KR101127102B1 - Flexible substrate for lcd panel having an improved color compensation and manufacturing method of the same - Google Patents

Abstract

The present invention relates to a flexible substrate for an LCD panel, and an object of the present invention is to ensure the effect of reducing the coefficient of thermal expansion and improving the surface roughness of the substrate, and at the same time selectively light in the visible region of 380nm ~ 760nm wavelength The present invention provides a flexible substrate for an LCD panel that is enhanced with a color correction function capable of absorbing the color correction function.

In the flexible substrate for LCD panel having a color correction function according to the present invention, a first film having glass cloth impregnated in a resin sheet obtained by adding and curing a neodymium complex compound to a liquid first heat resistant resin And a second film made of a second heat resistant resin is laminated on at least one surface of the first film.

LCD, flexible substrate, color correction, thermal expansion coefficient, surface roughness

Description

FLEXIBLE SUBSTRATE FOR LCD PANEL HAVING AN IMPROVED COLOR COMPENSATION AND MANUFACTURING METHOD OF THE SAME}

The present invention relates to a flexible substrate for an LCD panel and a method of manufacturing the same, and more particularly, a film in which a second film prepared in advance is laminated on at least one surface of a first film containing neodymium and impregnated with a glass cloth. The present invention relates to a flexible substrate for an LCD panel with a color correction function capable of securing a color correction function of a substrate and improving thermal characteristics and surface roughness, and a manufacturing method thereof.

Currently, the liquid crystal display device widely used uses a transparent electrode substrate made of a glass material. However, the glass substrate is difficult to thin and lighten the liquid crystal display device due to its thick thickness and heavy weight, and is vulnerable to impact resistance. In particular, the glass substrate has a limitation in implementing a flexible substrate due to the brittleness of the glass material.

Accordingly, the flexible substrate made of plastic optical film material is in the spotlight as a material to replace the conventional glass substrate, and the flexible substrate is very suitable for next-generation display devices such as liquid crystal display, organic EL, and electronic paper (e-paper). Have

Compared to the glass substrates used in conventional display panels, the flexible substrate made of plastic optical film material is thin, light, flexible, flexible, and can be processed in various forms, thereby reducing the weight, thickness, and curved surface, which are essential for next-generation display devices. The display function can be implemented.

Due to the advantages of the flexible substrate as described above, various researches and developments are being made on materials and structures of the flexible substrate.

In detail, in the initial stage of development, there is an example in which a transparent film material made of a plastic polymer is used, and an epoxy resin, an acid anhydride-based curing agent, a composition using an alcohol curing catalyst, or the like is applied as a material of the flexible substrate.

However, the flexible substrate composed of the above materials has a large coefficient of linear expansion, and especially when applied to an active matrix display element substrate, it causes problems such as warpage and disconnection of aluminum wiring in the manufacturing process, and is more resistant to heat than the glass substrate. Due to the problem of weak thermal properties such as coefficient of thermal expansion (CTE), there was a limit to use as a flexible substrate.

Therefore, in order to use the plastic optical film material as a display panel substrate, in particular, a liquid crystal display device substrate, heat resistance and high transmittance must be satisfied, and above all, a plastic optical film material having a low coefficient of thermal expansion and good surface roughness. It is essential to develop.

In accordance with such a demand, a conventionally known technique for reducing the thermal expansion coefficient of a plastic optical film material is proposed, and a composite film structure including a mixture of inorganic fillers such as glass powder or glass cloth in resin is presented. have. For example, Japanese Patent Laid-Open No. 2004-51960 discloses a resin sheet containing an epoxy resin and a glass fabric in the form of glass fabric, and Japanese Patent Laid-Open No. 2004-233851 proposes a transparent substrate made of glass cloth and resin.

However, the conventional film structure which manufactures a transparent substrate by impregnating glass cloth with resin, and its manufacturing method had the following problems.

First, the process of producing glass fibers in the form of a fabric is not simple, and especially when the film is made large by using a hot press method, the process becomes long and complicated because it causes film curl. There was a problem that the production of large films is difficult because the production cost is increased.

Second, when manufacturing a glass cloth impregnated film using UV-curing resin, the finished film is not flat surface roughness is very rough due to the structural characteristics of the glass fiber fabric and shrinkage phenomenon of the glass cloth, There has been a problem of causing a deterioration of the contrast of the panel, causing poor image quality of the display device.

Conventional display devices including PDPs and LCDs can improve the color purity and brightness of the screen by clearly dividing the boundary between the red (R), green (G), and blue (B) three primary colors that emit light.

