JP2003317634A - Plasma display panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display panel performing a quiet driving operation by suppressing vibration and noise generated by the plasma display panel. <P>SOLUTION: A first enclosed space 21 and a second enclosed space 22 are formed from two sheets of substrates 110, 120 and a sealing material 10. An inside pressure of the second enclosed space 22 is set lower than an outside atmospheric pressure and lower than an inside pressure of the first enclosed space 21, so that the second enclosed space 22 exists in a state of surrounding a display area 9 compressed by the atmospheric pressure as an outside pressure, and force is generated in a direction of adhering the substrates 110, 120 from outside an end part 124 of a partition wall 124 doubly fixed to be a fulcrum, and with the outside of the end part of the partition wall 124 as a fixing end, the substrates 110, 120 become hard to deform to suppress the vibration. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display panel that forms a sealed space different from a discharge space to suppress sound generated during driving.

[0002]

2. Description of the Related Art A conventional plasma display panel will be described with reference to FIG. 8 or FIG. FIG. 8 is an exploded perspective view schematically showing the structure of one pixel in a plasma display panel (hereinafter referred to as PDP). The first substrate 110 arranged on the front side is a main electrode for display (sustain discharge electrode) on a flat glass 112 which is a base material of the substrate.
111 are provided substantially in parallel, and a large number of these main electrodes 111 are arranged on the entire flat glass 112. Further, a transparent dielectric 113 that covers these main electrodes 111 and a protective film 114 are provided on the surface thereof. Normally, the thickness of the first substrate 110 on the front side is about 2 to 3 mm, and the transparent dielectric 1
The thickness of 13 is several tens of μm, and the thickness of the protective film 114 is about 1 μm.
Is.

On the other hand, the second substrate 12 disposed on the back side
0 is provided in a direction in which the address electrode 121 intersects with the main electrode 111 on the flat glass 122 serving as a base material of the substrate,
A dielectric 123 covers these address electrodes 121. Partition walls 124 for separating discharge are provided between the address electrodes 121.
The upper surface of the dielectric 123 sandwiched between the
On the side of the red, green, blue phosphor 125R, 125G, 1
25B is provided. In addition, in FIG.
Although only one set of R, 125G, and 125B is shown, a large number of R, 125G, and 125B are actually provided according to the number of pixels of the PDP. Usually, the second substrate 120 has a thickness of about 2 to 3 mm, the transparent dielectric 123 has a thickness of several tens of μm, and the partition wall 124 has a thickness of 100 to 20.
It is 0 μm.

A plan view of the entire PDP is shown in FIG. The first substrate 110 provided on the front side and the second substrate 120 provided on the back side are the main electrode 111 and the address electrode 12.
1 and 1 are combined with each other at a predetermined interval in a direction intersecting with each other, and the periphery thereof is sealed by a sealing material 126.

[0005]

It has been found that in some conventional plasma display devices using a PDP, an abnormal sound (hereinafter referred to as an abnormal sound) is emitted from the PDP. The generation of such an abnormal sound has a problem that some users who use the plasma display device feel uncomfortable. Therefore, as a result of first analyzing how the abnormal noise occurs, the following points were clarified. The contents will be described with reference to FIG. FIG. 10 is a schematic cross-sectional view showing the cause of the vibration sound generated by the plasma display device.

In the conventional PDP, as shown in FIG. 10, the height of the end portion P of the partition wall 124 may be higher than a predetermined partition wall height due to manufacturing variations during partition wall formation, variations in heat shrinkage during firing, and the like. there were. In this way, when the partition wall 124 is raised at the end P of the partition wall 124, the first substrate 110 disposed on the front surface side has the raised end portion P of the partition wall 124.
With the fulcrum as the fulcrum, the beam is lifted to form a beam having a length L1.

In this state, the main electrode 1 on the first substrate 110
A drive voltage for sustain discharge is applied to 11, and a drive voltage of a normal ground level is applied to the address electrode 121 on the second substrate 120 during the sustain discharge period. In a state where such a driving voltage is applied, an arrow F in FIG. 10 is provided between the first substrate 110 and the second substrate 120.
The attractive force as shown in (4) works, and the magnitude of the attractive force fluctuates temporally (periodically). It is presumed that the attractive force that fluctuates temporally (periodically) in this way will give an exciting force between the two substrates between the beams having the length L1.

