JP2006120583A - Gas discharge display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP which has a long lifetime of a protection layer and less variation in luminance by preventing adhesion of impurities to the protection layer during the manufacturing process or after the manufacturing of the PDP. <P>SOLUTION: This is a gas discharge display device in which a discharge gas is filled in an inner space of a sealed container, and in the sealed container, a data electrode 26 is arranged at one component interposing the inner space and a belt-shape pair of display electrodes 12 are arranged at the other component, and a protection layer 40a is formed on a surface facing the inner space at the other component. The protection layer 40a comprises a first protection region 17a and a second protection region 18a mutually facing the inner space, the first protection region 17a having a higher discharge performance than that of the second protection region 18a, the second protection region 18a having a higher impurity adsorption prevention function than that of the first protection region 17a, and it is arranged in a state of covering at least a part of the arrangement portion of the pair of display electrodes 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to the structure of a protective layer in a gas discharge display device.

In recent years, a plasma display panel (hereinafter referred to as “PDP”) has become widespread as a self-luminous image display device because it can manufacture a large and thin panel relatively easily. There are two types of PDP: AC type (AC type) and DC type (DC type), but AC type PDP is the mainstream in terms of reliability and image quality.
Generally, an AC type PDP is manufactured by enclosing a discharge gas in an internal space formed by bonding a front panel and a rear panel. The front panel is manufactured by forming a pair of display electrodes on a front glass substrate, covering the dielectric layer thereon, and further forming a protective layer thereon.

Since the dielectric layer is not easily sputtered by electric discharge, a method of forming a protective layer mainly composed of magnesium oxide (hereinafter referred to as “MgO”) having high sputtering resistance is used to protect the dielectric layer. It has been. Since MgO has a high secondary electron emission coefficient, it has the effect of lowering the discharge start voltage during PDP driving, and is excellent in terms of lowering power consumption.
However, MgO easily adsorbs impurity gases such as moisture and carbon dioxide, and causes chemical changes with these, and easily changes to compounds such as magnesium hydroxide and magnesium carbonate. This compound is significantly inferior in sputtering resistance and secondary electron emission coefficient compared with MgO. That is, when MgO is transformed into magnesium hydroxide or magnesium carbonate by adsorbing impurity gas in the atmosphere, the effectiveness as the protective layer is lost. In addition, moisture remaining in the internal space in which the discharge gas is sealed (hereinafter referred to as “discharge space”) is adsorbed by the protective layer, so that its surface resistance is lowered, and wall charges can be retained when the panel is driven. This will cause black noise and brightness variations.

Therefore, by forming a second protective layer made of a metal fluoride on the first protective layer containing MgO as a main component, the adsorption of impurities on the surface of the first protective layer during the PDP manufacturing process is prevented, Furthermore, a method of ensuring the secondary electron emission coefficient of MgO at the time of PDP driving (for example, Patent Document 1) or a conventional protective layer by removing all of the second protective layer by plasma discharge or the like after PDP manufacture. A method of preventing the adsorption of impurities to the region while forming a protective layer of the same material but having different crystallinity so as to cover and maintaining the protective layer region having a high secondary electron emission coefficient (for example, patents) Reference 2) is being studied.
Japanese Patent Laid-Open No. 10-149767 Japanese Patent Laid-Open No. 2003-22755

  However, after the PDP is manufactured, the impurities are not completely removed in the discharge space. Therefore, after the PDP is manufactured, the second protective layer is removed and the first protective layer made of MgO is discharged. When exposed to the space, the secondary electron emission coefficient during driving of the PDP is ensured, and the exposed surface of the protective layer made of MgO reacts with impurities remaining in the discharge space, resulting in magnesium hydroxide or magnesium carbonate. It will be altered. This makes it difficult for the protective layer made of MgO to maintain the sputtering resistance.

Further, as a result of the examination of the above problems by the present inventors, in the protective layer formed in a state of covering the dielectric layer, the portion where the display electrode pair is disposed due to the damage caused by the discharge during the panel driving is cut off. Became clear.
In addition, there is a method of extending the life of the protective layer by adopting a two-layer structure of the same material with different crystal density, but in practice it is only possible to control the crystal structure of the protective layer. It is difficult to stabilize the protective layer.

