KR20040088700A - Front-filter and display panel module using the same - Google Patents

Abstract

PURPOSE: A front filter and a display panel module using the same are provided to reduce weight and thickness of the panel by adhering a film type filter on the panel. CONSTITUTION: A front filter(80) comprises an electromagnetic wave shielding film(68) having a conducting pattern to prevent an electromagnetic wave emission from a display panel and formed on upper surface of the display panel, an antireflection film(62) for preventing light incident from an outside from being reflected again, and a grounding electrode formed on the electromagnetic wave shielding film along an outline of the antireflection film in such a manner that the grounding electrode is connected to the electromagnetic wave shielding film.

Description

Front filter and display panel module using the same {FRONT-FILTER AND DISPLAY PANEL MODULE USING THE SAME}

The present invention relates to a front filter, and more particularly, to a front filter capable of providing a grounding method suitable for a film type front filter and a display panel module using the same.

Plasma Display Panels (hereinafter referred to as "PDPs") are letters or letters that emit phosphors by 147 nm ultraviolet rays generated during discharge of an inert mixed gas such as He + Xe, Ne + Xe or He + Ne + Xe. An image containing graphics is displayed. Such a PDP is not only thin and easy to enlarge, but also greatly improved in quality due to recent technology development. In particular, the three-electrode AC surface discharge type PDP has advantages of low voltage driving and long life because wall charges are accumulated on the surface during discharge and protect the electrodes from sputtering caused by the discharge.

1 is a perspective view of a structure of an AC (AC) type PDP, in particular, showing a structure of a discharge cell corresponding to one sub-pixel.

The discharge cell shown in FIG. 1 includes an upper plate 15 having sustain electrode pairs 12A and 12B, an upper dielectric layer 14, and a protective layer 16 sequentially formed on the upper substrate 10, and the lower substrate 18. A lower plate 25 having a data electrode 20, a lower dielectric layer 22, a partition wall 24, and a phosphor layer 26 sequentially formed thereon is provided.

The upper substrate 10 and the lower substrate 18 are spaced apart in parallel by the partition wall 24. Each of the sustain electrode pairs 12A and 12B has a relatively wide width and is composed of a transparent electrode for transmitting visible light, and a relatively narrow width and metal electrode for compensating for the resistance component of the transparent electrode. The sustain electrode pairs 12A and 12B are constituted by the scan electrode 12A and the sustain electrode 12B. The scan electrode 12A mainly supplies a scan signal for determining the data supply time and a sustain signal for sustaining discharge, and the sustain electrode 12B mainly supplies a sustain signal for sustaining the discharge. Charges generated during gas discharge are accumulated in the upper dielectric layer 14 and the lower dielectric layer 22. The protective layer 16 prevents damage to the upper dielectric layer 14 due to the sputtering of the plasma, thereby increasing the lifetime of the PDP and increasing the emission efficiency of the secondary electrons. As the protective film 16, magnesium oxide (MgO) is usually used. The dielectric layers 14 and 22 and the protective layer 16 may lower the discharge voltage applied from the outside. The data electrode 20 is formed to cross the storage electrode pairs 12A and 12B. This data electrode 20 supplies a data signal for selecting the cells to be displayed. The partition wall 24 forms a discharge space together with the upper and lower substrates 10 and 18, and is formed in parallel with the data electrode 20 to prevent the ultraviolet rays generated by the gas discharge from leaking into adjacent cells. The phosphor layer 26 is applied to the surfaces of the lower dielectric layer 22 and the partition wall 24 to generate visible light of any one of red, green, and blue. The discharge space is filled with an inert gas such as He, Ne, Ar, Xe, Kr for gas discharge, a discharge gas having a combination thereof, or an excimer gas capable of generating ultraviolet rays by discharge.

The discharge cell of this structure is selected by the counter discharge between the data electrode 20 and the scan electrode 12A, and then holds the discharge by the surface discharge between the sustain electrode pairs 12A and 12B. As a result, in the discharge cell, the fluorescent material 26 emits light by ultraviolet rays generated during sustain discharge, so that visible light is emitted outside the cell. In this case, the discharge cell implements a gray scale by adjusting the discharge sustain period of the cell, that is, the number of sustain discharges, according to the video data.

On the top plate 15 of the PDP, a glass type front filter 50 is installed to shield electromagnetic waves and prevent reflection of external light as shown in FIG. 2.

