KR20080065420A - Optical member for display apparatus, and filter for display apparatus having the same - Google Patents

Abstract

An optical member for a display apparatus and a filter for a display apparatus having the same are provided to simplify a thin film deposition process by implementing sufficient external light shield and electromagnetic interference shield with a single optical member. An optical member for a display apparatus includes a base(220) and an external light shielding pattern. The external light shielding pattern is composed of a plurality of first external light shielding units(250) and at least one second external light shielding unit(260). The base is made of transparent resin material. The external light shielding pattern is formed on one surface of the base. The plurality of first external light shielding units have a stripe shape. The second external light shielding unit connects the first external light shielding units. The external light shielding pattern further includes at least one loop pattern(240) formed by adjacent first external light shielding units and the second external light shielding pattern formed between the adjacent first external light shielding units.

Description

Optical member for display apparatus and filter for display apparatus including same {Optical member for display apparatus, and filter for display apparatus having the same}

1 is a cross-sectional view illustrating a PDP filter including an optical member for a display device according to an embodiment of the present invention.

2 is a perspective view illustrating an optical member for a display apparatus according to an embodiment of the present invention.

3 is a cross-sectional view of the optical member of FIG. 2 taken along the line II ′.

4 is a plan view of an optical member according to another exemplary embodiment of the present disclosure.

[Description of Major Symbols in Drawing]

100: filter for display device 110: filter base

112: antireflection layer 114: color correction layer

116: transparent substrate 118: electromagnetic shielding layer

130: support 150: optical member

152: base material 154: external light shielding pattern

180: outside ambient light

200, 400: optical member 220, 420: substrate

240 and 440: loop patterns 250 and 450: first external light shielding part

260 and 460: second external light shielding part 410: electrode pattern

The present invention relates to an optical member for a display device and a filter for a display device including the same, and more particularly, to an optical member for a display device that can improve electromagnetic shielding and external light shielding function, and a filter for a display device including the same. will be.

As the modern society becomes more and more information, photoelectronics related parts and devices are remarkably advanced and spread. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses of personal computers, and the like, and thinning is progressing at the same time as these displays are enlarged. In particular, while the demand for cathode ray tubes (CRTs), which are conventionally used mainly for TV receivers and computer monitors, is gradually decreasing, liquid crystal displays (LCDs) and electronic luminescence (EL), which are capable of flattening, high-definition, and large-sized displays The demand for flat panel displays such as plasma display panels (PDPs) is exploding.

In general, a plasma display panel (PDP) device has been spotlighted as a next-generation display device because it can satisfy both size and thickness at the same time as a cathode ray tube (CRT) representing a conventional display device. The PDP apparatus displays an image using a gas discharge phenomenon, and is excellent in various display capabilities such as display capacity, brightness, contrast, afterimage, viewing angle, and the like. In addition, the PDP device is easier to be enlarged than other display devices, and is considered as a thin light emitting display device having the most suitable characteristics as a high quality digital television in the future.

The PDP device generates a discharge in the gas between the electrodes by a direct current or an alternating current voltage applied to the electrode, and excites the phosphor by the radiation of ultraviolet rays, which emits light.

However, the PDP device has a large amount of emission of Near Infrared Ray (NIR), which causes malfunctions such as electromagnetic interference (EMI) and a remote control, which are harmful to the human body due to the high voltage applied when generating the gas discharge phenomenon. In addition, the surface reflection of the phosphor is not only high, the color purity is less than the CRT due to the orange light emitted from the helium (He) or xenon (Xe) as the encapsulation gas.

As such, electromagnetic waves and near-infrared rays generated from the PDP device may adversely affect the human body and cause malfunctions of the precision equipment. Therefore, in order to use such a PDP device, emission of the electromagnetic wave and near-infrared light emitted from the PDP device is reduced to a predetermined value or less. It is required to do it. To this end, in order to shield electromagnetic waves and near infrared rays, and to reduce reflected light and improve color purity, a PDP filter having a function such as electromagnetic shielding, near infrared shielding, light surface reflection prevention and / or color purity improvement is employed.

