JP2667068B2 - Color cathode ray tube with light selective absorption layer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube provided with a light selective absorption layer on the inner surface of a face plate and a functional film such as an antistatic film or a low reflection film on the outer surface. Things.

[0002]

2. Description of the Related Art The voltage applied to the fluorescent screen of a color cathode ray tube, that is, the acceleration voltage of an electron beam, has been increasing with the recent enlargement of the color cathode ray tube and the improvement of the luminance performance and the focus performance. In the recent 30-inch or more color cathode ray tubes, a high voltage of 30 to 34 kV is applied to the fluorescent screen.

[0003] Therefore, when the power of the color television receiver is turned on and off, the outer surface of the face plate portion of the color cathode ray tube is charged up, and fine dust in the air is deposited on the outer surface of the face plate portion. This causes adhesion and makes dirt more conspicuous, resulting in deterioration of the luminance performance of the color cathode ray tube. Further, when a viewer approaches the outer surface of the charged face plate portion, a discharge phenomenon occurs, which may cause inconvenience to the viewer.

In order to eliminate the charge-up phenomenon on the outer surface of the face plate portion of the color cathode ray tube, a smooth transparent conductive film on the outer surface of the face plate portion of the color cathode ray tube. Recently, a color cathode ray tube with a functional film of an antistatic treatment type in which a charge is released to the ground by forming a film has been generally used.

FIG. 5 is a view for explaining the principle of the above-described antistatic treatment type of a color cathode ray tube with a functional film, which is designed to prevent static charge.
In FIG. (6) has a built-in neck, an electron gun (not Figure shown). (7) is a deflection yoke, (13) is a funnel portion, (4) is a face plate portion, (5)
Is a high-pressure button, and the deflection yoke (7) is a lead wire (7).
a) to the deflection power supply, and the electron gun to the lead wire (6).
a) and the high-voltage button (5) is connected to the high-voltage power supply via a lead wire (5a). The neck portion (6) in the color cathode ray tube having the above configuration.
Deflection yoke (7) for the electron beam emitted from the built-in electron gun
, Electromagnetically deflects from the outside of the color cathode ray tube, while applying a high voltage to the fluorescent screen provided on the inner surface of the face plate section (4) via the high voltage button (5). As a result, the electron beam is accelerated, and the phosphor screen is excited and emits light by the energy to extract light output. As described above, the potential of the outer surface of the face plate portion (4) changes due to the effect of the high voltage applied to the fluorescent screen on the inner surface of the face plate portion (4), and adverse effects such as adhesion of dust occur. .

Therefore, as a countermeasure for eliminating such adverse effects, as shown in FIG. 5, a smooth transparent conductive film, that is, an antistatic treatment type functional film (1) is formed on the outer surface of the face plate portion (4). The functional film (1) of the antistatic treatment type is grounded from the conductive tape (12) through the metal explosion-proof band (8) and the mounting ear (9) welded to the ground wire (1).
A color cathode ray tube (3) with a functional film of an antistatic treatment type is joined to the ground (10A) by 0) so as to always release the charge to the ground and prevent charge up.

A smooth transparent conductive film formed on the outer surface of the face plate portion (4), that is, a functional film (1) of an antistatic treatment type is generally required to have strength, that is, a certain degree of hardness and adhesiveness. A silica (SiO ₂ ) -based film is formed.

Conventionally, as one method of forming this silica (SiO ₂ ) -based smooth transparent conductive film, ie, an antistatic treatment type functional film (1), a functional group such as —OH group or —OR group is used.
An alcohol solution of silicon (Si) alkoxide having a base or the like is applied to a face plate portion of a color cathode ray tube (4)
After that, the outer surface is uniformly and smoothly applied by a spin coating method or the like, and then subjected to a baking treatment at a relatively low temperature, for example, 100 ° C. or less.

FIG. 6 shows porous silica (Si) formed on the outer surface of the face plate portion (4) by such a method.
O ₂ ) -based film (19), antistatic treatment type functional film (1), black light absorbing layer 14, BGR three-color phosphor layer (15) formed on inner surface of face plate portion (4), metal It is an expanded sectional conceptual diagram for demonstrating the conventional fluorescent screen which consists of a back layer (16).

The silica (Si) formed as described above
Since the O ₂ ) -based film (19) is porous and has a silanol group (≒ Si—OH), it can adsorb moisture in the air and lower the surface resistance. However, such a porous silica (SiO ₂₎ based film (19) in dry time longer With the surface resistance value will be taken in not moisture is missing in the porous during the via in an environment <br/> There is a problem that it rises.

As another method for fundamentally solving this problem, tin oxide (Sn) is used as a conductive filler in the alcohol solution of the alkoxide of silicon (Si).
O ₂₎ and added fine particles such as indium oxide (In ₂ O _3), by using a coating solution obtained by adding a small amount of P (phosphorus) or Sb (antimony) to impart semiconductive property causes mixing and dispersing the color The outer surface of the face plate portion (4) of the cathode ray tube is uniformly and smoothly applied by a spin coating method or the like in the same manner as before, and a relatively high temperature (for example, 100 ° C.)
(-200 ° C.).