  In view of the above-described problems, the present invention provides a gas discharge display device with a longer life of the protective layer and less luminance variation by preventing impurities from adhering to the protective layer during and after the manufacturing process of the gas discharge display device. The purpose is to do.

Therefore, the present invention adopts the following means.
The inner space of the sealed container is filled with a discharge gas, and in the sealed container, a data electrode is disposed on one component portion sandwiching the inner space, and a strip-shaped display electrode pair is disposed on the other component portion. And a protective layer is formed on the surface of the other component facing the internal space, wherein the protective layer includes a first protective region and a second protective region facing the internal space. The first protection region has a higher discharge performance than the second protection region, the second protection region has a higher impurity adsorption prevention function than the first protection region, The display electrode pair is disposed in a state of covering at least part of the portion where the display electrode pair is disposed.

The protective layer is disposed in each of the first protective region and the second protective region in a state where the second protective region overlaps a part of the first protective region, and the display electrode pair is arranged. It is preferable that the first protection region is arranged in a state where the first protection region faces the internal space in a portion that is not provided.
Moreover, it is preferable that the said protective layer is comprised from said 1st protection area | region which has a recessed part in the arrangement | positioning area | region of the said display electrode pair, and said 2nd protective area | region which exists in the said recessed part.

The second protection region preferably extends in the longitudinal direction of the display electrode pair and has a stripe shape.
Preferably, the second protection region has a perforated portion, and the perforated portions are arranged in a matrix along the main surface direction of the display electrode pair.
The protective layer preferably has the first protective region between the second protective regions, while the second protective region is present in a state of covering the portion where the display electrode pair is disposed.

The first protective region is preferably made of magnesium oxide and has a thickness of 600 nm to 2,000 nm, and the second protective region is preferably made of magnesium fluoride and has a thickness of 30 nm to 600 nm.
It is desirable that the second protective region has a characteristic of transmitting visible light, is formed of a material made of a metal fluoride, or is formed of a material made of SiN or SiO ₂ . The discharge gas preferably includes Xe at a partial pressure of 10% or more.

  In the present invention, the protective layer has a first protective region that faces the discharge space and has a high discharge property and a second protective region that has a high function of preventing impurity adsorption, and the second protective region is a pair of display electrodes. Adsorption prevention of impurities is made as a configuration covering at least a part of the arrangement portion. As a result, compared to the conventional case where the protective layer is composed of only the first protective region, as described above, the sputter resistance is reduced particularly on the display electrode pair arrangement portion when the panel is driven. Therefore, it is possible to improve the sputtering resistance by providing the second protective region on the portion. Thereby, it can suppress that the impurity in the discharge space after PDP manufacture changes the 1st protection region.

Further, in the portion where the second protection region is not disposed, the first protection region is disposed so as to face the discharge space, so that the panel drive can be performed without removing the second protection region after the panel is manufactured. The secondary electron emission coefficient at the time can be secured.
As described above, the spatter resistance of the protective layer is not deteriorated not only during the manufacturing process of the gas discharge display device typified by the PDP but also after the manufacturing, and the protective layer is not driven when the gas discharge display device is driven. A secondary electron emission coefficient can be secured. As a result, the function as the protective layer can be sufficiently achieved, the life deterioration of the gas discharge display device can be suppressed, and a gas discharge display device with little black noise and luminance variation can be realized.

  This is because, as described above, the protective layer including the second protective region prevents the first protective region made of MgO from being transformed into magnesium hydroxide or magnesium carbonate. This is because the spatter resistance on the installed portion can be maintained and high discharge performance can be maintained by MgO.

Embodiments of a PDP according to the present invention will be described below with reference to the drawings. The embodiment described below is an example for explaining the characteristics of the configuration and operation of the present invention, and the present invention is not limited to this.
(Example 1)
(PDP overall structure)
First, the overall configuration of the AC surface discharge type PDP will be described with reference to FIG. FIG. 1 is a perspective view of main parts of an AC surface discharge type PDP 100. FIG. The PDP 100 is sealed with the front panel 10 and the rear panel 20 facing each other with the discharge space 30 in between.
(1) Front panel 10
The front panel 10 includes a front substrate 11, transparent electrodes 13a and 13b, bus electrodes 14a and 14b, a dielectric layer 16, and a protective layer 40a.

