WO2009001911A1 - 光学フィルムおよびその製造方法、並びにそれを用いた防眩性偏光子および表示装置 - Google Patents
光学フィルムおよびその製造方法、並びにそれを用いた防眩性偏光子および表示装置 Download PDFInfo
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- WO2009001911A1 WO2009001911A1 PCT/JP2008/061680 JP2008061680W WO2009001911A1 WO 2009001911 A1 WO2009001911 A1 WO 2009001911A1 JP 2008061680 W JP2008061680 W JP 2008061680W WO 2009001911 A1 WO2009001911 A1 WO 2009001911A1
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- optical film
- fine irregularities
- comb
- optical
- angle
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Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/118—Anti-reflection coatings having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0226—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures having particles on the surface
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24479—Structurally defined web or sheet [e.g., overall dimension, etc.] including variation in thickness
Definitions
- the present invention relates to an optical film, a method for producing the same, an antiglare polarizer using the same, and a display device.
- an optical film used for various display devices such as a liquid crystal display, a plasma display, a rear projection display, an electro-luminescence display, a CRT (Cathode Ray Tube) display, a touch panel display, a manufacturing method thereof, and the like
- the present invention relates to an anti-glare polarizer and a display device using the same. Background art
- FIG. 1 shows the structure of a conventional antiglare film 10 1.
- This anti-glare film 1001 has a substrate 1 1 1 and an anti-glare layer 1 1 2 provided on the substrate 1 1 1.
- the antiglare layer 1 1 2 is composed of a resin containing fine particles 1 1 3 made of amorphous silica or resin beads. By projecting the fine particles 1 1 3 from the surface of the antiglare layer 1 1 2, Fine irregularities are formed.
- This anti-glare film 101 is formed by applying a paint containing fine particles 11 13, a resin, a solvent and the like onto the base material 11 1 1 and curing the paint.
- the light incident on the anti-glare layer 1 1 2 is scattered by the fine irregularities on the surface of the anti-glare layer 1 1 2, so that reflection due to surface reflection is reduced. .
- the fine irregularities on the surface of the antiglare film 10 1 are composed of fine particles 1 1 3 protruding on the surface, and a part of the binder formed with a continuous slope between the protrusions of the fine particles 1 1 3.
- the light transmitted through the antiglare layer 112 in the vertical direction is also strongly scattered, resulting in a problem that transmitted map clarity is lowered.
- Japanese Patent No. 3 5 0 7 7 1 9 and Japanese Patent No. 3 5 1 5 4 0 by adjusting internal scattering, the glare is clear while maintaining anti-glare properties.
- Techniques for improving are disclosed.
- Japanese Patent No. 3 6 6 1 4 9 1 discloses a technique for improving glare by making the average interval of the unevenness of the antiglare layer sufficiently finer than the pixel size of the image display device. Disclosure of the invention
- an object of the present invention is to provide an optical film having anti-glare properties and excellent transmission image clarity, a method for producing the same, and an anti-glare polarizer optoelectronic display device using the same. is there. Means for solving the problem
- the present inventors have mixed a substantially flat portion and a portion having an inclination angle on the surface of the optical film, and controlled the diffuse reflection characteristics thereof, so that the transmission map is clear while maintaining the antiglare property.
- the first invention has fine irregularities on the surface, and the average interval between the fine irregularities is 300 ⁇ m or less,
- the second invention has fine irregularities on the surface
- the average interval of fine irregularities is 300 m or less
- the third invention has fine irregularities on the surface
- the average interval of fine irregularities is 300 m or less
- the value C (2.0) of the transmitted map measured using an optical comb with a comb width of 2 mm is 30% or more
- the optical film has a ratio C (0.1.25) / C (2,0) with respect to 5) of 0.1 or more.
- the fourth invention is a method for producing an optical film having fine irregularities on its surface
- the average interval of fine irregularities is 300 m or less
- the angle dependence derivative d ⁇ Log (I ( ⁇ )) ⁇ / da of the logarithmic intensity L og (I ( ⁇ )) in the direction of declination from the specular reflection direction has an extreme value. It is a manufacturing method.
- the fifth invention is a method for producing an optical film having fine irregularities on the surface.
- the average interval between the fine irregularities is 300 ⁇ m or less
- the sixth invention is a method for producing an optical film having fine irregularities on its surface
- the average interval between the fine irregularities is 300 m or less
- the value C (2.0) of transmitted map sharpness measured using an optical comb with a comb width of 2 mm is 30% or more.
- the seventh invention comprises a polarizer
- An optical film provided on a polarizer
- the average interval between the fine irregularities is 300 m or less
- the eighth invention comprises a polarizer
- An optical film provided on a polarizer
- the average interval between the fine irregularities is 300 ⁇ m or less
- the ninth invention comprises a polarizer
- An optical film provided on a polarizer
- the average interval between the fine irregularities is 300 m or less
- the transmitted image clarity value C (2.0) measured using an optical comb with a comb width of 2 mm is 30% or more.
- the ratio of C (0.12 5) / C (2.0) to 5) is an antiglare polarizer having a ratio of 0.1 or more.
- a tenth aspect of the invention is a display unit for displaying an image
- An optical film provided on the display surface side of the display unit
- the average interval between the fine irregularities is 300 ⁇ m or less
- Display device in which differential angle d of differential log intensity L og (I ( ⁇ )) from specular reflection direction toward declination d ⁇ L og (I ( ⁇ )) ⁇ Zd ⁇ has an extreme value It is.
- a first invention is a display unit for displaying an image
- An optical film provided on the display surface side of the display unit
- the average interval between the fine irregularities is 300 m or less
- the first and second inventions include a display unit for displaying an image
- An optical film provided on the display surface side of the display unit
- the average interval between the fine irregularities is 300 ⁇ m or less
- the transmitted image clarity value C (2.0) measured using an optical comb with a comb width of 2 mm is 30% or more.
- the display device is a ratio C (0.1 2 5) / C (2.0) force S, 0.1 or more with respect to 5).
- a histogram for the inclination angle of the fine irregularities on the optical film surface, the derivative of ⁇ ( ⁇ ) d ⁇ P (j3) ⁇ / d] 3 Since it has an extreme value, it has a surface shape with a relatively flat part that improves the sharpness of the image and a part that has a certain degree of tilt angle that produces anti-glare properties, and concentrates light at a low angle. It can be diffusely reflected at a wide angle while reflecting.
- a fine image can be displayed more clearly by defining the value of the transmission map definition.
- reflection on the surface of the optical film can be prevented by defining the interval between the fine irregularities.
- FIG. 1 is a schematic cross-sectional view showing an example of the configuration of a conventional anti-glare film
- FIG. 2 is a schematic cross-sectional view showing an example of the configuration of a conventional anti-glare film
- FIG. FIG. 4 is a schematic sectional view showing an example of the configuration of the liquid crystal display device according to the first embodiment.
- FIG. 4 is a schematic sectional view showing an example of the configuration of the antiglare film according to the first embodiment of the present invention.
