JP2008096568A - Disassembling method of plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily separating a PDP from a chassis without causing breakage and crack in the PDP. <P>SOLUTION: The disassembling method of a plasma display device including a display unit of which the PDP 12 and chassis 16 are stuck to each other via a sheet 17 includes: a process for heating the display unit; a process for setting the heated display unit so that the surface of the PDP 12 is in interfacial contact with metallic fiber of a unit supporting means 28 with a slope 28a where the metallic fiber (metallic sheet 29) is formed; a process for holding an upper end part of the PDP 12 on the unit supporting means 28; and a process for separating the PDP 12 from the chassis 16 by applying force to the chassis 16 so that the upper end part of the chassis 16 is separated from the PDP 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for disassembling a plasma display device.

  A plasma display apparatus is a plasma display panel (PDP) in which a pair of glass substrates on which a plurality of electrodes and the like are formed are arranged so that a discharge space is formed between them and a peripheral part is sealed with a sealing member. And a metal chassis that holds the PDP and an electric circuit that is attached to the chassis and drives the PDP. The display unit is housed in a housing. A sheet having thermal conductivity is provided between the PDP and the chassis, and the PDP and the chassis are bonded and fixed via the sheet.

In addition, recycling of home appliances has been regarded as important from the viewpoint of effective use of resources, and recycling technology of plasma display devices is also being studied. When recycling the plasma display device, it is necessary to separate the PDP unit in which the PDP, the sheet, and the chassis are bonded and integrated into the PDP, the sheet, and the chassis. For example, in Patent Document 1, after a PDP unit is heated in a heating furnace, it is attached to a separation mechanism of a dismantling device, and a plate-like or bar-like separation member having a V-shaped tip is inserted into the joint between the PDP and the chassis. In addition, it is described that the chassis and the PDP are separated by applying a force for separating the chassis from the PDP in conjunction with the insertion of the separating member. Here, in the separation mechanism of the dismantling device, the front panel of the PDP is held on the holding plate by vacuum suction or the like.
JP 2005-129318 A

  However, since the PDP unit heated to a high temperature is thermally deformed due to the influence of uneven temperature distribution or the like, when the separation member having the V-shaped tip is inserted into the joint between the PDP and the chassis, the separation is performed. In some cases, local deformation force acts on the PDP by the member to cause cracks or cracks in the PDP. The separated PDP is further disassembled in a subsequent process, and an electrode formed on the glass substrate is removed by polishing to form a raw glass. When cracks or cracks occur in the PDP, it is difficult to work in the process of making the glass substrate into a raw glass, or the work efficiency is lowered.

  An object of the present invention is to solve the above problems and to provide a method for easily separating a PDP and a chassis without causing cracks or cracks in the PDP.

  In order to achieve the above object, the present invention provides a method for disassembling a plasma display device having a display unit in which a plasma display panel and a chassis are joined via a sheet, a step of heating the display unit, and a metal fiber Setting the heated display unit so that the surface of the plasma display panel is in contact with the metal fiber on the unit support means having an inclined surface formed with the upper surface of the plasma display panel and the unit support means And a step of separating the chassis and the plasma display panel by applying a force to the chassis so that an upper end portion of the chassis is separated from the plasma display panel. It is a method of disassembling the location.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to decompose | disassemble a panel, a sheet | seat, and a chassis easily, without generating a panel crack, the recycle rate of panel glass improves, and it can raise the effective use of resources.

  Embodiments of the present invention will be described below with reference to the drawings.

  First, the structure of the PDP constituting the plasma display device will be described with reference to FIG. As shown in FIG. 1, a plurality of display electrodes 4 are formed on a glass front substrate (front substrate) 1 so as to be paired with a stripe-shaped scanning electrode 2 and a stripe-shaped sustaining electrode 3. A dielectric layer 5 is formed so as to cover the display electrode 4, and a protective layer 6 is formed on the dielectric layer 5.

  A plurality of striped address electrodes 8 are formed on a glass rear substrate (back substrate) 7 and a dielectric layer 9 is formed so as to cover the address electrodes 8. On the dielectric layer 9 between the address electrodes 8, a plurality of partition walls 10 are arranged in parallel with the address electrodes 8, and phosphors that emit red, green, or blue light on the side surfaces of the partition walls 10 and the surface of the dielectric layer 9. Layer 11 is formed.

