JP2005196000A - Thin image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat dissipation structure having a large contact area with the atmosphere and a high heat dissipation effect by a chimney effect in a heat dissipation plate for cooling electronic circuit components of a thin image display device.
SOLUTION: A hollow structural member made of a metal material having high thermal conductivity is vertically penetrated through a product casing at an intermediate portion in the front-rear direction of the thin image display device, and the outer periphery of the hollow structural member is inside the casing. An electronic circuit component having a large calorific value is attached to the surface, an air flow path is provided in the hollow portion of the hollow structural member, and air convection in the hollow portion of the hollow structural member is promoted by the chimney effect achieved by the hollow space. In order to improve the heat dissipating effect, the structure can ensure a wide area in contact with the atmosphere.
[Selection] Figure 3

Description

The present invention relates to a thin image display device in which a thin image display panel including a liquid crystal image display panel, a plasma image display panel, and an EL image display panel is configured as an image display element, and more specifically, an image display panel in the thin image display device, This technology relates to a heat dissipation structure that efficiently dissipates heat generated from electronic circuit components to the atmosphere.

In an image display device, heat generated from an electronic circuit is generated intensively from electronic circuit components having a large electric / thermal conversion power, including semiconductors such as output stage transistors and integrated circuits, resistors, and transformers. As a means for cooling the above-mentioned electronic circuit component which is a large heat generation source, the electronic circuit component which is a heat generation source is attached to a flat plate heat sink made of an aluminum material having high thermal conductivity, and the flat plate heat sink is interposed therebetween. Cooling of electronic circuit parts is realized.

For the purpose of improving the cooling effect, the surface of the flat heat sink is provided with heat dissipating fins as shown in JP-A-2002-26200 for the purpose of increasing the contact area with the atmosphere, or the flat heat sink is placed outside the product housing. The method of setting it to be exposed to is also widely applied. As a means for guiding the heat generated inside the casing to the outer surface of the casing itself or to a heat radiating plate installed outside the casing and having a large contact area with the atmosphere, as disclosed in JP-A-3-144485, A technique using a water pipe filled with a certain coolant in a conduit has also been developed.

JP 2002-26200 A JP-A-3-144485

In order to dissipate a large amount of heat generated from the electronic circuit components in the image display device into the atmosphere by the heat sink structure, a large heat sink is applied, or a heat sink surface of a limited area, In order to bring the heat sink into contact with the air over a wider area, a device that adds a large number of bowl-shaped heat sink fins to the surface of the heat sink has also been applied, but this increases the size of the product housing, which limits the size of the heat sink. There was a problem. In view of such a situation, a heat dissipation structure having a large heat dissipation effect to the atmosphere is provided.

In order to solve the above-described problems, the present invention provides a thin image display device having an image display panel at a front portion of a housing and an electronic circuit component at a rear portion of the housing. In a thin image display device having a hollow structure member vertically provided with a heat radiating fin in a vertical direction, specifically, an image display panel at the front of the housing and an electronic circuit component at the rear of the housing, Between the image display panel and the circuit component, a metal hollow structure member having a horizontally long cross section and a plurality of heat radiation fins formed in an axial direction in an inner hollow portion is disposed.

In the present invention, a stand base fastening screw hole may be formed in a part of the radiation fin of the hollow structural member to fasten the stand base. Moreover, it is also possible to attach a fan to the upper end or the lower end of the hollow structural member. Furthermore, the width in the longitudinal direction of the cross section of the hollow structural member can be made substantially the same as the lateral width of the casing. The image display panel and the electronic circuit component can be attached to the outer peripheral surface of the hollow structural member. In addition, it is preferable to use the hollow structure member which extruded and formed the aluminum material as said hollow structure member. It is also possible to attach a large structural part exceeding the width of the hollow structural member, and / or an electronic circuit component arranged away from the hollow structural member to the heat conducting plate, and to bring the heat conducting plate into close contact with the hollow structural member It is.

As described above, the present invention achieves the following effects by vertically penetrating the hollow structural member having the heat radiation fin in the inner hollow portion in the middle portion in the front-rear direction of the casing of the thin image display device. It is done.