- Fig. 6 is a schematic diagram for explaining the relationship between transmitted image clarity and anti-glare property in a conventional anti-glare film.
- Fig. 6 is a graph showing an example of diffuse reflection characteristics in a conventional anti-glare film.
- FIG. 7B are schematic diagrams for explaining the diffuse reflection characteristics of the antiglare film according to the first embodiment of the present invention
- FIG. 8 is the first embodiment of the present invention.
- Fig. 9 is a schematic diagram schematically showing an example of the declination ⁇ from the reflected light of the antiglare film by Fig. 9,
- Fig. 9 is a schematic diagram for explaining the principle of measurement of transmitted map clarity
- Fig. 10 FIG. 10B is a schematic diagram for explaining image sharpness and image contrast
- FIGS. 11A to 11B are diagrams showing a low antiglare film according to the first embodiment of the present invention.
- FIG. 12 is a schematic cross-sectional view showing an example of the configuration of an antiglare film according to the second embodiment of the present invention, and FIG.
- FIG. 12 is a schematic cross-sectional view showing an example of the distribution of angular reflection portions and wide-angle diffuse reflection portions.
- FIG. A to FIG. 1 3 FIG. E is a schematic sectional view showing an example of a method for producing an antiglare film according to the second embodiment of the present invention
- FIG. FIG. 15 is a schematic cross-sectional view showing an example of the structure of a touch panel of a display device according to a third embodiment of the present invention
- FIG. 15 is a graph showing diffuse reflection characteristics of Example 2, Example 4 and Example 5
- Fig. 6 is a graph showing the diffuse reflection characteristics of Example 7 and Comparative Example 7
- Fig. 17 is a graph showing the transmission map clarity of each comb width of Example 7 and Comparative Example 7.
- FIG. 18 is a graph showing transmitted map clarity in each comb width of Examples 1 to 5 and Comparative Examples 1 to 5, and FIG. 19 is Examples 6 to 3 6 is a graph showing the result of reflection evaluation of each antiglare film of 0. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 3 shows an example of the configuration of the liquid crystal display device according to the first embodiment of the present invention.
- the liquid crystal display device includes a backlight 3 that emits light, and a liquid crystal panel 2 that displays an image by temporally and spatially modulating the light emitted from the backlight 3.
- a backlight 3 that emits light
- a liquid crystal panel 2 that displays an image by temporally and spatially modulating the light emitted from the backlight 3.
- Polarizers 2 a and 2 b are provided on both sides of the liquid crystal panel 2, respectively.
- An anti-glare film 1 is provided on the polarizer 2 provided on the display surface side of the liquid crystal panel 2.
- the backlight 3 for example, a direct backlight, an edge backlight, and a planar light source backlight can be used.
- the pack light 3 includes, for example, a light source, a reflector, and an optical film.
- the light source include a cold cathode fluorescent lamp (CCFL), a hot cathode fluorescent lamp (HC FL), an organic electroluminescence (OEL), and a light emitting diode (Light).
- CCFL cold cathode fluorescent lamp
- HC FL hot cathode fluorescent lamp
- OEL organic electroluminescence
- LED light emitting diode
- LED Emitting Diode
- LCD panel 2 examples include Twisted Nematic (TN) mode, Super Twisted Nematic (STN) mode, Vertically Aligned (VA) mode, and Horizontal (In- Plane) mode.
- Polarizers 2 a and 2 b are provided on both surfaces of the liquid crystal panel 2 so that their transmission axes are orthogonal to each other. Polarizers 2 a and 2 b pass only one of the orthogonal polarization components of the incident light and block the other by absorption. It is a good thing.
- Polarizers 2a and 2b include, for example, hydrophilic polymer films such as poly (vinyl alcohol) film, partially honole meranolized polyvinylinol alcohol film, and ethylene 'vinyl acetate copolymer partially saponified film. A material obtained by adsorbing a dichroic substance such as a dichroic dye and stretching it uniaxially can be used.
- FIG. 4 is an enlarged cross-sectional view showing an example of the configuration of the antiglare film 1 according to the first embodiment of the present invention.
- the antiglare film 1 has a base material 1 1 and an antiglare layer 12 provided on the base material 1 1.
- the antiglare layer 12 includes fine particles 13 and has fine irregularities formed on the surface thereof. '
- the present inventors can improve the contrast of minute images while having antiglare properties by defining the diffuse reflection characteristics as follows. Succeeded in obtaining a possible anti-glare film1.
- Anti-glare property is manifested by scattering regular reflection light around the outside light incident from around the display device. Therefore, the technology to form surface irregularities on the surface of the anti-glare film 1 or to diffuse the reflected light by mixing the media with different refractive index in the inner layer and using the internal diffusion due to the interface reflection.
- the antiglare property can be imparted by the technology to be applied.
- surface diffusion or internal diffusion also diffuses the transmission map itself of the display device that passes through the antiglare layer. Therefore, if the diffusion is strong, there is a side effect that the image light appears blurred and unclear. In other words, as shown in Fig.
- FIG. 6 is an example of the diffuse reflection characteristics of the conventional antiglare film as shown in FIGS. 1 and 2 described above.
- the horizontal axis shows the reflection angle when the regular reflection direction is 0 °
- the vertical axis shows the reflection log intensity.
- the balance of diffuse reflection characteristics is adjusted by adjusting the particle size, added amount, film thickness, etc. of the mixed particles as shown by curves a to e in Fig. 6. .
- curve a the amount of reflected light at a low angle is large, and the amount of diffusely reflected light at a wide angle is small. Therefore, an anti-glare film having excellent transmitted image clarity but inferior anti-glare properties is obtained.
- curve e is an antiglare film that is excellent in antiglare property but inferior in transmitted image clarity.
- FIG. 7A is a schematic diagram for explaining the diffuse reflection characteristics of the antiglare film according to the first embodiment of the present invention
- FIG. 7B is a reflection log intensity L og shown in FIG. 7A. It is a graph showing the angular dependence derivative d ⁇ Log (I ( ⁇ )) ⁇ / d ⁇ of (I ( ⁇ )).
- FIG. 8 is a schematic view schematically showing an example of the deviation angle ⁇ shown in FIG.
- declination ⁇ , I ((), Log (I (a)), 00, ⁇ 1 are as shown below.
- reflection intensity I () and reflection log intensity L o in specular reflection direction 2 2 When g (I (a)) is maximum, the angle 0 is 0 °.
- the diffuse reflection characteristics of the antiglare film 1 of the first embodiment of the present invention are as follows. As shown in FIG. 7A, the low angle reflection component concentrated at the low angle and the wide angle diffusion distributed from the medium angle to the wide angle. Both the reflection component and the reflection component are included. Specifically, when the angle of declination is 1 a 1 ⁇ a, it shows the diffuse reflection characteristic of the low angle reflection component indicated by the dotted line, and the angle of declination a is a> a 1, a In the case of G 1 a 1, the diffuse reflection characteristic of the wide-angle diffuse reflection component indicated by a straight line is shown.
