KR20040011174A - Display device using plasma display panel - Google Patents

Abstract

PURPOSE: An image display device is provided to achieve improved heat radiation characteristics of the driving circuit board, while reducing noises and electromagnetic interference generated from the driving circuit board. CONSTITUTION: An image display device comprises a chassis base(4); a plasma display panel(2) mounted on a surface of the chassis base; a plurality of driving circuit boards(8) mounted on the other surface of the chassis base; a shield member(6) having a main body mounted on the driving circuit board so as to reduce noises and electromagnetic interference of the driving circuit board, a pair of horizontal apertures disposed along the longer side direction of the chassis base, and a pair of vertical apertures disposed along the shorter side direction of the chassis base; a front cabinet(10) disposed in front of the plasma display panel; and a back cover(12) disposed in rear of the chassis base and assembled integrally with the front cabinet together with the chassis base.

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 device employing a plasma display panel, and more particularly, to an image display device having a structure that is excellent in heat dissipation while reducing noise and electromagnetic interference generated in a driving circuit board.

In general, a plasma display panel (hereinafter referred to as a 'PDP' for convenience) is a display device that realizes a predetermined screen by exciting a fluorescent film with vacuum ultraviolet rays caused by gas discharge therein, and is thinner than a cathode ray tube. And, there is an advantage that can be configured in a high resolution large screen.

The image display device is largely composed of a PDP, a chassis base fixedly supporting the PDP, and having a plurality of driving circuit boards mounted on the rear thereof, a front cabinet positioned in front of the PDP, and a back cover positioned behind the chassis base. The back cover is assembled to the front cabinet together with the chassis base to form the appearance of the image display device.

The driving circuit board mounted on the chassis base includes a power supply board, an image processing board, a logic board, an address buffer board, an X board, a Y board, and the like. These boards handle high voltage currents and generate heat as the power consumption exceeds 300W. Severe and noisy. Moreover, the board causes electromagnetic interference (EMI), which affects the operation of other devices or systems.

Therefore, the conventional image display device is equipped with a separate structure for the heat radiation, noise reduction and electromagnetic interference reduction of the board.

However, in the recent trend of thinning of image display devices, it is spatially limited to install all three of these structures in the chassis base, and the structures are only effective for the corresponding functions and conflict with the other functions. There is this.

That is, a structure for reducing electromagnetic interference is advantageous for shielding electromagnetic interference, but it is not effective for noise reduction and is disadvantageous for heat radiation, resulting in an increase in the temperature of the driving circuit board.

Thus, in the conventional image display apparatus, when any one structure is installed, a design is made to complement the function of other items in which the structure is not helpful in consideration of heat dissipation, noise, and electromagnetic interference items, respectively. However, this complicates the configuration of the driving circuit board and has disadvantages in that the image display device is thinner.

Therefore, the present invention is to solve the above problems, an object of the present invention is to install a structure that satisfies the heat dissipation, noise reduction and electromagnetic interference reduction function of the drive circuit board at the same time simplifying the configuration of the drive circuit board and advantageous to thin An image display apparatus is provided.

1 is an exploded perspective view of an image display device according to an embodiment of the present invention.

FIG. 2 is a front view of the chassis base shown in FIG. 1. FIG.

3 is a perspective view of the shielding member shown in FIG.

4 is a plan view of a shielding member for explaining a heat radiation function of the shielding member.

5 is a cross-sectional view taken along line II of FIG. 4.

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

A chassis base, a plasma display panel supported and mounted on one surface of the chassis base, a plurality of drive circuit boards mounted on the other surface of the chassis base, and mounted to enclose the drive circuit board to prevent noise and electromagnetic interference of the drive circuit board. Provided is an image display device including a shield member for reducing the heat dissipation effect of a driving circuit board, a front cabinet positioned in front of the plasma display panel, and a back cover positioned behind the chassis base.

Preferably, the shielding member is mounted to surround the upper surface of the driving circuit board to reduce noise and electromagnetic interference of the driving circuit board, and a pair of horizontal openings and chassis bases disposed opposite to the long side of the chassis base. A pair of vertical openings disposed along the short side direction are provided to allow air flow into the main body.

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 an image display apparatus according to an exemplary embodiment of the present invention, wherein the image display apparatus is configured to excite a fluorescent film with vacuum ultraviolet rays caused by gas discharge therein to implement an image (hereinafter, ' PDP '), a chassis base 4 for holding and supporting the PDP 2, a plurality of driving circuit boards 8 mounted on the rear surface of the chassis base 4 and provided with a shielding member 6, and a PDP (2) The front cabinet 10 located in front and the back cover 12 located behind the chassis base 4 are included.

