JP2009259460A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve a PDP without luminance saturation of a green phosphor, with high brightness and high definition without flickering on a screen, even with one of high Xe pressure. <P>SOLUTION: The PDP is provided with a front-face plate 21 having a display electrode pair 24, a dielectric layer 25 and a protective layer 26 formed on a front-face substrate, and a rear-face plate 31 having data electrodes 32, a base dielectric layer 33, barrier ribs 34, a red phosphor layer 35R, a green phosphor layer 35G and a blue phosphor layer 35B formed on a rear-face substrate, wherein the front-face plate 21 and the rear-face plate 31 faces each other to form a discharge space 36. The protective layer 26 is structured of an MgO material containing a Ca element, and a green phosphor material forming the green phosphor layer 35G is the one selected from BaAl<SB>12</SB>O<SB>19</SB>:Mn<SP>2+</SP>, BaMgAl<SB>10</SB>O<SB>17</SB>:Mn<SP>2+</SP>, or BaMgAL<SB>10</SB>O<SB>17</SB>:Eu<SP>2+</SP>, Mn<SP>2+</SP>. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel used for a display device or the like.

  Since plasma display panels (hereinafter referred to as PDP) can achieve high definition and large screen, 65-inch class televisions have been commercialized. In recent years, PDP has been applied to high-definition televisions having more than twice the number of scanning lines as compared with the conventional NTSC system, and PDP containing no lead component is required in consideration of environmental problems.

  A PDP basically includes a front plate and a back plate. The front plate is a glass substrate of sodium borosilicate glass by a float method, a display electrode composed of a striped transparent electrode and a bus electrode formed on one main surface of the glass substrate, and a display electrode And a protective layer made of magnesium oxide (hereinafter referred to as MgO) formed on the dielectric layer.

  On the other hand, the back plate is a glass substrate, stripe-shaped data electrodes formed on one main surface thereof, a base dielectric layer covering the data electrodes, a partition formed on the base dielectric layer, It is comprised with the fluorescent substance layer which light-emits each of red, green, and blue formed between the partition walls.

The phosphor material is Zn ₂ SiO ₄ : Mn or a green phosphor material made of (Y, Gd) BO ₃ : Tb, a red phosphor made of (Y, Gd) BO ₃ : Eu, Y ₂ O ₃ : Eu. Each color phosphor layer made of a blue phosphor material made of a material, BaMgAl ₁₀ O ₁₇ : Eu, is formed.

The front plate and the back plate are hermetically sealed with their electrode forming surfaces facing each other, and neon (Ne) -xenon (Xe) containing 5% to 20% xenon (Xe) in the discharge space partitioned by the barrier ribs. mixed gas or neon, (Ne) - xenon (Xe) - a mixed gas of helium (He) is filled at a pressure of ^{5 × 10 4 Pa~7 × 10 4} Pa. PDP discharges by selectively applying a video signal voltage to the display electrodes, and the ultraviolet rays generated by the discharge excite each color phosphor layer to emit red, green, and blue light, thereby realizing color image display is doing.

  In a full-spec 42-inch high-definition television set expected in recent years, the number of pixels is 1920 × 1080 and the cell pitch is as small as 0.15 mm × 0.48 mm. In such a high-definition PDP with a cell pitch of 0.25 mm or less, there is a problem that the decrease in luminance and efficiency is particularly apparent. Therefore, in the Ne-Xe discharge gas system, the Xe partial pressure is 20% or more. An example to be improved is disclosed (for example, see Patent Document 1).

  When the Xe partial pressure is increased, there is a problem that the discharge voltage increases and address discharge mistakes frequently occur, causing flickering in the image. In addition, it is known that when the Xe partial pressure is increased, the wavelength of ultraviolet rays generated by discharge changes from a conventional resonance line (wavelength 147 nm) to a molecular beam (173 nm), and the luminous efficiency of (173 nm) at the molecular beam. There is a demand for phosphors having a high value.

