KR20080087977A - Optical member against electro magnetic interference, filter for display apparatus having the same and display apparatus having the same - Google Patents

Abstract

An optical member for shielding electro-magnetic interference, a filter for a display apparatus having the same and a display apparatus having the same are provided to effectively shield the electro-magnetic interference with a single layer without stacking a plurality of layers. A filter(200) for a display apparatus is formed by stacking a plurality of functional members. Any one of the functional members includes an electric-magnetic interference shielding layer(240) having a base substrate(242) and a conductive polymer layer(244). The conductive polymer layer is coated on the base substrate and includes a conductive polymer and a dopant. The filter for the display apparatus includes an external light shielding layer(220). The conductive polymer layer is coated on one surface of the base substrate and the external light shielding layer is positioned on the other surface of the base substrate.

Description

Optical member against electro magnetic interference, filter for display apparatus having the same and display apparatus having the same}

1 is an exploded perspective view showing a PDP apparatus according to an embodiment of the present invention.

2 is a cross-sectional view illustrating a PDP filter according to an embodiment of the present invention.

3 is a graph showing the electromagnetic shielding efficiency of the electromagnetic shielding optical member prepared in Example 1.

[Description of Major Symbols in Drawing]

100: PDP device 110: case

120: drive circuit board 130: panel assembly

140: PDP filter 150: cover

200: PDP filter 210: antireflection layer

220: external light shielding layer 222: support

224: base material 226: wedge black stripe

230: color correction layer 240: external light shielding layer

242: base substrate 244: conductive polymer layer

310: external ambient light 320: incident light

The present invention relates to an electromagnetic wave shielding optical member, a display device filter including the same, and a display device including the same, and more particularly, an electromagnetic wave having a conductive polymer layer including a conductive polymer and a dopant on a base substrate. A shielding optical member, a filter for a display device including the same, and a display device including the same.

In general, a plasma display panel (PDP) is an image display device that displays an image by using plasma generated by gas discharge.

 The PDP can be made larger and thinner than conventional cathode ray tubes (CRTs), and has attracted much attention as a next-generation video display device because of its excellent display capabilities such as display capacity, brightness, contrast, afterimage and viewing angle. .

The PDP device generates a discharge in the gas between the electrodes by a direct current or an alternating voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet rays accompanying the light, thereby emitting light. Since the PDP device has a large amount of emission of electromagnetic waves and near infrared rays due to its driving characteristics, the PDP device may adversely affect the human body by the generated electromagnetic waves and near infrared rays, or may cause malfunction of precision devices such as a wireless telephone or a remote controller.

Accordingly, the PDP device is required to suppress the emission of electromagnetic waves and near-infrared radiation below a predetermined value. For this purpose, a filter for PDP for shielding electromagnetic waves and near-infrared rays has been developed.

The filter for shielding electromagnetic waves may be classified into a metal mesh type and a transparent conductive film type.

First, as the metal mash type, a ground metal mash, or a metal coating of a synthetic resin or metal fiber may be used. The metal constituting the conductive mash may include a metal mash in terms of price, electrical conductivity, and processability. Copper and nickel are mainly used.

As an example, a method of manufacturing a copper mesh may include first laminating copper on an entire surface of a polyethylene terephthalate (Poly) terephthalate (Poly) film, on the thermo-compressed copper-PET film. Applying a photoresist (PR), baking the PR, mounting a mask on the PR, and UV exposure of the PR equipped with the mask Dry etching the copper masked with the PR, developing a mesh pattern on the PR to form a mesh type conductive filter, removing the PR, and cleaning the PR. Complex processes such as these are required.

In addition, the metal mash type exhibits excellent characteristics in shielding electromagnetic waves, but may have relatively low transparency or distortion of the screen, and the price of the overall product may increase because the mash itself is expensive.

As the transparent conductive film, a multilayer thin film in which a high refractive index transparent conductive film represented by indium tin oxide (ITO) and a metal thin film are alternately laminated several times is mainly used. As the high refractive index transparent thin film, indium tin oxide, indium oxide, second tin oxide, zinc oxide, or the like is used, and as the metal thin film, silver (Ag) or an alloy mainly containing silver is mainly used.

In this case, since only the high refractive index transparent thin film has relatively low reflectivity of conductivity or near infrared rays, the high refractive index transparent thin film and the metal thin film are generally stacked together several times and used as a multilayer thin film.

