JP2011053258A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device favorably discharging heat in the interior when being hung on a wall or set near a wall. <P>SOLUTION: This plasma display device 1 is provided with: a chassis supporting a PDP (plasma display panel) on its front surface; a plurality of circuit boards 19 located within a specific region of the back surface of the chassis; and a back cover 7 having an edge portion 71 covering the outside of the specific region in the back surface of the chassis and a projecting portion 72 containing the plurality of the circuit boards 19. Peripheral walls 74 of the projecting portion 72 are provided with a plurality of air inlets 11 and a plurality of air outlets 10, and a fan is arranged inside a space surrounded by the projecting portion 72. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a plasma display apparatus using a plasma display panel as a display device.

  In recent years, thin display devices have begun to spread rapidly. Such thin display devices are becoming more and more popular in the future and are expected to replace conventional CRTs. Currently, thin display devices are often installed on the floor like conventional CRTs. However, in the future, wall hangings or wall-mounting methods that take advantage of the space-saving features of thin display devices will become mainstream. .

  By the way, in the conventional plasma display device which is one of the thin display devices, an intake port and an exhaust port are provided in the back cover, and forced convection (ventilation) is used by using a fan to exhaust internal heat to the outside. Yes. Some fans use natural convection (ventilation) to discharge internal heat to the outside without using a fan.

  For example, Patent Document 1 discloses a plasma display device 101 as shown in FIG. In the plasma display apparatus 101, a plasma display panel (hereinafter referred to as “PDP”) 102, a chassis 103 that supports the PDP 102 on the front surface, a rear surface of the chassis 103, in a casing constituted by a front cover 108 and a back cover 107. And a plurality of circuit boards 120 attached to each other through bosses. Further, a heat conductive sheet 104 is sandwiched between the PDP 102 and the chassis 103.

  Further, an intake port 111 is provided at the lower part of the back cover 107, an exhaust port 110 is provided at the upper part, and a fan 109 is disposed inside the back cover 107 so as to overlap the exhaust port 110. When the fan 109 is operated, outside air is taken into the back cover 107 through the intake port 111 as indicated by an arrow a in the figure, and air in the back cover 107 is exhausted as indicated by an arrow b in the figure. It is discharged to the outside through 110. Thereby, the chassis 103 and the circuit board 120 are cooled by forced convection, and heat radiated from the PDP 102 through the chassis 103 and heat of the circuit board 120 are discharged to the outside.

JP 2003-162228 A

  However, in the configuration shown in FIG. 3, when the plasma display apparatus 101 is wall-mounted or wall-closed, the back cover 107 approaches or comes into contact with the wall surface, so that the air flows into the intake port 111 and the exhaust port. The outflow of air from 110 is obstructed, and the internal heat cannot be exhausted sufficiently.

  In view of such circumstances, an object of the present invention is to provide a plasma display device that can discharge internal heat satisfactorily even when hung on a wall or close to a wall.

  In order to solve the above-described conventional problems, a plasma display apparatus according to the present invention includes a PDP, a chassis that supports the PDP on the front surface, a plurality of circuit boards positioned on a predetermined area on the rear surface of the chassis, and the chassis. And a back cover that protrudes to the opposite side of the chassis inside the edge and has a protrusion that accommodates the plurality of circuit boards. Has a bottom wall facing the back surface of the chassis across the plurality of circuit boards, and a peripheral wall extending from the periphery of the bottom wall toward the chassis, and the peripheral wall has a plurality of air intakes and a plurality of exhausts. An opening is provided, and a fan is disposed in a space surrounded by the protruding portion.

  According to the above configuration, the circuit boards are centrally arranged, and these circuit boards are accommodated in the protrusions of the back cover, so that a space facing the edge of the back cover is secured around the protrusions of the back cover. can do. And since the air inlet and the air outlet are provided on the peripheral wall of the protruding portion of the back cover, even when the plasma display device is wall-mounted or wall-closed and the bottom wall of the protruding portion approaches or contacts the wall surface, The space facing the edge can be secured as a heat dissipation path for the heat of the circuit board by the fan. Further, the heat radiated from the PDP through the chassis is released to the atmosphere through the edge of the back cover by radiation. Therefore, according to the present invention, the internal heat can be discharged well even when the wall is hung or the wall is moved.

1 is a schematic perspective view showing a configuration of a plasma display device according to an embodiment of the present invention. 1 is a schematic cross-sectional view of the plasma display device of FIG. Schematic sectional view of a conventional plasma display device

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings, but the present invention is not limited thereto.

