KR100658679B1 - Multi-layered substrate for display and display comprising the same - Google Patents

Abstract

A multi-layered substrate for display and a display comprising the same are provided to improve shock-resistant strength and scratch resistance by increasing surface hardness. A first and second substrates(10,14) are attached to each other. One or more polymer layers(12) are formed between the first and second substrates. One of the first and second substrates positioned at an outside of a display device includes a scratch-resistant material including a metal or a metal oxide. One of the first and second substrates is formed of one selected from a group including a soda line glass, a neutral borosilicate glass, and a non-alkali glass.

Description

MULTI-LAYERED SUBSTRATE FOR DISPLAY AND DISPLAY COMPRISING THE SAME}

1 is a cross-sectional view showing a multilayer substrate for a display device of the present invention.

[Technical Field]

The present invention relates to a multilayer substrate for a display device and a display having the same, and more particularly, to a multilayer substrate for a display device and a display having the same having improved impact resistance and scratch resistance.

[Private Technology]

The display panel is widely used in displays such as TVs, electronic calculators, electronic clocks, car navigation, office automation equipment, mobile phones, laptops, etc. due to its thinness.

The display includes a plasma display panel, a liquid crystal display, a field emission display, an electroluminescent display, a light emitting diode, and the like. In such a display, a material, an electrode, and the like for forming a pixel are formed on a glass substrate to form an image.

The glass base material for display apparatuses is manufactured by combining a glass raw material and melt | dissolving the combined raw material using a melting apparatus, and shape | molding to plate shape. However, such glass substrates have a weak impact resistance and thus are easily broken during the transfer process or operation.

In addition, recently, researches to replace glass substrates with plastic films having excellent impact resistance and light weight have been actively conducted, but polymers included in plastic films have sag during the panel process, and are more easily bent than glass materials. There is.

SUMMARY OF THE INVENTION An object of the present invention is to provide a multilayer substrate for a display device that can improve impact strength and scratch resistance and improve workability when transferring a substrate or forming a panel, and a display provided with the substrate.

In order to achieve the above object, the present invention includes a first substrate and a second substrate that is in close contact with each other, and at least one polymer layer existing between the first substrate and the second substrate, the first substrate and the second substrate The substrate present on the outside of the display device of the substrate provides a multi-layer substrate for a display device comprising a scratch resistant material containing a metal or a metal oxide.

In this case, the scratch resistant material may be at least one selected from the group consisting of Al, Zr, Ti, Ce, Sb, B, In, Sn, Ge, P, As, Se, Tl, Pb, Bi, and oxides thereof. Can be used.

In addition, the present invention provides a plasma display panel (PDP), a liquid crystal display (LCD), a cathode ray tube (CRT), an electric field having at least one multilayer substrate for the display device. It provides a display of a field emission diode (FED), an organic or inorganic-electroluminescent display and a light emitting diode (LED), and more preferably a flat panel display. to provide.

Hereinafter, the present invention will be described in more detail.

Conventionally, by adding a material for improving scratch resistance to a multilayer substrate for a display device, the mechanical reliability of the substrate is increased. However, when the entire glass plate is used as a glass having a composition with improved scratch resistance, there is a problem in that transmittance, refractive index, external light reflection luminance, etc. are changed by the additive.

Accordingly, in the present invention, by using a scratch resistant material for the outermost substrate in a multilayer substrate composed of two or more substrates instead of a single layer substrate, the scratch resistance is increased compared to a conventional single layer scratch resistance increasing substrate, thereby reducing the thickness of the substrate. In addition, it was possible to suppress changes in transmittance, refractive index, external light reflection brightness and the like caused by the scratch resistant material. In addition, by inserting a polymer layer having a variety of functions between the substrate it was possible to perform a variety of functions required by the type of display.

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

Referring to FIG. 1, the multilayer substrate 20 for a display device has a structure in which a polymer layer 12 is inserted between a first substrate 10 and a second substrate 14 to be closely bonded.

As the first and second substrates 10 and 14, a glass material used for a normal display may be used. Examples of the glass material include soda lime glass, neutral borosilicate glass, non-alkali glass, and the like that are commonly used.

In addition, the substrate existing on the outer side of the display device among the first and second substrates 10 and 14, and for convenience, the second substrate 14 may include a scratch resistant material in a glass composition, preferably a metal material or a metal. Oxides, and more preferably selected from the group consisting of Al, Zr, Ti, Ce, Sb, B, In, Sn, Ge, P, As, Se, Tl, Pb, Bi and oxides thereof It may include one or more. The scratch resistant material is included in an amount of 1 to 50% by weight, more preferably 3 to 30% by weight, based on the total weight of the substrate on the outer side of the display device. If the content of the scratch resistant material is less than 1% by weight, the obtained effect is insignificant and undesirable. If the content of the scratch-resistant material is more than 50% by weight, the optical properties are lowered and the manufacturing cost is increased.

