KR101285306B1 - A optical transparent composite film for the use of display and manufacturing method thereof - Google Patents

Abstract

PURPOSE: An optical transparent composite film for a display and a manufacturing method thereof are provided to have excellent optical characteristics and low coefficient of thermal expansion. CONSTITUTION: An optical transparent composite film for a display is composed of a glass fiber fabric and a nano fiber resin composite. The glass fiber fabric is made by crossly weaving wefts and warp yarns formed of a glass fiber with 1-15μm of a mean diameter. The nano fiber resin composite is impregnated on the glass fiber fabric to position between the wefts and the warp yarns of the glass fiber fabric. A manufacturing method of the optical transparent composite film for the display is as follows: a step of preparing the glass fiber fabric; a step of preparing the nano fiber resin composite by melting and extruding a thermoplastic transparent base resin and an inorganic nano fiber on the film after the thermoplastic transparent base resin and the inorganic nano fibers melt; and a step of impregnating the nano fiber resin composite on the glass fiber fabric.

Description

A optical transparent composite film for the use of display and manufacturing method

The present invention relates to an optical transparent film for a display that requires transparency, such as a display substrate, and a method for manufacturing the same. More specifically, the present invention relates to a transparent and thermal expansion coefficient by complexing a polymer resin, a glass fiber fabric, and an inorganic nanofiber having the same refractive index. The present invention relates to an optical transparent film for a display having a low coefficient of thermal expansion (CTE) and a method of manufacturing the same.

In the information age of modern times, in the video industry, mobile and convenience are aimed at freely sharing and recording information anytime, anywhere, as well as fixing and enlargement. Foldable displays are light and portable, which can meet these requirements well, so much research has been conducted on the development of flexible substrates, display methods for flexible displays, and flexible active driving devices, which are core technologies related to paper-type displays and flexible displays. It is becoming.

In the case of flexible substrates, many companies and research institutes have already been studied as an interesting topic. Transparency is good, but it is easily damaged by impact due to its lack of impact resistance, and there is a limit to thinning. In addition, the impact, weight, and thickness described above are replaced to replace conventional glass, which has a large weight per unit volume and is difficult for application as a flexible substrate. As well as solving the problems related to the light, thin, flexible, easy to be applied to the flexible substrate, for example, excellent optical properties such as polycarbonate (polycarbonate, PC), polyimide (PI), polyether sulfone (polyethersulfone, PES), polyarylate (PAR), polyethylene naphthalate (poly (ethylene naphthalate), PEN), polyethylene terephthalate (poly (ethylene terephthalate), PET), cycloolefin copolymer (cycloolefin copolymer), etc. Thermoplastic polymers, acrylic resins, epoxy resins and unsaturated polyesters. The transparent film manufactured using the polymer which hardened curable resin is used.

Such polymeric transparent films actually have very high coefficients of thermal expansion. The current display process was developed for glass with a very low coefficient of thermal expansion, so when the polymer transparent film is used in the process, large thermal expansion occurs at high temperature and large shrinkage occurs when returned to room temperature. If thermal expansion and thermal contraction occur in the manufacturing process of the display without securing the dimensional safety of the substrate, cracks, peeling, or curl may occur due to the difference in thermal expansion coefficient between the substrate and the functional coating surface. Therefore, it is difficult to maintain the barrier characteristics after the process, it is very difficult to maintain the durability and reliability of the substrate, and the arrangement of the pixels constituting the screen is disturbed screen distortion occurs, it is not able to express the display performance properly. In order to overcome the practical limitations of the polymer transparent film, the thermal expansion coefficient of the polymer transparent film must be lowered to prevent thermal expansion and shrinkage.

Looking at the existing technology for lowering the coefficient of thermal expansion, there is a method of first mixing the inorganic filler with a low coefficient of thermal expansion to the polymer transparent film. In this method, the coefficient of thermal expansion can be lowered. However, as the size and content of the added inorganic particles increase, light scatters on the surface of the inorganic particles, leading to a new problem of decreasing light transmittance.

