JP2001022280A - Plasma display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure flatness and strength of a pedestal part which supports a picture panel by improving the structure of the pedestal part and to make a plasma display device light weight. SOLUTION: This plasma display device is provided with the picture panel 30 in which the light emitted from a discharge cell structure 36 which is disposed between a transparent surface plate 32 and a back plate 34 is transmitted through the surface plate 32 and is displayed as a picture, and the pedestal part 40 which supports the picture panel 30 from the back face side. The pedestal part 40 is integrally formed as an external shape which corresponds to the back face shape of the picture panel 30, is equipped with grid frame material 42 having grid space 43 which penetrates from the surface to the back face, thereby, has the strength enough to support the PDP device, and enables to make the plasma display device light weight while having the flatness for retaining the picture panel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plasma display device, and more particularly to a plasma display panel (PDP) for displaying an image using plasma discharge, that is, a plasma display device.

[0002]

2. Description of the Related Art Plasma display devices (abbreviated as PDPs) can be manufactured much thinner than CRT image display devices, and have a flat image display surface. It is said to be useful for display devices and the like.

The image display mechanism of the PDP forms a fine cell structure between a pair of transparent glass plates, generates a plasma discharge in the cell structure, and emits light from a phosphor layer formed in the cell structure. The emitted light is transmitted through a transparent glass plate and displayed outside. A large number of transparent linear electrodes that intersect each other are formed on a pair of glass plates, and plasma emission is performed at the intersections of the linear electrodes to form a light-emitting image having an arbitrary pattern. By arranging the phosphor layers corresponding to the three primary colors of RGB, a color image can be displayed.

An image panel comprising a pair of glass plates and a cell structure constituting such an image display mechanism of a PDP has its back surface supported by a base made of a rigid metal structure. The base has almost the same area as the image panel, and is generally in contact with and supported by the entire rear surface of the image panel.

When the screen size of the PDP is small, the rigidity and strength of the base portion are not so required. However, when the screen size of the PDP is several tens of inches, the large-sized image panel is securely supported in a flat state. The structure of the base that can be stored is required. In the case of such a large-sized device, even if it is a floor-standing type or a wall-hanging type, the structure is several tens kg
A strong structure that supports the weight of the entire device is indispensable. Moreover, in order to reduce the weight of the whole PDP, it is required that the weight of the base portion be as light as possible.

The base portion of the conventional PDP is generally a flat aluminum product, an assembly of plate materials, or a die-cast product. In addition, the base portion has a thick plate shape as a whole, and a vertical and horizontal reinforcing bar is attached to the back side of the flat plate to secure the strength.

[0007] In order to efficiently dissipate the heat generated by the image panel, a heat radiating sheet having good heat conductivity is arranged between the image panel and the base.

[0008]

When the base portion of the PDP is formed of an aluminum die-casting product having a planar shape having a large area equivalent to that of an image panel, the structural strength is sufficient but the weight increases. There is a disadvantage of doing so.

Further, in such a large-area die-cast molded product, it is difficult to obtain a molded product having a high degree of flatness, so that the heat-dissipating sheet interposed between the image panel and the base portion has poor adhesion. There are also problems.

When the base of the PDP is made of a flat aluminum plate or an assembled product, it tends to have a weak structure in which twisting and twisting occur when a load is applied. It is also difficult to provide a support leg or a wall holder for supporting the weight of the entire apparatus on the base.

An object of the present invention is to improve the structure of a base portion of a PDP so that the base portion has strength enough to support the entire PDP device and can sufficiently hold the image panel without causing distortion. The aim is to reduce the weight while ensuring a good flatness.

[0012]

According to the present invention, there is provided a plasma display device in which light emitted from a discharge cell structure disposed between a transparent front plate and a back plate is transmitted through the front plate and displayed as an image. A plasma display device comprising a panel and a base supporting the image panel from the back side, wherein the base is integrally formed with an outer shape corresponding to the back shape of the image panel, and penetrates from the surface to the back. And a lattice frame material having a lattice space. [Plasma Display Apparatus] Basically, a structure similar to that of a normal plasma display apparatus can be adopted.

