JP2005004991A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve light emitting efficiency while suppressing driving voltage of a plasma display panel. <P>SOLUTION: The plasma display panel is provided with a first substrate, a second substrate facing the first substrate, a first electrode formed on the side of the first substrate facing the second substrate, a second electrode formed on the side of the second substrate facing the first substrate, a first dielectric layer formed so that the first electrode is covered, a second dielectric layer formed so that the second electrode is covered, a protective film formed so that the first dielectric layer is covered, and a discharging space with sealing gas sealed inside between the protective layer and the second dielectric layer. The protective film comprises ZnO. Thus, the driving voltage of PDP10 is suppressed to be low and high light emitting efficiency is achieved. Therefore, consumed power of PDP is suppressed and high luminance and high precision can be achieved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display panel (hereinafter referred to as “PDP”), and more particularly to a PDP having an electrode covered with a protective film.
[0002]
[Prior art]
PDP has features such as easy screen enlargement, good display quality, and wide viewing angle compared to liquid crystal display, and can be thinned, so it can be made large, such as a wall-mounted display. It has come to be used as a display device.
[0003]
The outline of the operation principle of the PDP is called a display cell, which excites rare gas particles (molecules, atoms) by causing discharge in a discharge space in which a sealed gas composed of a rare gas, for example, is sealed. The phosphor is excited by the generated ultraviolet light, and visible light from the phosphor is used for display light emission.
[0004]
FIG. 1A schematically shows a cross-sectional view of one display cell having a structure of a conventional alternating current (AC) drive type PDP, and FIG. Show. FIG. 2 is a perspective view of an AC drive type color PDP 100 in which a plurality of the display cells shown in FIGS. 1A and 1B are arranged.
[0005]
Referring to FIGS. 1A, 1B, and 2, in the PDP 100, a front plate 101 made of a glass substrate and a back plate 105 are arranged to face each other with a discharge space 110 interposed therebetween. A display electrode 102 is disposed on the front plate 101 on the side facing the back plate 105. The display electrode 102 is covered with a dielectric layer 103 made of, for example, lead oxide glass, and the like. The dielectric layer 103 is covered with a protective film 104 made of MgO. The display electrode 102 is configured by arranging a pair of band-like scanning electrodes and sustaining electrodes in parallel with each other.
[0006]
On the other hand, a plurality of strip-shaped data electrodes 106 orthogonal to the display electrode 102 are provided on the back plate 105 on the side facing the front plate 101, and the plurality of data electrodes 106 are parallel to each other. And each data electrode 106 is covered by a dielectric layer 107.
[0007]
Further, a partition wall 108 for separating the plurality of data electrodes 106 and forming a discharge space 110 is provided on the dielectric layer 107. Further, a phosphor layer 109 is formed from the dielectric layer 107 on the data electrode 106 to the side surface of the partition wall 108. The PDP 100 shown in FIG. 3 has a structure in which, for example, red, green, and blue phosphors 109 are sequentially arranged with the partition wall 108 interposed therebetween in order to enable color display.
[0008]
The discharge space 110 is filled with a filled gas made of an inert gas, and the filled gas is made of, for example, a mixed gas of at least one of He, Ne, and Ar and Xe.
[0009]
In the PDP 100 having such a structure, the dielectric layers 103 and 107 are provided for accumulating charges generated by applying a voltage to the display electrode 102 and the data electrode 106.
[0010]
In addition, FIG. 2 shows a shape in which three display cells are combined as an example, but the number of display cells is arbitrary, and actually a PDP that is a large display device by combining a larger number of display cells. Form.
[0011]
The operating principle of the PDP 100 is as follows. First, the reset discharge of the display electrode 102 (between the scan electrode and the sustain electrode) is performed in the discharge space 110 of all the cells, the wall charge state is made the same, and then the scan electrode of the display electrode 102 is scanned. At the same time, a voltage is selectively applied to the data electrode 106 to cause an address discharge in the discharge space 110.