(1) As a heat dissipation device, the hollow structural member is arranged so as to penetrate vertically through the housing, so that the entire inner peripheral surface of the hollow structural member can be brought into wide contact with the atmosphere and the temperature rises. The air in the hollow portion of the hollow structural member moved to the upper end of the hollow structural member, and air at a relatively low temperature flows from the lower end of the hollow structural member, and exhibits a convection effect (chimney effect) due to the temperature difference. By reducing the operating temperature of each part constituting the image display device, it contributes to the improvement of long-term operation reliability and the achievement and maintenance of desired performance over a long period of time.

(2)
Since the cross-sectional shape of the hollow structural member is horizontally long, the front and back surfaces of the hollow structural member can form a wide area plane. Therefore, the front part of the hollow structural member can be brought into close contact with an image display panel with a large amount of heat generation, and the rear surface part of the hollow structural member can be brought into close contact with an electronic circuit component over a wide area, thereby enabling efficient heat exchange operation. Become. By making the longitudinal dimension of the cross-section of the hollow structural member the same as the lateral width of the housing, the heat radiation area can be further increased.

(3)
In the product form of the design having a support for supporting the image display device and the stand base, by configuring the support with the hollow structural member without separately preparing dedicated parts for heat dissipation, It can also be used as a heat dissipation device, and a heat dissipation device can be realized economically. Moreover, as a heat dissipation device, a large heat dissipation effect can be exhibited by obtaining a contact surface with the atmosphere in a sufficiently large area.

(4) A large number of heat dissipating fins extending from the upper end to the lower end are arranged on the inner peripheral portion of the hollow structural member formed by extruding the aluminum material, and by forming a cross section of some of the fins in a C shape A portion having a C-shaped cross section can be used as a screw fitting hole for fastening the stand base to the support column.

(5) It is structurally possible to dispose air intake and / or exhaust fans at the upper end and lower end of the hollow structural member, and forcibly inhale and exhaust air in the inner periphery of the hollow structural member. As a result, the cooling effect can be further enhanced. In particular, when it is disposed at the lower end of the hollow structural member, the fan motor is covered with the stand base, so that it is possible to reduce the noise reaching the viewer without obstructing air inhalation.

(6) Since the hollow portion of the hollow structural member is electrically isolated from the electronic circuit components inside the image display device, the electrical circuit is insulated by accidental overflow from the outside of the housing into the hollow portion of the hollow structural member. There is no fear of inducing a defective accident or degrading the optical performance due to the intrusion of dust into the image display device.

(7) Since the cooling method is an air cooling method, unlike the water cooling method in which a liquid heat conduction medium for cooling is applied inside the casing, an electrical circuit insulation failure accident due to water leakage from the water pipe due to deterioration over time is induced. There is no concern.

An embodiment of a heat dissipation structure of a thin image display device according to the present invention will be described below with reference to FIGS. As a first embodiment of the present invention, a perspective view of a desktop thin image display device is shown in FIG. As shown in the figure, the thin image display device is composed of a front housing 11 and a rear housing 12, and the hollow structural member 1 is attached vertically through the rear housing 12. The hollow structural member 1 is rectangular in cross section and formed hollow inside, and a plurality of radiating fins are formed in the longitudinal direction on the inner wall portion of the hollow portion. The lower end portion 4 and the upper end portion 5 of the hollow structural member 1 are open to the atmosphere to freely enter and exit by convection of internal air.

Here, when the thin image display device shown in FIG. 1 is powered on and turned on, each part generates heat, which is conducted to the hollow structure member 1, and the air in the hollow part of the hollow structure member 1. The temperature rises and the air is discharged from the upper end of the hollow structural member 1 into the atmosphere, and air having the same volume as the discharged air is taken into the hollow structural member 1 from the lower end of the hollow structural member 1 and thereafter convection. Is continued, and the heat generated by the thin image display device is efficiently discharged.

