KR20160094343A - Semi glare film and polaring plate and display apparatus comprising the same - Google Patents

Abstract

The present invention relates to a glare preventing film having a minimum point of permeability at least 560 nm within 500-800 nm of a permeable spectrum; a glare preventing film having 60-96% of permeability with respect to a standard light source D65; a polarizing plate having the glare preventing film; and the display device having the glare preventing film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an anti-glare film, a polarizing plate 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 Korean 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 by reference.

2. Description of the Related Art Recently, display devices have been developed to have various functions in addition to TVs, computers, touch panels, large screens, and portable applications. Accordingly, attempts have been made to change or improve the structure of the display device, to improve the performance of components such as an optical film, or to use additional components such as a functional optical film to provide various functions of the display device.

A liquid crystal panel of a 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. FIG. 1 illustrates the stacking sequence of each structure in an apparatus having a COT structure. 1, a liquid crystal panel having a structure in which a thin film transistor, a color filter and a liquid crystal cell are sequentially stacked, and a polarizing plate provided on both sides thereof are provided.

The present inventors have found that when the liquid crystal panel of the COT structure is used, the reflectivity inside the panel is increased due to the metal contained in the electrodes or the like, and the optical characteristics of the display such as external blackness and contrast are lowered.

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

According to another 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, wherein the coating layer has a transmittance of 560 nm or more in a transmittance spectrum between 500 nm and 800 nm And has a minimum point of permeability. For example, the coating layer comprises a light absorber that absorbs at least some of the wavelengths selected from 560 nm to 800 nm. Here, the transparent film, the coating layer, or the laminated structure thereof has an anti-glare function.

According to another 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 embodiment of the present application, the anti-glare film comprises a transparent film and a light absorbent absorbing at least a part of the wavelengths selected from 560 nm to 800 nm dispersed in the transparent film. Here, the transparent film has an anti-glare function.

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer absorbs at least a part of the wavelength selected from 560 nm to 800 nm, an additional layer comprising a light absorbing material that absorbs at least a portion of the wavelength selected from nm to 800 nm is provided between the transparent film and the coating layer.

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer absorbs at least a part of the wavelength selected from 560 nm to 800 nm, and a light absorber that absorbs at least a part of the wavelength selected from the range of from 1 nm to 800 nm is provided between the transparent film and the coating layer, and the transparent film may be a hard coating layer.

Another embodiment of the present application provides an antiglare film having a transmittance of 60% to 96% with respect to the standard light source D65.

According to another 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 has a transmittance of 60% to 96% with respect to the standard light source D65. To this end, the coating layer may comprise a black or blackening material. A black substance means that it has a black color itself, and a blackening substance means a substance that can lower the transmittance due to absorption of light even if it is not black. Here, the transparent film, the coating layer, or the laminated structure thereof has an anti-glare function.

According to another embodiment of the present application, the coating layer having a transmittance of 60% to 96% with respect to 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 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 another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer comprises a black or blackening material, or a further layer comprising a black or blackening material, And the coating layer.

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer comprises a black or blackening material, or a further layer comprising a black or blackening material, And the coating layer, and the transparent film may be a hard coating layer.

According to another embodiment of the present application, the anti-glare film according to the above-described embodiments is a protective film for a polarizing plate, a retardation film, a luminance enhancement film, or a surface protective film.

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

Another embodiment of the present application is a liquid crystal display device comprising a thin film transistor, a curl 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, An anti-glare film according to the above-described embodiments may be used as the protective film for the polarizer, or between the liquid crystal cell and the polarizer, or on the side of the polarizer facing the liquid crystal cell Is provided on the opposite surface side of the display panel.

