JP2002006757A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a display device of a thin type which is simplified in a casing as simple as possible, is decreased in the number of parts by reinforcing a rear cover in particular, is lessened in the radiation of disturbing electromagnetic waves and is low in cost. SOLUTION: This display device is constituted by disposing a display unit 2 of a plane type, such as a plasma display, between a front case 4 and the rear cover 5. The display unit 2 has plural bosses 3 which are holding parts for supporting the weight and holding the display unit 2 on the back of the display unit 2 and the rear cover 5 is made of a resin. Plural reinforcing parts 5f which are internally hollow and are continuous nearly over the entire length at the rear in a horizontal direction are formed in the prescribed areas of the rear cover 5. The reinforcing parts 5f are provided with slots 5d which are mounting parts for mounting the display unit 2 so that the display unit 2 is supported and held with the rear cover 5 by fixing the holding parts of the display unit 2 to the mounting parts of the rear cover 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device, and more particularly to a display device, such as a plasma display, which is large and heavy, and has a rear cover having cooling air intake holes and exhaust holes on its back surface. .

[0002]

2. Description of the Related Art The prior art will be described with reference to an exploded perspective view of a display device shown in FIG. The illustrated display device 51 is a large flat display unit 5 such as a plasma display.
2 shows an example in which 2 is mounted on a case 53. A front case 54 is attached to the front of the case 53, and a rear cover 55 is attached to the back of the case 53. The display unit 52 is mounted on the front side of the case 53 by a boss, and a control board and a power supply board (not shown) are mounted on the back side. Case 5
3 has a side wall 53a on the left, right, and lower part of the back surface for mounting a rear cover 55, and a left and right side wall 53a has an intake hole 53b for intake. Protective wire mesh 53c is attached to the left and right intake holes 53b. On the rear cover 55,
It has an intake hole 55a for intake at the lower part of the back and an exhaust hole 55b for exhaust at the upper part.
c, 55d are attached. An exhaust fan (not shown) is mounted inside the exhaust hole 55b, and exhausts heat generated from the display unit 52 and circuit boards such as a control board and a power supply board, thereby cooling the display device 51.

A large and heavy display device 51 such as a conventional plasma display requires a case 53 as a chassis or a frame for supporting the weight of the display unit 52, and the entire device is made thinner accordingly. I couldn't. In particular, when the chassis 53 is used, there is a problem in that the number of parts around the chassis 53 is large, and the assembling requires man-hours. In addition, the power consumption of the display unit 52 is large, and the intake holes 53b and 55a and the exhaust hole 55b for cooling the inside of the apparatus are required. However, a case 53 is provided between the front display unit 52 and the rear cover 55. And it is difficult to secure a ventilation path for heat radiation. Further, the intake holes 53b and 55a and the exhaust hole 55b
And the rear cover 55 and the protective wire meshes 53c, 55c, 55d are respectively attached, so that the number of parts is large, and therefore, the number of assembly steps is increased and the cost is high. Also, in a display device such as a plasma display that performs high-speed signal processing and consumes a large amount of power, a large amount of radiated electromagnetic waves are required, and it is necessary to take EMI measures to suppress this interfering electromagnetic wave. It has been difficult to electrically connect a large number of components such as the case 53, the front case 54, the rear cover 55, the wire meshes 53c, 55c, and 55d, and to take measures against electromagnetic waves. Flat-panel displays are also demanded to be thinner and lighter and to have higher performance, and there has been a demand for a display device having a small number of parts and a low cost of emission of interfering electromagnetic waves.

[0004]

SUMMARY OF THE INVENTION In view of the above-described problems, the present invention simplifies the housing as much as possible, in particular, reinforces the rear cover to reduce the number of parts, and reduces the cost of emission of interfering electromagnetic waves and reduces the cost. It is intended to provide a display device.

[0005]

In order to solve the above-mentioned problems, the present invention provides a flat display unit such as a plasma display, a front case mounted on the front of the display unit, and a rear surface of the front case. A display device comprising a rear cover, wherein the display unit is disposed between the front case and the rear cover,
The display unit includes a plurality of holding portions for supporting the weight and holding the display unit on a back surface of the display unit. The rear cover is made of resin. While forming a plurality of hollow inner reinforcing portions continuous over substantially the entire length of the, the mounting portion for mounting the display unit is provided on the reinforcing portion, the holding portion of the display unit,
By fixing the display unit to the mounting portion of the rear cover, the display unit is supported and held by the rear cover.

