JP2007140096A - Thin display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an effective cooling means for preventing that cooling effect is impeded because a position and an area of an air intake hole for cooling under a cabinet of the thin display apparatus is restricted, when a stand is attached under a thin display apparatus body. <P>SOLUTION: On an extended line of a middle part of a cross direction of the cabinet of the thin display apparatus, a stand support shaft with an internal hollow in which a top end section is opened to inside the thin display apparatus, and a bottom end section is opened to atmosphere, is adjacently provided. By taking air into the cabinet of the thin display apparatus from the bottom end of the stand support shaft having a large cross section area for taking outside air in order to cool inside of the thin display apparatus, and thereby, the cooling effect inside the thin display apparatus is improved by convection effect (chimney effect) caused by temperature difference between inside and outside of the cabinet. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to a thin display device such as a television or a display, which includes a thin display panel such as a liquid crystal display panel (LCD), a plasma display panel (PDP), and an electroluminescence panel (EL) as a display element. The present invention relates to a heat dissipation structure that efficiently dissipates heat generated from a printed wiring board on which a backlight for a liquid crystal display panel in the apparatus and other electronic circuit components are mounted to the atmosphere.

Heat generation sources from electronic circuits in thin display devices are generated intensively from electronic circuit components including power converter circuits, audio circuit output stage transistors, semiconductors such as semiconductor integrated circuits, resistors and transformers that handle high power. Many of these electronic circuit components are mounted on a printed wiring board. As a means for cooling the above-mentioned electronic circuit component serving as a large heat generation source, the electronic circuit component serving as a heat generation source is attached to a heat radiating plate having a large surface area made of aluminum material or copper material having high thermal conductivity, The heat generated from the electronic circuit component is exchanged with the air around the heat sink through the heat sink, thereby cooling the electronic circuit component and ensuring operational reliability.

In order to improve the cooling effect, for the purpose of increasing the contact area with the air on the surface of the plate-like heat sink, a heat-radiating fin is added to the surface of the plate-like heat sink as shown in Patent Document 1, or the plate-like heat sink is attached to the product cabinet. A method of exposing and setting outside is also widely applied. As disclosed in Patent Document 2, as a means for guiding heat generated inside the cabinet to an outer surface of the cabinet or a heat radiating plate installed outside the cabinet having a wide contact area with the atmosphere, a cooling liquid as a heat medium is put into the conduit. A technique using a filled water pipe has also been developed.
JP 2002-26200 A JP-A-3-144485

As described above, the heat generated from the electronic circuit components inside the thin display device is heat exchanged with the air inside the cabinet of the thin display device, but the temperature relationship between the air inside the cabinet and the electronic circuit components is in thermal equilibrium. If it reaches, unless the air inside the cabinet of the thin display device is discharged outside the cabinet, the purpose of cooling the electronic circuit components cannot be achieved continuously.

For this reason, as shown in the external perspective view of the back and bottom of the liquid crystal television shown in FIG. 7, the air heated inside the cabinet has a smaller specific gravity and utilizes the convection phenomenon that moves to the upper part. 3b is provided to discharge the warmed air inside the cabinet to the outside of the cabinet, and to provide a suction hole 3a for sucking outside air having a relatively low temperature in the lower part of the rear cabinet 3, thereby The heat generated in the is efficiently released to the outside air.

However, in the liquid crystal television according to the present invention, as shown in FIG. 7, a stand 24 for using the liquid crystal television as a desktop type or a floor-standing type is attached to the display unit body of the liquid crystal television. In some cases, the position and area of the air intake holes 3a disposed in the lower portion of the rear cabinet 3 are limited, and it may be difficult to achieve a required cooling effect.

In a thin display device in which a thin display panel such as a liquid crystal display panel or a plasma display panel is configured as a display element, a stand is attached to the lower portion of the thin display device body in order to use the thin display device as a desktop type or a floor-standing type. For this reason, the position and area of the air intake holes provided in the lower part of the cabinet of the thin display device are limited, and it may be difficult to achieve a required cooling effect. A means for realizing the above is provided.

In a thin display device having a display panel in the front part of the cabinet and an electronic circuit part in the rear part of the cabinet, a stand is provided at substantially the lower center of the thin display device, and the stand column constituting the stand is hollow inside The upper end portion is open to the inside of the thin display device, and the lower end portion is open to the atmosphere.

The width of the internal hollow stand column in the longitudinal direction of the cross section is made to coincide with the width direction of the cabinet of the thin display device to increase the area of the cross section of the intake passage and to uniformly cool the heat generating components distributed in the cabinet. .

