JP2002008550A - Display panel and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display panel, as well as PDP, enabled to reduce a noise caused by crushing sound generated by the vibration of a front panel and a back panel during actual driving. SOLUTION: For the display panel, a protrusion part 21 is formed at the inner surface of the first panel opposing to the second panel, and the first panel and the second panel are bonded by bonding agent at a portion 23 where the protrusion and a barrier rib 18 is crossed. By the above, the noise (noise level), caused by crushing sound generated by the vibration of the front panel and the back panel during actual driving, is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display panel and a method of manufacturing the same, and more particularly to a panel structure effective for reducing noise.

[0002]

2. Description of the Related Art PD which is one of gas discharge panels at present.
P (plasma display panel) is expected as a large display capable of realizing a size of 40 '' or more. PDPs are self-luminous and have excellent characteristics such as high-speed response and a wide viewing angle. In addition, it is said that it is suitable for large displays because the manufacturing process is relatively simple.

FIG. 1 shows an AC type PDP. This PDP
The front panel 100 and the rear panel 200 are arranged to face each other, and both panels are sealed with a sealing material (not shown) interposed at the outer periphery of the facing surface. The sealing is performed by softening the sealing material by heating the outer peripheral portions of the oppositely arranged panel members while sandwiching the outer peripheral portions thereof with clips or the like, and then cooling and hardening the sealing material.

[0004]

However, in the case of sealing in such a manner, the central portion of the panel may slightly swell up and down as shown in FIG. In the panel having such a shape, in actual driving, a portion where two laminated panel members are in contact with each other, in particular, a partition wall 202 formed on the back panel and forming a groove for forming the phosphor layer 201.
There is a case where a subtle vibration is generated at a boundary portion 203 where the device and the front panel 100 are in contact with each other, and the vibration generates a collision sound and noise. When the noise level due to the above noise increases, a great deal of discomfort is given to humans. For example,
A large display such as a PDP may be placed in a relatively quiet place such as a guide display in a hospital or the like, and noise may be very noticeable. For this reason, a panel that generates noise is not realized as a product.

A display panel employing a time-division in-frame image display method such as a PDP as a driving method has four operations: an initialization operation, a writing operation, a light emission maintaining operation, and an erasing operation.
One frame image is displayed by repeating the two operations. The actual driving means that the panel is placed in a state where such an operation is repeated. Also,
Even when the panel is used normally, the generation of noise is not recognized even when the panel is used at a high altitude of several thousand meters. Although this is a panel originally having a slight swelling, it is considered that the front panel and the back panel are pressed from the outside of the panel by the pressure difference between the gas filling pressure inside the panel and the atmospheric pressure and are not swelled. When such a panel is used at a high altitude, the difference between the internal pressure and the atmospheric pressure is reduced, and the force of pressing the front panel and the rear panel from the outside of the panel is reduced. Can be

It is an object of the present invention to provide a display panel such as a PDP capable of reducing noise caused by a collision sound caused by vibration of a front panel and a rear panel during actual driving. Aim.

[0007]

In order to achieve the above-mentioned object, the present invention provides a method in which a first panel having a first electrode and a second panel having a second electrode face each other. A display panel for applying a voltage to the first electrode and the second electrode to display an image by an in-frame time-division image display method, wherein the first panel and the second panel are vibrated during actual driving. And a noise level at a frequency of 20 Hz to 20 kHz generated by contact with the sound source is not more than 30 dB.

The present invention focuses on a frequency of 20 Hz to 20 kHz, which is a frequency band of a sound (audible sound) that can be sensed by a human, and sets the noise level to 3 within this frequency range.
It is significant that the value is defined to be 0 dB or less.
The noise level here is 10 times the common logarithm of a value obtained by dividing the square of the effective value of the sound pressure weighted by the A characteristic by the square of the reference sound pressure (20 μPa), that is, the A characteristic frequency weighted sound pressure Level (Aweated sound)
pressure level) (see JIS (Japanese Industrial Standards) Z8731). In other words, sound in a frequency band that does not originally remain as noise for humans is not a problem from the beginning, but it is considered that the noise level is reduced by focusing on a frequency band that is perceived as noise. It is considered that noise occurs remarkably during an initialization operation that is frequently repeated within one frame with a relatively large voltage. That is, in a display panel adopting the in-frame time-division image display method, generally, it is extremely significant to reduce the noise level.

