WO2009113668A1 - タッチパネル用光学部材及びその製造方法 - Google Patents
タッチパネル用光学部材及びその製造方法 Download PDFInfo
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- WO2009113668A1 WO2009113668A1 PCT/JP2009/054895 JP2009054895W WO2009113668A1 WO 2009113668 A1 WO2009113668 A1 WO 2009113668A1 JP 2009054895 W JP2009054895 W JP 2009054895W WO 2009113668 A1 WO2009113668 A1 WO 2009113668A1
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- WIPO (PCT)
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- optical member
- film
- elastic body
- visible light
- touch panel
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- 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
- G06F3/042—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by opto-electronic means
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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
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
-
- 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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
- G02F1/13312—Circuits comprising photodetectors for purposes other than feedback
-
- 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
- G02F1/13338—Input devices, e.g. touch panels
-
- 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
- G06F3/0412—Digitisers structurally integrated in a display
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
Definitions
- the present invention relates to an optical member for a touch panel and a manufacturing method thereof.
- the touch panel is an input device that can sense a position touched with a finger or a pen, and in many cases also has a function as a display device. Examples of the use of the touch panel include mobile devices such as a mobile phone and a personal digital assistant (PDA), and an automatic teller machine at a bank.
- PDA personal digital assistant
- a method for detecting the position where the touch panel is touched for example, a resistance film method, a capacitance method, and an optical sensor method are known.
- a resistive film type touch panel is generally a film in which a transparent conductive film is formed on the surface of a glass substrate placed on the screen of a display device, a minute spacer is placed thereon, and a transparent conductive film is further formed thereon. Is pasted.
- the transparent conductive films are not in contact with each other due to the spacers.
- the film is deflected by pressure and the transparent conductive films are brought into contact with each other to cause conduction.
- the touched position is detected based on the resistance change in the conductive portion.
- the resistive film method can be input with either a finger or a pen, and has the feature that the production cost can be reduced.
- the transparent conductive film is fragile, deterioration such as peeling occurs due to repeated bending when touched, resulting in low durability such as detection sensitivity, resolution loss, and reduced transmittance.
- the capacitive touch panel has a structure including a single layer of a transparent conductive film that detects capacitance. By sensing a change in the capacitively coupled electrical signal of the touched portion, the touched position can be detected.
- the capacitance method is superior in durability and transmittance as compared to the resistance film method. However, it can be operated only with a finger or a special pen having conductivity, and there is a problem that input cannot be performed with a finger wearing a glove or a non-conductive pen (Patent Document 1).
- an optical sensor having a function of sensing light is mounted on the display device.
- the presence or absence of touch is detected by the optical sensor as a change in the amount of light received.
- the display device is a liquid crystal display (LCD)
- the optical sensor is disposed in a liquid crystal cell, for example.
- a finger is placed on the touch panel, external light incident on the optical sensor is blocked by the finger, and the amount of light received by the optical sensor changes.
- the touched position is detected by this change (Patent Document 3).
- an optical sensor can be arranged in each pixel of the display device, it can be used as an image sensor and has an advantage of providing an image scanner function.
- the optical sensor type touch panel has many advantages such as durability and multipoint input.
- the present invention has been made in view of the circumstances as described above, and the object of the present invention is that there are few malfunctions even in an environment where the external light is weak, and input is possible without using a special pen.
- An object of the present invention is to provide an optical member that makes it possible to obtain a touch panel that allows input even when an image is displayed black in a liquid crystal display device.
- the present invention relates to an optical member for a touch panel provided with a film-like rubber elastic body having an uneven shape on one side or both sides.
- the optical member according to the present invention When the optical member according to the present invention is placed inside the screen of the touch panel and a predetermined position on the screen is pressed, the surface having the concavo-convex shape of the optical member is adjacent to the pressed surface. It is reversibly deformed by contact with the member. As a result, when a substance having a refractive index different from that of the optical member (rubber elastic body) is present on the surface having the concavo-convex shape, the state of the reflected light amount on the surface having the concavo-convex shape optically changes. . By detecting this optical change with an optical sensor, the pressed position can be recognized. According to this method, since light emitted from the display device is used, malfunction does not easily occur even in an environment where external light is weak.
- the backlight member can be used even in the black display state by providing the optical member inside the polarizing plate in the liquid crystal display device.
- the reflected light can be used effectively.
- “reversibly deformed” means that the deformation by the load of the mechanical pressure and the restoration by the unloading of the mechanical pressure are reversible, that is, elastic deformation.
- the maximum height of the uneven shape is preferably 0.01 to 50 ⁇ m. Thereby, the effect by this invention is exhibited notably especially.
- the optical member according to the present invention may further include an intermediate layer having a refractive index different from that of the rubber elastic body provided on the surface of the rubber elastic body having the concavo-convex shape. This makes it more resistant to environmental changes such as temperature and atmospheric pressure compared to the case where voids are formed without providing an intermediate layer between the surface having an uneven shape and an adjacent member in the touch panel. An excellent touch panel can be obtained.
- the intermediate layer preferably has adhesiveness.
- the optical member according to the present invention can be stored in the state of a laminate including, for example, a support film and an optical member provided on the support film.
- a laminate including, for example, a support film and an optical member provided on the support film.
- the present invention relates to a method for manufacturing the optical member.
- the manufacturing method according to the present invention includes a step of forming a film-like rubber elastic body having a concavo-convex shape transferred from the concavo-convex surface on the concavo-convex surface of the mold, and a step of peeling the rubber elastic body from the mold.
- the optical member according to the present invention can be efficiently manufactured with good workability.
- a touch panel that has few malfunctions even in an environment with low external light, can be input without using a special pen, and can be input even when an image is displayed black on a liquid crystal display device. It is possible to obtain.
- the function of the touch panel is expressed based on the reversible deformation of the rubber elastic body, it is possible to recognize the position with high sensitivity and accuracy, and to obtain an excellent effect in terms of resistance to repeated use. Can do.
- SYMBOLS 1 Optical member (rubber elastic body), 2 ... Air gap, 4 ... Liquid crystal cell, 20, 21 ... Polarizing plate, 22 ... Phase difference plate, 23 ... Glass substrate, 24 ... Glass substrate, 25 ... Color filter, 30, 31 ... Adhesive layer, 40, 41 ... Transparent electrode, 42, 43 ... Alignment film, 45 ... Liquid crystal layer, 47 ... Spacer, 50 ... Light-shielding film, 51 ... Thin film transistor, 52 ... Photosensor, 54 ... Insulating film, 60 ... Back Light, 100 ... touch panel, S100 ... screen.
- FIG. 1 is an end view showing an embodiment of a touch panel including an optical member.
- a touch panel 100 shown in FIG. 1 includes a liquid crystal cell 4, a backlight 60 as a light source provided on one side of the liquid crystal cell 4, an optical member 1 provided on the other side of the liquid crystal cell 4, and a liquid crystal cell. 4 is mainly provided with an optical sensor 52 provided in 4 and a pair of polarizing plates 20 and 21 disposed to face each other with the liquid crystal cell 4 and the optical member 1 interposed therebetween.
- the liquid crystal cell 4 covers the two glass substrates 23 and 24 arranged opposite to each other, the thin film transistor 51 and the optical sensor 52 provided on the glass substrate 24 on the backlight 60 side, and the thin film transistor 51 and the optical sensor 52.
- the insulating film 54 includes a transparent electrode 41, an alignment film 43, a liquid crystal layer 45, an alignment film 42, and a transparent electrode 40 stacked on the insulating film 54.
- a light shielding film 50 is provided between the glass substrate 24, the thin film transistor 51, and the optical sensor 52.
- a spacer 47 is provided between the alignment film 42 and the alignment film 43.
- the adhesion layer 31, the optical member 1, the adhesion layer 30, the phase difference plate 22, and the polarizing plate 20 are laminated in this order.
- the touch panel 100 shown in FIG. 1 is an input device having a function as a liquid crystal display device and a function of detecting a position when a predetermined position on the screen S100 is touched with a finger or the like.
- the optical member 1 is a film-like rubber elastic body in which one surface 1a has an uneven shape and the other main surface S1 is flat.
