KR100759433B1 - Plasma display device - Google Patents

Abstract

The plasma display apparatus of the present invention includes a plasma display panel, a chassis base to which the plasma display panel is attached to one surface, a boss formed to protrude from the other surface of the chassis base, and circuit elements for controlling the plasma display panel. A ground portion is formed at a side surface, and a circuit board assembly having one side surface attached to an end surface of the boss, and a noise filter is provided between the circuit board assembly and the chassis base to reduce electrical noise. One end of the filter contacts the ground portion of the circuit board assembly, and the other end provides a plasma display device in contact with the chassis base.

Plasma, display, PDP, noise, filter

Description

Plasma display device {PLASMA DISPLAY DEVICE}

1 is a partially exploded perspective view of a plasma display device according to a first embodiment of the present invention.

FIG. 2 is a partial cutaway side view illustrating a state in which a noise filter is provided between a circuit board assembly and a chassis base in a plasma display device according to a first embodiment of the present invention.

3 is a partial cutaway side view illustrating a state in which a first intermediate member and a second intermediate member are additionally mounted to a noise filter in a plasma display device according to a second embodiment of the present invention.

4 is an exploded perspective view illustrating a noise filter and first and second intermediate members of a plasma display device according to a third embodiment of the present invention.

FIG. 5 is a cross-sectional view illustrating a third intermediate member disposed between the noise filter and the boss of the plasma display device according to the fourth embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: plasma display panel 11: thermal diffusion sheet

12: chassis base 13: circuit board assembly

14: set screw 15: boss

16: Noise filter 21: Ground part

30: first intermediate member 31: second intermediate member

40: groove 50: third intermediate member

The present invention relates to a plasma display device, and more particularly, to a plasma display device for reducing vibration and noise generated by circuit elements by improving a fastening structure between a chassis base and a circuit board assembly mounted thereto. It is about.

In general, a plasma display panel is a display device that implements an image by using a gas discharge phenomenon, and has excellent performance in characteristics such as display capacity, brightness, contrast, afterimage, and viewing angle.

The plasma display panel is formed by enclosing a front substrate and a rear substrate with a partition wall partitioning the discharge cells interposed therebetween. The front substrate includes sustain electrodes and scan electrodes corresponding to the respective discharge cells, and the rear substrate has respective discharges. An address electrode corresponding to the cell and disposed to intersect the sustain electrode and the scan electrode is provided.

Each of the discharge cells is filled with a discharge gas (for example, a mixed gas of neon (Ne) and xenon (Xe)), and phosphor layers each formed of phosphors generating red, green, or blue visible light are formed. have.

The plasma display panel selects a discharge cell to be turned on by an address discharge applied by an address pulse applied to the address electrode and a scan pulse applied to the scan electrode, and in this state, the discharge cell selected by the sustain electrode and the sustain pulse applied to the scan electrode. Causes sustain discharge in the chamber.

The sustain discharge generates vacuum ultraviolet rays, which excite phosphors in the discharge cells. The excited phosphors generate red, green, or blue visible light while being stabilized, and the image is represented by the combination of these visible lights.

In general, the plasma display apparatus includes a plasma display panel displaying an image, a chassis base supporting the panel, and a plurality of printed circuit board assemblies mounted on the chassis base.

A panel with double-sided tape is attached to the front of the chassis base, and a plurality of bosses are formed on the back of the chassis base, and the circuit board assembly is fixed to the boss by using a fastener such as a set screw.

The chassis base functions as a heat sink of the plasma display panel, and is electrically grounded with the circuit board assembly to reduce electromagnetic interference generated by the circuit board assembly (hereinafter referred to as 'EMI'). Done.

On the other hand, since the high voltage is switched at a high speed in the circuit elements of the circuit board assembly of the plasma display device, unexpected cross talk occurs and electric high frequency noise occurs. Such high frequency noise may affect peripheral circuit elements and cause a malfunction of the plasma display panel.

Conventionally, a method of electrically grounding the circuit board assembly and the chassis base has been used to reduce high frequency noise, but such a grounding method has a limit in reducing high frequency noise.

The high-frequency noise not only causes vibration and noise to reduce the reliability of the product, but also causes an electric shock to the circuit elements to prevent the plasma display panel from implementing a high quality image.

The present invention is to solve the above problems, an object of the present invention is to provide a noise filter for absorbing high-frequency noise between the circuit board assembly and the chassis base to reduce the vibration and noise generated by high-frequency noise It is to provide a display device.

