JP2000268721A - Manufacture of display discharge panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To coat a sufficient amount of phosphor in a single operation without dispersion treatment which degrades brightness of the phosphor and without a heat treatment process. SOLUTION: In this manufacture method, a mask member 3 having a transparent part corresponding to a part covered with phosphor of a discharge cell of this display discharge panel 4 is arranged to be in close contact with the display discharge panel 4. The phosphor 2 processed into micro powder and charged is sprayed to the mask member 3 by using an electrostatic powder coating machine 1, and the phosphor 2 covers an inside of the discharge cell corresponding to the transparent part of the mask member 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display discharge panel configured to excite a fluorescent substance in a discharge cell with ultraviolet rays generated by generation of a discharge in the discharge cell to obtain display light, and to discharge the fluorescent substance. The present invention relates to a method for manufacturing a display discharge panel which can be easily and suitably formed on a desired portion of a cell.

[0002]

2. Description of the Related Art In a display discharge panel, a phosphor is applied to each discharge cell in which a discharge is generated. As a method of applying the phosphor, a phosphor is mixed with a binder and a paste is applied. There is a method of printing a thick ink by using a screen printing method as a thick ink, or a method of mixing a phosphor and a binder into a liquid state and spraying the liquid using a mask member.

[0003]

In the above-mentioned conventional method for applying a phosphor, a binder is used to make the phosphor into a paste, and the phosphor is uniformly dispersed in the binder. In this case, a disperser such as a ball mill is used, but there is a possibility that the crystal of the surface layer of the phosphor is damaged by this dispersion treatment and the original luminance of the phosphor is reduced. Further, after applying the paste-like ink, it is necessary to perform a work step of firing the ink at a high temperature to decompose the synthetic resin as a component thereof and leave the phosphor. In the method of thick film printing, in order to apply a sufficient amount of phosphor paste to the inner surface of the concave portion of the discharge cell, the paste is reduced in viscosity (in an AC type display discharge panel) and printed several times. Work is being done. However, the screen plate used for screen printing is deformed as the frequency of use increases,
If one display discharge panel is used a plurality of times, the display discharge panel is frequently replaced, which is disadvantageous in cost because the screen plate is expensive.

In a direct current type display discharge panel,
For example, in the case where a mask member having a shape in which the mixed paste of the phosphor and the binder is applied only to the anode portion and the cathode portion in a single coating operation is used, the paste is spread by the heat treatment, and the anode portion and the cathode portion are spread. Could be buried. For this purpose, a parallel two-line painting method is used. Further, since it is necessary to remove the phosphor coated on the surface of the cathode portion to be exposed for discharge, a step of removing the phosphor on the surface of the cathode portion by a sandblast method using a mask member is also required.

Therefore, in the present invention, in order to solve the above-mentioned problems, a dispersion treatment for lowering the luminance of the phosphor is not performed, a heat treatment step is not required, and a sufficient amount of phosphor is required in one operation. It is an object of the present invention to provide a method for manufacturing a display discharge panel to which a liquid crystal can be applied.

[0006]

In order to achieve the above object, a method of manufacturing a display discharge panel according to the present invention comprises the steps of:
A back substrate in which a plurality of electrodes are arranged side by side at regular intervals,
A front substrate in which a plurality of strip-shaped second electrodes are arranged at predetermined intervals is arranged so that the first electrode and the second electrode intersect at a predetermined interval, and discharge is performed at the intersection. A method for manufacturing a display discharge panel in which a cell is formed and a phosphor is applied in the discharge cell, the mask member having a transparent portion corresponding to a portion of the discharge cell on which the phosphor is applied is formed by using the mask member. A fine powdered phosphor, which is brought into close contact with the rear substrate and / or the front substrate and charged using an electrostatic powder coating machine, is sprayed toward the mask member, and a discharge cell corresponding to a transmission portion of the mask member The above-mentioned phosphor is deposited and formed therein.

