JP2006078936A - Plasma display device and its manufacturing method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To increase the adhesion area of a double-sided adhesive material and a plasma display panel with each other by removing air confined between them. <P>SOLUTION: A plasma display device is composed of the plasma display panel 16, a metal support member 18 for supporting the plasma display panel and the double-sided adhesive material 20 for fixing the plasma display panel and the metal support member with each other. The metal support member 18 is provided with at least one hole 22, and the double-sided adhesive material 20 has a scratch 36 provided by a tool inserted from the hole 22 of the metal support member 18 so as to remove the air 24 confined between the plasma display panel 16 and the double-sided adhesive material 20. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a plasma display device and a manufacturing method thereof.

  The plasma display device includes a plasma display panel in which two glass substrates are arranged to face each other, and a drive control circuit for driving and controlling the plasma display panel. The plasma display panel is provided with electrodes that extend vertically and horizontally and a fine cell structure, and an image can be displayed by passing a drive current through the electrodes. Further, the plasma display panel is fixed to a metal support member, and the metal support member is incorporated in a housing of an image forming apparatus such as a television apparatus. The plasma display panel and the metal support member are fixed to each other by a double-sided adhesive.

  The plasma display panel generates heat when displaying an image. Part of the heat generated by the plasma display panel is radiated directly into the air from the display surface of the plasma display panel, and part of the heat is transferred from the back surface of the plasma display panel to the metal support member via the double-sided adhesive. In this way, it is desirable that the heat generated by the plasma display panel is released to the outside so that the temperature of the plasma display panel does not rise above a predetermined temperature even during long-time operation. The metal support member is made of a metal plate such as aluminum or aluminum alloy in consideration of durability, heat transfer properties, strength characteristics, and the like. The double-sided adhesive desirably transfers heat well from the plasma display panel to the metal support member.

  In addition, in the plasma display panel, the luminance changes as the temperature changes, and the luminance tends to decrease under high temperature conditions. Therefore, it is necessary to avoid a large temperature difference depending on the position within the display surface. It is desirable that the double-sided adhesive transfers heat so that a large temperature difference does not occur at each position within the display surface.

  The plasma display panel is characterized in that it can realize a large screen. For example, the area of a rectangular plasma display panel ranges from 800 to 1500 mm in diagonal length. It is very difficult to manufacture in such a manner that the entire surface of such a large plasma display panel is covered with one large sheet-like double-sided adhesive. Therefore, a plurality of sheet-like double-sided adhesives are prepared with respect to the entire surface of the plasma display panel, and these double-sided adhesives are arranged and attached in parallel to the plasma display panel. At this time, even if the two adjacent double-sided adhesives are not in contact with each other, an acceptable gap may be provided between the two adjacent double-sided adhesives. Even if such an allowable interval is present, the display luminance can be substantially unaffected.

  The problems with the structure where double-sided adhesive is applied to the metal support member and the plasma display panel are that air is trapped between the metal support member and the double-sided adhesive, and that air is trapped between the plasma display panel and the double-sided adhesive. Is to be. When air is trapped between the metal support member and the double-sided adhesive and between the plasma display panel and the double-sided adhesive, the air creates a region that is not sufficiently bonded by the double-sided adhesive, and heat Transmission is reduced.

  In the manufacture of the plasma display device, one adhesive surface of the double-sided adhesive is first attached to the metal support member, and then the other adhesive surface of the double-sided adhesive to which the metal support member is attached is attached to the plasma display panel. According to this bonding sequence, the air trapped between the metal support member and the double-sided adhesive can be removed to some extent. That is, when the double-sided adhesive is first applied to the metal support member, the release material sheet is peeled off on one adhesive surface of the double-sided adhesive, and the release material sheet is attached on the other adhesive surface of the double-sided adhesive. Since the double-sided adhesive has flexibility, the double-sided adhesive can be applied to the metal supporting member while extruding air between the double-sided adhesive and the metal supporting member. For this reason, the amount of air trapped between the double-sided adhesive and the metal support member is small, and even if air is trapped between the metal support member and the double-sided adhesive, the air can be removed. For example, air can be pushed out from the end of the double-sided adhesive by rubbing with a spatula-like tool from the top of the release agent sheet of the double-sided adhesive.

  It is difficult to remove the air trapped between the plasma display panel and the double-sided adhesive. When a double-sided adhesive with a metal support member is attached to a plasma display panel, air is easily trapped between the plasma display panel and the double-sided adhesive, and it is difficult to remove the trapped air. In other words, sticking a double-sided adhesive with a metal support member to a plasma display panel is the same as sticking a rigid body and a rigid body to each other, and pushes air between the double-sided adhesive and the plasma display panel. However, it is difficult to apply a double-sided adhesive to the plasma display panel. In addition, an air layer is formed due to undulation or warping on the surface of the double-sided adhesive and the plasma display panel, or a subtle difference in the thickness dimension of the double-sided adhesive. Also, it is difficult to push out the air between the double-sided adhesive and the plasma display panel using a spatula-like tool.

  When adopting the order in which the double-sided adhesive is first applied to the plasma display panel, the flexibility and spatility of the double-sided adhesive is the same as in the case of adopting the order in which the double-sided adhesive is first applied to the metal support member. By using a shaped tool, the amount of air trapped between the double-sided adhesive and the plasma display panel can be reduced. However, if you rub with a spatula tool from the double-sided adhesive release sheet, the pressure of the spatula tool will be transmitted to the plasma display panel via the double-sided adhesive, destroying the fine structure inside the plasma display panel. Because there is a possibility that.