  1 and 2 show a plasma display device 1 according to an embodiment of the present invention. The plasma display device 1 includes a PDP 2 that displays an image, a chassis 3 that supports the PDP 2 on the front surface, and a plurality of circuit boards 19 that are disposed on the back side of the chassis 3 and that drive the PDP 2. . In FIG. 1, for simplification, a plurality of circuit boards 19 are drawn as one board. In addition, the plasma display device 1 includes a front cover 8 and a back cover 7 that constitute a housing that accommodates the PDP 2, the chassis 3, and the circuit board 19.

  The PDP 2 has a rectangular shape, and in the present embodiment, the installation base 6 having the legs 5 has an upright posture in which the longitudinal direction is substantially horizontal and the short direction is substantially vertical. Has been placed. Specifically, the PDP 2 is configured by adhering a front glass substrate and a back glass substrate, and a discharge space is formed therein.

  The chassis 3 is used as a support material that also serves as a heat sink, and is made of metal such as aluminum in consideration of heat dissipation. Note that a heat conductive sheet 104 may be sandwiched between the PDP 2 and the chassis 3 as in the conventional plasma display device 101 shown in FIG.

  The circuit boards 19 are densely arranged and are located on a predetermined area on the back surface of the chassis 3. In the present embodiment, as shown in FIG. 1, the predetermined area on the back surface of the chassis 3 is a lower center portion of the back surface. As shown in FIG. 2, a plurality of electronic components 19 a are mounted on one surface of the circuit board 19, and the circuit board 19 is parallel to the rear surface of the chassis 3 with the one surface facing the opposite side of the chassis 3. Is arranged. The circuit board 19 is attached to the back surface of the chassis 3 via a boss.

  The front cover 8 is a rectangular frame body when viewed from the front, and covers the peripheral edge of the front surface of the PDP 2. The front cover 8 is made of resin, for example. On the other hand, the back cover 7 has a shape that wraps the PDP 2 and the chassis 3 from above the circuit board 19. The back cover 7 can be made of, for example, a metal with a high-radiation ceramic sheet attached to the front and back, a metal with an alumite treatment such as black, or a metal with carbon black applied. For these metals, an alloy mainly composed of aluminum or iron is used.

  Specifically, the back cover 7 has an edge 71 that covers the outside of the predetermined area on the back surface of the chassis 3, and a protrusion 72 that protrudes to the opposite side of the chassis 3 inside the edge 71 and accommodates the circuit board 19. And have.

  In the present embodiment, since the predetermined area is the lower center of the back surface of the chassis 3, the edge portion 71 that covers the outside has a U-shape that opens downward in a rear view. However, the shape of the edge portion 71 is not limited to this. For example, the predetermined region that defines the region where the circuit board 19 exists is the central portion of the rear surface of the chassis 3, and the edge portion 71 corresponds to the rear view. It may be a rectangular frame.

  The projecting portion 72 extends from the periphery of the bottom wall 73 toward the chassis 3 with the circuit board 19 interposed therebetween, and connects the periphery of the bottom wall 73 and the inner edge of the edge 71. And a peripheral wall 74. The peripheral wall 74 has a rectangular tube shape that is long to the left and right, and a pair of upper side 74 a that constitutes the upper surface of the projecting portion 72, lower side portion 74 b that constitutes the lower surface of the projecting portion 72, and left and right sides of the projecting portion 72. Side part 74c.

  Further, in the present embodiment, as a configuration for performing ventilation in the projecting portion 72, a plurality of air intake ports 12 and internal air for taking in outside air are respectively connected to the upper side portion 74a and the pair of side side portions 74c of the peripheral wall 74 to the outside. A plurality of exhaust ports 11 are provided for exhausting the air. Further, the fan 10 is disposed in the space surrounded by the protrusions 72.

  A partition plate 18 that partitions the space into a front space S1 on the chassis side and a rear space S2 on the bottom wall 73 side is disposed in the space surrounded by the protrusions 72. The intake port 12 is provided at the front side position of the upper side portion 74a and the pair of side portions 74c, and is open to the front space S1, and the exhaust port 11 is formed of the upper side portion 74a and the pair of side portions 74c. It is provided at the rear side position and opens to the rear space S2.

  Each intake port 12 and each exhaust port 11 is actually an assembly of minute through holes arranged on a plurality of straight lines, but in FIG. 1, for simplification, these through holes are formed as one opening. Represents. Each through-hole has a size of about several millimeters so that a user's finger cannot be inserted in order to prevent contact with the inside which becomes a high temperature from the outside. This can prevent burns and the like. In addition, the shape of each through hole may be a rectangle, a circle or an ellipse.