The chassis base 4 has a structural strength sufficient to support the PDP 2, and is made of a material or structure having good heat dissipation to dissipate heat generated from the PDP 2 and the driving circuit board 8, and the chassis A plurality of engaging portions 16 are provided in the flange portion 14 surrounding the edge of the base 4.

The front cabinet 10 includes a conductive film filter 18 for preventing static electricity so that the conductive film filter 18 contacts the surface of the PDP 2, and the back cover 12 is connected to the front cabinet 10. Along with surrounding the chassis base 4 together, it is integrally assembled to the engaging portion 16 of the chassis base 4 through screws (not shown) to form an appearance of the image display apparatus.

Here, the image display device according to the present embodiment generates a lot of noise and electromagnetic interference among the plurality of driving circuit boards 6, and the shielding member 6 described below is provided on the driving circuit board having high heat generation. Through the shield member (6) of the noise and electromagnetic interference to reduce and realize the heat dissipation effect at the same time.

FIG. 2 is a front view of the chassis base shown in FIG. 1, and FIG. 3 is a perspective view of the shielding member shown in FIG. 1, showing a rear surface of the chassis base in FIG. 2.

As shown in the figure, a plurality of driving circuit boards for driving the PDP 2, that is, the power supply board 20, the image processing board 22, the X board 24, and the Y board 26 are located at the rear of the chassis base 4; ) And an address buffer board 28 and the like, and a configuration in which the shielding member 6 is mounted on the power supply board 20, the X board 24, and the Y board 26 as one example of these boards is illustrated.

The shielding member 6 has a main body 30 mounted on the driving circuit board 8 and surrounding the upper surface of the driving circuit board 8, and has a long side direction of the chassis base in the main body 30. In the drawing, a pair of horizontal openings 32 along the x axis) and a pair of vertical openings 34 along the short side direction (y-axis in the drawing) of the chassis base enable air flow into the main body 30. Let's do it.

More specifically, the main body 30 includes an opposing portion 30a positioned at a predetermined distance from an upper surface of the driving circuit board 8, and left and right side ends of the opposing portion 30a are formed on the driving circuit board 8. It consists of a pair of 1st support part 30b to fix, and the 2nd support part 30c which fixes the lower end of the opposing part 30a to the drive circuit board 8.

The first support portion 30b forms a pair of horizontal openings 32 at the lower end of the opposing portion 30a on which the second support portion 30c is located so that these horizontal openings 32 are in the long side direction of the chassis base (in the drawing). on the x-axis).

And the center of the 2nd support part 30c is opened, and the upper end of the opposing part 30a is open together, and forms a pair of vertical opening 34 to the upper and lower side ends of the opposing part 30a. This allows these vertical openings 34 to face oppositely along the short side direction (y-axis in the figure) of the chassis base.

At this time, the second support portion 30c forms a pair of guide portions 30d extending along the short side direction (y-axis in the drawing) of the chassis base at both end portions of the vertical opening 34 to the short side direction of the chassis base. To guide the airflow accordingly.

The shield member 6 having the above-mentioned configuration is formed in the driving circuit board 8 by forming the main body 30 with a metal, preferably copper, silver, nickel, gold, zinc or aluminum, which is advantageous for reducing electromagnetic interference. To reduce electromagnetic interference. In addition, since the main body 30 surrounds the driving circuit board 8, noise generated in the driving circuit board 8 is reduced.

In particular, the shielding member 6 having the above-described configuration is preferably configured of the main body 30 made of aluminum having high thermal conductivity in consideration of the heat dissipation characteristics of the driving circuit board 8.

4 is a plan view of the shielding member for explaining the heat radiation function of the shielding member, and FIG. 5 is a cross-sectional view taken along line II of FIG. 4.

As shown, the shield member 6 enables air flow along the short side direction of the chassis base 4 to the drive circuit board 8 by a pair of horizontal openings 32 and vertical openings 34, This air flow releases heat generated in the drive circuit board 8 to the outside to suppress the temperature rise of the drive circuit board 8.

That is, the cold airflow around the driving circuit board 8 is introduced into the shielding member 6 by the pair of horizontal openings 32 and the vertical openings 34 and mixed with the hot airflow generated in the driving circuit board 8. Therefore, the heat radiation characteristic of the drive circuit board 8 is improved by the airflow mixing effect of the shielding member 6.

