JP2885147B2 - Plasma display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device using a plasma display panel.

[0002]

2. Description of the Related Art In recent years, an image display apparatus using a plasma display panel (hereinafter referred to as PDP) has been developed.

FIG. 7 shows a light emitting state of the plasma display panel. The PDP has each element of RGB for each dot, and each element emits light by discharging and has a light emission color for each dot. Therefore, the amount of heat generated varies depending on the emission color. For example, when the color of a certain dot is white, each of the RGB elements emits light by discharging, and when the color is black, none of the elements discharge.
Therefore, there is a difference in the calorific value depending on the location.

[0004] For this reason, depending on the screen displayed on the PDP, a considerable temperature difference occurs between a portion having many light emitting elements and a portion having a small number of light emitting elements. There was a danger that the panel itself would be cracked due to a heavy load.

Further, since the amount of heat generated is large depending on the screen on which the PDP is projected, the temperature may become higher than the limit temperature which affects the performance of the panel itself.

Hereinafter, a conventional image display apparatus and a heat transfer system at this time will be described with reference to the drawings.

Each dot is of a self-luminous and self-heating type,
FIG. 8 shows a heat dissipation structure of a thin and large image display device.

In FIG. 8, reference numeral 1 denotes a PDP for displaying an image;
Is a double-sided tape for attaching an aluminum plate to a PDP,
Reference numeral 3 denotes an aluminum flat plate used for heat radiation, and reference numeral 4 denotes a heat radiation fin for increasing the heat radiation capability . Using a double-sided tape 2 around the PDP 1 , an aluminum flat plate 3 to which heat radiation fins are attached by screws is attached.

FIG. 9 shows an example of the temperature state of the PDP 1 and the aluminum flat plate 3. 10 and 12 show the state of heat transfer between the PDP 1 and the aluminum plate 3, and FIG. 11 shows the state of heat conduction on the aluminum plate 3. The solid line in FIG. 9 shows the temperature distribution in the case of a single panel. At this time, at the point A in FIG. 9, that is, at a place where the calorific value is high on the PDP 1, as shown in FIG. 10, the heat generated from the PDP 1 is also transmitted to the mounted aluminum flat plate 3, and as shown in FIG. Due to the high thermal conductivity of the aluminum flat plate 3, as shown by the dashed line graph in FIG. Further, as shown on point B in FIG.
At a place where the calorific value of DP1 is low, heat is transferred from the aluminum flat plate 3 to the PDP 1 as shown in FIG. 12, and as shown by a broken line graph in FIG. In addition, since the heat capacity of receiving heat generated in the PDP 1 is the PDP and the aluminum plate 3, the temperature rise of the PDP 1 can be suppressed. Further, the heat dissipation fins 4 are attached to the aluminum plate 3 to promote heat dissipation of the panel to the outside air.

[0010]

However, in the above configuration, a gap is formed between the PDP 1 and the aluminum plate 3 due to the thickness of the double-sided tape 2 between the PDP 1 and the aluminum plate 3 . Also PD
P 1 and the aluminum flat plate 3 each have a mechanical distortion of warping or waviness, in the case of the flat plate is large thin rigid as in this case, there are individual differences, which are not intended to coincide, the intact control them It doesn't stay. Therefore, the degree of adhesion between the PDP 1 and the aluminum plate 3 is
Variations occur depending on places where the parts are in close contact, places where gaps are formed, and the like.

There is air in the area where the air does not adhere, and the efficiency of heat transfer from the PDP 1 to the aluminum flat plate 3 is reduced due to the low conductivity of the air. Therefore, depending on the location, PDP
Variation occurs in the heat transfer from 1 to the aluminum plate.

[0012] The PDP 1 cannot specify a portion having a large amount of heat generation from its image display method. Thus increasing the degree of adhesion between the aluminum flat plate 3 for PDP 1 on the entire surface, unless promptly heat transfer to the aluminum flat plate 3, which may cause a temperature difference of more PDP 1 causes cracking.

