WO2012098899A1

WO2012098899A1 - Display device

Info

Publication number: WO2012098899A1
Application number: PCT/JP2012/000332
Authority: WO
Inventors: 毅太平; 栄有賀; 久昇佐々木
Original assignee: パナソニック株式会社
Priority date: 2011-01-21
Filing date: 2012-01-20
Publication date: 2012-07-26

Abstract

This display device has a light source, a reflecting plate that reflects light from the light source toward the front surface side, a heat dissipating plate, which is in close proximity to the light source with a part thereof being disposed in a prescribed position on the back surface side of the reflecting plate, and a back cover that is in close proximity to a prescribed surface of the heat dissipating plate that is on part of the heat dissipating plate and on the opposite side from the reflecting plate and covers the entire reflecting plate.

Description

Display device

The present invention relates to a display device. Specifically, the present invention relates to a display device having a structure for efficiently removing heat from a heat source of a display device such as a light emitting diode (LED).

Heretofore, various proposals have been made for a method of dissipating heat from a backlight used in a non-light emitting display device such as a liquid crystal display device.

For example, it is disclosed that heat generated from the light emitting diode group, which is a heat source, is efficiently dissipated to achieve uniform temperature distribution over the entire surface of the display panel (see, for example, Patent Document 1).

Here, in the conventional display device, mounting of a printed circuit board or an electronic component is performed on the back surface of the display panel. Furthermore, the display panel was covered by the back cover. Thus, the heat radiation from the display panel is accumulated inside the display device. That is, even in the case where exhaust heat is efficiently conducted in a single display panel, exhaust heat from a heat source can not be efficiently realized in the entire display device.

Unexamined-Japanese-Patent No. 2006-302581

The display device according to the present invention comprises a light source, a reflector for reflecting light from the light source to the front side, a heat sink near the light source, and a radiator plate partially disposed at a predetermined position on the back side of the reflector, And a back cover which is close to a predetermined surface of the heat sink opposite to the reflector and which partially covers the reflector.

According to such a configuration, the exhaust heat from the light source which is the heat source in the display panel can be efficiently performed.

FIG. 1A is a perspective view from the front side of a display device according to

Embodiments

1 and 2 of the present invention. FIG. 1B is a perspective view from the back side of the display device according to

Embodiments

1 and 2 of the present invention. FIG. 2A is a perspective view from the front side of a back cover used in the display device according to

Embodiments

1 and 2 of the present invention. FIG. 2B is a perspective view from the back side of the back cover used in the display device according to

Embodiments

1 and 2 of the present invention. FIG. 3A is a perspective view from the front side showing the internal structure of the panel module used in the display device according to

Embodiments

1 and 2 of the present invention. FIG. 3B is a perspective view from the back side of the panel module used in the display device according to

Embodiments

1 and 2 of the present invention. FIG. 4 is a rear view showing a cross section of the display according to the first and second embodiments of the present invention. FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4 according to the first embodiment of the present invention. FIG. 6 is an enlarged view of a part of FIG. 5 according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view taken along line 7-7 of FIG. 4 according to the second embodiment of the present invention. FIG. 8 is an enlarged view of a part of FIG. 7 according to the second embodiment of the present invention. FIG. 9 is a cross-sectional view taken along line 9-9 of FIG. 4 according to the second embodiment of the present invention. FIG. 10 is an enlarged view of a part of FIG. 9 according to the second embodiment of the present invention.

Embodiment 1
Hereinafter, Embodiment 1 of the present invention will be described with reference to the drawings. First, the configuration of the device will be described. FIG. 1A is a perspective view from the front side of a display device 1 according to a first embodiment. FIG. 1B is a perspective view from the back side of the display device 1 according to the first embodiment.

As shown in FIGS. 1A and 1B, the display device 1 displays a video on the liquid crystal panel 2 based on the input video signal or the received broadcast signal. The back cover 3 covers the back of the liquid crystal panel 2. The back cover 3 is preferably formed of metal from the viewpoint of thermal conductivity.