The glass type front filter 50 shown in FIG. 2 has functions such as electromagnetic shielding, external light reflection prevention, near infrared shielding, and color correction generated from the PDP 30 to the front side. To this end, the glass type front filter 50 includes a first antireflection film 32 attached to the front surface of the glass substrate 34, an electromagnetic wave shielding film 38 attached to the rear surface of the glass substrate 34, and a near infrared shielding film. (42), and a second anti-reflection film (44).

The glass substrate 34 supports the glass type front filter 50 using acrylic or tempered glass, and protects the front filter 50 and the PDP 30 from being damaged by an external impact. The first and second antireflection films 32 and 44 may prevent the light incident from the outside from being reflected back to the outside to improve contrast. The electromagnetic shielding film 38 absorbs electromagnetic waves generated from the PDP 30 to shield the electromagnetic waves from being emitted to the outside. Near InfraRed shielding film 42 absorbs near-infrared rays of about 800-1000 nm wavelength band generated by PDP 30 to shield them from being radiated to the outside, so that control infrared rays generated by a remote control or the like (about 947 nm) interfere with near-infrared rays. It can be input normally to the infrared receiver provided in the PDP set. In addition, the near-infrared shielding film 42 includes a color control dye (Color Dye) to increase the color purity by adjusting the color tone. These multiple thin films 32, 38, 42, 44 are attached to the glass substrate 34 via adhesive or adhesive.

On the other hand, the electromagnetic shielding layer 38 is provided with a metal bar 46 is formed to protrude along the outside of the electromagnetic shielding layer 38. The metal bar 46 is formed of a conductive material and used as a grounding electrode for shielding electromagnetic waves. In addition, a black frame 38 is formed between the glass substrate 34 and the electromagnetic shielding layer 38 to determine an effective screen of the PDP.

The glass type front filter 50 is separated from the PDP 30 and mounted separately from the PDP 30. That is, the PDP 30 is attached to a heat sink (not shown) for dissipating heat emitted from the PDP 30 and separated from the glass front filter 50.

The glass type front filter 50 is fastened to the front cover 56 of the case so that the first antireflection film faces the front side as shown in FIG. 3. The filter support portion 52 which is located on the rear surface of the glass type front filter 50 and is mechanically connected to the rear cover (not shown) is connected to the metal bar of the glass type front filter 50 through the finger strip gasket 54. Electrically connected to 46 prevents EMI from being emitted to the side of the front filter 50.

In the conventional glass type front filter 50, a glass substrate 34 is used to prevent the glass type front filter 50 from being damaged by an impact from the outside. The glass substrate 34 included in the glass front filter 50 increases the thickness and weight of the glass front filter 50. In addition, since the glass type front filter 50 separated from the PDP 30 requires additional space, the overall thickness of the PDP 30 is increased, and since the first and second anti-reflection films 32 and 44 are required, contrast contrast There is a problem that the optical properties are lowered. In addition, since the temperature of the heat generated in the PDP 30 is maintained in the empty space between the PDP 30 and the glass type front filter 50, the temperature of the surface of the PDP 30 is increased.

In order to solve this problem, a film type front filter in which the glass substrate 34 is removed has been proposed. However, since the film type front filter is bonded to the upper substrate of the PDP, there is a problem in that a metal bar for grounding the case cannot be formed.

Accordingly, an object of the present invention is to provide a front filter capable of providing a grounding method suitable for a film type front filter and a display panel module using the same.

1 is a perspective view showing the structure of a conventional three-electrode AC surface discharge type plasma display panel.

FIG. 2 is a cross-sectional view illustrating a vertical structure of the glass type front filter and the plasma display panel shown in FIG. 1.

3 is a cross-sectional view illustrating a grounding process of the glass type front filter and the filter support unit illustrated in FIG. 2.

4 is a cross-sectional view illustrating a vertical structure of a plasma display panel to which a film type front filter according to the present invention is attached.

FIG. 5 is a plan view illustrating in detail a black frame and a metal bar of the film type front filter illustrated in FIG. 4.

6 is a cross-sectional view illustrating a grounding process of the film type front filter and the filter support unit illustrated in FIG. 4.

