JPH113667A - Cathode ray tube and method of manufacturing cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fill and coat the color slurry without leaving an orbit boundary so as to prevent the generation of unevenness of illuminance by providing a pre-coating solution layer, which has the same composition with a color filter layer, between a carbon layer, which is provided in an inner surface of a face panel for color cathode-ray tube, and a color filter layer, which is made of the pigment having the same color with the light emitted from a phosphor. SOLUTION: A carbon stripe of the predetermined pattern, which is formed in an inner surface of a face panel 2, is coated with the pre-coating solution having the same composition with the color filter slurry of blue, green and red, and development is performed at need. A boundary of orbit is not left at the time of filling the slurry. A blue, a green and a red phosphor stripe layers 12B, 12G, 12R are formed on a blue, a green and a red filters 11B, 11G and 11R, which are formed between carbon stripes on the residual pre-coating solution layer 10, so as to form a fluorescent surface. Concentration of the pigment is desirably set at 12-16.5 wt.% in relation to the pre-coating solution, which includes polyvinyl alcohol distributing agent, cross linking agent and pure water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube and a method of manufacturing the same, and more particularly to a cathode ray tube having a color filter layer and a method of manufacturing the cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, in order to obtain a high-contrast color cathode ray tube (hereinafter, referred to as CRT), a face is formed using a color filter in which a pigment of the same color as the emission color of the phosphor is adhered to the surface of the phosphor particles. 2. Description of the Related Art A CRT having a phosphor adhered to an inner surface of a panel is known. In such phosphor layers with color filters, of the external light that enters, the red pigment selects green or blue component light, the blue pigment selects green or red component light, and the green pigment selects blue or red component light. To improve contrast and color purity.

As described above, the method of forming a phosphor layer with a color filter in the step of forming a phosphor screen, as shown in the process flow diagram of FIG. 5, _first cleans the inside of the face panel and after drying (ST ₁ ) the inside of the face panel. For example, PVP (polyvinyl prolidone) as a photosensitive binder capable of being exposed to ultraviolet light is evenly applied (ST ₂ ), and the next third step ST
After drying in step ₃ , the inner surface exposure (ST ₄ ) is started.

[0004] Using the aperture grill as a mask, a color selection electrode is formed on the inner surface of the face panel for selectively exposing the PVP-coated face panel brought on a frame of an exposure apparatus to perform the inner surface exposure. UV light is radiated from the light source of a high-pressure mercury lamp provided at the lower end of the exposure apparatus to print PVP. A shutter, a filter, a correction lens, and the like are provided between the light source and the face panel. .

After the inner surface exposure ST ₄ is completed, the color selection electrode is removed, a dispersant is injected (ST ₅ ), and the PV of the photosensitive binder is removed.
P is developed, that is, the unexposed portions are removed (ST
₆ ).

Next, PVP as a photosensitive binder is left in a stripe shape, and carbon is uniformly injected and applied (ST ₇ ).
After drying the carbon film (ST ₈ ), hydrogen peroxide is injected (ST ₉ ) to dissolve PVP,
The carbon on P is peeled off. Reversal development of PVP (S
T ₁₀ ) causes carbon stripe (C
S) or a carbon matrix such as a dot matrix surrounding the dots is formed (ST ₁₁ ).

Next, a color filter forming process is started, and the face panel after completion of the carbon matrix is dried (S).
After T ₁₂ ), a color filter slurry is applied to the inner surface of the face panel by a flow coating method (flow coating method) (ST).
₁₃ ). At this time, the color filter slurry is applied while rotating the face panel that is tilted about 10 to 15 degrees while the inner surface of the face panel is held upward. At that time, a color filter layer formed on the inner surface of the face panel is dried by the heater (ST _14), irradiating ultraviolet radiation from a light source of a high pressure mercury lamp aperture grill (AG) of the color selection electrode as a mask, the patterning exposure (ST ₁₅ ). Thereafter, the color filter slurry on the inner surface of the face panel is developed by a mercury lamp (ST ₁₆ ), and a color filter stripe patterning step (S ₁₆ ) is performed.
T ₁₇ ) ends.

