JP2003217457A - Plasma display panel and plasma display panel manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel having improved exhaust conductance and exhaust efficiency in the exhaust process of the plasma display panel, without adding a special structure. <P>SOLUTION: In a conventional structure of a plasma display panel, a long-side exhaust path width W1 is, generally, not greater than a short-side exhaust path width Ws. It is found from the result of the calculation of exhaust conductance and the way of simulation that the long-side exhaust path width W1 gives great influences on the improvement of the exhaust efficiency of the panel. In this structure, a long-side exhaust path width W1 is greater than a short-side exhaust path width Ws and so the long-side exhaust path width W1 is kept sufficient, thereby improving the exhaust conductance and exhaust efficiency of the PDP. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exhaust path structure for a plasma display panel (hereinafter also referred to as "PDP") and a manufacturing method thereof.

[0002]

2. Description of the Related Art FIGS. 13A and 13B show structures of a front substrate and a rear substrate of an AC type PDP having typical stripe-shaped partition walls. 1 is a rear substrate, 2 is a front substrate, 3 is a panel sealing portion, 4 is a stripe-shaped partition wall, 5 is a phosphor, 6 is an address electrode, 7 is a rear substrate dielectric layer, 8 is a scan / sustain electrode, 9 Is a dielectric layer for a front substrate, 10 is a protective film, 14
Indicates an exhaust hole.

On the front substrate 2, after the scan / sustain electrodes 8 are formed, a front substrate dielectric layer 9 and a protective film 10 are sequentially formed so as to cover them. On the other hand, on the rear substrate 1, after the address electrodes 6 are formed, the rear substrate dielectric layer 7 is formed so as to cover the address electrodes 6, and the stripe-shaped barrier ribs 4 for partitioning the discharge space are further formed thereon. ing. A phosphor 5 that emits ultraviolet rays due to discharge is applied to the side surface and the bottom portion of the partition wall that partitions the discharge space.

In an AC type PDP having a typical stripe-shaped partition, the rear substrate 1 and the front substrate 2 shown in FIGS. 13 (a) and 13 (b) are arranged in the direction of the address electrode 6 and the direction of the scan / sustain electrode 8. And the surfaces where the address electrodes 6 are formed and the surfaces where the scan / sustain electrodes 8 are formed face each other. The back substrate 1 and the front substrate 2 are bonded together by frit glass in which the position of the panel sealing portion 3 is formed. Here, the conventional PDP
, The long side exhaust path width Wl is the short side exhaust path width Ws
It is generally the following. The long side exhaust path width Wl and the short side exhaust path width Ws are defined in Embodiment 1 described later.

Next, a method of manufacturing such a conventional PDP will be described. First, a transparent electrode such as ITO (indium tin oxide) or the like is formed on the front substrate 2 by a photolithography method, and a mother electrode is formed on a part of the transparent electrode with a conductive material such as silver. The front substrate dielectric layer 9 is formed so as to cover the scan / sustain electrodes thus formed and fired, and a protective film 10 made of magnesium oxide or the like is formed thereon for production.

For the back substrate 1, a conductive material such as silver is used and the address electrodes 6 are formed by photolithography.
To form. A dielectric layer 7 for a back substrate is formed so as to cover it, baked, and a partition wall material is formed on the entire surface by printing. After that, a portion where the stripe-shaped partition wall 4 is not formed is scraped off by a sandblasting method, and a stripe shape is formed through a firing process. The partition wall 4 is formed. Then, the phosphor 5 is applied to each of the side and bottom surfaces of the stripe-shaped partition wall 4 by a printing method for each color of red, green, and blue, and dried and fired to manufacture.

After the glass frit is applied to the position of the panel sealing portion 3 of the back substrate 1 thus manufactured, it is bonded to the front substrate 2 and fired for sealing. The panel after sealing is filled with a gas in which xenon (Xe) that generates ultraviolet rays by discharge and neon (Ne) as a main discharge gas are mixed in a discharge space through an exhaust process of drawing a vacuum from the exhaust hole 14. These steps complete the PDP.