[0009] Japanese Industrial Standards (JIS) C1
An apparatus conforming to 505-1988 and the International Electrotechnical Commission (IEC) standards IEC60651 and IEC60804 is applied. For example, NL-14 1/1, 1/3 octave filter unit NX-
05 (RION co., LTD PRECISION INTEGRATING SOUN
D LEVEL METER NL-14 1/1, 1/3 OCTAVE FILTER mode
l NX-05). At the time of measurement, the microphone is placed at a distance of 50 mm perpendicular to the substrate glass surface of the panel display surface (installed so that the incident angle becomes 0 °), and the measurement is performed.

First, the noise level of the background noise when the panel is not lit is measured. It is desirable to select several measurement points on the panel display surface. The measurement is performed while changing the center frequency of the filter from 20 Hz to 20 kHz. Next, in a state where a single color is fixedly displayed (for example, white) on the entire display surface of the panel, the noise level is measured in the same manner at the measurement point. The value obtained by subtracting the non-lighting noise level from the lighting noise level is the noise level of the noise generated during the actual driving of the panel.

Further, in order to achieve the above object, the present invention provides a method for manufacturing a semiconductor device, comprising: a first panel and a second panel having a plurality of elongated partition walls. Wherein a bonding material is disposed on the top of the partition wall, and the first panel and the second panel are bonded by the bonding material. And

Thus, the frequency of 20H generated when the first panel and the second panel come into contact with each other due to vibration during actual driving.
A panel having a noise level of z to 20 kHz of 30 dB or less is realized. In addition, if bonding is performed along the entire top portion of the partition wall, no gap is created between the first panel and the second panel, so that no crosstalk occurs.

Further, even if the panel is used at an altitude of several thousand meters, the central portion of the panel does not expand, so that noise does not increase and crosstalk does not increase. Further, in order to achieve the above object, the present invention provides a first panel and a second panel having a plurality of elongated partition walls interposed therebetween by a sealing material in an outer peripheral region surrounding the partition walls. The display panel is sealed by sealing, wherein the first panel and the second panel are joined by a joining material arranged in an image non-display area.

[0014] In order to achieve the above object, the present invention provides a liquid crystal display device, comprising: a first panel and a second panel having a plurality of elongated partition walls. A display panel sealed with an adhesive, wherein a projection is formed on an inner surface of the first panel facing the second panel, and the first panel and the second panel are formed. Are joined by a joining material at a portion where the projection and the partition wall intersect.

Thus, the frequency 20 generated when the first panel and the second panel come into contact with each other due to the vibration during actual driving.
A panel having a noise level of 30 Hz to 20 dB or less is realized. Also, even if the panel is used at a high altitude of several thousand meters, the center portion of the panel does not expand, so that noise does not increase and crosstalk does not increase.

Here, the display panel may include a plurality of light emitting cells arranged in a row at intervals, and the protrusion may be formed between the cells. This makes it possible to prevent a decrease in the cell aperture ratio due to the invasion of the bonding material into the cell region. Here, the protrusion has a stripe shape orthogonal to the partition wall and continuously formed from the first end of the image display area in which the cells are arranged and formed to the second end opposed thereto. can do.

Here, the projection may be formed in a point shape. Here, when the protrusion is formed between cells, the protrusion can be formed of a dark material. here,
The first panel may include a dielectric layer, and the protrusion may be formed on a surface of the dielectric layer with the same material as that of the dielectric layer.

According to another aspect of the present invention, a first panel and a second panel having a plurality of elongated partition walls are sealed to an outer peripheral region surrounding the partition walls. A method for manufacturing a display panel sealed with a material interposed therebetween, wherein, prior to sealing the first panel and the second panel, an outer peripheral portion of the first panel or the second panel. A sealing material arranging step of arranging the sealing material so as to be higher than the height of the partition wall, and after the step, the first panel and the second panel are arranged on the inner peripheral side of the sealing material forming portion. And a sealing step of performing sealing by softening the sealing material.