[0012]
As a result, wall charges are selectively formed on the display electrode 102. Therefore, when a discharge sustain voltage is next applied to the display electrode 102, it is possible to control whether or not a discharge is generated in the discharge space 110. Depending on the number of sustain discharges in the discharge space 110, an image can be obtained. An image can be displayed by controlling display gradation.
[0013]
Thus, the PDP 100 performs image display by controlling the discharge in the discharge space 110.
[0014]
However, in recent years, high-performance PDPs are required to have higher brightness and higher definition. For example, in order to realize higher brightness and higher definition of PDPs, FIG. There has been proposed a method for increasing the partial pressure of Xe added to the sealed gas sealed in the discharge space 110 shown in B). (For example, refer nonpatent literature 1.)
However, if the light emission efficiency is increased in order to achieve such high brightness and high definition, there is a problem that power consumption increases. For example, in the structure of the PDP 100, the protective film 107 is formed on the protective film 107. A method has been proposed in which a secondary electron emission gain is increased by forming a localized level in the band gap of MgO used, and a driving voltage is lowered by lowering a discharge start voltage. (For example, refer to Patent Document 1 and Patent Document 2.)
[Non-Patent Document 1]
G. Overluizen et al, SID int. Symp. Dig. Tech. Papers, pp 848-851, VOL, XXXIII, May 2002
[0015]
[Non-Patent Document 2]
Y. Motoyama et al, Proc. Int. Display Worksshop '00, pp. 799-802, Dec. 2000
[0016]
[Patent Document 1]
JP-A-8-236028
[0017]
[Patent Document 2]
JP 11-339665 A
[0018]
[Problems to be solved by the invention]
In general, increasing the partial pressure of Xe added to the gas sealed in the PDP discharge space increases the luminous efficiency and increases the brightness and definition, but also increases the drive voltage. As a result, problems such as an increase in cost of the drive circuit and an increase in power consumption occur.
[0019]
FIG. 3 shows changes in the drive sustaining voltage of the PDP when the ratio of the partial pressure of Xe to the total pressure of the sealed gas is changed in the PDP 100 shown in FIG. Referring to FIG. 3, it can be seen that the drive sustain voltage increases as the partial pressure of Xe is increased. Conventionally, the ratio of the partial pressure of Xe to the total pressure of the enclosed gas is about 5 to 6% due to the limitation of the breakdown voltage of the driving circuit of the PDP, and the luminous efficiency is improved by increasing the partial pressure of Xe. Therefore, it has been difficult to achieve high brightness and high definition.
[0020]
In addition, a method of increasing the secondary electron emission gain by forming a localized level in the band gap of MgO used for the protective film 107 and lowering the discharge starting voltage to lower the driving voltage was used. Even in this case, the increase in the voltage with respect to the increase in the partial pressure of Xe shown in FIG. 3 has not been effectively suppressed.
[0021]
Accordingly, an object of the present invention is to provide a PDP useful for solving the above problems.
[0022]
A specific problem of the present invention is to provide a PDP that achieves higher luminance and higher definition by increasing luminous efficiency and suppresses driving voltage and has low power consumption.
[0023]
[Means for Solving the Problems]
In the present invention, in order to solve the above-mentioned problems, a first substrate, a second substrate facing the first substrate, and a side of the first substrate facing the second substrate are formed. The first electrode formed, the second electrode formed on the second substrate facing the first substrate, and the first dielectric formed so as to cover the first electrode A layer, a second dielectric layer formed to cover the second electrode, a protective film formed to cover the first dielectric layer, the protective film, and the second dielectric This is solved by a plasma display panel provided with a discharge space filled with a sealing gas formed between body layers, wherein the protective film is made of ZnO.