  The front substrate 11 is made of high strain point glass or soda lime glass, and a plurality of pairs of ITO transparent electrodes 13a and 13b are formed in a stripe shape extending in the Y direction. Further, Ag bus electrodes 14a and 14b extending in the Y direction are disposed on the transparent electrodes 13a and 13b, whereby the scan electrodes 12a and the sustain electrodes 12b are formed, and a pair of display electrodes 12 is formed. As described above, the bus electrodes 14a and 14b of the metal film are disposed on the transparent electrodes 13a and 13b made of ITO having a high resistance value, thereby reducing the resistances of the scan electrode 12a and the sustain electrode 12b. The transparent electrodes 13a and 13b are made of tin oxide (SnO) or zinc oxide (ZnO). The bus electrodes 14a and 14b are made of Ag, a metal film made of aluminum or the like, or chromium (Cr). A laminated film of / copper (Cu) / chromium (Cr) is also applicable.

A dielectric layer 16 made of low-melting glass is formed by sputtering so as to cover the electrode group. A protective layer 40a is formed so as to cover the dielectric layer 16.
The protective layer 40a includes a layered first protective region 17a mainly composed of MgO and a layered second protective region 18a mainly composed of magnesium fluoride (hereinafter referred to as “MgF ₂ ”). A layer 40a is formed. The configuration of the protective layer 40a will be described later.
(2) Rear panel 20
The back panel 20 includes a back substrate 21, a data electrode 26, a dielectric layer 23, a partition wall 24, and a phosphor layer 25.

The back substrate 21 is made of high strain point glass or soda lime glass, and a plurality of data electrodes 26 for writing data are arranged in parallel on the back substrate 21 in the X direction.
A dielectric layer 23 is formed on the back substrate 21 by screen printing so as to cover these data electrodes 26.
In the region between the data electrodes 26 on the dielectric layer 23, barrier ribs 24 extending in the X direction are formed in stripes, and on the inner surface between the barrier ribs 24 and the surface of the dielectric layer 23 sandwiched between the barrier ribs 24, A phosphor film 25 having three colors of red (R), green (G), and blue (B) is applied. The phosphor film 25 is formed by repeatedly using, for example, the following color phosphors in the order of R, G, and B.

R phosphor; (Y, Gd) BO ₃ : Eu
G phosphor; Zn ₂ SiO ₄ : Mn
B phosphor; BaMg ₂ Al ₁₄ O ₂₄ : Eu
(3) Discharge space 30
The front panel 10 and the back panel 20 are disposed so as to face each other so that the display electrode pair 12 and the data electrode 22 are orthogonal to each other, and are thus sealed by two adjacent partition walls 24. A plurality of are formed. The discharge space 30 is evacuated, and a discharge mixed gas composed of Ne and Xe is enclosed to complete the PDP. This discharge gas preferably contains Xe at a partial pressure of 10% or more for the purpose of emitting a large amount of ultraviolet rays and increasing the luminous efficiency.

As described above, the discharge space 30 is partitioned by the barrier ribs 24, thereby preventing erroneous discharge and optical crosstalk. In the PDP 100, a discharge cell (not shown) is formed at a location where the display electrode pair 12 and the data electrode 26 intersect three-dimensionally. The PDP 100 has a plurality of discharge cells arranged in a matrix. With the above-described configuration, wall charges are formed on the surface of the protective layer 40a on the front panel 10 in accordance with the write data in the region where the data electrode 26 and the display electrode pair 12 intersect at the time of write discharge. During the sustain discharge, the sustain discharge occurs in the region where the wall charges are present, and the emitted ultraviolet light excites the phosphor film 25 to emit visible light. In the region where no wall charge exists, the sustain discharge does not occur and the display is black.
(Configuration of protective layer 40a)
Here, the states of the first protection region 17a and the second protection region 18a in the protection layer 40a described above will be described with reference to FIG. 2 (a) is an XZ plan view of the PDP 100 in FIG. 1, and FIG. 2 (b) is an XY plan view as seen from the position D in FIG. 2 (a). The first protection area 17a and the second protection area 18a are hatched for convenience.