Thus, the sealing is performed in a state where there is no gap between the partition and the first panel, and a frequency of 20 Hz generated when the first panel and the second panel come into contact with each other due to vibration during actual driving. A panel having a noise level of ２０20 kHz of 30 dB or less is realized. Here, it is desirable that the pressing portion in the sealing step is a central region of the first panel and the second panel.

Here, the pressing in the sealing step can be performed by a pressure difference between the inside and outside of the panel. Here, the pressing in the sealing step can be performed by a magnetic force acting between magnets of opposite polarities arranged with the first panel and the second panel interposed therebetween.

Here, in the sealing material arranging step, the sealing material may be arranged at a height equal to or higher than the sum of the height of the partition walls, the amount of bending, undulation and warping of the front panel and the rear panel. it can. Further, in order to achieve the above object, the present invention provides a first panel and a second panel having a plurality of elongated partition walls interposed therebetween by a sealing material in an outer peripheral region surrounding the partition walls. Prior to sealing the display panel and the first panel and the second panel are sealed,
A sealing material arranging step of arranging a sealing material on the outer periphery of the first panel or the second panel so as to be higher than the height of the partition wall, and after the step, the first panel and the second panel With pressing the inner peripheral side than the sealing material forming part,
It is characterized by being manufactured through a sealing step of performing sealing by softening the sealing material.

As a result, a display panel sealed with no gap between the partition and the first panel is obtained.
A panel having a noise level of 30 dB or less at a frequency of 20 Hz to 20 kHz generated when the first panel and the second panel come into contact with each other due to vibration during actual driving is realized.

[0023]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be specifically described below with reference to the drawings. <First Embodiment> First, a PDP according to a first embodiment of the present invention will be described. FIG. 3 is a perspective view of a relevant part of the PDP. Although only a few cells are shown in the drawing, in actuality, a large number of cells of each color of red, green, and blue are alternately arranged.

In this PDP, a front panel PA1 and a rear panel PA2 are joined by a joining material, and both panels are sealed with a sealing material (not shown) interposed at an outer peripheral portion of the facing surface. is there. Then, by applying a pulse-like voltage to each electrode, a discharge is generated in the internal space (discharge space 20) of both panels, and visible light of each color generated on the rear panel side with the discharge is applied to the front panel PA1. This is an AC surface discharge type PDP that transmits light through the main surface of the PDP.

The front panel PA1 has the following configuration. That is, the display electrode pairs 12 are arranged on the front glass substrate 11 on which the stripe-shaped display electrode pairs 12 are arranged in parallel.
A dielectric glass layer 13 is formed so as to cover the dielectric glass layer 13, and a protective layer 14 is further formed so as to cover the dielectric glass layer 13. Each of the display electrode pairs 12 is
It comprises a transparent electrode 12a formed on the surface of the glass substrate 11, and a metal electrode 12b formed on the transparent electrode 12a.

On the other hand, the rear panel PA2 has address electrodes 16 on a rear glass substrate 15 in which the address electrodes 16 are arranged in a stripe shape and in a direction perpendicular to the display electrode pairs 12 so as to cover the address electrodes 16. An electrode protection layer 17 that protects and reflects visible light to the front panel side is formed. The electrode protection layer 17 extends on the electrode protection layer 17 in the same direction as the address electrode 16 so as to sandwich the address electrode 16. Partition walls 18 are erected, and a phosphor layer 19 is further arranged between the partition walls 18.

The cell, which is a unit of the light emitting region, refers to an internal space where the display electrode pair 12 and the address electrode 16 intersect. Further, a bonding material Bd is uniformly arranged along the direction in which the partition walls extend on the top of each of the partition walls 18 formed and arranged on the rear panel PA2, and the bonding material Bd is included in the front panel PA1. It is bonded to the surface, that is, the surface of the protective layer 14.

