WO2014042212A1

WO2014042212A1 - Shield-anchoring structure and thin display device

Info

Publication number: WO2014042212A1
Application number: PCT/JP2013/074686
Authority: WO
Inventors: 則行渋谷; 好久野口; 良治横井
Original assignee: シャープ株式会社
Priority date: 2012-09-14
Filing date: 2013-09-12
Publication date: 2014-03-20
Also published as: JP2015053460A

Abstract

Provided is a technology whereby an electroconductive nonwoven fabric which is attached to a shield plate can easily be positioned, and the attachment precision can be improved. A worker holds an electroconductive fabric (70) and inserts a protruding part (40) of a shield plate (30) such that the protruding part is ensnared by an engagement hole (76) of the electroconductive cloth (70). Then, the worker attaches the central part of the fabric main body (72) to the base portion of the protruding part (40) of an end-part back surface (36b) by means of double-sided tape in the center of the fabric main body. At this time, positioning can be performed suitably due to the existence of a regulating part (42). Next, the surface of the electroconductive fabric (70) is aligned with the end-part back surface (36b) of the shield end part (36), and the double-sided tape at both ends thereof is attached to the end-part back surface (36b).

Description

Shield fixing structure and thin display device

The present invention relates to a shield fixing structure and a thin display device having such a shield fixing structure.

Generally, it is an important matter in product design to stably contact and fix the shield (shield plate) and the backlight chassis to suppress unwanted radiation.

As this type of technology, there is known a fixing structure of a sheet metal member that can fix the sheet metal member to a mounted member such as a chassis without using screws (for example, see Patent Document 1). With this technique, the work burden in the work of fixing the shield plate that hits the sheet metal member and the backlight chassis is reduced.

By the way, the end of the shield plate varies from member to member, and is not necessarily in a stable and reliable state. Therefore, as shown in the fixing structure between the backlight shield 920 and the shield plate 930 in FIG. 1 and the cross-sectional shape of the fixing portion in FIG. 2, the operator uses the non-woven fabric 970 having conductivity and flexibility as the shield end 936. Hand-pasted in freehand. By using such a structure, it is possible to absorb the contact variation of the backlight shield 920 of the rigid member as well as the shield end portion 936 of the rigid member. That is, the electrical connection between the backlight shield 920 (backlight chassis) and the shield plate 930 is reliably maintained.

JP 2011-3713 A

However, since the above-described pasting work is a freehand work by the operator, deviation and wrinkle may occur due to variations in the work, and depending on the accuracy of the pasting, there is a possibility that the work may be repeated. In addition, since the adhesive of the double-sided tape deteriorates because it is not mechanically fixed, it is assumed that peeling / dropping occurs and the effect of radiation countermeasures is significantly reduced.

In the technique disclosed in Patent Document 1, there is a disclosure regarding a direct fixing structure for fixing the shield plate and the backlight chassis, but there is no disclosure about the technique for interposing the nonwoven fabric, and another technique is required. It was.

The present invention has been made in view of the above situation, and an object thereof is to provide a technique for solving the above problems.

The shield fixing structure of the present invention is provided on a metal plate having a shielding function, and is a fixing part fixed to a fixed member, and a cloth-like or sheet-like shape arranged between the fixing part and the fixing member. A conductive member, the conductive member has a locking opening, and the fixing member has a locking portion that locks with the locking opening of the conductive member.
In addition, a concave shape is formed on the back surface side of the fixed portion, and when the conductive member is disposed, a space surrounded by the concave shape and the conductive member is a shield plate. The inside and outside may be communicated.
In the fixing portion, a plurality of openings may be formed in a region where the conductive member is disposed.
The thin display device of the present invention has the above-described shield fixing structure.
Further, the size of the display panel may be 80 inches or more.

According to the present invention, it is possible to easily position the conductive nonwoven fabric to be attached to the shield plate and provide a technique for improving the pasting accuracy.

