JP2003197135A - Image display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve a filled density of a fluorescent screen, and improve service life characteristics and brightness characteristics of an image display device. <P>SOLUTION: This image display device comprises a field emission type display device provided with a face plate on which the fluorescent screen is formed, and a means to radiate an electron beam to the fluorescent screen. The fluorescent screen is composed of main phosphor mixed with particulate phosphor of an average grain size, smaller than 1/2 that of the main phosphor. Since the particulate phosphor is mixed, the filled density of the fluorescent screen is improved, thereby both characteristics of service life and brightness are improved. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a field emission type display device and a projection type cathode ray tube equipped with a face plate having a fluorescent film formed thereon and means for irradiating the fluorescent film with an electron beam. The present invention relates to a field emission type display device (hereinafter referred to as FED) and a projection type cathode ray tube, characterized in that a fine particle phosphor is mixed as a constituent phosphor.

[0002]

2. Description of the Related Art In video information systems, various display devices have been actively researched and developed in response to various demands such as high definition, large screen, thinning, and low power consumption. Until now, display devices mainly using cathode ray tubes have been widely used, but there is a limit to thinning them. In recent years, FED has been actively researched and developed as a display that realizes thinness and low power consumption to meet such requirements. The FED has a structure in which a flat field emission electron source is installed on the back surface of the vacuum envelope and a fluorescent film is installed on the inner surface of the face plate on the front surface. Low-acceleration electron with an acceleration voltage of about 0.1 to 10 kV. An image is displayed by irradiating the fluorescent film with a line to emit light. Here, the current density of the electron beam with which the fluorescent film is irradiated is about 10 to 1 of a general cathode ray tube.
Since the current density is as high as about 000 times, it is desirable that the FED phosphor film has a low resistance characteristic that does not cause charge-up. In addition, good life characteristics under high current density, high brightness characteristics with less brightness saturation are also required. In addition, since the fluorescent film is irradiated with an electron beam having a high current density, the electron beam reaches the inner surface of the face plate through the fluorescent film, causing a glass burn and discoloring to brown, thereby reducing the brightness life of the display. There's a problem.
In addition, glass burning is one of the factors that reduce the brightness life of a projection type cathode ray tube in which a fluorescent film is irradiated with an electron beam having a current density of about 100 times that of a general cathode ray tube.
The improvement is an issue. Until now, various developments have been made to realize low resistance, long life, and high brightness of the fluorescent film. As a method for improving the performance of the FED phosphor film by mixing the phosphors, for example, Japanese Patent Application Laid-Open No. Hei 09
As disclosed in Japanese Patent No. 87618, there is a method in which a phosphor having a high resistance and a phosphor having a low resistance are mixed to have excellent luminance characteristics at a driving voltage of 2 kV or less. Also, for example, Japanese Patent Laid-Open No.
As disclosed in Japanese Patent Publication No. 96046, a method comprising a mixed phosphor of a sulfide-based phosphor and an yttrium-aluminate-based or silicate-based oxide-based phosphor, and having a good emission luminance maintenance rate over time. There is. On the other hand, as a method of mixing phosphors of different particle sizes, which is not for FED use, for example, as disclosed in Japanese Patent Laid-Open No. 07245062, small blue phosphors are inserted into a gap between large blue phosphors in a plasma display device. There is a method of suppressing unnecessary discharge due to the exposure of the address electrode by using a phosphor layer having a dense structure. Until now, various methods have been studied to realize low resistance, long life, and high brightness of the FED fluorescent film. However, all of these problems have not been solved by these conventional methods. In particular, there is a need for a new method that not only reduces the resistance of the individual phosphors but also the resistance of the entire phosphor film, achieves a long life and high brightness of the phosphor film, and further reduces glass burn.

[0003]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to reduce the resistance, the life and the brightness of the conventional phosphor film described above, and to further reduce the glass burn. Another object of the present invention is to provide a field emission display device and a projection type cathode ray tube having the above characteristics.

[0004]

