KR20040074791A - A Flat type Color CRT - Google Patents

Abstract

PURPOSE: A flat color cathode ray tube is provided to reduce eye fatigue by coating a non-glare film on the outer surface of the panel of the cathode ray tube. CONSTITUTION: A flat color cathode ray tube comprises a panel(1) having an inner surface on which a screen is formed; and a funnel(2) mounted on the rear surface of the panel. The panel has an outer surface including an anti-charge film(14) serving as an anti-electromagnetic interference film, an anti-reflection film(15), and a non-glare film(18). The non-glare film includes a colorant for compensation of light transmittance. The anti-glare film has densities different at the center of the panel and both ends of the panel.

Description

Flat color cathode ray tube {A Flat type Color CRT}

The present invention relates to a planar cathode ray tube, and more particularly, a surface of an electromagnetic wave shielding film and an antireflection film is coated on a panel surface such that the density of the center and both ends of the cathode ray tube is different so as to compensate for the brightness difference of the planar cathode ray tube. It relates to a panel for a cathode ray 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 to be less influenced by external geomagnetism, and a reinforcing band (12) installed around the side of the panel to prevent external impact. do.

In addition, there is a magnet 13 for correcting the trajectory of the electron beam 6 so as to strike the predetermined phosphor accurately, thereby preventing poor color purity. In addition, on the outer surface of the panel 1, an outer surface of the panel 1 includes an antistatic film formed of a material having good conductivity and an antireflection film formed of a material having a different refractive index on the outer surface of the panel 1. Apply.

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.

In general, the planar cathode ray tube used for the monitor should prevent the electromagnetic waves and minimize the reflection of the external light from the outside of the front part because the user sees the screen at a close distance.

Therefore, conventionally, as shown in FIG. 2, three coating films 10 formed of an antistatic film 14, an antireflection film 15, and a diffuse reflection film 16 are formed on an outer surface of the panel 1.

That is, one layer is an antistatic film 14, and constitutes an anti-static layer containing an electric conductor for electromagnetic wave prevention and antistatic, and the second layer is an antireflection film ( 15) Anti-glare layer, which constitutes an anti-reflection (hereinafter referred to as AR) layer, and the third layer diffusely reflects external light as a diffuse reflection film 16, thereby reducing external light reflection. (Anti-Glare, hereinafter referred to as AG.) Layer.

In general, although the AS layer 14 and the AR layer 15 alone have antireflection and electromagnetic wave prevention effects, the antireflection effect can be increased by adding the AG layer 16.

The panel 1 of the planar cathode ray tube as described above forms the outer surface of the front part of the panel 1 with a large radius of curvature close to the plane, and the inner surface of the fluorescent surface 4 is flat when the screen is viewed from the outside. The radius of curvature is formed with a radius of curvature relatively small compared to the outer surface of the panel 1 so as not to be damaged.

That is, as shown in FIG. 3, the panel 1 of the planar cathode ray tube has a different thickness between the center portion D ₂ and the both ends D ₁ of the front portion of the panel 1, and both ends D _1. ), It is thicker than the center (D ₂ ). Therefore, the amount of light that passes through the front center portion D ₂ and both ends D _{1 of the} panel ₁ is inevitably different.

Accordingly, the intensity of the light emitted from the phosphor layer 4 is due to the difference in the thickness of the panel 1, so that the brightness of the image of both ends D ₁ of the panel ₁ is the brightness of the center D ₂ image of the panel. It is lowered more.

For this reason, in the related art, a compensation coating layer 17 as shown in FIG. 4 is applied between the antistatic film 14 and the panel 1, and thus, due to the difference in the glass thickness between the center and the periphery of the panel 1 in the planar cathode ray tube. The light transmittance difference was compensated for.

In addition, Japanese Laid-Open Patent 2001-332196, Korean Laid-Open Patent 1999-0050749, and Korean Laid-Open Patent 2000-8507 are methods for compensating for the difference in transmittance between the center and both ends of a panel. It is introduced by forming. In Japanese Patent Laid-Open No. 5-182604, a method of compensating for the difference in transmittance by introducing different colorant densities on the front surface of a panel is introduced.

However, the prior art as described above does not simultaneously perform the role of light transmittance compensation and anti-reflective, or has a disadvantage in that it takes a lot of time and cost in the manufacturing process.

