JP3716489B2 - Display device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a display device, and more particularly to a display device in which an electromagnetic wave shielding or optical plate filter is attached to the front surface of a plasma display panel with good heat dissipation.
[0002]
In recent years, display devices, particularly plasma display panels (PDPs), have increased display screen contrast, flickering, reflection of light from the outside, and harmful effects on electronic devices due to large display and color display. Configuration to prevent the display characteristics from deteriorating due to the temperature of the PDP itself due to the attachment of various filters when adding various plate filters for realizing a comfortable and clear screen that can be easily viewed by removing light, electromagnetic waves, etc. Is desired.
[0003]
[Prior art]
An example of a display device using a conventional PDP is shown in the cross-sectional side view of the main part of FIG. 7, and a PDP 1 provided with a drive circuit 2 on the back side is provided with a plurality of heat-dissipating parts on the lower and upper parts of the back plate. Are fixed to the support portion 3a of the front frame by screws 5 in the housing case 3 provided with the vent holes 4.
[0004]
The generated heat from the PDP 1 and the drive circuit 2 at the time of discharge display is dissipated to the outside through the plurality of vent holes 4 for heat release of the housing case 3.
[0005]
[Problems to be solved by the invention]
By the way, in the display device as described above, various methods are used to prevent the contrast of the display surface of the PDP 1 from being improved, the reflection of light from the outside to the display surface, and the emission of light or electromagnetic waves that are harmful to electronic devices. A plate-shaped filter may be added.
[0006]
However, since the PDP 1 is displayed by generating plasma discharge at the time of display, the temperature of the main body of the PDP 1 is relatively high at about 60 to 80 ° C. When the plate-like filter described above is directly added to the front glass 1a of such a PDP 1, a heat insulating effect is generated by the air confined in the gap between the front glass 1a of the PDP 1 and the plate-like filter.
[0007]
For this reason, the heat radiation action from the front glass 1a is lost, and the temperature of the PDP 1 main body further rises by about 10 to 20 ° C. and reaches about 70 to 90 ° C. When the PDP 1 is in the color display format, Xe gas or the like is slightly added to the discharge gas, so that the temperature of the PDP main body at the time of display is several tens of degrees C. than that of the general monochrome type PDP described above. There is a problem that the display characteristics are increased due to the temperature rise.
[0008]
As a result, there is a drawback that not only the life of the PDP 1 is shortened, but also the drive circuit 2 attached to the rear surface of the PDP 1 may be overheated to cause damage.
[0009]
Therefore, in order to solve such a problem, as the front glass of the PDP 1, (1) for example, a glass filter itself for improving contrast, preventing reflection of light from outside, or shielding electromagnetic waves is applied.
[0010]
(2) A material having a filter effect is mixed with a low melting point glass and a solvent on the surface of the glass plate serving as the front glass, and the dispersed paste is applied by screen printing, spin coating, etc. A glass plate integrally provided with a baked glass filter layer, or a material having the effect of the filter mixed with an epoxy resin or a photo-curing resin and a solvent, and a dispersed paste is screen-printed, spin-coated, etc. It is conceivable to apply a glass plate or the like on which a resin filter layer is integrally formed by applying, drying and curing by the above.
[0011]
However, when the front glass integrated with the filter as described above is applied, the conventional heat insulation effect due to air confinement is eliminated and the temperature rise of the PDP 1 is reduced, but on the other hand, the manufacturing process and handling of the PDP 1 are reduced. There is a problem that not only becomes complicated, but also the cost increases.
[0012]
Furthermore, in the PDP in which the resin filter layer is integrally provided on the front glass, there is a problem relating to durability that the resin filter layer may be peeled off after long-term use.
[0013]
In view of the above-described conventional problems, the present invention provides a plate-like filter for improving the contrast added to the front glass of the PDP, for preventing reflection of light from the outside, or for shielding electromagnetic waves, and the like. An object of the present invention is to provide a novel display device that has a structure that is arranged through an interval in which ventilation by discharge is effectively performed and prevents the temperature of the PDP itself from rising even if the plate filter is attached. It is.
[0014]
[Means for Solving the Problems]
In order to achieve the above-described object, the present invention provides an optical plate-like filter disposed on the front surface of a plasma display panel housed in a housing with a gap for air circulation, and the air on the lower surface of the housing. Rutotomoni the vent hole is provided at a position facing the flow for the gap, a structure in which a vent hole in the upper surface of the housing.
