KR100867265B1 - Method for preparing emi shielding film and emi shielding film prepared by the method - Google Patents

Abstract

The present invention provides a method for manufacturing an electromagnetic shielding film and an electromagnetic shielding film produced by applying a transparent resin over the entire upper surface of the electromagnetic shielding film having a conductive pattern portion formed on at least a portion thereof. To provide. And it provides an optical filter and display device including the electromagnetic shielding film.

Display panel, optical filter, electromagnetic shielding film, transparent layer

Description

Method for manufacturing electromagnetic shielding film and electromagnetic shielding film manufactured by the same {METHOD FOR PREPARING EMI SHIELDING FILM AND EMI SHIELDING FILM PREPARED BY THE METHOD}

1 is a cross-sectional view of an optical filter according to an embodiment of the present invention;

2 is a cross-sectional view of the electromagnetic shielding film according to an embodiment of the present invention,

3 is a plan view of the electromagnetic shielding film shown in FIG.

4 is a plan view showing a state in which a transparent layer and a ground portion are formed in the electromagnetic shielding film shown in FIG. 3;

5 is a manufacturing process diagram of an optical filter according to an embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10: near infrared shielding film 20: color correction film

30: electromagnetic shielding film 31: base layer

32: conductive pattern portion 33: frame

40: transparent layer 50: ground portion

51: adhesive 60: antireflection film

100: first feed roller 110: coating roller

120: coating head 130: first pressing roller

140: second pressing roller 150: second feed roller

160: optical filter winding roller

The present invention provides a method of manufacturing an electromagnetic shielding film for forming a transparent layer by applying a transparent resin over the entire upper surface of the electromagnetic shielding film having a conductive pattern portion formed on at least a portion of the electromagnetic shielding film, and the electromagnetic shielding film produced thereby, and the electromagnetic wave An optical filter and a display device including a shielding film.

In general, a display device is a general term for a TV or a computer monitor, and includes a display module having a display panel for forming an image and a casing for supporting the display module.

The display module is a display panel such as a cathode ray tube (CRT), a liquid crystal display (LCD) and a plasma display panel (PDP) forming a picture, a driving circuit board for driving the display panel, and an optical device disposed in front of the display panel. Include a filter.

The optical filter includes an anti-reflection film that prevents external light incident from the outside from being reflected back to the outside, a near-infrared shielding film that shields near-infrared rays generated from the display panel to prevent malfunction of electronic devices such as a remote control, and a color control dye. It includes a color correction film to increase the color purity by adjusting the color tone and an electromagnetic shielding film for shielding the electromagnetic waves generated in the display panel when driving the display device.

Here, the electromagnetic shielding film is composed of a resin layer, a mesh-shaped conductive pattern portion which is an etching portion formed by the photolithography method and etching after attaching a metal thin film on the resin layer, and a frame which is a non-etching portion.

As such, the conductive pattern portion having the groove portion and the protrusion is formed on the upper portion of the electromagnetic shielding film, so that the other functional film (ex. Antireflection film, near infrared shielding film, color) is formed on the upper portion of the electromagnetic shielding film on which the conductive pattern portion and the frame are formed. When one of the correction films) is bonded, the electromagnetic shielding film and the other functional film are not sufficiently in close contact with each other, and a fine air layer is formed by the groove of the electromagnetic shielding film.

As light is scattered by the micro air layer, it is difficult to realize a clear image quality, and thus, after bonding the two films, the micro air layer must be removed through a transparent process. In this case, the transparency means that the light is scattered by the fine air layer so that the image quality is not clear and is somewhat broken, by filling the fine air layer with a transparent resin to make the fine air layer transparent, thereby providing clear image quality. do.

An example of the transparent process that makes another surface smooth by attaching another functional film on top of the electromagnetic shielding film on which the conductive pattern is formed. Transparent by directly coating a solution-type resin on the conductive pattern portion to fill the gap due to the groove and protrusion of the conductive pattern portion. How to do this.

When transparent using this method, the frame, which is the non-etching portion, must have electrical conductivity to the ground area for shielding electromagnetic waves. Therefore, only the groove portion of the conductive pattern portion, which is the etching portion, should be filled with resin, and the resin, which is not etching portion, should not be coated.

That is, the frame provided in the circumferential region of the conductive pattern portion, when bonding the functional film to the electromagnetic shielding film or filling the groove portion of the conductive pattern portion with a resin, all should be exposed to the outside without covering.

