WO2008136535A1 - 防眩フィルム、防眩性偏光板及び画像表示装置 - Google Patents
防眩フィルム、防眩性偏光板及び画像表示装置 Download PDFInfo
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- WO2008136535A1 WO2008136535A1 PCT/JP2008/058592 JP2008058592W WO2008136535A1 WO 2008136535 A1 WO2008136535 A1 WO 2008136535A1 JP 2008058592 W JP2008058592 W JP 2008058592W WO 2008136535 A1 WO2008136535 A1 WO 2008136535A1
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- film
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- glare
- antiglare film
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- 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
-
- 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
-
- 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
- G02B5/0221—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 the surface having an irregular structure
-
- 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
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
-
- 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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- 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
- G02F1/133502—Antiglare, refractive index matching layers
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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
- G02F1/133528—Polarisers
Definitions
- the present invention relates to an antiglare film having a low haze while exhibiting excellent antiglare performance, and an image display device provided with the antiglare film.
- the present invention is an anti-glare film that exhibits excellent anti-glare performance and does not become whitish, exhibits high contrast without causing glare, and provides good visibility when applied to an image display device.
- the present invention relates to an antiglare polarizing plate and an image display device provided with the antiglare film.
- image display devices such as liquid crystal displays, plasma display panels, cathode ray tube (CRT) displays, and organic electroluminescence (EL) displays is significantly impaired when external light is reflected on the display surface.
- display is made using a television or personal computer that emphasizes image quality, a video power camera that is used outdoors with strong external light, a digital power camera, and reflected light.
- a film layer for preventing external light from being reflected has been provided on the surface of an image display device.
- This film layer consists of a film that has been anti-reflective treated using interference from the optical multilayer film, and an anti-glare treatment that blurs the reflected image by scattering incident light by forming fine irregularities on the surface. It is divided roughly into the thing which consists of the film which was given. Of these, the former non-reflective film requires a multilayer film having a uniform optical film thickness, which increases the cost. On the other hand, the latter antiglare film can be manufactured at a relatively low cost, and is therefore widely used in applications such as large personal computers and monitors.
- such an antiglare film has, for example, a resin solution in which a filler is dispersed. It is manufactured by a method of forming random irregularities on a sheet by applying the liquid on a base sheet, adjusting the coating film thickness, and exposing the filler to the surface of the coating film.
- the antiglare film produced by dispersing such fillers is affected by the arrangement and shape of irregularities depending on the dispersion state and application state of the filler in the resin solution. It was difficult to obtain unevenness, and sufficient anti-glare performance could not be obtained with a low haze.
- a conventional anti-glare film is arranged on the surface of the image display device, the entire display surface becomes whitish due to scattered light, and the display becomes cloudy, so-called white tinge tends to occur. There was this.
- the pixel of the image display device and the uneven surface shape of the anti-glare film interfere with each other, resulting in a so-called glare phenomenon in which a luminance distribution occurs and is difficult to see. It was easy to occur.
- glare there is an attempt to scatter light by providing a refractive index difference between the binder resin and the dispersion filler.
- the light is scattered.
- the brightness of the black display increased by the tongue light, and as a result, the contrast wrinkles decreased and the visibility was significantly reduced.
- Patent Document 1 discloses that an ionizing radiation curable resin is cured with an ionizing radiation curable resin sandwiched between an embossed mold and a transparent resin film. Three-dimensional 10-point average roughness and the average distance between adjacent projections on the three-dimensional roughness reference surface form fine irregularities that satisfy predetermined values, respectively.
- An antiglare film having a radiation curable resin layer provided on the transparent resin film is disclosed.
- an uneven surface for embossing is formed by a sandblasting method or a bead shot method, preferably using a roller chrome-plated on the surface of iron. Furthermore, in order to improve durability during use, the mold surface with such irregularities should be used after applying chrome plating. There is also a statement that it is possible to achieve hardening and corrosion prevention. In such an embossing roll manufacturing method, a blast shot is performed on a hard chrome plating, so that it is difficult to form unevenness, and it is difficult to precisely control the shape of the formed unevenness. . Further, as described in Japanese Patent Application Laid-Open No.
- Patent Document 2 the chrome plating is formed by blasting whose surface is often rough depending on the material and shape of the base. Since fine cracks caused by chrome plating are formed on the unevenness, it was difficult to design what unevenness was created. Furthermore, since there are fine cracks caused by chrome plating, the scattering characteristics of the finally obtained antiglare film may change in an unfavorable direction.
- Patent Document 3 JP 2004-29240 A
- Patent Document 4 JP 2004-90187 A
- the former document discloses a method for producing an embossing roll by the bead shot method
- the latter document describes a process of forming a metal plating layer on the surface of the embossing roll, and the surface of the metal plating layer.
- a method for producing an embossing roll through a step of mirror polishing, a step of blasting a mirror-polished metal plating layer surface using ceramic beads, and a step of pinning as necessary. Yes.
- Patent Document 5 Japanese Patent Application Laid-Open No. 2006-53371 relating to the application of the present applicant describes that a fine surface is applied to a polished metal surface to form irregularities, and an electroless nickel plating is applied thereto. It has been disclosed that an antiglare film having excellent antiglare performance while having low haze is obtained by forming a mold and transferring the uneven surface of the mold onto a transparent resin film. Furthermore, as a document defining the transmitted scattered light intensity of the antiglare film,
- Patent Document 6 Japanese Patent Laid-Open No. 2003-248101 (Patent Document 6) and Japanese Patent Laid-Open No. 2004-126495 (Patent Document 7) are available.
- a film having an antiglare hard coat layer on a transparent support in which light is incident from the transparent support side and is inclined by 5 ° with respect to the amount of light (Io) traveling straight through the transmitted light. and the proportion of the light amount (1 5) being scattered (1 5 Z 10) of 3.5% or more, the proportion of the amount of light scattered in 20 ° direction inclined with respect to I Q (I 2 o) ( I 20/1 0 ) Is 0.1% or less, an antiglare antireflection film is disclosed.
- the latter document discloses an antiglare film having a scattering angle showing a maximum value of scattered light intensity of 0.1 to 10 ° and a total light transmittance of 70 to 100%. Even with the antiglare films disclosed in these documents, it was difficult to maintain high contrast, particularly when applied to high-definition image display devices.
- the present invention exhibits excellent anti-glare performance, prevents deterioration of visibility due to whitening, and exhibits high contrast without causing glare when placed on the surface of a high-definition image display device.
- Another object of the present invention is to provide an antiglare film and an image display device to which the antiglare film is applied.
- an antiglare film in which an antiglare layer having a fine uneven surface is formed on a transparent support, and an incident angle of 20 from the transparent support side.
- Anti-glare layer when the relative scattered light intensity T (20) in the normal direction of the anti-glare layer when light is incident at a specific angle shows a specific value and light is incident at an incident angle of 30 ° from the transparent support side If the relative scattered light intensity T (30) in the side normal direction is set to a specific value, glare is sufficiently prevented and contrast is hardly reduced when applied to an image display device. I found it.
- the antiglare film according to the present invention has an antiglare layer having a fine uneven surface formed on a transparent support, and the antiglare layer when light is incident at an incident angle of 20 ° from the transparent support side.
- Relative scattered light intensity T (20) in the side normal direction is 0.0001% or more 0.
- the relative scattered light intensity ⁇ ⁇ ⁇ ⁇ (30) in the normal direction of the glare-proof layer side when light is incident at an incident angle of 30 ° from the transparent support side is 0.00004% or more 0.0
- the reflectance R (30) at a reflection angle of 30 ° is 0.05% or more and 2% or less, and the reflection angle is 40 °.
- the reflectance R (40) is preferably 0.0001% or more and 0.005% or less
- the reflectance R (50) at a reflection angle of 50 ° is preferably 0.00001% or more and 0.0005% or less.
- the surface haze is 0.1% or more and 5% or less and the total haze is 5% or more and 25% or less when light is vertically incident on the antiglare film.
- This anti-glare film has dark and light widths of 0.5mm, 1.0mm and 2.0mm
- the sum of reflection sharpness measured at a light incident angle of 45 ° can be reduced to 40% or less.
- the antiglare film has an arithmetic average height Pa of 0.05 xm or more and 0.2 or less in a cross-sectional curve of the uneven surface constituting the antiglare layer, and a maximum cross section height Pt of 0.2 / m or more and 1 m or less,
- the average length P Sm is preferably 15 / m or more and 30 or less.