[0024]
According to the present invention, the first electrode is covered with the first dielectric layer, and the first dielectric layer is covered with a protective film made of ZnO. The drive voltage of the PDP can be lowered by lowering the discharge start voltage in the discharge space. When ZnO ions or excited particles (atoms and molecules) enter ZnO, secondary electrons are easily emitted from the ZnO surface, that is, the secondary electron gain γ is large. The discharge start voltage that determines the driving voltage of the PDP is highly dependent on the secondary electron gain γ. Since this value is large, ZnO can reduce the discharge start voltage, and the luminous efficiency is increased to increase the brightness and increase the brightness. It is possible to keep the driving voltage of the PDP low while realizing finer.
[0025]
In the above case, it is more preferable that the ratio of the partial pressure of Xe to the total pressure of the sealed gas is 10% or more. In this case, the light emission efficiency is increased, so that high brightness and high definition can be achieved, and the effect of suppressing the drive voltage is particularly great as compared with the conventional case.
[0026]
In the above case, it is more preferable that the hexagonal c-axis of the ZnO crystal of the protective film grows perpendicularly to the substrate and is preferentially oriented in the (0001) plane. In this case, the sputtering resistance of the protective film is improved when a discharge occurs in the discharge space.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
[First embodiment]
Next, embodiments of the present invention will be described below with reference to the drawings.
[0028]
FIG. 4A schematically shows a cross-sectional view of one display cell of the structure of an alternating current (AC) drive type PDP according to the first embodiment of the present invention, and FIG. BB sectional drawing is shown. FIG. 5 is a perspective view of an AC drive type color PDP 10 in which a plurality of the display cells shown in FIGS. 4A and 4B are arranged.
[0029]
4A, 4B and 5, in the PDP 10, the front plate 11 and the back plate 15 made of a glass substrate are arranged to face each other with the discharge space 20 in between. A display electrode 12 is disposed on the front plate 11 on the side facing the back plate 15. The display electrode 12 is covered with a dielectric layer 13 made of, for example, lead oxide glass, and the like. The dielectric layer 13 is covered with a protective film 14 made of ZnO. The display electrode 12 is configured by arranging a pair of strip-like scan electrodes and sustain electrodes in parallel with each other.
[0030]
In this embodiment, the display electrode 12 is covered with the protective film 14 made of ZnO, and the protective film 14 has a structure facing the discharge space 20. For this reason, the discharge start voltage in the discharge space 20 can be lowered, and the driving voltage of the PDP can be kept low. Details of the effect of using ZnO for the protective film will be described later.
[0031]
A plurality of strip-shaped data electrodes 16 orthogonal to the display electrodes 12 are provided on the back plate 15 on the side facing the front plate 11, and the plurality of data electrodes 16 are parallel to each other. The data electrodes 16 are arranged and covered with a dielectric layer 17.
[0032]
Further, a partition wall 18 separating the plurality of data electrodes 16 and forming the discharge space 20 is provided on the dielectric layer 17 substantially in parallel with the data electrodes 16. A phosphor layer 19 is formed from the dielectric layer 17 on the data electrode 16 to the side surface of the partition wall 18. The PDP 10 shown in FIG. 5 has a structure in which, for example, red, green, and blue phosphors 19 are sequentially arranged with the partition wall 18 interposed therebetween in order to enable color display.
[0033]
The discharge space 11 is filled with a filling gas made of an inert gas, and the filling gas is made of, for example, a mixed gas of at least one of He, Ne, and Ar and Xe. In addition, the luminous efficiency of the PDP greatly depends on the enclosed gas. For example, increasing the Xe mixing ratio of the enclosed gas or the ratio of the partial pressure of Xe to the total pressure of the enclosed gas improves the luminous efficiency. It is possible to increase the brightness and definition of the PDP.
[0034]
However, conventionally, when the partial pressure of Xe in the sealed gas is increased, the driving voltage of the PDP tends to increase, and it is difficult to increase the partial pressure of Xe. However, in this embodiment, since the layer made of ZnO is used for the protective film 14, the drive voltage of the PDP is lowered, and the drive voltage increase amount when the partial pressure of Xe in the sealed gas is further increased. In order to achieve the effect of suppressing the emission, it is possible to increase the partial pressure of Xe to improve the light emission efficiency.
