JP3648044B2 - Plasma display panel device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plasma display panel device, and more particularly to a heat dissipation structure of a plasma display panel that prevents destruction due to thermal strain.
[0002]
[Prior art]
FIG. 18 shows a partially broken plan view of a general plasma display panel (hereinafter abbreviated as PDP).
[0003]
The PDP 1 is configured by bonding a front panel 2 and a back panel 3 formed of glass each having a certain thickness. Note that. FIG. 18 is a view as seen from the back panel 3 side.
[0004]
Both the front panel 2 and the back panel 3 are rectangular, but the sizes thereof are different from each other. In a general PDP, the front panel 2 is larger in the long side direction, and the short side is long. The direction of the back panel 3 is larger in the direction. The two are overlapped with each other so that their longitudinal central axes are orthogonal to each other and form a symmetrical shape. For this reason, the front panel 2 protrudes from the back panel 3 at the ends in the longitudinal direction (that is, both short sides). This portion is referred to as the front projecting portion 2A. Further, the back panel 3 protrudes from the front panel 2 at the ends in the short direction (that is, both long sides). This portion is referred to as the back overhang portion 3A. In the following description, the front projecting portion 2A and the back projecting portion 3A may be collectively referred to as a projecting portion, and the front panel 2 and the back panel 3 may be collectively referred to as a panel.
[0005]
The front panel 2 and the back panel 3 are arranged in parallel with each other so that the faces facing each other are kept at a predetermined distance, and the front edge of the overlapping portion of both is kept airtight over the entire circumference. A peripheral sealing member 4 for adhering the panel 2 and the back panel 3 is disposed.
[0006]
A space surrounded by the panels 2 and 3 and the peripheral sealing member 4 is filled with a predetermined gas. An effective portion 5 that is an image display portion is formed in common with the panels 2 and 3 further inside the region surrounded by the peripheral sealing member 4. Below, the outer periphery outline (imaginary line) of the effective part 5 is called the effective part boundary 5A. The effective portion boundary 5A is set to be substantially parallel to the peripheral sealing member 4 with a slight distance.
[0007]
On the front panel 2, a predetermined number of discharge electrodes 10 are regularly arranged in a direction parallel to the long side over the entire effective portion 5. Here, the AA cross section in FIG. 18 is shown in FIG.
[0008]
As shown in FIG. 19, a predetermined number of the discharge electrodes 10 are provided such that their end portions extend beyond the position where the peripheral sealing member 4 is disposed and extend to the left front projecting portion 2A toward FIG. This portion is a power supply terminal 10A. A conductive foil 11A provided in close contact with a flexible printed circuit (FPC) 11 which is a flexible printed circuit board is connected to the power supply terminal 10A, and is electrically connected to the circuit board 20 through the conductive foil 11A. It is the composition which becomes.
[0009]
The remaining discharge electrodes 10 are provided so as to extend to the right front projecting portion 2A toward FIG. 18, and are electrically connected to another circuit board (not shown) by the above-described structure. ing.
[0010]
On the other hand, on the back panel 3, discharge electrodes (not shown) are regularly arranged in a direction parallel to the short side over the entire effective portion 5. These are connected to a circuit board (not shown) through a conductive foil provided in close contact with the FPC so as to reach the back projecting portion 3A. In addition, since this part is the same as that of the front panel 2 mentioned above, description and illustration are abbreviate | omitted.
[0011]
18 shows a configuration in which the FPC 11 is connected only to the lower back projecting portion 3A. However, the FPC 11 may be provided only on the upper back projecting portion 3A, or may be provided on both upper and lower sides simultaneously. .
[0012]
The image is displayed on the effective portion 5 surrounded by the effective portion boundary 5A which is a virtual line. That is, plasma discharge is caused between the discharge electrodes 10 in this region, and ultraviolet light generated by this discharge is converted into visible light by a phosphor (not shown) applied to the inner surface of the back panel 3, and this visible light is converted. Is emitted from the effective portion 5 of the substantially transparent front panel 2. The viewer of the image views this visible light image from the front panel 2 side.
[0013]
As described above, since plasma discharge is used for image display in the PDP, there is considerable heat generation in the active part 5 of the PDP in operation, and depending on the operating conditions, a temperature difference occurs in the same panel. As a result, a large thermal strain occurs, and in the worst case, there is a problem that the panel made of glass is destroyed.
[0014]
For this reason, the PDP has been devised for heat dissipation. For example, Japanese Patent Laid-Open No. 9-22658 discloses a configuration in which a cooling fan is attached near the outer surface of the back panel to perform forced air cooling. Japanese Patent Laid-Open No. -97015 discloses a configuration in which a heat transfer member having a high thermal conductivity such as an aluminum plate is attached to the back panel to promote cooling and prevent uneven temperature distribution.
[0015]
[Problems to be solved by the invention]
However, forced air cooling has various problems. In particular, when a PDP is used for viewing an image, slight noise generated by forced air cooling becomes a problem. Therefore, it is necessary to first pursue a static cooling means for attaching a heat transfer member to the panel to the limit even if the configuration in which the fan is provided is not abandoned.
[0016]
Here, when the heat transfer member is attached to the panel, a circuit board (for example, the circuit board 20 in FIG. 19) for operating the PDP disposed on the back panel, the above-described fan (forced air cooling device), etc. It is necessary to secure a place for providing a structure for fixing the accessory device. In addition, it is necessary to secure a place for providing a configuration for attaching the PDP itself to which these accessory devices are attached to the casing of the display device.
[0017]
Furthermore, in general, there is a problem of manufacturing yield in the PDP, and not all manufactured products are good products. Therefore, when the PDP is determined to be defective after attaching a heat transfer member or the like to the panel, To reduce the cost, it is important to separate and recover the attached heat transfer member and panel so that they can be reused by an appropriate process.
[0018]
In addition, ensuring that the heat transfer member and the panel can be separated is also important from the viewpoint of separating waste when the member is discarded.
[0019]
The present invention has been made to solve the above-described problems, and is intended to cool a PDP in operation by a static cooling means, and to efficiently eliminate thermal distortion generated on the panel surface. It is a first object to provide the configuration.
[0020]
A second object is to provide a structure in which a heat transfer member attached to a panel can be easily separated, and a structure for fixing an attached device such as a circuit board or a forced air cooling device arranged on the back panel side. And providing a specific structure of a static cooling means that secures a place for providing a structure for attaching the PDP to which the accessory device is attached to the housing of the display device. The purpose of 3.
[0021]
[Means for Solving the Problems]
  The plasma display panel device according to claim 1 of the present invention is composed of a glass plate having a certain thickness, and a front panel on which an image is transmitted and displayed, and a certain panel disposed opposite to the front panel. A back panel composed of a glass plate having a thickness of: a heat transfer plate having thermal conductivity affixed to at least a main surface of the back panel not facing the front panel using a double-sided adhesive sheet; The adhesive strength of at least one side of the double-sided pressure-sensitive adhesive sheet isIn the test method described in JIS Z0237,It is in the range of 0.05 kgf / cm to 0.2 kgf / cm when defined by the 90-degree peel adhesion.
[0022]
  According to a second aspect of the present invention, in the plasma display panel device, the heat transfer plate is made of aluminum having a thickness in a range of 0.7 mm to 1.2 mm or an aluminum alloy mainly composed of aluminum.is there.
