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WO2016136871A1 - Panneau tactile, dispositif d'affichage, feuille optique, procédé de sélection de feuille optique et procédé de fabrication de feuille optique - Google Patents

Panneau tactile, dispositif d'affichage, feuille optique, procédé de sélection de feuille optique et procédé de fabrication de feuille optique Download PDF

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Publication number
WO2016136871A1
WO2016136871A1 PCT/JP2016/055607 JP2016055607W WO2016136871A1 WO 2016136871 A1 WO2016136871 A1 WO 2016136871A1 JP 2016055607 W JP2016055607 W JP 2016055607W WO 2016136871 A1 WO2016136871 A1 WO 2016136871A1
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WO
WIPO (PCT)
Prior art keywords
optical sheet
sra
transmission image
condition
optical
Prior art date
Application number
PCT/JP2016/055607
Other languages
English (en)
Japanese (ja)
Inventor
賢治 大木
玄 古井
涼平 宮田
Original Assignee
大日本印刷株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2015036589A external-priority patent/JP6500495B2/ja
Priority claimed from JP2015036582A external-priority patent/JP6497126B2/ja
Application filed by 大日本印刷株式会社 filed Critical 大日本印刷株式会社
Priority to KR1020177022927A priority Critical patent/KR102382755B1/ko
Priority to CN201680011477.7A priority patent/CN107250963B/zh
Publication of WO2016136871A1 publication Critical patent/WO2016136871A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/208—Touch screens
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2203/00—Indexing scheme relating to G06F3/00 - G06F3/048
    • G06F2203/041—Indexing scheme relating to G06F3/041 - G06F3/045
    • G06F2203/04103—Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices

Definitions

  • the present invention relates to a touch panel, a display device, an optical sheet, an optical sheet sorting method, and an optical sheet manufacturing method.
  • a transparent touch panel has a resistive film method that is excellent in terms of cost, but it has electrostatic capacity in that gesture operations such as multi-touch are possible, and it is difficult to impair the image quality of ultra-high-definition display elements.
  • touch panel touch panels particularly projection capacitive touch panels.
  • An anti-glare sheet having a concavo-convex structure may be provided on the surface of the touch panel for the purpose of preventing reflection of external light. Furthermore, for the prevention of adhesion and interference fringes between members constituting the touch panel, and prevention of adhesion and interference fringes between the touch panel and the display element, the outermost surface base material, the inner base material and the rearmost surface of the touch panel An optical sheet having a concavo-convex structure may be used as a substrate or the like.
  • Patent Documents 1 and 2 improve glare by imparting internal haze.
  • an ultra-high-definition display element with a pixel density of 300 ppi or more tends to be more glaring. If an attempt is made to suppress the glaring only by the internal noise, the internal noise must be further increased. Also, when the internal haze is large, the resolution tends to deteriorate, but this tendency is greater in the ultra-high definition display element. Therefore, even if attention is paid only to the inside as in Patent Documents 1 and 2, an optical sheet suitable for an ultrahigh-definition display element having a pixel density of 300 ppi or more cannot be obtained.
  • the optical sheets of Patent Documents 3 to 9 improve glare by lowering the inclination angle of the irregularities and weakening the degree of the irregularities. However, even the optical sheets disclosed in Patent Documents 3 to 9 cannot prevent glare in an ultra-high-definition display element having a pixel density of 300 ppi or more. In addition, the optical sheets of Patent Documents 3 to 9 have reduced the antiglare level.
  • the present invention has been made under such circumstances, and a touch panel, a display device, and an optical sheet that can prevent glare of image light of an ultra-high-definition display element having a pixel density of 300 ppi or more even when having an uneven structure.
  • the purpose is to provide.
  • the present invention also provides an optical sheet selection method and manufacturing method for preventing glare of image light of an ultra-high definition display element having a pixel density of 300 ppi or more.
  • the present inventors have found that the uneven surface of the optical sheet is 64 ⁇ m corresponding to the size of a pixel of an ultra-high definition display element (64 ⁇ m is an intermediate of 300 to 500 ppi, which is the mainstream as an ultra-high definition display element. It was found that the above problem can be solved by dividing the surface shape into a specific shape.
  • the present invention provides the following touch panel, display device and optical sheet of [1] to [5], an optical sheet sorting method, and an optical sheet manufacturing method.
  • Condition A-1 The uneven surface is divided into 64 ⁇ m square measurement areas, the three-dimensional arithmetic average roughness SRa in each measurement area is obtained, and the standard deviation ⁇ SRa of the three-dimensional arithmetic average roughness in all measurement areas is obtained. When calculated, ⁇ SRa is 0.050 ⁇ m or less.
  • Condition A-2 The uneven surface is divided into 64 ⁇ m square measurement areas, the three-dimensional arithmetic average roughness SRa in each measurement area is obtained, and the average SRa AVE of the three-dimensional arithmetic average roughness in all measurement areas is calculated.
  • SRa AVE is 0.100 ⁇ m or more.
  • Condition B-1 According to JIS K7374, the transmission image of the optical sheet for each of the optical comb widths of the image clarity measuring device of 0.125 mm, 0.25 mm, 0.5 mm, 1.0 mm and 2.0 mm Measure sharpness.
  • a display device having an optical sheet on the front surface of a display element having a pixel density of 300 ppi or more, wherein the optical sheet has a concavo-convex shape on the surface, and the optical sheet has the conditions A-1 and A display device that satisfies A-2 or satisfies the above conditions B-1 and B-2.
  • a method of selecting an optical sheet having a concavo-convex shape on the surface, which satisfies the above conditions A-1 and A-2 or satisfies the above conditions B-1 and B-2 as an optical sheet A method for selecting an optical sheet used on the front surface of a display element having a pixel density of 300 ppi or more.
  • a method of manufacturing an optical sheet having a concavo-convex shape on the surface, wherein the optical sheet satisfies the above conditions A-1 and A-2 or the above conditions B-1 and B-2 The manufacturing method of the optical sheet used for the front surface of the display element with a pixel density of 300 ppi or more manufactured.
  • the touch panel, display device, and optical sheet of the present invention can impart various properties such as anti-glare properties due to the uneven shape, and can prevent glare of image light of an ultra-high-definition display element having a pixel density of 300 ppi or more.
  • the optical sheet evaluation method of the present invention can perform glare evaluation without incorporating an optical sheet into a display device, and can efficiently control the quality of the optical sheet.
  • the method for producing an optical sheet of the present invention can efficiently produce an optical sheet that can prevent glare of image light of an ultra-high-definition display element having a pixel density of 300 ppi or more.
  • FIG. 1 is a scanning transmission electron micrograph (STEM) showing a cross section of the optical sheet of Example 1.
  • STEM scanning transmission electron micrograph
  • the touch panel of the present invention is a touch panel having an optical sheet as a constituent member, the optical sheet has an uneven shape on the surface, and the optical sheet satisfies the following conditions A-1 and A-2, or These are used for the front surface of a display element that satisfies the following conditions B-1 and B-2 and has a pixel density of 300 ppi or more.
  • Condition A-1 The uneven surface is divided into 64 ⁇ m square measurement areas, the three-dimensional arithmetic average roughness SRa in each measurement area is obtained, and the standard deviation ⁇ SRa of the three-dimensional arithmetic average roughness in all measurement areas is obtained.
