JP2009092811A - Manufacturing method for plasma display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a plasma display, allowing bonding, under the condition where an ample holding force is secured to prevent coming-off during transportation and usage, even if a panel size becomes large, and under the condition where noise is restrained from being generated from a panel while driving. <P>SOLUTION: This plasma display is provided with the panel, arranged facing a pair of substrates, with at least a transparent front face for forming a discharge space between the substrates, and having a plurality of discharge cells; a metal chassis member 25 for holding the backface side of the panel 21 by bonding it with an adhesive member, and is constituted to pressurize the panel 21 by a pair of elastic pressor plates, when bonding the panel 21 onto the chassis member 25 via the adhesive member 26; and at least either the pair of pressor plates 28 is constituted, being divided into a plurality of pressing blocks 28a, 28b, 28c. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a method for manufacturing a plasma display device known as a thin, lightweight display device having a large screen.

  In recent years, plasma display devices have attracted attention as display panels (thin display devices) with excellent visibility, and higher definition and larger screens are being promoted.

  This plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types: a surface discharge type and a counter discharge type, but high definition, large screen, and simple manufacturing are possible. Therefore, at present, AC-type and surface-discharge-type plasma display devices are mainly used.

  FIG. 5 is a cross-sectional perspective view showing a schematic structure of a panel in the plasma display device. As shown in FIG. 5, on a transparent front substrate 1 such as a glass substrate, a plurality of stripe-shaped display electrodes 2 paired with a scan electrode and a sustain electrode are formed, and the electrode group is covered. A dielectric layer 3 is formed, and a protective film 4 is formed on the dielectric layer 3.

  A plurality of rows of stripes covered with an overcoat layer 6 are formed on the rear substrate 5 opposite to the front substrate 1 so as to intersect the display electrodes 2 of the scan electrodes and the sustain electrodes. Address electrodes 7 are formed. On the overcoat layer 6 between the address electrodes 7, a plurality of partition walls 8 are arranged in parallel with the address electrodes 7, and a phosphor layer is formed on at least a part of the side surface between the partition walls 8 and the surface of the overcoat layer 6. 9 is formed.

  The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space so that the display electrode 2 and the address electrode 7 of the scan electrode and the sustain electrode are almost orthogonal to each other, and the periphery is sealed, In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas at a pressure lower than the atmospheric pressure of 66.5 kPa (about 500 Torr). In addition, the discharge space is divided into a plurality of sections by partition walls 8 to provide a plurality of discharge cells in which the intersections of the display electrodes 2 and the address electrodes 7 are located, and each of the discharge cells has red, green and blue colors. The phosphor layers 9 are sequentially arranged one by one so that In FIG. 5, the substrate 1 and the substrate 5 are drawn apart from each other so that the above description can be easily understood.

FIG. 6 schematically shows the electrode arrangement of the panel in this plasma display device. As shown in FIG. 6, the scan electrode (SCN), the sustain electrode (SUS), and the address electrode (D) have a matrix configuration of M rows × N columns, and M rows of scan electrodes SCN _{1 to} SCN in the row direction. _M and the sustain electrodes SUS ₁ ~SUS _M is placed, the address electrodes D ₁ to D _N N columns are arranged in the column direction.

  In the plasma display panel having such an electrode configuration, an address pulse is applied between the address electrode and the scan electrode by applying a write pulse between the address electrode and the scan electrode, and after selecting the discharge cell, the scan electrode By applying a periodic sustain pulse that is alternately inverted between the sustain electrode and the sustain electrode, a sustain discharge is performed between the scan electrode and the sustain electrode, and a predetermined display is performed.

  FIG. 7 shows an example of the overall configuration of a plasma display device incorporating the panel having the structure described above. In the figure, a housing for housing the panel 10 is composed of a front frame 11 and a metal back cover 12, and an opening of the front frame 11 is a front cover made of glass or the like that also serves to protect the optical filter and the panel 10. 13 is arranged. Further, the front cover 13 is subjected to, for example, silver vapor deposition in order to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 12 is provided with a plurality of ventilation holes 12a for releasing heat generated in the panel 10 and the like to the outside.

  The panel 10 is bonded to the front surface of the chassis member 14 as a holding plate that also serves as a heat sink made of aluminum or the like via an adhesive member that is a double-sided adhesive or adhesive sheet made of an acrylic, urethane, or silicon material. A plurality of circuit blocks 15 for driving the display of the panel 10 are attached to the rear surface side of the chassis member 14. The circuit block 15 is provided with an electric circuit for driving and controlling the display of the panel 10, and is electrically connected by a plurality of flexible wiring boards (not shown) extending beyond the edge of the panel 10. ing.