In the structure in which the front panel PA1 and the rear panel PA2 are joined at the top of the partition wall by the joining material Bd in this manner, the noise due to the vibration of the substrate during actual driving is extremely small, and the noise level is reduced to 30d.
B or less. Therefore, since the portion along the top of the partition wall is joined to the front panel, even when used in high altitudes at an altitude of several thousand meters where the atmospheric pressure is low, the difference between the panel internal pressure and the atmospheric pressure causes the front panel and the rear surface to be damaged. It does not swell with the panel, and is excellent in noise reduction effect.

Although the noise level varies depending on the number of partition walls on which the joining material is arranged, if at least one partition wall is joined at the center of the image display area, the noise level can be reduced to 30 d.
B or less, and if all the partition walls and the front panel are joined as described above, the noise level is substantially zero. Further, since there is no gap between the top of the partition wall 18 and the front panel PA1, no crosstalk occurs.

Next, an outline of a method of manufacturing the above PDP will be described. Fabrication of front panel PA1: front panel PA1 forms display electrode pair 12 on front glass substrate 11, covers it with dielectric glass layer 13, and forms protective layer 14 on the surface of dielectric glass layer 13. It is produced by doing.

The display electrode pair 12 is formed by first forming a transparent electrode 12a made of a transparent and conductive metal oxide such as ITO by a method such as sputtering, and then applying a silver paste on the transparent electrode 12a by a method such as screen printing or an ink jet method. After forming a pattern of the metal electrode 12b by applying, a baking is performed. The metal electrode 12b may have a three-layer structure of Cr-Cu-Cr.

The dielectric glass layer 13 includes a plurality of inorganic materials,
For example, 70% by weight of lead oxide [PbO], 15% by weight of boron oxide [B ₂ O ₃ ], 10% by weight of silicon oxide [SiO
₂ ] and a composition obtained by mixing 5% by weight of aluminum oxide and an organic binder [10% ethyl cellulose in α-terpineol] is applied by a printing method such as a screen printing method. At a predetermined temperature (for example, about 500 ° C.) for a predetermined time (for example, about 20 minutes)
It is formed into a predetermined film thickness (for example, 30 μm) by firing.

The protective layer 14 is made of magnesium oxide (Mg)
O) and is formed by electron beam evaporation (EB).
Method). Fabrication of Back Panel PA2: The back panel PA2 has an address electrode 16 formed on a back glass substrate 15, covered with an electrode protection layer 17, and a partition 18 formed on the surface of the electrode protection layer 17 to form a barrier between the partitions. Is formed by forming a phosphor layer 19 on the substrate.

The address electrode 16 is connected to the back glass substrate 15
A silver paste is formed on the upper surface by a method such as screen printing or an inkjet method in the same manner as the metal electrode 12b. The electrode protection layer 17 is formed by printing on the address electrode 16 using a printing method such as a screen printing method and then firing the same, and is formed of a glass composition similar to that of the dielectric glass layer 13. And a thin film containing titanium oxide (TiO ₂ ) particles.

The partition wall 18 is formed by applying a partition wall forming material by a method such as a screen printing method, a lift-off method, or a sand blast method, and then firing the material. The phosphor layer 19 can be formed by baking the printing layer after forming by a general method such as a screen printing method. Alternatively, the phosphor layer 19 can also be formed by baking the ink after applying the ink by a nozzle spray method. .

As the phosphor, those generally used can be mentioned. For example, the following can be used. Red phosphor: Y ₂ O ₃ : Eu ³⁺ Green phosphor: Zn ₂ SiO ₄ : Mn Blue phosphor: BaMgAl ₁₀ O ₁₇ : Eu ²⁺ Completion of PDP by panel bonding: Next, bonding material B
d is placed along the top of the partition 18 and then the front panel P
The front panel PA1 and the rear panel PA2 are sealed in such a manner that the display electrode pairs 12 and the address electrodes 16 are orthogonal to each other by sintering the surface of the protective layer 14 of A1 and the rear panel PA2 while being pressed against each other.