For this reason, the method of coating the resin and making it transparent is possible only an intermittent coating method in which the resin should be coated only on the necessary conductive pattern parts, and cannot be applied to a roll process that continuously performs the process by providing it in the form of a roll. Has the disadvantage of being very limited.

In addition, since the resin may not be sufficiently coated on the conductive pattern portion during the intermittent coating described above or may be excessively coated, there is a problem that the adjustment of coating precision is very difficult.

Accordingly, an object of the present invention is a method of manufacturing an electromagnetic shielding film for forming a transparent layer by applying a transparent resin over the entire upper surface of the electromagnetic shielding film having a conductive pattern portion formed in at least a partial region and the electromagnetic shielding film produced thereby And to provide an optical filter and display device comprising the electromagnetic shielding film.

In order to achieve the above object, one embodiment of the present invention is an electromagnetic shielding film, characterized in that to form a transparent layer by applying a transparent resin over the entire upper surface of the electromagnetic shielding film having a conductive pattern portion formed in at least a partial region. It provides a method of manufacturing.

Another embodiment of the invention is a base layer; An electromagnetic shielding layer provided on the base layer and having conductive patterns formed in at least a partial region; It provides an electromagnetic shielding film comprising a transparent layer formed by the above-described method.

Another embodiment of the present invention provides an optical filter comprising the above-mentioned electromagnetic shielding film.

Another embodiment of the present invention comprises the steps of applying a transparent resin over the entire upper surface of the electromagnetic shielding film having a conductive pattern portion formed in at least a partial region to form a transparent layer; It provides a method for producing an optical filter comprising the step of laminating one or more functional film on the electromagnetic shielding film is formed with the transparent layer.

Another embodiment of the present invention comprises the steps of: mounting a winding roll, the electromagnetic wave shielding film is formed with a conductive pattern portion in at least one region on the first supply roller; Mounting the take-up roll on which the functional film is wound to the second feed roller; The electromagnetic shielding film is transferred between the coating roller and the coating head spaced apart from each other by using the first feed roller, and then the transparent resin is spread over the entire upper surface of the electromagnetic shielding film between the coating roller and the coating head. Applying a to form a transparent layer; Passing the functional film supplied from the electromagnetic shielding film and the second supply roller having the transparent layer formed by the coating roller between the first and second compression rollers spaced apart from each other to pass the functional film on the transparent layer. It provides a method for producing an optical filter comprising the step of laminating.

And another embodiment of this invention provides the optical filter manufactured by the manufacturing method mentioned above.

In addition, another embodiment of the present invention is a display panel; It provides a display device comprising the above-described optical filter stacked on the display panel.

Hereinafter, as an embodiment of the present invention, a transparent method of an electromagnetic shielding film will be described in detail.

The electromagnetic shielding film includes a transparent base layer and an electromagnetic shielding layer provided on the base layer.

The base layer is a material having excellent light transmittance, and may be manufactured using at least one selected from polyacryl, polyurethane, polyester, polyepoxy, polyolefin, polycarbonate, and cellulose, and is made of transparent PET terephthalate).

The electromagnetic shielding layer may be formed of any one of copper, silver, gold, iron, nickel, and aluminum and alloys thereof, and preferably, copper.

The electromagnetic shielding layer may be provided in the form of a conductive pattern portion in which an entire surface of the metal thin film is etched after attaching the above-described metal thin film on the base layer, and the etching portion is partially etched without etching the entire surface of the metal thin film. It may be provided in a form distinguished by the conductive pattern portion and the frame which is the remaining non-etching portion.

Here, when the electromagnetic shielding layer is composed of a conductive pattern portion and a frame, it is preferable that the conductive pattern portion is provided in a mesh form having protrusions and grooves, and the frame surrounds the conductive pattern portion to surround the conductive pattern portion. To be prepared.

In the electromagnetic shielding film having such a structure, a transparent step of applying a transparent resin over the entire upper surface of the electromagnetic shielding film so as to fill the groove portion of the conductive pattern portion so that the upper region of the electromagnetic shielding film having the conductive pattern portion is flattened. A transparent layer is formed on the electromagnetic shielding film through. When the transparent layer is formed, the groove part is filled with the transparent resin, and the space inside the groove part becomes transparent, so that light is scattered by air in the groove part, so that the image quality is not clear and looks somewhat crushed, thereby providing clear image quality. .

