KR20090115028A - Optical multilayer and the display device having the same - Google Patents

Abstract

PURPOSE: An optical multilayer and the display device having the same are provided to minimize the reflection of the light on the display screen by the optics multilayered structure, and the infrared ray shielding layer and polarized light device layer. CONSTITUTION: The transparent substrate(100) is arranged to the front surface of the display device. The multilayer(200) enhances the visible ray transmittance ratio and infrared ray screen factor by a plurality of the coating. The multilayer has high refractive layers(210a,210b,210c) and low refractive layers(220a,220b,220c). The multilayer coats one side or both sides of the transparent substrate. The low refractive layer includes at least one of SiO2, and MgF2. The multilayer is comprised of 4 floors ~10 floors.

Description

Optical multilayer body and display device having same {OPTICAL MULTILAYER AND THE DISPLAY DEVICE HAVING THE SAME}

The present invention relates to a display device, and more particularly, to an optical multilayer body capable of minimizing reflection of light incident on a surface of a display panel and increasing an infrared shielding rate to prevent components from being damaged by heat. It relates to a display device.

Recently, a display device has been manufactured with a liquid crystal display (LCD), a plasma display panel (PDP), or a light emitting diode (LED) display device, which can maintain a thin thickness of the image portion.

Currently, the use of outdoor display devices, especially outdoor digital information display (DID) devices, which are installed outdoors for advertisement and display images, is increasing day by day.

In the case of the outdoor display device, since the outdoor display device is disposed to be exposed to the outside, the external light (sunlight, outdoor billboard light) is reflected from the display screen, thereby causing glare, and the appearance of the object on the display screen. have.

In addition, the outdoor display device has a problem in that the display device is overheated by solar heat, which damages the display device such as a liquid crystal phase transition.

An object of the present invention is to form a multilayer film, a near-infrared shielding layer or a polarizing element layer on a transparent substrate disposed on the front of the display device to place visible light transmittance, thereby improving the infrared shielding rate while minimizing the reflection of light incident on the display screen. It is to provide an optical multilayer body and a display device having the same that can prevent the components of the device from overheating.

In order to achieve the above object, the present invention includes a transparent substrate disposed on the front surface of the display device, and a multilayer film coated with a plurality of layers on the surface of the transparent substrate to increase the visible light transmittance and at the same time increase the infrared shielding rate, The multilayer film provides an optical multilayer body in which a high refractive index layer and a low refractive layer are repeatedly stacked, and composed of at least four layers, and the thickness of each layer is different from each other.

In addition, the present invention, a transparent substrate; A multilayer film formed of a plurality of layers on one surface of the transparent substrate to increase visible light transmittance; Provided is an optical multilayer body including an infrared shielding layer formed on the other surface of the transparent substrate to shield infrared rays.

In addition, the present invention provides an optical multilayer body, which comprises a polarizing element layer for polarizing light as an optical multilayer body disposed on the front surface of the display device.

In addition, the present invention provides a display device comprising the optical multilayer body.

In the display device according to the present invention configured as described above, by placing an optical multilayer body, an infrared shielding layer, and a polarizing element layer on the front of the display device, the visible light transmittance is placed, thereby minimizing reflection of light incident on the display screen. There is an advantage to prevent the display device from overheating by improving the.

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

1 is a cross-sectional view of a display device with an optical multilayer body according to a first embodiment of the present invention.

The optical multilayer body shown in FIG. 1 is composed of a transparent substrate 100 provided on the surface of the display panel, and a multilayer film 200 coated with a plurality of layers on the surface of the transparent substrate.

The display device of the present invention may be any one of a liquid crystal display (LCD), a plasma display panel (PDP), a light emitting diode (LED) display device, and in particular, may be a digital information display (DID) device.

The optical multilayer body is preferably applied to outdoor display devices, particularly outdoor DIDs, which are installed outdoors for advertisements and the like. In the case of an outdoor display device, since it is installed outside as it is exposed to sunlight, sunlight is reflected from the display screen, causing glare and overheating of the display panel. The optical multilayer body has a visible light transmittance. In order to reduce the reflection of light incident to the display panel and to shield infrared rays, the display panel is prevented from being damaged by solar heat.

The optical multilayer body is disposed in front of the display device, and may be disposed spaced apart from the display panel, or may be disposed to be integrally attached to the front surface of the display panel.

As the transparent substrate 100, semi-tempered glass or transparent polymer resin can be used. The polymer resin may be polyethylene terephthalate (PET), acrylic (poly), polycarbonate (Polycabonate, PC), urethane acrylate (Urethane Acrylate), polyester (Polyester), epoxy acrylate (Epoxy Acrylate), Brominated Acrylate, PolyVinyl Chloride (PVC), and the like.

