JP2009252623A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device capable of suppressing separation of a phosphor layer, and thereby displaying a high-quality image. <P>SOLUTION: This plasma display panel is structured such that a pair of substrates 130 and 140 in which at least each front side is transparent are arranged oppositely to each other to form a discharge space 122 between the substrates; barrier ribs 109 for partitioning the discharge space 122 into a plurality of spaces are arranged on at least one-side substrate; electrode groups 103, 104 and 107 are arranged on the substrates to generate discharge in the discharge spaces 122 partitioned by the barrier ribs 109; and phosphor layers 110R, G and B emitting light by discharge are formed. The phosphor layer 110B emitting light in blue out of the phosphor layers contains at least blue phosphor particles BaMgAl<SB>10</SB>O<SB>17</SB>:Eu<SP>2+</SP>, and a ratio occupied by the blue phosphor particles is not smaller than 50% in the phosphor layer. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a plasma display panel used for image display of a television or the like.

  A plasma display device using a plasma display panel (hereinafter referred to as PDP) can achieve high definition and a large screen. Large-scale public display devices are also being commercialized.

  The PDP is composed of a front plate and a back plate. The front plate is a glass substrate made of sodium borosilicate glass by a float method, a display electrode composed of a striped transparent electrode and a metal bus electrode formed on one main surface, and the display electrode A dielectric layer that covers and acts as a capacitor, and a protective layer made of magnesium oxide (MgO) formed on the dielectric layer. On the other hand, the back plate is a glass substrate provided with pores for exhaust and discharge gas encapsulation (also referred to as introduction), and stripe-shaped address electrodes (also referred to as data electrodes) formed on one main surface thereof, It is composed of a base dielectric layer that covers the address electrodes, a partition formed on the base dielectric layer, and a phosphor layer that emits red, green, and blue light formed between the partitions.

  The front plate and the back plate are opposed to each other on the electrode forming surface side, and the periphery thereof is sealed with a sealing material, and a mixed gas of Ne—Xe is used as a discharge gas in a discharge space of 400 Torr to 600 Torr in a discharge space partitioned by a partition wall. It is sealed with pressure.

  The PDP discharges a discharge gas by selectively applying a video signal voltage to a display electrode, and ultraviolet rays generated by the discharge excite each color phosphor layer to emit red, green, and blue light, thereby producing a color image. Display is realized.

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 phosphor layers that emit three primary colors of red, green, and blue. Each color phosphor layer is formed by laminating phosphor particles of each color, (YGd) BO ₃ : Eu ³⁺ or Y ₂ O ₃ : Eu ³⁺ as red phosphor particles, and Zn as green phosphor particles. ₂ SiO ₄ : Mn ²⁺ and BaMgAl ₁₀ O ₁₇ : Eu ²⁺ are known as blue phosphor particles.

  Each of these phosphor particles is held between the partition walls by van der Waals force between particles or between the particles and the partition walls, but the holding force is weak, and it is affected by impact and vibration during the manufacturing process and product transfer. There is a problem that a part of the phosphor layer falls off between the partition walls.

Similarly, in the field of fluorescent lamps where the removal of the phosphor layer is a problem, as a method of increasing the binding power of the phosphor layer, a method of mixing a phosphor layer with a low-melting glass material or a metal oxide as a binder is used. (See Patent Documents 1 and 2).
JP-A-8-190896 JP 2000-351964 A

  In recent years, high-definition full-spec high-definition televisions have 1920 (horizontal) x 1080 (vertical) pixels, about six times the number of conventional NTSC pixels, 852 (horizontal) x 480 (vertical). To do. Therefore, when compared with PDPs of the same size, the area per pixel is 1/6, and the amount of phosphor particles occupying one pixel is reduced. There is a problem that the probability that one pixel becomes a dark spot increases.

  When such a problem is solved by a method using a glass material or a metal oxide as a binder as practiced in the field of the fluorescent lamp described above, there are the following problems. In the fluorescent lamp, the wavelength of the ultraviolet light that excites the phosphor is mainly 200 nm or more and is hardly absorbed by the glass material or the metal oxide, and the luminous efficiency is hardly lowered by using the binder. However, in the PDP, since the wavelength of the ultraviolet light that excites the phosphor is less than 200 nm, the ultraviolet light is absorbed by the glass material or the metal oxide, so that there is a problem that the light emission efficiency is greatly reduced.

  The present invention has been made in view of such a current situation, and an object of the present invention is to provide a PDP that suppresses peeling of a phosphor layer and can display a high-quality image.

In order to achieve the above object, the PDP of the present invention has at least one partition wall for partitioning the discharge space into a plurality of substrates, and at least one pair of substrates transparent at least on the front side is disposed so as to form a discharge space between the substrates. A plasma display panel having an electrode group arranged on the substrate so that discharge is generated in a discharge space partitioned by the partition wall and having a phosphor layer that emits light by discharge. The plasma display in which the phosphor layer emitting blue light among the layers contains at least blue phosphor particles BaMgAl ₁₀ O ₁₇ : Eu ²⁺ and the proportion of the blue phosphor particles in the phosphor layer is 50% or more It is a panel.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to suppress peeling of a fluorescent substance layer, and can provide PDP which enables the display of a high quality image.