In the transparent step, the transparent resin is applied over the entire upper surface of the electromagnetic shielding film. At this time, the transparent resin is applied to the upper surface of the frame and the upper surface of the protrusion of the conductive pattern part, and the groove is filled up to the groove of the conductive pattern part. After this coating step, it is cured to form a transparent layer on top of the electromagnetic shielding film.

The transparent resin can be selected from among crosslinked resins, thermosetting resins and ultraviolet curing resins. Examples thereof include polyacrylic, polyurethane, polyester, polyepoxy, polycarbonate, polyolefin, polysulfone and polyvinyl chloride resins.

In addition, one or more of the near infrared absorbing dye and the color control dye may be added to the transparent resin to add the near infrared absorption and / or color adjusting function to the transparent layer.

When the transparent layer is formed on the upper portion of the electromagnetic shielding film through the above-described process, the transparent layer is formed on the transparent layer for grounding of the electromagnetic shielding layer formed only by the conductive pattern portion by etching over the entire surface or by partially etching the electromagnetic shielding layer composed of the conductive pattern portion and the frame. The grounding portion may be further provided.

The ground portion may be provided by attaching a conductive tape to the upper peripheral region of the transparent layer, or may be provided by applying a conductive paste to the upper peripheral region of the transparent layer.

The conductive tape may be provided in the form of a fabric coated with metals such as nickel, copper, aluminum, and gold, and the conductive paste may be prepared by dispersing silver or copper powder in a polymer binder and a solvent.

Here, in the case of the electromagnetic shielding layer formed only by the conductive pattern portion by etching over the entire area, the ground portion is disposed corresponding to the edge region of the conductive pattern portion.

In the case of the electromagnetic shielding layer which is partially etched and composed of the conductive pattern portion and the frame, the ground portion is disposed corresponding to the frame located at the edge region of the conductive pattern portion.

Therefore, the transparent layer may be provided to have a thickness of more than 0 μm and less than 30 μm based on the protruding surface of the conductive pattern part for smooth energization between the ground portion and the edge region of the conductive pattern portion or smooth conduction of the ground portion and the frame. And, it may be provided to have a thickness of more than 0㎛ 15㎛ or less.

Here, the conductive particles may be added to the transparent layer so that the energization can be made more smoothly. As the conductive particles, metal powder such as silver or copper, carbon black, carbon or notube (CNT) may be used.

Hereinafter, as another embodiment of the present invention, a method of manufacturing an optical filter using the above-mentioned method for transparentizing an electromagnetic shielding film will be described.

The optical filter includes one or more other functional films other than the above-described electromagnetic shielding film and electromagnetic shielding film for shielding electromagnetic waves generated from a display panel (not shown).

Functional films include color correction dyes, including color-control dyes, to enhance color purity, near-infrared shielding films that shield near-infrared rays from display panels to prevent malfunction of electronic devices such as remote controls, and external light incident from the outside. One or more films selected from antireflection films that prevent reflection back to the outside may be used, or a functional film having two or more functions among those functions may be used. Here, the stacking order of the color correction film, the near-infrared shielding film and the anti-reflection film may be variously changed.

The optical filter having such a configuration is manufactured through the step of laminating the above-described functional film on the transparent layer after the transparentization step of forming a transparent layer on the above-mentioned electromagnetic shielding film.

As such, one or more functional films may be laminated on the transparent layer, and another one or more functional films may be laminated on the bottom surface of the base layer of the electromagnetic shielding film.

Hereinafter, as another embodiment of this invention, it demonstrates concretely by applying the manufacturing method of the above-mentioned optical filter to a continuous roll process.

Mounting the winding roll on which the electromagnetic shielding film composed of the electromagnetic shielding layer and the base layer is wound on the first supply roller before performing the above-mentioned transparentizing step of forming the transparent layer on top of the electromagnetic shielding film; A step of mounting the winding roll on which the functional film to be attached to the transparent layer of the electromagnetic shielding film is attached to the second supply roller is first performed.

Next, the step of transferring the electromagnetic shielding film of the first feed roller between the coating roller and the coating head spaced apart from each other.

Then, after performing the above-described transparent film of the electromagnetic shielding film between the coating roller and the coating head, the first film spaced apart from the electromagnetic shielding film and the functional film supplied from the second supply roller is formed with a transparent layer conveyed by the coating roller. Passing between the pressing roller and the second pressing roller to perform a step of laminating a functional film on the transparent layer.

Another functional film may be laminated by repeating the above-described lamination step, and in addition, another functional film may be laminated on the bottom surface of the base layer of the electromagnetic shielding film.

