JP2011228003A - Plasma display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display panel (PDP) which can prevent the generation of audio noise and the occurrence of crosstalk by keeping constant the gap between a front substrate and a rear substrate.SOLUTION: A PDP 10 comprises: a front substrate 11 formed of a plurality of display electrode pairs 14 with the paired electrodes being parallel to each other, a dielectric layer 15 and a protection layer 16; and a rear substrate 17 formed of a plurality of data electrodes 18 parallel to one another, a base dielectric layer 19, a barrier rib 20 and a phosphor layer. The front substrate 11 and the rear substrate 17 are arranged opposite to each other with the barrier rib 20 interposed so as to define a discharge space, and the substrates are sealed around their periphery with a sealing material. The base dielectric layer 19 is provided in an inner peripheral area 41 of the rear substrate 17, excluding an outer peripheral area 40. The sealing material is composed of a first sealing material 25 disposed in the outer peripheral area 40 and a second sealing material 28 disposed in the inner peripheral area 41. A large-diameter particulate material 29 is provided in the first sealing material 25 and a small-diameter particulate material 30 is provided in the second sealing material 28. The particle diameter of the large-diameter particulate material 29 is greater than that of the small-diameter particulate material 30 by the thickness of the base dielectric layer 19.

Description

  The present invention relates to a plasma display panel.

  A typical AC surface discharge type PDP as a plasma display panel (hereinafter abbreviated as “PDP”) is composed of a front substrate and a rear substrate, which are arranged to face each other and have their surroundings sealed together, The discharge cell is formed.

  The front substrate is formed with a plurality of display electrode pairs parallel to each other on a glass substrate, a dielectric layer is formed to cover the display electrode pairs, and a protective layer is further formed to cover the dielectric layer. Yes. On the other hand, in the rear substrate, a plurality of data electrodes parallel to each other are formed on a glass substrate, and a base dielectric layer is formed so as to cover the data electrodes. Further, a grid-like barrier rib is formed on the base dielectric layer, and a phosphor layer is formed on the surface of the base dielectric layer and the side surface of the barrier rib. The front substrate and the rear substrate are arranged to face each other so that the display electrode pair and the data electrode intersect with each other, and the periphery is sealed, and a discharge space is formed inside. A discharge gas is sealed in the internal discharge space, and a discharge cell is formed in a portion where the display electrode pair and the data electrode face each other. Ultraviolet light is generated by gas discharge in each discharge cell of the PDP having such a configuration, and phosphors of red, green, and blue colors are excited and emitted by the ultraviolet light to perform color display.

  The front substrate and the back substrate are sealed with a sealing material, but the front substrate is deformed due to variations in the film thickness of the sealing material, and the front substrate and the partition wall are partly driven when driving the PDP. There are problems such as generating audible noise by touching the target and generating crosstalk in adjacent cells. For such a problem, there is a method in which beads having a size equal to the distance between the front substrate and the rear substrate are kneaded and applied in the paste of the sealing material, and the distance between the front substrate and the rear substrate is kept constant. It is disclosed in Patent Literature 1, Patent Literature 2, and Patent Literature 3.

JP 2001-236896 A JP 2006-310050 A JP 2009-259705 A

  However, in the method of kneading and applying beads serving as spacers in the paste of the sealing material, the mixing of the sealing material and the beads becomes uneven, and the beads aggregate in the paste of the sealing material. The problem is that the gap cannot be kept constant.

  Further, when a sealing material is applied to the back substrate, an end region of the back substrate to which the sealing material is applied includes a region where the base dielectric layer is formed and a region where the base dielectric layer is not formed. Exists. Therefore, there arises a problem that a gap is different between a place where the beads kneaded in the sealing material paste are arranged on the base dielectric layer and a place where the beads are not formed on the base dielectric layer. .

  Further, when these beads are arranged on the data electrode, problems such as disconnection of the data electrode occur.

  The present invention solves such a problem, suppresses variations in the film thickness of the sealing material, maintains a constant distance between the front substrate and the rear substrate, and suppresses generation of auditory noise and crosstalk. An object of the present invention is to provide an improved PDP and a manufacturing method thereof.