- a phase difference plate 22 having a flat surface is adjacent to the surface 1a side having an uneven shape of the optical member 1.
- the optical member 1 is disposed in such a direction that a flat surface is positioned on the backlight 60 and the optical sensor 52 side.
- the surface 1a of the optical member 1 and the surface of the phase difference plate 22 which is another member adjacent to the optical member 1 are partially separated from each other, and are located between the optical member 1 and the phase difference plate 22 at a distant position.
- a void 2 is formed.
- the gas in the gap 2 may be air, or may be a stable and harmless gas such as nitrogen, helium and argon. Alternatively, the inside of the gap 2 may be a vacuum.
- FIG. 2 and 3 are schematic views for explaining the function of the optical member 1.
- the screen S ⁇ b> 100 of the touch panel 100 when the screen S ⁇ b> 100 of the touch panel 100 is not pressed, a part of the light emitted from the backlight 60 and entering the optical member 1 is reflected and reflected by the surface 1 a of the optical member 1. It becomes light L1. Since the surface 1a has a concavo-convex shape, light is easily reflected or scattered, and the amount of reflected light including scattered light received by the optical sensor 52 provided on the flat surface S1 side is relatively large.
- the phase difference plate 22 adjacent to the optical member 1 is locally bent toward the optical member 1 side, and the phase difference The plate 22 and the optical member 1 are pressed against each other. If it does so, the convex part in the uneven
- the amount of reflected light L2 reflected at the interface between the finger F and the screen S100 is generally smaller than the amount of reflected light L1.
- transmits an optical member becomes large. In this state, the amount of light received by the optical sensor 52 is often smaller than when the optical member 1 is not pressed.
- the optical member 1 when the optical member 1 is pressed from the surface (main surface) 1a side having an uneven shape, the amount of reflected light of the light incident from the surface S1 on the backlight 60 side changes. By detecting this optical change using an optical sensor provided on the surface S1 side, it is possible to recognize a predetermined position where the touch panel 100 is touched. Further, since the optical member 1 is provided between the polarizing plate 20 on the screen S100 side and the backlight 60, the backlight light and the reflected light thereof can be transmitted even during black display as in white display. It can be used efficiently.
- the optical sensor 52 is not particularly limited as long as it can detect an optical parameter of reflected light such as the amount of light.
- Specific examples include semiconductor elements that exhibit a photoelectric effect, such as amorphous silicon and polycrystalline silicon.
- the rubber elastic body as the optical member 1 has rubber elasticity capable of reversible deformation with respect to mechanical pressure. When the optical member 1 is pressed, the surface 1a having the irregular shape of the rubber elastic body 1 as the optical member 1 is easily and reversibly deformed.
- the compression elastic modulus of the rubber elastic body 1 is preferably 0.01 to 100 MPa.
- the compression modulus is less than 0.01 MPa, the surface is deformed even when no mechanical pressure is applied, and reflection and scattering of light incident from the light source tend not to occur.
- the compression modulus exceeds 100 MPa, the surface 1a is not easily deformed when pressed with a weak pressure, and therefore, it tends to be difficult to convert a change in mechanical pressure into an optical change.
- the compression modulus is preferably 0.01 to 100 MPa, 0.05 to 90 MPa, 0.1 to 80 MPa, 0.5 to 70 MPa, 1 to 60 MPa, or 1 to 10 MPa.
- the compression modulus is obtained from the slope of a load-displacement curve measured by a compression test under the following conditions using an ultra micro hardness tester.
- Sample thickness 100 ⁇ m (compressed in the thickness direction)
- Temperature 25 ° C
- Maximum pressure 0.1 mN / ⁇ m 2
- Indenter Circular flat indenter (diameter: 50 ⁇ m)
- the irregular shape of the surface 1a of the rubber elastic body 1 may be any shape that can reflect or scatter a part of the incident light.
- the maximum height of the concavo-convex shape (the maximum value of the height difference between the top of the convex portion and the bottom of the concave portion in a cross section having a predetermined length (for example, 10 mm)) is preferably 0.01 to 50 ⁇ m.
- the maximum height of the concavo-convex shape is preferably 0.1 to 45 ⁇ m, 0.5 to 40 ⁇ m, 0.7 to 35 ⁇ m, or 1 to 30 ⁇ m.
- the distance between the vertices of adjacent convex portions is preferably 0.01 to 150 ⁇ m, 0.1 to 100 ⁇ m, 0.5 to 90 ⁇ m, 0.7 to 70 ⁇ m, or 1 to 50 ⁇ m. .
- the rubber elastic body 1 is preferably made of a highly transparent material.
- the visible light transmittance of a double-sided flat film having a thickness of 20 ⁇ m formed of the material constituting the rubber elastic body 1 is 70 to 100%, 75 to 98%, 80 to 97%, 83 to 96%. Alternatively, it is preferably 85 to 95%.
- This visible light transmittance is measured by a method similar to a method for measuring changes in visible light transmittance before and after pressing, which will be described later, using a double-sided flat film formed using the material constituting the rubber elastic body 1. be able to.
- the absolute value of the difference in refractive index between the rubber elastic body 1 and other members adjacent thereto is preferably 0 to 0.1.
- the refractive index of the rubber elastic body 1 and the member adjacent thereto is 1.3 or more. It is preferable that These refractive indexes are measured by a known method such as a prism coupling method or a spectroscopic ellipsometry method.
- the material constituting the rubber elastic body as the optical member 1 is preferably various elastomers.
- suitable elastomers include natural rubber, synthetic polyisoprene, styrene and butadiene copolymer, butadiene and acrylonitrile copolymer, butadiene and alkyl acrylate copolymer, butyl rubber, bromobutyl rubber, chlorobutyl rubber, neoprene (chloroprene, 2-chloro -1,3-butadiene), olefin rubber (eg, ethylene propylene rubber (EPR), and ethylene propylene genomonomer (EPDM) rubber), nitrile elastomer, polyacrylic elastomer, polysulfide polymer, silicone elastomer, thermoplastic elastomer, heat Plastic copolyester, ethylene acrylic elastomer, vinyl acetate ethylene copolymer, epichlorohydrin, chlor
- silicone elastomer examples include peroxide vulcanization type silicone rubber, addition reaction type silicone rubber, photoreactive type silicone rubber and photo radical polymerization type silicone rubber.
- Peroxide vulcanized silicone rubber is prepared by blending an organic peroxide with a silicone raw rubber made of linear highly polymerized polyorganosiloxane and heating it to crosslink the silicone raw rubber to form a rubber elastic body. can get.
- the addition reaction type silicone rubber is obtained by a method of forming a rubber elastic body by performing cross-linking by addition reaction between polyorganosiloxane having an aliphatic unsaturated hydrocarbon group and polyorganohydrogensiloxane in the presence of a platinum catalyst. It is done.
- the photoreactive silicone rubber is obtained by a method in which an epoxy group-containing polyorganosiloxane is crosslinked by irradiating light in the presence of a photoacid generator to form a rubber elastic body.
- the photoradical polymerization reaction type silicone rubber is obtained by a method of forming a rubber elastic body by crosslinking an acryloyl group-containing polyorganosiloxane by light irradiation in the presence of a photopolymerization initiator.
- the polyorganosiloxane used to form the addition reaction type silicone rubber has two or more monovalent aliphatic unsaturated hydrocarbon groups bonded to silicon atoms in one molecule.
- the monovalent aliphatic unsaturated hydrocarbon group include a vinyl group, an allyl group, a 1-butenyl group, and a 1-hexenyl group. From the viewpoints of easy synthesis, fluidity of the composition before curing, and good heat resistance of the composition after curing, a vinyl group is most preferable.
- the monovalent aliphatic unsaturated hydrocarbon group may be present either at the terminal or in the middle of the polyorganosiloxane molecular chain, or may be present in both of them.
- the polyorganosiloxane preferably has a monovalent aliphatic unsaturated hydrocarbon group at both ends of the molecular chain.