Therefore, a method of uniformly dispersing an organic-inorganic material having a nano size such as glass fibers, carbon nanotubes, clays, organic particles, and inorganic particles having a size smaller than the wavelength range of visible light in the transparent film is proposed. However, these nano-sized materials tend to stick together due to interactions between particles (eg, van der Waals attraction). Eventually, a large number of particles may aggregate to reflect or scatter light, resulting in a decrease in optical properties.

In order to solve the above problems, a method of manufacturing an optically transparent composite film for a display having a low thermal expansion coefficient with good optical properties by impregnating a glass fiber fabric with a thermoplastic transparent base resin having the same refractive index as that of glass fibers has been devised. In general, the optical properties of the film are good and the expansion rate is lowered by the glass fiber. However, due to the difference in thermal expansion coefficient between the polymer resin and the glass fiber at the glass fiber fabric and the resin interface, small defects may occur. The possibility was raised. In order to use a polymer transparent film as a substrate of a flexible display, a film manufacturing technology that can overcome these problems must be developed.

The problem to be solved by the present invention is to solve the above problems, to provide an optical transparent composite film for a display having a good thermal properties and low coefficient of thermal expansion.

Another object of the present invention is to add an inorganic nanofiber to the polymer resin to lower the coefficient of thermal expansion of the polymer itself, thereby eliminating the possibility of thermal expansion occurring due to the difference in coefficient of thermal expansion between the glass fiber and the polymer at the glass fiber fabric and the resin interface. It is to provide a method for producing an optical transparent composite film for use.

According to one aspect of the invention,

Glass fiber fabrics in which weft and warp yarns made of glass fibers having an average diameter of 1 to 15 μm are interwoven up and down; And

Impregnated in the glass fiber fabric and comprises a nanofiber resin composite located between the surface of the glass fiber fabric and the weft and warp,

The nanofiber resin composite is provided with a transparent transparent base resin having the same refractive index as that of the glass fiber, and an optically transparent composite film for display including the inorganic nanofibers uniformly dispersed in the resin and having the same refractive index as the resin.

The weight ratio of the thermoplastic transparent base resin and the inorganic nanofibers in the nanofiber resin composite may be 1:99 to 20:80.

The weight ratio of the thermoplastic transparent base resin and the glass fiber fabric is 30:70 to 60:40, the thickness of the glass fiber fabric may be 30 to 150 ㎛.

According to another aspect of the present invention,

Preparing a woven glass fiber fabric in which weft and warp yarns made of glass fibers having an average diameter of 1 to 15 µm cross each other;

Preparing a nanofiber resin composite by melt-dispersing a thermoplastic transparent base resin and an inorganic nanofiber having the same refractive index as the glass fiber and then melt extruding it onto a film; And

There is provided a method of manufacturing an optical transparent composite film for display comprising the step of impregnating the nanofiber resin composite on the glass fiber fabric.

According to the manufacturing method of the optical transparent composite for display according to an embodiment of the present invention, the transparency is maintained as well as the impregnation method with the conventional glass fiber and exhibits the effect of excellent mechanical properties, and also the thermal expansion coefficient is lowered thermal expansion Since the rate is significantly reduced, it is possible to produce an optical transparent composite film suitable for high temperature display manufacturing process.

In addition, by adding inorganic nanofibers to the polymer resin, the coefficient of thermal expansion of the polymer itself is increased, so that the thermal expansion phenomenon caused by the difference in the coefficient of thermal expansion between the glass fiber and the polymer resin does not occur at the interface between the glass fiber fabric and the polymer resin, and the defect thereof is caused. It is possible to produce a more stable optical transparent composite film for display does not occur.