[0006] A flat display unit such as a plasma display, a front case mounted on the front of the display unit, and a rear surface of the front case are covered.
A display device comprising a rear cover having an intake hole and an exhaust hole for cooling the device, wherein the display unit is disposed between the front case and the rear cover, wherein the display unit is the display unit. On the back side, a plurality of holding portions for supporting the weight and holding the display unit are provided, and the rear cover includes a wire mesh or metal mesh made of resin and extended to cover the entire inside, At a predetermined portion of the rear cover,
A plurality of hollow inner reinforcing portions that are continuous over substantially the entire length of the rear surface in the horizontal direction are provided, and an attachment portion for attaching the display unit is provided on the reinforcing portion, and the holding portion of the display unit is attached to the rear cover. By fixing the display unit to the mounting portion, the display unit is supported and held by the rear cover.

[0007] The reinforcing portion may have a rib inside a hollow.

[0008] The rear cover or the front case contains carbon fiber in a resin.

The holding section is composed of a plurality of blocks arranged at least vertically, which are arranged substantially on the same line in the horizontal direction.

The holding portion is a metal boss having a screw hole, the mounting portion is an insertion hole for inserting a mounting screw, and the mounting screw is used to screw the holding portion and the mounting portion. Put on and fix.

The front case has a grounding member inside the side surface of the front case, and the grounding member is formed so as to cover the outer periphery of the front case.

A projection is provided at a predetermined portion on the back surface of the resin of the rear cover, and the wire mesh or metal mesh is welded at the tip of the projection, and between the resin and the wire mesh or metal mesh, A predetermined space was provided.

[0013] The protrusion is formed in a rib shape that is long in the vertical or horizontal direction.

At least a part of the wire mesh or metal mesh is provided with a conductive portion having good electrical conductivity, and the conductive portion is connected to the ground of the apparatus when the rear cover is mounted.

The conducting portion is a peripheral portion of a through hole for a mounting screw provided around the wire mesh or the metal mesh.
The connection with the ground of the device was made by screwing the mounting screw.

The conducting portion is an end around the wire mesh or the metal mesh, and the end and the end of the earth member on the front case side are brought into contact with each other to conduct with the earth of the apparatus. .

The wire mesh or metal mesh is made of aluminum,
It is made of either aluminum alloy or stainless steel.

[0018]

FIG. 1 is an exploded perspective view of an embodiment of a display device according to the present invention. Description will be made based on the drawings. The display device 1 of the present invention is configured such that a front case 4 is mounted on a front surface of the display unit 2 and a rear cover 5 is mounted on a rear surface of the front case 4 with the display unit 2 as a center. Although not shown, a drive circuit board for driving the display unit 2, a control board for controlling the device, a power supply board for supplying power, and the like are mounted on the back surface of the display unit 2. . Further, metal bosses 3 as holding portions for attaching the display unit 2 to the housing and supporting and supporting the weight are dispersedly arranged at predetermined positions. In the example shown in the figure, bosses 3 are arranged at four locations in the horizontal direction at the upper and lower portions of the back surface of the display unit 2 and at two locations on the left and right at the center. The boss 3 is made of a cylindrical metal, and has a screw hole for a mounting screw at a cylindrical axis. These bosses 3 on the back of the display unit 2 are
Are screwed with mounting screws 8 through insertion holes 5d, which are mounting portions provided at corresponding positions, so that the weight is supported and held by the rear cover 5.

