JPH113656A - Method for correcting chromaticity of phosphor slurry - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly, surely and accurately adjust the chromaticity in the case where abnormality of the chromaticity is generated in the fluorescent surface adjusting phosphor slurry by mixing an appropriate quantity of phosphor slurry for adjusting chromaticity in different color from the fluorescent surface adjusting slurry in the fluorescent surface adjusting phosphor slurry, of which chromaticity is to be adjusted. SOLUTION: In the case of correcting chromaticity of the green fluorescent surface adjusting phosphor slurry, a blue chromaticity adjusting phosphor slurry at 4 wt.% or less or a red chromaticity adjusting phosphor slurry at 4 wt.% or less is mixed. In the case of correcting chromaticity of the blue fluorescent surface adjusting phosphor slurry, a green chromaticity adjusting phosphor slurry at 2 wt.% or less or a red chromaticity adjusting phosphor slurry at 2 wt.% or less is mixed. In the case of correcting chromaticity of the red fluorescent surface adjusting phosphor slurry, a green chromaticity adjusting phosphor slurry at 3 wt.% or less or a blue chromaticity adjusting phosphor slurry at 1 wt.% or less is mixed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for correcting the chromaticity of a phosphor slurry for preparing a phosphor screen. The present invention relates to a method for correcting the chromaticity of a phosphor slurry, which enables quick, reliable, and accurate chromaticity adjustment.

[0002]

2. Description of the Related Art Although color cathode ray tubes are widely used for television receivers, recently, they are also often used as displays for computers, and accordingly, the required quality for chromaticity has become extremely strict. .
In addition, high image quality is also required for home television receivers, and high-resolution, high-quality color cathode ray tubes for broadcast stations are required to have higher quality than before, so that the quality required for chromaticity is inevitably higher.

[0003] Specifically, for example, E
The chromaticity of the three primary colors must be controlled according to different standards of color tone such as BU color, SMPTE-C color, and SONY color. As the resolution increases, it becomes more difficult to control the chromaticity within a standard. The chromaticity is represented by, for example, an x-axis and a y-axis according to a CIE chromaticity diagram as shown in FIG.
It can be represented by axis coordinates.

Here, how to form the three primary color phosphors will be described with reference to a Trinitron (trade name) type color cathode ray tube as an example. After forming a carbon stripe on the inner surface of the panel of the color cathode ray tube, GREEN (green), BL
Three color phosphor stripes of UE (blue) and RED (red) are formed in that order. The formation of a fluorescent stripe of one color comprises the steps of applying, drying, exposing, and developing a phosphor slurry for preparing a phosphor screen. In order to form a phosphor stripe of all three colors, the series of steps must be repeated three times. There is.

More specifically, as shown in FIG. 2, the process for producing a fluorescent stripe comprises the steps of producing a carbon stripe, applying a phosphor slurry for preparing a phosphor screen, drying / skirting, UV exposure, and development. After the phosphor stripe, as shown in FIG.
The color cathode ray tube is manufactured by being processed in each step of electron gun sealing, exhausting, aging, explosion-proof, and inspection.

The phosphor slurry for preparing a phosphor screen is:
A phosphor that emits light in the primary color when it receives an electron beam, is made into a slurry by adding a photosensitive liquid, an adhesive (made of a high-molecular polymer, etc.), a surfactant, a dispersant, etc., according to the required color tone. There is a standard for the composition ratio and the like of each phosphor slurry for preparing a phosphor screen. The chromaticity defect is determined by the inspection of the single color tone (red, blue, green) in the inspection process of FIG. 3, and is classified into product specifications OK or NG. Conventionally, when a chromaticity defect occurs, it is necessary to respond to a change in manufacturing specifications such as a change in development specifications (pressure of development water, development time, supply amount of development water), a change in exposure specification (exposure amount),
This has been dealt with by changing the specifications (surface treatment conditions, chromaticity of the powder) regarding the phosphor.

However, as described above, when the required quality of chromaticity becomes severe, slight color mixing and scattering of electron beams cause color misregistration, making it difficult to control the chromaticity within the standard. It is becoming impossible to cope with the method of coping. The color mixing occurs when, for example, in the exposure and development steps, a phosphor component of another primary color, for example, a BLUE stripe adheres after the formation of a stripe of a certain color, for example, a GREEN stripe, and an electron beam hits the GREEN stripe. Although only GREEN light should emit light, BLUE light also emits light, and thus should be avoided.

The color shift due to the scattering of the electron beam is caused by the fact that an electron beam hitting one stripe is partially reflected, enters another stripe, and emits light there.
Further, for example, there is a case where a phosphor powder of a certain color is mixed with another phosphor powder and cannot be removed by washing with water. In this case, a color shift occurs. Such color misregistration should be corrected, but it has not been possible to respond quickly and accurately in the past. Specifically, the production specifications such as development conditions and exposure conditions were changed as described above. However, in such a method, the control width of the chromaticity adjustment was greatly affected by the characteristics other than the chromaticity. May be narrow, and the phosphor may fall off or have wrinkles. There is also a method of changing the chromaticity of the phosphor material to be used, but since it takes one to two months to commercialize after requesting a phosphor material manufacturer, it is difficult to keep the delivery date of the color cathode ray tube, It was fatal for the type of color cathode ray tube to be produced.