  In the present embodiment, the intake ports 12 and the exhaust ports 11 are arranged in a staggered manner in the circumferential direction of the peripheral wall 74. From the viewpoint of making it difficult for the air discharged from the exhaust port 11 to be taken into the protrusion 72 again from the intake port 12, the intake port 12 and the exhaust port 11 may be separated from each other in the circumferential direction of the peripheral wall 72. preferable. In other words, the intake port 12 and the exhaust port 11 are preferably located at positions that do not overlap in the thickness direction of the chassis 3.

  The partition plate 19 is a heat diffusion plate disposed in parallel with the circuit board 19 so as to contact the electronic component 19 a mounted on the circuit board 19. That is, the circuit board 19 is located in the front space S1. The partition plate 19 is provided with a communication hole 18a that allows the front space S1 and the rear space S2 to communicate with each other, and the fan 10 is attached to the rear surface of the partition plate 19 so as to overlap the communication hole 18a.

  In the present embodiment, a centrifugal fan is employed as the fan 10, and the fan 10 is arranged in such a posture that the air sucked from the front space S1 is discharged upward through the communication hole 18a. A heat sink 17 is attached to the back of the partition plate 1 above the fan 10 so that air discharged upward from the fan 10 flows between the fins of the heat sink 17.

  Further, in the present embodiment, in order to prevent the air discharged from the exhaust port 11 from being taken into the protrusion 72 again from the intake port 12, the upper side portion 74a and the pair of side portions 74c of the peripheral wall 12 are A guide plate 20 is provided that separates a flow path of air sucked into the intake port 12 and a flow path of air discharged from the exhaust port 11. In FIG. 1, the guide plate 20 is omitted to show the positional relationship between the intake port 12 and the exhaust port 11. The guide plate 20 is a rectangular plate-like resin plate having a width of several millimeters, and is fixed to the peripheral wall 12 by welding, for example.

  Next, heat dissipation of the plasma display device 1 of the present embodiment will be described.

  The heat generated in the PDP 2 is released from the front surface of the PDP 2 into the atmosphere by radiation action or the like, and is transmitted from the back surface of the PDP 2 to the chassis 3. The heat transmitted to the chassis 4 is released into the atmosphere via the edge 71 of the back cover 7 by radiation as indicated by an arrow C in FIG.

  On the other hand, the circuit board 19 in the protrusion 72 is cooled by forced convection. That is, when the fan 10 is operated, outside air is taken into the protrusion 72 (front space S1) through the air inlet 12 as indicated by an arrow A in FIG. 2, and air in the protrusion 72 (rear space S2) is As indicated by an arrow B in the figure, it is discharged to the outside through the exhaust port 11. Thereby, the heat of the circuit board 19 is discharged outside.

  More specifically, the heat generated by the electronic component 19a mounted on the circuit board 19 is transferred to the heat sink 17 via the partition plate 18 and the air flowing between the fins of the heat sink 17 by the fan 10 with respect to the heat dissipation of the circuit board 19. Is transmitted to. Furthermore, the heat transmitted to the partition plate 18 is also released into the atmosphere through the bottom wall 73 of the protrusion 72 by radiation. On the other hand, the heat that has not been transferred to the partition plate 18 is transferred to the air flowing into the front space S1 through the air inlet 12.

  As described above, in the plasma display device 1 according to the present embodiment, the circuit boards 19 are centrally arranged, and these circuit boards 19 are accommodated in the protrusions 72 of the back cover 7. A space facing the edge 71 of the back cover 7 can be secured around 72. Since the suction port 12 and the exhaust port 11 are provided in the peripheral wall 74 of the protrusion 72 of the back cover 7, the plasma display device 1 is wall-mounted or wall-closed and the bottom wall 73 of the protrusion 72 is close to the wall surface 9. Even in the case of contact, the space facing the edge 71 of the back cover 7 can be secured as a heat dissipation path of the circuit board 19 by the fan 10. Further, the heat radiated from the PDP 2 through the chassis 3 is released into the atmosphere through the edge 71 of the back cover 7 by radiation.

  Therefore, according to the present embodiment, the internal heat can be discharged well even when the wall is hung or the wall is moved. Moreover, since the thickness of the peripheral edge of the back cover 7 is reduced, a visual reduction in thickness can be realized.