The substrate (that is, the first glass substrate 110 or the second glass substrate 120) mentioned here includes members such as electrodes, dielectric layers, and partition walls in addition to a single glass substrate. The whole of each substrate may be shown (hereinafter the same). As a result, this PDP resonates at a resonance frequency determined by the density of the first glass substrate 110, the length L1 of the beam, and the like, and generates a vibrating sound (abnormal noise) corresponding to the resonance frequency. The generation of this abnormal noise is indicated by an asterisk S in FIG. On the other hand, resonance may occur in the range of the beam having the length L2 shown in FIG. 10 (the range in which one end is lifted by the sealing material 126), and at this time, vibration noise (abnormal noise) corresponding to this resonance is generated. Alternatively, it is assumed that the resonance causes the first substrate 110 to vibrate and contact the end portion P of the partition wall 124 to generate a collision noise (abnormal noise).

The present invention has been made to solve the above problems, and an object of the present invention is to provide a plasma display panel that suppresses vibrations and sounds generated from the plasma display panel and performs a quiet driving operation.

[0010]

A plasma display panel according to the present invention has two substrates and a sealing material that is in close contact with the two substrates to form a sealed space. An area including a display area partitioned by a plurality of partition walls is sealed with a first sealing material to form a first sealed space, and the outside of the first sealing material forming the first sealed space. A part or all of the periphery is sealed with a second sealing material to form a second sealed space, the internal pressure of the second sealed space is made lower than the external atmospheric pressure, and the first sealed space is formed. It is lower than the internal pressure of the closed space. As described above, in the present invention, the first closed space and the second closed space are formed from the two substrates and the sealing material, and the second closed space is formed.
The internal pressure of the closed space is lower than the external atmospheric pressure, and the internal pressure of the second closed space is lower than the internal pressure of the first closed space. Pressed by a certain atmospheric pressure, the second closed space exists so as to surround the display area, and is fixed from the outside of the partition wall end that is a fulcrum that is double fixed without being related to the first closed space. A force is generated in the direction in which the partition walls are brought into close contact with each other, and the outside of the partition wall end serves as a fixed end, which makes it difficult for the substrate to deform and suppress vibration. In particular, it is possible to independently set the internal pressure of the second closed space to an extremely low pressure while securing a sufficient internal pressure required for discharge in the first closed space including the display area.

In the plasma display panel according to the present invention, a vent hole for filling gas (hereinafter, referred to as discharge gas) for performing exhaust and plasma discharge to the first closed space is provided as needed. It is formed in a region outside the plurality of partition walls. As described above, in the present invention, since the vent hole is provided in the outer region of the partition wall, the first sealing material can be formed in the vicinity of the partition wall end portion, so that in the second sealed space in the partition wall extending direction. The external pressure from the atmospheric pressure is not disturbed, and a sufficient force is generated in the direction of bringing the substrate into close contact with the outer edge of the partition wall end portion, which serves as a fulcrum when the vibration occurs, and the vibration can be suppressed.

Further, in the plasma display panel according to the present invention, the second sealing material is connected to the first sealing material at least in the vicinity of the ventilation hole, if necessary. As described above, in the present invention, the second seal material is formed continuously with the first seal material, the first seal material and the two substrates form the first sealed space, and the first seal material is formed. The second sealing material, the second sealing material, and the two substrates form a second closed space, and the second sealed space is higher than the second atmospheric pressure.
Since the internal pressure of the closed space is low, the second closed space is pressed by the atmospheric pressure, which is the external pressure, and the second closed space exists so as to surround the display area. A force is generated in the direction of bringing the substrate into close contact with the outer edge of the portion to suppress vibration, and since the second sealing material is formed continuously with the first sealing material, it is simple and quick. The first sealing material and the second sealing material can be formed.

Further, in the plasma display panel according to the present invention, the first hermetically sealed space and the second hermetically sealed space are filled with a gas having a different composition for each space, if necessary. As described above, in the present invention, since the different gas is filled in each space, it is preferable to fill the second closed space with the same gas as the discharge gas filled in the first closed space. By enclosing a stable and inexpensive gas in the closed space, it is possible to safely and stably operate for a long period of time, and in addition, it is possible to reduce the manufacturing cost.