In order to achieve the above object, the plasma display apparatus of the present invention includes a plasma display panel, a chassis base to which the plasma display panel is attached to one surface, a boss formed to protrude from the other surface of the chassis base, and the plasma display panel to be controlled. Circuit boards are mounted and a ground part is formed at one side, and the circuit board assembly is attached to one end surface of the boss, and electrical noise is reduced between the circuit board assembly and the chassis base. A noise filter is provided, wherein one end of the noise filter is in contact with the ground portion of the circuit board assembly and the other end is in contact with the chassis base.

The noise filter may be a spiral coil wound around the boss.

The noise filter is an elastic body and may elastically support the circuit board assembly and the chassis base.

A first intermediate member may be further provided between the circuit board assembly and the noise filter.

A groove in which an end of the noise filter is seated may be formed on the noise filter facing surface of the first intermediate member.

The first intermediate member may have a ring shape in which a hole is formed to penetrate the set screw.

A second intermediate member may be further provided between the noise filter and the chassis base.

A groove in which an end of the noise filter is seated may be formed on the noise filter facing surface of the second intermediate member.

The second intermediate member may have a hook shape in which a hole is formed to penetrate the boss.

The first intermediate member and the second intermediate member may be electrically conductive materials.

A third intermediate member may be provided between the outer circumferential surface of the boss and the noise filter.

The third intermediate member may be an electrically insulating material.

The third intermediate member may be formed of a buffer material to absorb vibration or noise generated between the noise filter and the boss.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like elements throughout the specification.

1 is a partially exploded perspective view of a plasma display device according to a first embodiment of the present invention.

As shown in FIG. 1, the plasma display panel 10 provided on the front surface implements an image, and the heat diffusion sheet 11 attached to the rear surface of the plasma display panel 10 generates heat generated by the plasma display panel 10. Absorbs and diverges, and the thermal diffusion sheet 11 and the plasma display panel 10 are attached to the chassis base 12. In addition, a boss 15 protrudes from the rear surface of the chassis base 12, and the circuit board assembly 13 is attached to the boss 15 by a set screw 14. In addition, a noise filter 16 is provided between the circuit board assembly 13 and the chassis base 12.

The circuit board assembly 13 generally includes a scan electrode driver board 13a, a logic board 13b, a power supply board 13c, an address buffer board 13d, a sustain electrode driver board 13e, and the like. .

In addition, although not shown in the drawing, a front cabinet (not shown) is provided on the front side of the plasma display panel 10 and a back cover (not shown) is provided on the rear side of the chassis base 12 to form an appearance of the plasma display apparatus.

The plasma display panel 10 is attached to one side of the chassis base 12 and fixed by using a double-sided tape, and the thermal diffusion sheet 11 is in close contact with the plasma display panel 10 and the chassis base 12, respectively. The heat generated from the display panel 10 is transferred to the chassis base 12.

The chassis base 12 has sufficient mechanical rigidity to support the plasma display panel 10 and the circuit board assembly 13, while a plurality of bosses 15 protrude from the rear surface of the chassis base 12. do. In addition, the circuit board assembly 13 is tightly fixed to the boss 15 by a fastener such as a set screw 14, and a boss hole (not shown) in which the set screw 14 is screwed is fixed to the boss 15. Is formed.

The circuit board assembly 13 is electrically connected to an electrode portion (not shown) of the plasma display panel 10 through a flexible printed circuit and a connector, and power supplying power to the circuit board assembly 13. A supply board 13c, a logic board 13b for receiving a signal to generate a control signal, an address buffer board 13d for receiving a control signal and applying a voltage to each address electrode for selecting a discharge cell to be activated; And a scan electrode driving board 13a and a sustain electrode driving board 13c for applying the driving signals transmitted from the logic board path 13b to the scan electrodes and the sustain electrodes.

In addition, other circuit elements (not shown) required for driving the plasma display panel 10 are mounted on the printed circuit board, and a heat sink is mounted on the circuit board assembly 13 to generate high heat. The heat sink dissipates heat generated in the high heat generating circuit to the outside.

FIG. 2 is a partial cutaway side view illustrating a state in which a noise filter is provided between a circuit board assembly and a chassis base in a plasma display device according to a first embodiment of the present invention.

As shown in FIG. 2, the plasma display panel 10 is attached to the front surface of the chassis base 12, and the boss 15 is formed to protrude to the rear surface of the chassis base 12. In addition, the ground portion 21 is formed in the circuit board assembly 13 and includes various circuit elements (not shown) for controlling the plasma display panel 10. In addition, the set screw 14 tightly fixes the circuit board assembly 13 to the boss 15, one end of the noise filter 16 is in contact with the chassis base 12, and the other end is in contact with the circuit board assembly 13. It comes in contact with the branch 21.

The circuit board assembly 13 is grounded to the chassis base 12 through the ground portion 21 and the boss 15. In addition, the coil-shaped noise filter 16 is provided between the ground portion 21 and the chassis base 12 and is formed by being wound on the outer circumferential surface of the boss 15.

