WO2016122282A1 - Anti-glare film, and polarising plate and display device comprising same - Google Patents

Abstract

The present application relates to an anti-glare film that improves contrast, external black visual rays, and viewing angle of a display by controlling a transmittance spectrum. The present application relates to an anti-glare film that has a minimum point of transmittance of 560 nm or more in the transmittance spectrum of between 500 nm and 800 nm and that has a transmittance of 60% to 96% with respect to the standard illuminant D65, and a polarising plate and a display device comprising the same.

Description

Anti-glare film, polarizing plate and display device including the same

The present application relates to an anti-glare film. The present application also relates to a polarizing plate and a display device including glare. This application claims the benefit of the filing date of Patent Application No. 10-2015-0015698 filed with the Korean Intellectual Property Office on January 30, 2015, the entire contents of which are incorporated herein.

Recently, as a display device is used not only for a TV or a computer but also for various uses such as a touch panel, a large screen, or a portable device, a display device has been developed to have various functions. Accordingly, attempts have been made to change or improve the structure of the device, to improve the performance of parts such as optical films, and to use additional parts such as functional optical films so that the display device provides various functions.

The liquid crystal panel of the conventional liquid crystal display device has a structure including a liquid crystal cell, a thin film transistor provided on one side of the liquid crystal cell and a color filter provided on the other side of the liquid crystal cell. Recently, a color filter on TFT (COT) structure is used as a liquid crystal panel of a liquid crystal display device. The stacking order of each configuration is illustrated in the apparatus having the COT structure in FIG. 1. According to FIG. 1, a liquid crystal panel having a structure in which a thin film transistor, a curling filter, and a liquid crystal cell are sequentially stacked is provided, and polarizing plates provided at both sides thereof.

MEANS TO SOLVE THE PROBLEM The present inventors discovered that when using the liquid crystal panel of a COT structure, the reflectance inside a panel was made high by the metal contained in an electrode etc., and the optical characteristic of a display, such as external black vision and contrast, fell, and came to this invention.

One embodiment of the present application provides an anti-glare film having a minimum point of transmittance at 560 nm or more of the transmission spectrum between 500 nm and 800 nm.

According to another exemplary embodiment of the present application, the anti-glare film includes a transparent film and a coating layer provided on at least one surface of the transparent film, wherein the coating layer is 560 nm or more in the transmission spectrum between 500 nm and 800 nm It has a minimum point of permeability. For example, the coating layer includes a light absorber that absorbs at least a portion of wavelengths selected from 560 nm to 800 nm. Here, the transparent film, the coating layer or a laminated structure thereof has an anti-glare function.

According to another exemplary embodiment of the present application, the transparent film or the coating layer may further serve as a hard coating layer, an antireflection layer or a low reflection layer.

According to another exemplary embodiment of the present application, the anti-glare film includes a light absorbing agent that absorbs at least a portion of wavelengths selected from 560 nm to 800 nm dispersed in the transparent film and the transparent film. Here, the transparent film has an anti-glare function.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer absorbs at least a portion of wavelengths selected from 560 nm to 800 nm, or 560 An additional layer is provided between the transparent film and the coating layer that includes a light absorber that absorbs at least some wavelengths selected from nm to 800 nm.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer absorbs at least a portion of wavelengths selected from 560 nm to 800 nm, or 560 An additional layer comprising a light absorber absorbing at least a portion of wavelengths selected from nm to 800 nm is provided between the transparent film and the coating layer, wherein the transparent film may be a hard coat layer.

Another embodiment of the present application provides an anti-glare film having a transmittance of 60% to 96% for the standard light source D65.

According to another exemplary embodiment of the present application, the anti-glare film includes a transparent film and a coating layer provided on at least one surface of the transparent film, and the coating layer has a transmittance of 60% to 96% with respect to the standard light source D65. To this end, the coating layer may include a black or blackening material. The black material itself means black color, and the blackening material means a material that can lower the transmittance due to absorption of light even though the black color material is not black. Here, the transparent film, the coating layer or a laminated structure thereof has an anti-glare function.

According to another exemplary embodiment of the present application, the coating layer having a transmittance of 60% to 96% for the transparent film or the standard light source D65 may serve as a hard coating layer, an antireflection layer, or a low reflection layer.

According to another exemplary embodiment of the present application, the anti-glare film includes a transparent film and a black or blackening material dispersed in the transparent film. Here, the transparent film has an anti-glare function.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer includes a black or blackening material, or an additional layer including a black or blackening material. And between the coating layer.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer includes a black or blackening material, or an additional layer including a black or blackening material is the transparent film. It is provided between and the coating layer, the transparent film may be a hard coating layer.