FIG. 2A is a perspective view from the front side of a back cover 3 used in the display device 1 according to the first embodiment. FIG. 2B is a perspective view from the back side of the back cover 3 used in the display device 1 according to the first embodiment. FIG. 3A is a perspective view from the front side showing the internal structure of the panel module 4 used for the display device 1 according to the first embodiment. FIG. 3B is a perspective view from the back side of the panel module 4 used in the display device 1 according to the first embodiment. Here, in FIG. 3A, the liquid crystal panel 2 is removed from the panel module 4 in order to represent the internal structure of the panel module 4. Further, when the back cover 3 is removed from the display device 1 of FIG. 1B, the panel module 4 appears as shown in FIG. 3B.

As shown to FIG. 3A, the panel module 4 has LED5 as a light source, LED board 6, and the reflecting plate 7 which reflects the light from LED5 to the front side. The LED 5 is a light source that illuminates the liquid crystal panel 2 (see FIG. 1A) from the back. The LED substrate 6 is a substrate on which the LEDs 5 are mounted and for electrically connecting a drive circuit. In the present embodiment, a plurality of LEDs 5 are linearly arranged on the LED substrate 6. The reflection plate 7 reflects the light from the LED 5 to the front side of the reflection plate 7 to irradiate the entire surface of the liquid crystal panel 2 (see FIG. 1A) with light. The reflecting plate 7 has a substantially arc shape in the depth direction in order to efficiently reflect the light of the LED 5 disposed at the center.

As shown in FIG. 3B, the reflection plate 7 covers the back of the liquid crystal panel 2 (see FIG. 1A), and is disposed in a position where the back cover 3 (see FIG. 1B) covers the entire back. . A heat dissipation plate 8 is attached to the back of the reflection plate 7. A slit (not shown) is formed in the reflection plate 7, and the heat sink 8 is disposed so as to be in contact with the LED substrate 6 at the periphery of the slit. Therefore, the reflecting plate 7 is in close proximity to the LED 5. The material of the heat sink 8 may be suitably selected as long as it is a material having a high thermal conductivity, but aluminum is used in the present embodiment. The arrangement and configuration of the above-described slit portion and the details of the role thereof will be described later.

FIG. 4 is a rear view showing a cross-sectional location of the display device 1 according to the embodiment. In addition, in FIG. 4, the resin cover arrange | positioned at the back surface lower part of the display apparatus 1 is removed. The electronic components and the printed circuit board conventionally disposed on the entire back cover back surface are concentrated at the lower portion of the back cover 3.

FIG. 5 is a cross-sectional view taken along line 5-5 of FIG. 4 according to the first embodiment. As shown in FIG. 5, the back cover 3 is formed by a slope and a plane. Also, the vicinity of the center of the back cover 3 is recessed. Then, one surface near the center of the back cover 3 is in close proximity to the heat sink 8. The printed circuit board 9 is disposed below the back cover 3 in a direction parallel to the horizontal direction.

Next, a portion surrounded by a dotted line in FIG. 5 will be described in detail with reference to FIG. 6 is an enlarged view of a part of FIG. 5 according to the first embodiment. As shown in FIG. 6, in the vicinity of the center of the back cover 3, there is a step formed of a plurality of surfaces. The one surface described above is in close proximity to the center of the heat sink 8. In FIG. 5, one surface near the center is indicated by an arrow 60. That is, the height of the above-described one surface is the length of the arrow 60, and the width of the one surface is the length of the arrow 41 shown in FIG. Further, both ends of the heat sink 8 are fastened by the back cover 3 and a screw 10.

The slit portion 61 is formed in the reflection plate 7. An LED substrate 6 on which the LEDs 5 are mounted is disposed on the back side of the reflecting plate 7 in the portion of the slit portion 61. The heat sink 8 is disposed to be in contact with the LED substrate 6 around the slit portion 61. That is, the heat sink 8 is in proximity to the LED 5 as a light source, and a part of the heat sink 8 is disposed at a predetermined position on the back side of the reflection plate 7. Then, the back cover 3 that covers the entire surface of the reflection plate 7 is close to a predetermined surface of the heat dissipation plate 8 on the opposite side to the reflection plate 7 in the above-described part of the heat dissipation plate 8. With such a configuration, the predetermined surface of the heat dissipation plate 8 is a portion where the heat generated from the LED 5 is most easily conducted through the LED substrate 6 and is close to the reflection plate 7.