- organic groups bonded to the silicon atom of the polyorganosiloxane include alkyl groups such as methyl, ethyl, propyl, butyl, pentyl, hexyl, octyl, decyl and dodecyl, aryl groups such as phenyl, benzyl, 2- Examples include aralkyl groups such as phenylethyl and 2-phenylpropyl, and substituted hydrocarbon groups such as chloromethyl, chlorophenyl, 2-cyanoethyl and 3,3,3-trifluoropropyl.
- a methyl group is most preferable from the viewpoint of easy synthesis and excellent balance of properties such as fluidity before crosslinking and compression elastic modulus of the formed rubber elastic body.
- the polyorganosiloxane may be linear or branched. Further, the degree of polymerization of the polyorganosiloxane is not particularly limited, but the composition before crosslinking has good fluidity and workability, and the composition after crosslinking has an appropriate compression modulus at 25 ° C.
- the viscosity is preferably 500 to 500,000 MPa ⁇ s, particularly preferably 1000 to 100,000 MPa ⁇ s.
- the polyorganohydrogensiloxane used for forming the addition reaction type silicone rubber is obtained by adding a hydrosilyl group contained in a molecule to a monovalent aliphatic unsaturated hydrocarbon group in the polyorganosiloxane. Functions as a crosslinking agent for siloxane.
- the polyorganohydrogensiloxane preferably has at least three hydrogen atoms bonded to silicon atoms. Examples of the organic group bonded to the silicon atom of the siloxane unit include the same organic groups other than the monovalent unsaturated aliphatic hydrocarbon group in the polyorganosiloxane, and among these, from the viewpoint of easy synthesis The methyl group is most preferred.
- the siloxane skeleton in the polyorganohydrogensiloxane may be linear, branched or cyclic, or a mixture thereof.
- the degree of polymerization of the polyorganohydrogensiloxane is not particularly limited, but it is difficult to synthesize a polyorganohydrogensiloxane in which two or more hydrogen atoms are bonded to the same silicon atom. It is preferable to have the above siloxane units.
- the compounding amount of the polyorganohydrogensiloxane is 0.5 to 0.5 hydrogen atoms bonded to silicon atoms in the polyorganohydrogensiloxane with respect to one monovalent aliphatic unsaturated hydrocarbon group in the polyorganosiloxane.
- the amount is preferably 5 pieces, preferably 1 to 3 pieces.
- the addition reaction type silicone rubber contains a platinum compound as a catalyst for accelerating the addition reaction between the monovalent aliphatic unsaturated hydrocarbon group in the polyorganosiloxane and the hydrosilyl group of the polyorganohydrogensiloxane. It is preferable to use it.
- platinum compounds include chloroplatinic acid, reaction products of chloroplatinic acid and alcohol, platinum-olefin complexes, platinum-vinylsiloxane complexes, and platinum-phosphine complexes.
- a reaction product of chloroplatinic acid and alcohol and a platinum-vinylsiloxane complex are preferred from the viewpoints of solubility in polyorganosiloxane and polyorganohydrogensiloxane and good catalytic activity.
- the compounding amount of the platinum-based compound is preferably 1 to 200 ppm by weight, more preferably 1 to 100 ppm by weight, more preferably 2 to 50 ppm by weight in terms of platinum atoms, relative to the polyorganosiloxane. Particularly preferred. If it is less than 1 ppm by weight, the curing rate is insufficient, and the production efficiency of the optical member tends to decrease. If it exceeds 200 ppm by weight, the crosslinking rate becomes excessively fast, so that each component is blended. Workability tends to be impaired.
- Other members adjacent to the optical member 1 (rubber elastic body) on the surface side having the concavo-convex shape substantially have rubber elasticity from the viewpoint that the concavo-convex shape of the optical member 1 can be effectively deformed by mechanical pressure. It is preferable to be composed of a hard material not shown.
- the other member adjacent to the optical member 1 is composed of an inorganic material selected from glass and ceramics, or an organic material selected from triacetyl cellulose, polyether sulfone, polyethylene terephthalate, and polyether naphthalate. It is preferable.
- the difference between the visible light transmittance when the optical member 1 is not pressed and the visible light transmittance when the optical member 1 is pressed is 0.1 to 50. % Is preferred. If this difference is less than 0.1%, it tends to be difficult to detect an optical change when a mechanical pressure is applied by an optical sensor, and if it exceeds 50%, no mechanical pressure is applied. It is necessary to increase the reflection or scattering in the optical member 1 at. If it does so, while it becomes difficult to design uneven
- the change in visible light transmittance before and after pressing can be measured by the following procedures 1) to 7).
- Visible light means light in a wavelength range of 380 to 780 nm that is generally visible.
- 1) A sample in which an optical member is placed on a glass substrate and a disk-shaped glass plate having a diameter of 10 mm and a thickness of 0.7 mm is placed thereon is prepared.
- the optical member is removed from the state, and the luminance b is measured in the same manner.
- T1 (a / b) ⁇ 100 (%).
- T1 (a / b) ⁇ 100 (%).
- T1 (a / b) ⁇ 100 (%).
- T1 (a / b) ⁇ 100 (%).
- 4) A sample similar to the above is prepared, and a load of 5 ⁇ 10 3 Pa is applied between the glass substrate and the disk-shaped glass plate. 5) While applying a load to the sample, irradiate the sample with a light beam in the visible region in the normal direction, and use a color luminance meter to determine the luminance c of the light beam transmitted through the sample in the range of the measurement viewing angle of 1 °. taking measurement. The optical member is removed from this state, and the luminance d is measured by the same method.
- the difference between the visible light reflectance when the optical member 1 is not pressed and the visible light reflectance when the optical member 1 is pressed is 0.1 to 50. % Is preferred. If this difference is less than 0.1%, it tends to be difficult to detect an optical change when a mechanical pressure is applied by an optical sensor, and if it exceeds 50%, no mechanical pressure is applied. It is necessary to increase the reflection or scattering in the optical member 1 at. If it does so, while it becomes difficult to design uneven
- the change in visible light reflectance before and after pressing can be measured by the following procedure. 1) A 0.7 mm-thick glass substrate and a disk-shaped glass plate having a diameter of 10 mm and a thickness of 0.7 mm are placed on a white plate such as magnesium oxide, and rays in the visible region are normal to the white plate. The brightness a ′ of the light beam reflected at an angle of 25 ° with respect to the normal direction of the white plate is measured using a spectrocolorimeter or the like. Next, an optical member is placed between the glass substrate and the disk-shaped glass plate, and the brightness b ′ of the reflected light is measured by the same method.
- the film thickness of the optical member 1 which is a rubber elastic body is preferably 1 to 500 ⁇ m. If the film thickness of the rubber elastic body 1 is less than 1 ⁇ m, it tends to be difficult to produce the rubber elastic body 1 having an uneven shape, and if it exceeds 500 ⁇ m, pressure transmission when pressure is applied to the optical member is weak. Therefore, there is a tendency that the surface shape of the rubber elastic body hardly changes. From the same viewpoint, the thickness of the rubber elastic body 1 is more preferably 5 to 400 ⁇ m, and further preferably 10 to 300 ⁇ m.
- the optical member 1 preferably has an absolute value of a difference in transmittance between visible light incident on one surface and visible light incident on the opposite surface of 1 to 20%.
- the absolute value of the transmittance difference is less than 1%, the touch panel tends to reflect outside light and tends to deteriorate the display quality.
- the absolute value exceeds 20% it is difficult to design the concave-convex shape to realize this.
- the absolute value of the transmittance difference is preferably 1.5 to 17%, 2 to 15%, 2.5 to 12%, or 3 to 10%.
- the visible light transmittance is determined by measuring the visible light transmittance from both surfaces of the optical member 1 by the same method as the above-mentioned measurement of “change in visible light transmittance before and after pressing”, and the absolute difference between them is measured. It can be obtained by calculating a value.
- An intermediate layer having a refractive index different from that of the rubber elastic body 1 may be provided on the surface of the rubber elastic body 1 having an uneven shape.
- the absolute value ( ⁇ n) of the difference between the refractive index of the rubber elastic body 1 having the uneven surface 1a and the refractive index of the intermediate layer is preferably 0.01 to 1.0.
- the absolute value of the refractive index difference is less than 0.01, the optical sensor cannot efficiently detect the reflected light from the optical member 1 when the optical member is not pressed. It tends to be difficult to recognize.