It is a figure which shows the fixed structure of the backlight shield and shield board based on background art. It is a figure which shows the cross-section of the fixing | fixed part of a backlight shield and a shield board based on background art. It is the figure which showed the fixation structure of the backlight shield and shield board based on 1st Embodiment. It is a perspective view of the shield board based on 1st Embodiment. It is a figure which shows the electrically conductive cloth based on 1st Embodiment. It is a figure which shows the shield board and electrically conductive cloth before fixation based on 1st Embodiment. It is a figure which shows the shield board and electrically conductive cloth after fixation based on 1st Embodiment. It is a figure which pays attention to a shield edge and a shield board and conductive cloth concerning a 1st embodiment especially. It is a figure which shows the shield board and electrically conductive cloth before fixation based on 2nd Embodiment. It is a figure which shows the shield board and electrically conductive cloth after fixation based on 2nd Embodiment. It is a figure which shows the shield board and electrically conductive cloth before fixation based on 3rd Embodiment. It is a figure which shows the shield board and electrically conductive cloth after fixation based on 3rd Embodiment. It is a perspective view of the shield board based on 4th Embodiment. It is a figure which shows the shield board and electrically conductive cloth before fixation based on 4th Embodiment. It is a figure which shows the shield board and electrically conductive cloth after the fixation based on 4th Embodiment. It is a figure which shows the shield board and electrically conductive cloth after the fixation based on 5th Embodiment. It is a figure which shows the shield board and electrically conductive cloth after the fixation based on 6th Embodiment. It is a front view of the liquid crystal television based on 1st Embodiment. It is the disassembled perspective view seen from the back side of the liquid crystal television based on 1st Embodiment. It is a figure which shows the display panel back surface for demonstrating the subject of the large sized liquid crystal television based on 5th Embodiment.

Next, modes for carrying out the present invention (hereinafter simply referred to as “embodiments”) will be specifically described with reference to the drawings.

<First Embodiment>
FIG. 18 is a front view of the liquid crystal television 10 according to the present embodiment. FIG. 19 is an exploded perspective view seen from the back side of the liquid crystal television 10. As shown in the drawing, the liquid crystal television 10 has a front outer peripheral portion of a display panel 11 covered with a frame-shaped front cabinet 12. The rear side of the display panel 11 is covered with a rear cabinet 13. The back surface of the display panel 11 is a backlight chassis (backlight shield 20).

FIG. 3 is a view showing a fixing structure between the backlight shield 20 and the shield plate 30. This fixing structure is provided in a thin display device such as the liquid crystal television 10. FIG. 4 is a perspective view of the shield plate 30.

As can be seen in FIG. 4, the shield plate 30 is a part obtained by processing a metal or other conductive member into a sheet metal. The shield end portion 36 of the shield plate 30 is formed on a plane, and is in contact with and fixed to the backlight shield 20. That is, the shield end portion 36 functions as a fixing portion for the backlight shield 20 that is a fixed member. A conductive cloth 70 is provided between the backlight shield 20 and the shield end 36.

The shield end portion 36 of the shield plate 30 is formed with a protruding portion 40 extending outward from the approximate center in the width direction (vertical direction in FIG. 3). The protrusion 40 has a key-shaped restricting portion 42 whose tip is bent in the vertical direction.

FIG. 5 is a view showing the conductive cloth 70. Conventionally, a conductive cloth 970 having a simple rectangular shape has been used as shown in FIG. However, the conductive cloth 70 of the present embodiment is not a mere rectangular shape, but has a frame-like locking portion 74 extending laterally from one side surface at a substantially central portion in the longitudinal direction (vertical direction in the drawing). Is formed. The inside of the frame portion of the locking portion 74 is a locking opening 76 that locks to the protrusion 40 provided on the shield plate 30. Further, on the surface side of the conductive cloth 70, double-sided tape 78 is attached to both end portions and the center portion of the cloth main body 72. Instead of the conductive cloth 70, a conductive member such as a conductive sheet or a conductive gasket may be used.

Here, FIG. 6A is a plan view (top view) showing the shield plate 30 and the conductive cloth 70 before fixing, and FIG. 6B shows a side view. FIG. 7A is a plan view (top view) showing the shield plate 30 and the conductive cloth 70 after being fixed, and FIG. 7B is a side view. 8 shows the shield end portion 36 and the conductive cloth 70 after being fixed, FIG. 8A is a view showing the front surface (end surface 36a) side, and FIG. It is the figure which showed the edge part back surface 36b) side.

When the shield plate 30 and the conductive cloth 70 are fixed, the worker holds the conductive cloth 70 and inserts the protruding portion 40 of the shield plate 30 so as to be hooked on the locking opening 76 of the conductive cloth 70. Then, the operator attaches the central portion of the cloth main body 72 to the root portion of the protruding portion 40 of the end back surface 36b with the central double-sided tape 78. At this time, proper positioning is facilitated by the presence of the restricting portion 42.

