JP2011053447A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device capable of enhancing electromagnetic shielding effect, in an electromagnetic shielding structure, using a conductive film and a back cover. <P>SOLUTION: The plasma display device includes the conductive film arranged to cover the front surface of a plasma display panel; a conductive back cover covering the back side of the plasma display panel; and a frame, arranged to surround the circumference of the plasma display panel and supporting the plasma display panel and the back cover. The edge of the conductive film, projecting to the circumference of the front surface of the plasma display panel, is electrically and directly connected to the back cover. Thus, the back cover and the conductive film can be directly connected to each other, without making the frame interpose, so that the contact resistance is reduced and the electromagnetic shielding effect is enhanced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a plasma display device having an electromagnetic shielding (electromagnetic shielding) structure using a conductive film and a conductive back cover.

  Conventionally, in such a plasma display device, various forms of electromagnetic shielding structures using an electromagnetic shielding filter (conductive film) having an electromagnetic shielding effect have been employed (see, for example, Patent Document 1). Here, the conventional general electromagnetic shielding structure is demonstrated using the schematic diagram of FIGS.

  FIG. 1 is a schematic cross-sectional view showing an electromagnetic shielding structure in a conventional plasma display device. As shown in FIG. 1, a plasma display device 30 includes a plasma display panel (hereinafter referred to as “PDP”) 21 and an electromagnetic shielding filter that is attached so as to cover the front surface (display surface for images, etc.) of the PDP 21. 23, a metallic back cover 26 that covers the rear surface of the PDP 21, and a frame-shaped panel housing on the front side of the plasma display device 30 that is disposed so as to surround the PDP 21 and supports the PDP 21 and the back cover 26. A certain metal frame 27 is provided. The PDP 21 is held by a chassis (for example, aluminum) 22 from the rear surface side, and the chassis 22 holds a plurality of substrates 28 having a control circuit for causing the PDP 21 to display an image. Further, the chassis 22 is supported by the frame body 27 by means such as screw tightening at a plurality of support portions 22a formed at the peripheral edge thereof. Each substrate 28 and the PDP 21 are connected by a wiring 25, and data is transmitted from the substrate 28 to the PDP 21 through the wiring 25, so that an image or the like can be displayed on the PDP 21.

  As the electromagnetic shielding filter 23, for example, one having a structure in which a conductive mesh such as copper is integrally formed on a base film is used. As shown in FIG. 2 (plan view) and FIG. 3 (cross-sectional view), the electromagnetic shielding filter 23 includes a conductive mesh region R31 and a connection region R32 formed at the periphery of the conductive mesh region R31. An image displayed on the PDP 21 is visible from the outside of the apparatus through the conductive mesh region R31. The connection region R32 of the electromagnetic shielding filter 23 is electrically connected to the frame body 27 via a gasket 24 formed of a soft conductive material. Further, the back cover 26 is fixed to the frame body 27 using a plurality of screws 29, and both are electrically connected.

  Thus, in the plasma display device 30, the electromagnetic shielding structure that covers the PDP 21 and the substrate 28 is formed in a state where the electromagnetic shielding filter 23, the back cover 26, the frame body 27, and the gasket 24 are electrically connected. Yes.

Japanese Patent Laid-Open No. 11-305676

  In such a conventional electromagnetic shielding structure, the electromagnetic shielding filter 23 and the back cover 26 are electrically connected via the frame body 27 and the gasket 24, and the back cover 26 is attached to the frame body 27 with screws 29. A fixed structure is adopted. In such a structure, the back cover 26 and the frame 27 can be reliably conducted at the screw tightening location, but a gap or the like is generated between the back cover 26 and the frame 27 at a portion other than the screw tightening location. In some cases, a portion where conduction cannot be ensured partially occurs. Therefore, in the conventional electromagnetic shielding structure, there is a risk that electromagnetic leakage may occur due to the presence of a portion where conduction cannot be ensured partially, and a high electromagnetic shielding effect cannot be obtained. In recent years, such problems tend to become more prominent as the PDP becomes thinner and larger.

  Further, in the configuration in which the electromagnetic shielding filter 23 integrally formed with the conductive mesh is attached to the front surface of the PDP 21, and the conductive connection region R32 of the electromagnetic shielding filter 23 is connected to the rigid frame 27 via the gasket 24. There is also a problem that stress is applied to the PDP 21 formed of glass and the glass may break.

  Accordingly, an object of the present invention is to solve the above-described problem and provide a plasma display device capable of enhancing the electromagnetic shielding effect in an electromagnetic shielding (electromagnetic shielding) structure using a conductive film and a back cover. There is to do.

  In order to achieve the above object, the present invention is configured as follows.