Although only one slit portion 61 may be formed, one or more slit portions 61 may be formed to have a predetermined size. The position where the slit portion 61 is formed is preferably a position corresponding to the deepest portion of the reflection plate 7. Then, the heat dissipating plate 8 has the above-described part disposed at a position facing the slit portion 61. As described above, when a plurality of slit portions 61 are formed, it is preferable because the overall strength of the reflection plate 7 is increased as compared with the case where only one slit portion 61 is formed.

Further, the reflection plate 7 has a substantially arc-shaped cross section in the depth direction. And LED5 as a light source is arrange | positioned substantially linear. A part of the heat sink 8 has a planar shape corresponding to the planar shape including the LED 5, and a part thereof is disposed at a position corresponding to the deepest portion of the reflector 7.

Next, the function and effect of the display device in the present embodiment will be described.

First, in the present embodiment, the display device 1 reflects the light of the LED 5 on the front surface side (left side in FIG. 6) of the reflection plate 7, and approaches the LED 5 via the LED substrate 6 and the reflector A heat sink 8 arranged partially from the back surface of the plate 7 and a predetermined surface of the heat sink 8 opposite to the reflector 7 in a part of the heat sink 8, and the entire surface of the reflector 7 The operation effect by having the back cover 3 which covers in a detailed manner will be described.

When the display device 1 is used, the LED 5 consumes a large amount of power and generates heat. Then, the temperature of the bottom of the LED 5 and other surroundings rise. The LEDs 5 are disposed on the LED substrate 6, and the heat from the LEDs 5 is conducted. Then, as the temperature of the bottom surface of the LED 5 and other surroundings rise, the temperature of the LED substrate 6 likewise rises. Therefore, although it is necessary to remove heat from the LED substrate 6, the direction of heat removal should be limited to the back side of the reflector 7. The reason is that since the front surface of the reflection plate 7 is a portion for displaying an image, it is not possible to arrange a part that blocks light. Therefore, the heat dissipation plate 8 is disposed in proximity to the back cover 3 in order to remove the heat of the LED 5 through the LED substrate 6. Thus, the heat generated from the LED 5 is efficiently transmitted to the back cover 3 through the heat sink 8. The surface of the back cover 3 is exposed to the outside air in the state of normal use. Therefore, the exhaust heat is efficiently performed as the entire display device 1.

Conventionally, such a structure was not realized because a large number of electronic components and printed boards existed between the back cover 3 and the reflection plate 7. In order to realize such a structure, the display device 1 according to the present embodiment selectively arranges the electronic components and the printed circuit board at a place different from the place where the back cover 3 and the heat dissipation plate 8 contact. Thus, such a structure can be realized.

Here, that the back cover 3 and the heat sink 8 are in close proximity means that they are in close proximity to the extent that the heat of the heat sink 8 is efficiently transmitted to the back cover 3. Note that the concept of contact is included in the concept of proximity. Therefore, in the present embodiment, the back cover 3 and the predetermined surface of the heat dissipation plate 8 are disposed at a distance of, for example, 0 mm to 1.5 mm. For exhaust heat, it is important to design this distance as narrow as possible. However, as shown in FIG. 6, if a certain clearance is ensured, it is possible to prevent the vibration noise due to the vibration from the speaker (not shown) separately provided to the display device 1 being transmitted to the back cover 3. Therefore, it is desirable from the viewpoint of quietness.

Next, the reflection plate 7 of the display device 1 according to the first embodiment has a substantially arc-shaped cross section in the depth direction, and the LEDs 5 are arranged substantially in a straight line. These illustrate the operation and effect of having a planar shape corresponding to the planar shape including the light source, and having a part thereof disposed at a position corresponding to the deepest part of the reflection plate 7.

