JPH11133871A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display device which has a smart design in which the front surface of the device is substantially flat, facilitates the work of mounting an optical filter, and can reliably prevent or suppress unnecessary radiation of radio waves. The purpose is to do. SOLUTION: A housing 1 which stores a plasma display unit 2 and has an opening 10 on the front surface and has a conductive region on the outer surface side around the opening 10 and an optical filter 3 on which a conductive thin film 32 is formed. A fixing member 4 for fixing the outer edge of the optical filter 3 to the outer surface around the opening 10 of the housing 1
And an elastic conductive member 5 provided between the conductive region of the housing 1 and the conductive thin film 32 of the optical filter 3 and electrically connecting the conductive region and the conductive thin film 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device for displaying television images and the like, and more particularly, to a plasma display device with an optical filter that reduces unnecessary radiation of radio waves.

[0002]

2. Description of the Related Art A plasma display device has a feature that it can be used as a wall-mounted television receiver because the depth of the device can be greatly reduced as compared with a CRT type receiver having the same screen size. However, since the principle of light emission of the plasma display device is based on the fact that a phosphor applied inside emits light by using ultraviolet rays in plasma discharge to form a display screen, unnecessary radiation of radio waves is generated. Therefore, it is indispensable to form a transparent conductive film or the like on the optical filter provided on the front surface of the screen and shield it.

FIG. 7 is a sectional view showing a conventional plasma display device disclosed in Japanese Patent Application Laid-Open No. 9-51494. In this figure, reference numeral 1 denotes a housing having an opening 10 on the front surface, and a conductive plating film 12 is formed on the inner surface. 2 denotes a plasma display unit housed in the housing 1; An optical filter 7 provided on the inner surface side of the opening 10 is a screw for fixing the optical filter 2 to the housing 1. A transparent conductive film 30 is formed on the optical filter 3, and is electrically connected to the projection 15 provided on the inner surface side of the housing 1 by contact.

[0004]

Since the conventional plasma display device is constructed as described above, a step is formed between the front surface of the housing and the front surface of the optical filter, so that a flat front surface cannot be designed. There was a problem.

[0005] In addition, there is also a problem that the depth of the device is increased due to the step formed between the front surface of the housing and the optical filter.

Furthermore, since the optical filter is screwed from the inner surface of the housing, there is a problem that workability when mounting the optical filter is poor.

The present invention has been made in view of the above circumstances, has a smart design in which the front surface of the device is substantially flat, facilitates the work of mounting an optical filter, and reliably prevents or suppresses unnecessary radiation of radio waves. It is an object of the present invention to provide a plasma display device capable of performing the above.

Another object of the present invention is to provide a plasma display device in which the electrical connection between the optical filter and the housing is securely performed and the work of mounting the optical filter is simplified.

[0009]

SUMMARY OF THE INVENTION A plasma display device according to the present invention houses a plasma display unit, has an opening on the front surface, has a conductive region on the outer surface around the opening, and a conductive thin film. Is formed between the optical filter, the fixing member for fixing the outer edge of the optical filter to the outer surface near the opening of the housing, and the conductive region of the housing and the conductive thin film of the optical filter. And an elastic conductive member that electrically connects the conductive region and the conductive thin film.

[0010] In the plasma display device according to the present invention, the conductive thin film is formed of a fibrous conductive member arranged in a mesh.

Further, in the plasma display device according to the present invention, the elastic conductive member is made of conductive rubber having a hollow area inside.

Further, in the plasma display device according to the present invention, the conductive thin film has an insulating film, and the elastic conductive member is formed of a metal plate spring having a projection at the tip on the optical filter side.

Further, the plasma display device according to the present invention is configured such that one or more slits are provided in the elastic conductive member, and the elastic conductive members between the slits are independently bent.