- the antiglare layer in this antiglare film is preferably formed with surface irregularities by transfer from a mold having an irregular surface.
- the antiglare layer has an average particle diameter of 5 zm or more and 15 m or less with respect to 100 parts by weight of the binder resin, and a difference in refractive index from the binder resin of 0.01 or more and 0.06 or less.
- the fine particles are preferably contained in an amount of 10 to 100 parts by weight, and further, the fine particles are completely embedded in the antiglare layer, and the fine particles do not affect the concave and convex shape of the surface. Is preferred.
- a low reflection film can be formed on the uneven surface of the antiglare layer.
- the antiglare film of the present invention can be made into an antiglare polarizing plate in combination with a polarizer comprising a polyvinyl alcohol resin.
- the antiglare polarizing plate has a structure in which the transparent support side of the antiglare film is bonded to a polarizer.
- an image display device includes the antiglare film or the antiglare polarizing plate and the image display means, and the antiglare film or the antiglare polarizing plate is disposed on the viewing side of the image display element.
- Fig. 1 Schematic representation of the incident light direction and transmitted scattered light intensity measurement direction when light is incident from the transparent support side of the antiglare film and the scattered light intensity observed in the normal direction of the antiglare layer side is obtained. It is a perspective view shown in FIG.
- Fig. 2 An example of a graph plotting the relative scattered light intensity (logarithmic scale) measured with different incident angles against the incident angle.
- Fig. 3 is a perspective view schematically showing the incident direction and reflection direction of light from the antiglare layer side when the reflectance is obtained.
- FIG. 4 is an example of a graph plotting the reflection angle and reflectance (reflectance is a logarithmic scale) for light incident at an angle of 30 ° from the normal of the antiglare film.
- FIG. 5 is a perspective view schematically showing an algorithm for determining a convex portion of an antiglare film.
- Fig. 6 A Polonoi diagram showing an example of the Polonoi partition.
- FIG. 7 is a schematic cross-sectional view showing a method for producing a mold for producing an antiglare film according to the present invention for each step.
- FIG. 8 is a schematic cross-sectional view showing a state where the surface is polished after chromium plating.
- FIG. 9 is a plan view showing a unit cell of a glare evaluation pattern.
- FIG. 10 is a schematic cross-sectional view showing a state of glare evaluation.
- FIG. 1 1 is a graph showing transmission / scattering profiles of antiglare films obtained in Examples 1 to 4.
- FIG. 12 is a graph showing the reflection profile of the antiglare film obtained in Examples 1 to 4.
- FIG. 1 3 is a graph showing the transmission / scattering profile of the antiglare film obtained in Comparative Examples 1 and 2.
- FIG. 14 is a graph showing the reflection profile of the antiglare film obtained in Comparative Examples 1 and 2.
- FIG. 15 is a graph showing the transmission / scattering profile of the antiglare film obtained in Comparative Examples 3-5.
- Fig. 16 is a graph showing the reflection profile of the antiglare film obtained in Comparative Examples 3 to 5.
- FIG. 17 is a graph showing the transmission scattering profile of the antiglare film used in Comparative Examples 6-9.
- 3 6 a Surface with irregularities formed by hitting fine particles blunted by etching
- 3 6 b Surface with irregularities formed by hitting fine particles blunted by copper plating
- the antiglare film of the present invention has an antiglare layer having a fine uneven surface formed on a transparent support, and is antiglare when light is incident at an incident angle of 20 ° from the transparent support side.
- Relative scattered light intensity T (20) observed in the layer normal direction shows a value of 0.0001% or more and 0.0005% or less, and the antiglare layer method is used when light is incident at an incident angle of 30 ° from the transparent support side.
- the relative scattered light intensity T (30) observed in the line direction shows a value of 0.00004% or more and 0.00025% or less.
- the reflectance R (30 ) Is 0.05% or more and 2% or less, and the reflectance R (40) at a reflection angle of 40 ° is
- the reflectance R (50) at a reflection angle of 50 ° is preferably 0.00001% or more and 0.0005% or less.
- Figure 1 shows the incident light direction and transmitted scattering when light is incident from the transparent support side (opposite to the uneven surface) and the anti-glare layer side (uneven surface side) is measured for the scattered light intensity in the normal direction. It is the perspective view which showed the light intensity measurement direction typically.
- light 13 incident at an angle ⁇ (incident angle) from normal 12 on the transparent support side of antiglare film 11 is transmitted in normal direction 12 on the antiglare layer side.
- the intensity of the scattered light 1 is measured, and the value obtained by dividing the transmitted scattered light intensity by the light intensity of the light source is defined as the relative scattered light intensity ⁇ ( ⁇ ).
- the intensity of the emitted light 14 observed in the normal direction 12 on the antiglare layer side is set to the light of the light source.
- the value divided by intensity is ⁇ (20)
- the incident light 13 is incident on the transparent support side of the antiglare film 1 1 at an angle of 30 to 30 ° from the normal line, the normal direction of the antiglare layer side
- the value obtained by dividing the intensity of the outgoing light 14 observed in 12 by the light intensity of the light source is ⁇ (30).
- the relative scattered light intensity ⁇ (30) at 30 ° incidence is less than 0.00004%, the scattering effect is low, and glare occurs when applied to a high-precision image display device. Absent.
- anti-glare film is applied to liquid crystal displays that are not self-luminous, the effect of increasing the brightness due to scattering caused by light leakage during black display is significant, so the relative scattered light intensity ⁇ (20) and ⁇ (30) If it exceeds the provisions of the present invention, the contrast will be significantly reduced and the visibility will be impaired.
- Patent Document 6 Japanese Patent Laid-Open No. 2003-248101
- Patent Document 7 Japanese Patent Laid-Open No. 2004-126495
- Fig. 2 is an example of a graph in which the relative scattered light intensity (logarithmic scale) measured by changing the incident angle ⁇ from the transparent support side of the antiglare film 11 in Fig. 1 is plotted against the incident angle ⁇ .
- Such a graph representing the relationship between the incident angle and the relative scattered light intensity, or the relative scattered light intensity for each incident angle read from the graph is sometimes referred to as a transmission scattering profile.
- the relative scattered light intensity shows a peak at an incident angle of 0 °, and the scattered light intensity tends to decrease as the angle from the normal direction of the incident light 13 deviates.
- the incident angles plus (+) and minus (-) are determined by the inclination of the incident light in the plane 19 including the incident light direction 13 and the normal 12 with the normal direction (0 °) as the center. Is. Therefore, the transmission / scattering profile usually appears symmetrically around the incident angle of 0 °.
- the relative scattered light intensity T (0) at 0 ° incidence shows a peak at about 30%
- the relative scattered light intensity T (20) at 20 ° incidence is about
- the relative scattered light intensity T (30) at 0.0002%, 30 ° incidence is about 0.00004%.
- a detector In measuring the relative scattered light intensity of the antiglare film, it is necessary to accurately measure the relative scattered light intensity of 0.001% or less. Therefore, it is effective to use a detector with a wide dynamic range.
- a detector for example, a commercially available optical power meter can be used, and an aperture is provided in front of the optical power meter detector so that the angle at which the anti-glare film is viewed is 2 °. Measurement can be performed using the goniophotometer.
- Visible light of 380 to 780 nm can be used as incident light, and a collimated light emitted from a light source such as a halogen lamp may be used as a measurement light source, or a monochromatic light source such as a laser is used in parallel. You may use a thing with a high degree.
- an optically transparent adhesive is used so that the uneven surface becomes the surface. It is preferable to use for a measurement after bonding to a glass substrate. [Reflectance at 30 ° incidence]
- FIG. 3 is a perspective view schematically showing the incident direction and the reflection direction of light from the antiglare layer side with respect to the antiglare film when the reflectance is obtained.
- the incident light 15 incident on the antiglare layer side of the antiglare film 11 at an angle of 30 ° from the normal 12 is reflected in the direction of the reflection angle 30 °, that is, in the regular reflection direction 16.
- R (30) be the reflectance of light (that is, the regular reflectance).
- the reflected light at an arbitrary reflection angle ⁇ is denoted by reference numeral 17, and the direction 16 and 17 of the reflected light when measuring the reflectance is within the plane 19 including the direction 15 of the incident light and the normal 12.