- the absolute value of the refractive index difference exceeds 1.0, it tends to be difficult to select a material having a refractive index necessary to achieve this.
- the absolute value of the refractive index difference is preferably 0.03 to 0.7, 0.05 to 0.5, 0.07 to 0.3, or 0.1 to 0.2.
- the refractive index is measured by a known method such as a prism coupling method or a spectroscopic ellipsometry method.
- the intermediate layer is preferably sticky.
- the resin used for forming the adhesive intermediate layer is not particularly limited as long as it exhibits adhesiveness to the rubber elastic body 1.
- an acrylic resin, a cross-linked acrylic resin, an acrylic single resin is used.
- examples include a monomer, a silicone resin, a fluororesin, and a polyvinyl alcohol resin. These can be used alone or in combination of two or more.
- the acrylic resin a copolymer containing an unsaturated monomer exhibiting a low glass transition temperature is preferable.
- the unsaturated monomer exhibiting a low glass transition temperature include butyl acrylate, butyl methacrylate, ethyl acrylate, ethyl methacrylate, 2-ethylhexyl acrylate, and 2-ethylhexyl methacrylate.
- unsaturated monomers used in the copolymer containing unsaturated monomers exhibiting a low glass transition temperature include, for example, methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, acrylic N-propyl acid, n-propyl methacrylate, iso-propyl acrylate, iso-propyl methacrylate, n-butyl acrylate, n-butyl methacrylate, iso-butyl acrylate, iso-butyl methacrylate, acrylic acid sec-butyl, sec-butyl methacrylate, tert-butyl acrylate, tert-butyl methacrylate, pentyl acrylate, pentyl methacrylate, hexyl acrylate, hexyl methacrylate, heptyl acrylate, heptyl methacrylate, 2-acrylic acid 2- Ethylhexy
- the cross-linked acrylic resin is a copolymer containing an unsaturated monomer having a functional group as a copolymer component, such as acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, acrylamide, and acrylonitrile. Is crosslinked with a crosslinking agent.
- cross-linking agent known cross-linking agents such as isocyanate, melamine, and epoxy can be used. Further, as the crosslinking agent, a polyfunctional crosslinking agent such as trifunctional or tetrafunctional is more preferably used in order to form a network structure that gradually spreads in the crosslinked acrylic resin.
- the weight average molecular weight (value measured by gel permeation chromatography and converted to standard polystyrene) of the acrylic resin and the copolymer used to obtain the cross-linked acrylic resin is the viewpoint of the adhesiveness to the rubber elastic body 1 Therefore, it is preferably 1000 to 300000, more preferably 5000 to 150,000.
- a monomer having adhesiveness can be used.
- the monomer include polyethylene glycol diacetate, polypropylene glycol diacetate, urethane monomer, nonylphenyl dixylene acrylate, nonylphenyl dixylene methacrylate, ⁇ -chloro- ⁇ -hydroxypropyl- ⁇ '-acryloyloxyethyl-o -Phthalate, ⁇ -chloro- ⁇ -hydroxypropyl- ⁇ '-methacryloyloxyethyl-o-phthalate, ⁇ -hydroxyethyl- ⁇ '-acryloyloxyethyl-o-phthalate, ⁇ -hydroxyethyl- ⁇ '-methacryloyloxyethyl -O-phthalate, ⁇ -hydroxypropyl- ⁇ '-acryloyloxyethyl-o-phthalate, ⁇ -hydroxypropyl- ⁇ '-me
- the glass transition temperature (Tg) of the intermediate layer is preferably ⁇ 20 ° C. or lower.
- Tg glass transition temperature
- the thickness of the intermediate layer (the thickness of the portion excluding the portion filled in the concave and convex portions) is preferably 1 to 50 ⁇ m.
- the thickness of the intermediate layer is less than 1 ⁇ m, there is a tendency to entrap bubbles when laminating the rubber elastic body 1, and when it exceeds 50 ⁇ m, pressure is not easily transmitted when the touch panel is touched. There is a tendency that the surface shape of the rubber elastic body 1 is not easily deformed.
- the thickness of the intermediate layer is more preferably 2 to 40 ⁇ m, and further preferably 3 to 30 ⁇ m.
- the optical member 1 may be used in the state of a laminate comprising the support film and the optical member 1 provided on the support film.
- the support film include films having a thickness of about 5 to 100 ⁇ m made of polyethylene terephthalate, polycarbonate, polyethylene, polypropylene, polyethersulfone, and triacetyl cellulose.
- a resin layer having adhesiveness or adhesiveness may be provided between the support film and the optical member 1.
- a cover film may be further laminated on the rubber elastic body (optical member 1).
- the cover film include films made of polyethylene, polypropylene, polyethylene terephthalate, polycarbonate, triacetyl cellulose, and the like and having a thickness of about 5 to 100 ⁇ m.
- a resin layer having adhesiveness or adhesiveness may be provided between the cover film and the rubber elastic body.
- FIG. 4 is an end view showing an embodiment of a method for manufacturing the optical member 1.
- the manufacturing method shown in FIG. 4 includes a step of forming a film-like rubber elastic body 1 having a concavo-convex surface 1a transferred from the concavo-convex surface on the concavo-convex surface of the mold 7, and the rubber elastic body 1 as a mold. And a step of peeling from 7.
- a liquid material containing components constituting the rubber elastic body 1 is applied onto the uneven surface of the mold 7 using a roll 8.
- the applied liquid material is changed into a solid state by heat or light (FIG. 4B).
- the rubber elastic body 1 is peeled off from the mold 7 (FIG. 4C).
- the liquid material 1 for forming a rubber elastic body is applied to a flat substrate, a mold having an uneven surface is pressed there, and the liquid material is changed to a solid state in that state. You can also
- a rubber elastic body 1 having both concavo-convex shapes is obtained by laminating another mold having a concavo-convex surface on the liquid 7 applied on the mold 7 and changing the liquid into a solid state in that state. You can also.
- the mold 7 is a film having a large number of fine irregularities formed on the surface.
- the mold 7 is obtained, for example, by a method in which an original having an uneven surface is pressed against a photosensitive resin composition layer formed on a flat support film, and the photosensitive resin composition layer is photocured in that state. be able to. Moreover, it can also obtain by the method of pressing the flat surface of a film directly on the original
- the above-mentioned prototype is, for example, a photoresist applied on a glass plate is exposed and developed using a photomask having a predetermined mask pattern, or laser-cutting to form a resist pattern, and a vacuum evaporation method is formed there It can be obtained by forming a metal film such as silver or nickel (conducting treatment) by sputtering or the like, laminating a metal such as copper and nickel by electroforming, and then peeling the metal film from the glass plate. .
- the uneven shape can be controlled to a random shape, a line shape, a rectangular shape, a prismatic shape, a cylindrical shape, a dot lens shape, a cylindrical lens shape, etc. according to the mask pattern shape or the resist pattern shape.
- the shape is transferred to the surface of the rubber elastic body 1.
- the prototype By performing metal plating such as copper or nickel on the conductive metal surface, it is possible to produce a prototype in which a number of fine irregularities are formed on the surface. In this case, a random uneven shape is formed.
- the prototype can also be produced by a method in which a diamond indenter is pressed against a smooth prototype substrate such as stainless steel. At this time, the diamond indenter is pressed while moving the original substrate in the horizontal direction, or the indenter is pressed while moving the indenter while the original substrate is stationary, so that it is flat, spherical or curved. A large number of concave and convex shapes having a part of can be formed.
- the shape of the diamond indenter it is possible to control to a random shape, a line shape, a rectangular shape, a prismatic shape, a cylindrical shape, a dot lens shape, a cylindrical lens shape, and the like.
- the prototype may be a flat plate or a roll having a curved surface.
- the uneven shape may be arranged randomly, or may be arranged according to a predetermined rule.
- a known application method can be used. For example, doctor blade coating method, Mayer bar coating method, roll coating method, screen coating method, spinner coating method, ink jet coating method, spray coating method, dip coating method, gravure coating method, curtain coating method, die coating method, etc. .
