JP2000019974A - Flat panel display - Google Patents

Abstract

(57) Abstract: A flat display device capable of effectively cooling a circuit board and a display panel on which a large number of electric circuit element groups are densely mounted is provided. SOLUTION: A cooling fan is directly provided in a space surrounded by the electric circuit element group on a circuit board on which a large number of electric circuit element groups are densely mounted. Further, a tube having small holes is provided along a space surrounded by the electric circuit element group, and a cooling fan is built in the tube.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device such as a plasma display device, and more particularly to a flat display device having excellent cooling performance.

[0002]

2. Description of the Related Art As is well known, a so-called flat display device such as a plasma display device or a liquid crystal display device surpasses a CRT because it can easily realize a large screen and can be made thin without taking up space. I am doing it. 6 is a front view showing a conventional flat display device, for example, a plasma display device, FIG. 7 is a rear view thereof, and FIG. 8 is a schematic sectional view schematically showing a section taken along line AA of FIG. 6, 7 and 8, reference numeral 1 denotes a plasma display panel (hereinafter, simply referred to as a display panel) having an image surface 1a for displaying an image, and 2 denotes a circuit board arranged at an interval on the back of the display panel. Although not shown in detail in the figure, a large number of electric circuit element groups 31 to 3n constituting a control driving circuit 3 for controlling and driving the display panel 1 are densely arranged on the circuit board 2. It is installed. Reference numeral 2a denotes another similar circuit board disposed at a distance behind the circuit board 2, and FIG. 2 shows a case where two circuit boards 2 and 2a are provided. In some cases, in order to avoid complication, the discussion will be made with an example in which they are combined into one.

An outer case 4 houses the display panel 1 and the circuit board 2, and a front outer cover 4 covering the front half.
a, and a rear exterior cover 4b fitted to cover the rear half portion. 4a1 is a display window provided at a position of the front exterior cover 4a corresponding to the image surface 1a of the display panel 1, 5a and 5b are bolts and nuts for fixing the two exterior covers 4a and 4b, and 6 is A recess formed at the lower center of the rear exterior cover 4b;
Reference numeral 7 denotes an external terminal provided on the ceiling surface of the concave portion 6 for receiving a power supply and various signals such as video and audio.
Is a cooling fan provided at the upper part in the outer case 4,
9 is a ventilation hole provided at a position of the rear exterior cover 4b facing the cooling fan 8, and 9a is a protection net provided at the ventilation hole. Reference numerals 91 and 92 denote ventilation holes provided on the side and lower sides of the rear exterior cover 4b.
Reference numerals a and 92a denote protection nets provided in the ventilation holes 91 and 92.

The conventional plasma display device is configured as described above, but a large number of electric circuit element groups forming a control drive circuit 3 for controlling and driving the display panel 1 mounted densely on the circuit board 2. A large amount of heat is generated from 31 to 3n. In addition, when displaying white light on the display panel 1 itself, a considerable amount of heat is generated because all the red, green, and blue light emitting elements are driven. If such heat is left as it is, it will reach a very high temperature, and a normal display function may be impaired. In order to avoid this in the conventional device, a cooling fan 8 is provided in the upper portion of the outer case 4, and the large amount of heat generated in the outer case 4 by the cooling fan 8 is released to the outside of the outer case 4 through the ventilation hole 9. I have to do that. In this case, the other ventilation holes 91,
Needless to say, 92 is an intake hole.

[0005]

However, the mounting density of the electric circuit element groups 31 to 3n on the circuit board 2 is further increased, and the heat generated therefrom is further increased, while the display panel 1 also has a higher luminance. The generated heat is increasing with the
More effective heat dissipation is desired. However, to achieve more effective heat dissipation with the conventional structure,
It is only possible to increase the capacity of the cooling fan 8 or to increase the number thereof. However, if the mounting density of the electric circuit element groups 31 to 3n on the circuit board 2 is increased and a sufficient space is not provided between the electric circuit elements, or if a large screen and a long ventilation path are required, the cooling fan 8 There is a limit to the heat radiation, even if the number is increased or the number is increased, and the luminance is reduced to suppress the heat generation of the display panel 1 or the connection between the display panel 1 and the circuit board 2 to secure the ventilation passage. It was necessary to increase the interval. As a result, there is a problem that the screen becomes dark or the thickness becomes large.