- R (40) be the reflectance in the direction of the reflection angle 40 °
- R (50) be the reflectance in the direction of the reflection angle 50 °.
- the reflectance in the direction of the reflection angle of 30 ° that is, the regular reflectance R (30) is 0.05% or more and 2% or less with respect to the incident light having the incident angle of 30 °. Is preferred.
- reflectivity R (40) in the direction of the reflection angle 40 ° should be 0.0001% or more and 0.005% or less
- reflectivity R (50) in the direction of the reflection angle 50 ° should be 0.00001% or more and 0.0005% or less. preferable.
- the regular reflectance R (30) exceeds 2%, sufficient anti-glare function cannot be obtained and visibility is deteriorated. On the other hand, even if the regular reflectance R (30) is too small, it tends to cause whitishness, so it is preferably 0.05% or more.
- the regular reflectance R (30) is more preferably 1.5% or less, particularly 0.7% or less.
- R (40) exceeds 0.005% or R (50) exceeds 0.0005% the anti-glare film will be whitish and visibility will be reduced. . That is, for example, even when black is displayed on the display surface with an anti-glare film installed on the forefront of the display device, white burn may occur that picks up light from the surroundings and makes the display surface entirely white.
- R (40) and R (50) do not become too large.
- R (40) is generally preferably 0.000% or more
- R (5 0) is generally 0.000 0 1 because sufficient anti-glare properties are not exhibited even if the reflectance is too small. % Or more is preferable.
- R (50) is more preferably 0.0001% or less.
- Figure 4 shows the reflection angle and reflectance of the reflected light 17 with respect to the incident light 15 incident on the antiglare layer side of the antiglare film 11 in FIG. 3 at an angle of 12 to 30 ° normal (the reflectance is a logarithmic scale). It is an example of the graph which plotted. Such a graph representing the relationship between the reflection angle and the reflectance, or the reflectance for each reflection angle read from the graph is sometimes referred to as a reflection profile.
- the regular reflectance R (30) is the peak of the reflectance with respect to the incident light 15 incident at 30 °, and the reflectance tends to decrease as the angle deviates from the regular reflection direction.
- the specular reflectance R (30) is about 0.2%
- R (40) is about 0.0004%
- R (50) is about 0.00005%.
- the antiglare films currently on the market are of a type in which a filler is dispersed, and when such an antiglare film is irradiated at 20 °,
- the relative scattered light intensity T (20) was 0.0001% or more and 0.0005% or less
- the relative scattered light intensity T (30) at 30 ° incidence was 0.00004% or more and 0.00025% or less.
- regular reflectance R (30) is 0.05% or more and 2% or less
- reflectance R (40) at a reflection angle of 40 ° is 0.000 1% or more and 0.005% or less
- reflection angle 50 None of the films had a reflectivity R (50) at a temperature of 0.00001% or more and 0.0005% or less.
- the anti-glare film defined in the present invention is excellent in that whitishness is suppressed while exhibiting sufficient anti-glare performance.
- incident light visible light of 3 80 to 78 8 Orn can be used, and as a measurement light source, a collimated light emitted from a light source such as a halogen lamp may be used, A monochromatic light source such as a laser with high parallelism may be used.
- a measurement light source a collimated light emitted from a light source such as a halogen lamp may be used, A monochromatic light source such as a laser with high parallelism may be used.
- reflection from the back surface of the antiglare film may affect the measured value.
- the smooth surface of the antiglare film is adhered to a black acrylic resin plate with an adhesive or It is preferable that only the reflectance of the outermost surface of the antiglare film can be measured by optically adhering using a liquid such as water glycerin.
- the antiglare film of the present invention has a surface haze with respect to perpendicular incident light of 0.1 in order to prevent white blurring and effectively suppress glare when applied to a high-definition image display device. It is preferable that the total haze is 5% or more and 25% or less.
- the total haze of the antiglare film can be measured according to the method shown in J IS K 7136. The surface haze and internal haze can be separated by measuring the overall haze, pasting a transparent film with almost 0 haze on the uneven surface, measuring the internal haze, and calculating the surface haze using the following formula: .
- the haze value measured with a transparent film with a haze of approximately 0 applied to the uneven surface of the antiglare film is almost completely countered by the surface haze caused by the original unevenness. You can think of it as effectively representing internal haze.
- the transparent film having almost no haze is not particularly limited as long as the haze is small. For example, triacetyl cell Use a loin film.
- the surface haze is more than 5%, there is a strong tendency for whitening, and if it is less than 0.1%, sufficient antiglare property is not exhibited. Further, the total haze is preferably 5% or more in order to effectively eliminate glare. However, if the total haze exceeds 25%, the screen becomes dark as a result when applied to an image display device, which is not preferable.
- the antiglare film of the present invention also has a sum of reflection sharpness measured at a light incident angle of 45 ° using three types of optical combs having a dark portion and a bright portion width of 0.5 mm, 1.0 thigh, and 2.0 mm. It is preferably 40% or less. Reflection sharpness is measured by the method specified in JIS K 7105. In this standard, four types of optical combs are used to measure image clarity: the ratio of the width of the dark area to the bright area is 1: 1, and the width is 0.125, 0.5, 1.0, and 2.0. Is stipulated.
- the measurement error when using an optical comb with a ⁇ ⁇ 0.125 mm is large because the measured value error becomes large in the antiglare film specified in the present invention.
- the value shall not be added to the sum, and the sum of the image sharpness measured using three types of optical combs with a width of 0.5 mm, 1.0 thigh and 2.0 thigh will be referred to as reflection sharpness.
- the maximum reflection sharpness for this definition is 300%. If the definition of the reflection definition exceeds 40%, an image of a light source or the like is clearly reflected, which is not preferable because of poor antiglare property.
- the reflection sharpness of each of the optical combs with widths of 0.5 thigh, 1.0 thigh and 2.0 mm is at most about 10%, and the fluctuation of the reflection sharpness due to measurement error cannot be ignored. Because.
- the anti-glare film having a reflection definition of 40% or less is used, and the relative scattering light is applied.
- the strength, and preferably combining it with the reflectance at 30 ° incidence it is used as an index that can suitably evaluate the antiglare performance of the antiglare film.
- the anti-glare film of the present invention more effectively suppresses glare, and makes the texture when observed visually uniform and uniform. Preferably satisfies a plurality of requirements.
- the arithmetic average height Pa is not less than 0.05 m and not more than 0.20 m, and the maximum section height Pt is not less than 0.2 zm 1. 0 m or less, average length P Sm is 15 m or more and 30 m or less, (2) 50 or more uneven surfaces constituting the antiglare layer are in the region of 2 0 0 umX 20 0 1 0 Having 0 or less protrusions,
- the average area of the polygon formed when the surface of the concavo-convex surface constituting the antiglare layer is divided into polonoy with the top of the convex portion as the base point is 10 0 ⁇ 2 or more and 1,0 0 m 2 or less Be.
- the arithmetic average height Pa in the cross-sectional curve of the concavo-convex surface is less than 0.05 m, it is not preferable because the surface of the antiglare film becomes almost flat and does not exhibit sufficient antiglare performance.
- the arithmetic average height Pa is greater than 0.2 / im, the surface shape becomes rough, white discoloration occurs, and the texture when the appearance is visually observed becomes rough. After all it is not preferable.
- the maximum cross-sectional height Pt in the cross-sectional curve of the uneven surface is less than 0.2 m, the antiglare film surface is still almost flat, 2
- the surface shape becomes too rough, which causes problems such as whitishness and deterioration in texture, which is not preferable.
- the average length PSm in the cross-sectional curve of the uneven surface is less than 15 m, it is not preferable because sufficient antiglare property cannot be obtained. This is probably because if the average length P Sm is too small, the uneven peaks (the surface inclination angle is considered to be almost 0 °) are close to each other, so that an image is formed when visually observed. .
- the average length PSm is larger than 20 111, the texture when the appearance is visually observed becomes rough.
- the arithmetic average height Pa, maximum cross section height Pt, and average length PSm in the cross-section curve of the uneven surface can be measured using a commercially available general contact surface roughness meter in accordance with ⁇ IS B 0601. it can. It is also possible to measure the surface shape with a device such as a confocal microscope, interference microscope, or atomic force microscope (AFM), and calculate the three-dimensional information of the surface shape. When calculating from 3D information, in order to ensure a sufficient reference length, measure at least 3 points over 200 m x 200 m and use the average value as the measured value. Is preferred. Next, the number of protrusions observed on the uneven surface will be described.
