JP2001154594A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the interference between external electromagnetic wave leakage and internal signals and to downsize the device. SOLUTION: This plasma display device is constituted by providing the device with a front case 1, a back cover 2 and a shielding plate 3 separating and housing a panel drive circuit and a signal processing circuit in its internal space, providing the side wall parts 10 of the front case 1 with butt parts 20 projecting to the inner side over nearly the entire area thereof, providing only the portions of the butt parts 20 with notched parts 22, providing the inner side of the side wall parts 10 of the front case 1 corresponding to the positions of the notched parts 22 with mounting parts 23 in the positions lower than the butt parts 20, providing the mounting parts 23 of the front case 20 with mounting parts 27 abutting thereon in the state of butting the butt parts 25 of the shielding plate 3 against the butt parts 20 of the front case 1, fastening together the each other's mounting parts 23 and 27 by means of screws 16 in the state of butting the each other's butt parts 20 and 25 against each other and fastening together the each other's butt parts 13 and 20 by means of screws 17 in the state of butting the butt parts 13 of the back cover 2 against each other via the shielding plate 3.

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 including a plasma display panel (PDP), a panel driving circuit, and a signal processing circuit.
In particular, the present invention relates to a shielding technique for preventing leakage of electromagnetic waves to the outside of the device and mutual interference between internal signals.

[0002]

2. Description of the Related Art FIG. 3 is a schematic sectional view of a plasma display apparatus of this kind. In FIG. 3, a plasma display device includes a metal-made front case 1 having an opening 1a on the front side and a frame shape.
And a shielding plate 3 for separating an internal space formed by the rear cover 2 and the front case 1 into a front space and a rear space,
The plasma display panel 4 and the panel drive circuit 6 are accommodated in the front space, and the signal processing circuit 7 is accommodated in the rear space. A front panel 8 is disposed further forward of the front case 1, and a front filter 9 is disposed between the front panel 8 and the front case 1.

The front case 1, the rear cover 2 and the shielding plate 3 are all formed of members having an electromagnetic wave shielding effect, and these members are fixed by electromagnetic waves from the front space and the rear space to the outside of the apparatus. In order to prevent leakage and mutual interference of internal signals between the panel drive circuit 6 in the front space and the signal processing circuit 7 in the rear space, a shield fixing structure is provided.

FIGS. 4A and 4B show a conventional shield fixing structure. 4 (A) and 4 (B), the side wall 10 of the front case 1 is partially provided with a cover butting portion 11 by bending an end of the side wall 10 inward. Is fixed at a position lower than the butting portion 11 for the cover. An abutting portion 13 is provided at an end of the back cover 2 by bending. The end of the shielding plate 3 is formed as a butting portion 14, and a cutout portion 15 is provided at a position of the butting portion 14 corresponding to the cover butting portion 11.

[0005] Then, the butting portion 14 of the shielding plate 3 is brought into contact with the butting portion 12 of the front case 1 from the back side, and a screw is formed between the butting portion 12 of the shielding plate and the butting portion 14. 16 are fastened. The butting portion 13 of the rear cover 2 abuts against the butting portion 11 of the front case 1 from the back side, and the butting portion 11 for the cover and the butting portion 1 are joined.
3 is fastened with a screw 17.

FIGS. 5A and 5B show another conventional shield fixing structure. In FIGS. 5A and 5B,
The side wall portion 10 of the front case 1 is provided with a cover butting portion 11 by bending an end thereof inward, and is lower than the cover butting portion 11 inside the side wall portion 10. The butting part 12 for shielding plates is fixed at the position. Other conventional butting portion 12 for shielding plate
Is set to be longer than that of the conventional example, and is provided so as to protrude inward from the butting portion 11 for the cover. The configuration of the back cover 2 is the same as that of the conventional example,
The notch 11 is not provided in the butting portion 14 in the shielding plate 3 as in the conventional example.

The butting portion 14 of the shielding plate 3 is brought into contact with the butting portion 12 of the front case 1 from the rear side, and a screw is formed between the butting portion 12 of the shielding plate and the butting portion 14. 16 are fastened. The butting portion 13 of the rear cover 2 abuts against the butting portion 11 of the front case 1 from the back side, and the butting portion 11 for the cover and the butting portion 1 are joined.
3 is fastened with a screw 17.

[0008]

However, in the former conventional example, the front case 1 and the rear cover 2 are in contact with a sufficient contact area at the location of the butting portion 11 for the cover. Otherwise, front case 1
Only slightly in contact with the end face 10a of the side wall portion 10 of FIG. Since the abutting portion between the members has a higher shielding effect when the contact area is as large as possible, the conventional example has a problem that the effect of preventing electromagnetic wave leakage is low.