Next, a stationary type thin image display apparatus having a stand base will be described as a second embodiment of the present invention. FIG. 2 is a perspective view of a stationary thin type image display device having a stand base 2, and FIG. 3 is a longitudinal sectional view schematically showing the internal structure of FIG. As shown in the figure, the display device main body is composed of a front housing 11 and a rear housing 12, and a hollow structure column 3 is attached vertically through the rear housing 12. The hollow structure column 3 is rectangular in cross section and formed hollow inside, and a plurality of radiating fins are formed in the longitudinal direction on the inner wall portion of the hollow portion. A lower end of the hollow structure support 3 is attached to the stand base 2 through the stand base 2. The lower end portion 4 and the upper end portion 5 of the hollow structure column 3 are opened to the atmosphere to freely enter and exit by convection of internal air.

An electronic circuit component 8 having a large calorific value is attached to the rear surface 6 of the hollow structure column 3, and an image display panel 10 is attached to the front surface of the hollow structure column 3. Further, when the image display panel 10 is of a liquid crystal type, a backlight having a large amount of generated heat and an electronic circuit for driving the backlight are attached to the front and back surfaces of the hollow structure support 3. In the case of the plasma display panel type, the panel itself having a large calorific value and the panel driving electronic circuit are attached to the front and back surfaces of the hollow structure column 3.

In particular, in the case of the liquid crystal type, the image display panel 10 having a large calorific value is attached to the front surface of the hollow structure column 3, and the electronic circuit component 8 is attached to the rear surface. At this time, the width in the longitudinal direction of the cross section of the hollow structure support 3 is made substantially the same as the lateral width of the front case 11 and the rear case 12, so that the outer peripheral surface 6 of the hollow structure support 3 and the image display panel 10 that is a heat generation source. In addition, the electronic circuit component 8 can be brought into contact with a wide area, and at the same time, the inner peripheral surface 7 can be brought into contact with the atmosphere over a wide area, so that a high heat dissipation effect can be exhibited.

When the thin image display device shown in FIG. 2 and FIG. 3 is powered on and turned on, each part generates heat, which is conducted to the hollow structure column 3 and the air in the hollow part of the hollow structure column 3 The temperature rises and is discharged into the atmosphere from the upper end portion 5 of the hollow structure column 3 as indicated by an arrow A, and air having the same volume as the discharged air is discharged from the lower end portion 4 of the hollow structure column 3 to the arrow B. As shown, it is taken into the hollow structure column 3. Here, since the inner space of the hollow structure column 3 is partitioned by the heat radiating fins, the chimney effect is exhibited and the ascending air current is accelerated. In this way, the air in the hollow portion of the hollow structure support 3 is in convection indefinitely in order to achieve thermal equilibrium, and the image display panel 10 attached to the outer peripheral surface 6 via the hollow structure support 3 and the electronic circuit The cooling effect of the part 8 is demonstrated.

Further, in order to enhance the heat dissipation effect, the fan 13 may be attached to the lower end portion 4 of the hollow structure column 3 for forced intake as shown in FIG. 3 for the purpose of increasing the air flow rate in the hollow portion of the hollow structure column 3. Is possible. Further, for forced exhaust, although not shown, a fan can be attached to the upper end portion 5 of the hollow structure column 3.

FIG. 4 is a cross-sectional view showing the internal structure of the hollow structural member 1 and the hollow structural support 3 used in the above-described embodiment. The hollow structural member 1 and the hollow structural support column 3 are continuously processed as long objects by extrusion molding of an aluminum material having excellent heat conduction characteristics, and are used after being cut to a required length. A large number of heat dissipating fins 9 are formed on the inner peripheral surface 7 of the hollow structural member 1 and the hollow structural support column 3 to enhance the effect of heat dissipation to the atmosphere. A part of the radiating fin 9 is formed with a radiating fin 14 having a C-shaped cross section, and is used as a fitting hole for a fastening screw between the hollow structure column 3 also serving as a column and the stand base 2. Furthermore, it can also be used for attaching fastening screws such as a fan 13 for intake air. As described above, in the image display device of the present invention, large-sized electronic circuit components such as power transistors and power transformers that generate heat in a concentrated manner are directly attached to the hollow structural member 1 and the hollow structural support 3 and cooled. The objective can be achieved.

