JP2009218022A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a PDP suppressing variations in discharge and misdischarge when the panel is lighted, and having little luminance deterioration even if it is used for a long time. <P>SOLUTION: In this plasma display panel, a pair of substrates are arranged face to face so that a discharge space 122 is formed between the substrates, barrier ribs to partition the discharge space to a plurality of spaces are arranged on at least one substrate, electrode groups are arranged on the substrates so that discharge is generated in the discharge spaces partitioned by the barrier ribs, and a green phosphor layer made of a mixture of BaMgAl<SB>10</SB>O<SB>17</SB>:Mn and (Y, Gd)Al<SB>3</SB>(BO<SB>3</SB>)<SB>4</SB>:Tb which emits light by discharge is provided. The mixture ratio of (Y, Gd)Al<SB>3</SB>(BO<SB>3</SB>)<SB>4</SB>:Tb is not less than 30 wt.% and not more than 80 wt.% in this display panel. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a plasma display panel.

  Plasma display devices (hereinafter referred to as “PDP devices”) have recently attracted attention as image display devices capable of realizing high definition and large screens.

  A plasma display panel (hereinafter referred to as “PDP”) is a portion for displaying an image of a PDP device, and is composed of a front plate and a back plate. The front plate includes a display electrode formed of a striped transparent electrode and a metal bus electrode formed on a glass substrate, a dielectric layer covering the display electrode, and a protective layer. On the other hand, the back plate is a stripe-shaped address electrode formed on a glass substrate, a base dielectric layer covering the address electrode, a barrier rib formed on the base dielectric layer, and a phosphor formed between the barrier ribs. It consists of layers.

  The front plate and the back plate are sealed with a sealing material formed in the peripheral portion thereof. A discharge gas made of neon, xenon, or the like is sealed in a gap between the front plate and the back plate formed by sealing.

  The PDP having such a configuration displays an image by discharging a discharge gas with a voltage applied to an electrode group including a display electrode, a sustain electrode, and a scan electrode, and the phosphor layer emits light by ultraviolet rays generated by the discharge. Do.

  The PDP performs full color display by additively mixing so-called three primary colors (red, green, and blue). In order to perform this full-color display, the PDP includes a phosphor layer that emits red, green, and blue light. Each color phosphor layer is formed by laminating phosphor materials of each color.

Here, Zn ₂ SiO ₄ : Mn, which is one of typical green phosphor materials, has a negatively charged surface. For this reason, the amount of charge stored on the phosphor is greatly different from red and blue, and there is a problem that when a voltage for display is applied, a discharge error that does not cause a discharge variation or a discharge easily occurs. This phenomenon requires the set drive voltage to be increased in order to increase the voltage until the display quality is deteriorated or all the lights are turned on to maintain high quality.

In order to solve this problem, attempts have been made to improve discharge characteristics by using positively charged BaMgAl ₁₀ O ₁₇ : Mn as a green phosphor material (see, for example, Patent Document 1).
JP 2004-67874 A

However, BaMgAl ₁₀ O ₁₇ : Mn, which is the configuration disclosed in Patent Document 1, has a problem that the luminance is lower than that of Zn ₂ SiO ₄ : Mn when used alone, and the luminance is greatly deteriorated when the panel is turned on for a long time. .

  The present invention has been made in view of such a current situation, and an object of the present invention is to realize a PDP that suppresses a discharge variation and a discharge error when the panel is turned on and has a small luminance drop even when used for a long time.

In order to achieve the above object, a plasma display panel according to the present invention has a pair of substrates facing each other so that a discharge space is formed between the substrates, and a partition for dividing the discharge space into a plurality of partitions is provided on at least one substrate. A plasma display panel in which an electrode group is arranged on a substrate so that discharge is generated in a discharge space partitioned and partitioned by the barrier ribs and a phosphor layer that emits light by discharge is provided, wherein the phosphor layer is BaMgAl _A green phosphor layer composed of a mixture of ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb is provided, and the mixing ratio of (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb is It is 30 wt% or more and 80 wt% or less.

