JP2011039590A - Optical member for touch panel, method of manufacturing the same, laminate, and display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical member for touch panel of high heat reliability, which enables obtaining a touch panel which allows input without using a special pen since malfunction is rare under an environment of weak external light, and further allows input in a liquid crystal display device, even if an image is displayed in black, and to provide a display device using this optical member for touch panel. <P>SOLUTION: The optical member for touch panel with a pair of opposite principal planes includes a first layer 11 which has concavo-convex shape on a surface of one side and a second layer 12 joined to a projection 13 in the concavo-convex shape through a joining agent. When the optical member for touch panel 1 is pressed from one of the principal plane side, the first layer 11 and/or the second layer 12 are reversibly deformed, thereby a state of reflection of the light incident from the other side of the principal plane is changed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical member for a touch panel, a manufacturing method thereof, a laminate, and a display device.

  With the increasing functionality of display devices, input devices typified by touch panels have been widely used in recent years. 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.

  As 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. When the film surface is not touched, the transparent conductive films are not in contact with each other due to the spacers. However, when the film surface is touched, 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. On the other hand, since 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. Is low (see Patent Documents 1 and 2).

  The capacitive touch panel has a structure including a single layer of transparent conductive film that detects capacitance. The touched position can be detected by sensing a change in the capacitively coupled electrical signal of the touched portion (see Patent Document 1). 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.

  In the optical sensor system, an optical sensor having a function of sensing light is mounted on a display device. The presence or absence of touch is detected by the optical sensor as a change in the amount of light received. When the display device is a liquid crystal display (LCD), the optical sensor is disposed in a liquid crystal cell, for example. When 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). In the optical sensor system, since 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. In addition, since it is possible to input multiple points, which is difficult with the resistance film method and the capacitance method, application to various applications can be expected. Regarding the optical sensor method, a method of using a light pen having a light source as an input means has also been proposed.

  In the case of a display device such as a liquid crystal display, a method of using reflected light of a backlight as a light source detected by an optical sensor has been proposed. In this method, the backlight light is reflected at the interface between the finger placed on the screen and the touch panel surface, and the position of the touched portion is recognized by the light sensor detecting the reflected light.

JP 2005-530996 A Special table 2007-522586 JP 61-3232 JP JP-A-2-214211

  As described above, the optical sensor touch panel has many advantages such as durability and multipoint input.

  However, in an optical sensor type touch panel, in an environment where the amount of received external light is insufficient, for example, in a dim environment, it is difficult for the optical sensor to detect a change in the amount of received light even if a finger is placed on the touch panel. There is a problem that recognition malfunction is likely to occur. If a light pen is used, this problem can be solved, but a special light pen is required for input, which is not convenient. The method using reflected light from the backlight is considered to be effective to some extent as a measure against the lack of external light. However, this method reflects the backlight even when a finger is placed on the touch panel when the liquid crystal display device displays black. The position of the touched part cannot be detected.

  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. Is to provide a touch panel capable of inputting even when an image is displayed black in a liquid crystal display device, and to provide an optical member for a touch panel with high thermal reliability and a method for manufacturing the same.

  The present invention is an optical member for a touch panel having a pair of opposed main surfaces, and is bonded to a first layer having a concavo-convex shape on one surface and a convex portion in the concavo-convex shape via an adhesive. And when the second layer is pressed from one main surface side, the first layer and / or the second layer is reversibly deformed, so that the light incident from the other main surface side Provided is an optical member for a touch panel in which the state of reflected light changes (hereinafter also simply referred to as “optical member”).

  When a predetermined position of the optical member according to the present invention is pressed from one main surface side, the state of reflected light of light incident from the other main surface side changes. By detecting the change in the reflected light 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. Further, there is no need for special input means such as a light pen or a conductive pen. Furthermore, since the reflected light reflected by the optical member itself is used, by providing the optical member inside the polarizing plate in the liquid crystal display device, the backlight light and its reflected light are effective even in the black display state. Can be used.

  In the optical member according to the present invention, since the surface of the first layer and the surface of the second layer are separated from each other, light entering the optical member is efficiently reflected on these surfaces. And when an optical member is pressed from the one main surface side, the state of the reflected light which changes there changes with a deformation | transformation of a 1st layer and / or a 2nd layer. By constructing a touch panel using this optical member, there are few malfunctions even in an environment where the outside light is weak, input is possible without using a special pen, and furthermore, when an image is displayed black on a liquid crystal display device However, it is possible to obtain a touch panel that allows input. Note that “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.

  Furthermore, the optical member according to the present invention is excellent in resistance to environmental changes such as temperature and atmospheric pressure because the convex portion in the first layer is bonded to the second layer via an adhesive.

  The “uneven shape” in the present invention may be an uneven shape by a spacer as shown in FIG. 1 to be described later, or an irregular uneven shape as shown in FIG.

  The adhesive can be, for example, a silicone composition.

  The first layer and / or the second layer preferably has rubber elasticity. Thereby, even when the optical members are pressed with a weak force, their surfaces can be more easily and reversibly deformed. Thereby, the position can be recognized with higher sensitivity and accuracy. In addition, resistance to repeated use is further improved.

  The optical member which concerns on this invention can be stored in the state of the laminated body which comprises a support body film and the optical member provided on this support body film, for example. By using this laminate, the optical member can be handled with good workability, which can contribute to cost reduction.

  The present invention also provides a method for producing the optical member. The manufacturing method according to the present invention includes a step of forming a first layer having a concavo-convex shape transferred from the concavo-convex surface on one surface on a concavo-convex surface of a mold having a concavo-convex surface; And a step of applying an adhesive to the protruding portion of the peeled first layer, and a step of bonding the second layer to the protruding portion via the adhesive. According to this manufacturing method, the optical member according to the present invention can be efficiently manufactured with good workability, which can contribute to cost reduction.