  In order to achieve the above object, the PDP of the present invention includes a front substrate on which a plurality of display electrode pairs, a dielectric layer, and a protective layer parallel to each other are formed, a plurality of data electrodes and a base dielectric that are parallel to each other. A PDP in which a layer, a barrier rib, and a back substrate on which a phosphor layer is formed are arranged opposite to each other with a barrier rib interposed therebetween so as to form a discharge space therebetween, and is surrounded by a sealing material. A layer is provided in an inner peripheral region excluding the outer peripheral region of the back substrate, and a sealing material is constituted by a first sealing material provided in the outer peripheral region and a second sealing material provided in the inner peripheral region, and the first sealing The first bead is arranged in the material, the second bead is arranged in the second sealing material, and the particle size of the first bead is made larger than the particle size of the second bead by the film thickness of the underlying dielectric layer. ing.

  According to such a configuration, the outer peripheral region of the base dielectric layer and the base dielectric layer region are distinguished from each other, and a sealing material is formed on each of them, and beads having a constant gap are disposed, thereby providing a front surface. It is possible to realize a PDP in which the gap between the substrate and the back substrate is constant and the generation of auditory noise and the occurrence of crosstalk are suppressed.

  As described above, according to the PDP of the present invention, the distance between the front substrate and the rear substrate can be maintained at a predetermined size, and a PDP in which generation of audible noise and occurrence of crosstalk is suppressed can be realized. it can.

2 is a partial exploded perspective view of the PDP in Embodiment 1. FIG. It is the fragmentary sectional view seen from the arrow A direction in FIG. 5 is a flowchart showing a method for manufacturing a PDP in a second embodiment. It is a figure shown about the method of application | coating of the 1st sealing material of the sealing material application | coating step in the manufacturing method, and the dispersion | distribution arrangement | positioning of a large diameter granular material. It is a figure which shows the other Example of the sealing material application | coating step of the manufacturing method. It is a figure which shows the baking apparatus used for the sealing step of the manufacturing method, an exhaustion step, and a discharge gas supply step.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is an exploded perspective view showing the structure of the PDP 10 in the embodiment, and FIG. 2 is a partial cross-sectional view thereof. As shown in FIGS. 1 and 2, the PDP 10 includes a front substrate 11 and a back substrate 17.

1 and 2, a plurality of pairs of display electrodes 14 are formed on a glass front substrate 11 in parallel with each other by a scan electrode 12 and a sustain electrode 13. Scan electrode 12 and sustain electrode 13 are formed in a pattern that repeats in the arrangement of scan electrode 12 -sustain electrode 13 -sustain electrode 13 -scan electrode 12. The scanning electrode 12 is formed on a wide transparent electrode 12a made of a conductive metal oxide such as indium tin oxide (ITO), tin oxide (SnO ₂ ), or zinc oxide (ZnO), in order to increase conductivity. A narrow bus electrode 12b containing a metal such as (Ag) is stacked. Similarly, the sustain electrode 13 is formed by laminating a narrow bus electrode 13b on a wide transparent electrode 13a. Further, a dielectric layer 15 and a protective layer 16 are formed so as to cover the display electrode pair 14. The dielectric layer 15 is made of bismuth oxide-based low melting glass or zinc oxide-based low melting glass having a thickness of about 40 μm. The protective layer 16 is a thin film layer made of an alkaline earth oxide mainly composed of magnesium oxide (MgO) having a film thickness of about 0.8 μm. The protective layer 16 protects the dielectric layer 15 from ion sputtering and discharge start voltage, etc. It is provided to stabilize the discharge characteristics.

On the other hand, a plurality of parallel data electrodes 18 made of a conductive material mainly composed of silver are formed on a glass back substrate 17, and a base dielectric layer 19 is formed so as to cover the data electrodes 18. ing. The underlying dielectric layer 19 may be the same material as that of the dielectric layer 15, but may also be a material mixed with titanium oxide (TiO ₂ ) particles so as to function as a visible light reflecting layer. A grid-like partition wall 20 is formed on the base dielectric layer 19, and red (R), green (G), and blue (B) colors are formed on the surface of the base dielectric layer 19 and the side surfaces of the partition wall 20. A phosphor layer 23 is formed. The partition wall 20 is formed to a height of about 0.12 mm using, for example, a low-melting glass material. The phosphor layer 23 is about 15 μm using BaMgAl ₁₀ O ₁₇ : Eu as a blue phosphor, Zn ₂ SiO ₄ : Mn as a green phosphor, (Y, Gd) BO ₃ : Eu as a red phosphor, and the like. The film thickness is formed.