Further, in the plasma display panel according to the present invention, the second hermetically sealed space is composed of a plurality of spaces as required. As described above, in the present invention, since the plurality of spaces are gathered to form the second closed space, the internal pressure of one space can be different from the internal pressure of the other space, and the partition wall end portion which is extremely high. When a portion of the high partition wall ends, by lowering the internal pressure of the space forming the second sealed space in the vicinity of the high partition wall end portion, in the direction in which the substrate is adhered only around the high partition wall end portion. A remarkably large force is generated, that is, a force in an appropriate contact direction can be generated according to the degree of swelling of the partition wall end portion, and vibration can be accurately suppressed.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION (First Embodiment of the Invention) A plasma display panel according to a first embodiment of the present invention will be described with reference to FIG. 1 or FIG. 1 is a plan view of the plasma display panel according to the present embodiment, and FIG. 2 is a cross-sectional view of the plasma display panel of FIG. In each of the drawings, the plasma display panel (hereinafter referred to as PDP) according to the present embodiment is assumed to be a general three-electrode discharge PDP, and the first substrate 110 described in the conventional PDP and the conventional PDP are used. The second substrate 120 described above is provided, and the first substrate 110 and the second substrate 120 are in close contact with each other via the sealing material 10 and are bonded together.

The sealing material 10 includes a first sealing material 11 and a first sealing material 11 which are arranged so as to surround the display area 9 and surround the display area 9.
Second sealing material 12 disposed so as to surround the sealing material 11 of the first substrate 110 and the second substrate 120 for the purpose of bonding the first substrate 110 and the second substrate 120 together.
A first closed space 21 including a discharge space is formed from the second substrate 120 and the first sealing material 11, and the first substrate 1
The second sealed space 22 that does not include the discharge space is formed from the 10, the second substrate 120, the first sealing material 11, and the second sealing material 12. In addition, the first ventilation hole 31 that connects the first closed space 21 and the outside and the second ventilation hole 32 that connects the second closed space 22 and the outside are provided with the partition wall 12.
They are provided outside the display area 9 in four array directions. Gas is enclosed in the first closed space 21 and the second closed space 22 and exhausted from the first ventilation hole 31 and the second ventilation hole 32, respectively.

After the first substrate 110 and the second substrate 120 are attached to each other via the sealing material 10, the first closed space 21 and the first closed space 21 are respectively passed through the first ventilation hole 31 and the second ventilation hole 32. The second closed space 22 is evacuated to a vacuum state or a state close to a vacuum. After exhausting, the discharge gas is filled into the first closed space 21 including the discharge space through the first ventilation hole 31 so as to have a pressure P1. (For example, the mixed gas of neon and xenon is set to 500 torr [6
Enclose so that the pressure becomes 6.5 KPa. )

When the pressure P1 is low, problems such as a decrease in luminous efficiency and a short life of the phosphor occur, and when the pressure P1 is high, the pressure difference with the atmosphere becomes small, so that it is suitable for use in a place where the atmospheric pressure is low, such as in highlands. The problem arises. Further, the discharge gas of the PDP is mainly composed of Ne or He, and a gas in which 3% to 10% of Xe is mixed with this Ne or He is mainly used. X
If the e ratio exceeds the optimum range, the discharge voltage will increase and Xe
If the ratio is below the optimum range, there is a problem that the luminance and the luminous efficiency are lowered, so about 3% to 10% is preferable. Therefore, the discharge gas in the PDP has a fill gas pressure of 500 ± 50 torr, Ne 90 to 97%, and Xe 3 to
It is composed of a mixed gas with a composition ratio of 10%. Similarly, the discharge gas is filled through the second ventilation hole 32 into the second closed space 22 not including the discharge space so that the pressure P2 is lower than the pressure P1. (For example, a mixed gas of neon and xenon is charged so as to have a pressure lower than 500 torr.) When the atmospheric pressure is P3, P3>P1> P2 holds.

First closed space 21 and second closed space 2
2 also receives the same atmospheric pressure because they are in the same environment. However, since the internal pressures of the first closed space 21 and the second closed space 22 are P1 and P2, respectively, which are different from each other, the first closed space 21 and the second closed space 22 are relatively closed in the second closed space 21. The space 22 has a weaker force against the outside due to the internal pressure, and is more affected by the atmospheric pressure which is the external pressure. Therefore, the second closed space 22 is pressed from the outside to the inside by the atmospheric pressure, and the second closed space 22 is formed so as to surround the first closed space 21.
The end of the partition wall 124 in the extending direction is strongly fixed.

