KR101091808B1 - Display filter and display device having the same - Google Patents

Abstract

The present invention is a display filter provided in the front of the display module, the base substrate, and the electromagnetic wave shielding layer is laminated on the base substrate to filter the electromagnetic waves, the electromagnetic shielding layer is a high repetitive transparent thin film and a metal thin film multiple repeated stacking And, it provides a display filter characterized in that the resin coating layer is coated with the outermost layer. Preferably, the resin coating layer is directly coated on the outer surface of the outermost metal thin film of the plurality of metal thin films. Preferably, the resin coating layer has a high refractive index. Preferably, the resin coating layer comprises a color correction pigment. A protective thin film may be interposed between the high refractive transparent thin film and the metal thin film, the high refractive transparent thin film may include niobium oxide, the metal thin film may include silver or a silver alloy, and the protective thin film may include AZO. have. In another aspect, the present invention provides a display device comprising the display filter.

Description

DISPLAY FILTER AND DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a display filter and a display device having the same, and more particularly, to a display filter having a resin coating layer as the outermost layer of the electromagnetic shielding layer and a display device having the same.

As the modern society becomes highly informational, display devices are becoming remarkably advanced and rapidly spreading. Display devices such as televisions, PC monitors, portable display devices, and the like have tended to have larger screen sizes and thinner screens.

Accordingly, Cathode Ray Tube (CRT) devices, which are representative of display devices, include Liquid Crystal Display (LCD), Plasma Display Panel (PDP) devices, and Field Emission Display devices. : FED) and flat panel displays (FPDs) such as organic light emitting displays (OLEDs).

PDP devices are in the spotlight due to their excellent display ability such as brightness, contrast, afterimage, viewing angle, and the like. The PDP apparatus applies a direct current or alternating voltage to the electrodes, whereby discharge occurs in the gas between the electrodes. The image is displayed by excitation of the phosphor by the ultraviolet rays accompanying this and emitting visible light.

However, the PDP device has a problem in that a large amount of electromagnetic waves and near-infrared radiation are emitted. Electromagnetic waves and near-infrared rays have a harmful effect on the human body and may cause malfunctions of precision devices such as cordless phones and remote controls. In addition, due to the orange light (neon light) emitted from the discharge gas, there is a problem that the color purity is poor compared to the CRT apparatus.

Therefore, the PDP device employs a display filter in front of the display module to solve this problem.

1 and 2 are cross-sectional views schematically showing a conventional display filter.

As shown, the display filter of FIGS. 1 and 2 includes a base substrate 10, an electromagnetic shielding layer 20, and a color correction film 30.

The electromagnetic shielding layer 20 of FIG. 1 has a structure in which a high refractive index thin film 21 and a metal thin film 23 are repeatedly stacked on one surface of a base substrate 10, and a high refractive transparency thin film 21 is stacked on the outermost layer. Has Meanwhile, in the electromagnetic shielding layer 20 of FIG. 2, the high refractive index thin film 21 and the metal thin film 23 are repeatedly stacked on one surface of the base substrate 10, and the high refractive transparency thin film 21 is laminated on the outermost layer. 1, but has a structure in which a protective thin film 25 is interposed between the high refractive transparency thin film and the metal thin film.

The color correction film 30 has a structure in which the color correction layer 31 is formed on one surface of the PET film 33. The color correction film 30 is adhered to the electromagnetic shielding layer 20 via the adhesive layer 40.

The conventional display filter has a problem in that the manufacturing process of the display filter is complicated due to the structure in which the color correction film is separately manufactured and adhered, resulting in low productivity and increased manufacturing cost.

Typically, the color correction film is supplied to the filter manufacturing industry in a form in which the PET film 33, the color correction layer 31, the adhesive layer 40, and the release film (not shown) are integrated. The filter manufacturer removes the release film and then sticks the color correction film to the filter. Due to this, there is a problem that the consumption of subsidiary materials such as release film, etc. are consumed, causing the cost increase.

In addition, after the adhesion of the color correction film, it is essentially subjected to the autoclave (Autoclave) step, there was a problem that the process time is greatly increased due to the autoclave step.

SUMMARY OF THE INVENTION The present invention has been made in view of the above background, and an object of the present invention is to provide a display filter that can significantly shorten the production process to improve productivity and significantly reduce manufacturing costs.

In order to achieve the above object, the present invention is a display filter provided in front of the display module, the base substrate, and the electromagnetic wave shielding layer laminated on the base substrate to filter the electromagnetic waves, the electromagnetic shielding layer is highly refractive transparent A thin film and a metal thin film are repeatedly stacked, and a resin filter layer is coated on the outermost layer.

