JP5188245B2 - Display device - Google Patents

Description

  The present invention relates to a display device using, for example, an electron-emitting device, plasma discharge, liquid crystal, a fluorescent display tube, and an organic EL (Electro Luminescence).

  For example, in a display panel of a display device using plasma discharge, a discharge gas is sealed between two glass substrates on which a plurality of matrix-like micro discharge spaces provided with phosphors are arranged. The ultraviolet rays generated by the gas discharge in the minute discharge space are excited, and the visible light generated thereby is displayed on the display panel. Due to this gas discharge, the display panel of the display device becomes high temperature, and the inside of the housing also becomes high due to a circuit board or the like installed on the back surface of the display panel.

  In a display panel of a liquid crystal display device, a liquid crystal substance is filled between two glass substrates provided with transparent electrodes facing each other with a gap, and a voltage is applied to the transparent electrodes to change the alignment state of the liquid crystals. To control the state of light passing there.

  Then, a pattern that appears due to the difference in the amount of light passing therethrough is displayed on the display panel, and the light passing therethrough is illuminated by a backlight using a cold cathode tube or a light emitting diode. For this reason, due to the heat generated by the backlight and the circuit board or the like installed on the back surface of the liquid crystal panel, the inside of the housing becomes hot like a display device using plasma discharge.

  As described above, in a display device or a liquid crystal display device using plasma discharge, since the inside of the housing becomes high temperature, generally, a heat radiating hole is provided in the housing and external air is taken into the housing to heat the housing. The heat is dissipated.

  However, if a heat radiating hole is provided in the housing and external air is taken into the housing, dust contained in the outside air is also taken into the housing, so that dust accumulates on the internal components and dust adheres to the display panel side. Therefore, there is a possibility that problems such as a decrease in image quality and luminance may occur.

  Therefore, a display device having a structure for radiating heat by circulating air in the housing without providing a heat radiating hole in the housing has been proposed (Patent Document 1).

  Referring to FIG. 13, this display device is a display device using plasma discharge, and a dustproof cover 2 is attached so as to cover exhaust port 1 a and intake port 1 b provided on the back side of housing 1. It has been.

  The dust cover 2 is provided with an internal fan 6 that sends the heat in the housing 1 to the bag-shaped heat radiation fin 3 attached to the back surface of the dust cover 2 through the exhaust port 1a. An external fan 7 for cooling the heat radiating fin 3 is provided outside the heat radiating fin 3.

  The high-temperature air sent from the housing 1 into the dust-proof cover 2 through the exhaust port 1 a by the internal fan 6 passes through the inside of the bag-shaped heat-radiating fins 3 and is cooled. It is discharged into the cover 2 and introduced into the housing 1 through the air inlet 1b.

Note that high-temperature air sent from the housing 1 through the exhaust port 1a into the dust-proof cover 2 and the heat radiation fins 3 are discharged into the dust-proof cover 2 and introduced into the housing 1 through the air-intake port 1b. The cooled air is isolated by the sheet 4 and the shielding plate 5.
JP 2004-286940 A

  In Patent Document 1, high-temperature air sent out from the housing 1 into the dust cover 2 is cooled by passing through the heat radiating fins 3. However, in order to increase the cooling efficiency, heat is radiated from the housing 1. It is necessary to arrange the fins 3 as far apart as possible to reduce the influence of heat generated in the housing 1 as much as possible. For this reason, the thickness of the dustproof cover 2 is also added to increase the thickness of the display device, which causes a reduction in thickness and weight of the display device.

  In addition, the air cooled in the radiating fins 3 is introduced into the air inlet 1b through the space below the shielding plate 5, and at this time, a part of the air is in the seat 4, the casing 1, and the shielding plate 5. , And heat is transmitted from the back surface of the housing 1 to be warmed. For this reason, the heat of the warmed air is transmitted into the radiation fin 3 through the sheet 4, and there is a possibility that the radiation efficiency in the radiation fin 3 is reduced.

  In view of the above, an object of the present invention is to provide a display device that can improve heat dissipation efficiency while ensuring dustproofness, and can be reduced in thickness and weight.