In the next phosphor application, a mixed slurry of, for example, a G (green) phosphor and a photosensitive binder, for example, PVA (polyvinyl alcohol), is evenly applied on the CS, and the color selection electrodes are again applied to the face panel. And the inner surface is exposed by a light source of the color of the phosphor of G using the AG as a mask, and is removed from the color selection electrode face panel and developed to elute the unexposed portion of the phosphor and the photosensitive binder. Thus, a G-color stripe fluorescent layer (hereinafter, referred to as PS) of the first color is completed. In the same process, B (blue) and R (red) PSs are formed (ST ₁₈ ).

[0009]

In the above-described process of forming the phosphor layer with a color filter, the color filter slurry is applied to the inner surface of the face panel by a flow coating method.
At this time, as shown in FIG. 6, a color filter slurry 3 is poured from a nozzle 4 on a CS forming surface of the face panel 2 inclined by 10 to 15 degrees from a horizontal plane 1, and a color filter slurry film 5 is formed on the CS surface. The film is formed while rotating (for example, 6 rpm) about the axis 6 of the face panel 2.

Now, when the face panel 2 is rotating counterclockwise at 6 rpm, considering 10 seconds while the face panel 2 makes one round around the axis 6 as shown in FIGS. 7A to 7E. Assuming that the color filter slurry 3 is injected from the injection port 4a of the nozzle 4 as shown in FIG. 7A, the application locus of the color filter slurry 3 at 2.5 second intervals schematically shown in FIG. 7B to FIG. Since the injection trajectory on the side opposite to the rotation direction is always overcoated, the trajectory boundary line 7a does not occur. However, of the trajectory initially injected, the trajectory boundary line 7b on the rotation direction side is formed during the rotation of the face panel about one round. , About 10
There is a problem that the overcoating is not performed for a second and a trace remains as the injection coating trajectory 7b, resulting in luminance unevenness on the color CRT, which leads to a decrease in quality and yield.

The present invention has been made in order to solve the above-mentioned problem, and an object to be solved by the invention is to prevent the injection coating trace 7b from being generated, so that the color filter slurry is applied to the inner surface of the panel before the injection coating. This is one in which injection coating and development of a precoat solution are performed.

[0012]

According to the present invention, a precoat having the same composition as a color filter layer is provided between a carbon layer on the inner surface of a face panel of a CRT and a color filter layer made of a pigment of the same color as that of the phosphor. It has a solution layer.

According to the method of manufacturing a CRT of the present invention, before forming a color filter layer made of a pigment of the same color as a phosphor on a carbon matrix formed on the inner surface of a face panel of a CRT, a precoat having the same composition as this color filter layer is formed. It is formed by applying a solution.

According to the CRT and the method of manufacturing the CRT according to the present invention, there can be obtained an improved quality and yield without leaving a locus boundary line at the time of injecting a color filter slurry, without causing luminance unevenness on a CRT screen. Can be

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a CRT and a CRT according to the present invention will be described.
Will be described in detail with reference to the drawings.

First, FIG. 1 shows a schematic cross-sectional view of a fluorescent screen of a CRT according to this embodiment. This phosphor screen is face panel 2
A light absorbing layer having a predetermined pattern, that is, a black carbon stripe (CS) 8 is bonded to the inner surface of the face panel 2. After the black matrix such as CS8 is completed and dried, a precoat solution having the same components as the R, G, and B color filter slurries 3 is applied, and the precoat solution is applied to the surface of the CS8 and the glass of the face panel 2. After blending into the inner surface, the precoat solution is developed as needed. After the development, a precoat solution layer, that is, a precoat solution residue layer 10 is provided as described later.

The B filter 11B, the G filter 11G, and the R filter 11R are
S8, each color filter 11B, 11G, 11R
The corresponding B phosphor stripe layer 12B, G phosphor stripe layer 12G, and R phosphor stripe layer 12R are formed thereon to form a phosphor screen with a color filter.

The color filters 11B, 11B for each color
G, 11R and fluorescent stripe layers 12B, 12G,
On the phosphor screen of the CRT made of 12R, each color filter 1
External light is absorbed by 1B, 11G, and 11R, and high contrast is obtained.