Preferably, the resin coating layer is directly coated on the outer surface of the outermost metal thin film of the plurality of metal thin films.

Preferably, the resin coating layer has a high refractive index.

Preferably, the resin coating layer comprises a color correction pigment.

A protective thin film may be interposed between the high refractive transparent thin film and the metal thin film, the high refractive transparent thin film may include niobium oxide, the metal thin film may include silver or a silver alloy, and the protective thin film may include AZO. have.

In another aspect, the present invention provides a display device comprising the display filter.

The present invention can be used as the outermost layer of the electromagnetic shielding layer by directly coating the resin coating layer instead of separately manufacturing and adhering the color correction film to perform a color correction function, greatly shortening the production process to improve productivity There is an effect that can significantly reduce the manufacturing cost.

In particular, by eliminating the autoclave step, the process time can be greatly shortened.

In addition, cost reduction can be achieved by preventing waste of subsidiary materials such as release films and the like.

In addition, by incorporating a conductive material in the resin coating layer, it effectively compensates the low level of electromagnetic shielding performance, which can be pointed out as a disadvantage of the conductive film type electromagnetic shielding layer, and performs a near infrared shielding function, which is an advantage of the conductive film type electromagnetic shielding layer. can do.

In addition, the resin coating layer containing the dye serves as a protective layer to protect the electromagnetic shielding layer of the conductive film type, which is vulnerable to moisture and the like, while performing the color correction function, each component layer has an organic synergistic effect There is this.

In addition, by reducing the number of constituent layers of the display filter disposed in front of the display module, there is an advantage that can provide excellent transmittance and image quality by minimizing optical interference.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the present invention;

3 is an exploded perspective view schematically illustrating a display device according to a first embodiment of the present invention.

The display device 200 according to the first embodiment of the present invention includes a case 210, a cover 250 covering an upper portion of the case 210, a driving circuit board 220 accommodated in the case 210, and a gas. The display module 230 and the display filter 300 including a discharge cell in which the discharge phenomenon occurs.

4 is a cross-sectional view schematically illustrating a display filter according to a second embodiment of the present invention.

The display filter according to the second embodiment of the present invention includes a base substrate 10 and an electromagnetic shielding layer 20 formed on the surface of the base substrate 10.

Examples of the base substrate 10 include inorganic compound moldings such as tempered or semi-reinforced glass and quartz, transparent organic polymer molded articles, and laminates thereof.

Glass has a specific gravity of 2.6, which makes it difficult to reduce the weight and makes the filter thicker when it is installed in the display device. However, the glass has a disadvantage in that the overall weight of the set increases when it is mounted on the display device. Do it.

Organic polymer moldings have the advantage of being light and brittle.

The base substrate 10 preferably has high transparency and heat resistance. As for the transparency of the base substrate 10, it is advantageous that the visible light transmittance is 80% or more, and in terms of heat resistance, the glass transition temperature is preferably 60 ° C or more.

Polymer moldings are sufficient if they are transparent in the visible wavelength range. Specific examples thereof include acrylic, polyethylene terephthalate (PET), polysulfone (PS), polyether sulfone (PES), polystyrene, polyethylene naphthalate, polyarylate, polyether 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.

As the electromagnetic shielding layer 20, an electromagnetic shielding layer of a conductive film type capable of simultaneously shielding electromagnetic waves and near infrared rays is used. In the filter according to the present embodiment, since the electromagnetic wave shielding layer of the conductive film type is directly formed on the base substrate 10, a support such as PET is unnecessary, and an adhesive layer is unnecessary, thereby minimizing the manufacturing process to improve productivity and manufacturing cost. Can be minimized.

Near-infrared rays are generated from the display module and cause malfunction of electronic devices such as wireless telephones and remote controllers. The electromagnetic shielding layer of the conductive film type serves to shield such near infrared rays and to filter the electromagnetic waves generated from the display module before reaching the viewer to emit the electromagnetic waves to the ground such as a case.

The electromagnetic wave shielding layer 20 of the conductive film type is typically formed by multiple repetitive stacking of the high refractive index thin film 21 and the metal thin film 23 using a deposition process such as sputtering or the like. For example, a conductive film obtained by stacking an Ag metal thin film and an ITO high refractive transparency thin film in multiple layers may be used. The composition of each of the high refractive index thin film and the metal thin film may be a layer having the same composition or a layer having a different composition.