FIG. 7 is an enlarged schematic sectional view of the fluorescent screen for explaining the antistatic treatment type functional film (1) formed by such a method, and is formed on the outer surface of the face plate portion (4). The porous silica (SiO ₂ ) based film (1
Since 9) conductive filler particles (17) in the presence, can be any resistance even in an environment to obtain a time-varying and not stable antistatic treatment type functional film (1) through.

Conventionally, an antistatic treatment of a color cathode ray tube has been performed by such a method. However, along with a recent strong demand for higher image quality of color televisions, this silica (SiO ₂ ) -based film (19) has been used. ) Has been put to practical use, in which the color and the emission color tone of the color cathode ray tube are also improved by coloring them.

That is, the conventional antistatic treatment type functional film (1)
Using a coating liquid for obtaining a base coating, a color selective light absorbing coating liquid is prepared by mixing inorganic or organic pigment or dye particles therein, and a face of a color cathode ray tube is formed by a conventional spin coating method or the like. A color cathode ray tube with an antistatic / light selective absorption type functional film having both an antistatic function and a light selective absorption function by coating and forming a film on the outer surface of the plate portion (4) is completed.

FIG. 8 is an enlarged conceptual sectional view of a phosphor screen for explaining such an antistatic / light selective absorption type functional film (1). Porous silica (SiO ₂ ) film (19)
In addition to the conventional conductive filler particles (17), inorganic or organic pigment or dye particles (18) are dispersed and mixed therein.

FIG. 11 is a view for explaining the optical characteristics of such an antistatic / light selective absorption type functional film (1). In the figure, (B) shows the spectral distribution of the relative emission intensity of blue light emitted from the fluorescent screen of the color cathode ray tube, and has a main spectral wavelength at about 450 nm. Similarly, (G) and (R) show the spectral distributions of the relative emission intensities of green emission and red emission, respectively, and have main spectral wavelengths at 535 nm and 625 nm, respectively. (III) and (IV) show the spectral transmittance distribution of the face plate portion (4) on which the fluorescent surface of the color cathode ray tube is formed, and (III) shows that the spectral transmittance in the visible light region is about 85. % Clear type,
(IV) shows a tint type of about 50%.

The lower the spectral transmittance of the face plate portion (4), the more disadvantageous the luminance performance of the fluorescent screen of the color cathode ray tube is. (B), (G), (R) Relative luminous intensity of the fluorescent screen As is clear from the relationship with the spectral distribution of, the external light incident on the phosphor screen of the color cathode ray tube can be effectively removed, so that the contrast performance is advantageous, along with the recent tendency to emphasize the image quality of color television, At present, tint type face plate portions (4) are often used.

In the figure, (I) shows the spectral transmittance of the antistatic / light selective absorption type functional film (1) formed on the outer surface of the face plate portion (4) as described above to further enhance the contrast performance. An example of the distribution is shown. (G), (R)
Has a main absorption peak (K) at 585 nm between the main spectral wavelengths in the spectral distribution of the relative light emission intensity. Also, 495 nm between the main spectral wavelengths of the relative emission intensity spectral distributions of (B) and (G), and the shorter wavelength side of the main spectral wavelength of the relative emission intensity spectral distribution of (B).
It has secondary absorption peaks (L) and (M) at 10 nm.

Since the main absorption peak (K) coincides with a region where the visibility of the human eye is relatively high, it is preferable in terms of contrast performance if light in this region of the external light (white light) component is absorbed and removed. . Although the side absorption peaks (L) and (M) have some effect of improving the contrast performance, the effect of adjusting the body color of the phosphor screen is rather large. That is, if only the main absorption peak (K) is provided, only the yellow component of the external light (white light) component is removed, and the body color of the phosphor screen becomes bluish purple. The body color of the phosphor screen is preferably an achromatic color from the viewpoint of image quality of color television, and if it becomes bluish purple, pure black cannot be expressed, which is not preferable. The two sub-absorption peaks (L) and (M) allow the body color to be well balanced and achromatic.

FIG. 12 is another example showing the optical characteristics of the antistatic / photoselective absorption type functional film (1). (II) in the figure shows an example of the spectral transmittance distribution of the antistatic / light selective absorption type functional film (1) formed on the outer surface of the face plate portion (4). In this case, the main absorption peak (K) is located at 572 nm between the main spectral wavelengths of the relative emission intensity spectral distributions of (G) and (R), and the main spectral wavelength of the relative emission intensity spectral distribution of (B) is shorter. 410nm on the wavelength side
Has a secondary absorption peak (M). In this case, the body color can be adjusted by the two absorption peak wavelengths of the main absorption peak (K) and the sub absorption peak (M) and the amount of absorption.