An object of the present invention is to provide an image display device provided with a face plate having a fluorescent film formed thereon and a means for irradiating the fluorescent film with an electron beam, wherein the fluorescent film mainly comprises the fluorescent film. And a fine particle phosphor having an average particle size smaller than 1/2 of that of the main phosphor. That is, one of the characteristics of the fluorescent film used in the image display device of the present invention is that by mixing the main fluorescent material with the fine particle fluorescent material, the fine particle fluorescent material enters into the gap between the main fluorescent material and the contact between the fluorescent materials occurs. And the resistance of the entire fluorescent film is reduced. In addition, the average particle size B of the fine particle phosphors to be mixed is 0.16A ≦ B ≦ 0.2 with respect to the main phosphor of the average particle size A.
In the case of being represented by 8A, since the fine particle phosphor just enters the gap between the main phosphors, the packing density of the phosphor film is improved. In addition, 2 to 5 particles of phosphor are used for the main phosphor.
When 0% by weight is mixed, the fine particle phosphor enters the gap between the main phosphors, and the packing density of the phosphor film is improved. Further, when the main fluorescent material having the average particle diameter A and the fine particle fluorescent material having the average particle diameter B are mixed and the volume at the position of the particle diameter B is larger than the normal distribution curve by 2 to 50% by volume, the fine particle fluorescent light is emitted. The body enters the gaps between the main phosphors and the packing density of the phosphor film is improved. Further, when the volume at the position of the particle size B is larger than the normal distribution curve by 6 to 12% by volume, the packing density of the fluorescent film is particularly improved. Further, by making the composition of the main fluorescent material and the fine particle fluorescent material the same, it is possible to realize a low resistance of the fluorescent film without changing the emission characteristics of the fluorescent material. The main phosphor is ZnS: Ag phosphor, which is a sulfide phosphor, and the phosphor to be mixed is an oxide phosphor, Y ₂ SiO ₅ : Ce, (Y, Gd) ₂ SiO ₅ : Ce. ,
ZnGa ₂ O ₄ , CaMgSi ₂ O ₆ : Eu, Sr ₃ MgSi ₂ O ₈ : Eu, Sr ₅ (PO ₄ ) ₃ C
By using any one or more of l: Eu, YNbO ₄ : Bi phosphors, it is possible to reduce the scattering of sulfur, reduce the resistance of the phosphor film, and improve the life and brightness characteristics. It is possible to improve and realize a good blue fluorescent film for FED. The main phosphor is Y ₂ O ₂ S: Eu phosphor, which is a sulfide-based phosphor, and the mixed phosphor is Y ₂ O ₃ : Eu, S, which is an oxide-based phosphor.
By using one or more of the rTiO ₃ : Pr, SnO ₂ : Eu, and SrIn ₂ O ₄ : Pr phosphors, it is possible to reduce the scattering of sulfur and reduce the resistance of the phosphor film. ,lifespan,
The brightness characteristics are improved, and a good red phosphor film for FED can be realized. In addition, the main phosphor is Y ₂ which is an oxide-based phosphor.
SiO ₅ : Tb, (Y, Gd) ₂ SiO ₅ : Tb, Y ₃ (Al, Ga) ₅ O ₁₂ : Tb, (Y, Gd) ₃
(Al, Ga) ₅ O ₁₂ : Tb, ZnGa ₂ O ₄ : Mn, Zn (Ga, Al) ₂ O ₄ : Mn, ZnO: Z
ZnS: Cu, which is one or more of the n phosphors and the phosphor to be mixed is a sulfide-based phosphor,
By using one or more of ZnS: Cu, Au phosphors, the contact between the phosphors is increased and the resistance of the phosphor film is lowered, thus improving the life and brightness characteristics. In addition, a good green fluorescent film for FED can be realized. The main phosphor is Y ₂ O ₃ : Eu, SrT, which is an oxide phosphor.
Y ₂ O ₂ which is one or more of iO ₃ : Pr phosphors and the phosphor to be mixed is a sulfide-based phosphor
By using the S: Eu phosphor, the resistance of the phosphor film is lowered by increasing the contact between the phosphors, the lifetime and brightness characteristics are improved, and a good red phosphor film for FED can be realized. Further, the above-mentioned object is a projection type CRT equipped with a face plate having a fluorescent film formed thereon and means for irradiating the fluorescent film with an electron beam, wherein the average particle size of the fluorescent film is mainly with respect to the main fluorescent substance. This is achieved by a projection type cathode ray tube equipped with a fluorescent film, characterized in that a small particle phosphor smaller than the main phosphor is mixed in a range of 5% by weight or more and 70% by weight or less. That is, one of the characteristics of the fluorescent film used in the image display device of the present invention is that by mixing the main fluorescent substance with the small particle fluorescent substance, the small particle fluorescent substance enters into the gap between the main fluorescent substances and The packing density is improved. In addition, the small particle phosphors enter the gaps between the main phosphors, the contact between the phosphors increases, and the resistance of the entire phosphor film is reduced. In addition, a small particle phosphor having an average particle size smaller than that of the main fluorescent substance is used in an amount of 10% by weight or more and 40% or less.
The packing density of the fluorescent film is particularly improved by the fluorescent film characterized by being mixed in the range of not more than wt%. With the fluorescent film having such characteristics, it is possible to provide an image display device having a good brightness life by improving the glass burning due to the transmission electron beam irradiation on the inner surface of the face plate in the projection type cathode ray tube and the field emission type display device.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION Here, in the image display device of the present invention,
For each method such as the manufacturing method of the phosphor to be used and the brightness characteristics,
The embodiment described below embodies the present invention.
FIG. 1 shows an example of the present invention, which binds the present invention.
There is no. (Embodiment 1) FIG. 1 is a schematic view showing an example of a fluorescent film of the present invention.
It is a figure. In FIG. 1, 2 is a face plate and 3 is
The whole phosphor film, 4 is the main phosphor, 5 is the mixed fine particles
It is a light body. The optimum phosphor layer thickness is about 3 layers,
In the phosphor film of the present invention, the fine particle phosphor is provided in the gap between the phosphor layers.
It has a complicated structure. The electron beam received by the fluorescent film 3
The electrons generated by the dome 6 are generated by the mixed fine particle phosphor 5.
Since the contact between each phosphor is increasing,
It spreads over the entire light screen 3, and as a result, the low resistance of the entire fluorescent film 3 is reduced.
Anti-resistance is planned. Furthermore, the fine particle phosphor is mixed
The density of the fluorescent film is increased by the amount of
The product is increasing. Therefore, an electron beam with the same current amount is fluorescent.
The current density on the phosphor surface when the film is irradiated is determined by the present invention.
Will be lower than before. If the current density becomes low,
The deterioration of the light film over time is reduced and the life characteristics are improved. Well
Moreover, when the current density is low, the brightness decrease due to the brightness saturation is suppressed.
And the emission brightness from the entire phosphor screen is improved.
It Sulfide-based phosphor is used for the structure around the fluorescent film
Aluminum back prevents sulfur from scattering
Therefore, the deterioration of the electron source can be suppressed. Also,
By providing the ITO film on the fluorescent film side of the spacer plate 2,
As a result, the resistance of the fluorescent film can be reduced. Receiving phosphor film 3
The electron beam 6 that is emitted has an accelerating voltage in a field emission display.
It has a low acceleration voltage of about 0.1 kV to 10 kV.
The flow rate is about 10 to 1000 times higher than that of general cathode ray tubes.
Yes. Also, the current of the irradiation electron beam in the projection type cathode ray tube
The amount is about 100 times higher than that of general cathode ray tubes. That
Therefore, it reaches the face plate 2 through the fluorescent film.
The electron dose is relatively large, and the inner surface of the face plate 2 is electrically charged.
The sacrificial wire causes a glass burn that turns brown. Moth
When lath burn occurs, the light emitted by the phosphor is
The intensity of the light that passes through the window 2 and appears in front of the display.
The degree decreases. Glass burn is the brightness life of the display
Is one of the causes of decrease. Such a display
To reduce the glass burn that causes the deterioration of the brightness life of
Enhances the packing density of the phosphor film and reduces the gaps between the phosphors.
However, it is effective to reduce the transmitted electron dose. Book
The fluorescent film mixed with the small particle phosphor of the present invention enables
The packing density is improved, the transmitted electron dose is reduced, and