The rear cover 5 is formed of a resin, but in order to support the weight of the display unit 2, the rear cover 5 is provided at a position corresponding to the boss 3 of the display unit 2 so as to extend horizontally over substantially the entire length of the rear surface as shown by a broken line. A hollow reinforcing portion 5f is integrally formed. The internal hollow reinforcing portion 5f is provided at the upper portion and the central portion inside the rear cover 5 corresponding to the position of the boss 3 of the display unit 2, respectively. The reinforcing portion 5f at the lower portion of the rear cover 5 is formed so as to be thick so as to support the entire weight. The left and right sides of the rear cover 5 and the lower part of the rear face are provided with intake holes 5
a, 5b, and an upper part has an exhaust hole 5c, and a wire mesh 6 for protecting each is integrally formed on the inner side surface of the resin. The rear cover 5 is molded by an in-mold molding technique so as to cover the entire inside of the rear surface of the rear cover 5 integrally with resin and metal. Front case 4
A cylindrical metal boss 4a having a screw hole at the axis is provided at a predetermined portion around the boss, and an insertion hole 5 is provided around the rear cover 5 at a portion corresponding to the boss 4a.
d is provided, and the front case 4 and the rear cover 5 are attached by the attachment screws 8.

FIG. 2 is an exploded perspective view for explaining the structure of the rear cover. The rear cover 5 has intake holes 5a and 5b for intake at the left, right, and lower rear, and has an exhaust hole 5c for exhaust at the upper rear, and is formed of resin. A protective wire mesh 6 or a metal mesh is integrally formed inside the rear cover 5, but the wire mesh 6 is extended and formed so as to cover the entire inside of the rear cover 5 as shown in the figure. For this reason, the entire rear side of the rear cover 5 is shielded by the wire mesh 6, and the radiation of unnecessary interference radio waves from the rear cover 5 can be reduced. The protective wire mesh 6 is connected to the ground of the display device 1, and a specific method will be described later.

The wire mesh 6 is formed in a substantially trapezoidal shape so that the central portion of the wire mesh 6 is expanded from the peripheral portion along the inner side surface of the rear cover 5. The rear cover 5 is formed in a trapezoidal shape in which a central portion of the rear surface is swelled, in order to efficiently house a drive circuit board, a control board, a power supply board, and the like of the display unit 2 therein. Also, it is to take in the intake air from the intake holes on the left and right side surfaces of the rear cover 5. The intake holes 5a and 5b and the exhaust holes 5c of the display device 1 are all integrated in the rear cover 5, so that the entire device can be made thinner. At the periphery of the rear cover 5 and the wire mesh 6, through holes 5d and 6a for mounting screws are formed, respectively.

FIG. 3 is a sectional view of an essential part for explaining a mounting structure of the display device. An internal hollow reinforcing portion 5f is formed at a predetermined portion of the rear cover 5 corresponding to the boss 3 provided on the display unit 2. In the illustrated example, a plurality of hollow portions are formed in the upper reinforcing portion 5f. The reinforcing portion 5f at the lower portion of the rear cover 5 is formed to have a wider width and an increased number of hollow portions, but the lower reinforcing portion 5f supports the weight of the device. The hollow portion is formed by a molding method such as a gas injection molding method or a high hollow molding method, and the strength is secured by increasing the overall thickness. According to the gas injection molding method, it is possible to integrally mold a specific portion of the resin to be hollow, and it is also possible to prevent sink marks due to differences in resin thickness in appearance, and according to the high hollow molding method, it is possible to form a hollow portion. The ribs can be integrally molded inside to increase the strength. Further, the front case 4 or the rear cover 5 is made of a resin made of carbon fiber.
By containing up to 50% by weight, the strength can be further increased. This is effective for a large and heavy plasma display.

The rear cover 5 has a projection 5e at an important point inside the rear surface, and holds a protective wire mesh 6 by welding at the tip of the projection 5e. For this reason, a predetermined space is maintained between the resin on the back surface and the protective wire mesh 6 according to the length of the protrusion 5e, and a space is formed. By providing a space between the wire netting 6 and the resin, the overall mechanical strength of the rear cover 5 is improved as compared with the case where the metal mesh 6 and the resin are adhered to each other. Further, in this case, the strength can be maintained even when the resin other than the reinforcing portion is thinned and molded, so that the overall weight can be reduced. As described above, only a predetermined portion to which the weight for supporting the display unit 2 is added is reinforced by providing the internal hollow reinforcing portion 5f, and directly without using a frame or a chassis for holding the display unit 2. Since it is supported by the rear cover 5, the number of parts can be reduced and the cost can be reduced. In addition, the portion where the strength is not added is formed so that the thickness of the resin is reduced, thereby reducing the weight.