As described above, the antistatic / light selective absorption type functional film (1) has a relatively high optical characteristic of human eye visibility and a small influence of light emission from the phosphor screen at 570 n.
A main absorption peak (K) is set in the range of m to 610 nm, and a sub-absorption peak is provided in a wavelength band that does not affect light emission from the phosphor screen as much as possible, so that body color is adjusted. By providing such an absorption peak, it is possible to improve the contrast performance by effectively absorbing external light while maintaining the luminance performance of the phosphor screen and maintaining the achromatic color of the body color. As described above, in order to realize an achromatic body color, it is important to provide two or more absorption peaks.

With respect to the optical characteristics of the antistatic / photoselective absorption type functional film (1), it is very important to select an inorganic or organic pigment or dye, and to obtain the optical characteristics of one absorption peak. In addition, two or more kinds of pigments and dyes are mixed, and a more complicated mixing form is obtained when a plurality of absorption peaks are provided.

With the recent strong demands for higher image quality of color televisions, the face performance has been improved in order to improve the contrast performance in various ways as described above.
The lower the light transmittance of the plate portion (4), the more the anti-static property is applied to the outer surface of the face plate portion (4).
As the light transmittance is reduced by providing the light selective absorption type functional film (1), the reflection of light outside the surface of the face plate (4) becomes more conspicuous, and the viewer reflects the reflection. Problems have arisen, such as difficulty in viewing images and eye fatigue for viewers.

As a countermeasure against this reflection, the antistatic / light selective absorption type functional film (1) provided on the outer surface of the face plate portion (4) is provided with an additional function to prevent the reflection.
A light selective absorption / low reflection type functional film (1) has been proposed by the present applicant and the like.

FIG. 9 shows such antistatic / light selective absorption /
FIG. 2 is an enlarged conceptual sectional view of a phosphor screen for explaining a configuration of a low reflection type functional film (1). In this case, the functional group is -OH
An alcohol solution of silicon (Si) alkoxide having a base group, —OR group, is used as a base paint, and conductive filler particles for imparting conductivity and an inorganic or A conventional low-refractive-index base coating in which ultrafine magnesium fluoride (MgF ₂ ) having an average particle size of 1000 ° or less for dispersing and mixing an organic pigment or dye particles and lowering the refractive index of a coating film is added. A low-refractive-index layer (21) is formed by applying a uniform film thickness on the outer surface of the face plate portion (4) of the color cathode ray tube by a similar spin coating method or the like.
This low refractive index layer (21) is made of a conventional porous silica (Si).
O ₂ ) -based film (19) contains conductive filler particles (1).
7) Ultrafine magnesium fluoride (MgF ₂ ) (20) for lowering the refractive index of the film by adding inorganic or organic pigment or dye particles (18) is dispersed and mixed.

The optical monolayer type antistatic / light selective absorption / low reflection type functional film (1) composed of a single layer of the low refractive index layer (21) has a refractive index and a thickness of the low refractive index layer. Control is important to obtain the desired low reflectance properties.
FIG. 13 (a) shows the surface spectral reflectance of the antistatic / light selective absorption type functional film (1), which has a surface reflectance of about 4% in the visible light region. On the other hand, the surface spectral reflection of the optical monolayer type antistatic / light selective absorption / low reflection type functional film (1) obtained by controlling the refractive index and the film thickness of the low refractive index layer (21) to be constant. The rates are shown in (b). In this case, the surface reflectance in the visible light region can be reduced to about 1.5%.

FIG. 10 is an enlarged conceptual sectional view of a fluorescent screen for explaining another example of the structure of the functional film (1) of the antistatic / light selective absorption / low reflection type. In this case, an optical multilayer type antistatic / light selective absorption / low reflection type functional film is formed by a combination of two layers of a high refractive index layer (22) and a low refractive index layer (21) having a predetermined refractive index and film thickness. (1) is constituted.

The high refractive index layer (22) is made of porous silica (S
The conductive filler particles (1) are contained in an iO ₂ ) -based film (19).
7), in addition to inorganic or organic pigment or dye particles (18), ultra-fine particle high refractive material (1) for increasing the refractive index
Dispersion mixing to which 1) was added is performed. Titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂ O ₅ ), zirconium oxide (ZrO ₂ ), zinc sulfide (ZnS), or the like having an average particle diameter of 1000 ° or less is used as the ultrafine particle high refractive material. The low-refractive-index layer (21) has the same configuration as the low-refractive-index layer (21) constituting the optical single-layer type antistatic / light-selective absorption / low-reflection type functional film (1) described above, and therefore description thereof is omitted. .