The present invention includes that the front substrate of the display panel is used as the transparent substrate (100).

Preferably, the multilayer film 200 is directly coated on the surface of the transparent substrate 100, thereby preventing the multilayer film from being damaged by infrared or external environmental changes. When the multilayer film is manufactured in the form of a film and then adhered or adhered, there is an advantage in that the problem of easily damaging the film due to infrared or external environmental change of solar light can be prevented.

The multilayer film 200 according to the first embodiment has a structure in which the high refractive layers 210a, 210b and 210c and the low refractive layers 220a, 220b and 220c are repeatedly stacked. Here, the high refractive layers 210a, 210b, and 210c are layers having a refractive index of about 2.0 to 2.3, and TiO ₂ , Ta ₂ O ₅ , Ti ₂ O ₃ , Ti ₃ O ₅ , ZrO ₂ , Nb ₂ O ₅ , and Si _3. N ₄ may be used, and the low refractive layers 220a, 220b, and 220c may be SiO ₂ , MgF _2, or the like, having a refractive index of about 1.3 to 1.5.

The multilayer film 220 may be composed of at least four or more layers, preferably four to ten layers so as to increase the infrared shielding rate while increasing the visible light transmittance.

The multilayer film 200 shown in FIG. 1 has a six-layer structure. The innermost layer 210a, which is a layer directly coated on the transparent substrate 100, is composed of a high refractive layer, and the outermost layer 220c exposed to the outside. ) Is preferably composed of a low refractive layer.

The thickness of each layer of the multilayer film 200 is 10 to 200 nm, and may be formed differently.

For example, when the multilayer film 200 is formed of 10 layers, the thickness of each layer may have a different thickness as shown in Table 1 below. Here, each layer thickness shown in Table 1 below is only one test data, it can be applied in a form having a variety of different thicknesses.

   Floor         Refractive material         Thickness (nm)    10th floor SiO ₂     71.6     9th floor Ta ₂ O ₅     82.6     8th floor SiO ₂     10.8     7th floor Ta ₂ O ₅     17.5     6th floor SiO ₂     158.6     5th floor Ta ₂ O ₅     103.5     4 insects SiO ₂     21.6     3rd Floor Ta ₂ O ₅     12.0     Second floor SiO ₂     165.0     First floor Ta ₂ O ₅     8.5

As described above, the display device according to the first embodiment of the present invention can improve the visible light transmittance by 96% or more by coating the multilayer film 200 on the transparent substrate 100 disposed on the front of the display device. Reflectance can be reduced to within 4%, minimizing glare.

In addition, the multilayer film 200 may shield the infrared rays of sunlight to minimize damage such as the liquid crystal phase transition of the display device.

2 is a cross-sectional view of an optical multilayer body for a display device according to a second embodiment of the present invention.

The optical multilayer body according to the second embodiment includes a first multilayer film 300 coated on the front surface of the transparent substrate 100 and a second multilayer film 400 coated on the back surface of the transparent substrate 100.

That is, in the optical multilayer body according to the second embodiment, by coating a multilayer film on the front and rear surfaces of the transparent substrate 100, the visible light reflectance can be minimized to 1% or less and the infrared shielding performance can be further improved. do.

Since the first multilayer film 300 and the second multilayer film 400 are the same as those of the multilayer film 200 described in the first embodiment, description thereof will be omitted.

3 is a cross-sectional view of an optical multilayer body for a display device according to a third embodiment of the present invention.

The optical multilayer body according to the third embodiment includes a transparent substrate 100, a multilayer film 500 formed on the front surface of the transparent substrate 100, and an infrared shielding layer 600 formed on the rear surface of the transparent substrate 100. It is composed of

The multilayer film 500 may be directly coated on the entire surface of the transparent substrate 100 by applying the multilayer film 200 described in the first embodiment, and the AR film may be attached to minimize light reflection. That is, the multilayer film 500 may be provided with a multilayer film capable of reducing the light reflectance and infrared shielding described in the first embodiment, and an AR film for minimizing only the light reflection.

Low-e (Low Emissivity) coating layer may be used as the infrared shielding layer 600, and if necessary, the protective film 700 may be attached to the surface of the Low-e (Low Emissivity) coating layer.

The low-e coating layer may have a structure in which a metal thin film and a high refractive index transparent thin film are stacked multiple times. Here, as a metal thin film, the alloy which has silver or silver as a main component is used typically. ITO, Nb ₂ O ₅ , TiO ₂ , AZO, and the like may be used as the high refractive index transparent thin film.

When a PDP device having a large amount of electromagnetic waves is used as a display device, the low-e coating layer may be grounded to provide a shielding function to shield the electromagnetic waves from being emitted to the outside.