As described above, in the visible light emitted from the driving element of the display panel, it is possible to selectively absorb visible light in the 560 to 630 nm region and visible light in the 430 to 530 nm region without disturbing the substrate transmittance. The functional film which can raise can be developed and proposed.

Japanese Laid-Open Patent Publication No. 2000-340985 discloses a method for controlling the concentration of a transparent adhesive used for bonding a member of a filter for PDP to control its concentration. In addition, Japanese Laid-Open Patent No. 2001-343520 uses a method of dispersing and applying a dye-corrected cyanine dye directly to a resin or an adhesive applied for improving mesh transparency.

However, the pigments used for color correction are poor in durability and often lose their function when exposed to heat, direct sunlight, and moisture, and there are limitations on the types of adhesive resins and coating methods that can be used. For example, Japanese Patent Application Laid-Open No. 2001-350013 discloses a pigment made of a pure organic compound, which has a disadvantage of weak durability, and also has a UV curable resin using a highly reactive peroxide initiator as described above. In the case of dispersing the organic pigment, the organic pigment may be destroyed when curing by UV occurs.

Since the possibility is very high, it is difficult to use such organic pigment | dye for UV curable resin. In addition, when the pigment material is dispersed in the polymer, the absorption wavelength region is widened, so that the absorption selectivity is lowered, and there is a problem in that it requires difficult conditions and a lot of time for the dispersion process. In addition, Japanese Patent Application Laid-Open No. 2000-340986 discloses a heat-resistant weather resistant pigment made of an organometallic compound, a metal oxide, a sulfide, and the like, which is uniformly applied to the entire surface of the filter substrate because of poor solubility in various organic solvents. Is difficult.

The present invention has been made to solve the above problems, an object of the present invention is to minimize the substrate thermal deformation and film curl generated in the high temperature liquid crystal display panel manufacturing process, and the roughness of the substrate surface ( It is to provide a flexible substrate for an LCD panel with a color correction function that can provide the best flexible substrate by preventing image quality defects caused by roughness.

Another object of the present invention, in the visible light emitted from the drive element of the display panel, do not interfere with the substrate transmittance and can selectively absorb visible light in the 560 ~ 630nm region, and visible light in the 430 ~ 530nm region, so that color purity and It is to provide a functional film capable of increasing the brightness.

The object of the present invention is to add a neodymium complex compound to a liquid first heat resistant resin and to cure the first film having glass cloth impregnated inside the resin sheet, and a second film made of a second heat resistant resin. It is attainable through the film composite structure laminated on at least one surface of the first film.

Still another object of the present invention is to provide a method for manufacturing a flexible substrate for LCD panels with enhanced color correction, comprising a first step of dissolving a neodymium salt or a neodymium complex compound in an organic solvent, and then adding and stirring the liquid to a liquid first heat resistant resin. The glass fiber is fabricated in the form of a fabric, and the glass cloth is impregnated with the first heat resistant resin, and then the liquid first heat resistant resin is cured to obtain a first film. It is possible to achieve through a second step and a third step of prefabricating a second film formed by curing the second heat resistant resin, and laminating the prefabricated second film on at least one surface of the first film. Do.

According to the flexible substrate for LCD panel reinforced color correction function according to the present invention,

Through the film composite structure consisting of a first film containing neodymium and impregnated glass cloth and a second film laminated on the first film, the effect of reducing the coefficient of thermal expansion by the first film and the second film While it is possible to ensure the effect of improving the surface roughness (Roughness), at the same time there is a remarkable effect of selectively absorbing light in the visible light region of the wavelength range of 380nm ~ 760nm to secure the color correction function.

1 is a cross-sectional view of a flexible substrate for an LCD panel with enhanced color correction function according to a first embodiment of the present invention.

1, the first embodiment of the present invention is a glass cloth (Glass Cloth) is impregnated in the heat-resistant resin, the heat-resistant resin has a film structure and composition containing a rare earth metal as the main technical features.

The flexible substrate according to the first embodiment of the present invention provides a film structure having improved thermal characteristics and color correction function of the substrate.

(1) Substrate Fabrication for Improvement of Thermal Properties

The flexible substrate of the present invention comprises a glass cloth in the form of a fabric to manufacture a glass cloth (Glass Cloth: 100), and after immersing the prepared glass cloth 100 in a liquid heat-resistant resin, the liquid heat-resistant resin is cured It has a film structure.

Therefore, the flexible substrate according to the first embodiment forms a resin sheet structure in which the glass cloth 100 is impregnated in the cured heat resistant resin 110, and the glass cloth included in the heat resistant resin 110. Due to the low coefficient of thermal expansion of the glass material, the material 100 offsets the high coefficient of thermal expansion of the heat resistant resin itself, thereby reducing the thermal deformation of the substrate generated in the panel process.