  The front substrate 1 and the rear substrate 7 are arranged so as to face each other so that the display electrodes 4 and the address electrodes 8 are orthogonal to each other, and the periphery is sealed, and a minute discharge space is formed between the substrates. In this discharge space, for example, a mixed gas of neon and xenon is enclosed as a discharge gas. Discharge cells are provided at positions where the display electrodes 4 and the address electrodes 8 intersect each other.

  In the PDP having such a configuration, by applying a scan pulse to the scan electrode 2 and a write pulse to the address electrode 8, an address discharge is performed between the address electrode 8 and the scan electrode 2, and a discharge to be displayed. After selecting the cell, a sustain discharge is performed between the scan electrode 2 and the sustain electrode 3 by applying a periodic sustain pulse whose polarity is alternately reversed between the scan electrode 2 and the sustain electrode 3. The image is displayed.

  FIG. 2 shows an example of the overall configuration of a plasma display device incorporating the PDP having the structure described with reference to FIG.

  In FIG. 2, a housing that accommodates the PDP 12 includes a front cover 13 and a metal back cover 14, and an opening of the front cover 13 includes a front frame made of glass that also serves as an optical filter and a protection for the PDP 12. 15 is arranged. For example, silver deposition is performed on the front frame 15 in order to suppress unnecessary radiation of electromagnetic waves. The back cover 14 is provided with a plurality of vent holes 14a for releasing heat generated by the PDP 12 and the like to the outside.

  A chassis 16 made of aluminum or the like that holds the PDP 12 is joined to the back side of the PDP 12 via a heat conductive sheet 17, and a plurality of circuits for driving the PDP 12 to display is provided on the back side of the chassis 16. A substrate 18 is attached to form a display unit. The circuit board 18 includes an electric circuit for performing display drive and control of the PDP 12, and a plurality of flexible wirings extending to the electrode terminals provided on the edge of the PDP 12 beyond the edges of the four sides of the chassis 16. They are electrically connected by a plate (not shown). Further, a boss portion 16a for fixing the circuit board 18 and fixing the back cover 14 is protruded from the rear surface of the chassis 16 by integral molding such as die casting. The chassis 16 may be configured by fixing a fixing pin to an aluminum flat plate. The sheet 17 is for efficiently transferring the heat generated in the PDP 12 to the chassis 16 to dissipate heat. At least the surface of the sheet 17 has adhesiveness, and each of the PDP 12 and the chassis 16 and the sheet 17 are bonded. And are adhered. That is, the chassis 16 is bonded to the rear substrate 7 of the PDP 12 via the sheet 17.

  Next, a method for disassembling such a plasma display device will be described with reference to a disassembly process flowchart shown in FIG.

  In FIG. 3, reference numeral 20 denotes a pretreatment process for taking out a PDP unit (display unit) in which the PDP 12, the sheet 17 and the chassis 16 (see FIG. 2) are integrated from a discarded plasma display device (discard display), and 21 is a PDP unit. Is separated into the PDP 12, the chassis 16 and the sheet 17, 22 is a substrate separation process for separating the PDP 12 into the front substrate 1 and the back substrate 7, and 23 is a surface layer (scanning electrode 2) formed on the front substrate 1. , Sustain electrode 3, dielectric layer 5, protective layer 6), and a surface layer removing step 24. Surface layer (address electrode 8, dielectric layer 9, barrier rib 10, phosphor layer) formed on back substrate 7. 11) A surface layer removing step for removing. Hereinafter, each of these steps will be described.

  The waste display is first sent to the pretreatment step 20. In this step, the part of the PDP 12 is taken out from the casing composed of the front cover 13 and the back cover 14 shown in FIG. 2, and the circuit board 18 and the like are removed. Further, the FPC around the PDP 12 is removed by cutting a flexible printed circuit board (FPC) connected to the electrode terminal of the PDP 12 along the end of the PDP 12. As a result, the PDP unit in which the PDP 12, the sheet 17 and the chassis 16 are integrated is taken out. Note that the glass, metal, circuit board, or the like constituting the casing separated in this step is sent to the regeneration step after simple processing such as cleaning.