As shown in FIG. 2 (a), a first protective region 17a made of MgO having a high secondary electron emission coefficient and high sputtering resistance is formed so as to cover the entire surface of the dielectric layer 16. On the surface of the first protection region 17a on the discharge space 30 side (the negative direction side in the Z direction), as shown in FIG. 2 (b), the second protection region 18a extends in the Y direction, In FIG. 5, the display electrode pair 12 is disposed so that the portion where the display electrode pair 12 is disposed and the portion where the second protection region 18a is formed overlap. This second protection region 18a is mainly composed of MgF ₂ and has lower sputter resistance and secondary electron emission coefficient than MgO, but has high water repellency and high water repellency impurity adsorption prevention function, There is no alteration to magnesium hydroxide or magnesium carbonate. As a result, MgO can be prevented from being altered on the portion where the display electrode pair 12 is disposed, which is a portion contributing to discharge. At the same time, as the present inventor found out, the first discharge region made of MgO on the arrangement portion is prevented from being scraped by being damaged by the discharge at the time of driving the panel. In addition, since the first protection region 17a is exposed to the discharge space 30 between the scan electrode 12a and the sustain electrode 12b constituting the display electrode pair 12, it suppresses a decrease in the discharge performance of the PDP 100 due to secondary electron emission. You can also Therefore, compared to the case where the protective layer 40a is composed only of the first protective region 17a, the above structure maintains the same level of discharge performance not only during the PDP manufacturing process but also after the manufacturing, while maintaining the spatter resistance. The effect which improves can be acquired.

The thicknesses of these regions are, for example, 600 nm for the first protection region 17a and 30 to 40 nm for the second protection region 17a. However, the thickness of the layer is not limited to this, and any layer having a function as a protective layer may be used. The second protective region 18a is mainly composed of MgF ₂ , but is not limited to this, and may be made of other highly water-repellent materials or highly hydrophobic materials.

In the present embodiment, the first protection region 17a is not covered with the second protection region 18a in the portion where the display electrode pair 12 is not disposed, but a part of the first protection region 17a is the discharge space 30. As long as the second protective region is exposed to the surface, the second protective region may be formed also in the portion where it is not disposed.
(PDP100 drive method)
Next, a method for driving the PDP 100 will be described with reference to FIG. FIG. 3 shows a method of dividing one field into eight subfields SF1 to SF8 in order to express, for example, 256 gray scales using the intra-field time division gray scale display method. The hatched area indicates the writing period. Although not shown in the drawings, a driver is connected to each of the electrodes 12a, 12b, and 26 of the PDP 100, and a circuit unit for driving these is connected. This is a publicly known one, and the description thereof is also omitted.

  As shown in FIG. 3, in the driving method of PDP 100 according to the present embodiment, one field is divided into eight subfields SF1 to SF8, and the luminance phase ratio of each subfield is 1: 2: 4: 8: The number of sustain pulses is set to be 16: 32: 64: 128. By controlling lighting / non-lighting of each of the subfields SF1 to SF8 according to display luminance data, 256 gradations can be displayed with a combination of eight subfields. In this embodiment, control is performed with 256 gradations, but the present invention is not limited to this.

  Each subfield includes an initialization period T1 to which a certain time is allocated, a writing period T2, and a sustain period T3 set with a length of time corresponding to the relative ratio of luminance. For example, when performing display driving of the PDP 100 according to the present embodiment, first, in the initialization period T1, an initializing discharge is generated in all the discharge cells of the PDP 100, and thereby a subframe before the subframe is generated. Initialization is performed in order to remove the influence of the discharge performed in step 1 and to absorb variations in discharge characteristics.

Each of the electrodes 12a, 12b, 26 is applied with voltage pulses 1001, 1002, 1003 having waveforms set for each period T1 to T3.
In the write period T2, based on the subfield data, the scan electrode 12a is sequentially scanned for each line, and a discharge cell that is to be sustained and discharged in the subfield has a minute amount between the scan 12a and the data electrode 26. Discharge (address discharge) is generated. Thus, in the discharge cell in which a minute discharge is generated between the scan electrode 12a and the data electrode 12b, wall charges are stored on the surface of the protective layer 40a of the front panel 10.

  After that, in the sustain period T3, voltage pulses 1001 and 1002 having an AC waveform are applied to the sustain electrode 12b and the scan electrode 12a of all the discharge cells, so that the discharge cells that are written in the write period T2 are maintained in the discharge cells. Discharge occurs. Here, the voltage pulses 1001 and 1002 in the sustain period T3 have the same period, and their phases are shifted by a half period. Further, the discharge start voltage in the PDP 100 is about 125 V, which is lower than that of the conventional PDP.