In particular, the electric circuit element group 31 on the circuit board 2
The mounting density of ~ 3n is increased, and the space formed between the electric circuit elements which is a ventilation path for heat dissipation is meandering in a zigzag shape, is in a maze shape, or is a dead end-shaped dead end. In such a case, the ventilation resistance is further increased, and it is no longer possible to realize sufficient heat radiation with the conventional cooling fan system.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a first object of the present invention is to increase the mounting density of a group of electric circuit elements on a circuit board and to provide a sufficient space between the electric circuit elements. An object of the present invention is to provide a flat panel display device capable of realizing reliable heat radiation even when a proper interval cannot be obtained.

A second object of the present invention is to provide a ventilation path formed between electric circuit elements, whether it is zigzag, maze-shaped, or dead-end. It is an object of the present invention to obtain a flat display device capable of sufficiently dissipating heat.

A third object of the present invention is to provide a flat panel display device capable of mainly removing heat from a portion on a circuit board which generates a large amount of heat.

A fourth object of the present invention is to provide a flat display device capable of suppressing a temperature rise of a display panel below an allowable temperature even when a large screen and a long ventilation path are provided. It is.

[0011]

In a flat panel display according to the present invention, a display panel for displaying an image and a large number of electric circuit elements forming a control drive circuit for controlling and driving the display panel are densely packed. The circuit board mounted on the display panel is disposed at an interval on the back surface of the display panel, and a cooling fan is provided in a space on the circuit board surrounded by the electric circuit element group.

Further, a cooling fan is provided in a space in the vicinity of the electric circuit element group which generates a large amount of heat.

Further, a cooling fan is provided in a space formed as a dead end surrounded by a group of electric circuit elements on a circuit board.

Further, a cooling fan is provided in each of a plurality of spaces surrounded by a group of electric circuit elements on the circuit board, and the cooling fan can be selectively driven.

Still further, a cooling fan group comprising a combination of an axial fan and a centrifugal fan is provided along a space formed between the electric circuit element groups on the circuit board.

Further, a tube having small holes is arranged along the space formed between the electric circuit element groups on the circuit board, and a cooling fan is built in the tube. .

Further, a plurality of cooling fans are incorporated in a tube provided along a space formed between the electric circuit element groups on the circuit board.

Furthermore, a tube provided along a space formed between the electric circuit element groups on the circuit board is provided.
The built-in part of the cooling fan is made of a hard material, and the others are made of a soft material.

The distal end of the tube provided along the space formed between the electric circuit element groups on the circuit board is opened in a space formed by the electric circuit element groups and formed in a blind alley. It is intended to be.

In addition, a display panel for displaying an image and a circuit board on which a large number of electric circuit elements forming a control drive circuit for controlling and driving the display panel are densely mounted are mounted on the display panel. A cooling fan is provided between the circuit board and the display panel at intervals on the rear surface.

Further, a plurality of cooling fans are provided between the circuit board and the display panel, and the cooling fans can be selectively driven.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First Embodiment FIG. 1 is a plan view of a circuit board according to a first embodiment of the present invention. The overall configuration of the flat panel display device is substantially the same as that of the conventional device shown in FIGS. 6 to 8, and therefore will not be described. In FIG. 1, reference numeral 2 denotes a circuit board, which is arranged at an interval on the back surface of the display panel 1 in the outer case 4 as in the conventional case shown in FIGS. Reference numerals 31 to 3n denote a large number of electric circuit element groups constituting a control drive circuit for controlling and driving the display panel 1, and these large number of electric circuit element groups 31 to 3n are arranged on the circuit board 2 as shown in FIG. Mounted densely. Reference numeral 8 denotes a cooling fan provided in the upper part of the outer case 4 similarly to the conventional device, and has the same function as that of the conventional device in releasing the heat generated in the outer case 4 to the outside of the outer case.

Reference numeral 10 denotes a number of electric circuit element groups 31 to 3n
Are densely mounted and the electric circuit element group 31 on the circuit board 2
3n is a cooling fan provided in a space 11 surrounded by 〜3n, and radiates heat of the space 11 and heat generated from electric circuit elements in the periphery of the space to the periphery of the circuit board 2 to guide the cooling fan 8 to Case 4 via a cooling fan 8
Release outside. That is, the heat of the central portion of the circuit board 2 with poor ventilation can be effectively guided to the cooling fan 8 by the cooling fan 10, and reliable heat radiation can be realized. Of the cooling fans 10, 10a with a suffix a is an axial fan and 10b with a suffix b is a centrifugal fan. Which type of cooling fan is used depends on the electric circuit element group 31. And the shape of the space 11 surrounded by
Alternatively, a convenient one may be selected in consideration of the gap formed between the electric circuit elements around the circuit board 2, that is, the ventilation path 12.

