JP2847003B2 - CRT with functional film - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube with a functional film, in which a transparent conductive plastic film having various functions is attached to a surface of a face plate portion of the cathode ray tube.

[0002]

2. Description of the Related Art With the recent trend toward OA, FA, and personal computers, VDT (VIDEO D
ISP (TERMINAL) has been used by not only specialists but also ordinary users as before. VCR (VIDEO C)
With the spread of ASSETTE RECORDER, television sets with large screens have also been placed in ordinary homes so that powerful images like a movie theater can be enjoyed in a "home theater". Thus, high performance color cathode ray tubes are no longer special, but are routinely used by ordinary users. For this reason, it is desired that the cathode ray tube be further enhanced in function under various usage conditions.

One of the functions is an antistatic function for preventing the face surface from being charged up. With the increase in the size of the cathode ray tube and the improvement of the luminance performance and the focus performance, the voltage applied to the fluorescent screen of the cathode ray tube is increasing. For example, the voltage applied to the phosphor screen in a conventional 21-inch class color cathode-ray tube is about 25 to 27 kV.
A voltage as high as 4 kV is applied. Therefore, when the power of the television set is turned on and off, the outer surface of the face plate portion of the color cathode ray tube (hereinafter, referred to as the "face surface") is charged up, and dust and the like in the air adhere to the face surface to remove dirt. It becomes conspicuous, and as a result, deteriorates the performance of the color cathode ray tube such as luminance and resolution.

In the case of VDT work, since the display surface and the user are close to each other, a discharge phenomenon occurs when the user approaches the outer surface of the charged face plate when the power is turned on and off. The inconvenience of giving the viewer discomfort also occurs.

[0005] In an antistatic treatment type cathode ray tube, the charge charged up on the face surface is designed to have conductivity on the outer surface of the face plate so that the charge is released to the ground. As a method of imparting conductivity, a method of forming a transparent conductive film on the face surface is generally used.

Further, the reflection of external light on the face surface of the cathode ray tube makes video and character information of the cathode ray tube very difficult to see. As one of the methods for softening such reflection of external light and making the cathode ray tube more preferable for a viewer, there is a method of forming unevenness or an uneven film for scattering external light on the face surface.

FIG. 15 shows an example of the configuration of a cathode ray tube having such antiglare and antistatic functions. In the figure,
Reference numeral 1 denotes a neck portion having an electron gun built therein. 2 is a deflection yoke, 3 is a funnel part, 4 is a face plate part, 4a
Is a face surface, 5 is a high voltage button, the deflection yoke 2 is connected to a deflection power supply via a lead wire 2a, the high voltage button 5 is connected to a high voltage power supply via a lead wire 5a, and an electron gun (not shown) is a lead wire 1a. Connected to the drive power supply. 6 is a conductive uneven film formed on an uneven surface for anti-glare treatment, 7 is a metal explosion-proof band, 8 is a mounting ear, 9
Is a ground wire, 9a is a ground, 10 is a conductive tape or conductive paste, and 11 is a cathode ray tube as a whole.

The conductive unevenness film 6 is required to have sufficient conductivity, hardness to the extent that there is no practical problem, and adhesion to the face surface 4a. Therefore, a silica solution in which a conductive filler is dispersed is sprayed on the face by spraying. Spraying on surface 4a, relatively high temperature,
For example, it is generally formed by performing a baking process at 150 to 200 ° C. Examples of such a silica solution include an alcohol solution of silicon (Si) alkoxide, In ₂ O ₃ ; Sn (tin-containing indium oxide) and S
A conductive filler such as nO ₂ ; Sb (antimony-containing tin oxide) is mixed and dispersed.

When used in a television set,
In general, a technique of forming a color absorbing film having a color filter effect on the face surface 4a of a cathode ray tube for the purpose of improving the contrast, expanding the color reproduction range, and reducing external light reflection. A color absorption film having an absorption peak in transmittance for a certain wavelength is called a light selective absorption filter, and a color absorption film showing an almost constant transmittance spectrum over the entire visible light wavelength range is called a neutral filter. Both can be obtained by dispersing a plurality of dyes or pigments in a silica solution.

