JP2007157485A - Plasma display panel and manufacturing method of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a PDP capable of exerting excellent discharging efficiency and image layer displaying property by an improvement of a protection layer. <P>SOLUTION: The protection layer 15 having a lamination structure of a lower layer of MgO 15b and an upper layer of MgO 15a is formed on a surface of a front panel 10. Secondary electron emission coefficient of the upper layer MgO 15a is made smaller than that of the lower layer MgO 15b. It is constructed so that areas 26 of the upper layer MgO 15a where the display electrodes 12, 13 crossover address electrodes 18 with discharging spaces 24 interposed, on a view in a direction perpendicular to the panel, are removed. The removal of the crossover areas 26 is performed simultaneously with an aging process in the manufacturing process. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plasma display panel and a method for manufacturing the same, and more particularly to a protective layer and a method for forming the same.

A plasma display panel (hereinafter referred to as PDP) is a display device that displays an image by exciting and emitting phosphors with ultraviolet rays generated by gas discharge. PDP can be classified into alternating current (AC) type and direct current (DC) type based on the discharge formation method, but AC type is superior to DC type in terms of brightness, luminous efficiency, and life, so this type. Is the most common.
For example, as disclosed in Patent Document 1, an AC type PDP has a plurality of thin panel glass surfaces each having a plurality of electrodes (display electrodes or address electrodes) and a dielectric layer disposed so as to cover the electrodes. In the state where the phosphor layers are arranged between the plurality of partition walls and the discharge cells are formed in a matrix, a discharge gas is sealed between the two panel glasses. A protective layer (film) is formed on the surface of the dielectric layer covering the display electrodes.

In PDP, based on a so-called time-division gray scale display method during driving, power is appropriately supplied to the plurality of electrodes in a plurality of subfields (including an initialization period, an address period, a sustain period, etc.), Fluorescence is emitted by ultraviolet rays generated by obtaining a discharge.
Here, the material of the protective layer of the front panel glass is required to have a function of generating discharge at a low discharge start voltage while protecting the dielectric layer from ion bombardment during discharge. For this purpose, as a protective layer of PDP, as disclosed in Patent Document 2, a material mainly composed of magnesium oxide (MgO) having excellent sputter resistance and a large secondary electron emission coefficient is widely used. Yes.

  Here, the conventional PDP has problems in image display performance, such as improvement in light emission efficiency when compared with a CRT display. As a countermeasure against this, there is known a method for improving the luminance by increasing the Xe concentration in the discharge gas. On the other hand, however, increasing the Xe concentration in the discharge gas also causes an increase in drive voltage, which causes power consumption problems, and the discharge scale is increased to an unnecessary level, causing unnecessary interaction between the barrier ribs and the discharge. It is difficult to obtain ideal discharge efficiency. Further, when an unnecessary increase in the discharge scale occurs, the interference between adjacent cells increases, which may cause a deterioration in image quality such that a non-lighted cell is turned on accidentally.

Thus, for example, Patent Document 2 discloses that a material having different discharge characteristics has a two-layer structure, thereby forming a protective layer to solve the above problem.
JP 2002-150953 A Japanese Patent Laid-Open No. 2001-229836

However, in the technique of Patent Document 2, the protective layer having a two-layer structure is formed by laminating an upper layer made of a material other than MgO (SiO ₂ , Al ₂ O _3, etc.) on a lower layer made of MgO. For this reason, there has been a problem that material components other than MgO are mixed in the MgO layer during driving due to material characteristics, and the discharge characteristics of MgO change with time.
In addition, in order to obtain the above configuration with the technique of Patent Document 2, it is necessary to coat the material once entirely over the panel surface and then pattern the upper layer region to form a desired pattern. Is done. As a result, the number of processes increases and the panel manufacturing process becomes complicated, as well as a cost problem.

As described above, there is still room to be solved in the technical field of PDP.
The present invention has been made in view of the above problems, and provides a PDP capable of exhibiting excellent discharge efficiency and image display performance while having a relatively low cost, and a method for manufacturing the PDP. There is.