The cooling fans 10a and 10b are provided in the space 11 surrounded by the electric circuit element groups 31 to 3n as described above.
By arranging in the space 11 surrounded by 空間 3n, more effective cooling can be realized.

Since the cooling fan 10 is provided on the circuit board 2, it must be very small.
mm, motor diameter 4.2 mm, axial flow fan integrated with a motor having a total length of fan and motor of 36 mm, and motor integrated type having a fan diameter of 6 mm, motor diameter of 4.2 mm, and a total length of fan and motor of 36 mm Since each centrifugal fan has been developed and sold by the company, for example, the present invention can be implemented by using such a fan, but it is not limited to this fan from the beginning, and it is further downsized. Can be used without any problems,
It goes without saying that the present invention can be implemented similarly.

Embodiment 2 FIG. 2 is a plan view abstractly showing one half of a circuit board according to Embodiment 2 of the present invention. In FIG. 2, the electric circuit element groups 31 to 3n are represented by dashed lines in blocks for convenience of explanation. In FIG. 2, 2 is a circuit board, 3
1 to 3n are electric circuit element groups densely mounted on the circuit board 2, 11 is a space surrounded by the electric circuit element groups 31 to 3n, and 12 is formed between the electric circuit element groups 31 to 3n. The gap, that is, the ventilation passage 10, is a cooling fan provided in the space 11 on the circuit board 2, and the subscripts a and b are as described in FIG.

It should be noted here that the spaces 11a and 11b are connected to the ventilation passage 12 on one side, while the other is a dead-end-shaped blind lane. In the present invention, the cooling fans 10a and 10b are provided in the spaces 11a and 11b. According to the conventional apparatus, the spaces 11a and 11b that have become the dead ends have extremely poor ventilation, and therefore cannot sufficiently remove the heat of the space and the electric circuit element groups 31 to 3n around the spaces. The cooling fans 10a, 1a are directly provided in the spaces 11a, 11b.
Since 0b is provided, it is possible to reliably remove heat in the space and the space surrounding the space.

In FIG. 2, similarly to FIG. 1, a plurality of cooling fans 10 are provided, but it is not necessary to always drive all of the plurality of cooling fans 10. For example, the cooling fan 10 to be driven is determined in advance according to the operation time, or temperature sensors are provided in various places, although not shown in the drawing, and cooling is further performed based on each output from the temperature sensors. In other words, if the desired cooling fan 10 is selectively driven, for example, by driving the cooling fan 10 at the most suitable location,
A flat display device having ideal cooling performance can be obtained without consuming unnecessary power.

Further, as shown in FIG. 2, the space 11 surrounded by the electric circuit element groups 31 to 3n, the electric circuit element group 31
To 3n, the axial flow fan 10a may be arranged in a zigzag manner or in a maze.
By appropriately changing and controlling the ventilation direction by the combination of the cooling fan group and the centrifugal fan 10b, that is, by forming a desired flow path by the cooling fan group, the heat of the circuit board 2 is efficiently carried out of the circuit board 2, It can be led to the cooling fan 8. In such a conventional apparatus, in such a case, since the ventilation resistance becomes large, heat radiation particularly at the central portion of the circuit board 2 has been a problem. However, according to the present invention, this problem can be easily solved.

Third Embodiment FIG. 3 is a sectional view showing a ventilation path on a circuit board according to a third embodiment of the present invention. In FIG. 3, reference numeral 13 denotes a flexible tube provided along the ventilation path 12 on the circuit board 2 and made of, for example, vinyl, 10 denotes a cooling fan built in the tube, and 13a denotes the above-described cooling fan. There are a number of small holes drilled at appropriate places in the tube 13. A gap formed between the electric circuit element groups 31 to 3n, that is, the ventilation path 12, and / or the electric circuit element groups 31 to 3n
n, the tube 13 is drawn around the space 11 (which is well represented in FIG. 2 described above), and the small holes 13a are mainly provided at the locations serving as heat sources. Heat can be efficiently removed from the heat source even in a different position. Further, by changing the thickness of the tube 13 or changing the diameter of the small hole 13a, it is possible to obtain an optimum ventilation amount corresponding to the heat source.

Fourth Embodiment FIG. 4 is a sectional view showing a ventilation path on a circuit board according to a fourth embodiment of the present invention. In FIG.
A plurality of cooling fans 10 (two cases are shown in the figure) are built in the inside, and the tube 13 is made of a hard material such as metal for the built-in portion 13b of the cooling fan 10, and the other portion 13c is made of vinyl or the like. Each of them is made of a flexible material. By incorporating a plurality of cooling fans 10, a large amount of ventilation can be obtained, and the constituent material of the tube 13 is formed of a hard material for the built-in portion 13b and a flexible material for the other portion 13c. As a result, while securing the freedom of drawing the tube 13,
The cooling fan 10 can be protected safely.