Injury can be reduced. (Embodiment 2) FIG. 2 is a schematic view showing a part of the above-mentioned fluorescent film 3.
It is a figure. In FIG. 2, on top of the three main phosphors 4,
The fine particle phosphor 5 is mounted. Where the main phosphor
Radius R, radius of fine particle phosphor r, inside fine particle phosphor
Line drawn from the heart perpendicular to the plane passing through the center of the main phosphor
Let y be the length of y = (r^Two+ 2rR-1 / 3R^Two)^1/2 It is represented by. When y = 0, that is, three main phosphors
The radius of the fine particle phosphor when entering the gap is r = 0.16R
is there. In addition, one more on top of the above three main phosphors
Fine particle fluorescence in the gap created when one main phosphor is placed
When the body enters and contacts all four main phosphors
The center of the fine particle phosphor is made by the centers of the four main phosphors.
Since it is the center of gravity of the tetrahedron, y = (8/27) R,
r = 0.28R. Therefore, the average particle size of the main phosphor is
Let A be the average particle size of the fine particle phosphors to be mixed, and let B be the main
Enter the gap between the phosphors and the fine particle phosphors come into contact with each phosphor.
What is done is 0.16A ≦ B ≦ 0.28A. At this time,
If the composition of the particle phosphor is the same as that of the main phosphor
For example, the mixing weight of the fine particle phosphor is 2% by weight to 9% by weight.
The range of is desirable. Also, at this time, due to the fine particle phosphor
The increase in the surface area of the phosphor is 10 to 31%. Fine particles
If the average particle size B of the phosphor is B = 0.28A, fine particle fluorescence
9% by weight of body mixing, 31% increase in surface area
is there. Therefore, the average particle size B of the fine particle phosphor is B = 0.28A
In this case, the current density is reduced by 24%. B = 0.28 in FIG.
Brightness maintenance of blue ZnS: Ag phosphor by A accelerated test
Indicates the rate. The current density of the irradiated electron beam is 450 μA / c
m²The substrate temperature is 200 ° C. The conventional fluorescent film does not
When the sagittal beam is irradiated, the brightness drops sharply and
It reduces to about 80% in total. Meanwhile, the fluorescent film according to the present invention
In the case of using, the resistance of the entire fluorescent film is lowered.
As the current density is reduced,
The brightness maintenance rate is maintained at about 90%. In this way,
By using a bright fluorescent film, the brightness retention rate is
Approximately 10% improvement. In addition, Fig. 4 shows the ZnS: Ag phosphor
Shows a graph of the log-log plot of emission brightness and current density.
You Current density range is about 45μA / cm in low current density range²，
About 110μA / cm at high current density²And Underlined graph
It is the graph which shows the conventional luminous brightness current density, on the graph
A line is a graph showing the emission luminance current density of the present invention. Up
As mentioned above, the current density at B = 0.28A is 24%.
Reduced, about 35μA / cm at low current density²、 About high current range
85 μA / cm²Becomes Log-log plot for ZnS: Ag
The slope of is from about 0.7 as the current density increases.
The light emission efficiency is reduced to about 0.6. Therefore,
The lower the flow density, the higher the luminous efficiency. Current density according to the invention
Since it is possible to use the region where the light emission efficiency is low and the luminous efficiency is high,
As shown in 4, the emission brightness is improved by about 10% in the low current range,
Approximately 20% improvement in high current range. (Embodiment 3) FIG. 5 shows the average particles of the fine particle phosphor 5 to be mixed.
The diameter B is larger than the gap of the main phosphor 4, B> 0.28A
It is a schematic diagram in the case of. At this time, the thickness T of the fluorescent film is T =
It is represented by 4R + 2y. Fig. 6 shows the average particle size of the main phosphors.
With a change in the average particle size of the fine particle phosphor when the thickness is 4 μm
The graph of thickness change is shown. The average particle size of the fine particle phosphor is 1.1
Because up to about μm, the fine particle phosphor enters the gap
The film thickness is about the same as 10.5 μm. On the other hand, B> 1.
At 1 μm, the film thickness tends to increase as shown in FIG.
It Fine particles with the same phosphor composition and B = 1.1 μm
The optimum weight of the child phosphor is 9% by weight. Phosphor average
The optimum film thickness when the particle size is 4 μm is due to the demand for brightness characteristics.
10 to 12 μm is desirable, and the film thickness is thinner than that
And the light emitting layer is not sufficient and the brightness is low, and conversely it is thicker
When the phosphor surface absorbs light, the emission brightness decreases. Figure 6
The average particle size of the fine particle phosphors to be mixed as shown in
If it is smaller than 2.0 μm, which is 1/2 of the phosphor, the film thickness
Is smaller than 12 μm, which is good. At this time, the mixture of phosphors
The combined weight should be less than 50% by weight.
The photo film density is more preferably 6% by weight to 12% by weight. Figure 7
Is a graph showing the particle size distribution of the phosphor, where the vertical axis is the volume ratio
The abscissa and the horizontal axis are expressed by the particle size of the phosphor. Average particle size is 4μ
m as the main phosphor and a fine particle phosphor with an average particle size of 1 μm
When mixed at 10% by weight, as a whole, as shown in FIG.
Has a particle size distribution that is biased toward the small particle side, and the fine particle phosphor is mixed.
Normal distribution formed by the main phosphor by the combined amount
It is out of alignment. The composition of the main phosphor and the fine particle phosphor is
If they are the same, this deviation is mixed
Volume ratio at the position of particle size B, which is almost equal to the weight ratio of
The deviation from the normal distribution of is in the range of 2% by volume to 50% by volume.
Is good, especially in the range of 6% to 12% by volume.
More desirable. Fig. 8 shows Y with a particle size of 6 μm and 4 μm.₂SiO_Five: T
b Phosphor and Y with particle size 6μm and 4μm₂SiO_Five: Tb phosphor
It is a graph which shows the particle size distribution of the mixed fluorescent substance. In Figure 8
In addition, the main phosphor with a particle size of 6 μm has a small particle size of 4 μm.
20% by weight of the child phosphor is mixed. So with the whole
As a result, the particle size distribution is biased toward the small particle side, and
Particle size formed by the main phosphor by the amount that is mixed
The particle size distribution deviates from 6 μm. Fig. 9 shows the dense packing of the fluorescent film.
The average particle size dependence of the fine particle phosphor is shown. Fine particle fluorescence
The average particle size B of the body is preferably 0.8 to 1.4 μm,
Therefore, the composition of the main phosphor and the fine particle phosphor are the same.
In this case, the fluorescent film density is more preferably 6% by weight to 12% by weight.
Good (Embodiment 4) Here, as a principle experiment, on a glass substrate
A mixed fluorescent film is formed on the film, and its film thickness, film density, and light transmittance
Was investigated. Green emission Y with an average particle size of 8 μm₂SiO_Five: Tb
Phosphor and green emission Y with average particle size 4μm₂SiO_Five: Tb phosphor mixed
Then, the fluorescent film is formed on the glass substrate by the sedimentation coating method.
It was In the settling application performed this time, a settling tube with a diameter of 65 mm was
Add 135 ml of pure water and add 1.30 g of anhydrous barium acetate.
Add 14 ml of the solution prepared by adding 150 ml of pure water,
14 ml of surfactant was added. So that the desired film thickness is obtained
Add the weighed mixed phosphor to 50 ml of pure water.
40m water glass (Oka Seal A, Tokyo Ohka Kogyo)
27 ml of the solution prepared by adding 1 to 198 ml of pure water.
Then, the solution and the substrate were placed in a settling tube. Paint
The liquid level height from the glass substrate when clothed is about 5 cm. Sinking
The falling time was 7 minutes, and after coating, the solution was shaken from the bottom of the settling tube.
After gently pulling it out, dry the coated substrate at room temperature.
It was Thus, the mixed fluorescent film was formed. Before and after application
Calculate the film weight of the fluorescent film applied from the weight of the glass substrate
It was Also, the film thickness is measured by laser focus displacement meter (LT-8
010, KEYENCE). The film density is the film weight,
It was determined from the film thickness and the substrate area. Film of the thickness of the applied fluorescent film
The change in weight is shown in FIG. In case of single fluorescent film with 8μm particle size
The thickness of the film increases linearly with the increase of the film weight. Particle size
Add 30% by weight of phosphor with particle diameter 4μm to phosphor with 8μm
The change in film thickness and film weight of the mixed fluorescent film mixed by
I showed it. Mixed fluorescent film is thinner at the same film weight
Is getting worse. Especially, the film weight is 4 mg / cm^TwoCross over
And the film thickness of the mixed fluorescent film is significantly reduced. In Figure 11