Here, in the exhaust process, the internal structure of the PDP is partitioned by the stripe-shaped partition walls 4 having a pitch of several hundred μm and a height of 100 to 200 μm.
The exhaust conductance of the panel is small and it takes time to exhaust. Further, there is a PDP having a structure in which the stripe-shaped partition wall 4 is a grid-shaped partition wall 11 as shown in FIGS. 14A and 14B in order to improve the display brightness and contrast. In the PDP having this structure, the gas flow in the direction parallel to the address electrode 6 is obstructed by the partition walls, so that the exhaust conductance is lower than that of the PDP having the striped partition wall 4 structure and the exhaust time becomes longer.

Therefore, in Japanese Patent Laid-Open No. 2001-236891, as shown in FIGS. 15 (a) and 15 (b), the height of a partition wall formed perpendicularly to the address electrode 6 is defined as the address electrode 6.
Invented is a PDP having a lattice-shaped barrier rib 12 structure with steps lower than the barrier ribs formed in parallel with. As a result, the flow of gas in the direction parallel to the address electrodes 6 can be secured, and the exhaust conductance can be prevented from lowering even with the lattice-shaped partition walls, so that the exhaust time can be shortened.

As a method of increasing the exhaust conductance to shorten the exhaust time, Japanese Patent Laid-Open No. 11-23846.
There is a method of providing a groove in the non-display area of the back substrate 1 and the front substrate 2 as in Japanese Patent Laid-Open No. As shown in FIG. 16, this groove is formed so as to be parallel to the address electrode 6 on the rear substrate 1 and parallel to the scan / sustain electrode 8 on the front substrate 2. By forming the groove in this way, it is possible to form an exhaust path that connects the entire circumference of the non-display area when the back substrate 1 and the front substrate 2 are bonded together. Therefore,
The PDP having the structure of 6 has a large exhaust conductance and can shorten the exhaust time.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The PDP having the stepped grid-like partition structure described in Japanese Patent Application Laid-Open No. 001-236891 has an improved exhaust conductance and a shorter exhaust time than a PDP having a conventional grid-like partition structure. However, compared with the PDP having the stripe-shaped partition structure, the PDP having the stepped grid-shaped partition structure still has low exhaust conductance and a long exhaust time. Further, there is a problem that the manufacturing cost is increased because a step for forming steps on the grid-shaped partition wall is separately required.

Further, the method of forming a groove in the non-display area described in Japanese Patent Laid-Open No. 11-238466 has a problem that the step of forming the groove in the substrate is required and the manufacturing cost is increased. Further, the provision of the groove in the substrate lowers the mechanical strength of the substrate, and there is a problem that the substrate is more likely to be damaged by a process such as transportation and subsequent heat treatment.

The present invention has been made in order to solve the above problems, and increases the exhaust conductance while minimizing the non-display area to improve the exhaust efficiency and shorten the exhaust time. It is another object of the present invention to provide a PDP that can be manufactured by the same process as a conventional PDP manufacturing process and a manufacturing method thereof.

[0014]

According to a first aspect of the present invention, there is provided a pair of substrates, which are opposed to each other and have a long side portion and a short side portion, and an internal space between the pair of substrates. So as to have a sealing material that seals the periphery of the pair of substrates, and a partition wall that partitions the internal space provided in the pair of substrates and has an end formed inside the sealing material. In the plasma display panel, a first average distance from the sealing material on the long side portion side to the end of the partition wall on the long side portion side is from the sealing material on the short side portion side to the short side. It is characterized by being larger than the second average distance to the end of the partition wall on the part side.

The problem solving means according to claim 2 of the present invention is
The first average distance is (0.31 × diagonal screen inch size−6.76) millimeters or more.

