JP2001357784A - Surface discharge display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent occurrence of lighting failure and reduce power consumption upon sustaining discharging. SOLUTION: A first dielectric layer 1051 covering a display electrode 103 and a display scanning electrode 104 is formed, and at the same time, a second dielectric layer 1052 having a dielectric constant lower than the first dielectric layer 1051 is formed in a region surrounded by the display electrode 103, the display scanning electrode 104 and a front glass substrate 101. A wall charge necessary for sustaining discharging can be formed by the first dielectric layer 1051, and relative dielectric constant between the display electrode 103 and the display scanning electrode 104 can be reduced by the second dielectric layer 1052, whereby the power consumption upon sustaining discharging can be reduced while restraining lighting failure.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface discharge type display device used for image display and the like, and more particularly to a dielectric material thereof.

[0002]

2. Description of the Related Art In recent years, in a color display device used for image display such as a computer or a television, a plasma addressed liquid crystal or a plasma display panel (Pl.
asma Display Panel, hereinafter referred to as “PDP”. ) Is attracting attention as a color display device capable of realizing a large and thin panel, and its practical application is particularly expected in PDPs.

FIG. 24 is a partial cross-sectional perspective view of a conventional general PDP, and FIG. 25 is a partially enlarged cross-sectional view of the PDP of FIG. 24 viewed from the x-axis direction. As shown in FIG.
In the PDP, a front glass substrate 11 and a rear glass substrate 12 are arranged to face each other in parallel via a partition wall 19.
On the facing surface of the front glass substrate 11, a plurality of display electrodes 13 and display scan electrodes 14 (only two are shown in the figure. The width × thickness is about 100 μm).
mx 5 μm. ) Are alternately arranged in parallel in a stripe pattern. As shown in FIG. 25, a dielectric layer 15 made of, for example, lead glass is coated on the surface of the front glass substrate 11 on which the electrodes 13 and 14 are disposed to insulate the electrodes. Is coated with an MgO protective film 16.

On the other hand, address electrodes 17 arranged in stripes and a dielectric layer 18 made of lead glass or the like are formed on the opposing surface of the rear glass substrate 12 so as to cover the surface thereof. As shown, a partition wall 19 is formed adjacent to the address electrode 17. Further, red (R), green (G), and blue (B) phosphor layers 20R, 20G, and 20B are formed in the concave portions between the adjacent partition walls 19.

With the above arrangement, in the discharge space 21 filled with the inert gas between the front glass substrate 11 and the rear glass substrate 12, each of the electrodes 13, 14 and the address electrode 1
A cell serving as a unit light-emitting area is formed at the intersection of 7. When an image is displayed on the PDP, in the corresponding cell in the discharge space 21, discharge is performed by applying a voltage equal to or higher than the discharge start voltage between the display scan electrode 14 and the address electrode 17, thereby discharging the inner wall of the MgO protective film 16. After the wall charges are formed, a pulse voltage is applied to the display electrodes 13 and the display scan electrodes 14 arranged in the same plane, so that a sustain discharge is generated in the plane of the cells where the wall charges are formed. The ultraviolet light generated at that time is reflected by the phosphors 20R of each color.
By exciting G and B, visible light of three primary colors of red, green and blue is generated, and full-color display can be performed by additively mixing these colors.

[0006]

It is known that the amount of current flowing during the sustain discharge depends on the capacitance of the dielectric layer 15. The dielectric layer 15 made of generally used lead glass has a relative dielectric constant of 9
Since the capacitance is as large as １２12 and the capacitance is large, the amount of current flowing during the sustain discharge increases. Therefore, there is a problem that the power consumption of the panel is increased.

In response to such a problem, the relative dielectric constant is set to 8
Technology for forming a dielectric layer with the following materials (Japanese Patent Laid-Open No. 8-77)
No. 930). According to this, since the dielectric constant of the dielectric layer is reduced, the amount of current during sustain discharge is reduced, and the power consumption of the panel is suppressed. However, when the relative dielectric constant is reduced, the capacitance is also reduced, so that the wall charges of the cells to be lighted are not sufficiently formed, and accordingly, the cells that do not emit light without sustain discharge (hereinafter referred to as lighting failure). Can occur. The above-described problem may occur not only in the PDP but also in a surface discharge type display device such as a plasma addressed liquid crystal using the same surface discharge.

An object of the present invention is to provide a surface discharge type display device capable of suppressing power consumption without causing lighting failure.

[0009]

To achieve the above object, the present invention provides a first panel in which a plurality of pairs of electrodes are arranged in a row on one main surface of a substrate, and a plurality of electrodes on the substrate. A first panel and a second panel disposed in parallel and opposed via a partition so that the electrode and the electrode pair of the first panel are opposed to each other. In a surface discharge type display device in which a discharge gas is sealed in a discharge space formed between a first panel and the second panel via a partition wall, and an image is displayed by utilizing a surface discharge performed between the pair of electrodes. The electrode pair is covered with a first dielectric layer, and the first dielectric layer is formed in a region surrounded by the electrode and the electrode of the electrode pair and the substrate of the first panel. So that a region with a lower dielectric constant than that of It was.

[0010] Thus, wall charges can be stored in the first dielectric layer. On the other hand, since the relative dielectric constant between the electrodes of the electrode pair can be reduced, the amount of current during sustain discharge can be suppressed. Therefore, it is possible to suppress the power consumption of the panel while suppressing the lighting failure. Specifically, in order to form a region having a lower dielectric constant than the first dielectric layer, a second dielectric layer having a lower dielectric constant than the first dielectric layer is formed between the electrode pairs. It should just be arranged.
As a method of forming the second dielectric layer, a metal mask method or a nozzle injection method can be used.

A groove is formed on the surface of the first dielectric layer between the electrodes of the electrode pair, the groove being formed on the side of the first panel, and the groove is formed in a direction perpendicular to the substrate from the bottom of the groove to the substrate of the first panel. May be shorter than the farthest distance between the electrode and the surface. By doing so, 1 at the groove portion
Since the discharge gas having a low relative dielectric constant is filled, the power consumption of the panel can be further reduced. here,
The groove may be a depression. As a method of forming such grooves and depressions, a sand blast method or a dielectric paste method can be used.

Further, if the aspect ratio, which is the ratio between the thickness and the width of the electrode pair, is set to 0.07 or more and 2.0 or less, the discharge space can be widened and the aperture ratio of the panel can be increased. Luminous efficiency can be improved. As described above, the surface discharge type display device of the present invention can suppress the power consumption of the panel while suppressing the lighting failure during the sustain discharge.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A case where the present invention is applied to a PDP will be described below as an example of an embodiment of a surface discharge type display device according to the present invention. [First Embodiment] PDP and PDP according to the present invention
A first embodiment of a display device will be described with reference to the drawings.

<Configuration of PDP 100> FIG.
FIG. 2 is a schematic plan view of the PDP 100 with the front glass substrate 101 removed, and FIG. In FIG. 1, the numbers of the display electrodes 103, the display scan electrodes 104, and the address electrodes 108 are partially omitted for easy understanding. The structure of the PDP 100 will be described with reference to FIGS.

As shown in FIG. 1, a PDP 100 includes a front glass substrate 101 (not shown), a rear glass substrate 102,
n display electrodes 103, n display scan electrodes 10
4, m address electrodes 108 and a hermetic seal layer 121 indicated by oblique lines.
Reference numeral 08 forms an electrode matrix having a three-electrode structure, and cells are formed at intersections between the display electrodes 103 and the display scan electrodes 104 and the address electrodes 108.

This PDP 100 is, as shown in FIG.
A front glass substrate 101 as a front panel and a rear glass substrate 102 as a rear panel are arranged in parallel with each other via partition walls 110 arranged in a stripe pattern. The front panel is a front glass substrate 1
01, a display electrode 103, a display scan electrode 104, a dielectric layer 105, and a protective film 106 are provided on one main surface.

Display electrode 103 and display scan electrode 1
Reference numeral 04 denotes electrodes arranged alternately and in parallel on the front glass substrate 101 in a stripe shape, both of which are made of silver or the like. The dielectric layer 105 is formed on the front glass substrate 10.
1 and each of the electrodes 103 and 104 is a layer made of lead glass or the like.

The protective film 106 is formed on the surface of the dielectric layer 105 and is a layer made of magnesium oxide (MgO) or the like. On the other hand, on the back panel, an address electrode 108, a visible light reflection layer 109, a partition 110, and phosphor layers 111R, G, and B are arranged on one main surface of the back glass substrate 102.

The address electrode 108 is formed on the back glass substrate 1
The electrodes are arranged in parallel on the electrode 02 and are made of silver or the like. The visible light reflecting layer 109 is formed so as to cover the address electrode 108, and is, for example, a layer made of dielectric glass containing titanium oxide.
It has a function of reflecting visible light generated by R, G, and B, and a function as a dielectric layer.