  Hereinafter, a PDP according to an embodiment of the present invention will be described with reference to the drawings. However, embodiments of the present invention are 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.

In a groove between two adjacent barrier ribs 109, a red phosphor layer 110R, a green phosphor layer 110G, and a blue phosphor layer 110B are formed by, for example, a screen printing method. The red phosphor layer 110R includes, for example, (Y, Gd) BO ₃ : Eu red phosphor particles. The green phosphor layer 110G includes, for example, Zn ₂ SiO ₄ : Mn green phosphor particles. The blue phosphor layer 110B includes, for example, blue phosphor particles of BaMgAl ₁₀ O ₁₇ : Eu. At this time, the proportion of the blue phosphor particles in the blue phosphor layer 110B is 50% or more.

  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, the phosphor layer that is a characteristic part of the PDP according to the embodiment of the present invention described above will be described in detail.

PDP 100 in the present embodiment is different from the conventional material configuration in fluorescent layer 110.
More specifically, the blue phosphor layer 110B that emits blue light includes at least the blue phosphor particles BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , and the proportion of the phosphor layer particles in the phosphor layer is 50 % Or more.

  That is, in the conventional PDP, the proportion of the blue phosphor particles in the blue phosphor layer is less than 50%, whereas the blue phosphor layer 110B in the PDP according to the embodiment of the present invention is The proportion of phosphor particles in the blue phosphor layer 110B is increased to 50% or more, and this increases the chance of contact between the phosphor particles, thereby increasing the van der Waals force between the particles. Therefore, it is possible to realize a plasma display panel in which the adhesion between the particles is enhanced and the blue phosphor layer 110B is prevented from falling off.

  Here, the proportion of the blue phosphor particles in the blue phosphor layer 110B will be described. First, the measurement method will be described in detail below. The rear panel 140 is cut out from the manufactured PDP 100, and the cut-out rear panel 140 is resin-filled and polished to observe a cross-sectional shape using a scanning electron microscope (Scanning Electron Microscope). FIG. 4 schematically shows a cross section of the back panel 140 in the PDP according to the embodiment of the present invention in a direction perpendicular to the address electrodes 107 disposed on the back panel 140. The proportion of phosphor particles 201 in the phosphor layer 110 is S1 in the cross-sectional observation image, S2 is the area occupied by the phosphor particles 201 in the phosphor layer, and is the area occupied in the space 202. In the case of S3, it is S2 / S1. Further, in the cross-sectional observation image, the phosphor layer 110 is composed of the phosphor particles 201 and the space 202, and thus has a relationship of S1 = S2 + S3.

  Next, a method for evaluating the binding force of the phosphor layer 110 formed between the barrier ribs 109 will be described. Specifically, the fabricated PDP is disassembled, the back substrate is taken out, cleaved into 15 mm × 15 mm chips, the cleaved chips are fixed, and an ejection hole is located 15 mm vertically above the partition top. From the stainless steel tube (inner diameter 0.5 mm), air was blown toward the phosphor layer, the air pressure was gradually increased, and the air pressure at the time when the phosphor layer was peeled off was combined with the phosphor layer. It was defined as strength.

  Each binding force is expressed as a relative value when the binding force of the comparative product 1 as a conventional product is set to 100. If the binding force is 150 or more, it is determined that the binding force is particularly effective.

  In Table 1, the ratio of the blue phosphor particles in the blue phosphor layer of the products of one embodiment of the present invention (Example products 1 to 5) and Comparative products 1 to 5: S2 / S1, average particle diameter, And the result of binding force evaluation is shown.

  As shown in Table 1, in Examples 1 to 5, the ratio of the blue phosphor particles in the blue phosphor layer: S2 / S1 is 50% or more. In such a case, compared with the case where S2 / S1 is smaller than 50% as in Comparative products 1 to 5, the phosphor film is bonded regardless of the average particle diameter of the phosphor particles constituting the phosphor layer. It can be seen that the wearing power can be improved.

  As described above, the present invention is useful for providing a large-screen, high-definition PDP.

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 figure which shows typically the cross section in the direction perpendicular | vertical to the address electrode of the back panel in PDP by one embodiment of this invention.

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 driving device 152 controller 153 display driver circuit 154 display scan driver circuit 155 address driver circuit 201 phosphor particle 202 space

Claims (1)

At least a pair of substrates transparent at least on the front side are disposed 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 is disposed on at least one substrate, and is partitioned by the partition A plasma display panel in which an electrode group is arranged on a substrate so that discharge occurs in a discharge space and a phosphor layer that emits light by discharge is provided, and the phosphor layer that emits blue light among the phosphor layers is blue fluorescent A plasma display panel comprising at least body particles BaMgAl ₁₀ O ₁₇ : Eu ²⁺ , wherein the proportion of the blue phosphor particles in the phosphor layer is 50% or more.

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