  • Condition A-2 The uneven surface is divided into 64 ⁇ m square measurement areas, the three-dimensional arithmetic average roughness SRa in each measurement area is obtained, and the average SRa AVE of the three-dimensional arithmetic average roughness in all measurement areas is calculated. When SRa AVE is 0.100 ⁇ m or more.
  • Condition B-1 According to JIS K7374, the transmission image of the optical sheet for each of the optical comb widths of the image clarity measuring device of 0.125 mm, 0.25 mm, 0.5 mm, 1.0 mm and 2.0 mm Measure sharpness.
  • Examples of the touch panel include a capacitive touch panel, a resistive touch panel, an optical touch panel, an ultrasonic touch panel, and an electromagnetic induction touch panel.
  • These touch panels have a base material such as a glass base material and a plastic film base material, and the surface on the base material has an uneven shape for imparting various characteristics such as antiglare property, adhesion prevention and interference fringe prevention. May be formed.
  • the touch panel of the present invention uses an optical sheet to be described later as a substrate having an uneven shape on such a surface. In the case of imparting antiglare properties to the touch panel, it is preferable to use an optical sheet, which will be described later, as a surface member of the touch panel, and to install the optical sheet so that the surface on the uneven shape side faces the surface side.
  • the resistive touch panel 1 is not illustrated in a basic configuration in which a conductive film 12 of a pair of upper and lower transparent substrates 11 having a conductive film 12 is disposed via a spacer 13 so as to face each other. A circuit is connected.
  • a resistive film type touch panel it is preferable to use an optical sheet described later as the upper transparent substrate and / or the lower transparent substrate.
  • the upper transparent substrate and the lower transparent substrate may use an optical sheet described later as one base material as a multilayer structure including two or more base materials.
  • the optical sheet in the resistive film type touch panel is, for example, an optical sheet described later as the upper transparent substrate, and if the concave and convex surface of the optical sheet faces the opposite side of the lower transparent substrate, the resistive film type touch panel is anti-glare. And the glare of the ultra-high-definition display element can be prevented, and further, the resolution of the ultra-high-definition display element can be prevented from being lowered.
  • this method is preferable in that it can make it difficult to see the scratches on the surface of the touch panel, the conductive film, etc., and can contribute to the improvement of the yield.
  • the upper and lower conductive films are in close contact with each other while preventing the glare of the ultra-high-definition display element.
  • an optical sheet which will be described later, as the lower transparent substrate of the resistive touch panel, and by making the uneven surface of the optical sheet face the upper transparent substrate side, the reflection of the surface of the lower electrode is suppressed, and the The glare of the fine display element can be prevented.
  • the capacitive touch panel includes a surface type and a projection type, and a projection type is often used.
  • a projected capacitive touch panel is configured by connecting a circuit to a basic configuration in which an X-axis electrode and a Y-axis electrode orthogonal to the X-axis electrode are arranged via an insulator.
  • the basic configuration will be described more specifically.
  • a mode in which X-axis electrodes and Y-axis electrodes are formed on separate surfaces on a single transparent substrate, and an X-axis electrode, an insulator layer, and a Y-axis electrode are formed on the transparent substrate. As shown in FIG.
  • the X-axis electrode 22 is formed on the transparent substrate 21
  • the Y-axis electrode 23 is formed on another transparent substrate 21, and the adhesive layer 24 is interposed therebetween.
  • stacked are mentioned.
  • stacks another transparent substrate in these basic aspects is mentioned.
  • the transparent substrate may use an optical sheet to be described later as one base material as a multilayer structure including two or more base materials.
  • the capacitive touch panel When the capacitive touch panel has another transparent substrate on the basic mode described above, an optical sheet described later is used as the other transparent substrate, and the uneven surface of the optical sheet is opposite to the basic mode.
  • the capacitive touch panel When facing the operator with the concavo-convex surface facing the operator side, the capacitive touch panel can be provided with antiglare properties and can prevent glare of the ultra-high-definition display element. Can prevent a decrease in resolution of an ultra-high-definition display element. In addition, this usage is preferable in that it is difficult to see the scratches on the surface of the touch panel, the conductive film, and the like, and the shape of the electrode pattern.
  • the capacitive touch panel has a configuration in which an X-axis electrode is formed on a transparent substrate, a Y-axis electrode is formed on another transparent substrate, and laminated via an adhesive or the like, at least one transparent substrate
  • the same effect as described above can be obtained even when an optical sheet including an optical sheet described later is used and the uneven surface of the optical sheet is directed toward the operator.
  • an optical sheet described later is used as the transparent substrate of the capacitive touch panel so that the concavo-convex surface faces away from the operator, it is suitable in that it can prevent glare and prevent adhesion and interference fringes. It is.
  • the optical sheet used in the touch panel of the present invention has a concavo-convex shape on the surface and satisfies the above conditions A-1 and A-2 or satisfies the above conditions B-1 and B-2.
  • the optical sheet may satisfy the above conditions A-1 and A-2, or may satisfy the above conditions B-1 and B-2, but the above conditions A-1 and A-2, and the above condition B- It is preferable to satisfy 1 and B-2.
  • ⁇ SRa in condition A-1 indicates the degree of variation in the three-dimensional arithmetic average roughness SRa in each measurement region of 64 ⁇ m square. Since the size of 64 ⁇ m square corresponds to the size of the pixel of the color filter, if the unevenness varies for each region, unevenness in brightness tends to occur due to interference with the color filter. Therefore, by setting ⁇ SRa to 0.050 ⁇ m or less, luminance unevenness due to interference between the pixels of the color filter and the uneven layer is reduced, and glare can be easily prevented.
  • ⁇ SRa is preferably 0.040 ⁇ m or less, and more preferably 0.030 ⁇ m or less.
  • SRa AVE in Condition A-2 indicates the degree of roughness of the uneven shape of the optical sheet.
  • SRa AVE is preferably 0.110 ⁇ m or more, and more preferably 0.115 ⁇ m. If SRa AVE is too large, the resolution and contrast tend to decrease.
  • SRa AVE is preferably 0.300 ⁇ m or less, more preferably 0.200 ⁇ m or less, and further preferably 0.175 ⁇ m or less.
  • SRa is a value with a cutoff value of 0.8 mm.
  • C 0.125 , C 0.25 , C 0.5 , C 1.0 and C 2.0 are considered to be affected by the inclination angle of the unevenness.
  • C 0.125 is an inclination angle of level 1 or higher
  • C 0.25 is an inclination angle of level 2 or higher
  • C 0.5 is affected by a tilt angle of level 3 or higher
  • C 1.0 is affected by a tilt angle of level 4 or higher
  • C 2.0 is affected by a tilt angle of level 5 or higher. It is conceivable that.
  • Satisfying the condition B-1 indicates that the amounts of the tilt angle of level 1 or higher, the tilt angle of level 2 or higher, the tilt angle of level 3 or higher, and the tilt angle of level 4 or higher are substantially constant. In other words, satisfying the condition B-1 means that the unevenness of the optical sheet has almost no inclination angle of level 3 or less, and most of the inclination angles are level 4. If it is assumed that there is no large difference in surface roughness, by setting most inclination angles of the unevenness of the optical sheet to level 4, unevenness of the unevenness in the surface of the optical sheet is reduced, and glare is prevented. It can be easily done.
  • the difference in condition B-1 is more preferably within 5.5%, and even more preferably within 4.0%.