In the latter other conventional example, the abutting area between the front case 1 and the back cover 2 and between the front case 1 and the shielding plate 3 may be sufficiently large over the entire area. Therefore, leakage of electromagnetic waves is effectively prevented. However, the butting portion 14 of the shielding plate 3 is greatly protruded inward, and the screw 17 is fastened at this protruding portion, so that the housing component must be housed inside this portion. In other words, the space S2 between the side wall portion 10 of the front case 1 and the fastening position of the screw 17 is almost a dead space, and there is a problem that the device becomes large.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is possible to effectively prevent leakage of electromagnetic waves to the outside of the device and mutual interference of internal signals, and to reduce the size of the device. It is an object to provide a display device.

[0011]

According to a first aspect of the present invention, there is provided a frame-shaped front case having an opening at a front side, and a rear cover disposed on the back side of the front case and fixed to the case. The interior space formed by the back cover and the front case is separated into a front space in which the plasma display panel and the panel driving circuit are housed and a rear space in which the signal processing circuit is housed, and is fixed to the front case. A plasma display device comprising a shielding plate, wherein the front case, the back cover, and the shielding plate are both formed of members having an electromagnetic wave shielding effect.
A butt portion protruding inward over substantially the entire area is provided on a side wall portion of the front case, and a cut portion is provided in a part of the butt portion, and a side wall portion of the front case corresponding to the position of the cut portion is provided. A mounting portion is provided at a position lower than the butting portion on the inside of the front case, and the mounting portion abuts on the mounting portion of the front case with the butting portion of the shielding plate butting against the butting portion of the front case. A part is provided, and the abutting portions of the shielding plate and the front case are abutted against each other in a state where the abutting portions of the shielding plate and the front case are abutted. The butt portion of the rear cover and the butt portion of the front cover are fastened with a screw in a state where the butt portion is abutted through the shielding plate.

According to a second aspect of the present invention, in the plasma display device according to the first aspect, the butting portion of the front case is formed by bending an end of a side wall of the front case. It is characterized by the following.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show an embodiment of the present invention. FIG. 1A is an exploded perspective view of a shield fixing structure.
1B is a cross-sectional view along the line aa in FIG. 1A, and FIG. 2 is an enlarged cross-sectional view of a main part. 1 and 2, the overall schematic configuration of the plasma display device is the same as that of FIG. 3, and thus the description thereof will be omitted, and only the shield fixing structure will be described.

That is, the butting portion 20 is provided on the side wall portion 10 of the front case 1 by bending its end inward over substantially the entire area. A screw hole 21 is provided at an appropriate position of the butting portion 20, and a cutout portion 22 is provided at an appropriate portion of the butting portion 20. Side wall 1 of front case 1 corresponding to the position of notch 22
0, the mounting portion 23 is located lower than the butting portion 20.
Are fixed by spot welding or the like. The mounting portion 23 is provided with a screw hole 23a (shown in FIG. 2).

At the end of the rear cover 2, a butting portion 13 is provided by bending over substantially the entire area, and the butting portion 13 is provided with a screw insertion hole 24 at an appropriate position.

The end of the shielding plate 3 is formed as a butting portion 25, and the butting portion 25 is provided with a screw insertion hole 26 at an appropriate position. Also, a mounting portion 27 is provided on the front side of the shielding plate 3.
Are fixed by spot welding or the like, and the mounting portion 27 is set so as to abut the mounting portion 23 of the front case 1 with the butting portion 25 of the shielding plate 3 butting against the butting portion 20 of the front case 1. ing. The mounting portion 27 is provided with a screw insertion hole 28 (shown in FIG. 2), and a screw head insertion hole 29 is provided at a location of the butting portion 25 corresponding to the screw insertion hole 28.

When the butting portion 25 of the shielding plate 3 comes into contact with the butting portion 20 of the front case 1 from the back side,
The two mounting portions 23 and 27 are in contact with each other. The screw 16 is inserted from the back side through the screw head insertion hole 29, and the inserted screw 16 is screwed into the screw hole 23a through the screw insertion hole 28, so that the gap between the two butted portions 20, 25 is screwed. 16 are fastened. The butting portion 13 of the back cover 2 is brought into contact with the butting portion 25 of the shielding plate 3 from the back side,
By screwing the screw 17 into the screw hole 21 through the screw insertion holes 24 and 26, the butting portion 11 of the rear cover 2 is screwed into the butting portion 20 of the front case 1 together with the butting portion 25 of the shielding plate 3. Has been concluded.