[0023]
  According to a third aspect of the present invention, there is provided a plasma display panel device comprising a glass plate having a constant thickness, a front panel on which an image is transmitted and displayed, and a fixed panel disposed opposite to the front panel. A back panel composed of a glass plate having a thickness of: a heat transfer plate affixed to at least a main surface of the back panel not facing the front panel; and the main panel of the back panel. Affixed to the surface independently of the heat transfer plateLoadA heavy holding plate, and a frontLoadingHeavy holding plateInIs,PreviousThe load of the plasma display panel including the front panel, the back panel and the heat transfer plateIt is characterized by taking.
[0024]
  According to a fourth aspect of the present invention, there is provided the plasma display panel device, wherein the load holding plate is attached to the back panel.Shear per unit areaAdhesive strength is applied to the heat transfer plate to the back panel.Shear per unit areaStronger than adhesive strength.
[0025]
  According to the present invention, there is provided a plasma display panel device according to claim 5.,PreviousThe double-sided pressure-sensitive adhesive sheet is a tape-like sheet, and is divided into a plurality of parts and affixed to the back panel in the affixing region of the heat transfer plate.
[0026]
  A plasma display panel apparatus according to claim 6 of the present invention isThe double-sided pressure-sensitive adhesive sheet is an acrylic foam sheet.
[0027]
  The plasma display panel device according to claim 7 according to the present invention,The double-sided PSA sheet is a tape-like sheet whose width does not exceed 300 mm.
[0037]
DETAILED DESCRIPTION OF THE INVENTION
<A. Embodiment 1>
<A-1. Cross-sectional configuration of PDP>
FIG. 1 shows a partial cross-sectional view of a PDP 100 as a first embodiment of a plasma display panel (hereinafter abbreviated as PDP) apparatus according to the present invention. The PDP 100 is a so-called 40-type PDP having a diagonal size of 40 inches, and FIG. 1 is a partial cross-sectional view of an edge portion thereof.
[0038]
As shown in FIG. 1, the PDP 100 is configured by bonding a front panel 2 (front panel) and a back panel 3 (back panel) each formed of a glass plate having a certain thickness. The front panel 2 and the back panel 3 have various configurations (electrodes and phosphors) for displaying images as PDPs, and these configurations are collectively referred to as the front panel 2 or the back panel 3. However, in the following description, only the glass plate portion is displayed for the sake of convenience, and illustration and description of other configurations are omitted.
[0039]
The front panel 2 and the back panel 3 are each made of a soda glass flat plate made by a float method having a thickness of 3 mm. Its external shape is a rectangle of about 850 mm × 650 mm. The front panel 2 and the back panel 3 are disposed so as to face each other, and the front panel 2 and the back panel 3 are bonded to the end edge of the overlapping portion of the both while maintaining the airtightness over the entire circumference. The peripheral sealing member 4 is arranged so that a gap of about 0.15 mm is provided therebetween. The peripheral sealing member 4 is made of special adhesive glass, and the formation width is about 5 mm. In the following description, the front panel 2 and the back panel 3 may be collectively referred to as a panel.
[0040]
A double-sided pressure-sensitive adhesive sheet 31 (first double-sided pressure-sensitive adhesive sheet) as an adhesive member is attached to the entire surface of the back panel 3 not facing the front panel 2, and the back panel 3 of the double-sided pressure-sensitive adhesive sheet 31 is attached. A heat transfer plate 30 is affixed to the pressure-sensitive adhesive surface on the opposite side. As the heat transfer plate 30, for example, a corrosion resistant aluminum alloy called A5052P-H34 with a JIS code having a thickness of about 1.0 mm is used.
[0041]
The double-sided pressure-sensitive adhesive sheet 31 is based on an acrylic foam (acrylic foam) tape having a thickness of 0.6 mm and a width of 150 mm. Moreover, the adhesive force between the double-sided pressure-sensitive adhesive sheet 31 and the glass is considerably weaker than that of this general type of pressure-sensitive adhesive sheet, and is of a kind called a weak pressure-sensitive adhesive sheet. The peel adhesive strength of the double-sided pressure-sensitive adhesive sheet 31 is 0.15 kgf / cm when defined by the 90 ° peel adhesive strength. In addition, the definition and measuring method of 90 degree peeling adhesive force are mentioned later.
[0042]
<A-2. Heat transfer plate and double-sided adhesive sheet>
Next, the reason why the combination of the heat transfer plate 30 and the weak adhesive double-sided adhesive sheet 31 is used for the PDP 100 will be described.
[0043]
When the PDP 100 is operated, it is destroyed because when the image is displayed, the panel (the front panel 2 and the back panel 3) consumes power corresponding to the image, and a temperature difference occurs on the same panel. That is, in the bright part of the image, the panel temperature locally rises and thermally expands. As a result, the tensile stress is generated in the part where thermal expansion is small (that is, the dark part of the image).
[0044]
Therefore, the countermeasure is to release the heat of the portion with the large temperature rise to the outside as soon as possible, and at the same time to transmit the heat to the portion with the small temperature rise to minimize the local temperature difference. This is why the heat transfer plate 30 mainly composed of aluminum is attached. Even in an aluminum alloy, its thermal conductivity is about 100 times that of glass and its price is low, so it is optimal for obtaining the above effects.
[0045]
Here, an important point in using the heat transfer plate 30 is that a gap that prevents heat transfer is not generated between the heat transfer plate 30 and the panel (back panel 3 in the present embodiment).
[0046]
In addition, the PDP has a problem of yield. That is, once it is determined that the panel to which the heat transfer plate 30 is past is defective, the heat transfer plate 30 is peeled off from the panel and reused. During the peeling operation, the panel made of glass should not be damaged, and the heat transfer plate 30 should not be greatly warped or broken. This is because warping and creases tend to cause incomplete adhesion in the next use.
[0047]
Therefore, it is necessary to use a combination of materials that satisfy the conflicting requirements of adhesion and peelability for the heat transfer plate 30 and the adhesive member for attaching the heat transfer plate 30 to the panel. When an adhesive member is selected from such a viewpoint, a weak adhesive double-sided pressure-sensitive adhesive sheet is appropriate.
[0048]
<A-3. Evaluation of adhesiveness>
Here, the evaluation regarding adhesiveness becomes a problem. Various methods (indexes) are known as evaluation methods (indexes) for the adhesive strength or holding power of adhesive sheets, but as described above, considering the peeling work for recovery, as a characteristic evaluation index related to this May be an index known as 90-degree peel adhesion.
[0049]
Hereinafter, a method for measuring the 90-degree peel adhesive strength will be described with reference to FIGS. 2 and 3. FIG. 2 is a perspective view for explaining the measurement principle of the 90-degree peeling adhesive force.
[0050]
In FIG. 2, an adhesive sheet sample 101 to be measured for 90-degree peeling adhesive strength is attached to a substrate 102. A sample 101 having a fixed width W (typically 2.5 cm) is once attached to the substrate 102, and then one end is peeled off to provide a tensile end. Then, chucking is performed over the entire width of the end portion, and the substrate is pulled in the direction of 90 degrees with respect to the main surface of the substrate 102 at a speed of 300 mm per minute while being careful to apply a tensile force F over the entire width. . The value obtained by continuously pulling while maintaining 90 degrees and dividing the average pulling force from the position where the film is peeled off to some extent by 60 mm by the width dimension W is the 90-degree peeling adhesive force.
