JP2010256619A - Heat dissipating structure of thin image display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thin image display for efficiently dissipating heat, even when it is densely contacted to a wall face in wall hanging installation, by a structure in which heat generated in the image display is dissipated by heat transfer to outside of a housing by heat conduction without using a fun or an air duct for exterior, and by making a heat dissipating structure outside the housing so that thickness of the image display may not increase. <P>SOLUTION: A heat diffusion sheet which densely contacts a whole chassis for supporting the image display panel at a back face side is provided. An extended section of the heat diffusion sheet is provided outside of an outline of the chassis, and a plurality of convex and concave sections of the heat dissipating section densely contacting the back side of the extended section, are exposed outside of the housing. Moreover, arrangement of external input terminals is related to arrangement of the concave sections of the heat dissipating section, and an external cable is placed along a guide of the convex sections of the heat dissipating section. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an image display apparatus that outputs video signals and audio signals including television broadcasting.

  Thin applications such as display devices using electron-emitting devices, display devices using plasma discharge, display devices using liquid crystals, display devices using fluorescent display tubes for applications such as televisions, computer terminals, advertising media, signs, etc. An image display device is used.

  The basic structure of these devices consists of an image display part, an electric circuit part, a structure part that supports them, and an exterior part. Recently, a wall-mounted television with a screen size of 40 type or more is attracting attention. In addition, products that have been made thinner and have improved merchantability have begun to spread in the market.

  By the way, since a large thin image display device consumes a large amount of power in terms of function, a heat radiation design is important. However, if the structure is made thinner, the heat radiation performance becomes insufficient simply by providing air intake / exhaust holes in the exterior as in the prior art.

  For example, as one conventional example, the structure of Patent Document 1 (Japanese Patent Laid-Open No. 2000-227767 flat panel display) is shown in FIG. Reference numeral 51 denotes a display body for displaying an image. Two glass substrates are opposed to each other, and an electric circuit and a light emitting layer are formed on the facing surfaces. Reference numeral 52 denotes a support that supports the display body 51 from the back side by an adhesive means (not shown), which is made of a rigid metal material into a desired shape. Reference numeral 53 denotes an electrical board for driving the display body 51, which supplies power and outputs signals. Reference numeral 54 denotes a bezel for protecting the display body 51 and the electric board 53, and an opening for displaying an image is provided on the front side. Similarly to the bezel 54, 55 is a back cover for protecting the internal parts, which is formed by pressing a metal material or injection molding a resin material. Reference numeral 56 denotes a pipe frame that is fastened to the support body 52 and passes through the through-hole of the back cover 55 and extends in the back direction, and a structure obtained by bending the pipe is symmetrically arranged on the left and right. Reference numeral 57 denotes an attachment portion for firmly fastening the pipe frame 56 to the support body 52, and includes a portion (not shown) surrounding the pipe frame 56 and a portion (not shown) screwed to the support body 52. Reference numeral 58 denotes a heat radiating portion for contacting the pipe frame 56 and releasing heat into the air, and has a concavo-convex shape for increasing the surface area.

  A feature of the above configuration is that the pipe frame 56 dissipates heat generated by the electrical board 53 to the outside of the back cover 55, and a portion exposed to the outside can be used for fixing to a wall-mounted installation bracket.

  As another conventional example, the structure of Patent Document 2 (Japanese Patent Laid-Open No. 2001-023530 plasma display device) is shown in FIG. Reference numeral 61 denotes an image panel that displays an image using plasma discharge, and is configured by arranging two glass substrates facing each other. A heat transfer sheet 62 is in close contact with the back surface of the image panel 61 and has a structure in which graphite as a raw material is thinly laminated and has excellent heat conductivity in a direction along the surface. A heat transfer sheet 63 is in close contact with the periphery of the front surface of the image panel 61 and is the same material as the heat transfer sheet 62. Reference numeral 64 denotes a base portion that supports the image panel 61 on the back side, and 65 denotes a circuit portion that supplies signals and electric power to drive the image panel 61. Reference numeral 66 denotes a front plate that protects the image panel 61, and is made of glass that has been subjected to a process for making the image easy to see and preventing leakage of electromagnetic waves. Reference numeral 67 denotes a front frame that forms part of the exterior, and 68 denotes a housing that protects the circuit unit 65 and forms part of the exterior.