The partition walls 110 are arranged on the surface of the visible light reflecting layer 109 in parallel with the address electrodes 108. Each of the phosphor layers 111R, G, and B is sequentially formed in the recess between the partition walls 110 and the side wall of the partition wall 110. The phosphor layers 111R, 111G, and 111B are layers to which phosphor particles emitting red (R), green (G), and blue (B) are respectively bonded.

In the PDP 100, the front panel and the rear panel are adhered to each other, the periphery of the panel is sealed by an airtight seal layer 121, and a discharge gas (eg, 95 vol.
% And a mixed gas of 5 vol% of xenon) at a predetermined pressure (for example, about 66.5 kPa).

The PDP 100 has a PDP as shown in FIG.
PDP display device 160 connected to DP driving device 150
Is composed. When the PDP display device 160 is driven, the display driver circuit 153, the display scan driver circuit 154, and the address driver circuit 155 are connected to the PDP 100 as shown in FIG. The address discharge is performed between the display scan electrode 104 and the address scan electrode 104 by applying a voltage equal to or higher than the discharge start voltage to the electrodes to accumulate wall charges. By applying a pulse voltage, a sustain discharge is performed in a cell in which wall charges are accumulated. Ultraviolet rays are generated from the discharge gas at the time of the sustain discharge, and the phosphor layer excited by the ultraviolet rays emits light to turn on the cell. An image is displayed by a combination of lighting and non-lighting of each color cell.

<Structure of Front Panel> Next, the structure of the front panel characteristic of the PDP according to the present invention will be described.
FIG. 4 is a partially enlarged cross-sectional view of the PDP in FIG. 2 viewed from the x-axis direction. As shown in FIG.
Is composed of a first dielectric layer 1051 covering the entire surface of the front glass substrate 101 and a second dielectric layer 1052 disposed in the gap between the electrodes 103 and 104.

The first dielectric layer 1051 is made of, for example, PbO (75 wt%), B
It is composed of a lead-based dielectric (relative permittivity = about 11) containing ₂ O ₃ (15 wt%) and SiO ₂ (10 wt%), and has a display electrode 103, a display scan electrode 104, and a second dielectric layer. 1052 is formed so as to cover the surface. The surface of the first dielectric layer 1051 is covered with a protective film 106 made of, for example, MgO.

The second dielectric layer 1052 is formed on the display electrode 103
It is formed so as to fill all the gaps between the electrodes 103 and 104 and the thickness W2 is equal to or larger than the larger one of the thicknesses W1 and 3 of the electrodes 103 and 104. The second dielectric layer 1052 is formed by the first dielectric layer 1052.
It is made of a material having a lower relative dielectric constant than the dielectric layer 1051, for example, Na ₂ O (65 wt%), B ₂ O ₃ (20
wt.) and a dielectric material having a relative dielectric constant of about 6.5, such as a sodium-based dielectric containing ZnO (15 wt.%).

<Effect of Providing Second Dielectric Layer 1052> As described above, the second dielectric layer 1052 having a lower relative dielectric constant than the first dielectric layer 1051 is formed by each of the electrodes 103 and 10.
4 so that the distance between the display electrode 103 and the display scan electrode 104, that is, the point farthest in the z-axis direction from the front glass substrate 101 of the display electrode 103 and the display scan electrode 104, is formed. In the region surrounded by the electrodes 103 and 104 on the front glass substrate 101 side and the front glass substrate 101, a region having a lower relative dielectric constant than the first dielectric layer 1051 is formed. Therefore, the display electrode 103 and the display scan electrode 1
04 can be reduced.

On the other hand, the surfaces of the display electrode 103 and the display scan electrode 104 are formed on the first dielectric layer 10 having a high relative dielectric constant.
Since it is covered with 51, the formation of wall charges by the address discharge performed with the address electrode 108 is also performed favorably. Therefore, there is little possibility that a lighting failure occurs. Therefore, as compared with the conventional case where the dielectric layer is uniformly formed on the substrate surface, the amount of current flowing during the sustain discharge can be suppressed without causing lighting failure. Therefore, it is considered that the power consumption of the panel is lower than that of the related art.

The second dielectric layer 1052 is preferably formed entirely between the display electrode 103 and the display scan electrode 104. However, even in the case where W2 <W1,3, each electrode 103, Since the capacitance between the electrodes 104 decreases, the power consumption of the panel is suppressed. <Method of Manufacturing PDP 100> Next, the above-described PDP 10
0, first, an example of a method of manufacturing the front panel will be described with reference to FIG. FIGS. 5 (1) to 5 (6)
FIG. 14 is a partially enlarged cross-sectional view of the front panel in each manufacturing process when the second dielectric layer 1052 is formed by using a metal mask method as viewed from the x-axis direction, and the process proceeds in numerical order.

Fabrication of Front Panel The front panel is formed on a front glass substrate 101 by first providing n display electrodes 103 and display scan electrodes 104 (FIG. 5).
, Only one of each is displayed. ) Are alternately and parallelly formed in stripes, and the dielectric layer 105 is formed thereon.
, And a protective film 106 is formed on the surface.

Display electrode 103 and display scan electrode 1
Reference numeral 04 denotes an electrode made of, for example, silver, and a silver paste for the electrode (for example, NP-4028 manufactured by Noritake)
At a predetermined interval d1 (about 80 μm) by screen printing
5 (1)
It is formed as follows. Next, a second dielectric layer 1052 is formed using a metal mask method.

As shown in FIG. 5B, the second dielectric layer 1
052 at the position corresponding to the position where
Metal plate 20 having (a hole long in the direction perpendicular to the paper surface)
1 is arranged such that its long hole 2011 is located between the electrodes 103 and 104. Here, the metal plate 20
Forming 1 and front glass substrate 101 in the same size facilitates the positioning operation.

Then, a paste 202 containing a sodium-based dielectric material is applied on a metal plate, and by moving a squeegee 2010, the paste 202 discharged from the long hole 2011 is applied on a panel. The width d2 of the long hole 2011 is slightly smaller than the width d1 between the display electrode 103 and the display scan electrode 104 (for example, 60 μm).
This makes it possible to adapt to a case where the arrangement position of the metal plate 201 is slightly shifted or a pitch shift occurs between the electrodes 103 and 104. As the paste 202, for example, Na ₂ O (65 wt.
%), B ₂ O ₃ (20 wt%), a mixture of ZnO (15 wt%) and an organic binder (10% ethyl cellulose dissolved in α-terpinel) is used. Here, the organic binder is obtained by dissolving a resin in an organic solvent. For example, an acrylic resin may be used as a resin other than ethyl cellulose, and butyl carbitol may be used as an organic solvent. Further, a dispersant (for example, glycerol trioleate) may be mixed in such an organic binder.

After the paste 202 is applied as shown in FIG. 5 (3), the panel is baked at a predetermined temperature for a predetermined time (for example, at 560 ° C. for 20 minutes) to burn off the organic binder, and FIG. 5 (4) As shown in FIG.
2 is formed to have a predetermined layer thickness (about 20 μm). A paste containing a lead-based glass material is applied on the surface of the second dielectric layer 1052 thus formed by screen printing, and then dried and fired.
The first dielectric layer 1051 as shown in FIG.

Finally, as shown in FIG. 5 (6), a protective film 106 is coated on the surface of the first dielectric layer 1051. The protective film 106 is made of, for example, magnesium oxide (MgO), and can be formed to have a predetermined thickness (about 0.5 μm) by a sputtering method, a CVD method (chemical vapor deposition method), or the like. Note that the second dielectric layer 1052 is formed using a metal mask method, but is not limited to this method, and may be formed using a nozzle injection method or the like.

FIG. 6 is a diagram showing a method of forming a front panel by a nozzle injection method. Except for FIG. 6 (2), FIG.
Since these figures are the same as those shown in FIG. As shown in FIG. 6B, in the nozzle injection method, a paste injection device 2020 is used.

The paste injection device 2020 has a nozzle diameter d
3 nozzle holes 2021 and a moving table (not shown),
Paste 202 supplied from a paste supply device (not shown)
While the front glass substrate 101 and the paste injecting device 2020 are relatively moved in the direction perpendicular to the paper surface (x-axis direction) by a moving table while discharging the liquid from the nozzle holes 2021, between the display electrode 103 and the display scan electrode 104. The paste 202 is applied. Here, the nozzle hole 2021
Is slightly smaller than the width d1 between the display electrode 103 and the display scan electrode 104 (for example, 60 μm).
m), it is possible to adapt even when the arrangement position of the paste injecting device 2020 is slightly shifted or a pitch shift occurs between the electrodes 103 and 104.

Next, an example of a method of manufacturing a rear panel will be described with reference to FIGS.
This will be described with reference to FIG. The back panel is formed by first screen printing and baking a silver paste for an electrode on a back glass substrate 102, thereby forming m address electrodes 10
8 are formed in a line. A visible light reflecting layer 109 is formed thereon by applying a paste containing a lead-based glass material by using a screen printing method. afterwards,
Similarly, the partition 110 is formed by repeatedly applying a paste containing a lead-based glass material at a predetermined pitch by a screen printing method and then firing the paste. The partition 110 divides the discharge space 122 into cells (unit light emitting regions) in the x-axis direction.

