JP4241201B2 - Plasma display panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display panel (PDP) known as a thin, lightweight image display device having a large screen.
[0002]
[Prior art]
In recent years, PDPs have attracted attention as display panels (thin display devices) with excellent visibility.
[0003]
This PDP is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. From the viewpoint of high definition, large screen, and ease of manufacture, At present, AC type and surface discharge type PDPs have become the mainstream.
[0004]
FIG. 5 shows a schematic configuration of a conventional PDP in a cross-sectional perspective view. FIG. 6 is a plan view showing a schematic configuration of a conventional PDP.
[0005]
The front plate 2 of the PDP 1 is formed with a plurality of display electrodes 6 composed of scan electrodes 4 and sustain electrodes 5 on a transparent and insulating substrate 3, and a dielectric layer 7, a protective layer 8, Is formed. The scan electrode 4 and the sustain electrode 5 are respectively composed of transparent electrodes 4a and 5a and bus electrodes 4b and 5b formed thereon. The back plate 9 of the PDP has a plurality of address electrodes 11 formed on an insulating substrate 10, and a dielectric layer 12 so as to cover it, and a partition wall 13 parallel to the address electrodes on the dielectric layer 12. The phosphor layers 14R, 14G, and 14B corresponding to the respective colors of red, green, and blue are formed on the surfaces of the dielectric layer 12 and the partition wall 13.
[0006]
The front plate 2 and the back plate 9 are arranged to face each other so as to form the discharge space 15 with the partition wall 13 interposed therebetween so that the display electrode 6 and the data electrode 11 are orthogonal to each other.
[0007]
The intersection between the display electrode 6 and the data electrode 11 functions as a discharge cell 16 (unit light emitting region), and a discharge gas is sealed in the discharge cell 16, and a voltage is generated between the display electrode 6 and the data electrode 11. Is applied to the phosphor layers 14R, 14G, and 14B provided in the discharge cells 16 to generate visible light and display an image.
[0008]
Here, as shown in FIG. 6, the front plate 2 and the back plate 9 of the PDP 1 are configured to be joined outside the image display region 17 by a sealing material 18 such as a low-melting glass material. FIG. 6 shows the relative positional relationship between the partition wall 13 and the sealing material 18, and some components are omitted.
[0009]
In the process of manufacturing the PDP 1 having the above-described configuration, the front plate 2 and the back plate 9 are sandwiched between the front plate 2 and the sealing material 18 disposed in the peripheral portion outside the image display area 17. A sealing step in which the pressing force is applied by placing the back plate 9 oppositely and sandwiching it with a clip or the like, and joining in such a state by heating to the softening temperature of the sealing material 18, and after sealing, For the purpose of discharging the impure gas in the discharge space 15, an exhaust baking process is performed in which the inside of the PDP 1 is heated and exhausted by the exhaust means through the exhaust hole 19 (see, for example, Non-Patent Document 1).
[0010]
[Non-Patent Document 1]
Co-authored by Hioki Uchiike and Shigeo Miko, “All about Plasma Displays”, Industrial Research Committee, May 1, 1997, p79-80, p102-p105
[0011]
[Problems to be solved by the invention]
Here, the arrangement of the sealing material 18 around the front plate 2 and / or the back plate 9 is performed by drawing and applying a low-melting glass material with a dispenser or the like, giving priority to the simplicity of the construction method. Done. At this time, since the start end and the end end are generated in the coating, the start end and the end end are disposed in an overlapped state in order to complete the sealing performance. Therefore, the disposed sealing material 18 has a connecting portion that is a portion where the start end and the end end overlap.
[0012]
In the sealing step, the front plate 2 and the rear plate 9 are arranged to face each other and are heated while being pressed with a clip or the like so that the sealing material 18 is crushed. Since the thickness of the material 18 is large, as shown in FIG. 6, the seal member 20 becomes wider than the other seal portions.
[0013]
On the other hand, in the exhaust baking process, the impure gas in the discharge space 15 of the PDP 1 is exhausted through the exhaust hole 19 provided in at least one of the front plate 2 or the back plate 9. Here, the impure gas is discharged from the components formed on the front plate 2 and the back plate 9 in the PDP 1, and therefore the path for discharging is as shown in FIG. After passing through the discharge space 15 divided by 13 (arrow A in the figure) and passing between the region where the partition wall 13 is formed and the sealing material 18 (arrow B in the figure), it is discharged through the exhaust hole 19. It becomes that.
