KR20060102252A - Sash base and the plasma display devise using the same - Google Patents

Abstract

The present invention relates to a chassis base and a plasma display device using the same. More particularly, the chassis base may be molded of a plastic material so that the chassis base can be manufactured in a relatively light and simple process, and reinforced to a joint portion of the boss and the chassis base. The present invention relates to a chassis base having a strong coupling force between a boss and a chassis base by forming a portion, a nut portion, and the like, and a plasma display device employing the same.

Plasma Display, Plastic Chassis Base

Description

Sash base and the plasma display devise using the same}

1 is a perspective view of a plasma display device according to an embodiment of the present invention;

2 is a cross-sectional view taken along the line A-A of FIG.

3A is a cross-sectional view of the chassis base in accordance with another embodiment of the present invention.

3B is a cross-sectional view of the chassis base in accordance with another embodiment of the present invention.

3C is a cross-sectional view of the chassis base in accordance with another embodiment of the present invention.

4 is a cross-sectional view of the chassis base according to another embodiment of the present invention.

5 is a perspective view of a boss according to another embodiment of the present invention;

<Description of Symbols for Main Parts of Drawings>

11, 13-Panel 20-Thermally Conductive Media

21-double sided tape 30-chassis base

35-metal plate 36-nut part

37-stiffeners 38-stiffeners

39-Boss 40-Protective Plate

50-TCP 51-Drive Chip

113-Circuit Board

The present invention relates to a chassis base and a plasma display device using the same, and more particularly, to a plastic chassis base and a plasma display device using the same.

Plasma display panels are formed by forming electrodes on two opposing substrates, overlapping them at regular intervals, injecting a discharge gas therein, and sealing the plasma display panel (PDP). Refers to a flat panel display device.

Plasma displays can be formed thinner than Cathode ray tube (CRT) displays, which occupy a large volume, and thus are suitable for realizing a large screen with a relatively small volume. In addition, the plasma display device does not need to form an active element such as a transistor as compared to other flat panel display devices such as LCDs, and has a general characteristic of wide viewing angle and high luminance.

The plasma display device is formed by forming a plasma display panel and installing elements necessary for screen realization such as a driving circuit connected to each electrode of the panel.

In a plasma display panel, each pixel is represented through discharge in that pixel region. The discharge is generated in the pixel space by the voltage applied to the electrode, and generates atoms in the plasma or excited state in the space. The power consumed by the discharge eventually ends up in light, but most of it is converted to heat in the panel. Materials such as phosphors that form the panel become a problem because they tend to deteriorate and denature when the temperature increases, and the life is shortened. In addition, overheating in the panel, in particular partial overheating, may cause thermal expansion deformation and subsequent stress of the glass plate, which is the substrate of the panel, and may cause breakage.

On the other hand, the driving circuit connected to the electrodes of the plasma display panel consumes a lot of power to implement the screen. The consumption of power eventually means heat generation, and when the driving circuit is overheated, it is likely to malfunction in the circuit operation. This malfunction may cause a problem that the quality of the screen is degraded, for example, to cause the discharge to occur even in the pixel portion that should not be discharged. Therefore, an important technical problem is how to effectively release heat generated from a driving circuit in which heat is concentrated in a plasma display device. In particular, if heat generation is concentrated, such as a driving chip portion of a tape carrier package (TCP), heat dissipation of a portion that is difficult to cool becomes a problem unless the heat sink is separately contacted with the heat sink.

In general, in the plasma display device, a chassis attached to the rear surface of a panel is generally used to dissipate heat from a heat generating part such as a panel and a driving circuit to the outside. The chassis is typically made by coupling the reinforcement to the plate-shaped chassis base. The chassis base may be integrally formed with a reinforcement part for reinforcement. The reinforcing material supplements the mechanical strength of the chassis base to prevent deformation of the chassis base due to external force, and also prevents warpage of the chassis base when the panel is deformed by heat, thereby preventing panel deformation. In the rear of the chassis, circuits for driving the panel are distributed on a plurality of substrates and mounted together with a power supply. The circuit board is normally spaced apart from the chassis base by a boss formed in the chassis base and installed in a state where there is no problem in air circulation.