In FIG. 4, the same applies to FIG. 3, but it is conceivable that the distal end of the tube 13 is opened to the spaces 11a and 11b (see FIG. 2) which are dead ends. Thereby, even if the cooling fan is located at a remote position, the heat in the space with poor ventilation and the heat around the space can be reliably removed.

Embodiment 5 FIG. 5 is a sectional view showing an example of a display panel and a circuit board according to an embodiment of the present invention. In FIG. , A heatsink attached to the back surface of the display panel 1, a spacer 15 for keeping a space between the display panel 1 and the circuit board 2, and 31 to 3 n densely arranged on the circuit board 2. The electric circuit element group 10 mounted as above is a cooling fan provided between the display panel 1 and the circuit board 2. In addition,
The figure shows a case where a cooling fan 10 is provided also between the electric circuit element groups 31 to 3n on the circuit board 2.

Naturally, when the screen becomes large, the ventilation path formed between the display panel 1 and the circuit board 2 becomes long, and the conventional cooling fan 8 alone can sufficiently cool the display panel 1. Becomes difficult. According to the present invention, since the cooling fan 10 is provided directly between the display panel 1 and the circuit board 2, sufficient cooling air can be secured, and the temperature rise of the display panel 1 can be suppressed reliably. Can be.

In FIG. 5, two cooling fans 10 are provided between the display panel 1 and the circuit board 2.
The number is not limited to two, but may be determined by the size of the screen, the allowable temperature, and the like. In this case, it is not necessary to always drive all the cooling fans 10 installed. For example, the cooling fan 10 to be driven is determined in advance according to the operation time, or temperature sensors are provided in various places, although not shown in the drawing, and cooling is further performed based on each output from the temperature sensors. In other words, if the desired cooling fan 10 is selectively driven, for example, by driving the cooling fan 10 at the most suitable location, the flat display can suppress the temperature rise of the display panel without consuming unnecessary power. A device can be obtained.

In the above-described embodiment, the case where the present invention is applied to a plasma display device has been described. However, the present invention is not limited to a plasma display device, and may be applied to other flat display devices such as a liquid crystal display device. It goes without saying that it can be applied.
Further, the cooling fan used in the present invention may be any of a blower type (exhaust type) and a suction type (intake type), and any convenient one may be selected according to the installation location.

[0037]

Since the present invention is configured as described above in detail, the following effects can be obtained. According to the first aspect, since the cooling fan is provided directly in the space surrounded by the electric circuit element group on the circuit board on which a large number of electric circuit element groups are densely mounted, the cooling fan is provided from the entire surface of the circuit board. A flat display device with excellent cooling performance that can remove heat can be obtained.

According to the second aspect of the present invention, since the cooling fan is provided directly in the space near the electric circuit element group that generates a large amount of heat, uniform and more effective cooling can be realized over the entire surface of the circuit board. .

According to the third aspect of the present invention, the cooling fan is provided directly in the space formed by the dead ends surrounded by the electric circuit element group. Even so, the heat can be reliably released.

According to the fourth aspect, cooling fans are provided in a plurality of spaces surrounded by the electric circuit element groups on a circuit board on which a large number of electric circuit element groups are densely mounted. Since the cooling fan is selectively driven, it is possible to obtain a flat display device capable of sufficiently dissipating heat while eliminating unnecessary power consumption.

According to the fifth aspect of the present invention, the axial fan and the centrifugal fan are formed on the circuit board on which a large number of electric circuit element groups are densely mounted, along the ventilation path formed between the electric circuit element groups. Since the combined cooling fan group is provided, desired heat radiation can be ensured even if the ventilation path is zigzag or maze.

According to the sixth aspect, a tube having small holes is provided anywhere along the space formed between the electric circuit element groups on the circuit board, and a cooling fan is built in the tube. Therefore, heat from the heat source can be efficiently released.

According to the seventh aspect, a tube having small holes is provided along a space formed between the electric circuit element groups on the circuit board, and a plurality of cooling fans are provided in the tube. Since the cooling air is incorporated, a large amount of cooling air can be obtained.

According to the eighth aspect, the material of the tube provided along the space formed between the electric circuit element groups on the circuit board is hard in the cooling fan built-in portion and flexible in the other portions. As a result, the cooling fan can be protected while securing the freedom of drawing the tube.