An example of a method for forming such a phosphor screen will be described with reference to FIGS. FIG. 2 is a process flow chart of the present invention, and FIG. 3 is a process chart of forming a color filter stripe.

In the method of forming a phosphor screen with a color filter according to the present invention, a predetermined pattern of CS8 is formed on the inner surface of the face panel 2 of the CRT as described with reference to FIG. As described in detail in the conventional example, the CS8 is formed by applying a photosensitive binder made of PVP to the inner surface of the face panel 2 and drying it, and then exposing it to ultraviolet light using the color selection electrode as a mask (in this case, the light source position is relatively Exposure is performed three times corresponding to R, G, and B), and development processing such as washing with water is performed to form a stripe-shaped resist layer at a position corresponding to each color. Next, a carbon slurry is applied to the entire surface including the resist layer, dried, and reversely developed (that is, the carbon layer on the resist layer is removed together with the resist layer) to obtain a black stripe having a predetermined pattern, ie, CS.
8 is formed.

[0021] represents a step in FIG first step to twelfth step ST ₁ ～ST black matrix process up to ₁₂ in 2 in FIG. 5 (STP ₁₎ and the black matrix completion and drying (STP _2).

FIG. 3A shows a state in which CSs 8 are formed on the inner surface of the face panel 2 at a predetermined pitch. The process up to the 13 third step shown in FIG. 2 prior to injection application of the color filter slurry in step ST ₁₃ (STP ₃₎ to fifth step in the process flow diagram of a conventional 5 this example (STP ₅₎ to add.

[0023] injecting applying a third step STP ₃ in precoat solution on the inner surface of the face panel 2 as in Figure 3A. At this time, the face panel 2 is held upward on the inner surface.

As a precoat solution, a blue pigment CoO
The case where Al ₂ O ₃ (cobalt aluminate) is selected will be described below.

The precoat solution is a slurry containing a PVA (polyvinyl alcohol) dispersant, a crosslinking agent, pure water, etc.
The blue pigment cobalt aluminate in this slurry was 12.
0% to 16.5% by weight, preferably 14.7% by weight.

Further, a blue pigment, cobalt aluminate, and PV
The ratio (weight ratio) with A is pigment / PVA = 8 to 12%
And preferably, 10% is selected.

This precoat solution is used in the thirteenth step ST
It is a solution of the color filter slurry having the same composition at the time of creating the color filter stripes shown in FIG. 5 to be used in _13.

The pre-coat layer 13 shown in FIG. 3A applied to the outer surface 8a of the CS 8 and the glass surface 2a of the striped face panel between the CSs 8 as described above allows the CS outer surface 8a to be arbitrarily set (for example, 80 seconds). Glass surface 2a
Is adapted with the precoat solution.

[0029] Next appropriately pressure (e.g. 0.2 MPa) and flow rate (e.g., 12 liters / min) water at any time (e.g. 20 seconds) performs a phenomenon of the precoat layer 13 as shown during the fourth step STP ₄ in.

In this development state, macroscopically, the precoat layer 13 is peeled off as shown in FIG.
Since the outer surface 8a is adapted to the precoat solution, the pigment of the precoat solution penetrates microscopically from the outer surface 8a of the CS 8 as shown in FIG. 3C in an enlarged view of a portion A in FIG. 3B.

This is because the diameter of CS particles forming CS8 is 1 μm.
m to 10 μm, whereas the particle size of the pigment in the precoat solution is extremely small, 0.01 μm to 0.07 μm, so that the surface of CS8 can be smoothed and the color filter applied in the next step It is thought to be well compatible with the slurry.

If the glass surface 2a formed between the CSs 8 on the inner surface of the face panel 2 is charged to a negative charge (for example, by applying aminosilane or the like), the precoat solution containing the blue pigment, cobalt aluminate, becomes + The residual layer 10 of the fine particles remains without being removed even by the development, and is well compatible with the color filter slurry in the next color filter slurry injection coating step (ST ₁₃ ).
As shown in FIG. 7E, a color filter slurry having no locus boundary line 7b upon injection was obtained.