- the angular dependence derivative d ⁇ L og (I (a))) ⁇ / da of the reflected log intensity L og (I (a)) is As shown in B, the extreme value is shown at angle a. That is, the differential d ⁇ Log (I (a)) ⁇ Zda has a maximum value at an angle a and a minimum value at an angle H.
- the first embodiment since the first embodiment has both the low angle reflection component and the wide angle diffusion reflection component in the diffuse reflection characteristic, it is possible to adjust the amount of diffused light by independently controlling these components. For example, by increasing the low-angle reflection component without causing a decrease in the wide-angle diffuse reflection component, it is possible to further improve the transmission map clarity while maintaining the antiglare property.
- the ratio of the low-angle reflection intensity and the wide-angle diffuse reflection intensity is large, the low-angle reflection is felt strongly, and the edge of the reflected image is easily visible. But Therefore, it is preferable to adjust the ratio of low angle reflection intensity to wide angle diffuse reflection intensity. Since the human eye is sensitive to the log intensity of light, it is important to adjust for the difference between these log intensities. In addition, the way you feel the reflection varies depending on the degree of minute diffusion of the low-angle reflection itself. Therefore, when the low-angle reflection shown in Fig. 7 is hardly diffused, that is, when the angle angle 1 is small, the reflected edge will not appear unless the ratio of the low-angle reflection intensity to the wide-angle diffuse reflection intensity is small. When the low-angle reflection is slightly diffused, that is, when the angle ⁇ 1 is relatively large, it is difficult to visually recognize even if the ratio is slightly large.
- the declination single logarithmic intensity difference L og (I ( ⁇ 0))-L og (I ( ⁇ 1)) preferably satisfies the relationship of the following equation 1, more preferably the following equation 1 ′ By satisfying the relationship, it is possible to further improve the antiglare property and the transmitted image clarity.
- the angle 1 is preferably 6 ° or less, and more preferably 4 ° or less, the transmitted map clarity is further improved, and a high-definition image can be observed.
- the angle a 1 is larger than 6 °, the refractive index of the medium is considered to be about 1.5 to 1.6, and the refraction angle of the transmitted light is about 2 ° or more. Transmitted light away from the direction This is because the divergence of the light does not form an image on the retina, and the effect on the clearness of the transmitted map is reduced. For this reason, it is more preferable to adjust the angle 1 according to the viewing distance.
- Anti-glare layer 1 2 Rather than forming a smooth and convex shape on the surface smoothly, a part with a relatively low inclination angle and a part with a certain degree of inclination to develop anti-glare properties are shown below. By mixing them so as to have the characteristics as shown, it is possible to obtain the anti-glare film 1 having anti-glare characteristics and high-definition characteristics even for fine images.
- a two-dimensional surface roughness curve is measured in accordance with JISB 0 60 1: 2 0 1, and each slope angle is calculated by taking the derivative of the curve.
- the togram is P (
- the surface shape is controlled so that the derivative d ⁇ P (j3) ⁇ Zd; 8 has extreme values (maximum value and minimum value).
- the characteristic that doubles the angle of the histogram P ( ⁇ ) corresponds to the diffuse reflection characteristic. That is, since there is a correlation between the histogram G ( ⁇ ) and the above-mentioned diffuse reflection characteristics, the antiglare layer 1 so that the derivative d ⁇ P (j3) ⁇ Zd] 3 of the histogram G ( ⁇ ) has an extreme value. This is because the diffuse reflection characteristics as described above can be obtained by controlling the surface shape of 2.
- the histogram P ( ⁇ ) can be defined as follows in the same manner as the reason for specifying the diffuse reflection characteristic as described above.
- the logarithmic frequency difference between the inclination angle i3 and the logarithmic frequency difference L og (P 0))-L og (P ( ⁇ 1)) preferably satisfies the relationship of the following equation 2 and more preferably satisfies the relationship of the following equation 2 ′.
- the transmitted map clarity is further improved, and a high-definition image can be observed.
- the image clarity measuring device includes a light source 31, a slit 3 2, a lens 3 3 and a lens 3 5, an optical comb 3 6, and a light receiver 3 7.
- a test piece 3 4 (for example, an antiglare film 1) that is a measurement object is disposed between the lens 35 and the lens 35.
- the slit 3 2 is arranged at the focal position of the lens 3 3, and the optical comb 3 6 is arranged at the focal position of the lens 35.
- optical combs 36 having a comb width of 2 mm, 1 mm, 0.5 mm, 0.25 mm, and 0.125 mm, which are appropriately selected and used.
- the light emitted from the light source 31 is taken out as a pseudo point light source by the slit 32, and passes through the lens 33 to be parallel light. After passing vertically through 34, it is condensed again using the lens 35, and the light passing through the optical comb 36 is received by the receiver 37, and the contrast of light and dark is obtained by calculation. . If specimen 3 4 is not present, or specimen 3 4 is an optically uniform medium, the light is condensed to the size of slit 3 2 at the optical comb 3 6, so the optical If the opening size of the comb 36 is wider than the slit 32, the received light becomes 100% and 0% corresponding to the transparent portion and the opaque portion of the optical comb 36, respectively.
- the image of the slit 3 2 formed on the optical comb 36 becomes thick due to the blur, so the slit is formed at the transmission portion. 3 Both ends of the image of 2 are applied to the opaque part, and the amount of light that is 100% decreases. In addition, at the position of the opaque part, light leaks from the opaque part at both ends of the slit image, and the amount of light increases by 0%.
- the measured transmitted map definition value C is defined by the following equation from the maximum transmitted light value M of the transparent portion of the optical comb 36 and the minimum transmitted light value m of the opaque portion.
- Transmission map definition value C (%) ⁇ (Mm) / (M + m) ⁇ X 1 0 0
- Transmission map definition value is high if the transmission map definition C is large, and so-called blur or distortion if the value is small
- the transparency C value (2.0) measured using an optical comb with a width of 2 mm in accordance with JIS-K 7 10 5 is a value with a comb width of 2 mm. It is appropriately called C (2.0).
- the values of transmitted map sharpness measured using optical combs with lmm, 0.5mm, 0.25mm, and 0.125mm are shown in the figure.
- the value C (2.0) of the comb width 2 mm of the antiglare film 1 is 30% or more, preferably 60% or more, and more preferably 70% or more. This is because, when the value C (2.0) of the comb width 2 ⁇ m is lower than 30%, even a relatively coarse pitch image which is not high definition appears blurred.
- FIG. 10A shows the display of a black and white image, and the edge portion E shown by the arrow indicates the boundary between white and black of the image.
- Figure 10B shows the luminance curve of the transmission map.
- the luminance curves f to h in Fig. 10B show the following luminance curves.