When the display device 1 is configured as described above, when the display device 1 is used, the location of the highest temperature in the back cover 3 is near the vertical center of the back cover 3. Then, the back cover 3 having a large surface area can be most efficiently used for exhaust heat. In addition, the possibility that the heat adversely affects the front surface of the display device 1 and surrounding escrow parts can be reduced. Moreover, the effect by having formed the reflecting plate 7 in circular arc shape also has the merit of reflecting the light of LED5 arrange | positioned in the center efficiently.

In addition, as described above, according to the present invention, it is required in the present invention that the electronic component and the printed circuit board be selectively disposed at a place different from the place where the back cover 3 and the heat dissipation plate 8 contact. By forming the reflecting plate 7 in an arc shape as in the present embodiment and forming the back cover 3 substantially along the reflecting plate 7, an empty space is secured in the lower portion of the display device 1 and the back surface of the back cover 3. it can. Then, an electronic component or a printed circuit board can be disposed in the empty space, and the electronic component or the printed circuit board can be selectively disposed at a location different from the location where the back cover 3 and the heat sink 8 contact. .

In addition, since there is no need to form a projection on the back surface of the display device 1 due to the grounding of the electronic component and the printed circuit board, it is possible to contribute to space saving of the display device 1. Here, by appropriately arranging the printed circuit board 9 in the lower part of the back cover 3 in a direction parallel to the horizontal direction as in the present embodiment, it is possible to prevent the display apparatus 1 from being enlarged in the vertical direction.

Further, as in the present embodiment, it is preferable to fasten the heat sink 8 and heat radiation simultaneously by fastening the back cover 3 and the heat radiation plate 8 with the screws 10, which is preferable. At this time, if the distance between the screw 10 and the adjacent screw 10 is reduced, the distance from the heat source to the screw 10 is reduced. Therefore, it is desirable to reduce the distance between the LEDs 5 and to arrange them substantially in a straight line.

Second Embodiment
The second embodiment will be described below with reference to the drawings. The second embodiment is also described using the display device 1 used in the first embodiment. Therefore, the descriptions of the overlapping portions are the same as in Embodiment 1 unless otherwise noted.

First, the configuration of the display device 1 will be described. As shown in FIG. 4, as described in the first embodiment, a part of the back cover 3 which is not in proximity to the heat sink 8 is present. Specifically, the configuration shown in the cross-sectional view taken along line 7-7 in FIG. In the 7-7 cross section of FIG. 4, the back cover 3 is not recessed toward the heat sink 8 side. This is because the back cover 3 has various restrictions and can not be disposed so as to be close to the heat sink 8. In the present embodiment, an example in which it is necessary to secure a screw hole for screwing a metal fitting for hanging the display device 1 on the back surface of the display device 1 will be described as an example.

In FIG. 4, the wall-hanging screw holes 11 formed on the back cover 3 are screw holes for screwing a metal fitting for wall-hanging the display device 1. The back cover 3 has a bulge on the vertical line of the wall-hanging screw hole 11. This is because it is necessary to arrange a wall hanging member 12 having a screw hole corresponding to the wall hanging screw hole 11 between the back cover 3 and the reflecting plate 7.

As shown in FIG. 3B, the member 12 is disposed between the back cover 3 and the reflector 7. The member 12 has a wall screw hole 13 which is a screw hole corresponding to the wall screw hole 11.

7 is a cross-sectional view taken along line 7-7 of FIG. 4 according to the second embodiment. FIG. 8 is an enlarged view of a part of FIG. 7 according to the second embodiment. As shown in FIG. 8, the member 12 has a portion substantially parallel to the liquid crystal panel 2 (see FIG. 1), and is disposed in the back cover 3.