  The PDP unit taken out in the pretreatment step 20 is sent to the chassis separation step 21 and separated into the PDP 12, the chassis 16 and the sheet 17. The separation method will be described later.

  The PDP 12 taken out in the chassis separation step 21 is sent to the substrate separation step 22. The PDP 12 is configured by joining the front substrate 1 and the back substrate 7 with a sealing member made of frit glass at the periphery thereof. Further, the protective layer 6 formed on the front substrate 1 and the partition wall 10 formed on the back substrate 7 are not bonded, and when the sealing portion bonded by the sealing member is cut from the PDP 12, The structure is divided into a substrate 1 and a back substrate 7. In the substrate separation step 22, the PDP 12 is cut at a position inside the sealing portion, so that the peripheral portion where the sealing member is formed, the front substrate 1 excluding the peripheral portion, and the rear substrate 7 excluding the peripheral portion. And to separate.

  On the front substrate 1 obtained in the substrate separation step 22, a surface layer composed of the scan electrode 2, the sustain electrode 3, the dielectric layer 5 and the protective layer 6 is formed. By removing the upper surface layer, the front substrate 1 (elementary glass substrate) in a state where nothing is formed on the surface is obtained. For example, the surface layer can be removed by polishing the surface layer on the front substrate 1 using a disc-shaped grindstone having diamond abrasive grains on the surface.

  Further, since the surface layer composed of the address electrode 8, the dielectric layer 9, the partition wall 10, and the phosphor layer 11 is formed on the back substrate 7 obtained in the substrate separating step 22, the back surface is removed in the surface layer removing step 24. The surface layer on the substrate 7 is removed. Here, the surface layer on the back substrate 7 can be removed using the same method as the method for removing the surface layer on the front substrate 1 in the surface layer removing step 23.

  Since the front substrate 1 and the back substrate 7 obtained as described above are glass substrates in which nothing is formed on the surface, the glass substrate is pulverized to form a cullet. Can be used as a raw material. Therefore, the recycling rate of the glass substrate can be increased.

  Next, a method of separating the PDP unit into the PDP 12, the chassis 16, and the sheet 17 in the chassis separating step 21 described above will be described with reference to the drawings.

  As shown in FIG. 4, a cover member 25 is attached around the PDP unit in which the PDP 12 and the chassis 16 are joined via a sheet 17. FIG. 4 is a plan view of the PDP unit as seen from the PDP 12 side. The cover member 25 is configured by bending a metal plate into a U shape, and the cover member 25 surrounds the peripheral portion of the PDP 12. Here, cover members 25 are attached to the four sides of the PDP 12, and almost all of the sides of the PDP 12 are covered with the cover member 25. In addition, one end of the cover member 25 enters the gap between the PDP 12 and the chassis 16.

  Next, as shown in FIG. 5, the PDP unit equipped with the cover member 25 is set in the heating device 26, and the PDP unit is heated for a predetermined time. Although the heating temperature and the heating time differ depending on the type of the sheet 17 being used, etc., in this embodiment, the temperature was set to 200 ° C. to 280 ° C., and the heating time was about 25 minutes. As a heating method, a hot air circulation method is used, and the PDP unit is put into the heating device 26 and heated in a state where the heating device 26 reaches a predetermined temperature. In the heating device 26, the PDP unit is placed on a support base 27 with the PDP 12 facing upward, and the support base 27 supports the chassis 16. Reference numeral 26a denotes an inner wall of the heating device.

  When the heating in the heating device 26 is completed, the PDP unit is taken out from the heating device 26 and set on the unit support means 28 as shown in FIG. The unit support means 28 has an inclined surface 28a, and an inclination angle (θ) that is an angle formed by the inclined surface 28a and a horizontal plane is set to 80 degrees. Further, the inclined surface 28a is formed with metal fibers made of stainless steel and has elasticity. That is, the elastic metal sheet 29 produced by knitting metal fibers is formed on the inclined surface, and the thickness of the metal sheet 29 is about 5 to 10 mm. FIG. 6 shows a state in which the PDP 12 of the PDP unit that has reached about 200 ° C. to 280 ° C. is set on the unit support means 28 so that the surface of the PDP 12 is in contact with the metal sheet 29 of the inclined surface 28a.