The heat resistant resin 110 uses a UV curable or thermosetting resin, and specifically, such as polysulfone, polyether, polyether lmide, and polyarylate (PAR: polyarylate) It is preferable to use at least one selected from a resin monomer having a glass transition point of 180 ° C. or higher, but is not necessarily limited thereto.

This is because when the flexible substrate according to the present invention is applied to a liquid crystal display process having a temperature of 180 ° C. or higher, it is necessary to minimize dimensional stability by minimizing substrate deformation due to the high coefficient of thermal expansion of the resin itself.

In addition, in order to apply the flexible substrate according to the present invention to a display panel requiring a transparent substrate such as a liquid crystal display device, in addition to improving physical properties to have a low coefficient of thermal expansion, optical properties such as transmittance should be considered.

This is because the substrate applied to the liquid crystal display panel has light emitted from the liquid crystal passing through the substrate to reach the user, and the glass cloth 100 is impregnated inside the resin sheet constituting the flexible substrate of the present invention. This is because a clear image can be displayed only when the refractive index difference between the resin sheet and the glass cloth 100 is minimized.

Therefore, the glass cloth 100 of the present invention should match the heat resistant resin 110 constituting the substrate with the refractive index, and specifically, the glass fiber having a difference in refractive index within ± 0.02 from the heat resistant resin 110. It is preferable to comprise with a raw material.

(2) Manufacture of substrate for reinforcing color correction function

The first embodiment of the present invention further includes the step of adding a rare earth metal to the liquid heat resistant resin before the glass cloth 100 is impregnated into the liquid heat resistant resin 110 in manufacturing the substrate for improving the above-described thermal properties. By including it, the flexible board | substrate with which the color correction function was reinforced is provided.

Rare earth metal ions, such as praseodymium, erbium, holmium and the like, or organic compounds containing them, have the property of selectively absorbing visible light in a specific wavelength band.

The rare earth metal oxide is used in the case of rare earth metal oxide, which can be mixed with soda lime glass, various tempered glass, phosphate glass, boron glass, etc., and used as a substrate, and can also be used as a salt or organometallic compound. have.

The neodymium compound in the rare earth metal absorbs light in the wavelength range of 560 ~ 630nm and has a property of absorbing a small amount of light even in the range of 430 ~ 530nm. Accordingly, it is possible to shield the boundary region of the R, G, and B light emitted from the device, which is suitable for realizing the natural colors of R, G, and B clearly.

As described above, the flexible substrate of the present invention employs neodymium among rare earth metals, and the neodymium is preferably used in the form of a salt or an organometallic compound.

When using neodymium in the salt state, there is a method of forming a resin monomer containing a neodymium salt or adding a rare earth salt to a preformed resin monomer.

However, neodymium, which is present in the salt state, is excellent in durability but insoluble in organic solvents, so that it is difficult to disperse in various organic solvents or organic monomers prior to copolymerization, and thus, the substrate transmittance and color correction function may be reduced. .

Therefore, it is preferable to form a substrate by dispersing and containing a neodymium compound present in a metal complex instead of a salt neodymium in a liquid heat-resistant resin.

Hereinafter, a preferred embodiment of forming the flexible substrate of the present invention using neodymium in the form of an organometallic complex will be described in detail.

The method of containing neodymium in the form of an organometallic complex is to form the flexible substrate of the present invention by dissolving the neodymium compound 300 in a metal complex state in an organic solvent, and then adding and curing the mixture to a liquid heat resistant resin 110. It is to obtain a resin sheet.

In addition, the liquid heat-resistant resin 110, the mixture of the neodymium complex compound 300 is completed is cured using a UV curing initiator, etc. In this case, even if the structure of the neodymium complex compound 300 is destroyed, the color correction function is applied to the neodymium ion There is no big problem because it is done by.

Although the kind of neodymium compound which comprises the flexible substrate of this invention is not specifically limited, It is good to select an appropriate thing in consideration of economy, productivity, and dispersibility.

Specifically, it is preferable to use a neodymium complex compound bonded to phthalocyanine or ethylenediaminetetraacetic acid (EDTA), or to use a neodymium compound to which a saturated or unsaturated hydrocarbon ring, alkoxide-based or amine-based ligand is attached.

In addition, the lower the polarity of the ligand, the easier it is dissolved in an organic solvent, so neodymium 2,2,6,6-tetramethyl-3,5 heptanedionate (Neodymium (2,2,6,6-tetramethyl-3,5 heptanedionate ) _3; Nd), it is more preferred that neodymium isopropoxide side configuration and neodymium 2,4-pentanedionate _{(Nd (CH 3 COCHCOCH 3)} 3) at least any one selected from the.

