JP2010039112A - Display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large-screen large-sized display which is speedily disassembled to such form that a component member is recycled. <P>SOLUTION: The display includes a display panel 10 configured by oppositely arranging a pair of glass substrates, and a metal member 44 joined to the display panel 10 through a joining member 36. The joining member 36 includes a sticky member 39 and a foaming member 50, and at least one of density, particle diameter and material of the foaming member 50 arranged in the joining member 36 is made to differ between a periphery area and an image display area of the display panel 10. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device that can easily separate a display panel and a metal member in a display device including a metal member such as a chassis member on the back surface of the display panel.

  In recent years, a liquid crystal display device using a liquid crystal display panel and a plasma display device using a plasma display panel (hereinafter abbreviated as PDP) are attracting attention as a display device suitable for thin and large size, and is produced and sold in large quantities. It is expanding rapidly.

  The PDP is composed of a pair of glass substrates, a front plate and a back plate. In the front plate, a display electrode pair, a dielectric layer, a protective layer, and the like are formed on a front glass substrate. On the other hand, on the back plate, data electrodes, barrier ribs, phosphor layers and the like are formed on a back glass substrate. Oppositely arranged so that a minute discharge space is formed between the front plate and the back plate, the peripheral portions of the front glass substrate and the back glass substrate are sealed by a sealing member. The discharge space is filled with a discharge gas formed by mixing neon (Ne), xenon (Xe), and the like.

  A metal member as a chassis member is attached to the back surface of the back plate of the PDP via a bonding member such as an adhesive heat conductive sheet or an adhesive. The metal member is a substrate for mounting a circuit board on which a drive circuit for driving the PDP is mounted, and also has a function of efficiently radiating heat generated in the PDP. Further, the plasma display device is provided with a front frame and a back cover for protecting the PDP and the circuit board.

  With the mass spread of plasma display devices, the number of collected plasma display devices is expected to increase dramatically, and further, the number of recovered plasma display devices due to process defects during production is expected to increase. In this situation, from the viewpoint of environmental problems and resource saving, it is an important issue to disassemble various members and materials of the plasma display device into a form that can be reused at low cost. In order to disassemble the plasma display device in a reusable form, it is necessary to separate it into a PDP mainly made of a glass substrate, a metal member as a chassis member, and a circuit board.

On the other hand, as a method for separating the glass substrate and the metal member of the PDP, conventionally, a method of reducing the adhesive force of the joining member by heating the glass substrate or the metal member (for example, Patent Document 1, 2) and a method of separating the joining member by physical means (for example, see Patent Documents 3 and 4).
JP 2004-111092 A JP 2005-116346 A JP-A-2005-208278 JP 2005-129318 A

  The conventional method of disassembling by simply lowering the adhesive force of the joining member by heating the display device is accompanied by an increase in the heat capacity of the display device as the display device such as a plasma display device becomes larger and larger. This requires a long time and requires a large peeling force for peeling between the PDP and the metal member, resulting in an increase in man-hours and a reduction in efficiency.

  The method of separating the joints by physical means makes the device for separation large, and it becomes difficult to apply physical measures uniformly over the entire surface of the large display device, destroying the display device. Issues such as problems in material recovery have occurred.

  In particular, in order to effectively reuse the glass substrate constituting the display device, it is important to separate and disassemble the metal member and the display panel in a state where there is no breakage such as cracking of the glass substrate.

  In order to solve these problems, an object of the present invention is to provide a display device capable of disassembling a large-screen, large-sized display device into a form in which components can be reused.

  In order to achieve the above-described object, a display device of the present invention is a display device including a display panel in which a pair of glass substrates are arranged to face each other, and a metal member joined to the display panel via a joining member. The joining member is composed of an adhesive member and a foam member, and at least one of the concentration, particle diameter, and material of the foam member disposed in the joining member is made different between the peripheral area of the display panel and the image display area. .

  With such a configuration, it is possible to dismantle the display device by foaming the foaming member disposed on the joining member to weaken the joining force between the display panel and the joining member or between the joining member and the metal member. At this time, the density, particle diameter, and material of the foamed member are made different between the peripheral region and the image display region of the display device, and a weak peeling force is applied to the region where the bonding force is reduced to display the display panel over the entire surface of the display device. It is possible to realize a display device that can be easily separated from the metal member.

  Furthermore, it is desirable that the peripheral region is a region from the outermost end portion of the surface where the bonding member is bonded to the sealing member which seal-bonds the pair of glass substrates.