The laminated structure of the electromagnetic shielding layer of the present invention and the material of each layer can be variously modified. For example, Korean Patent Publication Nos. 1997-0073950, 2003-0093734, 2004-0003098, 2004-0003241, 2004-0021177, 2005-00022741, 2006-0034053, 2006- 0126162, 2007-0067772, and 2009-0064321 illustrate various laminated structures of conventional conductive film type electromagnetic shielding layers and materials of each layer that can be used.

In the present specification, only three embodiments are illustrated through FIGS. 4 to 6 for convenience, but the stack structure of all conventional electromagnetic shielding layers including the electromagnetic shielding layer described in the above-described patent and the constituent material of each layer are provided in the present invention. Can be combined with

The resin coating layer 27 forms the outermost layer of the electromagnetic shielding layer 20. Preferably, the resin coating layer has a high refractive index. The resin coating layer is directly coated on the outer surface of the outermost metal thin film among the plurality of metal thin films 23.

In contrast to the conventional display filter of Figure 1, the outermost high refractive transparency thin film has a structure in which the resin coating layer is replaced.

The electromagnetic shielding layer of the conductive film type is vulnerable to moisture or oxidation, and the resin coating layer 27 functions to protect the electromagnetic shielding layer of the conductive film type, thereby improving durability by preventing oxidation corrosion of the electromagnetic shielding layer. have.

The resin used for the resin coating layer 27 is preferably a thermosetting resin that is cured by heat. As a result of the test, it could be confirmed that the heat / moisture reliability results of comparable levels can be compared with those of the conventional filter, and through this, it was confirmed that the thermosetting resin was effectively used to protect the conductive film.

However, the present invention is not necessarily limited thereto, and various other resins such as thermoplastic resins can be used.

While it takes 30 minutes to 1 hour to adhere the conventional color correction film and perform the autoclave step, 5 to 10 minutes is sufficient to form the resin coating layer of the present invention, so that the process time is greatly reduced. Have

The resin coating layer 27 may serve to replace the conventional color correction film, including color correction pigments. In this case, a hybrid display filter having a new structure in which the electromagnetic shielding layer and the color correction film are fused together is provided.

The color correction pigments include at least one of a coloring pigment and a neon cut pigment.

The coloring pigment serves to change or adjust the color balance by reducing or adjusting the amounts of red (R), green (G) and blue (G).

In general, red visible light generated from plasma in the display module tends to appear orange. Therefore, the resin coating layer 27 of the present invention may include a neon cut pigment, and may perform a function of blocking orange neon light having a wavelength range of 580 to 600 nm below a predetermined transmittance.

The resin coating layer 27 uses various pigments to increase the color reproduction range of the display and to improve the sharpness of the screen. As such a dye, dyes or pigments may be used.

Kinds of pigments include organic pigments having a neon light shielding function 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.

In addition to the above-mentioned coloring pigment and / or neon cut pigment, the resin coating layer 27 may also include a near-infrared shielding pigment.

The resin coating layer may include an antistatic agent. As the antistatic agent, for example, particles of ATO, AZO, ITO, or the like can be added to impart an antistatic treatment function of 1 × 10 ⁻¹³ Ω / sq or less.

Preferably, the resin coating layer 27 may include a conductive material. With the progress of display devices, the market for full HD TVs is expanding recently. Accordingly, a higher level of electromagnetic shielding performance is required.

Therefore, in the present invention, the conductive coating is included in the resin coating layer 27 by assisting the electromagnetic shielding performance of the electromagnetic shielding layer of the conductive film type, thereby lowering the sheet resistance of the entire filter to increase the electromagnetic shielding performance. Through this, a conductive film type electromagnetic shielding layer can be applied to a full HD TV.

In addition, it is possible to reduce the use of Ag in the electromagnetic shielding layer, it is possible to have the advantages of productivity and cost reduction.

As the conductive material, carbon nanotubes, metal powders, metal oxide powders, or the like may be used.

Here, cobalt, aluminum, zinc, zirconium, platinum, gold, palladium, titanium, iron, tin, indium, nickel, molybdenum, tungsten, silver, copper, and the like may be used as the metal powder. Copper oxide, zinc oxide, indium oxide, tin oxide, indium tin oxide, aluminum zinc oxide, indium zinc oxide, and the like may be used as the metal oxide powder.