9 is a cross-sectional view taken along line 9-9 of FIG. 4 according to the second embodiment. FIG. 10 is an enlarged view of a part of FIG. 9 according to the second embodiment. As shown in FIG. 10, the member 12 includes a first back cover side proximity portion 14 located close to the back cover 3, a heat radiation portion side contact portion 15 located close to the heat dissipation plate 8, and the back A second back cover side proximity portion 16 which is a portion close to the cover 3 has a continuously formed portion. The first back cover side proximity portion 14, the heat radiating portion side contact portion 15, and the second back cover side proximity portion 16 are connected by a slope. In the member 12, the first leg 17 extending from the first back cover side proximity portion 14 toward the heat dissipation plate 8 and in contact with the heat dissipation plate 8 and the heat radiation from the second back cover side proximity portion 16 A second leg 18 extending towards the plate 8 and in contact with the heat sink 8 is formed and has a substantially M-shaped cross section. In addition, the first leg portion 17 and the second leg portion 18 are heat dissipation portion side contact portions 19 which are portions extending to the opposite side to the heat dissipation portion side contact portion 15 and in proximity to the heat dissipation plate 8; A heat sink side contact portion 20 is formed.

As described above, in the display device 1 according to the present embodiment, the member 12 is disposed between the back cover 3 and the heat dissipation plate 8. And the member 12 has the thermal radiation part

side contact parts

15, 19 and 20 which are places which adjoin to the heat sink 8, and the back cover

side proximity parts

14 and 16 which are places which adjoin to the back cover 3 .

Next, the operation and effect of the display device 1 in the second embodiment will be described. First, in the display device 1 according to the second embodiment, the member 12 is disposed between the back cover 3 and the heat sink 8. Then, the first back cover side proximity portion 14 and the second back cover side proximity portion 16 where the member 12 approaches the back cover 3 and the heat radiation portion side contact portion 15 where the member 12 contacts the heat radiation plate 8 And the effect by having.

As described in the first embodiment, it is desirable that the back cover 3 and the heat sink 8 be close to each other. However, as in the second embodiment, there are cases in which the back cover 3 and the heat sink 8 can not be brought close to each other due to structural factors.

In such a case, by devising the configuration of the member 12 existing between the back cover 3 and the heat dissipation plate 8, or by arranging the member 12 between the back cover 3 and the heat dissipation plate 8, the display device 1 As a whole, exhaust heat can be efficiently performed.

That is, the heat radiating portion side contact portion 15 which receives the heat of the heat radiating plates 8 is formed in the member 12, and the heat radiating portion side contact portion 15 absorbs the heat from the LED 5. Then, the first back cover side proximity portion 14 and the second back cover side proximity portion 16 are formed in the member 12, and the heat of the heat radiating portion side contact portion 15 is dissipated to the back cover 3. In this way, even when the back cover 3 and the heat dissipation plate 8 can not be brought close to each other, the exhaust heat of the heat generated from the LED 5 can be efficiently performed via the member 12.

Next, in the display device 1 according to the second embodiment, the first back cover side proximity portion 14, the heat radiating portion side contact portion 15, and the second back cover side proximity portion 16 are further formed continuously. Explain the effect of As described above, in the second embodiment, heat conduction is performed between the first back cover side proximity part 14 and the second back cover side proximity part 16 and the heat radiation part side contact part 15. Here, when the first back cover side proximity portion 14, the second back cover side proximity portion 16 and the heat radiating portion side contact portion 15 are continuously formed, the heat of the heat radiating portion side contact portion 15 is made the first It disperses to the back cover side proximity part 14 and the second back cover side proximity part 16 and dissipates heat via the path to the first back cover side proximity part 14 and the second back cover side proximity part 16 It is preferable because it can.

Further, as in the present embodiment, when the first back cover side proximity portion 14, the heat radiating portion side contact portion 15, and the second back cover side proximity portion 16 are formed by a slope, the member 12 is drawn. It is desirable from the viewpoint of the strength of the member 12. The first back cover side proximity portion 14, the heat radiating portion side contact portion 15, and the second back cover side proximity portion 16 may be formed so as to be connected not at an inclined surface but at a vertical angle. However, in that case, it is necessary to form using a bending structure. The bending structure is excellent in ease of processing. However, in terms of strength, it is inferior to drawing. In the present embodiment, the angle of the slope is about 45 degrees as measured from the heat sink 8. The angle of the slope can be determined according to the size and distance of the member 12 and the heat radiation plate 8, but it is preferable to set it to 60 degrees or less when performing drawing.