According to another exemplary embodiment of the present application, the anti-glare film according to the aforementioned exemplary embodiments is a polarizing plate protective film, a retardation film, a brightness enhancement film, or a surface protection film.

Another embodiment of the present application includes a polarizer, and a polarizing plate protective film provided on at least one surface of the polarizer, wherein the polarizing plate protective film provides a polarizing plate which is an anti-glare film according to the above-described embodiments do.

Another embodiment of the present application is a thin film transistor, a curling filter provided on the thin film transistor, a liquid crystal cell provided on the color filter, provided on the liquid crystal cell, the polarizer and the at least one surface of the polarizer A display device comprising a polarizing plate including a protective film for a polarizing plate, wherein the anti-glare film according to the above-described embodiments is a protective film for the polarizer, or between a liquid crystal cell and a polarizing plate, or a surface facing the liquid crystal cell of the polarizing plate. It provides a display device which is provided on the opposite side of the.

When applying the anti-glare film according to the embodiments described herein to a display device including a liquid crystal panel having a COT structure, contrast of the display, external black blackness by adjusting the transmission spectrum by the anti-glare film , Viewing angle and the like can be improved. In particular, when the anti-glare film is provided on the opposite side of the surface facing the backlight of the liquid crystal panel, it is possible to more effectively improve the external black luminous effect and the contrast reduction problem due to the increased reflectivity inside the panel. Therefore, the anti-glare film according to the exemplary embodiments described herein is applicable to not only a general TFT-LCD panel but also a color filter on TFT (COT) panel, an OLED panel, and the like, and has more effective characteristics for improving black vision.

1 is a schematic view of a structure of a display device including a liquid crystal panel having a COT structure.

2 to 5 show an example of applying the anti-glare film to the display device according to some embodiments of the present application.

6 and 7 show a transmission spectrum and a reflection spectrum of the anti-glare film prepared in Comparative Example 1, respectively.

8 and 9 show transmission spectra and reflection spectra of the anti-glare film prepared in Comparative Example 2, respectively.

10 to 13 show reflection spectra of the anti-glare films prepared in Examples 1 to 4, respectively.

14 to 18 show transmission spectra of the films prepared in Comparative Example 3 and Examples 5 to 8, respectively.

19 shows measurement results of the black luminous improvement effect by the films prepared in Comparative Example 3 and Example 5.

EMBODIMENT OF THE INVENTION Hereinafter, invention is demonstrated in detail.

Anti-glare film according to an exemplary embodiment of the present application is characterized in that it has a minimum point of transmittance at 560 nm or more of the transmission spectrum between 500 nm and 800 nm. Such an anti-glare film absorbs light having a wavelength of 560 nm or more, and thus it is possible to adjust the reflection color appearing when an external light source is reflected by the panel. In particular, absorbing light of 560 nm or more may reduce the reflection color of the long wavelength, thereby improving the black visibility of the final panel. Here, black luminous means that the display looks black in the OFF state of the display.

The anti-glare film described above may be applied in various forms to various locations of the display device.

According to an exemplary embodiment of the present application, the anti-glare film comprises a transparent film and a coating layer provided on at least one side of the transparent film, the coating layer of transmittance at 560 nm or more of the transmission spectrum between 500 nm and 800 nm Has a minimum point. Here, the transparent film, the coating layer or a laminated structure thereof has an anti-glare function. In order to impart an anti-glare function, techniques known in the art may be used. For example, using a matrix resin and particles having different refractive indices to raise the internal haze of the coating layer, or to provide an antireflection function by using a non-flat structure of the surface of the coating layer, and to further introduce a low reflection layer or an antireflection layer on the layer. Can be.

According to another exemplary embodiment of the present application, the transparent film or the coating layer may further serve as a hard coating layer, an antireflection layer or a low reflection layer.

The transparent film means a film having a visible light transmittance of 60% or more, preferably 70% or more, more preferably 85% or more. As the transparent film, a film of various materials may be used as long as it does not adversely affect the optical properties of the display device. If necessary, if the anti-glare film intends to perform a specific function in the display device, a material capable of performing the specific function may be selected. For example, when the anti-glare film is a protective film for a polarizing plate, a polarizing plate protective film material known in the art can be used as a transparent film. For example, the transparent film is triacetyl cellulose (TAC), cycloolefin polymer (COP), cycloolefin copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PC), polyimide Films containing one or two or more resins such as (PI) can be used.