[0015]
In such a configuration, the air heated by the rise in the panel temperature inevitably moves upward through the gap and is discharged to the outside through the circulation hole provided in the upper part of the housing case. Inside, air at a low temperature outside from the flow hole provided in the lower part of the housing case flows, and as a result, the ventilation action works, so that it is possible to effectively prevent the temperature of the PDP itself from rising.
[0016]
Further, a cooling fan is provided in communication with at least the air outflow portion at the upper part of the air circulation gap in the housing case, and the air heated in the gap is operated by operating the cooling fan. While being able to forcibly be discharged out of the gap, the ventilation action becomes strong, so that hot air dissipated from the PDP can be released very effectively, and the temperature rise of the PDP itself can be prevented.
[0017]
Accordingly, it is possible to prevent deterioration of display characteristics (such as luminance) due to the temperature rise of the panel, promotion of life deterioration due to thermal distortion of the panel, damage due to overheating of the drive circuit, and the like.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment of a display device using the PDP of the present invention will be described below in detail with reference to the drawings.
[0019]
FIG. 1 is a cross-sectional side view of a main part showing a first embodiment of a display device using a PDP according to the present invention. Parts having the same functions as those in FIG.
In the present embodiment, as shown in the figure, the contrast is improved in the support portion 3a of the front frame of the housing case 3 provided with the vent holes 4 for heat release in the lower and upper portions of the back plate in the horizontal direction as in the conventional example. In addition, a plate-like functional filter 11 for preventing reflection of light from the outside or the like for optical or electromagnetic wave shielding is fitted and fixed.
[0020]
The PDP 1 provided with the drive circuit 2 on the back has an interval of 0.5 to 10 mm between the housing case 3 and the functional filter 11 so that the air heated by the rise in the panel temperature is most easily moved upward. In this embodiment, for example, the air flow gap 12 which is narrowed to an interval of 5 mm to provide an air flow gap 12 is fixed to the back plate by screws 5.
[0021]
In addition, in the storage case 3, air flows to the outside in the regions of the lower plate and the upper plate of the storage case 3 corresponding to the air flow gap 12 between the functional filter 11 and the front glass 1a of the PDP 1, respectively. A plurality of ventilation holes 13 for use and for releasing hot air are provided.
[0022]
When the functional filter 11 is for electromagnetic wave shielding and needs to be grounded, it is grounded using a ground wiring (not shown) provided in the housing case 3 or directly grounded.
[0023]
The vent holes 4 and 13 for air inflow / outflow provided in the housing case 3 can adopt round holes, horizontally long holes, horizontally long holes with a louver, or mesh holes. The air vents 4 and 13 on the air discharge side of the plate are preferably provided with dustproof armor plates, and the air holes 4 and 13 on the air inflow side of the lower plate are preferably provided with a dustproof air filter.
[0024]
With the configuration of such an embodiment, even if the temperature of the PDP 1 body at the time of discharge display rises, the air warmed in the gap 12 between the PDP 1 and the functional filter 11 moves upward and moves upward. Corresponding to 12, the air is efficiently discharged to the outside through a plurality of vent holes 13 provided on the upper plate of the housing case 3.
[0025]
On the other hand, external air flows into the gap 12 through a plurality of ventilation holes 13 provided in the lower plate of the housing case 3 corresponding to the gap 12, and the ventilation function is activated. Since the heat insulation effect due to air confinement does not occur in the gap, the temperature rise of the PDP 1 itself can be effectively prevented.
[0026]
FIG. 2 is a cross-sectional side view of an essential part showing a second embodiment of the display device using the PDP according to the present invention, and parts having the same functions as those in FIG.
This embodiment differs from the first embodiment shown in FIG. 1 in that vent holes 4 provided laterally on the lower and upper portions of the back plate of the housing case 3 are provided on the housing case 3 as shown in the figure. That is, the lower plate and the upper plate are provided so as to follow the vent hole 13 for the gap 12.
[0027]
According to such a configuration, the ventilation action on the drive circuit 2 side as well as the ventilation action in the air circulation gap 12 of the housing case 3 is improved, and the PDP 1 is better than the first embodiment of FIG. It becomes possible to more effectively prevent its own temperature rise.
[0028]
FIG. 3 is a cross-sectional side view of an essential part showing a third embodiment of the display device using the PDP according to the present invention. Parts having the same functions as those in FIG.
The present embodiment differs from the embodiments shown in FIGS. 1 and 2 in that a PDP 1 having a drive circuit 2 attached to the back is provided on an intermediate support portion 3b provided along the inner wall surface in the housing case 3. The housing 6 is fixed by screws 6 and the inside of the housing case 3 is divided into two compartments on the air flow gap 12 side and the drive circuit 2 side as shown in the figure.