As the bonding material Bd, a paste obtained by kneading a frit obtained by mixing powder such as ceramic with low melting glass and kneading with a resin such as acrylic and a solvent such as terpineol can be used. Thereafter, a discharge gas (for example, a He-Xe-based or Ne-Xe-based inert gas) is sealed in a discharge space 20 partitioned by the partition wall 18 at a predetermined pressure, thereby forming a PDP.
Is completed.

The method of arranging the bonding material on the top of the partition wall 18 may be any method suitable for arranging the bonding material in the narrow region of the top of the partition wall, such as a screen printing method and a photolithography. It can be arranged by printing by a method such as a method. <Embodiment 2> The PDP of the present embodiment has a front panel PA
The structure of Embodiment 1 and the manner of joining the front panel PA1 and the back panel PA2 are different from those of the first embodiment. Hereinafter, the characteristic points will be described.

As shown in FIG. 4, on the inner surface of the front panel PA1, stripe-shaped projections 21 are arranged in parallel with the display electrode pairs 12 and at regular intervals so as to be orthogonal to the partition walls 18. The dimensions of the projection 21 are such that the width W1 is, for example, about the non-display interval between the display electrode pairs, and the thickness T1 from the surface of the recess 22 is, for example, about 3 to 10 μm. The front panel PA1 and the rear panel PA2 are joined at a portion where the partition wall 18 and the projection 21 intersect on the inner surface of the front panel PA1.

FIG. 5 schematically shows a state where the joints are scattered. As shown in this drawing, the front panel PA1 and the rear panel PA2 are joined only at the region 23 (joining portion) where the projection 21 and the partition wall 18 intersect. As described above, since the joining portion is not the entire area along the partition wall in the first embodiment as in the first embodiment, a gap exists between the front panel PA1 and the partition wall 18. However, the joining point extends over the entire panel. Since the noise is widely distributed, noise due to vibration of the substrate during actual driving is extremely small as described above, and the noise level can be suppressed to 30 dB or less.

The noise level varies depending on the number of partition walls on which the bonding material is arranged. If at least one partition wall is bonded at the center of the image display area, the noise level can be reduced to 30 d.
B or less, and if all the partition walls and the front panel are joined as described above, the noise level is substantially zero. Also, since the bonding area is smaller than in the above embodiment,
When the bonding material invades the cell region, the aperture ratio of the cell is not reduced, and display irregularities are hardly generated in the image.

Furthermore, since the joining is performed by providing the protrusion 21, the height of the cell corresponding to the thickness of the protrusion is increased by a certain amount as compared with the case where the protrusion is not formed. Will also be expanded. As a result, the luminous efficiency of one cell can be improved. In addition, by providing the protrusion, the conductance between adjacent cells is increased, and an improvement in the evacuation efficiency in the panel is also expected.

The bonding material Bd may be arranged on the protrusion 21 as shown in FIG. 6 instead of being arranged on the top of the partition wall as described above. Also, as shown in FIG.
d can be selectively disposed only in a portion corresponding to a portion to be joined at the protrusion or the top of the partition wall. This eliminates the use of a bonding material disposed at a portion that is not used for bonding, and makes it possible to slightly reduce the manufacturing cost.

Next, the formation position, shape, and formation method of the protrusion 21 will be described. First, as shown in FIG.
Is preferably formed so as to be located between the cell and the cell. The reason why it is preferable to form between the cells as described above is that when the display electrode pair 12 is formed between the individual electrodes, specifically, the bonding material penetrates into the cell region. Therefore, the aperture ratio of the cell is reduced, or the amount of transmitted light emitted by discharge light emission is reduced, and display unevenness occurs in an image.
This is because such a problem does not occur when a cell is formed between cells.

However, also in the first embodiment,
This effect can be similarly obtained by arranging the bonding material Bd at the disposing positions. However, according to the method of providing the protruding portion 21, the joining position can be obtained without disposing the bonding material at the partition tops. Can be scattered. Therefore, there is an advantage that labor in the manufacturing stage is slightly reduced.