The coating layer may include a light absorbing agent that absorbs at least a portion of wavelengths selected from 560 nm to 800 nm to have a minimum point of transmittance at 560 nm or more in the transmission spectrum between 500 nm and 800 nm. Any light absorbing agent that absorbs the wavelength within the above range can be used without limitation.

According to one example, the light absorbing agent may have a maximum absorption wavelength in the range of 560 nm to 800 nm.

According to another example, the light absorbing agent may have a maximum absorption wavelength in the range of 560 nm to 750 nm.

According to another example, the light absorbing agent may have a maximum absorption wavelength in the range of 600 nm to 700 nm.

According to another example, a dye or a pigment capable of absorbing a near infrared (Near IR) region may be used as the light absorbing agent, and one kind or a mixture of two or more kinds may be used.

The content of the light absorbing agent may be determined according to the type of light absorbing agent and the optical properties according to other materials or structures of the coating layer. For example, the light absorbing agent may be used in an amount such that the absorption at the wavelength absorbed by the light absorbing agent is increased by at least 1% compared to before the light absorbing agent is added. In this case, it is advantageous to achieve the above-mentioned effect by adding the light absorber. In addition, the light absorbing agent is preferably included in an amount less than or equal to 60% or more of the transmittance of the coating layer. In this case, it is possible to prevent the decrease in optical properties required for the display device. In the present specification, unless stated otherwise, the transmittance means the transmittance of the film by D65 (standard illuminant). For example, it means the transmittance of the film by D65 (standard illuminant). For example, the transmittance can be measured using COH-400 (Nippon Denshoku, Inc.) and light source D65.

In some embodiments, the light absorbing agent may be included in an amount of 10 ppm to 5 wt% or less based on the coating layer.

The coating layer may further include a binder resin. As the binder resin, those known in the art may be used, and for example, (meth) acrylic resin may be used.

An additive may be added to the coating layer as necessary. For example, the coating layer may be a hard coating layer, an antireflection layer, an antiglare layer, or a low reflection layer, and in this case, an additive capable of providing a heart coating, an antireflection, an antiglare, or a low reflection may be added. The type and amount of the additive may be applied to a technique known in the art.

The anti-glare film according to another embodiment of the present application includes a transparent film and a light absorbing agent that absorbs at least a portion of wavelengths selected from 560 nm to 800 nm dispersed in the transparent film. Here, the transparent film has an anti-glare function. Here, the above description may be applied to the configuration related to the transparent film, the light absorbing agent, and the anti-glare function.

The light absorbing agent may be included in an amount such that the absorption at the wavelength absorbed by the light absorbing agent is increased by 1% or more compared to before the light absorbing agent is added, or by an amount such that the transmittance of the anti-glare film is 60% or more. For example, the light absorbing agent may be included in 10 ppm or more and 5% by weight or less with respect to the anti-glare film.

Anti-glare film according to another embodiment of the present application has a transmittance of 60% to 96% for the standard light source D65. When the transmittance of the standard light source D65 is less than 60%, the transmittance of the entire display may be lowered, which may cause a problem of deterioration of brightness, which is effective in improving the black vision described above which is 96% or less.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer absorbs at least a portion of wavelengths selected from 560 nm to 800 nm, or 560 An additional layer is provided between the transparent film and the coating layer that includes a light absorber that absorbs at least some wavelengths selected from nm to 800 nm. Here, the description regarding the transparent film and the light absorbing agent is as described above. In this embodiment, the anti-glare function may be expressed by the coating layer having the low refractive index.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer absorbs at least a portion of wavelengths selected from 560 nm to 800 nm, or 560 An additional layer comprising a light absorber absorbing at least a portion of wavelengths selected from nm to 800 nm is provided between the transparent film and the coating layer, wherein the transparent film may be a hard coat layer. Here, the description regarding the transparent film, the light absorbing agent and the anti-glare function is as described above. In the present exemplary embodiment, since the transparent film serves as a hard coating layer, weather resistance can be improved only by the anti-glare film.

According to another exemplary embodiment of the present application, the anti-glare film includes a transparent film and a coating layer provided on at least one side of the transparent film, and the coating layer includes a black or blackening material. Here, the transparent film, the coating layer or a laminated structure thereof has an anti-glare function.