However, in the case of the multilayer thin film, while the transmittance of near infrared rays can be minimized, the transmittance of visible light is rather reduced. In addition, since the metal thin film layer is repeatedly stacked and used as described above, the size of the coating equipment is increased, material costs and production costs are increased, and overall process time is also long.

Therefore, it is necessary to develop an electromagnetic shielding filter for PDP that can simplify the process and lower the production cost while maintaining the electromagnetic shielding efficiency.

An object of the present invention is to solve the above problems, and in detail, to simplify the manufacturing process of the conventional electromagnetic shielding optical member, while lowering the production cost, the electromagnetic shielding optical member that can maintain a high electromagnetic shielding efficiency. To provide.

Another object of the present invention is to provide a filter for a display device comprising the optical member for shielding electromagnetic waves.

Still another object of the present invention is to provide a display device including the filter for the display device.

The electromagnetic shielding optical member according to an aspect of the present invention includes a base substrate and a conductive polymer layer coated on the base substrate and having a conductive polymer and a dopant.

The base substrate is a substrate whose surface is modified by plasma treatment, and the base substrate includes glass or the like.

In addition, the base substrate may be polyethylene terephthalate (Poly (ethylene terephthalate), PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride (Poly (vinyl) chloride), PVC) and copolymers thereof.

The conductive polymer is polyaniline, polythiophene, polypyrrole, poly (3,4-ethylene deoxythiophene), poly (3-alkyl Poly 3-alkylthiophene, poly iso-thianaphthene, poly p-phenylene, derivatives thereof, and the like.

The dopant includes sulfonic acid derivatives, and the sulfonic acid derivatives include camphor sulfonic acid, dodecylbenzene sulfonic acid, dinonyl naphthalene sulfonic acid, and dibutyl naphthalene sulfonic acid. sulfonic acid), toluene sulfonic acid, and methane sulfonic acid.

A filter for a display device according to an aspect of the present invention is formed by stacking a plurality of functional members for performing a plurality of functions including an electromagnetic shielding function. In this case, any one of the functional members is, i) a base substrate, and ii) an electromagnetic wave having a conductive polymer layer formed by coating on the base substrate and comprising a conductive polymer and a dopant. And a shielding layer.

In the filter for display device, the electromagnetic shielding function is achieved by the electromagnetic shielding layer alone.

When the filter for the display device includes an external light shielding layer, the conductive polymer layer is coated on one surface of the base substrate, and the external light shielding layer is disposed on the other surface of the base substrate.

According to an aspect of the present invention, a display apparatus includes a transparent front substrate and a back substrate coupled to face each other, a panel assembly including a plurality of cells between the front substrate and the back substrate, and a front substrate of the panel assembly. It includes a filter for a display device disposed is formed by stacking a plurality of functional members for performing a plurality of functions including the electromagnetic shielding function.

In this case, the filter for the display device, for the electromagnetic shielding function, the electromagnetic wave having a conductive polymer layer comprising a conductive polymer and a dopant formed by coating on the base substrate and ii) the base substrate for ii) And a shielding optical member.

The display device used in the present invention includes a plasma display panel (PDP) device, an organic light emitting diode (OLED) device, a liquid crystal display (LCD) device, and a FED (Field), which implement RGB with pixels of a grid pattern. It can be applied in various ways. Hereinafter, the present invention will be described using a PDP device and a PDP filter used for convenience of description, but the present invention is not limited thereto and may be applied to the aforementioned various display devices and filters for display devices used therein.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited to the embodiments. Like reference numerals in the drawings denote like elements.

1 is an exploded perspective view showing a PDP apparatus according to an embodiment of the present invention.

First, referring to FIG. 1, a structure of a PDP device 100 according to an embodiment of the present invention includes a case 110, a driving circuit board 120 accommodated in the case 110, and a discharge in which a gas discharge phenomenon occurs. The panel assembly 130 includes a cell, a PDP filter 140 including various functional optical members, and a cover 150 covering an upper portion of the case 110.

The PDP filter 140 is disposed above the front substrate of the panel assembly 130. In this case, the PDP filter 140 may be spaced apart from the front substrate of the panel assembly 130 or may be disposed in contact with each other, and also between the panel assembly 130 and the PDP filter 140. The front substrate may be combined with an adhesive or an adhesive to prevent side effects such as inflow or to reinforce the strength of the PDP filter 140 itself.