1 is a schematic plan view of a glass fiber fabric used in an optical transparent composite film for a display according to an embodiment of the present invention.
2 is a schematic cross-sectional view of an optical transparent composite film for a display according to an embodiment of the present invention.
Figure 3 is a schematic process diagram showing a method of manufacturing an optical transparent composite film for a display according to an embodiment of the present invention.
Figure 4 is a schematic process diagram showing a method of manufacturing an optical transparent composite film for a display according to another embodiment of the present invention.
5 is an SEM image of the inorganic nanofibers used in one embodiment of the present invention.
6 is a photograph taken with the nanofiber resin composite of Example 1 placed on a substrate having the i-components logo engraved thereon.
Figure 7 is a photograph taken with the glass fiber fabric used in Example 2 on a substrate bearing the logo i-components.
FIG. 8 is a photograph taken with the optical transparent composite film for display of Example 2 placed on a substrate having an i-components logo engraved thereon.

Hereinafter, the present invention will be described in detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

Hereinafter, a method for manufacturing an optically transparent composite film for a display, which not only has a low coefficient of thermal expansion according to the present invention but also composites inorganic nanofibers, impregnating a glass fiber fabric with a thermoplastic transparent base resin having the same refractive index as that of a glass fiber fabric. How to overcome the limitation of the will be described in detail.

Optical transparent composite film for a display according to an aspect of the present invention,

Glass fiber fabrics in which weft and warp yarns made of glass fibers having an average diameter of 1 to 15 μm are interwoven up and down; And

Impregnated in the glass fiber fabric and comprises a nanofiber resin composite located between the surface of the glass fiber fabric and the weft and warp,

The nanofiber resin composite includes a thermoplastic transparent base resin having the same refractive index as the glass fiber, and inorganic nanofibers uniformly dispersed in the resin and having the same refractive index as the resin.

The process of manufacturing a display includes a process that is processed at high temperatures. As described above, when thermal expansion and thermal contraction occur in the optical transparent film for display, the arrangement of the pixels constituting the screen is disturbed and screen distortion occurs, so that display performance cannot be properly expressed.

In the present invention, in order to prevent thermal expansion and thermal contraction of the plastic film, a glass fiber fabric was used. The glass fiber fabric of the present invention is a woven fabric in which weft and warp yarns made of glass fibers having a diameter of 1 to 15 µm cross each other. Glass fiber is a transparent inorganic material, has a low coefficient of thermal expansion, hardly shrinkage and expansion due to heat, and excellent mechanical properties. When the short glass fibers are added to the transparent base resin according to a general method, a portion in which the glass fibers are not uniformly dispersed in the transparent base resin is aggregated, thereby degrading the transparency of the film. In addition, glass short fibers simply dispersed in the transparent base resin is difficult to improve the mechanical properties of the desired degree in the transparent film.

However, according to the present invention, when the glass fibers are woven by weaving the weft yarn and the warp yarn up and down, there is no phenomenon that the glass fibers are aggregated in the transparent base resin, and the woven glass fiber fabric is formed. When the glass short fibers are added, the mechanical properties are improved.

Weft and warp made of glass fiber can be alternately crossed one by one each, as shown in Figure 1, the glass fiber fabric 10 may be alternately crossed up and down by several weft and warp, The pattern may also be woven into a pattern such as plain weave, twill weave, or satin weave. Two or more glass fiber fabrics may be laminated.

In the optical transparent composite film for display according to an embodiment of the present invention, the glass fiber diameter of the weft and warp constituting the glass fiber fabric may be 1 to 15 ㎛. If the diameter of the glass fiber is larger than this range, the permeation property of the film is significantly lowered due to scattering phenomenon. By adjusting the diameter of the glass fiber within the above range, this phenomenon can be minimized.

The glass fiber fabric is dispersed in the thermoplastic transparent base resin having the same refractive index as the glass fiber and the resin, and the nanofiber resin composite including inorganic nanofibers having the same refractive index as the resin is impregnated to form a composite film. .

That is, by impregnating the glass fiber fabric with the nanofiber resin composite in which inorganic nanofibers are dispersed in the molten thermoplastic transparent base resin, the nanofiber resin composite is placed between the surface of the glass fiber fabric and between the weft and warp yarns. To form a glass fiber fabric and nanofiber resin composite in the composite film is integrated with each other.