As a technique for solving the above problems,
Japanese Patent Application Laid-Open No. Hei 8-32263 discloses a method of mixing a phosphor for preparing chromaticity of another color with a phosphor slurry for preparing a phosphor screen having abnormal chromaticity. Specifically, in forming the phosphor screen of the color cathode ray tube, a color cathode ray tube is prototyped as designed in advance and tested for chromaticity and the like. For example, when an abnormality occurs in a phosphor such as GREEN or RED, When making a slurry of the phosphor having the chromaticity abnormality, the chromaticity is adjusted by mixing the slurry with, for example, a BLUE phosphor, and the prototype is re-produced. If this is confirmed, the actual production of the color cathode ray tube is performed using the slurry in which the chromaticity adjusting phosphor is mixed as the phosphor slurry. Although this method can surely perform chromaticity adjustment even if chromaticity abnormality occurs and is useful, it is a method of substantially regenerating a phosphor slurry for preparing a phosphor screen, and chromaticity adjustment is performed in the slurry. In order to completely disperse the phosphor for use, a dispersion time of 24 to 72 hours is still required, and there is room for improvement in production efficiency. Further, even if such a dispersion time is provided, there is a disadvantage that it is difficult to completely disperse the chromaticity adjusting phosphor in the slurry.

[0010]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to make it possible to perform chromaticity adjustment more quickly, more reliably, and more accurately than in the past, when chromaticity abnormality occurs in the phosphor slurry for preparing a phosphor screen. An object of the present invention is to provide a method for correcting chromaticity of a phosphor slurry.

[0011]

Means for Solving the Problems The present inventors have made intensive studies to solve the above-mentioned conventional problems, and as a result, have completed the present invention. That is, the present invention provides a phosphor screen preparation phosphor slurry used for preparing a phosphor screen of a color cathode ray tube, and mixing an appropriate amount of a chromaticity adjusting phosphor slurry of a color different from the phosphor screen preparation slurry. And a method for correcting the chromaticity of the phosphor slurry. Further, the present invention provides the phosphor, wherein the phosphor slurry for preparing a green phosphor screen is mixed with 4% by weight or less of a blue chromaticity adjusting phosphor slurry or 4% by weight or less of a red chromaticity adjusting phosphor slurry. An object of the present invention is to provide a method for correcting the chromaticity of a slurry. Further, the present invention provides the above phosphor, wherein the phosphor slurry for preparing a blue phosphor screen is mixed with 2% by weight or less of green phosphor slurry for adjusting chromaticity or 2% by weight or less of red phosphor slurry for adjusting chromaticity. An object of the present invention is to provide a method for correcting the chromaticity of a slurry. Furthermore, the present invention relates to a phosphor slurry for preparing a green chromaticity, which is added to a phosphor slurry for preparing a red phosphor screen.
It is an object of the present invention to provide a method for correcting the chromaticity of the phosphor slurry in which the phosphor slurry for adjusting the chromaticity of blue is mixed with 1% by weight or less.

[0012]

According to the present invention, a phosphor slurry for preparing a phosphor screen used for preparing a phosphor screen of a color cathode ray tube is used for adjusting the chromaticity of a color different from that of the phosphor screen preparation slurry. Since the phosphor slurries are mixed, that is, the fluids are mixed with each other, the two can be mixed and dispersed very well. Therefore, there is a remarkable effect that no problem of non-dispersion between the chromaticity adjusting phosphor, which is a powder, and the phosphor slurry, which is a fluid, which is observed in the prior art, occurs at all. There is one feature of the present invention.

As the phosphor slurry for adjusting chromaticity used in the present invention, a phosphor slurry used for preparing a phosphor screen of a color cathode ray tube which has been generally used can be used. Pure water, polyvinyl alcohol, ammonium bichromate, surfactant (several types) for phosphor
And the like.

As described above, the phosphor slurry for adjusting the chromaticity is mixed with an appropriate amount of the phosphor slurry for preparing the phosphor screen to be corrected in chromaticity. It is preferable that the mixing amount of the chromaticity adjusting phosphor slurry be in the following ratio. Various conditions such as the phosphor concentration in the chromaticity adjusting phosphor slurry may be appropriately determined.

When correcting the chromaticity of the phosphor slurry for preparing a green phosphor screen: 4% by weight or less of the blue chromaticity adjusting phosphor slurry or the red chromaticity adjusting phosphor slurry 4
% By weight or less. When correcting the chromaticity of the phosphor slurry for preparing a blue phosphor screen: 2% by weight or less of the green chromaticity adjusting phosphor slurry or 2% by weight or less of the red chromaticity adjusting phosphor slurry. When correcting the chromaticity of the phosphor slurry for preparing the red phosphor screen: 3% by weight or less of the green chromaticity adjusting phosphor slurry or 1% by weight or less of the blue chromaticity adjusting phosphor slurry.