[0007]

FIG. 1 shows a first embodiment of a method for manufacturing a display discharge panel according to the present invention, in which, for example, a positive charge is applied from a spray type electrostatic powder coating machine 1. Display powder panel 4 (more precisely, a back substrate constituting the display discharge panel) in which a fine powdery phosphor 2 is ejected in the form of a mist and a mask member 3 is superposed on the surface thereof and a negative charge is applied thereto. Alternatively, the fluorescent substance 2 that has passed through the transparent portion of the mask member 3 is applied to the display discharge panel 4 by disposing a front substrate (or a front substrate). One display discharge panel 4
When a plurality of types of phosphors are applied to the substrate, a number of mask members corresponding to the number are prepared, and the phosphors are applied one by one.

[0008] Unlike the coating method in which a liquid paint or the like containing a binder is ejected, the electrostatic powder coating machine 1 discharges a powder (a phosphor in this embodiment) itself containing no binder. As a result, the charged phosphor 2 discharged from the nozzle 1a of the electrostatic powder coating machine 1 can perform efficient operation without waste, and the surface of the display discharge panel 4 is not only discharged by the discharge speed but also electrostatically attracted. The discharge cells reach the corners of the discharge cells having irregularities formed on the substrate and are reliably and sufficiently applied. In this electrostatic powder coating machine 1, there are a corona discharge type and a triboelectric charging type as a method for charging the powder.
In this embodiment, either type of electrostatic powder coating machine may be used.

FIG. 2 shows a second embodiment of the method for manufacturing a display discharge panel according to the present invention. In place of the spray type electrostatic powder coating machine 1 described above, a fluidized-bed type electrostatic powder is used. The body coating machine 5 is used. This involves suspending a display discharge panel 4 to which, for example, a negative charge has been applied by superposing a mask member 3 on the surface, and disposing a tank 6 having a large number of discharge holes at the bottom for blowing air below the display discharge panel 4. A positive charge is applied to the powder of the phosphor 2 by the positive charging net 5 a arranged in the tank 6 while the powder of the phosphor 2 flows in the tank 6.

When the display discharge panel is coated with, for example, each phosphor emitting red, blue, and green light, first, the phosphor for red is coated in the tank 6 in which the phosphor for red flows. The mask member 3 for attachment is superimposed on the surface, and the display discharge panel to which the negative charge is applied is positioned above the tank 6, so that the positive fluorescent substance 2 is electrostatically attracted to the surface of the negative display discharge panel 4. Painted on. next,
The red mask member is removed from the display discharge panel, and instead a blue mask member is superimposed on the display discharge panel. Is applied. Further, the mask member for blue is removed from the display discharge panel, and the mask member for green is stacked instead. It is to apply the body.

According to the second embodiment, the painting booth required in the first embodiment is not required, so that the work can be performed even in a relatively narrow space, and the powder is not scattered. Therefore, there is no waste of the phosphor used and a suitable working environment can be obtained.

In the above-described embodiment, a case has been described in which a positive charge is applied to the powdery phosphor and a negative charge is applied to the display discharge panel. However, the present invention is not limited to this. However, the opposite charges may be applied.

[0013]

As described above in detail, according to the method for manufacturing a display discharge panel of the present invention, a powdery phosphor containing no binder is used by an electrostatic powder coating machine by utilizing an electrostatic adsorption action. Can be applied to each discharge cell of the display discharge panel, so that a sufficient amount of phosphor can be applied to each discharge cell, and the mask member can be applied only once for each type of phosphor. Therefore, the phosphor can be repeatedly used, the production cost can be reduced, and since the disperser such as a conventional ball mill is not used, the phosphor's original brightness can be obtained without damaging the phosphor crystals. Furthermore, the work step of baking the applied paste-like phosphor layer at a high temperature to decompose the synthetic resin of the binder component and leave the phosphor, which is conventionally required, is completely unnecessary, and the man-hour is further reduced. Things.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a method for manufacturing a display discharge panel according to the present invention.

FIG. 2 is an explanatory view showing a second embodiment of the method for manufacturing a display discharge panel according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrostatic powder coating machine 1a Nozzle 2 Phosphor 3 Mask member 4 Display discharge panel 5 Electrostatic powder coating machine 5a Charging net 6 tank

[Procedure amendment]

[Submission date] December 28, 1999 (1999.12.
28)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Patent application title: Method for manufacturing display discharge panel

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display discharge panel configured to excite a fluorescent substance in a discharge cell with ultraviolet rays generated by generation of a discharge in the discharge cell to obtain display light, and to discharge the fluorescent substance. The present invention relates to a method for manufacturing a display discharge panel which can be easily and suitably formed on a desired portion of a cell.