The change in film weight of film density is shown. Film density for single fluorescent film
Is about 1.7 g / cm regardless of film weight^ThreeIs almost constant at
It With the mixed fluorescent film, the film density increases as the film weight increases.
Tends to increase. Compare single fluorescent film and mixed fluorescent film
Then, the film density of the mixed fluorescent film is higher and the film weight is larger.
The difference is so large. Next, a spectrophotometer (U3200,
The light transmittance of each fluorescent film was measured by Hitachi. Teru
The wavelength of the emitted light is 540 nm and the light is emitted from the fluorescent film side.
Measure the amount of light that has passed through the fluorescent film and the substrate glass by irradiation.
It was Only the glass substrate is installed as a reference, and the fluorescence
The light transmittance of the film was measured. Fig. 12 shows a single fluorescence with a particle size of 8 μm.
In the case of a film and a phosphor having a particle size of 8 μm and a phosphor having a particle size of 4 μm
The change in light transmittance of the mixed fluorescent film mixed with 0% by weight is shown.
You In both cases, the transmittance decreases as the film thickness increases. same
At the same thickness, the mixed fluorescent film has a light transmittance of about 10% lower.
Is getting worse. 8μm particle size phosphor and 8μm particle size fluorescent
Mixed fluorescence in which 30% by weight of phosphor having a particle size of 4 μm is mixed with the body
The film thickness, film density, and light transmittance of the films were compared. Mixed firefly
It is clear that the optical film has a small film thickness and a high film density
became. In addition, the light transmittance is about 10% with the mixed fluorescent film.
Fell to. These results are described in (Embodiment 1).
The mixed small particle phosphor into the main phosphor gap.
It shows that the porosity has decreased. (Embodiment 5) Green light emission Y having an average particle size of 8 μm₂SiO_Five: Tb firefly
Luminous body and green emission Y with average particle size 4μm₂SiO_Five: Tb phosphor mixed
Then, the fluorescent film is formed on the glass substrate by the sedimentation coating method.
It was The method for forming the fluorescent film is the same as in (Embodiment 4).
Fig. 13 shows the change in the light transmittance of the phosphor film in the 4 µm mixing ratio.
You 4 μm as a whole due to low transmittance of particle size 4 μm
The transmittance tends to decrease as the mixing ratio increases.
It From this, the single fluorescent film with small particle phosphors
Since it can be considered as one of the candidates for realizing the high density fluorescent film,
However, in the case of small particle phosphors, the brightness and life characteristics are poor.
In some cases, it may be inferior to a phosphor with a larger particle shape.
It Here, if the mixing ratio of small particle phosphors is low,
It will be described that the density of the optical film can be increased. FIG.
Therefore, if the mixing ratio of small particles is 5% by weight or more and 70% by weight or less
More than linear drop-down curve of transmission in range
There is a range where the transmittance is reduced. Particle size 8μm Single fluorescence
The transmittance of the membrane is 62%, while the transmittance of the mixed membrane is
When the mixing ratio of 4 μm is 10% by weight, it is 54%, which is about 8% lower.
It The transmittance is 4 μm and the mixing ratio is 5% by weight or more and 70% by weight.
The effect is low when the mixing ratio is relatively low in the range below.
You can see the fruit. Particularly, the mixing ratio of 4 μm is 10% by weight or more.
The transmittance is low in the range of 40% by weight or less, and small particles are mixed.
The effect of stopping light is great. As a result
Therefore, even when the mixed fluorescent film is irradiated with electron beams,
Stopping effect on the inside of the face plate
It is possible to reduce the glass burn on the surface. Next, 2 components
Particle mixture packed bed porosity estimation program (Michitaka Suzuki)
Then, the porosity, which is the ratio of the voids of the particles, was calculated. Figure
14 has a particle size of 8 μm, particles having a porosity of 50% and a particle size of 4 μm,
Small particle mixing of porosity when mixing particles with porosity of 50%
The change in ratio is shown. Empty by mixing two particles
It can be seen that the space ratio is less than the space ratio 50% of both.
It When the mixing ratio of small particles is 41% by weight, the porosity is 48%
And the minimum. Fig. 14 shows particles with a particle size of 8 µm and a voidage of 50%.
Empty space when particles and particles with a particle size of 2 μm and a porosity of 50% are mixed
The change in intermixing ratio of small particles is also shown. Particle size 2 μm
When mixing the particles, the small particle mixing ratio is 33% by weight.
%, The porosity is 44%, which is the minimum. Also, the particle size is 8μ
m particles with a particle size of 4 μm and particles with a particle size of 2 μm
Compared with the case of mixing the particles, the particle size difference is large.
The decrease in porosity is larger when μm is mixed.
I understand. Also, the larger the difference in particle size, the smaller the porosity.
The small particle mixing ratio becomes small. Particle size of 8μm
Comparison of experimental and calculated results when 4 μm particles are mixed
By comparison, in the experiment, the small particle mixing ratio was around 20% by weight.
The transmittance is in the range of 10 wt% to 40 wt% in the center.
It is low, but the ratio of small particles is 41% by weight.
Fills with a lower mixing ratio in the experiment, which has the lowest porosity
There were areas with good density. This is because each phosphor has particle size
Due to the wideness of the cloth, the large particles and the particle diameter in 8μm
The effect of reducing the porosity due to small particles in 4 μm is large,
The optimum point of small particle mixture ratio in
It is thought that (Example) The present invention will be described below with reference to specific examples.
However, the present invention is not limited to these examples.
Without replacing each element within the range in which the object of the present invention is achieved,
It goes without saying that it includes those that have undergone design changes.
Yes. (Example 1) MIM electron source display device 1 The MIM type electron source display device of the present invention is shown in FIG.
You The MIM type electron source display device 12 has a face
Consists of rate 2, MIM electron source 11, rear plate 7
The MIM type electron source 11 has a lower electrode (Al) 8
Edge layer (Al₂O₃) 9, upper electrode (Ir-Pt-Au) 10
Has been. In particular, blue fireflies on the inside of the face plate 2.
ZnS: Ag, Cl phosphor having an average particle size of 4 μm as an optical body
And a ZnS: Ag, Cl fine particle phosphor having an average particle size of 1 μm
There is a phosphor film 3 mixed with 9% by weight. In addition, the phosphor
Conductive material In to lower resistance₂O₃Mixed with the fluorescent film
It was When making the fluorescent film, polyvinyl chloride is used on the face plate.
To the mixed aqueous solution of alcohol and dichromate, add red (Y_Two
O_TwoS: Eu phosphor), green (ZnS: Cu, Al fluorescence)
Body), blue (ZnS: Ag, Cl phosphor particle size 4 μm, 80
Wt% + particle size 4 μm, 20 wt%)
Pour the mixed slurry of. Exposed through the mask
After development, a phosphor pattern is formed. this
The process is repeated several times to form the fluorescent film. This is another
Repeat the same for the color phosphors,
Formed a mixed fluorescent film. 1 pixel for higher definition
A black conductive material was provided between them. For the production of black conductive material,
A photoresist film is applied on the substrate and exposed through a mask.
Image and leave the photoresist film partially. After that, on the whole surface
After forming the graphite film, apply hydrogen peroxide etc.
Remove the resist film and graphite on it to form a black conductive material.
I made it. The metal back is a film on the inner surface of the fluorescent film 3.
It is created by vacuum deposition of Al after vacuum processing. Then heat
It was prepared by removing the filming agent after processing. like this
Then, the fluorescent film 3 is completed. The brightness maintenance rate according to the present invention is
10% better than before and the energy efficiency of light emission is low
It improved by 10% in the current range and improved by 20% in the high current range. (Example 2) MIM electron source display device part 2 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a blue phosphor is provided inside the face plate 2.
ZnS: Ag phosphor having an average particle size of 4 μm and an average particle size of 1
μm Y₂SiO_Five: Ce fine particle phosphor mixed phosphor screen 3
It How to form conductive material, black conductive material and metal back
The method is the same as in (Example 1). Brightness maintenance according to the present invention
The rate and the energy efficiency of light emission are good as in Example 1.
It was. (Example 3) MIM electron source display device No. 3 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 3 μm_TwoO_TwoS: Eu phosphor and average grain
Y with a diameter of 0.8 μm_TwoO_TwoS: Eu fine particle phosphor is mixed
There is a fluorescent film 3. Conductive material, black conductive material and metal