[0014]
Therefore, if a wide seal portion 20 exists between the seal material 18 and the region where the partition wall 13 is formed, which is a part of the exhaust path, the exhaust passage becomes narrow at that portion, and the exhaust resistance is reduced. As a result, the impure gas in the PDP 1 may not be discharged well. In this case, the remaining impure gas may adversely affect the characteristics of the discharge in the PDP 1 and may cause a problem that the display of an image is hindered.
[0015]
The present invention has been made in view of the above problems, and an object of the present invention is to realize a plasma display panel excellent in image display characteristics by discharging impurities in a PDP satisfactorily.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, a plasma display panel according to the present invention has a front panel and a rear panel arranged to face each other so as to form a discharge space with a partition interposed therebetween, and is joined by a sealing material outside the image display area. In the sealing material, the portion where the thickness is increased by overlapping the start end and the end of the seal material is crushed in the sealing step, so that the seal portion is wider than the other seal portions. It has a joint , and this joint is placed so that the start and end of the sealing material overlap so that the position where the gap between the region where the partition wall is formed and the sealing material is avoided is minimized. it is characterized in that it has set.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
That is, the invention according to claim 1 of the present invention is a plasma display panel in which a front plate and a back plate are arranged to face each other so as to form a discharge space across a partition wall and are joined by a sealing material outside an image display region. The seal material is thicker than the other seals by crushing the part where the thickness is increased due to the overlap between the start and end of the seal material in the sealing process . It has a connecting part, and this connecting part is placed so that the start and end of the sealing material overlap so that the position where the distance between the region where the partition wall is formed and the sealing material is minimized is avoided . This is a plasma display panel characterized by the above.
[0022]
Hereinafter, a PDP according to an embodiment of the present invention will be described.
[0023]
FIG. 1 is a cross-sectional perspective view showing a schematic structure of a PDP according to an embodiment of the present invention.
[0024]
FIG. 2 is also a plan view showing a schematic configuration of a PDP according to an embodiment of the present invention.
[0025]
The front plate 22 of the PDP 21 is formed with a plurality of display electrodes 26 including scanning electrodes 24 and sustaining electrodes 25 on a transparent and insulating substrate 23, and a dielectric layer 27, a protective layer 28, Is formed. The scan electrode 24 and the sustain electrode 25 are composed of transparent electrodes 24a and 25a and bus electrodes 24b and 25b formed thereon, respectively. The back plate 29 of the PDP 21 has a plurality of address electrodes 31 formed on an insulating substrate 30 and a dielectric layer 32 so as to cover it, and a partition wall 33 is formed on the dielectric layer 32 in parallel with the address electrodes. The phosphor layers 34R, 34G and 34B corresponding to the respective colors of red, green and blue are formed on the surfaces of the dielectric layer 32 and the partition wall 33.
[0026]
The front plate 22 and the back plate 29 are opposed to each other so as to form a discharge space 35 with a partition wall 33 interposed therebetween so that the display electrode 26 and the data electrode 31 are orthogonal to each other.
[0027]
The intersection between the display electrode 26 and the data electrode 31 functions as a discharge cell 36 (unit light emitting region). A discharge gas is sealed in the discharge cell 36, and a voltage is generated between the display electrode 26 and the data electrode 31. Is applied to the phosphor layers 34R, 34G, and 34B provided in the discharge cell 36, and visible light is generated to display an image.
[0028]
Here, as shown in FIG. 2, the front plate 22 and the back plate 29 of the PDP 21 are joined outside the image display region 37 by a sealing material 38 such as a low melting point glass material. FIG. 2 shows the relative positional relationship between the partition wall 33 and the sealing material 38, and some components are omitted.
[0029]
In the process of manufacturing the PDP 21 having the above-described configuration, the front plate 22 and the back plate 29 are sandwiched with the sealing material 38 disposed in the peripheral portion outside the image display area 37 of at least one of the front plate 22 and the back plate 29. And a sealing step for joining in an airtight state by heating to the softening temperature of the sealing material 38 in that state, with the pressing force being applied by sandwiching them with clips and the like, and sealing Thereafter, for the purpose of discharging the impure gas in the discharge space 35, an exhaust baking process is performed in which the inside of the PDP 21 is heated by the exhaust means through the exhaust holes 39 while being heated.
