KR20040058920A - Plasma display panel - Google Patents

Abstract

PURPOSE: A plasma display device is provided to reduce frictional noises generated from the front surface of the plasma display device by improving a front cabinet assembly. CONSTITUTION: A plasma display device(20) comprises a plasma display module(21) including a chassis(21a), a panel(21b) arranged on the front surface of the chassis, and a driver circuit(21c) arranged on the rear surface of the chassis; a rear cover(22) arranged on the rear surface of the plasma display module; and a front cabinet assembly(30) arranged on the front surface of the plasma display module, wherein the front cabinet assembly includes a front cabinet, a filter fixed on the front cabinet, a filter holder for fixing the filter to the front cabinet, and a sound insulation member interposed between the front cabinet and the filter and which provides a flexibility for preventing noises generated from the expansion and contraction caused by the heat generated during the operation of the plasma display device.

Description

Plasma display panel {Plasma display panel}

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 device for preventing noise generated by expansion due to heat generated from a circuit board.

In general, a plasma display device injects a discharge gas into a cell space formed on an inner surface of a substrate bonded to each other, and places red, green, and blue phosphors at a predetermined position on the front substrate. After application, a high voltage current is applied to the inner surface of the substrate on which the electrodes are formed in a predetermined pattern to cause glow discharge, and the image is discharged by emitting phosphor by ultraviolet rays generated while the discharged gas emits light during glow discharge. It is a device to display.

1A is an exploded perspective view of a plasma display device according to the related art.

As shown, the back surface of the plasma display panel 11 which forms an image by discharge is adhered to the adhesive sheet 12 having thermal conductivity and attached to the front surface of the plate-shaped chassis 13. On the rear surface of the chassis 13, a driving circuit unit 14 provided with circuit elements for driving the plasma display panel is provided to be spaced apart by a predetermined interval through the connection device 15. The plasma display module 10 thus formed is mounted in a space formed by the front cabinet assembly 16 and the rear cover 17. In addition, the support 18 may be connected to the lower end of the chassis 13.

When the plasma display panel is driven, its temperature rises due to plasma discharge. The heat is transferred to the chassis 13 through the adhesive sheet 12, and this heat is also transmitted to the front cabinet assembly 16 and the rear cover 17. This causes thermal expansion and contraction. In particular, the front cabinet assembly 16 has a front cabinet 16a and a filter 16b fixed thereto, as shown in FIG. 1B, which is an exploded perspective view of the front cabinet assembly 16, and FIG. And a filter holder 16c for fixing the filter 16b to the front cabinet 16a, each of which is made of a different material. The front cabinet assembly 16 composed of such dissimilar materials transfers heat and thereby causes noise due to friction at the contacts due to different coefficients of thermal expansion when expansion occurs. This is true even when the front cabinet assembly 16 is cooled due to the release of heat.

Such noise causes discomfort to the user of the plasma display device and impairs the reliability of the product. In addition, the increase in the size of the plasma display device, which is a current trend, generates a higher temperature environment, which intensifies the noise problem.

In order to solve the noise problem, a technical configuration for preventing unnecessary noise generated from a circuit by a rear cover is disclosed in Korean Patent Laid-Open Publication No. 2001-0087381.

However, this configuration may serve to prevent noise inside the plasma display device, but does not prevent friction noise generated from the front cabinet assembly.

SUMMARY OF THE INVENTION The present invention has been made in an effort to solve the above problems, and to provide a plasma display device capable of reducing noise caused by friction generated at the front of the plasma display device.

1A is an exploded perspective view of a plasma display device according to the related art;

1B is an exploded perspective view of a front cabinet assembly of a plasma display device according to the prior art;

FIG. 1C is a cross-sectional view of section AA of FIG. 1A,

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

3A is an exploded perspective view illustrating an embodiment of a front cabinet assembly of a plasma display device according to the present invention;

FIG. 3B is a rear view illustrating a state in which sound insulation means is attached to the front cabinet of the front cabinet assembly of FIG. 3A;

3C is an enlarged view illustrating a portion B of FIG. 2 enlarged;

4A is an exploded perspective view showing another embodiment of a front cabinet assembly of a plasma display device according to the present invention;

Figure 4b is a rear view showing a state in which sound insulation is attached to the front cabinet of the front cabinet assembly of Figure 4a,

4C is an enlarged view illustrating a portion corresponding to portion B of FIG. 2,

5A is a table showing the number of noise occurrences for each noise level as a noise test result of the plasma display device according to the related art.