An antistatic function has also been obtained by combining and dispersing a conductive material in a silica solution. FIG. 16 shows a configuration of a functional plastic film having such a color filter function and an antistatic function. In the figure, reference numeral 12 denotes a conductive light absorbing film, which is composed of a silica-based film in which dye or pigment particles 13 and conductive particles 14 are dispersed.

When the conductive light absorbing film 12 is formed as a light selective absorption type filter, the absorption peak of the transmittance is designed between the emission spectra of the phosphor, so that the emission of the phosphor can be transmitted without wasting. It is possible to reduce the rate,
It is possible to improve the contrast, expand the color reproduction range, and improve the image quality by reducing the reflection of external light.

FIG. 17 is a diagram showing an example of the transmittance spectrum of the conductive color absorbing film 12. The characteristic B in the figure shows the spectral distribution of the relative emission intensity of blue light emitted from the fluorescent screen of the color cathode ray tube, and is approximately 450 nm. Has a main spectral wavelength. The characteristic R indicates the spectral distribution of the relative emission intensity of red light emission, and has a main spectral wavelength at about 626 nm. Further, the characteristic G indicates a spectral distribution of the relative light emission intensity of green light emission.

A characteristic I in the figure shows an example of a spectral transmittance distribution when the conductive light absorbing film 12 is configured as a light selective absorption film type filter. If there is an absorption peak at a portion near the main spectrum wavelength among the main spectrum wavelengths of 535 to 626 nm, it is disadvantageous in the luminance performance of the phosphor screen of the color cathode ray tube. ~ 610n
The absorption peak of the absorption band is set in the range of m. Since light having a wavelength in this range coincides with a region where the visibility of human eyes is relatively high, it is preferable in terms of contrast performance that light in this region of the external light (white light) component is absorbed and removed.

The characteristic II in FIG.
2 shows an example of a spectral distribution when the neutral filter 2 is configured as a neutral filter. The transmittance of the face panel, which is originally determined by the glass material and the wall thickness, can be controlled quite freely, and the fluorescent light The luminous efficiency and transmittance of the body can be optimized, and the same image quality can be improved.

FIG. 18 is a characteristic diagram for explaining the antistatic function of the conductive absorbing film 12, wherein the power of the cathode ray tube is turned on and off.
The potential change of the face surface 4a when the FF is performed is represented by a characteristic M in FIG.
And M1, and the charge-up is significantly smaller than the characteristics L and L1 without the antistatic function.

Next, as another method of providing an antistatic function on the face of the cathode ray tube, instead of directly adding an antistatic function to the surface of the face of the cathode ray tube, an antistatic treatment is applied to the transparent plastic film substrate. After giving
A film in which the film is adhered to the face is disclosed in Japanese Patent Application Laid-Open No. 3-131180.
FIG. 19 shows such a functional plastic film 15.
FIG. 3 is a view showing a configuration of a face plate portion of a cathode ray tube having an antistatic function by a transparent plastic film substrate 16;
And a transparent conductive film (hereinafter, referred to as “conductive film”) 17 formed on the surface thereof, and is adhered to the face surface 4 a of the cathode ray tube by an adhesive 18.

[0017]

According to the method of forming a silica-based coating film on the face of a cathode ray tube, a baking process at 100 to 200 ° C. is required to obtain sufficient conductivity and strength. However, there is a problem that the cost is high due to a large utility cost and equipment cost.

The work of removing the film after baking due to poor coating (salvage and regeneration work) has been extremely difficult.

Further, in the configuration in which the functional plastic film is attached to the face surface of the cathode ray tube, it is not necessary to heat-treat the cathode ray tube only by attaching the functional film with an adhesive. However, the functions that can be achieved by the conventional functional plastic film are limited to the antistatic function and the contrast improving function.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to obtain a cathode ray tube with a functional film which has various functions required for a color cathode ray tube.

[0021]

According to the present invention, there is provided a functional film in which a conductive film and a light absorbing film having a color filter function are formed on the surface of a transparent plastic film substrate.
It is attached to the face of a cathode ray tube.

Further, a functional film in which a conductive film, a light absorbing film, and a concavo-convex film are formed on the surface of a transparent plastic film substrate is attached to the face surface of a cathode ray tube.