The PDP filter 140 includes a conductive layer formed of a material having excellent conductivity on the transparent substrate, and the conductive layer is grounded to the case 110 through the cover 150. That is, before the electromagnetic wave generated from the panel assembly 130 reaches the user, it is grounded to the cover 150 and the case 110 through the conductive layer of the PDP filter 140. Discharge gas is sealed in the discharge cell (not shown), and as the discharge gas, for example, a Ne-Xe-based gas or a He-Xe-based gas may be used. The panel assembly 130 basically has a light emitting principle such as a fluorescent lamp, and the ultraviolet rays emitted from the discharge gas are converted into visible light by exciting the phosphor layer in the panel assembly 130 with the discharge in the light emitting cell. .

2 is a cross-sectional view illustrating a PDP filter according to an embodiment of the present invention.

Referring to FIG. 2, the PDP filter 200 includes functional optical members having various shielding functions, and the functional optical members include an antireflection layer 210, an external light shielding layer 220, a color correction layer 230, and an electromagnetic wave. Shielding layer 240;

The anti-reflection layer 210 is disposed at the outermost surface in contact with the external environment light 310, and the external light shielding layer 220, the color correction layer 230, and the electromagnetic wave shielding layer 240 are disposed on the rear surface of the anti-reflection layer 210. Laminated in order. In this case, the electromagnetic shielding layer 240 is disposed on a surface in contact with the incident light 320 emitted from the PDP panel. In this case, the electromagnetic shielding layer 240 may be disposed to be spaced apart from the PDP panel at a predetermined distance, or alternatively, may be directly attached to one surface of the PDP panel.

The electromagnetic shielding layer 240 includes a base substrate 242 and a conductive polymer layer 244. In the present embodiment, the conductive polymer layer 244 is coated on one surface of the base substrate 242 facing the panel in the electromagnetic shielding layer 240, and an external light shielding layer is formed on the other surface of the base substrate 242. It has a form to be arranged.

In the present invention, the stacking structure of the PDP filter 200 has been described in the above-described order, but the stacking structure may be changed in various forms.

The anti-reflection layer 210 prevents the external environment light 310 incident from the viewer direction to be reflected back to the outside, thereby improving the contrast ratio of the display. Although the arrangement of the anti-reflection layer 210 may be different in some cases, when the PDP filter 200 is mounted on the PDP device, the anti-reflection layer 210 may be formed on the side of the viewer, that is, on the side opposite to the panel assembly (not shown). Is efficient.

The external light shielding layer 220 is a support 222, a matrix 224 formed on one surface of the support 222, and external ambient light 310 formed in the substrate 224 and introduced into the panel assembly from the outside. A plurality of wedge shaped black stripe 226.

The support 222 supports the substrate 224 on which the black stripe 226 is formed. As the support 222, a transparent resin film having ultraviolet ray permeability is preferable. The support 222 may be made of, for example, polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA) poly, or the like. Poly (vinyl chloride), PVC, and copolymers thereof may be used.

The substrate 224 is mainly formed of an ultraviolet curable resin, and provides a groove that may include the black stripe 226.

The black stripe 226 serves to prevent external environment light 310 from flowing into the panel assembly and is formed in parallel on one surface of the substrate 224 facing the incident light 320 of the panel. The black stripe 226 has a wedge shape in cross section and is disposed on an opposite surface of the anti-reflection layer 210 with respect to the support 222.

In the present invention, the black stripe 226 has been described as being disposed on the panel assembly side. However, in some cases, the black stripe 226 may be disposed toward the external ambient light 310.

The black stripe 226 may be formed of a black inorganic material or an organic material or a metal that can absorb light. In addition, as the black stripe 236, an ultraviolet curable resin containing carbon may be used.

In the present invention, the external light shielding layer has been described as described above, but in some cases, the external light shielding layer 220 is formed on the rear surface of the color correction layer 230 or the electromagnetic wave shielding layer 240 without the support 222. The black stripe 226 may have a shape other than the wedge shape.

In addition, although not shown, the PDP filter 200 may further include a diffusion layer. The diffusion layer is a moire phenomenon or a Newton's ring phenomenon, which may be caused by interference between incident light and reflected light when the periodic pattern of the external light shielding layer 220 is reflected on the front substrate of the panel assembly. Serves to prevent. The diffusion layer may be disposed at any position within the PDP filter 200, but is preferably formed on one surface of the PDP filter 200 adjacent to the panel assembly. The diffusion layer may exist as a separate layer, or alternatively, may be included in combination with other optical members.