An air intake hole is formed in the side surface of the internal hollow stand column, and the cooling effect is improved by increasing the outside air intake amount from the air intake hole.

An intake fan is attached to the inside hollow stand column, and the cooling effect is improved by forcibly increasing the amount of outside air intake and the wind speed.

An air intake hole is formed in a decorative cover that covers the fastening portion between the cabinet and the stand column of the thin display device, and the cooling effect is improved by increasing the amount of outside air sucked from the air intake hole.

When the thin display device is suspended on a wall and used as a wall-hanging type, the stand for using the thin display device as a desktop type or a floor-standing type is unnecessary and is removed and attached to the stand. The front and back of the decorative cover having the protruding portion toward the outside of the cabinet for covering the fastening portion of the cabinet and the stand column used at times are reversed so that the cabinet can be attached to the cabinet.

Perforated from the lower end of a stand column having a large cross-sectional area for inhaling outside air for cooling the inside of the thin display device, or on the side of the decorative cover that covers the fastening portion of the stand column and the cabinet or the inside hollow stand column Outside air having a relatively low temperature flows from the intake hole into the cabinet of the thin display device, and exhibits a cooling effect inside the thin device due to a convection effect (chimney effect) due to a temperature difference between the inside and outside of the cabinet. By reducing the operating temperature of each part constituting the thin display device, it contributes to improving long-term operation reliability and maintaining desired performance.

Hereinafter, a case where an embodiment of the present invention is applied to a liquid crystal television will be described with reference to the drawings. FIG. 1 is an external front view of a liquid crystal television. In FIG. 1, 1 is a liquid crystal display panel for image display, 2 is a front cabinet, 4 is composed of a stand column 4b and a stand base 4a attached to the liquid crystal display unit body when the liquid crystal television is used as a desktop type. It is a stand. A cushion material 4c is provided on the bottom surface of the stand base 4a.

Next, the configuration of the optical system inside the liquid crystal television according to the present invention will be described with reference to FIG. On the back surface of the liquid crystal display panel 1, an optical sheet set 11 in which a reflective sheet, a polarizing sheet and a prism sheet are combined is disposed. A backlight unit 15 is disposed behind them, and light is irradiated from the back of the optical sheet set 11 and the liquid crystal display panel 1. A large number of arc tubes 13 and light diffusion plates 12 are incorporated in the backlight chassis 14 constituting the backlight unit 15. A printed wiring board (not shown) on which electronic circuit components are mounted is disposed on the back surface of the backlight chassis 14.

As shown in FIG. 7 as a conventional example in which the liquid crystal television is used as a desktop type, when the stand 24 is attached to the main body of the liquid crystal television, the air intake holes 3a provided in the lower part of the rear cabinet 3 of the liquid crystal television are used. Is limited by the stand 24, and it may be difficult to achieve a required cooling effect.

FIG. 3 is a view for explaining the first and second embodiments of the present invention, and is a longitudinal sectional view of a liquid crystal television cut along a cutting line indicated by a chain line AA in FIG. A first embodiment of the present invention will be described. The heated air from the printed wiring board 7 on which the backlight unit 15 and other electronic circuit components arranged in the cabinet shown in FIG. 3 are mounted becomes lighter, and the upper part of the rear cabinet 3 shown in FIG. Is discharged to the outside air through the exhaust hole 3b.

As shown by a broken line arrow in FIG. 3 as the first embodiment of the present invention, the outside air having the same volume as the air discharged and heated in the cabinet of the liquid crystal television is mainly the inside of the liquid crystal television. The air is sucked from the lower end of the stand column 4b which is disposed inside the printed wiring board 7 on which the electronic circuit component which is a heat generating part is mounted and is open at both upper and lower ends, and passes through the upper end of the stand column 4b. It is taken into the inside of the cabinet of the liquid crystal television and discharged out of the cabinet through an exhaust hole 3b drilled in the upper part of the rear cabinet 3. Convection between the temperature inside the cabinet and the outside air is continued indefinitely to achieve thermal equilibrium, and the inside of the cabinet is effectively cooled by circulating the air heated inside the cabinet and the cool outside air.

  A cushion material 4c is attached to the bottom surface of the stand base 4a, and a gap is formed between the bottom surface of the stand base 4a and the installation table 6 as shown in FIG. Inhalation is performed, but when a large amount of outside air is inhaled to improve the wind speed and air volume, as shown in FIG. 3 as the second embodiment of the present invention, the intake fan 8 is placed in the hollow internal stand column 4b. Can also be incorporated. Since the intake fan 8 is mounted inside the stand column 4b, it is advantageous in that wind noise does not reach the viewer directly and noise from the intake fan 8 can be suppressed.