[0013] The plasma display device includes an image panel for displaying an image, a base portion for supporting the image panel, a circuit portion arranged on the back of the base portion, a housing for accommodating these components, and a housing for the housing. A front panel having a transparent front plate disposed on the front is provided. [Image panel] This is a main component of the plasma display device, and can employ the same structure as a normal PDP.

As a basic structure, a discharge cell structure for performing plasma emission is arranged between a transparent surface plate and a transparent or opaque back plate. A glass plate is usually used for the front plate and the back plate. In the cell structure, a phosphor layer is disposed on the inner surface of the cell, which is a fine space surrounded by a peripheral wall. A large number of fine linear electrodes are formed on the facing surfaces of the front plate and the rear plate, respectively. The linear electrode is ITO
It is a transparent electrode made of a film or the like. The linear electrodes on the front plate and the linear electrodes on the rear plate are arranged in directions different from each other.

The image panel is also provided with an insulating layer covering the linear electrodes, a structure for sealing gas in each cell structure, a circuit structure for transmitting an image signal to the linear electrodes, and the like.

In the present invention, the detailed structure of the image panel is not particularly limited, and the image panel can be configured by combining various structures employed in a general plasma display device. [Base unit] This is a structure in which the image panel is supported from the back side. It has a shape that is almost the same as or slightly larger than the back shape of the image panel.

The lattice frame member is composed of bar-like or beam-like lattices arranged in the vertical, horizontal, or diagonal directions, and has a lattice space penetrating from the surface to the back in the center of these lattices. The arrangement structure of the lattice and the lattice space is not particularly limited. For example, the lattice and the lattice space can be configured with lattices arranged at equal intervals in the vertical and horizontal directions and a rectangular or square lattice space. It can also be composed of a hexagonal lattice and a hexagonal lattice space. It is also possible to arrange a large number of lattice spaces composed of a circle, an ellipse, various polygons, and the like, and to use a part remaining in the middle as a lattice.

The lattice space provided in the lattice frame material is effective for reducing the weight of the lattice frame material, and is used to directly radiate the heat transfer from the image panel arranged on the front side to the outside air via the lattice space. It is valid. Therefore, it is desirable to set the arrangement shape of the lattice space and the lattice part in consideration of the mechanical properties such as rigidity required for the lattice frame material and the functions such as light weight and heat dissipation.

The lattice frame member can be provided with a screw hole for attaching a circuit portion to the lattice frame member, and a support leg for installing the base portion or the entire plasma display device. Additional structural parts, such as support legs, can be integrally formed at the same time as the grid frame is formed.

As the material of the lattice frame material, ordinary structural materials such as metal, synthetic resin, fiber reinforced resin, and ceramic can be used as long as they have sufficient rigidity and mechanical strength to support the image panel. . Various manufacturing means can be applied to the production of the lattice frame material, as long as the entire lattice frame material can be integrally formed, depending on the material to be used. For example, for metal, casting,
Various metal processing methods such as forging, punching and welding, various molding methods such as injection molding for synthetic resin, lamination pressure molding and hand lay-up method for fiber reinforced resin, firing method for ceramic etc. A manufacturing method suitable for each material can be applied.

When the lattice frame material is made of a magnesium alloy formed by a thixomolding method or a die casting method, the specific strength is increased, which is effective in reducing the weight.

The thixomolding method is a technique for obtaining a molded product by so-called thixotropic phenomenon by injection-molding a metal material such as a magnesium alloy in a semi-molten state in which a solid phase and a liquid phase are mixed. . It is known as a method capable of producing thin and precise molded products with high efficiency as compared with the ordinary die casting method.

The molding conditions for forming the lattice frame material by the thixomolding method vary depending on the dimensions and shape of the lattice frame material. For example, in the case of a large product such as a PDP having a product size of several tens of inches, The following conditions are preferred. Melting temperature 580-600 ° C, shear rate 30-70m / sec
c, injection speed 1.0 to 3.0 m / sec, mold temperature 23
0-270 ° C.

By applying the thixomolding method of a magnesium alloy, a light-weight lattice frame material having excellent mechanical strength can be obtained, and the thermal conductivity becomes sufficient. Furthermore, PDP
When disposing of the device, it is easy to collect the lattice frame material made of a magnesium alloy thixomolded product, re-dissolve, etc., and reuse it.