The black or blackening material may be determined by a person skilled in the art in a range that does not adversely affect the physical properties, including the optical properties of the anti-glare film, and may vary depending on the type of the material or the components or film structure used with the material. . For example, the blacking or blackening material may be included in an amount of 10 ppm or more and 5% by weight or less with respect to the coating layer or the anti-glare film. If the coating layer is in a range such that the transmittance with respect to the standard light source D65 is 60% to 96%, the kind or content thereof is not limited.

According to another exemplary embodiment of the present application, the coating layer having a transmittance of 60% to 96% for the transparent film or the standard light source D65 may serve as a hard coating layer, an antireflection layer, or a low reflection layer.

As the black or blackening material, inorganic particles, organic particles and / or organic / inorganic hybrid particles may be used. For example, carbon black, vine black, lamp black, ivory black, titanium black, or the like may be used, but is not limited thereto.

The coating layer may further comprise a binder resin or additive if necessary. Description of the transparent film, the binder resin and the additive may be applied to the contents described in the above-described embodiments.

According to another exemplary embodiment of the present application, the coating layer having a transmittance of 60% to 96% with respect to the standard light source D65 is a hard coating layer, an antireflection layer, an antiglare layer, or a low reflection layer.

According to another exemplary embodiment of the present application, the anti-glare film includes a transparent film and a black or blackening material dispersed in the transparent film. In this case, the transparent film has an anti-glare function. The description of the transparent film, the black or blackening material, and the anti-glare function may be applied to the contents described in the above-described exemplary embodiments.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer includes a black or blackening material, or an additional layer including a black or blackening material. And between the coating layer. Here, the description regarding the transparent film and the light absorbing agent is as described above. In this embodiment, the anti-glare function may be expressed by the coating layer having the low refractive index.

According to yet an embodiment of the present application, the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer includes a black or blackening material, or an additional layer including a black or blackening material is the transparent film. It is provided between and the coating layer, the transparent film may be a hard coating layer. Here, the description regarding the transparent film, the light absorbing agent and the anti-glare function is as described above. In the present exemplary embodiment, since the transparent film serves as a hard coating layer, weather resistance can be improved only by the anti-glare film.

The anti-glare film according to the above-described embodiments may be a protective film for a polarizing plate, a retardation film, a brightness enhancement film, or a surface protection film.

Anti-glare films according to the above-described embodiments may be coated on a substrate, or may be manufactured using a method known in the art, such as a casting method. Such films may be attached directly to end-use products such as electronics, or using adhesives or adhesives. Including a substrate can be applied to the end use product with or without the substrate. However, the present invention is not limited thereto, and may be directly coated on components to be provided in an end use such as an electronic device. For example, the surface protection film is to protect the surface of the end-use products such as electronic devices, and may include a low reflection film or an anti-glare film, which may be formed by coating directly on the surface of the electronic product.

Another embodiment of the present application includes a polarizer, and a polarizing plate protective film provided on at least one surface of the polarizer, the polarizing plate protective film provides a polarizing plate which is an anti-glare film according to the above-described embodiments. The structure of the polarizing plate is illustrated in FIG. 2. According to Figure 2, the structure is provided with a protective film for the polarizer on both sides of the polarizer, it is not limited to this may be provided with a protective film for the polarizer on only one side. If necessary, one of the protective film for the polarizer may be replaced with a retardation film. When the polarizing plate protective film is provided on both sides of the polarizer as shown in Figure 2, any one or both of them may be an anti-glare film according to the above-described embodiments.

According to one example, the polarizing plate protective film provided on the side of the surface opposite to the liquid crystal cell of the polarizer may be an anti-glare film according to the above-described embodiments.

The polarizing plate protective film may have a configuration including a transparent film and a coating layer as described above, or may have a configuration including a light absorber dispersed in the transparent film and the transparent film.

When the protective film for polarizing plate has a configuration including a transparent film and a coating layer, the coating layer is preferably provided on the opposite side of the surface facing the polarizer of the protective film for polarizing plate. 3 illustrates the structure of a protective film for polarizing plates including a transparent film and a coating layer. 3 illustrates only one structure of the polarizer protective film, but the present invention is not limited thereto, and two polarizer protective films may be an anti-glare film according to the above-described embodiments.

Another embodiment of the present application is a thin film transistor, a curling filter provided on the thin film transistor, a liquid crystal cell provided on the color filter, provided on the liquid crystal cell, the polarizer and the at least one surface of the polarizer A display device comprising a polarizing plate including a protective film for a polarizing plate, wherein the anti-glare film according to the above-described embodiments is a protective film for the polarizer, or between a liquid crystal cell and a polarizing plate, or a surface facing the liquid crystal cell of the polarizing plate. It provides a display device which is provided on the opposite side of the.

