JP2012230286A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plasma display (PDP) device which achieves less intensity difference with a simple and inexpensive structure even with use of a chassis having a concave portion on a panel side thereof.SOLUTION: A plasma display device includes: a plasma display panel; and a chassis which holds the plasma display panel. The chassis has a concave portion on its side closer to the plasma display panel. In the concave portion is provided either of a heat conduction component and a heat diffusion component which are constituted by any one of metal fiber, a metal sheet, a metal tape, and metal sponge which are fixed to the chassis or the plasma display panel with an adhesive.

Description

  The present invention relates to a plasma display apparatus (hereinafter referred to as a PDP apparatus) using a plasma display panel (hereinafter referred to as a panel) as a display device.

  Panels used in this PDP apparatus are roughly classified into AC type and DC type in terms of driving, and there are two types of discharge types, a surface discharge type and a counter discharge type. Therefore, at present, the mainstream of the PDP apparatus is a surface discharge type having a three-electrode structure.

  In this surface discharge type panel structure, at least a pair of substrates whose front side is transparent are arranged to face each other so that a discharge space is formed between the substrates, and a partition for partitioning the discharge space into a plurality is 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 a discharge space partitioned by the partition walls, and providing phosphors that emit red, green, and blue light emitted by the discharge. The 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 PDP device can display at a higher speed than a liquid crystal panel, has a wide viewing angle, is easy to be enlarged, and has a high display quality because it is a self-luminous type. It is used for various purposes as a display device in a place where many people gather or a display device for enjoying a large screen image at home.

  In such a PDP apparatus, a glass-main panel is held on the front side of a chassis member made of metal such as aluminum or iron, and a drive circuit for causing the panel to emit light is configured on the rear side of the chassis member. A module is configured by arranging a circuit board (see Patent Document 1).

JP 2003-131580 A

  By the way, in the conventional PDP device, the circuit board constituting the drive circuit is fixed to the chassis via a boss or the like. However, in order to reduce the number of parts and the cost, the chassis is subjected to shape processing to be a drawing structure, and the chassis body is projected. The circuit board is fixed by forming the portion. Furthermore, a reinforcing rib that increases the rigidity of the chassis is also substituted by this throttle structure.

  However, this diaphragm structure is a recess on the panel side of the chassis. For this reason, there is a problem in that the heat of the panel is not easily conducted and diffused in the region where the recess is formed, and a difference in luminance of the image display occurs, resulting in unevenness in image quality.

  The present invention has been made in view of such a situation, and an object of the present invention is to provide a PDP device that has an easy and inexpensive configuration and has no luminance difference even in a chassis having a recess on the panel side.

  In order to solve this problem, the present invention includes a PDP and a chassis that holds the PDP, and the chassis has a recess on the PDP side, and the recess has a heat conduction member or a heat diffusion member. It is said. Here, the heat conducting member or the heat diffusing member is preferably any one of a metal fiber, a metal sheet, a metal tape, or a resin sponge. Further, it is desirable that the heat conducting member or the heat diffusing member is a cylindrical metal sheet. Moreover, as for a heat conductive member or a heat-diffusion member, it is desirable to shape | mold the metal sheet in the convex shape to the PDP side. Further, it is desirable that the heat conducting member or the heat diffusing member be fixed to either the chassis or the PDP with an adhesive. Moreover, it is desirable that the heat conducting member or the heat diffusing member is thicker than the depth of the recess.

  According to the present invention, even in a chassis having a recess on the panel side, a uniform heat dissipation effect can be obtained, and a high-quality PDP device having no luminance difference can be obtained with an inexpensive and easy configuration.

The perspective view which shows schematic structure of the panel of the PDP apparatus by one embodiment of this invention. Exploded perspective view showing the internal arrangement structure of the PDP device The figure which shows the structure of the module of the PDP device The figure which shows the structure of the module of the PDP device The figure which shows the structure of the module of the PDP device The figure which shows the structure of the module of the PDP device

  Hereinafter, although the structure of the PDP apparatus by one embodiment of this invention is demonstrated using FIGS. 1-6, the aspect of this invention is not limited to this.

  FIG. 1 shows the structure of the panel in the PDP apparatus. As shown in FIG. 1, on a transparent front substrate 1 such as a glass substrate, a plurality of rows of stripe-shaped display electrodes 2 which are 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 where the intersections of the display electrodes 2 and the data electrodes 7 are located, and 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 example of the overall configuration of a PDP apparatus incorporating the panel having the structure described above. In the figure, a housing for housing the panel 10 is composed of a front frame 11 and a metal back cover 12, and an opening of the front frame 11 is made of a glass or the like that also serves as an optical filter and panel 10 protection. A cover 13 is arranged. Further, the front cover 13 is subjected to, for example, silver vapor deposition in order to suppress unnecessary radiation of electromagnetic waves. Further, the back cover 12 is provided with a plurality of ventilation holes 12a for releasing heat generated in the panel 10 and the like to the outside.

  The panel 10 is held by adhering to the front surface of the chassis 14 as a holding plate that also serves as a heat dissipation plate made of aluminum or the like via a heat conductive member (heat dissipation sheet) 15, and on the rear surface side of the chassis 14. A plurality of circuit blocks 16 for driving the display of the panel 10 are attached. The heat conductive adhesive is for efficiently transferring the heat generated in the panel 10 to the chassis 14 for heat dissipation. The circuit block 16 includes an electric circuit for driving and controlling the display of the panel 10, and extends to the electrode lead-out portion that is drawn to the edge portion of the panel 10 beyond the four edge portions of the chassis 14. They are electrically connected by a plurality of flexible wiring boards (not shown).

