JP2593762B2 - Color plasma display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color plasma display panel, and more particularly, to a color plasma display panel in which a phosphor is attached to a partition plate.

[0002]

2. Description of the Related Art A direct current type (DC type) and an alternating current type (AC type) are known as color plasma displays (hereinafter abbreviated as color PDPs).

Various methods are known for the construction of a color PDP. However, in order to make the PDP thin, the periphery of the front glass plate and the back plate facing each other are sealed with a sealing glass to form an airtight container for containing a discharge gas. Is often adopted. Usually, before,
Low cost soda lime glass for windows is used for the back plate.

In a color PDP having a large number of fine and display cells capable of displaying an image, a rectangular cell array in which normal cells and electrodes can be easily formed is employed. In the case of a large number of cells, it is convenient to divide the discharge electrodes into rows and columns, and to form them at the intersections of parallel linear row and column electrode groups.

A color PD having a large number of fine display cells
In P, to prevent erroneous discharge and color bleeding between adjacent cells,
Alternatively, a partition is formed between the front and back plates as a spacer for supporting the pressure difference between the inside and outside of the panel and defining the distance between the electrodes for discharge, and a space surrounded by the partition and the front and back plates. Becomes one display cell.

For forming the partition walls, a thick film technique for printing and firing a dielectric paste such as glass on the back plate has been awarded. Also, Japanese Patent Application Laid-Open Nos. 3-152830, 3-205538, and Japanese Patent Application No. 2-120048 disclose methods using a perforated metal plate. Also,
There is also known a method of etching a thin glass plate.
A combination of these is also possible. The partition plate referred to in the present invention refers to a plate-like plate integrally formed with partition walls for separating a plurality of cells as described above.

A fluorescent substance is adhered to the inner surface of the display cell, and the fluorescent substance emits visible light of each color by ultraviolet rays generated by the discharge. Phosphor adherend surface, a front glass plate facing the display cell, the backplate, is a partition plate surface or the like facing the display cell spaces, is deposited at a distance from the cathode and a position of the discharge. This is indispensable to prevent the phosphor from being deteriorated by positive ions generated by the discharge. These are appropriately used depending on the configuration of the color PDP. For example, D
There are a C type, an AC type, a transmissive type in which light emission is viewed from the back of the phosphor layer, and an opposite reflective type.

The advantages of applying the phosphor also on the surface of the partition plate facing the display cell space are as follows. That is, as compared with the case where the liquid crystal is applied only to the front or rear surface of the display cell, the amount of the liquid applied is large and the luminance can be increased. In the reflection type, the phosphor is attached to the back surface of the display cell, and the field of view is blocked by a partition in the foreground. At this time, a high viewing angle can be achieved if the phosphor is also attached to the surface of the partition plate facing the display cell space .

Conventionally, in a color PDP in which a phosphor is applied to the surface of a partition plate facing the display cell space , the phosphor is used as a display cell.
It is not adhered to the partition wall surface not facing the space . The reason is considered as follows.

[0010] One, because the phosphor layer is white, this is because, if visible from the front glass plate, the contrast the more extra phosphor decreases, the surface on the display cell spaces
This is because the phosphor on the surface of the partition plate that does not face the display cell and does not contribute to light emission is unnecessary.

Another reason is that the adhesion of the phosphor layer is considered to be weak. Solvents and resins often used in phosphor coating are scattered in a subsequent heating step. Also, since the melting point of the phosphor is higher than the normal heat process temperature, the powder has no adhesive force. Therefore, the adhesion of the phosphor layer is weak.
Therefore , during the assembly of the PDP panel,
The phosphor powder on the surface of the partition plate that does not face the display cell space is likely to fall off. For this reason, there is a risk that the dropped phosphor may enter a cell of a different color and mix colors.

In order to improve the adhesion, there is a method of adding a fixing component to the phosphor layer. As a fixing component at high temperature, general glass cannot be used because it contaminates the phosphor when melted. Therefore, conventionally, when a phosphor is applied to the surface of the partition plate facing the display cell space, the partition plate not facing the display cell space is used.
The phosphor deposited on the surface had to be removed.

In order to obtain a high-definition color PDP, one having a small cell pitch is required. However, the larger the partition height, the better for the following reasons. (1) In order to prevent deterioration due to ions, it is necessary to separate the phosphor from the cathode spot. (2) The higher the partition wall , the more phosphors can be deposited. (3) When the discharge electrodes face each other across the partition, the higher the partition, the higher the luminous efficiency. (4) In the case similar to the above (3), the electrode facing the partition forms a capacitor.