Next, regarding the shape of the projection 21,
The protrusion 21 does not have to be a continuous stripe shape as described above, but may have a discontinuous shape as shown in FIG. Even if it is not such a continuous shape, by providing a large number of discontinuous projections 21 in a wide area, when the bonding material Bd disposed on the top of the partition wall 18 and the projections 21 are adhered to the back panel PA2. Can be joined in a state where the joining positions are scattered as described above.

Here, as shown in FIG. 9, the bonding material Bd has a coating amount of a thickness corresponding to the protrusion so that no gap remains between the front panel PA1 and the back panel PA2 when the front panel PA1 and the rear panel PA2 are bonded to each other. It is desirable to do. Thereby, the joining strength is increased and the crosstalk can be suppressed. Next, a method for manufacturing the above-described protrusion 21 will be described. Basically, after the material layer of the dielectric glass layer 13 is formed, the protrusion 21 is formed by selectively arranging the forming material of the protrusion 21 at a desired position in an aligned state.

More specifically, after the front panel PA1 is aligned with the front glass substrate 11 using a screen plate having an opening at the portion where the projection 21 is to be formed, the projection 21 is formed. Place the material. Alternatively, the projection 2 is patterned by photolithography using a dielectric paste containing a photosensitive material.
Form one.

Further, after forming a dielectric glass layer, forming a photosensitive resist film layer, performing patterning by photolithography, and removing the resist by sandblasting to form the protrusion 21. Can also. Further, as shown in FIGS. 10 and 11, a black stripe BS is formed between the display electrode pairs,
By forming a dielectric glass layer so as to cover it, the surface of the dielectric glass layer corresponding to the thickness of the black stripe BS rises to form the protrusion 21.

In general, the material of the dielectric glass layer is desirably colorless and transparent because it is necessary to transmit the light emitted from the phosphor by excitation of ultraviolet rays to the front panel side. Therefore, the protrusion 21 to be formed is basically required to be formed of a colorless and transparent material of the same material as the dielectric glass layer. However, when the protrusion 21 is formed between cells, that is, in the image display area but in the non-light-emitting area, the material forming the protrusion 21 is a dielectric glass layer as shown in FIGS. It is also possible to apply the same non-clear black or other dark material. Since this is a non-light-emitting region, not only does display image degradation not occur, but by using such a material, display contrast can be improved. Furthermore, when selecting a coloring material, it is also possible to select the same material as the partition. This may reduce the number of materials and reduce costs.

The projection 21 itself may be formed of the bonding material Bd. <Embodiment 3> This embodiment is characterized by a sealing step of bonding the front panel PA1 and the rear panel PA2. This will be described. The front panel PA1
Is a conventional one having no projection.

FIG. 14 is a schematic view showing the sealing step.
Prior to the panel sealing step, a sealing material 24 is arranged and interposed in layers on the outer peripheral portions of the facing surfaces of the front panel and the rear panel (FIG. 14A). The sealing material 24 is a front panel PA1.
Alternatively, it is arranged on the outer peripheral portion of the inner surface of the back panel PA2 so as to be higher than the height of the partition wall 18 (FIG. 3).

After that, the panel members are aligned and arranged to face each other. However, since the sealing material layer formed on the outer peripheral portion of the panel member is higher than the height of the partition wall 18 formed in the display area, Thus, both panel members are brought into contact with and supported only by the sealing material layer at the outer peripheral portion (FIG. 14B). Since the sealing material has not been softened, a certain shape is maintained.

Next, the panel members are sandwiched so as to press the center portions of both panel members surrounded by the sealing material (FIG. 14C). Due to the pressing force arrow Y1, as shown in the figure, both panel members are bent concavely at the central portion with the vertex of the layer of the sealing material 24 as a fulcrum, and the gap is narrowed. Next, both panel members are heated by a heater or the like to soften the sealing material 24. The softened sealing material is pushed outward from the center of the panel member to the outside, and the top of the partition and the inner surface of the opposing panel come into contact. If the sealing material is sufficiently softened and spread, the elasticity of the panel member generates a restoring force on the panel member, so that the panel member facing the partition and the partition top are not only at the center of the panel but also at the outer periphery. A state of uniform contact is obtained (FIG. 14D).