[0013]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a plasma display device according to the present invention radiates heat through a heat conductive sheet which promotes heat transfer to a plasma display panel. It has a configuration in which a plate is provided.

[0014]

[0015]

According to the present invention, the gap between the plasma display panel and the flat plate is filled with a medium by the above-mentioned structure, so that the plasma display panel and the medium, and the medium and the flat plate can be brought into close contact with each other. This results in a process of transferring heat to the plasma display panel, the medium, and the flat plate. However, variations in the degree of adhesion between locations are reduced, and variations in the efficiency of heat transfer from the plasma display panel to the flat plate are also reduced. Therefore, variation in heat distribution on the plasma display panel is reduced. Further, the heat capacity with respect to the heat generated in the plasma display panel becomes a panel, a medium inserted therebetween, a flat plate, and increases as compared with the case of a panel or a flat plate.

Further, the aluminum to be mounted on the plasma display panel is processed so that the rigidity of the flat plate is reduced as the mechanical distortion of the plasma display panel is followed. By using this flat plate, the degree of adhesion between the panel and the aluminum flat plate mounted on the panel is increased, and heat transfer between the plasma display panel and the flat plate is promoted.

[0017]

An embodiment of the present invention will be described below with reference to the drawings.

Embodiment 1 FIG. 1 is a configuration diagram of a plasma display device according to an embodiment of the present invention.

In FIG. 1, 1 is a plasma display panel PDP for displaying an image, 2 is a double-sided tape for attaching an aluminum plate to the PDP, 3 is an aluminum plate for radiating heat of the PDP, 4 is a radiating fin, 7 has the same function as that of FIG. Reference numeral 5 denotes a putty 5 which contains silicon to increase thermal conductivity, remove a curing agent, and suppress the property of curing. The putty 5 is inserted between the PDP 1 and the aluminum plate 3 in a structure in which the PDP and the aluminum plate are mounted.

FIG. 2 shows the state of the putty 5 when the aluminum flat plate 3 is mounted on the PDP 1. Putty 5 is inserted between PDP 1 and aluminum flat plate 3 so that aluminum flat plate 3 is pressed against PDP 1. At this time, as shown in FIG. 2, the gap due to mechanical distortion between the PDP 1 and the aluminum plate 3 is filled with the viscosity, plasticity, and adhesiveness of the putty 5, and the PDP 1, the putty 5, and the putty 5 are filled.
And the aluminum plate 3 can achieve close contact with the ideal. As a result, the heat transfer efficiency between the PDP 1 and the putty 5 and between the putty 5 and the aluminum flat plate 3 increases, and the heat transfer efficiency from the PDP 1 to the aluminum flat plate 3 increases. In addition, variation in heat transfer efficiency depending on locations is reduced, and the temperature difference on the PDP is reduced.

In this case, the medium inserted between the PDP 1 and the aluminum plate 3 has sufficient viscosity to fill a gap created by mechanical distortion between the PDP 1 and the aluminum plate 3, and promotes heat transfer between the PDP and the aluminum plate. A similar effect can be obtained by using a material having high thermal conductivity, such as liquid silicon grease or a sheet.

Embodiment 2 FIG. 3 is a block diagram of a plasma display device according to an embodiment of the present invention.

In FIG. 3, reference numeral 1 denotes a PDP for displaying an image;
Is an aluminum flat plate processed to increase the degree of adhesion to the panel, and 4 is a radiation fin. In explaining, PDP
1. The system of heat conduction and heat transfer of the aluminum plate 6 is the same as the conventional system, and the description is omitted.

The aluminum plate 6 shown in FIG. 4 has grooves 4 mm wide and 6 mm deep at a pitch of 100 mm in the longitudinal direction. By providing such a groove, the PDP 1 is characterized in that the decrease in volume is suppressed to be smaller than that of the conventional aluminum flat plate, and that the radiation fins 4 can be mounted with screws.
Stiffness that follows the mechanical distortion such as warpage and undulation. Therefore, the degree of adhesion between the PDP and the aluminum flat plate 6 is increased as shown in FIG.