As the magnesium alloy, AZ91D containing magnesium, aluminum, zinc, manganese and the like is used.
(ASTM standard) and other ordinary magnesium alloys for thixomolds can be used.

The grid frame material can form a base portion alone, or a thin plate material is arranged on the surface of the grid frame material on the image panel side, and the base frame portion is formed by the grid frame material and the thin plate material. It can also be configured. Alternatively, at the time of molding by the thixomolding method, a thin plate material is mounted in a mold in advance, and molding is performed in a state where a part of the molding space is formed of the thin plate material, and the thin plate material is formed simultaneously with the formation of the lattice frame material. A method of integrating them can be adopted.
Such a method is called outsert molding.

The thin plate material improves the flatness and surface strength of the lattice frame material. It also has a function of equalizing the heat generated in the image panel in the plane direction and promoting heat radiation from the lattice space of the lattice frame material. As a material of the thin plate material, a metal material such as copper, iron, and aluminum having good thermal conductivity and excellent strength is preferable.

The thin plate material is used by being attached to the surface side of the lattice frame material by a fixing means such as bonding, soldering, brazing, welding, screwing, or the like.

By attaching a thin plate material to the lattice frame material, the rigidity of the entire base portion, particularly the surface rigidity, is increased. Therefore, the grid space can be expanded by making the grid portion of the grid frame material thinner or reducing the number thereof, and the thickness of the grid frame material can be reduced, and as a result, the overall weight can be reduced. Since the thin plate material has a wide flat surface, the image panel can be easily attached and fixed, and the flatness of the image panel can be improved.

When the lattice frame material and the thin plate material are made of different metals, a problem may occur at the contact surface between the different metals.
Therefore, for example, when the lattice frame material is made of a magnesium alloy, it is preferable to use a metal other than iron and copper, for example, aluminum as the thin plate material. [Heat transfer sheet] By interposing a heat transfer sheet between the base having the grid frame material and the image panel, the heat dissipation of the image panel is improved and the image panel is locally heated. Parts can be eliminated.

The heat transfer sheet is made of various metals, ceramics,
Synthetic resins and other inorganic and organic materials are used. A sheet having excellent heat conductivity in the plane direction is effective for making the heat or temperature of the image panel uniform.

The heat transfer sheet can be mounted between the image panel and the base by means such as adhesion or heat fusion. When fixing the image panel to the base with metal fittings or the like, only the heat transfer sheet may be interposed therebetween.

When the heat transfer sheet is used and the base portion is formed only of the grid frame material, the grid space of the grid frame material is arranged on the back of the heat transfer sheet. As a result, the heat of the heat transfer sheet is directly radiated from the lattice space to the outside air, and the heat radiation property is improved.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [Basic Structure of Plasma Display Device] In the embodiment shown in FIG. 1, the plasma display device has a rectangular thick plate shape as a whole and an image panel 30.
, Base part 40, circuit part 50, housing 10 and front panel 20
It is composed of

As shown in detail in FIG. 1B, the image panel 30 has a cell structure 36 between a front plate 32 and a back plate 34 made of a transparent glass plate. Although not shown, the cell structure portion 36 includes a large number of fine cells separated by partition walls, a filling gas filled in the cells, a phosphor layer coated on the inner surface of the cells, an electrode for plasma discharge, and the like. It has. In addition, on each of the opposing surfaces of the front plate 32 and the rear plate 34, linear electrodes made of a number of transparent conductors arranged in a direction intersecting each other are also arranged.

The image panel 30 is supported by the base 40 via a heat transfer sheet 60 on the back surface. The heat transfer sheet 60 is made of a material having excellent heat conductivity in the plane direction, such as a highly oriented graphite sheet, and has an effect of equalizing the heat generated in the image panel 30 in the plane direction on the back plate 34 side. . Further, there is also a function of releasing heat of the image panel 30 to the base portion 40 side.

The circuit section 50 incorporates a control circuit for driving and controlling the plasma display device. Although not shown, the circuit unit 50 and the image panel 30 are connected by wiring.