At this time, the thermoplastic transparent base resin has the same refractive index as the refractive index of the glass fiber constituting the glass fiber fabric, that is, when determining the type of the thermoplastic transparent base resin and the glass fiber, the refractive index is selected from the same material. In this way, by matching the refractive index of the materials constituting the composite transparent film, light scattering is minimized. In the present invention, "having the same refractive index" should be interpreted as having no or slight difference in refractive index to the extent that light scattering can be minimized according to the purpose of the present invention. For example, if the refractive index difference is 0.01 or less, it should be interpreted as having the same refractive index.

Examples of the thermoplastic transparent base resin include polyether sulfone, polycarbonate, polyimide, polyarylate, polyethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate glycol, polycyclohexylenedimethylene terephthalate glycol, cycloolefin copolymer, and the like. Can be used, but is not limited thereto.

2 is a schematic cross-sectional view of an optical transparent composite film for a display according to an embodiment of the present invention. Referring to FIG. 2, in the optical transparent composite film 20 for a display, the thickness of the glass fiber fabric 13 may be, for example, 30 to 150 μm, or 40 to 120 μm, or 45 to 100 μm. . In addition, the total thickness of the optical transparent composite film 20 for a display may be, for example, 50 to 500 μm, or 75 to 400 μm, or 100 to 300 μm. If the thickness of the glass fiber fabric and the optically transparent composite film for display is too thin without satisfying this range, the nanofiber composite may not be uniformly impregnated on the glass fiber fabric and light scattering may occur on the surface to maintain excellent optical properties. If the thickness is too thick, the glass fiber fabric contributes to the reduction of the coefficient of thermal expansion, and thus it may be difficult to manufacture an optical transparent composite film for a display having a low coefficient of thermal expansion. Therefore, when satisfying the range of the thickness of the glass fiber fabric and optical transparent composite film for display, the nanofiber composite is uniformly impregnated on the glass fiber fabric to prevent light scattering to maintain excellent optical properties and effectively lower the coefficient of thermal expansion Can be.

The inorganic nanofibers should match the refractive index with the thermoplastic transparent base resin dispersed to maintain the optical transparent composite film for display according to an embodiment of the present invention excellent optical properties. In this way, by matching the refractive index of the materials constituting the composite transparent film, it is possible to minimize the scattering of light.

In addition, the inorganic nanofibers should have a smaller average diameter than the wavelength range of visible light, and may have a size of up to 300 nm or less, or 5 to 300 nm, or 30 to 200 nm. Inorganic nanofibers having an average diameter smaller than the wavelength range of visible light must be uniformly dispersed in the resin to minimize the effects of scattering or reflection caused by particles to ensure transparency. The average length of the inorganic nanofibers may be 500 nm to 3 μm, or 750 nm to 2.5 μm, or 1 to 2.3 μm. Nanofibers are defined as one-dimensional flexible solid-state nanomaterials with aspect ratios of 100: 1 or more. Therefore, the length of the nanofibers should be at least 500 nm, which is 100 times the minimum diameter of 5 nm. However, if the length is more than a certain level, the transmittance may be reduced by causing scattering or reflection. Accordingly, the diameter and length of the nanofibers added are preferably included in the above range.

In addition, the weight ratio of the thermoplastic transparent base resin and the inorganic nanofibers in the nanofiber resin composite may be 1:99 to 20:80, or 5:95 to 15:85. In order to obtain a thermal expansion coefficient reduction effect by the inorganic nanofibers, at least a certain amount of inorganic nanofibers should be added. In general, however, the control of the structure of nanomaterials is quite difficult, and even in the case of nanoparticles or nanofibers, van der Waals attraction forces tend to bundle together. Accordingly, as the content of inorganic nanofibers increases, the strength of van der Waals attraction between adjacent nanofibers increases, so that the inorganic nanofibers easily aggregate. As the nanofibers aggregate and grow in size, they cause light scattering, as well as inorganic fillers, resulting in a loss of optical properties.

