KR20050092192A - Cathode ray tube - Google Patents

Abstract

The present invention relates to a color cathode ray tube comprising a panel coating film containing silicon carbide particles so as to efficiently adjust the transmittance of the surface of the cathode ray tube panel and improve the film strength, wherein the outer surface is flat and the inner surface is constant. A panel having a curvature panel, a funnel mounted to the rear of the panel, a shadow having an electron gun inserted into the neck portion of the funnel to emit an electron beam toward the screen, and a plurality of electron beam passing holes arranged at regular intervals on the inner surface of the panel; In the color cathode ray tube comprising a mask, the coating film of the panel is composed of metal fine particles, pigments, conductors, and silicon carbide (SiC) to improve the film strength and enable efficient transmittance adjustment, It is possible to improve luminance uniformity characteristics and contrast characteristics of the central and peripheral portions of the panel, resulting in It has the effect of improving the reliability of the product.

Description

 Color Cathode Ray Tube {Cathode Ray Tube}

The present invention relates to a color cathode ray tube, and in particular, the lowermost layer of the panel coating layer contains fine particles of silicon carbide so as to efficiently adjust the transmittance of the surface of the cathode ray tube panel and improve the film strength, thereby providing uniformity in luminance and contrast characteristics. It relates to a color cathode ray tube that can improve the.

Referring to Figures 1 to 3 to look at the coating film of the cathode ray tube according to the prior art as follows.

The color cathode ray tube is used in all display devices that convert and display an electric signal containing image information into an image by the action of an electron beam, and includes images of the front and left and right sides, including distortion of the image, which is a disadvantage of the conventional convex CRT. In order to make up for the difference, a flat surface type or flat panel type cathode ray tube with flatness of the panel appearance is being replaced.

First, the structure and operation of a general color cathode ray tube will be described with reference to FIG. 1.

 The cathode ray tube basically includes a panel (1), a funnel (2), a shadow mask (3), a deflection yoke (4), an electron gun (5), and the panel (1) corresponds to the screen of the CRT. As a part, it forms a part of a vacuum container and the part which image information is converted into final visual information at the same time.

The panel 1 is composed of a face portion 1a and a side wall portion 1b made perpendicular to the face portion 1a. Inside the face portion 1a surrounded by the side wall portion 1b, a phosphor layer 8 in which a phosphor composed of color components of red (R), green (G), and blue (B) is deposited in a dot or stripe shape is formed. Include.

In addition, a shadow mask 3 is disposed close to the phosphor 8 and serves as a color selection electrode, and an antireflection and electromagnetic wave shielding film 1c is applied to the surface of the panel 1.

The shadow mask 3 allows the three-color electron beam emitted from the electron gun to reach the fluorescent surface formed inside the panel 1 accurately, and a plurality of passage holes through which the electron beam can pass are formed in the metal plate. A stud pin 9 welded to (7) and inserted into the panel side wall portion 1b is mounted in the panel 1 using a suspension spring (not shown).

The funnel 2 constitutes a part of the vacuum container together with the panel 1, and the shadow mask 3 and the electron gun 5 are inserted as the anode voltage supply terminal is attached and the inner conductive film is applied therein. Supply the anode voltage to the final electrode of.

The electron gun 5 is a device for emitting an electron beam 6 in accordance with an electric signal for displaying image information. The electron gun 5 is inserted and mounted in the funnel 2, and needs to independently stimulate three primary color phosphor pixels. It consists of an element.

The deflection yoke 4 scans an electron beam emitted from the electron gun up, down, left, and right so that an electric signal transmitted in time series is reproduced as a two-dimensional image in a CRT, whereby the electron beam passes through the shadow mask 3. Then, the phosphor film 8 is reached, and the phosphor film 8 emits light by the energy of the electron beam to reproduce an image.

The color cathode ray tube having such a structure has a large radius of curvature (high flatness) such that the outer surface of the face portion 1a of the panel 1 is close to the plane for the planarization of the panel 1, and the phosphor layer 8 The inner surface formed with a radius of curvature has a degree of curvature so that the feeling of the plane is not damaged when the screen is viewed from the outer surface.

At this time, the outer surface of the panel of the cathode ray tube is formed with a smooth surface, so that the external light is specularly reflected, not only makes the eyes of the viewer watching from the front, but also difficult to see the screen itself.

In addition, as the cathode ray tube is flattened, the thickness of the corner side becomes thicker than the thickness of the center side, and accordingly, the difference in brightness between the center side and the corner side is increased, so that the displayed image is darker than the center image. The problem is losing.

Therefore, the color cathode ray tube according to the prior art to solve this drawback to reduce the reflected light by the diffuse reflection of the external light, in order to remove the electrostatic charge generated by applying a conductive film having a surface resistance on the outer surface of the panel, a conductive metal An oxide-containing silica base solution and a low reflection silica base solution (SiO 2) are coated on the outer surface of the panel.