The display device may further include a backlight unit on the thin film transistor side. 1 illustrates a display device having a liquid crystal panel having a COT structure including a backlight unit.

The liquid crystal cell may have a material and structure known in the art, and for example, two substrates, a liquid crystal material filled between two substrates, a spacer provided between the two substrates, and a seal for sealing the liquid crystal material. And the like.

According to one example, the anti-glare film is the protective film for the polarizer, the protective film for the polarizer is provided on the opposite side of the surface facing the liquid crystal cell of the polarizer. 3 illustrates such a structure. However, the present invention is not limited thereto, and all of the polarizer protective films provided on both sides of the polarizer may be anti-glare films according to the above-described embodiment.

According to another example, the anti-glare film comprises a coating layer provided on the opposite side of the transparent film and the surface opposite to the polarizer of the transparent film, the coating layer is 560 nm of transmission spectrum between 500 nm and 800 nm In the above, it has a minimum point of transmittance, or the transmittance | permeability with respect to the standard light source D65 is 60%-96%. Description of the coating layer having such a feature is as described above.

According to one example, the anti-glare film, as shown in Figure 4 may be provided on the side opposite to the surface of the polarizing plate facing the liquid crystal cell, as shown in Figure 5 may be provided between the liquid crystal cell and the polarizing plate. If necessary, two or more anti-glare films according to the above-described embodiments may be applied to the display device. For example, the anti-glare film may be provided between the liquid crystal cell and the polarizing plate, or on the opposite side of the surface of the polarizing plate facing the liquid crystal cell, or both. In addition, the anti-glare film is used in the protective film for the polarizing plate, and may be provided between the liquid crystal cell and the polarizing plate, or on the opposite side of the surface of the polarizing plate facing the liquid crystal cell.

According to another exemplary embodiment of the present application, in the display apparatus according to the aforementioned exemplary embodiment, an optical film for adjusting the contrast ratio in the ON state of the display apparatus may be further provided between the backlight unit and the thin film transistor. The addition of the above-mentioned light absorbing agent or black or blackening material is effective to improve black vision with the display turned off. However, although not necessarily, it may affect the brightness in the state where the display is WHITE. Therefore, by arranging the optical film for adjusting the contrast ratio in the ON state of the display device between the backlight unit and the thin film transistor, it is possible to prevent the above problem that may occur. The optical film for adjusting the contrast ratio in the ON state of the display device may affect the contrast ratio by a film forming material, an additive, a surface treatment, or a coating layer formation. For example, the contrast ratio may be adjusted within a specific range in a state where the display device is turned on by the contrast ratio adjusting optical film.

According to another exemplary embodiment of the present application, in the display device according to the aforementioned exemplary embodiment, an additional polarizing plate may be provided on an opposite surface of the thin film transistor opposite to the color filter. This additional polarizing plate may comprise a polarizer and a protective film for polarizing plate provided on at least one side of the polarizer.

For example, the anti-glare film for adjusting the contrast ratio in the ON state of the display device provided between the backlight unit and the thin film transistor may be a protective film for the polarizing plate.

According to yet an embodiment of the present application, the transparent conductive film is further provided on at least a portion of the surface of the electrode included in the thin film transistor facing the color filter. The transparent conductive film may be an ITO film. In the display device using the liquid crystal panel of the COT structure, the internal reflection by the electrode of the thin film transistor can be effectively reduced by the transparent conductive film. The transparent conductive film may be one layer or two or more layers.

The composition for forming a transparent film or coating layer of the anti-glare film according to the above-described embodiments may further include a binder resin or a polymerizable compound and a solvent for forming the binder resin. As an example, the composition for forming a transparent film or coating layer of the anti-glare film may include a polyfunctional (meth) acrylate, a photoinitiator and a solvent. However, not only polyfunctional (meth) acrylates but also those known in the art may be used as the binder resin or the polymerizable compound for forming the binder resin.

The composition for forming a transparent film or coating layer of the anti-glare film may be a hard coating layer, an anti-reflection layer, an anti-glare layer, or a composition for coating a low reflection layer. In this case, the composition for forming a transparent film or coating layer of the anti-glare film may further include an additive for imparting a hard coating layer, an anti-reflection layer, an anti-glare layer, or a low reflection layer.

The hard coating layer may include a binder resin such as a polyfunctional (meth) acrylate, an antistatic agent, a photoinitiator, and a solvent as a coating layer for hardness, scratch resistance, and / or antistatic to protect the polarizer, and It may further include an additive according.