  Further, as shown in FIG. 2, the rear substrate 17 is provided with an exhaust hole 27 and communicates with the exhaust pipe 31, and the exhaust hole 27 and the exhaust pipe 31 allow the exhaust from the discharge space 26 and the discharge gas to be enclosed. Done.

  The front substrate 11 and the rear substrate 17 are arranged to face each other with the partition wall 20 therebetween so that the display electrode pair 14 and the data electrode 18 intersect each other, and the periphery (outside of the image display area) is surrounded by the first sealing material 25 and the first substrate. 2 is sealed by a sealing material 28, and a discharge space 26 is formed inside. A discharge gas containing xenon (Xe) or the like is sealed in the discharge space 26 at a pressure of about 60 kPa. The discharge space 26 is partitioned into a plurality of sections by a grid-like partition wall 20, and a discharge cell 24 is formed at a portion where the display electrode pair 14 and the data electrode 18 intersect. These discharge cells 24 discharge and emit light to display an image. Note that the structure of the PDP 10 is not limited to that described above, and the partition walls 20 may be stripe-shaped.

  Here, the structure of the sealing material which is the main part in this Embodiment is demonstrated in detail. The first sealing material 25 is formed in the outer peripheral region 40 where the underlying dielectric layer 19 of the back substrate 17 is not formed and the glass surface is exposed. Further, the first sealing material 25 contains a plurality of dispersed large-diameter granular materials 29 serving as first beads having a diameter larger than the combined height of the partition wall 20 and the underlying dielectric layer 19. The first sealing material 25 is obtained by adding a filler to frit glass. The large-diameter granular material 29 is, for example, a glass bead having a melting point higher than that of the first sealing material 25, and has an effect of contacting the protective layer 16 and the back substrate 17 of the front substrate 11 and keeping the distance therebetween constant. . Since the first sealing material 25 is formed on the smooth glass back substrate 17 and the smooth protective layer 16, the first sealing material 25 is tightly sealed and does not leak.

  Similarly, a second sealing material 28 is formed in a frame shape in the inner peripheral region 41 inside the first sealing material 25 where the underlying dielectric layer 19 is formed, and the second sealing material 28 is formed. Contains a plurality of small-diameter granular materials 30 serving as second beads having a diameter smaller than that of the large-diameter granular material 29 by the thickness of the underlying dielectric layer 19. The second sealing material 28 is the same material as the first sealing material 25. The small-diameter granular material 30 is a glass bead similar to the large-diameter granular material 29, and is in contact with the protective layer 16 of the front substrate 11 and the base dielectric layer 19 of the rear substrate 17, and these are similar to the large-diameter granular material 29 There is an effect of keeping the interval of the constant.

  The large-diameter granular material 29 and the small-diameter granular material 30 do not necessarily need to be spherical, but may be any granular material having a certain height, such as a cylinder or a cube, and is not necessarily glass and is sealed. Any substance having a higher melting point than the material may be used.

  As described above, according to the PDP 10 in the present embodiment, the outer peripheral region 40 of the base dielectric layer 19 and the inner peripheral region 41 of the base dielectric layer 19 are distinguished, and the large-diameter granular material 29 is disposed in each. The 2nd sealing material 28 which has arrange | positioned the 1st sealing material 25 and the small diameter granular material 30 is formed. As a result, the gap between the front substrate 11 and the rear substrate 17 can be made constant at two points in the plane direction, and the PDP 10 can be realized in which generation of auditory noise and crosstalk is suppressed.

  Further, since the front substrate 11 and the rear substrate 17 are supported at two points in the outward direction, the pressing force for pressing the front substrate 11 and the rear substrate 17 is increased by the large-diameter granular material 29 and the small-diameter granular material 30. Can be dispersed. As a result, even when the large-diameter granular material 29 abuts on the data electrode 18 formed on the back substrate 17 as shown in FIG. 2, disconnection, breakage, and deformation of the data electrode 18 can be suppressed.