In the sustain period T3, the voltage pulse applied to the data electrode 12a is set to zero potential, and a so-called thin line pulse may be applied to the data electrode 26.
(Method for forming protective layer 40a)
Hereinafter, a method for forming the protective layer 40a, which is a characteristic feature of the present embodiment, among the methods for manufacturing the PDP 100 will be described with reference to FIG.

  As shown in FIG. 4, first, the front substrate 11 on which the display electrode pair 12 is formed on one main surface and the dielectric layer 16 made of lead-based low-melting glass is formed so as to cover the surface is formed. prepare. After the first protective region 17a made of MgO is formed over the entire surface of the dielectric layer 16 of the front substrate 11, a metal mask 2001 is disposed along the first protective region 17a. The metal mask 2001 is provided with a window 2001h at a portion corresponding to the formation portion of the second protection region 18a.

In an electron beam deposition apparatus, an MgF2 material target is irradiated and evaporated in an Ar / H2 gas atmosphere into which an impurity hydrogen gas having a predetermined flow rate is introduced, and is passed through a window portion 2001h of the metal mask 2001 to a predetermined region. Deposit two protected area materials.
As shown in FIG. 4, the protective layer 40a composed of the first protective region 17a and the second protective region 18a can be formed through the above process.

In the method for forming the protective layer 40a, the metal mask 2001 was used to form the second protective region 18a on the first protective region 17a, but the present invention is not limited to this method, and the photolithography method, You may use CVD method, sputtering method, or these in combination.
(Example 2)
PDP 100 different from (Example 1) in the above embodiment will be described with reference to FIG. However, the difference from (Example 1) is only the component part of the protective layer 40b, and the description of other parts is omitted. FIG. 5 (a) is an XZ sectional view of the PDP 100, and FIG. 5 (b) is an XY plan view seen from the position of the point D in FIG. 5 (a).
(Configuration of protective layer 40b)
The second protective region 18b made of MgF ₂ is formed on the portion where the display electrode pair 12 is disposed on the first protective region 17b made of MgO, but unlike (Example 1), FIG. As shown in a) and FIG. 5 (b), on the portion where the display electrode pair 12 is disposed, it extends in the Y direction and is formed in stripes in the X direction. Therefore, the first dielectric layer 17b has a plurality of regions 180b exposed to the discharge space 30 even on the portion where the display electrode pair 12 is provided. These exposed regions 180b have a width W and a height T on the XZ cross section, as shown in the enlarged view of FIG. 5 (a). Note that the values of the width W and the height T are not particularly limited, and the sputter angle a (see the enlarged view of FIG. 5 (a)) in the display electrode pair 12 is not close to 60 degrees. It doesn't matter. At the same time, the values of the plurality of widths W and heights T may be different for each location of the exposed area. As is apparent from FIG. 6 showing the sputtering rate with respect to the sputtering angle by the sustain discharge in the first protective region 17b made of MgO, this is expressed on the vertical axis if the sputtering angle expressed on the horizontal axis is around 60 degrees. This is because the sputter rate becomes extremely large.

As described above, the MgO that is the first protection region 17b is exposed to the discharge space 30 in a part of the portion where the display electrode pair 12 is disposed, so that the secondary electron emission coefficient is further increased.
As described above, even in the case of the present embodiment, it is possible to prevent the deterioration of MgO on the arrangement portion of the display electrode pair 12 which is a portion contributing to discharge, and greatly contribute to the extension of the life of the PDP.
(Example 3)
A PDP 100 different from (Example 1) and (Example 2) in the above embodiment will be described with reference to FIG. However, the different parts are the constituent parts and the forming method of the protective layer 40c, and the explanation of the other parts is omitted. FIG. 7 is an XZ sectional view of the PDP 100, and the XY plan view seen from the position of the point D is the same as FIG.
(Configuration of protective layer 40c)
In the present embodiment, a protective layer 40c composed of a first protective region 17c made of MgO and a second protective region 18c made of MgF ₂ is formed so as to cover the dielectric layer 16. However, unlike (Example 1) and (Example 2), the first protection region 17c has a recessed portion in the thickness direction (the positive direction side in the Z direction) in the portion where the display electrode pair 12 is disposed. A second protection region 18c is formed in the recessed portion.