A paste-like phosphor ink composed of red (R), green (G), and blue (B) phosphor particles and an organic binder is applied to the grooves between the partitions 110. I do. This is fired at a temperature of 400 to 590 ° C. to burn off the organic binder, so that the phosphor layers 111R, 111G, and 11 formed by binding the respective phosphor particles are formed.
1B is formed.

Production of PDP by Panel Bonding The front panel and the rear panel produced in this manner are:
Each electrode of the front panel and the address electrode of the rear panel are overlapped so as to be orthogonal to each other, and a sealing glass is inserted around the periphery of the panel, which is baked at, for example, about 450 ° C. for 10 to 20 minutes to form an airtight sealing layer. It is sealed by forming 121 (FIG. 1). After the inside of the discharge space 122 is once evacuated to a high vacuum (for example, 1.1 × 10 ⁻⁴ Pa), a discharge gas (for example, a He—Xe system, Ne
-Xe-based inert gas) is sealed at a predetermined pressure to manufacture the PDP 100.

<Regarding Phosphor Ink and Phosphor Particles> The phosphor ink applied to the rear panel is prepared by mixing phosphor particles of each color, a binder, and a solvent and blending the mixture so as to be 15 to 3000 centipoise. Yes, if necessary, surfactant, silica, dispersant (0.1-5 wt.
%) May be added.

As the phosphor particles to be prepared in the phosphor ink, commonly used phosphor particles are used. For example, as red phosphor particles, (Y, Gd) BO ₃ : E
u and a compound represented by Y ₂ O ₃ : Eu are used. These are compounds in which a part of the Y element constituting the base material is replaced by Eu. As a green phosphor,
Compounds represented by BaAl ₁₂ O ₁₉ : Mn and Zn ₂ SiO ₄ : Mn are used. These phosphors are compounds in which elements constituting the base material are partially substituted with Mn.

As the blue phosphor, BaMgAl
Compounds represented by ₁₀ O ₁₇ : Eu and BaMgAl ₁₄ O ₂₃ : Eu are used. These phosphors are compounds in which a part of the Ba element constituting the base material is replaced by Eu. Examples of the binder to be mixed with the phosphor ink include ethyl cellulose and acrylic resin (0.
1 to 10 wt%), and α-terpineol and butyl carbitol can be used as the solvent. In addition, PMA or PV is used as a binder.
As a solvent for a polymer such as A, an organic solvent such as diethylene glycol or methyl ether or water can be used.

<Modification of First Embodiment> In the first embodiment, the first dielectric layer 10
51 is formed so as to cover all the surfaces of the display electrode 103, the display scan electrode 104, and the second dielectric layer 1052, but the first dielectric layer is basically formed on the surface of the display electrode 103 and the display scan electrode 104. Just cover the
The surface of the second dielectric layer may be discontinuous.

FIG. 7 is a partially enlarged cross-sectional view of the front panel according to this modification. The components having the same reference numerals as those in FIG. 4 have the same configuration, and a description thereof will be omitted. FIG.
As shown in FIG. 7, the front panel according to the present modification has a structure in which the first dielectric layer has a first dielectric layer 1051a on the display electrode 103 side.
And the first dielectric layer 1051 on the display scan electrode 104 side
b, thereby separating the second dielectric layer 10
A groove 300 is formed on 52.

Since the groove 300 is filled with a discharge gas having a relative dielectric constant of about 1, the display electrodes 103 and the display scan electrodes 10 are formed as compared with the case where the second dielectric layer is formed.
It is considered that the capacitance during the period 4 decreases and the amount of current flowing during the sustain discharge can be further suppressed. Further, as shown in FIG. 8, the first dielectric layer 1051c and d is provided between the electrodes 103 and 104 via the first dielectric layers 1051c and d so as to cover the display electrodes 103 and the display scan electrodes 104. A second dielectric layer 1053 having a lower dielectric constant than the layers 1051c and 1051d may be provided.

With such a configuration, the first dielectric layers 1051c and 1051d having a high relative dielectric constant are formed on the display electrode 103.
And the display scan electrode 104, the capacitance is increased as compared with the first embodiment, and the effect of suppressing power consumption is deteriorated. It is considered that the capacitance is reduced and the effect of suppressing power consumption is excellent.

(Example 1) (Example samples 1 and 2) A PDP sample in which a front panel of a PDP was provided in a form as shown in FIG. 4 was manufactured. Here, Na ₂ O—B ₂ O ₃ —ZnO (relative dielectric constant: 6.5) was used for the second dielectric layer and was formed by a metal mask method (No. 1), and the material was alkoxy. A product (No. 2) formed by a nozzle injection method using silane (OCD T-7, manufactured by Tokyo Ohka Co., Ltd., relative dielectric constant: 4) was produced.

(Example Samples 3 to 5) Samples were prepared in which the front panel of the PDP was provided in the form shown in FIG.
Here, the material of the second dielectric layer is Na ₂ O—B ₂ O ₃ −
A coating (No. 3) formed by applying, drying, and firing by ZnO (relative dielectric constant: 6.5) by a metal mask method;
A coating (No. 4) formed by coating, drying and firing by a nozzle injection method, and a material for the second dielectric layer, alkoxysilane (OCD T-7 manufactured by Tokyo Ohka Co.,
Using (4), coating and drying were repeated three times by a nozzle injection method, followed by baking at 500 ° C. for 30 minutes (N
o. 5) was produced.

(Example Samples 6 and 7) Samples were prepared in which the front panel of the PDP was provided in the form shown in FIG.
Here, the material of the second dielectric layer is Na ₂ O—B ₂ O ₃ −
One formed by a metal mask method using ZnO (relative permittivity: 6.5) (No. 6), and alkoxysilane (OCD T-7 manufactured by Tokyo Ohkasha, relative permittivity:
No. 4) and formed by a nozzle injection method (No. 4).
(Comparative Sample 8) A comparative sample (No. 8) in which the front panel of the PDP was provided in the form as shown in FIG.

Here, each of the PDP sample Nos. 1 to
In No. 8, an electrode having a size of 200 mm × 300 mm was manufactured, and NP-4028 manufactured by Noritake Co., Ltd. was used as a silver paste for forming a display electrode and a display scan electrode, and the electrodes were formed to have a film thickness of 5 μm and a width of 80 μm. Created. The thickness of the second dielectric layer was 4 for each sample.
0 μm, and the thickness of the MgO protective film was 0.5 μm.
In addition, as a discharge gas, a mixed gas of 95 vol% of neon and 5 vol% of xenon was used and sealed so as to have a pressure of 66.5 kPa.

<Experiment 1> Experimental method: Sample No. 1 to 7 and Comparative Example Sample Nos. 8 was connected to a PDP driving device having the same configuration, and the sustain discharge voltage, relative luminous efficiency, and input power during driving of the PDP were measured. At this time, the input waveform to the display electrode and the display scan electrode is 10
A rectangular wave having a kHz and a duty ratio of 10% was used.

Results and discussion: Table 1 shows the experimental results.

[0053]

[Table 1] As can be seen from this table, Comparative Example Sample No. In the case of 8, an electric power of 66 W is required, and the relative luminous efficiency in that case is also 0.60 (lm / W). On the other hand, in each example sample No. In each of Nos. 1 to 7, the power consumption is 66 W or less, which indicates that the power consumption can be suppressed by about 10% or more as compared with the related art. In addition, since the power consumption can be suppressed in this manner, the relative luminous efficiency is also 0.61 (lm / m).
It can be seen that w) is improved. In addition, no lighting failure was observed.

From the above results, the first dielectric layer is provided so as to cover the display electrode and the display scan electrode, and the second dielectric layer having a lower relative dielectric constant than the first dielectric layer is referred to as the display electrode. By providing between the scan electrodes, wall charges are formed by the first dielectric layer having a high relative dielectric constant,
Since the relative dielectric constant between the display electrode and the display scan electrode can be reduced by the second dielectric layer having a low relative dielectric constant, power consumption during sustain discharge can be suppressed without causing lighting failure. .

[Second Embodiment] Next, a PDP according to a second embodiment of the present invention will be described with reference to the drawings. Note that the PDP in the second embodiment is
The first embodiment has substantially the same configuration as that of the PDP described with reference to FIGS. 1 to 3 except that the configuration of the front panel is different.

FIG. 9 shows a PDP according to the second embodiment.
2 shows a partially enlarged sectional view of FIG. As shown in the drawing, in the PDP according to the second embodiment, the dielectric layer 20 is formed so as to cover the display electrode 103 and the display scan electrode 104.
5 is formed, and the surface of the dielectric layer 205 is dented between the electrodes 103 and 104;
A groove 207 extending in a direction along the electrode is provided.