In a color PDP, since a large number of electrodes are switched many times, a considerable amount of reactive power is consumed by charging and discharging the capacitor. To reduce power consumption,
It is better to reduce the capacitance of the capacitor. For this, the higher the partition wall which is a dielectric, the better. Therefore, in a color PDP having a small cell pitch, a technique of forming a high partition plate and a technique of attaching a phosphor to the partition plate surface facing the display cell space are important.

However, in the conventional color PDP,
At present, the phosphor is applied only to the surface of the partition plate facing the display cell space, and is not sufficiently used to increase the height of the partition.

[0016]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to provide a color PDP in which partition walls can be easily raised even with high definition.

[0017]

The present inventors have made intensive studies to solve the above-mentioned problems of the prior art, and have reached the present invention.

That is, according to the present invention, a plurality of display cells are formed at positions where a first linear electrode group and a second linear electrode group intersect, and adjacent cell spaces are separated to form a partition wall. In a color PDP using a plate, not only the partition plate surface where the phosphor faces the display cell space but also the display cell
The color PDP is characterized in that it is also attached to the surface of the partition plate not facing the space .

Hereinafter, the present invention will be described more specifically.
As described in the related art, various types of partition plates can be used for the present invention. For example, (1) one in which a dielectric paste such as glass is printed and laminated on a front glass plate to fix a partition, (2) one in which a partition is fixed to a rear plate in the same manner as in the above (1), (3) ) A thin glass plate is formed by etching or plasting, and (4) a perforated metal plate is used. A combination of these is also possible. However, when the number of combinations is large, a high partition wall having a complicated shape can be formed.

The combination of the above (1) and (2) is preferable because the required partition height can be divided into two and the formation is easy. However, there are disadvantages in that the number of times of applying the phosphor increases and the application area of the side wall of the partition decreases.

The holes provided by the above (3) and (4) may be through holes with both sides open, or may have a concave shape on one side. In this case, either the front glass plate or the back plate can be omitted. Also, even if it is a through hole,
It is the same as above if one side is closed. The above selection is determined in consideration of cost, required dimensional accuracy, and the like.

Here, the method of attaching the phosphor will be described. The phosphor is generally used as a white powder. The phosphor powder is applied to the surface to be adhered in the form of slurry or ink. The application method is roll coating, spin coating,
Dipping, spraying and printing can be applied. Pattern formation includes a printing method, a spray method using a mask, and a method in which a photosensitive resin is mixed with a coating material and the coating film is exposed and developed. The printing method is a preferred method because coating and accurate patterning can be performed at the same time, and material consumption is small.

When this simple printing method is applied, it is difficult to uniformly coat the inner surface of the partition wall with a phosphor in a type in which one side is closed as described in (1) to (4) above. . That is, the ink does not reach the bottom surface of the partition wall, or the ink is filled with more ink than necessary, which makes it difficult to control, and particularly difficult to pattern at the bottom surface.

In this case, it is preferable to use a partition plate having the through holes (3) and (4). In other words, since it is easy to print while sucking ink using the through holes or to blow out excess ink immediately after printing, the phosphor can be uniformly applied to the partition plate surface facing the display cell space. Because. Since the shape of the hole on the back side may be small, in a reflective PDP, the smaller the hole, the larger the phosphor attachment area can be. When this hole is used as a window for a back electrode, the bottom surface of the phosphor can be automatically patterned.

The partition plate having the through holes is desirably formed from the perforated metal plate of (4). This partition plate is known as described in the prior art.

Next, main components other than the partition plate used in the color PDP of the present invention will be described. As the front glass plate, soda lime glass for windows is preferable at a low price. Transparent glass of another component can be used, but since there are many thermal bonding steps in addition to cost, it is only necessary to pay attention to thermal expansion compatibility with other materials and heat resistance.

When a rear plate is used, it is selected in consideration of heat resistance, thermal expansion properties, cost, etc., but it is convenient to use the same as the front glass plate.

Since the partition plate is in close contact with the front and rear plates, the coefficient of thermal expansion of the metal should be similar to that of the substrate. When the substrate is soft glass, 42 wt% Ni-6 wt% Cr-Fe alloy or 50 wt% Ni-Fe alloy is used.
wt% Ni-17wt% Co-Fe alloy or 42wt% N
An i-Fe alloy or the like can be preferably exemplified. Further, the above exemplified metals are excellent in heat resistance and heat oxidation resistance,
The dimensional change due to heating up to 00 ° C. is a small amount within the measurement error range. In addition, similar to general metals, these metals have good workability, and when a 0.1 mm metal plate is processed by etching, it is possible to form a display cell with a pitch of 0.15 mm or less. Although finer or more complicated cells can be formed by using a plurality of metal plates, the cost is higher than that of a single sheet. If the above-mentioned etching process is used for a single metal plate, it is possible to easily change the mask pattern on the front and back surfaces and obtain different shapes of the upper and lower holes. Further, since the mechanical properties are good, the operability is good even with a thin material of 0.1 mm or less.