- Luminance curve f Luminance curve when a black and white image is displayed on a screen to which no antiglare film is applied
- Luminance curve h Luminance curve when a monochrome image is displayed on a screen using a conventional anti-glare film
- Luminance curve g Luminance curve when a monochrome image is displayed on a screen to which the antiglare film 1 of the first embodiment is applied.
- the conventional anti-glare film refers to the anti-glare film 100 shown in FIG.
- the brightness changes sharply at the edge E of the black-and-white image as shown by the brightness line curve f. Therefore, the contrast of the black and white image can be felt very high when the display screen is observed.
- the anti-glare film 10 1 When the anti-glare film 10 1 is provided on the display screen, the brightness does not change sharply at the edge E as shown by the brightness curve h, and becomes smooth. Therefore, there is a problem that the edge becomes unclear and the video looks blurred.
- the transmitted image luminance is shown as the luminance curve h, the value C (2.0) for a relatively coarse comb width of 2 mm and the comb width of a fine comb width of 0.1 2 25 mm Value C (0. 1 2 5) is significantly different. Therefore, these ratios C (0.1 2 5) / C (2.0) are smaller than 0 ⁇ 1.
- the change in luminance is gentle in the portion other than the edge portion E as shown in the luminance curve g.
- the brightness changes abruptly. Therefore, even if the portion other than the edge portion E is slightly blurred, the contrast can be felt high. Therefore, even if the optical comb width changes slightly, the difference in the value C of the transmitted map definition becomes small, and the value of the comb width 2 mm 'C (2.0) and the comb width 0.1 2
- the ratio C (0. 1 2 5) / C (2. 0) to the value C (0. 1 2 5) of 5 mm is 0.1 or more.
- the ratio between the value C (2.0) of the comb width 2 mm and the value C (0.1 2 5) of the comb width 0.125 mm is that the pitch is coarse and fine.
- the clarity of transmitted map does not change greatly.
- the anti-glare film 1 of the first embodiment is superior in sharpness at a fine pitch as compared with the conventional case, so that a fine image can be displayed more clearly and the edge can be emphasized, and the contrast can be improved. It is thought that high images can be obtained.
- the fine HO convex average interval (average peak / valley interval: S m) is preferably 5 m or more and 300 ⁇ m or less, and more preferably 5 / m or more and 220 ⁇ m or less.
- S m average peak / valley interval
- the average distance when the average distance is 300 m or more, there are a part with a relatively low inclination angle that defines low-angle reflection and a part with a certain degree of inclination to develop anti-glare properties. Will be seen separately, and you will feel a strong reflection.
- the average interval is smaller than 5 ⁇ , it is difficult to control separately the low-angle reflection component and the wide-angle diffusion reflection component in the diffuse reflection characteristic.
- a portion having a relatively low inclination angle on the surface of the antiglare layer 12 is appropriately referred to as a low angle reflection portion, and a portion having a certain degree of inclination is appropriately referred to as a wide angle diffuse reflection portion.
- FIG. 11 shows an example of the distribution of the low angle reflection portion and the wide angle diffuse reflection portion on the surface of the antiglare layer 12 of the antiglare film 1.
- a wide-angle diffuse reflection part 4 2 having a certain inclination angle is distributed around the fine particle protrusion 4 1 formed by the fine particle 1 3, and a relatively flat low-angle reflection part 4 3 therebetween. Is distributed.
- the average interval of fine irregularities is 300 m or less, but in the case of the distribution shown in Fig. 11 A, the low-angle reflection component 4 3 is formed continuously, so the reflection is strong End up.
- the ratio between the wide-angle diffuse reflection part 42 and the low-angle reflection part 43 it is preferable to control the ratio between the wide-angle diffuse reflection part 42 and the low-angle reflection part 43 so that the distribution shown in FIG.
- the above-mentioned diffuse reflection characteristics can be obtained.
- the distribution of the wide-angle diffuse reflector 4 2 and the low-angle reflector 4 3 as shown in Fig. 11 is high on the uneven surface using, for example, a confocal laser microscope or a stylus roughness meter. The distribution can be confirmed by obtaining an image.
- the average film thickness of the antiglare layer 12 is preferably 3 to 30 ⁇ m, and more preferably 4 to 15 ⁇ m. If the film thickness is less than 3 m, it is difficult to obtain the desired hardness, and if it is more than 30 m, curling may occur in the process of curing the resin during manufacturing.
- the fine particles 13 for example, spherical or flat inorganic fine particles or organic fine particles are used.
- the average particle size of the fine particles 13 is preferably about 5 nm to 15 m, more preferably 1 ⁇ ! ⁇ 10 m, more preferably 1.5 / m ⁇ 7.5 ⁇ . 1. If the particle size is smaller than 5 ⁇ m, the particles are likely to aggregate in the paint, making it difficult to control the appropriate surface. Even if small particles can be dispersed using a particle dispersant, etc., the particle size is smaller than 5 nm. Then, the antiglare layer 1 2 The surface roughness becomes too fine and the antiglare property is poor.
- the average particle diameter of the fine particles 13 can be measured by, for example, a dynamic light scattering method, a laser diffraction method, a centrifugal sedimentation method, a FF F (Field Flow Fractionation) method, or a pore electrical resistance method.
- organic fine particles examples include acrylic resin (PMMA), styrene (PS), acrylic-styrene copolymer, melamine resin, and polycarbonate. (PC) beads can be used.
- the organic fine particles are not particularly limited to cross-linking or non-cross-linking, and any organic fine particles can be used as long as they are made of plastic.
- the inorganic fine particles are not particularly limited, such as regular silica, alumina, calcium carbonate, barium sulfate, etc., and known inorganic fine particles can be used, and the difference in refractive index from the resin used. It is possible to select appropriately considering the above.
- a transparent film, sheet, substrate, etc. can be used.
- a known high molecular material can be used.
- Known polymer materials include, for example, triacetyl cellulose (TAC), polyester (TPEE), polyethylene terephthalate (PET), polyimide (PI), polyamide (PA), aramide, polyethylene ( PE), polyatalylate, polyetherolenolephone, polysenolephone, polypropylene (PP), diacetyl cellulose, polychlorinated butyl, acrylic resin (PMMA), polycarbonate (PC), epoxy resin, Examples include urea resin, urethane resin, and melamine resin.
- the thickness of the substrate 11 is preferably 38 m to 100 m from the viewpoint of productivity, but is not particularly limited to this range.
- the substrate 11 preferably has a function as a protective film for the polarizer 2 b. This is because it is not necessary to separately provide a protective film on the polarizer 2 b, so that the polarizer 2 b having the antiglare film 1 can be thinned.
- the manufacturing method of this anti-glare film 1 is as follows: A paint containing a child 13, a resin, and a solvent is applied, and after the solvent is dried, the resin is cured.
- a resin for example, a resin, the above-described fine particles 13 and a solvent are mixed with a stirrer such as a disperser or a disperser such as a bead mill to obtain a paint in which the fine particles 13 are dispersed.
- a stirrer such as a disperser or a disperser such as a bead mill to obtain a paint in which the fine particles 13 are dispersed.