A heat radiating fan 7 is mounted inside the exhaust hole 5c above the rear cover 5. The air sucked from the lower intake hole 5b is exhausted from the upper exhaust hole 5c. At the peripheral end of the rear cover 5, an insertion hole 5d for a mounting screw 8 for mounting to the front case 4 is provided.
It is screwed to a metal boss 4 a mounted on the front case 4 with a mounting screw 8. The wire mesh 6 includes a conductive portion having good electrical conductivity at least in part, and the conductive portion is connected to the ground of the apparatus when the rear cover 5 is mounted. The conductive portion is a peripheral portion of the insertion hole 6a for the mounting screw 8 provided in the peripheral portion of the wire mesh 6, and is electrically connected to the ground of the apparatus by screwing the mounting screw 8. That is, the periphery of the insertion hole 6a of the wire mesh 6 is not subjected to a process such as painting to reduce the electric resistance, and the wire mesh 6 is screwed into the metal mesh 6 via the metal boss 4a by the screwing of the mounting screw 8, thereby grounding the inside of the front case 4. It is ensured that it is electrically connected to the member 4b.

The end of the ground member 4b is bent rearward along the end of the front case 4, and further bent inward so as to have a substantially U-shape in cross section. When the rear cover 5 is attached to the front case 4, the end of the wire mesh 6 comes into contact with the end of the ground member 4b, so that electrical contact is further ensured. A filter 4c provided with an electromagnetic protection measure formed of a resistive film or the like is mounted on the front surface of the front case 4 so as to be in contact with a ground member 4b around the front case 4. Earth member 4b
And the wire net 6 are electrically connected to each other and have the same potential as the ground of the device, so that it is possible to reduce the electromagnetic interference generated from inside the device. The ground member 4b is formed so as to cover the entire outer periphery of the front case 4, and is electrically connected to the front filter 4c, the ground member 4b, and the wire mesh 6 of the rear cover 5, thereby ensuring more reliable radio wave measures. It is assumed. In particular, the number of parts is small, and therefore the number of connection parts is small, so that more effective measures can be taken. Particularly, almost the entire surface of the rear cover 5 is covered with a relatively thick wire mesh 6 or metal mesh, and the ground member 4b on the outer periphery of the front case 4 is covered with metal such as aluminum, so that the thickness of the conductive paint or conductive film is limited. With,
A more effective countermeasure against electromagnetic interference can be taken as compared with a countermeasure against radio waves with insufficient electrical resistance. As described above, since the shield structure is formed mainly of metal, expensive measures such as conductive treatment of conductive paint and resin are not required, and the cost can be reduced.

FIG. 4 is a top view for explaining the opening of the wire mesh in this embodiment. Wire mesh 6 has a thickness of 0.5 mm,
The projected size of the opening is a square hole of 2 mm × 2 mm, and the interval between the openings is 0.5 mm. By making the shape of the projection from the upper surface into a substantially square shape, the aperture ratio is maximized, and the shape has a good heat radiation effect. The opening applied to the upper exhaust hole 5c may be a different opening having a different size in accordance with a safety standard for protecting insertion of a finger or the like. For example, the opening ratio can be further increased by increasing the square hole of the opening to 5 mm × 5 mm without changing the interval between the openings, so that efficient exhaust can be performed. In this embodiment, a wire mesh is used for protecting the intake hole and the exhaust hole. However, a metal mesh has the same effect. The shape is not limited to punching, and a metal wire may be used. The material is also a material having good conductivity, for example, copper, copper alloy, aluminum, aluminum alloy, stainless steel, etc., but aluminum or aluminum alloy is suitable in terms of light weight, and stainless steel is suitable in terms of strength and rust prevention.

[0027]

As described above, the present invention comprises a flat display unit such as a plasma display, a front case mounted on the front of the display unit, and a rear cover covering the back of the front case. A display device having a display unit disposed between a case and a rear cover, wherein the display unit includes a plurality of holding portions for supporting weight and holding the display unit on a back surface of the display unit, and the rear cover is made of resin. And a plurality of hollow inner reinforcing portions that are continuous over substantially the entire length of the rear surface in a predetermined direction of the rear cover, and a mounting portion for mounting a display unit is provided on the reinforcing portion, and the display unit is held. The display unit is supported and held by the rear cover by fixing the part to the mounting part of the rear cover. It can be as simple as possible a housing, in particular to reduce the number of parts to reinforce the rear cover, to provide a radiation less cost cheaper thin display device electromagnetic interference.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a display device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view for explaining a structure of a rear cover in the display device of the present invention.