- liquid material for forming the rubber elastic body contains a solvent, it can be applied and then dried to remove the solvent.
- the optical member thus obtained can be stored in a roll or stored.
- An optical member having an intermediate layer is formed by forming a rubber elastic body on a support film, applying a solution containing components constituting the intermediate layer thereon by the known method, and drying if necessary. It can be obtained by laminating a rubber elastic body on the intermediate layer.
- the touch panel 100 includes, for example, a step of laminating the optical member 1 on one side of the liquid crystal cell 4, a step of laminating the retardation plate 22 and the polarizing plate 20 on the optical member 1, and the other side of the liquid crystal cell 4. And providing the polarizing plate 21 and the backlight 60 in this order.
- the optical film 1 is laminated on the liquid crystal cell 4 via the adhesive layer 31 after removing the cover film.
- the crimping roll may be provided with a heating means so that it can be thermocompression bonded.
- the heating temperature for thermocompression bonding is preferably 10 to 100 ° C, more preferably 20 to 80 ° C, and even more preferably 30 to 60 ° C.
- the heating temperature is less than 10 ° C., the adhesion between the optical member 1 and the liquid crystal cell 4 tends to decrease, and when the heating temperature exceeds 100 ° C., the liquid crystal cell 4 tends to deteriorate.
- the pressure during the thermocompression bonding is preferably 50 to 1 ⁇ 10 5 N / m, more preferably 2.5 ⁇ 10 2 to 5 ⁇ 10 4 N / m in terms of linear pressure, and 5 ⁇ 10 2 to 4 ⁇ . 10 4 N / m is more preferable. If this pressure is less than 50 N / m, the adhesion between the optical member 1 and the liquid crystal cell 4 tends to decrease. If it exceeds 1 ⁇ 10 5 N / m, the liquid crystal cell 4 may be destroyed. Get higher. Can be laminated on top.
- the retardation film 22 and the polarizing plate 20 can also be laminated on the optical member 1 by the same method as described above. Moreover, the polarizing plate 21 can be laminated
- the method of mounting the backlight 60 on the liquid crystal cell 4 is not particularly limited, and a known method can be used. Examples include a method in which the liquid crystal cell 4 is incorporated into a housing for constituting a module, or thermocompression bonding is performed with a sealing material.
- the backlight 60 includes, for example, a light emitting diode, a light guide plate, a reflection plate, and a diffusion plate.
- both sides of the rubber elastic body may have an uneven shape.
- the display device combined with the optical member according to the present invention is not limited to the liquid crystal display device as long as it includes a light source and an optical sensor. Examples of other display devices include a plasma display, an organic electroluminescence display, and electronic paper.
- Example 1 Production of optical member (i) A polyethylene terephthalate film was sandblasted to form an uneven surface, which was used as a mold for forming a rubber elastic body as an optical member. On the concavo-convex surface of the polyethylene terephthalate film, an addition reaction type silicone resin solution (Momentive Performance Materials Japan GK, trade name TSE-3032) was uniformly applied using a comma coater. Thereafter, a solid silicone rubber layer as an optical member (i) having a flat surface on one side and an uneven surface on the other side was formed by heating for 30 minutes using a hot air convection dryer at 100 ° C. .
- an addition reaction type silicone resin solution Momentive Performance Materials Japan GK, trade name TSE-3032
- the obtained silicone rubber layer is peeled from the polyethylene terephthalate film, and the maximum height of the concavo-convex shape and the film thickness (thickness of the portion excluding the concavo-convex shape) are measured by a surface shape measuring device manufactured by Kosaka Laboratory. (Surfcoder SE-30D type) was used for measurement. As a result, the maximum height was 3 ⁇ m and the film thickness was 100 ⁇ m.
- Compression elastic modulus The addition reaction type silicone resin solution used to form the optical member (i) was uniformly applied on the smooth surface of the polyethylene terephthalate film using a comma coater, and then heated with a 100 ° C hot air convection dryer. Heated for 30 minutes to form a solid silicone rubber layer.
- the obtained silicone rubber layer was peeled from the polyethylene terephthalate film to obtain a silicone rubber layer alone having flat surfaces.
- the thickness of the obtained silicone rubber layer alone was 100 ⁇ m.
- the obtained silicone rubber layer alone was laminated on a glass substrate having a thickness of 0.7 mm to obtain a sample for evaluation of compression modulus.
- Optical member (i) is laminated on a glass substrate having a thickness of 0.7 mm using a laminator (manufactured by Hitachi Chemical Co., Ltd., trade name HLM-3000 type). did. At this time, it laminated
- the lamination conditions at this time were a roll temperature of 25 ° C., a substrate feed rate of 1 m / min, and a pressure bonding pressure (cylinder pressure) of 4 ⁇ 10 5 Pa. In the following Examples and Comparative Examples, the lamination of the optical member on the glass substrate was performed under the same conditions in principle.
- a disk-shaped glass plate having a diameter of 10 mm and a thickness of 0.7 mm was placed on the surface of the optical member (i) having an uneven shape.
- the sample is irradiated with a visible light beam using a LED backlight used in a liquid crystal display device as a light source in the normal direction, and measured using a color luminance meter (BM-5A) manufactured by Topcon Corporation.
- the luminance a of the light beam that passed through the sample was measured within a viewing angle range of 1 °.
- a disk-shaped glass plate was placed on the optical member (i) on the glass substrate in the same manner as described above, and a compressive load of 5 ⁇ 10 3 Pa was applied between the glass substrate and the disk-shaped glass plate.
- the luminance c of the light beam transmitted through the sample in the range of the measurement viewing angle 1 ° was measured.
- the absolute value ( ⁇ T) of the difference between the obtained visible light transmittances T1 and T2 was 15%. From this result, it was confirmed that the visible light transmittance of the obtained optical member (i) was sufficiently changed by applying a mechanical pressure.
- the optical member (i) was laminated on a glass substrate having a thickness of 0.7 mm.
- the optical member (i) was laminated such that the flat surface of the optical member (i) was in contact with the glass substrate.
- a disk-shaped glass plate having a diameter of 10 mm and a thickness of 0.7 mm was placed thereon.
- the sample is irradiated with visible light in the normal direction by the same method as described above, and the brightness b ′ of the reflected light reflected in the direction at an angle of 25 ° with respect to the normal direction of the sample is measured. did.
- the sample was irradiated with visible light in the normal direction in the same manner as described above, and the normal of the sample
- the brightness c ′ of the reflected light reflected in a direction at an angle of 25 ° with respect to the direction was measured.
- the absolute value ( ⁇ R) of the difference between the obtained visible light reflectances R1 and R2 was 30%. From this result, it was confirmed that the visible light reflectance of the obtained optical member (i) was sufficiently changed by applying a mechanical pressure.
- Visible light transmittance of a double-sided flat film formed of the material constituting the optical member (i) The addition reaction type silicone resin solution used to form the optical member (i) is applied on the flat surface of the polyethylene terephthalate film. And then heated for 30 minutes with a hot air convection dryer at 100 ° C. to form a solid silicone rubber layer.
- the obtained silicone rubber layer was peeled from the polyethylene terephthalate film to obtain a single silicone rubber layer (thickness 20 ⁇ m) for visible light transmittance evaluation having flat surfaces.
- This silicone rubber layer alone was laminated on a 0.7 mm thick glass substrate to produce a sample for evaluating visible light transmittance.
- the sample is irradiated in the normal direction with respect to the sample using a LED backlight as a light source, and the sample is measured with a Topcon Co., Ltd. color luminance meter (BM-5A) within a measurement viewing angle range of 1 °.
- the luminance A of the light beam that passed through was measured. From this state, only the silicone rubber layer alone was removed, and the luminance B was measured in the same manner.
- optical member (i) Difference in transmittance of optical member (i) depending on incident direction of visible light
- the optical member (i) was laminated on a glass substrate having a thickness of 0.7 mm. At this time, the optical member (i) was laminated such that the flat surface of the optical member (i) was in contact with the glass substrate.
- the difference ( ⁇ T ′) between the obtained visible light transmittances T′1 and T′2 was 6%. From this result, when the optical member (i) is disposed on the surface of the display device, it was confirmed that the reflection of external light can be suppressed and the display device has a characteristic that provides good display quality.