The high refractive index layer (22) and the low refractive index layer (2)
The optical multilayer antistatic / light selective absorption / low reflection type functional film (1) constituted by the combination of the above (1) obtains low reflection characteristics in which the control of the refractive index and the film thickness of both high and low refractive index layers is desirable. It is important for. FIG. 13C shows the surface spectral reflectance of the optical multilayer antistatic / light selective absorption / low reflection type functional film (1). By properly controlling the refractive index and film thickness of the high and low refractive index layers, the surface reflectance in the visible light region can be reduced to about 1.0%.

In the case of the optical multi-layer type low reflection film composed of a combination of the high and low refractive index layers, the higher the number of layers, the lower the surface reflectance can be realized. In the case of film formation, it is difficult to control the film thickness delicately and to prevent variations.
The layers are considered the limit of the number of layers.

In the case of the functional film (1) provided on the outer surface of the face plate (4) of the color cathode ray tube as described above, functions such as an antistatic function, a light selective absorption function, and a low reflection function are added. Each time, the kind and amount of different materials added to the porous silica (SiO ₂ ) -based film (19) as a base increases. This dissimilar material is a functional film (1)
To it in order to add a new guess function is essential, silica (SiO ₂₎ poor in <br/> with adhesion to the hardness and glass as compared to the number, functional film of these different materials ( The increase in the amount added to 1) has a very big problem from the viewpoint of the strength of the functional film (1).

Methods for evaluating the strength of the functional film (1) provided on the outer surface of the face plate portion (4) of such a color cathode ray tube include a pencil hardness measurement and an eraser test. The pencil hardness measurement is to evaluate the hardness of the film by checking whether a scratch is left on the film surface when a pencil of various hardness is pressed against the functional film surface with a constant load and a line is drawn. With a pencil hardness of 5H, a pencil with a hardness of 5H will not scratch,
This indicates that a pencil having a hardness of 6H is scratched. The eraser test is based on the number of times the film surface is scratched when a plastic or eraser with a certain elasticity and coefficient of friction is pressed against the functional film surface with a constant load and repeatedly rubbed. It evaluates sex. The eraser test 50 times means that the film surface is not damaged up to 50 times even if it is rubbed with a predetermined plastic / eraser.

FIG. 1 shows the evaluation results of the film strength of various functional films provided on the outer surface of the face plate (4) of the color cathode ray tube. In the figures, the film strengths of the various conventional functions described above are shown.

Shows an antistatic functional film (1) obtained by dispersing and mixing conductive filler particles (17) in a porous silica (SiO ₂ ) film (19) as shown in FIG. The film strength was 9H-70 times. Since there is no harder pencil for 9H, there may be a difference in actual hardness even with the same 9H. However, if the pencil hardness is 9H or more, there is no problem under the actual use condition of the color cathode ray tube. It does not happen.

The porous silica (SiO ₂ ) -based film (19) as shown in FIG. 8 contains conductive filler particles (17) and inorganic or organic pigment or dye particles (1).
The film strength of the antistatic / light selective absorption type functional film (1) in which 8) is dispersed and mixed is 8H-50 times, and inorganic or organic pigment or dye particles (18) are added thereto. As a result, the film strength becomes weaker.

The conductive filler particles (17) and the inorganic or organic pigment or dye particles (1) are contained in a porous silica (SiO ₂ ) based film (19) as shown in FIG.
8) In addition to ultrafine magnesium fluoride (MgF ₂ )
The film strength of the optical single-layer type antistatic / light selective absorption / low reflection type functional film (1) in which (20) is dispersed and mixed is indicated by 5H−
It is 20 times and shows a considerable decrease. This is in addition to the above, ultra-fine magnesium fluoride (MgF ₂ ) (20)
This is because the film strength is further reduced by the amount of the addition.

The porous silica (SiO ₂ ) -based film (19) as shown in FIG. 10 contains conductive filler particles (17) and inorganic or organic pigment or dye particles (1).
In addition to 8), a high-refractive-index layer (22) formed by dispersing and mixing an ultrafine particle high-refractive material ( 11 ) for increasing the refractive index to a constant thickness , and a porous silica (SiO ₂ ) -based In addition to the conductive filler particles (17) and the inorganic or organic pigment or dye particles (18) in the film (19), ultrafine particles of magnesium fluoride (MgF ₂ ) (20) are dispersed and mixed to obtain a uniform film thickness. It shows the film strength of the optical multilayer antistatic / light selective absorption / low reflection type functional film (1) composed of a combination of two layers with the low refractive index layer (21) formed as a film. Down to 3H-10 times. In addition to the above, this is because the photorefractive index layer (22) is increased and the overall film thickness is increased, which is disadvantageous in terms of film strength, and the high refractive index layer (22) itself is a porous silica (SiO ₂ ) based film. This is due to the fact that the film strength is weak because various different materials are added to (19).