- the uneven surface has 50 or more and 100 or less protrusions in an area of 200 m ⁇ 200 m.
- the surface shape is measured with a device such as a confocal microscope, a Chiken microscope, or an atomic force microscope (AFM).
- a device such as a confocal microscope, a Chiken microscope, or an atomic force microscope (AFM).
- the convex part is judged by the algorithm shown below, and the number is counted. That is, antiglare film surface
- the point is assumed to be the vertex of the convex part, and the number of convex parts obtained in this way is counted to obtain the number of convex parts.
- the radius of the circle 24 is required to be a size that does not count fine irregularities on the sample surface and does not include a plurality of convex portions, and is preferably about 3 ⁇ m.
- a magnification of the objective lens of about 50 times and a reduced resolution. This is because when measuring at high resolution, fine irregularities on the surface of the sample are measured, which hinders counting of the irregularities.
- the resolution in the height direction also decreases, so it may be difficult to measure the surface shape of a sample with few irregularities.
- a high pass frequency filter is applied to the obtained data to remove high spatial frequency components, and the fine roughness observed on the uneven surface cannot be seen. After that, the number of convex portions may be counted.
- Polonoi 7 is a region formed by the Polonoi division, which is called a Polonoy region or a Polonoi polygon, and is hereinafter referred to as a Poronoi polygon.
- the peripherally painted portions 2 8 and 2 8 will be described later.
- the number of generating points coincides with the number of Polonoi regions.
- the average area of the polony polygons formed when the polony division is performed with the vertex of the convex portion as a base point is 1 0 0 111 2 or more and 1, 0 0 0 m 2 or less. If the average area at this time is less than 100 m 2 , the inclination angle of the surface of the antiglare film becomes steep, and as a result, it is easy to generate a whitish color. On the other hand, when the average area of the Poronoi polygon is larger than 1,00 m 2 , the uneven surface shape becomes rough, glare is likely to occur, and the texture is deteriorated.
- FIG. 6 is a Polonoi diagram showing an example when the Polonoi division is performed with the convex vertex of the antiglare film as a base point.
- a large number of generating points 2 6 and 26 are the vertices of the convex portion of the antiglare film, and one Voronoi polygon 2 7 is assigned to one generating point 2 6 by Voronoi division.
- Polonoy polygons 28 and 28 that touch the boundary of the field of view and are thinly painted are not counted in the calculation of the average area, as described above.
- only some of the generating points and Poronoi polygons are attached with leading lines and symbols, but the fact that there are a large number of generating points and Polonoi polygons is explained above. It will be easily understood from the figure.
- the antiglare film of the present invention is formed by forming an antiglare layer having a fine uneven surface on a transparent support.
- the transparent support supports the antiglare layer having an uneven surface and can be composed of a substantially optically transparent resin film.
- transparent supports include solvents composed of thermoplastic resins such as triacetyl cellulose, polyethylene terephthalate, polymethyl methacrylate, polystreptonate, and norbornene-based amorphous cyclic polyolefin. Examples thereof include cast film and extruded film.
- the antiglare layer is formed on the transparent support as a layer provided with surface irregularities that satisfy the transmission scattering characteristics as described above.
- This anti-glare layer is applied randomly by applying a resin solution in which a filler, which has been widely used, is dispersed on a transparent support, and adjusting the coating film thickness to expose the filler on the coating film surface.
- the irregularities on the surface of the antiglare layer are preferably formed by transfer from a mold having an irregular surface.
- the antiglare layer has an average particle diameter of 5 m or more and 15 m or less and a refractive index difference with the binder resin of 0.001 or more and 0.06 or less with respect to 100 parts by weight of the binder resin.
- the fine particles are preferably contained in an amount of 10 to 100 parts by weight. Further, the fine particles are completely embedded in the antiglare layer, and the fine particles are uneven on the surface. It is preferable that the shape is not affected. In this way, by independently controlling the fine surface irregularity shape and the internal scattering of the antiglare film, the fine surface irregularity shape of the antiglare film that mainly determines the reflection characteristics and the antiglare property that mainly determines the transmission characteristics.
- the composition of the layer can be controlled separately. As a result, the above optical characteristics can be easily achieved. The formation of such an antiglare layer will be described in detail later.
- the antiglare film of the present invention exhibits a sufficient antiglare function even in a state where there is no low reflection film on the outermost surface, that is, the uneven surface side, but it can also be used with a low reflection film attached to the outermost surface. it can.
- the low reflection film can be formed by providing a layer of a low refractive index material having a lower refractive index on the antiglare layer.
- low refractive index material examples include lithium fluoride (L i F), magnesium fluoride (M g F 2 ), aluminum fluoride (A 1 F 3 ), cryolite (3 N a F ⁇ A 1 F 3 or Na 3 A 1 F 6 ) and other inorganic low-reflective materials containing acryl-based resin or epoxy-based resin, fluorine-based or silicone-based Examples thereof include organic low reflection materials such as organic compounds, thermoplastic resins, thermosetting resins, and ultraviolet curable resins.
- the antiglare film of the present invention uses a mold having irregularities formed in a predetermined shape, transfers the concave / convex surface of the mold to a transparent resin film, and then peels the transparent resin film having the irregular surface transferred from the mold.
- the method is advantageously produced. More specifically, copper plating or nickel plating is applied to the metal surface, and after polishing the plating surface, fine particles are applied to the polished surface to form irregularities, and the irregular shape is blunted.
- the uneven surface is chrome-plated to form a mold, and the uneven surface of the mold is transferred to the resin applied on the transparent support, and then the resin with the transferred unevenness is transferred to the transparent support together.
- the surface of the metal substrate is subjected to copper plating or nickel plating, and the plating is performed.
- bumps are formed on the polished surface to form irregularities, and the irregular shape is blunted, and then the irregular surface is chrome-plated to form a mold.
- bumps are formed by bumping fine particles, and the surface of the metal substrate that forms the chromium plating layer is subjected to copper plating or nickel plating. In this way, by applying copper plating or nickel plating to the surface of the metal constituting the mold, it is possible to improve the adhesion and gloss of chromium plating in the subsequent process.
- the copper or nickel as used herein may be a pure metal, or may be an alloy mainly composed of copper or an alloy mainly composed of nickel. Therefore, the term “copper” as used in the present specification is meant to include copper and a copper alloy, and the term “nickel” is meant to include nickel and a nickel alloy. Copper plating and nickel plating may be performed with electrolytic plating or electroless plating, but electrolytic plating is usually used.
- suitable metals for forming the mold include aluminum and iron from the viewpoint of cost. Further, for convenience of handling, lightweight aluminum is more preferable.
- Aluminum and iron here may be pure metals, respectively, or may be an alloy mainly composed of aluminum or iron. Table of such metal substrate Apply copper plating or nickel plating to the surface and polish the surface to obtain a smoother and more glossy surface, then hit the surface with fine particles to form fine irregularities and blunt the irregularities After the processing to make it, further chrome plating is given there, and the mold is configured.
- the thickness is preferably 10 2 m or more.
- the upper limit of the thickness is not critical, generally about 500 m is sufficient from the viewpoint of cost.
- the shape of the mold may be a flat metal plate or a cylindrical or cylindrical metal mouthpiece. If a metal mold is produced using a metal roll, the antiglare film can be produced in a continuous roll shape.
- FIG. 7 is a cross-sectional view schematically showing the process until a mold is obtained, using a flat plate as an example.
- A in FIG. 7 shows a cross-section of the base material after copper plating or nickel plating and mirror polishing.
- a metal base 31 has a surface layer 3 2 formed on the surface. The surface is a polished surface 33. Unevenness is formed by hitting fine particles against the surface of the plated layer 32 after such mirror polishing.
- (B) in FIG. 7 is a schematic cross-sectional view of the base material 31 after hitting the fine particles, and a fine concave surface 34 having a partially spherical shape is formed by hitting the fine particles.
- (C) in FIG. 7 is a schematic cross-sectional view of the base material 31 after the surface on which the unevenness due to the fine particles is formed is made to make the uneven shape blunt, and (C 1) is blunted by the etching process. And (C 2) represents the state that has been dulled by copper plating.
