JP2007086126A - Plasma display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a plasma display device, wherein a noise sound in a pressure reduction area is reduced. <P>SOLUTION: The device includes: a module constituted by holding a plasma display panel 10 having a plurality of discharge cells on the front side of a chassis member 11 and also arranging a circuit board 13 on the back side of the chassis member 11; and housing which contains the module and has a front protection cover 16 arranged on the front side of the plasma display panel 10 and a back cover 17 arranged on the back side of the chassis member 11, wherein an air blowing fan 23 is arranged above the module in the housing, a plurality of air vents are provided above the back cover 17, and a sound insulating member is arranged on an internal surface of the back cover 17 to close air vents which are not at positions corresponding to a blow-out part of the air blowing fan 23. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a plasma display apparatus using a plasma display panel as a display device.

  The plasma display panel used in this plasma display device is roughly classified into an AC type and a DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. At present, the mainstream of plasma display devices is a surface discharge type with a three-electrode structure because of the simplicity of manufacturing and manufacturing.

  In this surface discharge type plasma display panel structure, at least a pair of substrates whose front sides are transparent are arranged to face each other so that a discharge space is formed between the substrates, and partition walls for dividing the discharge space into a plurality of substrates are arranged on the substrate. In addition, a plurality of discharge cells are configured by arranging an electrode group on the substrate so that a discharge is generated in the discharge space partitioned by the barrier ribs, and providing phosphors that emit red, green, and blue light emitted by the discharge. However, phosphors are excited by vacuum ultraviolet light having a short wavelength generated by discharge, and red, green, and blue visible light is emitted from red, green, and blue discharge cells, respectively, to perform color display.

  Such a plasma display device can display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to enlarge, and is self-luminous so that the display quality is high. Recently, the flat panel display has attracted particular attention and is used for various purposes as a display device in a place where many people gather and a display device for enjoying a large screen image at home.

In such a plasma display device, a driving circuit for holding a plasma display panel whose glass is a main material on the front side of a metal-made holding plate such as aluminum and causing the plasma display panel to emit light on the back side of the holding plate. The module is configured by arranging the circuit boards constituting the circuit board (see Patent Document 1).
JP 2003-131580 A

  By the way, in the plasma display panel of this plasma display device, a front glass plate and a rear glass plate are bonded together via a partition wall, and a discharge gas mainly composed of neon is enclosed at about 500 Torr, which is usually large. The surface glass plate is pressed against the partition wall of the rear glass plate by the atmospheric pressure, and when used in an area where the atmospheric pressure is low, particularly in a high altitude, a noise sound due to vibration noise is generated from the plasma display panel.

  The present invention solves such a problem, and an object of the present invention is to reduce noise noise in a decompression area in a plasma display device.

  In order to achieve the above object, the present invention provides a module configured by holding a plasma display panel having a plurality of discharge cells on the front side of a holding plate and arranging a circuit board on the back side of the holding plate, and this module. A housing having a front protective cover that is housed and disposed on the front side of the plasma display panel and a back cover that is disposed on the back side of the holding plate, and blows air to an upper position of the module in the housing And a plurality of ventilation holes at an upper position of the back cover, and a sound insulating material so as to block a ventilation hole at a position other than the position corresponding to the blowing portion of the blower fan on the inner surface of the back cover. It is characterized by arranging.

  According to another aspect of the present invention, there is provided a module configured by holding a plasma display panel having a plurality of discharge cells on the front side of a holding plate and arranging a circuit board on the back side of the holding plate; A housing having a front protective cover disposed on the front side of the display panel and a back cover disposed on the rear side of the holding plate, and a fan for blowing is disposed at an upper position of the module in the housing In addition, a plurality of ventilation holes are arranged at positions corresponding to the blowing portions of the blower fan at the upper position of the back cover.

  ADVANTAGE OF THE INVENTION According to this invention, the noise sound under external air pressure reduction, such as a highland, can be reduced.

  Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 11, but the embodiment of the present invention is not limited thereto.

  First, the structure of the plasma display panel in the plasma display device will be described with reference to FIG. As shown in FIG. 1, on a transparent front substrate 1 such as a glass substrate, a plurality of stripe-shaped display electrodes 2 paired with a scan electrode and a sustain electrode are formed, and covers the electrode group. Thus, the dielectric layer 3 is formed, and the protective film 4 is formed on the dielectric layer 3.