  The feature of the above configuration is that the heat generated in the image panel 61 is diffused in the surface direction by the heat transfer sheet 62 and the heat transfer sheet 63, the temperature difference in the image panel 61 is reduced, and the image panel 61 is damaged. It is to prevent.

JP 2000-227767 Japanese Patent Laid-Open No. 2001-023530

  However, the conventional techniques described above have the following problems.

  In the technique of Patent Document 1, in order to efficiently transfer the heat of the electrical board 53 to the pipe frame 56, the contact area between the two is small, a large amount of heat cannot be expected, and the heat of the display 51 can be radiated. It is equally difficult. Furthermore, since the heat radiating portion 58 protrudes behind the back cover, there is a problem that the appearance is inferior because it cannot be brought into close contact with the wall surface when installed on the wall.

  In the technique of Patent Document 2, only the temperature difference in the surface of the image panel 61 is reduced, and another means such as an intake / exhaust hole or a fan for radiating heat to the outside of the housing is required. However, when installing air intake / exhaust holes, it is necessary to have a space for air to enter and exit on the back side when installing on the wall, so that it cannot adhere to the wall surface and the appearance is inferior. In particular, this affects the life of elements such as capacitors. Further, when a fan is employed, there is a problem that the thickness of the image display device is increased by securing an air flow path that passes through the fan.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable thin image display device that can efficiently dissipate heat even if it is in close contact with a wall surface without being affected by the thickness of the image display device.

In order to solve the above-described problems, in the first embodiment of the present invention,
A heat diffusion sheet that adheres substantially over the entire surface of the chassis that supports the image display panel on the back side is provided, and the heating element that generates a large amount of heat is in close contact with the heat diffusion sheet to transfer heat.

  The heat diffusion sheet was provided with an extension portion outside the outer shape of the chassis, and a plurality of convex portions and concave portions of the heat radiating portion in close contact with the back side of the extension portion were exposed to the outside of the casing.

  The front side of the extension part has a structure in which a heat insulating material is sandwiched between the speaker enclosure. The heat dissipating part sandwiched the heat insulating material and the extension part, and was fixed to the rear part of the enclosure and the bezel.

  In addition, the arrangement of the external terminals and the arrangement of the concave portions of the heat radiating portion are made to correspond to each other so that the concave portions are vertically connected in the direction directly below the position of each external terminal.

Furthermore, in order to solve the above-mentioned problem, in the second embodiment of the present invention,
A heat diffusion sheet that adheres almost the entire surface is provided on the back side of the image display panel, and a chassis is provided on the back side of the heat diffusion sheet to form a laminated structure. An extension part of the heat diffusion sheet was provided outside the outer shape of the chassis, and a plurality of protrusions and recesses of the heat radiating part in close contact with the back side of the extension part were exposed to the outside of the casing.

  The front side of the extension part has a structure in which a heat insulating material is sandwiched between the speaker enclosure. The heat dissipating part was sandwiched between the heat insulating material and the extension part, and fixed to the back part of the enclosure and bezel.

  Further, the arrangement of the external terminals corresponds to the arrangement of the recesses of the heat radiating portion, and the recesses are provided so as to be vertically connected in the direction directly below the positions of the external terminals.

According to the present invention,
1. When the image display device is in close contact with the wall surface, it is possible to release heat generated in the image display panel and circuit boards to the outside of the case without providing the air intake / exhaust holes and air cooling fan that were necessary in the past. The durability of the element on the electric circuit is also improved without increasing the body thickness.

  2. Furthermore, the unevenness of the heat dissipation part can be used as a guide for the external connection cable, and the appearance and reliability such as the image display device floating from the wall surface due to messy cable processing when it is closely attached to the wall, or the cable is disconnected The effect is that the problem can be solved.

1 is a longitudinal sectional view of an image display device that best represents the characteristics of a first embodiment of the present invention. It is a back side appearance figure of a 1st embodiment. It is a bottom side external view of a 1st embodiment. It is a longitudinal cross-sectional view of the image display apparatus which best represents the characteristics of the second embodiment of the present invention. It is a longitudinal section which shows the structure of patent document 1 (Unexamined-Japanese-Patent No. 2000-227767 flat panel display) of a prior art example. These are the longitudinal sections which show the structure of patent document 2 (Unexamined-Japanese-Patent No. 2001-023530 plasma display apparatus) of a prior art example.