In the present embodiment, the second protective region 18c is formed in the arrangement portion of the display electrode pair 12 so as to cover the first protective region 17c, and sufficiently functions as the protective layer 40c. It has a structure that greatly contributes to the realization.
(Method for forming protective layer 40c)
Hereinafter, a method for forming the protective layer 40c will be described with reference to FIG.

Similarly to (Example 1), after forming the first protective region 17c1 made of MgO over the entire surface of the dielectric layer 16 of the front substrate 11, a metal mask 3001 is disposed along the first protective region 17c1. The metal mask 3001 is provided with a window 3001h in addition to a portion corresponding to the formation portion of the second protection region 18a.
The front substrate 11 provided with the metal mask 3001 is set in an electron beam deposition apparatus, and an electron beam is irradiated and deposited on a high-purity MgO material target in Ar gas, and further on the first protection region 17c1 through the window 3001h. Deposit one protected area material. At this time, the vapor deposition conditions are such that the thickness of the first protection region 17c is about 600 nm.

  Next, as shown in FIG. 9 (b), a metal mask 4001 is placed along the side where the first protection region 17c is formed with respect to the front substrate 11 where the first protection region 17c is formed with a required pattern. Distribute. The metal mask 4001 is provided with a window 4001h corresponding to the pattern of the second protection region 18c to be formed. Then, in the electron beam evaporation apparatus, in an Ar / H2 gas atmosphere into which an impurity hydrogen gas having a predetermined flow rate is introduced, an electron beam is irradiated and evaporated onto the MgF2 material target, and a predetermined region is passed through the window 4001h of the metal mask 4001. And depositing a second protective region material.

As shown in FIG. 9, the protective layer 40c composed of the first protective region 17c and the second protective region 18c can be formed through the above process.
In the method of forming the protective layer 40c, the protective layer 40c is formed using the metal masks 3001 and 4001, but the present invention is not limited to this method, and the photolithography method, the CVD method, the sputtering method, or these May be used in combination.
(Example 4)
PDP 100 different from (Example 1) to (Example 3) in the above embodiment will be described with reference to FIG. However, different portions are components of the protective layer 40d, and description of other portions is omitted. FIG. 8 is an XZ sectional view of the PDP 100, and the XY plan view seen from the position of the point D is the same as FIG.
(Configuration of protective layer 40d)
Also in this embodiment, a protective layer 40d including a first protective region 17d made of MgO and a second protective region 18d made of MgF ₂ is formed so as to cover the dielectric layer 16. However, the first protection region 17d is interposed between the arrangement portions of the display electrode pair 12, and the second protection region 18d is formed in the arrangement region.

In the present embodiment, the layer made of MgO is not formed in the portion where the display electrode pair 12 is disposed, but the second protective region 18d made of MgF ₂ is formed, which greatly reduces the secondary electron emission coefficient. Are not connected. In addition, since the function of preventing the adsorption of impurities is high, it is possible to prevent the function of the protective layer 40d from being deteriorated in the arrangement portion that contributes to the discharge. Therefore, as in the above-described embodiment, it can be used to extend the life of the PDP 100.
(Other matters)
The above embodiment is used as an example for explaining the characteristics of the present invention, and the present invention is not limited thereto. For example, in the driving method of FIG. 3, the voltage pulse is not applied to the data electrode 26 in the sustain period T3. However, a so-called sustain data pulse may be applied.

In the above embodiment, the barrier ribs 24 of the back panel 20 are formed in a stripe shape, but may be formed in a cross-beam shape, or a priming discharge subcell may be provided between adjacent discharge cells.
Further, in the present embodiment, the second protective region is positioned on the portion where the display electrode pair 12 is disposed, but the second protective region is formed at least within a range covering the portion where the display electrode pair 12 is disposed. As long as the display electrode pair 12 is not disposed, the display electrode pair 12 may be disposed outside. However, it is desirable that at least a part of the first protection region be exposed to the discharge space 30 at that time.

The discharge gas is not limited to the one containing Xe at a partial pressure of 10% or more, but other configurations may be used as long as they emit a lot of ultraviolet rays and increase the luminous efficiency of the PDP100. Absent.
In the above embodiment, the sealed container is formed by bonding the front panel 10 and the back panel 20, but it is not necessarily intended only for the PDP formed by bonding two panels. For example, it can also be set as the structure which forms a some discharge cell with a tube-shaped airtight container.