FIG. 4 is an external perspective view showing a back surface, a bottom surface, and a stand portion of a liquid crystal television for explaining a third embodiment of the present invention. In order to attach the stand 4 to the lower part of the rear cabinet 3 of the display unit main body, the air intake holes 3a cannot be provided in a part of the bottom surface of the rear cabinet 3, and the amount of cool outside air taken into the cabinet is insufficient. In order to improve this, a stand column intake hole 4e is formed in the side surface of the stand column 4b, and a stand base intake hole 4d is formed in a portion corresponding to the position of the stand column 4b on the bottom surface of the stand base 4a.

FIG. 5 is an external perspective view showing a back surface, a bottom surface, and a stand portion of a liquid crystal television for explaining a fourth embodiment of the present invention. The air intake hole 3a cannot be provided in a part of the lower back of the back cabinet 3 which is a mounting portion of the decorative cover 5 that covers the fastening portion between the lower part of the rear cabinet 3 and the stand 4 of the display unit body. The amount of cool outside air taken in is insufficient. In order to improve this, an intake hole is formed in the back surface of the decorative cover 5.

FIG. 6 is an external perspective view showing a back surface, a bottom surface, and a stand portion of a liquid crystal television for explaining a fifth embodiment of the present invention. In some cases, the liquid crystal television is suspended from a wall surface due to its thin and lightweight features. The stand is not necessary and is removed when the wall surface is installed, but the decorative cover 5 covering the fastening portion between the stand and the liquid crystal television main body should be removed to prevent entry of dust and foreign matter into the liquid crystal television and electric shock prevention. I can't.

However, since the decorative cover 5 has a protrusion protruding rearward from the rear surface of the rear cabinet 3, the decorative cover 5 comes into contact with or approaches the wall surface, and sufficient outside air suction is inhibited. Therefore, as shown in FIG. 6 as a fifth embodiment of the present invention, the front and back surfaces of the decorative cover 5 are reversed and attached to the rear cabinet 3, whereby the air intake holes drilled in the decorative cover 5 are closed by the wall surface. Without sucking cool outside air into the cabinet of the liquid crystal television, a desired internal cooling effect can be exhibited.

It is an external appearance front view of the desk type liquid crystal television concerning the present invention. It is a disassembled perspective view for demonstrating the structure of the optical system inside a liquid crystal television. FIG. 2 is a longitudinal sectional view of a liquid crystal television cut along a chain line AA in FIG. 1 for explaining the first and second embodiments of the present invention. It is a perspective view which shows the back surface, bottom face, and stand part of the liquid crystal television for demonstrating the 3rd Example of this invention. It is a perspective view which shows the back surface, bottom face, and stand part of the liquid crystal television for demonstrating the 4th Example of this invention. FIG. 6A is a perspective view showing a back surface, a bottom surface, and a decorative cover portion of a liquid crystal television for explaining a fifth embodiment of the present invention, and FIG. 6B is an enlarged view of the decorative cover portion. It is an external appearance perspective view of the back surface, bottom surface, and stand attachment part of the prior art example of a liquid crystal television.

Explanation of symbols

1: LCD panel 2: Front cabinet 3: Rear cabinet 3a: Intake hole 3b: Exhaust hole 4: Stand
4a: Stand base 4b: Stand column 4c: Cushion material 4d: Stand base intake hole 4e: Stand column intake hole 5: Cosmetic cover 6: Installation table 7: Printed wiring board 8: Intake fan 11: Optical sheet set 12: Light Diffuser 13: arc tube 14: backlight chassis 15: backlight unit
24: Stand 24a: Stand base 24b: Stand support 25: Cosmetic cover

Claims (6)

In a thin display device having a display panel in the front part of the cabinet and an electronic circuit part in the rear part of the cabinet, a stand is provided at substantially the lower center of the thin display device, and the stand column constituting the stand is hollow inside The thin display device is characterized in that the upper end portion is open to the inside of the thin display device and the lower end portion is open to the atmosphere. 2. The thin display device according to claim 1, wherein the longitudinal direction of the cross section of the hollow internal stand column is made to coincide with the width direction of the thin display device. 3. The thin display device according to claim 1, wherein an air intake hole is formed in a side surface of the hollow internal stand column. 4. A thin display device according to claim 1, wherein an intake fan is attached to the inside of a hollow stand column. 5. The thin display device according to claim 1, further comprising a decorative cover that covers a fastening portion between the cabinet and the stand column of the thin display device, and an air intake hole is formed in the decorative cover. A thin display device.   6. The thin display device according to claim 5, wherein when the stand is removed, the decorative cover can be attached to the cabinet by reversing the front and back.

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