The heat resistant resin 110 containing the neodymium organometallic complex 300 dispersed therein is a UV-curable resin or a thermosetting resin as described above, and a polysulfone, a polyether, a polyether imide and a polyarylene having a transition point of 180 ° C. or more. At least one selected from the group consisting of resin monomers, and the neodymium content in the copolymer when the monomer is copolymerized is preferably included in the range of 0.01 to 40% by weight of neodymium based on the weight of the copolymer, more preferably Preferably it is configured to include in the range of 0.04 to 20% by weight.

When the neodymium 300 contained in the heat resistant resin 110 is lower than the content range, the absorption effect of the wavelength band is insignificant, so that it is difficult to fully realize the color correction function. This is because the acidity may be lowered, thereby lowering the substrate transmittance and causing poor image quality.

Table 1 shows embodiments of the flexible substrate according to the present invention manufactured using the method described above and measured data of respective transmittances.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 UV Curing Resin (wt%) 95 90 85 80 Curing Resin (wt%) 95 90 Nd content (wt%) 5 5 10 10 15 20 Transmittance (%) 380 ~ 760nm 88 89 85 86 83 81

Examples of heat resistant resins in Examples 1 to 6 of Table 1 include bisphenol A ethoxylate diacrylate UV curable resins having the structure of Formula 1, polyaryl having the structure of Formula 2, and having a transition point around 320 ° C. Poly Arylate-based thermosetting resins were optionally used.

In addition, the neodymium metal complex contained in the selected UV curable resin or thermosetting resin is neodymium 2,2,6,6-tetramethyl-3,5 haptandioonate from Sigma Aldrich (Neodymium (2,2,6,6-tetramethyl). -3,5 heptanedionate) 3; Nd)) was dissolved in a toluene solvent, and then mixed with the same weight as in Examples 1 to 6 with respect to 100 parts by weight of the resin, stirred until sufficient dispersion was achieved, and then cured. The flexible substrate of the present invention was prepared.

For the prepared substrate, the degree of selective light absorption was measured by measuring the light transmittance in the 380 ~ 760nm region using a UV spectrometer.

Unlike the flexible substrate composition according to the present invention, the flexible substrate obtained by curing the glass cloth after immersing the glass cloth in the liquid heat-resistant resin used in the embodiment of the present invention does not contain a neodymium metal complex. The average is around 90%.

However, it can be seen that the flexible substrate of the present invention containing the neodymium metal complex compound exhibits light transmittance of about 81 to 89% in the visible region.

This means that the average light transmittance of the substrate is reduced because the neodymium metal complex contained in the heat resistant resin constituting the flexible substrate of the present invention absorbs light in the wavelength range of 560-630 nm and 430-530 nm. Able to know.

In addition, as the content (wt%) of the neodymium metal complex added to the heat resistant resin increases, the light transmittance decreases, and in Example 6 configured to contain 20 wt% of neodymium, the light transmittance drops to 81%.

However, in the case of a liquid crystal display device, a transparent substrate having a light transmittance of 85% or more is generally required to realize good image quality.

Therefore, as shown in Table 1, when constructing a flexible substrate for application to a liquid crystal display device, the neodymium content in the copolymer when copolymerizing the resin monomer so that the neodymium content based on the copolymer weight does not exceed 20% by weight It can be seen that it is preferable to configure.

Hereinafter, specific wavelength bands in which selective light absorption is intensively generated in the light transmittances shown in the examples of Table 1 will be described.

2 and 3 are light transmission spectrum graphs of the flexible substrate manufactured according to the above-described method. Specifically, the heat resistant resin is a UV curable resin, and the UV curable resin is 0.04 to 20 wt% of a neodymium metal complex. The light transmittance per wavelength was measured from the board | substrate comprised so that it might contain in the range.

As shown in FIGS. 2 and 3, the flexible substrate according to the first embodiment of the present invention absorbs light in a wavelength range of 560 nm to 630 nm and absorbs a small amount of light even in a range of 430 nm to 530 nm.

As described above, the flexible substrate according to the first embodiment of the present invention has a structure in which a glass cloth is impregnated in the heat resistant resin forming the substrate, and the substrate is formed of neodymium organometallic in a liquid heat resistant resin. By adding and curing the complex compound, the thermal expansion coefficient of the flexible substrate can be reduced, and the boundary region of the R, G, and B light emitted from the element can be shielded while ensuring the proper transmittance of the substrate, thereby clearing the natural colors of R, G, and B. It will provide the benefits that can be implemented.