[0038]

As described above, in the conventional color cathode ray tube, the functional film provided on the outer surface of the face plate portion 4 is provided with functions such as antistatic, light selective absorption, and low reflection. The more they are added, the more kinds and amounts of different materials added to the porous silica (SiO ₂ ) based film (19) as a base, and as a result, the film strength of the functional film (1) increases. When the color television receiver is in use, the functional film (1) provided on the outer surface of the face plate portion (4) of the color cathode ray tube is damaged during use.
The functional film (1) peels off, not only deteriorating the appearance but also affecting the image quality.

The present invention has been made to solve the above-mentioned problems, and is intended for use in providing a functional film having various functions including a light selective absorption function on a face plate portion of a color cathode ray tube. reduction issues the film strength of the resulting Ru feature film, was without Danwa reducing the membrane function, color
During use of the television receiver, the functional film provided on the outer surface of the face plate of the color cathode ray tube may be damaged, the functional film may be peeled off, the appearance may be impaired, or the image quality may be affected. It is an object of the present invention to provide a color cathode ray tube which is unlikely to cause a problem such as a problem.

[0040]

According to the color cathode ray tube of the present invention, of the functions of the functional film provided on the outer surface of the face plate portion, the light selective absorption function is provided between the inner surface of the face plate portion and the inner surface of the face plate portion. between the formed on the inner surface three-color phosphor layers have a common optical characteristics for three-color phosphor layers, by
Inorganic or organic pigments or dye particles dispersed mixed to Nda
By providing the light-selective absorption layer formed by coating and forming the combined coating liquid is obtained by so Taseru lifting Te inner surface smell of the face plate portion.

A third aspect is characterized in that the average particle size of the inorganic or organic pigment or dye particles is 1.0 μm or less.

According to a fourth aspect of the present invention, the spectral transmittance of the light selective absorption layer has two or more absorption peaks.

A fifth aspect of the present invention is that a silica (SiO ₂ ) -based transparent film or a silica (SiO ₂ )
₂ ) An antistatic film formed by dispersing and mixing conductive fine particles such as tin oxide (SnO ₂ ) and indium oxide (In ₂ O ₃ ) on a transparent film.

[0044] Claim 6 is characterized in that a optical monolayer type low-reflection film coated, deposited constant thickness by spin coating a low refractive index base paint on the face plate outer surface.

According to a seventh aspect of the present invention, a high-refractive-index base paint and a low-refractive-index base paint are alternately applied and formed to a constant thickness by spin coating on the outer surface of the face plate. It is characterized in that an optical multilayer type low reflection film is provided by a multilayer optical interference film.

The eighth aspect is characterized in that conductive particles such as tin oxide (SnO ₂ ) and indium oxide (In ₂ O ₃ ) are mixed in the low reflection film.

[0047]

[Function] Of the various functions conventionally provided on the functional film provided on the outer surface of the face plate portion, the antistatic function and the low reflection function can exhibit their functions only in their specific locations due to their characteristics. Although it is difficult to move, it is not always necessary to stick to the outer surface of the face plate part for the light selective absorption function, and a light selective absorption layer with equivalent optical characteristics is attached to the inner surface of the face plate part and its inner surface. By providing it between the formed three-color phosphor layer and the outer surface of the face plate portion, it is possible to obtain the same optical effect as that provided on the outer surface of the face plate portion.

The inorganic or organic pigment or dye particles used in the light selective absorption layer provided on the inner surface of the face plate portion may be a heat treatment at 400 ° C. to 450 ° C. which is performed during the manufacturing process of a color cathode ray tube. In addition to stability with respect to temperature, stability with respect to electron beams and X-rays received during operation of the color cathode ray tube is required. Such inorganic or
Mechanical pigment or dye particles were dispersed and mixed in a binder
The coating liquid is applied and formed into a film by spin coating, and the light selective absorption layer is formed.
To form

According to the present invention, among the functions of the functional film provided on the outer surface of the face plate portion of the color cathode ray tube, the light selective absorption function is provided by the inner surface of the face plate portion and the three-color fluorescent light formed on the inner surface. By providing the light selective absorption layer provided between the body layer and the body layer, it becomes possible to reduce the types and amounts of different kinds of materials added to the functional film provided on the outer surface. The problem of the decrease in the film strength of the functional film that occurs when a functional film having various functions is provided in the unit can be alleviated without deteriorating the film function, and the color cathode ray tube can be used while the color television receiver is in use. It is possible to prevent the functional film provided on the outer surface of the face plate portion from being damaged or from being peeled off.

[0050]

Embodiment 1 An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an enlarged conceptual sectional view of a phosphor screen according to the present invention having the same function as a conventional antistatic / light selective absorption type functional film. The outer surface of the face plate portion (4) has an antistatic treatment type functional film (1) in which conductive filler particles (17) are dispersed and mixed in a porous silica (SiO ₂ ) -based film (19). ) Is formed. On the other hand, on the inner surface of the face plate portion (4), a black light absorption layer (14), a BGR three-color phosphor layer (15), a metal back layer (16), and the like are provided in the same manner as the conventional phosphor screen. In the case of the present invention, between the inner surface of the face plate portion (4) and the BGR three-color phosphor layer (15) provided on the inner surface, optical characteristics common to these BGR three-color phosphor layers (15) are provided. This is different from the prior art in that a light selective absorption layer (2) having the following is provided.