[0035]
In the PDP 10, the dielectric layers 13 and 17 are provided for accumulating charges generated by applying a voltage to the display electrode 12 and the data electrode 16.
[0036]
FIG. 5 shows a shape in which three display cells are combined as an example. However, the number of display cells is arbitrary, and actually a PDP that is a large display device by combining a larger number of display cells. Form.
[0037]
The operation principle of the PDP 10 is as follows. First, the reset discharge of the display electrode 12 (between the scan electrode and the sustain electrode) is performed in the discharge space 20 of all the cells, the wall charge state is made the same, and then the scan electrode of the display electrode 12 is scanned. At the same time, a voltage is selectively applied to the data electrode 16 to cause an address discharge in the discharge space 20.
[0038]
As a result, wall charges are selectively formed on the display electrode 12. Therefore, when a discharge sustain voltage is next applied to the display electrode 12, it is possible to control whether or not a discharge is generated in the discharge space 20, and depending on the number of sustain discharges in the discharge space 20, an image can be obtained. An image can be displayed by controlling display gradation.
[0039]
As described above, in the PDP 10, image display is performed by controlling the discharge in the discharge space 20, and reducing the discharge start voltage in the discharge space 20 reduces the drive voltage of the PDP 10. become.
[0040]
In this embodiment, the display electrode 12 has a structure covered with the protective film 14 made of ZnO, and the protective film 14 has a structure facing the discharge space 20. The discharge characteristics in the discharge space 20, the discharge start voltage, and the like largely depend on secondary electrons emitted from the surface of the protective film 14.
[0041]
For example, the discharge start voltage is a secondary electron gain γ that is the ease with which secondary electrons emitted from the surface of the protective film 14 are emitted when ions or excited particles of the sealed gas enter the protective film 14. The discharge start voltage decreases as the secondary electron gain γ increases. The secondary electron gain γ is a value determined mainly by the band structure of the material constituting the protective film 14 and the potential energy of the incident particles.
[0042]
For example, MgO having a relatively large secondary electron gain γ has been widely used as a material for the protective film 14. For example, regarding the value of secondary electron gain γ with respect to Ne ions of MgO, ZrO₂, Al₂O₃, SiO₂It is known that it shows a high value compared to such materials. (Y. Motoyama et al, Proc. Int. Display Worksshop '00, pp. 799-802, Dec. 2000)
However, in the case of a current PDP that utilizes ultraviolet rays emitted from excited Xe, such as the PDP 10, the largest number of particles incident on the protective film 14 are Xe ions. Therefore, when Xe ions are incident on the protective film 14, the discharge voltage is most efficiently lowered when the amount of secondary electrons emitted is large.
[0043]
For example, even in the case of MgO having a relatively large secondary electron gain γ, when Xe ions are incident on MgO, secondary electrons are not emitted, and the secondary electron gain is close to zero. This is due to the following reason.
[0044]
First, the conditions for the secondary electrons to be emitted from the protective film by ions are as follows: Ei is the ionization energy of ions incident on the protective film, Eg is the band gap of the protective film material, and x is the electron affinity. It can be approximated by Ei> 2 (Eg + x) which is condition 1. The ionization energy Ei of Xe is 12.13 eV. However, when MgO is used for the protective film, 2 (Eg + x) = 15.3 eV, so that the condition 1 is not satisfied and secondary electrons are not emitted. . Therefore, for example, a method has been proposed in which the MgO material has a localized level and emits secondary electrons from the localized level. However, since MgO is a material that does not satisfy the condition 1, it is difficult. is there.
[0045]
Therefore, it is necessary to use a material for the protective film that satisfies the above condition 1. For example, when BaO is used, 2 (Eg + x) = 10.2 eV, and BaO is a material that satisfies the above condition 1.