The scratch resistant material enhances the bond strength between atoms in the glass, thereby increasing the surface hardness of the glass substrate, thereby improving scratch resistance due to external impact.

The first or second substrates 10 and 14 are melted by mixing a glass raw material and a scratch resistant material, and then formed into a plate by a slot down draw method, an overflow down draw method, a float method, and a roll out method. It is manufactured through a process of cutting.

The material, thickness, size, and the like of the first and second substrates 10 and 14 may be appropriately selected according to the type of display to be applied by those skilled in the art.

In addition, the first and second substrates 10 and 14 are further subjected to etching treatments such as corona treatment, flamming treatment, sputtering treatment, ultraviolet irradiation, electron beam irradiation, and the like to increase adhesion with the polymer layer 12 described later. You may.

 The polymer layer 12 is inserted between the first and second substrates 10 and 14 made of glass to disperse the pressure or force applied to the multilayer substrate 20 to thereby provide mechanical properties of the multilayer substrate 20. In addition to increasing, it also serves to enhance adhesion with the substrate, enhance strength, enhance toughness, or filter light.

The polymer layer 12 according to the embodiment of the present invention preferably has a transmittance of 90% or more, and more preferably 92 to 95%, so as to be suitably used for the substrate of the display. Compared with the first base material 10 and the second base material 14 of the glass material not applied to the polymer layer, the haze of the multilayer substrate to which the polymer layer is applied is preferably increased to less than 1%. Do.

As the polymer layer 12, any polymer may be used as long as it is transparent and easy to mold. For example, polyvinyl formals, polyvinyl acetals, and polyvinylene (poly) may be used. vinylene, polyethylene, polypropylene, polyacrylate, polymethacrylate, polycrotonate, polyacrylamide, polyvinyl alcohol ), Polyvinylchloride, polystyrene polycarbonate, polyimide, polyethersulfone, polyarylate, polyethylene naphthalate, and polyethylene terephthalate Thermosetting resin made of phthalate (polyethylene terephthalate), thermosetting such as epoxy, unsaturated polyester It may be used at least one selected from the group consisting of resin.

The thickness of the polymer layer 12 depends on the thickness of the first substrate and the second substrate (10, 14), without reducing the permeability of the first substrate 10 and the second substrate 14, It is preferred to have a thickness of 50 nm to 50 μm, preferably 1 μm to 40 μm, more preferably 20 μm to 30 μm so as to have strength and adhesion.

In addition, the polymer layer 12 is more preferably etched, such as corona treatment, flamming treatment, sputtering treatment, ultraviolet irradiation, electron beam irradiation in order to increase the adhesion with the first and second substrates (10, 14).

The polymer layer 12 may be manufactured by a conventional dry method or a wet method.

Dry methods include chemical vapor deposition, ion beam assisted vapor deposition (IBAD), plasma enhanced chemical vapor deposition (PECVD), expanded thermal plasma CVD (ETPCVD), inductively coupled plasma (ICP) or high intensity plasma using electron cyclotron resonance (ECR). Chemical vapor deposition (HIPCVD) and the like. The dry method can be formed in a film state at the same time as the deposition, there is no need for a separate polymerization process, the thickness and characteristics of the polymer layer 12 formed over the entire surface of the multi-layer substrate 20 is uniform, with a thin thickness of the ultra-thin film There is an advantage that can be manufactured.

Wet methods include spin coating, dip-coating and bar coating, and are suitable for continuous processing, casting, rolling and spray coating. Spray coating is possible. The wet method is formed in a film state by performing a separate drying and curing process using a coating solution containing a polymer, a monomer, or an oligomer as described above. In this case, the coating solution may further include a binder, a solvent, a crosslinking agent, an initiator, a dispersant plasticizer, a viscosity modifier, an ultraviolet absorber, a photosensitive monomer, and a sensitizer which are commonly used.

In addition, the curing process is dependent on the type of material contained in the coating liquid, and is carried out by applying radiation or radiation, such as conventional ultraviolet rays, electron beams or X-rays.

Hereinafter, the manufacturing method of the multilayer substrate for a display device which concerns on embodiment of this invention is demonstrated.

