JP2006227427A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device, having superior operating stability and reliability by having a driver unit in a casing inside radiate properly, thereby preventing a high temperature part from generating locally. <P>SOLUTION: The display device comprises display panels 1 and 2, a heat conductive member 3 and a flexible heat conductive material 4 as a first radiating member arranged on the rear face of the display panel, and a driver unit 5 as the driver unit laminated on the flexible heat conductive material 4. In addition, a metal radiation plate 7 as a second radiating member is arranged on the other face of the driver unit 5. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a display device using a flat panel display panel, and more particularly to measures for heat dissipation around a driver unit.

Currently, a flat panel display (FPD) main body represented by a plasma display panel (PDP) and a liquid crystal display (LCD) is connected to a driver unit in which a driver IC is mounted on a driving circuit board, and this is connected to a casing. Display devices that are housed are becoming widespread.
The display device is capable of increasing the screen size while saving space compared to a conventional CRT display device or the like, and the market is rapidly expanding as a home television device or an information display device in a facility. .

  By the way, in recent years, various display devices have come to have high definition screens, and in order to realize this, the display device also increases the number of scanning lines (number of cells) of the FPD main body and performs high-speed image processing. A driver unit for displaying is used. For this reason, especially the driver unit is subjected to a considerable burden during driving, and may generate a high temperature due to heat generation.

Therefore, in the display device, for example, as shown in Patent Document 1, a metal chassis is disposed as a planar member on the back surface of the FPD main body inside the housing, and one main surface is thermally coupled to the other of the metal chassis. The structure which thermally couples the driver unit which is a driver unit with respect to the main surface of is disclosed. With such a configuration, the driver unit is connected to the metal chassis, and the heat dissipation effect is obtained by utilizing the heat conduction of the metal chassis.
Japanese Patent Laid-Open No. 10-260641

However, in the conventional heat dissipation measures disclosed in Patent Document 1 and the like, in practice, heat dissipation from the driver unit tends to concentrate locally in the region of the metal chassis where the driver unit is thermally coupled. As a result, the heat is trapped and the driver unit cannot sufficiently dissipate heat.
In the countermeasure method, the FPD main body portion corresponding to the driver unit may be exposed to a high temperature with the metal chassis interposed therebetween. For this reason, the operational stability and reliability of the display failure due to the local temperature rise of the display panel is reduced, the risk of the display panel being damaged, and the operational stability and reliability of the display device due to the temperature rise of the driver unit. It becomes a problem.

This problem is expected to become even more serious because the heat generation amount of the driver unit is expected to increase with future increases in the size, definition, and brightness of the display device. In addition, when the driver unit is arranged only on either the upper part or the lower part of the display panel and the display panel is driven, the amount of heat generated by the driver unit further increases.
The present invention has been made in view of the above problems, and by preventing the driver unit inside the housing from dissipating heat well, it is possible to prevent the occurrence of high-temperature parts locally, and to have excellent operational stability and reliability. It is an object of the present invention to provide a display device capable of exhibiting characteristics.

To achieve the above object, the present invention provides a display device comprising a flat panel display and a driver unit connected to the flat panel display, wherein a first heat radiating member is provided on one surface of the driver unit. The second heat radiating member is disposed on the other surface of the driver unit.
Here, the flat panel display refers to a display panel built in the display device.

Here, the first heat radiating member is composed of a planar first heat conducting member disposed facing the flat panel display side, and a flexible heat conducting material laminated on the first heat conducting member. Can do.
The second heat radiating member may be a metal heat radiating plate.
Furthermore, it is desirable that an envelope volume of the metal heat sink with respect to the entire display device is 60 cm ³ or more.

In addition, the driver unit in which the second heat radiating member is arranged may have a configuration having a high emissivity, or a configuration in which a high emissivity member is disposed on the second heat radiating member.
In this case, it is desirable that the emissivity is 0.8 or more.
Further, a configuration in which at least an area corresponding to the driver unit of the casing has an emissivity of 0.8 or more inside the casing, or a high emissivity member having an emissivity of 0.8 or more is arranged in the area. It can be set as the installed structure.

In the present invention, a flat panel display and a driver unit connected to the flat panel display are housed in a housing, and the second heat radiating member is disposed so as to come into contact with the driver unit. It can also be set as the structure which comprises a part.
Here, the second heat radiating member may further include a flexible heat conductive material thermally coupled to both the driver unit and the housing portion.