When the anti-glare film according to the embodiments described herein is applied to a display device including a liquid crystal panel having a COT structure, the anti-glare film controls the contrast of the display, the external blackness, , The viewing angle and the like can be improved. In particular, when the anti-glare film is provided on the opposite surface side of the liquid crystal panel facing the backlight, it is possible to further effectively solve the problem of external black tint and contrast reduction due to an increase in the reflectance inside the panel. Accordingly, the anti-glare film according to the embodiments described herein can be applied not only to a general TFT-LCD panel but also to a color filter on TFT (COT) panel, an OLED panel, and the like.

1 is a structural schematic diagram of a display device including a liquid crystal panel of a COT structure.
FIGS. 2 to 5 show an example in which an antiglare film according to some embodiments of the present application is applied to a display device.
6 and 7 show transmission spectra and reflection spectra of the anti-glare film prepared in Comparative Example 1, respectively.
8 and 9 show transmission spectra and reflection spectra of the antiglare films prepared in Comparative Example 2, respectively.
FIGS. 10 to 13 show the reflection spectra of the antiglare films prepared in Examples 1 to 4, respectively.
14 to 18 show the transmission spectra of the films prepared in Comparative Examples 3 and 5 to 8, respectively.
FIG. 19 shows the measurement results of the black sensation improving effect by the films prepared in Comparative Examples 3 and 5.

Hereinafter, the present invention will be described in detail.

The anti-glare film according to one embodiment of the present application is characterized by having the minimum point of transmittance at 560 nm or more in 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 it is possible to control the reflection color tone which appears when an external light source is reflected by the panel. Particularly, when light having a wavelength of 560 nm or more is absorbed, the reflection color of the long wavelength is reduced, and the black feeling of the final panel can be improved. Here, the black visual sense means that the display looks black in the OFF state of the display.

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

According to one 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, wherein the coating layer has a transmittance of 560 nm or more in a transmission spectrum between 500 nm and 800 nm It has a minimum point. Here, the transparent film, the coating layer, or the laminated structure thereof has an anti-glare function. In order to impart anti-glare function, techniques known in the art can be used. For example, it is possible to increase the haze inside the coating layer by using a matrix resin and particles having different refractive indexes, to impart an antireflection function by using a non-flat structure on the surface of the coating layer, and to additionally introduce a low- .

According to another 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 can be used so long as it does not adversely affect the optical properties of the display device. If necessary, if the anti-glare film is intended to perform a specific function in the display device, a material capable of performing the specific function can be selected. For example, when the anti-glare film is a protective film for a polarizing plate, a protective film material for a polarizing plate known in the art can be used as the transparent film. For example, the transparent film may be formed of at least one of triacetylcellulose (TAC), cycloolefin polymer (COP), cycloolefin copolymer (COC), polyethylene terephthalate (PET), polypropylene (PP), polycarbonate (PI), may be used.

The coating layer may comprise a light absorber that absorbs at least some of the wavelengths selected from 560 nm to 800 nm to have a configuration having a minimum point of transmittance at 560 nm or more in the transmission spectrum between 500 nm and 800 nm. Any light absorber 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 within a range of 600 nm to 700 nm.

According to another example, as the light absorber, a dye or a pigment capable of absorbing a near IR region may be used, and one or a mixture of two or more thereof may be used.

The content of the light absorbent may be determined depending on the kind of the light absorbent and the optical properties depending on other materials and structures of the coating layer. For example, the light absorbing agent can be used in an amount such that the absorption at a wavelength absorbed by the light absorbing agent is increased by 1% or more as compared with that before the light absorbing agent is added. In this case, it is advantageous to achieve the above-mentioned effect by adding the light absorbent. The light absorbing agent is preferably contained in an amount such that the transmittance of the coating layer is 60% or more. In this case, it is possible to prevent a decrease in optical properties required for the display device. In this specification, unless otherwise stated, the transmittance refers to the transmittance of the film by D65 (standard illuminant). For example, the transmittance of the film by D65 (standard illuminant). For example, the transmittance can be measured using COH-400 (Nippon Denshoku) and a light source D65.

According to one example, the light absorbing agent may be contained in an amount of 10 ppm to 5 wt% or less with respect to 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, a (meth) acrylic resin may be used.