  A plurality of rows of stripes covered with an overcoat layer 6 are formed on the rear substrate 5 opposite to the front substrate 1 so as to intersect the display electrodes 2 of the scan electrodes and the sustain electrodes. The data electrode 7 is formed. On the overcoat layer 6 between the data electrodes 7, a plurality of barrier ribs 8 are arranged in parallel with the data electrodes 7, and a phosphor layer 9 is provided on the side surface between the barrier ribs 8 and on the surface of the overcoat layer 6. Yes.

  The substrate 1 and the substrate 5 are opposed to each other with a minute discharge space so that the display electrode 2 and the data electrode 7 of the scan electrode and the sustain electrode are almost orthogonal to each other, and the periphery is sealed, In the discharge space, one or a mixed gas of helium, neon, argon, and xenon is sealed as a discharge gas. In addition, the discharge space is divided into a plurality of sections by partition walls 8 to provide a plurality of discharge cells in which the intersections of the display electrodes 2 and the data electrodes 7 are located. Each of the discharge cells has red, green and blue colors. The phosphor layers 9 are sequentially arranged one by one so that

  FIG. 2 shows an electrode arrangement of the plasma display panel. As shown in FIG. 2, the scan electrode, the sustain electrode, and the data electrode have a matrix configuration of M rows × N columns, and M rows are arranged in the row direction. Scan electrodes SCN1 to SCNM and sustain electrodes SUS1 to SUSM are arranged, and N columns of data electrodes D1 to DN are arranged in the column direction.

  In the plasma display panel having such an electrode configuration, an address pulse is applied between the data electrode and the scan electrode by applying a write pulse between the data electrode and the scan electrode, and after selecting the discharge cell, the scan electrode By applying a periodic sustain pulse that is alternately inverted between the sustain electrode and the sustain electrode, a sustain discharge is performed between the scan electrode and the sustain electrode, and a predetermined display is performed.

  FIG. 3 is an exploded perspective view showing the overall configuration of the plasma display device according to the embodiment of the present invention incorporating the plasma display panel having the structure described above, and FIG. 4 shows the structure of the main part when cut in the vertical direction. FIG. 5 is a plan view of the module in which the back cover is removed and the internal structure is seen.

  In the figure, reference numeral 10 denotes a plasma display panel having a plurality of discharge cells having the configuration described above. This plasma display panel 10 is a chassis member 11 as a holding plate that also serves as a heat sink formed by forming a flat plate made of aluminum. The heat dissipation sheet 12 (not shown in FIG. 3) is interposed between the plasma display panel 10 and the chassis member 11 and adhered by an adhesive or the like. Further, on the rear surface side of the chassis member 11, a plurality of circuit boards 13 constituting a drive circuit for driving the display of the plasma display panel 10 are arranged, thereby constituting a module.

  The heat dissipation sheet 12 is for adhering and holding the plasma display panel 10 to the front side of the chassis member 11, efficiently transferring the heat generated in the plasma display panel 10 to the chassis member 14, and radiating heat. The thickness is about 1 mm to 2 mm. As this heat radiating sheet 12, an insulating heat radiating sheet in which a synthetic resin material such as acrylic, urethane, silicon resin, or rubber contains a filler that enhances thermal conductivity, a graphite sheet, a metal sheet, or the like can be used. In addition, the heat dissipation sheet itself has an adhesive force, and the plasma display panel 10 is bonded to the chassis member 11 with only the heat dissipation sheet 12 and held, or the heat dissipation sheet 12 has no adhesive force and another double-sided adhesive tape is used. A configuration in which the plasma display panel 10 is bonded to the chassis member 11 can be used.

  Further, a flexible wiring board (not shown) connected to the electrode lead-out portions of the scan electrode and the sustain electrode is provided on both side edges of the plasma display panel 10, and the scan drive circuit and the sustain among the circuit board 13 are provided. The circuit board 13 constituting the drive circuit is connected via a connector. On the other hand, as shown in FIGS. 4 and 5, a plurality of flexible wiring boards 14 connected to the electrode lead portions of the data electrodes are provided on the upper and lower edges of the plasma display panel 10, and the flexible wiring boards are provided. 14 is electrically connected to each of a plurality of data drivers 15 as data electrode driving circuits disposed at the upper and lower positions on the back side of the chassis member 11.