- Example 2 Production of optical member (ii) A polyethylene terephthalate film was sandblasted to form an uneven surface, which was used as a mold for forming an optical member. On the uneven surface of the polyethylene terephthalate film, an addition reaction type silicone resin solution (product name TSE-3450, manufactured by Momentive Performance Materials Japan GK) was uniformly applied using a comma coater. Thereafter, by heating for 30 minutes using a hot air convection dryer at 100 ° C., a solid silicone rubber layer having a flat surface on one side and an uneven surface on the other side was formed as the optical member (ii). When the maximum height and film thickness of the surface of the obtained optical member (ii) having an uneven shape were measured in the same manner as in Example 1, the maximum height was 6 ⁇ m and the film thickness was 100 ⁇ m.
- Compression elastic modulus The addition reaction type silicone resin solution used for forming the optical member (ii) was uniformly applied on the smooth surface of the polyethylene terephthalate film using a comma coater, and then heated with a 100 ° C hot air convection dryer. Heated for 30 minutes to form a solid silicone rubber layer. The compression elastic modulus of the formed silicone rubber layer was measured in the same manner as in the case of the optical member (i), and was 5 MPa. From this result, it was confirmed that the optical member (ii) has rubber elasticity that allows reversible deformation and restoration of the surface.
- Visible light transmittance of a double-sided flat film formed from the material constituting the optical member (ii) The addition-reactive silicone resin solution used to form the optical member (ii) is separated on the smooth surface of the polyethylene terephthalate film. It was uniformly coated using a coater and heated for 30 minutes with a 100 ° C. hot air convection dryer to form a solid silicone rubber layer.
- the obtained silicone rubber layer was peeled from the polyethylene terephthalate film to obtain a single silicone rubber layer (thickness 20 ⁇ m) for visible light transmittance evaluation having flat surfaces.
- This silicone rubber layer alone was laminated on a 0.7 mm thick glass substrate to produce a sample for evaluating visible light transmittance. Visible light rays in the visible region using an LED backlight used in a liquid crystal display device as a light source are irradiated in the normal direction to the sample, and using a Topcon Co., Ltd. color luminance meter (BM-5A), measurement viewing angle The luminance A of the light beam transmitted through the sample in the range of 1 ° was measured. From this state, only the silicone rubber layer alone was removed, and the luminance B was measured in the same manner.
- BM-5A color luminance meter
- Example 3 Production of Optical Member (iii) A photosensitive resin having the following composition was dissolved in propylene glycol monoethyl ether acetate to prepare a photosensitive resin solution.
- This photosensitive resin solution was uniformly applied on a 50 ⁇ m thick polyethylene terephthalate film using a comma coater. Thereafter, it was dried for 5 minutes with a hot air convection dryer at 100 ° C. to form a photosensitive layer made of a photosensitive resin.
- the photosensitive resin was irradiated with ultraviolet rays at an exposure amount of 5 ⁇ 10 3 J / m 2 (measured value at i-line (wavelength 365 nm)). Photocured. Thereafter, the roll master was separated, and irregular irregular shapes were formed on the surface of the photosensitive layer.
- the photosensitive layer having the uneven surface was used as a mold for forming the optical member (iii).
- the addition reaction type silicone resin solution (Momentive Performance Materials Japan G.K., trade name TSE-3032) was uniformly coated on the uneven surface of the photosensitive layer using a comma coater. Then, it heated for 30 minutes with a 100 degreeC hot-air convection dryer, and formed the solid silicone rubber layer which one side is flat and the opposite surface has uneven
- the maximum height and film thickness (thickness of the portion excluding the uneven surface) of the uneven surface of the obtained optical member (iii) were measured in the same manner as in Example 1, the maximum height was 5 ⁇ m, and the film thickness was It was 100 ⁇ m.
- the compression elastic modulus of the optical member (iii) The addition reaction type silicone resin solution used for forming the optical member (iii) was uniformly applied on the smooth surface of the polyethylene terephthalate film using a comma coater, The solid silicone rubber layer was formed by heating for 30 minutes in a hot air convection dryer. When the compression elastic modulus of the formed silicone rubber layer was measured in the same manner as in the case of the optical member (i), it was 3 MPa. From this result, it was confirmed that the optical member (iii) has rubber elasticity that allows reversible deformation and restoration of the surface shape.
- Visible light transmittance of the double-sided flat film formed from the material constituting the optical member (iii) Add the addition reaction type silicone resin solution used to form the optical part (iii) on the smooth surface of the polyethylene terephthalate film It applied uniformly using the comma coater, and it heated for 30 minutes with a 100 degreeC hot-air convection-type dryer, and formed the solid silicone rubber layer.
- the obtained silicone rubber layer was peeled from the polyethylene terephthalate film to obtain a single silicone rubber layer (thickness 20 ⁇ m) for visible light transmittance evaluation having flat surfaces.
- the silicone rubber layer alone was laminated on a glass substrate having a thickness of 0.7 mm using the same apparatus and conditions as described above to prepare a sample for evaluating visible light transmittance. Visible light rays in the visible region using an LED backlight used in a liquid crystal display device as a light source are irradiated in the normal direction to the sample, and using a Topcon Co., Ltd. color luminance meter (BM-5A), measurement viewing angle The luminance A of the light beam transmitted through the sample in the range of 1 ° was measured.
- BM-5A color luminance meter
- Example 4 Production of Optical Member (iv) A resin solution was prepared by dissolving a tacky resin having the following composition in propylene glycol monoethyl ether acetate. This resin solution was uniformly applied on a flat surface of a triacetyl cellulose film with a comma coater and dried for 5 minutes with a hot air convection dryer at 100 ° C. to form an intermediate layer which is an adhesive resin layer.
- a silicone rubber layer similar to the optical member (i) obtained in the same manner as in Example 1 was obtained.
- the intermediate layer was laminated on the surface of the silicone rubber layer having an uneven shape to obtain an optical member (iv) composed of the silicone rubber layer and the intermediate layer.
- the addition reaction type silicone resin solution used to form the silicone rubber layer was diluted with methyl ethyl ketone and uniformly applied onto a silicon wafer using a spin coater. Subsequently, it heated for 30 minutes with a 100 degreeC hot-air convection-type dryer, and formed the silicone rubber layer (2 micrometers in thickness).
- the above-mentioned adhesive resin used for forming the intermediate layer was dissolved in methyl ethyl ketone and uniformly coated on a silicon wafer using a spin coater. Subsequently, it heated for 30 minutes with a 100 degreeC hot-air convection-type dryer, and formed the resin layer (2 micrometers in thickness) which has adhesiveness.
- the difference ( ⁇ n) between the refractive index n1 of the silicone rubber constituting the silicone rubber layer and the refractive index n2 of the adhesive resin constituting the intermediate layer was 0.15. From this result, the optical member (vi) has a function of reflecting or scattering the incident visible light in a state where no mechanical pressure is applied, and the visible light transmittance is sufficient by applying the mechanical pressure. It was confirmed that
- Comparative Example 1 Preparation of optical member for comparison On a polyethylene terephthalate film having a flat film thickness of 100 ⁇ m on both sides, a photosensitive resin solution prepared by dissolving a photosensitive resin having the following composition in propylene glycol monoethyl ether acetate was uniformly applied with a comma coater. A photosensitive layer was formed by drying for 5 minutes in a hot air convection dryer at 100 ° C.
- composition of photosensitive resin 55% by weight of methacrylic acid / benzyl methacrylate / methyl methacrylate copolymer resin Dipentaerythritol hexaacrylate 40% by weight Benzophenone 4.7% by weight N, N′-tetraethyl-4,4′-diaminobenzophenone 0.3% by weight
- the photosensitive layer was irradiated with ultraviolet rays at an exposure amount of 5 ⁇ 10 3 J / m 2 (measured value at i-line (wavelength 365 nm)), An acrylic resin film having flat surfaces was formed as a comparative optical member. It was 50 micrometers when the thickness of this optical member was measured using the surface shape measuring apparatus (Surfcoder SE-30D type
- the photosensitive resin solution used to form the optical member for comparison was uniformly applied on a flat surface of a polyethylene terephthalate film having a thickness of 50 ⁇ m using a comma coater, and hot air convection drying at 100 ° C.