(Embodiment 2)
Next, a method for manufacturing the PDP 10 described in the first embodiment will be described. FIG. 3 is a flowchart showing a manufacturing process of the PDP 10 in the embodiment. Hereinafter, description will be given according to the flowchart with reference to FIGS.

(1) Front substrate manufacturing step First, a step of manufacturing the front substrate 11 will be described. Wide transparent electrodes 12a and 13a made of a conductive metal oxide such as indium tin oxide (ITO) are formed on a glass front substrate 11 by a thin film process or the like by a thin film process and a photolithography method. Next, a paste containing a conductive material such as silver is formed on the transparent electrodes 12a and 13a in a line shape by screen printing, and this is baked and solidified at a predetermined temperature to form the scanning electrodes 12 and the sustain electrodes 13. To do. Scan electrode 12 and sustain electrode 13 form a pair to form display electrode pair 14. Next, a paste containing bismuth oxide low-melting glass or the like is applied so as to cover the display electrode pair 14 by a die coating method or the like, and then fired and solidified to form the dielectric layer 15. Next, a protective layer 16 made of magnesium oxide or the like is formed by vacuum deposition so as to cover the dielectric layer 15. Next, the front substrate 11 is completed by the above steps.

(2) Back Substrate Manufacturing Step Next, steps for manufacturing the back substrate 17 will be described. First, a paste containing a conductive material such as silver is formed on a glass back substrate 17 in a plurality of parallel lines by screen printing. This is fired at a predetermined temperature and solidified to form the data electrode 18. Next, a paste containing bismuth oxide low-melting glass and titanium oxide particles is applied by a die coating method so as to cover the data electrode 18. Thereafter, this is baked and solidified to form a base dielectric layer 19. Next, a paste containing a low melting point glass or a filler is applied on the base dielectric layer 19. Thereafter, patterning is performed in a cross pattern using a photolithography method or a sandblast method. Further, this is fired and solidified to form the partition walls 20. Next, a phosphor paste containing phosphor materials of red, green, and blue colors is applied to the surface of the base dielectric layer 19 and the side surfaces of the partition walls 20 by a printing method or the like. Thereafter, the phosphor layer 23 is formed by drying and baking the resultant. The back substrate 17 is completed through the above steps.

  The underlying dielectric layer 19 is formed in the inner peripheral region 41 excluding the outer peripheral region 40 of the back substrate 17. The back substrate 17 is completed through the above steps.

(3) Sealing material application step The sealing material application step is a step of applying the first sealing material 25 and the second sealing material 28 around the back substrate 17 (outside the image display area).

  In the present embodiment, first, after the first sealing material 25 is applied, the large-diameter granular material 29 serving as the first beads for keeping the distance between the front substrate 11 and the rear substrate 17 constant is first sealed. An example in which the material 25 is dispersed and arranged will be described.

  FIG. 4 is a diagram showing a method of spraying and arranging the application of the first sealing material 25 and the large-diameter granular material 29 in the present embodiment. As shown in FIG. 4, a paste-like first sealing material 25 obtained by kneading glass frit and filler with an organic solvent is a region where the base dielectric layer 19 of the back substrate 17 is not formed using the dispenser 42. It is applied around the outer peripheral region 40. Thereafter, a large-diameter granular material 29 made of glass beads is discharged from a nozzle 43 disposed near the dispenser 42. In this way, the large-diameter granular material 29 can be dispersed and arranged in the applied first sealing material 25. The nozzle 43 communicates with a storage container (not shown) for the large-diameter granular material 29, and the large-diameter granular material 29 can be discharged at regular intervals by vibrating the nozzle 43 or discharging air. Following the movement of the dispenser 42, the nozzle 43 is moved, and the large-diameter granular material 29 can be disposed at regular intervals in the first sealing material 25 by discharging the large-diameter granular material 29 at regular intervals. .