  In order to solve such problems, in a configuration in which a heat transfer sheet is interposed between a plasma display panel and a metal support member (frame chassis), a lattice-like uneven structure including convex portions and concave portions is formed on the heat transfer sheet. There is a proposal to provide (see, for example, Patent Document 1). When pressure is applied between the plasma display panel and the frame chassis at the time of manufacture, the convex portion is crushed and air is removed to the outside through a passage formed by the concave portion. However, in this structure, when the material of the convex part to be crushed sinks into the concave part and the passage formed by the concave part is blocked, the air cannot be escaped.

  Also, in a configuration where the plasma display panel and the metal support member (main frame) are fixed with a double-sided adhesive (adhesive tape), a plurality of holes are provided in the main frame, and air is confined between the adhesive tape and the main frame. There is a proposal to prevent this from occurring (for example, see Patent Document 2). However, this conventional technique cannot remove the air trapped between the adhesive tape and the plasma display panel.

  Moreover, in the structure which fixes a plasma display panel and a metal support member (chassis member) with a double-sided adhesive (thermal conductive sheet), a plurality of holes are provided in each of the chassis member and the adhesive tape, and the thermal conductive sheet and the plasma display are provided. There is a proposal to remove air trapped between the panels (for example, see Patent Document 3). However, in this prior art, the hole of the adhesive tape is the same size as the hole of the chassis member, and there is a problem that the effective bonding area of the adhesive tape is reduced. Moreover, the hole of a chassis member and the hole of an adhesive tape must be provided so that it may correspond, and the operation | work which provides a hole in a chassis member and an adhesive tape is required.

JP 10-254372 A JP 2002-323863 A JP 2003-131581 A

  An object of the present invention is to provide a plasma display apparatus and a method for manufacturing the same, which can remove air trapped between the double-sided adhesive and the plasma display panel and thereby increase the adhesion area between them. is there.

  A plasma display apparatus according to the present invention includes a plasma display panel comprising a pair of glass substrates, a metal support member that supports the plasma display panel, and at least one double-sided adhesive that fixes the plasma display panel and the metal support member to each other. The metal support member has at least one hole, and the double-sided adhesive has a hole in the metal support member to remove air trapped between the plasma display panel and the double-sided adhesive. It is characterized by having a wound made by a tool inserted from.

  In the method of manufacturing a plasma display device according to the present invention, at least one hole is provided in a metal support member, and at least one double-sided adhesive is attached to the metal support member, and the metal support member of the double-sided adhesive is attached. Air that is confined between the plasma display panel and the double-sided adhesive is attached to the plasma display panel on the opposite side to the plasma display panel, and a tool is inserted through the hole of the metal support member to damage the double-sided adhesive. Is removed through the wound.

  In the above configuration, a hole is provided in an appropriate position matching the shape of the double-sided adhesive on the metal support member, and after attaching the two glass substrates of the plasma display panel to each other, a tool is inserted through this hole. A scratch (a tear) is made on the double-sided adhesive, and air trapped between the double-sided adhesive and the plasma display panel is removed through the scratch. Further, preferably, air trapped between the double-sided adhesive and the plasma display panel is sucked and removed from the metal support member side using a reduced pressure pad or the like. By removing the air trapped between the double-sided adhesive and the plasma display panel, the adhesion area between the two is increased, and improvement in mechanical and thermal characteristics and uniformity thereof can be realized.

  By using this means, the adhesive strength as the mechanical strength of the double-sided adhesive between the plasma display panel and the metal support member can be increased, and a double-sided adhesive with a lower adhesive strength can be used. Since the area increases, heat transfer is improved and a double-sided adhesive with low thermal conductivity can be used. Furthermore, the display luminance characteristic becomes more uniform through the improvement of the uniformity of adhesion. Adhesives with low-level properties are naturally low-priced, surpassing the costs required for additional processes such as drilling and decompression of metal support members, and lower-cost and higher-performance plasma display devices Can be supplied.

  According to the present invention, it is possible to remove the air trapped between the double-sided adhesive and the plasma display panel, and thus the adhesion area between them can be remarkably increased, so that the display performance is excellent. Therefore, a plasma display device with lower cost can be obtained.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic sectional view showing a plasma display device according to the present invention, and FIG. 2 is a schematic exploded perspective view of the plasma display device of FIG. The plasma display apparatus 10 includes at least one plasma display panel 16 including a pair of glass substrates 12 and 14, a metal support member 18 that supports the plasma display panel 16, and the plasma display panel 16 and the metal support member 18. And two sheet-like double-sided adhesives 20. The sheet-like double-sided adhesive 20 is called a double-sided tape. The plasma display panel 16 (glass substrates 12 and 14) is provided with electrodes that extend vertically and horizontally and a fine cell structure, and an image can be displayed by passing a drive current through the electrodes. The metal support member 18 is incorporated in a housing of an image forming apparatus such as a television apparatus. The metal support member 18 is made of a metal plate such as aluminum or aluminum alloy in consideration of durability, heat transfer properties, strength characteristics, and the like.

