JP2005017413A - Flat display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently cool a heat generation part of a flat display device without causing noise. <P>SOLUTION: In the flat display device having a display panel which generates heat, coolant tubes 4 are arranged in a display panel part at proper intervals, a coolant tank 13 is connected to both ends of the coolant tubes 4 through a passage 15, and a coolant circulating pump 14 is connected on the way of the passage 15 connecting the coolant tubes 4 and the coolant tank 13 or between the coolant tank 13 and the passage 15 to circulate the coolant in the coolant tubes 4, and thus the display panel is cooled. In the case that the display panel has a backlight comprising a reflector 2 and fluorescent tubes 3, the coolant tubes 4 are arranged on the front surface and/or the rear surface of the reflector 2 along the fluorescent tubes 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cooling structure for a thin display device including a display unit that generates heat, such as a liquid crystal panel having a backlight and a PDP.
[0002]
[Prior art]
In recent years, displays thinner than conventional CRTs have come to be used using monitors such as liquid crystal panels and PDPs as monitors for televisions and personal computers. A thin display device having a display unit that generates heat, such as a liquid crystal panel having a backlight and a PDP, has a larger amount of heat generation as it becomes larger, and a fan may be provided to discharge the generated heat. When a fan is installed and forced ventilation is performed, a sufficient exhaust heat effect can be obtained, but noise due to wind noise is generated, and new noise countermeasures are required. Therefore, as a heat exhausting method that does not generate noise, a technique of exhausting heat using cooling water or refrigerant liquid has been proposed (Patent Document 1 and Patent Document 2). Patent Document 1 discloses a technique for cooling a heat generating portion of a liquid crystal display device with cooling water. In Patent Document 2, a heat receiving head filled with a cooling liquid is attached to the back of a CPU of a desktop computer, and a heat radiating tube is provided immediately above the heat receiving head, so that the heat generated by the CPU is received in the heat receiving head. This is absorbed by the refrigerant liquid and discharged to the outside air at the portion of the heat radiating tube.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 03-50478 [Patent Document 2]
Japanese Patent Laid-Open No. 2002-182796 [0004]
[Problems to be solved by the invention]
However, although the former liquid crystal display device of Patent Document 1 can efficiently cool the backlight portion, the cooling water used for cooling is supplied from a separate cooling water generator and used for cooling. The cooled water is discharged as it is. Therefore, it cannot be applied as it is to a cooling device for a thin display device that is not supposed to be used in a place equipped with a water source or a drainage facility.
Further, since the latter computer of Patent Document 2 has a structure in which the heat generated only by the CPU is radiated on the back surface of the liquid crystal panel, the heat generated in the liquid crystal panel itself cannot be discharged using the refrigerant liquid. It was.
Therefore, an object of the present invention is to propose a thin display device that can be efficiently cooled by a coolant that circulates in a backlight portion of a liquid crystal panel and a heat generating portion such as a PDP.
[0005]
[Means for Solving the Problems]
In order to solve the above-described problems, the thin display device of the present invention is configured such that a cooling liquid tube filled with a cooling liquid is disposed in a display panel portion that generates heat so as to absorb and / or diffuse the heat generation of the display panel. In detail, in a thin display device having a display panel that generates heat, a cooling liquid tube disposed at an appropriate interval in the display panel portion, and a cooling liquid connected to both ends of the cooling liquid tube via liquid paths A tank, and a coolant circulation pump provided in the middle of a fluid path connecting the coolant tube and the coolant tank or between the coolant tank and the fluid path are provided. When the display panel has a backlight composed of a reflector and a fluorescent tube, the cooling liquid tube is arranged on the front surface and / or the back surface of the reflector along the fluorescent tube. When the cooling liquid tube is disposed on the surface of the reflecting plate, a reflective paint having substantially the same reflectance as that of the reflecting plate is applied to the surface of the cooling liquid tube. Further, when the thin display device main body has a speaker, the coolant tank is disposed in the vicinity of the speaker. In addition, when the lower part of the thin display device body is supported by a stand, the coolant tank is disposed in the stand. Here, when the stand has a hollow structure, a plurality of ventilation holes are formed in the surface portion of the stand. It is also possible to dissipate the coolant by disposing the liquid path on the surface portion of the stand. Furthermore, it is preferable to dispose a hygroscopic dehumidifying agent below the cooling liquid tube, the cooling liquid tank, the liquid path, or the cooling liquid circulation pump. It is also possible to use water as the coolant.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view showing a first embodiment in which the present invention is applied to a thin display device having a liquid crystal panel such as a liquid crystal television.