  According to the first aspect of the present invention, a plasma display panel, a conductive film having a larger area than the front surface of the plasma display panel and arranged to cover the front surface of the plasma display panel, and the rear surface of the plasma display panel A conductive back cover that covers the side of the plasma display panel, and a frame that supports the plasma display panel and the back cover, and that protrudes around the front surface of the plasma display panel. Provided is a plasma display device in which an edge portion of the device and a back cover are directly electrically connected.

  According to the second aspect of the present invention, the conductive film is slack so that the conductive film is slack between the connection area with the back cover at the edge of the conductive film and the arrangement area on the front surface of the plasma display panel. The plasma display apparatus according to the first aspect, in which the connection region is positioned with respect to the region where the conductive film is disposed.

  According to the third aspect of the present invention, the frame body includes a plurality of support members that support the plasma display panel, and a plurality of through holes corresponding to the arrangement of the plurality of support members are formed at the edge of the conductive film. The plasma display according to the second aspect, wherein the connection region is positioned with respect to the arrangement region of the conductive film so that the conductive film is slackened by the support member being passed through each through hole. Providing equipment.

  According to the fourth aspect of the present invention, the back cover includes an elastic portion that presses the connection region at the edge of the conductive film, and the conductive film is pressed against and held by the elastic portion against the frame. The plasma display device according to any one of the first to third aspects, in which the elastic part and the conductive film are electrically connected directly.

  According to the fifth aspect of the present invention, the back cover is fixed to the frame, and the fixing position of the back cover to the frame and the connection position of the conductive film and the back cover are different from each other. A plasma display device according to any one of four aspects is provided.

  According to a sixth aspect of the present invention, there is provided the plasma display device according to any one of the first to fifth aspects, wherein the frame is formed of a non-conductive material.

  According to the present invention, in the plasma display device, the edge of the conductive film that protrudes around the front surface of the PDP and the back cover are directly electrically connected without using a frame or the like. It has been adopted. Therefore, the electrical connection between the conductive film and the back cover can be reliably performed as compared with the structure in which the frame body is connected via the frame body. Therefore, in the plasma display device, an electromagnetic shielding structure having a high electromagnetic shielding effect can be provided.

Schematic sectional view of electromagnetic shielding structure in a conventional plasma display device Plan view of electromagnetic shielding filter in conventional electromagnetic shielding structure Sectional view of electromagnetic shielding filter in conventional electromagnetic shielding structure 1 is a schematic cross-sectional view of an electromagnetic shielding structure in a plasma display device according to an embodiment of the present invention. The top view of the electromagnetic shielding filter in the electromagnetic shielding structure of embodiment of this invention Sectional drawing of the electromagnetic shielding filter in the electromagnetic shielding structure of embodiment of this invention

  Embodiments according to the present invention will be described below in detail with reference to the drawings.

  FIG. 4 is a schematic cross-sectional view showing an electromagnetic shielding structure in the plasma display device according to one embodiment of the present invention.

  As shown in FIG. 4, the plasma display device 10 includes a PDP 1, an electromagnetic shielding filter (an example of a conductive filter) 3 attached so as to cover the front surface (display surface for images, etc.) of the PDP 1, and the PDP 1. A metal (conductive) back cover 6 covering the rear surface of the PDP 1 is disposed so as to surround the periphery of the PDP 1, supports the PDP 1 and the back cover 6, and is a front-side frame-like panel housing in the plasma display device 10. And a metal frame 7. The PDP 1 is held by a chassis (for example, aluminum) 2 from the rear surface side, and the chassis 2 holds a plurality of substrates 8 having a control circuit for displaying an image on the PDP 1. Further, each substrate 8 and PDP 1 are connected by wiring 5, and data and the like are displayed on PDP 1 by transmitting data from substrate 8 to PDP 1 through wiring 5.

  As the electromagnetic shielding filter 3, for example, a filter having a structure in which a conductive mesh such as copper is bonded to a base film such as polyester is integrally formed. Specifically, as shown in FIG. 5 (plan view) and FIG. 6 (cross-sectional view), the pasting region (arrangement region) R1 on the front surface of the PDP 1 in the electromagnetic shielding filter 3 is formed to include a conductive mesh. The video displayed on the PDP 1 is visible from the outside of the apparatus through the conductive mesh. Further, a portion surrounding the pasting region R <b> 1 is an edge portion 3 a of the electromagnetic shielding filter 3. The edge 3a is a part that is not attached to the front surface of the PDP 1 but protrudes to the outer periphery of the front surface of the PDP 1 and extends in a frame shape in plan view. That is, the electromagnetic shielding filter 3 that is slightly larger than the front surface of the PDP 1 is used, and the edge 3 a of the electromagnetic shielding filter 3 protrudes outside the respective sides of the front surface of the PDP 1. This edge 3a is formed not including a conductive mesh but including, for example, a metal foil. In addition, the metal foil of the edge 3a and the conductive mesh in the pasting region R1 are electrically connected to each other.