Further, in the plasma display device according to the present invention, the fixing member is formed of a double-sided adhesive tape for fixing the rear surface of the outer edge of the optical filter to the outer surface around the opening of the housing.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. In the drawings, components corresponding to conventional components are denoted by the same reference numerals, and description thereof is omitted.

Embodiment 1 FIG. 1 is an assembly configuration diagram showing an outline of an example of a plasma display device according to a first embodiment of the present invention. 1A in the figure is a front cover,
1B is a back cover, 2 is a plasma display unit, 3 is an optical filter, and the plasma display unit 2 is stored in a housing 1 composed of a front cover 1A and a back cover 1B.

The front cover 1A has an opening 10 for displaying a screen on the front surface thereof.
0 Double-sided adhesive tape 4 and conductive rubber 5
Is affixed. Double-sided adhesive tape 4 as a fixing member
Is adhered around the opening 10, and the conductive rubber 5 as an elastic conductive member is further adhered to the outer peripheral side. The optical filter 3 is formed in a size that can cover the opening 10, and the peripheral back surface of the optical filter 3 is attached and fixed to the outer surface of the front cover 1 </ b> A around the opening 10 by the double-sided adhesive tape 4.

FIG. 2 is a diagram showing in more detail the main parts of the plasma display device shown in FIG. 1, and shows a part of a cross-sectional view taken along the line XX shown in FIG. . Front cover 1A is plastic molded product 1
1 is formed by forming a conductive plating film 12 and an insulating coating film 13 on the surface. The conductive plating film 12 is formed to cover the entire surface of the plastic molded product 11, and a coating film 13 is further formed on the conductive plating film 12. The coating film 13 can be formed in all or a part of the region except the region where the conductive rubber 5 is in contact with the front cover 1A, and the region on the surface of the front cover 1A where the coating film 13 is not formed is formed. The conductive plating film 12 becomes a conductive region exposed. The illustrated coating film 13 is formed only on a portion visible from the outside of the plasma display device, that is, only on the design surface.

The optical filter 3 is manufactured by processing both surfaces of a base 31 made of acrylic having predetermined optical characteristics. That is, a conductive mesh 32 as a conductive thin film and a transparent sheet 33 are bonded to the back surface of the base 31, and a predetermined range of screen printing 34 is performed on the front surface of the base 31 and a hard surface is formed on the outermost surface. The coat sheet 35 is stuck.

The shape of the conductive mesh 32 is made substantially equal to the outer size of the base 31, and the shape of the transparent sheet 33 is made slightly smaller than the outer size of the base 31. The exposed portion 36 of the conductive mesh 32 can be formed on the substrate.

The double-sided adhesive tape 4 and the conductive rubber 5 are provided on the front surface of the front cover 1A, that is, on the outer surface around the opening 10. The double-sided adhesive tape 4 is attached to the inner peripheral side of the conductive rubber 5, and the rear surface of the transparent sheet 33 is fixed to the outer surface of the front cover 1 </ b> A,
Is held in the housing 1. The conductive rubber 5 is formed so as to have a hollow region inside, and can have, for example, a tubular shape as shown in FIGS. 1 and 2. The conductive rubber 5 is mounted on the front cover 1A using a double-sided adhesive tape 50, and the mounting position is an exposed area of the conductive plating film 12 and the optical filter 3
Is a position where it comes into contact with the exposed portion 36 of the conductive mesh 32 when attached.

By fixing the front panel 1 and the optical filter 3 with the double-sided adhesive tape 4, the hollow conductive rubber 5 disposed between the front panel 1A and the optical filter 3 is bent by a predetermined amount. Then, the conductive plating film 12 and the exposed portion 36 of the conductive mesh 32 are electrically connected.
For this reason, even if the flatness of the optical filter 3 varies, or even if a part of the optical filter 3 is slightly lifted, the front cover 1 </ b> A And the optical filter 3 can be reliably connected, and unnecessary radiation of radio waves from the front surface of the plasma display device can be reliably prevented or suppressed.