Such a PDP filter is manufactured by stacking several functional films such as an electromagnetic shielding layer, a near infrared shielding layer, and a neon light shielding layer by using an adhesive or an adhesive. A double electromagnetic shielding layer is a mesh type using a metal mesh and a conductive film using a conductive film. There is a type.

Among them, a conductive film type is manufactured by stacking a metal layer made of metal and a transparent layer having a high refractive index. In order to increase electromagnetic wave shielding efficiency, it is generally formed by laminating metal layers 3 to 6 times. However, the process of laminating a metal layer for manufacturing an electromagnetic wave shielding layer of the conductive film type is a thin film deposition process, which requires a very long time and the visible light transmittance of the entire film decreases as the process is repeated. In addition, as a disadvantage of PDP, research results have been published that when the external environment is bright due to low contrast ratio, the screen is difficult to see due to the influence of external light, and when the electromagnetic shielding rate of PDP is low, it adversely affects the human body.

Therefore, by reducing the metal layer of the conductive shielding type EMI shielding layer, the thin film deposition process can be efficiently designed, and the PDP using a film that can not only increase the electromagnetic shielding efficiency but also effectively shield external light and also increase the visible light transmittance of the film The development of the filter is required.

In view of the above problems, the present invention provides an optical member capable of simultaneously shielding electromagnetic light and shielding external light by filling a substrate with a conductive material capable of absorbing external light.

The present invention also provides a filter for a display device employing the optical member.

An optical member according to an aspect of the present invention is formed on a substrate made of a transparent resin material, and one surface of the substrate, at least connecting the plurality of first external light shielding portions having a stripe shape and the adjacent first external light shielding portions. It includes an external light shielding pattern consisting of one second external light shielding portion.

The present invention includes a case where the first external light shielding portion is arranged parallel to the long side of the substrate, and has a wedge shape having a bottom surface exposed to the outside of the substrate and an inclined surface extending from the bottom surface.

The second external light shielding portion may be formed along a short side of the substrate.

The second external light shielding pattern may include at least one loop pattern formed by the adjacent first external light shields and the second external light shields formed between the adjacent first external light shields.

The substrate constituting the optical member is characterized in that it comprises at least one resin component selected from the group consisting of polyethylene terephthalate, acrylic, polycarbonate, urethane acrylate, polyester, epoxy acrylate and brominated acrylate.

The present invention is characterized in that the external light shielding pattern includes a conductive material, and the conductive material includes at least one material selected from the group consisting of metal powder, metal oxide powder, and carbon nanotubes. Alternatively, the conductive material may be a conductive polymer, the conductive polymer may be polythiophene, polypyrrole, polyaniline, poly (3,4-ethylenedioxythiophene), poly (3-alkylthiophene), polyisothianaphthene, At least one substance selected from the group consisting of poly (p-phenylenevinylene), poly (p-phenylene) and derivatives thereof.

The total area of the second external light shielding portions exposed to the outside of the substrate is 10 to 70% with respect to one surface of the substrate, and the depth of the second external light shielding portion is 30 to the depth of the first external light shielding portion. To 70%.

The electromagnetic shielding ratio of the optical member is at least 15 μV / m, and the external light reflection amount is 1.0 cd / m ² or less.

The optical member may further include an electrode pattern formed along both short sides of the substrate.

A filter for a display device according to an aspect of the present invention includes a filter base and an optical member. The optical member has an external light shielding pattern formed on one surface of a transparent resin substrate, and the external light shielding pattern includes a plurality of first external light shielding parts, and the first external light shielding parts are connected to a second external light shielding part. It is characterized by being.