Additives may be added to the coating layer as required. For example, the coating layer may be a hard coating layer, an antireflection layer, an antiglare layer, or a low reflection layer, in which an additive capable of imparting a heart coating, antireflection, anti-glare or low reflection may be added. The kind and amount of the additive to be added may be those known in the art.

An antiglare film according to another embodiment of the present application includes a transparent film and a light absorbing agent that absorbs at least a part of the wavelength selected from 560 nm to 800 nm dispersed in the transparent film. Here, the transparent film has an anti-glare function. Here, the above-described description can be applied to the structure relating to the transparent film, the light absorbent, and the anti-glare function.

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

The antiglare film according to another embodiment of the present application has a transmittance of 60% to 96% with respect to the standard light source D65. If the transmittance to the standard light source D65 is less than 60%, the transmittance of the entire display may be lowered and the brightness may deteriorate, which is effective to improve the above-mentioned black visual feeling of 96% or less.

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer absorbs at least a part of the wavelength selected from 560 nm to 800 nm, an additional layer comprising a light absorbing material that absorbs at least a portion of the wavelength selected from nm to 800 nm is provided between the transparent film and the coating layer. The description of the transparent film and the light absorbent is as described above. In this embodiment, the anti-glare function can be exhibited by the coating layer having a low refractive index.

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer absorbs at least a part of the wavelength selected from 560 nm to 800 nm, and a light absorber that absorbs at least a part of the wavelength selected from the range of from 1 nm to 800 nm is provided between the transparent film and the coating layer, and the transparent film may be a hard coating layer. Here, the description of the transparent film, the light absorbent and the anti-glare function is as described above. In this embodiment, since the transparent film serves as a hard coating layer, the weather resistance can be improved only by the anti-glare film.

According to another 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 the laminated structure thereof has an anti-glare function.

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

According to another embodiment of the present application, the coating layer having a transmittance of 60% to 96% with respect to 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 hybrid particles may be used. For example, carbon black, vine black, lamp black, ivory black, titanium black, and the like may be used, but the present invention is not limited thereto.

The coating layer may further include a binder resin and, if necessary, an additive. As for the transparent film, the binder resin and the additive, the contents described in the above-described embodiments can be applied.

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

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer comprises a black or blackening material, or a further layer comprising a black or blackening material, And the coating layer. The description of the transparent film and the light absorbent is as described above. In this embodiment, the anti-glare function can be exhibited by the coating layer having a low refractive index.

According to another embodiment of the present application, the anti-glare film comprises a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer comprises a black or blackening material, or a further layer comprising a black or blackening material, And the coating layer, and the transparent film may be a hard coating layer. Here, the description of the transparent film, the light absorbent and the anti-glare function is as described above. In this embodiment, since the transparent film serves as a hard coating layer, the 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 luminance enhancement film, or a surface protective film.

The anti-glare films according to the above-described embodiments may be coated on a substrate, or may be manufactured using methods known in the art such as a casting method. Such a film may be applied directly to an end use product such as an electronic device or by using a pressure-sensitive adhesive or an adhesive. It may be applied to the end use product with or without the substrate if it includes the substrate. However, it is not limited thereto, and it can be coated directly on an end-use part, for example, a part to be provided in an electronic device. For example, the surface protective film is intended to protect the surface of an end use product such as an electronic device, and may include a low reflection film or an anti-glare film, which can be formed by coating directly on the surface of an electronic product.

Another embodiment of the present application provides a polarizing plate comprising a polarizer and a protective film for a polarizing plate provided on at least one side of the polarizer, wherein the protective film for polarizing plate is an anti-glare film according to the above-described embodiments. Fig. 2 illustrates the structure of the polarizing plate. Referring to FIG. 2, a polarizer protective film is provided on both sides of the polarizer. However, the polarizer protective film may be provided on only one side of the polarizer. If necessary, one of the protective films for the polarizer may be replaced with a retardation film. When a polarizing plate protective film is provided on both sides of the polarizer as shown in FIG. 2, either or both of them may be an anti-glare film according to the above-described embodiments.