Further, a functional film in which a conductive film, a light absorbing film having a color filter function, and an antireflection film are formed on the surface of a transparent plastic film substrate is attached to the face surface of a cathode ray tube.

Further, a functional film in which an uneven film or an antireflection film is formed on the surface of a transparent conductive plastic film substrate is attached to the face surface of a cathode ray tube.

Also, a functional film formed by arranging a light absorbing film having a light selective color filter function or a light absorbing film having a light selective color filter function having an uneven surface on the surface of a transparent conductive plastic film substrate. Is attached to the face surface of a cathode ray tube.

Further, a functional film in which an uneven film or an antireflection film is formed on the surface of a transparent conductive plastic film substrate having a color filter function is attached to the face surface of a cathode ray tube.

[0027]

According to the present invention, there is provided a function in which a conductive film, a light absorbing film having a color filter function, and a concavo-convex film or an anti-reflection film are formed on the surface of a transparent plastic film substrate alone or in combination. Since the film is attached to the face surface of the cathode ray tube, a cathode ray tube having characteristics obtained by adding the functions of the respective formed films can be obtained.

A functional plastic film formed by combining a light absorbing film and a concavo-convex film singly or in combination on the surface of a conductive transparent plastic film substrate is attached to the face surface of a cathode ray tube. Therefore, a cathode ray tube having characteristics obtained by adding the function of the plastic film substrate and the function of each formed film can be obtained.

Further, a functional film in which a concavo-convex film or an anti-reflection film is formed on a transparent plastic film substrate having a color filter function or a conductivity and a color filter function is attached to the face surface of a cathode ray tube. Therefore, a cathode ray tube having characteristics obtained by adding the function of the plastic film substrate and the function of each formed film can be obtained.

[0030]

[Embodiment 1] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG.
1 shows a configuration of a cathode ray tube with a functional plastic film according to Example 1, and FIG. 2 is an enlarged sectional view of a portion A thereof.
In the figure, reference numeral 19 denotes a functional plastic film adhered to the face surface 4a. This film 19 is composed of a transparent plastic film substrate 16, a conductive film 17 formed on the surface thereof, and a light selective absorption formed on the surface. Membrane 2
The transparent plastic film substrate 16 is bonded to the face surface 4a with an adhesive 18 on the back surface side.

The conductive film 17 of the first embodiment is connected to the metallic explosion-proof band 7 with a conductive tape or conductive paste 10 as shown in FIG. . Further, since the light absorbing film 20 is adjusted to the characteristic I shown in FIG. 17, the cathode ray tube of the first embodiment has an antistatic function and a contrast improving function.

Embodiment 2 FIG. FIG. 3 is an enlarged cross-sectional view (hereinafter simply referred to as an A-part enlarged cross-sectional view) corresponding to a portion A in FIG. 1A according to a second embodiment of the present invention.
6, a conductive film 17, and a neutral filter 21, and have an antistatic function and a contrast improving function.

In the distribution of the spectral transmittance of the neutral filter of the second embodiment, the average transmittance in the visible light region is adjusted to about 80% as shown by the characteristic II in FIG. Have.

Embodiment 3 FIG. FIG. 4 is an enlarged sectional view of a portion A of Example 3 of the present invention, in which a functional plastic film 19 is composed of a transparent plastic film substrate 16, a conductive film 17, a light selective absorption film 20, and a concavo-convex film 22. It has an antistatic function, a contrast improving function, and an antiglare function.

Embodiment 4 FIG. FIG. 5 is an enlarged cross-sectional view of a portion A of Example 4 of the present invention, in which the functional plastic film 19 is formed of a transparent plastic film 16, a conductive film 17, a light selective absorption film 20, and a multilayer optical thin film. And a membrane 23,
It has an antistatic function, a contrast improving function, and an antireflection function.

FIG. 6 is a characteristic diagram of the anti-reflection film 23. A characteristic A shows the surface spectral reflectance when the anti-reflection film 23 is not provided.
It has an average surface reflectance of about 4% in the visible light range. On the other hand, when the antireflection film 23 composed of the two-layer optical thin film is provided, as shown in the characteristic (b), the average is 1.3% in the visible light region.
The surface reflectance can be suppressed to a certain degree, and the surface reflectance can be adjusted by adjusting the number of layers of the optical thin film, the refractive index of each layer, and the film thickness of each layer.