  Further, a boss portion 14a for attaching the circuit block 16 and fixing the back cover 12 is protruded from the rear surface of the chassis 14 by integral molding using die casting or the like. The chassis 14 may be configured by fixing the boss 14a to an aluminum flat plate or an iron plate.

  3 to 5 show the main part of a PDP apparatus according to an embodiment of the present invention.

  FIG. 3 shows a module in which a chassis 14 reinforced with ribs by a throttle structure is erected on a stand 23 via a bracket 22. FIG. 4A is a plan view of the front of the module, and FIG. 4B is a cross-sectional view from the side of the module. A recessed portion 21 is formed on the panel 10 side in the area of the aperture structure. And the metal fiber 24 is inserted in the recessed part 21, and the thermal radiation sheet 15 is affixed on the one surface of the chassis 14, and covers it.

  The heat radiating sheet 15 is made of a resin such as acrylic, silicon, urethane, and the like and made of a heat conductive filler (alumina, aluminum hydroxide, etc.), and the panel 10 is joined to the chassis 14 with adhesive portions or adhesive strength on both surfaces. . The metal fiber 24 is made of a fibrous metal (iron, stainless steel, copper, aluminum, etc.) similar to the metal scrubber, which is entangled with an air layer.

  As a result, the metal fiber 24 has a heat conduction function, is lightweight and elastic, can be expanded and contracted between the recess 21 and the heat radiation sheet 15, and does not apply a load to the panel 10. In addition, the elasticity makes it possible to reliably contact the panel 10 and the heat radiating sheet 15 with the chassis 14 and sufficiently diffuse the heat from the panel 10. The metal fiber 24 is desirably thicker than the depth of the recess 21. As a result, the contact between the panel 10 and the heat radiation sheet 15 and the chassis 14 is ensured.

  According to the experiments by the inventors, it has been confirmed that it is not necessary to increase the fiber density of the metal fibers 24, and by interposing the metal fibers 24 in the recesses 21, no luminance difference occurs at intervals of 1 mm in the image display section.

  In the embodiment of the present invention, the metal fibers 24 are inserted into the recesses 21. However, the present invention is not limited to this, and the metal sheet 25 may be formed in a cylindrical shape and inserted into the recesses 21 as shown in FIG. Accordingly, the panel 10 and the heat dissipation sheet 15 can be reliably brought into contact with the chassis 14 and the heat from the panel 10 can be sufficiently diffused. The metal sheet 25 is preferably a heat conductive material such as aluminum or copper.

  Further, as shown in FIG. 5, instead of the metal fiber 24, a resin sponge 26 having thermal conductivity is inserted into the recess 21, and a metal tape 27 having an adhesive on one side is attached from above the recess 21. Also good. The metal tape 27 is also preferably a heat conductive material such as aluminum or copper.

  Further, as shown in FIG. 6, a gasket 28 may be inserted into the recess 21 instead of the metal fiber 24. Here, the gasket 28 is a material in which the inside is a resin sponge having thermal conductivity and the periphery thereof is covered with a thermal conductive material. Then, after attaching the heat dissipation sheet 15, the adhesive surface of the metal tape 27 is attached to the panel 10 side of the heat dissipation sheet 15 toward the panel 10 at the position of the recess 21. Thereby, when the panel 10 is installed, the metal tape 27 adheres to the panel 10, heat diffusion is improved, and the heat dissipation effect is improved. As a result, the luminance difference of the recess 21 can be suppressed. 5 and 6 are cross-sectional views from the top of the module as (c).

  And as shown in FIG. 6, you may shape | mold the metal tape 27 in the convex shape at the panel 10 side. Thereby, the metal tape 27 can contact the panel 10 reliably, and heat diffusivity can be ensured. In this case, the gasket 28 may be omitted.

  As described above, the present invention is composed of the PDP and the chassis that holds the PDP. The chassis has a recess on the PDP side, and the recess has a heat conduction member or a heat diffusion member. Yes. Thereby, even a chassis having a recess on the panel side can provide a display having a luminance difference with an easy and inexpensive configuration.

  As described above, the present invention is useful for providing a high-quality PDP device that does not cause a luminance difference even in a low-cost chassis.

DESCRIPTION OF SYMBOLS 10 Panel 14 Chassis 15 Radiation sheet 21 Recessed part 22 Bracket 23 Stand 24 Metal fiber 25 Metal sheet 26 Resin sponge 27 Metal tape 28 Gasket

Claims (6)

A plasma display panel and a chassis for holding the plasma display panel;
The chassis has a recess on the plasma display panel side and a heat conduction member or a heat diffusion member in the recess. The plasma display device according to claim 1, wherein the heat conducting member or the heat diffusing member is any one of a metal fiber, a metal sheet, a metal tape, or a resin sponge. The plasma display apparatus according to claim 1, wherein the heat conducting member or the heat diffusing member has a cylindrical metal sheet. The plasma display device according to claim 1, wherein the heat conducting member or the heat diffusing member is formed by projecting a metal sheet toward the plasma display panel. The plasma display device according to claim 1, wherein the heat conducting member or the heat diffusing member is fixed to either the chassis or the plasma display panel by an adhesive. The plasma display apparatus according to claim 1, wherein the heat conducting member or the heat diffusing member is thicker than a depth of the recess.

Images