300% 65 73 good good 310% 64 73 bad good 330% 61 73 bad good 350% 60 73 bad good

If the particle size of the conductor is less than 150%, as shown in Table 1, the difference in coating transmittance of the central part and the peripheral part does not differ so much that it does not satisfy the Brightness Uniformity property. In this case, the size of the conductor particles is important because defects such as stains occur.

After applying the conductor coating film 1c, the antireflection film 1b is applied by a spin method, which is a conventional method, and the antireflection film 1a is applied to the outer surface of the antireflection film 1b by a spray method.

In more detail, in the conventional spin method, the thickness of the panel glass 1 is adjusted by applying a temperature variation in the center and the periphery of the panel glass 1 to apply the coating liquid of the conductive material having a coloring function to adjust the variation in the transmittance of the center and the periphery. Although the brightness characteristics have been improved, the present invention can be made constant without adjustment of variables such as temperature, that is, without temperature difference between the central part and the peripheral part. Here, the central portion refers to the point where the radius of the panel glass 1 is 30 mm and the peripheral portion refers to the point 40 mm from the end of the panel glass 1.

The cathode ray tube emits light from the panel glass 1 by receiving energy from the phosphor 12 by electrons emitted from the cathode of the electron gun 11. If the panel glass 1 has curvature, there is a problem of brightness and contrast because there is a difference in thickness between the center part and the peripheral part. To compensate for this, a colored panel glass according to transmittance or colored coloring is used. It is common to apply a coating.

However, the present invention, as shown in Figure 4, the coating for the electromagnetic shielding and anti-static generated in the above-described panel glass (1), in the coating of the lowermost layer to adjust the thickness of the coating film in the center and periphery to the particle size of the conductor In addition to the function of electromagnetic shielding and antistatic, the inner surface is curvature and the flat surface is applied to the planar cathode ray tube with the coating technology to easily adjust the brightness uniformity characteristics and improve the contrast by adjusting the transmittance. will be.

In addition, when the coating method using a spin method by placing the temperature deviation of the existing center and the peripheral portion can solve the problem that the poorness of the uniformity (brightness uniformity) characteristics and the poor coating properties due to the poor temperature can occur.

FIG. 5 shows experimentally the transmittance of a desired coating film when there is no temperature difference in the center and periphery of the panel glass 1, and in the present invention, it is possible to adjust and design a desired transmittance for a certain spray condition.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical concept or essential characteristics. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the foregoing description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.

As described above, in the present invention, when the panel glass has a flat outer surface and the inner surface has a constant curvature, a spray method of spraying a conductor having a different particle size on the outer surface of the panel glass to compensate for the difference in thickness between the central portion and the peripheral portion is performed. By coating with, there is an effect of improving the brightness uniformity (property uniformity) characteristics and the problem that the poor coating properties due to the poor temperature may occur.

Claims (4)

What is claimed is: 1. A flat color cathode ray tube comprising a panel having an outer surface substantially flat and having a constant curvature on an inner surface thereof, and a funnel mounted to a rear surface of the panel; The outer surface of the panel includes a conductor coating film, an antireflection film, and a diffuse reflection film, The conductive coating film is a flat color cathode ray tube, characterized in that the particle size of the conductor of the center portion is different from the conductor particle size of the peripheral portion. The method of claim 1, The thickness of the conductor coating film is a flat color cathode ray tube, characterized in that the central portion is thicker than the peripheral portion. The method of claim 1, The conductor of the conductor coating film is a flat color cathode ray tube, characterized in that the average particle diameter in the center portion 150% to 300%. The method of claim 1, The conductive coating film is a flat color cathode ray tube, characterized in that the panel glass is rotated about the center portion and at the same time the conductor is sprayed using a spray (Sprayer).

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