In order to achieve the above object, a display device of the present invention is provided on a display panel, a rear cover that is disposed on the back side of the display panel and blocks air in the device from outside air, and circulates air in the device. And an electric circuit board disposed between the display panel and the rear cover, the rear cover including an outer wall part and an inner wall part disposed between the outer wall part and the electric circuit board. The inner wall portion is composed of two sheet metals, a heat insulating layer is formed between the two sheet metals , and the sheet metal on the display panel side of the two sheet metals is the outer wall portion. And a heat dissipation member is provided between the sheet metal on the display panel side and the heat generation source of the electric circuit board, and the fan is a space formed between the display panel and the inner wall portion And the inner wall and the outer wall Wherein the circulating air between the space formed between the.

  According to the display device of the present invention, it is possible to increase the heat dissipation efficiency while ensuring the dustproof property, and to reduce the thickness and weight.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is an external perspective view of a display device according to a first embodiment of the present invention, and FIG. 2 is an exploded perspective view of the display device shown in FIG.

  As shown in FIGS. 1 and 2, the display device 10 according to the present embodiment includes a housing 10 a including a bezel 12, a rear cover 19, and a front plate 13, and a display panel 11 accommodated in the housing 10 a. Have.

  The bezel 12 is provided with an opening 12a corresponding to the image display range. Further, the bezel 12 and the front plate 13 are held between the presser fittings 15 and 16. The presser fittings 15 and 16 are metal fittings for pressing the front plate 13.

  The display panel 11 is a thin image display panel such as an electron-emitting device, plasma discharge, liquid crystal, fluorescent display tube, or organic EL (Electro Luminescence). An electric circuit board 17 is attached to the back surface of the display panel 11.

  FIG. 3 is an exploded perspective view of the rear cover 19, and FIG. 4 is a longitudinal sectional view of the display device 10.

  As shown in FIGS. 3 and 4, the rear cover 19 has an outer wall portion 20 and an inner wall portion 21. The outer wall portion 20 is not provided with a heat radiating hole and is shielded from the outside air, and thus has a structure in which dust does not enter the housing 10a.

  The inner wall portion 21 includes a sheet metal 21a and a sheet metal 21b engaged with the sheet metal 21a, and a sealed air layer 21c functioning as a heat insulating layer between the sheet metal 21a and the sheet metal 21b (see FIG. 4). Is formed.

  Further, the sheet metal 21a of the inner wall portion 21 protrudes upward from the sheet metal 21b, and a mounting hole 21d for mounting the fan 18 that forms a forced air flow toward the outer wall portion 20 is formed in the protruding portion. Several places are provided.

  Then, as shown in FIG. 4, the rear cover 19 is assembled by joining the upper end portion of the sheet metal 21 a of the inner wall portion 21 to the outer wall portion 20. In the assembled state, an opening 19c is formed between the inner wall 21, the lower end, and the outer wall 20, and a space 19b is formed between the back side of the inner wall 21 and the outer wall 20. Is formed.

  The rear cover 19 configured as described above is attached to the bezel 12 via presser fittings 15 and 16 (the presser fitting 16 is not shown in FIG. 4).

  Next, with reference to FIG. 4, the flow of air in the housing 10a of the display device 10 of the present embodiment will be described.

  By driving the fan 18 attached to the inner wall portion 21 of the rear cover 19, the air in the housing 10 a is changed from the space 19 a between the display panel 11 and the inner wall portion 21 as shown by the arrow in FIG. 4 to the rear cover 19. Flows into a space 19b between the outer wall portion 20 and the inner wall portion 21 of the first wall.

  As described above, since the outer wall portion 20 of the rear cover 19 is not provided with a heat radiating hole, the air in the housing 10a does not flow out to the outside, and passes through the space 19b between the outer wall portion 20 and the inner wall portion 21. Descend.

  Then, the air descending the space 19 b again flows into the space 19 a between the display panel 11 and the electric circuit board 17 from the opening 19 c between the outer wall portion 20 and the lower end portion of the inner wall portion 21.