- a light stabilizer, an ultraviolet absorber, an antistatic agent, a flame retardant, an antioxidant and the like may be further added.
- silli force fine particles or the like may be further added.
- the solvent for example, an organic solvent that dissolves the resin raw material to be used, has good wettability with the fine particles 1 3, and does not whiten the base 1 1 1 can be used. Examples of organic solvents include tertiary butanol and isopropyl acetate.
- an ionizing radiation curable resin that is cured by ultraviolet rays or electron beams, or a thermosetting resin that is cured by heat is preferable, and a photosensitive resin that can be cured by ultraviolet rays is most preferable.
- a photosensitive resin for example, acrylate resins such as urethane acrylate, epoxide acrylate, polyester acrylate, polyol acrylate, polyether acrylate, and melamine acrylate can be used.
- characteristics after curing those having excellent translucency from the viewpoint of image transparency and those having a high hardness from the viewpoint of scratch resistance are particularly preferred, and can be appropriately selected.
- the ionizing radiation curable resin is not particularly limited to the ultraviolet curable resin and can be used as long as it has translucency. However, the hue of transmitted light and the amount of transmitted light are notable due to coloring and haze. Those that do not change are preferred.
- Such a photosensitive resin is obtained by blending a photopolymerization initiator with an organic material such as a monomer, oligomer, or polymer that can form a resin.
- the urethan acrylate resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting an acrylate or methacrylate monomer having a hydroxyl group with the obtained product.
- the photopolymerization initiator contained in the photosensitive resin for example, a benzophenone derivative, a acetophenone derivative, an anthraquinone derivative or the like can be used alone or in combination.
- This photosensitive resin may be further appropriately selected and combined with a component that improves film formation, such as an acryl-based resin.
- urethane resin acrylic resin, methacrylic resin, styrene resin, melamine resin, cellulosic resin, ionizing radiation curable oligomer, thermosetting oligomer, which are fixed to the photosensitive resin by at least drying. It is possible to mix and use as appropriate. By appropriately mixing the above resins, the hardness and curl of the antiglare layer 12 can be adjusted.
- the polymer is not limited to the above, and it is preferable to use a polymer having an ionizing radiation sensitive group such as an acrylic double bond and a thermosetting group such as a 1 OH group.
- the specific gravity difference between the fine particles 13 included in the coating material and the liquid component before coating it is preferable to adjust the specific gravity difference between the fine particles 13 included in the coating material and the liquid component before coating to cause appropriate precipitation and Z or aggregation of the fine particles 13. .
- desired fine irregularities in which a low-angle reflecting portion having a relatively low inclination angle and a wide-angle reflecting portion having an inclination are mixed can be formed on the surface of the coating film.
- it is preferable to adjust the surface tension difference between the fine particles 13 and the resin This is because, during the drying / curing of the resin, it is possible to control the cured shape of the resin connecting between the fine particles 1 3 and the fine particles 1 3.
- the coating method is not particularly limited, and a known coating method can be used.
- a known coating method for example, as a known coating method, for example, a micro gravure coating method, a wire bar coating method, a direct gravure coating method, a die coating method, a dip method, a spray coating method, a reverse coating method, or the like. Examples include the Le Coat method, the curtain coat method, the comma coat method, the knife coat method, and the spin coat method.
- the solvent is volatilized by drying.
- the drying temperature and drying time can be appropriately determined depending on the boiling point of the solvent contained in the paint. In that case, considering the heat resistance of the base material 11 1, it is preferable to select the base material within a range in which the base material is not deformed by heat shrinkage.
- the antiglare layer 12 is formed by curing the resin.
- sources of curing energy include electron beams, ultraviolet rays, visible rays, and gamma rays, but ultraviolet rays are preferable from the viewpoint of production facilities.
- the ultraviolet light source is not particularly limited, and a high-pressure mercury lamp, a metal halide lamp, or the like is appropriately used.
- the integrated dose can be appropriately selected so that the resin to be used is cured and the resin and the substrate 11 are not yellowed.
- the irradiation atmosphere can be appropriately selected according to the degree of resin curing, and can be performed in air or in an inert atmosphere such as nitrogen or argon.
- the temperature of the base material 11 and the coating film it is preferable to adjust the temperature of the base material 11 and the coating film to control the cured shape of the resin connecting between the fine particles 13 and the fine particles 13. example For example, by raising the temperature of the base material 11 to some extent, the resin on the base material 11 is leveled, and a relatively flat low-angle reflection portion is formed on the surface of the antiglare layer 1 2. Therefore, the temperature of the base material 11 is adjusted in consideration of the ratio of the low angle reflection part and the wide angle reflection part.
- the intended antiglare film can be obtained.
- the antiglare film 1 controls the fine unevenness of the surface, and controls the ratio of the low angle reflection component and the wide angle diffusion reflection component in the diffuse reflection characteristics, respectively.
- the value C (2.0) of the comb width 2 mm is 30% or more, and the value C (2.0) of the comb width 2 mm and the comb width 0.1 2 25 mm
- the ratio of the value C (0.1 2 5) to C (0.1 2 5) / C (2.0) force is 0.1 or more, so it is possible to display a fine image with more clarity and edge. Can stand out. Therefore, it is possible to realize an antiglare film excellent in transmitted image clarity and antiglare property.
- this antiglare film 1 for a display device such as a liquid crystal display device, the visibility of the displayed image can be improved.
- FIG. 12 shows an example of the structure of the antiglare film 1 according to the second embodiment of the present invention.
- the antiglare film 1 includes a base material 11 and an antiglare layer 12 provided on the base material 11. The same as in the first embodiment, except that the antiglare layer 12 does not contain the fine particles 13. (2-2) Manufacturing method of antiglare film
- the production method of the antiglare film 1 is to produce a matrix by fine processing and obtain desired fine irregularities by a shape transfer method.
- a base material to be processed is prepared.
- the shape of the base material include a substrate shape, a sheet shape, a film shape, and a block shape.
- the material for the base material include plastic, metal, and glass.
- the substrate is processed using a mask imaging method using, for example, a KrF excimer laser, and a fine uneven shape corresponding to the surface of the antiglare layer 2 is patterned on the surface of the substrate. As a result, as shown in FIG. 13A, a matrix 51 having fine irregularities opposite to the antiglare layer 12 is obtained.
- a conductive film is formed on the fine irregularities of the mother die 51 obtained as described above by, for example, an electroless plating method.
- the conductive film is a metal film made of a metal such as Eckel, for example.
- the mother die 51 on which the conductive film is formed is attached to an electric apparatus, and a metal plating layer such as a nickel plating layer is formed on the conductive film by, for example, an electric plating method. Thereafter, the metal plating layer is peeled off from the mother mold 51. As a result, as shown in FIG. 13B, a duplicate mold 52 having fine irregularities opposite to the mother mold 51 is obtained.