At this time, the pair of guide portions 30d provided in the second support portion 30b guide the cold air flow at the lower end of the driving circuit board 8 into the shielding member 6, and the shielding member 6 is The inner surface of the opposing surface 30a is arranged to have a space of approximately 5 mm from the top surface of the heat sink 36 mounted on the drive circuit board 8 (marked t in the drawing) to ensure sufficient heat dissipation space.

As a result, cold airflow induced into the shielding member 6 is mixed with hot air generated by the heat generation of the driving circuit board 8 in the space between the heat sink 36 and the opposing portion 30a. Reduce the temperature

Furthermore, the shielding member 6 coats the black body film 38 on the inner surface of the body 30 to absorb heat waves generated in the driving circuit board 8, and the black body film 38 is preferably a matte black body. Is made of membrane.

The black body film 38 is formed by coating a material having an emissivity of 0.7 or more on the inner surface of the body 30, and increases heat transfer between the inner surface of the body 30 and the heat sink 36, which is a heat sink, using heat waves. At this time, since the black body film 38 and the heat sink 36 face each other directly without an intermediate block, the view factor is almost 1 to increase the heat transfer efficiency using heat waves, and the black body film 38 is thus used. It absorbs heat waves.

Normally, during the operation of the PDP 2, the internal temperature of the image display device is 50 ° C or more, and the heat dissipation effect due to natural convection and the heat dissipation effect due to heat wave absorption are almost similar in the ionic region. Accordingly, the shielding member 6 simultaneously realizes the temperature reduction effect by the airflow mixing and the temperature reduction effect due to the heat wave absorption of the black body film 38.

On the other hand, the shield member 6 of the above-described configuration forms a protrusion 40 at the end of at least one support portion, for example, the first support portion 30b, and the groove 42 is formed on the upper surface of the driving circuit board 8. And the projection 40 of the support part 30b is inserted into the groove 42 of the driving circuit board 8 to fix the shielding member 6 to the driving circuit board 8.

Furthermore, after the shielding member 6 is fixed through the combination of the above-described protrusion 40 and the groove 42, the outer circumference of the first and second support parts 30b and 30c may be fixed by soldering 44. In this case, even when an impact is applied to the image display device, the shielding member 6 can be prevented from being separated from the driving circuit board 8.

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, according to the present invention, the heat dissipation characteristics of the driving circuit board can be improved by using one shielding member, and noise and electromagnetic interference generated in the driving circuit board can be reduced, thereby simplifying the configuration of the driving circuit board and displaying images. There is an advantageous effect on the thinning of the device.

Claims (9)

A chassis base; A plasma display panel supported and mounted on one surface of the chassis base; A plurality of driving circuit boards mounted on the other surface of the chassis base; A main body mounted to surround the upper surface of the driving circuit board to reduce noise and electromagnetic interference of the driving circuit board, a pair of horizontal openings arranged along the long side direction of the chassis base, and opposite sides along the short side direction of the chassis base; A shielding member having a pair of vertical openings to enable air flow into the body; A front cabinet positioned in front of the plasma display panel; And And a back cover positioned behind the chassis base and integrally assembled to the front cabinet together with the chassis base. The method of claim 1, The main body of the shield member, An opposing portion positioned at a predetermined distance from an upper surface of the driving circuit board; A pair of first support portions having a pair of horizontal openings and fixing left and right side ends of the opposing portion to a driving circuit board; A second support having a vertical opening and fixing a lower end of the opposite portion to a driving circuit board, And an upper end of the opposing portion is opened to form another vertical opening. The method of claim 1, And the pair of guide parts extending along the short side direction of the chassis base at both ends of the vertical opening of the second support part. The method of claim 1, And the main body of the shielding member is made of any one metal selected from the group consisting of copper, silver, nickel, gold, zinc, and aluminum. The method of claim 4, wherein An image display apparatus in which the main body of the shield member is made of aluminum. The method of claim 1, And a black body film formed on the inner surface of the main body opposite to the upper surface of the drive circuit board to absorb heat waves. The method of claim 6, And the black body film is a matte black body film having an emissivity of 0.7 or more. The method of claim 2, And a projection formed at an end of at least one of the first and second support portions, and forming a groove on the upper surface of the driving circuit board to fix the shielding member to the driving circuit board by coupling the support portion and the groove. The method of claim 8, And an outer circumference of the first and second support parts by soldering to fix the shielding member to the driving circuit board.