[0051]
For accurate measurement, it is necessary to define in detail the initial crimping method and the method of maintaining 90 degrees, and these are assumed to use the methods defined in JIS Z0237. However, although the material of the adherend is also defined in the JIS standard, in the following description, the test is performed using the material related to the present invention as the adherend.
[0052]
Next, in order to determine the limit of the force that can be applied to the panel without causing glass breakage at the time of peeling, a 90-degree peeling adhesion measuring model as shown in FIG. 3 is adopted. FIG. 3 is a perspective view showing a situation during the peeling operation of the heat transfer plate 30 bonded to the front panel 2 or the back panel 3. In FIG. 3, the front panel 2 (or the back panel 3) is pressed so that the space between the lines P1 and P2 is not lifted from the work table (not shown) by the pressing plate PB. Note that the pressing plate PB is used so that the force for pressing the panel is not concentrated on a specific point on the panel during the operation described below.
[0053]
As shown in FIG. 3, at a point P3 at the center of one short side of the heat transfer plate 30, a force in the vertical direction (arrow direction) is applied to the panel surface, and the heat transfer plate 30 is pulled in this direction. Yes. At this time, the maximum stress σ applied to the peeled area (hatched area in the figure) PR inside the pressing plate PB is σ = 6 Pa / bt²It can be calculated with
[0054]
Here, P is the force pulling the point P3 in the vertical direction, t is the thickness of the panel, and a is the distance from the P1-P2 line of the intersection P4 of the perpendicular line dropped from the point P3 to the panel and the panel.
[0055]
When the heat transfer plate 30 is peeled off, a force to bend the panel in the vertical direction acts on the peeled region PR in the vicinity of the P1-P2 line of the panel, so that the maximum stress σ is P1-P2. It can be said that the tension is in the direction perpendicular to the line.
[0056]
From the above equation, P / b = σt²/ 6a is obtained, 200 kgf / cm, which is known as an allowable strain that does not break the glass.²Is used as the maximum stress σ, and assuming actual work, substituting a = 15 cm and t = 3 mm (= 0.3 cm) yields P / b = 0.2 kgf / cm.
[0057]
Since two glass plates (that is, panels) are stacked, it is assumed that the distortion is half of this. That is, even when two sheets are stacked, they are not closely adhered to each other but are only partially overlapped by the peripheral sealing member 4, so that the value of the thickness t is not changed, and the tensile force P is halved. It is supposed to have become. Further, from the viewpoint of ensuring the safety of work, the allowable strain for safety of the glass structure is ½ of the allowable strain for calculation, so the above value can be adopted, and the peeling of the heat transfer plate 30 is P It turns out that it is necessary to carry out within /b=0.2 kgf / cm.
[0058]
Note that the peeling model shown in FIG. 3 is different from the actual work, and is not exactly the same as the peeling model when measuring the 90-degree peeling adhesive force described in FIG. These values are satisfactory in terms of reliability and are supported experimentally.
[0059]
Here, the limit of the peeling force (P / b = 0.2 kgf / cm) obtained above, in other words, the limit of the adhesive force is hardly seen in a pressure-sensitive adhesive tape for the purpose of maintaining the adhesion. It is weak. In the present invention, the weak adhesive sheet refers to an adhesive having such a degree. Note that the 90 ° peel-off adhesive strength of a general adhesive sheet is usually 1.0 kgf / cm or more when the adherend is made of glass as above.
[0060]
<A-4. Retention characteristics of adhesive sheet>
In the present invention, the weak adhesive sheet as described above is used from the viewpoint of facilitating the peeling off of the heat transfer plate 30, while the adhesive sheet has at least the weight of the heat transfer plate 30. Must be supported against the panel. Here, as an index representing the holding characteristic of the adhesive sheet, a shear holding force can be mentioned.
[0061]
The shear holding force refers to the limit of the shearing force that does not cause a deviation between the adhesive members even when applied for a long time under a predetermined use temperature condition with respect to an adhesive portion of a unit area.
[0062]
It should be noted that it is sufficient if the heat transfer plate 30 can be held by bonding about 10 times its own weight. Then, this value is determined for the aluminum sheet or the aluminum alloy material having a thickness to be used as the heat transfer plate 30 as described below, with a focus on the peelability of the adhesive sheet. Adhesive strength is compatible.
[0063]
That is, it is assumed that an acrylic pressure-sensitive adhesive material is used as the double-sided pressure-sensitive adhesive sheet, but its shear holding force is 30 gf / cm at 90 ° C. (the local maximum temperature expected during the operation of the PDP).²Met. The weight of the heat transfer plate 30 when the corrosion-resistant aluminum alloy having a thickness of about 1.0 mm described above is used is 0.27 g / cm.²Degree. Therefore, the shear holding force when using an acrylic adhesive material having a peeling force of P / b = 0.2 kgf / cm is about 100 times the weight of the corrosion-resistant aluminum alloy, and both the adhesive force and the peelability are compatible. Will do.
[0064]
<A-5. About adhesive side of double-sided adhesive sheet>
Of the double-sided PSA sheet 31, only one PSA side may have the weak viscosity as described above. That is, when a defective product is generated in the PDP and the heat transfer plate 30 needs to be peeled off, the viscosity of the adhesive surface with the heat transfer plate 30 is strong so that the double-sided adhesive sheet 31 remains on the heat transfer plate 30, and the panel By making the adhesive surface on the side weakly viscous as described above, subsequent processing is simplified.
[0065]
This is because, in the case of the heat transfer plate 31, heating, use of a solvent, use of a special tool, or the like is possible when removing the double-sided adhesive sheet 31 attached. Moreover, the storage in the case of waiting for the removal of the double-sided pressure-sensitive adhesive sheet 31 is also easy.
[0066]
On the other hand, if the double-sided PSA sheet 31 remains on the panel side, the panel may be damaged during the removal operation. In addition, although not explained so far, a glass tube protrudes vertically at one corner of the panel surface for gas injection such as exhaust and discharge gas, and is specially used for stacking and storing. A spacer is required.
[0067]
Thus, in the double-sided pressure-sensitive adhesive sheet 31, one pressure-sensitive adhesive surface has a weak viscosity (P / b = 0.2 kgf / cm or less), and the other pressure-sensitive adhesive surface has the same viscosity (P / b) as a general pressure-sensitive adhesive sheet. b = 1.0 kgf / cm or more), the removal work of the double-sided pressure-sensitive adhesive sheet 31 can be facilitated.
[0068]
It goes without saying that both adhesive surfaces of the double-sided adhesive sheet 31 may have the low viscosity as described above. In this case, it is not certain which side of the heat transfer plate 30 and the panel the double-sided pressure-sensitive adhesive sheet 31 will remain when the heat transfer plate 30 is peeled off, but removal is easy because it is weakly viscous.
[0069]
<A-6. About the material of double-sided PSA sheet>
Next, the reason why the double-sided pressure-sensitive adhesive sheet 31 is formed by foaming a foam sheet (foam sheet) having a thickness of 0.6 mm will be described. The double-sided PSA sheet 31 is also required to have a function as a buffer material between the back panel 3 and the heat transfer plate 30 made of glass. If both are in direct contact, the glass will be scratched and this will cause destruction. In addition, it is necessary to prevent the back panel 3 from being damaged by absorbing the difference in extension caused by the difference in thermal expansion coefficient between the back panel 3 and the heat transfer plate 30.
