KR101108610B1 - Filter for display device - Google Patents

Abstract

The present invention provides a base substrate, an electromagnetic shielding coating layer which is directly coated on the surface of the base substrate to shield electromagnetic waves, and a color correction coating layer which is directly coated on any one surface of the base substrate and the electromagnetic shielding coating layer by including a color correction pigment in the resin. It is configured, the electromagnetic wave shielding coating layer and the color correction coating layer is formed on the surface of the base substrate is coated directly without a separate transparent support, thereby providing a filter for a display device that can shorten the manufacturing process to improve productivity and reduce manufacturing costs.

Description

Filter for display device {FILTER FOR DISPLAY DEVICE}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a display device, and more particularly, to a filter for a display device that can shorten a manufacturing process and reduce a manufacturing cost by directly forming a functional layer having respective functions on a base substrate.

As the modern society becomes highly informational, video display-related parts and devices are remarkably advanced and rapidly spreading. Among them, display apparatuses for displaying images are widely used for television apparatuses, monitor apparatuses for personal computers, and the like, and thinning is progressing at the same time as these displays are enlarged.

In general, a plasma display panel (PDP) device is in the spotlight as a next-generation display device because it can satisfy both a larger size and a thinner thickness than a CRT representing a conventional display device. Such a 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 a thin light emitting display device that is considered to have the most suitable characteristics as a high quality digital television in the future, and thus has been spotlighted as a display device that can replace the CRT.

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 displays an image by using a gas discharge phenomenon generated when a high voltage is applied to the gas. The PDP device causes malfunctions such as electromagnetic interference (EMI) and a remote control that are harmful to a human body due to high voltage being applied. Near Infrared Ray (NIR) and orange light have disadvantages of generating neon light that adversely affects color purity.

Therefore, the PDP device shields electromagnetic waves and near-infrared rays while simultaneously reducing reflected light.

In order to reduce the size and improve the 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.

1 is a cross-sectional view showing a filter for a display device according to the prior art.

The display apparatus filter 100 according to the related art has a structure in which a base substrate 110, an electromagnetic wave shielding film 120, a color correction film 130, a near infrared shielding film 140, and an antireflection film 150 are stacked. Have

That is, the electromagnetic shielding film 120 is laminated on one surface of the base substrate 110, and the color correction film 130, the near infrared shielding film 140, and the antireflection film 150 are laminated on the other surface by an adhesive layer. do.

Looking at the structure of each film in detail, the electromagnetic shielding film 120 is a structure in which the electromagnetic shielding layer 124 is formed on one surface of the transparent support 122, the color correction film 130 of the transparent support 132 The color correction layer 134 is formed on one surface, the near-infrared shielding film 140 is a structure in which the near-infrared shielding layer 144 is formed on one surface of the transparent support 142, and the anti-reflection film 150 is a transparent support. The anti-reflection layer 154 is formed on one surface of 152.

Such a filter for a display device according to the prior art, each film requires a transparent support (122, 132, 142, 152), the anti-reflection film, near-infrared shielding film, color correction film, electromagnetic shielding film, Since the back is laminated using the pressure-sensitive adhesive layer, the manufacturing process is complicated, the productivity is lowered, there is a problem that the manufacturing cost is increased.

It is an object of the present invention to form functional layers, in particular electromagnetic shielding layers, near-infrared shielding layers, and color correction layers, each of which functions as a direct coating on a base substrate without a separate transparent support, thereby greatly shortening the production process. To provide a filter for a display device that can improve the performance and significantly reduce the manufacturing cost.

In addition, it is another object to provide a filter for a display device that can further improve the electromagnetic shielding performance by supporting a conductive film type electromagnetic shielding coating layer by containing a conductive material in the color correction coating layer.

In order to achieve the above object, the present invention provides a base substrate, an electromagnetic wave shielding coating layer which is directly coated on the surface of the base substrate to shield the electromagnetic waves, and a color correction pigment is included in the resin to any one surface of the base substrate and the electromagnetic wave shielding coating layer It includes a color correction coating layer directly coated on.