5B is a table showing the number of noise occurrences for each noise level as a noise test result of the plasma display device according to the present invention;

Figure 6a is a table showing the number of noise generation with time as a noise test result of the plasma display device according to the prior art,

Figure 6b is a table showing the number of noise generation with time as a noise test result of the plasma display device according to the present invention.

<Brief description of symbols for the main parts of the drawings>

21; Plasma display module 22; Back cover

30,40; Front cabinet assembly 31,41; Front cabinet

32,42; Filter 33,43; Filter holder

34,44; Soundproofing

In order to achieve the above technical problem, the plasma display device according to the present invention includes a plasma display module including a chassis, a panel provided at the front of the chassis, and a driving circuit unit provided at the rear of the chassis, and a rear surface of the plasma display module. A rear cover disposed on the front surface of the plasma display module, a front cabinet, a filter fixed to the front cabinet, a filter holder for bringing the filter into close contact with the front cabinet, and the front cabinet and the filter. And a front cabinet assembly having sound insulation means interposed therebetween to provide elasticity to prevent noise caused by expansion and contraction caused by heat generated when the plasma display device is driven.

The sound insulation means of the present invention may be made of a tape having a predetermined width and installed along a position where the front cabinet and the filter contact each other.

In addition, the plasma display device according to the present invention includes a plasma display module including a chassis, a panel provided at the front of the chassis, a driving circuit unit provided at the rear of the chassis, a rear cover disposed at the rear of the plasma display module, and the plasma. A front panel, a filter fixed to the front cabinet, a filter holder for closely fitting the filter to the front cabinet, between the front cabinet and the filter, and between the filter and the filter holder. And a front cabinet assembly having sound insulation means interposed therebetween to provide elasticity to prevent noise caused by expansion and contraction caused by heat generated when the plasma display device is driven.

The sound insulation means may be formed of a tape having a predetermined width and installed along a position where the front cabinet and the filter contact each other and a position where the filter and the filter holder contact each other.

The tape may be discontinuously disposed along the longitudinal direction, and the tape is preferably made of a nonwoven fabric.

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

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

Referring to the drawings, the plasma display device 20 may include a rear cover 22 disposed on the rear surface of the plasma display module 21 and the plasma display module 21 and a front surface of the plasma display module 21. And a front cabinet assembly 30.

The plasma display module 21 includes a chassis 21a, a panel 21b provided on the front surface of the chassis 21a, and a driving circuit portion 21c provided on the rear surface of the chassis 21a. The panel 21b is a portion which forms an image by discharge, and its rear surface is adhered to the adhesive sheet 21d having thermal conductivity and attached to the front surface of the plate-shaped chassis 21a. On the rear surface of the chassis 21a, a driving circuit portion 21c provided with a circuit element for driving the panel is provided to be spaced apart by a predetermined interval through the connection device 21e. The plasma display module 21 thus formed is mounted in a space formed by the front cabinet assembly 30 and the rear cover 22. In addition, a support 28 may be connected to the lower end of the chassis 13.

3A is an exploded perspective view of one embodiment of a front cabinet assembly 30 of a plasma display device according to the present invention.

Referring to the drawings, the front cabinet assembly 30 may include a front cabinet 31 and a filter holder 33 fixed to the front cabinet, and a filter holder 33 for closely contacting the filter 32 to the front cabinet 31. It is provided with soundproof means 34 interposed between the front cabinet 31 and the filter 32. The sound insulation means 34 has elasticity to prevent noise due to expansion and contraction caused by heat generated when the plasma display device is driven. Such sound insulation means 34 may be embodied as a tape having a predetermined width and in which the front cabinet 31 is installed along the position where the filter 32 is in contact, and the tape may be continuous or discontinuous. That is, one tape may be made to a length corresponding to one side or may be formed by connecting several tapes to one side.