  According to such a configuration, the bonding force due to foaming of the foam member can be made different between the peripheral area and the image display area, and the display is applied by applying a peeling force from the outside to the area where the bonding force is weakened. There is no need to apply a peeling force to the entire surface of the apparatus. In particular, when the peeling force is applied outside the highly rigid region joined by the sealing member, it is possible to easily apply the peeling force with less occurrence of the glass substrate in the image display region.

  Further, it is desirable that the density of the foam member in the peripheral area is larger than the density of the foam member in the image display area.

  According to such a configuration, even in the case of the foam member having the same particle diameter and the same material, the total foam volume by the foam member is increased in the peripheral region having a high concentration arranged in the joining member. The joining force between the joining member or the joining member and the metal member can be further weakened. Therefore, a separation force can be easily applied between the display panel and the metal member at the outer peripheral edge of the display device, and the separation force can be transmitted to the entire surface of the display device to achieve separation and disassembly without breaking the glass substrate. be able to.

  Furthermore, it is desirable that the particle diameter of the foam member in the peripheral area is larger than the particle diameter of the foam member in the image display area.

  According to such a configuration, even in the case of foam members having the same arrangement concentration and the same material, the total volume of foam by the foam member is increased in the peripheral region having a large particle diameter disposed in the joining member. And the joining force of the joining member or the joining member and the metal member can be further weakened.

  Further, the foam member in the peripheral area may be made of a material having a larger expansion ratio than the foam member in the image display area.

  According to such a configuration, even in the foam member having the same arrangement concentration and the same particle diameter, the total foam volume by the foam member is increased in the peripheral region having a large expansion ratio arranged in the joining member. The joining force between the panel and the joining member or between the joining member and the metal member can be further weakened.

  As described above, according to the display device of the present invention, it is possible to disassemble a large-screen, large-sized display device into a form in which constituent members can be reused.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the embodiment of the present invention, a plasma display device will be described as an example of a display device.

(Embodiment 1)
FIG. 1 is an exploded perspective view showing a basic configuration of PDP 10 used in a plasma display device as a display device according to Embodiment 1 of the present invention. The PDP 10 includes a front plate 20 and a back plate 30. The front plate 20 has a front glass substrate 21, and a plurality of display electrode pairs 24 including scan electrodes 22 and sustain electrodes 23 arranged in parallel are formed on the front glass substrate 21. A dielectric layer 25 is formed so as to cover the scan electrode 22 and the sustain electrode 23, and a protective layer 26 is formed on the dielectric layer 25.

  The back plate 30 has a back glass substrate 31. A plurality of data electrodes 32 arranged in parallel are formed on the back glass substrate 31, and a base dielectric layer 33 is formed so as to cover the data electrodes 32. A cross-girder-shaped partition wall 34 is formed thereon. On the side surface of the partition wall 34 and the underlying dielectric layer 33, a phosphor layer 35 that emits light in red, green, and blue colors is provided for each data electrode 32 sequentially.

  The front plate 20 and the back plate 30 are arranged to face each other so that the display electrode pair 24 and the data electrode 32 intersect each other with a minute discharge space interposed therebetween, and the outer periphery thereof is sealed with a sealing member such as a glass frit. Has been. For example, a mixed gas such as neon (Ne) or xenon (Xe) is sealed in the discharge space as a discharge gas. Further, the discharge space is divided into a plurality of sections by the partition walls 34, and discharge cells are formed at the intersections between the display electrode pairs 24 and the data electrodes 32. Then, discharge is performed in these discharge cells, and the phosphor layer 35 is excited by ultraviolet rays generated by the discharge to emit light, and a color image is displayed. Note that the structure of the PDP 10 is not limited to that described above, and for example, a structure having stripe-shaped partition walls may be used.

  FIG. 2 is an exploded perspective view showing the main configuration of plasma display device 40 in accordance with the first exemplary embodiment of the present invention. The plasma display device 40 is made of, for example, a front frame 41, a back cover 42, and a front cover 43 such as glass, which are disposed in the opening of the front frame 41, aluminum (Al), etc. A metal member 44 serving as a chassis member that also serves as a heat dissipation plate, a circuit board 45 constituting a circuit block for driving the PDP 10, and a metal member for transferring heat generated from the PDP 10 to the metal member 44 44, and the like. The joining member 36 is a sheet material including an adhesive member and a foamed member, and has adhesiveness or fusibility. The sheet-like joining member 36 is joined to almost the entire surface of the back plate 30 of the PDP 10 and is also joined to almost the entire surface of the metal member 44.