4 is a graph comparing visible light transmittance and visible light reflectance of a display device with an optical multilayer and a conventional display device.

As shown in the graph of FIG. 4, the light transmittance A2 of the display device with the optical multilayer body is significantly higher than the light transmittance A1 of the display device without the optical multilayer body. It can be seen that the light reflectance B2 is significantly lower than the light reflectance B1 of the display device without the optical multilayer.

5A and 5B are graphs comparing infrared shielding rates of a display device with an optical multilayer body and a conventional display device.

As shown in FIG. 5A, the infrared shielding rate A is remarkably decreased in the case of the existing display apparatus without the optical multilayer, whereas in the case of the display apparatus coated with the optical multilayer of the present invention, as shown in FIG. 5B. It can be seen that the infrared ray shielding rate B is significantly higher.

6 is a cross-sectional view of an optical multilayer body for a display device according to a fourth embodiment of the present invention.

As illustrated, the optical multilayer body of FIG. 6 includes a transparent substrate 100, a polarization layer 800, and an infrared shielding layer 600. Although not shown, depending on the required optical properties, in addition, it may include an anti-glare layer (AG), a hard coating layer, an anti-static (Anti-Static) and an anti-smudge layer (Anti-Smudge). In addition, an electromagnetic shielding layer of a conductive mesh type for shielding electromagnetic waves, an external light shielding layer having an external light shielding pattern filled with a light absorbing material, a near infrared shielding layer, a color correction layer, a diffusion layer, and the like may also be included.

 In addition, FIG. 6 illustrates an embodiment in which the transparent substrate 100, the infrared shielding layer 600, and the polarizing layer 800 are stacked from the front in which the viewer is located, but the stacking order of these layers may be variously modified. Can be.

As the infrared shielding layer 600, a low-e coating layer may be used.

When external sunlight enters the optical multilayer body, the infrared shielding layer first blocks some of the visible light and the infrared light so that the visible light and the infrared light are transmitted at a level of 90% compared to the external sunlight. Sunlight then passes through the polarization layer, where visible light and infrared light are transmitted at a level of, for example, 45% of the external sunlight, thereby minimizing damage to the display panel by infrared light.

On the other hand, for example, the screen light emitted from the liquid crystal display panel P in the already polarized state does not carry any loss while passing through the polarization layer, and is transmitted as it is while maintaining 100% of the level compared to the external sunlight, but is not shielded by infrared rays. Since the layer 600 is reduced to a level of 90% of the screen light and is transmitted to the viewer, the image quality is minimized.

Thus, the optical multilayer body of the embodiment of FIG. 6 has the advantage that external sunlight, especially infrared light, is reduced to a level of 45% to minimize damage to the display panel due to heat, while screen light is delivered to the viewer with little loss.

In the liquid crystal display device, a polarizing film (not shown) is usually attached to the front and the rear of the liquid crystal display panel, respectively, in order to prevent the loss of screen light, as described above, the polarization of the front polarizing film attached to the front of the liquid crystal display panel. The axis and the polarization axis of the polarizing layer 800 (that is, the polarizer layer 810) constituting the optical multilayer body of the present invention preferably have the same direction.

FIG. 7 is a cross-sectional view illustrating a layer configuration of the polarizing layer 800 of the optical multilayer body of FIG. 6.

As shown, the polarizing layer 800 typically includes a polarizer layer 810 for polarizing light and a polarizer protective layer 820 formed on the front and rear surfaces of the polarizer layer to protect the polarizer layer.

The polarizer layer typically has a polarization characteristic by adsorption-orientation of iodine or dichroic dye to PVA (Poly Vinyl Alchol). It is formed by stretching PVA and immersing it in a solution of iodine (I 2) or dichroic dye to arrange the iodine molecules (I 2) or dye molecules side by side in the stretching direction. Since iodine molecules (I2) and dye molecules exhibit dichroism, they absorb light oscillating in the stretching direction and transmit light oscillating in the vertical direction.

The polarizer layer 810 manufactured by a technique such as stretching of PVA film and iodine adsorption has a disadvantage in that it is basically vulnerable to the external environment. The tensile strength in the direction orthogonal to the stretching direction is so weak that it is easily broken, and the iodine-based polarizer layer does not completely solve the sublimation problem even after crosslinking by boric acid. Therefore, in order to protect such a polarizer layer, the polarizer layer is protected by bonding the polarizer protective layer 820 to both surfaces of the polarizer layer.

The polarizer protective layer 820 is typically formed by attaching a triacetyl cellulose (TAC) film, which is an isotropic film, to both surfaces of the polarizer layer 810.

Typically, the polarizer layer 810, the polarizer protective layer 820, and a phase difference layer (not shown) described later are adhered or adhered by an adhesive or an adhesive.