The problem solving means according to claim 3 of the present invention is
A pair of substrates that are arranged to face each other and have a long side portion and a short side portion; a sealing material that seals the periphery of the pair of substrates so as to have an internal space between the pair of substrates; A plasma display panel having a partition wall that partitions the internal space provided on the substrate and has an end formed inside a sealing material, wherein the sealing material on the short side portion side to the short side portion Side, there is no exhaust path in the internal space to the end of the partition wall, and the exhaust path in the internal space from the sealing material on the long side portion side to the end of the partition wall on the long side portion side. Is present.

The problem solving means according to claim 4 of the present invention is
A protective wall having a height equal to or lower than that of the partition wall is further provided inside the sealing material.

The problem solving means according to claim 5 of the present invention is
A protection wall having a height equal to or lower than that of the partition wall is further provided only inside the long side along the sealing material.

A means for solving the problems according to claim 6 of the present invention is
The method of manufacturing a plasma display panel according to claim 4 or 5, wherein the protective wall is formed at the same time when the partition wall is formed.

[0020]

(First Embodiment) FIG. 1 is a schematic diagram showing a PDP exhaust structure according to a first embodiment of the present invention.
Reference numeral 1 is a rear substrate, 2 is a front substrate, 3 is a panel sealing portion, 4 is a stripe-shaped partition wall, 11 is a grid-shaped partition wall, 12 is a stepped grid-shaped partition wall, and 14 is an exhaust hole. Where PD
The average distance from the end of the partition wall on the long side of P to the panel sealing part on the side of the long side is defined as the long side exhaust path width Wl, and from the outermost partition end on the short side of the PDP to the short side. The average distance to the panel sealing part of is defined as the short side exhaust path width Ws.

In the first embodiment of the present invention, the conventional PDP is used.
In the above, the long side exhaust path width Wl was less than the short side exhaust path width Ws, but the long side exhaust path width Wl was made larger than the short side exhaust path width Ws to improve the exhaust conductance of the PDP. To improve exhaust efficiency.

In order to verify the improvement of the exhaust efficiency of the PDP,
First, the exhaust conductance of the PDP is calculated. Therefore, the structure in the PDP is considered as a simplified model in which the partition walls are formed in stripes in the space surrounded by the back substrate 1, the front substrate 2 and the panel sealing portion 3 as shown in FIG. . Here, the arrow in FIG. 2 shows the flow of gas when exhausted from the exhaust hole 14 provided in the corner part of PDP. That is, a plurality of rectangular conduits surrounded by the stripe-shaped partition walls 4 and a plurality of rectangular conduits surrounded by a region from the outermost partition wall end on the short side portion side of the PDP to the panel sealing portion on the short side portion side are arranged in parallel. In the model in which the pipes are connected to each other in series with the rectangular conduit surrounded by the region from the partition end on the long side of the PDP to the panel sealing part on the long side. It can be simplified. Here, the exhaust conductance C of the rectangular conduit can be obtained by the general formula 1.

[0023]

[Equation 1]

Where a is the width of the rectangular conduit, b is the height of the rectangular conduit, L is the length of the rectangular conduit, K is a correction factor, and ω is πV.
/ 4 and V represent the average velocity of gas molecules.

When using this simplified model, the diagonal size of the screen is 46 inches (116.84 mm), the number of display pixels is wide VGA (852 × 480 pixels), the height of the stripe-shaped partition wall is 140 μm, and the width is 100 μm. Calculate the exhaust conductance for the PDP. The results are shown in Fig. 3 (a).
It is shown in the graph A of (b). The graph A in FIG. 3A shows the results of the exhaust conductance when the long side exhaust path width Wl is fixed at 5.0 mm and the short side exhaust path width Ws is changed from 1 mm to 20 mm. Graph A in b) shows that the short side exhaust path width Ws is fixed at 5.0 mm and the long side exhaust path width Wl
The results of the exhaust conductance when changing from 1 mm to 20 mm are shown. From this result, the short side exhaust path width
Although the exhaust conductance is hardly changed even if Ws is changed, it is shown that when the long side exhaust path width Wl is changed, the exhaust conductance increases in proportion to the long side exhaust path width Wl.