In addition, by providing a temperature difference in the center and the periphery of the panel 1, the coating thickness of the colored film in the central part is applied relatively thickly compared to the periphery, whereby the difference in the luminance generated in the phosphors in the center and the periphery of the panel 1 is different. By remaining, the luminance uniformity (B / U) characteristics are improved.

However, in the coating film according to the prior art, the transmittance is adjusted by adjusting the thickness of the film by varying the thickness of the conductor having a coloring function by the temperature of the center and the periphery. Therefore, when the temperature difference between the center and the periphery of the panel does not occur, the transmittance is It may not be easy to adjust the luminance uniformity (B / U) characteristics may not be satisfied, as well as a problem that may occur when applying a color film to the panel stains to reduce the aesthetics of the product. have.

The present invention has been made to solve the above problems of the prior art, the panel coating film is composed of silicon carbide particles so as to efficiently adjust the transmittance of the surface of the cathode ray tube panel and improve the film strength, An object of the present invention is to provide a color cathode ray tube capable of improving uniformity and contrast characteristics.

Color cathode ray tube according to the present invention for solving the above problems is the outer surface is flat and the inner surface has a constant curvature, a funnel mounted on the rear of the panel, and inserted into the neck portion of the funnel electron beam toward the screen A color cathode ray tube comprising an electron gun that emits light and a shadow mask having a plurality of electron beam passing holes arranged at regular intervals on an inner surface of the panel, wherein the coating film of the panel includes metal fine particles, pigments, and conductors. It is characterized in that it comprises a silicon carbide (SiC) to improve the film strength and enable transmittance adjustment.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

2 is a view showing the configuration of a panel coating film of a cathode ray tube according to the present invention, Figure 3 is a view showing a panel coating coating apparatus of a cathode ray tube according to the present invention.

As shown in FIG. 2, the panel coating film of the cathode ray tube according to the present invention has a first layer 50 in contact with the panel 1 so that the coating film is adhered to, and external light diffusely reflecting external light by having a low refractive index. And a second layer 55 to which an anti-reflection film is applied, and a third layer 60 in contact with the atmosphere to prevent diffuse reflection and composed of a silica thin film.

In addition, the first layer 50 contains a colorant (not shown) for coloring the panel of the color cathode ray tube, and metal fine particles 52, the colorant in the state in consideration of the content and concentration of the metal fine particles It comprises a pigment 51 and silicon carbide 53 (SiC).

The pigment 51 may be selected from various types in consideration of the transmission color, and representative examples thereof are carbon black or titanium black, and one or more of them may be mixed.

At this time, the coating film is adjusted to transmittance by applying a mixture of the light-absorbing metal fine particles 52 and the general pigment 51, such as Pd (palladium), Ru (ruthenium), Ag (silver) and Au (gold). In addition, a general pigment 51 may be added to a transparent conductor such as indium tin oxide (ITO) and antimony tin oxide (ATO) to adjust the transmittance as a function of coloring only.

In addition, in order to satisfy the stability of the solution according to the dispersibility of the coating solution itself, coating coating properties and coating properties, the mixing ratio and the manufacturing method according to this is important. Can be adjusted.

Therefore, the cathode ray tube according to the present invention, in the coloring coating of the panel, containing a transparent conductor as well as metal fine particles, including a conventional pigment to facilitate the transmittance adjustment, but not only the coloring function but also silicon carbide (which can improve the film strength) 53, SiC), and by using silicon carbide 53 (SiC), the adhesion between the lowermost layer and the panel 1 can be further strengthened, thereby improving the strength of the coating film and more efficiently adjusting the transmittance.

The coating film properties of the cathode ray tube according to the present invention will be described in detail with reference to Table 1 showing coating film properties and applicability according to the pigment and silicon carbide (SiC) ratio.

Condition Ratio Strength Haze Applicability Pigment SiC Test # 1 One 9 9H 20.0 Bad Test # 2 2 8 9H 15.0 Bad Test # 3 3 7 9H 8.0 Bad Test # 4 4 6 9H 3.0 Bad Test # 5 5 5 9H 1.5 Bad Test # 6 6 4 9H 0.5 good Test # 7 7 3 8H 0.3 good Test # 8 8 2 7H 0.2 good Test # 9 9 One 7H 0.1 good

As shown in Table 1, the ratio of the pigment 51 and the silicon carbide 53 (SiC) corresponding to the transmittance adjustment except for the conductor is most suitably set to 6: 4 to 7: 3.