The dielectric layer 205 has the same composition as the first dielectric layer 1051 in the first embodiment, and has a relative dielectric constant of about 11. The entire surface of the dielectric layer 205 is covered with a protective film 206 made of MgO or the like. The groove 207 is provided between the display electrode 103 and the display scan electrode 104 in the dielectric layer 205 with substantially the same length as each electrode, and the thickness W4 of the dielectric layer 205 at the bottom of the groove 207 is equal to the thickness of the front glass substrate 101. Are formed to be shorter than the distances W5, 6 (the distance farthest from the front glass substrate 101 in the z-axis direction) to the surfaces of the electrodes 103, 104.

That is, since the groove 207 becomes a part of the discharge space and has an atmosphere in which a small amount of discharge gas is sealed in a vacuum state, the relative dielectric constant of that part is estimated to be about 1. That is, by forming this groove 207,
Each of the electrodes 103 and 104 and the front glass substrate 101 between the display electrode 103 and the display scan electrode 104, that is, on the front glass substrate 101 side of the display electrode 103 and the display scan electrode 104 on the side of the front glass substrate 101 farthest from the point farthest from the front glass substrate 101. In the region surrounded by, a portion having a lower relative dielectric constant than the dielectric layer 205 is formed.

Therefore, for the same reason as in the first embodiment, the power consumption of the panel is suppressed. However, the relative permittivity in the groove 207 is different from that of the second dielectric in the first embodiment. Since the power consumption is lower than that of the layer 1052, power consumption of the panel can be further reduced. <Front Panel Manufacturing Method> The PDP manufacturing method according to the second embodiment is the same as the PDP manufacturing method according to the first embodiment.
Only the manufacturing method of the front panel is different from that of the first embodiment. Therefore, the different parts will be mainly described with reference to the drawings.

FIGS. 10 (1) to 10 (7) show the dielectric layer 205.
5 is a partially enlarged cross-sectional view of a front panel showing a method of forming a groove 207 by sandblasting in FIG. The front panel is formed by forming n display electrodes 103 and display scan electrodes 104 (only one display electrode is shown in FIG. 10) alternately and in parallel on the front glass substrate 101 in a stripe shape. It is manufactured by covering the surface with a dielectric layer 205 and further forming a protective film 206 on the surface thereof.

Display electrode 103 and display scan electrode 1
Numeral 04 denotes electrodes made of silver, for example, which are formed by applying a silver paste for an electrode at a predetermined interval (about 80 μm) by screen printing, and then firing. The dielectric layer 205 is formed on the entire surface of each of the electrodes 103 and 104 and the front glass substrate 101 by a screen printing method using the same lead-based dielectric layer paste as the first dielectric layer 1051 in the first embodiment. After being applied to the substrate, it is dried as shown in FIG. 10A.

On the surface of the dielectric layer 205, FIG.
A film-like resist film 210 as shown in (2) is laminated. It is preferable to use a resist film having UV curing properties, but the resist film 210 is not particularly limited. Next, as shown in FIG.
The resist film 210 is exposed to UV using the photomask 211 in which the position 7 is set, thereby forming an exposed portion 2101 and a non-exposed portion 2102. After that, this resist film 2
Non-exposed area 2 not cured by developing No. 10
102 is removed, and a pattern as shown in FIG. 10 (4) is formed.

By performing sandblasting on the front panel thus patterned, the front panel shown in FIG.
As shown in (5), the dielectric layer 205 other than the portion coated on the exposed portion 2101 is removed. Next, after exposing the exposed portion 2101 of the resist film 210 as shown in FIG. As a result, the dielectric layer 205 dries and shrinks and deforms, thereby forming a front panel on which the dielectric layer 205 having the smooth grooves 207 is formed as shown in FIG. An MgO film is formed on the front panel by using an electron beam evaporation method.
By forming the front panel (FIG. 9), a front panel is manufactured.

The groove 207 of the dielectric layer 205 is
Although it was formed by using the sand blast method, it is not limited to this method, and may be formed by using a photosensitive dielectric paste. FIG. 11 is a diagram illustrating a method of forming a front panel using a photosensitive dielectric paste.

First, as shown in FIG. 11A, a display electrode 103 and a display scan electrode 104 are formed on a front glass substrate 101 in the same manner as described with reference to FIG. Next, as shown in FIG.
5 is formed. The dielectric layer 205 is made of a mixture of a lead-based dielectric layer paste similar to the first dielectric layer 1051 in the first embodiment and, for example, a photocurable UV photosensitive resin. Each electrode 1 by printing method
03, 104 and the entire surface of the front glass substrate 101, and then dried.

Next, the dielectric layer 205 is exposed to light using a photomask similar to that shown in FIG. Then, by performing development and removing the non-exposed portions, FIG.
As shown in (4), a groove 207 is formed in the dielectric layer 205. Thereafter, by drying and baking, the dielectric layer 205 contracts, so that the groove 2 as shown in FIG.
A dielectric layer 205 having a layer 07 is formed.

On this, a front panel can be formed by forming a protective film of MgO using an electron beam evaporation method. <Modification of Second Embodiment> In the PDP of the second embodiment, the display electrodes 10
3 and the display scan electrode 104 on the front glass substrate 10
1, but the position of each electrode is not particularly limited. A dielectric layer is formed on the display electrode and the display scan electrode to insulate each electrode and to interpose both electrodes. A groove may be interposed in the groove.

FIG. 12 is a partially enlarged sectional view of a front panel according to a first modification of the second embodiment. As shown in the figure, the front panel includes a front glass substrate 101, a display electrode 203, a display scan electrode 204, and a dielectric layer 215.
a, b, and a protective film 206 are provided. Front glass substrate 101
A dielectric layer 215a in which a groove is formed is disposed on the surface of the substrate, a display electrode 203 is disposed on one of the dielectric layers 215a sandwiching the groove, and a display scan electrode 204 is disposed on the other. These electrodes 203 and 204 and the dielectric layer 21
The dielectric layer 215b is coated so as to entirely cover the dielectric layer 5a, and a groove 217 is formed at a groove portion of the dielectric layer 215a. The protective film 206 is formed on the entire surface of the dielectric layer 215b.
Is coated.

Here, the distance W21 between the bottom of the groove 217 and the front glass substrate 101 is the distance W22 between the display electrode 203 and the display scan electrode 204 and the front glass substrate 101,
It is set shorter than W23. By satisfying such a condition, the display electrode 203 and the display scan electrode 2
04, that is, each electrode 20 on the front glass substrate 101 side from the point farthest from the front glass substrate 101 of the display electrode 203 and the display scan electrode 204.
3, 204, and a region surrounded by the front glass substrate 101, a portion having a lower relative dielectric constant than the dielectric layers 215a, 215b is formed. Power consumption at the time can be suppressed. Note that as a method for forming the groove 217, a sand blast method can be used.

In the second embodiment, the protective film 206 is formed between the display electrode 103 and the display scan electrode 1.
You may make it divide into the 04 side. FIG.
It is a partially expanded step view of the front panel of the modification 2 of the PDP in the embodiment. As shown in the figure, if a notch 216a is provided in the protective film 216 at the bottom of the groove 227, the charge moves on the surface of the protective film 216 after the wall charge is formed, that is, the wall charge is formed. Since it is considered that electric charges can be prevented from leaking from one cell to another cell through the protective film, it is considered that there is an effect of further suppressing a lighting failure.

In the second embodiment, the display electrode 103 and the display scan electrode are connected to the front glass substrate 1.
Although the electrodes are formed in parallel with 01, each electrode may be inclined with respect to the front glass substrate. FIG. 14 is a partially enlarged cross-sectional view of a front panel according to a third modification of the second embodiment.

As shown in the figure, the front panel of the third modification includes a front glass substrate 101, display electrodes 213, display scan electrodes 214, dielectric layers 225a and 225b, and a protective film 226. As a method of manufacturing this front panel,
First, a dielectric layer 225a is formed on the front glass substrate 101 at a predetermined interval by a screen printing method. Next, the display electrode 21 is set so as to cover the edge of the dielectric layer 225a.
3. The display scan electrodes 214 are applied in a line by using a screen printing method. Thereafter, a dielectric layer 225b is applied to the entire surface, and dried and fired. By this drying and firing, the groove-side edge of the dielectric layer 225a shrinks, and the groove 2
As shown in FIG. 14, the electrodes 213 and 214 are formed so as to be inclined toward the groove 237. Here, the distance W24 between the bottom of the groove 237 and the front glass substrate 101 (the thickness of the dielectric layer 225b) is
The distance is set to be shorter than the farthest distance between the front glass substrate 101 and the front glass substrate 101. By satisfying such conditions, each of the distance between the display electrode 213 and the display scan electrode 214, that is, each of the display electrode 213 and the display scan electrode 214 on the front glass substrate 101 side from a point farthest from the front glass substrate 101. Electrode 21
In the region surrounded by 3,214 and the front glass substrate 101, a portion having a lower relative dielectric constant than the dielectric layers 225a and 225b is formed, so that the sustain discharge is performed as in the second embodiment. Power consumption at the time can be suppressed.