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

The protective film for a polarizing plate may have a structure including a transparent film and a coating layer as described above, and may have a structure including a transparent film and a light absorbent dispersed in the transparent film.

When the protective film for a polarizing plate has a structure including a transparent film and a coating layer, the coating layer is preferably provided on the opposite side of the protective film for the polarizing plate opposite to the polarizer. Fig. 3 illustrates the structure of a protective film for a polarizing plate including a transparent film and a coating layer. Although only one structure of the polarizer protective film is illustrated in FIG. 3, the protective film for two polarizers may be an anti-glare film according to the above-described embodiments.

Another embodiment of the present application is a liquid crystal display device comprising a thin film transistor, a curl 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, An anti-glare film according to the above-described embodiments may be used as the protective film for the polarizer, or between the liquid crystal cell and the polarizer, or on the side of the polarizer facing the liquid crystal cell Is provided on the opposite surface side of the display panel.

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

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

According to one example, 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 of the polarizer facing the liquid crystal cell. Such a structure is illustrated in Fig. However, the present invention is not limited thereto, and all of the protective films for polarizers provided on both sides of the polarizer may be the anti-glare film according to the above-described embodiment.

According to another example, the anti-glare film may include a transparent film and a coating layer provided on a side opposite to the polarizer side of the transparent film, wherein the coating layer has a transmittance of 560 nm Or a transmittance of 60% to 96% with respect to the standard light source D65. The description of the coating layer having such characteristics is as described above.

According to one example, the anti-glare film may be provided on the opposite side of the polarizing plate facing the liquid crystal cell as shown in FIG. 4, or may be provided between the liquid crystal cell and the polarizing plate as shown in FIG. If necessary, the anti-glare film according to the above-described embodiments may be applied to two or more display devices. For example, the anti-glare film may be provided on both sides of the liquid crystal cell and the polarizing plate, or on the opposite side of the polarizing plate facing the liquid crystal cell, or both. The anti-glare film may be used for a protective film for a polarizing plate, and may be provided between the liquid crystal cell and the polarizing plate, or on the opposite side of the polarizing plate facing the liquid crystal cell.

According to another embodiment of the present application, in the display device according to the above-described embodiment, the contrast ratio adjusting optical film in the ON state of the display device can be additionally provided between the backlight unit and the thin film transistor. The addition of the above-described light absorber or black or blackening material is effective in improving the blackness in the state where the display is OFF. However, though not necessarily, it may affect the brightness in the WHITE state of the display. Therefore, by disposing the optical film for contrast ratio adjustment in the ON state of the display device between the backlight unit and the thin film transistor, it is possible to prevent the above-described problems that may arise. The contrast ratio adjusting optical film in the ON state of the display device may affect the contrast ratio by a film forming material, an additive, a surface treatment, a coating layer formation, or the like. For example, the contrast ratio can be adjusted within a specific range when the display device is turned ON by the contrast ratio adjusting optical film.

According to another embodiment of the present application, in the display device according to the above-described embodiment, an additional polarizing plate may be provided on the opposite side of the surface of the thin film transistor facing the color filter. The additional polarizing plate may include a polarizer and a protective film for a polarizing plate provided on at least one side of the polarizer.

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

According to another embodiment of the present application, a transparent conductive film is additionally provided on at least a part 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 due to the electrodes of the thin film transistor can be effectively reduced by the transparent conductive film formation. The transparent conductive film may be one layer or two or more layers.

The transparent film or the composition for forming a coating layer of the anti-glare film according to the above-described embodiments may further comprise a polymerizable compound and a solvent for forming a binder resin or a binder resin. In one example, the transparent film or the composition for forming the coating layer of the anti-glare film may include a polyfunctional (meth) acrylate, a photoinitiator and a solvent. However, as the polymerizable compound for forming the binder resin or the binder resin, multifunctional (meth) acrylate, as well as those known in the art, may be used.