[0070]
Here, the difference in thermal expansion coefficient will be described. Panel glass has a thermal expansion coefficient of about 9 × 10^-6/ ° C, that of aluminum plate (ie heat transfer plate 30) is about 23 × 10^-6/ ° C. If they are joined in parallel (bonded) over a length of 1000 mm (corresponding to the diagonal length of 40-inch PDP), there will be a difference in elongation of about 0.014 mm per 1 ° C temperature. become. If the average temperature of the operating PDP is increased by 50 ° C. from the normal temperature, the difference in elongation reaches 0.70 mm. Assuming that the extension occurs from the center of the panel toward both ends of the diagonal line, the difference in the extension to be absorbed is 0.70 mm / 2 = 0.35 mm.
[0071]
Thereby, the buffer material (that is, the double-sided pressure-sensitive adhesive sheet 31) receives a shearing force in the extending surface. Here, the state where the double-sided pressure-sensitive adhesive sheet 31 has received a shearing force is schematically shown in FIG. FIG. 4 is a view showing a cross section of the edge portion of the heat transfer plate 30, the double-sided pressure-sensitive adhesive sheet 31, and the back panel 3, and the end surface of the double-sided pressure-sensitive adhesive sheet 31 is perpendicular to the bonding surface. It has a shape that is extended to the side and has an inclination. By deforming the double-sided pressure-sensitive adhesive sheet 31 in this way, the stress applied to the back panel 3 is relaxed and the back panel 3 is prevented from being damaged.
[0072]
If the allowable amount of the inclination is 30 degrees, the required thickness is 0.35 × √3 = 0.61 mm if the thickness of the buffer material is not changed by the shearing force. Further, it has been confirmed from the experimental results that a thickness of at least 0.4 mm is necessary when a foamed sheet (foam sheet) is used as the buffer material. Therefore, in the present embodiment, the above calculated value is set to 0.6 mm in order to provide a margin. On the contrary, when this thickness greatly exceeds 0.6 mm, for example, when it is 0.8 mm or more, the thermal conductivity is impaired, which causes a problem.
[0073]
The thickness of the cushioning material should be changed according to the size of the panel, but there are also differences in cooling effect (larger panels have greater spatial tolerance in the housing and less average temperature rise), 40 or more This value can also be applied to other PDP devices.
[0074]
The acrylic foam sheet is used because it is easy to obtain, has heat resistance and weather resistance in addition to the above-mentioned buffering properties, and can obtain a relatively high thermal conductivity without significantly impairing the buffering properties. It is.
[0075]
<A-7. About the shape of double-sided PSA sheet>
In the double-sided pressure-sensitive adhesive sheet 31, the shape, particularly the width dimension is important. That is, in the present embodiment, a tape-like sheet having a width of 150 mm is used. However, when this type of foam sheet exceeds 300 mm, it accumulates between the objects to be bonded (here, panels) when the sheet is attached. Air bubbles may be difficult to escape. Therefore, in order to attach the entire surface of the panel of the PDP device, it is preferable to divide the tape-like material whose width does not exceed 300 mm into several parts and attach them in a plurality.
[0076]
Moreover, there exists a viewpoint of workability | operativity as a reason which makes the width dimension of the double-sided adhesive sheet 31 300 mm or less. That is, when sticking the double-sided pressure-sensitive adhesive sheet 31, manual work is absolutely necessary to obtain good adhesion to the panel. In particular, automation is difficult when the panel surface has protrusions such as component mounting members described later.
[0077]
For example, when the sheet having a width of 300 mm is taken as an example, the double-sided pressure-sensitive adhesive sheet 31 can be stuck on the panel by first rolling and pressing the center of the width of the double-sided pressure-sensitive adhesive sheet 31 with a roller having a width of about 100 mm. Are performed by sequentially pressing with a roller. At this time, it goes without saying that the force for pressing the roller is within the limit that the panel does not break, and the pressing force needs to be uniform on the roll surface of the roller. That is, since this operation is performed manually, the length of the roller to which the operator can apply a uniform force is naturally determined. For example, if the width of the roller is doubled, the force required for the worker is also doubled, increasing the burden on the worker and making it difficult to treat many products one after another. Therefore, the width dimension of the double-sided pressure-sensitive adhesive sheet 31 cannot be increased without limit.
[0078]
In addition, the bubbles that are once pushed out from the center part of the foam sheet and approach the end part tend to return partly toward the center part when the end part is pressed. When the roller width is small and it is necessary to press over three rows or more, the required number of presses increases geometrically and becomes inefficient. Therefore, the width dimension of the roller cannot be made smaller than necessary.
[0079]
Therefore, it is appropriate to use a roller having a width of about 100 mm when the width of the double-sided pressure-sensitive adhesive sheet 31 is 300 mm, and when the width of the double-sided pressure-sensitive adhesive sheet 31 is 150 mm, the width is about 50 to 60 mm. It can be said that it is appropriate to use a roller.
[0080]
<A-8. About the selection of heat transfer plate>
Next, selection of the heat transfer plate 30 will be described. As a condition required for the heat transfer plate 30, thermal conductivity is important, and if the thickness is too thin, the thermal conductivity is deteriorated. On the other hand, the smaller the amount used, the better. However, when a material mainly composed of aluminum is used for the heat transfer plate 30, not only the above conditions, but also the adhesion over the entire surface with the panel to which it is attached must be ensured.
[0081]
Even if the panel is initially sufficiently flat, it is inevitably deformed to some extent by the heat treatment during the formation of the discharge electrode 10 and the sealing with the sealing member 4, and although it is gentle, irregularities are formed. Also, the heat transfer plate itself is not completely flat. Even if a thick heat transfer plate that is not easily deformed is attached to a non-flat panel, there is a problem in terms of adhesion because it is difficult to deform in accordance with the uneven shape. In particular, in the present invention, attention should be paid to the adhesiveness because the use of a weak adhesive sheet is predicated on the reuse of heat transfer plates and panels. In addition, if the heat transfer plate is thick, not only air bubbles remain on the bonding surface, but if it is pressed forcibly, it may cause damage to the panel.
[0082]
On the contrary, if the heat transfer plate is thin, it is needless to say that the heat conductivity is deteriorated, and there is a possibility that the heat transfer plate is creased during the handling or the attaching operation before the attaching. Such a fold causes a cavity to be generated on the bonding surface. Accordingly, the heat transfer plate is required to have a thickness that does not cause a crease.
[0083]
Moreover, the component attachment member 40 as shown in FIG. This is a member for fixing a relatively lightweight component (such as the circuit board 20 of FIG. 19) necessary for driving the PDP device near the back panel 3. A large and heavy driving component of the PDP device needs to be fixed firmly by providing a dedicated mounting portion as will be described later. However, it is practical to directly fix a lightweight object to the heat transfer plate 30. is there. The attachment means generally uses rivets or screws due to the nature of the material of the heat transfer plate 30.
[0084]
FIG. 5 shows an example in which the rivet 41 is used from the back panel 3 side, but the head of the rivet 41 (the end on the back panel 3 side) naturally adheres to the heat transfer plate 30 and the back panel 3. It must be flat so as not to be damaged, that is, it must have a shape that does not protrude from the surface of the heat transfer plate 30 and must have a suitable strength. For this purpose, the heat transfer plate 30 in which the head of the rivet 41 is embedded requires a corresponding thickness.