The preferred embodiment of the present invention described and illustrated above includes a neodymium compound in a heat resistant resin and impregnated glass cloth to form a film substrate having a color correction function, but the same through the modified film substrate as follows. The effect may also be achieved.

That is, after manufacturing the glass cloth containing the neodymium compound of this invention, you may comprise the film substrate of the structure which impregnated it in the heat resistant resin.

Specifically, the glass fiber to which the neodymium compound is added by curing and adding the neodymium compound of the present invention to the liquid glass composition through the above-described method in the manufacture of the glass fiber constituting the glass cloth (Glass Cloth) It can be obtained, and by weaving it can be produced a glass cloth containing the neodymium compound dispersed.

The film substrate (hereinafter referred to as "1-1 film") having a color correction function can be configured in the same manner as in the first embodiment of the present invention by immersing and curing the produced glass cloth in a liquid heat resistant resin. In addition, the heat resistant resin which comprises the said 1-1 film uses at least any one selected from the same heat resistant resin as 1st Example.

In addition, when the neodymium compound is added to the liquid glass composition to prepare the glass fibers, the glass cloth may be prepared by adding the neodymium oxide, preferably in the form of neodymium oxide such as Nd ₂ O ₃ or Nd ₂ O ₅ .

The neodymium oxide is a very effective component for selectively absorbing and transmitting red, green and blue wavelength light, and the content of neodymium oxide contained in the glass cloth is in the range of 0.01 to 40% by weight as in the first embodiment. It is preferable to be.

4A to 4C are views illustrating a manufacturing process of a flexible substrate for a display panel according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of the flexible substrate manufactured through the manufacturing process of FIG. 4. to be.

In the above-described preferred embodiment, the film substrate configured to contain the glass cloth in the impregnated state is referred to as a first film, and the heat resistant resin constituting the first film is referred to as a first heat resistant resin. do.

A second embodiment of the present invention is a film composite structure in which a second film obtained by curing a liquid second heat resistant resin is laminated on at least one surface of a first film manufactured according to the first embodiment, which is a first composite. It provides an advantage of improving the surface roughness (Roughness) of the substrate while at the same time ensuring the effect of the embodiment.

Hereinafter, a second embodiment of the present invention will be described in detail with reference to FIGS. 4 and 5.

(1) first film production

In the first film constituting the flexible substrate of the second embodiment according to the present invention, glass cloth is impregnated into the first heat resistant resin, as in the first embodiment described above, and the first heat resistant resin is neodymium. It consists of the film structure in which a metal satisfy | fills content of a predetermined range, and is contained. Detailed description will be omitted.

(2) second film production

It is preferable to comprise the thickness of the 2nd film 200 of this invention to thickness thinner than the thickness of a 1st film. This is because when the thickness of the second film 200 exceeds the thickness of the first film, the effect of reducing the thermal expansion caused by the first film is canceled by the second film 200 so that the coefficient of thermal expansion rises again. This is because a problem of deterioration of stability may occur.

In view of the foregoing, the first film according to the preferred embodiment of the present invention is configured to have a thickness of 10 ~ 70㎛, the second film 200 laminated to the first film is 10 to 50 It is preferably configured to have a μm, the intermediate material 120 is applied between the first film and the second film 200 is preferably configured to have a 0.5 ~ 5㎛.

That is, the flexible substrate according to the second embodiment of the present invention is thermal expansion by the first film through the organic bonding of the first film composed of a thickness of 10 ~ 70㎛ and the second film composed of a thickness of 10 ~ 50㎛ It has the structure which can ensure the coefficient reduction effect and color correction function, and also ensure the surface roughness improvement effect by a 2nd film.

In addition, the pre-fabricated second film 200 is composed of a second heat-resistant resin without birefringence, the second heat-resistant resin is excellent in flatness, the transmittance of the film is 85% or more, Haze (Haze) Any resin may be used as long as it satisfies 4.6 or less and has a glass transition point of 160 ° C. or higher.

Specifically, the second heat resistant resin is a UV curable or thermosetting resin, and has a glass transition point such as polysulfone, polyether, polyether lmide, and polyarylate (PAR). It is preferable to use at least one selected from heat-resistant resins of 180 ° C. or higher, but is not necessarily limited thereto.

(3) intermediate material application step

When the manufacture of the first film and the second film is completed, a process of applying the intermediate material 120 on both outer surfaces of the first film is required. The intermediate member 120 is a means for laminating the second film 200 of the present invention to the first film, it is preferable to use a UV-curable or thermosetting resin like the first film, More preferably, the intermediate member 120 of the present invention may be made of the same resin as the first heat resistant resin 110 constituting the first film.

For example, if a polyarylate-based resin was used in manufacturing the first film, the intermediate material 120 may also use a polyarylate-based resin.