The fourth step STP ₄ in injection coating of the same color filter slurry to that shown in FIG. 5 after the development of the pre-coat solution was subjected to drying in the next fifth step STP ₅ upon completion (ST ₁₃₎ following A color filter forming step is performed.

In the above-described precoat solution coating step, only the blue pigment has been described. However, the red pigment is ferric oxide-based Fe ₂ O ₃ and the green pigment is TiO ₂ —N
An iO-CoO-ZnO-based one or the like can be used, but it may be applied to at least one of the R, G, and B color filter stripes, for example, only to the B color filter as described above.

The reason for selecting the B color filter as described above was adopted after considering the following various conditions.

First, when the human visual perception is compared with the luminosity in each of the colors R, G, and B, G has a luminosity that is 2-3 times higher than the other R and B in the order of G → R → B. Have
Regarding the external light reflection (contrast) characteristics, the G color filter only blocks R and B reflected light and has no great effect, and when the R and B color filters are added to the inner surface of the face panel 2, the G color filter has no effect. Since the reflected light is blocked, it is possible to contribute to the improvement of the contrast.

On the other hand, considering the transmission luminance, which is another important condition for adding a color filter, R, G,
If a color filter of each color of B is added to the front surface of the R, G, and B phosphors, the brightness of each color naturally goes down. However, when considering the characteristics of human vision, the brightness of each color is the same. When a G color filter having the highest visibility is added even if it goes down, a significant decrease in luminance is felt, and it is understood that it is not preferable to add a G color filter in front of the G phosphor stripe. . Therefore, in this example, the addition of the G color filter was not performed first.

Next, for the addition of the color filter of R, B
The contrast and transmission brightness when only the color filter with R and R are added and when only B is added are substantially equal, and the R color filter has a complicated stripe manufacturing method and is extremely difficult to manufacture. This is because it has been found that the filter has an advantage that it can be easily manufactured in substantially the same manner as the phosphor manufacturing process, and that the effect of adding only the B color filter is extremely large.

[0039] FIG. 4 shows another process flow diagram of this embodiment, instead of using a solution of the third step STEP ₃ in the color filter slurry having the same composition, to those of the color filter slurry having the same composition On the other hand, it was diluted with pure water, and the ratio of PVA to pigment was the same as that of the color filter slurry, and the pigment concentration was allowed to be 0.45% by weight. In this case, the precoating phenomenon shown in FIG. 2 was performed. Instead, the drying step in the fifth step STEP ₅ can be directly performed as shown in FIG. Of course, a precoat phenomenon may be performed.

In each of the above-described embodiments, the method of injecting and applying the precoat solution has been described in the case where the solution is injected with the face panel 2 facing upward. One in which the locus boundary line 7b does not occur is obtained.

The method of forming the color filter stripe is described in Japanese Patent Application Laid-Open No. H5-2750 previously proposed by the present applicant.
08, etc., and a detailed description will be omitted. The method of injecting and applying the color filter slurry for color filter patterning is not limited to the flow coating method, and a spin coating method, an immersion method, or the like can be used.

[0042]

According to the present invention, it is possible to obtain a CRT having no locus boundary line during color filter slurry injection coating.
C with improved brightness and no quality unevenness
An RT and CRT manufacturing method is obtained.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a fluorescent screen of a cathode ray tube of the present invention.

FIG. 2 is a process flowchart of a method for manufacturing a cathode ray tube according to the present invention.

FIG. 3 is a process chart at the time of applying a precoat solution to the cathode ray tube of the present invention.

FIG. 4 is another process flow chart of the cathode ray tube manufacturing method of the present invention.

FIG. 5 is a process flow chart of a conventional method for manufacturing a cathode ray tube.

FIG. 6 is an explanatory diagram of a conventional color filter slurry injection coating.

FIG. 7 is a diagram showing a pattern pattern when a conventional color filter slurry is injected.