Example 1
FIG. 1 is a longitudinal sectional view of an image display device that best represents the features of the first embodiment of the present invention.

  2 is a rear side external view of the first embodiment, and FIG. 3 is a bottom side external view of the first embodiment. The same parts are marked with the same numbers to explain the structure.

  The image display device of the present invention includes an image display panel 1 whose inside is maintained in a vacuum as an image display panel (display panel) for displaying an image. The image display panel 1 includes a face plate having a high voltage region of an RGB phosphor film and a metal conductive film on a glass substrate, and a rear plate having an X-direction wiring, a Y-direction wiring, and an electron-emitting device formed on the glass substrate. And a frame member (not shown).

  The back surface of the image display panel 1 is supported on the chassis 2 via an adhesive layer (not shown). The chassis 2 was formed by pressing a thin plate of aluminum alloy with a thickness of about 2 mm into a desired shape.

  On the other hand, a front plate 3 is provided on the front side of the image display panel 1 to protect the image display panel 1 from the entry of dust from the outside and the collision of foreign matter. The front plate 3 was subjected to a process for improving the image contrast in order to make the displayed image easy to see. Similarly, a bezel 4 having internal protection and appearance is disposed in the front peripheral portion of the image display panel 1. The front surface of the bezel 4 has a rectangular opening, and a fitting structure with the front plate 3 is provided.

  The rear cover 5 is in close contact with the peripheral portion on the back side of the bezel 4 and is fastened by a plurality of screws (not shown), and a drawing shape and screw through holes (not shown) are formed by pressing a 0.5 mm thick steel plate. In combination with the bezel 4, the internal image display panel 1 and electric boards described later are covered to cope with the entry of dust and foreign matter and the shielding of harmful electromagnetic waves generated from electric circuits. .

  A plurality of speakers 6 are arranged symmetrically when viewed from the front in the lower part on the front side of the bezel 4 and have a function of sounding sound matched to an image with a sense of presence. In order to efficiently emit the sound quality of the speaker 6, particularly the bass, the enclosure 6 is provided and the speaker 6 has a substantially sealed structure.

  On the rear surface of the chassis 2, a heat diffusion sheet 8 adhered to almost the entire surface was provided. The thermal diffusion sheet 8 is a sheet in which a laminate of graphite (graphite) as a base material is covered with an insulating soft resin, and is configured to be firmly fixed to the chassis 2 with a double-sided tape or an adhesive material.

  The lower part of the heat diffusion sheet 8 was separated from the chassis 2 and extended to the back surface of the enclosure 7, and the heat radiating portion 9 was brought into close contact with the back surface of the extension 8-a. The heat radiating part 9 is fixed to the enclosure 7 and the back surface of the bezel 4 with screws (not shown), and a plurality of convex parts 9-a and a plurality of concave parts 9-b are formed by extruding and cutting an aluminum alloy. Formed.

  Moreover, the heat insulating material 10 was arrange | positioned in the front side of the extension part 8-a of a thermal diffusion sheet. The heat insulating material 10 has a positioning shape (not shown) that is formed by processing a foamed resin sheet into a desired shape and is held between the enclosure 7 and the extension 8-a.

  A plurality of bosses are arranged on the rear side of the chassis 2, and the power supply board 11 and the signal input board 13 are fixed by screws (not shown). The power supply board 11 has a function of supplying electricity to the entire electric circuit of the image display apparatus, and is one of the components that consumes a large amount of power and generates a large amount of heat.

  The signal input board 13 has a function of receiving the image signal and the audio signal displayed by the image display apparatus from the outside with a cable, and is provided with round or square connection terminals compliant with various standards. ing.

  The drive board 15 disposed in the periphery of the chassis 2 is an electric circuit that is electrically connected to the image display panel 1 by an FPC (flexible thin wiring) 16 and outputs an image selection signal. Reference numeral 17 denotes an electric board including a power supply board 11, a signal input board 13, and a driving board 15 and including other electric boards (not shown) inside the image display apparatus.