[0030]
Here, the impure gas is discharged from the components formed on the front plate 22 and the back plate 29 in the PDP 21, and therefore the path for discharging is the same as that shown in FIG. 7. Then, after passing through the discharge space 35 partitioned by the partition wall 33, between the region where the partition wall 33 is formed and the sealing material 38, it is discharged through the exhaust hole 39. Here, in order to improve the exhaust efficiency with respect to the PDP 21, it is effective to increase the exhaust speed at the time of exhaust. For this purpose, it is preferable to increase the cross-sectional area of the portion serving as the exhaust path as much as possible.
[0031]
That is, when the sealing material 38 is disposed by applying the dispenser method with priority given to the simplicity of the construction method, that is, there is a connecting portion where the starting end and the terminal end overlap each other when the sealing material 38 is disposed. It is preferable to provide the connecting portion so as to avoid a position where the distance between the region where the partition wall 33 is formed and the seal 38 material is minimized.
[0032]
Therefore, in the PDP 21 according to the embodiment of the present invention, the sealing material 38 is drawn and applied by a dispenser or the like with a low-melting glass material on the periphery of the front plate 22 and / or the back plate 29 outside the image display area 37. In this case, in order to ensure the sealing performance by sealing, the start end and end of the seal material 38, that is, the start end and end of the application of the low melting point glass material are overlapped. The seal material 38 is not interrupted, but the overlapping portion is a position where the gap between the region where the partition wall 33 is formed and the seal 38 material is minimized, in FIG. The long side of the PDP 21 is provided to avoid it. In addition, when the sealing material 38 is disposed, the application is performed so that the overlap between the start end and the end end is at this position.
[0033]
With such a configuration, when the front plate 22 and the back plate 29 are joined in a state of being opposed to each other, as shown in FIG. 2, the seal portion at the joint portion where the start end and the end portion overlap is used as another seal. Even if the seal portion 20 is wider than the portion, the position is a position that avoids the position where the space between the region where the partition wall 33 is formed and the seal 38 material is minimized. The cross-sectional area of the path is not significantly reduced. Therefore, the increase in exhaust resistance when the impure gas in the discharge space 35 of the PDP 21 is exhausted is suppressed, and the impure gas is discharged well.
[0034]
FIG. 3 also shows a plan view of a schematic configuration of a PDP according to an embodiment of the present invention. In FIG. 3, some configurations are omitted.
[0035]
In the configuration shown in FIG. 3 as well, in the same manner as in the above-described embodiment, the dispenser method is applied and the sealing material 38 is applied and disposed. The connecting portion, which is the portion where the start and end of the arrangement of the sealing material 38 overlap, is located farthest from the exhaust hole 39, that is, a position that is substantially point-symmetric with the exhaust hole 39 in the PDP 21. is there. As a result, when the front plate 22 and the back plate 29 are joined in a state of being opposed to each other, as shown in FIG. 3, the seal portion at the joint portion is wider than the other seal portions. Even if it is, the position is the position farthest from the exhaust hole 39, so that it is a position where the impure gas passage probability is low in the exhaust path. It is suppressed that the discharge | emission of is inhibited, and is discharged | emitted favorably.
[0036]
FIG. 4 also shows a plan view of a schematic configuration of a PDP according to an embodiment of the present invention. In FIG. 4, some configurations are omitted.
[0037]
In the configuration shown in FIG. 4, the sealing material 38 is arranged in a state where there is no connecting portion that is a portion where the start end and the end end overlap.
[0038]
As a method of disposing the sealing material 38 in such a state, for example, a method of applying a low-melting glass material that is a material of the sealing material 38 by screen printing can be mentioned.
[0039]
Since the sealing material 38 arranged in this way has a uniform width when arranged and no wide portion is generated in the width of the sealing portion, the exhaust resistance viewed from the exhaust hole 39 is minimized, A PDP 21 with good exhaust efficiency can be realized.
[0040]
【Example】
In order to verify the effects of the present invention, based on the above-described embodiment, PDP 1 or 21 panels 1 to 4 having the specifications described below were manufactured and performance evaluation experiments were performed.