- a metal plating layer such as a nickel plating layer is formed on the fine irregularities of the duplicate mold 52 obtained as described above by, for example, an electric plating method. Thereafter, the metal plating layer is peeled off from the duplicate mold 52. As described above, as shown in Fig. 1 3 C, the duplicate mold 5 3 having the same fine irregularities as the mother mold 51 Is obtained.
- a photosensitive resin such as an ultraviolet curable resin is poured onto the fine unevenness of the replication mold 53 obtained as described above.
- the photosensitive resin for forming the antiglare layer 12 for example, the same resin as in the first embodiment can be used.
- the fine unevenness of the antiglare layer 12 is obtained by shape transfer, so it is not necessary to include fine particles in the photosensitive resin. However, if the haze value is used for fine adjustment of the surface shape, fine particles should be added. May be.
- the base material 11 that becomes the support base material is superposed on the replication mold 53. Then, for example, a force is applied to the base material 11 by a rubber roller to make the thickness of the photosensitive resin uniform.
- the substrate 11 is superposed on the replication mold 53. Then, for example, a force is applied to the base material 11 by a rubber roller to make the thickness of the photosensitive resin uniform.
- the photosensitive resin Irradiate light such as ultraviolet rays from the 1 side to cure, for example, the photosensitive resin. Thereafter, as shown in FIG. 13 E, the cured photosensitive resin is peeled off from the replication mold 53. As described above, the antiglare layer 12 is formed on one main surface of the substrate 11, and the target antiglare film 1 is obtained.
- FIG. 14 is a sectional view showing an example of the structure of the touch panel according to the third embodiment of the present invention.
- This touch panel is a resistive film type touch panel, and is provided on the display surface side of various display devices such as the liquid crystal display device shown in FIG. 3, for example, to constitute a touch panel display. .
- the lower base material 62 is a light-transmitting substrate such as glass, and a transparent electrode film 64 is formed thereon. On the transparent electrode film 64, Spacers 6 7 are formed. An insulating spacer 66 is disposed around the lower substrate 62, and the transparent film 63 is disposed so as to face the air layer 68. The transparent film 63 becomes a touch panel surface that is pressed by a finger, a pen, or the like, and a film having flexibility that can be deformed by such pressing is used. A transparent electrode film 65 is formed on the transparent film 63. An uneven layer 61 is provided on at least one of the transparent electrode film 64 and the transparent electrode film 65, for example, on the transparent electrode film 65.
- the transparent film 63 when the surface of the transparent film 63 is pressed with a finger, a pen or the like, the transparent film 63 is bent, and the transparent electrode film 65 at the pressed position in the transparent film 63 is formed on the lower base.
- Transparent electrode on material 6 2 Electricity flows in contact with film 6 4. The pressed position is detected by measuring the partial pressure ratio due to the resistance of the transparent electrode film 64 and the transparent electrode film 65 at this time.
- the uneven layer 61 used in the touch panel of the third embodiment an optical film similar to the antiglare film 1 of the first embodiment and the second embodiment described above can be used. Therefore, the description of the configuration and manufacturing method of the uneven layer 61 is omitted.
- the uneven layer 6 1 functions as an anti-Newton ring layer by preventing the Newton ring caused by light interference because the thickness of the air layer 58 slightly varies depending on the location when the surface of the transparent film 63 is pressed. To do.
- the four-convex layer 61 due to can suppress the glare caused by luminance variation of the display screen even when used in a high-resolution display device.
- the average particle size of the fine particles and the dry film thickness of the antiglare layer were measured as follows.
- the average particle size of the fine particles was obtained by measuring the particle size with a Coulter Multisizer and averaging the obtained data.
- the dry film thickness (average film thickness) of the antiglare layer was determined using a contact-type thickness measuring instrument (manufactured by TESA Corporation) as follows. First, the contact terminal had a cylindrical shape with a diameter of 6 mm, and the cylindrical terminal was brought into contact with the antiglare layer with a low load that did not collapse the antiglare layer. Then, an arbitrary point is measured five points to obtain the average value D A total thickness antiglare film. Furthermore, by measuring the thickness of the uncoated portion of the same substrate to determine the thickness D B of the base material. The value obtained by subtracting the base material thickness D B from the average value D A was defined as the antiglare layer thickness.
- the cut surface of the antiglare film can be produced by a microtome method or the like, and the thickness of the substrate can be measured.
- the film thickness is microscopic, it is preferable to obtain the average film thickness as in the former case.
- the raw materials shown in the following paint composition were blended, stirred for 2 hours with a disper, and then filtered through a 20 ⁇ m filter having a roughness 3 times the average particle size to obtain a paint.
- the obtained paint was applied to a 80 m thick TAC film
- the film was applied to one side of a film (manufactured by Shin Film Co., Ltd.) with a 90-line micro gravure at a peripheral speed ratio of 150% and a coating speed of 20 m / min.
- Multifunctional acrylic origo sesame 1 0 0 parts by weight
- Photopolymerization initiator Chipa Geigy Irgacure 1 8 4
- Solvent t-Butanol 90 parts by weight
- Cross-linkable styrene beads S B X 6 (manufactured by Sekisui Plastics Co., Ltd.) 6 parts by weight
- the average particle size of the timber styrene beads: S B X 6 is 5.9 zm.
- the film After coating, after drying for 2 minutes in a drying oven at 80 ° C, the film is adjusted to 40 ° C and cured by irradiation with ultraviolet rays at 300 mJ / cm2 to dry the film. An antiglare layer having a thickness of 8.9 ⁇ m was formed. As a result, the desired antiglare film was obtained.
- anti-glare properties were the same as in Example 1 except that the coating speed was 50 m / min and the dry film thickness of the anti-glare layer was 10.5 ⁇ m. A film was obtained.
- An antiglare film was obtained in the same manner as in Example 1 except that the dry film thickness of the antiglare layer was changed to 7.4 m by adjusting the number of gravure lines and coating conditions.
- An antiglare film was obtained in the same manner as in Example 1 except that the raw materials shown in the following coating composition were blended and the dry film thickness of the antiglare layer was changed to 7.3 ⁇ .
- Photopolymerization initiator (Irgacure made by Ciba Geigy 1 8 4) 3 parts by weight Solvent Methyl isobutyl ketone (M I B K) 1 5 0 parts by weight
- Silica beads S S 5 0 B (Tosohichi Silica Co., Ltd.) 1 2 parts by weight Dispersant DO PA 1 5 (Shin-Etsu Chemical Co., Ltd.) 10 parts by weight
- Silica beads S S 50 B has an average particle size of 1.5 ⁇ .
- the raw materials shown in the following paint composition were blended, stirred for 2 hours with a disper, and then filtered through a 20 m mesh to obtain a paint.
- the obtained paint was applied to one side of a 80 ⁇ m-thick TAC film (Fuji Photo Film Co., Ltd.) using a bar coater.