The method of forming the bag is the same as in (Example 1). The present invention
The luminance maintenance ratio and the energy efficiency of light emission by
Similarly good. (Example 4) MIM electron source display device part 4 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 2.5 μm_TwoO_TwoS: Eu phosphor and flat
Y with a uniform particle size of 1 μm_TwoO_Three: Eu fine particle phosphor was mixed
There is a fluorescent film 3. How to form black conductive material and metal back
The method is the same as in (Example 1). Brightness maintenance according to the present invention
The rate and the energy efficiency of light emission are good as in Example 1.
It was. (Example 5) MIM electron source display device 5 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm_TwoO_TwoS: Eu phosphor and average grain
SrTiO with a diameter of 1 μm₃: Pr fine particle phosphor mixed phosphor film 3
There is. Shape of conductive material, black conductive material and metal back
The production method is the same as in (Example 1). Luminance according to the invention
The maintenance rate and the energy efficiency of light emission are good as in Example 1.
Met. (Example 6) MIM electron source display device No. 6 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And a ZnS: Cu phosphor having an average particle size of 3 μm and an average particle size
Fluorescence mixed with ZnS: Cu fine particle phosphor of 0.8 μm
There is a membrane 3. Conductive material, black conductive material and metal back
The formation method of is similar to that of (Example 1). According to the invention
The brightness maintenance rate and the energy efficiency of light emission are the same as in Example 1.
It was good. (Example 7) MIM electron source display
Device 7 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And a ZnS: Cu phosphor having an average particle size of 3 μm and an average particle size
0.8 μm Y_TwoSiO₅: Tb fine particle phosphor is mixed
There is a fluorescent film 3. Conductive material, black conductive material and metal
The method of forming the bag is the same as in (Example 1). The present invention
The luminance maintenance ratio and the energy efficiency of light emission by
Similarly good. (Example 8) MIM electron source display device 8 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm₂SiO_Five: Tb phosphor and average particle size 1μ
m of Y₂SiO_Five: Tb fine particle phosphor mixed phosphor screen 3
It How to form conductive material, black conductive material and metal back
The method is the same as in (Example 1). Brightness maintenance according to the present invention
The rate and the energy efficiency of light emission are good as in Example 1.
It was. (Example 9) MIM electron source display device No. 9 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm₂SiO_Five: Tb phosphor and average particle size 1μ
There is a phosphor film 3 in which a ZnS: Cu fine particle phosphor of m is mixed. Guide
How to form the conductive material, black conductive material and metal back
This is similar to (Example 1). The brightness maintenance ratio according to the present invention,
The energy efficiency of light emission was as good as in Example 1.
It was (Example 10) MIM electron source display device 10 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm₃(Al, Ga)_FiveO₁₂: Tb phosphor and average grain
There is a phosphor film 3 mixed with ZnS: Cu fine particle phosphor having a diameter of 1 μm.
It How to form conductive material, black conductive material and metal back
The method is the same as in (Example 1). Brightness maintenance according to the present invention
The rate and the energy efficiency of light emission are good as in Example 1.
It was. (Example 11) MIM electron source display device 11 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm₂O₃: Eu phosphor and average particle size 1μm
Y₂O₂There is a phosphor film 3 in which S: Eu fine particle phosphor is mixed. Guide
How to form the conductive material, black conductive material and metal back
This is similar to (Example 1). The brightness maintenance ratio according to the present invention,
The energy efficiency of light emission was as good as in Example 1.
It was (Example 12) MIM electron source display device 12 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And SrTiO with an average particle size of 4 μm₃: Pr phosphor and average particle size 1μ
m of Y₂O₂There is a phosphor film 3 in which S: Eu fine particle phosphor is mixed.
How to form conductive material, black conductive material and metal back
This is similar to (Example 1). The brightness maintenance ratio according to the present invention,
The energy efficiency of light emission was as good as in Example 1.
It was (Example 13) Spindt electron source display device 1 A Spindt type electron source display device of the present invention is shown in FIG.
You Spindt-type electron source display device 19 is
Consists of rate 2, Spindt electron source 18, rear plate 7
The Spindt type electron source 18 has a cathode 13 and a resistance film 1.
4, insulating film 15, gate 16, conical metal (Mo, etc.) 1
It is formed of 7. Especially inside the face plate 2
ZnS: Ag firefly having an average particle size of 4 μm is used as a blue phosphor.
Luminescent material and Y with average particle size of 1 μm₂SiO_Five: Ce fine particle phosphor mixed
There is a fluorescent film 3 formed. Conductive material, black conductive material and meta
The method for forming the rubach is the same as that in (Example 1). Starting
Example 1 shows the brightness maintenance rate and the energy efficiency of light emission by light.
As good as. (Example 14) Spindt electron source display device 2 A Spindt type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 3 μm_TwoO_TwoS: Eu phosphor and average grain
Y with a diameter of 0.8 μm_TwoO_TwoS: Eu fine particle phosphor is mixed
There is a fluorescent film 3. Conductive material, black conductive material and metal
The method of forming the bag is the same as in (Example 1). The present invention
The luminance maintenance ratio and the energy efficiency of light emission by
Similarly good. (Example 15) Spindt electron source display device No. 3 A Spindt type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm₂SiO_Five: Tb phosphor and average particle size 1μ
m of Y₂SiO_Five: Tb fine particle phosphor mixed phosphor screen 3
It How to form conductive material, black conductive material and metal back
The method is the same as in (Example 1). Brightness maintenance according to the present invention
The rate and the energy efficiency of light emission are good as in Example 1.
It was. (Example 16) MIM electron source display device 13 The MIM type electron source display device of the present invention is shown in FIG.
You The MIM type electron source display device 12 has a face
Consists of rate 2, MIM electron source 11, rear plate 7
The MIM type electron source 11 has a lower electrode (Al) 8
Edge layer (Al₂O₃) 9, upper electrode (Ir-Pt-Au) 10
Has been. In particular, blue fireflies on the inside of the face plate 2.
ZnS: Ag, Al phosphor with average particle size of 8μm and average particle
20% by weight of ZnS: Ag, Al small particle phosphor having a diameter of 4 μm was mixed.
There is a fluorescent film 3. The slurry method is used to apply the fluorescent film.
It was Water-soluble mixture of polyvinyl alcohol and dichromate
The phosphor is dispersed in the liquid to prepare a slurry suspension. F
Apply the suspension to the base plate and dry it.
Then, the phosphor is exposed and fixed. Sprayed with warm pure water
Image and wash away the unexposed film to remove the phosphor pattern.
Formed. Black conductive material between 1 pixel to improve definition
Was set up. When manufacturing a black conductive material, a photoresist is used on the entire surface.
The film is applied, exposed through a mask, developed, and partially
Leave the photoresist film. After that, a graphite film is formed on the entire surface
Then use hydrogen peroxide etc. to remove the photoresist film and
The black conductive material was formed by removing the graphite from above. metal
For the back, after filming the inner surface of the phosphor film 3,
It is created by vacuum evaporation of Al. Then heat-treat and fill
It was produced by skipping the minging agent. A battery manufactured according to the present invention.
A field emission display device uses a conventional fluorescent film.
The brightness life was improved by 10% as compared with the case. (Example 17) MIM electron source display device 14 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a blue phosphor is provided inside the face plate 2.
And a ZnS: Ag, Al phosphor with an average particle size of 6 μm and an average particle size of 4 μ
m of ZnS: Ag, Cl small particle fluorescent material is mixed.
It The method for forming the fluorescent film, black conductive material and metal back is
This is the same as (Example 16). The brightness lifetime according to the present invention is
It was as good as (Example 16). (Example 18) MIM electron source display device 15 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And a ZnS: Cu, Al phosphor with an average particle size of 4 μm and an average particle size of 2 μm
m of ZnS: Cu, Al small particle phosphor is mixed.
It How to form the fluorescent film, black conductive material and metal back
This is the same as (Example 16). The brightness lifetime according to the present invention is
It was as good as (Example 16). (Example 19) MIM electron source display device 16 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And Y with an average particle size of 6 μm₂SiO_Five: Tb phosphor and average particle size 2μ