[0046]
However, considering the process of forming BaO, BaCO₃Since it is necessary to form BaO by thermally decomposing at a temperature of 800 ° C. or higher, it is difficult to use it in a PDP manufacturing process that needs to be set to 600 ° C. or lower.
[0047]
Therefore, the inventor of the present invention, as the material that satisfies x in the condition 1, x = 2.08 eV, Eg = 3.3 eV, satisfies the condition 1, and emits secondary electrons upon incidence of Xe ions, ZnO was found.
[0048]
That is, in the PDP 10 shown in FIG. 5, by using ZnO for the protective film 14, the secondary electron gain γ with respect to Xe ions is large, the discharge voltage in the discharge space 20 is lowered, and the driving voltage of the PDP 10 is reduced. It is possible to reduce the power consumption of the PDP while keeping the above low.
[0049]
Thus, the effect of lowering the discharge start voltage in the space 20 is particularly great when the Xe partial pressure of the sealed gas is increased, for example, when the Xe partial pressure of the sealed gas is set to 10% or more. Becomes prominent.
[0050]
Since the PDP 10 displays an image using ultraviolet rays emitted from Xe excited by discharge, increasing the Xe partial pressure of the sealed gas increases the luminous efficiency, increasing the brightness, Refinement becomes possible. Conventionally, when the partial pressure of Xe is increased, the discharge voltage increases rapidly, so it is difficult to increase the Xe partial pressure.
[0051]
In this embodiment, the use of ZnO for the protective film 14 reduces the discharge start voltage of the discharge space 20, and further suppresses the increase in the discharge start voltage when the Xe partial pressure is increased. It is possible to use a sealed gas having a ratio of the partial pressure of Xe to the total pressure of the sealed gas, which has been difficult to use in the past, of 10% or more. High definition is possible.
[0052]
Further, the protective film 14 is sputtered due to collision of ions formed when a discharge occurs in the discharge space 20, and the surface of the protective film 14 is scraped by sputter etching.
[0053]
Therefore, in order to prolong the life or maintenance cycle of the PDP due to damage due to sputtering of the protective film 14, the sputtering resistance of the protective film 14 is increased, that is, the speed at which the protective film 14 is sputter etched. It is important to reduce the size.
[0054]
As a result of experiments, the inventors of the present invention have shown that when forming a ZnO film constituting the protective film 14, the hexagonal c-axis of the ZnO crystal grows perpendicularly to the plane on which the ZnO film is formed. It was found that when the ZnO film was formed so as to be preferentially oriented in the (0001) plane with the above-described orientation, the sputtering resistance of the ZnO film was high.
[0055]
Therefore, the hexagonal c-axis of the ZnO crystal of the ZnO film as the protective film 14 is oriented so that it grows perpendicular to the surface on which the ZnO film is formed, and the ZnO film is preferentially oriented on the (0001) plane. By forming in this way, the speed at which the protective film 14 of the PDP 10 is sputter-etched is reduced, and the life or maintenance cycle of the PDP 10 can be extended.
[0056]
Next, a method for manufacturing the PDP 10 shown in FIGS. 4A and 4B and FIG. 5 will be described. However, in the following text, the same reference numerals are used for the parts described above, and detailed description is omitted.
[0057]
First, on the front plate 11 made of the front plate 11 glass substrate, for example, ITO or SnO₂A transparent conductive film made of, for example, and a laminated film made of chromium (Cr) / copper (Cu) / Cr (chromium) are formed by sputtering.
[0058]
Next, the transparent conductive film and the laminated film are formed into a strip-like pattern with a thickness of 170 μm and the laminated film of 55 μm, respectively, using a photolithography technique, and the display electrode 12 is obtained.
[0059]
Next, a low melting point glass paste is printed on the front plate 11 on which the display electrodes 12 are formed, dried, and then baked to form the dielectric layer 3 having a thickness of about 20 μm. .