- Multifunctional acrylic origo sesame 1 0 0 parts by weight
- Photopolymerization initiator (Ciba Geigy Irgacure 1 84) 3 parts by weight Solvent t-Butanol 1 6 5 parts by weight
- Anti-glare film in the same manner as in Example 1 except that the raw materials shown in the following coating composition were blended, the dry wire thickness of the anti-glare layer was adjusted to 8.5 ⁇ by adjusting the number of Daravia wires and the peripheral speed ratio. Got.
- Photopolymerization initiator (Ciba Geigy Irgacure 1 8 4) 5 parts by weight Solvent Butyl acetate 6 5 parts by weight
- Acrylic polymer 10 parts by weight
- Silicone leveling agent 0.0 5 parts by weight
- Example 2 Using the paint prepared in Example 1, after filtering through a 20 ⁇ m mesh having a roughness of 3 times the average particle size, the thickness is 80! 11 Triacetyls The paint was dropped on one side of a loose (TAC) film (manufactured by Fuji Photo Film Co., Ltd.), allowed to stand for 1 minute, and after confirming that the fine particles had settled and the paint was separated, it was applied using a bar coater. Thereafter, an antiglare film having a dry film thickness of 13.9 ⁇ m was obtained in the same manner as in Example 1 except that the film temperature was controlled at 60 ° C.
- TAC loose
- an antiglare film having a dry film thickness of 13.9 ⁇ m was obtained in the same manner as in Example 1 except that the film temperature was controlled at 60 ° C.
- the ingredients shown in the following paint composition are blended, stirred for 2 hours with a disper, filtered through a 20 ⁇ m mesh with a roughness 3 times larger than the average particle size, and then a 80 ⁇ m thick trigger.
- the dry film thickness of the antiglare layer was the same as in Comparative Example 1 except that the paint was dropped on one side of an acetylcellulose (TAC) film (Fuji Photo Film Co., Ltd.) and applied immediately using a bar coater. An antiglare film with ⁇ was obtained.
- TAC acetylcellulose
- Photoinitiator (Ciba Geigy Irgacure 1 8 4) 3 parts by weight Solvent t-Butanol 1 6 5 parts by weight
- Cross-linkable styrene beads S B X 6 (manufactured by Sekisui Plastics Co., Ltd.) 6 parts by weight
- the average particle size of cross-linkable styrene beads S BX 6 is 5.9 // m.
- An antiglare film was obtained in the same manner as in Comparative Example 2, except that the dry film thickness of the antiglare layer was 9.3 ⁇ .
- An antiglare film was obtained in the same manner as in Comparative Example 2 except that the dry film thickness of the antiglare layer was set to 12.3 m.
- An antiglare film was obtained in the same manner as in Comparative Example 2 except that the dry film thickness of the antiglare layer was 15.0 m.
- Acrylic polymer 20 parts by weight
- Silicone leveling agent 0.0 5 parts by weight
- Crosslinkable MS beads (Techpolymer manufactured by Sekisui Plastics Co., Ltd., refractive index 1.5 5 1 5, average particle size 5.5 m, coefficient of variation 7) 2 5 parts by weight Examples 1 to 7 and comparison
- the dry film thicknesses of the antiglare layers in Examples 1 to 7 are measured using a thickness measuring device (manufactured by TE SA Corporation).
- each antiglare film produced was evaluated in order to evaluate the diffuse reflection characteristics of the antiglare film itself while suppressing the influence of back surface reflection.
- the back side of the sample is attached to black glass with an adhesive, and the specular reflection direction is set to 0 using an optech gonioff otometer GP-1-13D with an incident angle of 5 ° on the sample.
- the reflection intensity was measured every 0.2 ° in the range of ⁇ 5 ° to 30 ° to obtain diffuse reflection characteristics.
- the differential d ⁇ L og (I (h)) ⁇ Zd ⁇ of the logarithmic reflection intensity L og (I (a)) was found to be the angle ⁇ 1 at which the extreme value was shown.
- L og (I (a 0))-1 L og (I (1 1)) was obtained, where ⁇ 0 is the angle at which the reflection intensity is maximum. The results are shown in Table 1.
- Fluorescent lamp can be recognized to some extent, but the outline is blurred
- the comb width was 2 mm and 1 mm in accordance with JIS-K 7 10 5
- the clarity of the transmitted image was evaluated using optical combs of 0.5 mm, 0.25 mm, and 0.125 mm.
- the measuring device used for the evaluation was a Suga Test Instruments Co., Ltd. image clarity measuring instrument (ICM-1T type).
- Table 1 shows the value C (2.0) for the comb width 2 mm, the value C (2.0) for the comb width 2 mm, and the value C (0.1 for the comb width 0.1 2
- the ratio C (0. 1 2 5) / C (2.0) with 2 5) is shown.
- the sum of transmitted image sharpness measured using optical combs with a comb width of 2 mm, 1 mm, 0.5 mm, 0.25 mm, and 0.125 mm is defined as image sharpness. Show.
- FIG. 15 shows the measurement results of the diffuse reflection characteristics of the antiglare films of Example 2, Example 4, and Example 5.
- the antiglare films of Example 2, Example 4, and Example 5 show the same characteristics as the diffuse reflection characteristics shown in FIG.
- the differential d ⁇ Log (I ( ⁇ )) ⁇ / da of (I (a)) confirmed the angle ⁇ 1 indicating the extreme value.
- FIG. 16 shows the measurement results of the diffuse reflection characteristics of the antiglare films of Example 7 and Comparative Example 7. In Example 7, the same characteristics as the diffuse reflection characteristic shown in Fig.
- the amount of the polymer is 20 parts by weight, and the polymer has a higher molecular weight than the monomer or oligomer, so that it is difficult for the leveling to proceed and the meniscus between the particles tends to be intermittently formed. Hateful. Thus, it is necessary to control the repelling property by preparing the resin composition, and to form the antiglare film so that the low angle component and the wide angle component are mixed. In addition, it is important to control the resin composition and the temperature at the time of curing because the same resin can be leveled by controlling the temperature at the time of curing to a high level.
- the amount of polymer added is preferably 0 to 15 parts by weight with respect to 100 parts by weight of the total resin. More preferably, it is 3 parts by weight or more and 10 parts by weight or less. If the amount of polymer added is large, leveling is difficult to proceed. It is necessary to
- FIG. 18 shows the measurement results of transmitted image clarity of the antiglare films of Examples 2 to 5 and Comparative Examples 1 to 5. As shown in FIG. 18, it can be seen that in Example 2 to Example 5, compared to Comparative Example 1 to Comparative Example 5, the transmitted map clarity does not change significantly even if the comb width is reduced.
- Table 1 shows the following.
- Each of the anti-glare films of Examples 1 to 5 has an angle ⁇ ; 1, and its diffuse reflection characteristic is a characteristic in which a low-angle reflection component and a wide-angle diffusion reflection component are mixed. It was possible to achieve both glare and clear transmitted image clarity.
- the anti-glare films of Comparative Examples 2 to 6 showed the same characteristics as the diffuse reflection characteristics shown in FIG. 5 and seemed to contain both low-angle and wide-angle diffuse reflection components. It was not a diffuse reflection characteristic.
