WO2010038809A1

WO2010038809A1 - Display device

Info

Publication number: WO2010038809A1
Application number: PCT/JP2009/067096
Authority: WO
Inventors: 祐介大谷; 豊江場; 拓司山谷
Original assignee: シャープ株式会社; 神志那典彦
Priority date: 2008-09-30
Filing date: 2009-09-30
Publication date: 2010-04-08
Also published as: JP2010061088A; JP4538519B2

Abstract

Provided is a display device which is thin and has improved mechanical strength. The display device has a first fastening section (20) which fastens together a rear side casing (1) of the display device and a chassis (4) on an outer circumferential section, and a second fastening section (19) which fastens together the rear side casing (1) and the chassis (4) inside. The rear side casing and the chassis are fastened inside at a plurality of areas, and in an internal fastened section, the rear side casing (1) and the chassis (4) are brought into contact with each other directly or by having an internal component therebetween, and form a box-like cross-section.

Description

Display device

The present invention prevents a decrease in strength due to thinning of a display device such as a liquid crystal television equipped with a liquid crystal display (Liquid Crystal Display; abbreviated LCD) and a plasma television equipped with a plasma display (Plasma Display Panel; abbreviated PDP). The present invention relates to a display device that can be preferably implemented.

In recent years, display devices equipped with liquid crystal display devices (Liquid Crystal Display; abbreviated LCD) or plasma display devices (abbreviated as PDP) are becoming thinner and larger screens. High reliability with respect to mechanical strength is required so as not to cause damage or deformation to the force.

FIG. 1 is a simplified exploded perspective view of a conventional liquid crystal television. A liquid crystal television will be described as an example of a conventional display device. The liquid crystal television is composed of an LCD unit 2, a front casing 3, and a rear casing 1. The LCD unit 2 includes an optical unit 5 and a chassis 4. The optical unit 5 includes an LCD panel, a light guide plate, and an optical component composed of a plurality of light emitting elements such as light emitting diodes (abbreviated as LEDs). The chassis 4 is made of a punched material of a metal plate such as an aluminum alloy plate or a stainless steel plate having high mechanical rigidity. A substrate 6 is fastened to the chassis 4, the LCD unit 2 is fastened to the front case 3, and the front case 3 and the back case 1 are fastened.

Since such a liquid crystal television is reduced in thickness, its mechanical strength, in particular bending rigidity, is lowered, and thus a large deflection occurs when an external force is applied.

FIG. 2A is a cross-sectional view modeling the upper part of a conventional liquid crystal television, and FIG. 2B is a cross-sectional view of the upper part modeled when the liquid crystal television shown in FIG. 2A is thinned. FIG. 3 is an exploded perspective view schematically showing a state in which the upper portion of the liquid crystal television of FIGS. 2A and 2B is separated. In the conventional liquid crystal television, the rear casing 1, the fastening angle member 10, and the front casing 3 are fixed by fastening parts 20 at the outer peripheral portion. The chassis 4 is fixed to the fastening angle member 10 by fastening parts 20.

The deformation amount of the model is calculated by performing the stress analysis when the concentrated load P is applied to the calculation condition shown in FIG. 4, that is, the center of the simple beam structure of the both ends fixed bearing, and the result is shown in FIG. In FIG. 5, the horizontal axis represents the load, and the vertical axis represents the deformation amount. Comparing the results of calculating the deformation with respect to the load, it can be seen that sufficient strength cannot be obtained with the conventional structure due to the reduction in thickness.

Moreover, in the prior art of patent document 1, a chassis and a back housing | casing are fastened with the four corners of an outer periphery outer edge part, and one or more fixed boss | hubs other than four corners so that drop impact resistance can be made high. It is configured.

Japanese Patent Laid-Open No. 11-119678

In such a conventional technique, as the product is made thinner, the mechanical strength is lowered by reducing the thickness of the product, and sufficient rigidity against bending load cannot be obtained only by fastening with a fixed boss. Moreover, in the structure which added the reinforcement frame, since a fixed boss | hub and a reinforcement frame overlap in the thickness direction, there exists a problem that it becomes difficult to reduce in thickness.