At least a part of the perforated metal plate can be covered with an inorganic dielectric. This is to prevent a short circuit caused by contact with a plurality of electrodes or wiring circuits formed on the substrate. Of course, this is not necessary if a dielectric coating for preventing short circuit is formed on the substrate side. The method of coating the partition plate with a dielectric is described in detail in the above-mentioned patent application and Japanese Patent Application No. 2-270610, and it is preferable to use an inorganic material containing glass which can easily form a dense layer to prevent a short circuit. Circuits such as electrodes and wirings can be formed on the dielectric.

As described above, the partition plate using the perforated metal plate has many excellent characteristics as compared with those made of glass.
As described above, the preferred phosphor deposition method and the partition plate of the present invention have been described, but of course, other methods and other partition plates can be applied.

In the color PDP of the present invention, only the phosphor-coated portion is different, and the others can be used as they are. For example, various color PDPs such as a DC type and an AC type, a transmission type and a reflection type, and many configurations of electrodes and the like are known.

In the present invention, the phosphor faces the display cell space.
On the partition plate surface not facing the display cell space and the partition plate surface not facing the display cell space . Among the problems of the prior art, the improvement of the adhesive force is performed as follows. (1) The scattering of the resin binder used for applying the phosphor is performed after the PDP is assembled. In this case, if the PDP is in a closed state, it is disadvantageous for scattering of the binder. As the resin, a resin having good scattering properties is preferably used in a small amount. Also,
It is preferable to use a partition plate having a through hole. At this time, the state one of the holes that have been released, i.e. good to scatter the resin in the middle of the PDP assembly, face the display cell spaces hole is freed
It is a preferable method that no phosphor is adhered to the surface of the partition plate not to be used.

(2) Partition plate not facing display cell space
A fixing layer is provided on a base portion or an upper portion of the phosphor adhered to the surface. Since the phosphor on the surface of the partition plate that does not face the display cell space does not contribute to light emission, it may be contaminated by the fixed layer, for example, may be contaminated by the penetration of molten glass. When the pinned layer is on top, the phosphor layer and pinned layer are fired simultaneously. This is because a phosphor without a resin binder has a weak adhesive force, and it is difficult to form a fixing layer thereon.

(3) Water glass is used as a fixing component. The water glass can exhibit fixation by blowing off moisture. Since this operation is performed at a low temperature, the phosphor is not deteriorated by heat. In addition, since the melting point of the solidified water glass is high, the phosphor is not deteriorated at the temperature of the PDP production process. Further, since the solidified film of the water glass allows ultraviolet rays to pass well, if the amount used is small and the film is thin, Does not interfere with light emission. Although the fixing force of the appropriate amount of water glass is not so strong, it is enough to prevent the phosphor from falling off during the PDP assembling operation. As described above, the adhesion of the phosphor can be improved by appropriately selecting or combining the three methods.

Next, the deposition of the phosphor will be described. Conventional deposition techniques can be applied. There is a color PDP with one kind of phosphor, and fine patterning is not required, and deposition is easy, but display is limited to one color. There is a single layer of the phosphor layer to be deposited on the surface of the partition plate. A plurality of phosphors are used for multicolor display. Three primary colors of red (R), green (G), and blue (B) are often used, and phosphors of different colors are separately applied to adjacent cells due to juxtaposition and mixing. At this time, the phosphor layers of two colors can be overlaid on the surface of the partition plate not facing the display cell space . The overlapping part is in the display cell space so that the phosphor does not enter the display cells of different colors.
It is good to keep it at a part of the center of the partition wall surface that does not face the surface .

The phosphor on the surface of the partition plate not facing the display cell space substantially increases the partition height. Therefore, the design of the partition plate height can be reduced, and the formation can be facilitated.

The phosphor used for the color PDP is usually an insulator. Therefore, even if the phosphor is on the surface of the partition plate or different phosphors are overlapped, it may be used for the wiring formed on the front and rear plates. Has no problem. Even if the partition plate is conductive, this phosphor insulating layer has the effect of preventing short-circuiting of wiring and the like. Further, the following effect is also obtained.