The thicknesses of the first protective region and the second protective region are not limited to those described in the present embodiment. The first protective region is 600 nm to 2,000 nm and the second protective region is 30 nm to 600 nm. If it is okay. The material for the first protection region is not limited to MgO, and any material can be used as long as the same effect can be obtained. The material of the second protection region may be formed of a material that can transmit visible light, a material made of a metal fluoride having water repellency, or a material made of SiN or SiO ₂ having hydrophobicity.

  The present invention can provide a stable protective layer during and after the PDP manufacturing process, and is useful for realizing a highly durable PDP display device.

1 is an exploded perspective view showing an AC surface discharge type PDP according to an embodiment. (a) is XZ sectional drawing of PDP100 in Example 1, (b) is the top view seen from the point D in (a). FIG. 4 is a pulse diagram applied to each electrode 12a, 12b, and 26 when the PDP 100 is driven. FIG. 4 is a process diagram showing processes related to formation of the protective layer 40a of the front panel 10 in the manufacturing process of the PDP 100 in Example 1. (a) is XZ sectional drawing of PDP100 in Example 2, (b) is the top view seen from the point D in (a). 7 is a graph showing the relationship between the sputtering angle to the first protection region 17b and the sputtering rate. 6 is an XZ sectional view of PDP 100 in Example 3. FIG. 6 is an XZ sectional view of PDP 100 in Example 4. FIG. FIG. 10 is a process diagram showing processes related to formation of the protective layer 40a of the front panel 10 among the manufacturing processes of the PDP 100 in Example 3.

Explanation of symbols

10 Front panel
11 Front glass substrate
12 Display electrode pair
12a scan electrode
13a Sustain electrode
16 Dielectric layer
17a First protected area
18a Second protected area
13a, 13b Transparent electrode
14a, 14b Metal bus electrode
20 Back panel
21 Rear glass substrate
23 Dielectric layer
24 Bulkhead
25 Phosphor film
26 Data electrode

Claims (11)

The inner space of the sealed container is filled with a discharge gas, and in the sealed container, a data electrode is disposed on one component portion sandwiching the inner space, and a strip-shaped display electrode pair is disposed on the other component portion. And a gas discharge display device in which a protective layer is formed on the surface facing the internal space in the other component part,
The protective layer has a first protective region and a second protective region facing the internal space,
The first protection region has a higher discharge performance than the second protection region,
The gas discharge is characterized in that the second protective region has a higher function of preventing the adsorption of impurities than the first protective region and covers at least a part of a portion where the display electrode pair is disposed. Display device. The protective layer is disposed in each of the first protective region and the second protective region in a state where the second protective region overlaps a part of the first protective region, and the display electrode pair is arranged. 2. The gas discharge display device according to claim 1, wherein the first protection region is disposed in a portion that is not provided so as to face the internal space. 3. The protective layer according to claim 2, wherein the protective layer includes the first protective region having a recessed portion in an arrangement region of the display electrode pair, and the second protective region existing in the recessed portion. Gas discharge display device. 3. The gas discharge display device according to claim 2, wherein the second protection region extends in the longitudinal direction of the display electrode pair and has a stripe shape. There is a perforated portion in the second protection area,
3. The gas discharge display device according to claim 2, wherein the perforations are arranged in a matrix along the main surface direction of the display electrode pair. 2. The protective layer according to claim 1, wherein the protective layer is present in a state where the second protective region covers an arrangement portion of the display electrode pair, and the first protective region is provided between the second protective regions. The gas discharge display device as described. The first protection region is made of magnesium oxide and has a thickness of 600 nm to 2,000 nm,
7. The gas discharge display device according to claim 1, wherein the second protection region is made of magnesium fluoride and has a thickness of 30 nm to 600 nm. 7. The gas discharge display device according to claim 1, wherein the second protective region transmits visible light. 7. The gas discharge display device according to claim 1, wherein the second protection region is formed of a material made of a metal fluoride. 7. The gas discharge display device according to claim 1, wherein the second protection region is formed of a material made of SiN or SiO ₂ . 11. The gas discharge display device according to claim 1, wherein the discharge gas contains Xe at a partial pressure of 10% or more.

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