At this time, the degree of adhesion between the PDP 1 and the aluminum flat plate 6 depends on each gap due to the inconsistency of mechanical distortion such as warpage and undulation between the PDP 1 and the aluminum flat plate 3 shown in FIG. We turn to the problem of gaps caused by the surface roughness of the object. Also it is possible to increase the degree of adhesion PDP1 the aluminum flat plate 6 in the case of the this therefore does not use the medium having a property to fill the gap. Therefore PD
The heat transfer efficiency between P1 and the aluminum flat plate 6 is increased, and the variation in heat transfer efficiency between locations is reduced, and the temperature difference on the PDP is reduced.

Further, in this case, the groove having the structure described in the embodiment is provided. However, if the groove is provided in the longitudinal direction, the warp and undulation in the vertical direction of the embodiment will be followed. Further, if the pitch at which the grooves are provided is made narrower, or the width of the grooves is made larger, it becomes easier to follow the groove. Thus, even if the direction, width, depth, pitch, etc. of the groove are changed, PD
The degree of adhesion between P and the flat plate can be increased, and the heat radiation effect can be increased.

Also, as shown in FIG.
580mm x 380mm aluminum plate, 2mm thick, size 98
Even when six aluminum flat plates of mm × 380 mm are mounted, they have the same properties as the aluminum flat plate subjected to the processing described in the second embodiment, and the same adhesion and heat radiation effects can be obtained.

[0028]

As described above, according to the present invention, in a plasma display panel in which each dot is a self-luminous, self-heating type, thin, large-size image display device, the plasma display panel and the plasma display panel emit heat. In addition, the effect of increasing the adhesion of the flat plate mounted on the plasma display panel to the entire surface and increasing the heat transfer efficiency between the plasma display panel and the flat plate can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a video display device according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view of the image display device according to the first embodiment of the present invention.

FIG. 3 is a configuration diagram of a video display device according to a second embodiment of the present invention.

FIG. 4 is a view showing an aluminum flat plate provided with a groove according to a second embodiment of the present invention.

FIG. 5 is a diagram showing the degree of adhesion between a PDP and a processed aluminum flat plate according to a second embodiment of the present invention.

FIG. 6 is a view showing an aluminum plate according to a second embodiment of the present invention.

FIG. 7 is a diagram showing a state of light emission of a plasma display panel.

FIG. 8 is a configuration diagram of a conventional video display device.

FIG. 9 is a diagram showing a temperature distribution of a panel and an aluminum flat plate.

FIG. 10 is a diagram showing heat transfer from a PDP to an aluminum plate.

FIG. 11 is a diagram showing heat conduction in an XY axis direction on an aluminum plate.

FIG. 12 is a diagram showing a state of heat transfer from an aluminum plate to a PDP.

FIG. 13 is a diagram showing a gap between a PDP and an aluminum flat plate.

FIG. 14 is a diagram showing the degree of adhesion between a PDP and an aluminum flat plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 PDP 2 Double-sided tape 3 Aluminum flat plate 4 Radiation fin 5 Putty containing silicon 6 Aluminum flat plate with groove 7 Temperature of PDP single body 8 Temperature of aluminum flat plate 9 Temperature of PDP affected by aluminum flat plate 10 Air

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kenichiro Kitani 1-13-3 Nagao Furniture Town, Hirakata City, Osaka Prefecture Inside of Kitani Electric Co., Ltd. (56) References JP-A-5-121005 (JP, A) JP JP-A-1-125896 (JP, A) JP-A-7-210094 (JP, A) JP-A-7-210093 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) G09F 9 / 00 H04N 5/64 H04N 5/66

Claims (1)

(57) [Claims] 1. A viscous and heat transfer is provided between a plasma display panel for displaying an image or information and a heat sink.
Promoting the heat conductive sheet to the plasma display panel.
A plasma display device provided in direct contact with the panel and the heat sink .