The filter base may include a transparent substrate, an electromagnetic shielding layer disposed on one surface of the transparent substrate to block electromagnetic waves generated from the panel assembly, a color correction layer for color correction of an image generated from the panel assembly, and one of the transparent substrates. And an antireflection layer disposed on the surface and preventing reflection of external light.

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

1 is a cross-sectional view showing a filter for a display device according to an embodiment of the present invention.

Referring to FIG. 1, the PDP filter 100 includes a filter base 110 and an optical member 150 including functional layers having various shielding functions on the transparent substrate 116.

Here, the filter base 110 is formed by stacking the transparent substrate 116, the electromagnetic shielding layer 118, the color correction layer 114, or the anti-reflection layer 112 in any order. Here, the transparent substrate 116 is generally manufactured using a transparent plastic material such as glass or acrylic. However, the transparent substrate 116 may be excluded according to the specification of the filter base 110.

In one embodiment of the present invention, examples of the transparent substrate 116 include inorganic compound moldings such as glass and quartz and transparent organic polymer molding.

Acrylic or polycarbonate is generally used as the transparent substrate 116 made of an organic polymer molding, but the present invention is not limited to these embodiments. The transparent substrate 116 preferably has high transparency and heat resistance, and a polymer molded product and a laminate of polymer molded products may be used as the transparent substrate 116. As for the transparency of the transparent substrate 116, it is advantageous that the visible light transmittance is 80% or more, and in terms of heat resistance, the glass transition temperature is preferably 50 ° C or more. The polymer molding may be transparent in the visible wavelength region, and specific examples thereof include polyethylene terephthalate (PET), polysulfone (PS), polyether sulfone (PES), polystyrene, polyethylene naphthalate, polyarylate, and poly Ether ether ketone (PEEK), polycarbonate (PC), polypropylene (PP), polyimide, triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), and the like, but are not limited thereto. Among them, polyethylene terephthalate (PET) is preferred in view of price, heat resistance and transparency.

The anti-reflection layer 112 prevents external light incident from the viewer direction to be reflected back to the outside, thereby improving the contrast ratio of the display. The anti-reflection layer 112 according to the embodiment of the present invention is formed on the other surface of the color correction layer 114, but the present invention is not limited to this stacking order. Preferably, as shown in FIG. 1, the anti-reflection layer 112 is a surface facing the viewer, which is the direction in which the external environmental light 180 is incident when the PDP filter 100 is mounted on the PDP device, that is, the panel assembly side. It is efficient to be formed on the opposite side.

The electromagnetic shielding layer 118 serves to block electromagnetic waves generated from the panel assembly. In order to shield the electromagnetic waves, the surface of the display needs to be covered with a highly conductive object. As the electromagnetic wave shielding layer 118 for shielding electromagnetic waves according to an embodiment of the present invention, a multilayer transparent conductive film including a conductive mesh film or a metal thin film and a high refractive index transparent thin film may be used. As the conductive mesh film, generally, a metal mesh ground or a metal coating on a mesh of synthetic resin or metal fiber can be used. As a material of the metal which comprises a conductive mesh film, if the metal which is excellent in electroconductivity and workability, such as copper, chromium, nickel, silver, molybdenum, aluminum, can be used, for example.

In addition, the multilayer transparent conductive film may be a high refractive transparent thin film represented by indium tin oxide (ITO) to shield the electromagnetic waves. Examples of the multilayer transparent conductive film include a multilayer thin film in which metal thin films such as gold, silver, copper, platinum, and palladium are alternately stacked with high refractive index transparent thin films such as indium oxide, ditin oxide, and zinc oxide.

The metal thin film is a thin film layer made of silver (Ag) or an alloy containing silver. Among them, silver can be suitably used because of its excellent visible light transmittance when conductive, infrared reflecting properties, and multilayer lamination are provided. However, since silver has low chemical and physical stability and deteriorates due to pollutants, water vapor, heat, light, and the like of the surrounding environment, silver has one kind of metal that is stable to the surrounding environment such as gold, platinum, palladium, copper, indium, and tin. The alloy containing the above can also be used preferably.