  In order to solve the above-described problems, the present invention is configured such that a front panel having a plurality of pairs of display electrodes formed on a substrate surface and a back panel having a plurality of address electrodes formed on the substrate surface are opposed to each other across a discharge space. A PDP having a protective layer formed on the front panel surface facing the discharge space, the protective layer comprising a first layer containing MgO as a main component and a secondary electron emission coefficient higher than that of the first layer. A second layer containing low MgO as a main component is sequentially laminated, and when viewed from the vertical direction of the panel, the second layer includes a display electrode pair and the address electrode over a discharge space. And formed in the region excluding the crossover region.

  In the present invention, a front panel in which a plurality of pairs of display electrodes are formed on a substrate surface and a back panel in which a plurality of address electrodes are formed on the substrate surface are arranged opposite to each other across the discharge space so as to face the discharge space. A method of manufacturing a PDP in which a protective layer is formed on a front panel surface, wherein in the protective layer forming step of the front panel, a first layer material containing MgO as a main component on the front panel substrate, and the first layer A stacking step of sequentially stacking a second layer material containing MgO as a main component having a lower secondary electron emission coefficient than the display electrode pair and the address electrode when viewed from the vertical direction of the panel. A protective layer is formed through a second layer patterning step of patterning the second layer material so that the second layer material is laminated in a region excluding the crossover region with a space. It was supposed to be.

Here, the second layer patterning step includes an aging step, and in the stacking step, the second layer material is uniformly stacked on the first layer, and then in the second layer patterning step, The portion of the second layer material in the crossover region may be deleted by the aging process.
Further, the aging process may be performed using an etching gas having a higher MgO etching rate than the discharge gas introduced into the PDP, and the etching gas may be replaced with the discharge gas after the aging process is completed.

In the PDP of the present invention having the above configuration, a protective layer is not formed using a different material as in Patent Document 2, but a layer having a different secondary electron emission coefficient is formed in a laminated structure using an MgO material. As described above, since the laminated structure materials of the protective layer are mainly composed of MgO, there is no problem of performance deterioration due to mixing of different materials as in Patent Document 2.
Also, when viewed from the direction perpendicular to the panel, the second layer is provided to avoid the region where the display electrode and the address electrode cross over the discharge space, so that the discharge concentrates in the crossover region. And unnecessary interaction with the barrier ribs is eliminated in the discharge during the sustain discharge.

That is, the first layer having a high secondary electron emission coefficient is exposed in the region where the second layer is not provided, and the discharge tends to concentrate in this region. Creeping discharge is restricted. As a result, the Xe partial pressure in the discharge gas can be increased to achieve high efficiency, and the image quality can be maintained well.
Moreover, if the manufacturing method of this invention is utilized, since patterning of an upper layer can be performed with an aging process, it can implement, without preparing a special process separately. For this reason, PDP can be manufactured efficiently at relatively low cost.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<Embodiment 1>
1-1. Configuration of PDP FIG. 1 is a partial cross-sectional perspective view showing the main configuration of AC type PDP 1 according to Embodiment 1 of the present invention. In the figure, the z direction corresponds to the thickness direction of the PDP 1, and the xy plane corresponds to a plane parallel to the panel surface of the PDP 1. The PDP 1 has a specification that conforms to the 42-inch class NTSC specification as an example here, but the present invention may be applied to other specifications and sizes such as XGA and SXGA.

As shown in FIG. 1, the configuration of the PDP 1 is roughly divided into a front panel 10 and a back panel 16 that are disposed with their main surfaces facing each other.
A front panel glass 11 serving as a substrate of the front panel 10 has a plurality of pairs of display electrodes 12 and 13 (scan electrodes 12 and sustain electrodes 13) formed on one main surface thereof. Each of the display electrodes 12 and 13 is made of an Ag thick film (thickness 2 μm to 10 μm) with respect to the strip-shaped transparent electrodes 120 and 130 (thickness 0.1 μm, width 150 μm) made of a transparent conductive material such as ITO or SnO ₂ , Bus lines 121 and 131 (thickness 7 μm, width 95 μm) made of aluminum (Al) thin film (thickness 0.1 μm to 1 μm) or Cr / Cu / Cr laminated thin film (thickness 0.1 μm to 1 μm) are laminated. The bus lines 121 and 131 reduce the sheet resistance of the transparent electrodes 120 and 130.