  In addition, heating elements 12 and 18 with large power consumption were mounted on the front side of the power supply board 11 and the electric boards 17. At a position facing the heating element 12, a part of the heat diffusion sheet 8 was cut and formed by press working so that a bent part 8-b formed so as to be in close contact with the surface of the heating element. Further, the surface of the heating element 18 was brought into close contact with the surface of the thermal diffusion sheet 8.

  In the above configuration, assuming that the image display apparatus is installed in close contact with the wall surface, the heat dissipation structure that is a feature of the present invention will be described in detail. This image display apparatus has several heat generating elements. One of the heat generating elements is the image display panel 1. Electrons emitted from the rear-side rear plate are accelerated by a high voltage and collide with the metal conductive film on the face plate, causing the RGB phosphor film to emit light and display an image. The power consumption exceeds about 150 W at 55 inches diagonal. Part of the generated heat passes through the front plate 3 through the air layer in the front direction and then diffuses to the surrounding outside air, and the remaining heat is transmitted to the chassis 2 through the adhesive layer in the back direction, Further, it is transmitted to the thermal diffusion sheet 8 that is in close contact with the entire surface of the chassis 2.

  Another of the heat generating elements is the electric boards 17 and the power consumption exceeds about 200 W as a whole under the most current-carrying conditions. The heat generated in the electric boards 17 is partly diffused to the wall surface through the rear cover 5 due to the convection of the surrounding air, but since the wall surface of many residences has high heat insulating properties such as plaster and wood, Much of the remaining heat is transferred to the thermal diffusion sheet 8.

  Further, as the heat generating elements, the heat generating elements 12 and 18 having high power consumption are configured to be in close contact with the heat diffusion sheet 8 so that heat can be transferred more efficiently than air convection. Although not shown, an elastic or viscous heat conductive material may be interposed between the heat generating elements 12 and 18 and the heat diffusion sheet 8.

  It has been described that the heat from each heating element is transferred to the thermal diffusion sheet 8 by the above structure.

  The thermal diffusion sheet 8 has thermal conductivity of about several W / mk in the plane direction due to its characteristics, but has thermal conductivity characteristics of about 300 W / mk or more in the direction along the plane. Utilizing this excellent thermal diffusivity, the heat transfer path described below is effective.

  That is, the heat transferred from the image display panel 1 through the chassis 2, the heat generated by the electric boards 17 and transferred by the convection of the surrounding air, and the heat transferred directly from the heating elements 12 and 18 are heat The inside of the diffusion sheet 8 is rapidly diffused.

  The lower part of the thermal diffusion sheet 8 passes through the rear part of the drive substrate 15 at a point separated from the chassis 2 and reaches the rear part of the enclosure 7 of the speaker 6. In this position, the extension portion 8-a is in close contact with the heat radiating portion 9, and the heat radiating portion 9 has a surface area that is exposed to the outside air by the convex portion 9-a and the concave portion 9-b. Since the temperature difference between the vicinity of the heat radiating portion 9 and each heat generating element is large, most of the heat diffusing inside the heat diffusion sheet 8 flows downward, is transmitted from the extension portion 8-a to the heat radiating portion 9, and is released to the surrounding outside air Is done.

  In addition, the heat transfer from the thermal diffusion sheet 8 is interrupted by interposing the heat insulating material 10 between the extension portion 8-a and the enclosure 7, and the heat transfer to the heat radiating portion 9 is promoted.

  With the heat dissipation structure described above, it was possible to improve the heat dissipation performance without providing external air intake / exhaust holes or increasing the thickness of the housing for inserting a fan.

  Another explanation is given for the ripple effect using the heat dissipation structure. As shown in FIGS. 2 and 3, the arrangement of the convex portions 9-a and the concave portions 9-b of the heat radiating portion 9 is related to the arrangement of the external terminals 14. That is, the cables (not shown) connected to each external terminal 14 are configured to pass through the recess 9-b of the heat radiating portion. In other words, the convex portion 9-a was used as a guide for cables. As a result, when the image display apparatus is installed in close contact with the wall surface, the cables connected to the external terminals 14 overlap each other and the rear cover 5 does not adhere to the wall surface (the image display apparatus floats) or between the cables. No more worrying about disconnection due to abnormal pressure.