  According to the present invention, it is possible to realize a PDP that suppresses a discharge variation and a discharge error when the panel is turned on and has a small luminance drop even when used for a long time.

  Hereinafter, a plasma display panel according to an embodiment of the present invention will be described with reference to the drawings. However, the embodiment of the present invention is not limited thereto.

  FIG. 1 is a plan view showing a schematic configuration of electrodes in a PDP according to an embodiment of the present invention. The PDP 100 includes a front glass substrate (not shown), a rear glass substrate 102, a sustain electrode 103, a scan electrode 104, an address electrode 107, and an airtight seal layer 121. N sustain electrodes 103 and scan electrodes 104 are arranged in parallel. M address electrodes 107 are arranged in parallel. The sustain electrode 103, the scan electrode 104, and the address electrode 107 have an electrode matrix having a three-electrode structure, and a discharge cell is formed at the intersection of the scan electrode 104 and the address electrode 107.

  FIG. 2 is a partial cross-sectional perspective view of an image display area in a PDP according to an embodiment of the present invention. The PDP 100 includes a front panel 130 and a back panel 140. A sustain electrode 103, a scan electrode 104, a dielectric glass layer 105, and an MgO protective layer 106 are formed on the front glass substrate 101 of the front panel 130. On the rear glass substrate 102 of the rear panel 140, address electrodes 107, a base dielectric glass layer 108, barrier ribs 109, and phosphor layers 110R, 110G, and 110B are formed.

  The front panel 130 and the back panel 140 are bonded together, and a discharge gas is sealed in a discharge space 122 formed between the front panel 130 and the back panel 140, thereby completing the PDP 100.

  FIG. 3 is a block diagram showing a schematic configuration of a PDP apparatus using the PDP 100 according to the embodiment of the present invention. The PDP 100 is connected to the driving device 150 to constitute a PDP device. A display driver circuit 153, a display scan driver circuit 154, and an address driver circuit 155 are connected to the PDP 100. The controller 152 controls the application of these voltages. Address discharge is performed by applying a predetermined voltage to the scan electrodes 104 and the address electrodes 107 corresponding to the discharge cells to be lit. The controller 152 controls this voltage application. Thereafter, a sustain discharge is performed by applying a pulse voltage between sustain electrode 103 and scan electrode 104. Due to the sustain discharge, ultraviolet rays are generated in the discharge cells in which the address discharge has been performed. The discharge cell is turned on when the phosphor layer excited by the ultraviolet light emits light. An image is displayed by a combination of lighting and non-lighting of each color cell.

  Next, a method for manufacturing the PDP 100 according to an embodiment of the present invention will be described with reference to FIGS. First, a method for manufacturing the front panel 130 will be described. On the front glass substrate 101, N sustain electrodes 103 and scan electrodes 104 are formed in stripes. Thereafter, sustain electrode 103 and scan electrode 104 are coated with dielectric glass layer 105. Further, an MgO protective layer 106 is formed on the surface of the dielectric glass layer 105.

The sustain electrode 103 and the scan electrode 104 are formed by applying a silver paste for an electrode containing silver as a main component by screen printing, followed by baking. The dielectric glass layer 105 is formed by applying a paste containing a bismuth oxide glass material by screen printing and then baking. The paste containing the glass material is, for example, 30 wt% bismuth oxide (Bi ₂ O ₃ ), 28 wt% zinc oxide (ZnO), 23 wt% boron oxide (B ₂ O ₃ ), and 2.4 wt%. % Silicon oxide (SiO ₂ ) and 2.6% by weight aluminum oxide. Further, it is formed by mixing 10% by weight of calcium oxide (CaO), 4% by weight of tungsten oxide (WO ₃ ) and an organic binder (10% ethyl cellulose dissolved in α-terpineol). Here, the organic binder is obtained by dissolving a resin in an organic solvent. In addition to ethyl cellulose, an acrylic resin can be used as the resin, and butyl carbitol can be used as the organic solvent. Furthermore, you may mix a dispersing agent (for example, glyceryl trioleate) in such an organic binder.