- a photosensitive layer was formed by drying for 5 minutes on a machine. Thereafter, using a parallel light exposure machine (EXM1201 manufactured by Oak Seisakusho Co., Ltd.), with an exposure amount of 5 ⁇ 10 3 J / m 2 (measured value at i-line (wavelength 365 nm)), the polyethylene terephthalate film side and photosensitive Each was irradiated with ultraviolet rays from the side of the functional resin composition layer.
- a photosensitive layer for evaluation of compression modulus having a film thickness of 100 ⁇ m formed from the same material as that of the comparative optical member was formed.
- the compression elastic modulus was measured in the same manner as in Example 1. As a result, it was 70 GPa. Further, this photosensitive layer was plastically deformed when greatly distorted, and had substantially no rubber elasticity.
- Table 1 summarizes the structure and evaluation results of the optical member produced above.
- a retardation plate and a polarizing plate were sequentially laminated on the optical member (i) laminated on the evaluation liquid crystal cell by the same lamination method as described above. Moreover, the polarizing plate was laminated
- This liquid crystal module was connected to a drive circuit and driven by a program that developed a touch panel function.
- the liquid crystal screen is touched from the optical member (i) side using a non-conductive pen in a dark place, the position touched by the pen is recognized by the optical sensor, and the image as programmed is not malfunctioned. was gotten. From this result, it was confirmed that the touch panel function operates without problems by mounting the optical member (i). Moreover, reflection of external light was suppressed and display quality was good.
- Comparative Example 2 A liquid crystal module for touch panel function evaluation was produced in the same manner as in Example 7 except that the comparative optical member obtained in Comparative Example 1 was used in place of the optical member (i).
- the obtained liquid crystal module was connected to a drive circuit, driven by a program for developing a touch panel function, and a liquid crystal screen was touched using a non-conductive pen in a dark place.
- the position touched with the pen was not recognized, and no change was observed in the image. That is, the liquid crystal module cannot be operated normally as a touch panel.
Abstract
Description
試料膜厚:100μm(厚さ方向に圧縮)
温度:25℃
最大加圧:0.1mN/μm2
測定時間:20秒
圧子:円形平面圧子(直径φ50μm)
1)光学部材をガラス基板上に載置し、その上に直径φ10mm、厚さ0.7mmの円盤状ガラス板を載置した試料を準備する。
2)試料に対して可視領域の光線を試料に対して法線方向に照射し、色彩輝度計を使用して、測定視野角1°の範囲で試料を透過した光線の輝度aを測定し、その状態から光学部材を取り除いて同様に輝度bを測定する。
3)押圧されていないときの可視光線透過率T1を式:T1=(a/b)×100(%)により算出する。
4)上記と同様の試料を準備し、ガラス基板と円盤状ガラス板間に5×103Paの荷重を加える。
5)試料に荷重を加えながら、可視領域の光線を試料に対して法線方向に照射し、色彩輝度計を使用して、測定視野角1°の範囲で試料を透過した光線の輝度cを測定する。この状態から光学部材を取り除き、同様の方法で輝度dを測定する。
6)押圧されたときの可視光線透過率T2を式:T2=(c/d)×100(%)により算出する。
7)可視光線透過率T1とT2の差の絶対値(ΔT)を、押圧前後での可視光線透過率の変化として求める。
1)酸化マグネシウムなどの白色板上に厚さ0.7mmのガラス基板及び直径φ10mm、厚さ0.7mmの円盤状ガラス板を載置し、可視領域の光線を白色板に対して法線方向に照射して、分光測色計などを使用して、白色板の法線方向に対して角度25°に反射した光線の明度a’を測定する。次いで、ガラス基板と円盤状ガラス板との間に光学部材を載置して同様の方法で反射光線の明度b’を測定する。
2)光学部材が押圧されていないときの可視光線反射率R1を式:R1=(b’/a’)×100(%)により算出する。
3)ガラス基板と円盤状ガラス板との間に5×103Paの荷重を加えながら1)と同様の方法で反射光線の明度をc’を測定する。
4)光学部材が押圧されたときの可視光線反射率R2を式:R2=(c’/a’)×100(%)により算出する。
5)押圧前後での可視光線反射率R1とR2の差の絶対値(ΔR)を、押圧前後での可視光線反射率の変化として求める。
光学部材(i)の作製
ポリエチレンテレフタレートフィルムに対してサンドブラスト処理を施して凹凸表面を形成させ、これを光学部材としてのゴム弾性体形成用の型として用いた。このポリエチレンテレフタレートフィルムの凹凸表面上に、付加反応型シリコーン樹脂溶液(モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社製、商品名TSE-3032)を、コンマコーターを用いて均一に塗布した。その後、100℃の熱風対流式乾燥機を用いた30分間の加熱により、片面が平坦でその反対側の表面が凹凸形状を有する光学部材(i)としての固体状のシリコーンゴム層を形成させた。
光学部材(i)を形成するために使用した付加反応型シリコーン樹脂溶液を、ポリエチレンテレフタレートフィルムの平滑面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で30分間加熱して、固体状のシリコーンゴム層を形成させた。
光学部材(i)を、厚さ0.7mmのガラス基板上に、ラミネータ(日立化成工業(株)製、商品名HLM-3000型)を用いて積層した。このとき、光学部材(i)の平坦面がガラス基板に接するように積層し、可視光線透過率変化評価用試料を作製した。また、このときの積層条件は、ロール温度25℃、基板送り速度1m/分、圧着圧力(シリンダ圧力)4×105Paであった。以下の実施例及び比較例では、光学部材のガラス基板上への積層等の積層は原則として同様の条件で行った。
酸化マグネシウム製の白色板に厚さ0.7mmのガラス基板及び直径φ10mm、厚さ0.7mmの円盤状ガラス板を載置した。そして、コニカミノルタホールディングス(株)製cm512m3型分光測色計を使用して、白色板に対して法線方向に可視光線を照射し、白色板の法線方向に対して角度25°の方向に反射した反射光の明度a’を測定した。
光学部材(i)を形成するために使用した付加反応型シリコーン樹脂溶液を、ポリエチレンテレフタレートフィルムの平坦面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で30分間加熱して、固体状のシリコーンゴム層を形成させた。
光学部材(i)を厚さ0.7mmのガラス基板上に積層した。このとき、光学部材(i)の平坦な表面がガラス基板に接する向きで光学部材(i)を積層した。
光学部材(ii)の作製
