JP4547920B2 - Plasma display device - Google Patents

Description

  The present invention relates to a plasma display device known as a thin, lightweight display device having a large screen.

  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, but high definition, large screen, and simple manufacturing are possible. Therefore, at present, the mainstream of the plasma display device 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 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 glass-based panel is bonded to a metal holding plate such as aluminum by using a double-sided adhesive made of acrylic, urethane, or silicon material, or heat conduction. A sheet was interposed and fixed (see Patent Document 1).
Japanese Patent No. 2807672

  By the way, the panel body of this plasma display device has a front glass plate and a rear glass plate bonded together through a partition wall, and a discharge gas mainly composed of neon is sealed at about 500 Torr, and is usually atmospheric pressure. Thus, the front glass plate is pressed against the partition wall of the rear glass plate.

  However, in areas where the atmospheric pressure is low, especially in high altitude areas, the adhesion between the front glass plate and the rear glass plate is weakened, and the gap between the partition formed on the rear glass plate and the front glass plate is reduced. A gap is generated, and a collision sound is generated due to vibration caused by repeated electrical adsorption and release of the surface glass plate, and the gap widens as it goes to higher altitudes, causing an erroneous discharge between adjacent pixels, resulting in a white screen. Cannot be displayed.

  When the ambient air pressure decreases in this way, a gap is generated due to a decrease in pressure on the panel, but this phenomenon becomes prominent when stress is applied to the panel to widen the gap.

  An object of the present invention is to solve such problems, and it is an object of the present invention to reduce the sound and erroneous discharge in the decompressed area of the panel body, and to ensure the display quality up to the highest possible area.

In order to achieve the above object, the present invention provides a panel body having a plurality of discharge cells and a panel body in which a pair of substrates having at least a transparent front side are opposed to each other so that a discharge space is formed between the substrates. A holding plate that is held on the front surface side through the member and on which the drive block is mounted on the rear surface side; and a housing that is mounted on the rear surface side of the holding plate and on which a support member for supporting the entire apparatus is mounted. In the adhesive member, the adhesive member disposed at a position facing the housing is separated from the adhesive member disposed in another portion.

  Further, the adhesive member disposed at a position facing the housing uses a material having a hardness lower than the hardness of the adhesive member disposed in another portion. In addition, the adhesive member disposed at a position facing the housing is made thinner than the thickness of the adhesive member disposed in another portion. Further, the adhesive member is composed of a heat conductive member, and is disposed by applying and curing a liquid heat conductive member.

  According to the present invention, there is no erroneous discharge even under reduced pressure of the outside air such as a highland, and a stable high image quality can be obtained by a simple method.

  Hereinafter, a plasma display device according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8, 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. Address electrodes 7 are formed. On the overcoat layer 6 between the address electrodes 7, a plurality of barrier ribs 8 are arranged in parallel with the address 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 address 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 address 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 electrode arrangement of the plasma display panel. As shown in FIG. 2, the scan electrode, the sustain electrode, and the address 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 address 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 address electrode and the scan electrode by applying a write pulse between the address 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 shows the overall configuration of a plasma display device according to an embodiment of the present invention in which the panel body having the structure described above is incorporated, and FIGS.

  In FIG. 3, the housing that accommodates the panel body 10 includes a front frame 11 and a metal back cover 12, and the front frame 11 is smaller than the outer dimensions of the panel body 10 and has a display area of the panel body 10. A larger opening 11a is provided.

  A front cover 13, which is a flat plate-shaped impact protection member having an optical filter, is disposed on the surface side of the panel body 10 by being attached so as to cover the surface side of the panel body 10. It is exposed from the opening 11 a of the front frame 11. The front cover 13 is provided with an unnecessary radiation suppressing film for suppressing unnecessary radiation of electromagnetic waves due to silver deposition or the like. Further, the back cover 12 is provided with a plurality of vent holes 12a for releasing heat generated in the panel body 10 and the like to the outside.

  The panel body 10 is bonded to the front surface of the chassis member 14 serving as a holding plate that also serves as a heat radiating plate made of aluminum or the like via a stretch-peeling adhesive (not shown in FIG. 3) that is a heat conductive member. On the rear surface side of the chassis member 14, a plurality of driving circuit blocks 15 for driving the panel main body 10 to be displayed are attached. The circuit block 15 includes an electric circuit for performing display drive and control of the panel main body 10, and as shown in FIG. 4, the chassis member 14 is provided on the electrode lead-out portion that is drawn to the edge of the panel main body 10. Are electrically connected by a plurality of flexible wiring boards 16 extending beyond the edges.

  Further, a boss portion 14a for attaching the circuit block 15 and fixing the back cover 12 is provided on the rear surface of the chassis member 14 so as to project. The chassis member 14 may be configured by fixing a fixing pin to an aluminum flat plate.

  As shown in FIG. 4, the heat conductive adhesive member 17 adheres and holds the panel body 10 to the front side of the chassis member 14, efficiently transfers heat generated in the panel body 10 to the chassis member 14, and dissipates heat. The thickness of the adhesive member is about 1 mm to 2 mm. The adhesive member 17 is located between the panel body 10 and the chassis member 14 and adheres to each other. The adhesive member 17 is made of acrylic, urethane, silicon resin, rubber, or the like, and an appropriate hardness is 15 to 40 for Asker C. The adhesive member 17 may be processed into a sheet shape, or may be a material obtained by applying a liquid uncured material to the panel body 10 or the chassis member 14 and curing it.