m of ZnS: Cu, Al small particle phosphor is mixed.
It How to form the fluorescent film, black conductive material and metal back
This is the same as (Example 16). The brightness lifetime according to the present invention is
It was as good as (Example 16). (Example 20) MIM electron source display device No. 17 The MIM type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And Y with an average particle size of 8 μm₃(Al, Ga)_FiveO₁₂: Tb phosphor and average grain
Phosphor film 3 containing ZnS: Cu, Al small particle phosphors with a diameter of 4 μm
There is. How to form fluorescent film, black conductive material and metal back
The method is the same as in (Example 16). Luminance life according to the present invention
Life was as good as (Example 16). (Example 21) MIM electron source display device 18 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 4 μm_TwoO_TwoS: Eu phosphor and average grain
Y with a diameter of 3 μm_TwoO_TwoS: Eu Firefly mixed with small particle phosphor
There is a light film 3. Fluorescent film, black conductive material and metal back
The forming method is the same as in (Example 16). According to the invention
The luminance life was as good as that of (Example 16). (Example 22) MIM electron source display device 19 The MIM type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And the average particle size is 8 μm_TwoO_Three: Eu phosphor and average particle size
3 μm Y_TwoO_TwoS: Eu Fluorescence mixed with small particle phosphor
There is a membrane 3. Shape of fluorescent film, black conductive material and metal back
The production method is the same as in (Example 16). Bright according to the invention
The cycle life was as good as (Example 16). (Example 23) Spindt electron source display device part 4 A Spindt type electron source display device of the present invention is shown in FIG.
You Spindt-type electron source display device 19 is
Consists of rate 2, Spindt electron source 18, rear plate 7
The Spindt type electron source 18 has a cathode 13 and a resistance film 1.
4, insulating film 15, gate 16, conical metal (Mo, etc.) 1
It is formed of 7. Especially inside the face plate 2
ZnS: Ag, Al fluorescence with an average particle size of 8 μm as a blue phosphor
Body and ZnS: Ag, Al small particle phosphor of average particle size 6μm
There is a fluorescent film 3. Fluorescent film, black conductive material and metal bag
The method for forming the pits is the same as in (Example 16). In the present invention
The luminance life was good as in (Example 16). (Example 24) Spindt electron source display device No. 5 A Spindt type electron source display device of the present invention is shown in FIG.
You In particular, a green phosphor is provided inside the face plate 2.
And a ZnS: Cu, Al phosphor with an average particle size of 6 μm and an average particle size of 4 μm
m of Y₂SiO_Five: Tb small particle phosphor mixed phosphor screen 3
It How to form the fluorescent film, black conductive material and metal back
This is the same as (Example 16). The brightness lifetime according to the present invention is
It was as good as (Example 16). (Example 25) Spindt electron source display device No. 6 A Spindt type electron source display device of the present invention is shown in FIG.
You Especially, a red phosphor is provided inside the face plate 2.
And Y with an average particle size of 6 μm_TwoO_TwoS: Eu phosphor and average grain
Y with a diameter of 3 μm_TwoO_TwoS: Eu Firefly mixed with small particle phosphor
There is a light film 3. Fluorescent film, black conductive material and metal back
The forming method is the same as in (Example 16). According to the invention
The luminance life was as good as that of (Example 16). (Example 26) Carbon nanotube electron source display
B device 1 Carbon nanotube type electron source display device of the present invention
The device is shown in FIG. Carbon nanotube type electron source
Spray device 23 is face plate 2, carbon nano
It consists of a tube electron source 22 and a rear plate 7.
The carbon nanotube type electron source 22 is
Carbon nanotube layer 21. In particular,
Inside the base plate 2 is a blue phosphor with an average particle size.
8 μm ZnS: Ag, Al phosphor and ZnS: Ag, Cl with an average particle size of 4 μm
There is a phosphor film 3 in which a small particle phosphor is mixed. Fluorescent film, black
The method for forming the conductive material and the metal back is described in (Example 16).
It is the same. The brightness lifetime according to the present invention is (Example 16)
Similarly good. Example 27 Carbon Nanotube Electron Source Display
B device 2 Carbon nanotube type electron source display device of the present invention
The device is shown in FIG. Especially on the inside of the face plate 2.
Is a ZnS: Cu, Al phosphor with an average particle size of 6 μm as a green phosphor
And Y with an average particle size of 5 μm₂SiO_Five: Tb small particle phosphor mixed
There is a fluorescent film 3. Fluorescent film, black conductive material and metal back
The formation method of is similar to that of (Example 16). According to the invention
The luminance life was good as in (Example 16). (Example 28) Carbon nanotube electron source display
B device 3 Carbon nanotube type electron source display device of the present invention
The device is shown in FIG. Especially on the inside of the face plate 2.
Is a red phosphor having an average particle diameter of 6 μm_TwoO_TwoS: Eu
Phosphor and Y with an average particle size of 3 μm_TwoO_Three: Eu small particle phosphor
There is a fluorescent film 3 in which Fluorescent film, black conductive material and
The method for forming talvac is the same as in (Example 16).
The luminance life according to the present invention is as good as that of (Example 16).
there were. (Example 29) Projection type cathode ray tube Part 1 The inner surface of the face plate of the projection type CRT of the present invention is
Y with an average particle size of 8 μm as a green phosphor_TwoSiO₅: Tb
Phosphor and Y with an average particle size of 4 μm_TwoSiO₅: Tb small particle firefly
There is a fluorescent film mixed with a light body. The manufacturing method of the fluorescent film is
The same coating method as in Embodiment 4) was used. According to the invention
The luminance life was as good as that of (Example 16). (Example 30) Projection type cathode ray tube 2 The inner surface of the face plate of the projection type CRT of the present invention is
Y with an average particle size of 6 μm as a green phosphor_TwoSiO₅: Tb
Phosphor and Y with an average particle size of 4 μm_TwoSiO₅: Tb small particle firefly
There is a fluorescent film mixed with a light body. The manufacturing method of the fluorescent film is
The same coating method as in Embodiment 4) was used. According to the invention
The luminance life was as good as that of (Example 16). (Example 31) Projection type cathode ray tube No. 3 The inner surface of the face plate of the projection type CRT of the present invention is
ZnS: Ag, A having an average particle size of 10 μm as a blue phosphor
l Phosphor and ZnS: Ag, Al small particles having an average particle size of 8 μm
There is a phosphor film in which phosphors are mixed. How to make a fluorescent film
The same precipitation coating method as in (Embodiment 4) was used. In the present invention
The luminance life was good as in (Example 16). (Example 32) Projection-type cathode ray tube No. 4 The inner surface of the face plate of the projection type CRT of the present invention is
Y with an average particle size of 8 μm as a red phosphor_TwoO_Three: Eu fluorescence
Body and Y with an average particle size of 4 μm_TwoO_Three: Mixed Eu small particle phosphor
There is a combined fluorescent film. The manufacturing method of the fluorescent film is
The same precipitation coating method as in 4) was performed. Luminance life according to the present invention
Life was as good as (Example 16). (Example 33) Direct-viewing type color cathode ray tube Part 1 Inside the face plate of the direct-view type color CRT of the present invention
ZnS: C with an average particle size of 7 μm as a green phosphor on the surface
u, Al phosphor and ZnS: Cu, Al having an average particle size of 5 μm
There is a phosphor film mixed with small particle phosphors. In the production of fluorescent film
Polyvinyl alcohol and dichromate in a cathode ray tube
Red (Y2O2S: Eu phosphor), green
(ZnS: Cu, Al phosphor particle size 7 μm, 80% by weight +
Particle size 5 μm, 20 wt%), blue (ZnS: Ag, Cl firefly)
Inject the phosphor mixed slurry with one of the phosphors
It When exposed through a mask and then developed, the phosphor
A turn is formed. Repeat this process several times
To form. Do the same for phosphors of other colors
By repeating this, a dot-shaped fluorescent film was formed. In the present invention
The direct-view color cathode-ray tube manufactured by
The brightness life is improved by 10% compared to the case where a film is used.
It was (Example 34) Direct view type color cathode ray tube No. 2 Inside the face plate of the direct-view type color CRT of the present invention
ZnS: A with a mean particle size of 7 μm as a blue phosphor on the surface
g, Cl phosphor and ZnS: Ag, Cl having an average particle size of 5 μm
There is a phosphor film mixed with small particle phosphors. How to make a fluorescent film
The method is the same as in (Example 33). Strike in this way
A lip-shaped fluorescent film was formed. The brightness lifetime according to the present invention is
It was as good as (Example 33).