  According to the present invention, there are few malfunctions even in an environment where the external light is weak, input is possible without using a special pen, and further, even when an image is displayed black on a liquid crystal display device, input is possible. It is possible to provide a highly reliable optical member for a touch panel and a manufacturing method thereof.

It is an end view which shows one Embodiment of the touchscreen which mounted the optical member. It is an end view for demonstrating the function of an optical member. It is an end view for demonstrating the function of an optical member. It is an end view which shows one Embodiment of the manufacturing method of an optical member. It is an end view which shows other embodiment of the touchscreen which mounted the optical member. It is an end view which shows the other aspect of an optical member. It is an end view which shows the other aspect of an optical member. It is an end view which shows the other aspect of an optical member. It is an end view which shows the other aspect of an optical member. It is an end view which shows the other aspect of an optical member. It is an end view which shows the other aspect of an optical member.

  Hereinafter, preferred embodiments of the present invention will be described in detail. However, the present invention is not limited to the following embodiments.

  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 the transparent electrode 41, the alignment film 43, the liquid crystal layer 45, the alignment film 42, the transparent electrode 40, and the color filter 25 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 liquid crystal spacer 47 is provided between the alignment film 42 and the alignment film 43. On the glass substrate 23, 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.

  A touch panel 100 illustrated in FIG. 1 is an input device that has 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 formed by bonding the second layer 12 to the spacer 13 in the first layer 11 integrally molded with the spacer 13 via an adhesive (adhesive layer 19). The optical member 1 is a laminated sheet having a main surface S1 on the first layer 11 side and a main surface S2 on the second layer 12 side. Of the surface 11a of the first layer 11 on the second layer 12 side and the surface 12a of the second layer 12 on the first layer 11 side, both portions not in contact with the spacer 13 are flat. The optical member 1 is arranged in such a direction that the first layer 11 is positioned on the backlight 60 and the optical sensor 52 side. The spacer 13 corresponds to the above-described convex portion.

  A void 2 is formed by the first layer 11, the second layer 12, and the spacer 13. 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. Furthermore, the space | gap 2 may be satisfy | filled with the intermediate | middle layer mentioned later.

  2 and 3 are schematic views for explaining the function of the optical member 1. As shown in FIG. 2, when the screen S100 of the touch panel 100 is not pressed, part of the light emitted from the backlight 60 and entering the optical member 1 is reflected on the surface 12a of the second layer 12. The reflected light L1. Due to the difference in refractive index between the second layer 12 and the gas in the gap 2, the light is easily reflected or scattered on the surface 12 a, and the scattered light received by the photosensor 52 provided on the first main surface S 1 side is received. The amount of reflected light included is relatively large.

  As shown in FIG. 3, when a predetermined position on the screen S100 of the touch panel 100 is touched by the finger F, the optical member 1 is pressed from the main surface S2 side. Thus, the second layer to which the mechanical pressure is locally applied is distorted toward the first layer side, and the first layer 11 and the second layer 12 are pressed against each other. At this time, when the spacer 13 is a hard material having no rubber elasticity, the first layer 11 and / or the second layer 12 is pushed into the spacer 13, and the surface 11a and / or the surface 12a is reversible. When the spacer 13 has rubber elasticity, the spacer 13 is crushed and reversibly deformed, and the surface 11a and / or the surface 12a is also reversibly deformed. As a result, at the position where the surface 12a of the second layer 12 is pressed, the surface 11a and the surface 12a come into contact with each other, the light reflected or scattered there decreases, and the light that has entered the optical member 1 is mainly finger F. And the screen S100. 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. Moreover, the light quantity or the brightness | luminance of the light which permeate | 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.

  Thus, when the optical member 1 is pressed from the main surface S2 side, the amount of reflected light of the light incident from the main surface S1 side changes. By detecting this optical change using an optical sensor provided on the main 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 first layer 11 and / or the second layer 12 may have rubber elasticity capable of reversible deformation with respect to mechanical pressure. Since the first layer 11 and / or the second layer 12 has rubber elasticity, when the optical member 1 is pressed, the surface 11a and / or 12a easily deforms reversibly. Also from the viewpoint of durability of the touch panel, it is preferable that at least one of the first layer 11 and the second layer 12 has rubber elasticity.

  From the viewpoints of durability of the touch panel, operability, malfunction prevention, and the like, the compression elastic modulus of the first layer 11 and / or the second layer 12 is preferably 0.01 to 100 MPa. When 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. When the compression elastic modulus exceeds 100 MPa, the surface 11a is not easily deformed when pressed with a weak pressure, so that it is difficult to convert a change in mechanical pressure into an optical change. From the same viewpoint, 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 meter.
Sample film thickness: 100 μm (compressed in the thickness direction)
Temperature: 25 ° C
Maximum pressure: 0.1 mN / μm ²
Measurement time: 20 seconds Indenter: Circular flat indenter (diameter: 50 μm)

  From the viewpoint that an optical change converted from a mechanical pressure change due to pressing can be efficiently detected and good display quality can be maintained, the first layer 11 and the second layer 12 are made of a highly transparent material. Preferably, it is configured. Specifically, the visible light transmittance of a double-sided flat film having a thickness of 20 μm formed of the material constituting the first layer 11 or the second layer 12 is 70 to 100%, 75 to 98%, 80 to 80%. It is preferably 97%, 83-96% or 85-95%. This visible light transmittance is measured using a double-sided flat film formed by using the material constituting the first layer 11 or the second layer 12, and will be described later. It can be measured by the same method.