  • Satisfying condition B-2 means that the ratio of the inclination angle of level 5 or higher is small with respect to the inclination angles of levels 1 to 4. If the angle of inclination is large, the effect on glare will increase, and if it is level 5 or higher, the tendency will be conspicuous. Therefore, it is considered that glare can be easily prevented by satisfying Condition B-2 (reducing the ratio of the inclination angle of level 5 or higher). Furthermore, it is considered that the resolution can be improved by satisfying the condition B-2 and reducing the ratio of the inclination angle of level 5 or higher.
  • satisfying the conditions B-1 and B-2 at the same time ensures that most tilt angles are at level 4, ensuring various performances imparted by uneven shapes such as anti-glare properties, adhesion prevention properties and interference fringe prevention properties.
  • uneven shapes such as anti-glare properties, adhesion prevention properties and interference fringe prevention properties.
  • the difference in Condition B-2 is more preferably 11.0% or more, and further preferably 11.5% or more.
  • the condition B-2 is preferably 20.0% or less.
  • the conditions A-1 and A-2 or the conditions B-1 and B-2 are satisfied over almost the entire area of the optical sheet.
  • the reason why the substantially entire area is defined is that the end of the optical sheet may cause a minute defect at the time of cutting or the like, and even if the end has a defect, it is difficult for the viewer to recognize it as a defect.
  • the periphery of the end of the optical sheet is a region that is difficult to visually recognize.
  • the conditions A-1 and A-2 or the conditions B-1 and B-2 are satisfied in 95% or more of the area excluding 10 mm from the ends of the four sides of the optical sheet. It is more preferable to satisfy 97% or more, and it is more preferable to satisfy 99% or more of the region.
  • Condition B-3 C 0.125 is 30.0% or more.
  • Condition B-4 C 2.0 is 40.0% or more.
  • C 0.125 is more preferably 35.0% or more, and further preferably 40.0% or more.
  • C 0.125 is preferably 50.0% or less in order to improve various properties imparted by the uneven shape such as antiglare property, adhesion prevention property and interference fringe prevention property.
  • C 2.0 is more preferably 50.0% or more, and further preferably 55.0% or more.
  • C 2.0 is preferably 70.0% or less in order to improve various properties imparted by uneven shapes such as antiglare property, adhesion prevention property, and interference fringe prevention property.
  • each measurement region is preferably continuous in two directions, ie, the X direction and the Y direction orthogonal thereto.
  • the total number of measurement regions is 100
  • the three-dimensional roughness curved surface is preferably measured using an interference microscope for simplicity. Examples of such an interference microscope include “New View” series manufactured by Zygo. SRa can be calculated by the measurement / analysis application software “MetroPro” attached to the above-described interference microscope “New View” series.
  • the optical sheet used in the touch panel of the present invention can improve the glare prevention property under the above-described conditions, it is not necessary to increase the noise to the inside more than necessary, and the resolution of the ultra-high-definition display element can be prevented from being lowered. it can.
  • the optical sheet preferably has a total light transmittance of JIS K7361-1: 1997 of 80% or more, more preferably 85% or more, and further preferably 90% or more.
  • the optical sheet preferably has a haze of JIS K7136: 2000 of 25 to 60%, more preferably 30 to 60%, and further preferably 30 to 50%.
  • a haze of JIS K7136 2000 of 25 to 60%, more preferably 30 to 60%, and further preferably 30 to 50%.
  • the surface haze is preferably 5 to 25%, more preferably 5 to 20%, and more preferably 7 to 15%. More preferably.
  • the internal haze is preferably 15 to 40%, more preferably 20 to 40%, and further preferably 25 to 38%.
  • the ratio of surface haze to internal haze is preferably 0.1 to 0.5 from the viewpoint of the balance between the effects of surface haze and internal haze described above, and is preferably 0.2 to 0.2. More preferably, it is from 0.4.
  • the surface haze and internal haze can be determined by, for example, the method described in Examples.
  • the optical sheet described above is particularly limited as long as it has a concavo-convex shape on at least one surface and satisfies the conditions A-1 and A-2 or the conditions B-1 and B-2. Can be used without
  • the concave and convex shape may be provided on both surfaces of the optical sheet, but from the viewpoint of handling properties and image visibility (resolution, whitening), the concave and convex shape is provided on one side, and the other surface is substantially smooth (Ra0). 0.02 ⁇ m or less).
  • the optical sheet may be a single layer of a concavo-convex layer or a multilayer having a concavo-convex layer on a transparent substrate. From the viewpoint of ease of handling and manufacturing, a configuration having an uneven layer on a transparent substrate is preferable.
  • Examples of the method for forming irregularities include 1) a method using an embossing roll, 2) an etching process, 3) molding by a mold, 4) formation of a coating film by coating, and the like.
  • the molding by the mold 3) is preferable from the viewpoint of reproducibility of the uneven shape
  • the formation of the coating film by the coating of 4) is preferable from the viewpoint of productivity and a variety of products.
  • Molding with a mold is performed by producing a mold having a shape complementary to the concave and convex surface, pouring a material constituting the concave and convex layer such as a polymer resin or glass into the mold and curing it, and then removing the mold from the mold. be able to.
  • a transparent substrate is used, a polymer resin or the like is poured into a mold, and after overlaying the transparent substrate on the mold, the polymer resin or the like is cured, and the entire transparent substrate is taken out from the mold. be able to.
  • Formation of a coating film by coating is performed by applying an uneven layer forming coating solution containing a binder resin and particles on a transparent substrate by a known coating method such as gravure coating and bar coating, and drying as necessary. It can be formed by curing.
  • a coating method such as gravure coating and bar coating, and drying as necessary. It can be formed by curing.
  • variation in the surface shape of the concavo-convex layer can be reduced by containing different kinds of particles in the concavo-convex layer.
  • FIG. 3 is a scanning transmission electron micrograph showing a cross-section of the concavo-convex layer of the optical sheet of Example 1 formed by coating a concavo-convex layer-forming coating solution containing a binder resin, organic particles, and inorganic fine particles.
  • STEM scanning transmission electron micrograph
  • Examples of the organic particles include a spherical shape, a disk shape, a rugby ball shape, and an indefinite shape, and examples thereof include hollow particles, porous particles, and solid particles. Among these, spherical solid particles are preferable from the viewpoint of preventing glare.
  • Examples of the organic particles include particles composed of polymethyl methacrylate, acrylic-styrene copolymer, melamine resin, polycarbonate, polystyrene, polyvinyl chloride, benzoguanamine-melamine-formaldehyde condensate, silicone resin, fluorine resin, polyester, and the like. .
  • the organic particles are preferably non-hydrophilic treatment organic particles whose surface is not hydrophilized.
  • Silica fine particles which are representative examples of inorganic fine particles, have a high degree of hydrophilicity. Therefore, by using non-hydrophilic treatment organic particles, the organic particles and silica are not concentrated in the uneven layer (for example, around the organic particles). This is because the dispersion of the surface of the concavo-convex layer is easy to reduce.
  • organic particles acrylic-styrene copolymer particles and polystyrene particles are preferable, and polystyrene particles are more preferable.
  • the surface shape of the concavo-convex layer is considered to have less variation.
  • the polystyrene particles have a strong degree of hydrophobicity, it is considered that the polystyrene particles are uniformly dispersed in the uneven layer without being densely mixed with silica fine particles, which are representative examples of inorganic fine particles, and the surface shape of the uneven layer is less likely to vary.
