KR20040085764A - Front-filter and adhering method thereof - Google Patents

Abstract

PURPOSE: A front filter and an adhering method thereof are provided to prevent formation of bubble during adhering of front filter to a plasma display panel, by forming micro-holes at the front filter. CONSTITUTION: A front filter(80) comprises an electromagnetic interference shielding film; an optical filter film for correcting optical characteristics; and a plurality of micro-holes(82) penetrating through the optical filter film and the electromagnetic interference film. The fine-holes are formed in a non-uniform manner through the entire area of the front filter. An adhering method of a front filter comprises a step of preparing a front filter including an optical filter film and an electromagnetic interference shielding film; a step of forming micro-holes through the front filter; and a step of adhering the front filter to a display panel.

Description

Front filter and its attachment method {FRONT-FILTER AND ADHERING METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front filter attached to a front surface of a display panel, and more particularly, to a front filter and a method of attaching the same, which can prevent a poor attachment or repair a poor attachment.

In general, the front surface of the display device for displaying an image is provided with a front filter for shielding the electromagnetic radiation emitted to the outside and to improve the optical characteristics. These front filters are classified into a glass front filter including a glass substrate and a film front filter from which the glass substrate is removed. The glass type front filter is usually mounted away from the front of the display device by a separate supporting member, but the film type front filter is attached to the front of the display device. By the way, when the film-type front filter is attached to the display device, there is a problem that adhesion failure occurs due to an air trap or a foreign matter. In particular, as the size of the display device increases, the adhesion failure of the film type front filter is frequently increased. Hereinafter, the problem of poor adhesion of the film type front filter will be described in detail using a plasma display panel (hereinafter, referred to as a PDP) that displays an image using gas discharge.

The PDP displays an image by adjusting the gas discharge period of each of the pixels according to the digital video data. As such a PDP, an AC type PDP having three electrodes and driven by an AC voltage is typical.

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.

This discharge cell is selected by the counter discharge between the data electrode 20 and the scan electrode 12A, and then sustains the discharge by the surface discharge between the pair of sustain electrodes 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.

In addition, the PDP includes a film type front filter 60 attached to the front surface of the PDP 30 for optical correction such as electromagnetic shielding, external light reflection prevention, near infrared shielding, and color correction. .

The film type front filter 60 shown in FIG. 2 includes a color correction film 68, a near infrared shielding film 66, an electromagnetic wave shielding film 64, and an anti-reflection film that are sequentially attached to the upper plate 15 of the PDP 30. 62).

The antireflection film 62 improves contrast by preventing the light incident from the outside from being reflected back to the outside. The electromagnetic wave shielding film 64 absorbs electromagnetic waves generated from the PDP 30 to shield the electromagnetic waves from being emitted to the outside. Near InfraRed shielding film 66 absorbs near-infrared rays of about 800-1000 nm wavelength band generated by PDP 30 to shield them from being radiated to the outside, thereby controlling infrared rays (about 947 nm) generated by a remote controller or the like. Allows normal input to the infrared receiver provided in the PDP set without interference. The color correction film 68 includes a color control dye (Color Dye) to increase the color purity by adjusting the color tone. The antireflection film 62, the electromagnetic wave shielding film 64, the near-infrared shielding film 66, and the color correction film 68 are attached to each other through an adhesive or an adhesive. The film type front filter 60 is adhesively attached to the surface to be attached to the PDP 30, and is supplied with release paper attached to the adhesively treated surface.

Accordingly, the release paper is peeled off from the supplied film front filter 60 before the film front filter 60 is attached to the PDP 30. Subsequently, the film type front filter 60 is attached to the front surface of the PDP 30 through a sticking or laminating process using a roller 72 as shown in FIG. 3. Referring to FIG. 3, the adhesive surface of the film type front filter 60 from which the release paper is removed faces the front surface of the PDP 30 and then presses from one side of the film type front filter 60 through the roller 72. While attaching to the front of the PDP (30).

In this case, air is trapped between the adhesive face of the film type front filter 60 and the PDP 30 as shown in FIG. 4, or as shown in FIG. 5. When foreign matter 78 is mixed on the adhesive surface, convex bubbles 74 and 76 are generated to cause adhesion failure. Bubbles 74 and 76 due to the poor adhesion of the film type front filter 60 are located on the front surface of the PDP 30, which causes the PDP set failure. In addition, a method for preventing the adhesion failure of the film type front filter 60 is required.