  The characteristics of the present invention described above are summarized as follows.

  A heat diffusion sheet 8 is provided that is in close contact with almost the entire surface of the chassis 2 that supports the image display panel 1 on the back side, and the heat generating elements 12 and 18 that generate a large amount of heat are in close contact with the heat diffusion sheet 8 and transfer heat. The structure.

  The thermal diffusion sheet 8 is provided with an extension portion 8-a outside the outer shape of the chassis 2, and includes a plurality of convex portions 9-a and concave portions 9-b of the heat radiating portion 9 in close contact with the back side of the extension portion 8-a. Exposed outside the body.

  The front side of the extension 8-a is structured to sandwich the heat insulating material 10 between the speaker enclosure 7. The heat dissipating part 9 was fixed to the rear part of the enclosure 7 and the bezel 4 with the heat insulating material 10 and the extension part 8-a sandwiched therebetween.

  Further, the arrangement of the external terminals 14 and the arrangement of the concave portions 9-b of the heat radiating portion 9 are made to correspond to each other, and the concave portions 9-b are vertically connected in a direction immediately below the positions of the external terminals 14 respectively.

  As a result, the following effects can be obtained.

  1. The heat generated in the image display panel and circuit boards can be efficiently absorbed and dissipated outside the housing, and the temperature inside the housing is reduced and reliability even when the image display device is in close contact with the wall surface. Improved. Furthermore, a fan for heat dissipation that causes the thickness of the housing to increase is no longer necessary.

  2. The unevenness of the heat dissipation part can be used as a guide for the external connection cable, which solves the appearance and reliability problems such as the image display device floating due to messy cable processing when it is closely attached to the wall, or the cable disconnection did it.

  In the present embodiment, a graphite (graphite) base material was used for the thermal diffusion sheet 8, but a thin plate made of an alloy containing, for example, gold, silver, or copper is used as long as the material has excellent thermal conductivity. The same effect can be obtained even if it is used.

  Further, in the present embodiment, the cut and bent portion 8-b is brought into close contact with the surface of the heat generating element 12 by forming by press working. However, an elastic spacer is interposed between the chassis 2 and the cut and bent portion 8-b to increase the adhesion. You may make it the structure which increases.

(Example 2)
FIG. 4 is a longitudinal sectional view of an image display device that best represents the characteristics of the second embodiment of the present invention.

  The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  In consideration of future market demands, this embodiment has a large image display device in which the screen size of the image display panel exceeds 55 to 80 inches diagonally and the power consumption is 300 W or more. An effective heat dissipating structure in the case where a plurality of electric circuit boards are configured separately to realize a thinner structure will be described.

  The image display panel 21 was supported on the chassis 2 via a thermal diffusion sheet 22 on the back surface. The thermal diffusion sheet 22 is a sheet in which a laminate of base graphite (graphite) is covered with an insulating soft resin, and is attached to the image display panel 21 and the chassis 2 by a double-sided tape or an adhesive (not shown). Both sides were configured to be closely fixed.

  The lower part of the heat diffusion sheet 22 was extended outward from the end of the chassis 2 to reach the back surface of the enclosure 7, and the heat radiating portion 9 was brought into close contact with the back surface of the extension 22-a. The fixing structure of the heat dissipating part 9 and the structure of the peripheral part of the extension part 22-a are the same as those in the first embodiment, and a description thereof will be omitted.

  Reference numeral 23 denotes a drive substrate, which moves the arrangement of the drive substrate 15 of the first embodiment upward, and is electrically connected to the image display panel 1 by the FPC 24. The functions of the drive substrate 23 and the FPC 24 are the same as those in the first embodiment, and a description thereof is omitted.

  In the above configuration, assuming that the image display apparatus is installed in close contact with the wall surface, the heat dissipation structure that is a feature of the present invention will be described in detail. This image display apparatus has several heat generating elements. One of the heat generating elements is the image display panel 21. Electrons emitted from the rear plate on the back side are accelerated by a high voltage and collide with the metal conductive film on the face plate, and the RGB phosphor film emits light and displays an image. Power consumption at a diagonal of 80 inches exceeds about 300W. At that time, the structure of the present invention becomes effective.