  From the viewpoint of effectively expressing the light amount change before and after the deformation of the surface 11a, the absolute value of the difference in refractive index between the first layer 11 and the second layer 12 is preferably 0 to 0.1. From the same viewpoint, when the air gap 2 is formed between the first layer and the second layer as in this embodiment, the refractive index of the first layer 11 and the second layer 12 is 1.3. The above is preferable. These refractive indexes are measured by a known method such as a prism coupling method or a spectroscopic ellipsometry method.

  The material constituting the first layer 11 and / or the second layer 12 having rubber elasticity is preferably various elastomers. Specific examples of 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 (for example, ethylene propylene rubber (EPR), and ethylene propylene dienomonomer (EPDM) rubber), nitrile elastomer, polyacrylic elastomer, polysulfide polymer, silicone elastomer, thermoplastic elastomer, Thermoplastic copolyester, engineered acrylic elastomer, vinyl acetate ethylene copolymer, epichlorohydrin, chlorinated polyethylene, chemically crosslinked Polyethylene was, chlorosulfonated polyethylene, fluorocarbon rubbers, and fluorosilicone rubbers. These may be used alone or in combination of two or more. Among these specific materials having rubber elasticity, the silicone elastomer is particularly preferable from the viewpoint of excellent surface shape deformability and reversibility when the optical member 1 is pressed.

  Examples of the silicone elastomer include peroxide vulcanization type silicone rubber, addition reaction type silicone rubber, photoreactive type silicone rubber, and photo radical polymerization reaction 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 for forming the addition reaction type silicone rubber has two or more monovalent aliphatic unsaturated hydrocarbon groups bonded to silicon atoms in one molecule. Examples of 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. Furthermore, the monovalent aliphatic unsaturated hydrocarbon group may be present either at the end or in the middle of the polyorganosiloxane molecular chain, or may be present in both of them. However, in order to give excellent mechanical properties to the composition after crosslinking, the polyorganosiloxane preferably has a monovalent aliphatic unsaturated hydrocarbon group at both ends of the molecular chain.

  Other 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. Among these, 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. The degree of polymerization of the polyorganosiloxane is not particularly limited, but the composition before cross-linking has good fluidity and workability, and the composition after cross-linking 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. In order to efficiently form a network structure, 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. Further, the siloxane skeleton in the polyorganohydrogensiloxane may be any of linear, branched and 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. When the abundance ratio of hydrogen atoms is less than 0.5, crosslinking tends to be incomplete. When the abundance ratio exceeds 5, the foaming is likely to occur during crosslinking, and the surface state is There is a tendency to decrease.

  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. Examples of platinum compounds include chloroplatinic acid, reaction products of chloroplatinic acid and alcohol, platinum-olefin complexes, platinum-vinylsiloxane complexes, and platinum-phosphine complexes. From the viewpoint of good solubility in polyorganosiloxane and polyorganohydrogensiloxane and good catalytic activity, a reaction product of chloroplatinic acid and alcohol and a platinum-vinylsiloxane complex are preferred. 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.

  The thickness of the first layer 11 and / or the second layer 12 (when the first layer 11 and / or the second layer 12 and the spacer 13 are integrated, the spacer 13 is excluded in the thickness direction. The thickness of the corresponding portion is preferably 1 to 500 μm. When the film thickness of the first layer 11 and / or the second layer 12 is less than 1 μm, when the optical member is pressed from one main surface side, the state of the reflected light reflected there hardly changes and is high. The position of the first layer 11 and / or the second layer 12 tends to be unrecognizable due to sensitivity and accuracy. When the thickness exceeds 500 μm, pressure transmission is weakened when pressure is applied to the optical member. Tend to be difficult to change. From the same viewpoint, the film thickness of the first layer 11 and / or the second layer 12 is more preferably 5 to 400 μm, further preferably 10 to 300 μm.

  From the viewpoint that when the optical member 1 is pressed, it is effectively deformed by a mechanical pressure, and either the first layer 11 and / or the second layer 12 does not substantially exhibit rubber elasticity. It can also be composed of a hard material. Specifically, it is preferably 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, hard silicone resin, and acrylic resin. .

  Next, the spacer 13 will be described.

  A plurality of spacers 13 are provided between the first layer 11 and the second layer 12, and are members that separate them at a predetermined interval. The shape of the spacer 13 is not particularly limited, and may be, for example, a random shape, a line shape, a rectangular shape, a prism shape, a columnar shape, a truncated cone shape, a dot lens shape, or a cylindrical lens shape.

  In the said embodiment, although the example in which the 1st layer 11 and the spacer 13 were integrated was shown, the spacer 13 may be independent of the 1st layer 11 and / or the 2nd layer 12. FIG. . When the spacer 13 is integrated with the first layer 11, the spacer 13 may be simultaneously formed as a part of the first layer 11 when forming the first layer 11. After forming the layer 11 in advance, the surface 11a of the first layer 11 and the spacer 13 may be adhered.

  As described above, the spacer 13 preferably has rubber elasticity capable of reversible deformation with respect to mechanical pressure. Since the spacer 13 has rubber elasticity, when the optical member 1 is pressed, the spacer 13 is easily and reversibly deformed. From the viewpoint that the position can be recognized with durability and high sensitivity of the touch panel, the spacer preferably has rubber elasticity. In addition, from the viewpoint that the optical member according to the present embodiment can be efficiently manufactured with good workability, the spacer is preferably formed simultaneously as part of the first layer. Is the same material as the first layer.