In addition, the high refractive index transparent thin film layer has transparency to visible light, and has an effect of preventing visible light from being reflected by the metal thin film due to a difference in refractive index with the metal thin film. Specific materials for forming such a high refractive index transparent thin film include oxides such as indium, titanium, zirconium, bismuth, tin, zinc, antimony, tantalum, cerium, neodium, lanthanum, thorium, magnesium, potassium, or mixtures of these oxides. And zinc sulfide.

Although not shown, the filter base 110 according to an embodiment of the present invention may separately include a near infrared shielding layer. The near-infrared shielding layer serves to shield strong near-infrared rays generated from the panel assembly causing malfunction of electronic devices such as wireless telephones and remote controls.

In the exemplary embodiment of the present invention, in the case of using the multilayer transparent conductive film in which the metal thin film and the high refractive index transparent thin film are laminated as the electromagnetic shielding layer 118, the multilayer transparent conductive film shields near infrared rays. Therefore, in this case, two functions of shielding near infrared rays and electromagnetic waves may be performed only by the electromagnetic shielding layer 118 without separately forming the near infrared shielding layer. Of course, also in this case, the near-infrared shielding layer mentioned later can also be formed separately.

In the embodiment of the present invention, when the conductive mesh film is used as the electromagnetic shielding layer 118, a polymer resin containing a near infrared absorbing dye that absorbs wavelengths in the near infrared region may be used to shield the near infrared rays emitted from the panel assembly. have. For example, organic dyes of various components such as cyanine, anthraquinone, naphthoquinone, phthalocyanine, naphthalocyanine, dimonium, and nickel dithiol may be used as the near infrared absorbing dye. Since PDP devices emit strong near infrared rays over a wide wavelength range, it is necessary to use a near infrared shielding layer capable of absorbing near infrared rays over a wide wavelength range.

In the exemplary embodiment of the present invention, when the transparent conductive film is used as the electromagnetic shielding layer 118, electromagnetic shielding ability may be lower than that of the conductive mesh film. However, electromagnetic shielding may be performed by adding a conductive material to the external light shielding pattern 154. In the case of supplementing or reinforcing the performance, a transparent conductive film can realize a sufficient electromagnetic shielding function. In the present invention, even when the transparent conductive film is used as the electromagnetic shielding layer, the electromagnetic shielding efficiency is improved by connecting the stripe type external light shielding pattern in the optical member so that not only the external light shielding function but also the electromagnetic shielding function can be efficiently performed in the optical member 150. You can.

In the following embodiment of the present invention, the electromagnetic wave shielding layer and the antireflection layer are separately described as separate ones, but the present invention is not limited thereto. That is, the filter base 110 according to an embodiment of the present invention may be composed of one or more layers, and each functional layer may have an electromagnetic shielding function, an antireflection function, or a combination thereof. In addition, the filter base 110 may have all of the aforementioned electromagnetic shielding function, antireflection function, or a combination thereof, or may have only one of them.

The optical member 150 is disposed on one surface of the support 130, and the support is provided on one surface of the filter base 110, that is, on the opposite surface of the anti-reflection layer 112 based on the transparent substrate 116. It is arranged. The optical member 150 is disposed on the side of the panel assembly side of the filter base 110, that is, on the side opposite to the viewer side when the PDP filter 100 is mounted to the PDP apparatus, but the present invention is not limited thereto. The optical member 150 may be disposed on the other surface of the base 110.

The optical member 150 includes a substrate 152 made of a transparent resin material and an external light shielding pattern 154 that blocks external light flowing into the panel assembly from the outside. In the present exemplary embodiment, the external light shielding pattern 154 is formed on one surface of the optical member 150, but is not limited thereto and may be formed on both surfaces. In addition, in the present embodiment, the external light shielding pattern 154 is composed of a plurality of black strips (black stripe) are spaced apart from each other at regular intervals, the shape of the external light shielding pattern 154 may vary.