In the figure, reference numeral 1 denotes a liquid crystal panel, a reflector 2 is disposed on the back surface thereof, and fluorescent tubes 3 serving as light sources are disposed in front of the liquid crystal panel at equal intervals in the horizontal direction. A cooling liquid tube 4 is arranged in parallel with the fluorescent tube 3 on the substantially upper surface portion of the reflector 2 obliquely above and behind the fluorescent tube 3. On the surface of the cooling liquid tube 4, a reflective paint having substantially the same reflectance as that of the reflector 2 is applied. The coolant tube 4 is filled with a coolant such as water and absorbs heat generated by the fluorescent tube 3 and the like. A substrate 5 is attached to the back surface of the reflecting plate 2 and a drive circuit for the liquid crystal panel 1 is formed. A moisture absorbing and dehumidifying agent 6 is disposed below the lowermost stage of the cooling liquid tube 4 and absorbs it when condensation occurs on the surface of the cooling liquid tube 4 and drops are dropped.
[0007]
These parts are housed between the front casing 7 and the rear casing 8, and the lower casing 9 is suspended from the lower ends of the front casing 7 and the rear casing 8, and the speaker 10 is disposed on the front section. Yes. The rear housing 8 is supported by a stand 11 attached integrally. The base portion 12 of the stand 11 has a hollow structure, and a cooling liquid tank 13 for storing the cooling liquid therein and a pump 14 for sending the cooling liquid to the cooling liquid tube 4 and circulating it are installed. The coolant tank 13 and the pump 14 are connected to both ends of the coolant tube 4 through the upper portion of the stand 11 by a liquid passage 15 (not shown) from the middle. While the fluorescent tube 3 is lit, the pump 14 is turned on. By operating and circulating the coolant through the coolant tube 4 and the coolant tank 13, the heat generated by the fluorescent tube 3 and the like is absorbed, and the liquid crystal panel 1 and the substrate 5 are kept at a predetermined temperature or lower. The feature of the first embodiment is that the center of the thin display device is lowered and the stability is improved by providing the coolant tank 13 below the stand 11.
[0008]
FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.
In the figure, reference numeral 1 denotes a liquid crystal panel, a reflector 2 is disposed on the back surface thereof, and fluorescent tubes 3 serving as light sources are disposed in front of the liquid crystal panel at equal intervals in the horizontal direction. A cooling liquid tube 4 is arranged in parallel with the fluorescent tube 3 on the substantially upper surface portion of the reflector 2 obliquely above and behind the fluorescent tube 3. On the surface of the cooling liquid tube 4, a reflective paint having substantially the same reflectance as that of the reflector 2 is applied. The coolant tube 4 is filled with a coolant such as water and absorbs heat generated by the fluorescent tube 3 and the like. A substrate 5 is attached to the back surface of the reflecting plate 2 and a drive circuit for the liquid crystal panel 1 is formed. A moisture absorbing and dehumidifying agent 6 is disposed below the lowermost stage of the cooling liquid tube 4 and absorbs it when condensation occurs on the surface of the cooling liquid tube 4 and drops are dropped.
[0009]
These parts are housed between the front casing 7 and the rear casing 8, and the lower casing 9 is suspended from the lower ends of the front casing 7 and the rear casing 8, and the speaker 10 is disposed on the front section. Yes. In the vicinity of the speaker 10, a coolant tank 13 for storing coolant is installed. The rear housing 8 is supported by a stand 11 attached integrally. The base portion 12 of the stand 11 has a hollow structure, and a pump 14 that circulates the coolant is installed therein. The coolant tank 13 and the pump 14 are connected to both ends of the coolant tube 4 by a liquid path 15 (not shown) from the middle, and the pump 14 is operated to cool the coolant while the fluorescent tube 3 is lit. By circulating through the liquid tube 4 and the cooling liquid tank 13, heat generated by the fluorescent tube 3 and the like is absorbed, and the liquid crystal panel 1 and the substrate 5 are held at a predetermined temperature or lower. The feature of this second embodiment is that the chatter noise is suppressed by arranging the coolant tank 13 close to the speaker 10.