(Example 2) (Examples 9 to 11) The front panel of the PDP is shown in FIG.
A sample provided in such a form as described above was produced. Here, the dielectric layer is made of PbO (75 wt%)-B ₂ O ₃ (15 wt%).
%)-SiO ₂ (10 wt%), formed by a sandblast method (No. 9), formed using a photosensitive dielectric paste (No. 10), and
9 and the discharge gas pressure was increased (320 kP
a) A product (No. 11) was produced.

(Example Samples 12 and 13) Samples were prepared in which the front panel of the PDP was provided in the form shown in FIG. Here, a discharge gas having a discharge gas pressure of 66.5 kPa (No. 12) and a discharge gas having a discharge gas pressure increased to 320 kPa (No. 13) were produced. (Example Samples 14 and 15) Samples were prepared in which the front panel of the PDP was provided in the form shown in FIG. Here, the discharge gas pressure was 66.5 kPa (No. 1).
4) and the discharge gas pressure increased to 320 kPa (N
o. 15) was produced.

(Examples 16 and 17) Samples were prepared in which the front panel of the PDP was provided in the form shown in FIG. Here, a discharge gas pressure of 66.5 kPa (No. 16) and a discharge gas pressure of 320 kPa (No. 17) were produced. (Comparative Samples 18 and 19) Comparative Samples were prepared in which the front panel of the PDP was provided in the form shown in FIG.

Here, a discharge gas pressure of 66.5 kPa (No. 18) and a discharge gas pressure of 320 kPa
(No. 19). Each of the above PDPs
Sample No. In 9 to 19, 200 mm x 30
An electrode having a size of 0 mm was prepared, and NP-4028 manufactured by Noritake Co., Ltd. was used as a silver paste for forming a display electrode and a display scan electrode, and the electrode was formed so as to have a film thickness of 5 μm and a width of 80 μm. In addition, each sample has M
The gO protective film was formed to a thickness of 0.5 μm by using an electron beam evaporation method. As the discharge gas, neon 95 vol
%, Xenon 5 vol% mixed gas was used.

[Experiment 1] Experimental method: Each of the above Examples 9 to 17 and Comparative Examples 18 and 19 were connected to a PDP driving device having the same configuration, and a sustain discharge voltage, relative luminous efficiency, And the input power were measured. The input waveform to the display electrode and the display scan electrode at this time is 10 k
A rectangular wave having a Hz and a duty ratio of 10% was used.

Results and Discussion: Table 2 shows the experimental results.

[0079]

[Table 2] As can be seen from this table, in the case of Comparative Example Sample 18,
The voltage required to maintain the discharge is 340 V, and the power at that time is 42 W, and the relative luminous efficiency in that case is 0.50 lm / W.

On the other hand, each of the sample samples 9, 10, 12,
14 and 15, the power consumption is 37 W or less, and the discharge sustaining voltage is 300 V or less, which indicates that the discharge sustaining voltage and the power consumption can be suppressed by about 10% or more as compared with the related art. In addition, no lighting failure was observed. Further, it can be seen that the same effect is obtained even when the discharge gas pressure is increased.

From the above results, by providing a groove between the display electrode and the display scan electrode, it is possible to form a wall charge on the dielectric layer having a high relative dielectric constant while forming the relative dielectric constant between the display electrode and the display scan electrode. Since the rate can be reduced, power consumption during sustain discharge can be suppressed without causing lighting failure. Third Embodiment Next, a PDP and a PDP display device according to a third embodiment will be described with reference to the drawings.

The PDP and the PDP display device according to the third embodiment have substantially the same configuration as the PDP and the PDP display device described in the first embodiment with reference to FIGS. Since only the configuration of the front panel is different, the description will focus on the different parts. FIG.
FIG. 2 is an enlarged perspective view of a part of a front panel according to the embodiment. 1 to 3 have the same configuration and will not be described.

As shown in the figure, in the front panel according to the third embodiment, display electrodes 103 and display scan electrodes 104 are arranged in a row on a front glass substrate 101 (one each in this figure). Only the book is shown.), A dielectric layer 305 is formed so as to cover the electrodes, and the electrodes 103 and 104 on the dielectric layer 305 are formed.
Between them, a recess 307 is provided at a position facing an address electrode (not shown).

The dielectric layer 305 has the same composition as the first dielectric layer 1051 in the first embodiment, and has a relative dielectric constant of about 11. The surface of the dielectric layer 305 is covered with a protective film made of MgO or the like.
The depression 307 has a thickness at the bottom (the depression 307).
Is formed so that the distance between the front glass substrate 101 from the bottom of the substrate 103 and the front glass substrate 101 is shorter than the thickness of each of the electrodes 103 and 104 (the distance between each of the electrodes 103 and 104 from the front glass substrate 101). The depression 307 is a discharge space filled with a discharge gas having a low relative dielectric constant, similarly to the groove 207 in the second embodiment. That is, hollow 30
7, the electrodes between the display electrode 103 and the display scan electrode 104, that is, each electrode on the front glass substrate 101 side from the point farthest from the front glass substrate 101 of the display electrode 103 and the display scan electrode 104. In a region surrounded by 103, 104 and the front glass substrate 101, a portion having a relative dielectric constant smaller than that of the dielectric layer 305 is formed. For the same reason as in the second embodiment, the panel is formed. Will be suppressed.

FIG. 16 is a view showing a recess 3 in the front panel.
It is sectional drawing which shows the case where the thickness of the bottom part of 07 is changed.
In order to optimize the thickness of the bottom of the recess 307, PDP samples in which the thickness of the bottom 307a of the recess 307 is varied as shown by a broken line in FIG. Thickness 10
μm) Luminous efficiency and minimum sustain discharge voltage of each PDP were measured with respect to the distance of the bottom 307a from the surface in the z-axis direction.
The result is shown in FIG.

As shown in FIG.
As the distance in the z-axis direction from the surface to the bottom 307a of the depression is in the negative direction, that is, as the bottom 307a of the depression 307 approaches the front glass substrate 101 side, the luminous efficiency is improved and the minimum sustain discharge for causing the sustain discharge is generated. It can be seen that the voltage value decreases. This is because, as in the second embodiment, the recess 307 is a discharge space of an atmosphere in which a small amount of discharge gas is sealed in a vacuum state, and the relative dielectric constant of that portion is estimated to be about 1. It is thought that it is.

The method for forming the depression 307 can be a sand blast method or a method using a photosensitive dielectric material as described in the first and second embodiments. Also, the depression 307 of the protective film 306
If the notch as described in the modification of the second embodiment is provided at the bottom of the second embodiment, the same effect can be obtained.

(Modification of Third Embodiment) In the third embodiment, the display electrodes 103,
Although the display scan electrodes 104 are provided in a line shape, the display scan electrodes 104 may be shaped so that a part of each electrode approaches the depression. FIG. 18 is a perspective view of a front panel according to a modification of the third embodiment.

As shown in the figure, a display electrode 303 and a display scan electrode 3 are provided on the front panel in this modification.
At 04, projecting portions 303 a and 304 a are provided at positions close to the recesses 317. Thus, the distance between the display electrode 303 and the display scan electrode 304 can be reduced as a whole at the protruding portions 303a and 304a, while the distance is secured as a whole. Therefore, it is considered that the power consumption can be suppressed by lowering the discharge starting voltage while securing the discharge area.

In the third embodiment, each of the electrodes 103 and 104 is disposed directly on the front glass substrate 101. However, like the first modification of the second embodiment, the electrodes 103 and 104 are You may comprise so that a dielectric layer may be interposed between front glass substrates. FIG. 19 is a partially enlarged cross-sectional view of the front panel according to the second modification. As shown in the figure, for example, after a display electrode 313 and a display scan electrode 314 are formed on a dielectric layer 315a having a depression, a dielectric layer 315b and a protective film 316 are coated on the entire upper surface thereof. Each electrode 313, 314 and front glass substrate 10
1 may be provided via a dielectric layer 315a. With such a configuration, the depression 327 is formed on the depression of the dielectric layer 315a, and thus it is considered that the same effect as that of the third embodiment can be obtained.

In the third embodiment, the electrodes 103 and 104 and the front glass substrate 101 are arranged in parallel. However, the third embodiment differs from the third embodiment in the third modification. Similarly, each electrode may be configured to be inclined with respect to the front glass substrate. FIG. 20 is a partially enlarged cross-sectional view of the front panel according to the third modification. As shown in the figure, a display electrode 323 and a display scan electrode 324 are formed on a dielectric layer 325a, and the dielectric layer 3
After coating, drying and baking, the electrodes 323 and 324 face each other due to the shrinkage of the dielectric layer 325a, that is, the other electrode side end of each electrode is closer to the other end than the other end. May also be disposed so as to be closer to the front glass substrate 101 in the z-axis direction. Also by this, a region having a low relative dielectric constant is formed between the display electrode 323 and the display scan electrode 324 with the depression 337 interposed therebetween, and thus it is considered that the same effect as in the third embodiment can be obtained. .