[0085]
<A-9. About thickness of heat transfer plate>
Therefore, taking the case where the entire back panel 3 is covered with one corrosion-resistant aluminum alloy plate (JIS code A5052P-H34) as the heat transfer plate 30 as an example, the results of examining the desired plate thickness for each characteristic are listed in FIG. Shown as a table.
[0086]
In FIG. 6, the characteristics required for the heat transfer plate 30 include thermal conductivity, cost, adhesion, possibility of occurrence of folding during handling, possibility of occurrence of folding during peeling work, and availability of rivets and screws. Is shown.
[0087]
And the evaluation with respect to the above-mentioned characteristic is performed in four stages, that is, unusable, barely usable, almost satisfied, and satisfied with the thickness of the heat transfer plate 30 as a parameter. These evaluations are indicated in the table by symbols x, Δ, ○, and ◎, respectively.
[0088]
The adhesion is evaluated when a plate having no bent portion is used, and the possibility of occurrence of crease in the peeling operation is determined on both sides of weak adhesive having a 90-degree peeling adhesive strength of 0.15 kgf / cm. This is an evaluation when an adhesive sheet is used.
[0089]
The selection of the thickness of the heat transfer plate 30 has a problem that the thermal conductivity and the cost are contradictory, but the thermal conductivity of the panel and the heat transfer plate are different by two digits, so even if the heat transfer plate is considerably thin (For example, 0.5 mm) Effective in terms of heat conduction. However, in consideration of other characteristics shown in the table of FIG. 6, 1.0 mm is the best, and 0.7 mm to 1.2 mm is an acceptable range even if the selection range is somewhat widened.
[0090]
Although the case where the entire back panel 3 is covered with one heat transfer plate 30 has been described in the above description, the size of the heat transfer plate 30 is also related to the determining factor of the thickness of the heat transfer plate 30.
[0091]
Here, FIG. 7 shows a configuration in which the entire back panel 3 is covered with one heat transfer plate 30, and FIG. 8 shows a configuration in which the entire back panel 3 is covered with a plurality of heat transfer plates 30. 7 and 8, the tape-like double-sided pressure-sensitive adhesive sheet 31 is adhered to the entire surface of the back panel 3 as described above, and the heat transfer plate 30 is adhered thereon.
[0092]
In FIG. 8, the surface of the back panel 3 is equally divided into four, and the heat transfer plates 30 equal to the area of each part are affixed. The heat transfer plate 30 with a small area is easy to handle and is not easily creased, and is easily adapted to the unevenness with the back panel 3 (deformed according to the uneven shape), so that it adheres securely. Become.
[0093]
Here, what should be taken into account is the increase in the work of pasting by dividing, the influence on the thermal conductivity by dividing, and the unevenness and folds that occur even if the area is divided to reduce the area. When the size in one direction of the heat transfer plate 30 is 300 mm or more, it can be said that the thickness of 0.7 to 1.2 mm described above is appropriate.
[0094]
Further, from the possibility of folding during the handling of the table in FIG. 6 and the possibility of folding during the peeling operation, the corrosion-resistant aluminum alloy (proof strength 0.25 kg / cm²However, aluminum alloys other than corrosion-resistant aluminum alloys (magnesium alloys) are generally less demanding and expensive because they are less demanding.
[0095]
Moreover, there is pure aluminum as a material that can be easily obtained. Although this has a high thermal conductivity, there is a problem that deformation is likely to occur because it is soft and has low yield strength. However, generally speaking, materials with low yield strength and prone to deformation are also well-familiar with irregularities, and small folds can be easily repaired with an appropriate tool when bonding. The influence of the plate thickness on the selection conditions is small. Note that a thin material having a high yield strength, once deformed, still has a springback force even if it is repaired by pressing, and tends to cause partial peeling over a long period of time.
[0096]
<A-10. Characteristic effects>
From the above description, the weak adhesive (P / b = 0.05 to 0.2 kgf / cm) double-sided pressure-sensitive adhesive sheet 31 is pasted over the entire surface of the back panel 3, and a thickness of 0.7 to 1 is provided thereon. .2mm corrosion-resistant aluminum alloy (magnesium alloy) heat transfer plate 30 is attached to cool the PDP in operation by static cooling means, and eliminate the temperature difference that occurs on the panel surface. Thus, it can be said that the manufacturing cost can be suppressed and the recovery cost can be reduced.
[0097]
<B. Second Embodiment>
In Embodiment 1 which concerns on this invention demonstrated above, although the structure which sticks the heat exchanger plate 30 to the back panel 3 was shown, it is good also as a structure which sticks the heat exchanger plate 30 to the front panel 2. FIG.
[0098]
FIG. 9 shows a partial sectional view of a PDP 200 as a second embodiment of the PDP apparatus according to the present invention. The PDP 200 is a so-called 40-type PDP having a diagonal size of 40 inches, and FIG. 9 is a partial cross-sectional view of an edge portion thereof.
[0099]
In FIG. 9, the heat transfer plate 30 is affixed to the edge of the front panel 2. Since the front panel 2 is on the image display side, the range where the heat transfer plate 30 can be attached is limited to the outside of the effective portion boundary 5A (the virtual outer peripheral contour line of the effective portion 5 which is the image display portion). It is effective in eliminating unevenness due to location.
[0100]
In particular, the front overhang portion 2A (the portion where the front panel 2 protrudes from the back panel 3) is a portion that does not generate heat, and since it protrudes over the back panel 3, the temperature rise is small and tensile strain is likely to occur. Cracks often occur. Therefore, the heat transfer plate 30 is attached to the end edge of the front panel 2, that is, outside the virtual outer peripheral contour line, and the heat of the effective portion 5 near the effective portion boundary 5A is transmitted by the heat transfer plate 30, thereby The temperature of the overhang portion 2A can be increased.
[0101]
Even in this case, the criteria described in the first embodiment can be applied to the selection of materials for the heat transfer plate 30 and the double-sided pressure-sensitive adhesive sheet 31.
[0102]
Needless to say, the heat transfer plate 30 may be attached not only to the front panel 2 but also to the entire surface of the back panel 3.
[0103]
<C. Embodiment 3>
<C-1. Device configuration>
Next, as a third embodiment according to the present invention, a place where a configuration for fixing an accessory device such as a circuit board or a forced air cooling device arranged on the back panel side is provided, or a PDP to which these accessory devices are attached A specific structure of the heat transfer plate that secures a place for providing a configuration for attaching the display device to the housing of the display device will be described.
[0104]
FIG. 10 shows a partial perspective view of a PDP 300 in which a heat transfer plate 301 is attached to the back panel 3 with a double-sided adhesive sheet 31. In FIG. 10, the heat transfer plate 301 is provided with an opening 32. The opening 32 has a square shape with a size of 65 mm × 65 mm, for example, and the load holding plate 33 made of an aluminum alloy plate similar to the opening 32 is provided on the back panel 3 exposed in this portion. 32 is affixed and fixed with a double-sided pressure-sensitive adhesive sheet 34 (second double-sided pressure-sensitive adhesive sheet) having a similar shape to that of 32. The size of the load holding plate 33 and the double-sided pressure-sensitive adhesive sheet 34 for buffering is smaller than that of the opening 32, for example, a square shape of 60 mm × 60 mm.