If the ratio of the pigment 51 and the silicon carbide (53, SiC) is 5: 5 or more, the transmittance is adjusted, and the film strength is also improved, but haze due to silicon carbide (SiC) increases, resulting in poor applicability and There is a disadvantage of increasing eye fatigue, and when the ratio is less than 8: 2, the transmittance is adjusted, but the effect of the film strength is not obtained.

On the other hand, the silicon carbide (SiC) production used in the present invention is a pure oxide by heating and evaporating the remaining organic molecules after spinning the metal and water to form a gel and spinning it when the viscosity reaches a certain degree to extract the fibers, etc. The sol-gel technique is used to mix alcohols such as ethanol and water, and an appropriate amount of acid catalyst is added to silicates such as TMOS and TEOS, followed by heating at 60 ° C. for about 30 minutes. In one state, hydrolysis and condensation reactions are carried out.

In this case, various kinds of additives are added to improve solution stability and thin film characteristics. Specifically, poly silane (Poly Silane) for viscosity stability is used. In addition, surfactants composed of anions and cations are added for surface tension and dispersion stability.

The silicon carbide (SiC) powder size of 70 to 150nm is used, which is 69 or less size is good film formation, but difficult to manufacture, in the case of 151 nm or more, even if the ratio of pigment and silicon carbide (SiC) is similar to film formation This is because the increase in haze causes the disadvantage of increasing eye fatigue.

In addition, in applying the coating liquid of a conductor having a coloring function, the thickness of the coating film is adjusted by giving a temperature deviation between the center and the periphery of the panel, and the luminance uniformity (B / U) characteristics are made by varying the transmittance of the center and periphery. Promote.

On the other hand, the coating liquid coating apparatus for applying the coating liquid to the panel will be described with reference to FIG.

The coating liquid applying apparatus is a spin method, and a spin coat (not shown) is rotated having a chamber 102 which is fixed and a circular plate 103 positioned in the center of the chamber 102 and rotated by a motor 101. The upper part of the circular plate 103 is provided with a coating liquid supply device (not shown), and a connection pipe (not shown) and a nozzle 106 having the coating liquid tank 104 and the regulator 105 are provided. It consists of.

Here, the disc plate 103 is formed with a panel-shaped groove and the panel 100 is mounted thereon, and the rotation speed is controlled by an RPM controller (not shown) connected to the motor 101.

The coating liquid coating apparatus configured as described above is equipped with the panel 100 on the circular plate 103, by pressing the coating liquid from the coating liquid tank 104 in a state in which the motor 101 is rotated at a predetermined rotation speed To adjust the amount with the regulator 105, it is dropped on the panel 100 to rotate through the nozzle to operate the coating film is applied.

Therefore, the panel coating film according to the present invention is applied to the first layer by injecting a predetermined amount of a coating liquid containing a colorant and a conductor capable of adjusting the transmittance while rotating the panel in a spin method. After applying the first layer, a second layer, which is an antireflection film, is applied by spin method, and finally, a third layer, which is an antireflection film, is applied by spray method.

As described above, the surface treatment system of the cathode ray tube according to the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed herein, and may be applied within the scope of the technical idea. Can be.

The color cathode ray tube according to the present invention constituted as described above comprises a silicon carbide in order for the panel coating film of the color cathode ray tube to efficiently adjust the transmittance and improve the film strength, so that the uniformity of brightness of the central and peripheral portions of the panel The characteristics and contrast characteristics can be improved, resulting in the effect of improving the reliability of the product.

1 is a view showing the structure of a common color cathode ray tube,

2 is a view showing the configuration of a panel coating film of a cathode ray tube according to the present invention;

3 is a diagram showing the configuration of a panel coating application device of a cathode ray tube according to the present invention.

<Explanation of symbols on main parts of the drawings>

50: first layer 51 of the panel coating film: pigment

53: silicon carbide 100: panel

Claims (4)

A panel having a flat outer surface with a constant curvature, a funnel mounted to the rear of the panel, an electron gun inserted into the neck of the funnel to emit an electron beam toward the screen, and arranged at regular intervals on the inner surface of the panel A color cathode ray tube comprising a shadow mask having a plurality of electron beam through holes, The coating film of the panel is a color cathode ray tube, characterized in that it comprises a metal particle, a pigment, a conductor, and silicon carbide (SiC) to improve the film strength and to adjust the transmittance. The method of claim 1, The coating film is a color cathode ray tube, characterized in that the ratio of the pigment and silicon carbide is 6: 4 to 7: 3. The method of claim 1, Said silicon carbide has a particle size of 70nm to 150nm color cathode ray tube. The method of claim 1, The metal particulate is a color cathode ray tube, characterized in that composed of one or more of the materials of indium tin oxide (ITO), antimony tin oxide (ATO), zirconium oxide (ZrO).