The PDP filter 200 includes a color correction layer 230 that selectively absorbs light of a specific wavelength band. The color correction layer 230 is located on one surface of the external light shielding layer 220 in the direction of the panel assembly, but is not limited thereto. The color correction layer 230 changes or corrects the color balance by reducing or adjusting the amount of red (R), green (G), and blue (B), increases the color reproduction range of the display, and increases the sharpness. Improve.

The color correction layer 230 includes various pigments, and as the pigments, dyes or pigments may be used. Kinds of pigments include organic pigments having neon light shielding functions such as anthraquinone, cyanine, azo, stryl, phthalocyanine and methine, but the present invention is not limited thereto. Since the type and concentration of the dye are determined by the absorption wavelength, absorption coefficient, and transmission characteristics required in the display, the dye is not limited to a specific value and is not used.

The electromagnetic shielding layer 240 serves to block electromagnetic waves generated from the panel assembly. In order to shield the electromagnetic waves, it is necessary to cover the display surface with a highly conductive object.

The electromagnetic wave shielding layer 240 includes a base substrate 242 having ultraviolet permeability and a conductive polymer layer 244 formed on one surface of the base substrate 242, and the conductive polymer layer 244 includes a conductive polymer and a dopant. (dopant). The electromagnetic shielding layer 240 is a conductive polymer and dopant mixed on one or both surfaces of the base substrate 242, instead of using a pressure-sensitive adhesive or a pressure sensitive adhesive (PSA) used to manufacture a general electromagnetic shielding layer. The solution is directly coated and used.

Although not shown, the PDP filter 200 according to an embodiment of the present invention may further include a near infrared shielding layer. The near-infrared shielding layer serves to shield the strong near-infrared rays generated from the panel assembly causing malfunction of electronic devices such as a wireless telephone or a remote controller.

Hereinafter, the electromagnetic shielding layer 240 will be described in more detail.

Electromagnetic shielding layer 240 according to an embodiment of the present invention is formed by coating on the base substrate 242, the base substrate 242, a conductive polymer layer containing a conductive polymer and a dopant (dopant) ( 244).

The base substrate 242 is a plate-like support made of a transparent material that transmits visible light.

In this embodiment, in order to improve adhesion to the conductive polymer layer 244 to the base substrate 242, glass whose surface is modified by using plasma treatment is used. When the glass substrate is subjected to plasma treatment, the surface of the glass substrate can be changed to hydrophilic or hydrophobic.

In the present exemplary embodiment, glass is used as the base substrate 242. Alternatively, an inorganic compound such as quartz or a transparent organic polymer compound may be used. The transparent organic polymer compound includes polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride vinyl chloride), PVC), copolymers thereof, and the like are generally used, but the present invention is not limited to these.

The base substrate 242 preferably has high transparency and heat resistance, and a laminate of the inorganic compound, the organic polymer compound, and the inorganic compound or the organic polymer compound may also be used as the base substrate 242. As for the transparency of the base substrate 242, it is advantageous that the visible light transmittance is 80% or more, and in terms of heat resistance, it is preferable that the glass transition temperature is 50 ° C or more when it is an organic polymer. In addition, in the case of an organic polymer, it is preferable that it is transparent in visible wavelength range.

The conductive polymer layer 244 is coated on the base substrate 242 on the side facing the PDP panel. In the present embodiment, the conductive polymer layer 244 has been described as described above. Alternatively, the conductive polymer layer 244 may be coated on the opposite surface of the base substrate 242. The conductive polymer layer may be coated on both surfaces thereof.

The conductive polymer layer 244 includes a conductive polymer and a dopant.

The conductive polymer may be polyaniline, polythiophene, polypyrrole, poly (3,4-ethylene deoxythiophene), poly (3- Poly 3-alkylthiophene, Poly iso-thianaphthene, Poly p-phenylene and derivatives thereof may be used.

The dopant is a sulfonic acid derivative, Camphor sulfonic acid, Dodecylbenzene sulfonic acid, Dinonyl naphthalene sulfonic acid, Dibutyl naphthalene sulfonic acid, Toluene sulfonic acid Toluene sulfonic acid and methane sulfonic acid.

The dopant may be used in addition to the sulfonic acid derivatives as described above, hydrochloric acid, phosphoric acid, and derivatives thereof.

As described above, the conductive polymer including the dopant exhibits high electrical conductivity similar to that of metal.