[0105]
Since the back panel 3 made of glass is a relatively solid structure, circuit boards for operation of the PDP can be fixed to the panel itself. That is, the PDP 300 is first attached to the housing of the PDP device, and circuit boards are attached thereto. For this purpose, a reliable connection between the casing and the PDP 300 and means for securely holding the circuit boards on the PDP 300 (hereinafter referred to as “load holding”) are required.
[0106]
However, if the relatively thin heat transfer plate 30 is attached to the back panel 3 that should be the main body of the load with the weak adhesive double-sided pressure-sensitive adhesive sheet 31 as described above, it is difficult to hold the load. . The component mounting member 40 and the like described with reference to FIG. 5 can withstand only a very light load.
[0107]
Therefore, as shown in FIG. 10, the heat transfer plate 30 is provided with an opening 32 (may be cut), and a special structural member is provided there independently of the heat transfer plate 30. A structure that can withstand a load that cannot be withstood can be obtained.
[0108]
The double-sided pressure-sensitive adhesive sheet 34 is composed of an acrylic foam sheet having a thickness of 1.3 mm, and both surfaces thereof have a stronger shear holding force than the double-sided pressure-sensitive adhesive sheet 31. This strength will be described later.
[0109]
<C-2. Load holding plate configuration>
A load holding stud 35 made of a prismatic metal material having a square shape with a cross section of 12 mm × 12 mm is attached to the center of the load holding plate 33 by caulking or welding. The load holding stud 35 is provided with a means for engagement such as a screw hole 36, and is relatively large, such as attaching the PDP 300 itself to the casing or holding a circuit board for operating the PDP 300. The structure can support the load. The thickness of the load holding plate 33 is thicker than that of the heat transfer plate 301 due to the attachment of the load holding stud 35. The load holding plate 33 and the load holding stud 35 can be collectively referred to as a load holding tool.
[0110]
In addition, since the opening part 32 is provided partially, the function of cooling and heat transfer of the heat exchanger plate 30 is not impaired.
[0111]
In addition, a static weight load is usually applied to the load holding plate 33, but an impact load that is considerably larger than the static load may be temporarily applied during transportation and handling of the entire PDP device. There is a need for a cushioning material that mitigates impact loads. Therefore, the double-sided pressure-sensitive adhesive sheet 34 must have a stronger adhesive force than the double-sided pressure-sensitive adhesive sheet 31, and must be thicker than the double-sided pressure-sensitive adhesive sheet 31 in order to enhance buffering properties.
[0112]
<C-3. About collection work of load holding plate>
In addition, since the load holding plate 33 is a relatively thick plate, if it is too large in area, there is a problem of adhesiveness (problem with the unevenness). However, this problem is that the adhesive force of the double-sided PSA sheet 34 is strong and the buffering property (thickness) is large, so it is difficult to determine the upper limit of the size, and the load holding plate 33 is attached to the back panel 3. After that, for example, when the panel is determined to be defective, the condition from the viewpoint of workability of the operation of collecting the load holding plate 33 becomes a larger limiting factor. In addition, the collection | recovery operation | work of the load holding board 33 is an important operation | work from the point of a waste separation.
[0113]
Here, the collection | recovery operation | work of the load holding board 33 is demonstrated. As a method of peeling off the load holding plate 33 from the back panel 3, there is a method of piling a flat jig such as the tip of a driver into the bonding portion. However, this method damages the back panel 3 and is not practical from the viewpoint of reuse.
[0114]
As a result of experiments, it was found that a method of applying a shearing force to the bonding surface is good for peeling glass (ie, a panel) that is weak against local stress in a short time without breaking. Specifically, the shear force is applied by rotating the load holding plate 33 in the plane.
[0115]
A specific method for rotating the load holding plate 33 in-plane will be described with reference to FIGS. 11 and 12. 11 and 12, it is assumed that the double-sided pressure-sensitive adhesive sheet 34 is affixed to the back panel 3 (not shown).
[0116]
As shown in FIG. 11, a rotational moment is applied by holding the load holding stud 35 with a rotating jig 50 such as a spanner and rotating the rotating jig 50 in the plane. In this manner, the load holding stud 35 can be used as a gripping grip when peeling off, and preferably has a prismatic shape (quadrangular prism or hexagonal prism) so that it can be rotated by a general spanner or the like.
[0117]
Further, the load holding stud 35 is preferably applied with a rotational moment at the time of peeling off around the center of the load holding plate 33 because the load is uniformly applied to the entire load holding plate 33, and therefore the load holding plate 33 is loaded. Near the center of
[0118]
Further, the rotational moment can be obtained by directly rotating the load holding plate 33 without holding the load holding stud 35 and turning it. For this purpose, as shown in FIG. 12, a notch portion 37 is provided at the edge of the load holding plate 33, and a dedicated rotating jig 60 having a claw portion 61 that can be inserted into the notch portion 37 is used. .
[0119]
The dedicated rotating jig 60 includes a stud engaging portion 62 that engages so as to grip the load holding stud 35, and a claw portion 61 that is inserted into the cutout portion 37 of the load holding plate 33. When removing 33, the stud engaging portion 62 is engaged with the load holding stud 35, the claw portion 61 is inserted into the cutout portion 37, and the cutout portion 37 is hooked by the claw portion 61 with the load holding stud 35 as a fulcrum. Rotate in the state. If the load holding stud 35 is provided, the purpose can be achieved by providing the notch 37 at only one place.
[0120]
Instead of the cutout portion 37, a hole or a projection may be provided, and the removal may be performed with a dedicated rotating jig suitable for the hole or projection. However, it is not preferable to grip and rotate only the outer peripheral portion of the load holding plate 33 because it causes damage to the glass when the tool slides.
[0121]
<C-4. Shear adhesion test method>
As an index for quantitatively determining the conditions for in-plane rotation of the load holding plate 33, a shear adhesive force can be cited. The shear adhesive strength test method will be described below with reference to FIG.
[0122]
In FIG. 13, the adhesive sheet sample 103 for measuring the shear adhesive force is bonded so that one ends of the test plates 104A and 104B face each other. Here, the test plates 104A and 104B are made of the same material as the member to which the double-sided adhesive sheet 34 is attached in the PDP apparatus.
[0123]
The measurement of the shear adhesive strength is performed by adhering the test plates 104A and 104B with the adhesive sheet sample 103 having a length L × width W (typically 2.5 cm × 2.5 cm) and then the other ends of the test plates 104A and 104B. Pulling (in the side where the adhesive sheet sample 103 is not attached) in opposite directions at a rate of 300 mm per minute while paying attention to parallelism. The shear adhesive force is obtained by dividing the force when the adhesive surface is peeled by the area of the sample (L × W).
[0124]
For accurate measurement, it is necessary to specify the initial crimping method and the like in detail, but for these, the method specified in JIS Z0237 is used. However, in the above JIS standard, the length of the material to be tested (adhesive sheet) is kept constant, and the result is expressed by the required force per unit width, and the object to be bonded is specified in the test. However, in the following description, the result is expressed as a required force per unit area, and the test is performed using a material related to the present invention as an adherend.
[0125]
When the load holding plate 33 is circular for simplification, the maximum shear stress τ generated in the bonded portion with respect to the rotational moment applied is τ = 16 M / πD.^ThreeIt can be calculated with Here, D is the diameter of the bonded portion, and M is the rotational moment to be applied.