In the third embodiment, the depression 307 is formed. However, the depression has a lower dielectric constant than that of the first dielectric layer in the first embodiment. A dielectric layer such as a second dielectric layer in the embodiment may be provided. As a result, a region having a low relative dielectric constant is formed in a region surrounded by the display electrode and the display scan electrode, and the front glass substrate.
It is considered that the same effect as in the third embodiment can be obtained.

[Fourth Embodiment] Next, a fourth embodiment of the present invention will be described.
A PDP and a PDP display device according to the embodiment will be described with reference to the drawings. The PDP and the PDP display device according to the fourth embodiment are the same as the PDP and the PDP described in the first embodiment with reference to FIGS.
The structure is substantially the same as that of the DP display device, and only the structure of the front panel is different.

FIG. 21 is an enlarged sectional view of a part of the front panel according to the fourth embodiment. As shown in the figure, in the front panel of the fourth embodiment, display electrodes 403 and display scan electrodes 404 are arranged in rows at a distance L on the front glass substrate 101 (in FIG. Only one is shown.), And a dielectric layer 405 and a protective layer 406 are formed to cover these electrodes. In the dielectric layer 405, each of the electrodes 403, 40
A groove 407 extending in a direction along each electrode is provided in a region surrounded by 4 and front glass substrate 101.
This is the same as in the first embodiment, except that the display electrode 4
03 and the display scan electrode 404.

Display electrode 403 and display scan electrode 4
04 has a rectangular cross-sectional shape, and has a width W41,
It has a thickness W42. Here, each electrode 403, 40
4 is the aspect ratio, ie, thickness W42 / width W4.
What is necessary is just to be formed so that the value of 1 is 0.07 or more and 2.0 or less, and it is preferable that the thickness W42 is in the range of 3 to 20 μm. Such an electrode having a high aspect ratio is obtained by repeating printing and drying until a predetermined film thickness is obtained, and then firing.

Here, the aspect ratio of the display electrode 403 and the display scan electrode 404 is set to 0.07 or more because, when the aspect ratio is smaller than 0.07, the respective electrodes 403 and 404 are set. This is because it has been experimentally confirmed that the electric resistance value in the above becomes unstable and becomes unsuitable as an electrode.
More preferably, it is 5 or more. On the other hand, when the aspect ratio exceeds 2.0, it has been experimentally confirmed that the electric resistance of each electrode increases and the power consumption of the panel increases.

Display electrode 403, display scan electrode 404
The thickness W42 is set to 20 μm or less because a thin film process and a thick film process generally used for forming an electrode cannot be formed so that the thickness W42 exceeds 20 μm. This is because it is difficult to form a thick film in a thin film process, and in a thick film process, a predetermined shape cannot be formed because the film thickness cannot be maintained during firing. On the other hand, the reason why the thickness W42 is set to 3 μm or more is that when the film thickness is less than 3 μm, the electric resistance value of the electrode rapidly increases and the electrode cannot be used as an electrode. Therefore, the thickness W4 of the display electrode and the display scan electrode
2 is preferably 3 to 20 μm, and in consideration of the thickness W42, the electric resistance of the electrodes, and the aperture ratio of the panel, the width W41 of the display electrode and the display scan electrode is preferably 43 to 70 μm.

The dielectric layer 405 has the same composition as that of the first dielectric layer 1051 in the first embodiment, and has a relative dielectric constant of about 11. The thickness of the dielectric layer 405 at the bottom of the groove 407 (the distance from the bottom of the groove 407 to the front glass substrate 101) is different from that of each of the electrodes 403 and 4.
The discharge space is formed so as to be thinner than the thickness W42 of 04, and is a discharge space filled with a discharge gas having a low relative dielectric constant, similarly to the groove 207 in the second embodiment.

Therefore, the power consumption of the panel is suppressed for the same reason as in the second embodiment. The display electrode 403 and the display scan electrode 40
4 aspect ratio (thickness W42 / width W41 = 0.07-
2.0) is a conventional electrode (aspect ratio: about 0.05)
The width W41 can be reduced if the cross-sectional area is the same as that of the conventional electrode. That is, the display electrode 40 made of a metal that does not easily transmit visible light is used.
3, and the shielding area of the display scan electrode 404 in the visible light transmission direction decreases. Further, even when the cell pitch is small, the distance L between the electrodes required in a cell of a limited size is required.
Can take. Therefore, the aperture ratio of the panel is increased, and the space where the discharge occurs is widened, so that the luminous efficiency of the panel can be improved.

Furthermore, in the case of the display electrode 403 and the display scan electrode 404 having such a large aspect ratio, the thickness of each electrode is larger than that of the related art, and the area of each electrode facing the other electrode is increased. Therefore, the volume of the discharge space between the electrodes can be increased by forming the groove deeply. Therefore, a strong electric field intensity can be obtained in a wide area between the display electrode 403 and the display scan electrode 404, so that the discharge starting voltage at the time of the sustain discharge is lower than in the related art, and the power consumption of the panel can be further suppressed. it can.

Incidentally, the method of forming the groove 407 is as follows.
It can be formed by a sand blast method or a method using a photosensitive dielectric material as described in the first and second embodiments. (Modification of Fourth Embodiment) In the fourth embodiment, the display electrodes 403 and the display scan electrodes 404 are provided so as to have a rectangular cross section. The shape may be a pyramid-shaped cross section in which the width becomes narrower as the distance increases. Each electrode having such a pyramid-shaped cross-sectional shape can be formed by repeatedly applying and drying the paste using a screen printing method to reduce the width and apply the paste repeatedly.

FIG. 22 is a partially enlarged sectional view of a front panel according to a modification of the fourth embodiment. As shown in the figure, the front panel in the present modification has a display electrode 413.
In addition, the sectional shape of the display scan electrode 414 is a pyramid shape. In a general PDP, there is a problem that the electrode is peeled off from the front glass substrate due to warpage of the electrode end caused by contraction of the electrode material during firing of the electrode. Since the electrode 413 and the display scan electrode 414 have a pyramid shape, the amount of the electrode material on the upper part of the pyramid is small, and the shrinkage stress in the direction of warpage of the electrode during firing is reduced, and such a phenomenon can be suppressed.

Further, by forming the display electrode 413 and the display scan electrode 414 in such a shape, the contact area between the dielectric layer 405 and each of the electrodes 413 and 414 increases. On the other hand, the film properties are also improved. In the fourth embodiment, the groove 407 is provided in a region surrounded by the display electrode 403, the display scan electrode 404, and the front glass substrate 101 to increase the electric field between the electrodes. If the display electrode and the display scan electrode have a larger aspect ratio than before, the aperture ratio of the panel can be improved even if the area does not always reach or does not exist in the area, thereby improving the luminous efficiency of the panel Can be done.

FIG. 23 is a partially enlarged cross-sectional view of a front panel according to a modification of the fourth embodiment. As shown in the figure, in the front panel according to the present modification, the thickness W53 of the dielectric layer 505 between the display electrode 403 and the display scan electrode 404 is formed larger than the thickness W42 of each of the electrodes 403 and 404. . by this,
No groove is formed (indicated by (A) in the figure), or the bottom of the groove does not reach a region surrounded by the display electrode 403, the display scan electrode 404, and the front glass substrate 101 ((B), (C) in the figure). )).

In such a panel, the display electrodes 4
03, and the aspect ratio of the display scan electrode 404 are set to have the same value as in the fourth embodiment, and are set to be larger than the conventional electrode (aspect ratio: about 0.05). As in the fourth embodiment,
The aperture ratio of the panel is improved, and the luminous efficiency of the panel can be improved.

Further, if the groove is provided, the bottom of the groove does not reach the region surrounded by the display electrode 403, the display scan electrode 404, and the front glass substrate 101 (see (B) and (C) in the figures). (Shown), the lines of electric force between the electrodes increase, and the electric field intensity increases, so that the power consumption of the panel can be suppressed. In the fourth embodiment, the groove 407 for forming a region having a small relative dielectric constant is provided in a region surrounded by the display electrode 403, the display scan electrode 404, and the front glass substrate 101. The present invention can be implemented by providing a second dielectric layer similar to that of the first embodiment in a region surrounded by the display scan electrode and the front glass substrate. Also in this case, for the same reason as in the fourth embodiment,
The power consumption of the panel can be reduced.

In the fourth embodiment, the groove 407 is formed in a region surrounded by the display electrode 403, the display scan electrode 404, and the front glass substrate 101. However, in the third embodiment, Similarly to the above, the present invention can be implemented even if a recess is provided instead of the groove. (Embodiment 3) In Embodiment 3, the following samples 20 to 25 having substantially the same configuration as Embodiment 2 and having different sizes and shapes of display electrodes and display scan electrodes were manufactured.

(Example Sample 20) As shown in FIG. 21, a PDP sample in which the cross-sectional shape of the display electrode and the display scan electrode was rectangular was produced. The width of the display electrode and the display scan electrode is 30 μm, the film thickness is 15 μm (aspect ratio is 0.5), and the distance between them is 100 μm.
And

(Example Sample 21) As shown in FIG. 22, a PDP sample in which the sectional shape of the display electrode and the display scan electrode was a pyramid was prepared. The display electrode and the display scan electrode had a width of 50 μm at the wide portion on the front glass substrate side, a thickness of 15 μm (aspect ratio 0.3), and a distance between the electrodes of 100 μm.