Accordingly, it is an object of the present invention to provide a film type front filter and a method for attaching the film type front filter which can prevent the adhesion failure of the film type front filter.

It is another object of the present invention to provide a film type front filter and a method for attaching the film type front filter which can repair the adhesion failure of the film type front filter.

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

2 is a cross-sectional view showing a vertical structure of a plasma display panel to which a conventional film type front filter is attached.

3 illustrates a method of attaching a conventional film type front filter to a plasma display panel.

4 is a view showing a poor adhesion state by the air trap of the conventional film-type front filter

5 is a view showing a poor adhesion state by the foreign matter of the conventional film type front filter.

6 is a plan view showing a front filter according to a first embodiment of the present invention;

7 is a plan view showing a front filter according to a second embodiment of the present invention.

8 is a flowchart sequentially illustrating a method of attaching a front filter according to a first embodiment of the present invention.

9 is a flowchart sequentially illustrating a method of attaching a front filter according to a second embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: upper substrate 12A: scanning electrode

12B: sustain electrode 14, upper dielectric layer

15: top plate 16: protective film

18: lower substrate 20: data electrode

22: lower dielectric layer 24: partition wall

26 phosphor 25: lower plate

30: PDP 40: glass type front filter

50: PCB 60: Case

70: cover 42: glass substrate

44, 48, 54: antireflection film 46, 64: electromagnetic shielding film

48, 66: near-infrared shielding film 52: color correction film

60, 80, 90: film type front filter 72: roller

74, 76: bubble 78: foreign matter

82, 92: microholes 95: mesh pattern area

97: frame area

In order to achieve the above object, the film-type front filter according to the present invention comprises a front filter attached to the front surface of the display panel, an electromagnetic shielding film for shielding electromagnetic waves; At least one optical filter film for correcting optical characteristics; And a plurality of micro holes formed through the at least one optical filter film and the electromagnetic shielding film.

The micro holes are irregularly formed over the entire area of the front filter.

The micro holes may be irregularly formed in a specific area overlapping the conductive patterns provided in the electromagnetic shielding film.

The adhesion surface to be attached to the display panel may be adhesively attached, and further comprising release paper attached to the adhesively treated surface.

The fine holes are characterized in that formed through the release paper.

The at least one optical filter film includes an anti-reflection film to prevent reflection of external light; And a near infrared shielding film for shielding near infrared rays.

The near-infrared shielding film may further include a dye for color correction.

According to an aspect of the present invention, there is provided a method of attaching a front filter comprising: providing a front filter including at least one optical filter film and an electromagnetic shielding film; Forming fine holes in the front filter; And attaching the front filter on which the micro holes are formed, to the display panel.

The forming of the microholes may include irregularly forming the entire area of the front filter.

The forming of the microholes may include irregularly forming a specific region in the front filter in a specific region overlapping the conductive pattern of the electromagnetic shielding film.

And removing the release paper attached to the adhesively treated surface of the front filter before or after the forming of the fine holes.

The attaching the front filter to the display panel may include opposing an adhesive surface of the front filter to the display panel, and then partially pressing the front filter using a roller to attach the front filter to the display panel. And discharging the trapped air between the front filter and the display panel through the micro holes.

According to another aspect of the present invention, there is provided a method of attaching a front filter comprising: providing a front filter including at least one optical filter film and an electromagnetic shielding film; Attaching the front filter to the display panel; Forming fine holes in the front filter attached to the display panel.

The method may further include peeling off the release paper attached to the adhesive-treated surface of the front filter before attaching the front filter to the display panel.

The forming of the microholes may include irregularly forming the entire area of the front filter.

The forming of the microholes may include irregularly forming a specific region in the front filter in a specific region overlapping the conductive pattern of the electromagnetic shielding film.

The forming of the microholes may include forming the microholes only in a region where bubbles are formed in the front filter attached to the display panel.

After forming the micro holes, the front surface of the front filter attached to the display panel is pressurized using any one of a roller or compressed air to discharge air trapped between the front filter and the display panel through the micro holes. It characterized in that it further comprises the step of.

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. 6 to 9.