- the partial spherical concave surface corresponding to (B) before being blunted by etching is indicated by a broken line.
- the concave surface 34 and the acute protrusion shown in (B) are shaved by etching, and the acute protrusion on the partial sphere is blunted. 3 6 a is formed.
- the copper plating layer 35 is formed on the concave surface 34 shown in (B), so that an acute protrusion on the partial spherical surface is formed.
- FIG. 7 is a schematic cross-sectional view after chrome plating, and (D 1) is chrome plating on the uneven surface 36 a blunted by the etching shown in (C 1). (D2) is obtained by applying chrome plating to the copper plating layer 35 shown in (C2).
- a chrome plating layer 37 is formed on the surface 36 a that has been blunted by the etching shown in (C 1).
- the surface 38 is further dulled by chrome plating compared to the uneven surface 36a of (C 1), in other words, the uneven shape is relaxed.
- the copper plating layer 35 is formed on the fine concave surface formed on the copper or nickel plating layer 32 on the base material 31, Further, a chrome plating layer 37 is formed thereon, and the surface 38 is duller than the concavo-convex surface 36b of (C2) due to chrome plating. It is in a state.
- the plated layer made of copper or nickel on the base material is struck with fine particles in a state where the surface is polished, but it is particularly preferable that the plating layer is polished close to a mirror surface. This is because the base metal plate or metal base is often subjected to machining such as cutting or grinding in order to achieve the desired accuracy. Because it is.
- the optical properties may be unexpectedly affected.
- the method of polishing the surface of the substrate on which plating has been applied there is no particular limitation on the method of polishing the surface of the substrate on which plating has been applied, and any of mechanical polishing, electrolytic polishing, and chemical polishing can be used.
- mechanical polishing methods include super-finishing, lapping, fluid polishing, and buffing.
- the surface roughness after polishing is preferably 0.5 / m or less, more preferably 0.1 m or less, expressed as the center line average roughness Ra. If R a becomes too large, even if the metal surface is deformed by hitting fine particles, the influence of the surface roughness before deformation may remain, which is not preferable.
- the lower limit of R a is not particularly limited, and there is no need to specify it because there is a natural limit from the viewpoint of machining time and machining cost.
- an injection processing method is preferably used as a method of hitting the surface of the base material with the fine particles.
- injection processing include sand blasting, shot blasting, and liquid honing.
- the particles used in these processes are preferably spherical shapes rather than shapes with sharp corners, and hard particles that are broken during processing and do not produce sharp corners are preferred. .
- spherical zirconia beads and alumina beads are preferably used for ceramic particles.
- steel is preferably made of stainless steel.
- particles in which ceramic or metal particles are supported on a resin binder may be used.
- particles having an average particle diameter of 10 to 1550 m are preferable to use as the fine particles hitting the surface of the base material, and thus exhibiting excellent anti-glare performance.
- An antiglare film can be produced. If the average particle size of the fine particles is smaller than 10 m, it will be difficult to form sufficient irregularities on the plated surface, and it will be difficult to obtain sufficient antiglare performance. On the other hand, if the average particle size of the fine particles is larger than 1550 xm, the surface irregularities become rough, causing glare or texture. It drops or is soggy.
- a wet blasting method in which the particles are processed by being dispersed in an appropriate dispersion medium so that the particles do not aggregate due to static electricity or the like.
- the pressure when hitting the fine particles, the amount of fine particles used, the distance from the nozzle that sprays the fine particles to the metal surface, etc. also affect the uneven shape after processing, and eventually the surface shape of the antiglare film.
- a gauge pressure of about 0.05 to 0.4 MPa, an amount of fine particles of about 4 to 12 g per 1 cm2 of surface area of the metal to be treated, and a distance of about 200 to 60 Omra from the nozzle for injecting the fine particles to the metal surface.
- What is necessary is just to select suitably according to a kind, a particle size, the kind of metal, the shape of the nozzle which injects microparticles
- the uneven shape formed by hitting fine particles against the surface of the base material has an arithmetic average height Pa in the cross-section curve of 0.1 m to 1 m, and the arithmetic average height Pa in the cross-section curve
- the ratio PaZP Sm of the average length P Sm is preferably 0.02 or more and 0.1 or less. If the arithmetic average height Pa is less than 0.1 m or the ratio PaZP Sm is less than 0.02, the uneven surface is almost flat when the uneven shape is blunted before the chrome plating. However, it is difficult to obtain a mold with the desired surface shape.
- corrugated shape is given to the base material with which the copper plating or the unevenness
- etching treatment or copper plating is preferable.
- the sharp portions of the concavo-convex shape produced by hitting the fine particles are eliminated.
- the optical characteristics of the antiglare film produced when used as a mold are changed in a preferable direction.
- copper plating has a strong smoothing action, so it has a stronger effect of dulling the uneven shape than chromium plating. Thereby, The optical properties of the antiglare film produced when used as a mold change in a preferred direction.
- Etching is usually performed using ferric chloride (F e C 1 3 ) aqueous solution, cupric chloride (C u C 1 2 ) aqueous solution, alkaline etching solution (C u (NH 3 ) 4 C 1 2 ), etc. Although it is performed by corroding the surface, strong acid such as hydrochloric acid or sulfuric acid can be used, or reverse electrolytic etching by applying a potential opposite to that at the time of electrolytic plating can be used. The degree of unevenness after etching is different depending on the type of underlying metal and the size and depth of the unevenness obtained by blasting techniques. The biggest factor is the amount of etching. The etching amount here is the thickness of the plating layer that is removed by etching.
- the amount of etching is preferably 1 m or more and 20 m or less, and more preferably 2 m or more and 10 m or less.
- the unevenness of the unevenness differs depending on the type of base metal, the size and depth of the unevenness obtained by blasting techniques, the type and thickness of the unevenness, etc.
- the biggest factor in controlling the degree of rounding is the thickness of the inlay. If the thickness of the copper plating layer is thin, the effect of dulling the surface shape of the unevenness obtained by blasting techniques is insufficient, and the optical properties of the antiglare film obtained by transferring the uneven shape to a transparent film The characteristics are not so good. On the other hand, if the plating thickness is too thick, the productivity is deteriorated and the uneven shape is almost eliminated, so that the antiglare property is not exhibited.
- the thickness of the copper plating is preferably 1 m or more and 20 m or less, and more preferably 4 m or more and 10 m or less.
- the surface of the unevenness is further dulled by applying further chromium plating.
- make a metal plate with increased surface hardness In this case, the unevenness of the unevenness differs depending on the type of base metal, the size and depth of the unevenness obtained by blasting techniques, and the type and thickness of the interference. The biggest factor in controlling the thickness is the thickness of the metal.
- the thickness of the chrome plating layer is thin, the effect of dulling the surface shape of the unevenness obtained before the chrome plating process is insufficient, and the antiglare film obtained by transferring the uneven shape to a transparent film is insufficient. Optical properties are not so good.
- the thickness of the chrome plating is preferably 1 im or more and 10 m or less, more preferably 2 m or more and 6 m or less. Chrome plating is glossy, has high hardness, has a low coefficient of friction, and provides good releasability.
- Chromium plating is usually carried out by electrolysis, and an aqueous solution containing chromic anhydride (CrO 3 ) and a small amount of sulfuric acid is used as the plating bath. By adjusting the current density and electrolysis time, the thickness of the chromium plating can be controlled.
- CrO 3 chromic anhydride
- the die surface to which chrome plating is applied preferably has a picker hardness of 800 or more, more preferably 1,00 or more. If the Vickers hardness is low, the durability when using a mold is reduced, and the hardness decreases due to chrome plating, which may indicate an abnormality in the plating bath composition and electrolytic conditions during the plating process. It is highly likely that the occurrence of defects will also have an undesirable effect.
- Patent Document 1 Japanese Patent Laid-Open No. 2002-189106
- Patent Document 4 Japanese Laid-Open Patent Publication No. 2004-90187 listed above as background art
- chrome adheres to the surface of a metal base material to be a mold.
- the surface becomes rough after plating, or many micro cracks are generated due to chrome plating.
- the optical properties of the antiglare film to be produced tend to be unfavorable. Those with a rough plating surface are not suitable for molds for anti-glare films.
- polishing of the surface after chrome plating is performed in order to eliminate roughness, but as described later, polishing of the surface after staking is not preferable in the present invention.
- polishing of the surface after staking is not preferable in the present invention.