In order to reduce the discharge voltage, an example using a composite oxide film of SrO, CaO, BaO and MgO as a protective layer is disclosed. Further, in order to suppress the protective layer from adsorbing H2O, a protective layer forming step Examples of performing the process from the sealing process to the sealing process in a vacuum atmosphere or a dry atmosphere are disclosed (see, for example, Patent Documents 2, 3, and 4).
JP 2007-323922 A JP 05-211031 A JP 2007-317484 A JP 2007-32392 A

  However, if the Xe partial pressure in the discharge gas is increased to increase the brightness, the discharge voltage increases, resulting in a decrease in efficiency, and the amount of Xe ions and excited atoms of Xe also increases. Due to the impact of the particles on the protective layer and the phosphor, there arises a problem that a large amount of water is released from the green phosphor having a large moisture adsorption amount.

  On the other hand, in an example using a composite oxide film of SrO, CaO, BaO and MgO for suppressing an increase in discharge voltage, even if the protective film forming process to the sealing process are performed in a vacuum atmosphere or a dry atmosphere, Water cannot be sufficiently removed, moisture is released during discharge, the drive voltage is increased, address discharge becomes more unstable, and a new problem arises that a high-quality image cannot be obtained.

  The present invention has been made in view of such problems, and an object of the present invention is to provide a high-luminance PDP having a low discharge voltage and stable discharge characteristics even in a PDP having an Xe pressure of 12 kPa or more. .

In order to achieve the above object, a PDP according to the present invention includes a front plate having a display electrode formed on a front substrate, a dielectric layer covering the display electrode, and a protective layer covering the dielectric layer, and a rear substrate. Data electrode formed, base dielectric layer provided to cover data electrode, barrier rib provided on base dielectric layer, side face of partition wall, red phosphor layer formed on base dielectric layer, green phosphor layer, and blue phosphor A PDP in which a back plate having a layer is disposed to face each other so as to form a discharge space, the protective layer is made of an MgO material containing Ca element, and the green phosphor layer forming the green phosphor layer is BaAl ₁₂ One of O ₁₉ : Mn ²⁺ , BaMgAl ₁₀ O ₁₇ : Mn ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ and Mn ²⁺ is used.

  By adopting such a configuration, it is possible to realize a PDP that suppresses an increase in discharge voltage and has high luminance and excellent discharge characteristics.

  Furthermore, Xe gas may be enclosed in the discharge space at an enclosure pressure of 12 kPa or more. According to such a configuration, it is possible to realize a PDP with higher luminance and no increase in discharge voltage.

  Furthermore, it is desirable that a part of the divalent Mn of the green phosphor material is trivalent. According to such a configuration, oxygen defects in the phosphor can be significantly reduced, the amount of moisture adsorbed on the phosphor can be reduced, and absorption of vacuum ultraviolet rays can be suppressed to effectively excite and emit the phosphor. .

Further, it is desirable that a part of the divalent Eu phosphor of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ is trivalent. According to such a configuration, oxygen defects in the phosphor can be significantly reduced, the amount of moisture adsorbed on the phosphor can be reduced, and absorption of vacuum ultraviolet rays can be suppressed to effectively excite and emit the phosphor. .

  The present invention can achieve a high-quality PDP with high brightness and no flickering on the screen, even in a PDP with an increased Xe partial pressure.

Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings.
(Embodiment)
FIG. 1 is an exploded perspective view showing the structure of PDP 10 in the embodiment of the present invention. A plurality of display electrode pairs 24 each including a scanning electrode 22 and a sustain electrode 23 are formed on a glass front plate 21. A dielectric layer 25 is formed so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 26 is formed on the dielectric layer 25.

  In addition, the protective layer 26 has been used as a PDP material to lower the discharge start voltage in the discharge cell, and has a large secondary electron emission coefficient and durability when encapsulating neon (Ne) and xenon (Xe) gas. It is formed from a material mainly composed of MgO having excellent properties.

  The protective layer 26 is made of an MgO material containing CaO containing Ca element. The protective layer 26 is formed on the dielectric layer 25 with a thickness of about 0.6 μm by an electron beam evaporation method using pellets obtained by mixing and firing a CaO material and an MgO material as a target.

  A plurality of data electrodes 32 are formed on the back plate 31, a base dielectric layer 33 is formed so as to cover the data electrodes 32, and a grid-like partition wall 34 is formed thereon. The red phosphor layer 35R, the green phosphor layer 35G, and the blue phosphor layer that emit light of each color of red (R), green (G), and blue (B) are provided on the side surfaces of the partition wall 34 and the base dielectric layer 33. 35B is provided.