  1 and 2, four sheet-like double-sided adhesives 20 are arranged on the entire surface of the plasma display panel 16, and are attached to the plasma display panel 16 while being arranged in parallel at intervals. The four double-sided adhesives 20 are arranged side by side in the longitudinal direction of the plasma display panel 16. However, the number of the double-sided adhesives 20 is not limited and may be one large sheet-like double-sided adhesive 20.

  The metal support member 18 has a hole 22, and the double-sided adhesive 20 is a blade-like shape inserted from the hole 22 of the metal support member 18 in order to remove air trapped between the plasma display panel 16 and the double-sided adhesive 20. With a wound 36 (FIG. 9) provided by the tool 28 (FIG. 8).

  FIG. 3 is a diagram showing a process of applying the double-sided adhesive 20 to the metal support member 18 in the manufacture of the plasma display device 10, and FIG. It is a figure which shows the process affixed on the panel 16. FIG. Thus, according to the sequence in which one adhesive surface of the double-sided adhesive 20 is first applied to the metal support member 18 and then the other adhesive surface of the double-sided adhesive 20 is applied to the plasma display panel 16, as described above, the metal The air trapped between the support member 18 and the double-sided adhesive 20 can be considerably removed, but it is difficult to remove the air trapped between the plasma display panel 16 and the double-sided adhesive 20.

  FIG. 5 is a view showing an example of air 24 confined between the plasma display panel 16 and the double-sided adhesive 20. The layer of the air 24 schematically shown here is often found in the central portion of each double-sided adhesive 20. This is because, in the peripheral part of each double-sided adhesive 20, air escapes from the gaps in the peripheral part of the double-sided adhesive 20 and relatively good adhesion can be achieved, whereas there is no way for air to escape in the central part. Due to

  FIG. 6 is a schematic cross-sectional view showing a pseudo plasma display apparatus for an experiment using one transparent glass 26 instead of the plasma display panel 16. FIG. 7 is a plan view showing the pseudo plasma display apparatus of FIG. As the glass 26, a glass 26 having the same strength, rigidity, and flatness as the plasma display panel 16 including the pair of glass substrates 12 and 14 in FIGS. 1 to 5 was used. In this pseudo plasma display device, a layer of air 24 between the glass 26 and the double-sided adhesive 20 can be observed through the transparent glass 26. Since the actual plasma display panel 16 has an internal cell structure, the layer of the air 24 cannot be observed directly, so this experiment was performed.

  Air 24 is present in a fairly large proportion of the total area of double-sided adhesive 20. The presence of air 24 is not preferable in terms of adhesion performance and heat transfer performance. Further, since the bonding operation is normally performed at room temperature, the temperature of the trapped air 24 is close to the room temperature during the bonding operation. However, when the plasma display device 10 is operated for display, the plasma display panel 16 is several. Shows a 10 degree temperature rise. The air 24 changes in volume by about 15 to 20% depending on its temperature.

  On the other hand, since the other constituent materials have a volume change of less than 1% even with the double-sided adhesive 20 having the largest thermal expansion coefficient, the area of the actual display state is larger than the state of the air 24 obtained in the experiment. It is thought that the gap height is exhibited. If the display state and the resting state are repeated, expansion and contraction of the trapped air 24 are repeated, and the air 24 repeatedly applies stress to other members and causes distortion. The air 24 shown here has an order of magnitude characteristic of other components in heat transfer characteristics.

  That is, when the thermal conductivity of air is compared with the heat transfer coefficient of the metal support member 18, the plasma display panel 16, and the double-sided adhesive 20, the thermal conductivity of the double-sided adhesive 20 that is the material showing the lowest value, The thermal conductivity of air corresponds to 0.05 times. In order to allow the same amount of heat to flow in the region where the double-sided adhesive 20 is in close contact with the metal support member 18 and the plasma display panel 16, the thickness of the layer of the air 24 is used. Must be 0.05 times the thickness of the double-sided adhesive 20.

  Since the air 24 exists between the double-sided adhesive 20 and the plasma display panel 16, even if the thickness of the layer of the air 24 is as small as 0.001 times that of the double-sided adhesive 20, it is compared with the case where it is in close contact. It will inhibit heat transfer. In general, a layer of air 24 with a thickness corresponding to 5.26% of the thickness of double-sided adhesive 20 results in approximately the same effect as a double-sided adhesive 20 thickness increase. Become. If the layer of the air 24 thus confined exists in a large area ratio, the heat flow is inhibited accordingly, and the temperature rise of the plasma display panel 16 is increased, which enlarges the dimension of the layer of the air 24 and further increases the temperature. It acts to make the heat flow worse. This will create a vicious circle of positive feedback.

  The presence of the air 24 means a reduction in the bonding area, and the bonding force for holding the plasma display panel 16 is smaller than that assumed in the initial design. However, practically, if the bonding area of the conventional level can be secured, the mechanical coupling strength between the plasma display panel 16 and the metal support member 18 can be sufficiently secured.

  FIG. 8 shows a blade-like tool 28 for removing the air 24 trapped between the plasma display panel 16 and the double-sided adhesive 20 after the bonding process of the double-sided adhesive 20 and the plasma display panel 16 of FIG. It is a figure which shows the process of scratching the double-sided adhesive. FIG. 9 is a diagram showing a step of sucking and removing air with the vacuum pad 30 after the step of scratching the double-sided adhesive 20 of FIG.