Therefore, although the picture of television or monitor cathode ray tube is ideally the same brightness screen with no difference in luminance between center and surroundings, the difference in light transmittance due to the difference in glass thickness of panel of flat cathode ray tube appears and luminance difference occurs. It was.

Accordingly, an object of the present invention is to solve the above-described problems, by forming a colored diffuse reflection film containing a coloring agent on the outer surface of the panel, to compensate for the light transmittance difference caused by the glass thickness difference between the center and the periphery of the flat cathode ray tube, It is an object of the present invention to provide a planar cathode ray tube that prevents diffuse reflection of external light.

1 is a schematic diagram of a flat color cathode ray tube

Figure 2 is a view showing a coating film of the panel and the panel outer surface according to the prior art.

Figure 3 is a view showing the light transmittance difference between the panel center portion and both ends of the panel during the electron beam scanning according to the prior art.

4 is a view showing a light transmittance compensation coating layer formed on the outer surface of the panel according to the prior art.

5 is a cross-sectional view of a flat color cathode ray tube glass structure according to the present invention;

6 is a view showing a process of forming a coating film on the outer surface of the panel of the flat color cathode ray tube according to the present invention.

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

1: panel 2: funnel

3: shadow mask 4: phosphor surface

7: frame 9: inner shield

14: antistatic film 15: antireflection film

16: diffuse reflection 18: colored diffuse reflection

D ₂ : Center panel D ₁ : Panel end

A first technical solution of the present invention for achieving the above object is a flat color cathode ray tube including a panel having a screen on the inner surface and a funnel mounted on the rear of the panel, the outer surface of the panel is an electromagnetic shielding film, reflection A prevention film, and a diffuse reflection film, wherein the diffuse reflection film is characterized in that it comprises a colorant for light transmittance compensation.

According to a second technical solution of the present invention, the diffuse reflection film is characterized in that the density at the panel center portion and at both ends of the panel is different from each other.

Further, a third technical solution of the present invention is characterized in that the diffuse reflection film contains at least one or more colorants of carbon (C) and titanium nitride (TiN).

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

As shown in FIG. 5, an antistatic film 14 for preventing electromagnetic waves is formed and an antireflection film 15 is formed for preventing reflection, as a method for compensating for the difference in luminance between the center and both ends of the planar color cathode ray tube. After that, a colored diffuse reflection film 18 including a semi-transparent coating solution containing a colorant such as carbon (C) or titanium nitride (TiN) and silicon oxide (SiO ₂ ) is coated on the outer surface of the antireflection film 14.

In the planar color cathode ray tube, as shown in FIG. 3, the curvature of the fluorescent surface 4 on the outer surface and the inner surface of the panel 1 is different so that the panel 1 is planarized, and the electron beam 6 is scanned on the fluorescent surface 4. When the phosphor is made to emit light to display an image, the luminance varies due to the difference in glass thickness of the panel.

As a result, the light transmittance difference generated in the panel 1 is compensated by the coating method of the present invention to minimize the light transmittance difference between the panel center portion D ₂ and both ends of the panel D ₁ .

In addition, in order to compensate for the luminance difference of the screen to be achieved in the present invention, the color diffuse reflection film 18 for compensating for light transmittance should be applied to the panel center portion D ₂ and the panel ends D ₁ in different amounts.

FIG. 6 is a diagram illustrating a process of applying an antistatic film 14, an antireflection film 15, and a color diffuse reflection film 18 for light transmittance compensation applied to an outer surface of the panel 1.

First, the antistatic film 14 is applied to the first layer having the electromagnetic wave protection function on the outer surface of the panel. The antistatic film 14 contains a colorant such as carbon (C) or titanium nitride (TiN) and silicon oxide (SiO ₂ ), which may reduce the transmittance of the panel, but the screen is formed at the same thickness as the center and the periphery. The difference in brightness is not compensated for.

In addition, an anti-reflection film 15 is applied to the second layer to reduce reflection of external light. Since the anti-reflection film 15 is generally composed of silicon oxide (SiO ₂ ), sometimes the anti-reflection film 15 may contain a colorant to reduce the transmittance. However, this also does not compensate for the light transmittance difference between the central portion (D ₂ ) and both ends (D ₁ ) of the panel (1).