The polarizer protective layer may be formed for the purpose of protecting the polarizer separately from other functional layers, but may be configured so that the other functional layer also serves as the polarizer protective layer.

In some embodiments, a retardation layer may be formed in place of the polarizer protective layer, or a retardation layer may be further provided on a surface of the surface of the polarizer protective layer opposite to the polarizer layer.

The retardation layer compensates for retardation caused by different retardation values when light passes vertically and when it passes obliquely. The retardation layer is typically made of a PC or the like.

Although not shown in FIGS. 1 to 7, each layer may be adhered or adhered by an adhesive layer or an adhesive layer, except when directly coated.

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 an optical multilayer body for a display device according to a first embodiment of the present invention.

2 is a cross-sectional view of an optical multilayer body for a display device according to a second embodiment of the present invention.

3 is a cross-sectional view of an optical multilayer body for a display device according to a third embodiment of the present invention.

4 is a graph comparing light transmittances between the display device of the present invention and the existing display device.

5A and 5B are graphs comparing infrared shielding rates of the display device of the present invention and the existing display device.

6 is a cross-sectional view of an optical multilayer body for a display device according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view illustrating a layer configuration of a polarizing layer of the optical multilayer body of FIG. 6.

Claims (24)

Including a transparent substrate disposed on the front of the display device and a plurality of layers on the surface of the transparent substrate to increase the visible light transmittance and increase the infrared shielding rate, The multilayer film is an optical multilayer body characterized in that the high refractive index layer and the low refractive index layer is repeatedly laminated, and composed of at least four layers, the thickness of each layer is different from each other. The method of claim 1, The multilayer film is an optical multilayer body, characterized in that the coating on either or both of the front and rear surfaces of the transparent substrate. The method of claim 1, The high refractive layer is TiO ₂ , Ta ₂ O ₅ , Ti ₂ O ₃ , Ti ₃ O ₅ , ZrO ₂ , Nb ₂ O _{5 ,} Si ₃ N ₄ An optical multilayer body comprising any one or more of materials. The method of claim 1, The low refractive layer is an optical multilayer body characterized in that it comprises a material of any one or more of SiO ₂ , MgF ₂ . The method of claim 1, The multilayer film is an optical multilayer body comprising 4 to 10 layers. The method of claim 1, The thickness of each layer of the multilayer film is an optical multilayer body, characterized in that 10 ~ 200 nm. The method of claim 1, The layer directly coated on the transparent substrate is a high refractive layer, the outermost layer exposed to the outside is an optical multilayer body characterized in that the low refractive layer. Transparent substrates; A multilayer film formed of a plurality of layers on one surface of the transparent substrate to increase visible light transmittance; An optical multilayer body comprising an infrared shielding layer formed on the other surface of the transparent substrate to shield the infrared. The method of claim 8, The multilayer film is an optical multilayer body characterized in that the high refractive index layer and the low orange refractive index layer are repeatedly stacked in plurality. The method of claim 8, The multilayer film is an optical multilayer body, characterized in that the AR film is attached to one surface of the transparent substrate. The method of claim 8, The infrared shielding layer is an optical multilayer body characterized in that the low-e (Low Emissivity) coating layer. An optical multilayer body disposed in front of a display device, the optical multilayer body comprising a polarizing element layer for polarizing light. The method of claim 12, Optical multilayer body further comprises an infrared shielding layer for shielding the infrared The method of claim 13, The infrared shielding layer is an optical multilayer body, characterized in that the low-e coating layer. The method of claim 14, The low-e coating layer is an optical multilayer body characterized in that the metal thin film and the high refractive index transparent thin film is laminated a plurality of times. The method of claim 12, In addition to the transparent substrate, The polarizing element layer is an optical multilayer body, characterized in that laminated on the transparent substrate as a support. The method of claim 12, An optical multilayer body, wherein a polarizer protective layer or a retardation layer is formed on at least one of front and rear surfaces of the polarizing element layer. The method of claim 12, An optical multilayer body, further comprising a multilayer film formed of a plurality of layers to increase the visible light transmittance. The method of claim 18, The multilayer film is an optical multilayer body, characterized in that a high refractive index layer and a low refractive layer are repeatedly stacked a plurality of times. The method of claim 12, An optical multilayer body comprising at least one of an anti-glare layer (AG), a hard coating layer, an antistatic layer and an anti-smudge layer. 21. A display device comprising the optical multilayer body according to any one of claims 1 to 20. The method of claim 21, Display device characterized in that the outdoor display device is installed outdoors. The method of claim 22, Display device characterized in that the outdoor DID device. The method of claim 21, The display device is an LCD device, And a polarization axis of the polarization element layer has the same direction as the polarization axis of the front polarizing film attached to the front surface of the display panel of the LCD device.

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