[0010]
FIG. 3 is a longitudinal sectional view showing a third embodiment of the present invention.
In the figure, reference numeral 1 denotes a liquid crystal panel, a reflector 2 is disposed on the back surface thereof, and fluorescent tubes 3 serving as light sources are disposed in front of the liquid crystal panel at equal intervals in the horizontal direction. A cooling liquid tube 4 is arranged in parallel with the fluorescent tube 3 on the substantially upper surface portion of the reflector 2 obliquely above and behind the fluorescent tube 3. On the surface of the cooling liquid tube 4, a reflective paint having substantially the same reflectance as that of the reflector 2 is applied. The coolant tube 4 is filled with a coolant such as water and absorbs heat generated by the fluorescent tube 3 and the like. A substrate 5 is attached to the back surface of the reflecting plate 2 and a drive circuit for the liquid crystal panel 1 is formed. A moisture absorbing and dehumidifying agent 6 is disposed below the lowermost stage of the cooling liquid tube 4 and absorbs it when condensation occurs on the surface of the cooling liquid tube 4 and drops are dropped.
[0011]
These parts are housed between the front casing 7 and the rear casing 8, and the lower casing 9 is suspended from the lower ends of the front casing 7 and the rear casing 8, and the speaker 10 is disposed on the front section. Yes. The rear housing 8 is supported by a stand 11 attached integrally. A ventilation through hole 17 is formed on the upper surface of the base portion 12 of the stand 11, and a heat radiating pipe line 18 is disposed below the ventilation hole 17. The pipe 18 and the cooling liquid tube 4 are connected by a liquid path (not shown) in the stand 11, and a cooling liquid tank and a pump are disposed in the middle. With these configurations, while the fluorescent tube 3 is lit, the pump operates and the coolant circulates through the coolant tube 4, the coolant tank, and the heat radiation pipe 18, thereby generating heat from the fluorescent tube 3 and the like. The liquid crystal panel 1 and the substrate 5 are kept at a predetermined temperature or less. The feature of the third embodiment is that the ventilation hole 17 is formed in the upper surface of the base portion 12 of the stand 11 to increase the heat radiation amount from the internal pipe line 18 so that the cooling liquid is efficiently used. It was to cool down automatically.
[0012]
In each of the above-described embodiments, the hygroscopic dehumidifying agent 6 is disposed below the cooling liquid tube 4. However, the hygroscopic dehumidifying agent 6 is disposed below the cooling liquid tank 13, the pump 14, the liquid path 15, and the pipe line 18. It may be arranged. Moreover, although each above-mentioned embodiment has arrange | positioned the coolant tube 4 to the surface side of the reflecting plate 2, it can also arrange | position to the back surface side of the reflecting plate 2, or can arrange | position to both front and back surfaces. Further, a liquid path 15 connecting the coolant tube 4, the coolant tank 13, and the pump 14 can be disposed on the surface of the stand 11, and the heat radiation of the coolant can be measured at that portion.
[0013]
4 and 5 are diagrams showing another example of the mutual positional relationship between the coolant tube 4 and the fluorescent tube 3 in each of the above-described embodiments, FIG. 4 is a front view thereof, and FIG. 5 is a perspective view thereof. is there. The illustrated example shows a case where the fluorescent tube 3 is a straight tube, and the coolant tube 4 reciprocates close to the top and bottom of the linear portion of each fluorescent tube 3 and is connected to the liquid channel after they are connected up and down in order. 15, a coolant circulation path is formed and connected to the coolant tank 13 and the pump 14.