  The front plate 21 and the back plate 31 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 cross each other with a minute discharge space 36 interposed therebetween, and the outer peripheral portion thereof is sealed with a sealing material such as glass frit. It is worn. The internal discharge space 36 is filled with a mixed gas of neon (Ne) and xenon (Xe) as a discharge gas. In the present embodiment, a discharge gas having a xenon (Xe) partial pressure of about 12 kPa or more is used in order to improve luminous efficiency. The discharge space 36 is partitioned into a plurality of sections by partition walls 34, and discharge cells are formed at portions where the display electrode pairs 24 and the data electrodes 32 intersect. These discharge cells discharge and emit light to display an image.

  Note that the structure of the PDP 10 is not limited to that described above, and for example, a structure having a stripe-shaped partition may be used. Further, the type of the discharge gas is not limited to the type described above, and may be a discharge gas in which helium (He) is further mixed with neon (Ne) or xenon (Xe).

  The proportion of xenon (Xe) in the discharge space 36 is adjusted so that the xenon (Xe) partial pressure of the discharge gas is 12 kPa to 24 kPa, and the ratio of the xenon (Xe) partial pressure in the total pressure of the discharge gas at this time Is about 28% to 100%.

  FIG. 2 is a diagram showing an arrangement of electrodes of the PDP 10 in the embodiment of the present invention. In the PDP 10, n scan electrodes SC1 to SCn (scan electrode 22 in FIG. 1) and n sustain electrodes SU1 to SUn (sustain electrode 23 in FIG. 1) extending in the row direction are arranged. The m data electrodes D1 to Dm (data electrodes 32 in FIG. 1) extending in the column direction are arranged. A discharge cell is formed at a portion where one pair of scan electrode SCi (i = 1 to n) and sustain electrode SUi intersects one data electrode Dj (j = 1 to m), and the discharge cell is in the discharge space. M × n are formed. A region where m × n discharge cells are formed becomes a display region of the PDP 10.

  FIG. 3 is a circuit block diagram of plasma display device 1 using PDP in accordance with the exemplary embodiment of the present invention. The plasma display apparatus 1 includes a PDP 10, an image signal processing circuit 41, a data electrode drive circuit 42, a scan electrode drive circuit 43, a sustain electrode drive circuit 44, a timing generation circuit 45, and a power supply circuit that supplies necessary power to each circuit block. (Not shown).

  The image signal processing circuit 41 converts the input image signal sig into image data indicating light emission / non-light emission for each subfield according to the number of pixels of the PDP 10. The data electrode drive circuit 42 converts the image data for each subfield into signals corresponding to the data electrodes D1 to Dm, and drives the data electrodes D1 to Dm based on the timing signal.

  The timing generation circuit 45 generates various timing signals for controlling the operation of each circuit block based on outputs from the horizontal synchronization signal H and the vertical synchronization signal V, and each circuit block (image signal processing circuit 41, data electrode drive). Circuit 42, scan electrode drive circuit 43, and sustain electrode drive circuit 44).

  Scan electrode drive circuit 43 includes an initialization waveform generation circuit for generating an initialization waveform to be applied to scan electrode SC1 through scan electrode SCn in the initialization period, and includes a plurality of scan ICs, and scan electrode SC1 through scan electrode in the write period. A scan pulse generating circuit for generating a scan pulse to be applied to SCn, and a sustain pulse generating circuit (not shown) for generating a sustain pulse to be applied to scan electrode SC1 through scan electrode SCn in the sustain period. Then, each scan electrode SC1 to scan electrode SCn is driven based on the timing signal.

  Sustain electrode drive circuit 44 includes a sustain pulse generation circuit and a circuit (not shown) for generating voltage Ve1 and voltage Ve2, and drives sustain electrode SU1 through sustain electrode SUn based on a timing signal.

  The PDP 10 generates an electric discharge by applying an alternating voltage between the display electrode pair 24 in the discharge cell in which writing is performed by these drive circuits. Due to the generation of the sustain discharge, the display light emission is emitted from the excited Xe atoms in the discharge space 36 by a resonance line of 147 nm and from the excited Xe molecules by a molecular beam mainly of 173 nm. The layer 35R, the green phosphor layer 35G, and the red phosphor layer 35R are converted into visible light to display an image.