The front panel glass 11 on which the display electrodes 12 and 13 are disposed has lead oxide (PBO), bismuth oxide (Bi ₂ O ₃ ), or phosphorus oxide (PO ₄ ) as a main component over the entire main surface of the glass 11. A dielectric layer 14 of low melting glass (thickness 20 μm to 50 μm) is formed by a screen printing method or the like. The dielectric layer 14 has a current limiting function peculiar to the AC type PDP, and is an element that realizes a longer life than the DC type PDP. The surface of the dielectric layer 14 is coated with a protective layer 15 having a thickness of about 1.0 μm.

Here, the feature of the first embodiment is the configuration of the protective layer 15, which will be described in detail later.
The back panel glass 17 serving as the substrate of the back panel 16 has an Ag thick film (thickness 2 μm to 10 μm), an aluminum (Al) thin film (thickness 0.1 μm to 1 μm) or a Cr / Cu / Cr laminated thin film on one main surface. A plurality of address electrodes 18 having a width of 60 μm (thickness of 0.1 μm to 1 μm) are arranged in stripes at regular intervals (360 μm) in the y direction with the x direction as a longitudinal direction, and the address electrodes 18 are included. Thus, the dielectric film 19 having a thickness of 30 μm is coated over the entire surface of the back panel glass 17.

  On the dielectric film 19, a partition wall 20 (height of about 150 μm and width of 40 μm) is arranged in accordance with the gap between the adjacent address electrodes 18, and the cell SU is partitioned by the adjacent partition wall 20, and in the x direction. It serves to prevent the occurrence of erroneous discharge and optical crosstalk. The phosphor layers 21 corresponding to red (R), green (G), and blue (B) for color display are disposed on the side surfaces of two adjacent barrier ribs 20 and the surface of the dielectric film 19 therebetween. ~ 23 are formed.

The address electrode 18 may be directly included in the phosphor layers 21 to 23 without using the dielectric film 19.
The front panel 10 and the back panel 16 are arranged so that the longitudinal directions of the address electrode 18 and the display electrodes 12 and 13 are orthogonal to each other, and the outer peripheral edge portions of both the panels 10 and 16 are sealed with glass frit. ing. A discharge gas (filled gas) made of an inert gas component such as He, Xe, or Ne is sealed between the panels 10 and 16 at a predetermined pressure (usually about 53.2 kPa to 79.8 kPa).

A space between adjacent barrier ribs 20 is a discharge space 24, and a region where a pair of adjacent display electrodes 12, 13 and one address electrode 18 intersect with each other across the discharge space 24 is a cell (“subpixel”) for image display. Also known as SU). The cell pitch is 1080 μm in the x direction and 360 μm in the y direction. One pixel (1080 μm × 1080 μm) is composed of three adjacent RGB cell SUs.
1-2. PDP Driving Method The PDP 1 having the above configuration is configured such that an AC voltage of several tens to several hundreds kHz is applied to the gap between the pair of display electrodes 12 and 13 by a driving unit (not shown). A discharge is generated in the SU, and the phosphor layers 21 to 23 are excited by ultraviolet rays from the excited Xe atoms so as to emit visible light.

  As an example of the driving method, there is a so-called in-field time division gradation display method. In this method, a field to be displayed is divided into a plurality of subfields, and each subfield is further divided into a plurality of periods. In each subfield, the wall charge of the entire screen is initialized (reset) in the initialization period, and then address discharge is performed to accumulate wall charges only in the discharge cells to be lit in the address period. By applying an alternating voltage (sustain voltage) to all the discharge cells all at once, the discharge is maintained for a certain period of time to display light.

  At the time of this drive, the drive unit expresses the light emission in each cell by gradation control by binary control of ON / OFF, and each time-series field F that is an input image from the outside, for example, six Divide into subfields. Weighting is performed so that the relative ratio of luminance in each subfield is, for example, 1: 2: 4: 8: 16: 32, and the number of times of sustain (sustain discharge) emission is set in each subfield.