- by applying copper plating or nickel plating to the base metal such inconveniences that are likely to occur due to chromium plating are eliminated.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-189106
- Patent Document 3 Japanese Patent Laid-Open No. 2004-29240
- Patent Document 4 Japanese Patent Laid-Open No. 2004-90187
- FIG. 3 is a schematic cross-sectional view of a metal plate in which a flat surface is produced when the surface subjected to the polishing is polished.
- Fig. 8 shows an example of polishing the chrome-plated surface after etching shown in (D 1) of Fig. 7, but the post-copper chrome plating shown in (D 2) of Fig. 7 is shown. In the case of adhesion, if the surface is polished, a flat surface will be generated as well.
- An anti-glare film can be obtained by transferring the shape of the mold obtained by the method described above to a transparent resin film.
- the transfer to the mold-shaped film is preferably performed by embossing.
- embossing include a UV embossing method using a photocurable resin and a hot embossing method using a thermoplastic resin.
- a photocurable resin layer is formed on the surface of a transparent support, and the photocurable resin layer is cured by pressing the photocurable resin layer against the uneven surface of the mold. Transferred to the resin layer.
- an ultraviolet curable resin is placed on a transparent support. With the coated UV curable resin in close contact with the uneven surface of the mold, the UV curable resin is cured by irradiating UV from the transparent support side. By peeling the support on which the curable resin layer is formed from the mold, the shape of the mold is transferred to the ultraviolet curable resin.
- the kind of ultraviolet curable resin is not particularly limited.
- an ultraviolet curable resin a resin that can be cured with visible light having a wavelength longer than that of ultraviolet light can be obtained by appropriately selecting a photoinitiator. That is, the term “ultraviolet curable resin” as used herein is a general term including such visible light curable resins.
- the hot embossing method a transparent thermoplastic resin film is pressed against a mold in a heated state, and the surface shape of the mold is transferred to the thermoplastic resin film.
- the UV embossing method is preferred from the viewpoint of productivity.
- the transparent support used for the production of the antiglare film may be a substantially optically transparent resin film.
- ⁇ ⁇ ⁇ ⁇ -acetylcellulose, polyethylene terephthalate, polymethyl methacrylate, polycarbonate, norbornene compound A solvent cast film, an extruded film, or the like made of a thermoplastic resin such as amorphous cyclic polyolefin using a monomer as a monomer can be used.
- a commercially available product can be used as the ultraviolet curable resin.
- polyfunctional acrylates such as trimethylolpropane triacrylate and pentaerythritol 1 ⁇ monotetratetraacrylate are used singly or in combination of two or more of them, and “Irgacure 907”, “Irgacure 184” (Hereinafter, a mixture of a photopolymerization initiator such as Ciba Specialty 'Chemicals') or "Lucirin TPO" (BASF) can be used as an ultraviolet curable resin.
- thermoplastic transparent resin film used in the hot embossing method may be any material as long as it is substantially transparent.
- polymethyl methacrylate, poly force, and polyethylene terephthalate polymethyl methacrylate, poly force, and polyethylene terephthalate.
- Thermoplastics such as amorphous cyclic polyolefins with triacetyl cellulose and norbornene compounds as monomers Resin solvent cast films and extruded films can be used. These transparent resin films can also be used as a transparent support when the UV embossing method described above is adopted.
- the antiglare film of the present invention uses a mold having irregularities formed in a predetermined shape, transfers the irregular surface of the mold to a resin applied on a transparent support, and then transfers the resin with the irregular surface transferred thereto. It is preferable to form fine irregularities on the surface by the method of peeling from the mold, and the average particle size in the resin used for transfer is 5 m or more and 15 xi m or less, and the difference in refractive index from the binder resin is 0.0. It is preferable that 10 to 100 parts by weight of fine particles of 1 or more and 0.06 or less are contained with respect to 100 parts by weight of the binder resin.
- the average particle size of the fine particles blended in the binder resin is less than 5 / m, the value on the wide-angle side of the transmission scattering profile increases, resulting in a decrease in contrast when applied to an image display device. It is not preferable. Conversely, when the average particle size exceeds 15 mm, it is preferable to completely embed the particles in the binder resin as will be described later. From the viewpoint of burying the particles, the film thickness tends to increase. become. As a result, problems such as agglomeration tend to occur when the resin is applied.
- the difference in refractive index between the fine particles and the binder resin is less than 0.01, the effect of internal scattering by the fine particles will be reduced, so the glare is eliminated by giving the anti-glare layer the prescribed scattering characteristics and haze.
- this difference in refractive index exceeds 0.06, the difference in refractive index is large, so that the reflectance at the interface between the binder resin and the fine particles increases, resulting in an increase in backscattering and a total light transmittance. Is unfavorable because it decreases.
- the fine particles have a refractive index of about 1.40 to 1.60. It can be appropriately selected according to the design of the antiglare film.
- resin beads or substantially spherical particles are preferably used as the fine particles. Examples of such suitable resin beads are listed below. Melamine beads (refractive index 1 ⁇ 57),
- Methyl methacrylate ⁇ Styrene copolymer resin beads (refractive index 1.50-1.59), polycarbonate beads (refractive index 1.55),
- Silicone resin beads (refractive index 1.46) etc. Further, it is preferable that these fine particles do not affect the uneven shape of the surface, that is, the particles are completely buried in the binder resin. This is because when the fine particles protrude from the surface, the surface irregularities change depending on the shape of the fine particles, which affects the reflection characteristics of the anti-glare film (such as anti-glare performance and whitishness). The In this way, when fine particles protrude from the surface, the surface shape must be designed in consideration of the shape, concentration, dispersibility, etc. of the particle in addition to the surface shape of the mold described above. Design / control becomes complicated and difficult, making it difficult to obtain the expected characteristics. Therefore, it is preferable to control the surface shape, which mainly affects the reflection characteristics, only by the mold, and to control the scattering characteristics independently by a combination of resin and particles.
- the antiglare film of the present invention configured as described above has an excellent antiglare effect, effectively prevents white glare, and can effectively suppress the occurrence of glare and the reduction of contrast wrinkles. It becomes excellent in visibility when mounted on.
- this antiglare film can be applied to the polarizing plate. That is, the polarizing plate is generally in the form of a protective film bonded to at least one side of a polarizer composed of a polyvinyl alcohol-based resin film adsorbed and oriented with iodine or a dichroic dye.
- An anti-glare polarizing plate can be obtained by comprising a dazzling film, and laminating the polarizer and the anti-glare film of the present invention on the transparent support side of the anti-glare film.
- the other surface of the polarizer may be left as it is, another protective film or an optical film may be laminated, and an adhesive layer for bonding to the liquid crystal cell is formed.
- the antiglare polarizing plate can be obtained by bonding the antiglare film of the present invention to the polarizing plate having a protective film bonded to at least one side of the polarizer on the transparent support side.
- the antiglare polarizing plate can be obtained by providing the above-mentioned antiglare unevenness on the surface of the single-sided protective film.
- the image display device of the present invention is a combination of an antiglare film or an antiglare polarizing plate having a specific surface shape as described above and an image display element.
- the image display element is typically a liquid crystal panel that includes a liquid crystal cell in which liquid crystal is sealed between upper and lower substrates and displays an image by changing the alignment state of the liquid crystal by applying a voltage.
- the antiglare film of the present invention can also be applied to various known displays such as display panels, CRT displays, and organic EL displays.
- an image display apparatus is comprised by arrange
- the antiglare film may be directly bonded to the surface of the image display element.
- the antiglare film is bonded to the surface of the liquid crystal panel via the polarizer.
- the image display device provided with the antiglare film of the present invention can scatter incident light due to the unevenness of the surface of the antiglare film and blur the reflected image, giving excellent visibility. It becomes.
- the antiglare film of the present invention is applied to a high-definition image display device, the glare as seen in the conventional antiglare film does not occur, and the image is sufficiently prevented from being reflected. Prevention of glare, suppression of glare, suppression of contrast reduction 2
- the antiglare film is bonded to a glass substrate so that the uneven surface becomes the surface, and parallel to the He-Ne laser from the direction inclined at a predetermined angle with respect to the film normal on the glass surface side.
- Light was irradiated, and the transmitted scattered light intensity in the film normal direction was measured on the uneven surface side of the antiglare film.