  When the metal sheet 29 made of metal fiber is provided on the inclined surface 28a of the unit support means 28, even if the PDP 12 heated to high temperature directly contacts the metal sheet 29, the surface of the metal fiber instantaneously increases in temperature. Panel cracks due to a temperature difference between the metal sheet 29 and the PDP 12 are not generated. That is, it is possible to set the high temperature PDP 12 on the unit support means 28 provided with the normal temperature metal sheet 29 without cracking the PDP 12, and to prevent the PDP 12 from cracking, the unit support means 28 is about the same as the PDP 12. It is not necessary to heat to the temperature of.

  Immediately after taking out from the heating apparatus 26, it is high temperature and the adhesive force of the sheet | seat 17 is falling. The disassembly of the PDP 12 and the chassis 16 is started from the state shown in FIG. 7 is an exploded process diagram. After the PDP unit is set on the unit support means 28 as shown in FIG. 6, the U-shaped holding member 30 having rigidity is attached to the upper end of the PDP 12 as shown in FIG. The unit support means 28 is mounted so as to straddle the upper end. In this embodiment, since the cover member 25 is attached to the peripheral portion of the PDP 12, the holding member 30 is attached so as to straddle the cover member 25. That is, one end of the holding member 30 is inserted between the PDP 12 and the chassis 16 (here, between the cover member 25 and the chassis 16), and the other end of the holding member 30 is positioned on the back surface of the unit support means 28. . By mounting the holding member 30 in this manner, the PDP unit is arranged so that there is no gap larger than a predetermined distance (for example, 1 mm) between the upper end portion of the PDP 12 and the upper end portion of the unit support means 28. Movement in the direction of arrow C (the direction away from the unit support means 28) can be restricted. That is, the upper end portion of the PDP 12 can be held on the unit support means 28 by the holding member 30.

  FIG. 8 is a view when seen from the B direction in FIG. Three holding members 30 are mounted along the side of the PDP 12. The holding member 30 may be one long shape or plural. The holding member 30 can be easily set in a narrow space between the PDP 12 and the chassis 16 from above the PDP 12. According to this method, it is possible to hold the high temperature PDP 12 on the unit support means 28 in a short time, so that the workability is excellent. The holding member 30 may be configured to be clipped in addition to the U-shape.

  Next, a peeling force is applied in the direction of arrow C to the upper end of the chassis 16 from the state of FIG. Since the PDP 12 is held by the unit support means 28 by the holding member 30 and its movement is restricted, even if the chassis 16 is separated in the direction of arrow C, the PDP 12 hardly moves. For this reason, when a peeling force is applied to the upper end portion of the chassis 16, the chassis 16 peels from the PDP 12. In addition, the holding member 30 is mounted in a state where the cover member 25 is set, and a force applied to the holding member 30 acts on the cover member 25 when the chassis 16 is peeled off, so that a direct force to the PDP 12 acts. Is suppressed. For this reason, generation | occurrence | production of the local crack of PDP12 can be prevented. Further, when the holding member 30 is arranged substantially evenly in the longitudinal direction at the upper end of the PDP 12, since the local force hardly acts on the PDP 12 when the chassis 16 is peeled off, it is effective that the PDP 12 is cracked. Can be suppressed.

  On the other hand, since the chassis 16 is set in an inclined state with an inclination angle of 80 degrees, the component force of the weight of the chassis 16 is large in the vertical direction and small in the horizontal direction. Since the peeling force applied to the upper end portion of the chassis 16 is a substantially horizontal force, the weight of the chassis 16 hardly affects the peeling force, and the chassis 16 can be peeled by applying a small peeling force. In addition, since the unit support means 28 has an inclined surface, the work for setting the PDP unit on the unit support means 28 can also be achieved by simply placing the PDP unit on the inclined surface. Since the metal sheet 29 is an elastic body and absorbs some impact when the PDP 12 is set, there is very little possibility that panel cracks will occur during the standing operation.