Next, in the same PDP as above, the exhaust conductance in the case where the stripe-shaped partition wall is replaced with the stepped grid partition wall is calculated. Here, regarding the shape of the stepped grid partition, the height of the partition parallel to the short side of the PDP is 140 μm.
m, width 100 μm, height of partition wall parallel to long side of PDP is 1
The width is 35 μm and the width is 100 μm. The results are shown in Fig. 3 (a).
It is shown in graph B of (b). The graph B of FIG. 3A shows the results of the exhaust conductance when the long side exhaust path width Wl is fixed to 5.0 mm and the short side exhaust path width Ws is changed from 1 mm to 20 mm. Graph B in b) shows that the short side exhaust path width Ws is fixed at 5.0 mm and the long side exhaust path width Wl
The results of the exhaust conductance when changing from 1 mm to 20 mm are shown. From this result, the same tendency as in the case of the striped partition wall is shown, and the exhaust conductance is hardly affected even if the short side exhaust path width Ws is changed, but when the long side exhaust path width Wl is changed, It is shown that the exhaust conductance increases as the long side exhaust path width Wl increases.

The above calculation result of the exhaust conductance is
It is shown that the long side exhaust path width Wl greatly affects the improvement of the exhaust conductance. Also, FIG.
From (b), the exhaust conductance when the long side exhaust path width Wl is 10 mm in the PDP with striped partition walls is 9
It is x10E-5 (liter / second), and it is understood that the long side exhaust path width Wl should be about 14 mm in order to obtain the same exhaust conductance with the PDP having the stepped grid partition.

In the above, the exhaust conductance of the PDP is calculated by a simplified model, but in order to verify the improvement of the exhaust efficiency of the PDP in more detail, it is effective to simulate the pressure distribution in the panel during exhaust. Is. Here, a method of simulating the pressure distribution in the panel will be described. First, it is assumed that the amount of released gas generated in the panel is uniformly discharged over the entire surface of the panel. A PDP having striped barrier ribs is modeled as shown in FIG. The exhaust path formed between the partition walls and between the short side part side panel sealing part and the short side part side partition wall end is shown in the vertical direction of FIG. 5, and this is called a short side exhaust path. The exhaust path formed between the long side panel sealing part and the end of the long side partition is shown in the lateral direction of FIG. 5, and this is called the long side exhaust path, and in particular, the upper long side exhaust on the upper side of FIG. The path and the lower side are called the lower long side exhaust path. Here, assuming that n-1 partition walls are formed in the PDP, the amount of gas flowing in the short side exhaust path is Q1 to Q.
n, the amount of gas generated in the short side exhaust path region is Qh1 to Q
hn, the amount of gas generated in the upper long side exhaust path is Qu1-Q
u (n-1), gas amount Qd1 generated in the lower long side exhaust path
~ Qd (n-1), the conductance of the short side exhaust path is Ch
1 to Chn, the conductance of the upper long side exhaust path is Cu
1 to Cu (n-1), the conductance of the lower long side exhaust path is Cd1 to Cd (n-1), the pressure of the upper long side exhaust path branch is Pu1 to Pun, and the pressure of the lower long side exhaust path is It can be expressed as Pd1 to Pdn. Further, if the inlet pressure of each exhaust passage is Pi, the outlet pressure is Po, the exhaust passage conductance is C, the amount of gas generated in the exhaust passage portion is Qm, and the amount of gas flowing in the exhaust passage is Q, then the equation 2 is obtained. It holds.

[0029]

[Equation 2]

Therefore, for each exhaust path shown in FIG.
By applying and solving the simultaneous equations of those equations, the simulation for obtaining the pressure distribution in the panel can be performed.