The antireflective layer is for antireflection, and may include, for example, a binder resin such as polyfunctional (meth) acrylate, low refractive particles such as hollow silica or nanosilica, or a low refractive material such as a low refractive binder, a photoinitiator and a solvent. And, if necessary, may further include an additive.

The anti-glare layer is for preventing glare, and may include, for example, a binder resin such as polyfunctional (meth) acrylate, particles such as inorganic particles or organic particles, a photoinitiator and a solvent, and may further include an additive as necessary. have.

Hereinafter, the above-described exemplary embodiments will be described in more detail with reference to the following embodiments. However, the following examples are merely for illustrative purposes, and are not intended to limit the scope of the present invention.

Comparative Example 1

The anti-glare hard coating (SG: Semi Glare) composition was coated on a triacetyl cellulose (TAC) film with 10 meyer bars, and then dried in a 60 ° C. oven for 2 minutes and irradiated with ultraviolet rays of 80 mJ / cm ² to prevent anti-glare coatings. A coating layer having characteristics was formed. The anti-glare hard coating composition contained 30 wt% of a binder resin such as polyfunctional (meth) acrylate, 2.5 wt% of particles such as inorganic particles or organic particles, 2 wt% of photoinitiator, 0.5 wt% of additive, and 65 wt% of solvent. The transmission spectrum of the anti-glare film prepared as described above is shown in FIG. 6.

The transmission spectrum was measured using a UV-VIS-NIR Spectrophotometer (Solidspec-3700, Shimadzu Co., Ltd.), a transmission / reflectance measuring device for each wavelength.

In addition, the prepared optical film is mounted as a protective film of the polarizing plate provided on the opposite side of the surface of the COT panel facing the color filter of the liquid crystal cell, and the result of measuring the reflection spectrum for black vision measurement is shown in FIG. It was. Reflectance spectra were measured using a spectrophotometer (CM-2600d, Konica Minolta) which is a transmission / reflectance measuring instrument for each wavelength.

Comparative Example 2

Anti-glare low reflection coating on triacetyl cellulose (TAC) film (SG-LR:

Semi Glare-Low Reflection) was formed. The low reflection coating composition having a lower refractive index than the anti-glare low reflection coating layer was coated on the meyer bar 4 on the anti-glare hard coating layer of Comparative Example 1, and then dried in a 60 ° C. oven for 2 minutes and irradiated with 80 mJ / cm ² ultraviolet rays. A coating layer was formed having anti-glare low reflection coating properties.

The low reflection coating composition is based on the solid content of 45% binder resin, such as polyfunctional (meth) acrylate, 35% by weight hollow silica particles, 10% by weight nano silica, 5% by weight of a bolso-based additive, 3% by weight photoinitiator, 2% by weight of additives were added and the solvent was added to dilute to 3% by weight of solids in the total composition.

With respect to the film prepared in Comparative Example 2, the transmission spectrum and the reflection spectrum were measured in the same manner as in Comparative Example 1 and shown in FIGS. 8 and 9, respectively.

Example 1

In the same manner as in Comparative Example 1, except that black pigment (Titanium Black) was added to the anti-glare hard coating composition of Comparative Example 1, based on the solid content of the dye relative to the solid content of the coating layer composition. Films were prepared and the transmission spectra were measured.

In addition, the protective film of the polarizing plate was mounted in the same manner as in Comparative Example 1, and the result of measuring the reflectance spectrum for black vision measurement is shown in FIG.

Example 2

In forming the anti-glare low reflection coating layer of Comparative Example 2, except that black pigment (Titanium Black) is added to the anti-glare hard coating composition, based on the solid content of the dye relative to the solid content of the coating layer composition, 1 wt% A film was prepared in the same manner as in Comparative Example 2 and the transmission spectrum was measured. In addition, the protective film of the polarizing plate was mounted in the same manner as in Comparative Example 2, and the results of measuring the reflection spectrum for black vision measurement are shown in FIG.

Example 3

In forming the anti-glare low reflection coating layer of Comparative Example 2, except that 1.5 weight% of black pigment (Titanium Black) is added to the anti-glare hard coating composition, based on the solid content of the dye to the solid content of the coating layer composition A film was prepared in the same manner as in Comparative Example 2 and the transmission spectrum was measured. In addition, it was mounted in the protective film of the polarizing plate in the same manner as in Comparative Example 2, and the result of measuring the reflection spectrum for black vision measurement is shown in FIG.