In addition, as the conductive material, polythiophene, polypyrrole, polyaniline, li (3,4-ethylenedioxythiophene), poly (3-alkylthiophene), polyisothianaphthene, poly (p-phenylenevinyl) Lene), poly (p-phenylene), and derivatives thereof.

The present invention, as described above, by forming the hybrid electromagnetic wave shielding layer 20 on the base substrate 10 by a direct coating method, by reducing the cost of the adhesive, the release of the discarded subsidiary materials such as release film, etc. Can be achieved. In addition, it is possible to minimize the optical interference through the reduction of the number of layers of the filter, it is possible to provide excellent image quality.

5 is a cross-sectional view of a display filter according to a third embodiment of the present invention.

The electromagnetic shielding layer 20 of FIG. 5 also has a structure in which the high refractive index thin film 21 and the metal thin film 23 are repeatedly stacked in multiple layers, and the resin coating layer 27 is coated on the outermost layer. The resin coating layer 27 is coated on the outer surface of the outermost metal thin film among the plurality of metal thin films 23. However, in the electromagnetic shielding layer of Fig. 5, protective thin films 25a and 25b are interposed between the high refractive index thin film and the metal thin film.

Typically, the high refractive transparency thin film comprises Nb ₂ O ₅ . The high refractive transparency thin film may be composed of only niobium oxide (Nb ₂ O ₅ ), or may contain a small amount of other elemental components other than niobium oxide. As another element component, Ti, Cr, Zr, etc. can be used, for example.

The composition of each of the high refractive transparency thin films may be a layer having the same composition or a layer having a different composition.

The thickness of the high refractive transparency thin film is thinner than the other high refractive transparency thin film (particularly 1/2) in view of reducing the visible light reflectance and increasing the wavelength range in which the low reflectance can be obtained. Degree of thickness).

The high refractive index thin film has a high refractive index whose refractive index is larger than that of air (about 1.5), and may be preferably 2 or more.

The first protective thin film 25a is formed on the high refractive index thin film 21. The first protective thin film 25a is typically formed of an oxide (hereinafter referred to as AZO) containing a small amount of Al or Al ₂ O ₃ in ZnO. For example, the ratio of ZnO: Al ₂ O ₃ may be 90 to 99.9: 10 to 0.1, but is not limited thereto.

When the first protective thin film made of AZO is formed by sputtering, the first protective thin film is formed only by supplying an inert gas without supplying an oxidizing gas by using a target in which a small amount of aluminum oxide is mixed into zinc oxide. In the case of AZO, even if the oxidizing gas is not supplied, the problem of deterioration of the transparency of the first protective thin film does not occur. Therefore, supply of an oxidizing gas such as O ₂ is unnecessary. Therefore, in the formation of the metal thin film 23, the problem of oxidation of the metal thin film by the oxidizing gas does not occur. The first protective thin film serves to protect the metal thin film formed on the first protective thin film to improve durability. In addition, the first protective thin film improves the electromagnetic conductivity exhibited by the metal thin film to improve the electromagnetic shielding performance.

The first protective thin film 25a suppresses the formation of surface plasmons occurring at the interface between the Nb ₂ O ₅ high refractive transparency thin film 21 and the metal thin film 23 to prevent visible light loss caused by light absorption by the surface plasmons. Decrease. At the same time it serves to reduce the visible light reflectance and increase the wavelength band at which low reflectivity can be obtained.

However, in some cases, the first protective thin film 25a may be excluded from the electromagnetic shielding layer.

Subsequently, a metal thin film 23 is formed on the first protective thin film. The metal thin film is made of silver or an alloy composed mainly of silver (Ag is 90% or more by weight). Silver (Ag) has excellent ductility and conductivity, and is excellent in characteristics of maintaining conductivity even when forming a thin film. In addition, there is an advantage that it is easy to obtain a transparent thin film because of low cost and less visible light absorption than other metals.

Despite these advantages, silver was vulnerable to chemicals and therefore there was a limitation in using silver as a metal thin film. However, even when silver is used as the metal thin film by forming the first protective thin film 25a on one surface of the metal thin film 23, durability of the electromagnetic shielding layer does not decrease.

The composition of each metal thin film may be a layer having the same composition, or may be a layer having a different composition.

The second protective thin film 25b serves as a kind of blocker to prevent the electrical conductivity of the metal thin film 23 from disappearing due to the oxygen plasma in the process of forming the high refractive index thin film 21, which is a subsequent process. . That is, when the metal thin film is formed and then used in a DC sputtering method to form a high refractive transparency thin film, the metal thin film previously formed by the oxygen plasma may be damaged.