The chassis base supports the panel to reinforce mechanical strength, and releases heat into the space while receiving heat from the panel or driving circuit in contact with the chassis and increasing the heat dissipation area. It also serves to evenly distribute partially concentrated heat. For this role, the chassis base is formed of a metal such as aluminum having excellent thermal conductivity.

On the other hand, when combining a heating element such as a panel or a driving circuit with the chassis, which is a kind of heat sink, it is common to increase the heat dissipation efficiency by interposing a heat conductive medium between the chassis and the heating element.

Meanwhile, there is a method of using a plastic chassis base instead of the conventional metal chassis base. The metal chassis base is relatively expensive in terms of material cost, molding cost, and the like, and has a large weight compared to plastic, and has a relatively complicated process in combining the base and the boss, the reinforcement, and the protective plate. On the other hand, the plastic chassis base has the advantage that the material cost is low by using a plastic material and can be simply molded by injection, so the process is simple and the weight is small.

The present invention is to solve the disadvantages of the conventional metal chassis base described above, after forming the integrally formed by joining the boss to the metal plate, and forming the chassis base by injection molding the plastic on both sides of the metal plate, the drive circuit It is an object of the present invention to provide a plasma display device having a low cost chassis base of a light and relatively simple process by attaching a thin metal plate to the surface of the chassis base in contact with the panel for grounding.

The chassis base of the present invention for achieving the above object is formed with a boss on the back of the body made of a plastic substrate, the boss is in contact with the metal plate in the plastic substrate.

In addition, in the chassis base of the present invention, in order to reinforce the coupling between the boss and the main body, the coupling portion of the chassis base may have a relatively thick plastic layer than the other portion, and in this case, the shape of the boss in the longitudinal section The center of the boss can be formed of any one of a triangle, a square, an arc (弧).

A portion of the boss that is in contact with the reinforcement portion may be formed with a nut protruding laterally, the nut shape of the nut portion may be formed in a polygon. The plastic substrate may be formed of a polyester resin or a polycarbonate resin, and the metal plate may be formed of aluminum which is light and has high electrical conductivity. In addition, the chassis base may be integrally formed by coupling the boss to the metal plate in one step, and the plastic layers may be molded on both sides of the metal plate by the injection method in two steps.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view of a plasma display device according to an exemplary embodiment of the present invention.

Referring to FIG. 1, the plasma display device according to the present exemplary embodiment includes a plasma display panel including two substrates 11 and 13, a chassis base 30 supporting the panel behind the panel, and a driving circuit mounted on the rear surface of the chassis base. The circuit board 113 is provided.

On the front substrate 11 of the panel, sustain electrodes having a straight shape parallel to each other are formed horizontally, and address electrodes having a straight shape parallel to each other are formed on the rear substrate 13. The partition wall is positioned in parallel with the address electrode, and a phosphor layer is disposed above the address electrode.

A chassis is installed behind the rear substrate 13. The chassis is provided with a chassis base 30 and a reinforcing material 37 that prevents warping or deformation of the chassis. The chassis base 30 is fixed to the rear surface of the rear substrate 13 by a double-sided tape 21 or the like. The thermal conductive medium 20 is interposed between the chassis base 30 and the rear substrate 13 together with the double-sided tape 21.

2 is a cross-sectional view taken along the line A-A of FIG.

In the chassis base 30 according to the present invention, referring to FIG. 2, unlike a conventional metal chassis base, a plate-shaped main body is formed of a plastic substrate, and a boss 39 is formed on a rear surface of the plastic substrate. The boss 39 is coupled to be energized with the metal plate 35 inserted into the plastic substrate.

In the driving circuit, since a high voltage is required to apply a voltage to a plurality of electrodes mounted inside the panels 11 and 13, it is necessary to stably ground it. In the present invention, the boss 39 and the metal plate 35 are coupled so as to be energized, and the boss 39 and the metal plate 35 both have good electrical conductivity, so that the current of the driving circuit is increased by the boss ( Through 39 to a metal plate 35. Therefore, the material of the metal plate 35 is good aluminum, etc. which is excellent in electrical conductivity.