  FIG. 5 is a view seen from the back side with the back cover 12 of the plasma display device removed. In FIG. 5, reference numeral 18 denotes a housing attached to the rear surface side of the chassis member 14. The housing 18 is attached by a stand body 19 which is a support member for supporting the entire apparatus by inserting the pole 20. It is.

  FIG. 6 shows a side view of the housing 18. The housing 18 is attached by fixing a mounting seat 18 a provided integrally with the housing 18 to the boss portion 14 a of the chassis member 14 with a screw or the like.

  Normally, the housing 18 is attached after the panel body 10 and the chassis member 14 are bonded. However, the flatness of the mounting seat 18a of the housing 18 and the flatness of the boss 14a of the chassis member 14 are sufficient. When the housing 18 is attached, the chassis member 14 is deformed when the panel body 10 or the chassis member 14 is warped. Due to this deformation, the panel main body 10 bonded to the chassis member 14 is also deformed. However, the panel main body 10 is simply pressed by the atmospheric pressure on the front substrate 1 and the rear substrate 5. A sound is generated when the substrate 5 is separated and turned on.

  Therefore, in the present invention, as shown in FIG. 7, an adhesive member 17 a separated from the adhesive member 17 disposed in another portion is disposed at a position facing the housing 18, so that the panel body 10. The deformation of the chassis member 14 due to the attachment of the housing 18 to the chassis member 14 that is bonded and held is difficult to be transmitted to the panel body 10. In FIG. 7, FIG. 7A is a view of the adhesive member 17 as viewed from the front, and FIG. 7B is a view as viewed from the side. As the adhesive member 17a disposed at a position facing the housing 18, it is preferable to use a material whose hardness is lower than the hardness of the adhesive member 17 disposed in another portion.

  Further, as shown in FIGS. 8A and 8B, the adhesive member 17a disposed at a position facing the housing is made thinner than the thickness of the adhesive member 17 disposed in the other part, Either the panel main body side or the chassis member side may be configured not to adhere. In this case, the adhesive members 17 and 17a can be a sheet-like material or a material that is coated with a liquid material and cured. That is, in the case of the sheet-like adhesive members 17 and 17a, the adhesive member is provided on both sides, and the thickness of the adhesive member 17a is reduced, or the adhesive member 17a is reduced in thickness and only one side is non-adhesive. It is good also as a structure using what was made non-adhesive on both sides.

  Further, in the case of the liquid adhesive members 17 and 17a, it can be realized by changing the coating amount and changing the thickness.

  Moreover, it is preferable to use the heat conductive adhesive member excellent in the heat conductivity which mixed heat conductive agents, such as alumina and aluminum hydroxide, for these adhesive members 17 and 17a.

  Further, in order to reduce panel deformation when the housing 18 or the like is attached, it is also effective to attach the housing 18 to the chassis member 14 before bonding the panel body 10 and the chassis member 14 together. That is, first, the adhesive member 17 is disposed on the front side of the chassis member 14, and then the housing 18 is attached to the chassis member 14, and then the panel body 10 is adhered and held on the front side of the chassis member 14. By doing so, deformation of the panel body 10 can be reduced.

  As described above, according to the present invention, by reducing the deformation stress to the panel body, it is possible to reduce the sound and erroneous discharge in the decompression area of the panel body and to ensure the display quality up to the highest possible area. it can.

  As is apparent from the above description, according to the present invention, in the plasma display device, a useful invention in which a stable high image quality can be obtained by a simple method without any erroneous discharge even under reduced pressure of outside air such as high altitudes. It is.

The perspective view which shows schematic structure of the panel of the plasma display apparatus by one embodiment of this invention. Explanatory drawing which shows the electrode arrangement of the panel of the plasma display apparatus Exploded perspective view showing the internal arrangement structure of the plasma display device Side view of the plasma display device Overall perspective view seen from the back of the plasma display device Side view of the panel and housing part of the plasma display device (A), (b) is the top view and side view which show an example of the adhesive member of the plasma display apparatus (A), (b) is the top view and side view which show the other example of an adhesive member

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Panel main body 14 Chassis member 17, 17a Adhesive member 18 Housing 19 Stand main body

Claims (5)

A panel main body having a plurality of discharge cells arranged so as to form a discharge space between the substrates at least on a pair of transparent substrates on the front side, and holding the panel main body on the front side via an adhesive member and a rear surface A holding plate to which the drive block is attached, and a housing attached to the rear side of the holding plate and to which a support member for supporting the entire apparatus is attached, and the adhesive member is opposed to the housing A plasma display device, wherein an adhesive member disposed at a position is separated from an adhesive member disposed at another portion. The plasma display apparatus according to claim 1, wherein the adhesive member disposed at a position facing the housing is made of a material having a hardness lower than that of the adhesive member disposed in another portion. 2. The plasma display device according to claim 1, wherein the thickness of the adhesive member disposed at a position facing the housing is smaller than the thickness of the adhesive member disposed in another portion. The plasma display apparatus according to claim 1, wherein the adhesive member is made of a heat conductive member. The plasma display apparatus according to claim 1, wherein the adhesive member is disposed by applying and curing a liquid heat conductive member.

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