ポリエチレンテレフタレートフィルムに対してサンドブラスト処理を施して凹凸表面を形成させ、これを光学部材形成用の型として用いた。このポリエチレンテレフタレートフィルムの凹凸表面上に、付加反応型シリコーン樹脂溶液(モメンティブ・パフォーマンス・マテリアルズ・ジャパン合同会社製、商品名TSE-3450)を、コンマコーターを用いて均一に塗布した。その後、100℃の熱風対流式乾燥機を用いた30分間の加熱により、片面が平坦でその反対側の表面が凹凸形状を有する固体状のシリコーンゴム層を光学部材(ii)として形成させた。得られた光学部材(ii)の凹凸形状を有する表面の最大高さ及び膜厚を実施例1と同様に測定したところ、最大高さは6μmであり、膜厚は100μmであった。
光学部材(ii)を形成するために使用した付加反応型シリコーン樹脂溶液を、ポリエチレンテレフタレートフィルムの平滑面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で30分間加熱して、固体状のシリコーンゴム層を形成させた。形成されたシリコーンゴム層の圧縮弾性率を光学部材(i)の場合と同様にして測定したところ、5MPaであった。この結果から、光学部材(ii)は、表面の可逆的な変形及び復元が可能なゴム弾性を有することが確認できた。
実施例1と同様にして、光学部材(ii)のT1及びT2を測定し、その差(ΔT)を求めたところ、20%であった。この結果から、光学部材(ii)は、力学的圧力を加えることによって可視光線透過率が十分に変化することを確認できた。
実施例1と同様にして、光学部材(ii)のR1及びR2を測定し、それらの差(ΔR)を求めたところ、35%であった。この結果から、光学部材(ii)は、力学的圧力を加えることによって可視光線反射率が十分に変化することを確認できた。
光学部材(ii)を形成するために使用した付加反応型シリコーン樹脂溶液を、ポリエチレンテレフタレートフィルムの平滑面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で30分間加熱して、固体状のシリコーンゴム層を形成させた。
光学部材(iii)の作製
下記組成を有する感光性樹脂をプロピレングリコールモノエチルエーテルアセテートに溶解して、感光性樹脂溶液を準備した。
感光性樹脂の組成:
アクリル酸/ブチルアクリレート/ビニルアセテート=15/30/55(重量部)の共重合樹脂(重量平均分子量6万(ゲルパーミエーションクロマトグラフィー法による測定の標準ポリスチレン換算値)) 33重量%
ブチルアクリレート 53重量%
ビニルアセテート 8重量%
アクリル酸 2重量%
ヘキサンジオールアクレレート 1重量%
ベンゾインイソブチルエーテル 3重量%
光学部材(iii)を形成するために使用した付加反応型シリコーン樹脂溶液を、ポリエチレンテレフタレートフィルムの平滑面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で30分間加熱して、固体状のシリコーンゴム層を形成させた。形成されたシリコーンゴム層の圧縮弾性率を光学部材(i)の場合と同様にして測定したところ、3MPaであった。この結果から、光学部材(iii)は、表面形状の可逆的な変形及び復元が可能なゴム弾性を有することが確認できた。
実施例1と同様にして、光学部材(iii)のT1及びT2を測定し、その差(ΔT)を求めたところ、18%であった。この結果から、光学部材(iii)は、力学的圧力を加えることによって可視光線透過率が十分に変化することを確認できた。
実施例1と同様にして、光学部材(iii)のR1及びR2を測定し、それらの差(ΔR)を求めたところ、38%であった。この結果から、光学部材(iii)は、力学的圧力を加えることによって可視光線反射率が十分に変化することを確認できた。
光学部時(iii)を形成するために使用した付加反応型シリコーン樹脂溶液を、ポリエチレンテレフタレートフィルムの平滑面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で30分間加熱して、固体状のシリコーンゴム層を形成させた。
光学部材(iv)の作製
下記組成を有する粘着性を有する樹脂をプロピレングリコールモノエチルエーテルアセテートに溶解した樹脂溶液を準備した。この樹脂溶液をトリアセチルセルロースフィルムの平坦面上にコンマコーターで均一に塗布し、100℃の熱風対流式乾燥機で5分間乾燥して、粘着性を有する樹脂層である中間層を形成した。
粘着性を有する樹脂の組成:
メタクリル酸/メタクリル酸ベンジル=15/85(重量部)の共重合樹脂(重量平均分子量3万(ゲルパーミエーションクロマトグラフィー法による測定の標準ポリスチレン換算値)) 30重量%
o-フェニルフェノールグリシジルエーテルアクリレート 70重量%
実施例1と同様にして、光学部材(iv)のT1及びT2を測定し、その差(ΔT)を求めたところ、12%であった。この結果から、光学部材(iv)は、力学的圧力を加えることによって可視光線透過率が十分に変化することを確認できた。
実施例1と同様にして、光学部材(iv)のR1及びR2を測定し、それらの差(ΔR)を求めたところ、27%であった。この結果から、光学部材(iv)は、力学的圧力を加えることによって可視光線反射率が十分に変化することを確認できた。
上記シリコーンゴム層を形成するために使用した付加反応型シリコーン樹脂溶液をメチルエチルケトンで希釈し、シリコンウェハ上にスピンコーターを使用して均一に塗布した。次いで100℃の熱風対流式乾燥機で30分間加熱して、シリコーンゴム層(厚さ2μm)を形成した。このシリコーンゴム層の屈折率を、Metricon社製屈折率計(2010型プリズムカプラ、光源レーザー波長633nm)を使用して測定したところ、屈折率n1=1.41であった。
比較用光学部材の作製
両面が平坦な膜厚100μmのポリエチレンテレフタレートフィルム上に、下記組成を有する感光性樹脂をプロピレングリコールモノエチルエーテルアセテートに溶解した感光性樹脂溶液をコンマコーターで均一に塗布し、100℃の熱風対流式乾燥機で5分間乾燥して感光層を形成した。
感光性樹脂の組成:
メタクリル酸/メタクリル酸ベンジル/メタクリル酸メチル共重合樹脂 55重量%
ジペンタエリスリトールヘキサアクリレート 40重量%
ベンゾフェノン 4.7重量%
N,N’-テトラエチル-4,4’-ジアミノベンゾフェノン 0.3重量%
比較用光学部材を形成するために用いた上記感光性樹脂溶液を、膜厚50μmのポリエチレンテレフタレートフィルムの平坦面上にコンマコーターを用いて均一に塗布し、100℃の熱風対流式乾燥機で5分間乾燥して感光層を形成した。その後、平行光線露光機(オーク製作所(株)製、EXM1201)を使用して、露光量5×103J/m2(i線(波長365nm)における測定値)で、ポリエチレンテレフタレートフィルム側及び感光性樹脂組成物層側からそれぞれ紫外線を照射した。これにより、比較用光学部材と同様の材料から形成された膜厚100μmの圧縮弾性率評価用の感光層を形成した。得られた感光層について、実施例1と同様にして圧縮弾性率を測定したところ、70GPaであった。また、この感光層は、大きく歪んだときに塑性変形し、ゴム弾性を実質的に有しないものであった。
実施例1と同様にして、比較用光学部材のT1及びT2を測定し、その差(ΔT)を求めたところ、0.04%であった。
実施例1と同様にして、比較用光学部材のR1及びR2を測定し、それらの差(ΔR)を求めたところ、0.05%であった。
実施例5
薄膜トランジスター(TFT)、光センサー、遮光膜、配線、絶縁膜、配向膜、電極などが実装された基板と、カラーフィルター、ブラックマトリクス、平坦化膜、透明電極、配向膜、シール材、スペーサー材が実装された基板とが対向させて配設され、両基板間に液晶が封入された評価用液晶セルを準備した。この評価用液晶セル上に光学部材(i)をラミネータ(日立化成工業(株)製、商品名HLM-3000型)を用いて積層した。このとき、光学部材(i)の平坦面が評価用液晶セルに接する向きで光学部材(i)を積層した。このときの積層条件は、ロール温度25℃、基板送り速度1m/分、圧着圧力(シリンダ圧力)1×105Paであった。
光学部材(i)に代えて、比較例1で得た比較用光学部材を使用したこと以外は実施例7と同様にして、タッチパネル機能評価用の液晶モジュールを作製した。
Claims (6)
- 片面又は両面が凹凸形状を有するフィルム状のゴム弾性体を備える、タッチパネル用光学部材。
- 前記凹凸形状の最大高さが0.01~50μmである、請求項1記載の光学部材。
- 前記ゴム弾性体の前記凹凸形状を有する表面上に設けられた、前記ゴム弾性体とは屈折率の異なる中間層を更に備える、請求項1又は2記載の光学部材。
- 前記中間層が粘着性を有する、請求項3記載の光学部材。
- 支持体フィルムと、該支持体フィルム上に設けられた請求項1~4のいずれか一項に記載の光学部材とを具備する積層体。
- 請求項1~5のいずれか一項に記載の光学部材の製造方法であって、
型の凹凸表面上に、該凹凸表面から転写された凹凸形状を有する表面を有するフィルム状のゴム弾性体を形成する工程と、
前記ゴム弾性体を前記型から剥離する工程と、
を備える製造方法。
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CN101960413A (zh) | 2011-01-26 |
CN101960413B (zh) | 2013-04-10 |
TW201001255A (en) | 2010-01-01 |
JP5157548B2 (ja) | 2013-03-06 |
JP2009223542A (ja) | 2009-10-01 |
US20110081520A1 (en) | 2011-04-07 |
KR20100113120A (ko) | 2010-10-20 |
KR101215716B1 (ko) | 2012-12-26 |
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