The electromagnetic shielding coating layer is composed of a conductive film type electromagnetic shielding coating layer capable of simultaneously performing electromagnetic and near-infrared shielding, and the color correction coating layer may be directly coated on the surface of the electromagnetic shielding coating layer.

A thermosetting resin may be used for the color correction coating layer, and the color correction coating layer may include at least one of a coloring pigment and a neon-cut dye.

In addition, the color correction coating layer may include a conductive material.

According to the above configuration, the present invention by directly forming an electromagnetic shielding coating layer for shielding the electromagnetic wave and near infrared rays on the surface of the base substrate, by coating a color correction material directly on the surface of the electromagnetic shielding coating layer, thereby minimizing the manufacturing process and productivity There is an advantage to improve and thus 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 the consumption of discarded subsidiary materials such as release films and the like.

Without having a separate near-infrared shielding layer, the electromagnetic wave shielding coating layer of the conductive film type shields electromagnetic waves and near-infrared rays at the same time, and the electromagnetic shielding function, which can be degraded, is effectively compensated by containing a conductive material in the color correction layer. As a result, there is an advantage that the near-infrared shielding function can be effectively achieved without ultimately lowering the electromagnetic shielding performance.

The color correction coating layer, which is a resin layer containing a dye, functions as a protective layer to protect the electromagnetic shielding coating layer of the conductive film type, which is vulnerable to moisture, as well as performing a color correction function. There is an advantage to bring.

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

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

2 is an exploded perspective view showing a display device according to a first embodiment of the present invention.

As shown in FIG. 2, 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, and a case 210 accommodated in the case 210. The driving circuit board 220 includes a display panel 230 and a filter 300 including discharge cells in which gas discharge occurs.

As shown in FIG. 3, the filter 300 according to the first embodiment of the present invention includes a base substrate 310, an electromagnetic wave shielding coating layer 320 formed on the surface of the base substrate 310, and the electromagnetic wave. And a color correction coating layer 330 formed by directly coating a color correction material on the surface of the shielding coating layer 320 or the surface of the base substrate 310.

In the filter 300 according to the present embodiment, the electromagnetic wave shielding coating layer of the conductive film type is directly formed on the base substrate 310, so that a support such as PET is unnecessary and an adhesive layer is unnecessary, thereby minimizing the manufacturing process and improving productivity. And the manufacturing cost can be minimized.

Examples of the base substrate 310 include inorganic compound moldings such as tempered or semi-reinforced glass, 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 thick.

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

The base substrate 310 preferably has high transparency and heat resistance. As for the transparency of the base substrate 310, 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.

The polymer molding may be transparent in the visible wavelength region, and specific examples thereof include acrylic, polyethylene terephthalate (PET), polysulfone (PS), polyether sulfone (PES), polystyrene, polyethylene naphthalate, and polyarylate. , Polyether ether ketone (PEEK), polycarbonate (PC), polypropylene (PP), polyimide, triacetyl cellulose (TAC), polymethyl methacrylate (PMMA), and the like, but are not limited thereto. It is not. Among them, polyethylene terephthalate (PET) is preferable in view of price, heat resistance and transparency.

As the electromagnetic wave shielding coating layer 320, an electromagnetic wave shielding coating layer of a conductive film type capable of simultaneously shielding electromagnetic waves and near infrared rays may be used.

The electromagnetic shielding coating layer 320 serves to shield strong near-infrared rays generated from the display panel 230 and cause malfunction of electronic devices such as a wireless telephone or a remote controller, and before the electromagnetic waves generated from the display panel 230 reach the viewer. It absorbs and emits electromagnetic waves to ground such as a case.

The electromagnetic wave shielding coating layer of the conductive film type is typically formed by stacking a metal thin film and a metal oxide thin film by 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 metal oxide thin film in multiple layers may be used. In addition, Nb ₂ O ₅ thin film, AZO thin film, Ag thin film, Nb ₂ O ₅ thin film of the conductive film having a basic laminated structure, Nb ₂ O ₅ thin film, AZO thin film, Ag thin film, AZO thin film, Nb ₂ O ₅ thin film Various modifications are possible, such as a conductive film having a basic laminated structure, and the like, which may also be used.