The housing 10 includes an image panel 30, a base 40,
And the circuit unit 50 to form an outer shell of the plasma display device. It is preferable that the housing 10 be provided with a ventilation hole or a ventilation slit so that the heat of the base portion 40 and the circuit portion 50 can be easily released to the outside.

The front panel 20 has a front plate 22 made of a transparent glass plate or a synthetic resin plate, and a front frame 24 made of metal, synthetic resin, or the like and holding the outer periphery of the front plate 22. The rear end of the front frame 24 is attached to the housing 10.

In the plasma display device, the light emission of the phosphor layer accompanying the plasma discharge in the cell structure 36 of the image panel 30 is performed by the transparent front plate 32 and the front panel 20.
The image is displayed as an image outside through the front plate 22. [Base] As shown in detail in FIG. 2, the base 40 has a lattice frame member 42 and a thin plate member 46.

The lattice frame member 42 is made of a magnesium alloy thixomold, and has a rectangular shape as a whole. A plurality of lattices are arranged at equal intervals vertically and horizontally, and a rectangular lattice space 43 is provided at the center of each lattice. Are formed.

A pair of left and right support legs 44, 44 are provided at the lower portion of the back of the lattice frame member 42. The support legs 44 are used for a support structure when the base unit 40 and the entire plasma display device are installed. A screw hole 45 is provided on the back surface of the lattice portion of the lattice frame member 42, and is used to attach the circuit unit 50 and the like to the back surface.

The thin plate 46 is made of a flat aluminum plate.
It is joined to the lattice frame member 42.

As shown in FIG. 1B, when attaching the image panel 30 to the base 40, the heat transfer sheet 6
0 is interposed. The heat transfer sheet 60 is disposed in close contact with the front surface of the thin plate member 46.

The heat generated in the image panel 30 is transmitted to the heat transfer sheet 60 disposed on the back surface, and is evenly transmitted to the entire surface of the heat transfer sheet 60. As a result, it is possible to prevent a portion of the image panel 30 from being locally heated. The heat transmitted to the heat transfer sheet 60 is transmitted to the thin plate member 46 that is in close contact with the back surface. Since the thin plate member 46 is also made of a metal having high thermal conductivity, it has a function of uniformly distributing local high heat over the entire surface.
Part of the heat transmitted to the thin plate member 46 is transmitted to the grid frame member 42 and is radiated from the surface of the grid portion of the grid frame member 42.
Further, in the lattice space 43 of the lattice frame member 42, since the thin plate member 46 is directly opened to the outside, heat is also radiated from the surface of the thin plate member 46. As a result, the heat generated in the image panel 30 is radiated extremely efficiently, which is effective for maintaining the quality performance of the image panel 30. [Base Section Only with Grid Frame Material] In the embodiment shown in FIGS. 3 and 4, the base section 40 is not provided with the thin plate member 42.

Therefore, the image panel 30 is directly disposed on the entire surface of the lattice frame member 42 via the heat transfer sheet 60.

In this case, the weight can be reduced by the absence of the thin plate member 46. The heat generated in the image panel 30 is directly transmitted from the heat transfer sheet 60 to the grid frame member 42, and is radiated directly from the back of the heat transfer sheet 60 at the grid space 43. Very good. [Embodiment with Different Shapes] The embodiment shown in FIG. 5 basically has the same structure as that of the above embodiment, but differs in the structure of details.

The lattice frame member 42 has a circular lattice space 4 in the center.
3a, a large number of rectangular lattice spaces 43b are arranged in two rows above and outside the lattice space 43b. Circular lattice space 43
“a” is a trace of the structure used as the gate injection port when the lattice frame member 42 was formed. Thus, it is possible to combine the lattice spaces 43a and 43b having different shapes.

A pair of left and right mounting pieces 48 are integrally formed on the upper side and the lower side of the grid frame member 42, respectively. The attachment piece 48 is used as an attachment structure for fixing the base unit 40 to the housing 10 and for installing the entire PDP. Depending on the size and structure of the PDP, the mounting pieces 48 can be further increased or the mounting location can be changed as necessary. [Outsert Molding] The embodiment shown in FIG. 6 employs outsert molding in which the lattice frame member 42 is formed and integrated with the thin plate member 46 at the same time.