As the second protective thin film, AZO is typically used.

The composition of the plurality of second protective thin films may be a layer having the same composition, or may be a layer having a different composition.

The second protective thin film suppresses the formation of the surface plasmon generated at the interface between the metal thin film and the high refractive transparency thin film to reduce the visible light loss in the electromagnetic shielding layer caused by the light absorption by the surface plasmon. At the same time, it serves to reduce the visible light reflectance and increase the wavelength band in which low reflectivity can be obtained.

In some cases, the second protective thin film 25b may be excluded from the electromagnetic shielding layer.

As in FIG. 4, the resin coating layer preferably has a high refractive index. The resin coating layer contains a color correction pigment containing at least one of a pigment for coloring and a neon cut pigment. In addition, the resin coating layer may include an antistatic agent and a conductive material. In addition, the resin coating layer may include a thermosetting resin.

6 is a cross-sectional view of a display filter according to a fourth embodiment of the present invention.

As shown, the filter of FIG. 6 has a structure in which the antireflection film 50 is adhered to the front surface of the filter of FIG. 5.

The antireflection film 50 suppresses reflection of external light to improve visibility.

The antireflection film 50 of FIG. 6 has a structure in which an antireflection layer 51 is formed on the PET film 53.

Thin films such as i) fluorine-based transparent polymer resins, ii) magnesium fluoride, iii) silicon-based resins, iv) silicon oxides, and the like, having a refractive index of 1.5 or less, preferably 1.4 or less, in the visible region, for example, have a quarter wavelength. By forming a single layer by the optical film thickness of the antireflection layer 51 can be formed.

In addition, it is reflected that two or more layers of thin films of inorganic compounds such as metal oxides, fluorides, silicides, borides, carbides, nitrides and sulfides having different refractive indices or organic compounds such as silicone resins, acrylic resins and fluorine resins are laminated. It can be used as the prevention layer 51. For example, the antireflection layer 51 may have a structure in which a low refractive index oxide film such as SiO ₂ and a high refractive index oxide film such as TiO ₂ or Nb ₂ O ₅ are alternately stacked.

Up to now, an embodiment in which the filter of the present invention is used in a PDP apparatus has been described, but the filter of the present invention is not limited to the PDP filter. It can be applied to various other display devices within the scope of the claims described below.

In addition, although only an embodiment having an antireflection film in addition to the base substrate and the electromagnetic shielding layer, various functional films or layers may be added as a constituent layer of the display filter of the present invention. For example, the display filter of the present invention may include an external light shielding layer, an antiglare layer, a near infrared shielding layer, or the like.

1 is a cross-sectional view schematically showing a conventional display filter.

2 is a cross-sectional view schematically showing another conventional display filter.

3 is an exploded perspective view schematically illustrating a display filter according to a first embodiment of the present invention.

4 is a cross-sectional view schematically illustrating a display filter according to a second embodiment of the present invention.

5 is a cross-sectional view schematically illustrating a display filter according to a third embodiment of the present invention.

6 is a cross-sectional view schematically illustrating a display filter according to a fourth embodiment of the present invention.

Claims (12)

A display filter provided in front of the display module, Base board, An electromagnetic shielding layer laminated on the base substrate and filtering electromagnetic waves; The electromagnetic shielding layer is a display filter, characterized in that the high refractive index thin film and the metal thin film is repeatedly laminated in multiple, the outermost layer is coated with a resin coating layer containing a thermosetting resin. The method of claim 1, The resin coating layer is a display filter, characterized in that the direct coating on the outer surface of the outermost metal thin film of the plurality of metal thin films. The method of claim 1, The resin coating layer is a display filter, characterized in that having a refractive index larger than the refractive index of the air. The method of claim 1, The resin coating layer is a display filter, characterized in that it comprises a color correction pigment. 5. The method of claim 4, The color correction pigment is a display filter, characterized in that it comprises at least one of a coloring pigment and a neon cut pigment. The method of claim 1, The resin coating layer is a display filter comprising an antistatic agent. The method of claim 1, The resin coating layer is a display filter comprising a conductive material. The method of claim 7, wherein The conductive material includes at least one of a metal nanotube, a metal powder and a metal oxide powder. delete The method of claim 1, And a protective thin film interposed between the high refractive index thin film and the metal thin film. The method of claim 10, The high refractive transparency thin film comprises niobium oxide, the metal thin film comprises a silver or silver alloy, and the protective thin film comprises a AZO. A display device comprising the display filter of claim 1.

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