Here, FIG. 2 is an example of the drive waveform process of the present PDP1. FIG. 2 shows the drive waveform of the mth subfield in the field. As shown in FIG. 2, an initialization period, an address period, a discharge sustain period, and an erase period are allocated to each subfield.
The initialization period is a period in which the wall charges of the entire screen are erased (initialization discharge) in order to prevent the influence of the previous lighting of the cells (the influence of the accumulated wall charges). In the waveform example shown in FIG. 2, a reset pulse having a positive ramp-down waveform exceeding the discharge start voltage Vf is applied to all the display electrodes 12 and 13. At the same time, a positive pulse is applied to all address electrodes 18 in order to prevent charging and ion bombardment on the back panel 16 side. Due to the differential voltage between the rising and falling edges of the applied pulse, an initializing discharge, which is a weak surface discharge, is generated in all cells, wall charges are accumulated in all cells, and the entire screen is uniformly charged.

  The address period is a period for performing addressing (setting of lighting / non-lighting) of a cell selected based on the image signal divided into subfields. In this period, the scan electrode 12 is biased to a positive potential with respect to the ground potential, and all the sustain electrodes 13 are biased to a negative potential. In this state, each line is selected one by one from the line at the top of the panel (a row of cells corresponding to a pair of display electrodes), and a negative scan pulse is applied to the corresponding scan electrode 12. Further, a positive address pulse is applied to the address electrode 18 corresponding to the cell to be lit. As a result, the weak surface discharge in the initialization period is inherited, address discharge is performed only in the cells to be lit, and wall charges are accumulated.

  The discharge maintaining period is a period in which the lighting state set by the address discharge is expanded and the discharge is maintained in order to ensure the luminance corresponding to the gradation. Here, in order to prevent unnecessary discharge, all the address electrodes 18 are biased to a positive potential, and a positive sustain pulse is applied to all the sustain electrodes 13. Thereafter, a sustain pulse is alternately applied to the scan electrode 12 and the sustain electrode 13, and the discharge is repeated for a predetermined period.

In the erasing period, a gradual pulse is applied to the scan electrode 12, thereby erasing the wall charges.
Note that the length of the initialization period and the address period is constant regardless of the luminance weight, but the length of the discharge sustain period is longer as the luminance weight is larger. That is, the length of the display period of each subfield is different from each other.

In PDP1, each discharge performed in the subfield generates a vacuum ultraviolet ray composed of a resonance line having a sharp peak at 147 nm caused by Xe and a molecular beam centered at 173 nm. This vacuum ultraviolet ray is irradiated to each of the phosphor layers 21 to 23 to generate visible light. Then, multi-color / multi-gradation display is performed by a combination of sub-field units for each RGB color.
(About the effect of the present invention)
Here, the feature of the first embodiment is the configuration of the protective layer 15 in the PDP 1. Fig. 3 (a) is a virtual electrode layout showing the crossover position of electrodes 12, 13, and 18 when looking down on PDP1 along the xy plane, and Fig. 3 (b) is a portion of PDP1 along the yz plane. It is an enlarged view.

First, as shown in FIG. 3 (b), the protective layer 15 is composed of a two-layer structure using an MgO material, and the lower layer MgO15b, which is the first layer, is almost the entire surface on the dielectric layer 14. Is formed over.
On the other hand, the upper layer MgO15a, which is the second layer, is made of a material having a secondary electron emission coefficient lower than that of the lower layer MgO15b, and is laminated on the lower layer MgO15b.

 As shown in FIGS. 3A and 3B, the upper layer MgO 15a includes the scan electrode 12, the sustain electrode 13, and the address electrode 18 across the discharge space 24 when the PDP 1 is looked down along the xy plane. It is formed so as to avoid a crossover region (crossover region 26). In this example, the upper layer MgO 15a is formed by uniformly laminating the upper layer material on the lower layer MgO 15b and then cutting off the portion of the upper layer material corresponding to the crossover region 26.