The heat conductivity of the flexible heat conductive material is preferably in the range of 0.5 W / m · K to 10 W / m · K.
In addition, the other surface of the driver unit may be connected to the first heat conductive member via a second heat conductive member.
Here, the heat conductivity of the second heat conducting member may be anisotropic. Specifically, the second heat conducting member can be made of a carbon material.

  As described above, in the present invention, since the heat dissipating members are provided on both sides of the driver unit which is the driver unit, the conventional structure in which the heat dissipating member such as a metal chassis is provided on one surface of the board is used. Compared with this, the temperature rise of the driver unit can be reduced well. As a result, the heat from the driver unit is diffused in the respective heat dissipating members arranged on both sides of the substrate, and no high temperature portion is locally generated. Therefore, the heat influence on the display panel due to the concentration of the heat generation is prevented. Can be reduced.

Therefore, the effect of improving the operational stability and reliability of the display device can be expected under good heat dissipation measures.
Furthermore, according to the present invention, the influence of heat from the driver unit to the display panel can be reduced, and the local temperature rise of the display panel can be reduced, so that the occurrence of problems such as display defects and display panel breakage is reduced.

  In addition, according to the present invention, since a flexible (that is, elastic) heat conductive material is used, it is possible to satisfactorily adhere to a driver unit having unevenness on the surface. The thermal adhesion with the conductive member can be dramatically improved, and the amount of heat transfer from the driver unit to the heat conductive member can be increased. As a result, the temperature rise of the driver unit can be suppressed compared to the conventional case.

Embodiments of the present invention will be described below with reference to the drawings.
(Embodiment 1)
FIG. 1 is a partial cross-sectional view of a display device according to Embodiment 1 of the present invention.
The display device shown in FIG. 1 includes display panels 1 and 2 constituting a flat panel display, a heat conductive member 3 as a first heat radiating member and a flexible heat conductive material 4 disposed on the back surface of the display panel 2. And a driver unit 5 laminated on the flexible heat conductive material 4. A metal heat radiating plate 7 is disposed on the other surface of the driver unit 5 as a second heat radiating member.

Further, the driver unit 5 and the display panel 1 are provided with a flexible substrate 6 that is electrically connected to each other. Each of these components 1-7 is accommodated in a rear cover 9 that is a casing. A vent hole 8 communicating with the inside of the rear cover 9 is formed on the back surface of the rear cover 9 so that heat can be effectively radiated from the inside.
Here, the display panels 1 and 2 are illustrated assuming a front panel and a back panel in a known PDP configuration, but the FPD used in the present invention is not limited to the PDP, but is an LCD, an organic EL display, an FED. (Field emission display) or the like may be used.

In addition, in order to improve the adhesiveness with respect to the driver unit 5, the flexible heat conductive material 4 has a silicone (silicon) resin as a material, for example. The member is preferably in the form of rubber, paste or oil. Similarly, ethylene-propylene rubber is desirable.
Here, in the first embodiment, the driver unit 5 is connected to the heat conducting member 3 via the flexible heat conducting material 4 and further provided with the metal heat radiating plate 7, thereby providing the following two effects. It is characterized in that it can be obtained.

That is, as a first effect, the adhesion between the driver unit 5 and the heat conducting member 3 is improved, and the contact area between the driver unit 5 and the heat conducting member 3 is further increased, so that the amount of heat transfer is greatly increased as compared with the conventional case.
That is, by using the flexible heat conductive material 4 having the above-described configuration, the amount of heat transfer from the driver unit 5 to the heat conductive member 3 is effectively increased, and the temperature rise of the driver unit 5 is reduced by the flexible heat conductive material. Compared with the case where 4 is not interposed, it can suppress significantly.

  In addition, the driver unit 5 is normally disposed on both the upper and lower sides of the display panels 1 and 2, but in the future, it becomes possible to drive the display panels 1 and 2 only on one side, thereby reducing the cost. It is expected to become mainstream from the viewpoint. In that case, it is desirable to arrange the display panels 1 and 2 below. This is because hot air always accumulates in the upper part of the housing due to buoyancy, and the temperature of the upper part of the display panels 1 and 2 is higher than that of the lower part. Therefore, the temperature of the heat conducting member 3 is higher at the upper part than at the lower part.

When the driver unit 5 is arranged at the lower part and connected to the heat conducting member 3, the amount of heat transfer from the driver unit 5 to the heat conducting member 3 is increased as compared with the case where the driver unit 5 is arranged and connected to the upper part. Temperature rise can be suppressed.
If the heat conductivity of the flexible heat conducting material 4 is 0.5 to 10 W / m · K, it has elasticity that can sufficiently improve the adhesion and can secure a sufficient amount of heat transfer. The temperature rise of the temperature can be further suppressed, and the operational stability and reliability of the driver unit 5 can be improved.