Meanwhile, after the functional film is laminated on the transparent layer, the above-described grounding part may be formed on the transparent layer.

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

As shown in Figure 1, the optical filter according to an embodiment of the present invention, the electromagnetic shielding film 30 for shielding the electromagnetic waves generated in the display panel (not shown) when driving the display device (not shown), At least one other functional film other than the electromagnetic shielding film 30 is included.

As the functional film, a color correction film 10 for enhancing color purity by adjusting color tones including color control dyes, a near infrared shielding film 20 for shielding near infrared rays generated from a display panel to prevent malfunction of electronic devices such as a remote control, and It may be one or more selected from the anti-reflection film 60 to prevent the external light incident from the outside is reflected back to the outside. Here, the stacking order of the color correction film 10, the near-infrared shielding film 20 and the anti-reflection film 60 is not limited thereto, and may be variously changed. The above-described functional film may be coated with a pressure-sensitive adhesive 51 for adhesion in advance.

As illustrated in FIGS. 2 and 3, the electromagnetic shielding film 30 includes a transparent base layer 31 and electromagnetic shielding layers 32 and 33 provided on the base layer 31.

The base layer 31 is made of a material having excellent light transmittance, and is made of transparent polyethylene terephthalate (PET), and the electromagnetic shielding layers 32 and 33 are made of copper.

The electromagnetic shielding layers 32 and 33 are mesh-shaped conductive pattern portions 32 located in the center region of the base layer 31, and conductive pattern portions 32 are disposed in the circumferential region of the conductive pattern portions 32. And a frame 33 for supporting).

When the copper thin film is attached to the base layer 31 using an adhesive and then etched, the copper thin film is formed of the conductive pattern portion 32 serving as the etching portion and the frame 33 serving as the non-etching portion.

In the electromagnetic shielding film 30 having such a configuration, an upper portion is formed on the electromagnetic shielding layers 32 and 33 so as to fill the groove portion of the conductive pattern portion 32 and flatten the upper regions of the electromagnetic shielding layers 32 and 33. The transparent layer 40 which covers the whole surface is provided. In addition, a ground portion 50 formed by attaching the conductive tape 50 along the circumferential direction is provided on the upper surface of the transparent layer 40 so as to be disposed at a position corresponding to the frame 33.

The transparent layer 40 is prepared by applying one selected from a transparent crosslinkable resin, a thermosetting resin, and an ultraviolet curable resin over the entire upper surface of the electromagnetic shielding layers 32 and 33. As a result, a flat transparent layer 40 is formed on the electromagnetic shielding layers 32 and 33 in a state where the groove portion of the conductive pattern portion 32 is filled.

The thickness of the transparent layer 40 is preferably greater than 0 and less than 15 μm based on the upper surface of the frame 33 for smooth energization of the frame 33 and the grounding part 50.

Since the conductive tape forming the ground portion 50 is made of a material that can conduct electricity with the frame 33, the electromagnetic waves guided to the frame 33 are smoothly conducted to the ground portion 50.

Here, the ground unit 50 is grounded to a casing (not shown) of the display device by a separate means. Electromagnetic waves It is blocked by the conductive pattern portion 32 in the form of a mesh to exit through the ground portion 50 of the frame 33.

Hereinafter, a manufacturing method of an optical filter having such a configuration will be described with reference to FIG. 5.

In the method of manufacturing an optical filter according to an embodiment of the present invention, the transparent layer 40 is formed by applying a transparent resin to the entire upper surface of the electromagnetic shielding film 30 having the electromagnetic shielding layers 32 and 33 formed thereon. step; Laminating a functional film on the transparent layer 40.

In the step of forming the transparent layer 40, when the electromagnetic shielding film 30 is transferred from the first supply roller 100 and positioned between the coating roller 110 and the coating head 120, the electromagnetic shielding film 30 The entire surface is coated with a transparent resin using the coating head 120.

Before the transparent layer 40 is formed, the first supply roller 100 includes a winding roll (not shown) in which the electromagnetic shielding film 30 composed of the electromagnetic shielding layers 32 and 33 and the base layer 31 is wound without the transparent layer. Mounting step; A step of mounting a winding roll (not shown) on which the functional film to be attached to the transparent layer 40 of the electromagnetic shielding film 30 is attached to the second supply roller 150 may be further provided.