  Further, a boss portion 14a for attaching the circuit block 15 or fixing the back cover 12 is protruded from the rear surface of the chassis member 14 by integral molding using die casting or the like. The chassis member 14 may be configured by fixing a fixing pin to an aluminum flat plate.

In such a plasma display device, a double-sided adhesive made of an acrylic, urethane, or silicon material is used for a panel made mainly of glass and a metal holding plate such as aluminum, or a heat conductive sheet is interposed. It was made to adhere and fix (refer patent document 1).
Japanese Patent No. 2807672

  In the plasma display device having such a configuration, the panel 10 and the chassis member 14 as the holding plate must not fall off during transportation or use. Therefore, the panel 10 and the chassis member 14 are sufficiently bonded. Therefore, when the panel 10 and the chassis member 14 are bonded to each other via the adhesive member 15, an appropriate weight is applied as long as the panel is not damaged. Yes.

  Here, in the plasma display device, noise may be generated from the panel 10 when displaying an image. Even when noise is not confirmed in a normal environment, noise may be generated when used in an environment with low atmospheric pressure. Such noise becomes annoying depending on the level of the noise, and significantly deteriorates the quality of the product.

  The cause of the occurrence of noise as described above is considered as follows. That is, the substrate 1 on the front side of the panel 10 is bonded to the substrate 5 on the rear side only by an adhesive member formed in the peripheral portion, and has a structure in which it is in contact with the partition wall 8 formed on the substrate 5. Because of this, when the panel 10 and the chassis member 14 are bonded together, the panel 10 may be deformed depending on the bonding state, and the contact state between the substrate 1 and the partition wall 8 is changed to generate a gap. It is thought that there is a case where it ends up. Such a gap becomes more prominent in places with low air pressure such as highlands.

  Since a periodic voltage is applied to the display electrode 2 and the address electrode 7 of the plasma display device during driving, periodic attractive and repulsive forces act between the substrate 1 and the substrate 5. When there is a gap between the substrate 1 and the partition wall 8 as described above, the substrate 1 and the substrate 5 will vibrate due to the attractive and repulsive forces acting between them, resulting in noise. It is thought that it will do. As the panel size increases, the warpage of the panel 10 and the chassis member 14 also increases, which adversely affects the adhesion area and noise.

  The present invention has been made in view of the above problems, and even when the panel size is increased, generation of noise from the panel being driven while securing a sufficient holding force that does not drop off during transportation or use. An object of the present invention is to realize a method of manufacturing a plasma display device that can be bonded in a state where the above is suppressed.

  In order to achieve the above object, a method for manufacturing a plasma display device according to the present invention includes a panel having a plurality of discharge cells, wherein a pair of substrates at least on the front side are opposed to each other so that a discharge space is formed between the substrates. And a metal holding plate that holds the panel by bonding the back side of the panel with an adhesive member, and when the panel is bonded to the holding plate via the adhesive member, a pair of elastic members The pressure plate is sandwiched between the pressure plates, and at least one of the pair of pressure plates is divided into a plurality of pressure blocks.

  According to the method of manufacturing a plasma display device of the present invention, even when the panel size is increased, noise is generated from the panel being driven in a state in which a sufficient holding force is secured so as not to drop off during transportation or use. It can be pasted together in a state where it is suppressed. Further, the press machine capacity (maximum pressurizing force) may be small due to the divided pressurization, and the guide mechanism that supports the vertical drive is also small. Furthermore, when performing divided pressurization, a uniform load is applied over the entire range of the chassis member with a single pressure plate and constant pressure to the chassis member with a complicated shape having locally reinforcing bars and the like. Although it is difficult to apply, by configuring at least one pressing plate with a plurality of pressing blocks, it is possible to individually set the weighting pressure, the weighting time, and the application timing, and a more uniform weighting can be applied. . Therefore, it is possible to provide a plasma display device capable of displaying a good image.

  Hereinafter, a method for manufacturing a plasma display apparatus according to an embodiment of the present invention will be described.