Further, by forming the conductive rubber 5 so as to have a hollow region therein, the amount of deflection can be increased. Therefore, when the dispersion of the flatness of the optical filter 3 is large, Even if the float of the optical filter is larger, the front cover 1A and the optical filter 3
Electrical connection with the device.

The optical filter 3 is connected to the front cover 1.
By attaching to the outer surface side of A, the front surface of the device can be made flat as compared with the conventional device, and a plasma display device with a smart design can be provided. In particular, the front surface of the front cover 1A, that is, the front surface of the outermost peripheral portion 14 of the front cover 1A in FIG. Further, by making the front surface of the device flat, the depth dimension of the entire device can be reduced.

The optical filter 3 is connected to the front cover 1.
By attaching the optical filter to the outer surface side of A, the workability at the time of attaching the optical filter can be improved as compared with the conventional plasma display device in which the optical filter is attached from the inner surface side of the housing. Further, by fixing the rear surface of the optical filter 3 and the outer surface of the front cover 1A with an adhesive member such as a double-sided adhesive tape, compared with a conventional plasma display device in which the optical filter is attached by screws or the like.
Workability at the time of mounting the optical filter can be improved.

In this embodiment, the optical filter 3
Has been described in the case where the double-sided adhesive tape 4 is used as a fixing member for fixing the optical filter 3 to the front cover 1A. However, the fixing member may be any means for fixing the rear side of the optical filter 3 to the front side of the front cover 1A. An adhesive can be used instead of the double-sided adhesive tape.

In this embodiment, the case where the conductive rubber 5 is used as the elastic conductive member has been described. However, the elastic conductive member may be a member having conductivity and elasticity. A leaf spring or a coil spring can also be used.

Further, in the present embodiment, a tubular conductive rubber having a hollow inside is used as the elastic conductive member, but a sponge-like member having a plurality of fine hollows inside is used. Is also good.

Also, when the material of the elastic conductive member itself has sufficient elasticity and the variation in flatness of the optical filter is within a predetermined range, or when the floating of the optical filter 3 is within a predetermined range. The elastic conductive member may be configured without having a hollow portion.

Further, the conductive thin film in the present specification is:
This means a conductive member having a shape sufficiently smaller in thickness than the width, and as an example, a case where a conductive mesh is used in the present embodiment is described. The mesh is intended to be formed by arranging fibrous members in a mesh or the like, and the conductive mesh 32 may be formed by arranging conductive fibers in a mesh or the like, or Fibers arranged in a network or the like may be processed by conducting a process such as conductive plating.

Embodiment 2 FIG. 3 is an assembly configuration diagram showing an outline of one configuration example of the plasma display device according to the second embodiment of the present invention. This plasma display device differs from the case of FIG. 1 in that a leaf spring 6 is used as an elastic conductive member. FIG. 4 is a diagram showing the main part of the plasma display device in more detail.
FIG. 4 shows a part of a cross-sectional view taken along the line YY in FIG. 3.

FIG. 5 is a perspective view showing the leaf spring 6 shown in FIGS. 3 and 4 in more detail. The leaf spring 6 is made of metal, and its cross section has a substantially C-shaped spring portion 60 that generates a restoring force, and both ends of the spring portion 60 are bent outward to make contact with the front cover 1A or the optical filter 3. It comprises contact portions 61 and 64. A minute protrusion 65 is provided at the tip of the contact portion 64 on the optical filter 3 side, and the leaf spring 6 is configured to have a large number of protrusions 65 in the longitudinal direction. A plurality of slits 66 are provided on the optical filter side of the spring portion 60 at predetermined intervals in the longitudinal direction. The leaf spring 6 has a spring portion 60 mounted on the front cover 1A using a double-sided adhesive tape 50.
The mounting position is an exposed area of the conductive plating film 12 and a position where the optical filter 3 is in contact with the exposed portion 36 of the conductive mesh 37 when the optical filter 3 is mounted.