For example, when correcting the chromaticity of the phosphor slurry for preparing a phosphor screen of GREEN, the phosphor slurry for adjusting the chromaticity has a lower luminance phosphor than a phosphor slurry of RED which is a high luminance phosphor. BLUE phosphor slurry is more preferable. The reason is that when the RED phosphor slurry is used for adjusting the chromaticity, the brightness tends to slightly decrease, whereas the phosphor slurry for adjusting the chromaticity of the BLUE does not have this disadvantage, and is relatively difficult. This is because the chromaticity can be largely changed with a small amount. In addition, BLUE
There is no problem with the white uniformity whether the chromaticity adjusting phosphor slurry is mixed or the RED chromaticity adjusting phosphor slurry is mixed.
As described above, when correcting the chromaticity of the phosphor slurry of the high-luminance phosphor, the phosphor slurry for adjusting the chromaticity contains a lower-luminance phosphor than the phosphor slurry for preparing the phosphor screen whose chromaticity is corrected. Phosphor slurries are preferred.

Further, a chromaticity adjusting phosphor slurry of the same type of color is mixed (for example, GR) to correct the chromaticity of one phosphor.
YELLOWISHGREE for phosphor slurry of EEN
Although the chromaticity cannot be corrected by mixing the chromaticity adjusting phosphor slurry (N), the chromaticity is changed unless the mixing amount of the chromaticity adjusting phosphor slurry is considerably increased. In this case, the luminance greatly changes and the white uniformity also changes. Therefore, it is preferable to use a chromaticity adjusting phosphor slurry having a single tone of a completely different color.

In the concrete implementation of the present invention, when forming the fluorescent screen of the color cathode ray tube, a color cathode ray tube is prototyped as designed in advance and tested for chromaticity and the like, and a phosphor such as GREEN or RED is used. If an abnormality occurs in the phosphor slurry for phosphor screen preparation in which the chromaticity abnormality has occurred, an appropriate amount of the phosphor slurry for adjusting the chromaticity of another color is mixed with the phosphor slurry for adjusting the chromaticity. If it is confirmed that there is no abnormality in the chromaticity test etc., manufacture the actual color cathode ray tube using the slurry mixed with the chromaticity adjusting phosphor as the phosphor slurry. Can be.

According to the method of the present invention, the correction of chromaticity, which required at least 24-72 hours in the prior art, can be greatly reduced to only a few minutes. In addition, the phosphor slurry for adjusting chromaticity, which has been conventionally discarded outside the product standard, can be used, which is very advantageous in terms of cost and environment. Further, since chromaticity is corrected between fluids, delicate correction becomes possible, and accuracy is remarkably improved.

[0020]

The present invention will be further described below with reference to examples. The phosphor slurry for adjusting the chromaticity of each color is added to the slurry for preparing the phosphor screen of a single color tone (red, blue, green), and C
The IE chromaticity was measured. Table 1 also shows the addition ratio of the phosphor slurry for adjusting the chromaticity of each color and the fluctuation value of the CIE chromaticity.

[0021]

[Table 1]

In this embodiment, the mixture of the phosphor slurry for preparing the phosphor screen and the phosphor slurry for adjusting the chromaticity of each color is
It could be performed very easily, the phosphor was well dispersed, and the precision of chromaticity adjustment was good. In addition, the desired CIE chromaticity could be adjusted by slightly mixing the chromaticity adjusting phosphor slurry.

[0023]

According to the present invention, when a chromaticity abnormality occurs in the phosphor slurry for preparing a phosphor screen, the color of the phosphor slurry can be adjusted more quickly, more reliably and more accurately than in the past. A degree correction method is provided.

[Brief description of the drawings]

FIG. 1 is a CIE chromaticity diagram.

FIG. 2 is a view showing a process for producing a fluorescent stripe.

FIG. 3 is a diagram showing a process for producing a color cathode ray tube.

Claims (4)

[Claims] 1. An appropriate amount of a phosphor slurry for adjusting chromaticity of a color different from the slurry for preparing a phosphor screen is mixed with a phosphor slurry for preparing a phosphor screen used for preparing a phosphor screen of a color cathode ray tube. A chromaticity correction method for a phosphor slurry. 2. A phosphor slurry for preparing a green phosphor screen,
2. The chromaticity correction method for a phosphor slurry according to claim 1, wherein 4% by weight or less of a blue chromaticity adjusting phosphor slurry or 4% by weight or less of a red chromaticity adjusting phosphor slurry is mixed. 3. The phosphor slurry for preparing a blue phosphor screen,
2. The chromaticity correction method for a phosphor slurry according to claim 1, wherein 2% by weight or less of a green chromaticity adjusting phosphor slurry or 2% by weight or less of a red chromaticity adjusting phosphor slurry is mixed. 4. The phosphor slurry for preparing a red phosphor screen,
2. The chromaticity correction method for a phosphor slurry according to claim 1, wherein 3% by weight or less of a green chromaticity adjusting phosphor slurry or 1% by weight or less of a blue chromaticity adjusting phosphor slurry is mixed.