  FIG. 10 is a side view showing the blade-like tool 28 used in FIG. 8, and FIG. 11 is a cross-sectional view of the blade-like tool 28 viewed from the left side of FIG. The blade-like tool 28 has a needle-like tip portion 31 and a hook 32. The front portion of the collar 32 is a cross-shaped contact portion 32A orthogonal to the central axis. In the embodiment, the blade-like tool 28 is shown as having a needle-like tip portion 31, but the blade-like tool 28 has any tip shape as a tool for scratching the double-sided adhesive 20. can do.

  For example, FIG. 12 is a schematic diagram showing an example of the tip shape of a blade-like tool 28 that scratches the double-sided adhesive 20. FIG. 12A shows a circular tip shape 31. FIG. 12B shows an elliptical tip shape 31. FIG. 12C shows a square tip shape 31. FIG. 12D shows a rectangular tip shape 31. FIG. 12E shows a diamond-shaped tip shape 31. The tip shape of the blade-like tool 28 is not limited to the illustrated example.

  In FIG. 8, the needle-like tip portion 31 of the blade-like tool 28 is inserted from the hole 22 provided in the metal support member 18, and the double-sided adhesive 20 is scratched (FIG. 9). The air 24 trapped between the adhesives 20 is removed. The air 24 trapped between the plasma display panel 16 and the double-sided adhesive 20 has a pressure higher than the atmospheric pressure while maintaining a balance with the deformation of the double-sided adhesive 20 that is most easily deformed among the surrounding members. Therefore, by attaching a flaw (cut) 36 to the double-sided adhesive 20 at the needle-like tip portion 31 of the blade-like tool 28, the trapped air 24 spreads the portion including the flaw 36 of the double-sided adhesive 20. Spouts into the atmosphere. When the air 24 is ejected, the portion including the scratch 36 of the double-sided adhesive 20 becomes a shape that approaches the surface of the plasma display panel 16. Since the needle-like tip portion 31 of the blade-like tool 28 is smaller than the hole 22 of the metal support member 18, the scratch 36 applied to the double-sided adhesive 20 is considerably smaller than the hole 22 of the metal support member 18.

  If the needle-like tip portion 31 of the blade-like tool 28 passes over the double-sided adhesive 20 and is strongly pressed against the surface of the plasma display panel 16, the surface of the plasma display panel 16 may be damaged. However, considering that the blade-like tool 28 is stabbed into the portion of the double-sided adhesive 20 swelled under the pressure of the air 24, the needle-like tip portion 31 of the blade-like tool 28 is strong against the double-sided adhesive 20. It is not necessary to press, so that the needle-like tip portion 31 of the blade-like tool 28 can be prevented from damaging the surface of the plasma display panel 16. Furthermore, the knife-like tool 28 is pierced into the double-sided adhesive 20 by a limited distance so that the needle-like tip portion 31 of the knife-like tool 28 does not come into strong contact with the surface of the plasma display panel 16. For this reason, the blade-shaped tool 28 is provided with a flange 32 having a diameter larger than the size of the hole 22 of the metal support member 18, and the blade-shaped tool 28 has a contact portion 32 </ b> A of the flange 32 with the metal support member 18. It only advances to the position where it hits the surface.

  Further, in FIG. 8, a blade-like tool 28 that damages the double-sided adhesive 20 is pierced into the double-sided adhesive 20 by the pressing force of an elastic member, for example, a spring 34. The spring 34 advances the blade-like tool 28 with a relatively small force so that a force beyond a certain level is not applied to the metal support member 18 after the contact portion 32A of the collar 32 contacts the metal support member 18. It has become. Accordingly, the blade-like tool 28 is advanced toward the double-sided adhesive 20 with a relatively small force by the pressing force of the spring 34, and the needle-like tip portion 31 of the blade-like tool 28 is moved to the surface of the plasma display panel 16. The plasma display panel 16 (glass substrate) is not damaged.

  In FIG. 9, the double-sided adhesive 20 is scratched in the step shown in FIG. The decompression pad 30 has an opening lip 30 </ b> A at one end, and the opening lip 30 </ b> A is brought into close contact with a flat surface around the hole 22 of the metal support member 18. The other end 30B of the decompression pad 30 is connected to a vacuum source (not shown) and is evacuated as indicated by an arrow. The decompression pad 30 positively extracts air 24 trapped between the double-sided adhesive 20 and the plasma display panel 16 through the hole 22 of the metal support member 18 and the scratch 36 of the double-sided adhesive 20. For simplicity, only one hole 22 and one vacuum pad 30 are shown here. The shape of the pressure-reducing pad 30 and the number of holes 22 and scratches 36 to be depressurized using the same may be appropriately selected in consideration of the positional relationship, arrangement, and quantity of the holes 22 provided in the metal support member 18.

  As described with reference to FIG. 8, the double-sided adhesive 20 is scratched 36, and the opening area of the scratch 36 of the double-sided adhesive 20 is expanded by the ejection of air trapped inside, so that the double-sided adhesive spread. If the trapped air is extracted by the decompression pad 30 through the 20 scratches 36, the air can be reliably discharged. By reducing the amount of trapped air, the direct contact area between the plasma display panel 16 and the double-sided adhesive 20 is expanded, and the original adhesive performance is achieved. Further, the suction by the pressure reducing pad 30 causes a vacuum to act on the inner surfaces of the plasma display panel 16 and the double-sided adhesive 20 having a layer of air 24, and the trapped air is discharged, and the double-sided adhesive 20 is removed from the plasma display Adsorbed toward the panel 16, the double-sided adhesive 20 is brought into close contact with the plasma display panel 16.