  FIG. 1 is a cross-sectional view showing a schematic configuration for carrying out a method for manufacturing a plasma display device according to an embodiment of the present invention, and FIG. 2 shows a state after a panel and a holding plate are bonded by the method of the present invention. It is sectional drawing. 1 and 2, the panel 21 includes a front plate 22 and a back plate 23 as shown in FIG. The front plate 22 is configured by forming a plurality of rows of display electrodes on a transparent and insulating front substrate such as a glass substrate, and forming a dielectric layer and a protective film so as to cover the electrode group. Further, the back plate 23 is a plurality of columns of addresses covered with an overcoat layer on an insulating substrate such as glass on the back side that is opposed to the front glass substrate so as to intersect the display electrodes. In addition to forming electrodes, a plurality of barrier ribs are formed on the overcoat layer in parallel with the address electrodes, and a phosphor layer is provided between the barrier ribs. The front plate 22 and the back plate 23 are opposed to each other with a minute discharge space interposed therebetween so that the display electrode and the address electrode are substantially orthogonal to each other, and the periphery is sealed, and helium, A plasma display panel in which a plurality of discharge cells are formed at the intersections of the display electrodes and the address electrodes is obtained by enclosing one or a mixed gas of neon, argon, and xenon as a discharge gas. Color display is possible by sequentially arranging the phosphor layers so as to be red, green and blue.

  A flexible printed wiring board 24 for supplying power to the display electrodes and address electrodes is connected to the front plate 22 and the back plate 23 of the panel 21. In FIG. 2, only the flexible printed wiring board 24 connected to the front plate 22 side is shown.

  The chassis member 25 as a holding plate also serves as a heat radiating plate made of a good heat conductive material such as aluminum, for example, and a panel 21 is displayed on the rear side of the chassis member 25 as shown in FIG. A plurality of circuit blocks for driving are attached.

  The adhesive member 26 is an elastic adhesive sheet in which adhesive layers are formed on both surfaces of an insulating sheet made of, for example, an acrylic, urethane, or silicon material. The panel 21 is attached to the chassis member 25. It is held by being adhered by the adhesive member 26. Here, it is preferable to use the adhesive member 26 having a high thermal conductivity in order to efficiently transmit the heat generated in the panel 21 to the chassis member 25 to dissipate the heat.

  In FIG. 1, a pressing plate 27 on the panel 21 side and a pressing plate 28 on the chassis member 25 side have elasticity to give a buffering action, and one pressing plate 28 includes three pressing blocks 28a. , 28b and 28c. Each of the pressure blocks 28a, 28b, 28c divided into a plurality is connected to a press mechanism unit 30 including pressurizing mechanisms 30a, 30b, 30c that can be independently operated. In addition, in the respective pressing blocks 28a, 28b, and 28c divided into a plurality, the pressing order is not particularly limited, but it is best to press the center for the first time against warping or the like. After pressing the center, there is no problem even if the left end and the right end are sequentially pressed, but if it is necessary to shorten the production tact, they can be pressed simultaneously. The pressing plates 27 and 28 are made of a conductive material in order to remove static electricity generated when a load is applied to the panel 21 and the chassis member 25.

  Furthermore, the capability (maximum pressurizing force) of the press mechanism unit 30 may be small due to the divided pressurization, and the guide mechanism that supports the vertical drive is also small. For example, even when producing a 103-inch panel, the pressing plate 28 may have a size of about 50 inches and a load of about 250 kg. Incidentally, in the case of the conventional batch press method that presses the entire screen, a weight of about 1000 kg must be applied.

  As shown in FIG. 3, the pressing plate 27 on the panel 21 side is equivalent to a buffer material 27 a having a large compressive elastic modulus disposed on the surface side in contact with the panel 21 in order to prevent the panel 21 made of glass material from cracking. A buffer material 27b that is harder than the buffer material 27a that is disposed to apply a heavy load, and a surface that is in contact with the press table 29, and that facilitates the insertion and removal of the press plate 27 to and from the press table 29. It is configured to have a three-layer structure with a resin sheet 27 c having durability such as polypropylene for making it easy to slip and preventing electrification due to friction on the press table 29, and is installed on the press table 29.

  The pressing plate 28 on the chassis member 25 side is brought into contact with the surface of the chassis member 25 on the side where the circuit block is disposed, but the surface of the chassis member 25 on the side where the circuit block is disposed is uneven. The surface on the chassis member 25 side of the pressing plate 28 is provided with unevenness 28d corresponding to the unevenness shape of the chassis member 25. Then, by applying a weight according to the contact area of each of the chassis member 25 and the pressing plates 28a, 28b, and 28c by the press mechanism unit 30, the panel 21 and the chassis member 25 sandwiched between the pressing plates 27 and 28 are locally provided. Weight is added.