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

The hard coat 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 strengthening and / or antistatic for polarizer protection, May further comprise additives.

The antireflection layer is intended to prevent reflection, and may include, for example, a binder resin such as polyfunctional (meth) acrylate, a low refractive material such as low refractive particles such as hollow silica or nanosilica or a low refractive binder, a photoinitiator and a solvent And may further contain additives as required.

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, have.

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

Comparative Example  One

Triacetyl cellulose (TAC) prevent glare on the film hard coating (SG: Semi Glare) after coating the composition as meyer bar 10 times for 2 minutes a dry, antiglare by irradiation of ultraviolet light of 80mJ / cm ² coating at 60 ℃ oven A coating layer having properties was formed. The anti-glare hard coat 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 a photoinitiator, 0.5 wt% of an additive, and 65 wt% of a solvent. The measurement result of the transmission spectrum of the anti-glare film thus prepared is shown in FIG.

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

The manufactured optical film was mounted as a protective film of a polarizing plate provided on the opposite side of the surface of the liquid crystal cell facing the color filter in the COT panel structure and the reflection spectrum was measured for the black visibility measurement, . The reflection spectrum was measured using a spectrophotometer (CM-2600d, Konica Minolta), which is a transmission / reflectance measurement apparatus for each wavelength.

Comparative Example  2

On the triacetyl cellulose (TAC) film, an anti-glare anti-reflective coating (SG-LR:

Semi Glare-Low Reflection). A low reflection coating composition having a lower refractive index than the anti-glare low reflection coating layer was coated on the anti-glare hard coating layer of Comparative Example 1 with meyer bar No. 4, dried in an oven at 60 ° C for 2 minutes, irradiated with ultraviolet rays of 80 mJ / cm ² A coating layer having anti-glare low reflection coating properties was formed.

The low reflection coating composition comprises 45 wt% of a binder resin such as polyfunctional (meth) acrylate, 35 wt% of hollow silica particles, 10 wt% of nano silica, 5 wt% of a boron based additive, 3 wt% of a photoinitiator, 2% by weight of an additive, and a solvent was added to dilute the whole composition so as to have a solid content of 3% by weight.

Transmission spectra and reflection spectra of the films prepared in Comparative Example 2 were measured in the same manner as in Comparative Example 1 and shown in Figs. 8 and 9, respectively.

Example  One

A black pigment (Titanium Black) was added to the antiglare hard coat composition of Comparative Example 1 in the same manner as in Comparative Example 1, except that 0.5% by weight of the black pigment (Titanium Black) was added to the solid content of the coating layer composition based on the solid content of the dye A film was prepared and the transmission spectrum was measured.

In addition, a protective film of a polarizing plate was attached in the same manner as in Comparative Example 1, and the reflection spectrum was measured for black visibility measurement, and the result is shown in FIG.

Example  2

Except that a black pigment (Titanium Black) was added to the anti-glare hard coating composition in an amount of 1 wt% based on the solids content of the dye relative to the solids content of the coating layer composition in the anti-glare low-reflection coating layer of Comparative Example 2 A film was prepared in the same manner as in Comparative Example 2 and the transmission spectrum was measured. The results are shown in Fig. 11. The results are shown in Fig. 11. The results are shown in Fig.

Example  3

Except that a black pigment (Titanium Black) was added to the anti-glare hard coating composition in the anti-glare low-reflection coating layer of Comparative Example 2 in an amount of 1.5% by weight based on the solids content of the dye relative to the solids 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. Further, a protective film of a polarizing plate was attached in the same manner as in Comparative Example 2, and the reflection spectrum for black tint measurement was measured. The results are shown in Fig.