Therefore, when satisfying the range of the weight ratio presented above, not only the thermal expansion coefficient reduction effect can be obtained by the addition of the non-valent nanofibers, but also an excellent optical property can be maintained by controlling the distance between the inorganic nanofibers to prevent aggregation.

In addition, the inorganic nanofibers may use inorganic nanofibers having a very low thermal expansion coefficient in order to effectively lower the thermal expansion coefficient of the resin itself. In this case, the thermal expansion coefficient of the inorganic nanofibers may be 8 μm / m · ° C., or 3 to 8 μm / m · ° C. The thermal expansion coefficient of the inorganic nanofibers directly affects the reduction of the thermal expansion coefficient of the nanofiber resin composite. The lower the value, the greater the thermal expansion coefficient reduction effect of the nanofiber composite. Since the display process is currently tailored to glass materials, inorganic nanofibers with a thermal expansion coefficient of 8 μm / m · ° C or less should be used.

The inorganic nanofibers may be used without limitation as long as the inorganic nanofibers have the above-described thermal expansion coefficient, and thus can lower the thermal expansion coefficient of the resin to be dispersed. Examples of such inorganic nanofibers include carbon fibers, glass fibers, silicon carbide fibers, boron fibers, alumina fibers, silica fibers and the like depending on the chemical composition of the raw materials.

In addition, the weight ratio of the thermoplastic transparent base resin and the glass fiber fabric may be 30:70 to 60:40. In the optical transparent composite film for display, the thermoplastic transparent base composite resin is present on the surface and the opening surface of the glass fiber fabric. The amount of thermoplastic transparent base resin should be minimized in order to effectively reduce the coefficient of thermal expansion and complementary mechanical properties due to the fiberglass fabric. However, if the amount of the thermoplastic transparent base resin is reduced to 30 weight ratio or less, the glass fiber fabric may be exposed on the surface of the optical transparent composite film for display, resulting in light scattering, thereby deteriorating optical properties.

Illustrating the manufacturing method of the optical transparent composite film for a display according to an aspect of the present invention.

First, weft and warp yarns made of glass fibers having a diameter of 1 to 15 μm cross the up and down to prepare a woven glass fiber fabric. Such glass fiber fabrics can be easily prepared by those skilled in the art using a weaving machine after preparing glass fiber long fibers having a predetermined diameter.

Thereafter, the thermoplastic transparent base resin and the inorganic nanofibers having the same refractive index as the glass fibers are melt-dispersed, and then melt-extruded onto a film to prepare a nanofiber resin composite.

At this time, when the inorganic nanofibers are melt-dispersed in a thermoplastic transparent base resin, it can be compounded using an internal mixer which is a melt dispersion equipment.

In addition, the selection of the glass fiber and the thermoplastic transparent base resin having the same refractive index can be easily made by grasping the refractive index of the glass fiber and the thermoplastic transparent base resin commercially available as described above.

The process of extruding a nanofiber resin composite comprising inorganic nanofibers dispersed in a thermoplastic transparent base resin onto a film is generally well known, for example, melting a dried nanofiber resin composite in the form of chips in an extruder and then It can be extruded onto a film through the die (for example, T-die) of an extruder.

Thereafter, the nanofiber resin composite melt-extruded into a film is impregnated into a glass fiber fabric to prepare a transparent composite film having a cross section as shown in FIG. 2.

As a method of impregnating the melt-extruded nanofiber resin composite into the glass fiber fabric, the following two methods may be used, but are not limited thereto.