FIG. 6 shows the conductive mesh 37 shown in FIG.
FIG. 2 is a perspective view showing a part of FIG. 3 in further detail, and FIG. 3B is a partially enlarged view of FIG. Unlike the case of the first embodiment, the conductive mesh 37 is formed by forming a conductive plating film 371 on the fiber 370 and then, as an outer skin thereof, an insulating film colored to improve the contrast of the screen, For example, a black coating film 372 is further formed. The other configuration is the same as that of the first embodiment, and the description is omitted.

The double-sided adhesive tape 4 is attached to the front cover 1A.
And the optical filter 3, the leaf spring 6 disposed between the front cover 1A and the optical filter 3 bends by a predetermined amount.
The protrusion 65 of the leaf spring 6 in contact with the coating film 372
And is electrically connected to the internal conductive plating film 371. Therefore, the coating film 372 of the conductive mesh 37
Can be electrically connected between the front cover 1A and the optical filter 3 without previously peeling off, and unnecessary radiation of radio waves from the front surface of the plasma display device can be prevented or suppressed.

Even if the flatness of the optical filter 3 varies, or even if a part of the optical filter 3 floats, the bending of the leaf spring 6 absorbs them, and Since the electrical connection between the optical filter 1A and the optical filter 3 can be reliably performed, unnecessary radiation of radio waves from the front surface of the plasma display device can be reliably prevented or suppressed.

Further, the restoring force of the bent leaf spring 6 ensures that the front cover 1A and the optical filter 3 can be maintained in an electrically connected state even after the optical filter is fixed. Even when a shock or the like is applied, unnecessary radiation of radio waves from the front surface of the plasma display device can be reliably prevented or suppressed.

Further, by providing the slits 66 in the leaf springs 6, the spring portions 60 can bend independently between the adjacent slits 66, respectively. For this reason,
When the variation in flatness is large or when the optical filter 3
The front cover 1
A can be reliably connected to the optical filter 3 electrically, and the front cover 1A and the optical filter 3 can be maintained in an electrically connected state even after the optical filter 3 is fixed.

The number of parts of the plasma display apparatus can be reduced as compared with the case where a plurality of independent leaf springs 6 are provided by providing the slits 66 and bending a part of the leaf springs 6 independently. At the same time, the work efficiency of the assembly can be improved.

Although the present embodiment has been described using the leaf spring 6 having a substantially C-shaped cross section, it may bend according to the distance between the front surface of the front cover 1A and the rear surface of the optical filter 3. The cross-sectional shape is not limited as long as it can be formed. The leaf spring 6 does not need to be made of metal as long as it has conductivity. For example, the leaf spring 6 may be made of an insulating material provided with a conductive film.

In the present embodiment, the leaf spring 6
Although the case where many slits 66 are provided has been described, the slits 66 may be provided as needed. That is,
If the variation in the flatness of the optical filter 3 is small or if the floating generated in a part of the optical filter 3 is small,
The slit 66 need not be provided. Further, the number of the slits 66 can be one or two or more according to the variation in flatness and the size of the floating. Furthermore, front cover 1
When the variation in the flatness of the front surface A is large, by providing the slit 66 on the front cover side of the leaf spring,
The electrical connection between the front cover 1A and the leaf spring 6 can also be reliably performed.

In this embodiment, the case where the insulating film formed on the conductive thin film is the coating film 372 for the coloring treatment has been described. The purpose of doing is not limited. Insulation here means that it does not have conductivity enough to prevent unnecessary radiation of radio waves.