3B shows a rear view of the sound insulation means 31, that is, the front cabinet 31 with the tape attached thereto.

Referring to the drawings it can be seen that the tape is formed continuously along the position to which the filter 32 is attached, which may be formed by connecting several tapes discontinuously.

3C shows an enlarged view of part B of FIG. 2.

Referring to the drawings, when the front cabinet 31 and the filter 32 is in contact with the sound insulation means 34, the sound insulation means 34 is expanded by the absorption of heat or contracted by the release of heat It serves to absorb the friction between the front cabinet 31 and the filter 32, thereby preventing noise caused by friction. The filter 32 is in close contact with the front cabinet 31 by a filter holder 43.

4A is an exploded perspective view of another embodiment of a front cabinet assembly 40 of a plasma display device according to the present invention.

Referring to the drawings, the front cabinet assembly 40, as described above, the front cabinet 41 and the filter 42 fixed to the front cabinet and the filter 42 is in close contact with the front cabinet 41 And a soundproof means 44 interposed between the filter holder 43 and the front cabinet 41 and the filter 42 and between the filter 42 and the filter holder 43. The soundproof means 44 has elasticity to prevent noise caused by expansion and contraction caused by heat generated when the plasma display device is driven. The sound insulation means 44 may have a predetermined width, and the front cabinet 4 may be implemented by a tape provided along the position where the filter 42 is in contact with the filter 42 and the filter holder 43. The tape may be continuous or discontinuous. That is, one tape may be made to a length corresponding to one side or may be formed by connecting several tapes to one side.

4B shows a rear view of the soundproof means 44, that is, the front cabinet 41 with the tape attached.

Referring to the drawings it can be seen that the tape is formed continuously along the position to which the filter 42 is attached, which may be formed by connecting several tapes discontinuously. In addition, the tape is also installed at the site where the filter 42 and the filter holder 43 are in contact, and the installed position has only the difference between the filter 42 and the filter holder 43, and the filter 42 ) And the tape provided between the front cabinet 41.

4C is an enlarged view corresponding to a portion B of FIG. 2 of the present embodiment.

Referring to the drawings, soundproof means 44 are interposed along a portion where the front cabinet 41 and the filter 42 contact and a portion where the filter 42 and the filter holder 43 contact each other. 44 absorbs friction between the front cabinet 41 and the filter 42 and friction between the filter 42 and the filter holder 43 when inflated by absorption of heat or contracted by release of heat. It serves to prevent noise caused by friction.

The tape described above should be made of a material capable of absorbing frictional noise during expansion and contraction experienced by each component of the front cabinet assembly 30 and 40 by the heat generated from the driving circuit 21c. In other words, the material must be able to absorb a difference in the expansion rate and shrinkage rate of each component by providing a constant elasticity. The material having such a property may be a tape of any material, and as an example of such a material, a tape may be formed using a nonwoven fabric. Both sides of the tape are coated with a certain adhesive in consideration of the assemblability to easily fix the filter 32, 42 to the front cabinet 31, 41 or the filter holder 33, 43 during the assembly process. can do.

As an example of the material of such a tape, SKC Corporation PD3100RW is mentioned.

The operation of the plasma display device 20 configured as described above is as follows. When the plasma display device 20 is operated, heat is generated in the driving circuit 21c, and the heat is transferred to the front cabinet assembly 30 and 40. The front cabinet assembly 30, 40 comprises front cabinets 31, 41, filters 32, 42, and filter holders 33, 43, as described above, typically the front cabinet 31. 41 is a plastic injection molding, filters 32 and 42 are glass materials, and filter holders 33 and 43 are aluminum extrudates. Thus, each coefficient of thermal expansion is different, so that when the heat is transferred, the extent of expansion is different. Therefore, friction occurs between each component during thermal expansion, and the plasma display device according to the prior art generates noise due to such friction. However, in the case of the plasma display device 20 according to the present invention, between the front cabinets 31 and 41 and the filters 32 and 42 or between the filters 32 and 42 and the filter holders 33 and 43. Since the sound insulation means 34 and 44 having elasticity installed serve to absorb such friction, generation of noise by friction as described above is prevented. The same applies to the contraction caused by the release of heat when the plasma display device 20 is stopped.