  FIG. 9 is a view showing a state where the chassis 16 is peeled from the sheet 17. When the sheet 17 remains on the PDP 12 side, the sheet 17 can be easily peeled from the PDP 12 by hand. FIG. 10 is a view showing a state where the sheet 17 is peeled from the upper end side of the PDP 12. FIG. 11 is a diagram illustrating a state where the peeling of the sheet 17 is completed. In the state shown in FIG. 11, the temperature of the PDP 12 is lowered to room temperature when it is naturally cooled for about 10 minutes. The holding member 30 and the cover member 25 are removed from the PDP 12 at room temperature. As described above, in the step of heating the PDP unit, the step of heating the PDP unit with the cover member 25 attached so as to cover the peripheral end of the PDP 12 and then separating the chassis 16 and the PDP 12 was performed. Thereafter, the cover member 25 is removed from the PDP 12.

  By performing each step in the chassis separating step 21 as described above, the PDP unit can be separated into the PDP 12, the chassis 16, and the sheet 17.

  In each step of the chassis separation step 21, if the cover member 25 is not attached to the periphery of the PDP 12, the end of the PDP 12 is rapidly cooled when the PDP unit is taken out from the heating device 26, and thermal distortion occurs. Panel cracks may occur due to thermal strain. However, in this embodiment, since the cover member 25 is attached to the periphery of the PDP 12, there is an effect of preventing panel cracks.

  In addition, the inclination angle (θ) of the inclined surface of the unit support means 28 indicates the ease of setting the PDP unit when setting the PDP unit on the inclined surface and the ease of separation when separating the chassis 16 from the PDP 12. This should be set in consideration. If θ is small, the force applied to the chassis 16 that is necessary when separating the chassis 16 from the PDP 12 becomes large and the separation work becomes difficult. Therefore, θ is preferably 60 degrees or more.

  As described above, the PDP, the sheet, and the chassis can be easily disassembled, which is useful when recycling the plasma display device.

Perspective view showing structure of plasma display panel The figure which shows an example of the whole structure of a plasma display apparatus Disassembly process flow diagram of plasma display device The figure which shows the state which attached the cover member to the PDP unit in the board | substrate separation process by one embodiment of this invention. The figure which shows the state which set the PDP unit to the heating apparatus in the board | substrate separation process The figure which shows the state which set the PDP unit to the unit support means in the board | substrate separation process The figure which shows the state which mounted | wore the holding member in the board | substrate separation process Viewed from direction B in FIG. The figure which shows the state which the chassis peeled from the sheet | seat in the same board | substrate separation process The figure which shows the state which peels a sheet | seat from a plasma display panel in the same board | substrate separation process The figure which shows the state after peeling a sheet | seat in the same board | substrate separation process

Explanation of symbols

DESCRIPTION OF SYMBOLS 12 Plasma display panel 16 Chassis 17 Sheet | seat 21 Chassis isolation | separation process 25 Cover member 26 Heating device 27 Support stand 28 Unit support means 29 Metal sheet 30 Holding member

Claims (4)

In a method for disassembling a plasma display device having a display unit in which a plasma display panel and a chassis are joined via a sheet, the step of heating the display unit, and unit support means having an inclined surface on which metal fibers are formed, A step of setting the heated display unit so that a surface of the plasma display panel is in contact with the metal fiber; a step of holding an upper end portion of the plasma display panel on the unit support means; and an upper end portion of the chassis. A method of disassembling a plasma display device, comprising: applying a force to the chassis so as to be separated from the plasma display panel to separate the chassis and the plasma display panel. 2. The upper end of the plasma display panel is held by the unit support means by attaching a holding member so as to straddle the upper end of the plasma display panel and the upper end of the unit support means. A method for disassembling the plasma display device according to claim 1. In the step of heating the display unit, the step of heating the display unit in a state where a cover member is mounted so as to cover the peripheral edge of the plasma display panel, and then separating the chassis and the plasma display panel. The method for disassembling a plasma display device according to claim 1, wherein the cover member is removed from the plasma display panel after being performed. 2. The method of disassembling a plasma display device according to claim 1, wherein the metal fiber formed on the inclined surface of the unit support means has elasticity.

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