- the antiglare film shown in Comparative Example 1 showed diffuse reflection characteristics similar to Example 1, but when this antiglare film was actually applied to the surface of an image display device and observed, The edge of the reflection was visible and felt anti-glare. This is thought to be because specularly reflected light in a flat shape was felt strongly even when viewed from a distance, because the average unevenness distance was greater than 300 ⁇ m.
- Example 4 when a fine image with a fine pitch was displayed and the image was observed, for example, when comparing Example 4 that seems to have the same degree of anti-glare property and Comparative Example 5, it is clear that Example 4 However, the contrast was high and a clear image was obtained. Further, when Example 2 and Comparative Example 5 were compared side by side, the image itself looked high and clear, although Example 2 felt higher antiglare properties against external light.
- the antiglare films shown in Comparative Examples 1 to 5 have a low ratio of transmitted image clarity C (0.1 2 5) / C (2.0) of 0.1 or less,
- the antiglare films shown in Examples 1 to 5 have a value of 0.1 or more. Yes, the highest was over 0.6.
- the ratio C (0. 1 2 5) / C (2. 0) of the transmitted map definition is as high as 0.3, but the diffuse reflection characteristics are reduced so far with the conventional anti-glare film technology. It was found that the anti-glare property was hardly obtained and the edge of the reflected image was visually recognized.
- Example 3 When these antiglare films were actually applied to an image display device and a fine image was observed, for example, when comparing Example 3 and Comparative Example 4 side by side, Example 3 was more antiglare against external light. Despite feeling high, the contrast of the image itself was high and clear.
- the value C (2.0) of the comb width 2 mm of Example 3 is 60.5
- the value C (2.0) of the comb width 2 mm of Comparative Example 4 is 76.3.
- Comparative Example 4 has a higher contrast, but when an image with the same fineness is observed, Example 3 has a higher contrast.
- the value C (2.0) of the comb width 2 mm but also the value of the ratio C (0.1 2 5) / C (2.0) of the transmitted map sharpness is important. I understood.
- the diffuse reflection characteristic shows a characteristic in which a low-angle reflection component and a wide-angle diffusion reflection component are mixed, and the antiglare film has an average interval of fine irregularities on the surface of 300 ⁇ m or less.
- the value C (2.0) of the antiglare film with a comb width of 2 mm is set to 30% or more, and the ratio C (0.125) / C (0.2) of the transmitted map sharpness is set to It was found that by setting the ratio to 0.1 or more, both the clearness of the transmitted image and the antiglare property can be achieved.
- Example 1 the low-angle reflection part and the wide-angle diffuse reflection part on the surface of the antiglare layer can be obtained by appropriately leveling the resin shape between the particles by adjusting the film temperature during curing to 40 ° C.
- the antiglare films having different angles ee l were obtained.
- reflection was evaluated in the same manner as in the evaluation of antiglare performed in Example 1. The presence or absence of reflection was evaluated according to the following criteria.
- Fig. 19 shows each of Examples 6 to 30 with the angle ⁇ 1 on the horizontal axis and the logarithmic intensity difference L og (I ( ⁇ 0))-L og (I (a 1)) on the vertical axis. It is the graph which displayed the result of reflection evaluation of an anti-glare film.
- the mark “ ⁇ J” in Figure 19 indicates that the reflection is not noticeable, and the mark “X” indicates that the reflection is visible.
- the mark “ ⁇ ” and the mark “X” could be distinguished by the straight line i.
- the anti-glare film has a relationship between the declination ⁇ and the logarithmic intensity difference L og (I (a 0))-L og (I (a 1)) satisfying the following equation (1). It was found that the reflection in the can be further reduced.
- the present invention provides plasma displays, organic EL displays, inorganic EL displays Display, CRT display, rear projection display, surface conduction electron-emitting device display, field emission display (FED), LED display, rear projection display (laser TV) using laser as light source, etc. It can be applied to various display devices. '
- the mother die may be produced by a pressing method, a method using a molding stamper, a cutting method, or a plast method.
- an antiglare film having a plurality of layers such as a low refractive index layer having a refractive index lower than that of the antiglare layer 12, may be provided on the antiglare layer 12.
- a material constituting the low refractive index layer for example, a photosensitive resin containing fluorine (F) can be used.
Abstract
Description
Claims
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JP2009520642A JPWO2009001911A1 (ja) | 2007-06-28 | 2008-06-20 | 光学フィルムおよびその製造方法、並びにそれを用いた防眩性偏光子および表示装置 |
CN2008800015404A CN101578538B (zh) | 2007-06-28 | 2008-06-20 | 光学膜、其制备方法、使用该光学膜的防眩偏光器以及显示装置 |
EP08777645A EP2161596A4 (en) | 2007-06-28 | 2008-06-20 | OPTICAL FILM AND METHOD OF MANUFACTURING THEREFOR, AND BLURRY-FREE POLARIZER THEREFOR AND DISPLAY DEVICE |
US12/520,946 US8325418B2 (en) | 2007-06-28 | 2008-06-20 | Optical film, its manufacturing method, anti-glare polarizer using the same, and display apparatus |
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US20100129661A1 (en) * | 2008-11-24 | 2010-05-27 | Samsung Electronics Co., Ltd. | Coating compound for portable electronic apparatus and coating method for the portable electronic apparatus |
JP2010237338A (ja) * | 2009-03-30 | 2010-10-21 | Fujifilm Corp | 透過性基材及びその製造方法、光学フィルム、偏光板、並びに画像表示装置 |
US8325296B2 (en) | 2009-03-30 | 2012-12-04 | Fujifilm Corporation | Light-transmitting substrate, optical film, polarizing plate and image display device |
JP2011128607A (ja) * | 2009-11-18 | 2011-06-30 | Keiwa Inc | 光学シート及びこれを用いたバックライトユニット |
JP2012203323A (ja) * | 2011-03-28 | 2012-10-22 | Lintec Corp | ニュートンリング防止シート |
JP2020095092A (ja) * | 2018-12-10 | 2020-06-18 | 大日本印刷株式会社 | 光学積層体、該光学積層体の製造方法、積層部材及び表示装置 |
JP7326734B2 (ja) | 2018-12-10 | 2023-08-16 | 大日本印刷株式会社 | 光学積層体、該光学積層体の製造方法、積層部材及び表示装置 |
Also Published As
Publication number | Publication date |
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KR20100031093A (ko) | 2010-03-19 |
TWI449964B (zh) | 2014-08-21 |
CN101578538B (zh) | 2011-11-16 |
JPWO2009001911A1 (ja) | 2010-08-26 |
US8325418B2 (en) | 2012-12-04 |
TW200916836A (en) | 2009-04-16 |
EP2161596A1 (en) | 2010-03-10 |
CN101578538A (zh) | 2009-11-11 |
US20090310219A1 (en) | 2009-12-17 |
EP2161596A4 (en) | 2011-10-12 |
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