  The coating thickness of the dielectric glass layer 105 is adjusted so as to have a predetermined thickness (about 40 μm). The MgO protective layer 106 is made of magnesium oxide (MgO), and is formed to have a predetermined thickness (about 0.5 μm) by, for example, a sputtering method or an ion plating method.

  Next, a method for manufacturing the back panel 140 will be described. On the back glass substrate 102, silver paste for electrodes is screen-printed and baked to form M address electrodes 107 in stripes. A paste containing a bismuth oxide glass material is applied on the address electrode 107 by a screen printing method and then baked to form a base dielectric glass layer 108. Similarly, a paste containing a glass material based on bismuth oxide is repeatedly applied at a predetermined pitch by a screen printing method and then baked to form partition walls 109. The discharge space 122 is partitioned by the barrier ribs 109 to form discharge cells. The distance between the barrier ribs 109 is set to about 130 μm to 240 μm in accordance with a full HD television of 42 inches to 50 inches and an HD television.

A red phosphor layer 110R, a green phosphor layer 110G, and a blue phosphor layer 110B are formed in a groove between two adjacent barrier ribs 109. The red phosphor layer 110R is made of, for example, a red phosphor material of (Y, Gd) BO ₃ : Eu. The blue phosphor layer 110B is made of, for example, a blue phosphor material of BaMgAl ₁₀ O ₁₇ : Eu. The green phosphor layer 110G is made of, for example, a green phosphor material of Zn ₂ SiO ₄ : Mn.

  The front panel 130 and the back panel 140 manufactured in this way are overlapped with each other so that the scanning electrodes 104 of the front panel 130 and the address electrodes 107 of the back panel 140 are orthogonal to each other. Sealing glass is applied to the periphery and baked at about 450 ° C. for 10 minutes to 20 minutes. As shown in FIG. 1, the front panel 130 and the back panel 140 are sealed by forming an airtight seal layer 121. Then, after evacuating the discharge space 122 to a high vacuum, a discharge gas (for example, helium-xenon-based or neon-xenon-based inert gas) is sealed at a predetermined pressure to complete the PDP 100.

  Next, a method for manufacturing each color phosphor material will be described. As the phosphor material constituting the phosphor layers 110R, 110G, and 110B in the PDP according to the embodiment of the present invention, a material manufactured by a solid phase reaction method is used.

BaMgAl ₁₀ O ₁₇ : Eu, which is a blue phosphor material, is produced by the following method. Barium carbonate (BaCO ₃ ), magnesium carbonate (MgCO ₃ ), aluminum oxide, and europium oxide (Eu ₂ O ₃ ) are mixed so as to match the phosphor composition. The mixture is fired at 800 ° C. to 1200 ° C. in air, and further fired at 1200 ° C. to 1400 ° C. in a mixed gas atmosphere containing hydrogen and nitrogen.

The red phosphor material (Y, Gd) BO ₃ : Eu is produced by the following method. Yttrium oxide (Y ₂ O ₃ ), gadolinium oxide (Gd ₂ O ₃ ), boric acid (H ₃ BO ₃ ), and europium oxide (EuO ₂ ) are mixed so as to match the phosphor composition. The mixture is fired at 600 ° C. to 800 ° C. in air, and further fired at 1100 ° C. to 1300 ° C. in a mixed gas atmosphere containing oxygen and nitrogen.

Next, the green phosphor material will be described. The green phosphor material constituting the green phosphor layer 110G in the PDP according to the embodiment of the present invention includes a mixture of BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb. Is used.