That is, when the discharge electrodes are formed so as to sandwich the partition plate, these constitute a capacitor. If a phosphor, which is a dielectric, is added between them, the capacitance of the capacitor becomes smaller. Since the deposited phosphor layer has a structure in which the powders are overlapped with each other, the whole dielectric constant is smaller than that when only the phosphor is used. Therefore, it is convenient to reduce the capacitance of the capacitor. Further, the phosphor layer has the above-mentioned structure, and is soft only by the contact of the powder. Therefore, when the partition plate and the front and rear plates are assembled, they can be sufficiently adhered to each other even if their parallelism does not slightly match, and there is no danger of damaging the glass substrate even if the thermal expansion is slightly different. .

In order to prevent a decrease in contrast due to the phosphor attached to the surface of the partition plate not facing the display cell space, it is necessary to use
What is necessary is just to form a dark colored layer on the front side of the phosphor thus obtained .
If the light-shielding property is there in the partition wall itself, there is no need to provide a colored layer on the back side of the phosphor. It is desirable that the coloring layer and the phosphor layer are close to each other. If they are far apart, the light-shielding property is deteriorated depending on the viewing angle, and light is also shielded to a necessary portion. Therefore, it is preferable that the colored layer is formed in close contact with the upper surface or the lower surface of the deposited phosphor layer on the front surface side.

The coloring layer is preferably formed of an inorganic dielectric for the same reason as described for the phosphor coating, because there is no danger of short circuit. In addition, the colored layer substantially increases the height of the partition walls, and when the discharge electrodes are opposed to each other with the partition plate interposed therebetween, reduces the capacitance of the capacitor if it is a dielectric material. When a simple printing method is used for applying the colored layer, powder may be used as the material. As the constituent material of the coloring layer, conductive particles and the like can be used as long as the conductivity does not increase as a whole. For example, it is a powder of metal or carbon. Many colored inorganic dielectrics are known. Transition metal, for example,
Preferable examples include single or composite oxides of Fe, Ni, Co, Mn, Cr, Ti and the like. Further, an oxide-based glass containing the above element is also suitable.

It is also preferable that the coloring layer contains a fixing component such as glass. This fixing material not only strengthens the colored layer but also penetrates into the phosphor layer by the heat of the color PDP forming process, and can improve the adhesion of the phosphor layer. As such coloring materials, those known as pigments for painting glass or ceramics or for coloring ceramics are used.

As the method for applying the colored layer, those described for the phosphor can be widely applied. The partition plate is usually formed in a flat plate shape, and the phosphor layer formed on the surface thereof is the outermost surface. Therefore, the following method is also convenient. (1) A colored layer having an appropriate thickness is formed on a flat substrate, a partition plate is pressed against the colored layer, and the colored layer is transferred onto the surface phosphor layer. (2) A colored layer having an appropriate thickness is formed on a roll-shaped cylindrical substrate, and the roll is pressed against a partition plate to transfer the colored layer onto the surface phosphor layer.

As the coloring layer, an undried ink can be used. Since the phosphor layer to be applied is porous, it absorbs ink well. Further, as is well known, even a solid colored layer can be made to have heat-sensitive or pressure-sensitive adhesiveness, and if the substrate is given releasability, it can be transferred well.

[0044]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. Note that the reference numerals used in the drawings used below are common, and the same reference numerals indicate the same components. In addition, in the following examples, those which are not described used a known technique.

Embodiment 1 FIG. 1 is a partial schematic sectional view showing an example of a color PDP. A colored layer 5 corresponding to the shape of the partition wall 3 was formed on the front glass plate 1 by vapor deposition and etching of Cr. Using the colored layer 5 as a mask, the glass plate was etched to form the partition and a part of the cell space. As a whole, one front partition plate 31 is formed. The display area of this partition plate
The phosphor layer 4 made white by mixing phosphor powders of three colors of R, G, and B was applied to the surface facing the cell space and the surface not facing the display cell space . For deposition, a slurry was prepared by mixing appropriate amounts of phosphor powder, water glass and water, and a slurry was sprayed. Using a glass plate as the back plate 2,
An AC type circuit was formed thereon (not shown). Further, a dielectric ink was printed many times thereon to form partition walls. As a whole, one rear partition plate 32 is formed. The front and rear partition plates were combined at predetermined positions to produce an AC-type transmissive color PDP.

This PDP is formed by adding a coloring layer and a display cell space.
Conventional PD with no phosphor layer on the surface of the front partition plate that does not face
Compared with P, the cell space can be increased by the amount of the coloring layer and the phosphor layer. Further, it is possible to save time and effort for peeling off the phosphor adhered to the partition plate surface. Further, since the coloring layer is on the front side, there is no reduction in contrast.