  • the acrylic-styrene copolymer particles are good in that the internal haze and the aggregation / dispersion can be easily controlled because the refractive index and the degree of hydrophilicity / hydrophobicity can be easily controlled.
  • [specific gravity of organic particles / specific gravity of a mixture of binder resin and inorganic fine particles] is less than 1.0.
  • the organic particles preferably have an average particle diameter of 2 to 10 ⁇ m, and more preferably 3 to 8 ⁇ m, from the viewpoint of reducing variations in the surface shape of the uneven layer.
  • the ratio of the average particle diameter of the organic particles to the thickness of the concavo-convex layer is 0.4 to 0.00 from the viewpoint of reducing the variation in the surface shape of the concavo-convex layer. 8 is preferable, and 0.5 to 0.7 is more preferable.
  • the average particle diameter of the organic particles can be calculated by the following operations (1) to (3).
  • a transmission observation image of the optical sheet of the present invention is taken with an optical microscope. The magnification is preferably 500 to 2000 times.
  • (2) Ten arbitrary particles are extracted from the observed image, the major axis and minor axis of each particle are measured, and the particle diameter of each particle is calculated from the average of the major axis and minor axis.
  • the major axis is the longest diameter on the screen of individual particles.
  • the minor axis is a distance between two points where a line segment perpendicular to the midpoint of the line segment constituting the major axis is drawn and the perpendicular line segment intersects the particle.
  • the same operation is performed five times on the observation image of another screen of the same sample, and the value obtained from the number average of the particle diameters for a total of 50 particles is taken as the average particle diameter of the organic particles.
  • the cross section of the optical sheet of the present invention is imaged by TEM or STEM. After imaging, the average primary particle diameter of the inorganic fine particles and the average particle diameter of the aggregates of the inorganic fine particles can be calculated by performing the same method as in the above (2) and (3).
  • the acceleration voltage of TEM or STEM is preferably 10 kv to 30 kV, and the magnification is preferably 50,000 to 300,000 times.
  • the content of the organic particles is preferably 2 to 25% by mass, and preferably 5 to 20% by mass, based on the total solid content forming the uneven layer, from the viewpoint of reducing variation in the surface shape of the uneven layer. More preferably, it is 6 to 12% by mass.
  • the inorganic fine particles include fine particles made of silica, alumina, zirconia, titania and the like. Since the inorganic fine particles are uniformly distributed in the concavo-convex layer, the unevenness of the surface shape of the concavo-convex layer can be easily reduced. In addition, it is preferable that the inorganic fine particles form aggregates in the uneven layer, and the aggregates are sparsely distributed. By forming the aggregates of the inorganic fine particles, the effect of reducing the variation in the surface shape becomes larger, and the influence of diffusion by the inorganic fine particles can be reduced by the sparse distribution of the aggregates. Among the inorganic fine particles, silica fine particles are preferable from the viewpoint of transparency and the viewpoint of reducing variation in the surface shape of the uneven layer.
  • “Uniformly distributed in the concavo-convex layer” means an arbitrary cross section 10 from a portion where organic particles in the thickness direction of the concavo-convex layer are not observed with a transmission electron microscope such as TEM or STEM at a magnification of 10,000 times.
  • TEM transmission electron microscope
  • the area ratio of the silica fine particles in the observation area of 5 ⁇ m square in each cross section was measured, the average value was M, and the standard deviation was S, and S / M ⁇ 0.1. It means that there is.
  • “Agglomerates are sparsely distributed in the concavo-convex layer” means that the inorganic fine particles are locally distributed unevenly. When observed in the same manner as described above, 0 is not observed in each cross section.
  • FIG. 3 is a cross-sectional STEM photograph of the optical sheet of Example 1, in which the lower light-colored region is the base material, and the dark-colored belt-like region at the upper part of the base material is the cross-section of the uneven layer.
  • the portions observed in black spots are aggregates of inorganic fine particles (silica fine particles), and the aggregates of silica fine particles are uniformly dispersed in the concavo-convex layer.
  • the area ratio of the aggregates of inorganic fine particles can be calculated using, for example, image analysis software.
  • the inorganic fine particles are preferably surface-treated.
  • the surface treatment of the inorganic fine particles makes it easy to appropriately control the distribution of the inorganic fine particles in the uneven layer. Moreover, the chemical resistance and saponification resistance of the inorganic fine particles themselves can be improved.
  • “Mn” indicating the area ratio of the inorganic fine particles in the region outside the organic fine particles within the circumference of 500 nm and excluding the organic fine particles, and the organic fine particles
  • “Mf” indicating the area ratio of the inorganic fine particles in a region outside the circumference from 500 nm outside satisfies the relationship of Mf / Mn ⁇ 1.0.
  • Mn and Mf can be calculated by observing a cross section in which organic particles in the thickness direction of the concavo-convex layer are observed with a transmission electron microscope such as TEM or STEM at a magnification of 10,000 times.
  • the surface treatment is preferably a hydrophobization treatment that makes the surface of the inorganic fine particles hydrophobic.
  • the hydrophobic treatment include a method of treating inorganic fine particles with a silane compound having an acrylic group such as a methyl group or an octyl group.
  • a silane compound having an acrylic group such as a methyl group or an octyl group.
  • there are hydroxyl groups (silanol groups) on the surface of the silica fine particles but the surface treatment reduces the number of hydroxyl groups on the surface of the silica fine particles, and prevents the silica fine particles from aggregating excessively. It can suppress that a silica fine particle disperse
  • silica fine particles are used as the inorganic fine particles, amorphous silica is preferable in order to suppress excessive aggregation.
  • the silica fine particle is crystalline silica, the Lewis acidity of the silica fine particle becomes strong due to lattice defects contained in the crystal structure, and the silica fine particle may agglomerate excessively.
  • fumed silica is preferably used because it tends to aggregate itself and easily forms an aggregate having a particle diameter range described below.
  • Fumed silica refers to amorphous silica having a particle size of 200 nm or less prepared by a dry method, and is obtained by reacting a volatile compound containing silicon in a gas phase.
  • Fumed silica can be produced by, for example, hydrolyzing a silicon compound such as SiCl 4 in a flame of oxygen and hydrogen, and examples thereof include AEROSIL R805 (manufactured by Nippon Aerosil Co., Ltd.).
  • the content of the inorganic fine particles is not particularly limited, but is preferably 1.0 to 15.0% by mass, more preferably 2.0 to 10.0% by mass based on the total solid content forming the uneven layer. More preferably, the content is 3.0 to 8.0% by mass.
  • the ratio of the content of organic particles and inorganic fine particles in the uneven layer is 0.5 to 0.5 from the viewpoint of easily reducing variation in the surface shape of the uneven layer. It is preferably 2.5, and more preferably 0.8 to 2.2.
  • the inorganic fine particles preferably have an average primary particle diameter of 1 to 100 nm.
  • the average primary particle diameter is 1 nm or more, it becomes easy to form an appropriate aggregate, and by setting it to 100 nm or less, it is possible to suppress a decrease in contrast due to light diffusion and an excessive increase in noise.
  • a more preferred lower limit is 5 nm, a more preferred upper limit is 50 nm, and a still more preferred upper limit is 20 nm.
  • the agglomerates of silica fine particles preferably form a structure connected in an arbitrary direction as shown in the cross-sectional electron micrograph of FIG.