[0029]
By adopting the configuration of this embodiment, the ventilation action in the air circulation gap 12 is improved, and the temperature rise of the PDP 1 itself is more effectively prevented than in the embodiment of FIGS. Is possible.
[0030]
FIG. 4 is a side sectional view of an essential part showing a fourth embodiment of a display device using a PDP according to the present invention. Parts having the same functions as those in FIG.
This embodiment differs from the third embodiment shown in FIG. 3 in that the air in the gap 12 is forced to the outside instead of the heat release vent hole 13 provided in the upper plate of the housing case 3. And the cooling fan 14 is provided there.
[0031]
According to the configuration of such an embodiment, the air that is heated in the gap 12 between the PDP 1 and the functional filter 11 due to the temperature rise of the PDP 1 body during discharge display and moves upward as an ascending current is the cooling fan. 14 can be forcibly discharged to the outside, so that external air rapidly flows into the gap 12 from the plurality of vent holes 13 provided in the lower plate of the housing case 3 corresponding to the gap 12. Efficient ventilation is performed, and it is possible to extremely effectively prevent the temperature rise of the PDP 1 itself without causing a heat insulation effect due to air confinement in the gap 12 between the PDP 1 and the functional filter 11.
[0032]
FIG. 5 is a cross-sectional side view of an essential part showing a fifth embodiment of a display device using a PDP according to the present invention. Parts having the same functions as those in FIG.
2 is different from the second embodiment shown in FIG. 2 in that a plurality of ventilation holes 4 and 13 for inflowing air from the outside are provided only on the lower plate of the housing case 3. An opening window for forcibly discharging the air heated inside at the upper part of the upper plate to the outside and the cooling fan 14 are provided there.
[0033]
Even in the configuration of such an embodiment, the air that is heated in the gap 12 between the functional filter 11 and the PDP 1 and moves upward due to the temperature rise of the PDP 1 main body at the time of discharge display is combined with the air warmed by the drive circuit 2 or the like. The cooling fan 14 can forcibly exhaust the air to the outside.
[0034]
In this embodiment, vent holes 13 and 4 for the gap 12 and the drive circuit 2 are individually provided on the lower plate of the housing case 3, but the present invention is not limited to such an example. For example, a plurality of vent holes may be formed in the entire region of the lower plate of the housing case 3 so as to be shared by them. According to this configuration, the outside air rapidly flows into the gap 12 and around the drive circuit 2 to perform an efficient ventilation function, and the air is trapped in the gap 12 between the PDP 1 and the functional filter 11. It is possible to extremely effectively prevent the temperature rise of the PDP 1 itself without causing a heat insulation effect, as in the embodiment of FIG.
[0035]
6A and 6B are views showing a sixth embodiment of the display device using the PDP according to the present invention, in which FIG. 6A is a side sectional view of an essential part, and FIG. 6B is a plan view. In addition, the same code | symbol is attached | subjected to the part which has a function equivalent to FIG.
[0036]
In this embodiment, as shown in the figure, the front glass 1a of the PDP 1 provided with the drive circuit 2 on the back is shown in the plan view of FIG. 6 (b) at the peripheral edge of the front surface of the front glass 1a. For example, a heat-resistant double-sided adhesive tape with a foam resin with a thickness of 0.5 to 10 mm (Y-4945) 16, which has heat resistance, improves contrast, A plate-like functional filter 11 for preventing reflection or the like for optical or electromagnetic wave shielding is attached.
[0037]
Further, the PDP unit 15 having the functional filter 11 attached to the PDP 1 in this way is attached to the intermediate support portion 17b provided along the inner wall surface in the cabinet 17 in which the dustproof window 20 is fixed to the support portion 17a of the front frame by the screw 6. As shown in the figure, the cabinet 17 is configured as a two-compartment chamber, which is formed between the PDP 1 and the functional filter 11 and has a space 12 for air circulation and a drive circuit 2 side. Yes.
[0038]
Further, the lower plate of the cabinet 17 is provided with a plurality of ventilation holes 18 for allowing air from the outside to flow into positions corresponding to the air flow gaps 12, and the upper plate at positions corresponding to the gaps 12. An opening window for forcibly discharging the air in the gap 12 to the outside and a cooling fan 14 are provided, and the back plate has a lower portion and an upper portion corresponding to the drive circuit 2 and communicates to the outside laterally. Vent holes 19 for inflow and heat release are provided.