  The front cover 43 serves as an optical filter and protects the PDP 10, and is subjected to, for example, silver (Ag) vapor deposition in order to suppress unnecessary radiation of electromagnetic waves. The back cover 42 is provided with a plurality of vent holes 42a for releasing heat generated in the PDP 10 and the circuit board 45 to the outside. The circuit board 45 is attached to the back side of the metal member 44 and includes an electric circuit for driving and controlling the PDP 10. An electrode lead-out part (not shown) drawn to the edge of the PDP 10 and a plurality of circuit boards 45 are provided. And a flexible wiring board (not shown). Further, the back cover 42 and the circuit board 45 are fixed to a fixture 48 such as a fixing pin provided on an attachment surface 47 opposite to the surface to which the joining member 36 of the metal member 44 is adhesively joined.

  FIG. 3 is a cross-sectional view showing a structure of the PDP unit 38 used in the plasma display device 40 according to the first embodiment of the present invention. The PDP unit 38 is separated from the plasma display device 40 shown in FIG. The front cover 43 and the back cover 42 are removed. 3A is a longitudinal cross-sectional view of the PDP 10 of the PDP unit 38, and FIG. 3B is a cross-sectional view showing details of a portion A of FIG. 3A.

  The front plate 20 and the back plate 30 constituting the PDP 10 each have a thickness of 1 mm to 3 mm including the front glass substrate 21 and the back glass substrate 31, and the outer peripheral portions of the front plate 20 and the back plate 30 are sealing members. 37 is sealed and joined. Further, a bonding member 36 having adhesiveness is disposed between the back surface side of the back plate 30 and the metal member 44 so that the metal member 44 and the PDP 10 are bonded. Further, a circuit board 45 is fixed to the metal member 44 by a fixture 48 on the surface opposite to the surface where the bonding member 36 is bonded. The joining member 36 dissipates the heat generated in the PDP 10 to the metal member 44, suppresses the temperature increase of the entire PDP 10 and suppresses the local temperature increase, the cracks in the front glass substrate 21 and the rear glass substrate 31, and the image display image quality. It also plays a role in suppressing the decline.

  The joining member 36 according to the first embodiment of the present invention is a sheet having a thickness of about 1.2 mm, and a metal-based flame retardant is formed on a base material mainly composed of an adhesive acrylic copolymer. The adhesive member 39 kneaded with foamed urethane and the foamed member 50 are used. The adhesive member 39 has adhesiveness and adhesively bonds the back glass substrate 31 of the back plate 30 and the metal member 44. The foaming member 50 is a microcapsule having an average particle diameter of 20 μm to 40 μm in which liquid low-boiling hydrocarbons are encapsulated in a thermoplastic polymer shell. In the first embodiment of the present invention, Dispersed and arranged at the interface between the adhesive member 39 and the back plate 30.

  FIG. 4 is a schematic diagram showing the thermal expansion characteristics of the microcapsule that is the foamed member 50, and shows a state in which the outer diameter changes due to heating. When heated from the room temperature state of FIG. 4A to about 160 ° C. shown in FIG. 4B, the hydrocarbon 54 contained in the foamed member 50 expands and the high thermoplasticity constituting the shell 55 is expanded. Molecules also soften and expand rapidly. At this time, the foamed member 50 is stabilized at a diameter in which the internal pressure of the hydrocarbon 54 and the tension and external pressure of the polymer shell 55 are balanced. When further heated to 200 ° C. as shown in FIG. 4C, the hydrocarbon 54 gas leaks through the thinned shell 55 and contracts due to the external pressure.

  As the microcapsules as the foaming member 50, those having various temperature characteristics, those having various particle diameters, and those having various expansion coefficients can be considered. For example, the medium temperature type is 120 ° C. to 140 ° C., the high temperature type is 160 ° C. to 190 ° C., the expansion coefficient, that is, the expansion ratio is maximized, and the particle diameter is increased 5 to 10 times by foaming.