When the ratio of the conductive polymer and the dopant is 1: 0.1 or less or 1: 2 or more, the conductivity of the conductive polymer layer 244 may not exhibit an effective value. Therefore, the ratio of the conductive polymer and the dopant in the conductive polymer layer 244 is preferably 1: 0.1 to 2 by weight. The ratio of the conductive polymer and the dopant may vary depending on the type of the conductive polymer and the dopant.

When the conductive polymer layer is 0.01 μm or less, it is difficult to effectively shield electromagnetic waves. When the conductive polymer layer is 100 μm or more, it is difficult to uniformly coat the base substrate. Therefore, the thickness of the conductive polymer layer is preferably 0.01 to 100 ㎛.

Hereinafter will be described a method of manufacturing an electromagnetic shielding layer according to an embodiment of the present invention.

The method of manufacturing an electromagnetic shielding layer may include surface treating a glass substrate, dissolving a conductive polymer and a dopant in an organic solvent to prepare a solution, filtering the prepared solution, and filtering the filtered solution onto the surface. Coating on the treated glass substrate, and heat treating the coated solution to form a conductive polymer layer.

In order to manufacture the electromagnetic shielding layer, the glass surface is first modified by plasma treatment for about 5 seconds. Surface treatment of the glass substrate in this way, it is possible to improve the adhesion between the treated glass substrate and the coated polymer layer, it is possible to prevent the polymer layer from peeling off after the coating without a separate pressure-sensitive adhesive layer.

Thereafter, the conductive polymer and the dopant are mixed in an organic solvent to prepare a polymer solution. As the organic solvent, a solvent such as meta cresol, chloroform, N-methyl pyrrolidone, or the like may be used.

When the total solid content of the polymer solution is 0.2% or less, it is difficult to obtain a coating on the base substrate, and when it is 10% or more, problems occur in filtering. Therefore, the polymer solution includes 0.1 to 5% by weight of the conductive polymer, 0.1 to 5% by weight of the dopant and 90 to 99.8% by weight of the solvent, preferably 0.5 to 2.5% by weight of the conductive polymer, 0.5 to 2.5% by weight of the dopant and 95 To 99% by weight.

The ratio of the conductive polymer and the dopant is 1: 0.1 to 2 by weight.

When the viscosity of the prepared polymer solution is 0.5 dl / g or less, it is difficult to constantly coat the glass substrate, and when the viscosity is 5 dl / g or more, it becomes a problem when filtering. Therefore, the viscosity of the polymer solution is 0.5 to 5 dl / g, preferably 1.0 to 3.0 dl / g.

In addition, ultrasonic mixing (ultra sonic) treatment in the mixing step as described above can also be used together.

The prepared polymer solution is filtered using a membrane filter or the like, and then coated to a thickness of 0.01 to 100 μm on the surface-modified glass substrate. As the coating method of the polymer solution, a spray method, a spin coating method, a roll coating method, a solution casting method, or the like can be used.

As described above, the glass substrate coated with the polymer is heat treated at 60 to 100 ^° C. for at least 24 hours to form an electromagnetic shielding layer coated with a conductive polymer layer.

Hereinafter, the present invention will be described in more detail with reference to specific examples. However, the technical spirit of the present invention is not limited by the following examples.

Example 1

Polyaniline, camphor sulfonic acid and metacresol were mixed in a 1: 1.5: 97.5 weight ratio to prepare a polymer solution and coated at 50 nm on a surface treated glass substrate. The glass substrate coated with the polymer solution was heat-treated at 60 ^° C. for 24 hours to prepare an electromagnetic shielding layer.

Example 2

Polyaniline, camphor sulfonic acid and metacresol were mixed at a weight ratio of 0.7: 1.0: 98.3 to prepare a polymer solution and coated at 50 nm on a surface treated glass substrate. The glass substrate coated with the polymer solution was heat-treated at 60 ^° C. for 24 hours to prepare an electromagnetic shielding layer.

 (1) transparency measurement

Transparency was measured using the electromagnetic shielding layers prepared in Examples 1 and 2. As a measuring method, transparency was measured by transmitting a wavelength of 1200 to 200 nm using a general UV apparatus. The measurement results are shown in Table 1.

(2) electrical conductivity and surface resistance measurement

Electrical conductivity and surface resistance were measured using the electromagnetic shielding layers prepared in Examples 1 and 2. As a measuring method, a 4-point probe device was used, and the measurement results are shown in Table 1.