[0006]

In the field emission display device and the projection type cathode ray tube of the present invention, the mixed fine particle phosphor enters the gap between the main phosphors, the contact between the phosphors increases, and the resistance of the entire phosphor film is suppressed. In addition, since the packing density of the phosphor is increased, the surface area of the whole phosphor is increased, and the current density is reduced, the life of the device can be increased, the brightness can be increased, and the burn-in of the phosphor film can be improved.

[Brief description of drawings]

FIG. 1 is a schematic view showing a fluorescent film structure of the present invention.

FIG. 2 is a schematic diagram showing a phosphor particle size of the present invention.

FIG. 3 is a graph showing the luminance maintenance ratio of the phosphor film of the present invention.

FIG. 4 is a graph showing a luminance current density characteristic of the phosphor film of the present invention.

FIG. 5 is a schematic diagram showing a fluorescent film structure of the present invention.

FIG. 6 is a graph showing a fluorescent film thickness of the present invention.

FIG. 7 is a graph showing the particle size distribution of the present invention.

FIG. 8 is a graph showing the particle size distribution of the present invention.

FIG. 9 is a graph showing the packing density of the fluorescent film of the present invention.

FIG. 10 is a graph showing the relationship between film thickness and film weight of the fluorescent film of the present invention.

FIG. 11 is a graph showing the relationship between the film density and the film weight of the fluorescent film of the present invention.

FIG. 12 is a graph showing light transmittance-film thickness characteristics of the fluorescent film of the present invention.

FIG. 13 is a graph showing the light transmittance-small particle mixing ratio characteristics of the phosphor film of the present invention.

FIG. 14 is a graph showing a calculation result of a porosity-small particle mixing ratio characteristic.

FIG. 15 is a schematic view showing the overall structure of a MIM type electron source display device of the present invention.

FIG. 16 is a schematic view showing the overall structure of a Spindt-type electron source display device of the present invention.

FIG. 17 is a schematic view showing the overall structure of a carbon nanotube type electron source display device of the present invention.

[Explanation of symbols]

2 ... Face plate, 3 ... Fluorescent film, 4 ... Main fluorescent substance, 5 ... Fine particle fluorescent substance, 6 ... Electron beam, 7 ... Rear plate, 8 ... Lower electrode, 9 ... Insulating layer, 10 ... Upper electrode, 11
... MIM type electron source, 12 ... MIM type electron source display device, 13 ... cathode, 14 ... resistive film, 15 ... insulating film, 16
... gate, 17 ... conical metal, 18 ... FED electron source,
19 ... FED type electron source display device, 20 ... Electrode,
21 ... Carbon nanotube layer, 22 ... Carbon nanotube type electron source, 23 ... Carbon nanotube type electron source display device.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) C09K 11/59 CPR C09K 11/59 CPR 11/62 CQB 11/62 CQB 11/66 CPX 11/66 CPX 11 / 67 CPG 11/67 CPG 11/73 CPB 11/73 CPB 11/78 CPJ 11/78 CPJ 11/79 CPN 11/79 CPN 11/80 CPQ 11/80 CPQ 11/84 CPP 11/84 CPP H01J 29 / 18 H01J 29/18 A 29/20 29/20 31/10 31/10 A (72) Inventor Shin Imamura 7-1-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi Ltd. (72) Invention Person Ryo Inoue 7-1-1, Omika-cho, Hitachi-shi, Ibaraki F-term in Hitachi Research Laboratory, Hitachi, Ltd. (reference) 4H001 CA04 CA05 XA08 XA12 XA13 XA14 XA15 XA16 XA17 XA20 XA22 XA30 XA31 XA38 XA39 XA41 XA49 XA50 XA64 YA25 YA30 YA47 YA58 YA59 YA63 YA65 YA83 5C036 AA01 AA10 EE01 EE19 EF01 EF06 EF07 EF09 EG36 EH12 EH22 EH23

Claims (27)