An object of the present invention is to provide a display device that is thin and has high mechanical strength.

The present invention is a display device comprising a display member unit, a chassis, and a housing fastened to the chassis,
A first fastening portion for fastening an outer edge portion of the chassis to the housing;
A plurality of second fastening portions for fastening an inner region inside the outer edge portion of the chassis to a housing;
The display device is characterized in that the housing and the chassis are in contact with each other without a gap between at least two second fastening portions of the plurality of second fastening portions.

According to the present invention, the display device includes a display member unit, a chassis fastened to the display member unit, and a housing fastened to the chassis. The outer edge portion of the chassis is fastened to the housing by the first fastening portion, and the inner region inside the outer edge portion of the chassis is fastened to the housing by the plurality of second fastening portions. Between the plurality of second fastening portions, the housing and the chassis are in contact with no gap.

The inner region inside the outer edge portion of the chassis is fastened to the housing by a plurality of second fastening portions, and the housing and the chassis are in contact with each other without any gap between at least two second fastening portions. Even if the device is thinned, high mechanical strength, particularly bending rigidity can be achieved.

The present invention is a display device comprising a display member unit, a chassis, and a housing fastened to the chassis,
A first fastening portion for fastening an outer edge portion of the chassis to the housing;
A plurality of second fastening portions for fastening an inner region inside the outer edge portion of the chassis to the housing;
The display device is characterized in that a first reinforcing member is interposed between at least two second fastening portions among the plurality of second fastening portions.

According to the present invention, the display device includes a display member unit, a chassis, and a housing, and the outer edge portion of the chassis is fastened to the housing by the first fastening portion, and the inner region is inward of the outer edge portion of the chassis. Are fastened to the housing by a plurality of second fastening portions. Furthermore, a first reinforcing member is interposed between at least two second fastening portions among the plurality of second fastening portions.

With such a configuration, even if the display device is thinned, high mechanical strength, particularly bending rigidity can be achieved. In addition, the inner region inside the chassis and the housing are fastened by a plurality of second fastening portions, and the first reinforcing member is interposed between at least two second fastening portions. Therefore, even higher bending rigidity can be achieved.

According to the present invention, the region inside the outer edge portion of the chassis is fastened to the housing by the plurality of second fastening portions, and the chassis and the housing are in contact with each other without any gap between at least two second fastening portions. The chassis, the casing, and a first fastening portion that fastens the outer edge of the chassis to the housing, and a plurality of second fastening portions that fasten the inner region of the chassis to the housing, for example, closing a box-shaped cross section or the like A cross-sectional structure of the system can be realized, whereby high mechanical strength can be ensured even with a thin structure.

According to the present invention, since the first reinforcing member is interposed between at least two of the plurality of second fastening portions, it is possible to achieve even higher bending rigidity.