The light selective absorption layer (2) has one main absorption peak and two sub absorption peaks similar to those shown in the spectral transmittance distribution of FIG. , One having one main absorption peak and one sub-absorption peak similar to that shown in the spectral transmittance distribution of FIG. 12 (II), and the like.
The selection is made in consideration of the light emission characteristics of 5).

As a method for forming the light selective absorption layer (2), a black light absorption layer (14) is formed on the inner surface of the face plate portion (4) by the same photoengraving method as before, and then formed thereon. This is carried out by applying and forming a coating liquid in which inorganic or organic pigment or dye particles (18) are dispersed and mixed in a binder. As a binder,
For example, an aqueous solution of polyvinyl alcohol (PVA) is used
It is possible. It has been experimentally confirmed that the thickness of the light selective absorption layer (2) is required to be 0.1 μm or more from the viewpoint of improving the contrast. When the thickness is smaller than 0.1 μm, the effect of improving the contrast is significantly reduced. It is considered that this is because when the thickness is reduced, the absorbing effect on external light is changed from volumetric absorption to planar absorption.

In order to obtain the desired optical characteristics as described above, it is difficult to use only one kind of inorganic or organic pigment or dye particles (18) to be added to the binder. Is done. In order to form the light selective absorption layer (2) composed of a uniform film, the average particle diameter of the inorganic or organic pigment or dye particles (18) added to the binder is desirably 1.0 μm or less. .

After the light selective absorption layer (2) is formed on the inner surface of the face plate portion (4) in this way, the BGR three-color phosphor layer (15) is formed on the light selective absorption layer 2 by a method similar to the conventional method. And a metal back layer (16). Therefore, the light selective absorption layer (2) acts as a common characteristic to the light emission of the BGR three-color phosphor layer (15) as an optical characteristic.

FIG. 1 shows the strength of the functional film on the outer surface of the face plate portion (4) in the case of the present invention according to Example 1, which was 9H-70 times. The function of the entire phosphor screen in this case is equivalent to that of the conventional antistatic / light selective absorption type functional film (1).
Film strength 8H-50 of functional film on outer surface of plate (4)
Significant improvements have been made over time.

Embodiment 2 FIG. 3 is an enlarged conceptual sectional view of a phosphor screen according to the present invention having the same function as a conventional optical single-layer type antistatic / light selective absorption / low reflection type functional film. Face plate part (4)
Has a porous silica (SiO ₂ ) -based film (1
In 9), conductive filler particles (17) for imparting an antistatic function and ultrafine magnesium fluoride (MgF ₂ ) for lowering the refractive index of the film, (20) are dispersed and mixed, and the mixture is fixed. Low refractive index layer (2)
1) is provided. This low refractive index layer (21) functions as an antistatic / low reflection type functional film (1). On the other hand, like the first embodiment, the inner surface of the face plate portion (4) is located between the inner surface of the face plate portion (4) and the BGR three-color phosphor (15) provided on the inner surface. A light selective absorption layer (2) having optical characteristics common to the BGR three-color phosphor layer (15) is provided.

[0057] The optical characteristics of the light selective absorption layer (2), the shape formed <br/> method such is exactly the same as in Example 1. In the case of the phosphor screen of Example 2 according to the present invention, the face plate portion (4) is provided with an antistatic function and an optical single-layer low reflection function, and an inner surface with a light selective absorption function. Comprehensively, a function equivalent to that of a conventional optical single-layer type antistatic / light selective absorption / low reflection type functional film is obtained.

FIG. 1 shows the film strength of the outer surface of the face plate portion (4) in the case of the present invention according to the second embodiment.
8H-50 times. The function of the entire phosphor screen in this case is equivalent to that of the conventional optical monolayer type antistatic / light selective absorption / low reflection type functional film (1), so that the face plate (4) in this case is used. A large improvement has been made for the film strength 5H-20 times of the functional film on the outer surface of the above ()).
From a practical point of view when using a color television receiver at home, a pencil hardness of 7H and an eraser test of 30 times or more can be said to cause almost no problem. It can be said that it has sufficient film strength.

Embodiment 3 FIG. 4 is an enlarged conceptual sectional view of a phosphor screen according to the present invention having the same function as a conventional optical multilayer type antistatic / light selective absorption / low reflection type functional film. Face plate part (4)
High refractive index layer (22) with constant refractive index and film thickness on the outer surface of
And a low refractive index layer (21). An optical multilayer antistatic / low reflection type functional film (1) comprising a combination of two layers is provided.