- both “3292 03 optical power sensor” and “3292 optical power meter” manufactured by Yokogawa Electric Corporation were used. (Reflection profile)
- the haze of the anti-glare film was measured using a “HM-150” type haze meter manufactured by Murakami Color Research Laboratory Co., Ltd. based on J IS K 7136. In order to prevent the sample from warping, it was bonded to a glass substrate using an optically transparent adhesive so that the concavo-convex surface became the surface, and the total haze was measured in that state.
- the internal haze was measured by attaching a triacetyl cellulose film having a haze of almost 0 to the concave surface of the antiglare film with glycerin.
- the reflection clarity of the antiglare film was measured using an image clarity measuring device “ICM-1DP” manufactured by Suga Test Instruments Co., Ltd. in accordance with J IS K 7105.
- ICM-1DP image clarity measuring device
- J IS K 7105 J IS K 7105.
- a 2 n-thick black acrylic resin plate was adhered to the glass surface of the glass plate with an antiglare film attached with water, and in this state the sample ( Measurement was performed by making light incident from the side of the antiglare film.
- the measured values here are the sum of the values measured using three types of optical combs with the width of the hip and light areas of 0.5 thigh, 1.0 awakening, and 2.0 mm, respectively. Value.
- the surface shape of the antiglare film was measured using a confocal microscope “PL 2300” manufactured by Sensofar. In this case as well, in order to prevent the sample from warping, it was used for measurement after being bonded to a glass substrate using an optically transparent adhesive so that the uneven surface became the surface. During the measurement, the magnification of the objective lens was 50 times, and the measurement was performed at a reduced resolution. This is because if the measurement is performed at a high resolution, fine irregularities on the sample surface will be measured, which will hinder the force of the convex part.
- the antiglare film is bonded to the black acrylic resin plate so that the uneven surface becomes the surface, and visually observed from the uneven surface side in a bright room with a fluorescent lamp. Then, the presence / absence of reflection of fluorescent lamps, the degree of whitening and the texture were visually evaluated. Reflection, whitishness and texture were evaluated according to the following criteria in three stages from 1 to 3, respectively. Reflection 1: Reflection is not observed.
- Texture 1 Fine eyes and good texture.
- a photomask having a unit cell pattern as shown in a plan view in FIG. 9 was prepared.
- a unit cell 40 is formed by forming a key-shaped chrome light-shielding pattern 41 having a line width of 10 on a transparent substrate, and a portion where the chrome light-shielding pattern 41 is not formed is an opening 4.
- the unit cell size is 2 5 4 m x 8 4 m (vertical X horizontal in the figure), and therefore the size of the opening is 2 4 4 m X 7 (vertical X horizontal in the figure).
- a large number of unit cells shown in the figure are arranged vertically and horizontally to form a photomask.
- the chrome light shielding pattern 4 1 of the photomask 4 3 is placed on the light box 4 5 with the anti-glare film 1 on the glass plate 4 7 with an adhesive. Place the sample with 1 on the photomask 43 so that the uneven surface becomes the surface. In the light box 45, a light source 46 is disposed. In this state, by visually observing at a position 49 that is approximately 3 O cm away from the sample, the degree of glare was sensory evaluated in seven stages. Level 1 corresponds to a state where no glare is observed, Level 7 corresponds to a state where severe glare is observed, and Level 3 refers to a state where slight glare is observed. (Contrast evaluation)
- a polarizing plate "Sumikaran SRDB831E” manufactured by Sumitomo Chemical Co., Ltd. was bonded via an adhesive so that each absorption axis coincided with the absorption axis of the original polarizing plate.
- the antiglare film shown in each of the following examples was bonded via an adhesive such that the concavo-convex surface was the surface.
- the liquid crystal television thus obtained was started up in a dark room, and brightness was measured in a black display state and a white display state using a luminance meter “BM5A” manufactured by Topcon Corporation, and the contrast was calculated.
- the contrast is represented by the ratio of the luminance in the white display state to the luminance in the black display state.
- the copper ballad plating consists of a copper plating layer Z, a thin silver plating layer, and a surface copper plating layer, and the total thickness of the plating layer was about 200 m.
- the copper plating surface is mirror-polished, and the blasting device (manufactured by Fuji Seisakusho Co., Ltd.) is used on the polished surface to make Zirconia Abyss "TZ-B53" (manufactured by Tosoichi Co., Ltd.) Product name, average particle size 53 m), beads consumption 8 g Zcm 2 (per surface area of roll), blast pressure 0.15 MPa (gauge pressure), distance from nozzle to spray fine particles to metal surface Blasting was performed under the condition of 4 50 mm, and the surface was uneven. Etching was performed with the salty cupric aqueous solution on the obtained copper-plated iron roll with unevenness. The etching amount at that time was set to 8 nm. After that, chrome plating was performed to make a mold for embossing. At this time, the chrome plating thickness was set to 4 m. The obtained mold had a surface Vickers hardness of 1, 00 and 0.
- Methyl methacrylate Z styrene copolymer resin beads having an average particle diameter of 8 and a refractive index of 1.565 are added to this ultraviolet curable resin composition, and 25 parts per 100 parts of the ultraviolet curable resin.
- a coating solution was prepared by adding ethyl acetate so that the solid content (including resin beads) was 50%.
- the above coating solution was applied so that the coating thickness after drying would be 10 im, and in a dryer set at 60 ° C. Dry for 3 minutes.
- the dried film was adhered to the uneven surface of the mold produced in (A) by pressing with a rubber roll so that the ultraviolet curable resin composition layer was on the mold side.
- the UV curable resin composition layer is cured by irradiating light from a high-pressure mercury lamp with an intensity of 2 O mWZcm 2 from the TAC film side so that the amount of light in terms of h-line is 20 O mJ / cm 2. It was. Thereafter, the TAC film was peeled from the mold together with the hard resin to obtain a transparent anti-glare film comprising a laminate of a cured resin having irregularities on the surface and a TAC film.
- the obtained antiglare film was evaluated for optical properties, uneven surface shape and antiglare performance by the above-described method, and the results were evaluated together with the mold preparation conditions and the type and amount of fine particles used for the preparation of the antiglare layer. It is shown in Table 1.
- Figure 11 shows the transmission and scattering profile graph
- Figure 12 shows the reflection profile graph.
- (A) summarizes the amount of etching during mold fabrication and the type and amount of fine particles used to fabricate the antiglare layer
- (B) summarizes the optical properties of the antiglare film.
- C summarizes the surface shape and antiglare performance of the antiglare film.
- the breakdown of the reflection definition in Table 1 (B) is as follows. PT / JP2008 / 058592
- the amount of etching at the time of mold production was changed as shown in Table 1, and in the same manner as in Example 1, an embossing mold having irregularities on the surface was produced.
- the obtained mold had a surface picker hardness of 1,000.
- a transparent antiglare film comprising a laminate of a cured resin having irregularities on the surface and a TAC film was produced.
- Example 3 The same mold as in Example 1 was used, and the type of fine particles used in the preparation of the antiglare layer and the addition amount with respect to 100 parts by weight of Z or UV curable resin were changed as shown in Table 1, and the others were as in Example 1.
- a transparent antiglare film comprising a laminate of a hard resin having irregularities on the surface and a TAC film was produced.
- the fine particles used in Example 3 are the same methyl methacrylate Z-styrene copolymer resin beads as in Example 1.
- the fine particles used in Example 4 have an average particle diameter of 8 m and a refractive index. These are 1.490 methyl polymethacrylate beads.
- Comparative Example 1 the same mold as in Example 1 was used, and in Comparative Example 2, the same mold as in Example 2 was used. Both used UV-curable resin compositions that did not contain resin beads.
- a transparent anti-glare film comprising a laminate of a cured resin having irregularities on the surface and a TAC film was produced.
- the optical properties, surface shape and antiglare performance of the obtained antiglare film are shown in Table 1 together with the data of Example 1.
- a graph of the transmission / scattering profile of these antiglare films is shown in FIG. 13, and a graph of the reflection profile file is shown in FIG.