Finally, the third layer has a central portion the carbon (C) and titanium nitride (TiN) at least one colorant and a silicon oxide (SiO ₂₎ a light transmittance of the colored irregular reflection film 18 for compensation contained in accordance with the present invention the panel (D ₂ Apply a lot to) and apply little to both ends of panel (D ₁ ).

As a coating method of the color diffuse reflection film 18 for light transmittance compensation as described above, a spray method using a nozzle is generally used, but it is important that the density of the particles to be applied is different.

That is, the method of apply | coating the colored diffuse reflection film 18 for light transmittance compensation is a method of controlling the moving speed of a nozzle. First, while spraying at the nozzle is made constant, the moving speed of the panel 1 is slowed down when the panel center portion D ₂ is applied, and the moving speed of the panel is applied when the both ends D _{1 of the} panel are applied. In order to speed up, the density of the light diffuse compensation colored diffuse reflection film 18 including the colorant applied to the panel center portion D ₂ and the panel ends D ₁ is different.

In addition, another method of applying the colored diffuse reflection film 18 for compensating the light transmittance is to apply the coating by adjusting the distance between the nozzle and the panel 1 so that the same spray amount is sprayed at the same speed. The distance of the panel 1 is shortened at the center portion D _{2 of the} panel ₁ , and is spaced apart at both ends D _{1 of the} panel, and a colored diffuse reflection film 18 for compensating for light transmittance including a colorant is applied.

Since one of the mountings of the present invention can be applied after the antistatic film 14 and the antireflective film 15 having an electromagnetic wave protection function, the method of separately configuring the brightness compensation coating layer 17 is unnecessary. There is no need for space and facilities for this. In addition, since a facility for applying the existing AG layer 16 may be used, a separate coating facility is unnecessary, and thus manufacturing cost may be reduced.

In addition, the process length is shorter than that of the separate brightness compensation coating layer 17, and thus, foreign material defects may be reduced, thereby improving yield.

In addition, the diffuse reflection film should be 1.1 times to 1.3 times the ratio of the maximum transmittance of the periphery of the panel to the center of the panel. .

That is, the conventional diffuse reflection film diffusely reflects external light evenly spray coating the whole, the transmittance ratio can not be compensated, because the transmittance ratio is lowered regardless of the amount and the amount of spray to spray coating.

On the contrary, the ratio of the transmittance of the peripheral portion of the panel to the center portion of the panel is greater than 1.3 times, which means that the central portion of the panel has a large amount of spray coating.

Therefore, it is preferable to form a colored diffuse reflection film so that light transmittance ratio may be within 1.1 times-1.3 times the maximum ratio of a panel periphery to a panel center part.

As such, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without changing the technical spirit or essential features thereof. 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, the present invention, by applying a colored diffuse reflection film containing a colorant to the outer surface of the flat color cathode ray tube, diffuse reflection of the external light to reduce the eye fatigue and at the same time function of the brightness compensation coating layer At the same time, the manufacturing cost is reduced, the process length is shortened and foreign matter defects are reduced accordingly, thereby improving the yield.

Claims (6)

A flat color cathode ray tube comprising a panel having a screen on an inner surface and a funnel mounted to a rear surface of the panel; The outer surface of the panel includes an electromagnetic wave prevention film, an antireflection film, and a diffuse reflection film, wherein the diffuse reflection film comprises a colorant to compensate for the light transmittance flat color cathode ray tube. The method of claim 1, The diffuse reflection film is a flat color cathode ray tube, characterized in that the density at the panel center and the panel ends. The method of claim 1, And a colored antireflection film attached to the anti-reflection film, wherein the anti-reflection film is attached to the panel, and the colored diffuse reflection film is attached to the anti-reflection film. The method of claim 1, The diffuse reflection film is a planar color cathode ray tube, characterized in that it comprises at least one colorant of carbon (C) and titanium nitride (TiN). The method of claim 1, The diffuse reflection film is a flat color cathode ray tube, characterized in that the ratio of the maximum transmittance of the panel peripheral portion to the panel center portion is 1.1 ~ 1.3. The method of claim 1, And said panel is substantially flat on its outer surface and has a predetermined curvature on its inner surface.