As a first method, as shown in FIG. 3, the nanofiber resin composite 31 melt-extruded into a film through the T-die 35 is faced with the glass fiber fabric 33 supplied from a separate winding machine. It is a method of conveying and passing between the pair of rollers 37 which are beams. Since the melt-extruded nanofiber resin composite 31 is in a molten state, the nanofiber resin composite 31 is sufficiently impregnated into the glass fiber fabric 33 by the gap pressure existing between the rollers 37. The glass fiber fabric 33 may be supplied by stacking one or two sheets, as shown in FIG. 4 by interposing a melt-extruded nanofiber resin composite between two glass fiber fabrics 33a and 33b. The transparent composite film 38 may be manufactured. On the contrary, it can also be produced by interposing a glass fiber fabric between the nanofiber resin composite melt-extruded into a film through a separate T-die.

In the second method, the nanofiber resin composite is melt extruded into a film, and then a glass fiber fabric is placed on the top surface of the film, or a film is placed between two glass fiber fabrics, and then a hot press is used. It is a method of impregnating a nanofiber resin composite film to a glass fiber fabric by heating and pressing. The hot press melts the film and impregnates the fiberglass fabric.

The finally formed optically transparent composite film for a display has excellent optical properties, not only a small coefficient of thermal expansion, but also no small defects due to no thermal expansion at the interface between the glass fiber fabric and the resin.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the following examples. However, the embodiments according to the present invention can be modified into various other forms, and the scope of the present invention should not be construed as being limited to the following embodiments. The embodiments of the present invention are provided to enable those skilled in the art to more fully understand the present invention.

Example 1

In this study, polyethylene terephthalate glycol (PETG) was used as a thermoplastic transparent base resin, and inorganic nanofibers (SiO ₂ : Al) having a refractive index of PETG and an inorganic nanofiber, an average diameter of 300 nm, and an average length of 2 μm were used. ₂ O ₃ mixed at a weight ratio of 2: 1, refractive index 1.56) was used. SEM images of the inorganic nanofibers are shown in FIG. 5.

Thereafter, the inorganic nanofibers aggregated in the form of agglomerates were mechanically pulverized using a ball mill. The crushed inorganic nanofibers were composited with polyethylene terephthalate glycol using an internal mixer which is a melt dispersion equipment. The internal mixer process conditions were a temperature of 280 ° C., twin screw 100 rpm, mixed for 5 minutes, and prepared a nanofiber resin composite having an inorganic nanofiber content of 10 wt%. The nanofiber resin composite thus prepared was melt-compressed at a pressure of 6,000 psi at a temperature of 260 ° C. in a 135 μm thick mold in two PI (polyimide) release films using a hot press. The prepared transparent film had a width of 280 mm and a thickness of 130 μm.

6 is a photograph taken by placing the thus prepared transparent film on a substrate engraved with the logo i-components.

Comparative Example 1

A transparent film was manufactured in the same manner as in Example 1 except that the inorganic nanofibers were not added. The prepared transparent film had a width of 280 mm and a thickness of 130 μm.

Example 2

The film of the nanofiber resin composite prepared in Example 1 was melted at 280 ° C. on a Teflon release film, and then a glass fiber fabric having a thickness of 47 μm cut to a size of 50 × 50 mm was placed on the film of the molten nanofiber resin composite. I was. Subsequently, the prepared Teflon release film was placed in the center space of the mold having a thickness of 135 μm with an empty center for thickness control. A 6,000 psi pressure was applied at a temperature of 280 ° C. in a hot press to impregnate the glass fiber fabric in the pole-based nanofiber resin composite to prepare a transparent composite film having a thickness of 135 μm.

Comparative Example 2

Except for using the transparent film of Comparative Example 1, a transparent composite film was prepared by impregnating with glass fiber in the same manner as in Example 2.

For the films prepared in Comparative Examples and Examples, the transmittance (550 nm) was measured using a Minolta Spectrometer (model: CM3600D), and the coefficient of thermal expansion was measured using a TMA (TMA 2940) device manufactured by TA. . The results are shown in Table 1 below.

division 550nm transmittance (%) Coefficient of thermal expansion (CTE) Example 1 More than 86% 43.4 (30 ~ 120 ℃) Comparative Example 1 over 90 66.8 (30 ~ 100 ℃) Example 2 More than 85% 10.7 (30 ~ 120 ℃) Comparative Example 2 More than 88% 12.9 (30 ~ 120 ℃)

7 is a photograph taken with the above-described glass fiber fabric on a substrate engraved with the i-components logo, Figure 8 is a photograph taken with the transparent film of Example 2 on the substrate engraved with the i-components logo.