  According to the PDP of the present invention having the above-described configuration, a laminated structure similar to that of Patent Document 2 can be formed by forming the protective layer 15 with a laminated structure having layers having different secondary electron emission coefficients. In addition, since both of the materials of the laminated structure are mainly composed of MgO, even if the materials of the upper layer MgO15a and the lower layer MgO15b are mixed, the performance of the protective layer 15 is not greatly deteriorated. There is no performance degradation problem due to mixing of materials. As a result, there is no fluctuation in the discharge characteristics of MgO, and the effect of performing stable driving is achieved.

  Here, it is generally known that increasing the Xe concentration in the discharge gas can increase the discharge efficiency of the PDP. However, increasing the Xe concentration generally increases the discharge scale more than necessary, resulting in erroneous discharge. It tends to occur. On the other hand, in the first embodiment, since the upper layer MgO 15a is not provided in the region 26 where the display electrodes 12, 13 and the address electrode 18 cross over the discharge space 24, the discharge expands to the partition 20 portion. Can be suppressed. The “interaction” refers to the occurrence of unnecessary creeping discharge or other unintended discharge.

Furthermore, according to the present invention, such an interaction is effectively prevented, so that high efficiency can be achieved. In addition, by adopting a configuration that prevents such interaction, it is possible to prevent image quality degradation such as erroneous lighting of a non-lighted cell due to interaction with the adjacent cell SU.
In the present invention, as will be described below, patterning of the lower layer MgO 15b can be performed together with the aging process, and therefore can be performed without preparing a special process. For this reason, PDP can be manufactured efficiently at relatively low cost.

<PDP manufacturing method>
Here, an example of the method for manufacturing PDP 1 of the first embodiment, including the method for forming the protective layer of the present invention, will be described. Of course, the present invention is not limited to this manufacturing method.
(Preparation of front panel)
Display electrodes 12 and 13 are formed on the surface of a front panel glass 11 made of soda-lime glass having a thickness of about 2.6 mm. Here, an example in which the display electrodes 12 and 13 are formed by a printing method is shown, but other than this, it can be formed by a die coating method, a blade coating method, or the like.

  First, an ITO (transparent electrode) material is applied on the front panel glass in a predetermined pattern. This is dried. On the other hand, a photosensitive paste is prepared by mixing a photosensitive resin (photodegradable resin) with metal (Ag) powder and an organic vehicle. This is applied over the transparent electrode material and covered with a mask having a display electrode pattern to be formed. And it exposes from the said mask, and bakes with the baking temperature of about 590-600 degreeC through a image development process. As a result, bus lines 121 and 131 are formed on the transparent electrodes 120 and 130. According to this photomask method, the bus lines 121 and 131 can be thinned to a line width of about 30 μm as compared with the screen printing method in which the line width of 100 μm is conventionally limited. In addition, as the metal material of the bus line, Pt, Au, Ag, Al, Ni, Cr, tin oxide, indium oxide, or the like can be used.

In addition to the above method, the bus lines 121 and 131 can be formed by performing an etching process after forming an electrode material by vapor deposition or sputtering.
Next, a paste prepared by mixing a lead oxide or bismuth oxide dielectric glass powder having a softening point of 550 ° C. to 600 ° C. and an organic binder made of butyl carbitol acetate or the like on the formed display electrodes 12 and 13 is used. Apply. Then, firing is performed at about 550 ° C. to 650 ° C. to form the dielectric layer 14.

(About protective layer production process)
Subsequently, the protective layer 15 is formed by the following procedure. 4 and 5 are diagrams schematically illustrating the formation process of the protective layer 15. FIG.
First, an MgO film A is formed on the dielectric layer 14 with a predetermined thickness (about 1000 nm) by using an electron beam evaporation method (FIGS. 4A and 4B).

  After that, using an ion implanter, the MgO film A is irradiated with Ar ions, which are inert elements, to introduce defects into the MgO region about 50 nm deep from the surface (Figs. 4 (c) and (d) ). According to this method, irradiation with Ar ions, which are inert gas ions, causes defects in the surface layer A1 of the MgO film, and the secondary electron emission coefficient is higher than that of MgO that is not affected by the irradiation ions of the lower layer A2. It can be made smaller.