  According to such a method, beads are agglomerated when beads are kneaded into the sealing material paste and discharged. According to the present embodiment, the beads are applied to the outer peripheral region 40 of the back substrate 17. The large-diameter granular material 29 serving as the first bead can be reliably dispersed and arranged on the first sealing material 25. Therefore, the gap between the front substrate 11 and the rear substrate 17 can be made constant. As a result, it is possible to manufacture the PDP 10 in which generation of audible noise and crosstalk are suppressed.

  Similarly, the application of the second sealing material 28 formed in the inner peripheral region 41 on the base dielectric layer 19 and the dispersive arrangement of the small-diameter granular material 30 serving as the second beads can be reliably performed. At this time, the particle diameter of the small-diameter granular material 30 is made smaller than the particle diameter of the large-diameter granular substance 29 by the film thickness of the underlying dielectric layer 19.

  FIG. 5 is a diagram showing another example of the sealing material application step in the present embodiment. In the above description, the application of the first sealing material 25 and the second sealing material 28 and the dispersal arrangement of beads on the respective sealing materials are performed separately. FIG. 5 is a diagram showing a method of performing them simultaneously.

  That is, as shown in FIG. 5, the first sealing material 25 and the second sealing material 28 are the same third sealing material 32, and the discharge width of the dispenser 44 is set to the first sealing material 25 and the second sealing material 32. The width is equal to the application width of the dressing 28. A nozzle 43 and a small-diameter granular material 30 for discharging the large-diameter granular material 29 are provided on the third sealing material 32 having a wider coating width so as to correspond to the positions of the first sealing material 25 and the second sealing material 28. Discharge nozzles 45 are arranged to discharge the larger-diameter granular material 29 and the smaller-diameter granular material 30 respectively.

  According to such a method, by defining the nozzle position, the third sealing material 32 applied to the back substrate 17 is placed at a predetermined position in the outer peripheral region 40 of the base dielectric layer 19 and the inner peripheral region 41 thereof. The large-diameter granular material 29 and the small-diameter granular material 30 can be dispersed and arranged. According to such a method, productivity of sealing material application can be increased.

  In FIGS. 4 and 5, the large-diameter granular material 29 and the small-diameter granular material 30 that serve as beads are dispersed immediately after the sealing material paste is discharged from the dispensers 42 and 44 and applied to the back substrate 17. However, after the applied paste is dried and its fluidity is suppressed, the beads can be positioned more reliably if they are dispersed.

(4) Sealing Step The sealing step is a step in which the front substrate 11 and the back substrate 17 are attached and sealed with the first sealing material 25 and the second sealing material 28. FIG. 6 is a diagram showing a firing apparatus used for the sealing step, exhaust step, and discharge gas supply step of the PDP 10 in the embodiment. In FIG. 6, only the first sealing material 25 is shown and described as the sealing material. In FIG. 6, after the front substrate 11 and the back substrate 17 coated with the first sealing material 25 around the front substrate 11 and the surroundings are arranged opposite to each other with the partition wall 20 interposed therebetween in the firing furnace 51 incorporating the heater 50. Then, temporarily fix it with a clip (not shown). The glass exhaust pipe 31 is connected to a pipe 52 and further connected to an exhaust device 54 via a valve 53, to a discharge gas supply device 56 via a valve 55, and to a replacement gas supply device 58 via a valve 57. ing. In FIG. 7, the partition 20 in the PDP 10 and the like are omitted.

  In such a firing furnace 51, first, the heater 50 is turned on to raise the temperature of the firing furnace 51. At the same time, the valve 53 is opened, the exhaust device 54 is operated, and the exhaust of the discharge space 26 is started. Thereby, most of the impure gas contained in the paste of the first sealing material 25 is discharged together with the air in the discharge space 26. When the temperature inside the firing furnace 51 becomes equal to or higher than the softening point temperature of the first sealing material 25, the first sealing material 25 is softened and melted, and the front substrate 11 and the back substrate 17 are sealed. At this time, since the large-diameter granular material 29 is arranged on the first sealing material 25 at regular intervals, the front substrate 11 and the back substrate 17 are abutted evenly to keep these intervals at a prescribed size. Can do. Although not shown in FIG. 6, since the second sealing material 28 is actually formed, the distance between the front substrate 11 and the rear substrate 17 can be more reliably maintained constant.