  Further, a boss portion 11 a for attaching the circuit board 13 and the data driver 15 is fixed to the rear surface of the chassis member 11.

  The module is housed in a housing having a front protective cover 16 disposed on the front side of the plasma display panel 10 and a metal back cover 17 disposed on the rear side of the chassis member 11. A plasma display device is completed.

  The front protective cover 16 is attached to the front frame 18 made of resin or metal having an opening 18a through which an image display area on the front side of the plasma display panel 10 is exposed, and the opening 18a of the front frame 18 and is optical. And a protective plate 19 made of glass or the like provided with an unnecessary radiation suppressing film for suppressing unnecessary radiation of a filter and electromagnetic waves, and the protective plate 19 has a front frame 18 around the periphery of the protective plate 19. It is attached to the front frame 18 by being sandwiched between the peripheral edge of the opening 18a and the protective plate pressing metal fitting 20. A frame-shaped dustproof member 21 made of a porous material such as polyurethane foam is disposed between the plasma display panel 10 and the protective plate 19 along the periphery of the image display area.

  Further, in the example shown in FIG. 4, the plasma display panel 10 and the front protective cover 16 of the module are disposed between the outer peripheral end portion of the plasma display panel 10 of the module and the protective plate 18 of the front protective cover 16. The sound absorbing material 22 is arranged so as to close the gap between the two. That is, in the gap between the outer peripheral edge of the plasma display panel 10 of the module and the protective plate 18 of the front protective cover 16, at the upper position of the module and at the periphery of the image display area of the plasma display panel 10. A sound absorbing material 22 is arranged in a gap at an outer position of the frame-shaped dustproof member 21 arranged along the gap so as to close the gap.

Here, in the present invention, as shown in FIG. 4, in the gap between the outer peripheral end of the module and the front protective cover 16, the sound absorbing material is used so as to close the gap at the upper position of the module. 22 is arranged. The sound absorbing material 22 can be composed of a porous material having elasticity such as polyurethane foam, polyethylene foam, rubber sponge, etc., having a density of about 0.01 to 0.5 g / cm ^3. The size is larger than the volume of the gap between the outer peripheral edge of the module and the front protective cover 16, and the sound absorbing material 22 having elasticity is inserted into the gap in a compressed state.

  That is, as shown in FIG. 4, the sound absorbing material 22 is disposed so as to fill and close the gap between the upper end of the plasma display panel 10 of the module and the front protective cover 16, and is generated from the plasma display panel 10. It is possible to prevent the noise sound from being transmitted between the module and the front cover 16 at the upper position of the module from entering the space between the module and the back cover 17. According to the experiments by the present inventors, the sound absorbing material 22 is disposed so as to block the gap at least at the upper position of the module, so that the noise sound of 8 KHz is reduced from 31.0 dB under the reduced pressure of the outside air such as a high altitude. It can be seen that it can be reduced to 25.9 dB, and a sufficient effect can be obtained by disposing the sound absorbing material 22 so as to close the gap in at least the upper position of the module.

As shown in FIG. 6, the sound absorbing material 22 may be disposed only at the upper position of the module outside the frame-shaped dustproof member 21, but as shown in FIG. The sound absorbing material 22 may be arranged in a frame shape over the entire circumference at a position outside the dustproof member 21 arranged along the periphery of the image display area. Furthermore, it is desirable that the sound absorbing material 22 has a density higher than that of the dustproof member 21. For example, when a polyurethane foam having a density of about 0.02 g / cm ³ is used as the dustproof member 21, the sound absorbing material 22 is used. The material 22 is preferably made of polyurethane foam having a density of about 0.03 g / cm ³ .

  As shown in FIGS. 4 and 5, four blower fans 23 are arranged at arbitrary intervals at the upper position of the module, and the back cover 17 is shown in FIGS. 8 and 9. As described above, a plurality of vent holes 17a are provided. That is, the heat generated in the circuit board 13 disposed in the space between the module and the back cover 17 or the heat generated in the plasma display panel 10 transmitted to the chassis member 11 via the heat radiating sheet 12 is the fan for blowing. 23, it is discharged to the outside of the casing through the vent hole 17a of the back cover 17, and the inside of the casing is thereby cooled.