6 is a plan view illustrating a film front filter according to a first embodiment of the present invention, and FIG. 7 is a plan view showing a film front filter according to a second embodiment of the present invention.

The film type front filter 80 illustrated in FIG. 6 includes micro holes 82 irregularly formed to prevent adhesion failure. The fine holes 82 are irregularly formed by using a mold or the like after the film-type front filter 80 is manufactured so that air may escape when the film-type front filter 80 is attached and is not visible. For example, the microholes 82 are formed in micro or nano size.

In contrast, the film type front filter 90 illustrated in FIG. 7 includes fine holes 92 irregularly formed only in a specific area. This is to prevent the microholes 92 from being visually interrupted by the visible light transmission from the PDP, and is formed only in the region 95 where the mesh type conductive pattern of the electromagnetic shielding film included in the film type front filter 90 is formed. do. In addition, the fine holes 92 are additionally formed in the frame formation region 97 positioned at the outer portion of the fine hole 92 to support the mesh type conductive pattern 95 in the electromagnetic shielding film. The mesh type conductive pattern and the frame are usually formed of an opaque metal such as copper (Cu), silver (Ag), or the like. Accordingly, when the micro holes 92 through which air may escape may be formed in the area where the mesh type conductive pattern and the frame are formed, it may be prevented from being visually seen.

In the film type front filters 80 and 90 illustrated in FIGS. 6 and 7, the PDP performs an electromagnetic shielding function and an optical characteristic correction function such as external light reflection prevention, near infrared shielding, and color correction. To this end, the film type front filters 80 and 90 have a color correction film, a near infrared shielding film, an electromagnetic shielding film, and an antireflection film as described above.

The anti-reflection film improves contrast by preventing light incident from the outside from being reflected back to the outside. The electromagnetic shielding film absorbs electromagnetic waves generated from the PDP and shields the electromagnetic waves from being emitted to the outside. The near-infrared shielding film absorbs near-infrared rays of about 800-1000 nm wavelength band generated from the PDP and shields them from radiating to the outside so that the infrared rays generated by the remote control can be normally input to the infrared receiver provided in the PDP set without interference of the near-infrared rays. The color correction film includes a color control dye to increase color purity by adjusting the color tone. Here, the near-infrared shielding film and the color correction film may be composed of one thin film including a near-infrared absorber and a color control dye. The antireflection film, the electromagnetic wave shielding film, the near infrared shielding film, and the color correction film are attached to each other through an adhesive or an adhesive. Then, the film type front filter (80, 90) is adhesively attached to the adhesion surface to be attached to the PDP, the release paper is attached to the adhesively treated surface is supplied.

The micro holes 82 and 92 in the film front filter 80 and 90 having such a configuration are formed before attaching the film front filter 80 and 90 to the PDP to prevent poor adhesion or after attachment. It can be formed in the to repair the adhesion failure.

Referring to Figure 8, in step 1 (S1) to prepare the film-type front filter (80, 90) supplied with no micro holes are formed, then in step 2 (S2) using a mold for forming a fine hole, etc. Fine holes 82 and 92 are formed. In this case, the micro holes 82 and 92 are irregularly formed over the entire area of the film type front filter 80 as shown in FIG. 6, or the film type front filter 90 as shown in FIG. 7. It is formed only in a specific region of the region, that is, the region in which the conductive pattern for electric wave shielding is formed. These microholes 82 and 92 are adhesive surfaces of the film front filters 80 and 90 in the step of manufacturing the film front filters 80 and 90 before the film front filters 80 and 90 are supplied. It is formed after attaching the release paper to the film, or before the attaching process in the step of attaching the supplied film type front filters 80 and 90 to the PDP.

Subsequently, in step 3 (S3), the release paper adhered to the adhesive surface of the film type front filter 80 or 90 having the fine holes 82 and 92 formed thereon, and then sticking using a roller as described above. Or the laminating process to attach the film type front filters 80 and 90 to the front surface of the PDP. In this case, air trapped between the film type front filters 80 and 90 and the PDP is released through the micro holes 82 and 92 by the pressure of the roller, thereby preventing adhesion failure such as bubble formation. .

Meanwhile, the micro holes 82 and 92 may be formed after peeling off the release paper from the film type front filters 89 and 90.

9, in step 11 (S11) to prepare the film-type front filter (80, 90) supplied with no micro holes formed.