(5) Exhaust step The exhaust step is a step of exhausting the gas inside the PDP 10. First, the valve 53 is closed, the exhaust by the exhaust device 54 is terminated, the valve 57 is opened, and a replacement gas such as oxygen flows from the replacement gas supply device 58 into the discharge space 26 in the PDP 10 at a pressure of about 10,000 to 80,000 Pa, for example. Let The replacement gas is for replacing the impure gas remaining after adhering to the components inside the PDP 10. Next, the heater 50 is turned off, the valve 57 is closed, the supply of oxygen from the replacement gas supply device 58 is stopped, the valve 53 is opened, the exhaust device 54 is operated, and the replacement gas in the discharge space 26 is evacuated.

(6) Discharge gas supply step The discharge gas supply step is a step of supplying a discharge gas mainly composed of neon (Ne) and xenon (Xe) into the evacuated discharge space 26. The valve 53 is closed and the exhaust device 54 is stopped, and the valve 55 is opened to supply discharge gas from the discharge gas supply device 56. In this embodiment, a mixed gas of xenon (Xe): 10% and neon (Ne): 90% was used and supplied at a pressure of 60 kPa. However, the discharge gas is not limited to this, and may be, for example, xenon (Xe): 100% gas. Thereafter, the bulb 55 is closed and the discharge gas supply from the discharge gas supply device 56 is stopped. Thereafter, the exhaust pipe 31 is heated and sealed with a burner or the like (chip off). The assembly of the PDP 10 is completed through the above steps. Thereafter, aging is performed to stabilize the characteristics by applying a voltage between the electrodes of the PDP 10 for a certain period of time to complete the PDP 10.

  As described above, according to the method for manufacturing PDP 10 in the present embodiment, the beads can be arranged at predetermined positions of the sealing material, and the distance between the front substrate and the rear substrate can be maintained at a prescribed size. Can do. As a result, it is possible to realize a high-quality and high-quality display device by suppressing audible noise and crosstalk generated when the front substrate and the rear substrate come into contact with each other and vibrate.

  According to the PDP according to the present invention, the distance between the front substrate and the rear substrate can be maintained at a predetermined size, and therefore, it is widely useful for an image display device configured by bonding two substrates.

10 PDP
DESCRIPTION OF SYMBOLS 11 Front substrate 12 Scan electrode 12a, 13a Transparent electrode 12b, 13b Bus electrode 13 Sustain electrode 14 Display electrode pair 15 Dielectric layer 16 Protective layer 17 Back substrate 18 Data electrode 19 Base dielectric layer 20 Bulkhead 23 Phosphor layer 24 Discharge cell 25 1st sealing material 26 Discharge space 27 Exhaust hole 28 2nd sealing material 29 Large diameter granular material 30 Small diameter granular material 31 Exhaust pipe 32 3rd sealing material 40 Outer peripheral area 41 Inner peripheral area 42,44 Dispenser 43,45 Nozzle 50 Heater 51 Firing furnace 52 Piping 53, 55, 57 Valve 54 Exhaust device 56 Discharge gas supply device 58 Replacement gas supply device

Claims (2)

A front substrate on which a plurality of display electrode pairs parallel to each other, a dielectric layer, and a protective layer are formed; a back substrate on which a plurality of data electrodes, a base dielectric layer, barrier ribs, and a phosphor layer are formed in parallel to each other; Is a plasma display panel that is placed opposite to the partition wall so as to form a discharge space therebetween, and is surrounded by a sealing material, and the underlying dielectric layer is formed on the inner side of the back substrate excluding the outer peripheral region. A first bead is provided in the peripheral region, and the sealing material is composed of a first sealing material provided in the outer peripheral region and a second sealing material provided in the inner peripheral region. And the second bead is disposed on the second sealing material, and the particle size of the first bead is made larger than the particle size of the second bead by the film thickness of the underlying dielectric layer. A plasma display panel characterized by 2. The plasma display panel according to claim 1, wherein the particle diameter of the first bead is larger than the particle diameter of the second bead by the film thickness of the base dielectric layer.

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