[0039]
Therefore, according to the configuration of this embodiment, the PDP unit 15 in which the functional filter 11 is attached to the PDP 1 is reliably protected from dust, and the temperature of the PDP 1 main body during discharge display is the same as in the fourth embodiment of FIG. The air that is heated in the gap 12 between the PDP 1 and the functional filter 11 and moves upward as a rising airflow can be forcibly discharged to the outside by the cooling fan 14.
[0040]
Accordingly, external air rapidly flows into the gap 12 through a plurality of ventilation holes 18 provided in the lower plate of the cabinet 17 corresponding to the gap 12, and the ventilation function is efficiently performed. It is possible to extremely effectively prevent the temperature increase of the PDP 1 itself without causing a heat insulation effect due to air confinement in the gap 12 of the PDP 1.
[0041]
【The invention's effect】
As is apparent from the above description, according to the display device using the plasma display panel (PDP) according to the present invention, the air heated in the gap between the PDP and the plate-like functional filter corresponds to the gap. It is efficiently discharged to the outside by the chimney effect from the outflow part provided in the upper part (upper plate) of the storage case (cabinet etc.) or forcedly discharged by the cooling fan.
[0042]
In addition, since the outside air flows from the air inflow part provided in the lower part (lower plate) of the housing case (cabinet or the like) corresponding to the gap, the ventilation function works, so that the temperature of the PDP itself is extremely increased. It becomes possible to prevent effectively.
[0043]
Accordingly, it is possible to prevent deterioration of display characteristics (luminance, etc.) due to temperature rise of the PDP, promotion of life deterioration due to thermal distortion of the panel, etc., and damage, breakage, etc. due to overheating of the drive circuit. The present invention is extremely advantageous when applied to various display devices provided with a functional filter on the front surface of the PDP, greatly contributes to performance improvement, and has an excellent practical effect.
[Brief description of the drawings]
FIG. 1 is a cross-sectional side view of an essential part showing a first embodiment of a display device using a PDP according to the present invention.
FIG. 2 is a side sectional view of an essential part showing a second embodiment of a display device using a PDP according to the present invention.
FIG. 3 is a side sectional view of an essential part showing a third embodiment of a display device using a PDP according to the present invention.
FIG. 4 is a side sectional view of an essential part showing a fourth embodiment of a display device using a PDP according to the present invention.
FIG. 5 is a cross-sectional side view of an essential part showing a fifth embodiment of a display device using a PDP according to the present invention.
FIGS. 6A and 6B are a side sectional view and a plan view showing a main part of a sixth embodiment of a display device using a PDP according to the present invention.
FIG. 7 is a side sectional view of an essential part showing an example of a display device using a conventional PDP.
[Explanation of symbols]
1 PDP
DESCRIPTION OF SYMBOLS 1a Front glass 2 Drive circuit 3 Housing | casing case 3a, 17a Support part 3b, 17b Intermediate support part 4, 13, 18, 19 Air hole 5, 6 Screw 11 Function filter 12 Gap | interval 14 Cooling fan 15 PDP unit 16 Double-sided adhesive tape 17 Cabinet 20 Dustproof window

Claims (5)

An optical plate-like filter is disposed on the front surface of the plasma display panel accommodated in the casing with a gap for air circulation, and a space communicating with the inside of the casing is provided above and below the air circulation gap. A display device provided with a vent hole at a position facing the air flow gap on the lower surface of the casing, and a vent hole on the upper surface of the casing . An optical plate-like filter is disposed on the front surface of the plasma display panel with a gap for air circulation, and air is provided from the outside at a position facing the air circulation gap on the lower surface of the casing housing the plasma display panel. And a vent hole or opening for allowing air to flow out to the outside on the upper surface of the housing, and through the air flow gap from the vent hole on the lower surface of the housing. Alternatively, a display device characterized by forming an air flow passage leading to the opening. The display device according to claim 2, wherein a cooling fan is provided in a ventilation hole or an opening provided on the upper surface of the housing to make air flow out of the housing stronger. 4. The display device according to claim 2, wherein a driving circuit is attached to the back surface of the plasma display panel, and a gap for air circulation is provided between the driving circuit and the back surface of the housing. A plasma display panel in which a functional filter is integrally provided on the front surface, a housing to which the plasma display panel is attached, and a front cover plate that covers the front surface of the housing, the functional filter of the plasma display panel and the front surface The cover plate is disposed with a gap for air flow, and a vent hole is provided at a position facing the air flow gap on the lower surface of the casing, and a vent hole is provided on the upper surface of the casing. A display device.

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