  • the structure in which silica fine particles are connected in an arbitrary direction is, for example, a structure in which silica fine particles are continuously connected in a straight line (linear structure), a structure in which a plurality of the linear structures are intertwined, or the above linear structure. Any structure such as a branched structure having one or more side chains in which a plurality of silica fine particles are continuously formed can be used.
  • fumed silica In order to form an aggregate in which silica fine particles are continuous in an arbitrary direction as described above, it is preferable to use fumed silica.
  • the aggregate of inorganic fine particles preferably has an average particle diameter of 100 nm to 1 ⁇ m.
  • the more preferable lower limit of the average particle diameter of the aggregate is 200 nm, and the more preferable upper limit is 800 nm.
  • the binder resin of the concavo-convex layer preferably includes a thermosetting resin composition or an ionizing radiation curable resin composition, and more preferably includes an ionizing radiation curable resin composition from the viewpoint of improving mechanical strength. Of these, it is more preferable to include an ultraviolet curable resin composition.
  • the thermosetting resin composition is a composition containing at least a thermosetting resin, and is a resin composition that is cured by heating.
  • the thermosetting resin include acrylic resin, urethane resin, phenol resin, urea melamine resin, epoxy resin, unsaturated polyester resin, and silicone resin.
  • a curing agent is added to these curable resins as necessary.
  • the ionizing radiation curable resin composition is a composition containing a compound having an ionizing radiation curable functional group (hereinafter also referred to as “ionizing radiation curable compound”).
  • ionizing radiation curable compound examples include an ethylenically unsaturated bond group such as a (meth) acryloyl group, a vinyl group, and an allyl group, an epoxy group, and an oxetanyl group.
  • a compound having an ethylenically unsaturated bond group is preferable, a compound having two or more ethylenic unsaturated bond groups is more preferable, and among them, having two or more ethylenically unsaturated bond groups, Polyfunctional (meth) acrylate compounds are more preferred.
  • the polyfunctional (meth) acrylate compound any of a monomer and an oligomer can be used. In the present specification, “(meth) acrylate” refers to methacrylate and acrylate.
  • ionizing radiation means an electromagnetic wave or charged particle beam having an energy quantum capable of polymerizing or cross-linking molecules, and usually ultraviolet (UV) or electron beam (EB) is used.
  • electromagnetic waves such as X-rays and ⁇ -rays
  • charged particle beams such as ⁇ -rays and ion beams can also be used.
  • the ionizing radiation curable resin composition preferably contains 50% by mass or more, more preferably 60% by mass or more of a polyfunctional (meth) acrylate compound that does not contain a hydroxyl group in the molecule.
  • a polyfunctional (meth) acrylate compound that does not contain a hydroxyl group in the molecule.
  • Examples of the polyfunctional (meth) acrylate compound containing no hydroxyl group in the molecule include pentaerythritol tetraacrylate (PETTA), 1,6-hexanediol diacrylate (HDDA), dipropylene glycol diacrylate (DPGDA), Tripropylene glycol diacrylate (TPGDA), PO-modified neopentyl glycol diacrylate, tricyclodecane dimethanol diacrylate, trimethylolpropane triacrylate (TMPTA), trimethylolpropane ethoxytriacrylate, dipentaerythritol hexaacrylate (DPHA), Examples include pentaerythritol ethoxytetraacrylate and ditrimethylolpropane tetraacrylate. Of these, pentaerythritol tetraacrylate (PETTA) is preferably used.
  • ionizing radiation curable compounds include compounds having one unsaturated bond such as ethyl (meth) acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone, and trimethylolpropane tri (meth) acrylate.
  • Tripropylene glycol di (meth) acrylate diethylene glycol di (meth) acrylate, pentaerythritol tri (meth) acrylate, dipentaerythritol hexa (meth) acrylate, 1,6-hexanediol di (meth) acrylate, neopentyl glycol di (Meth) acrylate, trimethylolpropane tri (meth) acrylate, ditrimethylolpropane tetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, di Entaerythritol penta (meth) acrylate, tripentaerythritol octa (meth) acrylate, tetrapentaerythritol deca (meth) acrylate, isocyanuric acid tri (meth) acrylate, isocyanuric acid di (meth) acrylate
  • polyester resins having unsaturated double bonds polyether resins, acrylic resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins. Etc. can also be used.
  • the ionizing radiation curable compound when the ionizing radiation curable compound is an ultraviolet curable compound, the ionizing radiation curable composition preferably contains additives such as a photopolymerization initiator and a photopolymerization accelerator.
  • a photopolymerization initiator include one or more selected from acetophenone, benzophenone, ⁇ -hydroxyalkylphenone, Michler's ketone, benzoin, benzylmethyl ketal, benzoylbenzoate, ⁇ -acyloxime ester, thioxanthones and the like.
  • These photopolymerization initiators preferably have a melting point of 100 ° C. or higher. By setting the melting point of the photopolymerization initiator to 100 ° C.
  • the photopolymerization initiator remaining during the formation of the transparent conductive film of the touch panel or the heat of the crystallization process is sublimated, and the low resistance of the transparent conductive film is impaired. Can be prevented.
  • the photopolymerization accelerator can reduce polymerization inhibition by air during curing and increase the curing speed. For example, p-dimethylaminobenzoic acid isoamyl ester, p-dimethylaminobenzoic acid ethyl ester, etc. One or more selected may be mentioned.
  • the thickness of the concavo-convex layer is preferably 2 to 10 ⁇ m, and more preferably 5 to 8 ⁇ m, from the viewpoint of curling suppression, a balance with mechanical strength, hardness and toughness.
  • the thickness of the concavo-convex layer can be calculated, for example, by measuring the thickness at 20 locations from a cross-sectional image taken using a scanning transmission electron microscope (STEM) and calculating the average value of the 20 locations.
  • the acceleration voltage of STEM is preferably 10 kv to 30 kV, and the magnification is preferably 1000 to 7000 times.
  • a solvent is usually used in order to adjust the viscosity and to dissolve or disperse each component. Since the surface state of the concavo-convex layer after coating and drying differs depending on the type of the solvent, it is preferable to select the solvent in consideration of the saturated vapor pressure of the solvent, the permeability of the solvent into the transparent substrate, and the like.
  • the solvent is, for example, ketones (acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.), ethers (dioxane, tetrahydrofuran, etc.), aliphatic hydrocarbons (hexane, etc.), alicyclic hydrocarbons.
  • ketones acetone, methyl ethyl ketone, methyl isobutyl ketone, cyclohexanone, etc.
  • ethers dioxane, tetrahydrofuran, etc.
  • aliphatic hydrocarbons hexane, etc.
  • alicyclic hydrocarbons alicyclic hydrocarbons.
  • the solvent preferably contains a predetermined amount of a solvent having a high polarity and a high volatilization rate.
  • a solvent having a high polarity and a high volatilization rate is volatilized before other solvents, the hydrophobicity around the organic fine particles becomes strong at the time of coating film formation.
  • a solvent having a high polarity means a solvent having a solubility parameter of 10 [(cal / cm 3 ) 1/2 ] or more
  • a solvent having a high volatilization rate means a relative evaporation rate of 150. The above solvents are meant.
  • the solubility parameter is calculated by the method of Fedors.
  • the Fedors method is described, for example, in “SP Value Basics / Applications and Calculation Methods” (Hideki Yamamoto, published by Information Technology Corporation, 2005).
  • Ecoh is the cohesive energy density
  • V is the molar molecular volume.