In this case, the high refractive index layer (22) is made of a porous silica (SiO ₂ ) -based film (19) and conductive filler particles (17) and ultrafine particles of a high refractive index material (17) for increasing the refractive index. 11) are dispersed and mixed to form a film having a constant film refractive index and film thickness. As the ultrafine particle high refraction material (11), titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂ O ₅ ), zirconium oxide (ZrO ₂ ), zinc sulfide (ZnS) having an average particle diameter of 1000 ° or less as in the prior art. ) Etc. are used. The low-refractive-index layer (21) is a low-refractive-index layer (2) constituting the antistatic / low-reflection type functional film (1) described in the second embodiment.
Since the configuration is the same as 1), the description is omitted.

On the other hand, on the inner surface of the face plate portion (4), as in the first and second embodiments, the inner surface of the face plate portion (4) and the BGR three-color phosphor layer ( 15), there is provided a light selective absorption layer (2) having optical characteristics common to these BGR three-color phosphor layers (15). The optical characteristics and forming method of the light selective absorption layer (2) are exactly the same as those in the first and second embodiments. In the case of the phosphor screen of the third embodiment according to the present invention, the outer surface of the face plate portion (4) has an antistatic function and an optical multilayer type low reflection function, and the inner surface has a light selective absorption function. Conventional optical multilayer antistatic
This is to obtain a function equivalent to that of a light selective absorption / low reflection type functional film. In the case of the optical multilayer low reflection film composed of a combination of both high and low refractive index layers, the lower the surface reflectance can be realized by increasing the number of layers as in the conventional case. In the case of coating and film formation by the method described above, it is difficult to control delicate control and unevenness of the film thickness, so that two to four layers can be said to be the limit of the number of layers.

FIG. 1 shows the film strength of the outer surface of the face plate portion (4) in the case of the present invention according to the third embodiment.
7H-40 times. The function of the entire phosphor screen in this case is equivalent to the optical multilayer antistatic / light selective absorption / low reflection type functional film (1) in the conventional case, so the face plate portion (4) in this case. a greatly improvements have been made to membranes <br/> strength 3H-10 times of the functional film of the outer surface.
As described above, in the case of a color television receiver used at home, it can be said that there is no problem if it is 7H-30 times or more practically. Therefore, the embodiment 3 has a practically sufficient film strength. It can be said that.

In Examples 1 to 3 above, as an antistatic function, an example is given in which the conductive filler particles (17) are dispersed and mixed in the porous silica (SiO ₂ ) film (19). However, the present invention is not limited to this, and the moisture contained in the porous silica (SiO ₂ ) -based film (19) and the moisture in the air can be removed without adding the conductive filler particles (17). The same applies to the case where conductivity is imparted by taking in the film.

[0064]

As described above, according to the present invention, of the various functions of the functional film provided on the outer surface of the face plate portion of the color cathode ray tube, the light selective absorption function is provided on the inner surface of the face plate portion and the inner surface thereof. By providing the light selective absorption layer provided between the formed three-color phosphor layer and the three-color phosphor layer, it is possible to reduce the kind and amount of different materials added to the functional film provided on the outer surface, and Able to mitigate the problem of the decrease in the film strength of the functional film that occurs when providing a functional film with various functions on the face plate of the cathode ray tube without deteriorating the film function, and using a color television receiver In addition, the functional film provided on the outer surface of the face plate of the color cathode ray tube may be damaged, the functional film may be peeled off, the appearance may be damaged, and the image quality may be affected. Ku It is possible to obtain a high-quality color cathode ray tube. In addition, this light selective absorption layer is provided in a later step.
There is an effect of improving the base when forming the three-color phosphor layer,
The adhesive strength of the color phosphor layer can be improved. this
Therefore, the quality of the three-color phosphor layer can be improved and the
The yield of the cathode ray tube can be improved. In addition, the inorganic pigment
When selected as the material for the selective absorption layer, this light selective absorption layer
Functions as a barrier to electron beams,
The electron beam that has passed through the optical layer is directly face plate glass
Can be prevented from being hit. For this reason, face press
Prevents burning (browning) of the glass by electron beam
it can. Further, according to the first aspect, the light selective absorption layer can be realized by inorganic or organic pigment or dye particles which can be formed by coating and film formation.

According to the second to eighth aspects, the above-described effects can be suitably realized. That is, according to the second aspect, by using a mixture of two or more kinds of inorganic or organic pigment or dye particles, adjustment can be performed so as to obtain desired optical characteristics. According to the third aspect, since the average particle diameter of the inorganic or organic pigment or dye particles is 1.0 μm or less, a light selective absorption layer that is a uniform film can be realized. According to claim 4, since the spectral transmittance having two or more absorption peaks, for example, a main absorption peak is consistent with the relatively high area of the human eye vision sensitivity, the body color of the sub absorption peak fluorescent screen As a means of adjustment, it can be suitably realized. According to claim 5,
By forming the antistatic layer, the discharge phenomenon in when a person approaches even when using a high voltage does not occur, write that malfunction is prevented. According to the sixth aspect, an optical single-layer low-reflection function is provided in addition to the light selective absorption function, so that a high-performance color cathode ray tube having both functions can be realized. According to the seventh aspect, since the optical multilayer type low reflection film is provided by the multilayer optical interference film having two or more layers and four or less layers, a lower reflectance can be realized. According to the eighth aspect, in the sixth or seventh aspect, a high-performance color cathode ray tube having an antistatic function can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing the strength of a functional film provided on the outer surface of a face plate.