[0126]
In order to conform to the present embodiment, when the bonding portion diameter D is 6 cm and the rotation moment M is 500 kg · cm, the maximum value of about 12 kg / cm from the above equation to the bonding surface.²It can be seen that the shear stress is generated. Therefore, the load holding plate 33 is usually a double-sided pressure-sensitive adhesive sheet that can be easily obtained (8 kg / cm as a representative value of shear adhesive strength).²) Can be easily peeled off.
[0127]
Unlike the heat transfer plate 30, the double-sided PSA sheet 34 used here has a sufficiently strong shear holding force (the force that the relative positional relationship between the adherends exceeds the elastic limit even when a load is applied). )is required. The shear holding force is closely related to the shear adhesive force handled here.
[0128]
Accordingly, a certain level of strength is required as the shear adhesive strength, but as this minimum value, a linear adhesive strength of 4 kg / cm²Is assumed.
[0129]
Shear adhesive strength 4 kg / cm²Then, in order to easily peel off by the method described with reference to FIGS. 11 and 12, 4 kg / cm²1.2 times that of 4.8kg / cm²It is necessary to apply a maximum shear stress of a certain degree.
[0130]
Therefore, the maximum shear stress is 4.8 kg / cm.²When the load holding plate 33 is circular, the applied torque is 500 kg · cm, and the limit of the peelable diameter is obtained from the above-described equation for obtaining the maximum shear stress τ, D = 8.1 cm is obtained. That is, it can be said that the load holding plate 33 having a diameter of 8 cm can be peeled off (twisted) even if the shear adhesive force is relatively small. Therefore, the area of the load holding plate 33 should be within 8 cm × 8 cm at most. The size of the load holding plate 33 described with reference to FIG. 10 falls within this range.
[0131]
Here, if the reuse of the peeled load holding plate 33 is considered, the shear adhesive force of the double-sided pressure-sensitive adhesive sheet 34 may be stronger on the load holding plate 33 than on the back panel 3. That is, when a defective product is generated in the PDP and the load holding plate 33 needs to be peeled off, if the double-sided pressure-sensitive adhesive sheet 34 is left on the load holding plate 33, the subsequent processing becomes simple. This is because the load holding plate 33 enables heating, use of a solvent, use of a special tool, and the like when the double-sided pressure-sensitive adhesive sheet 34 is removed. If the double-sided PSA sheet 34 remains on the glass side, the panel may be damaged during the removal operation.
[0132]
In addition, about the double-sided adhesive sheet 31 used for affixing the heat exchanger plate 30 demonstrated previously, the adhesive force was evaluated by peeling 90 degree | times, but the double-sided adhesive sheet 34 used for the load holding board 33 was peeled off. The shear adhesion strength is evaluated in relation to the method.
[0133]
If both (the double-sided pressure-sensitive adhesive sheet 31 and the double-sided pressure-sensitive adhesive sheet 34) are compared from the standpoint of adhesiveness retention, they should be compared in terms of shear retention force. However, since there is a correlation between the shear holding force and the shear adhesive force, it can be said that the double-sided adhesive sheet 34 naturally has a greater shear adhesive force than the double-sided adhesive sheet 31.
[0134]
Moreover, since the load holding plate 33 is originally attached to a position that should be covered with the heat transfer plate 30, it is desirable that the load holding plate 33 itself has heat transfer properties and heat dissipation properties. Therefore, from the viewpoint of heat dissipation, a metal material having as good thermal conductivity as possible is selected for the load holding plate 33, and a structure that increases the surface area for heat dissipation, such as the load holding stud 35, is attached.
[0135]
<D. Embodiment 4>
<D-1. Basic configuration>
In Embodiment 2 which concerns on this invention demonstrated previously, the heat exchanger plate 30 is affixed on the outer edge of the edge part of the front panel 2, ie, virtual outer periphery outline, and the effective part 5 of the vicinity of the effective part boundary 5A of The configuration for increasing the temperature of the front overhanging portion 2A by transferring heat by the heat transfer plate 30 has been described. However, the configuration described below may be adopted in order to increase the temperature rising effect of the front overhanging portion 2A. .
[0136]
FIG. 14 is a partial cross-sectional view of a PDP 400 as a fourth embodiment of the PDP device according to the present invention. In FIG. 14, the heat transfer plate 302 affixed to the back panel 3 extends so as to face the front projecting portion 2 </ b> A that is an end edge portion of the front panel 2. This portion is referred to as a facing portion 30A.
[0137]
The space defined by the front projecting portion 2 </ b> A, the facing portion 30 </ b> A, and the end surface of the back panel 3 is filled with a heat conductive material 38. The heat conducting material 38 is a soft electrically insulating material such as a gel or cream like silicone resin. This material is provided so as to cover the FPC 11 and the conductive foil 11A at a certain portion.
[0138]
As described above, when thermal destruction occurs in the PDP in operation, there is a tendency to occur from the overhanging portion (the front overhanging portion 2A in this example). This is because there is no heat generation in the overhanging part and it is only cooled, so that tensile strain is likely to occur here due to the temperature gradient, and the glass end face is susceptible to small scratches due to cutting or contact during work, This is because it tends to be a crack source.
[0139]
However, in the PDP 400 shown in FIG. 14, the heat generated in the effective portion 5 inside the effective portion boundary 5 </ b> A (including heat generated not only in the front panel 2 but also in the back panel 3) is transmitted through the heat conductive material 38 to the front projecting portion 2 </ b> A. Since the tensile strain can be reduced by increasing the temperature of this portion, it is possible to prevent thermal destruction from occurring from the front projecting portion 2A.
[0140]
<D-2. Modification 1>
In the PDP 400 described above, the configuration in which the heat generated by the heat conductive material 38 in the front panel 2 and the back panel 3 is transmitted to the front projecting portion 2A is shown. However, the heat conductivity of the heat conductive material 38 is a metal heat transfer plate. Smaller than 302.
[0141]
Therefore, as in the PDP 500 shown in FIG. 15, by providing a step 30B so as to shorten the distance between the facing portion 30A and the front projecting portion 2A, the thermal resistance between the facing portion 30A and the front projecting portion 2A is reduced. You may make it let it.
[0142]
Further, as shown in FIG. 15, the heat transferred from the effective portion boundary 5 </ b> A through the heat transfer plate 302 to the outside by sticking the heat insulating material 39 to the outer surface of the facing portion 30 </ b> A (the side not facing the front projecting portion 2 </ b> A). Dissipation can be suppressed, the gradient of the temperature distribution can be reduced, and the thermal strain generated in the front projecting portion 2A can be reduced.
[0143]
The heat insulating material 39 is made of, for example, a sponge-like foamed resin having a thickness of about 10 mm, and is bonded with the adhesive AH from the outer surface of the facing portion 30A to the heat transfer plate 30 outside the effective portion boundary 5A.
[0144]
<D-3. Modification 2>
Further, as a configuration for shortening the interval between the facing portion 30A and the front projecting portion 2A, as in the PDP 600 shown in FIG. 15, the facing portion 30A is bent in a direction approaching the front projecting portion 2A to provide an inclination 30C. Also good.