  That is, in the present invention, when the panel 21 is bonded to the chassis member 25 via the adhesive member 26, the chassis member 25 to which the adhesive member 26 is bonded is first placed on the panel 21, and the adhesive member 26 side is set to the panel 21 side. The panel 21 and the chassis member 25 are temporarily bonded to each other through the bonding member 26. Thereafter, the temporarily bonded panel 21 and the chassis member 25 are installed on the pressing plate 27 so that the panel 21 side comes, and then the press table 29 is arranged so that the pressing plate 28 comes on the chassis member 25.

  Thereafter, as shown in FIG. 4, the press mechanism unit 30 is lowered and gradually applied with a load until it reaches a predetermined size, and when that predetermined load is reached, the state is maintained for a certain period of time. Thereafter, the panel 21 and the chassis member 25 are bonded via the bonding member 26 by removing the load.

  Here, when the panel 21 and the chassis member 25 are bonded through the bonding member 26, the panel 21 is made of a glass material. Therefore, in order to prevent the panel 21 from being broken, the applied load is reduced. If it is too much, the bonding area between the panel 21 and the chassis member 25 and the bonding member 26 becomes small. As a result, there is a problem that the panel 21 and the chassis member 25 cannot be bonded with a sufficient bonding force. Therefore, in order to secure a sufficient bonding area, when the maximum weight is applied within a range where the panel 21 is not broken, the panel 21 is previously described with respect to the chassis member 25 depending on the applied weight at that time. As a result, there is a problem that noise is generated from the panel 21 when displaying an image. This becomes significant as the warpage of the panel, the holding plate, and the pressing plate increases as the panel size increases.

  However, according to the manufacturing method of the plasma display device according to the embodiment of the present invention described above, when the panel 21 and the chassis member 25 are bonded together via the bonding member 26, the elastic plate is sandwiched between at least By dividing one pressing plate into a plurality of pressing plates having a pressing mechanism, when applying a load with the pressing plate sandwiched between the panel and the holding plate, each of the pressing plates Adhesion is performed by arbitrarily setting a weighted pressure, a weighted time, and an application timing. As a result, the panel 21 can be bonded to the chassis member 25 in a state in which a sufficient adhesive force is ensured without being broken and in a state in which deformation that causes noise is suppressed.

  As described above, according to the method for manufacturing a plasma display device of the present invention, even when the panel size is increased, the panel and the chassis member that is the holding plate are sufficiently bonded to each other by the adhesive member during transportation or use. It can be bonded in a state in which the holding force is secured and the generation of noise from the driving panel is suppressed. Further, the press machine capacity (maximum pressurizing force) may be small due to the divided pressurization, and the guide mechanism that supports the vertical drive is also small. Furthermore, when performing divided pressurization, a uniform load is applied over the entire range of the chassis member with a single pressure plate and constant pressure to the chassis member with a complicated shape having locally reinforcing bars and the like. Although it is difficult to apply, by configuring at least one of the pressure plates with a plurality of pressure plates having a pressure mechanism, it is possible to individually set the weight pressure, weight time, and application timing, and more even weight Can be applied. Therefore, it is possible to provide a plasma display device capable of displaying a good image.

  As described above, according to the present invention, the invention is useful for improving the quality of the plasma display device.

Sectional drawing which shows the condition which is implementing the manufacturing method of the plasma display apparatus by one embodiment of this invention Sectional drawing which shows the state which affixed the panel and the chassis with the manufacturing method of this invention Sectional drawing which shows an example of the press plate and adhesive member used for the manufacturing method of this invention The characteristic view which shows the pressurization step in the manufacturing method of this invention Explanatory drawing which shows the electrode arrangement of the panel of a plasma display apparatus Electrical wiring diagram of the panel The exploded perspective view which shows an example of the whole structure of a plasma display apparatus

Explanation of symbols

21 Panel 25 Chassis member (holding plate)
26 Adhesive member 27 Press plate 28 Press plate 28a, 28b, 28c Press block 29 Press stand 30 Press mechanism

Claims (2)

A pair of substrates transparent at least on the front side are arranged so as to form a discharge space between the substrates, and a panel having a plurality of discharge cells is bonded to the back side of the panel with an adhesive member to hold the panel. A metal holding plate that is configured to press between the pair of elastic pressing plates when the panel is bonded to the holding plate via an adhesive member, and the pair of pressing plates Of these, at least one pressing plate is divided into a plurality of pressing blocks, and the method for manufacturing a plasma display panel device. The method for manufacturing a plasma display panel according to claim 1, wherein the plurality of pressing blocks can arbitrarily set a weighted pressure.

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