  As shown in FIG. 2, the driver unit 5 may be connected to the protruding portion of the heat conducting member 3 via a flexible heat conducting material 4. In this case as well, the same effect as in the configuration of FIG. 1 can be obtained. However, in the configuration of FIG. 2, the contact area between the driver unit 5 and the heat conducting member 3 is small, so the temperature of the driver unit 5 is lower than that of the first embodiment. Easy to rise. However, it can be said that the structure shown in FIG. Regarding the configuration related to the heat dissipation measures of the second, third, and fourth embodiments, it is also conceivable that the driver unit 5 is disposed on the protruding portion of the heat conducting member 3 as shown in FIG.

Further, as a second effect, in the first embodiment, the metal heat sink 7 is disposed on the other surface of the driver unit 5 so that the heat of the driver unit 5 passes through the metal heat sink from the other surface. Heat is radiated to the air by convection, and the heat dissipation effect is dramatically higher than before.
Thus, in this Embodiment 1, since it has the structure which thermally radiates from both surfaces of the driver unit 5, the temperature rise of the driver unit 5 can further be suppressed.

Furthermore, since the amount of heat transfer to the heat conducting member 3 is reduced by having the metallic heat radiating plate 7, the temperature rise of the heat conducting member 3 and the display panels 1 and 2 is suppressed, and the local area of the display panels 1 and 2 is suppressed. An increase in temperature can be avoided, and the operational stability and reliability of the display panels 1 and 2 can be improved.
In addition, by disposing a flexible heat conductive material on the surface of the metal heat sink 7 that contacts the driver unit 5, the adhesion between the driver unit 5 and the metal heat sink 7 is improved, and the contact area is further increased and transmitted. This is desirable because the amount of heat increases. In this case, the temperature rise of the driver unit 5 can be further suppressed, and the occurrence of uneven temperature distribution due to the local temperature rise of the display panels 1 and 2 can be reduced.

Furthermore, it is desirable to increase the envelope volume by disposing a plurality of fins or the like on the metal heat radiating plate 7 because the contact area between the metal heat radiating plate 7 and air increases, and the amount of heat released by convection increases.
Note that it is desirable that the envelope volume is 60 cm ³ or more for the entire display device because a sufficient amount of heat radiation can be secured. The upper limit of the numerical value can be appropriately set depending on the size of the display device.
(Embodiment 2)
Next, FIG. 3 shows a display device according to Embodiment 2 of the present invention.

The second embodiment is characterized in that, unlike the first embodiment, a high emissivity member 10 is provided instead of using a simple metal heat radiating plate 7 on the other surface of the driver unit 5. Thereby, the heat of the driver unit is radiated as electromagnetic waves by the high radiation member 10.
That is, in the second embodiment, similarly to the first embodiment, the structure in which heat is radiated from both sides of the driver unit 5 can suppress the temperature increase of the driver unit better than the conventional one. Furthermore, in this Embodiment 2, since the amount of heat transfer to the heat conducting member 3 can be further reduced by using the high emissivity member 10, the temperature rise of the heat conducting member 3 and the display panels 1 and 2 is further suppressed accordingly. Is done. In addition, since the effect of suppressing the temperature rise is high in this way, even if nonuniformity occurs in the temperature distribution of the display panels 1 and 2, it is possible to minimize the influence due to the occurrence of a local high temperature. As a result, the operational stability and reliability of the display panels 1 and 2 can be improved.

The high emissivity material 10 can be configured by using a ceramic material or a metal material with a black anodized surface.
In the second embodiment, it is desirable to dispose a high emissivity material on the inner surface of the rear cover 9 that faces the high emissivity material 10 disposed in the driver unit 5. Thereby, the temperature rise of the driver unit can be further suppressed, and the effect of reducing the adverse effect due to the non-uniformity of the temperature distribution of the display panel is increased.

If the emissivity of these high emissivity materials 10 is 0.8 or more, it is desirable because sufficient heat transfer can be expected by radiation.
Further, in the method of radiating heat with the metal heat sink 7 shown in the first embodiment, it is necessary to increase the envelope volume of the metal heat sink 7 to some extent in order to obtain a good effect. In the method using the emitted radiation, it is not necessary to increase the envelope volume, which can greatly contribute to thinning and space saving of the display device.
(Embodiment 3)
FIG. 4 shows a display device according to Embodiment 3 of the present invention. In FIG. 4, the display device includes a flexible heat conductive material 4 disposed on both sides of the driver unit 5, and the rear cover 9 and the driver unit 5 are thermally coupled via one of the flexible heat conductive materials 4. Thus, the arrangement is characterized.