As shown in FIG. 6B, the thin plate 46 is
A pair of left and right attachment pieces 48 are provided on the upper side and the lower side.
A through hole 41 for a sprue is provided at the center.
The thin plate member 46 is mounted on a forming die for forming the lattice frame member 42. The thin plate material 46 constitutes one surface of the molding space.

In this state, the molding material is supplied to the molding space to form the lattice frame member 42. The molding material is a through hole 41 for a sprue provided in the thin plate 46 from the back side of the thin plate 46.
Is supplied to the surface side of the thin plate material 46 through the
Is molded.

As shown in FIG. 6A, the lattice frame material 42
Is a rectangular frame-shaped outer frame portion 42f along the outer periphery of the thin plate material 46, a cylindrical sprue portion 47 disposed at the center and used for injecting the molding material, and an outer frame portion And a runner portion 49 serving as a passage for supplying the molding material to the groove 42f. A circular sprue portion 47 and a runner portion 49 branched in a branch shape and extending over the entire lattice frame member 42.
, Lattice spaces 43a and 43c are formed respectively.

In the above-described embodiment, the lattice frame member 42 is integrated with the thin plate member 46 at the same time as the molding of the lattice frame member 42, so that the production can be performed efficiently and the integration of the two is excellent. Since the sprue portion 47 and the runner portion 49 used for the molding are used as the constituent members of the lattice frame member 42 as they are, there is no need to remove the sprue or the runner after the molding, and the molding material can be used effectively.

It is also possible to form a grid-shaped portion on the front side of the runner portion 49 to partition the inside of the grid frame member 42 vertically and horizontally as in the embodiment of FIG.

[0055]

According to the plasma display device of the present invention, the base portion is provided with a grid frame having a grid space penetrating from the front surface to the back surface. That is, the weight of the base portion is reduced. A lattice frame material in which lattices are assembled vertically and horizontally can exhibit sufficient shape retention or rigidity. A lattice frame material having a relatively simple structure can be easily formed by various forming methods. The grid space will directly open the back of the image panel, heat transfer sheet, and thin sheet material placed on the front side to the outside air,
The heat radiation from these members can be greatly improved.

[Brief description of the drawings]

FIG. 1 is an overall structural diagram of a PDP device representing an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a base.

FIG. 3 is a sectional view of a main part showing another embodiment.

FIG. 4 is an exploded perspective view of a main part.

FIG. 5 is an exploded perspective view showing another embodiment.

FIG. 6 is a perspective view showing a lattice frame member side and an opposite side, showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Case 20 Front panel 30 Image panel 32 Surface plate 34 Back plate 36 Cell structure part 40 Base part 42 Grid frame material 43 Grid space 46 Thin plate material 50 Circuit part 60 Heat transfer sheet

Continued on the front page (72) Inventor Keizo Matsumura 1006 Kazuma Kadoma, Kazuma-shi, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C094 AA35 AA36 BA31 EB02 EC04 GB01 5G435 AA09 AA12 BB06 EE03 EE04 EE05 EE13 EE34

Claims (5)

[Claims] 1. An image panel in which light emitted by a discharge cell structure disposed between a transparent surface plate and a back plate is transmitted through the surface plate and displayed as an image, and a base supporting the image panel from the back side Wherein the base portion is integrally formed with an outer shape corresponding to the back shape of the image panel, and includes a grid frame material having a grid space penetrating from the front surface to the back surface. Plasma display device. 2. The plasma display device according to claim 1, wherein the base further includes, in addition to the lattice frame member, a thin plate member disposed on a surface of the lattice frame member on the image panel side. 3. The plasma display device according to claim 1, wherein the thin plate material is made of any one metal selected from the group consisting of copper, iron, and aluminum. 4. The plasma display device according to claim 1, wherein the lattice frame material is made of at least one material selected from the group consisting of a copper alloy, a magnesium alloy, an aluminum alloy, and a synthetic resin. 5. The lattice frame material is made of a magnesium alloy,
The plasma display device according to any one of claims 1 to 4, wherein the thin plate is made of a metal other than iron and copper.