KR100467459B1 - Display device using plasma display panel - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide an image display device employing a plasma display panel which can reduce noise by preventing noise from ringing through a circuit board.

Accordingly, the present invention provides a cosmetic display device having a chassis base for supporting a plasma display panel, dissipating heat generated by the plasma display panel to the outside, and mounting a circuit board on the back thereof, wherein the chassis base and the circuit board are provided. Provided is an image display device employing a plasma display panel, wherein a sound absorbing member is attached to the cover to prevent a gap between the chassis base and the circuit board.

Description

Image display device employing plasma display panel {DISPLAY DEVICE USING PLASMA DISPLAY PANEL}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display apparatus employing a plasma display panel, and more particularly, to an image display apparatus capable of reducing noise by blocking noise and vibration generated from a circuit board installed in a chassis base.

In general, a plasma display panel (hereinafter referred to as a 'PDP' for convenience) is a display device that excites a phosphor by vacuum ultraviolet rays caused by gas discharge to realize a predetermined image. It is attracting attention as a thin display device.

The PDP is fixed to a chassis base on which the circuit board of the PDP is mounted, and the chassis base is integrally assembled with the front cabinet and the back cover constituting the appearance of the display device to complete the image display device.

Here, the chassis base is manufactured by die-casting or pressing a metal such as aluminum having good rigidity and thermal conductivity so as to firmly mount the circuit board of the PDP and to dissipate heat generated from the PDP and the circuit board to the outside. Used.

In addition, the chassis base is integrally provided with a plurality of bosses for fixing the circuit board and the like, and ribs for strength reinforcement, and the circuit board is mounted via the boss.

However, there is a problem that the chassis base causes noise by vibration between the circuit board to be installed, and therefore, there is a demand for technology development for noise reduction between the chassis base and the circuit board.

That is, in addition to the vibration of the circuit board itself when driving the PDP, the circuit board installed to be spaced apart from the chassis base by a certain distance acts as a ringing plate to further increase the noise.

Due to the vibration transmitted between the circuit board and the chassis base, the circuit board operates as a noise emitting source and generates a considerable noise to the outside.

However, in the related art, as illustrated in FIG. 4, the sound absorbing plate 100 is mounted on an upper portion of a component that mainly causes noise on the circuit board 70 installed on the chassis base 20 only to reduce noise.

However, the conventional structure has a difficulty in repairing when the circuit board is burned out, and there is a limit in noise reduction because it does not prevent the noise from the back of the circuit board.

Accordingly, an object of the present invention is to provide an image display device employing a plasma display panel that can reduce noise by preventing noise from ringing through a circuit board.

1 is an exploded perspective view of a general image display device.

2 is a schematic plan view showing a chassis base of the image display device according to the present invention;

3 is a schematic side cross-sectional view of a chassis base in accordance with the present invention.

4 is a schematic diagram showing a chassis base of an image display apparatus according to the prior art.

In order to achieve the above object, the present invention,

A makeup display device having a chassis base for supporting a plasma display panel, dissipating heat generated by the plasma display panel to the outside, and mounting a circuit board on the back thereof.

Provided is an image display device employing a plasma display panel, wherein a sound absorbing member is attached between the chassis base and the circuit board.

The sound absorbing member is extended between the bosses of the chassis base on which the circuit board is mounted and is continuously attached along the circumference of the circuit board.

Preferably, the sound absorbing member may be a sponge of a flame retardant material.

Accordingly, the noise coming out from the back of the circuit board is blocked by the sound absorbing member between the circuit board and the chassis base to reduce the noise.

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

1 is an exploded perspective view of a general image display device, FIG. 2 is a schematic plan view showing a chassis base of the image display device according to the present invention, and FIG. 3 is a schematic side cross-sectional view of the chassis base according to the present invention.

According to the above-described drawings, the image display device includes a plasma display panel 10 (hereinafter referred to as 'PDP' for convenience) and a chassis base 20 for fixing side surfaces of the PDP 10 and mounting a circuit board of the PDP. ), The front cabinet 30 located in front of the PDP 10, the back cover 40 positioned behind the chassis base 20 while surrounding the chassis base 20, the chassis base 20, and the back. A plurality of support members 50 are fastened to the connection of the chassis base 20 between the cover 40.