Then, the surface of the conductive cloth 70 is aligned with the end back surface 36b of the shield end 36, and the double-sided tape 78 at both ends is attached to the end back surface 36b. Here, in the vicinity of the end of the shield end 36 in the width direction, three marks 38 for positioning are formed in a slightly convex shape at each end. Further, a circular confirmation opening 39 is formed at the center thereof. Both ends of the conductive cloth 70 are attached with a double-sided tape 78 so as to cover the confirmation opening 39 with the mark 38 as a positioning mark. Then, it can be determined whether the conductive cloth 70 is properly fixed by the confirmation opening 39.

By adopting the above configuration, it is possible to improve the accuracy of the work of attaching the conductive cloth 70 to the shield plate 30. That is, when the locking opening 76 is locked to the protrusion 40, a large positional deviation does not occur. In particular, misalignment prevention at the center portion in the width direction of the conductive cloth 70 is achieved.

Further, the presence of the mark 38 and the confirmation opening 39 prevents the end portion from being displaced.
Furthermore, the confirmation opening 39 can surely confirm the attachment of the conductive cloth 70. In addition, since the protrusions 40 can be locked, it is not necessary to provide the double-sided tape 78 on the entire surface of the conductive cloth 70. Or even if it is provided on the entire surface, it is not necessary to increase the adhesive strength of the double-sided tape 78.

Further, even when the adhesive strength is reduced due to aging, the conductive cloth 70 is dropped from between the shield plate 30 and the backlight shield 20 because the locking opening 76 is locked to the protrusion 40. Can be prevented. In particular, in recent years, the size of the liquid crystal television 10 has been increased, and products having a screen size of 80 inches have been put on the market. Such a large-sized liquid crystal television 10 is easily bent due to the large size of various components. Since such a deflection is small in the conventional size, it is not necessary to consider the dropping of the conductive cloth 70. However, in the large television as described above, it can be assumed that the bending force of the conductive cloth 70 between the backlight shield 20 and the shield plate 30 decreases when the adhesive force decreases due to such bending. Accordingly, by adopting a locking structure such as appropriate fixing of the conductive cloth 70, in particular, fixing of the protrusion 40 and the locking opening 76, it is possible to effectively prevent the dropout.

<Second Embodiment>
FIG. 9 is a view showing the shield plate 130 and the conductive cloth 70 before fixing according to the present embodiment. FIG. 10 is a view showing the shield plate 130 and the conductive cloth 70 after being fixed. The point that the conductive cloth 70 is attached to the end back surface 136b is the same. Here, the points different from the first embodiment are shown and described.

In the shield plate 130 of the present embodiment, a plurality of openings 150 are formed in a portion where the conductive cloth 70 of the shield end 136 is attached. Here, eight openings 150 are formed in a row in each of an upper portion and a lower portion as shown in the figure from the region where the protrusion 140 (the restricting portion 142) is formed. Note that the position where the opening 150 is formed is a position unrelated to the adhesion of the double-sided tape 78 of the conductive cloth 70. In addition, since the fixing of the conductive cloth 70 can be confirmed from the end surface 136a side by the opening 150, the confirmation opening 39 of the first embodiment is omitted.

According to the present embodiment, it is possible to realize the weight reduction by providing the opening 150 together with the same effect as the first embodiment. Note that the shape, number, size, and the like of the opening 150 can be selected as appropriate.

<Third Embodiment>
FIG. 11 is a view showing the shield plate 230 and the conductive cloth 270 before fixing according to the present embodiment. 12 is a view showing the shield plate 230 and the conductive cloth 270 after being fixed, FIG. 12 (a) is a plan view, and FIG. 12 (b) is a cross-sectional view taken along line A1-A1 of FIG. 12 (a). FIG. This embodiment is a further modification of the second embodiment, and here, mainly different points will be illustrated and described.

As shown in the figure, an insertion opening 255 is formed in the vicinity of the positioning mark 238 of the shield end 236, more specifically at a position closer to the center in the width direction. In the insertion opening 255, the end 279 of the conductive cloth 270 is inserted from the end back surface 236b side to the end surface 236a side. That is, both end portions 279 of the conductive cloth 270 are disposed on the end surface 236a.

Similarly to the first embodiment, the conductive cloth 270 includes a locking portion 274, a locking opening 276, and a double-sided tape 278 at the center in the width direction. However, the double-sided tape 278 in the vicinity of the end portion 279 of the cloth main body 272 does not need a portion that protrudes to the end surface 236a. It is provided on the (regulator 242) side.

By adopting such a configuration, the conductive cloth 270 can be fixed more reliably. Note that a double-sided tape 278 may be provided on the back side of the end portion 279 and fixed to the end surface 236a. Although the opening 250 is provided here, a configuration in which the opening 250 for insertion is added to the configuration in which the opening 250 is not provided, that is, the configuration of the first embodiment may be used.