The anti-reflection effect can be obtained by using an optical thin film material having a different refractive index from a material having a high refractive index / a material having a low refractive index / a material having a high refractive index /... Expressed by alternately laminating like a refractive index material. Magnesium boride (MgF ₂ ),
Silicon oxide (SiO ₂ ) or the like is used, and titanium oxide (TiO ₂ ), tantalum oxide (Ta)
₂ O ₅ ), zirconium oxide (ZrO ₂ ), zinc sulfide (ZnS) and the like are used.

Embodiment 5 FIG. FIG. 7 is an enlarged sectional view of a portion A of Embodiment 5 of the present invention, in which a functional plastic film 19 is provided with a transparent plastic film substrate 16, a conductive film 17, and a neutral filter 21.
And an uneven film 22 having an antistatic function, a contrast improving function, and an antiglare function.

Embodiment 6 FIG. FIG. 8 is an enlarged cross-sectional view of a portion A of Embodiment 6 of the present invention, in which the functional plastic film 19 includes a transparent plastic film substrate 16, a conductive film 17, and a neutral filter 2.
1 and an antireflection film 23, and has an antistatic function, a contrast improving function, an antireflection function, and an antiglare function.

FIG. 9 is an enlarged sectional view of a part A of an improvement plan related to the present invention , in which a functional plastic film 19 comprises a plastic film substrate 24 having a light selective absorption function provided with a light selective absorption function, a conductive film 17 and a conductive film 17. And has an antistatic function and a contrast improving function. In this case, the plastic film substrate 2 with the light selective absorption function
No. 4 has a specific color tone, but the haze (whiteness) value is small, so that the plastic film substrate itself can be said to be transparent.

FIG. 10 is an enlarged sectional view of a part A of another improvement plan related to the present invention.
Is a plastic film substrate 25 having a neutral filter function in which a dye or pigment is dispersed, and a conductive film 17
And an uneven film 22, which has an antistatic function,
It has a contrast improving function and an anti-glare function. In this case, the plastic film substrate 25 with the neutral filter function has a small haze value similarly to the above-mentioned plastic film substrate with the light selective absorption function, so that the plastic film substrate itself can be said to be transparent.

FIG. 11 shows still another improvement related to the present invention.
In A enlarged sectional view of the plan, functional plastic film 1
9 comprises a plastic film substrate 25 with a neutral filter function, a conductive film 17, and an antireflection film 23, and has an antistatic function, a contrast improving function, and an antireflection function.

Embodiment 7 FIG. FIG. 12 shows a transparent conductive plastic film substrate 26 having a surface coated with a functional plastic film 19 in which a silica-based solution is applied by a spraying method to form a concavo-convex film 22, with an antiglare function and an antistatic function. A of cathode ray tube
It is a part enlarged sectional view. The external light hitting the face surface 4a is
Since the reflected light is reduced due to irregular reflection caused by the unevenness formed on the surface of the uneven film 22, the image and the character information displayed on the cathode ray tube become easy to see. Various types of transparent conductive plastic film substrates are widely known. For example, Vo substrate published in 1980 in the magazine "Surface"
l. 18, No. 8, pages 440 to 449, a polymer electrolyte is applied to the surface of a polymer film or formed by kneading a polymer into a film. . Since the plastic film substrate 26 itself has conductivity, it is not necessary to make the silica solution for forming the uneven film 22 conductive. For this reason,
The necessity of dispersing the conductive filler in the silica solution was eliminated, and the haze (whiteness) of the uneven film 22 could be reduced.

Since the formation of the uneven film 22 can be performed by processing only the functional plastic film 19, the equipment and steps for forming the uneven film are simplified, and the uneven film can be obtained at low cost. For sticking to the cathode ray tube,
This is performed at the final film sticking stage, so that it is possible to impart antistatic properties and prevent a decrease in production efficiency due to a defect in forming the uneven film. Further, even when a film defect is found after the application, or when the application is defective, the functional film 19 only needs to be peeled off, so that salvaging can be performed relatively easily.