  In the initial short period of the bonding with the double-sided adhesive 20, there is a tendency to increase the bonding strength depending on the passage of time after the double-sided adhesive 20 and the plasma display panel 16 come into contact with each other. Therefore, if the pressure is reduced immediately after the operation of making the scratches 36 on the double-sided adhesive 20, most of the trapped air can be extracted.

  FIG. 13 is a cross-sectional view showing the metal support member 18. FIG. 14 is a plan view showing the metal support member 18 of FIG. The metal support member 18 has a plurality of holes 22. The metal support member 18 has four groups A, B, C, and D holes 22. The holes 22 are arranged in conformity with the arrangement and shape of the double-sided adhesive 20. As shown in FIG. 1, the metal support member 18 of FIGS. 13 and 14 is formed corresponding to a configuration in which four sheet-like double-sided adhesives 20 are arranged in parallel and spaced apart from each other. The region where the holes 22 of each group A, B, C, D are located corresponds to the region where each double-sided adhesive 20 is applied.

  Four double-sided adhesives 20 are arranged side by side along the longitudinal direction of the metal support member 18, and the longitudinal direction of the metal support member 18 is the short direction of each double-sided adhesive 20. The holes 22 of the metal support member 18 are arranged symmetrically on both sides of the center line of the short dimension of each double-sided adhesive 20. That is, for each group A, B, C, D, there are three rows of holes 22, and the holes 22 in the center row are on the center line of the short dimension of each double-sided adhesive 20, and the holes 22 on both sides. Are symmetrically arranged on both sides of the center line. Further, the holes 22 on both sides may be arranged on both sides of the center line in a balanced manner instead of symmetrically. For example, the holes 22 may be arranged on both sides of the center line in a staggered manner.

  Further, for the two adjacent groups A, B, C, and D, the distance between the two holes 22 located on the outer periphery of each of the two adjacent double-sided adhesives 20 (for example, the right side of the group A in FIG. The distance between the holes 22 in the row and the holes 22 in the left row of the group B) is the distance between the two holes 22 in each double-sided adhesive 20 (the adjacent two rows of the three rows of holes 22 in each group). Larger than the interval of the holes 22). That is, the four double-sided adhesives 20 are arranged in parallel at intervals, and the hole 22 is not necessary in a region corresponding to the interval between the two adjacent double-sided adhesives 20. Even if there is no hole 22 in the outer peripheral portion of the air 20, the air 24 is hardly confined.

  In the embodiment, the hole 22 of the metal support member 18 is arranged corresponding to the configuration in which the four sheet-like double-sided adhesives 20 are arranged in parallel with a space between each other. Can be changed, the arrangement of the holes 22 of the metal support member 18 can be changed.

  FIG. 15 is a cross-sectional view showing a pseudo plasma display device including the metal support member 18 of FIGS. 13 and 14. 16 is a plan view showing the pseudo plasma display device of FIG. The pseudo plasma display device of FIGS. 15 and 16 uses a single transparent glass 26 instead of the plasma display panel 16 as in the pseudo plasma display device of FIGS. FIGS. 15 and 16 are observed using a transparent glass 26 in order to estimate the state of the air 24 layer confined between the plasma display panel 16 and the double-sided adhesive 20 of FIGS. 13 and 14. is there.

  In the pseudo-plasma display device of FIGS. 15 and 16, the double-sided adhesive 20 is scratched 36 with a blade-like tool 28 as shown in FIG. 8, the air is discharged, and further, as shown in FIG. Air is sucked and discharged. Therefore, the area occupied by the trapped air 24 is remarkably reduced as compared with the layer of the air 24 shown in FIGS. 6 and 7, and the glass 26 and the double-sided adhesive 20 are bonded almost on the entire surface. If such an adhesive state is realized, the bonding force between the plasma display panel 16 and the metal support member 18 is increased, and the resistance force to the external force in all directions is increased, and at the same time, the plasma display panel 16 to the metal support member 18 is increased. Heat transfer is increased, and uniform heat transfer characteristics with extremely small deviation between the two can be realized.

  Therefore, the temperature rise caused by the display action of the plasma display panel 16 is also suppressed, and the display luminance that is influenced by the temperature distribution can be uniform and higher.

  The arrangement and the number of holes 22 provided in the metal support member 18 are not limited to those shown in the figure, and are sufficient to eliminate the air 24 trapped within a range that does not adversely affect the strength and deformation of the metal support member 18. Should be stipulated. It has been confirmed that the heat transfer characteristics can be maintained thermally uniform by setting the interval between the plurality of sheet-like double-sided adhesives 20 to the thickness of the plasma display panel 16, and the metal support member 18. If the size of the hole 22 is equal to or less than this, it may be considered that there is no problem from the viewpoint of heat transfer.

  Regarding the mechanical strength, since the coupling force between the metal support member 18 and the plasma display panel 16 is dramatically increased by eliminating the trapped air 24, it is necessary to consider a decrease in strength due to the provision of the holes 22. Are thought to be rare. Even if the total area of the holes 22 reaches about 5 to 10% of the total area of the metal support member 18, it is considered that the assembled overall strength of the metal support member 18 and the plasma display panel 16 bonded by bonding is improved. It is done. For example, assuming that the diameter of the hole 22 is 6 mm which is substantially equal to the thickness of the plasma display panel 16 and the holes 22 are arranged in a square arrangement, the total area of the hole 22 with respect to the area of the metal support member 18 is calculated. When the ratio is 5%, the distance between the centers of the holes 22 is 24 mm, and when the ratio is 10%, the distance between the centers of the holes 22 is calculated as 17 mm. Therefore, even if the holes 22 are provided at a very high density, there is no problem in strength.