[0041]
First, in any of the panels 1 to 4, a low-melting glass material is used as the sealing materials 18 and 38 and disposed on the back plates 9 and 29. The exhaust holes 19 and 39 are provided at the corners of the back plates 9 and 29. The distance between the region where the partition walls 13 and 33 are formed and the sealing materials 18 and 38 is 10 mm on the short side of the PDPs 1 and 21 and 5 mm on the long side.
[0042]
In the panels 1 to 4, only the arrangement of the sealing materials 18 and 38 is different. That is, the sealing material 38 of the panel 1 is disposed by a screen printing method as in the configuration shown in FIG. Further, the sealing material 38 of the panel 2 is disposed by a dispenser method as in the configuration shown in FIG. 2, and the connecting portion where the start end and the end of the disposition are overlapped on the short side of the panel 2. By providing it, the wide seal portion 20 is positioned at that position. Further, the sealing member 38 of the panel 3 is disposed by a dispenser method as in the configuration shown in FIG. 3, and a connecting portion that is a portion where the start end and the end end of the disposition are overlapped with the exhaust hole 39 diagonally. By providing the corner portion corresponding to the position, the wide seal portion 20 is positioned at that position. Further, the sealing material 18 of the panel 4 is disposed by a dispenser method as in the configuration shown in FIG. 6, and a connecting portion, which is a portion where the start end and the end of the disposition are overlapped, is formed on the long side portion of the panel 4. By providing it, the wide seal portion 20 is positioned at that position. In the above, the wide seal portion 20 which is a seal portion in the joint portion is about 2 mm larger than the width in the other seal portions.
[0043]
In the above panels 1 to 4, through holes were provided at positions substantially diagonal to the exhaust holes 19 and 39, and a vacuum gauge was attached in the vicinity thereof. Then, the inside of the panel was evacuated through the exhaust holes 19 and 39, and the change with time in the diameter of the pressure inside the panel was measured from atmospheric pressure (100 kPa) to 1 Pa with a vacuum gauge. As a result, it was found that the panel 2 can be evacuated to 1 Pa in 0.7 times, and the panels 1 and 3 can be exhausted 0.6 times in time. In addition, as a result of producing, lighting, and evaluating a panel in which the exhaust time was set to 5 hours for panel 4 , 3.5 hours for panel 2, and 3 hours for panels 3 and 1 in the above panel configuration, all panels The same good display characteristics were obtained.
[0044]
From the above, according to the panel to which the present invention is applied, it was confirmed that the same image display as before can be performed with a shorter exhaust time than before.
[0045]
In the above embodiment, the plasma display panel has been exemplified. However, the present invention can be applied to all display panels having an exhaust process in which the panel is hermetically sealed.
[0046]
【The invention's effect】
As described above, according to the present invention, it is possible to discharge the impurity gas in the PDP satisfactorily, and it is possible to realize a plasma display panel excellent in image display characteristics.
[Brief description of the drawings]
FIG. 1 is a cross-sectional perspective view illustrating a schematic configuration of a plasma display panel according to an embodiment of the present invention. FIG. 2 is a plan view illustrating a schematic configuration of a plasma display panel according to an embodiment of the present invention. FIG. 4 is a plan view showing a schematic configuration of a plasma display panel according to an embodiment of the present invention. FIG. 4 is a plan view showing a schematic configuration of a plasma display panel according to an embodiment of the present invention. FIG. 6 is a plan view showing a schematic configuration of a conventional plasma display panel. FIG. 7 is a plan view showing an exhaust path during exhaust in the plasma display panel.
20 Wide seal portion 21 Plasma display panel 22 Front plate 29 Back plate 33 Bulkhead 35 Discharge space 38 Sealing material 39 Exhaust hole

Claims (1)

In a plasma display panel in which a front plate and a back plate are arranged to face each other so as to form a discharge space with a partition wall interposed therebetween, and the sealing material is joined by a sealing material outside the image display area, DOO thickness was thickened portion by overlapping, has a connecting portion which becomes wider seal portion width than the other sealing portion by being crushed in the sealing step, the connecting portion, the partition wall is formed A plasma display panel characterized in that a starting end and an end of a sealing material are disposed so as to avoid a position where a gap between the formed region and the sealing material is minimized.

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