Using the above-mentioned simulation method, the PDP when the diagonal diagonal size of the screen is 46 inches (116.84 mm), the number of display pixels is wide VGA (852 × 480 pixels), the height of the stripe-shaped partition wall is 140 μm, and the width is 100 μm. The long side exhaust path width Wl is 6 mm, and the short side exhaust path width Ws is 3 mm
Then, the result of the pressure distribution in the panel is shown in FIG.
The results show that the pressure in the panel has a large pressure difference on the long side, but little pressure difference on the short side. Next, when only the long side exhaust path width Wl is set to 12 mm without changing the short side exhaust path width Ws,
The result of the pressure distribution in the panel is shown in FIG. The result is
It is shown that the pressure difference on the long side is about half that when the long side exhaust path width Wl is 6 mm.

Next, using the same simulation method,
When the long side exhaust path width Wl is 6 mm and the short side exhaust path width Ws is 3 mm in the above PDP in which only the stripe type partition walls are changed to the stepped grid partition walls, the result of the pressure distribution in the panel is shown in FIG. Show. Here, regarding the shape of the stepped grid partition, the partition height parallel to the short side of the PDP is 140 μm, the width is 100 μm, and the partition height parallel to the long side of the PDP is 135 μ.
m and width are 100 μm. The result shows that the pressure inside the panel has a large pressure difference on the long side, but almost no pressure difference on the short side, as in the case of the PDP having the striped barrier ribs. Next, when the short side exhaust path width Ws is not changed and only the long side exhaust path width Wl is set to 12 mm, the result of the pressure distribution in the panel is shown in FIG. The result is that the pressure difference on the long side is 6
It is shown that it is about half of that in mm. The above simulation results also show that the long side exhaust path width Wl greatly affects the improvement of the exhaust efficiency of the panel.

Therefore, the structure of the conventional PDP is generally such that the long side exhaust path width Wl is less than or equal to the short side exhaust path width Ws. From the results of the above exhaust conductance calculation and simulation, It was found that the long side exhaust path width Wl greatly affects the improvement of the exhaust efficiency of the panel, and the long side exhaust path width Wl is made larger than the short side exhaust path width Ws. By sufficiently securing it, the exhaust conductance of the PDP can be improved and the exhaust efficiency can be improved. With such a structure, no special method or structure is required, and the exhaust conductance can be improved, the exhaust efficiency can be improved, and the exhaust time can be shortened only by the conventional manufacturing process. Furthermore,
Since the short side exhaust path width Ws does not affect the exhaust conductance so much, it can be reduced or eliminated within a manufacturing allowable range, and a portion other than the display area can be reduced. In addition, a PDP having a lattice-shaped partition with steps
However, by expanding the long side exhaust path width Wl, it is possible to obtain the exhaust conductance similar to that of the PDP of the stripe-shaped partition wall.

Although the exhaust holes 14 have been described so far in the case where they are provided at the corners of the PDP, the above results are not affected by the position of the exhaust holes. Further, the structure of the partition is not limited to the stripe shape or the grid shape, and the same result can be obtained as long as the partition structure has an exhaust path parallel to at least the short side.