According to the ninth aspect, the distal end portion of the tube provided along the space formed between the electric circuit element groups on the circuit board is replaced with a dead space surrounded by the electric circuit element groups. The heat from the heat source separated from the cooling fan can be intensively and efficiently removed.

According to the tenth aspect, since the cooling fan is provided between the display panel and the circuit board, the temperature rise of the display panel can be reliably suppressed to an allowable value or less even when the screen becomes large. it can.

According to the eleventh aspect, a plurality of cooling fans are provided between the display panel and the circuit board, and these cooling fans are selectively driven, so that unnecessary power consumption is eliminated. A flat display device capable of efficiently cooling a display panel can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a circuit board according to a first embodiment of the present invention.

FIG. 2 is a plan view abstractly showing one half of a circuit board according to a second embodiment of the present invention.

FIG. 3 is a sectional view showing a ventilation path on a circuit board according to Embodiment 3 of the present invention;

FIG. 4 is a sectional view showing a ventilation path on a circuit board according to Embodiment 4 of the present invention;

FIG. 5 is a sectional view showing an example of a display panel and a circuit board according to a fifth embodiment of the present invention.

FIG. 6 is a front view showing a conventional flat display device.

FIG. 7 is a rear view showing a conventional flat display device.

FIG. 8 is a schematic sectional view schematically showing a section taken along line AA of FIG. 6;

[Explanation of symbols]

1 display panel, 2 circuit board, 3 control drive circuit, 3
1 to 3n electric circuit element group, 4 outer case, 8 cooling fan, 10 cooling fan, 10a axial fan, 10
b Centrifugal fan, 11 spaces, 11a, 11b Dead-path space, 12 ventilation passages, 13 tubes, 13a small holes, 13b Built-in cooling fan, 13c and other parts.

Claims (11)

[Claims] A display panel for displaying an image; a control drive circuit including a plurality of electric circuit elements for controlling and driving the display panel; A flat display device comprising: a circuit board on which circuit element groups are densely mounted; and a cooling fan provided in a space on the circuit board surrounded by the electric circuit element group. 2. The flat display device according to claim 1, wherein a cooling fan is provided in a space near the group of electric circuit elements that generates high heat. 3. The flat display device according to claim 1, wherein the space is a blind alley. 4. A display panel for displaying an image, a control drive circuit including a plurality of electric circuit elements for controlling and driving the display panel, and a plurality of electric circuits arranged at intervals on a back surface of the display panel. A circuit board on which the circuit element groups are densely mounted; and cooling fans provided in a plurality of spaces surrounded by the electric circuit element group on the circuit board, and the cooling fans can be selectively driven. A flat panel display characterized by the above. 5. A display panel for displaying an image, a control drive circuit constituted by a group of electric circuit elements for controlling and driving the display panel, and a plurality of electric circuits arranged on the back of the display panel at intervals. A circuit board on which circuit element groups are densely mounted, and a cooling fan group including a combination of an axial fan and a centrifugal fan provided along a space formed between the electric circuit element groups on the circuit board. A flat panel display device comprising: 6. A display panel for displaying an image, a control drive circuit comprising a plurality of groups of electric circuit elements for controlling and driving the display panel, and a plurality of electric circuits arranged at intervals on a back surface of the display panel. A circuit board on which circuit element groups are densely mounted, a tube provided with small holes everywhere provided along a space formed between the electric circuit element groups on the circuit board, built in the tube A flat display device, comprising: a cooling fan. 7. The flat display device according to claim 6, wherein a plurality of cooling fans are built in the tube. 8. The flat display device according to claim 6, wherein the tube is made of a hard material in the cooling fan built-in portion and made of a flexible material. 9. The flat display device according to claim 6, wherein a distal end portion of the tube is opened in a space of a blind alley surrounded by the electric circuit element group. 10. A display panel for displaying an image, a control drive circuit comprising a plurality of electric circuit element groups for controlling and driving the display panel, and a plurality of electric drives arranged at intervals on a back surface of the display panel. A flat display device comprising: a circuit board on which circuit element groups are densely mounted; and a cooling fan provided between the circuit board and the display panel. 11. A display panel for displaying an image, a control drive circuit comprising a plurality of groups of electric circuit elements for controlling and driving the display panel, and a plurality of electric drives arranged at intervals on the back of the display panel. A circuit board on which the circuit element groups are densely mounted; a plurality of cooling fans provided between the circuit board and the display panel; and the cooling fans can be selectively driven. Flat display device.