Next, in step 12 (S12), the release paper adhered to the adhesive surfaces of the film-type front filters 80 and 90 where no micro holes are formed, and then peeling or laminating using a roller as described above. Through the laminating process, the film type front filters 80 and 90 are attached to the front surface of the PDP.

Subsequently, the fine front holes 80 and 90 are formed by forming the fine holes 82 and 92 only in the film front filters 80 and 90 attached to the PDP using the fine hole forming mold or the like in step 13 (S13). ), And removes bubbles due to air traps or foreign substances between the PDP and the PDP. In this case, the micro holes 82 and 92 are irregularly formed over the entire area of the film type front filter 80 as shown in FIG. 6, or the film type front filter 90 as shown in FIG. 7. It is formed only in a specific region of the region, that is, the region in which the conductive pattern for electric wave shielding is formed. Alternatively, the micro holes 82 and 92 may be formed only in a portion where bubbles are formed by an air trap or a foreign substance in the film type front filters 80 and 90 attached to the PDP.

In addition, the roller used in the attachment process of the film type front filter (80, 90) to effectively discharge the air trapped between the film type front filter (80, 90) and the PDP through the fine holes (82, 92) In addition, the front surface of the film type front filters 80 and 90 may be pressurized using compressed air.

As described above, the front filter according to the present invention and its attachment method form micro holes that are not visible to the front filter so that when the front filter is attached to the PDP, bubbles due to air traps or foreign matters are formed. Can be prevented.

In addition, the front filter according to the present invention and the method for attaching the front filter are attached by removing air bubbles or foreign matter bubbles between the front filter and the PDP by attaching the front filter to the PDP and then forming micro holes which are not visible only to the front filter. The defect can be repaired.

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 (18)

In the front filter attached to the front of the display panel, An electromagnetic shielding film for shielding electromagnetic waves; At least one optical filter film for correcting optical characteristics; And a plurality of micro holes formed through the at least one optical filter film and the electromagnetic shielding film. The method of claim 1, The micro holes are The front filter, characterized in that formed irregularly over the entire area of the front filter. The method of claim 1, The micro holes are The front filter, characterized in that formed irregularly in a specific region overlapping the conductive patterns provided in the electromagnetic shielding film. The method of claim 1, And an attaching surface to be attached to the display panel, and further comprising a release paper attached to the adhesively treated surface. The method of claim 2, And the fine holes penetrate through the release paper. The method of claim 1, The at least one optical filter film An anti-reflection film for preventing reflection of external light; A front filter comprising a near infrared shielding film for shielding near infrared rays. The method of claim 6, The near-infrared shielding film further comprises a color correction dye. Providing a front filter including at least one optical filter film and an electromagnetic shielding film; Forming fine holes in the front filter; And attaching the front filter on which the microholes are formed to a display panel. The method of claim 8, Forming the micro holes And irregularly forming the entire area of the front filter. The method of claim 8, Forming the micro holes And irregularly forming a specific area in the front surface filter overlapping the conductive pattern of the electromagnetic wave shielding film. The method of claim 8, The method of claim 1, further comprising peeling off the release paper attached to the adhesive surface of the front filter before or after forming the fine holes. The method of claim 8, Attaching the front filter to the display panel After the adhesive surface of the front filter faces the display panel, the front filter is partially pressed by using a roller to attach the front filter to the display panel, and the front filter and the display panel are formed through the microholes. And discharging the trapped air therebetween. Providing a front filter including at least one optical filter film and an electromagnetic shielding film; Attaching the front filter to the display panel; And forming fine holes in the front filter attached to the display panel. The method of claim 13, The method of claim 1, further comprising peeling off the release paper attached to the adhesive surface of the front filter prior to attaching the front filter to the display panel. The method of claim 13, Forming the micro holes And irregularly forming the entire area of the front filter. The method of claim 13, Forming the micro holes And irregularly forming a specific area in the front surface filter overlapping the conductive pattern of the electromagnetic wave shielding film. The method of claim 13, Forming the micro holes And forming the micro holes only in a region where bubbles are formed in the front filter attached to the display panel. The method of claim 13, After forming the micro holes, the front surface of the front filter attached to the display panel is pressurized using any one of a roller or compressed air to discharge air trapped between the front filter and the display panel through the micro holes. And attaching the front filter.