[0060]
Next, the protective film 14 made of ZnO is formed to have a thickness of 0.8 μm by using an RF magnetron sputtering method so as to cover the dielectric layer 3. In addition to the RF magnetron sputtering method, a method such as MBE (Molecular Beam Epitaxy), CVD (Chemical Vapor Deposition), PDL (Pulsed Laser Deposition), or the like is used as a method for forming the protective film 14. Can be used.
[0061]
Further, as described above, in order to increase the sputtering resistance of the protective film 14, sputtering deposition is performed in order to preferentially grow the c-axis orientation in which the hexagonal c-axis of the ZnO crystal grows perpendicular to the substrate. For example, the sputtering pressure is 1 to 10 Pa, the oxygen concentration in the mixed gas of Ar and oxygen is 10 to 50%, the substrate temperature is 150 to 500 ° C., and the deposition rate is 1.0 μm / hr.
[0062]
Next, a photosensitive silver paste is formed in a strip pattern using a photolithography technique at a desired position on the back plate 15 made of a glass substrate, thereby forming the data electrode 16 made of silver. The dielectric layer 17 was formed so as to cover the data electrode 16.
[0063]
Further, the barrier rib 8 having a width of 60 μm and a height of 130 μm was formed on the dielectric layer 17, and the phosphor 19 was applied on the surfaces of the barrier rib 18 and the dielectric layer 17. The phosphor 9 is, for example, a red light emitter ((Y_xGd_1-x) BO₃: Eu³⁺), Green light emitter (BaAl₁₂O₁₉: Mn) and blue light emitter (BaMgAl)₁₄O₂₃: Eu²⁺).
[0064]
Next, the front plate 11 and the back plate 15 are bonded together so that the display electrode 12 and the data electrode 16 are orthogonal to each other, the periphery is sealed with glass frit, and the discharge space 20 is exhausted. A sealed gas in which Xe is mixed with Ne is sealed in the discharge space 20 so that the pressure in the discharge space is 5 kPa to 70 kPa. In this case, the partial pressure of Xe may be 10% or more with respect to the total pressure of the sealed gas, and only Xe may be used as the sealed gas without mixing Ne.
[0065]
Next, FIG. 6 shows the result of measuring the drive sustaining voltage of the PDP when the partial pressure of Xe of the sealed gas is increased in the PDP 10. For comparison, the result of the drive sustain voltage when a conventionally used film made of MgO is formed on the protective film 14 by 0.8 μm is also shown. In this case, the total pressure of the sealed gas was 67 kPa. The driving sustain voltage of the PDP strongly depends on the discharge start voltage in the discharge space, and the rate of increase / decrease in the drive sustain voltage of the PDP indicates the rate of increase / decrease in the discharge start voltage.
[0066]
Referring to FIG. 6, in the case where a film made of MgO is used as the protective film 14, the driving sustain voltage is higher than that in the case where a film made of ZnO is used as the protective film 14, and particularly in the sealed gas. When the partial pressure of Xe is increased, the driving sustain voltage tends to increase remarkably.
[0067]
On the other hand, in the PDP 10 using a film made of ZnO for the protective film 14 in this example, it can be seen that the drive sustaining voltage is lower than when a film made of MgO is used for the protective film 14. In particular, in the region where the ratio of the partial pressure of Xe to the total pressure of the sealed gas is 10% or more, the effect of suppressing the drive sustain voltage is great.
[0068]
As described above, since the secondary electron gain γ with respect to the Xe ions of ZnO is larger than that of MgO, the effect of suppressing the discharge start voltage when using ZnO is increased as the Xe partial pressure is increased. Therefore, it is considered that the effect of suppressing the driving sustain voltage of the PDP is increased.
[0069]
In order to obtain such an effect, the total pressure of the sealed gas is preferably in the range of 5 kPa to 70 kPa.
[0070]
In the current PDP, the withstand voltage condition of the drive circuit is about 250 V, and in this embodiment, the ratio of the partial pressure of Xe to the total pressure of the sealed gas, which has been difficult to use in the past, is 10% or more. It became possible to use a sealed gas. Further, even when the sealed gas is not a mixed gas of Ne and Xe but a gas composed of Xe, the driving sustain voltage can be reduced to 250 V or less.