A boss hole (not shown) is formed in the boss 15, and the set screw 14 is screwed into the screw hole.

One end of the noise filter 16 is electrically connected in contact with the ground portion 21 of the circuit board assembly 13, and the other end is electrically connected in contact with the chassis base 12.

The noise filter 16 absorbs high frequency noise generated between the circuit board assembly 13 and the chassis base 12. Therefore, high frequency vibration and noise generated by high frequency noise are reduced.

Generally, noise filter is installed in the middle of electricity circuit and used to filter or reduce electric noise of specific frequency band passing through this circuit. The components used in noise filter include coil and condenser. It is produced in combination.

In particular, the noise filter 16 according to the present embodiment includes a coil in the ground line, thereby completing the noise filter. The noise filter 16 attenuates or filters the electrical noise generated in the ground line.

The coil is a practical component that realizes inductance in the electric circuit, and generates back electromotive force according to the change of the current flowing through the circuit, and such back electromotive force reduces electrical noise. On the other hand, the characteristics of the counter electromotive force vary depending on the number of windings, the thickness or the material of the coil.

If the noise filter 16 is an elastic body such as a spring, the noise filter 16 elastically supports the chassis base 12 and the circuit board assembly 13, and the noise filter 16 absorbs the vibration of the circuit board assembly 13. To reduce it. If the noise filter 16 is not elastic, it will only function to absorb electrical noise between the circuit board assembly 13 and the chassis base 12.

The elastic modulus of the noise filter 16 is changed according to the thickness and material of the coil and the number of windings. Therefore, the shape or material characteristics of the noise filter 16 may be adjusted according to the vibration characteristics of the circuit board assembly 13, and thus vibration and noise may be easily reduced.

The noise filter 16 of this embodiment mainly aims to reduce high frequency noise by filtering, but can also reduce a low frequency or a specific frequency band.

In this embodiment, a noise filter 16 is provided between the circuit board assembly 13 and the chassis base 12 to reduce high frequency noise. As illustrated, the noise filter 16 has a structure and a shape similar to a coil. Have.

Basically, the noise filter 16 is preferably made of a conductive material having good electrical conductivity. In addition, the elasticity of the noise filter 16 may be maintained using a high rigid metal material.

3 is a partial cutaway side view illustrating a state in which a first intermediate member and a second intermediate member are additionally mounted to a noise filter in a plasma display device according to a second embodiment of the present invention.

As illustrated, a first intermediate member 30 is provided between the circuit board assembly 13 and the noise filter 16, and a second intermediate member 31 is disposed between the noise filter 16 and the chassis base 12. It is provided.

In the present embodiment, the first intermediate member 30 and the second intermediate member 31 are all installed, but in another embodiment, either the first intermediate member 30 or the second intermediate member 31 is provided. You can optionally install just one.

Since the first intermediate member 30 is formed with a hole through which the set screw 14 passes, the outer shape is similar to a hook, and the applicable material is preferably a conductive metal material.

A hole is formed in the second intermediate member 31 so as to be inserted into the boss 15, and a conductive metal is preferable as the material applicable to the first intermediate member 30.

The coil-shaped noise filter 16 pushes the first intermediate member 30 and the second intermediate member 31 toward the circuit board assembly 13 and the chassis base 12, respectively, to elastically support the noise filter 16. At this time, the first intermediate member 30 is in close contact with the ground portion 21 of the circuit board assembly 13, and the second intermediate member 31 is in close contact with the chassis base 12. Accordingly, the circuit board assembly 13 is easily grounded to the chassis base 12 through the first intermediate member 30, the noise filter 16, and the second intermediate member 31.

The noise filter 16 absorbs or reduces electrical noise transmitted from the circuit board assembly 13 to the chassis base 12 or vice versa.

On the other hand, the first intermediate member 30 has a relatively large contact area with the ground portion 21 and facilitates grounding between the circuit board assembly 13 and the chassis base 12.

Meanwhile, one side of the first intermediate member 30 may form a groove 40 on which the noise filter 16 is seated, and the groove 40 is disposed between the noise filter 16 and the first intermediate member 30. The connection structure can be strengthened and the contact area can be made larger.

The ground portion 21 has a property that is vulnerable to breakage because it uses a relatively soft electrical material. In particular, the end of the noise filter 16 may damage the ground portion 21. On the other hand, since the first intermediate member 30 has a relatively non-sharp contact surface, the ground portion 21 is not easily broken.

4 is an exploded perspective view illustrating a noise filter and first and second intermediate members of a plasma display device according to a third embodiment of the present invention.

As shown in FIG. 4, a hole is formed in the center portion of the first intermediate member 30, and the noise filter 16 has a coil shape and is inserted into the boss 15. In addition, a groove 40 in which one end of the noise filter 16 is seated is formed on one side of the second intermediate member 31.