In the stacking of the functional film, the first compression roller 130 spaced apart from the functional film supplied from the electromagnetic shielding film 30 and the second supply roller 150 in which the transparent layer 40 is transferred from the coating roller 110. ) And the second compression roller 140 to pass through the functional film is laminated on the transparent layer 40 of the electromagnetic shielding film 30. After such a laminating step, the optical filter winding roll 160 may be wound up.

Here, the functional film includes a color correction dye, a color correction film that increases color purity by adjusting color tone, a near infrared shielding film that shields near infrared rays generated from the display panel to prevent malfunction of electronic devices such as a remote control, and incident light from outside. It can be used by selecting from the anti-reflection film to prevent the external light is reflected back to the outside. When the above-described lamination step is repeated by selecting among the functional films, as illustrated in FIG. 1, the functional films 10, 20, and 60 are formed on the upper surface of the transparent layer 40 and the lower surface of the base layer 31. ) Can be stacked.

Meanwhile, after the antireflection film 60 is laminated on the transparent layer 40 among the functional films 10, 20, and 60, as shown in FIGS. 1 and 4, the transparent layer 40 of the electromagnetic shielding film 30 is provided. It may be further provided to form a ground portion 50 in the circumferential direction.

In the forming of the grounding part 50, the conductive tape is attached to the upper circumferential region of the transparent layer 40 so as to correspond to the frame 33 of the electromagnetic shielding film 30 to prepare the grounding part 50.

Accordingly, when the antireflection film 60 having the adhesive 51 coated on one side thereof is laminated on the transparent layer 40 according to the above-described method of laminating the functional film, the antireflection film 60 may be formed by the adhesive 51. 40, the ground part 50 is formed on the transparent layer 40 in this state, and as shown in FIGS. 1 and 4, the ground part 50 is formed on the transparent layer 40. 60) is provided along the circumferential direction with the center.

As such, according to the above-described manufacturing method, since each step is made on a roll-to-roll process, in particular, as the transparent step of coating the transparent resin over the entire upper surface of the electromagnetic shielding film is made on the roll-to-roll process Unlike the conventional transparent method that used the intermittent coating method, the productivity is remarkably improved.

As described above, according to the present invention, the transparent resin is coated over the entire upper surface of the electromagnetic shielding film in which the conductive pattern portion is formed in at least one region, so that the transparent process can be easily performed, and separate difficult coating precision control Since this is not required, productivity is improved, and product defects due to the failure to adjust the coating precision can be prevented, thereby providing a high quality product.

Claims (13)

Forming a transparent layer by applying a transparent resin over the entire upper surface of the electromagnetic shielding film having a conductive pattern portion formed on at least a partial region; And Method of manufacturing an electromagnetic shielding film comprising the step of providing a grounding portion on the transparent layer. delete The method of claim 1, The grounding part is a method of manufacturing an electromagnetic shielding film, characterized in that provided by any one of the method of applying a conductive tape to the upper peripheral region of the transparent layer and a method of applying a conductive paste to the upper peripheral region of the transparent layer. . The method of claim 1, The thickness of the transparent layer is a manufacturing method of the electromagnetic shielding film, characterized in that more than 0㎛ 30㎛ less based on the projection surface of the conductive pattern portion. The method of claim 1, The transparent resin is a method of manufacturing an electromagnetic shielding film, characterized in that selected from crosslinking resins, thermosetting resins and ultraviolet curing resins. The method of claim 1, Method for producing an electromagnetic shielding film, characterized in that for adding at least one of a near infrared absorbing dye and a color control dye to the transparent resin. The method of claim 1, Method for producing an electromagnetic shielding film, characterized in that the conductive particles are added to the transparent resin. Base layer; An electromagnetic shielding layer provided on the base layer and having conductive patterns formed in at least a partial region; A transparent layer formed by applying a transparent resin over the entire upper surface of the electromagnetic shielding layer; And Electromagnetic shielding film comprising a grounding portion provided on the transparent layer. delete The method of claim 8, The electromagnetic shielding layer is composed of the conductive pattern portion and a frame provided in the peripheral region of the conductive pattern portion, The grounding portion is characterized in that the electromagnetic shielding film is provided along the circumferential direction on the transparent layer to be disposed in a position corresponding to the frame. An optical filter comprising the electromagnetic shielding film according to claim 8. The method of claim 11, Optical filter, characterized in that it further comprises at least one functional film laminated on the electromagnetic shielding film. A display panel; A display apparatus comprising the electromagnetic shielding film according to claim 8 or 10 laminated on the display panel.

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