Here, the optical member 150 may be formed directly on the filter base 110, but as shown in FIG. 1, the optical member 150 may be coupled to the filter base 110 after forming the optical member 150 on the support 130. Can be. The support 130 serves to support the optical member 150.

In one embodiment of the present invention, the support 130 is preferably a transparent resin film having ultraviolet transmittance. As the material of the support 130, for example, polyethylene terephthalate (PET), polycarbonate (PC), polyvinyl chloride (PVC), or the like may be used. Of course, the support 130 may be a film having an inherent function of a filter, for example, an electromagnetic wave shielding layer 118, an antireflection layer 112, or a color correction layer 114.

The color correction layer 114 functions to correct a specific color of incident light emitted from the panel assembly, and may be disposed on one surface of the optical member without being included in the filter base, or alternatively, as shown in FIG. It may be included in the base 110.

In one embodiment of the present invention, the transparent resin substrate 152 of the optical member is polyethylene terephthalate (PolyEthylene Terephthalate), acrylic (Acryl), polycarbonate (Polycabonate), urethane acrylate (Urethane Acrylate), poly It comprises at least one resin component selected from the group consisting of ester (Polyester), epoxy acrylate (Epoxy Acrylate) and brominated acrylate (Brominate Acrylate). The present invention is not limited thereto, and may include an ultraviolet curable resin in addition to the resin components listed above.

The external light shielding pattern 154 may be formed by a roll molding method, a heat press method using a thermoplastic resin, or an injection molding method in which a thermoplastic or thermosetting resin is filled and molded into an optical member having a shape opposite to the external light shielding pattern 154. It can be formed by. In addition, when the substrate 152 constituting the optical member 150 has an antireflection function, an electromagnetic shielding function, a color control function, or a combination thereof, the optical member 150 may additionally perform these functions. have.

The optical member 150 absorbs external light to prevent external light from entering the panel assembly and totally reflects incident light emitted from the panel assembly toward the viewer. Thus, a high transmittance to visible light and a high contrast ratio can be obtained. The optical member 150 in the present invention may perform an electromagnetic shielding function in addition to the above role. The form of the optical member 150 includes a film or a sheet.

Hereinafter, the optical member will be described in more detail.

FIG. 2 is a perspective view illustrating an optical member for a display apparatus according to an exemplary embodiment, and FIG. 3 is a cross-sectional view of the optical member of FIG. 2 taken along the line II ′.

2 and 3, the optical member 200 includes an external light shielding pattern having a transparent resin substrate 220 and a plurality of first external light shielding portions 250 formed on one surface of the substrate. . The first external light shielding part 250 is striped in plan view, and two first external light shielding parts 250 adjacent to each other are connected to at least one second external light shielding part 260. In this case, when the first external light shielding parts 250 adjacent to each other are connected to the plurality of second external light shielding parts 260, as illustrated in FIG. 2, a loop pattern 240 is formed. The loop pattern 240 may be formed only on some of the first external light shielding parts 250 adjacent to each other.

The first external light shielding part 250 according to an embodiment of the present invention is arranged parallel to one surface of the substrate, and has a wedge shape having a bottom surface exposed to the outside of the substrate and an inclined surface extending from the bottom surface. to be. The present invention is not limited thereto, and the external light shielding part may have a trapezoidal cross section, and the like. The external light shielding pattern may also have various shapes.

The external light shielding pattern may be embossed or have a two-dimensional or three-dimensional shape in the form of an intaglio, and as shown in FIG. 2, the second external light shielding in a bridge form between the first external light shields 250. By connecting to the unit 260 may maximize the electrical conductivity.