In the present exemplary embodiment, the groove 40 is formed only in the second intermediate member 31, but the groove 40 may also be formed in the first intermediate member 30 if necessary. The noise filter 16 is firmly fixed by allowing the end of the noise filter 16 to be seated in the groove 40.

FIG. 5 is a cross-sectional view illustrating a third intermediate member disposed between the noise filter and the boss of the plasma display device according to the fourth embodiment of the present invention.

As illustrated, a third intermediate member 50 is provided between the outer circumferential surface of the boss 15 and the noise filter 16.

When the noise filter 16 vibrates in a direction perpendicular to the outer circumferential surface of the boss, the noise filter 16 may cause a fine collision with the outer circumferential surface of the boss 15. In particular, when the boss 15 and the noise filter 16 are made of metal, noise may be generated. In this case, the third intermediate member 50 may generate vibrations between the noise filter 16 and the outer circumferential surface of the boss 15. The noise is absorbed and reduced.

The third intermediate member 50 may be formed by applying a separate material to the outer circumferential surface of the boss 15 or by inserting a separate component into the outer circumferential surface of the boss 15, There is no special limitation.

In addition, in order to prevent electrical connection between the noise filter 16 and the boss 15, the material of the third intermediate member 50 may use an insulator having an insulating property, and the noise filter 16 may include the boss 15. In order to absorb the vibration and noise generated by hitting the outer circumferential surface of), a good cushioning material such as rubber or sponge can be used.

As described above, the noise filter 16 that absorbs electrical noise is preferably made of a metallic material having good conductivity. In addition, one end of the noise filter 16 is electrically connected to the circuit board assembly 13 and the other end is electrically connected to the chassis base 12.

On the other hand, the noise filter 16 having a metal material is radiated to the air by receiving a part of the heat of the circuit board assembly 13 or the chassis base 12. Thus, the noise filter 16 also functions to cool the circuit board assembly 13 and chassis base 12.

A heat sink for cooling the high heat generating element may be provided on the rear surface of the circuit board assembly 13. The heat sink function of the noise filter 16 may reduce the capacity of the heat sink, and thus, a plasma display device. Can reduce the production cost.

Although the embodiments of the present invention have been described in detail above, the scope of the present invention is not limited thereto, and various modifications and improvements of those skilled in the art using the basic concepts of the present invention defined in the following claims are also provided. It belongs to the scope of rights.

 As described above, the plasma display device according to the present invention includes a noise filter between the circuit board assembly and the chassis base, thereby reducing the electrical noise generated between the circuit board assembly and the chassis base to reduce noise and vibration generated by the noise. Reduce and increase the stability of the circuit. In addition, the coil-shaped noise filter elastically supports the circuit board assembly and the chassis base to absorb vibration and noise generated while the circuit board assembly is operating. In addition, the noise filter receives heat from the circuit board assembly and the chassis base and dissipates it into the air, thereby cooling the circuit board assembly and the chassis base.

Claims (13)

A plasma display panel; A chassis base to which the plasma display panel is attached to one surface; A boss protruding from the other surface of the chassis base and A circuit board assembly to which circuit elements for controlling the plasma display panel are mounted, a ground portion is formed on one side, and the one side is attached to an end surface of the boss; A noise filter is installed between the circuit board assembly and the chassis base to reduce electrical noise. One end of the noise filter contacts the ground of the circuit board assembly, and the other end of the noise filter contacts the chassis base. The method of claim 1, And the noise filter is a spiral coil wound around the boss. The method of claim 2, And the noise filter is formed of an elastic body and elastically supports the circuit board assembly and the chassis base. The method of claim 2, And a first intermediate member further disposed between the circuit board assembly and the noise filter. The method of claim 4, wherein And a groove in which an end of the noise filter is seated on the noise filter facing surface of the first intermediate member. The method of claim 4, wherein And the first intermediate member has a ring shape having a hole formed therethrough so that the set screw can pass therethrough. The method of claim 2, And a second intermediate member further disposed between the noise filter and the chassis base. The method of claim 7, wherein And a groove in which an end of the noise filter is seated on the noise filter facing surface of the second intermediate member. The method of claim 7, wherein And the second intermediate member has a ring shape having a hole formed therein so as to allow the boss to pass therethrough. The method according to claim 4 or 7, And the first intermediate member and the second intermediate member are electrically conductive materials. The method of claim 2, And a third intermediate member disposed between the outer circumferential surface of the boss and the noise filter. The method of claim 11, And the third intermediate member is an electrically insulating material. The method of claim 11, And the third intermediate member is made of a buffer material and absorbs vibration or noise generated between the noise filter and the boss.

Images