As a result, the upper layer MgO15a as the second layer is formed as a stacking step on the surface of the lower layer MgO15b as the first layer. At this point, the lower layer MgO15b is completely covered with the upper layer MgO15a.
Although the electron beam evaporation method is exemplified as a method for forming the MgO layer, the present invention is not limited to this, and other methods such as sputtering, ion plating, etc. are used for forming the MgO layer. May be used.

Thus, the basic configuration of the front panel 10 is produced.
(Production of back panel)
On the surface of the back panel glass 17 made of soda-lime glass with a thickness of about 2.6 mm, a conductive material mainly composed of Ag is applied in stripes at regular intervals by screen printing, and the address electrode has a thickness of about 5 μm. 18 is formed. Here, in order to set the PDP 1 to be manufactured to, for example, the 40-inch class NTSC standard or VGA standard, the interval between two adjacent address electrodes 18 is set to about 0.4 mm or less.

Subsequently, a lead-based glass paste is applied over the entire surface of the back panel glass 17 on which the address electrodes 18 are formed to a thickness of about 20 to 30 μm and baked to form the dielectric film 19.
Next, a partition 20 having a height of about 60 to 100 μm is formed on the dielectric film 19 between the adjacent address electrodes using the same lead-based glass material as that of the dielectric film 19. The partition wall 20 can be formed, for example, by repeatedly screen-printing a paste containing the glass material and then baking it. In the present invention, it is preferable that the lead-based glass material constituting the partition wall 20 contains a Si component because an effect of suppressing an increase in impedance of the protective layer 15 is enhanced. This Si component may be included in the chemical composition of the glass or added to the glass material. Further, an additive of impurities having a high vapor pressure (N, H, Cl, F, etc.) may be added in an appropriate amount in the form of gas in the gas phase during the formation of MgO.

Once the barrier ribs 20 are formed, either the red (R) phosphor, the green (G) phosphor, or the blue (B) phosphor is applied to the wall surfaces of the barrier ribs and the surface of the dielectric film 19 exposed between the barrier ribs. Fluorescent ink containing is applied, dried and fired to form phosphor layers 21 to 23, respectively.
The chemical composition of each RGB phosphor is, for example, as follows.
Red phosphor; Y ₂ O ₃ ; Eu ³⁺
Green phosphor; Zn ₂ SiO ₄ : Mn
Blue phosphor; BaMgAl ₁₀ O ₁₇ : Eu ²⁺
Each phosphor material having an average particle diameter of 2.0 μm can be used. This is put in the server at a rate of 50% by mass, and 1.0% by mass of ethyl cellulose and 49% by mass of solvent (α-terpineol) are added and mixed with stirring in a sand mill to obtain 15 × 10 ⁻³ Pa · s fluorescence. A body ink is prepared. And this is sprayed and applied between the partition walls 20 from a nozzle having a diameter of 60 μm by a pump. At this time, the panel is moved in the longitudinal direction of the partition wall 20, and the phosphor ink is applied in a stripe shape. Thereafter, the phosphor layers 21 to 23 are formed by baking at 500 ° C. for 10 minutes.

Thus, the back panel 16 is completed.
Although the front panel glass 11 and the back panel glass 17 are made of soda lime glass, this is given as an example of the material, and other materials may be used.
(MgO patterning process etc. and PDP completion)
Subsequently, the removal of the crossover region 26 from the display electrodes 12 and 13 and the address electrode 18 in the upper layer MgO 15a is performed as follows.

First, the front panel 10 and the back panel 16 are bonded together with sealing glass to perform a sealing process (FIG. 5 (a)).
After sealing, the panel is vacuum-heated and exhausted using an exhaust pipe provided in a part of the panel. When the inside of the PDP reaches a sufficiently exhausted state, a discharge gas (an etching gas containing Ar) is then introduced when the PDP is driven, and the PDP is sealed off with an exhaust pipe. As the etching gas, a gas having a higher MgO etching rate than a normal discharge gas can be used.