That is, according to the present invention, the butting portion 25 of the shielding plate 3 and the butting portion 13 of the rear cover 2 are opposed to the butting portion 20 provided substantially over the entire side wall portion 10 of the front case 1. Are arranged in a stacked state, and a necessary and sufficient contact area can be taken over substantially the entire area, so that leakage of electromagnetic waves to the outside of the device and mutual interference of internal signals can be effectively prevented. Further, the shield plate 3 can be fastened with the screw 16 through the notch 22 of the butting portion 20 of the front case 1, and the fastening position of the screw 16 is not located inside the butting portion 20 of the front case 1. As shown in (B), the space S1 between the side wall portion 10 of the front case 1 and the fastening position of the screw 17 is small, and the device can be miniaturized.

In this embodiment, since the butting portion 20 of the front case 1 is formed by bending the end of the side wall 10 of the front case 1, the end of the side wall 10 of the front case 1 is formed. Butt 20 can be created simply by bending,
The butting portion 20 of the front case 1 can be easily formed.

In this embodiment, only the screw 17 for fastening the rear cover 2 protrudes from the rear surface side of the rear cover 2 and the screw 16 for fastening the shielding plate 3 is not exposed. No appearance and good appearance.

[0022]

As described above, according to the first aspect of the present invention, the front case, the back cover disposed on the back side of the front case, and the interior formed by the back cover and the front case. A member that separates a space into a front space in which a panel drive circuit is housed and a rear space in which a signal processing circuit is housed, wherein the front case, the back cover, and the shield plate both have an electromagnetic wave shielding effect. In the plasma display device configured as described above, a butt portion is provided on the side wall portion of the front case so as to protrude inward over substantially the entire area, and a cut portion is provided in a part of the butt portion, and the position of the cut portion is provided. A mounting portion is provided at a position lower than the butting portion inside the side wall portion of the front case corresponding to the front case, and the butting portion of the shielding plate is connected to the butting portion of the front case. A mounting portion is provided for abutting on the mounting portion of the front case in a state where the mounting portions are in contact with each other, and between the mounting portions in a state where the butting portions of the shielding plate and the front case abut against each other. The butting portion of the rear cover and the butting portion of the front cover in a state where the butting portion of the back cover is butted with the butting portion of the front case via the shielding plate. Because the parts are fastened with screws, the butting part of the shielding plate and the butting part of the rear cover are arranged in a stacked state with respect to the butting part provided over almost the entire side wall part of the front case. The contact plate can have a necessary and sufficient contact area over almost the entire area, and the shielding plate can be screwed through the cutout of the butting portion of the front case. Not located further inside , Can be prevented effectively mutual interference of electromagnetic waves leaking and internal signals to the more outside of the apparatus above, it is possible to miniaturize the apparatus.

According to a second aspect of the present invention, in the plasma display device according to the first aspect, the abutting portion of the front case is formed by bending an end of a side wall of the front case. With this configuration, in addition to the effect of the first aspect of the present invention, since the butting portion can be created simply by bending the end of the side wall portion of the front case, it is easy to create the butting portion of the front case.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view of a shield fixing structure according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line aa of FIG. 1A.

FIG. 2 is an enlarged sectional view of a main part of the shield fixing structure according to the embodiment of the present invention.

FIG. 3 is a schematic sectional configuration diagram of a plasma display device.

4A is an exploded perspective view of a shield fixing structure in a conventional example, and FIG. 4B is a cross-sectional view taken along line bb of FIG. 4A.

FIG. 5A is an exploded perspective view of a shield fixing structure in another conventional example, and FIG. 5B is a cross-sectional view taken along the line cc of FIG. 5A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front case 1a Opening 2 Back cover 3 Shielding plate 4 Plasma display panel 6 Panel drive circuit 7 Signal processing circuit 10 Side wall part 13, 20, 25 Butting part 16, 17 Screw 22 Notch part 23, 27 Mounting part

Claims (2)

[Claims] 1. A frame-shaped front case having an opening at a front side, a back cover arranged on the back side of the front case and fixed to the front case, and a back cover and the front case. An internal space separated into a front space in which a plasma display panel and a panel driving circuit are housed and a rear space in which a signal processing circuit is housed, and a shielding plate fixed to the front case. In a plasma display device in which both a rear cover and the shielding plate are made of a member having an electromagnetic wave shielding effect, a butt portion is provided on a side wall portion of the front case so as to protrude inward over substantially the entire area, and the butt portion is A notch is provided in a part of the front case, and the inside of the side wall of the front case corresponding to the position of the notch is provided at a position lower than the abutting portion. A part is provided, and a mounting part is provided which comes into contact with the mounting part of the front case in a state where the butting part of the shielding plate is abutted against the butting part of the front case. With the butting portions of each other butted with each other, the mounting portion of each other is fastened with a screw, and the butting portion of the back cover is connected to the butting portion of the front case via the shielding plate. A plasma display device, wherein a butted portion of the rear cover and the butted portion of the front cover are fastened with screws in a butted state. 2. The plasma display device according to claim 1, wherein the butting portion of the front case is formed by bending an end of a side wall of the front case. Plasma display device.