Thereby, in addition to the effect that the driver unit 5 conducts heat to the heat conducting member 3 described in the first embodiment and radiates heat, the other surface is also radiated to the rear cover 9 via the flexible heat conducting material 4. . The heat transmitted to the rear cover 9 is finally radiated to the outside air.
As described above, the third embodiment can further suppress the temperature rise of the driver unit 5 by having a structure for radiating heat from both sides of the driver unit 5. Further, since the amount of heat transfer to the heat conducting member 3 is reduced by being transferred to the rear cover 9, the temperature rise of the heat conducting member 3 and the display panels 1 and 2 is suppressed, and the local area of the display panels 1 and 2 is suppressed. The uneven temperature distribution due to the generation of high temperature can be reduced, and the operational stability and reliability of the display panels 1 and 2 can be improved.

The rear cover 9 preferably has as high a thermal conductivity as possible, and examples thereof include aluminum and iron. Further, by using an anisotropic heat conductive member (for example, a graphite sheet) between the rear cover and the flexible heat conductive material 4, it is possible to equalize the temperature of the rear cover, and a safer display device can be provided.
In addition, since the heat transfer amount is the largest in the third embodiment using conduction, compared with the double using the convection and radiation described in the first and second embodiments, the temperature increase of the driver unit 5 is suppressed, and the display panel 1 is used. 2 soaking can be achieved. Further, a space as in the case of using convection is not necessary, and the third embodiment is desirable from the viewpoint of space saving.
(Embodiment 4)
FIG. 5 shows a display device according to Embodiment 4 of the present invention (rear cover 9 is omitted).

In the display device shown in FIG. 5, the heat conducting member 11 is disposed on the other surface of the driver unit 5 connected to the flexible heat conducting material 4, and the driver unit 5 is interposed via the heat conducting member 11. It is characterized in that it is connected to the heat conducting member 3.
Thereby, the driver unit 5 can dissipate heat from the heat conducting member 11 to the heat conducting member 3 in addition to the effect of conducting heat to the heat conducting member 3 described in the first embodiment to dissipate heat. An effect is produced.

The heat conducting member 11 preferably has a larger thermal conductivity in the plane direction than the thermal conductivity in the thickness direction. For example, a graphite sheet made of a carbon material can be considered.
Furthermore, it is desirable that the contact point between the heat conducting member 11 and the heat conducting member 3 be as far as possible from the driver unit. This is because heat is transmitted from the driver unit 5 to the heat conducting member 3 through the flexible heat conducting material 4, and thus the temperature of the heat conducting member 3 rises in the vicinity of the driver unit 5. As described above, when the contact point between the heat conducting member 11 and the heat conducting member 3 is as far as possible from the driver unit, the temperature of the heat conducting member 3 is lower than that of the configuration arranged in the vicinity, and the heat conducting member 11 is The amount of heat transfer to the heat conducting member 3 increases. Further, also from the viewpoint of soaking the display panels 1 and 2, it is desirable that the contact portion between the heat conducting member 11 and the heat conducting member 3 is as far as possible from the driver unit.
(Example)
Hereinafter, the result of conducting a comparative verification experiment of heat dissipation efficiency using the display device of the present invention will be described.
<Example 1>
As shown in FIG. 6, the driver unit 5 of the display device and the Al heat conduction member 3 (thickness 1.5 mm) are brought into close contact with each other through the silicone paste 4, and the surface of the driver unit 5 two hours after the start of driving of the display device. The temperature was measured with a thermocouple.
<Example 2>
As shown in FIG. 7, the driver unit 5 of the display device and the Al heat conduction member 3 (thickness 1.5 mm) are brought into close contact with each other through the silicone paste 4, and the other surface of the driver unit 5 is attached to the graphite sheet (thickness). The surface temperature of the driver unit 5 after 2 hours from the start of driving the display device was measured with a thermocouple.
<Conventional example>
For comparison with Examples 1 and 2, the surface temperature of the driver unit 5 in the conventional display device shown in FIG. The Al heat conducting member 3 has a protrusion, and the driver unit 5 is connected to the protrusion by a screw 12. Further, the contact surface between the driver unit 5 and the heat conducting member 3 is not in contact with a flexible heat conducting material, but is simply in contact with it.
The temperature measurement results in Examples 1 and 2 and the conventional example are summarized in Table 1 using the conventional example as a reference temperature.