Embodiment 8 FIG. FIG. 13 is an enlarged cross-sectional view of a portion A of a cathode ray tube having an antireflection function and an antistatic function, in which a functional plastic film 19 having an antireflection film 23 formed on the surface of a transparent conductive plastic film substrate 26 is adhered. Here, the antireflection film 23 is formed of the transparent conductive plastic film substrate 2.
A multilayer optical thin film is formed on the substrate 6 by vapor deposition or coating, thereby providing an antireflection effect.

Embodiment 9 FIG. FIG. 14 shows a silica-based smooth light absorbing film 2 having a light selective absorption type color filter function by dispersing a plurality of dyes or pigments on the surface of a transparent conductive plastic film 26.
FIG. 2 is an enlarged cross-sectional view of a portion A of the cathode ray tube in which 0 is formed. By selecting a plurality of dyes or pigments and optimizing the mixing ratio, a light selective absorption type transmission spectrum as shown by the characteristic I in FIG. 17 could be obtained. The body color of the light selective absorption film 20 is the face plate portion 4.
It is desirable to achromaticize including the body color of the phosphor screen formed on the inner surface of the substrate.

The characteristics of the color filter are 550n
There was a minimum peak of about 75% in the vicinity of m to 580 nm, and an average transmittance of about 85% in the visible light range of 380 nm to 730 nm could be obtained. The peak transmittance and the average transmittance can be controlled by adjusting the concentration of the dye or the pigment. Also,
Since the substrate film 26 itself has conductivity, it is not necessary to disperse the charging material in the silica-based light selective absorption film 20. As a result, the transparency of the light selective absorption film 20 was improved, and the film strength was significantly improved.

Embodiment 10 FIG. In the ninth embodiment, the light selective absorption type is described as the color filter. However, the same can be said when a neutral filter having a substantially flat transmission spectrum in the visible light region is formed.

Embodiment 11 FIG. The light selective absorption film 20 is not a smooth film, but is formed by coating a silica solution in which a dye or a pigment is dispersed by a spraying method to form an uneven film, and has a color filter function, an antistatic function, and an antiglare function. Can also be given.

[0050]

According to the present invention, a functional film in which a conductive film and a light absorbing film having a color filter function are formed on the surface of a transparent plastic substrate is attached to the face surface of a color cathode ray tube. Thus, a cathode ray tube having an antistatic function and a contrast improving function can be obtained.

Further, since the functional film is provided with the conductive film, the light absorbing film, and the uneven film, the cathode ray tube has an antistatic function, a contrast improving function, and an antiglare function. Can be obtained.

In addition, since the functional film is provided with a conductive film, a light absorbing film having a color filter function, and an antireflection film, an antistatic function, a contrast improving function,
A cathode ray tube having a function of preventing reflection of external light can be obtained.

Further, since the functional film is composed of a transparent plastic film substrate having conductivity and an uneven film, a cathode ray tube having an antistatic function and an antiglare function can be obtained without providing a conductive film. Can be.

Further, since the functional film is composed of a transparent plastic film substrate having conductivity and an antireflection film, a cathode ray tube having an antistatic function and an antireflection function can be obtained without providing a conductive film. be able to.

Further, the functional film is composed of a transparent plastic film substrate having conductivity and a light absorbing film having a light selective color filter function or a light absorbing film having a light selective color filter function having an uneven surface. Thus, a cathode ray tube having an antistatic function, a contrast improving function, and an antiglare function can be obtained without providing a conductive film.

Further, since the functional film is composed of a transparent plastic film substrate provided with light absorption and conductivity, and a concavo-convex film, an antistatic function and a contrast can be obtained without providing a light absorption film or a charging film. A cathode ray tube having an improving function and an anti-glare function can be obtained.

Further, since the functional film is composed of a transparent plastic film substrate provided with light absorption and conductivity and an antireflection film, an antistatic function without providing a light absorption film or a conductive film, and A cathode ray tube having a contrast improving function and an antireflection function can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a first embodiment of the present invention.

FIG. 2 is a part of the face panel unit according to the first embodiment;
It is an A section expanded sectional view in the inside.