  From the viewpoint of durability of the touch panel, operability, prevention of malfunction, and the like, the compression elastic modulus of the spacer 13 is preferably 0.01 to 100 MPa. When 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. When the compression elastic modulus exceeds 100 MPa, the surface 11a is not easily deformed when pressed with a weak pressure, so that it is difficult to convert a change in mechanical pressure into an optical change. From the same viewpoint, 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 material constituting the spacer 13 is preferably various elastomers. Specific examples of suitable elastomers include all materials suitably used for the first layer and / or the second layer described above. In addition, among the above-described specific materials, all the materials selected as preferable materials for the first layer and / or the second layer are listed as preferable constituent materials for the spacer 13 from the same viewpoint.

  From the viewpoint that when the optical member 1 is pressed from the one main surface side, the state of the reflected light reflected therein changes efficiently, and the position can be recognized with higher sensitivity and accuracy. The height is preferably 1 to 80 μm. Here, “the height of the spacer 13” means the width of the spacer 13 along the thickness direction of the optical member 1 (opposite direction between the first layer 11 and the second layer 12). The distance between the first layer 11 and the second layer 12 in FIG.

  If the height of the spacer 13 is less than 1 μm, the surface 11a of the first layer and the surface 12a of the second layer are likely to come into contact with each other even when no mechanical pressure is applied, and malfunction tends to occur. When the height of the spacer 13 exceeds 80 μm, when pressed with a weak pressure, the surface 11a and the surface 12a are less likely to come into contact with each other and the pressed position tends to be difficult to recognize. From the same viewpoint, the height of the spacer 13 is preferably 5 to 75 μm, 10 to 70 μm, 13 to 65 μm, 15 to 60 μm, 17 to 55 μm, or 20 to 50 μm.

  From the viewpoint that the surface 11a of the first layer and the surface 12a of the second layer can be stably separated from each other via the spacer 13, and from the viewpoint that display quality when the touch panel is formed can be maintained. The maximum width is preferably 1 to 300 μm. Here, the “maximum width of the spacer 13” is the maximum value of the widths of the spacer 13 in the direction orthogonal to the height direction described above.

  When the maximum width of the spacer 13 is less than 1 μm, the surface 11a of the first layer and the surface 12a of the second layer are likely to come into contact with each other even when no mechanical pressure is applied, and malfunction is likely to occur during operation of the touch panel. Tend. When the maximum width of the spacer 13 exceeds 300 μm, when the surface 11a and the surface 12a are pressed with a weak pressure, the surface 11a and the surface 12a are less likely to come into contact with each other, and the pressed position tends to be difficult to recognize. When visually recognized, the display quality tends to deteriorate. From the same viewpoint, the maximum width of the spacer 13 is preferably 5 to 250 μm, 7 to 200 μm, 10 to 150 μm, 15 to 100 μm, 17 to 70 μm, or 20 to 50 μm. Thereby, the surface 11a of the first layer and the surface 12a of the second layer can be partially or completely stably separated from each other via the spacer, and malfunction is less likely to occur during operation of the touch panel. At the same time, the touch panel can be visually recognized with good display quality.

Similarly, it is even better when a touch panel is used from the viewpoint that the surface 11a of the first layer and the surface 12a of the second layer can be stably and effectively separated from each other via the spacer 13. In view of maintaining a good display quality, the number of spacers 13 per unit area on the surface 11a of the first layer is preferably ¹ to 300 / mm ² . When the number of spacers 13 per unit area on the surface 11a of the first layer is less than 1 / mm ² , the surface 11a of the first layer and the surface 12a of the second layer even when no mechanical pressure is applied. Are likely to come into contact with each other, and a malfunction tends to occur when the touch panel is operated. When the number of spacers 13 per unit area on the surface 11a of the first layer exceeds 300 pieces / mm ² , it becomes difficult to contact each other when the surface 11a and the surface 12a are pressed when pressed with a weak pressure, There is a tendency that it becomes difficult to recognize the pressed position, and when it is visually recognized as a touch panel, the display quality tends to deteriorate. From the same viewpoint, the number of the spacers 13 per unit area on the surface 11a of the first layer is 5 to 250 / mm ² , 7 to 200 / mm ² , 10 to 150 / mm ² , 15 to 130. / mm ^2, is preferably 17 to 100 pieces / mm ² or 20 to 90 pieces / mm ^2.

  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 (change in visible light transmittance before and after pressing) 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. Therefore, it is necessary to increase the reflection or scattering in the first layer 11 or the second layer 12. If it does so, there exists a tendency for the display quality as a display apparatus to fall. From the same viewpoint, the change in visible light transmittance before and after pressing is preferably 0.5 to 45%, 1 to 40%, 2 to 35, or 3 to 30%.

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 region 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.
2) irradiate the sample with light in the visible region in the normal direction, and measure the luminance a of the light transmitted through the sample in the range of the measurement viewing angle of 1 ° using a color luminance meter. The optical member is removed from the state, and the luminance b is measured in the same manner.
3) Visible light transmittance T1 when not pressed is calculated by the formula: 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 light in the visible region in the normal direction, and use a color luminance meter to determine the luminance c of the light 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.
6) Visible light transmittance T2 when pressed is calculated by the formula: T2 = (c / d) × 100 (%).
7) The absolute value (ΔT) of the difference between the visible light transmittances T1 and T2 is obtained as the change in the visible light transmittance before and after pressing.

  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 (change in visible light reflectance before and after pressing) 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. Therefore, it is necessary to increase the reflection or scattering in the first layer 11 or the second layer 12. If it does so, there exists a tendency for the display quality as a display apparatus to fall. From the same viewpoint, the change in the visible light reflectance before and after pressing is preferably 0.5 to 48%, 1 to 45%, 2 to 43%, or 3 to 40%.