Example  4

Except that a black pigment (Titanium Black) was added to the antiglare hard coat composition in an amount of 2% by weight based on the solids content of the dye relative to the solids content of the coating layer composition in the anti-glare hard coating composition of Comparative Example 2 A film was prepared in the same manner as in Comparative Example 2 and the transmission spectrum was measured. The results are shown in Fig. 13. The results are shown in Fig. 13. The results are shown in Fig.

In comparison with the case of using 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 decreased in the propagation field, and in particular the reflectance between 500 nm and 740 nm appear. In addition, when the film of Example 2 was used (Fig. 11), the reflectance decreased in the field of propagation compared to the case of using the film of Comparative Example 2 (Fig. 9). It absorbs the yellow light reflected by the external light and shows the result that the black visual feeling is improved. Particularly, in the examples, the effect of reducing the panel reflectance was more excellent by forming the low reflection coating layer.

When the optical films of Examples 2, 3 and 4 were used (Figs. 11, 12, and 13), as the black pigment content increased, the absorption of yellow light reflected by the external light increased, And shows more improved results. In particular, in Examples 2, 3 and 4, the reduction of the reflectance between 500 nm and 740 nm was prominent as compared with Comparative Example 1.

Comparative Example  3

Triacetyl cellulose (TAC) prevent glare on the film coating (SGLR: Semi Glare-Low Reflection ) Glare After coating the composition as meyer bar 10 times, for 2 minutes and dried at 60 ℃ oven and irradiated with UV light of 80mJ / cm ² To form a coating layer having anti-reflective coating properties. The antiglare 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 a photoinitiator, 0.5 wt% of an additive, and 65 wt% of a solvent. The measurement results of the transmission spectrum of the optical film thus prepared are shown in Fig.

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

Example  5

A blue pigment (GJ1226) was added to the antiglare coating composition in the same manner as in Comparative Example 3, except that 500 ppm, 1,000 ppm, and 3,000 ppm, respectively, were added to the solids content of the coating layer composition based on the solids content of the dye. And the transmission spectrum was measured. The measurement result of the transmission spectrum of the optical film thus produced is shown in Fig.

Example 5 (Blue pigment, GJ1226, 1,000 ppm) and the optical film prepared in Comparative Example 3 were respectively mounted as a protective film of a polarizing plate provided on the opposite surface of the liquid crystal cell of the liquid crystal cell in the COT panel structure, The black visual improvement effect was measured. The results are shown in Fig. When the optical film of Comparative Example 3 was used, the reflectance of the optical film of Example 5 (A-27) was decreased in the case of using the optical film (A-35), and in particular, the reflectance was decreased between 500 nm and 740 nm Respectively. It absorbs the yellow light reflected by the external light and shows the result that the black visual feeling is improved.

Example  6

Neptun blue 755 was added to the antiglare coating composition in the same manner as in Comparative Example 3, except that 1,000 ppm and 3,000 ppm, respectively, were added to the solids content of the coating layer composition based on the solids content of the dye. Were measured. The measurement results of the transmission spectrum of the thus-produced optical film are shown in Fig.

Example  7

A film was prepared in the same manner as in Comparative Example 3 except that Basic blue 7 was added to the antiglare coating composition and 1,000 ppm and 3,000 ppm were added to the solids content of the coating layer composition based on the solid content of the dye, Were measured. The measurement results of the transmission spectrum of the optical film thus produced are shown in Fig.

Example  8

A film was prepared in the same manner as in Comparative Example 3 except that Orasol blue 855 was added to the antiglare coating composition in an amount of 3,000 ppm based on the solid content of the dye relative to the solids content of the coating layer composition, and the transmission spectrum was measured. The measurement results of the transmission spectrum of the optical film thus produced are shown in Fig.