Objects, features, and advantages of the present invention will become more apparent from the following detailed description and drawings.
It is the disassembled perspective view which simplified the liquid crystal television of the prior art. It is sectional drawing which modeled the upper part of the liquid crystal television of a prior art. It is sectional drawing of the upper part modeled when the liquid crystal television shown to FIG. 2A is reduced in thickness. It is a disassembled perspective view which shows typically the state which isolate | separated the upper part of the liquid crystal television of FIG. 2A and FIG. 2B. It is a figure which shows the calculation model for verifying the improvement of bending rigidity. It is a graph which shows the relationship of the displacement with respect to load. It is a partial sectional view showing a fastening structure of a display device of one embodiment of the present invention. It is a partial exploded perspective view which shows the fastening structure of a back housing | casing and a chassis. It is a partial exploded perspective view which shows the state which interposed the 1st reinforcement member between the back housing | casing and the chassis. It is a graph which shows the calculation result of the bending rigidity of the display apparatus shown in FIG.7 and FIG.8, and shows the relationship of the displacement with respect to a load. It is a partial cross section figure which shows the fastening structure of the display apparatus of other embodiment of this invention. It is a partial exploded perspective view which shows the fastening structure of a back housing | casing and a chassis. It is a graph which shows the calculation result of the bending rigidity of the display apparatus shown in FIG. 10, and shows the relationship of the displacement with respect to a load. FIG. 10 is a partial cross-sectional view illustrating a fastening structure of a display device according to still another embodiment of the present invention. It is sectional drawing which shows the specific structure in the one fastening part of the display apparatus of FIG. It is sectional drawing which shows the specific structure between some fastening parts of the display apparatus of FIG. It is sectional drawing which shows the fastening structure of the display apparatus of further another embodiment of this invention. It is sectional drawing which shows the fastening structure of the display apparatus of further another embodiment of this invention. It is a partial cross section figure which shows the fastening structure of the display apparatus of further another embodiment of this invention. It is sectional drawing which shows the conventional structural model. FIG. 20 is a simplified exploded perspective view of a conventional display device including the fastening structure shown in FIG. 19. It is a graph which shows a calculation result.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 6 is a partial cross-sectional view showing a fastening structure of a display device according to an embodiment of the present invention. The basic configuration of the display device shown in FIG. 6 is similar to that of the prior art display device shown in FIG. 1, and thus the corresponding parts are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. Referring also to FIG. 1, the liquid crystal television as a display device of this embodiment includes a liquid crystal display (LCD) unit 2, a front casing 3, and a rear casing 1. The LCD unit 2 is realized by an optical unit 5 which is a display member unit. The optical unit 5 includes an LCD panel, a light guide plate, and an optical component including a plurality of light emitting elements such as light emitting diodes (abbreviated as LEDs).

The chassis 4 is made of a punched material such as an aluminum alloy plate or a stainless steel plate. The substrate 6 is fastened to the chassis 4, the LCD unit 2 is fastened to the front case 3, and the front case 3 and the back case 1 are fastened. The back housing 1 and the chassis 4 are in contact with each other via the first reinforcing member 11, and the back housing 1, the first reinforcing member 11, and the outer edge portion of the chassis 4 are connected by the plurality of first fastening portions 20. It is concluded. These first fastening portions 20 are realized by bolts and nuts.

The fastening angle member 10 is fastened to the chassis 4 by the first fastening portion 20, and the rear housing 1 and the front housing 3 are fastened by the first fastening portion 20 via the fastening angle member 10.

Further, the inner region of the chassis 4 that is inward of the outer edge portion is fastened to the rear housing 1 together with the first reinforcing member 11 by a plurality of second fastening portions 19. The second fastening portion 19 is realized by a bolt. The first reinforcing member 11 may be realized by a separate part made of a single long material having a rectangular cross section made of metal or hard synthetic resin, and other members such as the back housing 1 and the chassis 4. It may be realized by a part of.

The chassis 4 has a flat base portion 4b integrally connected in the in-plane direction of the concave outer peripheral portion 4a whose section faces the rear housing 1 and is open, and the outer peripheral portion 4a has high bending rigidity. Such a chassis 4 is fixed to a raised portion 1 a formed on the outer peripheral portion of the rear housing 1 by a fastening angle member 10. The fastening angle member 10 may be realized by a plurality of short metal members having a substantially S-shaped cross section.

FIG. 7 is a partial exploded perspective view showing a fastening structure between the rear housing 1 and the chassis 4, and FIG. 8 is a state in which the first reinforcing member 11 is interposed between the rear housing 1 and the chassis 4. FIG. 7 and FIG. 8 are model diagrams of the upper part of the display device shown in FIG. In the internal fastening section L1, the rear housing 1 and the chassis 4 are fastened via the first reinforcing member 11, and a box-shaped cross-sectional structure S3 including an internal fastening portion S1 and an outer edge portion S2 (see FIG. 6). Is realized.