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.
2) The visible light reflectance R1 when the optical member is not pressed is calculated by the formula: R1 = (b ′ / a ′) × 100 (%).
3) While the load of 5 × 10 ³ Pa is applied between the glass substrate and the disk-shaped glass plate, the brightness c ′ of the reflected light is measured by the same method as in 1).
4) The visible light reflectance R2 when the optical member is pressed is calculated by the formula: R2 = (c ′ / a ′) × 100 (%).
5) The absolute value (ΔR) of the difference between the visible light reflectances R1 and R2 before and after pressing is obtained as the change in the visible light reflectance before and after pressing.

  The void 2 may be filled with an intermediate layer. Thereby, compared with the case where an intermediate | middle layer is not provided, the touch panel which is further excellent in durability with respect to the change of use environment can be obtained.

  The absolute value (Δn) of the difference between the refractive index of the second layer 12 and the refractive index of the intermediate layer is preferably 0.01 to 1.0. When 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. Moreover, when 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. From the same viewpoint, the absolute value of the difference in refractive index 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 preferably has adhesiveness. The resin used for forming the adhesive intermediate layer is not particularly limited as long as it exhibits adhesiveness to the first layer 11 or the second layer 12. Type acrylic resin, acrylic monomer, silicone resin, fluororesin and polyvinyl alcohol resin. These can be used alone or in combination of two or more.

  As the acrylic resin, a copolymer containing an unsaturated monomer exhibiting a low glass transition temperature is preferable. Examples of 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. Other 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- Ethyl hexyl, metac 2-ethylhexyl phosphate, octyl acrylate, octyl methacrylate, nonyl acrylate, nonyl methacrylate, decyl acrylate, decyl methacrylate, dodecyl acrylate, dodecyl methacrylate, tetradecyl acrylate, tetradecyl methacrylate, hexadecyl acrylate, Hexadecyl methacrylate, octadecyl acrylate, octadecyl methacrylate, eicosyl acrylate, eicosyl methacrylate, docosyl acrylate, docosyl methacrylate, cyclopentyl acrylate, cyclopentyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, cycloheptyl acrylate, methacrylic acid Cycloheptyl acid, benzyl acrylate, benzyl methacrylate, phenyl acrylate, phenyl methacrylate , Methoxyethyl acrylate, methoxyethyl methacrylate, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, diethylaminoethyl acrylate, diethylaminoethyl methacrylate, dimethylaminopropyl acrylate, dimethylaminopropyl methacrylate, 2-chloroethyl acrylate , 2-chloroethyl methacrylate, 2-fluoroethyl acrylate, 2-fluoroethyl methacrylate, styrene, α-methylstyrene, cyclohexylmaleimide, dicyclopentanyl acrylate, dicyclopentanyl methacrylate, vinyl toluene, vinyl chloride , Vinyl acetate, N-vinylpyrrolidone, butadiene, isoprene, and chloroprene. These can be used alone or in combination of two or more.

  The cross-linked acrylic resin is a copolymer containing an unsaturated monomer having a functional group such as acrylic acid, methacrylic acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, acrylamide, and acrylonitrile as a copolymerization component. Is crosslinked with a crosslinking agent.

  As said crosslinking agent, well-known crosslinking agents, such as an isocyanate type, a melamine type, and an epoxy type, 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 (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 first layer 11 or the second layer. From the viewpoint of adhesiveness to the layer 12, it is preferably 1000 to 300000, and more preferably 5000 to 150,000.

  The adhesive resin can use a monomer from the viewpoint of developing high fluidity and effectively deforming the surface shape of the first layer or the second layer. Examples of the monomer include polyethylene glycol diacetate, polypropylene glycol diacetate, urethane monomer, nonylphenyl dixylene acrylate, nonylphenyl dixylene methacrylate, γ-chloro-β-hydroxypropyl-β′-acryloyloxyethyl-o. -Phthalate, γ-chloro-β-hydroxypropyl-β'-methacryloyloxyethyl-o-phthalate, β-hydroxyethyl-β'-acryloyloxyethyl-o-phthalate, β-hydroxyethyl-β'-methacryloyloxyethyl -O-phthalate, β-hydroxypropyl-β'-acryloyloxyethyl-o-phthalate, β-hydroxypropyl-β'-methacryloyloxyethyl-o-phthalate, o-phenylpheno An unsaturated monomer used for luglycidyl ether acrylate, o-phenylphenol glycidyl ether methacrylate, or acrylic resin can be used. These can be used alone or in combination of two or more.

  The glass transition temperature (Tg) of the intermediate layer is preferably −20 ° C. or lower. When the glass transition temperature of the intermediate layer is higher than −20 ° C., the adhesiveness is lowered, and there is a tendency that an appropriate adhesive force to the first layer 11 and the second layer 12 cannot be obtained.

  The thickness of the intermediate layer (the thickness of the portion excluding the portion filled in the recess formed from the spacer 13 and the first layer 11) is preferably 1 to 50 μm. When the thickness of the intermediate layer is less than 1 μm, there is a tendency to entrap bubbles when laminating the first layer or the second layer. When the thickness exceeds 50 μm, pressure is transmitted when the touch panel is touched. Since it becomes difficult, there exists a tendency for the surface shape of the 1st layer 11 to become difficult to change. From the same viewpoint, the thickness of the intermediate layer is more preferably 2 to 40 μm, and further preferably 3 to 30 μm.

  The adhesive used for joining the spacer 13 and the second layer 12 can be appropriately selected according to the materials of the first layer 11 and the second layer 12, but it is preferable to use a silicone composition.