5A and 5B illustrate experimental results of dividing the number of noises generated by the noise level using the plasma display device according to the related art and the plasma display device according to the present invention.

The noise was measured at the front and back of the plasma display device, measured at a position corresponding to the center of the plasma display device at a distance of 50 cm, and was measured with no sound in a blue pattern for 90 minutes by applying power. Blocked and measured for 90 minutes. At this time, the atmospheric temperature was 24 degrees Celsius. The instrument used was a recorder with a four-channel sound level meter.

The display device according to the present invention used is a plasma display device having soundproof means interposed between a front cabinet and a holder.

Referring to the drawings, in the case of applying the power, the plasma display panel according to the prior art has a noise of 35 to 45 dBA at 27 and 34 times and a noise of at least 46 dBA to 68 times and 77 circuits at the front and rear. 95 times, rear noise generated 111 times, total 206 noises.

On the contrary, in the case of the plasma display panel according to the present invention, noise was not generated from the front surface, and the rear surface generated 15 noises of 6 times of 35 to 45 dBA and 9 times of 46 dBA.

When the power is cut off, in the case of the plasma display panel according to the prior art, the noise of 35 to 45 dBA is 16 and 23 times at the front and rear, and the noise at the front of the circuit is 35 times and the noise of 51 to 45 times more than 46 dBA is 51 times. A total of 133 noises generated 82 noises from the back.

On the other hand, in the case of the plasma display panel according to the present invention, the noise of 35 to 45 dBA is generated 9 times at the front and the rear at 15 times, and the noise of 46 dBA is generated 12 times at the rear, so that the noise generated at the front is 9 times and at the rear. A total of 36 noises were generated with 27 noises.

From the above results, it can be seen that the number of occurrences of noise is significantly reduced.

6A and 6B show the number of occurrences of noise of 35 dBA or more over time.

Referring to the drawings, it can be seen that, in the case of the plasma display panel according to the related art, noise is continuously generated at most about 20 times to at least about 3 times as time passes. In the case of applying power, no noise is generated at all for about 90 minutes, and only one to two noises are generated intermittently at the rear, and when the power is cut off, about two times of noise is intermittently generated at the front.

The above experimental results show that the noise generated by the thermal expansion and contraction of the plasma display device configured as described above is significantly reduced.

As described above, the present invention provides a plasma display device in which noise caused by friction caused by improving the front cabinet assembly is significantly reduced.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (8)

A plasma display module comprising a chassis, a panel provided at the front of the chassis, and a driving circuit unit provided at the rear of the chassis; A rear cover disposed at a rear of the plasma display module; The plasma display module is disposed on a front surface of the plasma display module, interposed between a front cabinet, a filter fixed to the front cabinet, a filter holder for fixing the filter to the front cabinet, and a plasma display interposed between the front cabinet and the filter. And a front cabinet assembly having soundproof means for providing elasticity to prevent noise caused by heat expansion and contraction caused by driving of the device. The method of claim 1, And the sound insulation means is made of a tape having a predetermined width and provided along a position where the front cabinet and the filter are in contact with each other. The method of claim 2, And the tape is discontinuously disposed along the longitudinal direction. The method of claim 2 or 3, And the tape is made of a nonwoven fabric. The method of claim 1, The front cabinet assembly further includes a soundproof means interposed between the filter and the filter holder to provide elasticity to prevent noise caused by expansion and contraction caused by heat generated when the plasma display device is driven. Display. The method of claim 5, And the sound insulation means has a predetermined width and is formed of a tape provided along a position where the front cabinet and the filter contact each other and a position where the filter and the filter holder contact each other. The method of claim 6, And the tape is discontinuously disposed along the longitudinal direction. The method according to claim 6 or 7, And the tape is made of a nonwoven fabric.