  Next, details of the phosphor layers 35R, 35G, and 35B will be described.

Each of the phosphor layers 35R, 35G, and 35B has an average particle diameter of 0.1 μm to 5 μm, and a film thickness of each phosphor layer is 1 μm to 12 μm. As phosphor materials of the respective colors, Y (V, P) O ₄ : Eu ³⁺ is used as a red phosphor, and BaAl ₁₂ O ₁₉ : Mn ²⁺ and BaMgAl ₁₀ O ₁₇ : Mn are used as green phosphors. Any one of ²⁺ , BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ (hereinafter referred to as BAM-Mn system) is used. Further, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ is used as the blue phosphor.

  Next, a method for manufacturing these phosphor materials will be described.

First, a method for manufacturing a red phosphor that forms the red phosphor layer 35R will be described. Y (V, P) O ₄ : Eu ³⁺ of the red phosphor is a raw material of the phosphor, yttrium oxide (Y ₂ O ₃ ), vanadium oxide (V ₂ O ₅ ), phosphorus pentoxide (P ₂ O) _5), after the europium oxide (Eu _2O3) as a raw material for the luminescent center are mixed to match the phosphor composition was baked at 600 ° C. to 800 ° C. in air, oxygen _(O 2), nitrogen _{(N 2} ) A red phosphor Y (V, P) O ₄ : Eu ³⁺ is produced by firing at 1100 ° C. to 1300 ° C. in an atmosphere.

Among the various red phosphor materials, Y (V, P) O ₄ : Eu ³⁺ phosphor is partly flux (flux) when P and V in the phosphor composition are baked, resulting in lattice defects. No phosphor crystal can be realized. Therefore, the amount of moisture adsorbed can be reduced, which is preferable as a red phosphor material.

Next, a method for manufacturing a green phosphor that forms the green phosphor layer 35G will be described. Barium carbonate (BaCO ₃ ), magnesium carbonate (MgCO ₃ ), aluminum oxide (Al ₂ O ₃ ), and manganese oxide (Mn ₂ O ₃ ) as a raw material for the emission center, which are raw materials for the BAM-Mn phosphor. Europium oxide (Eu ₂ O ₃ ) or the like is weighed at a molar ratio of the phosphor composition, and aluminum fluoride is added and mixed as a crystal growth accelerator to the weighed raw material. Thereafter, firing is performed at 1000 ° C. to 1400 ° C. in an air atmosphere, and then the fired mixed powder is fired at 1100 ° C. to 1400 ° C. in a nitrogen (N ₂ ) and hydrogen (H ₂ ) atmosphere (weak reducing atmosphere). A green phosphor in which the valences of the Mn element and Eu element are divalent is produced.

  Furthermore, when this green phosphor is baked at 600 ° C. to 900 ° C. in an oxidizing atmosphere to make a part of the bivalent Mn or Eu trivalent, oxygen defects in the phosphor can be greatly reduced, The amount of adsorption can be reduced. Further, although the amount of water adsorbed decreases as the amount of divalent Mn or a part of Eu divalent in a trivalent amount increases, the luminance of the phosphor decreases. % To about 20% is preferable.

  Further, it is preferable that the divalent Mn as the luminescent center is substituted with the divalent Mg or the divalent Ba, and the amount of substitution is 2 mol% to 20 mol%. Further, it is preferable that the Eu divalent is replaced with the Ba divalent, and the substitution amount is 0.0005 mol% to 5 mol%.

Next, a method for manufacturing a blue phosphor that forms the blue phosphor layer 35B will be described. BaMgAl ₁₀ O ₁₇ : Eu ²⁺ phosphor raw material, barium carbonate (BaCO ₃ ), strontium carbonate (SrCO ₃ ), magnesium carbonate (MgCO ₃ ), aluminum oxide (Al ₂ O ₃ ), and luminescent center raw material Europium oxide (Eu ₂ O ₃ ) is weighed at a molar ratio of the phosphor composition, and aluminum fluoride is added and mixed as a crystal growth accelerator. Thereafter, the blue phosphor is fired at 1100 ° C. to 1300 ° C. in an air atmosphere, and then the fired mixed powder is fired at 1100 ° C. to 1400 ° C. in a reducing atmosphere to make the Eu element valence two. Create Furthermore, when this blue phosphor is fired in an oxidizing atmosphere at 600 ° C. to 900 ° C. to make a part of the divalent Eu trivalent, the oxygen defects of the phosphor are greatly reduced and the amount of moisture adsorbed is reduced. can do.