  Although it does not restrict | limit especially as a silicone composition, A self-adhesive silicone composition is preferable. Examples of the silicone composition include condensation curable silicone compositions, addition curable silicone compositions, organic peroxide curable silicone compositions, and ultraviolet curable silicone compositions. For example, KE-45TS, KE-1800T (A / B), KE-1212 (A / B / C), KE-951U or KE-1955 (A / B) (manufactured by Shin-Etsu Chemical Co., Ltd.), XE13-B3208, TSE3251-C or TSE3033 (A / B) (made by Momentive Performance Materials Japan GK). These can be used alone or in combination of two or more.

  The thickness of the silicone composition used for bonding is not particularly limited, but may be a thickness corresponding to the height of the spacer, and can be usually 0.001 to 20 μm. From the viewpoint of adhesiveness to the layer 12, the thickness is preferably 0.005 to 10 μm.

  As a method of applying the silicone composition to the end portion (convex portion) of the spacer 13, a conventional method according to the type of the composition can be adopted, and the silicone composition is applied to the spacer 13 as it is, or as necessary. In order to obtain a constant film thickness, it can be diluted with a solvent and applied to the second layer 12. The coating method can be appropriately selected from known methods such as coater coating, brush coating, spray coating, calendar molding, dip coating, and screen printing according to the coating speed and the viscosity of the silicone composition. The curing method after coating can be cured by a normal method according to the curing method of the composition.

  You may use the optical member 1 in the state of the laminated body which comprises a support body film and the optical member 1 provided on this support body film. Examples of the support film include a film having a thickness of about 5 to 100 μm 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 first layer 11 or the second layer 12.

  A cover film may be further laminated on the first layer 11 or the second layer 12. Examples of the cover film include films having a thickness of about 5 to 100 μm made of polyethylene, polypropylene, polyethylene terephthalate, polycarbonate, triacetyl cellulose, and the like. A resin layer having adhesiveness or adhesiveness may be provided between the cover film and the first layer 11 or the second layer 12.

  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 first layer 11 having a convex spacer 13 transferred from the surface having the concave portion on the surface 11a on the surface having the concave portion of the mold 7. A step of peeling the first layer 11 from the mold 7, and a step of laminating the second layer 12 on the surface of the spacer 13 integrated with the peeled first layer 11. Hereinafter, the manufacturing method will be described in detail.

  As shown in FIG. 4 (a), a liquid material containing the components constituting the first layer 11 is applied onto the surface having the concave portions of the mold 7 using the roll 8. The applied liquid material is changed into a solid state by heat or light (FIG. 4B). Thereafter, the first layer 11 is peeled off from the mold 7 (FIG. 4C).

  Instead of this method, a liquid material for forming the first layer 11 is applied to a flat substrate, and a mold having a surface having a recess formed thereon is pressed, and the liquid material is solidified in that state. It is also possible to adopt a method of changing. In addition, another mold having a concave surface is laminated on the liquid material applied on the mold 7, and the first layer 11 having both concave and convex shapes is formed by changing the liquid material into a solid state in that state. You can also get

  The mold 7 is a film having a large number of fine recesses formed on the surface. As the mold 7, for example, by a method in which an original mold having a convex 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. Obtainable. Moreover, it can also obtain by the method of pressing the flat surface of a film directly on the original | mold which has a convex part surface, and transferring a concave part to the film surface. Or a recessed part can also be formed in the photosensitive resin composition layer formed on the flat support body film with the photolithographic method.

  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-cut to form a resist pattern, on which a vacuum deposition method is applied. 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. . At this time, the shape of the convex portion can be controlled to a random shape, a line shape, a rectangular shape, a prism shape, a columnar shape, a truncated cone shape, a dot lens shape, a cylindrical lens shape, etc. according to the mask pattern shape or the resist pattern shape. The shape of the original convex portion is transferred to the surface of the first layer 11 as a spacer 13.

  By performing metal plating such as copper or nickel on the surface of the conductive metal, it is possible to produce a prototype in which a large number of fine recesses are formed on the surface. 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. It is possible to form a large number of recesses having a part of. By selecting 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. In this case, the prototype may be a flat plate or a roll having a curved surface. Moreover, the recessed part may be arrange | positioned at random and may be arrange | positioned according to the defined rule.

  As a method for applying the liquid material 11 for forming the first layer 11, 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. .

  If the liquid for forming the first layer 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.

  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.

  When a cover film is present on the optical member 1, the adhesive film 31 is placed on the liquid crystal cell 4 in such a direction that the first layer 11 is located on the liquid crystal cell 4 side after the cover film is removed. Through the liquid crystal cell 4. In the case of lamination, it is preferable to perform pressure bonding with a pressure roll.

  The pressure roll may be provided with a heating means so that it can be heat-pressure bonded. 10-100 degreeC is preferable, as for the heating temperature in the case of thermocompression bonding, 20-80 degreeC is more preferable, and 30-60 degreeC is still more preferable. When 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.

In addition, the pressure at the time of 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.

  The retardation plate 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 | stacked on the opposite side to the optical member 1 of the liquid crystal cell 4 with the same method.

  There is no restriction | limiting in particular as a method of mounting the backlight 60 in the liquid crystal cell 4, A well-known method can be utilized. 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.

  The present invention is not limited to the embodiment described above, and various modifications can be made without departing from the spirit of the present invention.

  FIG. 5 is a view for explaining another embodiment of the optical member according to the present invention.

  The touch panel 200 shown in FIG. 5 has the same configuration as the touch panel 100 except that the uneven shape in the first layer 11 of the optical member 1 is an irregular uneven shape. In the optical member 1, only the irregular projections having a high height are joined to the second layer 12 by the adhesive layer 19.