  A part of the heat generated in the image display panel 21 is diffused to the surrounding outside air after passing through the front plate 3 through the air layer in the front direction as in the first embodiment. Is directly transmitted to the thermal diffusion sheet 22 that is in close contact with the back surface.

  Another of the heat generating elements is the electric boards 17, but the heat generated in the electric boards 17 is positively dissipated by moving a power board having high power consumption to another housing (not shown). Therefore, there is no need to efficiently transmit the heat diffusion sheet 22 as in the first embodiment.

  The heat generated mainly in the image display panel 21 diffuses rapidly inside the thermal diffusion sheet 22 and is efficiently released from the extension 22-a to the outside air via the heat radiating unit 9 through the same transmission path as in the first embodiment. The

  The characteristics of the present invention described above are summarized as follows.

  A thermal diffusion sheet 22 that is in close contact with the entire rear surface of the image display panel 21 is provided, and a chassis 2 is provided on the rear side of the thermal diffusion sheet 22 to form a laminated structure. Further, an extension portion 22-a of the heat diffusion sheet is provided outside the outer shape of the chassis 2, and a plurality of projections 9-a and recesses 9-b of the heat radiating portion 9 closely contacting the back side of the extension portion 22-a are provided. Exposed outside the body.

  The front side of the extension 22-a is structured to sandwich the heat insulating material 10 with the speaker enclosure 7. The heat dissipating part 9 was fixed to the rear part of the enclosure 7 and the bezel 4 with the heat insulating material 10 and the extension part 22-a sandwiched therebetween.

  In addition, the arrangement of the external terminals 14 corresponds to the arrangement of the recesses 9-b of the heat radiating section 9, and the recesses 9-b are provided so as to be vertically connected in the direction immediately below the positions of the external terminals 14 respectively.

  As a result, the following effects can be obtained.

  1. Heat generated by a large image display panel with a screen size of 55 inches or more can be efficiently absorbed and dissipated outside the housing, and the temperature inside the housing is reduced even when the image display device is in close contact with the wall surface. And improved reliability. In addition, a heat dissipation fan that causes noise is no longer necessary.

  2. The unevenness of the heat dissipation part can be used as a guide for the external connection cable, which solves the appearance and reliability problems such as the image display device floating due to messy cable processing when it is closely attached to the wall, or the cable disconnection did it.

DESCRIPTION OF SYMBOLS 1 Image display panel 2 Chassis 3 Front plate 4 Bezel 5 Rear cover 6 Speaker 7 Enclosure 8 Thermal diffusion sheet 8-a Extension part 8-b Cutting part 9 Heat radiation part 9-a Convex part 9-b Concave part 10 Heat insulation material 11 Power supply board 12 Heating Element 13 Signal Input Board 14 External Terminal 15 Drive Board 16 FPC
17 Electric Boards 18 Heating Element 21 Image Display Panel 22 Thermal Diffusion Sheet 22-a Extension 23 Drive Board 24 FPC
DESCRIPTION OF SYMBOLS 51 Display 52 Support body 53 Electrical board 54 Bezel 55 Back cover 56 Pipe frame 57 Mounting part 58 Heat radiation part 61 Image panel 62 Heat transfer sheet 63 Heat transfer sheet 64 Base part 65 Circuit part 66 Front plate 67 Front frame 68 Case

Claims (4)

  An image display device including an image display module including an image display panel for displaying an image, a support for supporting the image display panel, and electric circuits supported by the support. A heat dissipation structure for an image display device, characterized in that a heat conduction means is provided inside the module, the heat conduction means extends outside the image display module, and a heat dissipation means for contacting the outside air is provided at the extended portion.   2. The heat dissipation structure for an image display device according to claim 1, wherein the heat conducting means is disposed in close contact with the image display panel side surface of the support, the electric circuit side surface, or both surfaces of the support.   3. The image display device according to claim 1, wherein the extended portion is provided with a heat insulating means that is in close contact with a surface opposite to the heat radiating means, and is fixed to a part of the housing structure. Heat dissipation structure.   4. The electrical circuit includes a connection terminal for inputting a signal from the outside, and a concave portion of a heat radiating unit is disposed directly below the connection terminal. A heat dissipation structure for an image display device according to any one of the above.