  Here, in the present invention, as shown in FIG. 9, a plurality of vent holes 17 a are provided in the upper position of the back cover 17, and the blower fan 23 blows out on the inner surface of the back cover 17. A sound insulating material 24 made of a resin film, a metal foil, or the like is disposed so as to close the vent hole 17a other than the position corresponding to the portion 23a. That is, at the upper position of the back cover 17, the vent hole 17 a is opened only at a position corresponding to the blowing portion 23 a of the blower fan 23.

  In this manner, the blower fan 23 is disposed at the upper position of the module in the housing, and the ventilation hole 17a other than the position corresponding to the blowing portion 23a of the blower fan 23 is provided at the upper position of the back cover 17 as a sound insulating material. 24, and the vent hole 17a is opened only at a position corresponding to the blowing portion 23a of the blower fan 23, thereby preventing leakage of noise generated from the plasma display panel 10 to the outside of the casing, such as high altitude. It is possible to further reduce noise noise generated under reduced pressure of outside air.

  In the example shown in FIGS. 8 and 9, after the back cover 17 is formed, the sound insulating material 24 is disposed later to close the vent hole 17 a, so that the position where the blower fan 23 is disposed is changed. The effect that it is possible to easily cope with the problem by simply changing the position where the sound insulating material 24 is arranged is obtained. However, if the position where the fan 23 for air blowing is arranged is determined in advance and there is little change, FIG. 11, a sound insulating material may be provided from when the back cover 17 is molded. That is, if a plurality of vent holes 17a are arranged only at positions corresponding to the blowing portions 23a of the blower fan 23 at the upper position of the back cover 17, a part of the back cover 17 also serves as a sound insulating material. It can be.

  As described above, according to the present invention, it is possible to reduce noise generated from the plasma display device under reduced pressure of outside air such as high altitudes.

  In the above description, an example in which the front protective cover 16 includes the front frame 18 and the protective plate 19 made of glass has been described. However, the present invention is not limited to such a configuration. As an alternative, the structure may be divided into a front surface portion that holds the protective plate 19 and a frame-shaped intermediate portion that protects the outer periphery of the module and to which the back cover 17 is attached.

  As is apparent from the above description, according to the present invention, it is a useful invention that a high-quality plasma display device can be obtained even under a reduced pressure of outside air such as highland.

The perspective view which shows schematic structure of the plasma display panel of the plasma display apparatus by one embodiment of this invention. Explanatory drawing which shows the electrode arrangement of the plasma display panel of the plasma display device Exploded perspective view showing the internal arrangement structure of the plasma display device Sectional drawing which shows the principal part structure of the plasma display apparatus A plan view of the plasma display device viewed from the back with the back cover removed. Plan view of the front protective cover of the plasma display device as seen from the back The top view which looked at the front protection cover by another example of the plasma display device from the back A plan view showing a back cover of the plasma display device Top view of the back cover as seen from the back The top view which shows the other example of the back cover of the plasma display apparatus Top view of the back cover as seen from the back

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Plasma display panel 11 Chassis member 13 Circuit board 16 Front surface protection cover 17 Back cover 18 Front frame 19 Protection board 23 Blower fan 24 Sound insulation material

Claims (3)

A module configured by holding a plasma display panel having a plurality of discharge cells on the front side of the holding plate and arranging a circuit board on the back side of the holding plate, and housing the module and on the front side of the plasma display panel A housing having a front protective cover disposed and a back cover disposed on the back side of the holding plate, and a blower fan is disposed at an upper position of the module in the housing. A plasma display device characterized in that a plurality of ventilation holes are provided at an upper position, and a sound insulating material is arranged on the inner surface of the back cover so as to close the ventilation holes other than the position corresponding to the blowing portion of the blower fan. . A module configured by holding a plasma display panel having a plurality of discharge cells on the front side of the holding plate and arranging a circuit board on the back side of the holding plate, and housing the module and on the front side of the plasma display panel A housing having a front protective cover disposed and a back cover disposed on the back side of the holding plate, and a blower fan is disposed at an upper position of the module in the housing. A plasma display device characterized in that a plurality of air holes are arranged at a position corresponding to a blowing portion of the blower fan at an upper position. The plasma display device according to claim 1, wherein a sound absorbing material is disposed so as to close a gap between the module and the front protective cover.

Images