- Examples 1 and 2 satisfying the requirements of the present invention show excellent anti-glare performance (low reflection and good texture), but no glare or white blurring occurs. Even when applied to an image display device, it showed high contrast. Further, in Examples 3 and 4 in which the internal haze was increased, it was found that the glare was more effectively suppressed although the contrast wrinkles slightly decreased as compared with Examples 1 and 2. On the other hand, Comparative Examples 1 and 2 have almost the same surface shape as Examples 1 and 2, respectively. Therefore, while exhibiting excellent anti-glare performance, whitening does not occur and contrast is high. Although at least one of the relative scattered light intensities T (2 0) and T (3 0) is less than that of the present invention, the glare is strong and the visibility is remarkably improved when applied to an image display device. It was reduced.
- Examples 1, 3 and 4 and Comparative Example 1 produce an antiglare film using the same mold
- Example 2 and Comparative Example 2 also produced an antiglare film using the same mold. is doing. And the reflection characteristics of the anti-glare films produced using these same molds are almost the same, and this result shows that the added fine particles do not affect the surface shape.
- porous sill force fine particles having an average particle diameter of about 10 m and a refractive index of 1.46 were added to the UV curable resin.
- methyl methacrylate methyl Z styrene copolymer resin beads having an average particle size of 3 m and a refractive index of 1.57 were UV cured.
- the amount shown in Table 2 per 100 parts of the base resin was added and dispersed, and then ethyl acetate was added so that the solid content (including silica fine particles and resin beads) was 30%. Prepared.
- the above coating solution was applied on a triacetylcellulose (TAC) film with a thickness of 80 m so that the coating thickness after drying would be 4, and in a dryer set at 60 ° C. And dried for 3 minutes.
- TAC triacetylcellulose
- strength 2 OmW / cm 2 of light from a high pressure mercury lamp was irradiated such that the 20 OmJZcm 2 by h lines converted amount, ultraviolet curable resin composition
- the layer was cured to obtain a transparent antiglare film comprising a laminate of a cured resin having irregularities on the surface and a TAC film.
- the silica fine particles protrude from the surface of the antiglare layer, as can be seen from the relationship between the particle size of silica fine particles (about 10 m) and the coating thickness (4 DI).
- the obtained antiglare film was evaluated for optical properties, uneven surface shape and antiglare performance by the methods described above, and the results are shown in Table 2 together with the resin composition.
- Table 2 (A) summarizes the fine particles blended in the curable resin, (B) summarizes the optical properties of the antiglare film, and (C) shows the surface shape and anti-glare of the antiglare film. This is a summary of dazzling performance.
- Fig. 15 shows the transmission and scattering profile graphs, and Fig. 16 shows the reflection profile graphs. Table 2
- the average length PSm is large, the number of convex portions is small, the average area of the Polonoy polygon is large, and the overall shape is larger than that defined in the present invention. Despite the strong light, glare was not sufficiently suppressed. In Comparative Example 5, since the relative scattered light intensities T (20) and T (30) greatly exceeded the specifications of the present invention, no glare occurred, but the contrast ⁇ was greatly reduced. . In Comparative Examples 3 to 5, the average length PSm is generally large, the average area of the Poronoy polygon exceeds the provisions of the present invention, and the number of convex portions is less than the provisions of the present invention. It was rough and looked good.
- Comparative Example 6 the relative scattered light intensities T (20) and T (30) were lower than the provisions of the present invention, so the contrast did not decrease, but the glare was strong and the visibility was significantly reduced. Moreover, since all the requirements for the surface shape were not within the scope of the present invention, the quality was poor and it looked good. In Comparative Example 7, the relative scattered light intensity T (30) at 30 ° incidence was less than that of the present invention, resulting in glare. In Comparative Examples 8 and 9, since the relative scattered light intensities T (20) and T (30) were generally large, no glare occurred, but the contrast was greatly reduced.
- the anti-glare film of the present invention exhibits excellent anti-glare performance, prevents deterioration of visibility due to whitening, and generates glare when placed on the surface of a high-definition image display device. Therefore, a high contrast is exhibited.
- An anti-glare polarizing plate combining this anti-glare film with a polarizer also exhibits the same effect.
- positioned the anti-glare film or anti-glare polarizing plate of this invention has high anti-glare performance, and becomes what was excellent in visibility.
- the antiglare film of the present invention By disposing the antiglare film of the present invention on various displays such as a liquid crystal panel, a plasma display panel, a CRT display, and an organic EL display so that the antiglare film is closer to the viewing side than the image display element. It is possible to blur the reflected image without causing a flicker and a glare, and give excellent visibility.
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Abstract
Description
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CN200880014610XA CN101675362B (zh) | 2007-05-08 | 2008-04-30 | 防眩薄膜、防眩性偏振板及图像显示装置 |
KR1020097023741A KR101438859B1 (ko) | 2007-05-08 | 2008-04-30 | 방현 필름, 방현성 편광판 및 화상 표시 장치 |
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JP2014511498A (ja) * | 2011-11-25 | 2014-05-15 | エルジー・ケム・リミテッド | 超撥水基板及びその製造方法 |
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JP5163943B2 (ja) * | 2008-02-26 | 2013-03-13 | 住友化学株式会社 | 防眩フィルム、防眩性偏光板および画像表示装置 |
JP2010191412A (ja) * | 2009-01-21 | 2010-09-02 | Toppan Printing Co Ltd | 防眩フィルム |
JP2010244016A (ja) * | 2009-03-18 | 2010-10-28 | Toppan Printing Co Ltd | 防眩フィルム、偏光板、透過型液晶ディスプレイ |
JP5158444B2 (ja) * | 2009-03-25 | 2013-03-06 | 住友化学株式会社 | 防眩フィルムの製造方法および防眩フィルム作製のための金型の製造方法 |
JP5158443B2 (ja) * | 2009-03-25 | 2013-03-06 | 住友化学株式会社 | 防眩フィルムおよびその製造方法、ならびに金型の製造方法 |
JP5354668B2 (ja) * | 2009-06-09 | 2013-11-27 | 住友化学株式会社 | 防眩フィルムの製造方法、防眩フィルムおよび金型の製造方法 |
JP2011017829A (ja) * | 2009-07-08 | 2011-01-27 | Sumitomo Chemical Co Ltd | 防眩フィルムおよびその製造方法 |
JP2011203319A (ja) * | 2010-03-24 | 2011-10-13 | Sumitomo Chemical Co Ltd | 偏光板のセット、ならびにこれを用いた液晶パネルおよび液晶表示装置 |
JP2012212121A (ja) * | 2011-03-18 | 2012-11-01 | Sumitomo Chemical Co Ltd | 偏光子保護フィルム |
JP2012212119A (ja) * | 2011-03-18 | 2012-11-01 | Sumitomo Chemical Co Ltd | 偏光子保護フィルム |
JP5653378B2 (ja) | 2011-09-27 | 2015-01-14 | 日本製紙株式会社 | 防眩ハードコートフィルム |
US9507057B2 (en) * | 2011-10-12 | 2016-11-29 | Dai Nippon Printing Co., Ltd. | Anti-glare sheet for image display device |
KR102346772B1 (ko) * | 2012-03-30 | 2022-01-03 | 주식회사 쿠라레 | 폴리비닐알코올계 중합체 필름 |
JP6258012B2 (ja) * | 2013-11-15 | 2018-01-10 | リンテック株式会社 | ハードコートフィルム、透明導電性フィルムおよび静電容量タッチパネル |
JP6736381B2 (ja) * | 2016-06-27 | 2020-08-05 | 株式会社トッパンTomoegawaオプティカルフィルム | 光学積層体、偏光板及び表示装置 |
JP6674371B2 (ja) * | 2016-12-14 | 2020-04-01 | 株式会社トッパンTomoegawaオプティカルフィルム | 光学積層体、偏光板及び表示装置 |
EP3828310A1 (en) * | 2019-11-29 | 2021-06-02 | Toto Ltd. | Wet-area device and method for manufacturing wet-area device |
KR20220122325A (ko) * | 2021-02-26 | 2022-09-02 | 동우 화인켐 주식회사 | 편광판 및 이를 포함하는 화상표시장치 |
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JP2000338309A (ja) * | 1999-05-28 | 2000-12-08 | Sumitomo Chem Co Ltd | 画像表示装置 |
JP2006053371A (ja) * | 2004-08-12 | 2006-02-23 | Sumitomo Chemical Co Ltd | 防眩フィルム、その製造方法、そのための金型の製造方法、及び表示装置 |
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KR20100016539A (ko) | 2010-02-12 |
CN101675362B (zh) | 2011-06-22 |
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JP2008281596A (ja) | 2008-11-20 |
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