Embodiment 2 FIG. 2 is a partial schematic sectional view showing another example of a color PDP. A cathode (not shown) is provided on a front glass plate 1 and a back plate 2
Was formed with an anode (not shown). The intermediate partition plate 33 is
Made from perforated metal plate. The metal plate was etched to form a through-hole on the front side larger than the back side as shown in FIG.
This surface is covered with a dielectric containing glass.

A phosphor layer was screen-printed on the partition plate as shown in FIG. The ink is obtained by kneading a phosphor powder and a liquid vehicle in which ethyl cellulose resin is dissolved in butyl carbitol acetate. Printing was performed from the front side, and at this time, excess ink was sucked from the holes on the back side. The phosphor printing was performed three times in the order of R, G, and B, and a phosphor layer was applied as shown in FIG. Adjacent the phosphor layer, the display cell
At the center of the front side surface of the partition plate that does not face the space . A small amount of phosphor adhered to the surface of the partition plate facing the through hole on the back side was left as it was.

Here, a plate was prepared by applying a colored ink on a flat plate. The ink is obtained by kneading oxide coloring powders of Fe, Co, Mn, and Cr, glass powder having a low melting point, and the same liquid vehicle as described above. On this, the front side of the partition plate was pressed to apply a colored layer. The partition plate was placed at a predetermined position on the back plate, and the periphery was fixed with low-melting fixed glass. At this time, it was baked at 540 ° C. to melt the fixed glass and to scatter the liquid vehicle in the ink. At the same time, the glass in the colored layer also melts and diffuses into the phosphor layer to strengthen the whole. The combined back plate and partition plate were combined at predetermined positions on the front plate to produce a DC-type reflective PDP.

This PDP is formed by adding a colored layer and a display cell space.
As compared with a conventional PDP in which a phosphor layer is not provided on the surface of a partition plate that does not face the above, the cell space can be increased by the amount of the coloring layer and the three phosphor layers. Therefore, the capacity of the capacitor can be reduced. In addition, it is possible to eliminate the trouble of peeling off the fluorescent substance to be adhered on the surface of the partition plate not facing the display cell space . Further, since the colored layer is on the front side, there is no decrease in contrast or the like.

As can be seen from the above embodiments, in the color PDP of the present invention, the phosphor is also applied to the surface of the partition plate which does not face the display cell space, and a colored layer is formed at a necessary portion. Except for this, the configuration is the same as that of a general configuration, and various configurations can be applied.

[0052]

According to the present invention, the following effects can be obtained. (1) It is not necessary to remove the phosphor adhering to the partition plate surface not facing the display cell space . (2) The cell space can be designed high, and the characteristics can be improved. (3) The height of the partition wall itself can be reduced, which facilitates fabrication. (4) When the discharge electrodes face each other with the partition wall interposed therebetween, the capacitance of the capacitor can be reduced. (5) If a perforated metal plate is used for forming the partition plate, a color PDP with a fine pitch can be obtained. (6) There is no decrease in contrast. (7) No special new technology is required, making it easy to create.

[Brief description of the drawings]

FIG. 1 is a partial schematic cross-sectional view showing an example of a PDP of the present invention.

FIG. 2 is a partial schematic sectional view showing another example of the PDP of the present invention.

[Explanation of symbols]

1: front glass plate, 2: rear plate, 3: partition wall, 3
1: front partition plate, 32: rear partition plate, 33: intermediate partition plate, 4: phosphor layer, 5: colored layer.

Claims (5)

(57) [Claims] A plurality of display cells are formed at positions where a first linear electrode group and a second linear electrode group intersect, and a partition plate for separating adjacent cell spaces and forming a partition portion is used. In a color plasma display panel, the phosphor is not only displayed on the partition plate surface facing the display cell
A color plasma display panel, which is also attached to the surface of a partition plate not facing a cell space . 2. A method according to claim 1, wherein the plurality of cells have phosphors corresponding to a plurality of colors, and phosphors of adjacent colors are displayed.
2. The color plasma display panel according to claim 1, wherein the color plasma display panel is superimposed on a surface of the partition plate not facing the cell space . 3. The dark colored layer is formed close to the front side of the phosphor when the phosphor on the surface of the partition plate not facing the display cell space is seen from the front side. The color plasma display panel according to the above. 4. The color plasma display panel according to claim 3, wherein the coloring layer is made of an inorganic dielectric. 5. The color plasma display panel according to claim 1, wherein said partition plate is formed from a perforated metal plate.