  In general, even with the joining member 36 made of only the adhesive member 39 such as a normal acrylic copolymer to which the foaming member 50 is not added, the joining force is lowered when heated at a temperature of 200 ° C. or more for several tens of minutes. However, in order to speedily separate the large-area PDP 10 and the metal member 44 in a reusable form, it is necessary to apply a strong peeling force controlled with heating between the PDP 10 and the metal member 44. The front glass substrate 21 and the rear glass substrate 31 constituting the PDP 10 have a large area and a thin plate thickness of 1 mm to 3 mm. Therefore, when an excessive load is applied in these separation and peeling processes, the glass substrate is cracked or cracked. The glass substrate in which cracks or cracks are generated hinders the productivity of subsequent separation and dismantling processes. In addition, a large-scale facility is required to apply a largely controlled peeling force.

  FIG. 5 is a plan view of the PDP unit 38 according to the first embodiment of the present invention as viewed from the back plate 30 side. 6 is a cross-sectional view of each of the joining members 36 in the peripheral areas P and R and the image display area Q in FIG. Although the joining member 36 is not shown in FIG. 5, the joining member 36 is joined to the entire surface of the back plate 30.

  As shown in FIG. 6, in the display device according to Embodiment 1 of the present invention, the foam members 50 are dispersedly arranged at the interface between the adhesive member 39 and the back plate 30. That is, the entire joining member 36 has a sheet shape of about 1.2 mm, and has a configuration in which the foamed members 50 are distributed on the surface of the acrylic copolymer adhesive member 39. Such a configuration can be realized by arranging the foamed member 50 on the surface of the adhesive member 39 molded into a sheet shape by a method such as printing or spraying.

  In the first embodiment of the present invention, as shown in FIG. 6, the foam members 50 distributed on the adhesive member 39 in the peripheral areas P and R of the PDP 10 and the image display area Q shown in FIG. The concentration is different. Here, the peripheral area of the PDP 10 means that the front glass substrate 21 and the rear glass substrate 31 are sealed and joined from the outermost end B of the rear glass substrate 31 surface to which the joining member 36 of the PDP 10 shown in FIG. 5 is joined. This is the entire region up to the sealing member 37 to be performed. Further, the image display area is the entire area inside the sealing member 37 and displaying an image by the PDP 10. 5 and 6, the P point and the R point are shown as representatives as the peripheral area, and the Q point is shown as a representative as the image display area.

  6A shows the state of the joining member 36 at the peripheral region P point, FIG. 6B shows the state of the joining member 36 at the same R point, and FIG. 6C shows the joining at the image display region Q point. The state of the member 36 is shown. As shown in FIG. 6, the peripheral regions P and R of the PDP 10 are dispersed and arranged at a high concentration so that the number per unit area of the microcapsules that are the foamed members 50 is larger than the image display region Q.

  That is, in Embodiment 1 of the present invention, the foam member 50 is the same particle diameter and the same material as the foam member 50 at room temperature, and the concentration of the dispersed arrangement in the peripheral region is determined from the dispersed arrangement concentration of the image display region. It is also bigger. For example, the foaming member 50 in the peripheral region has a bonding force at the interface between the back plate 30 and the adhesive member 39 after foaming of the foaming member 50 is 1: 3 in the peripheral region and the image display region. The number per unit area is 2 to 3 times that of the image display area.

When the concentration of the foamed member 50 to the joining member 36 is increased, the adhesive force of the joining member 36 is reduced because the ratio of the adhesive member 39 that secures the joining force is reduced. The arrangement concentration of the foamed member 50 is set so that a bonding force of 50 N / cm ² or more can be secured in the region. If the bonding force is 50 N / cm ² or more, it has been confirmed that the plasma display device 40 can secure the bonding force and heat dissipation effect between the PDP 10 and the metal member 44 and can display an image without deterioration in image quality. Therefore, in the peripheral region in the normal temperature state, the bonding force is slightly reduced because the density of the foamed member 50 is higher than that in the image display region.

  Next, a method for disassembling and separating the plasma display device 40 which is the display device according to the first embodiment of the present invention will be described. Among such plasma display devices 40, a method for separating and disassembling when the used plasma display device 40 that has reached the end of its product life is collected, and various members and materials are reused or sorted and discarded is concrete. Explained.

  FIG. 7 is a flowchart showing a method for disassembling plasma display device 40 in accordance with the first exemplary embodiment of the present invention.

  As shown in FIG. 7, first, in step S <b> 1, the front frame 41 and the back cover 42 are removed from the plasma display device 40 and disassembled into the PDP unit 38. Next, in step S2, the metal member 44 to which the circuit board 45 is fixed by the fixture 48 is separated from the PDP 10 joined to the metal member 44 by the joining member 36, and the PDP 10 and the metal member 44 with the circuit board 45 are separated from each other. To separate.