(Example Samples 22 to 24) The size of the electrodes is the same as that of Sample 20, and as shown in FIG. 23, the thickness W53 of the dielectric layer between the display electrode and the display scan electrode is equal to that of each electrode. A PDP sample provided thicker than the thickness W42 (15 μm) was manufactured. Here, the thickness of the dielectric layer between the display electrode and the display scan electrode is set to 40 μm as shown in FIG. 23A (Example sample 22), and the dielectric layer as shown in FIG. Having a thickness of 30 μm (Example sample 23),
As shown in (C), a dielectric layer having a thickness of 15 μm (Example sample 24) was produced. The width of the display electrode and the display scan electrode is 30 μm, and the film thickness is 15 μm.
The distance between them was 100 μm, and the thickness of the dielectric layer other than between the display electrode and the display scan electrode was 40 μm.

(Example sample 25) [0111] The sample has the same structure as that of the above-mentioned example sample 22, and the shape of the electrode is the same as that of the example sample 2.
Formed in the same manner as 1. (Comparative Example Sample 26) PDP in which the shape of the display electrode and the display scan electrode is a thin flat plate as shown in FIG.
Was prepared. The display electrode and the display scan electrode had a width of 100 μm and a thickness of 5 μm (aspect ratio 0.05).

[Experiment 1] Experimental method: Each of the above Examples 20 to 25 and Comparative Example Sample 26 were connected to a PDP driving device having the same configuration, and a sustain discharge voltage, a relative luminous efficiency, and a supply during driving of the PDP were measured. The power was measured. The input waveform to the display electrode and the display scan electrode at this time is 10 kHz.
A rectangular wave having a z and a duty ratio of 10% was used.

Results and discussion: Table 3 shows the experimental results.

[0114]

[Table 3] As can be seen from this table, in the case of Comparative Sample 26,
The voltage required to maintain the discharge is 340 V, and the power is 42
W is required, in which case the relative luminous efficiency is 0.50
lm / W.

On the other hand, in each of the sample samples 20 and 21, the power consumption was 37 W or less, and the discharge sustaining voltage was 320 V or less. We can see that we can do it. In addition, no lighting failure was observed. Further, the luminous efficiency shows a value of 0.70 lm / W or more, which indicates that the efficiency can be improved by 40% or more as compared with the related art.

Further, in each of the sample samples 22 to 25, as the thickness of the dielectric layer between the display electrode and the display scan electrode decreases, the discharge sustaining voltage decreases and the luminous efficiency improves. . Even in Example Sample 22 in which no groove is present between the display electrode and the display scan electrode, the aspect ratio of each electrode is formed larger than before, so that the luminous efficiency is improved as compared with the conventional one. It was confirmed that. From the results of the sample 26, it was confirmed that the same applies to the case where the cross-sectional shape of the display electrode and the display scan electrode was formed in a pyramid shape.

From the above results, the luminous efficiency can be remarkably improved by setting the aspect ratio of the display electrode and the display scan electrode to be larger than that of the related art. Further, by providing a groove in a region surrounded between the display electrode, the display scan electrode, and the front glass substrate, the power consumption during the sustain discharge can be reduced without causing a lighting failure as in the second embodiment. Can be suppressed.

(Modifications of First, Second, Third, and Fourth Embodiments) In each of the above embodiments, the partition walls are formed in a stripe shape. The present invention can be applied to a case where a plurality of auxiliary partition walls are provided, and a plurality of partition walls having a cross-girder shape or a plurality of meandering linear partition walls are provided. In each of the above embodiments, the PDP is described as an example. However, the present invention can be applied to a plasma addressed liquid crystal having the same surface discharge type structure. Further, in each of the above embodiments, the silver electrode is provided as the display electrode and the display scan electrode. However, an electrode other than silver may be provided, and the present invention may be implemented by providing a known transparent electrode as an auxiliary electrode for assisting this. can do. In this case, the aspect ratio of the transparent electrode is not considered.

[0119]

As described above, according to the surface discharge type display device of the present invention, the first panel in which a plurality of pairs of electrodes are arranged on one main surface of the substrate, A plurality of electrodes are arranged in a row, and a second panel is disposed in parallel with the first panel via the partition so that the electrodes face the electrode pairs of the first panel. A discharge gas is filled in each discharge space partitioned by a partition wall between the first panel and the second panel, and a surface discharge for displaying an image by utilizing a surface discharge performed between the electrode pairs. In the display device, the electrode pair is covered with a first dielectric layer, and the first dielectric layer is formed in a region surrounded by the electrode and the electrode of the electrode pair and the substrate of the first panel. An area with a lower dielectric constant than the body layer is formed. So that there. Therefore, wall charges can be stored in the first dielectric layer. On the other hand, since the relative dielectric constant between the electrodes of the electrode pair can be reduced, the amount of current during sustain discharge can be suppressed. Therefore, it is possible to suppress the power consumption of the panel while suppressing the lighting failure.

Further, the surface of the first dielectric layer has a recess formed on the substrate side of the first panel between the electrodes of the electrode pair, and the surface of the first dielectric layer extends from the substrate of the front panel. Since the distance in the substrate vertical direction to the bottom of the groove is formed shorter than the distance from the electrode to the surface, the low dielectric constant region is formed,
The groove portion is filled with a discharge gas having a low relative dielectric constant of about 1 to lower the relative dielectric constant between the electrodes of the electrode pair, thereby further suppressing power consumption of the panel.
Here, the groove may be a depression. Such grooves and depressions can be easily formed by using a sand blast method or a dielectric paste method.

Further, since the aspect ratio, which is the ratio between the thickness and the width of the electrode pair, is set to be 0.07 or more and 2.0 or less, the discharge space can be widened and the aperture ratio of the panel can be increased. The luminous efficiency of the panel can be improved.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of a PDP according to a first embodiment of the present invention from which a front glass substrate is removed.

FIG. 2 is a partial schematic cross-sectional perspective view of the PDP according to the first embodiment of the present invention.

FIG. 3 is a block diagram of the PDP display device according to the first embodiment of the present invention.

FIG. 4 is an enlarged cross-sectional view of a part of the PDP in FIG. 2 when viewed from the x-axis direction.

FIG. 5 is a process chart of a PDP for illustrating a method of forming a front panel using a metal mask method, wherein
It proceeds in the order of (6).

FIG. 6 is a process chart of a PDP for illustrating a method of forming a front panel using a nozzle injection method, and (1) to (6).
Proceed in the order of the numbers.

FIG. 7 is an enlarged cross-sectional view of a part of a PDP in a modification of the first embodiment.

FIG. 8 is an enlarged cross-sectional view of a part of a PDP according to a modification of the first embodiment.

FIG. 9 is a partially enlarged cross-sectional view of a PDP according to a second embodiment when viewed from the x-axis direction.

FIG. 10 is a process chart of a PDP for illustrating a method of forming a front panel by using sandblasting, wherein (1) to (1) to FIG.
The process proceeds in the numerical order of (7).

FIG. 11 is a process chart of a PDP for illustrating a method of forming a front panel using a photoconductor paste, and FIGS.
It proceeds in the order of (5).

FIG. 12 is an enlarged cross-sectional view of a part of a PDP in a modification of the second embodiment.

FIG. 13 is an enlarged cross-sectional view of a part of a PDP according to a modification of the second embodiment.

FIG. 14 is an enlarged cross-sectional view of a part of a PDP in a modification of the second embodiment.

FIG. 15 is a partial schematic cross-sectional perspective view of a PDP according to a third embodiment.

FIG. 16 is an enlarged sectional view of a part of a PDP according to a third embodiment.

FIG. 17 is a graph showing measured values of the luminous efficiency of the panel and the voltage during sustain discharge when the height of the depression in FIG. 16 is changed.

FIG. 18 is a partial schematic cross-sectional view of a PDP in a modified example of the third embodiment.

FIG. 19 is a partial schematic cross-sectional view of a PDP in a modified example of the third embodiment.

FIG. 20 is a partial schematic cross-sectional view of a PDP in a modified example of the third embodiment.

FIG. 21 is an enlarged sectional view of a part of a PDP according to a fourth embodiment.

FIG. 22 is a partial schematic cross-sectional view of a PDP in a modified example of the fourth embodiment.

FIG. 23 is a partial schematic cross-sectional view of a PDP in a modified example of the fourth embodiment.

FIG. 24 is a partial schematic cross-sectional perspective view of a conventional general PDP.

25 is an enlarged cross-sectional view of a part of the PDP in FIG. 24 when viewed from the x-axis direction.