[Claims] 1. A face plate having a fluorescent film formed thereon,
A field emission display device comprising means for irradiating the phosphor film with an electron beam, wherein the phosphor film comprises a main phosphor and a fine particle phosphor having an average particle size smaller than ½ of the main phosphor. An image display device comprising a mixed phosphor. 2. A face plate having a fluorescent film formed thereon,
A field emission display device comprising means for irradiating the fluorescent film with an electron beam, wherein the fluorescent film has an average particle size of
A main phosphor of A and the average particle size B with respect to the main phosphor
An image display device comprising a phosphor mixed with a fine particle phosphor represented by 0.16A ≦ B ≦ 0.28A. 3. In the field emission display device, the acceleration voltage of the electron beam with which the phosphor is irradiated is from 1 kV to 1.
The image display device according to claim 2, wherein the image display device has a range of 5 kV. 4. The image display device according to claim 2, wherein 2 to 50% by weight of the fine particle phosphor is mixed with the main phosphor. 5. The image display device according to claim 2, wherein the fine particle phosphor mixed with the main phosphor has the same composition. 6. The image display device according to claim 2, wherein the main phosphor is a sulfide phosphor, and the fine particle phosphor to be mixed is an oxide phosphor. 7. The main phosphor is a ZnS: Ag phosphor,
The fine particle phosphor to be mixed is Y ₂ SiO ₅ : Ce, (Y, Gd) ₂ SiO ₅ : C
e, ZnGa ₂ O ₄ , CaMgSi ₂ O ₆ : Eu, Sr ₃ MgSi ₂ O ₈ : Eu, Sr ₅ (PO ₄ ) ₃
7. The image display device according to claim 6, wherein the image display device is one or a plurality of types of Cl: Eu, YNbO ₄ : Bi phosphors. 8. The main phosphor is Y ₂ O ₂ S: Eu phosphor, and the fine particle phosphor to be mixed is Y ₂ O ₃ : Eu, SrTiO ₃ : Pr,
The image display device according to claim 6, wherein the phosphor is one or a plurality of phosphors of SnO ₂ : Eu and SrIn ₂ O ₄ : Pr phosphors. 9. The image display device according to claim 2, wherein the main phosphor is an oxide phosphor, and the fine particle phosphor to be mixed is a sulfide phosphor. 10. The main phosphor is Y ₂ SiO ₅ : Tb, (Y, Gd) ₂
SiO ₅ : Tb, Y ₃ (Al, Ga) ₅ O ₁₂ : Tb, (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Tb,
ZnGa ₂ O ₄ : Mn, Zn (Ga, Al) ₂ O ₄ : Mn, ZnO: Zn phosphor, which is one or more kinds of phosphors, and the fine particle phosphor to be mixed is ZnS: Cu, ZnS The image display device according to claim 9, wherein the image display device is any one or a plurality of types of: Cu and Au phosphors. 11. The main phosphor is Y ₂ O ₃ : Eu, SrTiO ₃ : Pr.
10. The image display device according to claim 9, wherein any one or a plurality of types of phosphors are used, and the fine particle phosphors to be mixed are Y ₂ O ₂ S: Eu phosphors. 12. A field emission display device comprising a face plate on which a fluorescent film is formed, and means for irradiating the fluorescent film with an electron beam, wherein the fluorescent film is a main fluorescent substance having an average particle size A. An image display device characterized in that the volume at the position of the particle size B is 2 to 50% by volume larger than the normal distribution curve when it is composed of a phosphor in which a body and a fine particle phosphor having an average particle size B are mixed. 13. When the phosphor film is composed of a phosphor in which a main phosphor having an average particle diameter A and the fine particle phosphor having an average particle diameter B are mixed, the volume at the position of the particle diameter B is a normal distribution curve. The image display device according to claim 12, wherein the image display device is 6 to 12% by volume larger than that. 14. The fine particle phosphor is mixed in an amount of 2 to 50% by weight with respect to the main phosphor.
The image display device described. 15. The image display device according to claim 12, wherein the fine particle phosphors mixed with the main phosphor have the same composition. 16. The image display device according to claim 12, wherein the main phosphor is a sulfide phosphor, and the fine particle phosphor to be mixed is an oxide phosphor. 17. The main phosphor is ZnS: Ag phosphor, and the fine particle phosphor to be mixed is Y ₂ SiO ₅ : Ce, (Y, Gd) ₂ Si.
O ₅ : Ce, ZnGa ₂ O ₄ , CaMgSi ₂ O ₆ : Eu, Sr ₃ MgSi ₂ O ₈ : Eu, Sr ₅ (P
The image display device according to claim 16, wherein the image display device is one or a plurality of O ₄ ) ₃ Cl: Eu, YNbO ₄ : Bi phosphors. 18. The main phosphor is Y ₂ O ₂ S: Eu phosphor, and the fine particle phosphor to be mixed is Y ₂ O ₃ : Eu, SrTiO ₃ : Pr,
The image display device according to claim 16, wherein the image display device is one or a plurality of phosphors of SnO ₂ : Eu and SrIn ₂ O ₄ : Pr phosphors. 19. The image display device according to claim 12, wherein the main phosphor is an oxide phosphor, and the fine particle phosphor to be mixed is a sulfide phosphor. 20. The main phosphor is Y ₂ SiO ₅ : Tb, (Y, Gd) ₂
SiO ₅ : Tb, Y ₃ (Al, Ga) ₅ O ₁₂ : Tb, (Y, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Tb,
ZnGa ₂ O ₄ : Mn, Zn (Ga, Al) ₂ O ₄ : Mn, ZnO: Zn phosphor, which is one or more kinds of phosphors, and the fine particle phosphor to be mixed is ZnS: Cu, ZnS 20. The image display device according to claim 19, wherein the image display device is any one or a plurality of types of: Cu and Au phosphors. 21. The main phosphor is Y ₂ O ₃ : Eu, SrTiO ₃ : Pr.
20. The image display device according to claim 19, wherein any one or a plurality of types of phosphors are used, and the fine particle phosphors to be mixed are Y2O2S: Eu phosphors. 22. A projection type cathode ray tube comprising a face plate having a fluorescent film formed thereon, and means for irradiating the fluorescent film with an electron beam, wherein the average particle size of the fluorescent film is the main phosphor. 5% by weight or more of small small particle phosphor 70
An image display device provided with a fluorescent film, which is characterized by being mixed in a range of not more than wt%. 23. A projection type cathode ray tube comprising a face plate having a fluorescent film formed thereon, and means for irradiating the fluorescent film with an electron beam, wherein the average particle size of the fluorescent film is mainly with respect to the main fluorescent substance. 10% by weight or more of small small particle phosphors 4
An image display device provided with a fluorescent film, characterized in that it is mixed in an amount of 0% by weight or less. 24. The image display device according to claim 23, wherein in the projection type cathode ray tube, the acceleration voltage of the electron beam with which the phosphor is irradiated is in the range of 15 kV to 35 kV. 25. The image display device according to claim 23, wherein the small particle phosphors mixed with the main phosphor have the same composition. 26. A field emission display device comprising a face plate having a fluorescent film formed thereon and means for irradiating the fluorescent film with an electron beam, wherein the fluorescent film has an average grain size with respect to the main fluorescent substance. An image display device provided with a phosphor film, characterized in that a small particle phosphor having a small diameter is mixed in a range of 5% by weight or more and 70% by weight or less. 27. A field emission display device comprising a face plate having a fluorescent film formed thereon and means for irradiating the fluorescent film with an electron beam, wherein the fluorescent film has an average grain size with respect to a main fluorescent substance. An image display device provided with a fluorescent film, characterized in that a small particle phosphor having a small diameter is mixed in a range of 10% by weight or more and 40% by weight or less.