(Embodiment 2) FIG. 9 shows a wide-screen VGA (852 ×) having a diagonal screen size of 32 inches, 37 inches, 46 inches, 50 inches, and 60 inches.
It is the result of measuring the in-plane average ultimate panel pressure when the long side exhaust path width was changed from 0 mm to 20 mm for an actual PDP for a PDP having 480 pixels) and a striped partition wall. Here, the exhaust temperature and the exhaust time are both constant, and the short side exhaust path width Ws is 3 mm. The results show that the long side exhaust path width Wl and the in-plane average ultimate pressure in the panel are inversely proportional regardless of the screen diagonal inch size. In addition, the average pressure in the panel that reaches the in-plane average is about 5 Pa in order to ensure long-term reliability of the PDP.
The following is desirable. Therefore, when the long side exhaust path width Wl required for each screen diagonal inch size is obtained from FIG. 9, the long side exhaust path width Wl is 32 inches and the long side exhaust path width Wl is about 3 mm, 37.
The long side exhaust path width Wl is about 5 mm in inches, the long side exhaust path width Wl is about 7 mm in 46 inches, the long side exhaust path width Wl is about 8 mm in 50 inches, and the long side exhaust path width is 60 inches.
Wl is about 12 mm. FIG. 10 is obtained by plotting this relationship as the diagonal screen size on the horizontal axis (inch unit) and the exhaust path width Wl on the long side of the vertical axis Wl (unit mm). This result shows that the long side exhaust path width Wl is proportional to the screen diagonal inch size. If this relationship is obtained by the least square method, the long side exhaust path width Wl (unit mm) is (0.31 × The screen diagonal inch size (unit inch) −6.76). Therefore, the long side exhaust path width Wl (unit: mm) is (0 mm) in order to obtain the in-plane average ultimate panel pressure required to secure long-term reliability of the PDP within a predetermined exhaust temperature and exhaust time. ．
31 x screen diagonal inch size (unit inch) -6.7
6) It is necessary that the size is not less than that.

As described in the first embodiment, the short side exhaust path width Ws has little influence on the exhaust conductance. Therefore, when the short side exhaust path width Ws is set to a size other than 3 mm or 0 mm. May be As a result, it is possible to reduce the area other than the display area by reducing the short side exhaust path width Ws unless there is a manufacturing limitation.

Here, setting the width Ws of the short side exhaust path to 0 mm means that there is no exhaust path in the internal space from the sealing material on the short side to the end of the partition wall on the short side. That is, there is an exhaust path in the internal space from the sealing material on the long side portion side to the end of the partition wall on the long side portion side. As a result, it becomes possible to manufacture a PDP in which the portion other than the display area is the smallest.

(Third Embodiment) As described in the first embodiment, the exhaust conductance is the long side exhaust path width Wl, that is, from the long side partition wall end of the PDP to the long side panel sealing part. Affected by the average distance of. Therefore, in order to suppress variations in exhaust conductance for each product,
It is necessary to accurately control the dimension of the long side exhaust path width Wl. However, conventionally, the dimension of the long side partition wall end of the PDP can be accurately controlled because it is formed by the sandblast method or the like, but the dimension of the long side panel sealing section is as shown in FIG. As shown in (b), the glass frit is applied to the position of the panel sealing portion 3 on the rear substrate 1, and the glass frit is melted by bonding with the front substrate to bond both substrates. It is crushed by both substrates and spreads inside and outside the panel, and it is impossible to control with high precision. Therefore, in the structure of the conventional PDP, since the dimension of the long side panel sealing portion varies, the exhaust conductance of each product also varies, and as a result, a product with insufficient exhaust and low reliability may be manufactured. there were. In addition, a method of prolonging the evacuation time may be considered in order not to manufacture a product with insufficient evacuation, but if this is done, the takt time of the evacuation process will be extended and the production efficiency of the product will be reduced.

Therefore, as shown in FIG. 11, protective walls 13 having the same height as the partition walls 4 are provided on the four sides inside the panel sealing portion 3. As a result, it is possible to prevent the glass frit melted when the two substrates are sealed from spreading inside the panel, and by providing the protective wall 13 at a predetermined distance from the long side partition wall end of the PDP. The dimension of the long side exhaust path width Wl can be controlled accurately. As a result, there is no variation in exhaust conductance between products, and it is possible to manufacture a highly exhausted and highly reliable product.