[0002]

2. Description of the Related Art In a display discharge panel, a phosphor is applied to each discharge cell in which a discharge is generated. As a method of applying the phosphor, a phosphor is mixed with a binder and a paste is applied. There is a method of printing a thick ink by using a screen printing method as a thick ink, or a method of mixing a phosphor and a binder into a liquid state and spraying the liquid using a mask member.

[0003]

In the above-mentioned conventional method for applying a phosphor, a binder is used to make the phosphor into a paste, and the phosphor is uniformly dispersed in the binder. In this case, a disperser such as a ball mill is used, but there is a possibility that the crystal of the surface layer of the phosphor is damaged by the dispersion treatment and the intrinsic luminance of the phosphor is reduced. Further, after applying the paste-like ink, it is necessary to perform a work step of firing the ink at a high temperature to decompose the synthetic resin as a component thereof and leave the phosphor. In the method of thick film printing, in order to apply a sufficient amount of phosphor paste to the inner surface of the concave portion of the discharge cell, the paste is reduced in viscosity (in an AC type display discharge panel) and printed several times. Work is being done. However, the screen plate used for screen printing is deformed as the frequency of use increases,
If one display discharge panel is used a plurality of times, the display discharge panel is frequently replaced, which is disadvantageous in cost because the screen plate is expensive.

In a direct current type display discharge panel,
For example, in the case where a mask member having a shape in which the mixed paste of the phosphor and the binder is applied only to the anode portion and the cathode portion in a single coating operation is used, the paste is spread by the heat treatment, and the anode portion and the cathode portion are spread. Could be buried. For this purpose, a parallel two-line painting method is used. Further, since it is necessary to remove the phosphor coated on the surface of the cathode portion to be exposed for discharge, a step of removing the phosphor on the surface of the cathode portion by a sandblast method using a mask member is also required.

Therefore, in the present invention, in order to solve the above-mentioned problems, a dispersion treatment for lowering the luminance of the phosphor is not performed, a heat treatment step is not required, and a sufficient amount of phosphor is required in one operation. It is an object of the present invention to provide a method for manufacturing a display discharge panel to which a liquid crystal can be applied.

[0006]

In order to achieve the above object, a method of manufacturing a display discharge panel according to the present invention comprises the steps of:
A back substrate in which a plurality of electrodes are arranged side by side at regular intervals,
A front substrate in which a plurality of strip-shaped second electrodes are arranged at predetermined intervals is arranged so that the first electrode and the second electrode intersect at a predetermined interval, and discharge is performed at the intersection. A method for manufacturing a display discharge panel in which a cell is formed and a phosphor is applied in the discharge cell, the mask member having a transparent portion corresponding to a portion of the discharge cell on which the phosphor is applied is formed by using the mask member. A discharge hole that blows air is provided at the bottom while being close to the rear substrate and / or front substrate.
The powder of the phosphor placed inside is made to flow and the phosphor is
To place a charging net to apply charge to powder
In the tank, the above-described spine applied with a charge having a polarity opposite to that of the phosphor is applied.
Fluorescent charged by inserting a surface substrate and / or front substrate
Discharge of the powder of the light body corresponding to the transmission part of the mask member
It is characterized by being formed in a cell .

[0007]

FIG. 1 shows a first embodiment relating to a method of manufacturing a display discharge panel according to the present invention.
For example, a fine powdery phosphor 2 to which a positive charge is applied is ejected in the form of a mist from a spray type electrostatic powder coating machine 1, and a mask member 3 is superposed on the surface in front of the fine powdery phosphor 2 to apply a negative charge. Display phosphor panel 4 (more precisely, a rear substrate or a front substrate constituting the display discharge panel) so that the phosphor 2 passing through the transparent portion of the mask member 3 is applied to the display discharge panel 4. It is. When a plurality of types of phosphors are applied to one display discharge panel 4, a number of mask members corresponding to the number are prepared, and the phosphors are applied one by one.