<Fourth Embodiment>
FIG. 13 is a perspective view of the shield plate 330 of the present embodiment. FIG. 14 is a view showing the shield plate 330 and the conductive cloth 70 before fixing, FIG. 14 (a) is a plan view, and FIG. 14 (b) is a side view. 15 is a view showing the shield plate 330 and the conductive cloth 70 after being fixed, FIG. 15 (a) is a plan view, and FIG. 15 (b) is a side view.

Here, different points from the first embodiment are shown and described. In the present embodiment, there is provided a drawn portion 350 in which a portion of the shield end portion 336 where the double-sided tape 78 is not attached is convex toward the end surface 336a by drawing. That is, it is formed in a concave shape when viewed from the end rear surface 336b side.

Also, a ventilation opening 360 is formed at a boundary portion between the shield end 336 and the shield wall surface 338 bent perpendicularly thereto. The ventilation opening 360 is formed at a position corresponding to at least a portion where the throttle part 350 is formed.

Then, as shown in FIG. 15B, when the conductive cloth 70 is inserted into the protruding portion 340 (the restricting portion 342) and fixed to the end back surface 336b, the continuous portion surrounded by the throttle portion 350 and the conductive cloth 70 is provided. A ventilation hole 358 that is a passage is formed.

With such a configuration, the inside and outside of the shield plate 330 can effectively dissipate heat from the board (components) disposed inside the shield plate 330 by the ventilation openings 360 and the vents 358. Moreover, since the temperature rise of the area | region of the double-sided tape 78 can be suppressed, the fall of adhesive force can be suppressed.

It should be noted that a structure similar to the opening 150 of the second embodiment may be adopted for the portion of the throttle portion 350. Moreover, the edge part process of the electrically conductive cloth 270 by the opening 255 for insertion of 3rd Embodiment may be employ | adopted.

<Fifth Embodiment>
In general, as shown in FIG. 20, as the panel size of the liquid crystal television 10 increases, the exposed portion Z1 of the backlight shield 20, that is, the region that is not reinforced is increased. The width of the liquid crystal television 10 for each panel size is as follows.
(1) 52 inches ... about 130cm
(2) 60 inches ... about 140cm
(3) 80 inches ... about 185cm

On the other hand, the thickness of the liquid crystal television 10 is at a level where there is substantially no difference due to the progress of thinning technology. That is, as the panel size increases, distortion tends to occur due to the structure. Moreover, it is not realistic to add a reinforcing frame from the viewpoint of weight reduction and thickness reduction. In this state, the backlight shield 20 and the shield plate 30 may be unstable. According to the first to fourth embodiments, a certain effect with respect to fixing stability was obtained. However, in both the backlight shield 20 and the shield plate 30, when the error upper limit is reached, instability may become significant. This can be avoided if the tolerance is set strictly, but it may be difficult from a cost standpoint. For this reason, in the manufacturing process, work efficiency may be reduced in order to ensure reliable fixation. Such a problem has been raised from the manufacturing site from the 60-inch class, and in the 80-inch class, there has been a strong demand for countermeasure technology. Therefore, in the embodiment described below, the gasket 470 is used as the conductive member.

FIG. 16 is a perspective view of the shield plate 430 of the present embodiment. 16A shows the shield plate 430 before the gasket 470 is fixed, and FIG. 16B shows the shield plate 430 after the gasket 470 is fixed. In the present embodiment, unlike the above-described embodiment, a configuration using a gasket 470 as a conductive member is illustrated. Since the basic configuration of the shield plate 430 is the same, differences will be mainly described.

In the shield plate 430, a gasket 470 is disposed at a shield end 436 that bends and extends perpendicularly from the shield wall 438 instead of the conductive cloth 70 and the like. Specifically, the shield end 436 is configured by a three-part configuration, that is, a central shield end center 436A and two shield end sides 436B on both sides.

The shield end center 436A is formed at a position offset by a predetermined amount from the shield end side 436B to the lower side in the figure. Therefore, the predetermined amount of gap is formed at the boundary portion between the shield end portion center 436A and the shield end portion side 436B.

At the center of each shield end side 436B, a locking piece 460 that is punched out by sheet metal processing or the like and bent downward is formed.

Also, a protrusion 440 having a predetermined width that is bent upward is formed at the center extending outer edge of the shield end center 436A. When the gasket 470 is disposed, the protrusion 440 functions as a restriction wall that abuts against the side wall of the gasket 470 and restricts movement.