Next, the step of forming the protective wall 13 is shown in FIG. First, as shown in FIG. 12A, the partition material 21 is laminated and printed on the back substrate 1 on which the electrodes and the dielectric film are formed. Next, as shown in FIG. 12B, a dry film 22 is laminated and printed on the barrier rib material 21 which is laminated and printed.
After that, as shown in FIG. 12C, a dry film pattern 23 is formed on the portion where the partition wall and the protective wall are to be formed by exposure and development using a photomask. Next, FIG.
As shown in (d), the dry film pattern 23 is used as a mask, and the portions where the partition wall and the protective wall are not formed are shaved off by a sandblast method. Thereafter, as shown in FIG. 12E, the dry film pattern 23 formed on the partition wall and the protective wall is peeled off. Finally, as shown in FIG. 12F, a partition and a protective wall can be formed through a firing process. When formed by the method as described above, the partition wall and the protective wall can be formed at the same time, and there is an advantage that the manufacturing cost can be suppressed without the need to add another manufacturing process for providing the protective wall. The partition structure is not limited to the stripe shape or the grid shape, and may be any partition structure having an exhaust path parallel to at least the short side. In addition, the forming process of simultaneously forming the partition wall and the protective wall has been described from the viewpoint of manufacturing cost, but the material may not be formed at the same time as the partition wall as long as it is a material at least higher than the softening point of the sealing material.

As a modification of the third embodiment, as described in the first embodiment, the exhaust conductance is affected by the long side exhaust path width Wl, but is not affected by the short side exhaust path width Ws. . Therefore, controlling the dimension of the long side exhaust path width Wl is effective in suppressing variations in the exhaust conductance. Therefore, it is not necessary to provide the protection wall 13 as shown in FIG. 11 on all four sides along the inside of the panel sealing portion 3, and the protection wall 13 can be provided only along the inside of the panel sealing portion 3 on the long side. It is possible to suppress the variation of the exhaust conductance just by providing it. Further, by providing the protective wall only on the long side, it is possible to reduce the area other than the display area by the protective wall on the short side.

[0042]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the structure in which the long side exhaust path width Wl is conventionally less than the short side exhaust path width Ws is P
By making the DP a PDP having a structure in which the long side exhaust path width Wl is larger than the short side exhaust path width Ws, the long side exhaust path width Wl is sufficiently secured to improve the exhaust conductance of the panel and improve the exhaust efficiency. Has improved. As a result, a highly reliable PDP with sufficient exhaust can be manufactured.

According to the second aspect of the invention, the relationship between the long side exhaust path width Wl and the diagonal screen size of the screen is clarified for the PDP having the wide VGA display pixel and the stripe-shaped partition wall. By calculating the side exhaust path width Wl, there is an effect that the PDP can always ensure a sufficient exhaust conductance in the exhaust process.

According to the invention of claim 3, in order to improve the exhaust conductance of the panel and improve the exhaust efficiency,
Since it suffices to sufficiently secure the long-side exhaust path width Wl, the short-side exhaust path width Ws can be eliminated, and there is an effect that a portion other than the display area can be made smaller.

According to the fourth aspect of the present invention, by providing the protective wall, the dimension of the long side exhaust path width Wl can be controlled with high accuracy, so that there is no variation in the exhaust conductance between products, and the exhaust gas is exhausted. Sufficient and reliable P
There is an effect that DP can be manufactured.

According to the fifth aspect of the present invention, the dimension of the long side exhaust path width Wl can be accurately controlled even by providing the protective wall only on the long side, so that the variation of the exhaust conductance between products can be improved. Is eliminated, and there is an effect that a highly reliable PDP with sufficient exhaust can be manufactured. Further, there is an effect that it is possible to reduce the size of the portion other than the display area by the protection wall on the short side.

According to the invention of claim 6, since the protective wall is formed at the same time as the partition wall formed in the panel, there is an effect that the manufacturing cost can be suppressed without adding another manufacturing process.

[Brief description of drawings]

FIG. 1 is a schematic diagram schematically showing a plasma display panel according to a first embodiment of the present invention.

FIG. 2 is a conceptual diagram modeling a gas flow in the plasma display panel according to the first embodiment of the present invention.

FIG. 3 is a diagram showing a relationship between a short side exhaust path width and a long side exhaust path width and an exhaust conductance of the plasma display panel according to the first embodiment of the present invention.