  That is, the air in the space 19a between the display panel 11 and the inner wall portion 21 is warmed and raised by the heat generated by the display panel 11, the electric circuit board 17, and the like. Then, the air heated and raised in the space 19a flows into the space 19b between the outer wall portion 20 and the inner wall portion 21 of the rear cover 19 and is lowered by the fan 18, and the heat of the air passes through the outer wall portion 20 at that time. Through the housing 10a.

  Here, as described above, the sealed air layer 21c is formed between the sheet metal 21a and the sheet metal 21b of the inner wall portion 21 of the rear cover 19, and the air layer 21c is a space 19a in which air circulates. , 19b are isolated and function as a heat insulating layer.

  Thus, in this embodiment, since the sealed air layer 21c is provided inside the inner wall portion 21 of the rear cover 19, the heat of the air heated in the space 19a between the display panel 11 and the electric circuit board 17 is provided. The heat generated by the electric circuit board 17 is insulated by the air layer 21c.

  As a result, the heat on the space 19a side between the display panel 11 and the electric circuit board 17 is less likely to be transferred to the air radiated by descending the space 19b, and the cooling efficiency (heat radiation efficiency) can be increased.

  In addition, the air layer 21c provided inside the inner wall portion 21 of the rear cover 19 can reduce the thermal conductivity over a short distance, so that the heat dissipating side space 19b can be disposed closer to the electric circuit board 17. In addition, the display device 10 can be reduced in thickness and weight.

  Further, the outer wall portion 20 of the rear cover 19 is not provided with a heat radiating hole, and is structured to be shielded from the outside air so that dust does not enter the housing 10a. it can.

(Second Embodiment)
Next, with reference to FIG.5 and FIG.6, the display apparatus which is the 2nd Embodiment of this invention is demonstrated. FIG. 5 is a longitudinal sectional view of a display device according to a second embodiment of the present invention, and FIG. 6 is a transverse sectional view of the display device shown in FIG. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to a figure and the description is abbreviate | omitted.

  In the present embodiment, as shown in FIGS. 5 and 6, a heat sink 22 is provided on the outer wall portion 20 of the rear cover 19.

  The heat sink 22 is provided with fins 22 a exposed to the outside air outside the outer wall portion 20 and fins 22 b exposed to the space 19 b inside the outer wall portion 20.

  When the air heated in the space 19a on the electric circuit board 17 side by the drive of the fan 18 flows into the space 19b between the outer wall portion 20 and the inner wall portion 21 of the rear cover 19, the heat of the air is absorbed by the fins 22a and 22 of the heat sink 22. Heat is radiated to the outside air through the fins 22b. Thereby, combined with the heat insulating effect of the air layer 21c, the cooling efficiency can be further increased.

  Note that a higher cooling effect can be obtained by using a material having a high thermal conductivity such as aluminum or copper as the material of the heat sink 22. Other configurations and operational effects are the same as those of the first embodiment.

(Third embodiment)
Next, with reference to FIG.7 and FIG.8, the display apparatus which is the 3rd Embodiment of this invention is demonstrated. FIG. 7 is a longitudinal sectional view of a display device according to a third embodiment of the present invention, and FIG. 8 is a transverse sectional view of the display device shown in FIG. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to a figure and the description is abbreviate | omitted.

  In the present embodiment, as shown in FIGS. 7 and 8, the arrangement of the sheet metal 21a and the sheet metal 21b of the inner wall portion 21 of the rear cover 19 is reversed with respect to the first embodiment, and the sheet metal 21b is It faces the space 19b on the cooling side.

  The sheet metal 21a is always exposed to high-temperature heat on the electric circuit board 17 side, and the heat transferred to the sheet metal 21a spreads in the horizontal direction (left and right direction in FIG. 8) along the surface of the sheet metal 21a. It is transmitted to the joint with the outer wall 20 that is continuous with the sheet metal 21a, and is radiated to the outside air through the outer wall 20.

  Further, when there is a high-temperature heat source on the electric circuit board 17, a heat radiating sheet 29 is installed at that location, and the heat radiating sheet 29 is in contact with the sheet metal 21a.