  Next, in step S <b> 3, the PDP 10 is separated into the front plate 20 and the back plate 30. Thereafter, components such as electrodes and dielectric layers formed on the front glass substrate 21 and the back glass substrate 31 are removed, and the glass substrates are recovered and re-dissolved for use. . On the other hand, in step S4, the metal member 44 and the circuit board 45 are separated. In this way, the plasma display device 40 is separated and disassembled into a glass substrate or other parts, and reused or regenerated.

  In FIG. 7, step S4 for separating the circuit board 45 and the metal member 44 has been described as a subsequent process of step S2 for separating the metal member 44 and the PDP 10. However, step S4 is performed after step S1. Then, step S2 may be used.

  The display device and the disassembly method thereof according to Embodiment 1 of the present invention have technical characteristics in the method of separating and disassembling the PDP 10 and the metal member 44 from the PDP unit 38 in step S2.

  That is, the PDP unit 38 of the display device according to the first exemplary embodiment of the present invention disperses and arranges the foam members 50 at the interface between the back plate 30 and the adhesive member 39 of the joining member 36, and the dispersion concentration of the foam members 50 is changed to the periphery. The partial area and the image display area are different.

  Step S2 includes a heating and foaming step S21 in which the foaming member 50 is expanded and foamed by heating the joining member 36 joining the metal member 44 and the PDP 10. As a heating method, a method of immersing the PDP unit 38 in a heated heat medium, a method of arranging the PDP unit 38 in a heating atmosphere, or the like can be applied.

  When the foaming member 50 in the joining member 36 is heated to a temperature at which the expansion coefficient is maximized as shown in FIG. 4, the microcapsules that are the foaming member 50 expand to 5 to 10 times the particle diameter at room temperature. The particle diameter becomes.

  FIG. 8 is a cross-sectional view showing the state of the joining member 36 when the PDP unit 38 of the plasma display device 40 according to Embodiment 1 of the present invention is separated into the PDP 10 and the metal member 44. FIG. FIG. 8B shows a state before and after heating in the image display region.

  As shown in FIG. 8, in the first embodiment of the present invention, the dispersion concentration of the foam member 50 in the joining member 36 in the peripheral region is higher than the dispersion concentration of the foam member 50 in the image display region. In Embodiment 1 of the present invention, the foamed member 50 having an average particle diameter of 20 μm to 30 μm and heated to 180 ° C. to expand the particle diameter to 200 μm to 300 μm and having a foaming ratio of about 10 times is used. ing.

  As the temperature rises due to heating, the foam member 50 at the interface between the rear glass substrate 31 and the adhesive member 39 expands to widen the gap G0 between the rear glass substrate 31 and the metal member 44 at room temperature, and the rear surface of the adhesive member 39. While reducing the bonding area with the glass substrate 31, it acts so that the back glass substrate 31 and the adhesion member 39 may be peeled off.

  At this time, the adhesive area between the back glass substrate 31 and the adhesive member 39 when the foaming member 50 expands increases the density of the foaming member 50 to 2 to 3 times in the peripheral region, so that the image display region As shown in FIG. Further, the gap G1 between the PDP 10 and the metal member 44 when the foam member 50 expands is substantially the same in the peripheral area and the image display area. In the peripheral region, the adhesive member 39 is pushed out of the PDP 10 by the expansion of the foam member 50.

  As a result, the bonding force in the peripheral area can be significantly reduced than the bonding force in the image display area.

  By selecting the particle diameter and material of the foam member 50, it is basically possible to separate the PDP 10 and the metal member 44 only by foaming the foam member 50. However, in the first embodiment of the present invention, the dispersed arrangement concentration of the foamed member 50 is determined from the viewpoint of heat dissipation characteristics as the joining member 36, and the peeling force is applied to the final separation and disassembly. That is, the peeling force application step S22 of FIG. 7 is added.

  In the peeling force application step S22, for example, a wedge or the like is inserted into the gap G1 in which the peripheral edge region where the bonding force is weakened is widened to apply the peeling force. As a result, the peeling force can be propagated to the image display region having a stronger bonding force than the peripheral region, and the metal member 44 and the PDP 10 are not easily broken across the entire surface of the PDP 10 by applying a small peeling force. Can be separated and dismantled in a state.