The metal plate 35 not only serves as a grounding function for the driving circuit, but also performs a reinforcing function of the plastic chassis base. A metal plate is formed in the chassis base plate made of plastic material in an insert form, thereby preventing external shock, deformation due to heat generated inside, and the like.

Plastic chassis base is lighter than the conventional metal chassis base to reduce the weight of the entire product, there is an advantage that the material cost is relatively low compared to materials such as aluminum. In addition, since the metal plate 35 combined with the boss 39 is enclosed in the mold in order to surround the metal plate 35 with the plastic layer, it can be manufactured by injection molding which injects molten plastic, thereby making the process relatively simple. Has the advantage.

3A, 3B, and 3C are cross-sectional views illustrating that a reinforcement part is formed at an engagement portion between the boss and the chassis base.

3A to 3C, the chassis base 30 of the present invention, unlike the ordinary metal chassis base, reinforces the coupling between the main body and the main body 39 supporting the driving circuit unit. In the portion 30 of which the bosses 39 are coupled, the reinforcement portion 38 in which the plastic layer is formed relatively thicker than the rear surface of the chassis base 30 may be formed. The boss 39 is vertically coupled to the chassis base 30, but the coupling force between the boss 39 and the chassis base 30 is weakened due to external shocks, and thus, the support of the driving circuit part may be unstable. Therefore, by forming the reinforcement part 38 in the part of the chassis base 30 which contacts the boss 39, the coupling force of the boss 39 and the chassis base 30 can be strengthened, and the support of a drive circuit part can be stabilized. .

At this time, the shape of the cross section perpendicular to the chassis base 30 among the cross sections of the reinforcement part 38 is a right triangle, a rectangle, or two arc-shaped shapes having a center angle of 90 degrees with the boss 39 as the center axis. It may be formed to achieve left and right symmetry. 3A shows that the cross-sectional shape is triangular, FIG. 3B shows that the cross-sectional shape is rectangular, and FIG. 3C shows that the cross-sectional shape is arc-shaped. In addition to the triangle, quadrangle, and arc shape, various shapes of reinforcement part 38 may be formed, and the shape of the reinforcement part 38 is not limited thereto.

4 is a cross-sectional view illustrating a shape in which a nut part is further provided at a portion where a reinforcement part is formed.

In addition to forming the reinforcement portion 38 as described above in order to strengthen the coupling force between the boss 39 and the chassis base 30, referring to FIG. 4, the reinforcement portion 38 of the boss 39. A nut portion 36 protruding laterally may be formed at a portion in contact with the c). Since the thickness of the chassis base 30 is usually very thin, about 1 mm, it is easier to form the nut portion 36 in the reinforcement portion 38 having a thicker plastic layer than other portions. The nut part 36, together with the reinforcing part 38, serves to further strengthen the coupling force between the boss 39 and the chassis base 30. When the nut part 36 is formed, the surface area between the boss 39 and the chassis base 30 is further increased to increase the bonding force, and thus the support of the boss 39 to the driving circuit may be more stable. At this time, the nut shape of the nut part 36 may be formed in a polygon. 5 is an enlarged perspective view showing that the nut shape of the nut part 36 is hexagonal. The nut shape may be formed in various shapes such as square, hexagon, and octagon, but the shape of the nut is not limited thereto.

A plurality of circuit boards 113, a power supply, and the like are installed behind the chassis base 30. The circuit board 113 is provided with integrated circuit chips and other electrical and electronic element devices required for driving the panel. The circuit board and the circuit board are connected with signal lines as necessary.

A plurality of lead electrodes are formed around the plasma display panel attached to the front of the chassis. The lead electrode is formed outside the sealing part along the periphery of the panel to connect a plurality of electrodes such as an address electrode and a sustain electrode formed over the two substrate surfaces of the panel with the driving circuit. On the other hand, a driving circuit connected to the electrodes formed on the panel and driving them is mounted on the rear of the chassis while being installed in a circuit board or the like. In order to transfer an electrical signal of the driving circuit to each of the drawing electrodes, the drawing electrode and the driving circuit are connected by a tape carrier package (TCP) 50 or other signal lines.