FIG. 3 is an essential part cross-sectional view for explaining a structure of a rear cover in the display device of the present invention.

FIG. 4 is a top view for explaining an opening of a wire net in the display device of the present invention.

FIG. 5 is an exploded perspective view of an example of a conventional display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Display unit 3 Boss 4 Front case 4a Boss 4b Ground member 5 Rear cover 5a, 5b Intake hole 5c Exhaust hole 5d, 6a Insertion hole 5e Projection body 5f Reinforcement part 6 Wire mesh 7 Fan 8 Mounting screw

Claims (13)

[Claims] 1. A flat display unit such as a plasma display, a front case mounted on a front surface of the display unit, and a rear cover covering a back surface of the front case, wherein a space between the front case and the rear cover is provided. A display device provided with the display unit, wherein the display unit includes a plurality of holding portions for supporting a weight and holding the display unit on a back surface of the display unit, and the rear cover is made of resin. In a predetermined portion of the rear cover, while forming a plurality of hollow inner reinforcing portions that are continuous over substantially the entire length of the rear surface in the horizontal direction, an attaching portion for attaching the display unit is provided on the reinforcing portion, By fixing the holding portion of the display unit to the mounting portion of the rear cover, the display unit can be moved forward. A display device supported and held by a rear cover. 2. A flat display unit such as a plasma display, a front case mounted on a front surface of the display unit, an intake hole and an exhaust hole for covering the back surface of the front case and cooling the device. A display device, comprising a rear cover having the display unit, wherein the display unit is disposed between the front case and the rear cover, wherein the display unit supports the display unit on the back surface of the display unit while supporting weight. A plurality of holding portions for holding, the rear cover is made of resin and includes a wire mesh or metal mesh extending so as to cover the entire inside,
A predetermined portion of the rear cover, a plurality of hollow inner reinforcing portions that are continuous over substantially the entire length of the back surface in the horizontal direction, and an attachment portion for attaching the display unit is provided on the reinforcing portion; The display device, wherein the display unit is supported and held by the rear cover by fixing the holding portion to the mounting portion of the rear cover. 3. The display device according to claim 1, wherein the reinforcing portion has a rib inside a hollow. 4. The display device according to claim 1, wherein the rear cover or the front case contains carbon fiber in a resin. 5. The display device according to claim 1, wherein the holding unit is composed of a plurality of blocks arranged at least vertically, which are arranged substantially on the same line in the horizontal direction. 6. The holding portion is a metal boss having a screw hole, the mounting portion is an insertion hole for inserting a mounting screw, and the mounting screw is used to connect the holding portion to the mounting portion. The display device according to claim 1, wherein the display device is fixed by screwing. 7. The front case includes a ground member inside a side surface of the front case.
7. The display device according to claim 1, wherein the display device is formed so as to cover an outer periphery of the front case. 8. A projection is provided at a predetermined portion on the back surface of the resin of the rear cover, and the wire mesh or the metal mesh is welded at the tip of the projection, and a gap is formed between the resin and the wire mesh or the metal mesh. 8. The display device according to claim 2, wherein a predetermined space is provided in the display device. 9. The display device according to claim 8, wherein the protrusion is formed in a vertically or horizontally long rib shape. 10. The wire mesh or metal mesh is provided with a conductive portion having good electrical conductivity at least in part, and when the rear cover is attached, the conductive portion is connected to the ground of the device. 10. The display device according to claim 2, wherein: 11. The conductive portion is a peripheral portion of an insertion hole for a mounting screw provided around the wire mesh or the metal mesh, and is electrically connected to the ground of the device by screwing the mounting screw. The display device according to claim 10, wherein: 12. The conductive portion is an end portion around the wire mesh or the metal mesh, and the end portion is in contact with an end portion of the ground member on the front case side to conduct with the ground of the device. The display device according to claim 10, wherein: 13. The display device according to claim 2, wherein the wire net or the metal mesh is formed of any one of aluminum, an aluminum alloy, and stainless steel.