First, a glass raw material and a scratch resistant material are put into a continuous melting furnace, a glass raw material is melted in a melting tank, degassed in a clarification tank, and a homogeneous molten glass is manufactured.

Subsequently, the molten glass is supplied to a molding apparatus, molded into a plate shape, slowly cooled, and cut into required sizes to produce first and second substrates.

Next, at least one polymer layer is dry or wet coated on at least one of the first and second substrates, or at least one polymer layer is laminated by applying a predetermined pressure and then the remaining substrates. After lamination, it is sealed.

Meanwhile, the polymer layer interposed between the substrates according to the present invention may not only increase the strength of the glass substrate, but also change the composition of the film, or stack the polymer layers of several layers to perform a function as an optical filter. Can

Preferably, the polymer layer may be an anti-reflecting film, an NIR-cut film, an electromagnetic shielding film, a retardation plate, a viewing angle compensation film, a brightness enhancement film, a color compensation It is applicable to at least one or more selected from the group consisting of a film, and in addition, a reflector plate and a semi-transmissive reflector film or the like, which are usually used for an optical filter of a display, are also applicable.

The surface antireflection film is used to prevent reflection of external light incident on the surface of the display panel, and a high refractive index film and a low refractive index film are usually used together. The high refractive index film includes a metal oxide having a refractive index of 1.6 or more, such as ZnO, TiO ₂ , ZrO, etc., in the polymer as described above, and the low refractive index film has a refractive index such as SiO ₂ , MgF ₂ , Al ₂ O _3, etc. It is prepared in the form of a film containing the silicon organic material or fluorine organic material of 1.6 or less.

The near infrared blocking film is used to block near infrared rays that transmit visible light and hinder the resolution of the screen. The near-infrared blocking film is azo dye, cyanine dye, diphenylmethane dye, triphenylmethane dye, phthalocyanine dye, xanthene-based dye, diphenylene-based dye, indigo, porphyrin, etc. Disperse dyes to prepare a film state.

The electron shielding film is a conductive film, which disperses metals such as copper, stainless, aluminum, nickel, titanium, tungsten, tin, iron, silver, and chromium, which are conductive materials having an electron shielding effect, in the polymer as described above. Manufactured in a state.

The retardation plate is used to prevent emission of light reflected from the inside of the display panel so that the visible region is shielded over a wide wavelength range to improve the visibility and contrast of the image.

The viewing angle compensation film is intended to widen the viewing angle so that an image can be seen relatively clearly when the screen of the display device is viewed from a slightly inclined direction rather than vertically, and is produced in a film state by introducing a discotic liquid crystal into the polymer as described above. .

In this case, when the polymer layer is formed in multiple layers, an adhesive layer may be further introduced for adhesion between the respective films, and as such an adhesive layer, a polyacryl-based, silicone-based polymer, polyester-based, polyurethane-based, polyether-based alone, and copolymers thereof The polyacrylic polymer which is excellent in cohesion force, transparency, etc. among these is more preferable.

However, in order to suitably apply the multilayer substrate according to the embodiment of the present invention to a display, the multilayer substrate may transmit sufficient visible light even when the polymer layer is laminated in a single layer or a multilayer, and there should be little internal and external reflectivity. They must have high transparency and meet a certain level of durability. These properties may vary as desired, but for application to the front substrate, the multilayer substrate preferably has a transmittance of at least 20 to 80%.

As described above, the multilayer substrate having the polymer layer inserted therein capable of performing various functions is suitably introduced into a display having at least one of them. Typically, the display includes a plasma display panel (PDP), a liquid crystal display (LCD), a cathode-ray tube (CRT), a field emission diode (FED), an inorganic device. Or an organic electroluminescent display and a light emitting diode (LED), and more preferably, a flat panel display. At this time, the type of polymer layer is appropriately adjusted as required for each display.

In the multilayer substrate according to the present invention, in order to suppress the deterioration of the polymer layer due to the process heating, after manufacturing the display product using only the second substrate glass, in the case of the double layer glass, one polymer layer and the first substrate glass are bonded together. In the case of a multilayer substrate, the polymer layer and the glass are bonded in order.

The display employs at least one multilayer substrate according to the present invention, the workability increases as physical properties of the multilayer substrate are increased, and a polymer layer capable of performing various functions may be introduced to be mounted on the display. The equivalent effect can be obtained without using a filter.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only one preferred embodiment of the present invention and the present invention is not limited to the following examples.

< Example  1>

A glass substrate made of soda lime and two glass substrates containing 25% by weight of aluminum oxide were prepared, respectively, wherein the substrate was cut to a size of 360 mm × 460 mm × 0.7 mm (width / length / thickness). Used.