  In addition, although the amount which adsorb | sucks a part of Eu bivalent part to trivalent one will reduce the moisture adsorption amount, since the brightness | luminance of fluorescent substance falls, about 10 to 40% is preferable. Further, it is preferable that the divalent Eu of the luminescent center is substituted with the divalent Ba, and the amount of substitution is 0.5 mol% to 20 mol%.

  Thus, as in the method for producing a green phosphor or a blue phosphor, a phosphor in which Eu is divalent by firing in a reducing atmosphere is fired in an oxidizing atmosphere at 600 ° C. to 900 ° C. to thereby increase the vicinity of the surface. When a part of Eu2 valence is made trivalent, oxygen defects in the phosphor can be greatly reduced, and the amount of moisture adsorbed can be greatly reduced.

In the above description, Y (V, P) O ₄ is used for the red phosphor, BAM-Mn system is used for the green phosphor, and BaMgAl10O17: Eu, which has only two valences Eu, is used for the blue phosphor. However, as long as the discharge characteristics and image quality are not deteriorated, the red phosphor is a conventional red phosphor (Y, Gd) BO ₃ : Eu mixed phosphor, and the green phosphor is a conventional green phosphor. (Y, Gd) BO ₃ : Tb or Zn ₂ SiO ₄ : Mn mixed phosphor may be used.

  As described above, in the PDP according to the embodiment of the present invention, xenon (Xe) or neon (Ne) gas is used as the discharge gas filled in the discharge space 36 of the PDP 10, and the pressure of the xenon (Xe) gas is set. It is set as high as 12 kPa or more. Therefore, high brightness can be realized. For the green phosphor layer, a BAM-Mn phosphor material with a small amount of moisture adsorption is used, and MgO containing Ca element capable of reducing the drive voltage is used for the protective layer. Therefore, even if the Xe pressure is set to be higher than 12 kPa, the release of moisture generated from the phosphor layer due to the impact of Xe ions and excited atoms of Xe is suppressed, and the discharge of secondary electrons and exoelectrons is facilitated. Can be lowered. As a result, high-quality image display with high brightness, high efficiency, and stable discharge can be realized.

Next, the details of the examination experiment described in the above embodiment will be described as examples.
(Example)
In this example, a 42-inch full high-definition television PDP device in which the material composition of each color phosphor and the material composition of the protective layer 26 was changed was produced, and the pressure of xenon (Xe) as a discharge gas was changed, Along with the following experiments, the brightness of the image display, the discharge voltage, and the stability of the discharge were examined. The results are shown in Table 1. In Table 1, the brightness of the PDP, the stability of the discharge, and the discharge voltage were examined using the composition of the phosphor material, the amount of moisture adsorbed on the phosphor powder, the xenon (Xe) pressure, and the material composition of the protective layer 26 as parameters. The results are shown in Table 1.

Table 1 shows the amount of water adsorbed on the phosphor powder. The amount of gas adsorbed on the phosphor powder was measured with a commercially available TDS apparatus. The amount of moisture (H ₂ O) desorbed by placing the phosphor powder in the sample chamber of the TDS apparatus, heating and heating in high vacuum, and performing quadrupole mass spectrometry on the gas desorbed during the temperature increase. Was measured.

  Table 1 also shows the brightness of the PDP when the xenon (Xe) pressure is changed, with an AC voltage of typically 180 V and 200 kHz applied between the scan electrode 22 and the sustain electrode 23 constituting the display electrode pair. The result measured by the luminance meter is shown. In addition, a discharge sustain voltage that can maintain a stable discharge by applying an AC voltage between the scan electrode 22 and the sustain electrode 23 is measured.

  Further, as the material composition of the protective layer 26, the amount of CaO added to MgO is changed. The addition amount changes the material composition of the protective layer 26 by changing the composition ratio of the target when performing electron beam evaporation.

  Further, the result of visual observation of whether or not flickering (address miss) occurs on the screen after the PDP device is turned on for 10 minutes is also shown.