  At this time, in Embodiment 1 of the present invention, the peripheral region is the region from the outermost end B of the surface to which the joining member 36 is joined to the sealing member 37. Therefore, it is possible to apply a peeling force in the vicinity of a highly rigid region joined by the sealing member 37, and the load on the glass substrate in the image display region can be reduced, so that the peeling force can be applied without causing the glass substrate to break. It can be performed.

(Embodiment 2)
In Embodiment 1 of the present invention, the concentration of the dispersed arrangement of the foamed members 50, that is, the number of foamed members 50 per unit area, is different between the peripheral region and the image display region. In the second embodiment of the present invention, the initial particle diameter of the foam member 50 is made different in each region.

  Since the basic configuration of the plasma display device, which is the display device according to the second embodiment of the present invention, is the same as that of the first embodiment, detailed description thereof is omitted.

  FIG. 9 is a cross-sectional view of each of the joining members 36 in the peripheral area P, R and the image display area Q shown in FIG. 5 of the first embodiment in the PDP unit 38 in the second embodiment of the present invention. As shown in FIG. 9, the foam member 51 shown in FIGS. 9A and 9B, which is the peripheral region, and the foam member 52 shown in FIG. 9C, which is the image display region, are made of the same material. The particle diameter is different, and the particle diameter of the foaming member 51 is made larger than the particle diameter of the foaming member 52.

  For example, an average particle diameter of 20 μm to 30 μm is used as the foaming member 52 in the image display area, and an average particle diameter of 35 μm to 45 μm is used as the foaming member 51 in the peripheral area. In this case, if the expansion ratio after heating both is 10 times, the gap in the peripheral area generated by the foaming between the PDP 10 and the metal member 44 may be 1.6 times the gap in the image display area. it can.

  At this time, the concentration of the dispersed arrangement of the foam member 51 and the foam member 52 may be approximately the same, but the concentration of the peripheral region may be further reduced in consideration of the small area of the peripheral region. .

  As in the first embodiment, the foaming members 51 and 52 are expanded and foamed by heating the joining member 36 joining the metal member 44 and the PDP 10 in step S21 shown in FIG. As a heating method, a method of immersing the PDP unit 38 in a heated heat medium, a method of arranging the PDP unit 38 in a heating atmosphere, or the like can be applied.

  When the foaming members 51 and 52 in the joining member 36 are heated to a temperature at which the expansion coefficient is maximized as shown in FIG. 4, the microcapsules that are the foaming members 51 and 52 expand to have a particle size of 5 at room temperature. The particle size is 10 to 10 times. That is, in the peripheral areas P and Q, the foam member 51 expands to a maximum of about 400 μm to widen the interval between the joining members 36, and in the image display area, the foam member 52 expands to a maximum of about 300 μm. The space | interval 36 of this joining member is expanded.

  As a result, the back glass substrate 31 and the adhesive member 39 act so as to be peeled off, and the adhesion area between the back glass substrate 31 and the adhesive member 39 is significantly reduced in the peripheral area as compared with the image display area. Therefore, in the peripheral area, the bonding force between the PDP 10 and the metal member 44 can be weaker than the image area.

  Thereafter, as in the first embodiment, in the peeling force application step S22, for example, a wedge or the like is inserted into the peripheral area where the bonding force has become weak, and the peeling force is applied. As a result, the peeling force can be propagated to the image display area having a stronger bonding force than the peripheral area, and the metal member 44 and the PDP 10 are not easily broken across the entire surface of the PDP 10 with a small peeling force. Can be separated and disassembled.

  In the first embodiment and the second embodiment, the foam members 50, 51, 52 are dispersedly arranged at the interface between the bonding member 36 and the rear glass substrate 31. The foam members 50, 51, 52 may be dispersedly arranged at the interface.

(Embodiment 3)
In the third embodiment of the present invention, the foam members 53 are dispersedly arranged in the adhesive member 39 of the joining member 36, and the density of the dispersed arrangement is determined by using the foam members 53 having the same particle diameter. And different. Further, the basic configuration of the plasma display device, which is the display device according to the third embodiment of the present invention, is the same as that of the first and second embodiments, and thus detailed description thereof is omitted.

  FIG. 10 is a cross-sectional view showing a state of the joining member 36 when the PDP unit 38 of the plasma display device according to the third embodiment of the present invention is separated into the PDP 10 and the metal member 44. FIG. FIG. 10B shows a state before and after heating in the peripheral area, and FIG. 10B shows a state before and after heating in the image display area.