BaMgAl ₁₀ O ₁₇ : Mn is produced by the following method. That is, barium carbonate (BaCO ₃ ), magnesium carbonate (MgCO ₃ ), aluminum oxide (Al ₂ O ₃ ), and manganese oxide (Mn ₂ O ₃ ) are mixed so as to match the phosphor composition. The mixture is fired at 800 ° C. to 1200 ° C. in air, and further fired at 1200 ° C. to 1400 ° C. in a mixed gas atmosphere containing hydrogen and nitrogen.

Next, a method for producing (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb will be described. As raw materials, yttrium oxide (Y ₂ O ₃ ), gadolinium oxide (Gd ₂ O ₃ ), aluminum oxide (Al ₂ O ₃ ), boric acid (H ₃ BO ₃ ), terbium oxide (Tb ₂ O ₅ ), (Y, Gd) Al ₃ (BO ₃ ) ₄ constituting the composition of the phosphor base material: After mixing so as to match the composition of Tb, firing in air at 1000 ° C. to 1200 ° C. (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb is produced.

A mixed green phosphor in which BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb thus prepared are mixed at a weight ratio of 1: 1 is prepared. The mixed green phosphor material is laminated to form a green phosphor layer 110G.

The PDP 100 is manufactured by using the back panel 140 in which (Y, Gd) BO ₃ : Eu is stacked on the red phosphor layer 110R and BaMgAl ₁₀ O ₁₇ : Eu is stacked on the blue phosphor layer 110B.

  A driving device 150 is connected to the PDP 100 to produce a PDP device. In this PDP device, only the green phosphor layer emits light, and the initial luminance and the luminance maintenance rate after 1000 hours of lighting (hereinafter referred to as luminance maintenance rate) are measured. The luminance maintenance rate is obtained as follows. Discharge sustain pulses having a voltage of 185 V and a frequency of 100 kHz are alternately applied to the sustain electrode 103 and the scan electrode 104 of the PDP device continuously for 1000 hours. In the PDP device after lighting for 1000 hours, only the green phosphor layer is caused to emit light, and the luminance is measured. The luminance maintenance rate represents the luminance after lighting for 1000 hours with respect to the initial luminance.

The initial luminance of the PDP device using the mixed green phosphor is 102.2, where the initial luminance of the PDP device using the Zn ₂ SiO ₄ : Mn green phosphor alone is 100. In addition, the luminance maintenance rate is 81.5 for the PDP apparatus using the Zn ₂ SiO ₄ : Mn green phosphor alone, and 91.5 for the PDP apparatus using the mixed green phosphor. Further, the complete lighting voltage for PDP lighting is that in the PDP device using Zn ₂ SiO ₄ : Mn alone when the voltage in the PDP device using red phosphor (Y, Gd) BO ₃ : Eu is 100. The voltage is 115, and the voltage in the PDP device using the mixed green phosphor is 102.

As described above, by using a mixed green phosphor in which BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb are mixed, driving without adversely affecting luminance and luminance maintenance rate. The voltage can be reduced.

Table 1 shows various characteristics of the PDP apparatus using BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb mixed green phosphors at various mixing ratios. As characteristics of the PDP device, initial luminance, initial chromaticity and luminance maintenance rate, and complete lighting voltage are shown.

No. 1 is the result of Zn ₂ SiO ₄ : Mn. No. 2 to 12 are results of a mixed green phosphor in which BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb are mixed at various weight ratios. No. 13 is the result of (Y, Gd) BO ₃ : Eu.

FIG. 4 is a characteristic diagram showing the relationship between the initial luminance of the PDP device and the mixing ratio of BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb. As shown in FIG. 4, in the range where the mixing ratio of (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb is 30% by weight or more, the initial luminance can be made higher than that in the case of Zn ₂ SiO ₄ : Mn. it can.