  Thereby, the heat from the electric circuit board 17 is transmitted to the sheet metal 21a through the heat radiating sheet 29, and the heat transmitted to the sheet metal 21a spreads in the horizontal direction (left and right direction in FIG. 8) with the outer wall portion 20. It is transmitted to the joint portion and is radiated to the outside air through the outer wall portion 20.

  The heat of the sheet metal 21a is not easily transmitted to the sheet metal 21b by the air layer 21c inside the inner wall part 21, but a sheet having low thermal conductivity is interposed at the joint between the sheet metal 21a and the sheet metal 21b. It is also possible to further prevent heat from being transmitted from the sheet metal 21a to the sheet metal 21b. Other configurations and operational effects are the same as those of the first embodiment.

(Fourth embodiment)
Next, with reference to FIG. 9, the display apparatus which is the 4th Embodiment of this invention is demonstrated. FIG. 9 is a cross-sectional view of a display device according to the fourth embodiment of the present invention. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to a figure and the description is abbreviate | omitted.

  Depending on the height of the components mounted on the electric circuit board 17, the inner wall portion 21 may not have a double structure over the entire rear cover 19 as in the first embodiment. The rear cover 19 includes an outer wall portion 20 and two inner wall portions 21.

  That is, two cooling-side spaces 19b are formed apart from each other in the lateral direction (left-right direction in the figure), and the high-temperature air on the electric circuit board 17 side is supplied to the two spaces 19b by the fans 18 of the two inner walls 21. Divided into flows.

  In the present embodiment, the rear cover 19 is constituted by the outer wall portion 20 and the two inner wall portions 21, but the rear cover 19 is constituted by the outer wall portion 20 and the three or more inner wall portions 21. Also good. Other configurations and operational effects are the same as those of the first embodiment.

(Fifth embodiment)
Next, with reference to FIG. 10, the display apparatus which is the 5th Embodiment of this invention is demonstrated.
FIG. 10 is a longitudinal sectional view of a display device according to the fifth embodiment of the present invention. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to a figure and the description is abbreviate | omitted.

  In this embodiment, an air layer is not formed between the sheet metal 21 a and the sheet metal 21 b of the inner wall portion 21 of the rear cover 19, but a heat insulating material 35 is loaded.

  The heat insulating material 35 uses, for example, a polystyrene or other member having low thermal conductivity, thereby lowering the thermal conductivity of the inner wall portion 21, and high-temperature heat on the electric circuit board 17 side is a space on the cooling side. 19b is further difficult to be transmitted. Other configurations and operational effects are the same as those of the first embodiment.

(Sixth embodiment)
Next, with reference to FIG.11 and FIG.12, the display apparatus which is the 6th Embodiment of this invention is demonstrated. FIG. 11 is a longitudinal sectional view of a display device according to a sixth embodiment of the present invention, and FIG. 12 is a transverse sectional view of the display device shown in FIG. In addition, about the part which overlaps or corresponds to the said 1st Embodiment, the same code | symbol is attached | subjected to a figure and the description is abbreviate | omitted.

  In the present embodiment, a water-cooled pipe 39 is used instead of the fan 18 as shown in FIGS.

  The water-cooled pipe 39 is installed so as to surround the entire circumferential area in the vertical direction (vertical direction in FIG. 11) in a part of the inner wall 21 of the rear cover 19 in the horizontal direction (horizontal direction in FIG. 12). The water cooling pipe 39 is filled with a liquid refrigerant in order to dissipate the heat in the housing 10a. The refrigerant circulates around the inner wall portion 21 by the pump 40 in the clockwise direction as indicated by an arrow in FIG.

  The water cooling pipe 39 is in contact with a plurality of ICs 41 arranged on the electric circuit board 17, and the heat generated in the IC 17 is transmitted to the water cooling pipe 39 and further transmitted to the refrigerant in the water cooling pipe 39.

  Then, when the refrigerant in the water-cooled pipe 39 rises along the electric circuit board 17 side of the inner wall 21 and reaches the upper side of the inner wall 21, the refrigerant descends along the outer wall 20 and radiates heat through the outer wall 20. Is done.