Referring to FIG. 8 and Table 1, the transparent composite films of Examples 1 and 2 have a lower coefficient of thermal expansion than Comparative Examples 1 and 2 and show only a slight decrease in transmittance in a range that can be used as an optical film. From these results, it can be seen that the inorganic nanofibers lower the coefficient of thermal expansion of the thermoplastic transparent base resin itself and maintain excellent optical properties.

In particular, the difference between the coefficients of thermal expansion of the film in Example 2 and Comparative Example 2 is to reduce the coefficient of thermal expansion of the polymer itself by adding the inorganic nanofibers to the polymer resin as described above, thereby reducing the coefficient of thermal expansion of the glass fiber fabric (5 to 10 Results in accordance with the theory that it is possible to produce a more stable optical transparent composite film, which eliminates the possibility of thermal expansion caused by the difference in coefficient of thermal expansion between glass fiber and polymer resin at the interface of the resin and the resin and does not cause defects. Can be.

Claims (8)

Glass fiber fabrics in which weft and warp yarns made of glass fibers having an average diameter of 1 to 15 μm are interwoven up and down; And
Impregnated in the glass fiber fabric and comprises a nanofiber resin composite located between the surface of the glass fiber fabric and the weft and warp,
An optical transparent composite film for a display, wherein the nanofiber resin composite comprises a thermoplastic transparent base resin having the same refractive index as the glass fiber, and an inorganic nanofiber uniformly dispersed in the resin and having the same refractive index as the resin. The method of claim 1,
Optical transparent composite film for display, characterized in that the weight ratio of the thermoplastic transparent base resin and the inorganic nanofibers in the nanofiber resin composite is 1:99 to 20:80. The method of claim 1,
The weight ratio of the thermoplastic transparent base resin and the glass fiber fabric is 30:70 to 60:40, the thickness of the glass fiber fabric is 30 to 150 ㎛ optical transparent composite film for display. The method of claim 1,
The thermoplastic transparent base resin is composed of polyether sulfone, polycarbonate, polyimide, polyarylate, polyethylene terephthalate, polyethylene naphthalate, polyethylene terephthalate glycol, polycyclohexylenedimethylene terephthalate glycol, and cycloolefin copolymer Optical transparent composite film for a display, characterized in that any one or a mixture of two or more selected from the group. The method of claim 1,
The inorganic nanofiber has an average diameter of 100 nm or less, an average length of 500 nm to 3 μm, and a coefficient of thermal expansion (CTE) of 8 μm / m · ° C. or less. Preparing a woven glass fiber fabric in which weft and warp yarns made of glass fibers having an average diameter of 1 to 15 µm cross each other;
Preparing a nanofiber resin composite by melt-dispersing the thermoplastic transparent base resin and the inorganic nanofibers having the same refractive index as the glass fibers and then melt extruding them onto a film; And
Method for producing an optical transparent composite film for a display comprising the step of impregnating the nanofiber resin composite on the glass fiber fabric. The method according to claim 6,
Impregnating the nanofiber resin composite may include placing a glass fiber fabric on an upper surface of the nanofiber resin composite melt-extruded onto the film, or placing the nanofiber resin composite between two glass fiber fabrics. , Impregnating the base resin in the glass fiber fabric by heating and pressing using a hot press. The method according to claim 6,
The impregnating of the nanofiber resin composite may include transferring the nanofiber resin composite melt-extruded into the film between a pair of rollers facing each other with a glass fiber fabric supplied from a separate winding machine, and then And impregnating the glass fiber fabric with the thermoplastic transparent base resin by a gap pressure between rollers.

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