FIG. 2 is an enlarged schematic sectional view of a phosphor screen according to the present invention having an antistatic function.

FIG. 3 is an enlarged conceptual sectional view of a phosphor screen according to the present invention having an optical single-layer low-reflection function.

FIG. 4 is an enlarged conceptual sectional view of a phosphor screen according to the present invention having an optical multilayer type low reflection function.

FIG. 5 is a view for explaining the principle of antistatic of a color cathode ray tube with an antistatic treatment type functional film.

FIG. 6 is an enlarged conceptual sectional view of a phosphor screen for explaining an antistatic treatment type functional film.

FIG. 7 is an enlarged conceptual sectional view of a phosphor screen for explaining another antistatic functional film.

FIG. 8 is an enlarged conceptual sectional view of a phosphor screen for explaining an antistatic / light selective absorption type functional film.

FIG. 9 is an enlarged conceptual sectional view of a phosphor screen showing a configuration example of an antistatic, light selective absorption, and low reflection type functional film.

FIG. 10 is an enlarged conceptual sectional view of a phosphor screen showing another configuration example of the antistatic, light selective absorption, and low reflection type functional film.

FIG. 11 is a view showing optical characteristics of an antistatic / light selective absorption type functional film.

FIG. 12 is a diagram showing another optical characteristic of an antistatic / light selective absorption type functional film.

FIG. 13 is a view showing the surface spectral reflectance of a functional film and a face plate.

[Explanation of symbols]

(1) Functional film (2) Light selective absorption layer (3) Antistatic treatment type color cathode ray tube with functional film (4) Face plate part (5) High voltage button (6) Neck part (7) Deflection yoke (8) Metallic explosion-proof band (9) Mounting ear (10) Ground wire (11) Ultra-fine particle high refractive material (12) Conductive tape (13) Funnel part (14) Black light absorbing layer (15) BGR three-color phosphor layer ( 16) Metal back layer (17) Conductive filler particles (18) Inorganic or organic pigment or dye particles (19) Porous silica (SiO ₂ ) -based film (20) Ultrafine magnesium fluoride (MgF ₂₎ (21) Low refractive index layer (22) High refractive index layer

Claims (8)

(57) [Claims] 1. A color cathode ray tube having a face plate
A functional film formed on the outer surface and the face plate
A three-color phosphor layer provided on the inner surface of the face plate ; and a three- color phosphor layer provided between the inner surface of the face plate and the three- color phosphor layer.
Having common optical properties for the color phosphor layer ,
A pigment or dye particles of inorganic or organic dispersed mixed
Light selective absorption layer with a color cathode ray tube characterized by comprising a light selective absorption layer formed by coating and forming a coating liquid. 2. The color cathode ray tube with a light selective absorption layer according to claim 1, wherein the light selective absorption layer is constituted by dispersing and mixing two or more kinds of inorganic or organic pigment or dye particles. 3. The inorganic or organic pigment or the average particle size according to claim 1 or 2 light-selective absorption layer with a color cathode ray tube wherein a is 1.0μm or less of dye particles of. 4. The light selective absorption layer according to claim 1, wherein the spectral transmittance of the light selective absorption layer has two or more absorption peaks .
A color cathode ray tube with a photoselective absorption layer according to any one of claims. 5. A face plate formed on an outer surface .
Functional film, silica (SiO ₂₎ based transparent film or a silica tin oxide transparent film (SiO ₂₎ system (SnO _2), indium oxide (In ₂ O ₃₎ charging the conductive fine particles were dispersed and mixed in such The color cathode ray tube with a light selective absorption layer according to any one of claims 1 to 4, wherein the color cathode ray tube is a prevention film. 6. formed on face plate outer surface
Functional film, any one of claims 1 to 4, characterized in that <br/> a low refractive index base coating is optically monolayer type low-reflection film coated, deposited constant thickness by spin coating light selective absorption layer with a color cathode ray tube according to. 7. formed in face plate outer surface
For the functional film, a high-refractive index base paint and a low-refractive index base paint are alternately applied and formed into a film with a constant film thickness by a spin coating method. of claims 1 to 4, characterized in that a reflective film
A color cathode ray tube with a light selective absorption layer according to any one of the above. 8. tin oxide in the low-reflection film (SnO ₂₎ and indium oxide (In ₂ O ₃₎ according to claim 6 or 7 photoselective with absorbing layer, wherein the mixed conductive particles, such as Color cathode ray tube.