7A and 7B are views illustrating in detail the connection unit shown in FIG. 6.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12A: scanning electrode

12B: sustain electrode 14, upper dielectric layer

15, 92: top plate 16: protective film

18: lower substrate 20: data electrode

22: lower dielectric layer 24: partition wall

26: phosphor 25, 94: lower plate

30, 60: PDP 32, 44, 62: antireflection film

34: glass substrate 36,66: black frame

38,68: electromagnetic shielding film 42,72: near infrared shielding film

46,76: Metal bar 50: Glass type front filter

52,82: filter support 56,86: front cover

80: film type front filter 84,90,92: connection part

In order to achieve the above object, the front filter according to the present invention is formed on the upper surface of the display panel and includes an electromagnetic shielding film including conductive patterns for preventing the emission of electromagnetic waves from the display panel, and the incident from the outside on the electromagnetic shielding film And an anti-reflection film for preventing light from being reflected back to the outside, and a ground electrode formed along the periphery of the anti-reflection film on the electromagnetic shielding film so as to be connected to the electromagnetic shielding film.

The ground electrode is formed of at least one of silver, gold, platinum, copper and aluminum.

The ground electrode is formed of a conductive tape.

The front filter may further include a black frame on the display panel to determine an effective display area of the display panel.

The ground electrode may be formed to overlap the black frame with a relatively narrow width than the black frame.

In order to achieve the above object, the display panel module according to the present invention includes a display panel, a film-type front filter having a ground electrode protruding in the opposite direction to the display panel attached to the display panel on the front of the display panel; And a filter support part for grounding the film type front filter to the rear cover, and a connection part attached to the filter support part and connected to the ground electrode of the film type front filter.

The connection part is formed of a conductive metal in the form of a leaf spring bent at a predetermined angle.

The connection part may be connected to the ground electrode while the conductive metal bent at the predetermined angle is pressed by the pressure.

The connection part may be formed of an absorbing layer and a conductive layer formed to surround the absorbing layer.

The conductive layer of the connection part is characterized in that the absorbing layer is pressed while being pressed by the pressure is connected to the ground electrode.

Other objects and features of the present invention in addition to the above objects will become apparent from the description of the embodiments with reference to the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to FIGS. 4 to 7B.

4 is a cross-sectional view showing a film type front filter according to the present invention.

Referring to FIG. 4, the film type front filter according to the present invention includes a near-infrared shielding film 72, an electromagnetic shielding film 68, and an anti-reflection film 62 that are sequentially attached to the upper plate 45 of the panel 60.

The near-infrared shielding film 72 absorbs the near-infrared generated from the panel 60 and shields it from being radiated to the outside. The near-infrared shielding film 72 includes a color adjusting dye to increase color purity and is formed integrally with a color correction film (not shown) for adjusting color tone or separately. The near-infrared shielding film 72 is formed by coating a dye that absorbs near-infrared rays on a film such as PET or TAC, or absorbs near-infrared light to an adhesive located between the near-infrared shielding film 72 and the top plate 45 of the panel 60. It is formed by mixing dyes.

The electromagnetic wave shielding film 68 absorbs and discharges electromagnetic waves generated from the panel 60 to shield the electromagnetic waves from being emitted to the outside. That is, the electromagnetic wave absorbed in the electromagnetic shielding film 68 is grounded with a case (not shown) formed of a metal material to prevent the electromagnetic wave from escaping to the outside of the panel 60. The electromagnetic shielding film 68 is formed of a transparent conductive film or a metal film in the form of a lattice. For example, the electromagnetic shielding film 68 is formed by stacking several layers of a transparent conductive film having a relatively high resistance such as ITO and SnO, and a thin film coated with a metal having a relatively low resistance such as silver, gold, and platinum at about tens of nm. .

The anti-reflection film 62 prevents light incident from the outside from being reflected back to the outside. The anti-reflection film 62 is formed to have a relatively narrow width so that the metal bar 76 connected to the electromagnetic shielding film 68 is exposed. The anti-reflection film 62 is formed on a transparent film such as PET or TAC by a wet coating method, a sol-gel method, a deposition method, or the like.

Meanwhile, the film type front filter 80 includes a black frame 66 formed between the near infrared shielding film 72 and the panel 60 to determine an effective screen area of the panel 60. The black frame 66 is formed of black ceramic so as to protrude along the outer edge of the panel upper plate 45.

The film type front filter 80 according to the present invention includes a metal bar 76 positioned at an outer side of the black frame 66 as shown in FIG. 5. The metal bar 76 is formed along the edge of the anti-reflection film 62 on the electromagnetic shielding film 68 to be connected to the electromagnetic shielding film 68 and to ground the electromagnetic shielding film 68 to a case (not shown). It is an electrode. The metal bar 76 is formed by printing a relatively good conductive material such as silver, gold, platinum, copper, and aluminum in the form of a paste, or by attaching a relatively good conductive material to the conductive tape. The width of the metal bar 76 is determined within a range that does not invade the effective display area determined by the black frame 66.