  As shown in FIG. 4, the frame body 7 is formed to have a substantially L-shaped cross section in which a side panel 7a and a front panel 7b are integrally formed. A plurality of bosses (an example of a support member) 7 c are formed on the inner side of the front panel 7 b of the frame body 7 so as to protrude toward the rear surface side in the thickness direction of the PDP 1. Are arranged along the entire perimeter. A plurality of support portions 2 a are formed on the peripheral edge of the chassis 2 so as to protrude outward. As shown in FIG. 4, the respective support portions 2 a of the chassis 2 are fixed to the respective bosses 7 c of the frame body 7 by means such as screw tightening (not shown), so that the chassis 2 holding the PDP 1 is formed. It is supported by the frame body 7. In such a support state, the PDP 1 and the frame 7 are not in contact with each other.

  As shown in FIG. 4, the back cover 6 includes a rear surface side cover portion 6 a disposed on the rear surface side of the PDP 1 and the chassis 2, and four side surface side cover portions 6 b disposed on the side surface side of the PDP 1 and the chassis 2. Is provided. The rear surface side cover portion 6a and the four side surface side cover portions 6b are formed of a metal material which is a conductive material, and the back cover 6 is configured by integrating the respective cover portions 6a and 6b. ing. A fixing protrusion (crosspiece) 6c is formed on the outer periphery of the side surface side cover 6b, and the fixing protrusion 6c is fixed to the side panel 7a of the frame 7 using, for example, screws 9. Thus, the back cover 6 is fixed to the frame body 7. Further, a leaf spring 6d, which is an example of an elastic portion, is formed at the tip of the side cover portion 6b of the back cover 6. In a state where the back cover 6 is fixed to the frame body 7, the fixing protrusion 6 c and the plate spring 6 d are arranged so that the leaf spring 6 d can press the inner surface of the front panel 7 b of the frame body 7 with its elastic force. The formation position is set.

  As shown in FIG. 5 and FIG. 6, a plurality of through holes 3 b are formed in the edge 3 a of the electromagnetic shielding filter 3 along the outer periphery of the pasting region R <b> 1. It is formed so as to coincide with the arrangement of the respective bosses 7c. The edge 3 a of the electromagnetic shielding filter 3 is positioned with respect to the frame body 7 by passing the boss 7 c through each through hole 3 b. Thus, the through hole 3b is used as a positioning hole.

  In addition, a region outside the position where each through-hole 3b is formed in the edge 3a of the electromagnetic shielding filter 3 (a region in a frame shape in plan view) is directly connected to the back cover 6 and a connection region R2 that is electrically connected. It has become. Specifically, the leaf spring 6d formed at the tip of the side cover portion 6b of the back cover 6 at the edge portion 3a of the electromagnetic shielding filter 3 positioned with the boss 7c passing through each through hole 3b. And the frame-shaped connection region R2 are directly electrically connected. Furthermore, when the connection region R2 of the electromagnetic shielding filter 3 is pressed against the front panel 7b of the frame 7 by the elastic force of the leaf spring 6d, the electromagnetic shielding filter 3 is interposed between the front panel 7b and the leaf spring 6d. The electrical connection state is maintained.

  Since the edge part 3a of the electromagnetic shielding filter 3 is formed as a metal foil part, the electrical connection state with the leaf | plate spring 6d of the back cover 6 can be made favorable. Further, from the viewpoint of improving the electrical connection state, a plate spring 6d is continuously formed at the tip of each of the four side surface side cover portions 6b, and the plate spring 6d having a planar view frame shape is formed in the plan view frame. It is preferable to make it contact with the connection region R2. Further, it is desirable to design the shape of the leaf spring 6d and the like so that the contact area between the leaf spring 6d of the back cover 6 and the connection region R2 of the electromagnetic shielding filter 3 can be secured larger. For example, it is also effective to provide an uneven portion at the connection portion of the leaf spring 6d to increase the contact area between the two.

  In addition, as shown in FIG. 4, in the state where the electromagnetic shielding filter 3 is positioned with respect to the frame body 7 and the electromagnetic shielding filter 3 is electrically connected to the back cover 6, the edge of the electromagnetic shielding filter 3. The formation positions of the respective through holes 3b are set so that slack (or “deflection” or “play”) occurs in 3a. That is, a slack portion 3c is intentionally provided in the filter portion between the sticking region R1 and the connection region R2 of the electromagnetic shielding filter 3. Due to the presence of the slack portion 3c, electromagnetic shielding due to dropping or vibration is caused. Damage to the filter 3 is prevented. 5 and 6 are a plan view and a cross-sectional view of a single unit of the electromagnetic shielding filter 3, in which the slack portion 3c does not exist.