In addition, the present invention includes a case in which the second external light shielding portion 260 is formed along a short side of the substrate 220. That is, when viewed in plan view, the second external light shielding portion 260 is not disposed inside the substrate 220 but may be disposed at an edge along a short side of the substrate. Although the second external light shielding part 260 performs a function of shielding external light, the first external light shielding part 250 is mainly connected to each other to allow electricity to flow along the external light shielding pattern to the optical member 200. It plays the role of act. As a result, the optical member 200 may shield not only external light but also electromagnetic waves.

Accordingly, the second external light shielding part 260 may connect the first external light shielding parts 250 in the form of a ladder as shown in FIG. 2, or at the edge of the substrate 220, the first external light shielding part ( 250 may be connected to each other, but the technical idea of the present invention is not limited thereto, and the first external light shielding portions 250 may be connected to each other by the second external light shielding portion 260 in some form so as to have a property of a conductive film. Includes all.

Hereinafter, a material filled in the external light shielding pattern will be described.

The external light shielding pattern may include a conductive material, and the conductive material may include at least one material selected from the group consisting of metal powder, metal oxide powder, and carbon nanotubes. As such, the external light shielding pattern may be filled with a resin including a metallic conductive material, and preferably, a silver or copper-based material having high electrical conductivity may be used. As the resin, a thermoplastic resin, a thermosetting resin, a UV resin, an aqueous resin, or the like, which is a general polymer resin, may be used.

In addition, the present invention includes a case where the conductive material is a conductive polymer, the conductive polymer is a polythiophene (polythiophene), polypyrrole (polypyrrole), polyaniline (polyaniline), poly (3,4-ethylenedioxythiophene) (poly (3,4-ethylenedioxythiophene)), poly (3-alkylthiophene), poly (3-alkylthiophene), polyisothianaphthene, poly (p-phenylenevinylene) (poly (p- phenylenevinylene)), poly (p-phenylene), and at least one polymer selected from the group consisting of derivatives thereof.

The first external light shielding part 250 and the second external light shielding part 260 constituting the external light shielding pattern are preferably filled with the same material, but the present invention is not necessarily limited thereto. Each of the 250 and the second external light shielding parts 260 may be filled with different materials.

The total area of the second external light shielding portions 260 exposed to the outside of the substrate 220 is 10 to 70% and preferably 10 to 50% with respect to one surface of the substrate. If the total area of the second external light shielding portions 260 is smaller than 10% of one surface of the substrate, the electromagnetic shielding function may not be stably performed. If the total area of the second external light shielding portions 260 is larger than 50%, the luminance of the display may be lowered. .

Referring to FIG. 3, the cross section of the first outer light shielding portion 250 is wedge-shaped, and the cross section of the second outer light shielding portion 260 is a bridge form connecting two adjacent first outer light shielding portions 250. . The depth of the second external light shield 260 is 30 to 70% of the depth of the first external light shield. If the depth of the second external light shielding portion 260 is less than 30% of the depth of the first external light shielding portion, the electromagnetic shielding efficiency is lowered. If the depth of the second external light shielding portion 260 is greater than 70%, the brightness of the display is lowered.

4 is a plan view of an optical member according to another exemplary embodiment of the present disclosure.

Referring to FIG. 4, the optical member 400 further includes electrode patterns 410 formed along both short sides of the substrate 420. The electrode pattern 410 and the second external light shielding part 460 may be formed in the single optical member 400 as shown in FIG. 4, but the present invention is not limited thereto. By connecting the first external light shielding portions 450 by the electrode pattern 410, the electromagnetic wave shielding efficiency of the optical member 400 may be further increased. In addition, the electrode pattern 410 serves as an assistant capable of effectively shielding or absorbing electromagnetic waves.

The first external light shielding portion 450 is connected by at least two second external light shielding portions 460 to form a loop pattern 440, and the loop pattern 440 is formed of all the first external light shielding portions adjacent to each other ( 450), but may be formed only in part. Alternatively, the second external light shielding portions 460 may be disposed and connected to each other between the first external light shielding portions 450 adjacent to each other.