[0014]
Similarly, FIG. 6 and FIG. 7 are views showing another example of the positional relationship between the coolant tube 4 and the fluorescent tube 3 in the above-described embodiments, FIG. 6 is a front view thereof, and FIG. 7 is a perspective view thereof. FIG. The illustrated example shows a case where the fluorescent tubes 3 are formed in a U-shape, and the coolant tubes 4 reciprocate up and down the upper and lower portions of the respective fluorescent tubes 3, and the end portions of the fluorescent tubes 3 are at the ends. The curved pipe portions are crossed in three dimensions, and are connected to the liquid passage 15 after being connected in the vertical direction, thereby forming a coolant circulation path, and is connected to the coolant tank 13 and the pump 14. Reference numeral 19 in FIG. 7 denotes an electrode holder for the fluorescent tube 3. In the above-described embodiment, a thin display device having a liquid crystal panel has been described. However, the present invention can be similarly applied to a thin display device having a PDP.
[0015]
【The invention's effect】
As described above, according to the present invention, by disposing the cooling liquid tube filled with the cooling liquid in the display panel portion that generates heat to absorb the heat generation of the display panel, compared to cooling by a conventional fan, It has excellent cooling efficiency and eliminates noise. In addition, when the thin display device has a speaker, it is possible to suppress chatter noise by disposing a coolant tank in the speaker portion. Furthermore, in the case of a thin display device provided with a stand, the center of gravity is lowered and the stability is improved by disposing the coolant tank in the stand.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing a first embodiment of a thin display device according to the present invention.
FIG. 2 is a longitudinal sectional view showing a second embodiment of a thin display device according to the present invention.
FIG. 3 is a longitudinal sectional view showing a third embodiment of a thin display device according to the present invention.
FIG. 4 is a front view showing another example of the positional relationship between the coolant tube and the fluorescent tube.
FIG. 5 is a perspective view of FIG. 4;
FIG. 6 is a front view showing another example of the positional relationship between the coolant tube and the fluorescent tube.
7 is a perspective view of FIG. 6. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Reflector 3 Fluorescent tube 4 Coolant tube 5 Substrate 6 Hygroscopic dehumidifier 7 Front housing 8 Rear housing 9 Lower housing 10 Speaker 11 Stand 12 Base part 13 Coolant tank 14 Pump 15 Liquid path 17 Transparent Hole 18 Pipe 19 Electrode holder

Claims (10)

A thin display device characterized in that a cooling liquid tube filled with a cooling liquid is disposed in a display panel portion that generates heat to absorb and / or diffuse heat generated by the display panel. In a thin display device having a display panel that generates heat,
A coolant tube arranged at an appropriate interval in the display panel, and
A coolant tank connected to both ends of the coolant tube via a liquid path;
A cooling liquid circulation pump provided in the middle of the liquid path connecting the cooling liquid tube and the cooling liquid tank or between the cooling liquid tank and the liquid path;
A thin display device comprising: The thin display device according to claim 1 or 2,
In the case where the display panel has a backlight composed of a reflecting plate and a fluorescent tube, the cooling liquid tube is disposed on the front surface and / or the back surface of the reflecting plate along the fluorescent tube. . The thin display device according to claim 3.
When the cooling liquid tube is arranged on the surface of the reflecting plate, a thin display device is characterized in that a reflecting paint having substantially the same reflectance as that of the reflecting plate is applied to the surface of the cooling liquid tube. The thin display device according to any one of claims 1 to 4,
In the case where the thin display device main body has a speaker, the cooling liquid tank is disposed in the vicinity of the speaker. The thin display device according to any one of claims 1 to 5,
When the lower part of the thin display device main body is supported by a stand, the cooling liquid tank is arranged in the stand. The thin display device according to claim 6,
When the stand has a hollow structure, a thin display device comprising a plurality of ventilation holes formed in a surface portion of the stand. The thin display device according to claim 6 or 7,
A thin display device, wherein the liquid passage is disposed on a surface portion of the stand to dissipate the cooling liquid. The thin display device according to claim 1,
A thin display device characterized in that a hygroscopic dehumidifying agent is disposed below the cooling liquid tube, the cooling liquid tank, the liquid path, or the cooling liquid circulation pump. The thin display device according to any one of claims 1 to 9,
A thin display device using water as the coolant.

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