  The uneven shape of the surface 11a of the first layer 11 in the touch panel 200 may be a shape that can reflect or scatter a part of 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 μm. Thereby, the light incident from the backlight 60 is particularly efficiently reflected and can be effectively detected by the optical sensor 52. Further, the position where the touch panel 100 is touched can be recognized with higher sensitivity. From the same viewpoint, the maximum height of the concavo-convex shape is preferably 0.1 to 45 μm, 0.5 to 40 μm, 0.7 to 35 μm, or 1 to 30 μm. From the same viewpoint, the distance between the apexes of adjacent convex portions is preferably 0.01 to 150 μm, 0.1 to 100 μm, 0.5 to 90 μm, 0.7 to 70 μm, or 1 to 50 μm. .

  In addition, the 1st layer 11 which has irregular uneven | corrugated shape can be produced by using what changed suitably the uneven | corrugated shape in the type | mold 7 of FIG.

  Moreover, the thing of the aspect shown by the end view of FIGS. 6-11 may be sufficient as the optical member which concerns on this invention. The optical member shown in FIGS. 8 to 11 corresponds to the above-mentioned “laminate”, and can be used as an optical member by peeling off the protective film (support film).

  The optical member 110 shown in FIG. 6 is a spacer of the first layer 11 in which the non-biasable film 14a, the primer layer 16a, and the elastomer layer (rubber layer) 15a in which the spacer 13 is integrally molded are laminated in this order. 13 has the structure joined to the 2nd layer 12 which consists of a non-biasing film 14b through the adhesive bond layer 19. FIG.

  In the optical member 120 shown in FIG. 7, the spacer 13 of the first layer 11 formed by laminating the non-biasable film 14a, the primer layer 16a, and the elastomer layer 15a integrally formed with the spacer 13 in this order is bonded. Through the agent layer 19, the elastomer layer 15b, the primer layer 16b, and the non-biasing film 14b are laminated on the elastomer layer 15b side, and the second layer 12 is laminated in this order.

  The optical member 130 shown in FIG. 8 includes a spacer 13 of a laminate in which a protective film 18a, an adhesive layer 17a, and an elastomer layer 15a (corresponding to the first layer 11) integrally formed with the spacer 13 are laminated in this order. However, it has the structure joined to the 2nd layer 12 which consists of a non-biasing film 14b through the adhesive bond layer 19. FIG.

  The optical member 140 shown in FIG. 9 has a laminated spacer 13 in which a protective film 18a, an adhesive layer 17a, and an elastomer layer 15a (corresponding to the first layer 11) in which the spacer 13 is integrally formed are laminated in this order. However, a configuration in which the elastomer layer 15b, the primer layer 16b, and the non-biasing film 14b are laminated in this order via the adhesive layer 19 and the elastomer layer 15b side is joined. Have.

  In the optical member 150 shown in FIG. 10, the non-biasable film 14a, the primer layer 16a, and the elastomer layer 15a in which the spacer 13 is integrally molded are laminated in this order, and the spacer 13 of the first layer 11 is bonded. A structure in which an elastomer layer 15b (corresponding to the second layer 12), an adhesive layer 17b, and a protective film 18b are laminated in this order via the agent layer 19 and the elastomer layer 15b side are joined. Have.

  The optical member 160 shown in FIG. 11 has a laminated spacer 13 in which a protective film 18a, an adhesive layer 17a, and an elastomer layer 15a (corresponding to the first layer 11) in which the spacer 13 is integrally molded are laminated in this order. However, the adhesive layer 19 is joined to the laminated body in which the elastomer layer 15b (corresponding to the second layer 12), the adhesive layer 17b, and the protective film 18b are laminated in this order on the elastomer layer 15b side. Have a configuration.

  The non-depolarizing films 14a and 14b each maintain a polarization plane when light passes through the film, and in the optical member, the polarization ability does not change and the support has flexibility. Functions as a film. The film is usually used as a film having a thickness of about 5 to 100 μm. Examples of the material include polyethylene terephthalate, polycarbonate, polyethylene, polypropylene, polyether naphthalate, polyethersulfone, triacetylcellulose, various cycloolefin polymers, and the like. It is done.

  The elastomer layers 15a and 15b can be made of the same material as the elastomer in the first layer described above.

  The primer layers 16a and 16b are layers that function as adhesives for fixing the elastomer layer and the non-biased film, respectively. Examples include various reactive silicone resins, and commercially available products include ME151 and ME153. , XP81-B0016, XP81-C0431, ME121, ME123, YP9341 or XP80-A5363 (made by Momentive Performance Materials Japan GK), Primer C, Primer MT, Primer T, Primer D2, Primer U, Primer S, Primer No. 4, X-33-197 or X-40-3501 (manufactured by Shin-Etsu Chemical Co., Ltd.).

  The adhesive layers 17a and 17b are layers for fixing two adjacent layers, for example, various adhesive silicone resins and the like, and as commercially available products, TSR1512, TSR1516, XR37-B9204, YR3286, YR3340, TSR1560, XR37-B6722 or PSA610-SM (made by Momentive Performance Materials Japan GK), X-40-3291 (made by Shin-Etsu Chemical Co., Ltd.), etc. are mentioned.

  The protective films 18a and 18b are films for protecting adjacent layers, and examples thereof include polyethylene, polyethylene terephthalate, polypropylene, triacetyl cellulose, polycarbonate, polyether sulfone, and polyether naphthalate. , Film binders 50E-0010SF, 50E-0010YC, 50E-0010YA or 50E-0010YB (manufactured by Fujimori Kogyo Co., Ltd.).