 Transmittance (%)  Electrical conductivity (S / cm)  Surface resistance (Ω / □)  Thickness (nm)  Example 1   > 80  1000  25  50  Example 2   > 80  600  28  50

Referring to Table 1, the electromagnetic shielding layers prepared in Examples 1 and 2 exhibited a transparency of 80% or more, and showed high electrical conductivity and low surface resistance.

(3) electromagnetic shielding efficiency measurement

Using the electromagnetic shielding layer prepared in Example 1, the electromagnetic shielding efficiency (ES) for the 0 ~ 14 GHz frequency (frequency, f) region was measured. The measurement results are shown in FIG. 3.

Referring to FIG. 3, the electromagnetic shielding layer according to the first embodiment exhibited an electromagnetic shielding efficiency of 40% or more (electromagnetic shielding efficiency reference value) in the frequency domain.

Therefore, according to the present embodiment, it is possible to provide an electromagnetic wave shielding optical member having an effective electromagnetic wave shielding efficiency through a single layer conductive polymer layer made of a conductive polymer and a dopant coated on a glass substrate.

As described above, according to the optical member for electromagnetic wave shield according to the present invention, high electrical conductivity can be obtained, and effective electromagnetic wave shielding can be achieved. That is, by coating the conductive polymer layer including the conductive polymer and the dopant on the base substrate, it is possible to provide an effective electromagnetic shielding optical member.

In addition, compared to the conventional electromagnetic shielding layer manufacturing method, it is possible to manufacture an electromagnetic shielding optical member through a simple method without a complicated manufacturing process, it is possible to effectively shield electromagnetic waves with a single layer without stacking multiple layers.

In addition, by simplifying the manufacturing process has the advantage of simplifying the coating equipment, and reduce the production cost by not using expensive mesh.

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above embodiments, and those skilled in the art to which the present invention pertains various modifications and variations from such descriptions. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims below, but also by those equivalent to the claims.

Claims (13)

A base substrate; And The optical member for electromagnetic wave shielding is formed on the base substrate and provided with a conductive polymer layer comprising a conductive polymer and a dopant. The method of claim 1, The base substrate is an electromagnetic shielding optical member, characterized in that the surface is modified by a plasma treatment. The method of claim 1, The base substrate is an electromagnetic shielding optical member, characterized in that it comprises a glass. The method of claim 1, The base substrate is polyethylene terephthalate (PET), polycarbonate (PC), polymethyl methacrylate (PMMA), polyvinyl chloride (polyvinyl chloride) , PVC) and a copolymer thereof. The method of claim 1, The conductive polymer is polyaniline, polythiophene, polypyrrole, poly (3,4-ethylene deoxythiophene), poly (3-alkyl At least one polymer selected from the group consisting of poly 3-alkylthiophene, poly iso-thianaphthene, poly p-phenylene and derivatives thereof An electromagnetic member for shielding electromagnetic waves. The method of claim 1, The dopant is an electromagnetic shielding optical member comprising a sulfonic acid derivative. The method of claim 6, The sulfonic acid derivatives include camphor sulfonic acid, dodecylbenzene sulfonic acid, dinonyl naphthalene sulfonic acid, dibutyl naphthalene sulfonic acid, and toluene sulfonic acid. acid) and methane sulfonic acid, and at least one sulfonic acid selected from the group consisting of optical members for electromagnetic shielding. The method of claim 1, In the conductive polymer layer, the ratio of the conductive polymer and the dopant is 1: 0.1 to 2 weight ratio, the optical member for electromagnetic shielding. The method of claim 1, The conductive polymer layer is an electromagnetic shielding optical member, characterized in that 0.01 to 100 ㎛. In the filter for a display device formed by stacking a plurality of functional members for performing a plurality of functions including the electromagnetic shielding function, The functional member of any one of the functional members, i) a base substrate; And ii) a filter for a display device formed on the base substrate and including an electromagnetic shielding layer having a conductive polymer layer comprising a conductive polymer and a dopant. The method of claim 10, The electromagnetic shielding function is a filter for a display device, characterized in that made by the electromagnetic shielding layer alone. The method of claim 10, The display device filter includes an external light shielding layer, The conductive polymer layer is coated on one surface of the base substrate, and the external light shielding layer is disposed on the other surface of the base substrate filter for a display device. A panel assembly including a transparent front substrate and a back substrate coupled to face each other and a plurality of cells between the front substrate and the back substrate; And A display device comprising the filter for display device of claim 10.

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