According to the PDP of this embodiment, one sealing space including the discharge space is usually formed by the sealing material, while the first sealing material 11 and the second sealing material 1 are formed.
2 further forms a second closed space 22 not including one discharge space, and a first closed space 2 in which a discharge gas is sealed.
Since the discharge gas is sealed in the second closed space 22 so that the pressure of the gas is lower than the pressure of the first gas, the first closed space 21 and the second closed space 22 are relatively second. Since the closed space 22 has a weaker force against the outside due to the internal pressure and is more affected by the atmospheric pressure which is the external pressure, and the second closed space 22 is formed around the display region 9, the display region The periphery of 9 is fixed by the atmospheric pressure, and the end portion of the partition wall 124 is also fixed by this, and when the plasma display device is driven, it is possible to perform quiet driving without generating vibration.

(Other Embodiments) In the PDP according to the first embodiment, the discharge gas is enclosed in the second hermetically sealed space 22 through the second ventilation hole 32 to seal the discharge gas. Since 9 is not included, the discharge amount can be adjusted to the internal pressure P2 without enclosing the discharge gas. Here, what is sealed in the second closed space 22 may be a gas other than the above-mentioned discharge gas as long as it can achieve the internal pressure P2, and by using a more stable and inexpensive gas, it is possible to safely It can operate stably for a long period of time, and in addition, it can reduce the manufacturing cost. The advantage of sealing the discharge gas in the second closed space 22 is as follows.
When the first closed space 21 does not maintain the airtightness and communicates with the second closed space 22, it is possible to suppress the dilution of the concentration of the discharge gas. Further, the internal pressure P2 may be in a state close to a vacuum, and in such a state, the substrate around the display region 9 can be brought into a state in which the atmospheric pressure is pressed by a larger force.

In the PDP according to the first embodiment, the first sealing material 11 and the second sealing material 1 are used to form the first closed space 21 and the second closed space 22.
2 is provided, but as shown in FIG.
It is also possible to have one configuration in which the first and second sealing materials 12 are connected, and productivity can be improved. Also, the first
In the PDP according to the embodiment, the first closed space 21
And the first sealing material 1 to form the second closed space 22
Although the first and second sealing materials 12 are provided, as shown in FIG. 4, the outer shape of the first sealing material 11 can be rectangular, and the productivity can be improved.

In the PDP according to the first embodiment, the first sealing material 11 and the second sealing material 1 are used to form the first closed space 21 and the second closed space 22.
2 is arranged, but as shown in FIG. 5 or FIG. 6, the first sealing material 11 and the second sealing material 12 are connected to each other to form one structure, and the outer shape of the first sealing material 11 is rectangular. It is also possible to increase productivity. Also, the first
In the PDP according to the embodiment described above, the second closed space 22 is configured by one space, but as shown in FIG. 7, it may be configured by a plurality of spaces, for example, the partition wall 124 around the point α. When the swell of the end is significantly larger than the swell of the other partition 124, only the second sealed space 22 ′ adjacent to the point α is further defined to reduce the gas pressure to the other second sealed space. By setting it to be lower than 22, a remarkably large force is generated in the direction of bringing the substrate into close contact only with the point α, and the vibration can be surely suppressed.

[0024]

As described above, in the present invention, the above 2
A first closed space and a second closed space are formed from the substrate and the sealing material, and the internal pressure of the second closed space is made lower than the external atmospheric pressure, and the internal pressure of the second closed space is reduced. Since the internal pressure of the first closed space is lower than the internal pressure of the first closed space, the second closed space is pressed by the external atmospheric pressure, and the second closed space exists so as to surround the display area. A force is generated in the direction of bringing the substrate into close contact with the outside of the partition wall end that serves as a fulcrum by being doubly fixed without being related to the closed space of 1, and the outside of this partition wall end becomes the fixed end, and the substrate is deformed. There is an effect that it becomes difficult to suppress vibration. In particular, it is possible to independently set the internal pressure of the second closed space to an extremely low pressure while securing a sufficient internal pressure required for discharge in the first closed space including the display area.

Further, in the present invention, since the ventilation hole is provided in the region outside the partition wall, the first sealing material can be formed in the vicinity of the partition wall end, so that the partition wall is extended in the second closed space. The effect that the external pressure from the atmospheric pressure is not hindered in the exit direction, and a sufficient force is generated in the direction in which the substrate is brought into close contact with the outer edge of the partition wall end, which is a fulcrum when vibration occurs, and vibration can be suppressed Have.