Example 4

In forming the anti-glare low reflection coating layer of Comparative Example 2, except that black pigment (Titanium Black) is added to the anti-glare hard coating composition, based on the solid content of the dye relative to the solid content of the coating layer composition, 2% by weight A film was prepared in the same manner as in Comparative Example 2 and the transmission spectrum was measured. In addition, the protective film of the polarizing plate was mounted in the same manner as in Comparative Example 2, and the result of measuring the reflection spectrum for black vision measurement is shown in FIG.

Compared with the anti-glare film of Comparative Example 1 (FIG. 7), when the anti-glare film of Example 1 was used (FIG. 10), the reflectance was reduced in the radio wave field, and the decrease in reflectance between 500 nm and 740 nm was observed. appear. In addition, when using the film of Example 2 (FIG. 11), the reflectance decreased in the electric field compared with the case of using the film of Comparative Example 2 (FIG. 9). This absorbs yellow light reflected by external light, resulting in improved black visibility. In particular, in the Example, the effect of reducing the panel reflectance was more excellent by forming the low reflection coating layer.

In addition, when the optical films of Examples 2, 3, and 4 were used (FIGS. 11, 12, and 13), as the black pigment content was increased, the absorption of yellow light reflected by external light was increased and black visual acuity was slightly increased. The results show further improvement. In particular, the decrease in reflectance between 500 nm and 740 nm in Examples 2, 3, and 4 was more pronounced than in Comparative Example 1.

Comparative Example 3

The anti-glare coating (SGLR: Semi Glare-Low Reflection) composition was coated on a triacetyl cellulose (TAC) film with 10 meyer bars, and then dried in a 60 ° C. oven for 2 minutes and irradiated with ultraviolet rays of 80 mJ / cm ² . A coating layer was formed having anti-coat properties. The anti-glare coating composition contained 30 wt% of a binder resin such as polyfunctional (meth) acrylate, 2.5 wt% of particles such as inorganic particles or organic particles, 2 wt% of photoinitiator, 0.5 wt% of additive, and 65 wt% of solvent. The transmission spectrum of the optical film manufactured as described above is shown in FIG. 14.

The transmission spectrum was measured using a UV-VIS-NIR Spectrophotometer (Solidspec-3700, Shimadzu Co., Ltd.), a transmission / reflectance measuring device for each wavelength.

Example 5

A blue pigment (GJ1226) was added to the anti-glare coating composition, except that 500 ppm, 1,000 ppm, and 3,000 ppm, respectively, were added based on the solids content of the dye to the solids content of the coating layer composition. Was prepared and the transmission spectrum was measured. The transmission spectrum of the optical film manufactured as described above is shown in FIG. 15.

Example 5 (Blue pigment, GJ1226, 1,000ppm) and the optical film prepared in Comparative Example 3 was mounted with a protective film of a polarizing plate provided on the opposite side of the surface of the COT panel structure facing the color filter of the liquid crystal cell, respectively, The black luminous improvement effect was measured. The results are shown in FIG. 19. Compared to the case of using the optical film of Comparative Example 3 (A-35), when using the optical film of Example 5 (A-27) the reflectance was reduced in the radio wave field, especially the decrease in reflectance between 500nm to 740nm Noticeably. This absorbs yellow light reflected by external light, resulting in improved black visibility.

Example 6

Neptun blue 755 was added to the anti-glare coating composition, except that 1,000 ppm and 3,000 ppm, respectively, were added based on the solids content of the dye to the solids content of the coating layer composition. Was measured. The transmission spectrum of the optical film manufactured as described above is shown in FIG. 16.

Example 7

A film was prepared in the same manner as in Comparative Example 3, except that Basic blue 7 was added to the anti-glare coating composition and 1,000 ppm and 3,000 ppm, respectively, were added based on the solid content of the dye to the solid content of the coating layer composition. Was measured. The transmission spectrum of the optical film manufactured as described above is shown in FIG. 17.

Example 8

The film was prepared in the same manner as in Comparative Example 3 except that Orasol blue 855 was added to the anti-glare coating composition, based on the solid content of the dye relative to the solid content of the coating layer composition, and the transmission spectrum was measured. The transmission spectrum of the optical film manufactured as described above is shown in FIG. 18.