  The refrigerant descending in the water cooling pipe 39 along the outer wall 20 side is pushed out by the pump 40 and circulated again to the electric circuit board 17 side.

  At this time, since the air layer 21 c is provided inside the inner wall portion 21, the heat on the electric circuit board 17 side with respect to the refrigerant on the heat radiation side descending along the outer wall portion 20 side in the water cooling pipe 39. It is difficult to transmit and can efficiently dissipate heat.

  In the present embodiment, the fan 18 is omitted, but the fan 18 may be provided to further increase the heat dissipation efficiency, and a heat sink is provided on the outer wall portion 20 as shown in FIGS. The heat radiation efficiency may be further enhanced by expanding the surface area by providing the surface. Other configurations and operational effects are the same as those of the first embodiment.

  In addition, this invention is not limited to what was illustrated by said each embodiment, In the range which does not deviate from the summary of this invention, it can change suitably.

1 is an external perspective view of a display device according to a first embodiment of the present invention. It is a disassembled perspective view of the display apparatus shown in FIG. It is a disassembled perspective view of a rear cover. It is a longitudinal cross-sectional view of the display apparatus shown in FIG. It is a longitudinal cross-sectional view of the display apparatus which is the 2nd Embodiment of this invention. It is a cross-sectional view of the display device shown in FIG. It is a longitudinal cross-sectional view of the display apparatus which is the 3rd Embodiment of this invention. It is a cross-sectional view of the display device shown in FIG. It is a cross-sectional view of the display apparatus which is the 4th Embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus which is the 5th Embodiment of this invention. It is a longitudinal cross-sectional view of the display apparatus which is the 6th Embodiment of this invention. It is a cross-sectional view of the display apparatus shown in FIG. It is a longitudinal cross-sectional view for demonstrating the conventional display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display apparatus 10a Housing | casing 11 Display panel 12 Bezel 13 Front plate 15,16 Holding bracket 17 Electric circuit board 18 Fan 19 Rear cover 20 Outer wall part 21 Inner wall part 21a Sheet metal 21b Sheet metal 21c Air layer 22 Heat sink 22a Fin 22b Fin 29 Heat radiation sheet 35 Insulation 39 Water-cooled pipe 40 Pump 41 IC

Claims (7)

A display panel;
A rear cover that is disposed on the back side of the display panel and blocks air in the device from outside air;
A fan for circulating the air in the device;
An electric circuit board disposed between the display panel and the rear cover ,
The rear cover includes an outer wall portion, and an inner wall portion disposed between the outer wall portion and the electric circuit board ,
The inner wall portion is composed of two sheet metals, a heat insulating layer is formed between the two sheet metals , and the sheet metal on the display panel side of the two sheet metals is joined to the outer wall portion, A heat dissipation member is provided between the sheet metal on the display panel side and the heat source of the electric circuit board,
The fan circulates air between a space formed between the display panel and the inner wall portion and a space formed between the inner wall portion and the outer wall portion. apparatus. The display device according to claim 1 , wherein a member having a lower thermal conductivity than that of the sheet metal is interposed at a joint between the two sheet metals .   The display device according to claim 1, wherein a sealed air layer formed inside the inner wall portion or a heat insulating material loaded inside the inner wall portion functions as the heat insulating layer. .   The display device according to claim 1, wherein the outer wall portion is not provided with a heat radiating hole for allowing the air in the device to flow outside. Wherein the outer wall portion, the heat sink comprising fins exposed to the space between the fins and the outer wall portion exposed to the outside air and the inner wall portion is provided et the one any of claims 1 to 4, characterized in that The display device according to item. The display device according to claim 1 , wherein a plurality of the inner wall portions are disposed between the outer wall portion and the display panel . A pump for circulating the refrigerant in the device;
The pump circulates a refrigerant filled in a pipe disposed so as to surround a part of the inner wall portion,
The display device according to claim 1 , wherein a heat source of the electric circuit board contacts the pipe .

Images