This is to achieve the best optical performance of the liquid crystal display by stacking a material having the same refractive index as that of the heat resistant resin 110 constituting the first film on the first film.

The intermediate member 120 is preferably coated with a minimum thickness capable of stably bonding the second film 200 to the first film, and specifically, the intermediate member 120 having a thickness of 0.5 to 5 μm may be applied to the first film. It is good to apply on a film. When the thickness of the intermediate material 120 is applied to a thickness of less than 0.5㎛ it is not possible to secure a sufficient adhesive force occurs a problem that the second film 200 can not be stably laminated on the first film.

In addition, when the intermediate substrate 120 having a thickness of 5 μm or more is applied to the first film having a thickness of 20 to 70 μm to form the flexible substrate of the present invention, a high coefficient of thermal expansion of the intermediate material 120 composed of a heat resistant resin Therefore, the effect of reducing the coefficient of thermal expansion due to the first film may be canceled, thereby reducing the dimensional stability of the substrate, and causing a decrease in transmittance of the substrate and an increase in haze, thereby damaging the optical characteristics of the flexible substrate.

Therefore, when applying the flexible substrate of the present invention to a display panel (for example, organic EL) that does not need to consider the optical characteristics of the substrate, since the transmittance of the intermediate member 120 does not need to be considered, the intermediate member is specifically a first film There is no need to limit to the heat-resistant resin constituting the, and of course, various intermediate materials such as a transparent adhesive or a pressure-sensitive adhesive (PSA) can be applied.

(4) Laminating of Prefabricated Second Film

One of the main technical features of the flexible substrate according to the second embodiment of the present invention is a film composite structure in which the prefabricated second film 200 is laminated to compensate for the surface roughness problem of the first film.

That is, after preparing and preparing a solid resin film having a sufficiently flat surface in advance, rather than a method of forming another coating layer by applying and curing a liquid resin on the first film, the solid resin film is prepared as an intermediate material. Laminating to the first film using 120.

Since the second film 200 of the present invention is not a substrate structure in which a liquid resin is applied to the first film and then cured, the second film 200 is impregnated between different materials (for example, glass cloth of the first film and the first heat resistant resin). Does not occur, and thus there is an advantage in that the refractive index matching with the material existing in the lower layer of the second film 200 does not need to be specifically considered. That is, the second heat resistant resin usable in the present invention may have a refractive index difference of more than 0.02 from the first heat resistant resin. Therefore, the second heat resistant resin may be formed of a material different from the first heat resistant resin, and in some cases, may be formed of the same material. Accordingly, the type of the applicable resin is diversified, which has the effect of bringing down the manufacturing cost.

The second film 200 according to the present invention corresponds to a component for compensating the surface roughness problem of the first film for improving the thermal characteristics of the substrate. However, when the second film 200 is configured to have an appropriate thickness or more, the coefficient of thermal expansion due to the second film 200 itself is increased to offset the effect of reducing the thermal expansion caused by the first film, thereby impairing the dimensional stability of the flexible substrate. Problems may arise.

Therefore, the second film 200 of the present invention should be configured to a thickness that can improve the surface roughness while ensuring maximum thermal expansion reduction effect by the first film.

Therefore, the thickness of the second film 200 is composed of a thickness thinner than the thickness of the first film, specifically, the second film laminated to the first film corresponding to the thickness of 10 ~ 70㎛ of the first film It is preferable to configure 200 to have 10-50 micrometers.

After the solidified second film 200 is laminated on the first film to which the intermediate member 120 is applied, the second film 200 is laminated to the first film through a heating and curing process. After the ultraviolet ray (UV) is irradiated to the intermediate member 120, the resin is cured, and the second film 200 is laminated on the first film.

In the above embodiment, a structure for laminating the second film on the first film using the intermediate material is provided, but a structure in which the second film is directly laminated on the first film without using the intermediate material is also possible. In this case, the interface between the first film and the second film is thermally cured or UV cured to adhere or bond.

Hereinafter, another embodiment (hereinafter, referred to as embodiment 2-1) for improving the thermal characteristics of the second film itself according to the present invention will be described.

The second film 200 according to the present invention may further improve the dimensional stability of the substrate by adding an additive to the second heat resistant resin to lower the coefficient of thermal expansion of the second film 200. That is, by pre-production of the second film 200 of the present invention by dispersing the inorganic particle filler 320 in the liquid second heat-resistant resin to improve the thermal properties and dimensional stability of the second film 200.

As the inorganic particle filler 320, it is preferable to use ultrafine ceramic powder in which a refractive index of the flexible substrate is matched with the resin constituting the flexible substrate. Specifically, it is preferable to use a ceramic powder having a difference in refractive index within ± 0.01 from the resin constituting the flexible substrate and having a particle size of at least 200 nm or less and preferably 100 nm or less.