Signal lines such as TCP 50 are made flexible, and both ends are connected to the circuit board and the panel coupled to the chassis, with the middle portion extending out of the panel and the periphery of the chassis main body. Therefore, these protruding parts may be in contact with or caught by external objects during the process of joining the panel and the chassis or during the movement of the assembly. In order to prevent such damage, the end of the panel is provided with protective plates 40 to protect the signal lines from the outside. The protective plates 40 are coupled via fastening means, such as screws, to the peripheral end of the chassis base 30 or to the reinforcement 37 around the end.

In forming the plastic chassis base in the present invention, the plastic is preferably formed of a polyester resin or a polycarbonate resin.

Polyester resins are generally referred to as Fiber Reinforced Plastics (FRP) because they are reinforced with glass fibers. Recent advances in molding can produce FRP with the same strength as steel. Polycarbonate resin is an engineering plastic that is transparent, has excellent mechanical properties and heat resistance, and is nontoxic and self-extinguishing.

The polyester resin and the polycarbonate resin are thermosetting resins, and it is preferable to use a thermosetting resin having excellent heat resistance to withstand heat generated from a panel or a driving circuit and having excellent mechanical properties to support the panel. However, the type of plastic is not limited here.

As described above, the present invention is not limited to the specific preferred embodiments described above, and any person having ordinary skill in the art to which the present invention pertains without departing from the gist of the present invention claimed in the claims. Various modifications are possible, of course, and such changes are within the scope of the claims.

According to the chassis base and the plasma display device according to the present invention, the plastic chassis base supports the panel like the conventional metal chassis base, and grounds the driving circuit by a metal plate in the plastic layer, and the metal plate serves to reinforce the chassis base. In addition, it is possible to provide a plasma display device having a low cost chassis base having a light and relatively simple process by supplementing the above-described disadvantages of the metal chassis base.

Claims (13)

A plasma display device comprising: a panel; a chassis base positioned behind the panel to support the panel; and a driving circuit portion supported by a boss formed at the chassis base behind the chassis base. The chassis base is characterized in that the boss is coupled to the rear surface of the metal plate and both sides of the metal plate is surrounded by a plastic layer. The method of claim 1, Plasma display device, characterized in that the plastic layer is formed relatively thicker than the other portion of the chassis base, the boss is coupled, the reinforcing portion The method of claim 2, The shape of the cross section perpendicular to the chassis base among the cross sections of the reinforcing part is any one of a triangle, a rectangle, and an arc that are symmetrical about the boss. The method of claim 2 or 3, And a nut portion protruding laterally in a portion of the boss that is in contact with the reinforcement portion. The method of claim 4, wherein The nut display of the nut portion is a polygonal display device characterized in that the polygon. The boss is coupled to the back of the metal plate, the chassis base, characterized in that both sides of the metal plate is surrounded by a plastic layer The method of claim 6, A portion of the chassis base to which the boss is coupled, the plastic layer is formed relatively thicker than the other portion, the chassis base, characterized in that to form a reinforcement The method of claim 7, wherein The shape of the cross section perpendicular to the chassis base among the cross sections of the reinforcing part may be any one of a triangle, a rectangle, and an arc, which are symmetrical about the boss. The method according to claim 7 or 8, A chassis base, characterized in that the nut portion protruding transversely formed in the portion in contact with the reinforcement portion of the boss The method of claim 9, The nut shape of the nut part is characterized in that the chassis base The method according to claim 1 or 2, The plastic is a plasma display device, characterized in that the polyester resin or polycarbonate resin The method of claim 1, Plasma display device characterized in that the material of the metal plate is aluminum The method of claim 1, Plasma display device having a chassis base formed by integrating the boss to the metal plate to be molded integrally, injection molding the plastic on both sides of the metal plate

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