  • the solubility parameter can be calculated by obtaining ⁇ E coh and ⁇ V, which is the sum of E coh and V.
  • the solvent having a high polarity and a high volatilization rate examples include ethanol and isopropyl alcohol. Among them, isopropyl alcohol is preferable. Further, the content of the solvent having high polarity and fast volatilization rate is preferably 10 to 40% by mass of the total solvent. By setting the amount to 10% by mass or more, excessive aggregation of the inorganic fine particles can be easily suppressed, and by setting the amount to 40% by mass or less, the leveling property of the concavo-convex layer forming coating liquid is increased because the volatilization of the solvent is too fast. The shortage can be suppressed.
  • the drying conditions can be adjusted by the drying temperature and the wind speed in the dryer. Specifically, the drying temperature is preferably 30 to 120 ° C. and the drying air speed is preferably 0.2 to 50 m / s. In order to control the leveling of the concavo-convex layer according to the drying conditions, it is preferable that the irradiation with ionizing radiation is performed after drying.
  • the leveling agent include a fluorine-based or silicone-based one, and a fluorine-based leveling agent that easily suppresses occurrence of a Benard cell structure in the uneven layer is preferable.
  • the amount of the leveling agent added is preferably 0.01 to 0.5% by weight, more preferably 0.05 to 0.2% by weight, based on the total solid content of the coating liquid for forming an uneven layer.
  • corrugated layer forming coating liquid is a step of (1) mixing and dispersing an inorganic fine particle in the intermediate composition after the step of preparing the intermediate composition by mixing and stirring the binder resin and organic particles in the solvent. It is preferable to prepare by performing.
  • the concavo-convex layer forming coating solution as described above, it is possible to easily suppress variations in the surface shape of the concavo-convex layer.
  • the inorganic fine particles are preferably an inorganic fine particle dispersion dispersed in a solvent.
  • the transparent base material of the optical sheet it is preferable that it has light transmission, smoothness and heat resistance and is excellent in mechanical strength.
  • Such transparent substrates include polyester, triacetyl cellulose (TAC), cellulose diacetate, cellulose acetate butyrate, polyamide, polyimide, polyether sulfone, polysulfone, polypropylene, polymethylpentene, polyvinyl chloride, polyvinyl acetal.
  • plastic films such as polyether ketone, polymethyl methacrylate, polycarbonate, polyurethane and amorphous olefin (Cyclo-Olefin-Polymer: COP).
  • the transparent substrate may be a laminate of two or more plastic films.
  • polyester polyethylene terephthalate, polyethylene naphthalate
  • TAC and acrylic are suitable from the viewpoint of optical transparency and optical transparency.
  • TAC and acrylic are easily dissolved by a solvent, and the dissolved TAC component and acrylic component flow into the uneven layer and have an effect of pushing up organic particles having a small specific gravity. That is, it is considered that by using TAC or acrylic as the transparent substrate, the organic particles are less likely to sink in the concavo-convex layer, and variations in the surface shape of the concavo-convex layer are likely to be reduced.
  • COP and polyester are suitable in that they are excellent in weather resistance.
  • a plastic film having a retardation value of 3000 to 30000 nm or a plastic film having a 1 ⁇ 4 wavelength retardation can prevent unevenness of different colors from being observed on the display screen when an image on a liquid crystal display is observed through polarized sunglasses. This is preferable in terms of points.
  • the thickness of the transparent substrate is preferably 5 to 300 ⁇ m, more preferably 30 to 200 ⁇ m.
  • the surface of the transparent substrate may be preliminarily coated with a coating called an anchor agent or a primer in addition to physical treatment such as corona discharge treatment and oxidation treatment.
  • the optical sheet may have a functional layer such as an antireflection layer, an antifouling layer, or an antistatic layer on the uneven shape and / or on the surface opposite to the uneven shape.
  • a functional layer may be provided between the transparent base material and the concavo-convex layer in addition to the above location.
  • the touch panel of the present invention can improve glare prevention properties while imparting various properties such as anti-glare properties.
  • using an optical sheet as the surface member of the touch panel and arranging the optical sheet so that the surface on the concave-convex shape side is the surface is preferable in that it is easy to impart antiglare properties while suppressing a decrease in contrast. It is.
  • the display device of the present invention is a display device having an optical sheet on the front surface of a display element having a pixel density of 300 ppi or more, wherein the optical sheet has a concavo-convex shape on the surface, and the optical sheet has the above conditions. Either A-1 and A-2 are satisfied, or the above conditions B-1 and B-2 are satisfied.
  • An ultra-high-definition display element having a pixel density of 300 ppi or more is likely to cause glare as described above, but in the present invention, various characteristics such as anti-glare properties can be obtained by using a specific optical sheet as the optical sheet having an uneven shape. Glittering can be prevented while imparting.
  • the optical sheet used for the display device of the present invention the same optical sheet as used for the touch panel of the present invention described above can be used.
  • Examples of the display element include a liquid crystal display element, an in-cell touch panel liquid crystal display element, an EL display element, and a plasma display element.
  • the in-cell touch panel liquid crystal element is a liquid crystal element in which a liquid crystal is sandwiched between two glass substrates, and a touch panel function such as a resistive film type, a capacitance type, and an optical type is incorporated therein.
  • Examples of the liquid crystal display method of the in-cell touch panel liquid crystal element include an IPS method, a VA method, a multi-domain method, an OCB method, an STN method, and a TSTN method.
  • In-cell touch panel liquid crystal elements are described in, for example, Japanese Patent Application Laid-Open Nos. 2011-76602 and 2011-222009.
  • the optical sheet can be installed on the front surface of the display element in the following order, for example.
  • (A) Display element / surface protective plate / optical sheet (b) display element / optical sheet (c) display element / touch panel having optical sheet as constituent member (d) display element / optical sheet / surface protective plate (a) and
  • (b) it can be provided with anti-glare properties and can prevent glare by arranging so that the uneven surface of the optical sheet faces the surface (so that the uneven surface faces the side opposite to the display element), Furthermore, it is possible to make it difficult to see the scratches on the surface and the display element.
  • glare can be prevented while providing various characteristics such as anti-glare properties by arranging the optical sheet as in the embodiment of the touch panel of the present invention described above.
  • the concave and convex surface of the optical sheet is arranged through the air layer so as to face the display element side, adhesion and interference fringes can be prevented and scratches generated in the display element can be prevented. It can be difficult to see.
  • Mobile information terminals represented by recent smartphones are often used outdoors. For this reason, it is preferable to use the display device of the present invention so that an optical sheet is disposed on the outermost surface of the display device and the concavo-convex surface faces the surface side (the side opposite to the display element).
  • the optical sheet of the present invention is an optical sheet having a concavo-convex shape on the surface, and the optical sheet satisfies the conditions A-1 and A-2 or the conditions B-1 and B-2. Used for the front surface of a display element having a pixel density of 300 ppi or more.
  • optical sheet of the present invention examples include the same optical sheets used for the touch panel of the present invention described above.
  • the optical sheet of the present invention is used on the front surface of a display element having a pixel density of 300 ppi or more to prevent glare of image light and a decrease in resolution of an ultra-high-definition display element while providing various properties such as anti-glare properties. It is preferable in that it can be performed. Mobile information terminals represented by recent smartphones are often used outdoors. For this reason, it is preferable to use the optical sheet of the present invention so that the uneven surface faces the surface side (the side opposite to the display element) on the outermost surface of the touch panel or the display device.