  As shown in FIG. 10, the foam members 53 are dispersedly arranged inside the adhesive member 39 of the joining member 36. As a method of dispersing and arranging the microcapsules to be the foaming member 53 in the adhesive member 39, when the adhesive member 39 is molded into a sheet shape, the foaming member 53 is mixed and kneaded in the base material, and these are sheeted. It may be molded into a shape.

  Furthermore, in the third embodiment of the present invention, the dispersion concentration of the foam member 53 in the joining member 36 in the peripheral region is higher than the dispersion concentration of the foam member 53 in the image display region.

  For example, in Embodiment 3 of the present invention, when the foamed member 53 is foamed with an average particle diameter of 20 μm to 30 μm as the foamed member 53, the foamed member 53 after foaming is the thickness of the bonding member 36 in the peripheral region. The density is set to be about 2 to 3 times the density of the foam member dispersedly arranged in the image display area so as to interfere with the direction.

  As the temperature rises due to heating, the foam member 53 expands, the volume of the foam member 53 in the joining member 36 increases, and the gap G0 between the back glass substrate 31 and the metal member 44 at the room temperature increases. At this time, since the concentration of the foamed member 53 is increased 2 to 3 times in the peripheral region, when the foamed member 53 expands, the foamed members 53 interfere with each other, and the PDP 10 and the metal member 44 It acts to make the gap G1 larger. As a result, peeling of the adhesive member 39 from the surface of the back glass substrate 31 or the surface of the metal member 44, cracking of the adhesive member 39, etc. can occur and the bonding force can be greatly reduced.

  On the other hand, in the image display region, since the density of the foam member 53 is low, the foam members 53 do not interfere with each other during expansion, but the foam member 53 forms a gap G2 larger than the gap G0 due to the expansion. In this way, the adhesive member 39 is partially peeled or cracked to reduce the bonding force.

  Therefore, the respective gaps before and after heating are G0 <G2 <G1. As a result, the bonding force in the peripheral area can be made lower than the bonding force in the image display area.

  In this way, the peeling force is applied by inserting, for example, a wedge into the peripheral region where the bonding force is weak and the gap is large. As a result, the peeling force can be propagated to the image display area having a stronger bonding force than the peripheral area, and the metal member 44 and the PDP 10 are not easily broken across the entire surface of the PDP 10 with a small peeling force. Can be separated and disassembled.

  In the third embodiment, the case where the foamed members dispersedly arranged in the peripheral area and the image display area are made of the same material and the same particle diameter and the dispersed arrangement concentration is different has been described. However, the present invention is not limited to the above embodiment, and for example, the material of the hydrocarbon constituting the foaming member 53 and the material of the thermoplastic polymer constituting the shell 55 are made of a material having a large foaming ratio in the peripheral area, and the image display area Then, it is good also as a material with small small expansion ratio. For example, when an acrylic copolymer is used as the material of the shell 55 for the foam member 53 in the peripheral region, and a VCl2-acrylic copolymer is used as the material of the shell 55 for the foam member 53 in the image display region, the foam member 53 in the peripheral region. The expansion ratio can be set to about twice the expansion ratio of the foam member 53 in the image display area, and the same effect can be exhibited.

  In order to obtain the same effect, the concentration of the dispersed arrangement and the expansion ratio are the same, but the particle diameter of the foam member 53 in the peripheral area may be larger than the particle diameter in the image display area.

  In any case, in Embodiment 3 of the present invention, the foaming members 53 are dispersedly arranged in the adhesive member 39, and the gap between the joining members 36 is expanded by foaming of the foaming member 53. The bonding area with the substrate 31 and the metal member 44 is reduced to reduce the bonding force.

  In the first embodiment and the second embodiment, the case where the foam members 50, 51, 52 are arranged at the interface between the adhesive member 39 and the back glass substrate 31 or the metal member 44 has been described. On the other hand, in the third embodiment, the case where the foam members 53 are dispersedly arranged inside the sheet of the adhesive member 39 has been described.

  However, as is clear from the above description, the foam member 53 is dispersedly arranged inside the adhesive member 39 as described in the third embodiment to form the adhesive member 39. It is also possible to dispose foam members 50, 51, 52 at the interface with the rear glass substrate 31 or the metal member 44.

  Even in this case, the same effect as in the first, second, and third embodiments can be obtained by making the concentration, the particle diameter, or the material of the foamed member different between the peripheral region and the image display region.