The substrate applied to the liquid crystal display panel has a light emitted from the liquid crystal passing through the second film 200 to the user, the inorganic particle filler (2) inside the second heat resistant resin constituting the second film (200) Due to the structural characteristics containing 320, the difference in refractive index between the inorganic particle filler 320 and the resin 200 should be minimized to prevent the occurrence of poor image quality.

In addition, when the particle size of the inorganic particle filler 320 used is larger than 200 nm, since the light is scattered at the interface with the resin due to the particle size and haze increases, the inorganic particle filler having a particle size of at least 200 nm or less. Preference is given to using.

The inorganic particle filler 320 uses an inorganic particle filler having a low thermal expansion coefficient so as to lower the thermal expansion coefficient of the second film 200. Specifically, the ultrafine ceramic powder having a thermal expansion coefficient (CTE) of 8 ppm or less is used. It is good.

The content of the inorganic particle filler dispersed in the second film 200 is not particularly limited as long as it satisfies optical properties such as transmittance and haze required by the display device.

As described above, the second film 200 containing the inorganic particle filler 320 has an effect of canceling the high coefficient of thermal expansion of the second film 200 itself due to the low coefficient of thermal expansion of the inorganic particle filler. Therefore, the problem that the dimensional stability of the substrate is lowered by the second film 200 can be eliminated.

In addition, the second embodiment of the present invention by constructing a substrate such that the second film described and illustrated in the second and second embodiments is laminated on at least one surface of the above-described first-1 film. And the same object and effect as the embodiment 2-1 can be achieved.

6 is a cross-sectional view of a substrate showing a third embodiment of a flexible substrate according to the present invention. Referring to FIG. 6, the third embodiment of the flexible substrate according to the present invention is manufactured by basically the same method as the above-described second embodiment, and the intermediate member 120 is applied only to one side of the first film. 2 film 200 is also characterized in that the bonding bonding only on one side of the intermediate material 120 is applied. The flexible substrate according to the third exemplary embodiment basically exhibits the same effect as the first exemplary embodiment, but corresponds to a substrate structure in which the thermal characteristics of the substrate are considered more than the contrast due to the improvement of the surface roughness.

Examples 1 to 6 shown in Table 2 are measured data of the coefficient of thermal expansion and the surface roughness of the film composite in which the second film is laminated and bonded to the first film prepared according to the first embodiment of the present invention.

Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 First film thickness (㎛) 20 30 40 50 30 40 Second film thickness (㎛) 20 30 40 10 20 20 Thermal expansion coefficient ppm / ℃ 13 17 19 15 16 17 Surface roughness (nm) 25 14 12 17 22 19

In the example of Table 2, a bisphenol A ethoxylate diacrylate UV curable resin was used as the first heat resistant resin, and the second heat resistant resin was a polyurethane resin as a thermosetting resin having a transition point around 320 ° C. An arylate resin was used.

The embodiments of Table 2 consider the 50 to 100 μm corresponding to the thickness for the display device to implement the best flexible function, the thickness of the first film is set in the range of 20 to 50 μm, and the second film The thickness of 200 was set in the range of 10 to 40 μm.

As shown in Table 2, the flexible substrate of the present invention, which forms the film composite through the organic bonding of the first film and the second film, has a surface roughness of 12 nm while maintaining a coefficient of thermal expansion of 20 ppm / ° C. or lower. It can be seen that it can be improved.

In addition, the flexible substrate according to the second embodiment of the present invention can secure the above-described thermal characteristics and surface roughness improvement effect, and at the same time can reinforce the color correction function by the neodymium compound contained in the first film. Provide strength

In addition, the manufacturing method is very simple, it is possible to prevent the curl (curl) generated by the expansion and contraction of the substrate is easy to enlarge the size and has the advantage of improving the productivity.

In the above, although the preferred embodiment of the present invention has been described and illustrated, it is obvious that various changes and changes can be made without departing from the spirit and scope of the following claims. Such modified embodiments should not be understood individually from the spirit and scope of the present invention, but should fall within the claims appended to the present invention.

1 is a cross-sectional view of a flexible substrate for an LCD panel with enhanced color correction function according to a first embodiment of the present invention.

2 and 3 are light transmission spectrum graphs of the flexible substrate manufactured according to the first embodiment of the present invention.

4A to 4C are views illustrating a manufacturing process of a flexible substrate for a display panel according to a second embodiment of the present invention.

5 is a cross-sectional view of the flexible substrate manufactured through the manufacturing process of FIG. 4.