  From the observation results in the experiment schematically shown in FIGS. 15 and 16, the region of the trapped air 24 is considerably larger than the example of the interval of the holes 22 calculated here. It is considered that a density of about 1% (the distance between the centers of the holes 22 is about 53 mm) is sufficient. Therefore, it can be expected that the influence of providing the holes 22 both thermally and mechanically can be ignored.

  FIG. 17 is a diagram showing a process of removing air with an air removing device 38 including a blade-like tool 28 and a vacuum pad 30. The air removing device 38 is applied to one hole 22 provided in the metal support member 18. The needle-like tip portion 31 of the blade-like tool 28 and the hook 32 that hits the metal support member 18 are located inside the pressure-reducing pad 30, and the spring 34 of the blade-like tool 28 is located outside the pressure-reducing pad 30. In this case, the case where the blade-shaped tool 28 is pressed against the double-sided adhesive 20 and the scratches 36 are made on the double-sided adhesive 20 with the vacuum pad 30 being decompressed is schematically shown. In this way, if the operation of extracting the trapped air 24 is performed in a decompressed state, the operation of first scratching the double-sided adhesive 20 and the operation of depressurizing by the decompression pad 30 are performed separately. The air can be removed more effectively than when the trapped air 24 is extracted. It is assumed that the trapped air 24 has a pressure higher than the atmospheric pressure as described above, and if the pressure is first reduced by the pressure reducing pad 30, the double-sided adhesive 20 becomes more and more metal due to the action of the internal pressure and the suction action from the outside. It is pushed outwardly of the support member 18 where it can be easily scratched by a blade-like tool 28. Therefore, the scratch 36 can be made before the needle-like tip portion 31 of the blade-like tool 28 reaches the surface of the plasma display panel 16. Further, the scratch 36 of the double-sided adhesive 20 is enlarged, and the internal air 24 is eliminated through the scratch 36 as a path.

  FIG. 18 is a diagram showing a process of removing air with an air removing device 38 including a blade-like tool 28 and a vacuum pad 30. In the embodiment of FIG. 18, the air removal device 38 is applied simultaneously to the plurality of holes 22 provided in the metal support member 18. The blade-like tool 28 and the vacuum pad 30 are the same as those in the embodiment of FIG. 17 and are used in the same manner. However, the plurality of decompression pads 30 can be integrally formed.

  Next, the scratches 36 formed on the double-sided adhesive 20 and the holes 22 provided in the metal support member 18 will be considered. Since the area of the scratches 36 applied to the double-sided adhesive 20 is quite small in total, the presence of the scratches 36 does not significantly affect heat transfer and strength, resulting in the advantage of increased bond area. About the hole 22 provided in the metal supporting member 18, the position, a magnitude | size, and an area are good to determine appropriately. Basically, the total area of the holes 22 is determined so that the heat generated by the plasma display panel 16 is transmitted to the metal support member 18 through the double-sided adhesive 20 to the metal support member 18 without the holes 22. It is better to make it small enough to be ignored compared to the case where it is transmitted.

  The plasma display panel 16 includes a pair of glass substrates 12 and 14. When the heat transfer in the plasma display device 10 was examined, the total dimension of the thickness of the glass substrate 14 closer to the metal support member 18 and the thickness of the double-sided adhesive 20, that is, the heat generating portion and the metal in the plasma display device 10. It has been found that the distance from the surface of the support member 18 is a practical reference. In this case, the total area of the holes 22 is preferably smaller than the area of a circle whose radius is the total dimension of the thickness of the glass substrate 14 closer to the metal support member 18 and the thickness of the double-sided adhesive 20. If the area of the hole 22 is smaller than the area of the circle whose radius is the total dimension, the shape of the hole 22 does not significantly affect the temperature difference of the surface of the plasma display panel 16. In this case, it is better to limit the area occupied by the hole 22 to a range of 10% or less compared to the area of the double-sided adhesive 20.

  When the plasma display panel 16 is bonded and fixed to the metal support member 18 with the double-sided adhesive 20, only one large double-sided adhesive 20 may be used, but it may be divided into several double-sided adhesives 20. This is practical from the viewpoints of work efficiency, elimination of the air 24 trapped between the double-sided adhesive 20 and the plasma display panel 16. A hole 22 providing a passage for extracting air taken in between the plurality of divided double-sided adhesives 20 and the plasma display panel 16 is one per one of the plurality of divided double-sided adhesives 20. If it is not provided more than one, there is a region where air cannot be extracted, resulting in leaving air, and the effect of the present invention cannot be fully realized. Therefore, at least one hole 22 is required per one double-sided adhesive 20.