Claims (23)

An anti-glare film having a minimum point of transmission at 560 nm or more in the transmission spectrum between 500 nm and 800 nm. The anti-glare film of claim 1, wherein the anti-glare film includes a transparent film and a coating layer provided on at least one surface of the transparent film, and the coating layer includes a light absorbing agent absorbing at least a portion of wavelengths selected from 560 nm to 800 nm. Anti-glare film. The method according to claim 2, wherein the light absorbing agent is included in an amount such that the absorption at the wavelength absorbed by the light absorbing agent is increased by 1% or more compared to before adding the light absorbing agent, the amount of the transmittance of the coating layer to 60% or more. Anti-glare film. The anti-glare film of claim 2, wherein the light absorbing agent is included in an amount of 10 ppm or more and 5% by weight or less based on the coating layer. The anti-glare film of claim 2, wherein the transparent film or the coating layer is a hard coating layer, an antireflection layer, or a low reflection layer. The anti-glare film of claim 1, wherein the anti-glare film comprises a light absorbing agent absorbing at least a portion of a wavelength selected from a transparent film and 560 nm to 800 nm dispersed in the transparent film. The method according to claim 6, wherein the light absorbing agent to an amount such that the absorption at the wavelength absorbed by the light absorbing agent is increased by at least 1% compared to before adding the light absorbing agent, and less than an amount such that the transmittance of the anti-glare film is at least 60%. Anti-glare film to be included. The anti-glare film of claim 6, wherein the light absorbing agent is included in an amount of 10 ppm or more and 5% by weight or less with respect to the anti-glare film. The method according to claim 1, wherein the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer absorbs at least a portion of wavelengths selected from 560 nm to 800 nm, or 560 and an additional layer comprising a light absorber absorbing at least a portion of the wavelengths selected from nm to 800 nm is provided between the transparent film and the coating layer. The method according to claim 1, wherein the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer absorbs at least a portion of wavelengths selected from 560 nm to 800 nm, or 560 An additional anti-glare film is provided between the transparent film and the coating layer, wherein the additional layer comprising a light absorber absorbing at least a portion of wavelengths selected from nm to 800 nm, wherein the transparent film is a hard coat layer. Anti-glare film having a transmittance of 60% to 96% for standard light source D65. The anti-glare film of claim 11, wherein the anti-glare film includes a transparent film and a coating layer provided on at least one surface of the transparent film, and the coating layer includes a black or blackening material. The anti-glare film of claim 11, wherein the anti-glare film comprises a transparent film and a black or blackening material dispersed in the transparent film. The method according to claim 11, wherein the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer includes a black or blackening material, or an additional layer including a black or blackening material. Anti-glare film is provided between the coating layer. The method according to claim 11, wherein the anti-glare film is a transparent film; And a coating layer provided on the transparent film and having a lower refractive index than the transparent film, wherein the transparent film or the coating layer includes a black or blackening material, or an additional layer including a black or blackening material is the transparent film. And provided between the coating layer, the anti-glare film is the transparent film is a hard coating layer. The anti-glare film according to any one of claims 1 to 15, wherein the anti-glare film is a protective film for a polarizing plate, a retardation film, a brightness enhancement film, or a surface protection film. Polarizer, and a polarizing plate comprising a protective film for polarizing plate provided on at least one surface of the polarizer, wherein the polarizing plate protective film is a polarizing plate according to any one of claims 1 to 15. A polarizing plate including a thin film transistor, a curling filter provided on the thin film transistor, a liquid crystal cell provided on the color filter, a liquid crystal cell provided on the liquid crystal cell, and a polarizer and a protective film for a polarizing plate provided on at least one surface of the polarizer. A display device comprising: an anti-glare film according to any one of claims 1 to 15 is provided as a protective film for the polarizer, or between a liquid crystal cell and a polarizing plate, or on an opposite side of the surface of the polarizing plate opposite to the liquid crystal cell. Display device. The display device according to claim 18, wherein the anti-glare film is the protective film for the polarizer, and the protective film for the polarizer is provided on the opposite side of the surface facing the liquid crystal cell of the polarizer. The display apparatus of claim 19, wherein the anti-glare film comprises a coating layer provided on a surface opposite to a surface of the transparent film and the polarizer of the transparent film. The display apparatus of claim 18, wherein the display apparatus further comprises a backlight unit provided on a side opposite to a surface of the thin film transistor that faces the color filter, and the contrast in the ON state of the display apparatus provided between the backlight unit and the thin film transistor. Display device further comprising a non-adjustable optical film. The display apparatus according to claim 18, further comprising one or two or more transparent conductive films provided on at least some of the surfaces of the electrodes included in the thin film transistors that face the color filters. The display device of claim 21, wherein the transparent conductive film is an ITO layer.

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