By cooling both panel members in this state, sealing is performed in a state where there is no gap between the partition and the front panel. This solves the problems of noise and crosstalk as described above,
High quality PDP is realized. Here, it is preferable that the height of the layer of the sealing material is not less than the height obtained by adding the amount of deflection, undulation and warpage of the front panel and the back panel to the height of the partition wall. This is because if the top of the partition wall and the inner surface of the opposing panel are in contact with each other in a part of both panels in the state of FIG. 14 (a), the pressing force is not applied uniformly, so that the panel can be brought into uniform contact. This is because they cannot.

Here, the pressing portion in the sealing step is
Preferably, it is the central area of the front and back panels. This is because this allows the front panel to uniformly contact the tops of all the partition walls, thereby improving the degree of adhesion between the front panel and the rear panel. Here, the pressing in the sealing step can be performed by a pressure difference between the inside and outside of the panel. For example, a pressure reducing pump communicated with the panel internal space is operated when the sealing material softens and the internal space becomes airtight, and the panel internal space is depressurized by the vacuum pump, or conversely, the panel is placed in a closed container. When the sealing material softens and the panel internal space becomes airtight, gas is introduced into the container to make it pressurized when the sealing material softens and the panel internal space and the outside are sealed. A pressure differential can be created.

Here, the pressing in the sealing step can also be performed by a magnetic force acting between magnets of opposite polarities arranged with the front panel and the rear panel interposed therebetween. In the present embodiment, the partition and the front panel were not joined, but as shown in FIG. 15, the pseudo partition 2 was located on the outer periphery of the image display area on the inner peripheral side of the sealing material arrangement position.
5 may be provided, and a joining material may be arranged on the top of the pseudo partition to join them. This makes it possible to increase the degree of adhesion between the front panel and the rear panel.

In the case of combination with the first and second embodiments, the central portion of the panel is pressed and sealed, so that the central portion of the panel can be securely joined. Become. Finally, the present invention relates to PD
The present invention can be applied to other display panels such as a field emission display in addition to a gas discharge panel such as P.

The display panel of the present invention can be used for a display panel used as an image display such as a television or a computer monitor.

[0060]

As described above, according to the present invention, the first panel having the first electrode and the second panel having the second electrode face each other, A display panel that performs image display by a time-division image display method in a frame by applying a voltage to the electrode and the second electrode, and the first panel and the second panel come into contact with each other due to vibration during actual driving. The noise level of the generated frequency 20 Hz to 20 kHz is 30
dB or less. Thereby, a high quality display panel is realized.

[Brief description of the drawings]

FIG. 1 is a perspective view of a main part showing a configuration of a PDP according to a conventional example.

FIG. 2 is an explanatory view of a sealing step in a conventional example.

FIG. 3 is a perspective view of a main part showing a configuration of the PDP of the first embodiment.

FIG. 4 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 5 is a plan view showing a junction between a front panel and a rear panel in the PDP of the second embodiment.

FIG. 6 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 7 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 8 is a plan view showing junctions between a front panel and a back panel in the PDP of the second embodiment.

FIG. 9 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 10 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 11 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 12 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 13 is a perspective view of a main part showing a configuration of a PDP according to a second embodiment.

FIG. 14 is an explanatory diagram of a sealing step in the third embodiment.

FIG. 15 is a perspective view illustrating a modification of the third embodiment.