6 is a cross-sectional view illustrating a display panel module including a film type front filter having a metal bar according to the present invention.

Referring to FIG. 6, the display panel module including the film type front filter includes a filter support part 82 for connecting the film type front filter 80 attached to the panel 60 and a rear cover (not shown); A connecting portion 84 positioned between the filter support portion 82 and the film type front filter 80 and a front cover 86 for protecting the film type front filter 80 are provided.

The filter support portion 82 electrically connects the film type front filter 80 to the rear cover. To this end, the filter support portion 82 grounds the film type front filter 80 to the rear cover through a connection portion 84 connected to the filter support portion 82 and prevents EMI from being emitted to the side surface.

The connecting portion 84 electrically connects the filter support portion 82 and the metal bar 76 of the film type front filter 80. This connecting portion 84 is fixed to the filter support portion 82 with a conductive adhesive tape (not shown). This connection 84 is formed in the form of a finger strip gasket shown in FIG. 7A or in the form of a conductive foam shown in FIG. 7B.

The connection portion 90 in the form of a finger strip gasket shown in FIG. 7A is formed of a plate spring-shaped conductive metal bent at a predetermined angle, and each finger 78 is integrally formed with a plurality of gaskets. It is fixed to the film support 82 to maintain electrical conductivity. When the finger strip gasket type connection portion 90 is assembled with the panel 60 and the case, the bending portion of the finger 78 is mechanically pressed to generate a contact force on the film support portion 82 and the metal bar 76.

The connection portion 92 in the form of a conductive foam shown in FIG. 7B includes an absorbing layer 96 and a conductive layer 94 formed to surround the absorbing layer 96. At least one surface of the conductive layer 94 is fixed to the film support 82 to maintain electrical conductivity. When the connection portion 92 in the form of the conductive foam is assembled with the panel 60 and the case, the absorbing layer 96 is mechanically pressed to generate a contact force on the film support 82 and the metal bar 76.

The front cover 86 is formed to surround the front outer portion of the film type front filter 80 to protect the panel 60 integrated with the film type front filter 80 from an external impact.

As described above, according to the front filter according to the present invention and the module of the display panel using the same, the case is grounded by a metal bar formed on the front surface of the film type front filter. By attaching a film type front filter to the panel, the weight and thickness of the entire panel can be reduced, and the surface temperature of the panel can be lowered. In addition, since it is not necessary to provide an anti-reflection film disposed between the filter and the panel, the contrast ratio can be improved and the assembly process of the filter can be simplified.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the technical spirit of the present invention. Therefore, the technical scope of the present invention should not be limited to the contents described in the detailed description of the specification but should be defined by the claims.

Claims (10)

In the front filter formed integrally with the display panel, An electromagnetic shielding film formed on an upper surface of the display panel and including conductive patterns for preventing electromagnetic emission from the display panel; An anti-reflection film for preventing the light incident from the outside on the electromagnetic shielding film from being reflected back to the outside; And a ground electrode formed on the electromagnetic shielding film along the periphery of the anti-reflection film so as to be connected to the electromagnetic shielding film. The method of claim 1, The ground electrode is formed of at least one of silver, gold, platinum, copper and aluminum. The method of claim 1, And the ground electrode is formed of a conductive tape. The method of claim 1, And a black frame on the display panel to determine an effective display area of the display panel. The method of claim 4, wherein And the ground electrode is formed to overlap the black frame with a relatively narrower width than the black frame. Display panel, A film type front filter attached to the front of the display panel and having a ground electrode protruding in a direction opposite to the display panel; A filter support for grounding the film type front filter to the rear cover; And a connection part attached to the filter support part and connected to the ground electrode of the film type front filter. The method of claim 6, And the connection portion is formed of a plate spring-shaped conductive metal bent at a predetermined angle. The method of claim 7, wherein The connecting portion And the conductive metal bent at the predetermined angle is connected to the ground electrode while being pressed by the pressure. The method of claim 6, And the connection part includes an absorption layer and a conductive layer formed to surround the absorption layer. The method of claim 9, And the conductive layer of the connection portion is compressed by being pressed by the absorbent layer and connected to the ground electrode.