  On the other hand, FIG. 4 shows the ratio of the luminance when the ZSM system is used as the green phosphor and the luminance when the BAM-Mn system is used in the PDP according to the embodiment of the present invention, and the discharge gas xenon (Xe). It is a figure which shows the relationship with a pressure.

  In addition, sample No1-sample No7 in Table 1 are PDP in embodiment of this invention, and sample No8-sample No10 is a comparative example with embodiment of this invention.

  As shown in FIG. 4, when the xenon (Xe) pressure is larger than 12 kPa, the brightness is higher when the BAM-Mn material is used as the green phosphor than when the ZSM material is used. can do. That is, the ZSM-based material as the green phosphor is saturated with luminance as the xenon (Xe) pressure increases, whereas the BAM-Mn green phosphor is saturated with luminance as the xenon (Xe) pressure increases. Does not occur.

  It is presumed that the luminance saturation factor of the phosphor is a gas such as moisture released from the phosphor material. That is, when the xenon (Xe) partial pressure is increased, the discharge start voltage increases, so that the applied pulse voltage also increases, and as a result, the amount of Xe ions and Xe excited particles in the discharge space increases. Due to these increased excited particles, the MgO protective layer and the phosphor layer receive an impact, and a large amount of gas such as moisture is released from the phosphor having a large moisture adsorption amount. Such a gas absorbs part of the vacuum ultraviolet rays, and the phosphor cannot be excited and emitted effectively. As a result, luminance saturation occurs and the expected Xe partial pressure increase effect cannot be obtained. I guess it was.

Further, as shown in Table 1, as shown in Examples 1 to 7, which are embodiments of the present invention, as a green phosphor, a BAM-Mn-based BaAl ₁₂ O ₁₉ : Mn ²⁺ , BaMgAl ₁₀ O _{17 is used.} Xenon (Xe) gas in PDP using MgO with 1% to 30% of CaO added as a protective layer, any one of: Mn 2 ⁺ , BaMgAl ₁₀ O ₁₇ : Eu 2 ⁺ and Mn 2 ⁺ It was found that the discharge voltage was lower than that of the conventional low xenon (Xe) partial pressure (less than 12 kPa), high brightness and no flickering of the image display even when the pressure of 12 kPa or higher.

  At this time, the water adsorption amount of these green phosphors is about 0.17 cc / g or less, which is smaller than that of the sample Nos. 9 and 10 green phosphors. Accordingly, moisture release is suppressed from the green phosphor having a large moisture adsorption amount, and an increase in discharge voltage due to moisture when using a composite oxide film of CaO and MgO can be suppressed.

  Therefore, if a green phosphor that is a BAM-Mn type and has a small amount of water adsorption, which is a feature of the present invention, and MgO with 1 to 30% of CaO added to the protective layer is used, the conventional green phosphor is used. It can be seen that a higher luminance can be maintained than in the case. Furthermore, since these phosphors have little moisture adsorption, the amount of moisture adsorbed on the MgO protective layer to which Ca element is added decreases, and even when the drive is performed over a long period of time, the rise in the discharge voltage is suppressed and flickering occurs. Can maintain stable image display. Therefore, even at a high xenon (Xe) pressure, the amount of moisture adsorbed on MgO is reduced, and even if the high xenon (Xe) pressure, that is, the xenon (Xe) concentration in the discharge gas is increased, an increase in discharge voltage can be suppressed. is there.

  On the other hand, in sample No. 8, the same BAM-Mn system as in Examples 1 to 7 was used for the green phosphor, but the xenon (Xe) pressure was as low as 9 kPa, so the brightness of the PDP used the conventional ZSM system The luminance was as low as the case. From this, it can be seen that in the embodiment of the present invention, the effect is remarkable when the xenon (Xe) pressure in the discharge gas is high.

Sample No. 9 uses a conventional (Y, Gd) BO ₃ : Tb phosphor as a green phosphor, and therefore has a large amount of moisture adsorption to the green phosphor. Therefore, it can be seen that even when the xenon (Xe) pressure is increased to 20 kPa, the increase in luminance is small, the discharge voltage is further increased, and the discharge is unstable.