The chassis base 20 is, for example, die-cast aluminum, and integrally provided with a plurality of connecting portions along a circumference, and a plurality of ribs for strength reinforcement are selectively formed along a horizontal axis or a vertical axis on the front or rear surface thereof. On one surface facing the back cover 40, a plurality of bosses for fastening the circuit board 21 are formed at appropriate positions so that the PDP circuit board 60 can be mounted.

Here, in the image display apparatus according to the present exemplary embodiment, a sound absorbing member 70 made of a strip-shaped sponge is extended between the bosses 21 of the chassis base on which the circuit board 60 is mounted, so that the rear surface of the circuit board 60 is extended. And a gap between the chassis base 20 and the chassis base 20.

That is, as illustrated in FIG. 2, a band-shaped sound absorbing member 70 forming a closed curve in the same shape as the circuit board 60 is attached to the boss 21 of the chassis base.

In this case, a separate sound absorbing plate is not used on the circuit board 60.

In the present embodiment, the sound absorbing member 70 is not limited to the sponge except that it should be made of a special flame retardant material, and can be used without limitation as long as the material has a suitable cushion and absorbing power. More preferably, a material having no change under the PDP operating temperature is used.

In addition, the sound absorbing member 70 is not limited to its width since the sound absorbing member 70 is formed between the chassis base 20 and the circuit board 60, and the height of the sound absorbing member 70 is boss 21 at the chassis base. By forming slightly higher than the height to reach the upper end, when the circuit board 60 is installed, the sound absorbing member 70 is pressed against the rear surface of the circuit board 60 in close contact with the boss 21 to increase the adhesion and the circuit board 60 and the chassis base. (20) Completely close the gap between them.

Preferably, the width of the sound absorbing member 70 is about 10mm and the height is formed 1mm higher than the boss height.

In addition, in order to attach and install the sound absorbing member 70 to the chassis base 20, an adhesive or a double-sided tape may be used, and the like is not particularly limited.

As such, the sound absorbing member 70 having an appropriate width seals the entirety of the circuit board 60 and the chassis base 20 along the lower circumference of the circuit board 60, so that the noise vibrated by the circuit board 60 is reduced to the chassis. It is possible to prevent the discharge to the outside through the base 20 and the circuit board 60.

Table 1 below is a result of measuring the noise generated in the chassis base of the prior art and the present invention before and after the sound absorbing member is attached.

Noise measurement result division Sound Absorbing Member, Before Attaching Sound Absorbing Plate Prior art (with sound absorbing plate) The present invention (with sound absorbing member) Frequency (Hz) 50-8k 29.7 dB 29.4 dB 28.8 dB all 31.5 dB 31.2 dB 30.0 dB

The experiment was conducted in an anechoic chamber and measured using a microphone at a distance of 50 cm from the center of the 63 inch PDP. As shown in the above measurement results, when the sound absorbing member 70 is installed between the chassis base 20 and the circuit board 60, the noise of about 1 dBA at the frequency band 50 Hz to 8 kHz and about 1.5 dBA at the measurement frequency as a whole It can be confirmed that it is reduced.

In addition, it can be seen that the noise is reduced compared with the case where the sound absorbing plate is attached.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the range of.

As described above, the image display device according to the present invention closely installs a sound absorbing member in a gap between the circuit board and the chassis base and closes the gap, thereby generating a circuit element (for example, a field effect transistor (FET)) of the PDP driving circuit board. As vibration is reflected to the chassis base, noise is prevented from being emitted into the gap between the circuit board and the chassis base.

Accordingly, the effect of improving the quality of the PDP is obtained.

Claims (3)

A makeup display device having a chassis base for supporting a plasma display panel, dissipating heat generated by the plasma display panel to the outside, and mounting a circuit board on the back thereof. And a sound absorbing member is attached between the chassis base and the circuit board to close the gap between the chassis base and the circuit board. The image display apparatus according to claim 1, wherein the sound absorbing member is a sponge. The image display apparatus according to claim 1 or 2, wherein the sound absorbing member is formed so that its height is higher than that of the boss.