Next, as Example 3 of the present invention, FIG. 5 shows a case where a large-sized structural component having a dimension exceeding the width of the hollow structural member 1 or an electronic circuit component arranged away from the hollow structural member 1 is cooled. FIG. 5 is a cross-sectional view showing a component mounting structure to the hollow structural member 1, and a backlight unit 15 of a liquid crystal image display panel exceeding the lateral width of the hollow structural member 1 is attached to one side. On the opposite side, a printed wiring board 16 disposed away from the hollow structural member 1 is temporarily attached to a heat conducting plate 17 made of an aluminum material having a high thermal conductivity, and further the heat conducting plate 17 is wide on the hollow structural member 1. Close by area. As a result, the printed wiring board 16 arranged away from the backlight unit 15 and the hollow structural member 1 of the liquid crystal image display panel is efficiently cooled via the heat conducting plate 17.

As an application example of the present invention, it can be applied to a thin image display device in which a thin image display panel including a liquid crystal image display panel, a plasma image display panel, and an EL image display panel is configured as a display element.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a desktop thin image display device according to a first embodiment. 6 is a perspective view of a stationary thin image display apparatus according to Embodiment 2. FIG. 6 is a longitudinal sectional view of a stationary thin image display apparatus according to Embodiment 2. FIG. It is a cross-sectional view of the hollow structure member and hollow structure support | pillar used by this invention. 6 is a cross sectional view showing Example 3. FIG.

Explanation of symbols

1: Hollow structure member 2: Stand base 3: Hollow structure support column 4: Lower end portion 5 of hollow structure member: Upper end portion 6 of hollow structure member: Outer peripheral surface 7 of hollow structure member 7: Inner peripheral surface 8 of hollow structure member Circuit component 9: Radiation fin 10 provided on the inner peripheral surface of the hollow structural member 10: Image display panel 11: Front casing 12: Rear casing 13: Fan 14: Radiation fin 15 having a C-shaped cross section: Liquid crystal image display Panel backlight unit 16: printed wiring board 17: heat conducting plate

Claims (11)

In a thin image display device having an image display panel in the front part of the housing and an electronic circuit part in the rear part of the housing, a hollow structure member is penetrated in the vertical direction of the thin image display device in the middle part in the front-rear direction of the housing. A thin image display device characterized by being provided. In a thin image display device having an image display panel in the front part of the housing and an electronic circuit part in the rear part of the housing, a horizontal hollow metal cross section is provided between the image display panel and the electronic circuit part. A thin image display device comprising a structural member. 3. The thin image display device according to claim 1, wherein a heat radiation fin is provided in a hollow portion of the hollow structural member. 4. The thin image display apparatus according to claim 1, wherein a stand base is fastened to a lower end of a support column made of the hollow structural member. 5. The thin image display device according to claim 4, wherein a screw hole having a C-shaped cross section for fastening a stand base is formed in a part of the radiation fin of the hollow structural member. 6. The thin image display device according to claim 1, wherein an intake air and / or an exhaust fan is attached to a hollow portion of the hollow structural member. 6. The thin image display device according to claim 1, wherein an intake or / and an exhaust fan is attached to an upper end and / or a lower end of the hollow structural member. 8. The thin image display device according to claim 1, wherein a width of the hollow structural member in a longitudinal direction of the cross section is substantially the same as a lateral width of the casing. 9. The thin image display device according to claim 1, wherein the image display panel and / or the electronic circuit unit are attached to an outer peripheral surface of the hollow structure member. 10. A thin image display device according to claim 1, wherein a hollow structure member obtained by extruding an aluminum material is used as the hollow structure member. The thin image display device according to any one of claims 1 to 10, wherein a large-sized structural component exceeding a lateral width of the hollow structural member and / or an electronic circuit component disposed away from the hollow structural member is attached to the heat conducting plate. A thin image display device, wherein the heat conducting plate is brought into close contact with the hollow structural member.

Images