[Explanation of symbols]

 PA1 front panel PA2 rear panel Bd bonding material Bs black stripe 18 partition 21 protruding part 23 bonding part 24 sealing material 25 pseudo partition

Continuation of the front page (72) Inventor Yoshiki Sasaki 1006 Kazuma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. 5C012 AA09 BC03 5C040 FA01 FA04 GB03 GB14 GF02 GF13 GF19 HA01 JA21 MA08 MA23

Claims (17)

[Claims] A first panel having a first electrode and a second panel having a second electrode are opposed to each other, and a voltage is applied to the first electrode and the second electrode. A display panel for displaying an image by an in-frame time-division image display method, wherein a noise level at a frequency of 20 Hz to 20 kHz generated when a first panel and a second panel come into contact with each other due to vibration during actual driving is 30 dB or less. A display panel, characterized in that: 2. A display panel in which a first panel and a second panel having a plurality of elongated partition walls are sealed with a sealing material therebetween in an outer peripheral area surrounding the partition walls. A display panel, wherein a bonding material is disposed on a top portion of the partition wall, and the first panel and the second panel are bonded by the bonding material. 3. A display panel in which a first panel and a second panel having a plurality of elongated partition walls are sealed between the outer peripheral region surrounding the partition walls with a sealing material therebetween. A display panel, wherein the first panel and the second panel are joined by a joining material arranged in an image non-display area. 4. A display panel in which a first panel and a second panel having a plurality of elongated partition walls are sealed with a sealing material therebetween in an outer peripheral region surrounding the partition walls. A projection is formed on the inner surface of the first panel facing the second panel, and the first panel and the second panel are formed at the intersection of the projection and the partition wall. A display panel which is joined by a joining material. 5. The display panel according to claim 4, wherein the display panel includes a plurality of light emitting cells arranged in a row at intervals, and the protrusion is formed between the cells. Display panel. 6. A stripe formed perpendicularly and continuously to a partition from a first end of an image display area formed by arranging cells to a second end opposed thereto. The display panel according to claim 5, wherein the display panel has a shape. 7. The display panel according to claim 5, wherein the protrusion has a point shape. 8. The display panel according to claim 5, wherein said projection is made of a dark material. 9. The method according to claim 1, wherein the first panel includes a dielectric layer, and the protrusion is formed on a surface of the dielectric layer with the same material as that of the dielectric layer. Item 6. The display panel according to Item 5. 10. The display panel according to claim 2, wherein a frequency of 20 Hz to 20 kHz generated when the first panel and the second panel come into contact with each other due to vibration during actual driving.
A display panel having a noise level of 30 dB or less. 11. A display panel in which a first panel and a second panel having a plurality of elongated partition walls are sealed with a sealing material therebetween in an outer peripheral area surrounding the partition walls. In the manufacturing method, prior to sealing the first panel and the second panel, a sealing material on the outer peripheral portion of the first panel or the second panel is higher than the height of the partition wall. A sealing material arranging step of arranging the first panel and the second panel after the step, pressing the inner peripheral side of the sealing material forming portion and softening the sealing material. And a sealing step of performing sealing in the display panel. 12. The method according to claim 11, wherein the pressing portion in the sealing step is a central area of the first panel and the second panel. 13. The method according to claim 1, wherein the pressing in the sealing step is performed by a pressure difference between inside and outside of the panel.
2. The method for manufacturing a display panel according to item 1. 14. The method according to claim 11, wherein the pressing in the sealing step is performed by a magnetic force acting between magnets having opposite polarities arranged with the first panel and the second panel interposed therebetween. The method for manufacturing the display panel described in the above. 15. In the sealing material disposing step, the sealing material is arranged at a height equal to or higher than a height obtained by adding the amount of bending, undulation and warpage of the front panel and the rear panel to the height of the partition wall. The method for manufacturing a display panel according to claim 11, wherein 16. A display panel in which a first panel and a second panel having a plurality of elongated partition walls are sealed between the outer peripheral region surrounding the partition walls with a sealing material therebetween. Prior to sealing the first panel and the second panel, a sealing material is provided on the outer periphery of the first panel or the second panel so as to be higher than the height of the partition. A sealing material disposing step for disposing, and after the step, the first panel and the second panel are pressed by pressing the inner peripheral side of the sealing material forming portion, and the sealing material is softened to seal. A display panel manufactured through a sealing step of performing the following. 17. The display panel according to claim 16, wherein a noise level at a frequency of 20 Hz to 20 kHz generated when the first panel and the second panel come into contact with each other due to vibration during actual driving is 30 dB or less. 16. The display panel according to 16.