[Explanation of symbols]

2 ‥‥ face panel, 3 ‥‥ color filter slurry,
5 ‥‥ color filter slurry film, 7b ‥‥ locus boundary line,
8 @ CS

────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] September 22, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005] After the end of the inner surface exposure ST ₄ is to remove the color selection electrode, the development of PVP photosensitive binder, i.e., removal of the unexposed portions is performed (ST _5).

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

Next, PVP as a photosensitive binder is left in a stripe shape, and carbon is uniformly injected and applied (ST ₆ ).
After the carbon film is dried (ST ₇ ), hydrogen peroxide is injected (ST ₈ ) to dissolve PVP,
The carbon on P is peeled off. Reversal development of PVP (S
T ₉ ) causes carbon stripe (C
S) or a carbon matrix such as a dot matrix surrounding the dots is formed (ST ₁₀ ).

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

Next, a color filter forming process is started, and the face panel after completion of the carbon matrix is dried (S).
T ₁₁ ), a color filter slurry is applied to the inner surface of the face panel by a flow coating method (flow coating method) (ST 11).
₁₂ ) Yes. At this time, the color filter slurry is applied while rotating the face panel that is tilted about 10 to 15 degrees while the inner surface of the face panel is held upward. At this time, the color filter film formed on the inner surface of the face panel is dried (ST ₁₃ ) by a heater, and ultraviolet light is irradiated from a light source of a high-pressure mercury lamp using the aperture grill (AG) of the color selection electrode as a mask to perform patterning exposure (ST ₁₃ ). ₁₄ ) Yes. Thereafter, the color filter slurry inner surface of the face panel is developed (ST _15), the color filter stripes patterning step (ST ₁₆₎ is ended.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

In the next phosphor application, a mixed slurry of, for example, a G (green) phosphor and a photosensitive binder, for example, PVA (polyvinyl alcohol), is evenly applied on the CS, and the color selection electrodes are again applied to the face panel. And the inner surface is exposed by a light source of the color of the phosphor of G using the AG as a mask, and is removed from the color selection electrode face panel and developed to elute the unexposed portion of the phosphor and the photosensitive binder. Thus, a G-color stripe fluorescent layer (hereinafter, referred to as PS) of the first color is completed. In the same process, B (blue) and R (red) PSs are formed (ST ₁₇ ).

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

The precoat solution is a slurry containing a PVA (polyvinyl alcohol) dispersant, a crosslinking agent, pure water, etc.
The blue pigment cobalt aluminate in this slurry was 12.
From 0% to 16.5% by weight, preferably 14.7% by weight is selected.

[Procedure amendment 6]

[Document name to be amended] Drawing

[Correction target item name] Fig. 5

[Correction method] Change

[Correction contents]

FIG. 5

Claims (5)

[Claims] 1. A precoat solution layer having the same composition as a color filter layer is provided between a carbon layer on an inner surface of a face panel of a cathode ray tube and a color filter layer made of a pigment having the same color as that of a phosphor. Characteristic cathode ray tube. 2. Prior to forming a color filter layer made of a pigment of the same color as a phosphor on a carbon matrix formed on the inner surface of the face panel of a cathode ray tube, a precoat solution having the same composition as the color filter layer is applied. A method for producing a cathode ray tube. 3. A step of applying a precoat solution having the same composition as that of the color filter layer on a carbon matrix formed on the inner surface of the face panel of the cathode ray tube; a step of developing and drying the precoat solution; 3. A color filter layer is formed by a step of injecting and applying a color filter slurry of the same color as the emission color of the phosphor after development and drying of the color filter.
The method for manufacturing the cathode ray tube according to the above. 4. A step of applying a precoat solution having the same composition as that of the color filter layer and a dilute solution of pure water on a carbon matrix formed on an inner surface of the face panel of the cathode ray tube; and a step of drying the precoat solution. 3. The method for manufacturing a cathode ray tube according to claim 2, wherein a color filter layer is formed by a step of injecting and applying a color filter slurry having the same color as the emission color of the phosphor after drying the precoat solution. 5. The cathode ray tube according to claim 2, wherein the concentration of the pigment in the color filter slurry or the precoat solution is 12.0 to 16.5% by weight. Manufacturing method.