  According to such an electromagnetic shielding structure, the electromagnetic shielding filter 3 can be directly connected to the back cover 6 without interposing the frame body 7. Further, the edge 3a, which is a metal foil portion of the electromagnetic shielding filter 3, is directly connected to the leaf spring 6d while being pressed by the elastic force of the leaf spring 6d formed on the back cover 6. Contact resistance can be reduced as compared with the configuration. Further, by pressing the flat spring frame-shaped plate spring 6d against the edge portion 3a of the planar frame-shaped electromagnetic shielding filter 3, the electromagnetic shielding structure can be connected to each other without any gap and electromagnetic leakage is reduced. Can be realized.

  In addition, since the slack portion 3c is provided between the attachment region R1 and the connection region R2 of the electromagnetic shielding filter 3, it is possible to prevent the electromagnetic shielding filter 3 from being damaged due to dropping or vibration.

  Further, since a configuration in which the back cover 6 and the electromagnetic shielding filter 3 are directly connected is adopted, a soft conductive material such as a gasket used in the conventional structure can be eliminated, and the electromagnetic shielding structure is simple and inexpensive. It can be a simple structure. In addition, the electromagnetic shielding structure can be a thin structure.

  In addition, since members other than the electromagnetic shielding filter 3 are not disposed on the front surface of the PDP 1, no force from other members is applied to the front surface of the PDP 1, and it is possible to eliminate the risk of damage to the PDP 1 due to stress.

  In the above description, the case where the frame 7 is formed of a conductive material in the electromagnetic shielding structure has been described as an example. However, instead of such a case, the frame 7 is formed of a nonconductive material. It may be a case. Since the structure in which the electromagnetic shielding filter 3 and the back cover 6 are directly electrically connected is employed, the frame body 7 can be formed of a material other than the conductive material. Therefore, for example, if the frame is formed of a member that can be easily processed, the manufacturing cost can be reduced, and the frame is formed of a special material to provide an apparatus with excellent design. be able to.

  Further, the back cover 6 is preferably formed of a conductive material (for example, a metal material), but this is a case where an insulating material is partially used as long as the electromagnetic shielding effect can be exhibited. May be. For example, from the viewpoint of electrical safety, an insulating coating can be applied to the outer surface of the back cover 6. In this case, the connection portion of the back cover 6 with the electromagnetic shielding filter 3, that is, the portion of the leaf spring 6d needs to be conductive.

  Moreover, although the case where the leaf | plate spring 6d was provided in the back cover 6 was demonstrated in the said description, this embodiment is not limited only about such a case. The back cover 6 and the electromagnetic shielding filter 3 may be electrically connected directly, and may be a case where the leaf spring 6d is not provided. However, by providing the leaf spring 6d, the connection between the two can be maintained and stabilized.

  It is to be noted that, by appropriately combining arbitrary embodiments of the various embodiments described above, the effects possessed by them can be produced.

1 PDP (Plasma Display Panel)
2 Chassis 3 Electromagnetic shielding filter 3a Edge 3b Through hole 3c Loose portion 5 Wiring 6 Back cover 6a Rear side cover 6b Side side cover 6c Fixing protrusion 6d Leaf spring 7 Frame 7a Side panel 7b Front panel 7c Boss 8 Substrate 9 Screw 10 Plasma display device R1 Pasting area R2 Connection area

Claims (6)

A plasma display panel;
A conductive film having a larger area than the front surface of the plasma display panel and arranged to cover the front surface of the plasma display panel;
A conductive back cover covering the rear side of the plasma display panel;
It is arranged so as to surround the periphery of the plasma display panel, and includes a frame body that supports the plasma display panel and the back cover,
A plasma display device in which an edge portion of a conductive film that protrudes around a front surface of a plasma display panel and a back cover are directly connected electrically.   The connection region with respect to the conductive film placement region so that the conductive film is slack between the connection region with the back cover at the edge of the conductive film and the placement region on the front surface of the plasma display panel. The plasma display device according to claim 1, wherein is positioned. The frame includes a plurality of support members that support the plasma display panel,
At the edge of the conductive film, a plurality of through holes corresponding to the arrangement of the plurality of support members are formed,
The plasma display device according to claim 2, wherein the connection region is positioned with respect to the region where the conductive film is arranged so that the conductive member is slackened by the support member being passed through each through hole. The back cover includes an elastic portion that presses the connection region at the edge of the conductive film,
The plasma according to any one of claims 1 to 3, wherein the elastic part is pressed and held against the frame body, and the elastic part and the conductive film are electrically connected directly. Display device.   The plasma display according to any one of claims 1 to 4, wherein the back cover is fixed to the frame, and a fixing position of the back cover to the frame and a connection position of the conductive film and the back cover are different from each other. apparatus.   The plasma display device according to claim 1, wherein the frame is formed of a non-conductive material.

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