[0071]
Therefore, it is possible to increase the light emission efficiency of the PDP, and it is possible to increase the brightness and the definition while keeping the driving voltage of the PDP low.
[0072]
In this embodiment, the case where ZnO is used for the protective film 14 has been described. However, the effect of the present invention is not limited to this, and for example, a trace amount of metals such as Cu, Mn, and Li is included. Even when a ZnO-based compound is used for the protective film 14, the same effects as described in the present embodiment can be obtained.
[0073]
For example, when forming ZnO by the RF magnetron sputtering method, Cu is simultaneously sputtered to mix Cu into the ZnO film, and the atomic weight ratio of Cu is 0.5 at. %, The resistivity (Ω · cm) is 1 × 10.^{- 9}~ 1x10^{- 8}Since it has a high degree of insulation and is suitable, it is suitable for use as a protective film for an AC drive type PDP.
[0074]
Further, in this embodiment, a film made of ZnO is used as a protective film of the AC drive type PDP, but this is not limited to the AC drive type, and the DC drive type or the AC / DC hybrid drive type is also used. By using it as a protective film covering the cathode or anode, a PDP having a low driving voltage and high efficiency can be formed.
[0075]
【The invention's effect】
According to the present invention, it is possible to reduce the driving voltage of the PDP and achieve high luminous efficiency, and to achieve high brightness and high definition while suppressing the power consumption of the PDP. .
[Brief description of the drawings]
FIG. 1A schematically shows a cross-sectional view of one display cell having a conventional PDP structure, and FIG. 1B is a cross-sectional view taken along the line AA in FIG.
FIG. 2 is a cross-sectional perspective view of a conventional AC drive type color PDP in which a plurality of display cells of FIG. 1 are arranged.
FIG. 3 is a diagram showing Xe voltage division dependence of a drive sustain voltage in a conventional PDP.
FIG. 4A schematically shows a cross-sectional view of one display cell having a PDP structure according to the present invention, and FIG. 4B is a cross-sectional view taken along the line BB in FIG.
5 is a cross-sectional perspective view of an AC drive type color PDP of the present invention in which a plurality of the display cells of FIG. 4 are arranged.
FIG. 6 is a measurement result of the drive sustaining voltage of the PDP according to the embodiment of the present invention depending on the Xe partial pressure.
[Explanation of symbols]
10,100 PDP
11,111 Front plate
12,102 Display electrode
13,103 Dielectric layer
14,104 Protective film
16,106 Data electrode
17,107 Dielectric layer
18,108 Bulkhead
19,109 phosphor
20,110 discharge space

Claims (6)

A first substrate;
A second substrate facing the first substrate;
A first electrode formed on a side of the first substrate facing the second substrate;
A second electrode formed on a side of the second substrate facing the first substrate;
A first dielectric layer formed to cover the first electrode;
A second dielectric layer formed to cover the second electrode;
A protective film formed to cover the first dielectric layer;
A plasma display panel provided between the protective film and the second dielectric layer, and provided with a discharge space filled with a sealed gas;
The plasma display panel, wherein the protective film is made of ZnO. The first substrate and the second substrate are overlapped so that the first electrode formed in a substantially band shape and the second electrode formed in a substantially band shape intersect with each other. The plasma display panel according to claim 1. 3. The plasma display panel according to claim 1, further comprising barrier ribs that divide the discharge space. The plasma display panel according to any one of claims 1 to 3, wherein a phosphor layer is formed on a side of the second dielectric layer facing the first substrate. The plasma display panel according to any one of claims 1 to 4, wherein the sealed gas contains Xe, and a ratio of a partial pressure of Xe to a total pressure of the sealed gas is 10% or more. 6. The hexagonal c-axis of the ZnO crystal of the protective film grows perpendicularly to the substrate and is preferentially oriented in the (0001) plane. 6. Plasma display panel.

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