6 is a cross-sectional view of a substrate showing a third embodiment of a flexible substrate according to the present invention;

** Description of symbols for the main parts of the drawing **

100: glass cloth 110: heat resistant resin

120: intermediate material 200: second film

300: neodymium compound 320: inorganic particle filler

Claims (18)

In the flexible board for LCD panels, The substrate is configured to include a first film impregnated with glass cloth (Glass Cloth) inside the resin sheet obtained by adding and curing a neodymium salt or a neodymium complex compound to the liquid first heat resistant resin, The first heat resistant resin is at least one selected from polysulfone, polyether, polyether imide and polyarylate having a glass transition point of 180 ° C. or more, The substrate is composed of a film composite structure in which a second film, which is prefabricated with a second heat resistant resin, is laminated on at least one surface of the first film, It is further provided between the first film and the second film is an intermediate material which is applied on the first film to adhere or adhere the first film and the second film, And said intermediate member is made of said first heat-resistant resin. The method of claim 1, The neodymium complex compound is a neodymium complex compound bound to phthalocyanine or ethylenediaminetetraacetic acid (EDTA), or a neodymium complex compound having a saturated or unsaturated hydrocarbon ring, an alkoxide group, or an amine ligand attached thereto. Flexible board for LCD panel. The method of claim 1, The neodymium complex is neodymium 2,2,6,6-tetramethyl-3,5 heptane dionate (Neodymium (2,2,6,6-tetramethyl-3,5 heptanedionate) ₃ ; Nd), neodymium isopropoxide And neodymium 2,4 pentanedionate (Nd (CH ₃ COCHCOCH ₃ ) ₃ ), wherein the flexible substrate for a color correction enhanced LCD panel is configured. The method of claim 1, The neodymium complex compound added to the first heat-resistant resin is a flexible substrate for a color correction function enhanced LCD panel, characterized in that it is contained in an amount of 0.01 to 40% by weight. delete delete delete The method of claim 1, The second heat resistant resin is at least one selected from polysulfone, polyether, polyether imide, and polyarylate (PAR: polyarylate) having a glass transition point of 180 ° C. or more. Flexible board for LCD panels with enhanced color correction. The method of claim 1, The difference in refractive index between the first heat resistant resin constituting the first film and the glass cloth is within ± 0.02, wherein the color correction function-enhanced LCD panel flexible substrate. The method of claim 1, The second film is a flexible substrate for LCD panel reinforced with color correction, characterized in that the ultrafine ceramic powder is dispersed by containing. The method of claim 10, The ultrafine ceramic powder has a difference in refractive index within ± 0.01 from the second heat resistant resin, has a particle size of 200 nm or less, and a thermal expansion coefficient of 8 ppm / ° C. or less for an LCD panel with enhanced color correction. Flexible substrate. In the flexible board for LCD panels, The substrate is a glass cloth obtained by adding and curing a neodymium compound in a liquid glass composition to produce a glass fiber, and then weaving it, And a 1-1 film prepared by immersing the glass cloth in a liquid heat resistant resin to cure the flexible cloth. 13. The method of claim 12, The neodymium compound is Nd ₂ O ₃ or Nd ₂ O ₅ Flexible substrate for a LCD panel reinforced with color correction, characterized in that. 13. The method of claim 12, The substrate is a flexible substrate for a color correction function reinforced LCD panel, characterized in that the second film pre-fabricated with a heat-resistant resin is a film composite structure laminated on at least one surface of the 1-1 film. A method for manufacturing a flexible substrate for an LCD panel with enhanced color correction, A first step of dissolving a neodymium salt or a neodymium complex compound in an organic solvent, and then adding and stirring the liquid to the liquid first heat resistant resin; And A glass cloth is prepared by forming a glass cloth into glass cloth, and the glass cloth is impregnated in the first heat resistant resin, and then the liquid first heat resistant resin is cured to obtain a first film. Including steps The first heat resistant resin is at least one selected from polysulfone, polyether, polyether imide and polyarylate having a glass transition point of 180 ° C. or more, Further comprising a third step of prefabricating a second film formed by curing a second heat resistant resin, and laminating the prefabricated second film on at least one surface of the first film, Between the second step and the third step, further comprising the step of applying an intermediate material for adhering or adhering the first film and the second film on top of the first film, The intermediate member is a flexible substrate manufacturing method for LCD panel reinforced color correction, characterized in that the first heat-resistant resin made of. delete delete The method of claim 15, The second film is a method of manufacturing a flexible substrate for an LCD panel with a color correction function, characterized in that the laminating bonding on the first film through a method of ultraviolet (UV) or heat curing the intermediate material.

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