[0008] Unlike the coating method in which a liquid paint or the like containing a binder is ejected, the electrostatic powder coating machine 1 discharges a powder (a phosphor in this embodiment) itself containing no binder. Therefore, the efficient operation without waste can be performed, and the charged phosphor 2 discharged from the nozzle 1a of the electrostatic powder coating machine 1 has the surface of the display discharge panel 4 not only by its discharge speed but also by electrostatic attraction. Thus, it reaches the corners of the discharge cell having irregularities formed on the surface of the substrate and is reliably and sufficiently applied. In this electrostatic powder coating machine 1, there are a corona discharge type and a triboelectric charging type as a method for charging the powder.
In this embodiment, either type of electrostatic powder coating machine may be used.

FIG. 2 shows a second embodiment of the method for manufacturing a display discharge panel according to the present invention. In place of the spray type electrostatic powder coating machine 1 described above, a fluidized-bed type electrostatic powder is used. The body coating machine 5 is used. This involves suspending a display discharge panel 4 to which, for example, a negative charge has been applied by superposing a mask member 3 on the surface, and disposing a tank 6 having a large number of discharge holes at the bottom for blowing air below the display discharge panel 4. A positive charge is applied to the powder of the phosphor 2 by the positive charging net 5 a arranged in the tank 6 while the powder of the phosphor 2 flows in the tank 6.

When the display discharge panel is coated with, for example, each phosphor emitting red, blue, and green light, first, the phosphor for red is coated in the tank 6 in which the phosphor for red flows. The mask member 3 for attachment is superimposed on the surface, and the display discharge panel to which the negative charge is applied is positioned above the tank 6, so that the positive fluorescent substance 2 is electrostatically attracted to the surface of the negative display discharge panel 4. Painted on. next,
The red mask member is removed from the display discharge panel, and instead a blue mask member is superimposed on the display discharge panel. Is applied. Further, the mask member for blue is removed from the display discharge panel, and the mask member for green is stacked instead. It is to apply the body.

According to the second embodiment, the painting booth required in the first embodiment is not required, so that the work can be performed even in a relatively narrow space, and the powder is not scattered. Therefore, there is no waste of the phosphor used and a suitable working environment can be obtained.

In the above-described embodiment, a case has been described in which a positive charge is applied to the powdery phosphor and a negative charge is applied to the display discharge panel. However, the present invention is not limited to this. However, the opposite charges may be applied.

[0013]

As has been described above in detail, according to the manufacturing method of the display discharge panel of the present invention, each discharge cell of the display discharge panel by utilizing an electrostatic adsorption powdery phosphor containing no Ba Indah , A sufficient amount of phosphor can be applied in each discharge cell, and the mask member needs to be used only once for one kind of phosphor, so that it can be repeatedly used. As a result, the production cost can be reduced, and the original brightness of the phosphor can be obtained without damaging the crystals of the phosphor because a conventional disperser such as a ball mill is not used. In addition, no painting booth is required
Work in a relatively small space
In addition, the work step of baking the applied paste-like phosphor layer at a high temperature to decompose the synthetic resin of the binder component and leave the phosphor, which is conventionally required, is completely unnecessary, and the man-hour is further reduced. Things.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a first embodiment of a method for manufacturing a display discharge panel according to the present invention.

FIG. 2 is an explanatory view showing a second embodiment of the method for manufacturing a display discharge panel according to the present invention.

[Description of Signs] 1 electrostatic powder coating machine 1a nozzle 2 phosphor 3 mask member 4 display discharge panel 5 electrostatic powder coating machine 5a charging net 6 tank

Claims (1)

[Claims] 1. A back substrate in which a plurality of strip-shaped first electrodes are arranged at predetermined intervals and a front substrate in which a plurality of strip-shaped second electrodes are arranged at constant intervals are arranged in the first substrate. In a method of manufacturing a display discharge panel, a first electrode and a second electrode are arranged so as to intersect at a predetermined interval, a discharge cell is formed at the intersection, and a phosphor is formed in the discharge cell. A mask member having a transparent portion corresponding to a portion of the discharge cell on which the phosphor is to be adhered was brought into close contact with the rear substrate and / or the front substrate, and charged using an electrostatic powder coating machine. A method of manufacturing a display discharge panel, comprising: spraying a finely powdered phosphor toward the mask member, and forming the phosphor in a discharge cell corresponding to a transmission portion of the mask member.