For example, taking the metal support member 18 of the 42V type plasma display panel 16 as an example, the metal support member 18 has a longitudinal dimension of 966 mm, a short dimension of 573 mm, and double-sided adhesive that is attached to the metal support member 18. The total area of agent 20 is about 490000 mm ² . The glass substrate 14 closer to the metal support member 18 has a thickness of about 3 mm, and the double-sided adhesive 20 has a thickness of about 1 mm. The dimension obtained by adding the thickness of the glass substrate 14 closer to the metal support member 18 and the thickness of the sheet-like double-sided adhesive 20 is about 4 mm. The dimension of the hole 22 is smaller than the area of the circle having a radius of about 4 mm. For example, if the dimension of the hole 22 is equal to the area of a circle having a radius of 3.5 mm, the area of the hole 22 is about 39 mm ² and the total area of the hole 22 is 10% with respect to the total area of the double-sided adhesive 20. In this case, the number of holes 22 is about 1270.

  In order to observe the state of adhesion and fixation between the plasma display panel 16 and the metal support member 18, an experiment in which a single transparent glass 26 having the same strength, rigidity, and flatness as the plasma display panel was applied (FIG. 6). According to FIG. 7 and FIG. 7), the area that realizes complete adhesion between the plasma display panel 16 and the double-sided adhesive 20 is about 30 to 50% with respect to the total area of the plasma display panel. There is uncontrollable air in the part. Therefore, it is effective for extracting the remaining air that the holes 22 are provided at a uniform high density with respect to the entire area of the double-sided adhesive 20.

  On the other hand, the metal support member 18 is often made of an aluminum alloy that is lightweight and inexpensive as well as having excellent thermal characteristics in order to realize a thin and lightweight plasma display device 10 as a whole. In this case, since there is a certain limit in mechanical strength, the limit in increasing the density of the holes 22 must also be considered. From the results of various experiments, if the total area of the hole 22 is within a range of about 10% with respect to the total area of the double-sided adhesive 20, the influence of the temperature change due to the presence or absence of the hole 22 on the heat conduction characteristics It has been confirmed that the temperature does not reach this temperature. Therefore, by limiting the total area occupied by the holes 22 to about 10% or less with respect to the area of the double-sided adhesive 20, the thermal characteristics of the holes 22 provided in the metal support member 18 can substantially reduce the temperature of the display surface. It may be considered that it can be held uniformly. For this reason, it is effective for extracting more residual air that the dimension of the hole 22 provided in the metal support member 18 is smaller than that defined as the maximum value, and the plasma display. This also improves the adhesion between the panel 16 and the metal support member 18. Focusing on actual workability and workability, the size of the hole 22 is reduced as much as possible, and the density of the hole 22 is increased within a range that achieves about 10% or less with respect to the area of the double-sided adhesive 20. Will yield the most desirable results.

  As described above, according to the present invention, air trapped between the plasma display panel and the double-sided adhesive can be removed, and the adhesive force can be dramatically increased. If the bonding area can be increased, the possibility of halving the thickness of the double-sided adhesive having the same adhesive strength as the current situation is increased. If the thickness of the double-sided adhesive is reduced by half, the heat generated by the panel drive can be transmitted to the metal support member evenly, and at the same time, the mechanical deformation is reduced, making it more efficient, lower cost and higher performance. A plasma display apparatus can be provided.

  The embodiment described above includes the following features.

  (Additional remark 1) It consists of a plasma display panel consisting of a pair of glass substrates, a metal support member that supports the plasma display panel, and at least one double-sided adhesive that fixes the plasma display panel and the metal support member to each other. The metal support member has at least one hole, and the double-sided adhesive is inserted from the hole in the metal support member to remove air trapped between the plasma display panel and the double-sided adhesive. A plasma display device characterized by being scratched by a tool.

  (Supplementary note 2) The area of the hole of the metal support member is a circle whose radius is a dimension obtained by adding the thickness of the glass substrate closer to the metal support member of the plasma display panel and the thickness of the double-sided adhesive. 2. The plasma display device according to appendix 1, wherein the plasma display device is smaller than an area.

  (Additional remark 3) The area of the hole of this metal supporting member is 10% or less of the area of this double-sided adhesive agent, The plasma display apparatus of Additional remark 2 characterized by the above-mentioned.

  (Additional remark 4) The plasma display apparatus of Additional remark 1 characterized by the hole of this metal supporting member being arrange | positioned with sufficient balance on both sides of the centerline of the dimension of the transversal direction of this double-sided adhesive.

  (Supplementary Note 5) The at least one double-sided adhesive is composed of a plurality of double-sided adhesives arranged in parallel at intervals, and the interval between two holes located on the outer periphery of two adjacent double-sided adhesives is each 2. The plasma display device according to appendix 1, wherein the plasma display device is larger than a distance between two holes in the double-sided adhesive.

(Additional remark 6) At least 1 which is arrange | positioned between the plasma display panel which consists of a pair of glass substrate, the metal support member which supports this plasma display panel, and this plasma display panel and this metal support member mutually fixes A method of manufacturing a plasma display device comprising two double-sided adhesives,
Providing at least one hole in the metal support member;
At least one double-sided adhesive is applied to the metal support member,
A side opposite to the side where the metal supporting member is pasted of the double-sided adhesive is pasted to the plasma display panel,
A manufacturing method comprising: inserting a tool through a hole of the metal support member to scratch the double-sided adhesive; and removing air trapped between the plasma display panel and the double-sided adhesive through the scratch .

  (Supplementary note 7) The air trapped between the plasma display panel and the double-sided adhesive is extracted through the hole of the metal support member and the damaged part of the double-sided adhesive. Production method.