A conventional structure (corresponding to FIG. 7) in which the rear housing 1 and the chassis 4 are fastened by a fixed boss 30 disposed on the chassis 4, and the rear housing 1 and the chassis 4 are connected via the first reinforcing member 11. FIG. 4 shows the structure of the present invention (corresponding to FIG. 8) in which the inner fastening section L1 is in contact with the rear housing 1 and the chassis 4 via the first reinforcing member 11 as shown in FIG. The calculation model in which the concentrated load P acts on the center of a simple beam of a both-end fixed bearing having a length L = 1000 mm, a width B = 100 mm, and a thickness T = 6.5 mm was calculated by simulation using a finite element method. The calculation result is shown in FIG. In FIG. 9, the horizontal axis represents the load, and the vertical axis represents the displacement. Comparing the calculation results of the deformation amounts, it can be seen that the box-shaped cross-sectional structure S3 according to the present invention has a small amount of displacement and high strength.

As described above, a region inward of the outer edge portion of the chassis 4 is fastened to the rear housing 1 by the plurality of second fastening portions 19, and the first reinforcing member 11 is interposed between the second fastening portions 19. Since the chassis 4 and the rear housing 1 are brought into contact with each other without any gaps and the outer edges of the rear housing 1, the front housing 3, and the chassis 4 are fastened by the first fastening portion 20, for example, a box-shaped cross section is closed. It is possible to realize a cross-sectional structure of the system, thereby fastening the internal fastening section L1, improving the mechanical strength against the bending load P of the display device, that is, improving the bending rigidity, and reducing the thickness. In addition, a display device with high mechanical strength can be realized.

FIG. 10 is a partial cross-sectional view showing a fastening structure of a display device according to another embodiment of the present invention, and FIG. 11 is a partial exploded perspective view showing a fastening structure between the rear housing 1 and the chassis 4. . In the present embodiment, regarding the structure in which the rear housing 1 and the chassis 4 are brought into contact with each other, the throttle portion 21 is provided in the chassis 4 instead of the first reinforcing member 11 so that the rear housing 1 and the chassis 4 are brought into contact with each other. Also good. By adopting such a configuration, it is possible to improve the bending rigidity as in the above-described embodiment, and FIG. 10 shows a cross section of the model used for the calculation, and FIG. 11 shows an exploded perspective view thereof. Furthermore, the calculation result which calculated | required the displacement with respect to a load is shown in FIG. In FIG. 12, the horizontal axis represents the load, and the vertical axis represents the displacement.

FIG. 13 is a partial cross-sectional view illustrating a fastening structure of a display device according to still another embodiment of the present invention, and FIG. 14 illustrates a specific structure of a fastening portion of a part of the display device of FIG. FIG. 15 is a cross-sectional view, and FIG. 15 is a cross-sectional view showing a specific structure between some fastening portions of the display device of FIG. The parts corresponding to those of the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted to avoid duplication.

The display device of the present embodiment is a liquid crystal television, and in addition to the configuration of the above-described embodiment, a substrate cover 7 that is a second reinforcing member is provided. The substrate cover 7 is made of a conductive metal or a conductively plated molded product, and is realized by a plate-like body that covers the substrate 6.

The display device includes circuit boards for various applications. That is, the circuit board includes a drive circuit board and a power supply circuit board that supply a drive signal to the display panel. However, such various circuit boards have a problem of generating electromagnetic waves and inducing electromagnetic interference (abbreviated as EMI). As described above, the electromagnetic interference generated by the circuit board deteriorates the quality of the display device and causes other defects.

Therefore, components that generate electromagnetic waves, such as a circuit board including a drive circuit board, an inverter circuit board, and a control circuit board, affect EMI by being individually covered with an electromagnetic shielding member such as a conductive board cover, for example. Frequency electromagnetic waves can be suppressed.

A substrate cover 7 is used to shield electromagnetic waves generated from the circuit board fixed to the chassis 4. The substrate cover 7 is made of a conductor and is formed in a rectangular parallelepiped shape. The board cover 7 is separately fastened to the chassis 4 by

fastening members

32 and 33. Further, the reinforcing frame 8 is not associated with the substrate cover 7 and is independently fastened to the chassis 4.

In addition, regarding the EMI countermeasure component, the configuration for individually shielding the drive circuit and the power supply circuit has a complicated configuration for shielding, and the number of components for the shielding component increases, and the number of manufacturing steps for attaching the shielding component also increases. This increases the manufacturing cost of the display device.