FIG. 5 is a characteristic diagram showing the relationship between the initial chromaticity of the PDP apparatus and the mixing ratio of BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb. As shown in FIG. 5, when the mixing ratio of (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb is 40% by weight or less, good chromaticity is obtained as compared with the case of Zn ₂ SiO ₄ : Mn. be able to. However, if the mixing ratio is about 80% by weight, there is no practical problem.

FIG. 6 is a characteristic diagram showing the relationship between the luminance maintenance ratio of the PDP device and the mixing ratio of BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb. As shown in FIG. 6, when the mixing ratio of (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb is 30% by weight or more, a luminance maintenance rate equal to or higher than that of Zn ₂ SiO ₄ : Mn can be obtained. . Moreover, in any mixed composition, there is no change in the discharge stability of the PDP device after lighting for 1000 hours.

FIG. 7 is a characteristic diagram showing the relationship between the complete lighting voltage of the PDP device and the mixing ratio of BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb. As shown in FIG. 7, the complete lighting voltage is lower than that of Zn ₂ SiO ₄ : Mn regardless of the mixing ratio of (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb, and (Y, Gd) BO ₃ : Equivalent to Eu. Thereby, it is possible to suppress variations in discharge.

Therefore, if the mixing ratio of (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb in the mixed green phosphor is 30% by weight or more and 80% by weight or less, the luminance chromaticity has no practical problem. In addition, it is desirable because the luminance maintenance ratio is improved and the discharge characteristics can be improved.

  INDUSTRIAL APPLICABILITY The present invention suppresses discharge variations and discharge mistakes when the panel is turned on, and can realize a PDP device with little deterioration in luminance even with long-term discharge, and is useful for a large screen display device.

The top view which shows schematic structure of the electrode in PDP by one embodiment of this invention 1 is a partial cross-sectional perspective view of an image display area in a PDP according to an embodiment of the present invention. The block diagram which shows schematic structure of the PDP apparatus using PDP by one embodiment of this invention The characteristic view which showed the relationship between the initial luminance of the PDP apparatus using PDP by one embodiment of this invention, and the mixing ratio of 2 types green phosphor. The characteristic view which showed the relationship between the initial chromaticity of the PDP apparatus using PDP by one embodiment of this invention, and the mixing ratio of 2 types green phosphor The characteristic view which showed the relationship between the luminance maintenance factor of the PDP apparatus using PDP by one embodiment of this invention, and the mixing ratio of 2 types green phosphor The characteristic view which showed the relationship between the complete lighting voltage of the PDP device using PDP by one embodiment of this invention, and the mixing ratio of 2 types green phosphor

Explanation of symbols

100 PDP
DESCRIPTION OF SYMBOLS 101 Front glass substrate 102 Back glass substrate 103 Sustain electrode 104 Scan electrode 105 Dielectric glass layer 106 MgO protective layer 107 Address electrode 108 Base dielectric glass layer 109 Partition 110R Phosphor layer (red phosphor layer)
110G phosphor layer (green phosphor layer)
110B phosphor layer (blue phosphor layer)
121 Airtight Seal Layer 122 Discharge Space 130 Front Panel 140 Rear Panel 150 Drive Device 152 Controller 153 Display Driver Circuit 154 Display Scan Driver Circuit 155 Address Driver Circuit

Claims (1)

A pair of substrates are arranged opposite to each other so that a discharge space is formed between the substrates, and a partition for partitioning the discharge space into a plurality of partitions is disposed on at least one substrate, and a discharge is generated in the discharge space partitioned by the partition. A plasma display panel in which an electrode group is arranged on a substrate to generate and a phosphor layer that emits light by discharge is provided,
The phosphor layer includes a green phosphor layer made of a mixture of BaMgAl ₁₀ O ₁₇ : Mn and (Y, Gd) Al ₃ (BO ₃ ) ₄ : Tb, and (Y, Gd) Al ₃ (BO ₃ ) _4. : A plasma display panel in which the mixing ratio of Tb is 30 wt% or more and 80 wt% or less.

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