  In the present embodiment, the intake port 12 opens in the front space S1 in front of the partition plate 18, and the exhaust port 11 opens in the rear space S2 in the rear of the partition plate 18. The relatively cool air that is sucked flows along the edge 71 of the back cover 7. Therefore, the edge portion 71 is dissipated not only by radiation but also by heat transfer, and the heat dissipation effect of the PDP 2 can be further promoted. In particular, in the present embodiment, since the intake port 12 and the exhaust port 11 are provided in the upper side portion 74a and the pair of side portions 74c of the peripheral wall 74, heat can be radiated by heat transfer in a wide range at the edge portion 71. it can.

  Furthermore, in this embodiment, since the guide plate 20 is provided on the peripheral wall 74 so as to be positioned between the intake port 12 and the exhaust port 11, a circulation flow from the exhaust port 11 toward the intake port 12 is formed. Can be prevented. Thereby, the exhaust heat property of the circuit board 19 can be improved and the cooling effect can be improved.

  In addition, in the said embodiment, although the inlet 12 and the exhaust port 11 were provided in the upper side part 74a and the pair of side part 74c of the surrounding wall 74, arrangement | positioning of the inlet 12 and the exhaust port 11 is restricted to this. is not. For example, only the intake port 12 may be provided on the pair of side portions 74c, and only the exhaust port 11 may be provided on the upper side portion 74a.

  Alternatively, when the partition plate 18 is not disposed inside the protruding portion 72, the intake port 12 may be provided in the lower side portion 74b and the exhaust port 11 may be provided in the upper side portion 74a.

  Moreover, in the said embodiment, although the circuit board 19 is located in the front space S1, the circuit board 19 may be located in the back space S2.

  Furthermore, the partition plate 18 is not necessarily provided with the communication hole 18a. For example, the front space S1 and the rear side are provided between the lower end portion of the partition plate 18 and the lower side portion 74b of the peripheral wall 74 of the protruding portion 72. A gap that communicates with the space S2 may be formed. In this case, it is also possible to install an axial fan in the gap.

  The present invention is effective in reducing the temperature when circuit boards are arranged in a concentrated manner in order to achieve further thinning in a plasma display device.

1 Plasma display device 2 PDP
DESCRIPTION OF SYMBOLS 3 Chassis 7 Back cover 71 Edge 72 Projection part 73 Bottom wall 74 Perimeter wall 74a Upper side part 74b Lower side part 74c Side side part 8 Front cover 10 Fan 11 Exhaust port 12 Intake port 18 Partition plate 18a Communication hole 19 Circuit board 19a Electronic component 20 Guide plate S1 Front space S2 Rear space

Claims (8)

A plasma display panel;
A chassis that supports the plasma display panel on the front surface;
A plurality of circuit boards located on a predetermined area of the back surface of the chassis;
An edge that covers the outside of the predetermined region on the back surface of the chassis, and a back cover that protrudes to the opposite side of the chassis inside the edge and has a protrusion that accommodates the plurality of circuit boards.
The protrusion has a bottom wall facing the back surface of the chassis across the plurality of circuit boards, and a peripheral wall extending from the periphery of the bottom wall to the chassis side,
A plasma display device, wherein a plurality of air inlets and a plurality of air outlets are provided on the peripheral wall, and a fan is disposed in a space surrounded by the protruding portion. In the space surrounded by the protruding portion, a partition plate that partitions the space into a front space on the chassis side and a rear space on the bottom wall side is disposed,
The plasma display apparatus according to claim 1, wherein the plurality of air inlets are open to the front space, and the plurality of air outlets are open to the rear space. The partition plate is provided with a communication hole that communicates the front space and the rear space.
The plasma display device according to claim 2, wherein the fan is attached to the partition plate so as to overlap the communication hole. The plasma display panel is in an upright posture,
The peripheral wall has an upper side part constituting the upper surface of the projecting part, a lower side part constituting the lower surface of the projecting part, and a pair of side parts constituting the left and right side surfaces of the projecting part,
4. The plasma display device according to claim 2, wherein the plurality of intake ports and the plurality of exhaust ports are provided in each of the upper side portion and the pair of side portions.   The plurality of intake ports and the plurality of exhaust ports are arranged in a staggered manner in the circumferential direction of the peripheral wall, and are separated from each other in the circumferential direction of the peripheral wall. The plasma display device described.   6. The guide plate for separating the flow path of air sucked into the plurality of intake ports and the flow path of air discharged from the plurality of exhaust ports on the peripheral wall. The plasma display device according to claim 1.   The plasma display device according to claim 2, wherein the plurality of circuit boards are located in the front space.   The plasma display device according to any one of claims 2 to 7, wherein the partition plate is a heat diffusion plate disposed so as to contact an electronic component mounted on the plurality of circuit boards.

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