Further, in the present invention, the second sealing material is formed continuously with the first sealing material, the first sealing material and the two substrates form a first closed space, and A second sealed space is formed by the first sealing material, the second sealing material, and the two substrates, and the second sealed space is higher than the second atmospheric pressure.
Since the internal pressure of the closed space is low, the second closed space is pressed by the external atmospheric pressure, and the second closed space exists so as to surround the display area. A force is generated in the direction of bringing the substrate into close contact with the outer edge of the portion to suppress vibration, and since the second sealing material is formed continuously with the first sealing material, it is simple and quick. There is an effect that the first sealing material and the second sealing material can be formed.

Further, in the present invention, since the different gas is filled in each space, the same gas as the discharge gas filled in the first closed space is filled in the second closed space rather than the same gas. By enclosing a stable and inexpensive gas in the second closed space, it is possible to safely and stably operate for a long period of time, and in addition, it is possible to reduce the manufacturing cost.

Further, in the present invention, since a plurality of spaces are gathered to form the second closed space, the internal pressure of one space can be made different from the internal pressure of the other space, and remarkably. When the high partition wall end portion is partially generated, by lowering the internal pressure of the space forming the second sealed space in the vicinity of the high partition wall end portion, the substrate is provided only around the high partition wall end portion. A remarkably large force is generated in the close contact direction, that is, an appropriate force in the close contact direction can be generated according to the degree of swelling of the partition wall end, and vibration can be accurately suppressed.

[Brief description of drawings]

FIG. 1 is a plan view of a plasma display panel according to a first embodiment of the present invention.

2 is a cross-sectional view of the plasma display panel of FIG.

FIG. 3 is a plan view of a plasma display panel according to another exemplary embodiment of the present invention.

FIG. 4 is a plan view of a plasma display panel according to another exemplary embodiment of the present invention.

FIG. 5 is a plan view of a plasma display panel according to another embodiment of the present invention.

FIG. 6 is a plan view of a plasma display panel according to another embodiment of the present invention.

FIG. 7 is a plan view of a plasma display panel according to another exemplary embodiment of the present invention.

FIG. 8 is a partial perspective view of a conventional plasma display panel.

FIG. 9 is a plan view showing a structure of a conventional plasma display panel.

FIG. 10 is a conceptual diagram of vibration generation in a conventional plasma display device.

[Explanation of symbols]

9 Display area 10 Seal material 11 First seal material 12 Second sealing material 21 First closed space 22 Second closed space 31 First vent 32 Second vent 100 plasma display panel 110 First substrate 111 Main electrode 111a transparent electrode 111b Bus electrode 112 Flat glass 113 Dielectric layer 114 protective layer 120 second substrate 121 address electrode 122 Flat glass 123 Dielectric layer 124 partition 125, 125R, 125G, 125B phosphor

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masayuki Shibata             3-2-1 Sakado, Takatsu-ku, Kawasaki City, Kanagawa Prefecture               Fujitsu Hitachi Plasma Display Stock Association             In-house (72) Inventor Takashi Sasaki             3-2-1 Sakado, Takatsu-ku, Kawasaki City, Kanagawa Prefecture               Fujitsu Hitachi Plasma Display Stock Association             In-house F-term (reference) 5C040 HA01 HA04 MA30

Claims (5)

[Claims] 1. An area including two substrates and a sealing material which is in close contact with the two substrates to form a closed space, and which includes a display region partitioned by a plurality of partition walls between the two substrates. Is sealed with a first sealing material to form a first sealed space, and a part or the entire area of the outer periphery of the first sealing material forming the first sealed space is sealed with the second sealing material. A second closed space is formed by sealing with a material, and the internal pressure of the second closed space is lower than the external atmospheric pressure and lower than the internal pressure of the first closed space. Plasma display panel. 2. The plasma display panel according to claim 1, wherein ventilation holes for exhausting and discharging discharge gas into the first closed space are formed in a region outside the plurality of arranged barrier ribs. Plasma display panel characterized by. 3. The plasma display panel according to claim 2, wherein the second sealing material is connected to the first sealing material at least in the vicinity of the ventilation hole. 4. The plasma display panel according to claim 1, wherein each of the first closed space and the second closed space is filled with a gas having a different composition. Characteristic plasma display panel. 5. The plasma display panel according to claim 1, wherein the second closed space is composed of a plurality of spaces.