FIG. 3 is an enlarged sectional view of a portion A of Embodiment 2 of the present invention.

FIG. 4 is an enlarged sectional view of a portion A in Embodiment 3 of the present invention.

FIG. 5 is an enlarged sectional view of a part A according to a fourth embodiment of the present invention.

FIG. 6 is a characteristic diagram of the antireflection film of Example 4.

FIG. 7 is an enlarged sectional view of a portion A according to a fifth embodiment of the present invention.

FIG. 8 is an enlarged sectional view of a portion A according to a sixth embodiment of the present invention.

FIG. 9 is an enlarged sectional view of a portion A of an improvement plan related to the present invention.

FIG. 10 is an enlarged sectional view of a part A of another improvement plan related to the present invention.

FIG. 11 is an enlarged sectional view of a part A of still another improvement plan related to the present invention.

FIG. 12 is an enlarged sectional view of a portion A according to a seventh embodiment of the present invention.

FIG. 13 is an enlarged sectional view of a portion A in Embodiment 8 of the present invention.

FIG. 14 is an enlarged sectional view of a portion A in Embodiment 9 of the present invention.

FIG. 15 is a side view of a conventional cathode ray tube having an antistatic function and an antiglare function.

FIG. 16 is a partially enlarged sectional view of a face plate portion of a conventional cathode ray tube having an antistatic function and a contrast improving function.

FIG. 17 is a characteristic diagram of a color filter that obtains a contrast improving function.

FIG. 18 is a diagram showing charge characteristics of a face surface having an antistatic function.

FIG. 19 is a partially enlarged cross-sectional view of a face plate portion of a conventional cathode ray tube in which a functional plastic film is attached to a face surface.

[Explanation of symbols]

Reference Signs List 4 face plate portion 4a face surface 11 cathode ray tube 16 transparent plastic film substrate 17 transparent conductive film 18 adhesive 19 functional plastic film 20 light selective absorption film 21 neutral filter (light absorption film) 22 uneven film 23 anti-reflection film (multi-layer metal) 24) Plastic film substrate with light selective absorption function 25 Plastic film substrate with neutral filter function 26 Transparent conductive plastic film

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-1-278800 (JP, A) JP-A-2-82434 (JP, A) JP-A-4-184846 (JP, A) JP-A-4-184846 67545 (JP, A) JP-A-64-79041 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01J 29 / 88,29 / 89 G02B 1/10

Claims (6)

(57) [Claims] 1. A conductive film is provided on a surface of a transparent plastic film substrate, and a light absorbing film having a color filter function is disposed on the surface of the conductive film to form a functional film. A cathode ray tube with a functional film formed by bonding a plastic film substrate to the face of a cathode ray tube. 2. A conductive film is provided on a surface of a transparent plastic film substrate, a light absorbing film having a neutral filter function is provided on the surface of the conductive film, and an uneven film is arranged on the surface of the light absorbing film. A cathode ray tube with a functional film formed by forming a film and bonding the transparent plastic film substrate of the functional film to the face surface of the cathode ray tube. 3. A functional film is formed by providing a conductive film on the surface of a transparent plastic film substrate, providing a light absorbing film having a color filter function on the surface of the conductive film, and further arranging an antireflection film on the surface. A cathode ray tube with a functional film, wherein the transparent plastic film substrate of the functional film is adhered to the face of the cathode ray tube. 4. A functional film is formed by arranging a concavo-convex film or an anti-reflection film on the surface of a transparent conductive plastic film substrate, and the transparent conductive plastic film substrate of the functional film is placed on the face of a cathode ray tube. Cathode ray tube with a functional film adhered to 5. A functional film is formed by disposing a light-absorbing film having a light-selective color filter function or a light-absorbing film having a light-selective color filter function having an uneven surface formed on the surface of a transparent conductive plastic film substrate. A cathode ray tube with a functional film, wherein the transparent conductive plastic film substrate of the functional film is adhered to the face of the cathode ray tube. 6. A functional film is formed by disposing an uneven film or an antireflection film on the surface of a conductive plastic film substrate having a color filter function, and the conductive plastic film substrate of the functional film is connected to a cathode ray tube. A cathode ray tube with a functional film adhered to the face surface.