The gasket 470 has a plate shape (a rectangular parallelepiped) as illustrated. The length is substantially the same as the length of the shield end 436. The width of the gasket 470 is set to be narrower than the width of the shield end portion 436 (the amount of extension from the shield wall portion 438). The thickness of the gasket 470 is substantially the same as the gap (predetermined amount) between the shield end portion center 436A and the shield end portion side 436B.

On both sides of the gasket 470, a locking opening 476 penetrating vertically is formed at a position corresponding to the locking piece 460 described above.

When the gasket 470 is disposed on the shield end 436, the central portion of the gasket 470 is placed on the shield end center 436A, and both end portions are submerged under the shield end side 436B. At this time, the locking piece 460 is fitted into the locking opening 476 and positioning is performed.

With such a configuration, even when the gasket 470 is used instead of the conductive cloth, the conductive member (gasket 470) can be prevented from falling off, and at the same time, the sealing performance can be ensured.

Further, the gasket 470 has higher rigidity than the conductive cloth, and when placed on the shield plate 430, the shape of the shield plate 430 is easily stabilized. That is, distortion can be reduced, and design errors can be set easily. As a result, it becomes easy to ensure the stability of fixing between the shield plate 430 and the gasket 470, and the workability at the time of manufacture is improved. In particular, from the viewpoint of improving workability, it becomes remarkable when the panel size is 80 inches or more.

<Sixth Embodiment>
FIG. 17 is a perspective view of the shield plate 530 of the present embodiment. FIG. 17A shows the shield plate 530 before the gasket 570 is fixed, and FIG. 17B shows the shield plate 530 after the gasket 570 is fixed.

In the present embodiment, as in the fifth embodiment, a configuration using a gasket 570 as a conductive member is illustrated. Since the basic configuration of the shield plate 530 is the same, differences will be mainly described.

The gasket 570 has a certain rigidity. Unlike the conductive cloth 70, the shape is not deformed unless an external force is applied. Therefore, the extension amount of the shield end portion center 536A extending from the shield wall portion 538 is approximately halved. The protrusion 540 is engaged with an engagement opening 576 formed at the center of the gasket 570.

On the other hand, two regulating pieces 560 for locking the movement of the gasket 570 are formed at both ends of the shield end side 536B. The gasket 570 is in contact with both sides of the gasket 570.

The present invention has been described based on the embodiments. This embodiment is an exemplification, and it is understood by those skilled in the art that various modifications can be made to combinations of the respective components and the like, and such modifications are within the scope of the present invention. For example, the shape, number, position, and the like of the protruding portion 40, the locking portion 74 of the conductive cloth 70, the locking opening 76, and the like can be selected as appropriate.

10 LCD TV 11 Display panel 12 Front cabinet 13 Rear cabinet 20 Backlight shield (fixed member)
30, 130, 230, 330, 430, 530

Shield plate

36, 136, 236, 336, 436, 536 Shield end (fixed portion)
36a, 136a, 236a, 336a

End surface

36b, 136b, 236b, 336b End back

surface

38, 238 Mark 39 Opening for

confirmation

40, 140, 240, 340, 440, 540

Protruding part

42, 142, 242, 342 Restricting

part

70, 270

Conductive cloth

72, 272

Cloth body

74, 274

Locking part

76, 276 Locking opening 78, 278 Double-

sided tape

150, 250 Opening 255 Insertion opening 279

End part

338, 438, 538 Shield wall part 350 Restriction part 358 Ventilation hole 360

Ventilation opening

436A, 536A

Shield end center

436B, 536B Shield end side 460

Locking piece

470, 570

Gasket

476, 576 Locking opening 560 Restriction piece

Claims

A fixing portion provided on a metal plate having a shielding function and fixed to a fixed member;
A cloth-like or sheet-like or gasket-like conductive member disposed between the fixing portion and the fixed member;
The conductive member has an opening for locking,
The said fixing member has the latching | locking part latched with the opening for latching of the said electroconductive member. The shield fixing structure characterized by the above-mentioned.
On the back side of the fixed part, a concave shape is formed,
2. The shield fixing structure according to claim 1, wherein when the conductive member is disposed, the space surrounded by the concave shape and the conductive member communicates the inside and outside of the shield plate.
The shield fixing structure according to claim 1 or 2, wherein the fixing portion has a plurality of openings formed in a region where the conductive member is disposed.
A thin display device having the shield fixing structure according to any one of claims 1 to 3.
The thin display device according to claim 4, wherein the size of the display panel is 80 inches or more.