[0042]

In the plasma display device according to the present invention, the fixing member fixes the outer edge of the optical filter to the outer surface around the opening of the housing, so that a step between the housing and the optical filter can be eliminated. . Moreover, since the elastic conductive member is disposed between the conductive region around the opening and the conductive thin film of the optical filter, the elastic conductive member bent by the fixation of the optical filter is restored with the housing. Electrical connection with the optical filter can be reliably performed. Therefore, it is possible to provide a plasma display device which has a smart design in which the front surface of the device is substantially flat, facilitates the work of mounting the optical filter, and can reliably prevent or suppress unnecessary radiation of radio waves.

The plasma display device according to the present invention comprises a fibrous conductive member in which conductive thin films are arranged in a mesh. For this reason, the electrical connection between the fibrous conductive member and the conductive region of the housing can be reliably performed by the restoring force of the elastic conductive member.

In the plasma display device according to the present invention, the elastic conductive member is a conductive rubber having a hollow region inside, and the amount of bending can be increased as compared with a device having no hollow region. Therefore, the electrical connection between the housing and the optical filter can be made more reliably.

In the plasma display device according to the present invention, the protrusion at the tip of the leaf spring penetrates the insulating film formed on the conductive thin film, thereby making electrical connection between the leaf spring and the conductive thin film. it can. Therefore, it is not necessary to peel off the insulating film on the conductive thin film in advance, and the work of mounting the optical filter can be facilitated, and the electrical connection between the optical filter and the housing can be reliably performed.

In the plasma display device according to the present invention, one or more slits are provided in the elastic conductive member, and the elastic conductive members between the slits are independently bent. Therefore, the electrical connection between the housing and the optical filter can be made more reliably.

In the plasma display device according to the present invention, the back surface of the outer edge of the optical filter and the outer surface near the opening of the housing are fixed with a double-sided adhesive tape. For this reason,
The plasma display device can be configured at low cost, and the work of mounting the optical filter can be facilitated.

[Brief description of the drawings]

FIG. 1 is an assembly configuration diagram showing an outline of an example of a plasma display device according to a first embodiment of the present invention.

FIG. 2 shows the X of the plasma display device shown in FIG.
It is the figure which showed a part of -X cut surface.

FIG. 3 is an assembly configuration diagram showing an outline of an example of a plasma display device according to a second embodiment of the present invention.

4 is a view showing Y of the plasma display device shown in FIG.
It is the figure which showed a part of -Y cut surface.

FIG. 5 is a perspective view showing the leaf spring shown in FIGS. 3 and 4 in further detail;

FIG. 6 is a perspective view showing the conductive mesh shown in FIG. 4 in further detail;

FIG. 7 is a cross-sectional view showing a main part of a conventional plasma display device.

[Explanation of symbols]

 Reference Signs List 1 housing, 2 plasma display 3 optical filter 32 conductive thin film 4 double-sided adhesive tape 5 conductive rubber 6 leaf spring

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiromi Kamei 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (6)

[Claims] 1. A housing housing a plasma display unit, providing an opening in the front surface, and having a conductive region on the outer surface side around the opening, an optical filter on which a conductive thin film is formed, and an outer edge of the optical filter. A fixing member for fixing the portion to the outer surface around the opening of the housing, a conductive region of the housing, and a conductive thin film of the optical filter, and electrically connecting the conductive region and the conductive thin film; A plasma display device comprising: an elastic conductive member. 2. The plasma display device according to claim 1, wherein the conductive thin film is formed of a fibrous conductive member arranged in a mesh. 3. The elastic conductive member is made of a conductive rubber having a hollow region inside.
Or the plasma display device according to 2. 4. The method according to claim 1, wherein the conductive thin film has an insulating film, and the elastic conductive member is formed of a metal plate spring having a projection at the tip on the optical filter side. The plasma display device according to the above. 5. The plasma display device according to claim 1, wherein one or more slits are provided in the elastic conductive member, and the elastic conductive members between the slits are independently bent. 6. The fixing member according to claim 1, wherein the fixing member is a double-sided adhesive tape for fixing the rear surface of the outer edge of the optical filter to the outer surface around the opening of the housing. Plasma display device.