  Furthermore, in the above description, the foam member is dispersedly disposed in the joining member in both the peripheral region and the image display region. However, the same effect can be obtained by disposing the foam member only in the peripheral region. It is also possible to make it.

  In the above description, the case where the bonding force in the peripheral region of the display device is weaker than the bonding force in the image display region due to foaming of the foaming member has been described. However, contrary to the above, the bonding force in the image display area is weaker than the bonding force in the peripheral area. For example, the peripheral area is pulled by peeling off the image display area of the PDP or metal member while sucking it. The peeled PDP and the metal member can be separated and disassembled without breaking the glass substrate. That is, the present invention applies a weak peeling force to a region where the bonding force is partially weakened, and propagates the peeling force to the entire surface to enable separation and disassembly without breaking the glass substrate with the weak peeling force. It is.

  In the above description, the case where an acrylic copolymer is used as the adhesive member has been described, but a urethane-based or silicone-based polymer can also be used.

  As described above, according to the display device in the embodiment of the present invention, when the display panel and the metal member are separated from each other, even if the display device has a large screen, the glass substrate is destroyed only by applying a small peeling force. Separation is possible without damage. Therefore, in the next step, the front glass substrate and the rear glass substrate are separated from the display panel, and the dismantling operation for separating and collecting the glass substrate and the components formed on the glass substrate from each separated glass substrate. It can be performed with high productivity and high efficiency.

  In the above description, the plasma display device is described as an example of the display device. However, it goes without saying that the present invention can also be applied to a liquid crystal display device, an EL display device, and the like.

  As described above, according to the display device of the present invention, the constituent members constituting the display device can be disassembled and separated with high productivity, and is particularly useful as a large-screen display device.

1 is an exploded perspective view showing a basic configuration of a PDP used in a plasma display device as a display device in Embodiment 1 of the present invention. An exploded perspective view showing the main configuration of the plasma display device Sectional drawing which shows the structure of the PDP unit used for the plasma display apparatus Schematic diagram showing the thermal expansion characteristics of microcapsules that are foam members The top view which looked at the PDP unit in Embodiment 1 of this invention from the backplate side Sectional drawing of each joining member in the peripheral area P, R and the image display area Q in FIG. The flowchart which shows the disassembly method of the plasma display apparatus in Embodiment 1 of this invention. Sectional drawing which shows the state of the joining member at the time of isolate | separating the PDP unit of the plasma display apparatus into PDP and a metal member Sectional drawing of each joining member in the peripheral part area | regions P and R and the image display area Q in the PDP unit in Embodiment 2 of this invention. Sectional drawing which shows the state of the joining member at the time of isolate | separating the PDP unit of the plasma display apparatus in Embodiment 3 of this invention into PDP and a metal member.

Explanation of symbols

10 PDP (Display Panel)
DESCRIPTION OF SYMBOLS 20 Front plate 21 Front glass substrate 22 Scan electrode 23 Sustain electrode 24 Display electrode pair 25 Dielectric layer 26 Protective layer 30 Back plate 31 Back glass substrate 32 Data electrode 33 Base dielectric layer 34 Partition 35 Phosphor layer 36 Bonding member 37 Sealing Adhering member 38 PDP unit 39 Adhesive member 40 Plasma display device 41 Front frame 42 Back cover 42a Vent hole 43 Front cover 44 Metal member 45 Circuit board 47 Mounting surface 48 Attaching tool 50, 51, 52, 53 Foam member 54 Hydrocarbon 55 Shell

Claims (5)

A display device comprising a display panel in which a pair of glass substrates are arranged opposite to each other, and a metal member joined to the display panel via a joining member,
The joining member is composed of an adhesive member and a foam member, and at least one of the concentration, particle diameter, and material of the foam member disposed in the joining member is different between the peripheral area and the image display area of the display panel. A display device characterized by the above. The display device according to claim 1, wherein the peripheral region is a region from an outermost end portion of a surface to which the bonding member is bonded to a sealing member that seal-bonds the pair of glass substrates. . 3. The display device according to claim 1, wherein the density of the foam member in the peripheral area is higher than the density of the foam member in the image display area. The display device according to claim 1, wherein a particle diameter of the foam member in the peripheral area is larger than a particle diameter of the foam member in the image display area. The display device according to claim 1, wherein the foam member in the peripheral area is made of a material having a larger expansion ratio than the foam member in the image display area.

Images