The board cover 7 is fastened to the chassis 4 together with the first reinforcing member 11 and the second reinforcing member 30 by the first fastening portion 20 and the second fastening portion 19 in a so-called co-tightened state, and has a box-shaped cross section. Structures S3 and S4 are configured. Therefore, compared with the substrate cover 7 of the conventional display device shown in the cross-sectional view of FIG. 19 and the exploded perspective view of FIG. 20, the number of fastening parts such as screws for fastening can be reduced. Further, since the substrate cover 7 of the present embodiment is fastened together with the reinforcing

members

11 and 30 to the chassis 4, it can be realized by a flat plate-like body, thereby simplifying processing such as bending. Manufacturing cost can be reduced.

By adopting such a configuration, the manufacturing cost can be reduced, and the bending rigidity can be improved as in the above-described embodiment. FIG. 21 shows the result of displacement calculation at the time of loading for the structural model of the present embodiment shown in FIG. 13 and the conventional structural model of FIG. In the figure, the horizontal axis indicates the load, the vertical axis indicates the displacement, and it can be seen that this embodiment has higher bending rigidity than the conventional one.

FIG. 16 is a cross-sectional view showing a fastening structure of a display device according to still another embodiment of the present invention. The parts corresponding to those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. In the present embodiment, in order to fasten the back housing 1 and the chassis 4 in contact with each other, the chassis 4 has one side of the substrate 6 instead of the first and second reinforcing

members

11 and 30 described above. The first reinforcing member 11 is disposed on the other side of the substrate 6, and the rear housing 1 and the chassis 4 are directly brought into contact with each other through the one throttle portion 21. Is done. Also by adopting such a configuration, the bending rigidity can be remarkably improved as compared with the conventional display device as in the above-described embodiments.

FIG. 17 is a cross-sectional view showing a fastening structure of a display device according to still another embodiment of the present invention. Note that portions corresponding to those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. In the present embodiment, the narrowed portions 21 are formed on the chassis 4 on both sides of the substrate 6, and the rear housing 1 and the chassis 4 are fastened in direct contact with each other through the narrowed portions 21. Also by adopting such a configuration, the bending rigidity can be remarkably improved as compared with the conventional display device as in the above-described embodiments.

FIG. 18 is a partial cross-sectional view showing a fastening structure of a display device according to still another embodiment of the present invention. Note that portions corresponding to those of the above-described embodiments are denoted by the same reference numerals, and description thereof is omitted to avoid duplication. In the present embodiment, the first reinforcing member 11 is arranged on one side of the substrate 6 in the chassis 4, the throttle part 21 is formed on the other side of the substrate 6, and the rear housing 1 and the chassis 4 are connected to the other side. Fastened in a state of direct contact through the other restrictor 21. Also by adopting such a configuration, the bending rigidity can be remarkably improved as compared with the conventional display device as in the above-described embodiments.

In yet another embodiment of the present invention, a hole necessary for achieving a product function, such as a hole for passing a cable or the like between the housing and the chassis, a slit may be vacant. . Further, in a state where no load is applied, a clearance of 3 mm or less or a diagonal length of the display screen of 0.2% or less may be provided between the housing and the chassis. This is because when the casing is twisted or bent, the clearance is closed, and as a result, the casing is in contact with no gap. The diagonal length of 0.2% of the display screen corresponds to 2.6 mm and 65 type 3.25 mm in a 52 type display device.

Further, the first reinforcing member may be a separate part from the chassis and the housing, and the first reinforcing member may be attached to at least two or more second parts of the chassis or the housing. It may be processed into a shape such as a groove, a punch, a rib or the like between the two fastening portions. The third reinforcing member may be a separate component from the chassis and the second reinforcing member, and the first reinforcing member may include a part of the chassis or a part of the second reinforcing member. It may be processed into a shape such as a groove, a punch, a rib or the like between at least two or more third fastening portions.