[Explanation of symbols]

REFERENCE SIGNS LIST 100 PDP 101 front glass substrate 102 rear glass substrate 103, 403 display electrode 104, 404 display scan electrode 105, 205, 305, 405 dielectric layer 106, 206, 406 protective film 108 address electrode 109 visible light reflective layer 110 partition 111R, G, B phosphor layer 122 discharge space 150 PDP drive device 153 display driver circuit 154 display scan driver circuit 155 address driver circuit 160 PDP display device 201 metal plate 207, 407 groove 307 depression 1051 first dielectric layer 1052 second dielectric Layer 2020 Paste injection device

 ──────────────────────────────────────────────────続 き Continued on front page (31) Priority claim number Japanese Patent Application No. 2000-110261 (P2000-110261) (32) Priority date April 12, 2000 (2000.4.12) (33) Priority claim country Japan (JP) (72) Inventor Ryuichi Murai 1006 Kadoma Kadoma, Osaka Pref. Matsushita Electric Industrial Co., Ltd. 5C027 AA05 AA06 5C040 FA01 FA04 GB03 GB14 GC02 GC11 GD01 GD02 GD03 GD07 GD09 GE01 JA02 JA12 JA17 KA08 KA09 KB19 KB29 MA12 MA17 5C094 AA22 BA31 CA19 DA14 EA04 EA07 EB02 FB16 JA01 JA08

Claims (36)

[Claims] 1. A first panel in which a plurality of pairs of electrodes are arranged in a row on one main surface of a substrate, and a plurality of electrodes and partition walls are arranged in a row on the substrate, wherein the electrodes and the first panel are arranged. A second panel disposed so as to face the first panel in parallel so as to face the pair of electrodes.
A discharge gas is filled in each discharge space partitioned by a partition wall between the first panel and the second panel, and a surface discharge type display device that displays an image by using a surface discharge performed between the electrode pairs. The electrode pair is covered with a first dielectric layer, and a region surrounded by the electrode and the electrode of the electrode pair and the substrate of the first panel is higher than the first dielectric layer. A surface discharge type display device, wherein a region having a low relative dielectric constant is formed. 2. A second dielectric layer different from the first dielectric layer is disposed in a region surrounded by the electrodes of the electrode pair and the electrodes, and the substrate of the first panel. The surface discharge type display device according to claim 1, wherein the second dielectric layer has a lower relative dielectric constant than the first dielectric layer. 3. The surface discharge type display device according to claim 2, wherein said second dielectric layer is equal to or thicker than said electrode pair. 4. The semiconductor device according to claim 2, wherein the second dielectric layer is made of a dielectric material containing sodium.
Or a surface discharge type display device according to item 3. 5. The method according to claim 1, wherein the dielectric material containing sodium is N
surface discharge type display device according to claim 4, characterized in that the _{a 2 O-B 2 O 3} -ZnO 6. The device according to claim 1, wherein the region having a low relative dielectric constant is a region existing as a part of the discharge space without forming the first dielectric layer. The surface discharge type display device according to the above. 7. The surface of the first dielectric layer has a groove formed between the electrodes of the electrode pair in the direction of the substrate of the first panel, and the first dielectric layer has a groove formed therein. The distance in the substrate vertical direction from the substrate of the panel to the bottom of the groove is formed shorter than the distance from the electrode to the surface, so that the low dielectric constant region is formed. Item 7. A surface discharge type display device according to item 6. 8. The device according to claim 7, further comprising a protective film covering the first dielectric layer, wherein the protective film has a discontinuous portion between the electrodes in the electrode pair. Surface discharge type display device. 9. The surface discharge type display device according to claim 8, wherein a discontinuous portion of the protective film is formed in the groove. 10. A recess formed between the electrodes of the electrode pair on the surface of the first dielectric layer, and a substrate extending from a substrate of the first panel to a bottom of the recess. 7. The region having a low relative dielectric constant is formed by forming a distance in a vertical direction shorter than a distance from the electrode to the surface.
Surface discharge type display device according to 1. 11. The device according to claim 10, further comprising a protective film covering the first dielectric layer, wherein the protective film has a discontinuous portion between the electrodes in the electrode pair. Surface discharge type display device. 12. The surface discharge type display device according to claim 11, wherein the discontinuous portion of the protective film is formed in the depression. 13. The device according to claim 1, wherein a part of the first dielectric layer is arranged between the pair of electrodes and a substrate of the first panel. The surface discharge type display device according to the above. 14. At least one of the electrodes in the electrode pair is inclined with respect to the substrate of the first panel, and one end of the inclined electrode on the other electrode side is more inclined than the other end of the first panel. 14. The surface discharge type display device according to claim 13, wherein the surface discharge type display device is arranged close to the substrate. 15. The semiconductor device according to claim 1, wherein the first dielectric layer is made of a dielectric material containing lead.
A surface discharge type display device according to any one of the above. 16. The lead-containing dielectric material is PbO-
Surface discharge type display device of claim 15, which is a B ₂ O ₃ -SiO _2. 17. The surface discharge type display device according to claim 1, wherein an aspect ratio, which is a ratio between a thickness and a width of the electrode pair, is 0.07 or more and 2.0 or less. . 18. The surface discharge type display device according to claim 1, wherein an aspect ratio, which is a ratio of a thickness to a width of the electrode pair, is 0.15 or more and 2.0 or less. . 19. The thickness of the electrode pair is 3 μm or more and 20 μm.
m and the width of the electrode pair is 43 μm or more and 70 μm or more.
18. The surface discharge type display device according to claim 17, wherein the thickness is not more than μm. 20. The surface discharge type display device according to claim 17, wherein a cross-sectional shape of the electrode pair has a pyramid shape which is wider on the substrate side of the first panel. . 21. A first panel in which a plurality of pairs of electrodes are arranged in a row on one main surface of a substrate, and a plurality of electrodes and partition walls are arranged in a row on the substrate, wherein the electrodes and the first panel are arranged. So that the first electrode pair faces the first electrode pair via the partition wall.
A second panel disposed parallel to and facing the panel, a discharge gas is sealed in each discharge space partitioned by a partition wall between the first panel and the second panel, and In a surface discharge type display device for displaying an image by utilizing the performed surface discharge, an aspect ratio which is a ratio of the thickness and the width of the electrode pair is 0.0.
7 or more and 2.0 or less. 22. The surface discharge type display device according to claim 21, wherein an aspect ratio which is a ratio of a thickness to a width of the electrode pair is 0.15 or more and 2.0 or less. 23. The thickness of the electrode pair is 3 μm or more and 20 μm.
m and the width of the electrode pair is 43 μm or more and 70 μm or more.
22. The surface discharge type display device according to claim 21, wherein the thickness is not more than μm. 24. The surface discharge type display device according to claim 21, wherein a cross-sectional shape of the electrode pair has a pyramid shape which is wider on the substrate side of the first panel. 25. The surface discharge type display device, comprising: a PDP.
The surface discharge type display device according to any one of claims 1 to 24, wherein 26. A PDP having an electrode for applying a voltage
And a display drive circuit connected to the electrodes of the PDP and applying a voltage to drive the PDP for display.
26. A DP display device, wherein the PDP is used as the PDP.
A PDP display device characterized by using the PDP described in (1). 27. The method of manufacturing a surface discharge display device according to claim 2, wherein after the first step of arranging the electrode pairs on the substrate of the first panel, the electrodes and the electrodes of the electrode pairs, and In the area surrounded by the substrate of the first panel,
A method for manufacturing a surface discharge type display device, comprising a second step of applying a dielectric paste to be a second dielectric layer. 28. The method according to claim 27, wherein a metal mask method or a nozzle injection method is used when applying the dielectric paste in the second step. 29. The method of manufacturing a surface discharge display device according to claim 7, wherein a first step of arranging an electrode pair on the substrate of the first panel is provided, and the electrode pair is covered and between the electrode pair. Forming a first dielectric layer so as to have a groove. 30. In the second step, a material of the first dielectric layer is formed in a layer on the surface of the electrode pair and the first panel, and the groove is formed by removing the material between the electrode pair. The method for manufacturing a surface discharge type display device according to claim 29, wherein the display device is formed. 31. The method for manufacturing a surface discharge type display device according to claim 29, wherein a sand blast method is used as a method of forming a groove in the second step. 32. The method according to claim 29, wherein a dielectric paste method is used when the material of the first dielectric layer is formed in a layer on the electrode pair and the surface of the first panel in the second step. 3. The method for manufacturing a surface discharge type display device according to item 1. 33. The method of manufacturing a surface discharge type display device according to claim 10, wherein a first step of arranging an electrode pair on the substrate of the first panel is provided, and the electrode pair is covered and between the electrode pair. Forming a first dielectric layer so as to have depressions. 34. In the second step, the material of the first dielectric layer is formed in a layer on the surface of the electrode pair and the first panel, and the material between the electrode pair is removed to form the depression. The method for manufacturing a surface discharge type display device according to claim 33, wherein the display device is formed. 35. The method for manufacturing a surface discharge type display device according to claim 34, wherein a sandblast method is used as a method of forming the depression in the second step. 36. The method according to claim 34, wherein a material of said first dielectric layer is formed on said electrode pair and said first panel surface in a layered manner in said second step. 3. The method for manufacturing a surface discharge type display device according to item 1.