The optical member of the present invention has an electromagnetic shielding rate of at least 15 µV / m and an external light reflection amount of 1.0 cd / m ² or less.

Hereinafter, the filter for a display device according to the present invention will be described in more detail with reference to the following Preparation Examples, but the following Preparation Examples are illustrative to more specifically describe the present invention, and the contents of the present invention are limited to the following Preparation Examples. no.

[Production Example 1]

One surface of the transparent substrate was laminated in the order of a niobium oxide layer, an aluminum-doped zinc oxide (AZO) layer, a silver thin film layer, and an aluminum-doped zinc oxide layer by a direct current sputtering method, and repeated three times in succession in the stacking order. To form a transparent conductive laminate. After stacking the niobium oxide layer on the transparent conductive laminate again, a photofunctional film containing a conductive polymer was formed on one surface, and a neon light shielding layer and a near infrared shielding layer were formed on the other surface to prepare a PDP filter.

In forming the aluminum oxide doped zinc oxide film, a target in which a small amount of aluminum oxide (Al ₂ O ₃ ) was mixed in zinc oxide (ZnO) was used, and argon (Ar) gas was used as the sputter gas. Silver was used as a target for film formation of a silver thin film, and argon gas was used for sputter gas.

[Production Example 2]

One surface of the transparent substrate was laminated in the order of a niobium oxide layer, an aluminum-doped zinc oxide (AZO) layer, a silver thin film layer, and an aluminum-doped zinc oxide layer by a direct current sputtering method, and repeated two times in succession in the stacking order. To form a transparent conductive laminate. After the process was the same as in Preparation Example 1 to prepare a PDP filter.

Comparative Example 1

One surface of the transparent substrate was laminated in the order of a niobium oxide layer, an aluminum-doped zinc oxide (AZO) layer, a silver thin film layer, and an aluminum-doped zinc oxide layer by a direct current sputtering method, and repeated two times in succession in the stacking order. To form a transparent conductive laminate. After the niobium oxide layer was further laminated on the transparent conductive laminate, a neon light shielding layer and a near infrared shielding layer were formed on the other surface to prepare a PDP filter. A PDP filter was manufactured in the same manner as in Preparation Example 2, except that the optical functional film including the conductive material was not formed.

Comparative Example 2

One surface of the transparent substrate was laminated in the order of a niobium oxide layer, an aluminum-doped zinc oxide (AZO) layer, a silver thin film layer, and an aluminum-doped zinc oxide layer by a direct current sputtering method, and repeated three times in succession in the stacking order. To form a transparent conductive laminate. After the niobium oxide layer was further laminated on the transparent conductive laminate, a neon light shielding layer was formed on the other surface to prepare a PDP filter. A PDP filter was manufactured in the same manner as in Preparation Example 1, except that the optical functional film including the conductive material was not formed and the near-infrared shielding layer was not formed.

As described above, the electromagnetic shielding ratio and the external light reflection amount of the PDP filters prepared in Preparation Examples 1 and 2 and Comparative Examples 1 and 2 were measured. The visible light transmittances of Preparation Examples 1 and 2 and Comparative Examples 1 and 2 were adjusted so that the average luminous transmittance was 50% in the wavelength range between 380 nm and 780 nm of the D65 standard light source.

The electromagnetic shielding rate was measured in accordance with Class B regulations in a shielded room that meets the ANSI C63.4 1992 standard for electromagnetic wave measuring equipment with the manufactured PDP filter mounted on the panel assembly. The results are shown in Table 1 below.

External light reflectance artificially forms external environmental light and adjusts the front roughness of the PDP screen to 150 Lux while the measurement PDP filter is mounted on the panel assembly, and displays the PDP screen as an all-black screen to reflect the external light by using a luminance meter. The luminance was measured in the wavelength range of 780 nm. The results are shown in Table 1 below.