Claims (23)

An antiglare film having a minimum point of transmittance at 560 nm or more in a transmission spectrum between 500 nm and 800 nm. [Claim 2] The antireflection film of claim 1, wherein the antiglare film comprises a transparent film and a coating layer provided on at least one side of the transparent film, wherein the coating layer absorbs at least a part of wavelengths selected from 560 nm to 800 nm Anti-glare film. The light absorbing agent according to claim 2, wherein the light absorbing agent is contained in an amount such that the absorption at a wavelength absorbed by the light absorbing agent is increased by 1% or more as compared with that before the light absorbing agent is added, Anti-glare film. The antiglare film according to claim 2, wherein the light absorbing agent is contained in an amount of 10 ppm or more and 5 wt% or less with respect to the coating layer. The antiglare film according to claim 2, wherein the transparent film or coating layer is a hard coating layer, an antireflection layer, or a low reflection layer. The antiglare film according to claim 1, wherein the anti-glare film comprises a transparent film and a light absorbing agent that absorbs at least a part of the wavelengths selected from 560 nm to 800 nm dispersed in the transparent film. [7] The light absorbing material as set forth in claim 6, wherein the light absorbing agent is an amount of not less than an amount such that the absorption at a wavelength absorbed by the light absorbing agent is increased by at least 1% The anti-glare film is included. The antiglare film according to claim 6, wherein the light absorbing agent is contained in an amount of 10 ppm or more and 5 wt% or less with respect to the antiglare film. [2] The anti-glare film according to claim 1, wherein the anti-glare film comprises: a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer absorbs at least a part of the wavelength selected from 560 nm to 800 nm, wherein a further layer is provided between the transparent film and the coating layer, the additional layer comprising a light absorbing material that absorbs at least some of the wavelengths selected from the range of from about 1 nm to about 800 nm. [2] The anti-glare film according to claim 1, wherein the anti-glare film comprises: a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer absorbs at least a part of the wavelength selected from 560 nm to 800 nm, wherein a further layer comprising a light absorbing material that absorbs at least a portion of the wavelength selected from the range of from about 1 nm to about 800 nm is provided between the transparent film and the coating layer, and the transparent film is a hard coating layer. An anti-glare film having a transmittance of 60% to 96% with respect to a standard light source D65. 12. The anti-glare film as claimed in claim 11, wherein the anti-glare film comprises 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. 12. 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. [12] The anti-glare film of claim 11, wherein the anti-glare film comprises: a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer comprises a black or blackening material, or a further layer comprising a black or blackening material, And the coating layer. [12] The anti-glare film of claim 11, wherein the anti-glare film comprises: a transparent film; And a coating layer provided on the transparent film and having a refractive index lower than that of the transparent film, wherein the transparent film or the coating layer comprises a black or blackening material, or a further layer comprising a black or blackening material, And the coating layer, wherein 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 luminance enhancement film, or a surface protective film. A polarizer, and a polarizing plate protective film provided on at least one side of the polarizer, wherein the polarizing plate protective film is an anti-glare film according to any one of claims 1 to 15. A liquid crystal cell provided on the color filter; and a polarizing plate provided on the liquid crystal cell, the polarizing plate including a polarizer and a protective film for a polarizing plate provided on at least one surface of the polarizer, Wherein an anti-glare film according to any one of claims 1 to 15 is provided as the protective film for the polarizer, or between the liquid crystal cell and the polarizer, or on the opposite side of the polarizer opposite to the liquid crystal cell . 19. 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 surface of the polarizer facing the liquid crystal cell. 21. The display device according to claim 19, wherein the anti-glare film comprises a transparent film and a coating layer provided on the opposite side of the side opposite to the polarizer of the transparent film. 19. The display device according to claim 18, wherein the display device further comprises a backlight unit provided on a side opposite to the surface of the thin film transistor facing the color filter, and the contrast in the ON state of the display device provided between the backlight unit and the thin film transistor And a non-adjusting optical film. The display device according to claim 18, further comprising one or more transparent conductive films provided on at least a portion of the surface of the electrode included in the thin film transistor facing the color filter. 22. The display device according to claim 21, wherein the transparent conductive film is an ITO layer.

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