  • the optical sheet selecting method of the present invention is a method for selecting an optical sheet having a concavo-convex shape on the surface, which satisfies the above conditions A-1 and A-2, or satisfies the above conditions B-1 and B-2
  • the optical sheet used for the front surface of the display element having a pixel density of 300 ppi or more is selected as an optical sheet.
  • an optical sheet having good antiglare property can be selected when used for an ultra-high-definition display element having a pixel density of 300 ppi or more, without incorporating an optical sheet in a display device. It is possible to efficiently control the quality of the optical sheet.
  • the determination conditions for selecting the optical sheet are the above conditions A-1 and A-2 or the above conditions B-1 and B-2.
  • the determination conditions for selecting the optical sheet preferably include the above conditions A-1 and A-2 and the above conditions B-1 and B-2 as essential conditions.
  • the numerical range of each condition is preferably a preferable numerical range of the optical sheet described above.
  • the determination condition of Condition A-1 is preferably that ⁇ SRa is 0.040 ⁇ m or less.
  • the conditions B-1 and B-2 are included as the determination conditions, it is preferable that the following conditions B-3 and B-4 are further set as the determination conditions from the viewpoint of selecting an optical sheet that can prevent glare more accurately. Further, when the conditions A-1 and A-2 are included as the determination conditions, and when the conditions B-1 and B-2 are included as the determination conditions, from the viewpoint of selecting an optical sheet that can prevent glare more accurately, The following condition C-1 is preferably set as the determination condition. Note that the numerical ranges of the conditions B-3, B-4, and C-1 are preferably the preferable numerical ranges of the optical sheet described above.
  • Condition B-3 C 0.125 is 30.0% or more.
  • Condition B-4 C 2.0 is 40.0% or more.
  • Condition C-1 The inner depth of the optical sheet is 15 to 40%.
  • the method for producing an optical sheet of the present invention is a method for producing an optical sheet having a concavo-convex shape on the surface, wherein the optical sheet satisfies the above conditions A-1 and A-2, or the above condition B-1 And B-2, a method for producing an optical sheet used for the front surface of a display element having a pixel density of 300 ppi or more.
  • an optical sheet of the present invention it is possible to efficiently produce an optical sheet capable of imparting various properties such as anti-glare properties and preventing glare of image light of an ultra-high definition display element having a pixel density of 300 ppi or more. it can.
  • each condition is preferably a preferable numerical range of the optical sheet described above.
  • ⁇ SRa is preferably 0.040 ⁇ m or less.
  • the production conditions are controlled so as to satisfy the above conditions B-1 and B-2, it is preferable to further control the production conditions so as to satisfy the above conditions B-3 and B-4. Further, when the conditions A-1 and A-2 are included in the control of the manufacturing conditions, and when the conditions B-1 and B-2 are included in the control of the manufacturing conditions, the manufacturing conditions are set so as to further satisfy the condition C-1. Is preferably controlled.
  • Conditions A-1, A-2, and B-1 to B-4 can be controlled by reducing variations in the surface shape of the uneven layer.
  • the specific means for controlling the conditions A-1, A-2, and B-1 to B-4 may be to control the shape of the mold when the uneven layer is formed by a mold.
  • Specific means for controlling the conditions A-1, A-2, B-1 to B-4 when forming the uneven layer by coating are organic particles, inorganic fine particles, binder resin, leveling agent, solvent and drying. It is mentioned that the conditions are the above-described preferred embodiments.
  • Condition C-1 can be controlled by an internal diffusion element.
  • the internal diffusion element can be controlled by adjusting the refractive index of the binder resin, the shape of the organic particles, the particle diameter of the organic particles, the addition amount of the organic particles, the refractive index of the organic particles, and the like.
  • the concentration of materials (inorganic fine particles) other than the organic particles added to the binder resin also affects the internal diffusion element.
  • optical sheet 1-1.
  • Uneven shape of optical sheet ⁇ SRa> The optical sheet obtained in Examples and Comparative Examples is attached to a glass plate through a transparent adhesive on the surface opposite to the surface on which the concavo-convex layer is formed as a sample, and a white interference microscope (New) The surface shape of the optical sheet was measured and analyzed under the following conditions using View 7300 (manufactured by Zygo).
  • Microscope Application 8.3.2 Microscope Application was used as measurement / analysis software.
  • Transmission image definition Optical having a width of 0.125 mm, 0.25 mm, 0.5 mm, 1 mm and 2 mm according to JIS K7374 using a image clarity measuring instrument (trade name: ICM-1T) manufactured by Suga Test Instruments Co., Ltd. Five types of transmitted image clarity through the comb were measured.
  • the concavo-convex shape is crushed and flattened by attaching a TAC film of 80 ⁇ m thickness (manufactured by FUJIFILM Corporation, TD80UL) to the surface of the optical sheet via a transparent adhesive, eliminating the influence of haze caused by the surface shape. Then, the haze was measured to determine the internal haze (Hi). Then, the surface haze (Hs) was obtained by subtracting the internal haze value from the overall haze value. The light incident surface was the substrate side.
  • the distance between the CCD camera and the optical sheet was 250 mm, and the focus of the CCD camera was adjusted to match the optical sheet.
  • Images taken with a CCD camera were taken into a personal computer and analyzed with image processing software (ImagePro Plus ver. 6.2; manufactured by Media Cybernetics) as follows. First, an evaluation location of 200 ⁇ 160 pixels was selected from the captured image, and converted to a 16-bit gray scale at the evaluation location. Next, the low-pass filter was selected from the enhancement tab of the filter command, and the filter was applied under the conditions of “3 ⁇ 3, number of times 3, strength 10”. As a result, components derived from the black matrix pattern were removed. Next, flattening was selected, and shading correction was performed under the condition of “background: dark, object width 10”.
  • contrast enhancement was performed with “contrast: 96, brightness: 48” using a contrast enhancement command.
  • the obtained image was converted to an 8-bit gray scale, and the variation in the value for each pixel was calculated as a standard deviation value for 150 ⁇ 110 pixels in the image, thereby glaring was digitized. It can be said that the smaller the numerical value of the glare value, the less the glare.
  • the evaluation was performed with the black matrix having a pixel density of 350 ppi or the pixel density of 200 ppi.
  • a black acrylic plate is placed on a horizontal surface with an evaluation sample bonded via a transparent adhesive, and a fluorescent lamp is placed 1.5 m above the evaluation sample.
  • visual sensory evaluation was performed from various angles, and evaluation was performed according to the following criteria.
  • C An image of the fluorescent lamp is reflected like a mirror surface, and the outline of the fluorescent lamp (the boundary of the outline) can be clearly recognized.
  • Concavity and convexity layer forming coating solution 2 A concavo-convex layer forming coating solution 2 was obtained in the same manner as the concavo-convex layer forming coating solution 1 except that the blending amount of the organic particles in the intermediate composition was 14 parts by mass.
  • Convex layer forming coating solution 3 The concavo-convex layer forming coating is performed in the same manner as the concavo-convex layer forming coating solution 1 except that the blending amount of the organic particles in the intermediate composition is 8 parts by mass and the blending amount of fumed silica in the inorganic fine particle dispersion is 9 parts by mass. Liquid 3 was obtained.