当図に示すように、本発明の表示装置は、従来の放熱構造を有する表示装置と比べ、実施例１では20.1℃、実施例２では29.8℃低下することがわかった。これは実施例１では、ドライバユニット５とＡｌ製熱伝導部材３の接触面積を増加させ、さらに、界面にシリコンペーストを介在させ密着性を向上させたことにより、ドライバユニット５からＡｌ製熱伝導部材３への伝熱量が増加したためと考えられる。さらに、実施例２では、ドライバユニット５の両面からＡｌ製熱伝導部材３に伝導させたため、より大きな効果が見られた。

As shown in this figure, it was found that the display device of the present invention is 20.1 ° C. lower in Example 1 and 29.8 ° C. in Example 2 than the display device having a conventional heat dissipation structure. In the first embodiment, the contact area between the driver unit 5 and the Al heat conduction member 3 is increased, and the adhesion is improved by interposing a silicon paste at the interface. This is probably because the amount of heat transfer to the member 3 has increased. Furthermore, in Example 2, since it was made to conduct to the Al heat conductive member 3 from both sides of the driver unit 5, a greater effect was seen.

This time, the effects of Examples 1 and 2 were verified by experiment, but it is considered that the same effects can be obtained for any of the first to fourth embodiments described above. In the future, if the display device is increased in size and definition, the difference in effect from the conventional structure is expected to increase further.
Further, the present invention is applied to a flat panel display (FPD) display device typified by a liquid crystal display (LCD) display device, a field emission display (FED) display device and the like in addition to a plasma display panel (PDP) display device. can do.

The display device according to the present invention can be used, for example, as a home television device that is a thin image display device using a PDP or an information display device in a facility.
In particular, in the present invention, since the heat dissipation effect of the driver unit is high, it is very effective to be applied to a display device that requires good operational stability and reliability.

It is sectional drawing which shows the display apparatus of Embodiment 1 of this invention. It is sectional drawing which shows the display apparatus of Embodiment 1 of this invention. It is sectional drawing which shows the display apparatus of Embodiment 2 of this invention. It is sectional drawing which shows the display apparatus of Embodiment 3 of this invention. It is sectional drawing which shows the display apparatus of Embodiment 4 of this invention. It is sectional drawing which shows the display apparatus of Example 1 of this invention. It is sectional drawing which shows the display apparatus of Example 2 of this invention. It is sectional drawing which shows a display apparatus provided with the structure which concerns on the conventional heat dissipation countermeasure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Display panel 3 Heat conduction member 4 Flexible heat conduction material 5 Driver unit 6 Flexible board 7 Metal heat sink 8 Vent 9 Back cover 10 High emissivity member 11 Heat conduction member 12 Screw

Claims (13)

A display device comprising a flat panel display panel and a driver unit connected to the flat panel display,
A display device, wherein a first heat radiating member is disposed on one surface of the driver unit, and a second heat radiating member is disposed on the other surface of the driver unit. The first heat radiating member is composed of a planar first heat conducting member disposed opposite to the flat panel display side, and a flexible heat conducting material laminated on the first heat conducting member. The display device according to claim 1. The display device according to claim 2, wherein the second heat radiating member is a metal heat radiating plate. The display device according to claim 3, wherein an envelope volume of the metal heat radiating plate with respect to the entire display device is 60 cm ³ or more. The display according to claim 2, wherein the driver unit in which the second heat radiating member is arranged has a configuration having a high emissivity, or a configuration in which a high emissivity member is disposed on the second heat radiating member. apparatus. The display device according to claim 5, wherein the emissivity is 0.8 or more. Inside the casing, at least a region corresponding to the driver unit of the casing has a configuration having an emissivity of 0.8 or more, or a high emissivity member having an emissivity of 0.8 or more is disposed in the region. The display device according to claim 6. A flat panel display and a driver unit connected to the flat panel display are housed in a housing,
The display device according to claim 2, wherein the second heat radiating member includes a housing portion arranged so as to come into contact with the driver unit. The display device according to claim 8, wherein the second heat radiating member further includes a flexible heat conductive material thermally coupled to both the driver unit and the housing portion. The display device according to claim 9, wherein the heat conductivity of the flexible heat conductive material is in the range of 0.5 W / m · K to 10 W / m · K. The display device according to claim 2, wherein the other surface of the driver unit is connected to the first heat conductive member via a second heat conductive member. The display device according to claim 11, wherein the thermal conductivity of the second thermal conductive member has anisotropy. The display device according to claim 12, wherein the second heat conducting member is made of a carbon material.

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