When the aging process is started, the patterning process is executed by the sputtering action of Ar ions 34 and the discharge 33 during the aging process, and the crossover region 26 between the display electrodes 12 and 13 and the address electrode 18 in the upper layer MgO15a is naturally deleted. (Fig. 5 (b)).
At this time, by setting the film thickness of the upper layer MgO to be relatively thin at ˜50 nm, the patterning process of the upper layer MgO 15a can be completed in a short time. Specifically, the patterning process can be performed more easily than a thin film patterning process such as mask depo photolithography.

As a result, the surface of the lower MgO15b, which is easy to discharge, is exposed to the discharge space 24 at the place where the MgO15a corresponding to the crossover region 26 with the display electrodes 12, 13 and the address electrode 18 is completely removed. Sometimes the discharge concentrates in the vicinity of the crossover region 26. Therefore, it is possible to control the discharge near the center of the cell SU.
After that, the inside of the discharge space is evacuated to a high vacuum (1.0 × 10 ^-4 Pa), and then the Ne-Xe system, He-Ne-Xe system, Ne-- Enclose a discharge gas such as Xe-Xe-Ar.

  This completes PDP1.

  The gas discharge display panel of the present invention can be used in the video equipment industry, advertising equipment industry, industrial equipment, and other industrial fields such as large televisions, high-definition televisions, and large display devices.

2 is a cross-sectional perspective view schematically showing a configuration of a PDP in Embodiment 1. FIG. It is a figure which shows the example of a drive process of PDP. FIG. 4 is a virtual electrode layout diagram showing a crossover position between display electrodes and address electrodes, and a partially enlarged view of a PDP. It is a figure which shows the preparation process of a protective layer. It is a figure which shows the preparation process of a protective layer.

Explanation of symbols

1 PDP
10 Front panel
11 Front panel glass
12 Scanning electrode
13 Sustain electrode
14, 19 Dielectric layer
15 Protective layer
15a Upper layer MgO
15b Lower layer MgO
16 Back panel
17 Back panel glass
18 Address electrode
20 Bulkhead
23 Phosphor layer
26 Area where upper layer MgO is removed (crossover area)

Claims (4)

A front panel in which a plurality of pairs of display electrodes are formed on the substrate surface and a back panel in which a plurality of address electrodes are formed on the substrate surface are opposed to each other across the discharge space, and the front panel surface facing the discharge space is disposed on the front panel surface. A plasma display panel on which a protective layer is formed,
The protective layer is formed by sequentially laminating a first layer containing MgO as a main component and a second layer containing MgO having a secondary electron emission coefficient lower than that of the first layer as a main component, and
The second layer is formed in a region excluding a region where the display electrode pair and the address electrode cross over each other in a discharge space when viewed from the vertical direction of the panel. A front panel having a plurality of pairs of display electrodes formed on the substrate surface and a back panel having a plurality of address electrodes formed on the substrate surface are disposed opposite to each other with a discharge space therebetween, and the front panel surface facing the discharge space is protected. A method of manufacturing a plasma display panel in which a layer is formed,
In the protective layer forming step of the front panel,
A laminating step of sequentially laminating a first layer material containing MgO as a main component and a second layer material containing MgO having a secondary electron emission coefficient lower than that of the first layer as a main component on the front panel substrate; ,
When viewed from the vertical direction of the panel, the second layer material is laminated so that the display electrode pair and the address electrode are stacked in a region excluding a region where the display electrode pair and the address electrode cross over a discharge space. A method for manufacturing a plasma display panel, wherein a protective layer is formed by performing a second layer patterning step of patterning the substrate. The second layer patterning step includes an aging step,
In the laminating step, after laminating the second layer material uniformly on the first layer,
3. The method for manufacturing a plasma display panel according to claim 2, wherein in the second layer patterning step, a portion of the second layer material in the crossover region is deleted by the aging step. The aging process is performed using an etching gas having a higher etching rate of MgO than the discharge gas introduced into the plasma display panel,
4. The method for manufacturing a plasma display panel according to claim 3, wherein the etching gas is replaced with the discharge gas after the aging process is completed.

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