[0145]
<D-4. Modification 3>
In the above description, it is assumed that the heat transfer plate 30 is attached to the back panel 3. However, the heat transfer plate 302 is attached to the edge of the front panel 2, that is, outside the virtual outer peripheral contour line. Even in this case, the same effect can be obtained. That is, like the PDP 700 shown in FIG. 17, the heat transfer plate 303 is pasted outside the virtual outer peripheral contour line 5 </ b> A of the front panel 2. In this case, a portion of the heat transfer plate 303 that extends so as to face the back overhanging portion 3A that is an edge of the back panel 3 is the facing portion 30A.
[0146]
And it is the same as that of PDP apparatus 400-600 demonstrated until now that the heat conductive substance 38 is filled between 3 A of back protrusion parts, and the opposing part 30A.
[0147]
Further, as described in the first modification, the heat insulating material 39 may be attached to the outer surface of the facing portion 30A (the side not facing the back overhang portion 3A).
[0148]
Needless to say, Embodiments 1 to 4 described above may be used in combination.
[0149]
【The invention's effect】
  The present inventionRupuAccording to the laser display panel device, the main surface of the back panel that does not face the front panelOn both sidesBecause it has a heat transfer plate with heat conductivity attached using an adhesive sheet, the plasma display panel device in operation is cooled by static cooling means, and the temperature difference generated on the panel surface is eliminated. Thus, thermal distortion can be effectively eliminated. Also, LegendSeparation of the heat plate and the back panel is easy, and the back panel and the heat transfer plate are prevented from being damaged, so that the manufacturing cost can be suppressed and the recovery cost can be reduced.
[0150]
  The present inventionRupuAccording to the plasma display panel device, it is possible to reliably prevent damage to the back panel and the heat transfer plate when separating the heat transfer plate and the back panel.
[0152]
  The present inventionRupuAccording to the laser display panel device, in addition to the function as a cushioning material, it is easy to obtain, has heat resistance and weather resistance, and has a relatively high thermal conductivity without impairing the function as a cushioning material. And the back panel can be reliably prevented from being damaged.
[0153]
  The present inventionRupuAccording to the laser display panel device, the tape-shapedDouble-sided adhesive sheetIn the sticking area of the heat transfer plate, it is divided into a plurality of parts and attached to the back panel.If the tape width is set appropriately, air bubbles accumulated between the double-sided adhesive sheet and the back panel when the double-sided adhesive sheet is attached. Can be reliably removed, and it is possible to prevent a burden on the operator who performs the pressing operation when the double-sided pressure-sensitive adhesive sheet is stuck.
[0154]
  The present inventionRupuAccording to the Razma display panel device,Provided with a plurality of load holding plates affixed to the main surface of the back panel independently of the heat transfer plateThe loadBoardCan be used to fix the plasma display panel to the casing of the plasma display panel apparatus, and the space in the casing of the plasma display panel apparatus can be used effectively. If a circuit board for operating the plasma display panel is also attached, the space in the housing can be used more effectively and the assembly work can be facilitated.
[0155]
  The present inventionRupuAccording to the Razma display panel device,Adhesive force to affix the load holding plate to the back panel and a heat transfer plate to the back panelBy making it stronger than the adhesive force, the load of the plasma display panel can be reliably held.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view illustrating a configuration of a plasma display panel according to a first embodiment of the present invention.
FIG. 2 is a perspective view for explaining the measurement principle of 90-degree peel adhesive strength.
FIG. 3 is a perspective view for explaining a measurement model of 90-degree peel adhesive strength.
FIG. 4 is a schematic view showing a state where the double-sided pressure-sensitive adhesive sheet has received a shearing force.
FIG. 5 is a view showing an example of a state in which a component attachment member is attached to a heat transfer plate.
FIG. 6 is a diagram showing the results of investigating the thickness of a material suitable for a heat transfer plate.
FIG. 7 is a plan view showing an example in which the entire back panel is covered with a single heat transfer plate.
FIG. 8 is a plan view showing an example in which the entire back panel is covered with a plurality of heat transfer plates.
FIG. 9 is a cross-sectional view illustrating a configuration of a plasma display panel according to a second embodiment of the present invention.
FIG. 10 is a perspective view illustrating a configuration of a plasma display panel according to a third embodiment of the present invention.
FIG. 11 is a perspective view for explaining a method of rotating the load holder in the plane.
FIG. 12 is a perspective view for explaining a method of rotating the load holder in the surface.
FIG. 13 is a diagram for explaining a test method of shear adhesive strength.
FIG. 14 is a cross-sectional view illustrating a configuration of a plasma display panel according to a fourth embodiment of the present invention.
FIG. 15 is a cross-sectional view illustrating a configuration of a modified example of the plasma display panel according to the fourth embodiment of the present invention.
FIG. 16 is a cross-sectional view illustrating a configuration of a modified example of the plasma display panel according to the fourth embodiment of the present invention.
FIG. 17 is a cross-sectional view illustrating a configuration of a modified example of the plasma display panel according to the fourth embodiment of the present invention.
FIG. 18 is a plan view showing a configuration of a general plasma display panel.
FIG. 19 is a cross-sectional view showing a configuration of a general plasma display panel.
[Explanation of symbols]
2 Front panel, 3 back panel, 30, 301, 302, 303 Heat transfer plate, 31, 34 Double-sided adhesive sheet, 32 Opening, 33 Load holding plate, 35 Load holding stud, 38 Thermal conductive material, 39 Thermal insulation, 30A Opposing part, 30B step, 30C inclination, 2A front projecting part, 3A back projecting part.

Claims (7)

A front panel composed of a glass plate having a certain thickness, through which an image is transmitted,
A back panel composed of a glass plate having a certain thickness arranged facing the front panel;
A heat transfer plate having thermal conductivity affixed using a double-sided pressure-sensitive adhesive sheet on at least the main surface of the back panel that does not face the front panel;
The plasma display panel device has an adhesive strength of at least one side of the double-sided pressure-sensitive adhesive sheet in a range of 0.05 kgf / cm to 0.2 kgf / cm in the test method described in JIS Z0237 when defined by a 90-degree peel adhesive strength. .   2. The plasma display panel device according to claim 1, wherein the heat transfer plate is made of aluminum having a thickness in a range of 0.7 mm to 1.2 mm or an aluminum alloy containing aluminum as a main component. A front panel composed of a glass plate having a certain thickness, through which an image is transmitted,
A back panel composed of a glass plate having a certain thickness arranged facing the front panel;
A heat transfer plate having thermal conductivity affixed to at least a main surface of the back panel that does not face the front panel;
Wherein the main surface of the back panel, and a load weight holding plate affixed independently of the heat transfer plate,
Before yn The heavy holding plate, before SL front panel, wherein the can take a load of a plasma display panel including the back panel and the heat transfer plate, a plasma display panel device. The plasma display panel according to claim 3, wherein a shear adhesive force per unit area for attaching the load holding plate to the back panel is stronger than a shear adhesive force per unit area for attaching the heat transfer plate to the back panel. apparatus. Before SL double-sided pressure-sensitive adhesive sheet is a tape-like sheet, the sticking area of the heat transfer plate, characterized in that it is affixed to the back panel is divided into a plurality, a plasma display panel device of claim 1, wherein .   The plasma display panel device according to claim 5, wherein the double-sided pressure-sensitive adhesive sheet is an acrylic foam sheet.   The plasma display panel device according to claim 6, wherein the double-sided pressure-sensitive adhesive sheet is a tape-like sheet whose width does not exceed 300 mm.

Images