Preparation Example 1 Preparation Example 2 Comparative Example 1 Comparative Example 2 Electromagnetic shielding rate (μV / m) 18 15 12 15 External light reflectance (cd / m ² ) 0.9 0.9 3.0 2.2

As described in Table 1, the electromagnetic shielding ratios of Preparation Examples 1 and 2 have an excellent electromagnetic shielding ratio compared to Comparative Example 1. In addition, in Examples 1 and 2 according to the embodiment of the present invention also in the external light reflectance shows a small value compared to Comparative Examples 1 and 2, the external light shielding efficiency is large.

As described above, according to the present invention, a conductive material may be included in the external light shielding pattern of the optical member to increase the electromagnetic shielding efficiency of the filter for the display device as well as the external light shielding. In addition, a single optical member can exhibit sufficient external light shielding and electromagnetic wave shielding effects, thereby simplifying the thin film deposition process, thereby reducing the manufacturing cost of the display device. In particular, the number of metal layers or metal oxide layers stacked in the optical member can be reduced, so that the visible light transmittance of the film can be increased, and the contrast ratio and brightness of the display device can be increased.

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 determined not only by the claims below but also by the equivalents of the claims.

Claims (16)

Base material of transparent resin material; And Is formed on one side of the substrate, And an external light shielding pattern including a plurality of first external light shielding portions having a stripe shape and at least one second external light shielding portion connecting the adjacent first external light shielding portions. The method of claim 1, The first external light shielding portion is arranged parallel to the long side of the substrate, the optical member, characterized in that the wedge shape having a bottom surface exposed to the outside of the substrate and an inclined surface extending from the bottom surface. The method of claim 1, The said 2nd external light shielding part is formed along the short side of the said base material, The optical member characterized by the above-mentioned. The method of claim 1, The external light shielding pattern may include at least one loop pattern formed by the adjacent first external light shielding parts and the second external light shielding parts formed between the adjacent first external light shielding parts. The method of claim 1, The substrate comprises at least one resin component selected from the group consisting of polyethylene terephthalate, acrylic, polycarbonate, urethane acrylate, polyester, epoxy acrylate and brominated acrylate. The method of claim 1, The external light shielding pattern is an optical member, characterized in that it comprises a conductive material. The method of claim 6, The conductive material includes at least one material selected from the group consisting of metal powders, metal oxide powders and carbon nanotubes. The method of claim 1, The conductive material is an optical member, characterized in that the conductive polymer. The method of claim 8, The conductive polymer may be polythiophene, polypyrrole, polyaniline, poly (3,4-ethylenedioxythiophene), poly (3-alkylthiophene), polyisothianaphthene, poly (p-phenylenevinylene), poly (p-phenylene) and at least one substance selected from the group consisting of derivatives thereof. The method of claim 1, The total area of the second external light shielding portion exposed to the outside of the substrate is 10 to 70% with respect to one surface of the substrate. The method of claim 1, The depth of the second external light shielding portion is 30 to 70% of the depth of the first external light shielding portion, characterized in that the optical member. The method of claim 1, The electromagnetic wave shielding rate of the said optical member is at least 15 microvolts / m. The method of claim 1, The optical member has an external light reflection amount of 1.0 cd / m ² or less. The method of claim 1, The optical member further comprises an electrode pattern formed along both short sides of the substrate. Filter base; And Is formed in one region of the filter base, i) a substrate made of a transparent resin material; And ii) a filter for a display device formed on one surface of the substrate and having a plurality of first external light shielding parts, The first external light shielding portion is connected to the second external light shielding filter for a display device. The method of claim 15, The filter base, Transparent substrate; An electromagnetic shielding layer disposed on one surface of the transparent substrate and blocking electromagnetic waves generated from the panel assembly; A color correction layer for color correction of an image generated from the panel assembly; And And a reflection prevention layer disposed on one surface of the transparent substrate and preventing reflection of external light.

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