After the corona treatment of the surface of the substrate, it was injected into a deposition chamber to deposit an ethylene monomer to form a 500 nm thick polyethylene thin film. Subsequently, a substrate prepared separately from the substrate on which the polyethylene thin film was formed was laminated and sealed with a silicone polymer to prepare a multilayer substrate.

The visible light transmittance of the obtained multilayer substrate was measured, and the transmittance was 76%.

< Example  2>

After preparing a glass substrate made of soda lime and two glass substrates containing 15% by weight of a metal oxide in which zirconia and titania were mixed in a 1: 1 weight ratio, each surface was corona treated. At this time, the base material used was cut | disconnected in the size of 360 mm x 460 mm x 0.7 mm (width / length / thickness).

After spin coating the ethyl acrylate coating solution on the substrate, radiation was formed to form a polyethyl acrylate film having a thickness of 50 μm. Subsequently, a substrate prepared separately from the substrate on which the polyacrylate thick film was formed was laminated and sealed with a silicone polymer to prepare a multilayer substrate.

As a result of measuring the visible light transmittance of the obtained multi-layered substrate, 73% of the result was found, and it was found that it is suitably applicable to the substrate of the front panel of the display device.

For the multilayer substrates prepared in Examples 1 and 2, the light of a 20 W fluorescent lamp specially manufactured in a separate dark room was shined from the back of the multilayer substrate, and the scratch of the multilayer substrate surface was examined through the light. Depth of 1 micrometer or more and the number of scratches whose length is 2 mm or more were 100 piece / m <^2> or less was divided into "good", and the thing more than "bad".

As a result of evaluation, both of the multilayer substrates produced in Examples 1 and 2 exhibited good scratch resistance with the number of scratches of 100 / m ² or less.

The multilayer substrate for a display device according to the present invention has not only improved scratch resistance due to increased surface hardness, but also improved impact strength to improve workability when transferring the substrate or forming a panel. In addition, various materials may be added to the polymer layer so that the multi-layered substrate may perform various functions required for the display device filter, and thus, the multilayer substrate may be variously applied according to the type of display.

Claims (10)

A first substrate and a second substrate that are in close contact with each other; And At least one polymer layer present between the first substrate and the second substrate, The substrate of the first substrate and the second substrate on the outside of the display device includes a scratch resistant material comprising a metal or a metal oxide. The method of claim 1, The substrate of any one of the first substrate and the second substrate is one selected from the group consisting of soda lime glass, neutral borosilicate glass, and non-alkali glass. Multi-layered substrate for display device. The method of claim 1, The polymer layer is a multilayer substrate for a display device having a thickness of 50nm to 50㎛. The method of claim 1, The polymer layer is polyvinyl formal, polyvinyl acetal, polyvinylene, polyethylene, polypropylene, polyacrylate, polymethacrylate, polycrotonate, polyacrylamide, polyvinyl alcohol, polyvinyl chloride, polystyrene, Polycarbonate, polyimide, polyether sulfone, polyarylate, polyethylene naphthalate, polyethylene terephthalate, epoxy resin and unsaturated polyester resin selected from the group consisting of one or more of the multi-layer for display devices materials. The method of claim 1, The polymer layer is selected from the group consisting of chemical vapor deposition, ion beam assisted deposition, plasma enhanced chemical vapor deposition, expanded thermal plasma chemical vapor deposition, inductively coupled plasma and high intensity plasma chemical vapor deposition using electron cyclotron resonance; or  A multilayer substrate for a display device manufactured by one method selected from the group consisting of a spin coating method, a dip coating method, a bar coating method, a casting method, a rolling method, and a spray coating method. The method of claim 1, The polymer layer is applied to at least one selected from the group consisting of a surface antireflection film, a near infrared ray blocking film, an electron shielding film, a retardation plate, a viewing angle compensation film, a brightness enhancement film and a color compensation film. materials. The method of claim 1, The scratch resistant material is one or more selected from the group consisting of Al, Zr, Ti, Ce, Sb, B, In, Sn, Ge, P, As, Se, Tl, Pb, Bi and oxides thereof Multilayer Substrate for Devices. The method of claim 1, Wherein the scratch resistant material is included in an amount of 1 to 50% by weight based on the total weight of the substrate present on the outside of the display. A display comprising at least one multilayer substrate for at least one display device selected from claim 1. The method of claim 9, And said display is one type selected from the group consisting of a plasma display panel, a liquid crystal display, a cathode ray tube cathode ray tube, a field emission display, an electroluminescent display and a light emitting diode.

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