  • Concavity and convexity layer forming coating solution 4 The organic particles in the intermediate composition are non-hydrophilic treated acrylic-styrene copolymer particles (average particle size 3.5 ⁇ m, refractive index 1.57, specific gravity 1.08, manufactured by Sekisui Plastics Co., Ltd.) and a blending amount of 12 A concavo-convex layer-forming coating solution 4 was obtained in the same manner as the concavo-convex layer-forming coating solution 1 except that the amount was in parts by mass.
  • Concavity and convexity layer forming coating solution 5 The composition shown below was dispersed with a bead mill to obtain a composition 5 for an uneven layer.
  • Organic particles non-hydrophilized polystyrene particles, average particle size 3.5 ⁇ m, refractive index 1.59, specific gravity 1.06, manufactured by Soken Chemical Co., Ltd./14 parts by mass, pentaerythritol triacrylate / 100 parts by mass, acrylic polymer ( Molecular weight 75,000, manufactured by Mitsubishi Rayon Co., Ltd./10 parts by weight, photopolymerization initiator (trade name “Irgacure 184”, manufactured by BASF Japan) / 5 parts by weight, polyether-modified silicone (trade name “TSF4460”, Momentive (Performance Materials Co., Ltd.) / 0.025 mass part / toluene / 120 mass parts / cyclohexanone / 30 mass parts
  • Concavity and convexity layer forming coating solution 6 The composition for the concavo-convex layer, except that the organic particles were non-hydrophilized acrylic-styrene copolymer particles (average particle size 3.5 ⁇ m, refractive index 1.57, specific gravity 1.08, manufactured by Sekisui Plastics Co., Ltd.) In the same manner as for Product 5, the uneven layer composition 6 was obtained.
  • a concavo-convex layer forming coating solution 1 is applied on a transparent substrate (80 ⁇ m thick triacetyl cellulose resin film, TD80UL, manufactured by Fuji Film Co., Ltd.), dried at 70 ° C. and a wind speed of 5 m / s for 30 seconds, and then irradiated with ultraviolet light in a nitrogen atmosphere. Irradiation was performed under an oxygen concentration of 200 ppm or less so that the integrated light amount was 100 mJ / cm 2 to form an uneven layer, whereby an optical sheet was obtained.
  • the film thickness of the concavo-convex layer was 6.0 ⁇ m.
  • Example 2 to 4 Optical sheets of Examples 2 to 4 were obtained in the same manner as Example 1 except that the uneven layer forming coating solution 1 was changed to the uneven layer coating solutions 2 to 4.
  • Comparative Example 1 An optical sheet of Comparative Example 1 was obtained in the same manner as in Example 1 except that the uneven layer forming coating solution 1 was changed to the uneven layer coating solution 5 and the thickness of the uneven layer was 4.5 ⁇ m.
  • Comparative Example 2 An optical sheet of Comparative Example 2 was obtained in the same manner as Comparative Example 1 except that the uneven layer forming coating solution 5 was changed to the uneven layer coating solution 6.
  • Comparative Example 3 An optical sheet of Comparative Example 3 was obtained in the same manner as Comparative Example 1 except that the uneven layer forming coating solution 5 was changed to the uneven layer coating solution 7.
  • the optical sheets of Examples 1 to 4 can impart various properties such as anti-glare properties and prevent glare in an ultra-high-definition display element having a pixel density of 300 ppi or more. It was also excellent in contrast.
  • the optical sheets of Examples 1 to 4 show a much better effect than the optical sheets of Comparative Examples 1 and 2 in terms of preventing glare of display elements with a pixel density of 350 ppi, but display with a pixel density of 200 ppi. With respect to the anti-glare performance of the element, the difference in effect from the optical sheets of Comparative Examples 1 and 2 is reduced.
  • the optical sheets of Examples 1 to 4 are extremely useful for an ultra-high-definition display element having a pixel density of 300 ppi or more.
  • the thing of the comparative example 3 is excellent in glare prevention property since it does not contain a translucent particle in an uneven
  • ITO conductive film having a thickness of 20 nm was formed by sputtering on the transparent substrate side of the optical sheets of Examples 1 to 4 and Comparative Examples 1 to 3 to form an upper electrode plate.
  • an ITO conductive film having a thickness of about 20 nm was formed by sputtering on one surface of a 1 mm thick tempered glass plate to obtain a lower electrode plate.
  • ionizing radiation curable resin Dot Cure TR5903: Taiyo Ink Co., Ltd.
  • Dot Cure TR5903 Taiyo Ink Co., Ltd.
  • Examples 1-4 and Comparative Examples 1-3 A resistive film type touch panel was prepared. The obtained resistive touch panel was placed on a commercially available ultra-high-definition liquid crystal display device (pixel density 350 ppi), and the presence or absence of glare was visually evaluated. As a result, the touch panels of Examples 1 to 4 were suppressed from glare.
  • the visibility was good with little reflection of external light.
  • the touch panels of Examples 1 to 4 did not impair the resolution of ultra-high definition images, and had good contrast in a bright room environment.
  • the touch panels of Comparative Examples 1 and 2 showed noticeable glare.
  • the touch panel of the comparative example 3 reflected external light, and visibility was not favorable.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Human Computer Interaction (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Laminated Bodies (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un panneau tactile avec lesquelles diverses caractéristiques telle qu'une caractéristique anti-éblouissement peut être prévue, et qui est susceptible d'empêcher l'éblouissement par la lumière d'image d'éléments d'affichage à ultra-haute définition ayant une densité de pixels de 300 ppi ou plus. Ce panneau tactile, qui a une feuille optique en tant qu'élément constitutif, est utilisé au niveau de la surface avant d'éléments d'affichage ayant une densité de pixels supérieure ou égale à 300 ppi, et la surface de la feuille optique a une forme irrégulière et la feuille optique satisfait les conditions suivantes A-1 et A-2, ou satisfait à une condition spécifique par rapport à la netteté d'image transmise. Condition A -1 : Lorsque la surface ayant la forme irrégulière est divisée en régions de mesure de 64 μm-carré, la rugosité moyenne arithmétique tridimensionnelle SRa est obtenue pour chaque région de mesure, et la déviation standard σSRa de la rugosité moyenne arithmétique tridimensionnelle pour la totalité des régions de mesure est calculée, la déviation standard σSRa est de 0,050 µm ou moins. Condition A -2 : Lorsque la surface ayant la forme irrégulière est divisée en régions de mesure de 64 μm-carré, la rugosité moyenne arithmétique tridimensionnelle SRa est obtenue pour chaque région de mesure, et la moyenne SRaAVE de la rugosité moyenne arithmétique tridimensionnelle pour la totalité des régions de mesure est calculée, la déviation standard SRaAVE est de 0,100 µm ou plus.
PCT/JP2016/055607 2015-02-26 2016-02-25 Panneau tactile, dispositif d'affichage, feuille optique, procédé de sélection de feuille optique et procédé de fabrication de feuille optique WO2016136871A1 (fr)

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CN201680011477.7A CN107250963B (zh) 2015-02-26 2016-02-25 触摸面板、显示装置和光学片以及光学片的选择方法和光学片的制造方法

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JP2015036589A JP6500495B2 (ja) 2015-02-26 2015-02-26 タッチパネル、表示装置及び光学シート、並びに光学シートの選別方法及び光学シートの製造方法
JP2015036582A JP6497126B2 (ja) 2015-02-26 2015-02-26 タッチパネル、表示装置及び光学シート、並びに光学シートの選別方法及び光学シートの製造方法

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KR20170122189A (ko) 2017-11-03
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