Further, as in the present embodiment, the first leg 17 in which the member 12 extends from the first back cover side proximity portion 14 toward the heat dissipation plate 8 and contacts the heat dissipation plate 8, and the second back A second leg 18 extending from the cover side proximity portion 16 toward the heat dissipation plate 8 and in contact with the heat dissipation plate 8 is formed, and the effect of having a substantially M-shaped cross section will be described. As a premise, the member 12 preferably has a substantially U-shaped cross section in view of strength. Therefore, as in the present embodiment, if the heat radiating portion side contact portion 15 is formed from the central portion of the U-shape, the member 12 is formed to have a substantially M-shaped cross section. Can.

By this, compared with the member which does not have the 1st leg part 17 and the 2nd leg part 18, the member which is excellent in intensity can be formed. In addition, at that time, the first leg portion 17 and the second leg portion 18 extend to the side opposite to the heat radiating portion side contact portion 15 and are the heat radiating portion side contacts, which are portions close to the heat radiating plate 8 The formation of the

portions

19 and 20 is more preferable also from the viewpoint of heat radiation and also from the viewpoint of the installation strength of the member 12. Further, as in the present embodiment, heat sink

side contact portions

19 and 20 are located where the undulations of back cover 3 are formed by slopes, that is, back cover 3 and heat dissipation plate 8 are not close to each other and exhaust heat is generated. If it is formed under difficult points, to the first back cover side proximity part 14, the second back cover side proximity part 16, and the first back cover side proximity part 14, the second back cover side proximity part 16 It is preferable that it can be performed via the

In the present embodiment, the member 12 is a bracket for a wall hanging structure. However, the application of the member 12 is not limited to this. It may be simply intended to dissipate heat. The strength of the member 12 should be suitably selected in accordance with the application of the member 12. However, in the case where the member 12 is a metal fitting for a wall hanging structure as in this embodiment, it is desirable that the strength be strong.

The display device of the present invention can efficiently perform exhaust heat from a light source which is a heat source in the display panel, and therefore is useful as a display device having a structure in which the display is irradiated with an LED, a fluorescent tube or the like.

1 Display Unit 2 LCD Panel 3 Back Cover 4 Panel Module 5 LED
DESCRIPTION OF SYMBOLS 6 LED board 7 Reflector 8 Radiator 9 Printed circuit board 10

Screw

11, 13 Wall mounting screw hole 12 Member 14 1st back cover

side proximity part

15, 19 and 20 Heat sink side contact part 16 2nd back cover side proximity part 17 first leg 18 second leg

Claims

Light source,
A reflector that reflects light from the light source to the front side;
A heat sink which is in proximity to the light source and partially disposed at a predetermined position on the back side of the reflection plate;
A back cover which is adjacent to a predetermined surface of the heat sink opposite to the reflector in the part of the heat sink, and which entirely covers the reflector;
Display device.
A member is disposed between the back cover and the heat sink,
The member is
A radiator side contact portion which is a portion close to the radiator plate;
And a back cover side proximity portion which is a position close to the back cover
The display device according to claim 1.
The member is
A first back cover side proximity portion which is the back cover side proximity portion;
The radiator side contact portion;
A second back cover side proximity portion which is the back cover side proximity portion;
The display device according to claim 2, wherein are formed continuously.
The first back cover side proximity portion;
The radiator side contact portion;
The second back cover side proximity portion;
Connected by slopes,
The display device according to claim 3.
The member is
A first leg extending from the first back cover side proximity portion toward the heat sink and in proximity to the heat sink;
A second leg extending from the second back cover side proximity portion toward the heat sink and in proximity to the heat sink;
Having a substantially M-shaped cross section,
The display device according to claim 4.
The first leg and the second leg include:
The heat sink side contact part is extended to the opposite side, and a part close to the heat sink is formed.
The display device according to claim 5.
The reflector has a substantially arc-shaped cross section in the depth direction,
The light sources are arranged substantially linearly.
The part of the heat sink has a planar shape corresponding to a planar shape including the light source, and the part is disposed at a position corresponding to the deepest part of the reflector ,
The display device according to claim 1.
The reflection plate has one or more slits of a predetermined size,
The heat dissipating plate is disposed at a position facing the slit portion.
The display device according to claim 1.