FIG. 4 is a conceptual diagram modeling the exhaust in the plasma display panel according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a panel pressure distribution in the case where the plasma display panel according to the first embodiment of the present invention has stripe-shaped partition walls.

FIG. 6 is a diagram showing a panel pressure distribution in the case where the plasma display panel according to the first embodiment of the present invention has stripe-shaped partition walls.

FIG. 7 is a diagram showing a pressure distribution in a panel in the case where the plasma display panel according to the first embodiment of the present invention has stepped grid-shaped partition walls.

FIG. 8 is a diagram showing a panel pressure distribution when the plasma display panel according to the first embodiment of the present invention has stepped grid-shaped partition walls.

FIG. 9 is a diagram showing a relationship between a long-side exhaust path width and an in-plane average ultimate panel pressure of the plasma display panel according to the second embodiment of the present invention.

FIG. 10 is a diagram showing a relationship between a long side exhaust path width and a screen diagonal inch size of the plasma display panel according to the second embodiment of the present invention.

FIG. 11 is a perspective view showing a structure on a rear substrate of a plasma display panel according to a third embodiment of the present invention.

FIG. 12 is a diagram showing a step of forming partition walls and protective walls on the rear substrate of the plasma display panel according to the third embodiment of the present invention.

FIG. 13 is a perspective view showing a structure of a conventional plasma display panel having stripe-shaped barrier ribs.

FIG. 14 is a perspective view showing a structure of a conventional plasma display panel having a grid-shaped partition.

FIG. 15 is a perspective view showing the structure of a conventional plasma display panel having a stepped grid partition.

FIG. 16 is a perspective view showing a structure of a conventional plasma display panel having a groove on a substrate.

[Explanation of symbols]

1 back substrate, 2 front substrate, 3 panel sealing part, 4
Striped barrier ribs, 5 phosphors, 6 address electrodes, 7
Dielectric layer for back substrate, 8 Scanning / sustaining electrode, 9 Dielectric for front substrate, 10 Protective film, 11 Lattice partition, 12
Lattice bulkhead with steps, 13 protective walls, 14 exhaust holes, 1
5 Exhaust groove, 21 Partition material, 22 Dry film, 2
3 Dry film pattern.

Continued front page    F-term (reference) 5C027 AA10                 5C040 FA01 FA04 GA03 GB03 GF14                       GF19 JA15 JA17 LA10 MA23                       MA24

Claims (6)

[Claims] 1. A seal for sealing the periphery of the pair of substrates so as to have a pair of substrates arranged opposite to each other and having a long side portion and a short side portion, and an internal space between the pair of substrates. A plasma display panel comprising a material and a partition wall that partitions the internal space provided in the pair of substrates and has an end formed inside the sealing material, wherein the long side sealing material To the edge of the partition wall on the long side portion side is larger than the second average distance from the sealing material on the short side portion side to the edge of the partition wall on the short side portion side. The feature is a plasma display panel. 2. The plasma display panel according to claim 1, wherein the first average distance is (0.31 × screen diagonal inch size−6.76) millimeters or more. 3. A pair of substrates facing each other and having a long side portion and a short side portion, and a sealing for sealing the periphery of the pair of substrates so as to have an internal space between the pair of substrates. And a partition wall that partitions the internal space provided in the pair of substrates and has an end formed inside a sealing material, wherein the sealing material on the short side portion side To the end of the partition wall on the side of the short side does not have an exhaust path, and the interior from the sealing material on the side of the long side to the end of the partition on the side of the long side. A plasma display panel characterized in that an exhaust path exists in the space. 4. The plasma display panel according to claim 1, further comprising a protective wall having a height equal to or lower than that of the partition wall inside the sealing material. 5. A protective wall having a height equal to or lower than that of the partition wall is further provided only inside the long side along the sealing material.
The plasma display panel according to claim 1. 6. The method of manufacturing a plasma display panel according to claim 4 or 5, wherein the protective wall is formed at the same time when the partition wall is formed. Method.