In each of the above-described embodiments, the liquid crystal television has been described as the display device. However, the present invention is not limited to this, and the present invention is not limited to this. It can implement suitably.

In still another embodiment of the present invention, a hollow and long reinforcing member may be used instead of the solid and long reinforcing

members

11 and 30, or the cross-sectional shape may be “U”. “”, “I”, “π”, “Ω”, and “T”. By employing the reinforcing member having such a cross-sectional shape, the weight can be reduced.

Furthermore, in another embodiment of the present invention, a first reinforcing member such as a wiring board may be interposed between the plurality of second fastening portions 19, and this is also the same as in the above-described embodiments. The effect can be achieved.

The present invention can be implemented in various other forms without departing from the spirit or main features thereof. Therefore, the above-described embodiment is merely an example in all respects, and the scope of the present invention is shown in the claims, and is not restricted by the text of the specification. Further, all modifications and changes belonging to the scope of the claims are within the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Rear housing | casing 2 LCD unit 3 Front housing | casing 4 Chassis 5 Optical unit 6 Board | substrate 7 Board | substrate cover 8 Frame 10

Fastening angle member

11,30

Reinforcement member

19,20,31,32,33 Fastening part L1 Internal fastening area S2 Outer edge part S3 Box-shaped cross section structure 1
S4 Box-shaped cross section structure 2

Claims

A display device comprising a display member unit, a chassis, and a housing fastened to the chassis,
A first fastening portion for fastening an outer edge portion of the chassis to the housing;
A plurality of second fastening portions for fastening an inner region inside the outer edge portion of the chassis to the housing;
The display device is characterized in that the housing and the chassis are in contact with each other without a gap between at least two second fastening portions of the plurality of second fastening portions.
A display device comprising a display member unit, a chassis, and a housing fastened to the chassis,
A first fastening portion for fastening an outer edge portion of the chassis to the housing;
A plurality of second fastening portions for fastening an inner region inside the outer edge portion of the chassis to the housing;
A display device, wherein a first reinforcing member is interposed between at least two second fastening portions of the plurality of second fastening portions.
A cross-sectional structure is configured by the chassis, the housing, a first fastening portion that fastens the outer edge of the chassis to the housing, and a plurality of second fastening portions that fasten the inner region of the chassis to the housing,
A second reinforcing member fastened by a second fastening portion and a plurality of third fastening portions for fastening the second reinforcing member and the chassis to a further inner region of the cross-sectional structure;
The display device according to claim 1, wherein the second reinforcing member and the chassis are in contact with each other without a gap between at least two third fastening portions of the plurality of third fastening portions.
A cross-sectional structure is configured by the chassis, the housing, a first fastening portion that fastens the outer edge of the chassis to the housing, and a plurality of second fastening portions that fasten the inner region of the chassis to the housing,
A second reinforcing member fastened by a second fastening portion and a plurality of third fastening portions for fastening the second reinforcing member and the chassis to a further inner region of the cross-sectional structure;
The display device according to claim 1, wherein a third reinforcing member is interposed between at least two third fastening portions of the plurality of third fastening portions.
A cross-sectional structure is configured by the chassis, the housing, a first fastening portion that fastens the outer edge of the chassis to the housing, and a plurality of second fastening portions that fasten the inner region of the chassis to the housing,
A second reinforcing member fastened by a second fastening portion and a plurality of third fastening portions for fastening the second reinforcing member and the chassis to a further inner region of the cross-sectional structure;
The display device according to claim 2, wherein the second reinforcing member and the chassis are in contact with each other without a gap between at least two third fastening portions of the plurality of third fastening portions.
A cross-sectional structure is configured by the chassis, the housing, a first fastening portion that fastens the outer edge of the chassis to the housing, and a plurality of second fastening portions that fasten the inner region of the chassis to the housing,
A second reinforcing member fastened by a second fastening portion and a plurality of third fastening portions for fastening the second reinforcing member and the chassis to a further inner region of the cross-sectional structure;
The display device according to claim 2, wherein a third reinforcing member is interposed between at least two third fastening portions among the plurality of third fastening portions.