Here, the material that can be used as the metal thin film and the metal oxide thin film can be variously selected. For example, instead of Ag, gold, copper, platinum, palladium, and the like can be used. In addition, in place of the ITO, indium oxide, tin tin oxide, zinc oxide, or the like may be used. In addition, instead of the AZO, ZnO, SnO ₂ , ITO, and the like may be used.

The color correction coating layer 330 may perform a color correction function to change or adjust the color balance by reducing or adjusting the amounts of red (R), green (G), and blue (G).

The color correction coating layer may be formed by directly coating the surface of the base substrate 310 or the electromagnetic wave shielding coating layer 320 by including one or more of a coloring pigment and a neon cut pigment in the resin.

Here, the color correction coating layer 330 is preferably coated on the surface of the electromagnetic wave shielding coating layer 320. This is because the electromagnetic wave shielding coating layer of the conductive film type is vulnerable to moisture or oxidation, so that the color correction coating layer protects the electromagnetic wave shielding coating layer of the conductive film type. .

As the resin used for the color correction coating layer 330, a thermosetting resin cured by heat is preferably used. 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 color correction coating layer of the present invention, and the process time is greatly reduced. Has

In addition, the color correction coating layer 330 may include a neon-cut pigment to perform a neon-cut function. In general, red visible light generated from plasma in a display panel tends to appear orange. The color correction coating layer of the present invention performs the function of blocking the orange color light having a wavelength range of 580 ~ 600nm below a certain transmittance.

The color correction coating layer 330 uses various pigments to increase the color reproduction range of the display and to improve the sharpness of the screen. As such a dye, a dye or a pigment can 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-described coloring pigment and / or neon cut pigment, the color correction coating layer 330 may also include a near-infrared shielding pigment.

In addition, the color correction coating layer 330 may preferably 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, by supplementing the electromagnetic shielding performance of the electromagnetic wave shielding coating layer of the conductive film type described above, the conductive material is contained in the color correction coating layer to lower the sheet resistance of the entire filter to increase the electromagnetic shielding performance. Through this, the electromagnetic wave shielding coating layer of the conductive film type can be applied to FULL HD TV.

In addition, it is possible to reduce the use of Ag in the electromagnetic shielding coating 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 electromagnetic wave shielding coating layer, the color correction coating layer by a direct coating method, it is possible to achieve the cost savings by preventing the consumption of the auxiliary materials, such as the consumption of the adhesive, the release film, and the like. 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.

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

As shown, the filter of Figure 4 has a structure in which the antireflection film is adhered to the front of the filter of FIG.

The antireflection film 150 suppresses reflection of external light to improve visibility.

The antireflection layer may be formed of a thin film of i) fluorine-based transparent polymer resin, ii) magnesium fluoride, iii) silicon-based resin, iv) silicon oxide, or the like having a refractive index of 1.5 or less, preferably 1.4 or less, in the visible region. A single layer formed by the optical film thickness of / 4 wavelength can be used.

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 a prevention layer. For example, the antireflection layer 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.

Although described above with reference to preferred embodiments of the present invention, those skilled in the art or those skilled in the art without departing from the spirit and scope of the invention described in the claims to be described later Various modifications and variations can be made in the present invention without departing from the scope thereof.

1 is a cross-sectional view of a filter for a display device according to the prior art.

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

3 is a cross-sectional view of a filter for a display device according to a first embodiment of the present invention.

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

Claims (7)

A base substrate; An electromagnetic shielding coating layer coated directly on a surface of the base substrate to shield electromagnetic waves; Including a color correction pigment in the resin, including a color correction coating layer directly coated on the surface of the electromagnetic shielding coating layer opposite to the base substrate, The electromagnetic shielding coating layer is a conductive film coating layer formed by laminating a metal thin film and a metal oxide thin film in multiple layers, The color correction coating layer is a filter for a display device, characterized in that it contains a conductive material. delete delete The method of claim 1, The color correction coating layer is a display device filter, characterized in that a thermosetting resin is used. The method of claim 1, The color correction coating layer is a filter for a display device, characterized in that at least one of a coloring pigment and neon-cut pigment. delete The method of claim 1, The conductive material filter for a display device comprising at least one of carbon nanotubes, metal powder, metal oxide powder.

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