  (Supplementary Note 8) A vacuum pad is used to extract air trapped between the plasma display panel and the double-sided adhesive, and a tool for scratching the double-sided adhesive is movably incorporated in the vacuum pad. The manufacturing method according to appendix 7, characterized in that:

  (Supplementary note 9) The manufacturing method according to supplementary note 6, wherein when the double-sided adhesive is scratched, a tool for scratching the double-sided adhesive is pierced into the double-sided adhesive by a limited distance.

  (Additional remark 10) The manufacturing method of Additional remark 6 characterized by inserting the tool which damages this double-sided adhesive agent into this double-sided adhesive agent with the pressing force of an elastic member.

  As described above, according to the present invention, the plasma display panel is securely fixed to the metal support member by the double-sided adhesive, and the heat generated by the plasma display panel is released to the metal support member via the double-sided adhesive. A plasma display apparatus can be provided.

FIG. 1 is a schematic cross-sectional view showing a plasma display device according to the present invention. FIG. 2 is a schematic exploded perspective view of the plasma display apparatus of FIG. FIG. 3 is a diagram showing a process of applying a double-sided adhesive to the metal support member. FIG. 4 is a diagram showing a process of attaching the opposite side of the double-sided adhesive on which the metal support member is attached to the plasma display panel. FIG. 5 is a diagram showing an example in which air is trapped between the plasma display panel and the double-sided adhesive. FIG. 6 is a schematic cross-sectional view showing a pseudo plasma display device for an experiment using one transparent glass instead of the plasma display panel. FIG. 7 is a plan view showing the pseudo plasma display apparatus of FIG. FIG. 8 shows a double-sided adhesive wound with a blade-like tool to remove air trapped between the plasma display panel and the double-sided adhesive after the bonding process of the double-sided adhesive and the plasma display panel of FIG. It is a figure which shows the process of attaching. FIG. 9 is a diagram showing a step of sucking and removing air with a vacuum pad after the step of scratching the double-sided adhesive of FIG. FIG. 10 is a side view showing the blade-like tool used in FIG. FIG. 11 is a cross-sectional view showing the blade-like tool of FIG. FIG. 12 is a schematic diagram showing an example of the tip shape of a blade-like tool. FIG. 13 is a cross-sectional view showing a metal support member. FIG. 14 is a plan view showing the metal support member of FIG. FIG. 15 is a cross-sectional view showing a pseudo plasma display device including the metal support member of FIGS. 13 and 14. 16 is a plan view showing the pseudo plasma display device of FIG. FIG. 17 is a diagram showing a process of removing air with an air removing device including a blade-like tool and a vacuum pad. FIG. 18 is a diagram illustrating a process of removing air with an air removing device including a blade-like tool and a pressure reducing pad.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plasma display apparatus 12 Glass substrate 14 Glass substrate 16 Plasma display panel 18 Metal support member 20 Double-sided adhesive 22 Hole 24 Air 26 Glass 28 Cutlery tool 30 Decompression pad

Claims (10)

  A plasma display panel composed of a pair of glass substrates, a metal support member that supports the plasma display panel, and at least one double-sided adhesive that fixes the plasma display panel and the metal support member to each other. The member has at least one hole, and the double-sided adhesive is applied by a tool inserted through the hole in the metal support member to remove air trapped between the plasma display panel and the double-sided adhesive. A plasma display device characterized by having scratches.   The area of the hole of the metal support member is smaller than the area of a circle whose radius is a dimension obtained by adding the thickness of the glass substrate closer to the metal support member of the plasma display panel and the thickness of the double-sided adhesive. The plasma display device according to claim 1.   The plasma display device according to claim 2, wherein the area of the hole of the metal support member is 10% or less of the area of the double-sided adhesive.   2. The plasma display device according to claim 1, wherein the holes of the metal support member are arranged in a balanced manner on both sides of the center line of the short dimension of the double-sided adhesive.   The at least one double-sided adhesive is composed of a plurality of double-sided adhesives arranged in parallel at intervals, and the distance between two holes located on the outer periphery of each of the two adjacent double-sided adhesives The plasma display apparatus according to claim 1, wherein the distance is larger than a distance between two holes in the plasma display apparatus. A plasma display panel comprising a pair of glass substrates, a metal support member that supports the plasma display panel, and at least one double-sided adhesive that is disposed between the plasma display panel and the metal support member and fixes them together A plasma display device manufacturing method comprising:
Providing at least one hole in the metal support member;
At least one double-sided adhesive is applied to the metal support member,
A side opposite to the side where the metal supporting member is pasted of the double-sided adhesive is pasted to the plasma display panel,
A manufacturing method comprising: inserting a tool through a hole of the metal support member to scratch the double-sided adhesive; and removing air trapped between the plasma display panel and the double-sided adhesive through the scratch .   7. The manufacturing method according to claim 6, wherein air trapped between the plasma display panel and the double-sided adhesive is extracted through a hole in the metal support member and a damaged portion of the double-sided adhesive.   A vacuum pad is used to extract air trapped between the plasma display panel and the double-sided adhesive, and a tool for scratching the double-sided adhesive is movably incorporated in the vacuum pad. The manufacturing method according to claim 7.   The manufacturing method according to claim 6, wherein when the double-sided adhesive is scratched, a tool for scratching the double-sided adhesive is pierced into the double-sided adhesive by a limited distance.   The manufacturing method according to claim 6, wherein a tool for scratching the double-sided adhesive is pierced into the double-sided adhesive by a pressing force of an elastic member.

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