  In addition, since sample No. 10 uses a conventional ZSM phosphor as the green phosphor, the amount of moisture adsorbed on the green phosphor is large. Therefore, it can be seen that even when the xenon (Xe) pressure that was effective in sample Nos. 1 to 7 was 12 kPa, the luminance was low, the discharge voltage increased, and the discharge was unstable.

Furthermore, in the embodiment of the present invention, when a part of the bivalent Mn of the BAM-Mn material, which is a green phosphor material, is trivalent, the oxygen defects of the phosphor are greatly reduced and fluorescence is reduced. The amount of moisture adsorbed on the body can be reduced and the absorption of vacuum ultraviolet rays can be suppressed to effectively cause the phosphor to excite and emit light. As a result, the luminance can be further improved. Further, among the BAM-Mn-based materials, BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ green phosphor material Eu may be partially trivalent to make it trivalent. Oxygen defects can be greatly reduced to reduce the amount of moisture adsorbed on the phosphor, and absorption of vacuum ultraviolet rays can be suppressed to effectively cause the phosphor to excite and emit light.

As described above, according to the PDP in the embodiment of the present invention, as the green phosphor, BAM-Mn-based BaAl ₁₂ O ₁₉ : Mn ²⁺ , BaMgAl ₁₀ O ₁₇ : Mn ²⁺ , BaMgAl ₁₀ O ₁₇ : When any one of Eu ²⁺ and Mn ²⁺ is added with MgO added with 1% to 30% of CaO as a protective layer, and the pressure of xenon (Xe) gas is set to 12 kPa or more, the discharge voltage is reduced. A low-intensity and high-flicker PDP with image display can be realized.

  The above embodiment is used as an example to explain the configuration of the present invention and the effects obtained therefrom, and the present invention is not limited to this except for the features described above. It is not something to receive. For example, in the above embodiment, the xenon (Xe) -neon (Ne) binary mixed gas has been described as the discharge gas. However, the discharge gas is obtained by adding a third gas to the discharge gas. Is also applicable.

  The present invention can maintain stable display performance while maintaining high luminous efficiency, and can be applied to a large, high-definition television or a large display device.

The disassembled perspective view which shows the structure of PDP in embodiment of this invention The figure which shows the arrangement | sequence of the electrode of the PDP Circuit block diagram of plasma display device using the same PDP The figure which shows the relationship between the ratio of the brightness | luminance at the time of using the ZSM type | system | group as a green fluorescent substance and the brightness | luminance at the time of using a BAM-Mn type | system | group, and the xenon (Xe) pressure of discharge gas in the PDP.

Explanation of symbols

1 Plasma display device 10 Plasma display panel (PDP)
21 Front plate 22 Scan electrode 23 Sustain electrode 24 Display electrode pair 25 Dielectric layer 26 Protective layer 31 Back plate 32 Data electrode 33 Underlying dielectric layer 34 Partition 35R Red phosphor layer 35G Green phosphor layer 35B Blue phosphor layer 36 Discharge Space 41 Image signal processing circuit 42 Data electrode drive circuit 43 Scan electrode drive circuit 44 Sustain electrode drive circuit 45 Timing generation circuit

Claims (4)

A front plate having a display electrode formed on the front substrate, a dielectric layer covering the display electrode, and a protective layer covering the dielectric layer, a data electrode formed on the rear substrate, and the data electrode are provided to cover the data electrode Discharging a base dielectric layer, a partition provided on the base dielectric layer, a side surface of the partition, and a back plate having a red phosphor layer, a green phosphor layer, and a blue phosphor layer formed on the base dielectric layer A plasma display panel arranged opposite to form a space,
The protective layer is made of an MgO material containing Ca element, and the green phosphor material forming the green phosphor layer is BaAl ₁₂ O ₁₉ : Mn ²⁺ , BaMgAl ₁₀ O ₁₇ : Mn ²⁺ , BaMgAl ₁₀ O ₁₇ : A plasma display panel, which is one of Eu ²⁺ and Mn ²⁺ . The plasma display panel according to claim 1, wherein Xe gas is sealed in the discharge space at a sealing pressure of 12 kPa or more. 3. The plasma display panel according to claim 1, wherein a part of the Mn divalent of the green phosphor material is trivalent. 4. The green phosphor material of BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , Mn ²⁺ is characterized in that a part of the divalent Eu is trivalent in part. 5. 2. A plasma display panel according to 1.

Images