  Moreover, the display apparatus provided with the optical member according to the present invention may be provided with a light source and an optical sensor, and is not limited to the liquid crystal display apparatus. Examples of other display devices include a plasma display, an organic electroluminescence display, and electronic paper.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

Example 1
Preparation of first layer (L-1) A photosensitive resin having the following composition was dissolved in propylene glycol monoethyl ether acetate to prepare a photosensitive resin solution.
Composition of photosensitive resin:
Acrylic acid / butyl acrylate / vinyl acetate copolymer resin 33% by weight
Butyl acrylate 53 wt%
8% by weight vinyl acetate
Acrylic acid 2% by weight
Hexanediol acrylate 1% by weight
Benzoin isobutyl ether 3% by weight

  This photosensitive resin solution was uniformly coated on a 50 μm 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.

Next, while pressing a roll-shaped master having an irregular concavo-convex pattern, 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 first layer (L-1).

  On the uneven surface of the photosensitive layer, an addition reaction type silicone resin solution (product name TSE3450, manufactured by Momentive Performance Materials Japan LLC) was uniformly applied using a comma coater. Then, it heated for 30 minutes with a 100 degreeC hot-air convection dryer, and the solid silicone rubber layer (1st layer (L-1)) which one side is flat and the other side has uneven | corrugated shape was formed. .

  The obtained first layer (L-1) is peeled from the photosensitive layer, and the maximum height of the uneven shape and the film thickness (thickness of the portion excluding the uneven shape) are made by Kosaka Laboratory Co., Ltd. It measured using the shape measuring apparatus (Surfcoder SE-30D type). As a result, the maximum height was 35 μm and the film thickness was 50 μm.

Preparation of second layer (L-2) An addition reaction type silicone resin solution (product name TSE3450, manufactured by Momentive Performance Materials Japan G.K.) The coater was applied uniformly. Then, the solid silicone rubber layer (2nd layer (L-2)) with flat both surfaces was formed by the heating for 30 minutes using a 100 degreeC hot air convection type dryer.

  Next, the obtained second layer (L-2) was peeled from the polyethylene terephthalate film, and the thickness thereof was measured using a surface shape measuring device (Surfcoder SE-30D type) manufactured by Kosaka Laboratory. However, it was 100 μm.

Production of Optical Member (i) A triacetyl cellulose film having a smooth surface was prepared as a support film. On the support film, the first layer (L-1) obtained above was laminated using a laminator (manufactured by Hitachi Chemical Co., Ltd., trade name: HLM-3000 type). At this time, the first layer was laminated so that the flat surface thereof was in contact with the triacetyl cellulose film. The lamination conditions were a roll temperature of 25 ° C., a substrate feed rate of 1 m / min, and a pressure bonding pressure (cylinder pressure) of 1 × 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.

  Next, a silicone composition (manufactured by Shin-Etsu Chemical Co., Ltd., trade name KE-1800T) was applied to the convex portion of the first layer (L-1) with a thickness of 5 μm, and the second layer obtained above. (L-2) was laminated with the same apparatus and conditions as those for the first layer (L-1). At this time, the second layer (L-2) was laminated such that the uneven surface of the first layer (L-1) was in contact with the second layer (L-2). Thereafter, the optical member (i) was formed on the support film by heat curing for 60 minutes using a hot air convection dryer at 80 ° C.

Thermal shock test of optical member (i) Substrate mounted with thin film transistor (TFT), optical sensor, light shielding film, wiring, insulating film, alignment film, electrode, etc., color filter, black matrix, planarization film, transparent electrode A liquid crystal cell for evaluation was prepared in which an alignment film, a sealing material, and a substrate on which a spacer material was mounted were placed facing each other and liquid crystal was sealed between the substrates. The optical member (i) was laminated on the liquid crystal cell for evaluation under the same apparatus and conditions as described above. At this time, an adhesive layer for the liquid crystal cell is previously laminated on the substrate on which the color filter of the evaluation liquid crystal cell is formed, and the triacetyl cellulose film on the first layer (L-1) side is formed on the adhesive layer. The optical member (i) was laminated in such a direction as to contact.

  On the second layer (L-2) of the optical member (i) laminated on the evaluation liquid crystal cell, a polarizing plate was laminated by the same laminating method as above to obtain a sample for a thermal shock test. . As a result of the thermal shock test (−30 ° C./85° C. 100 cycles), the first layer (L-1) and the second layer (L-2) do not peel off and have high thermal reliability. Was confirmed.

Example 2
Production of first layer (L-3) The same photosensitive resin solution as in Example 1 was uniformly applied onto a polyethylene terephthalate film having a thickness of 50 μm 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.

Next, while pressing a roll-shaped master having an irregular concavo-convex pattern, 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 first layer (L-3).

  On the uneven surface of the photosensitive layer, an addition reaction type silicone resin solution (product name TSE3450, manufactured by Momentive Performance Materials Japan LLC) was uniformly applied 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 (1st layer (L-3)) which one side is flat and the other side has uneven | corrugated shape. .

  The obtained first layer (L-3) was peeled from the photosensitive layer, and the maximum height and film thickness (thickness of the portion excluding the uneven surface) of the uneven surface were measured in the same manner as in Example 1. The maximum height was 15 μm and the film thickness was 100 μm.

Preparation of second layer (L-4) An addition reaction type silicone resin solution (product name TSE3450, manufactured by Momentive Performance Materials Japan G.K.) was added to the surface of a smooth surface of a polyethylene terephthalate film having a smooth surface. The coater was applied uniformly. Then, the solid silicone rubber layer (2nd layer (L-4)) with flat both surfaces was formed by heating for 30 minutes using a 100 degreeC hot-air convection dryer.

  Next, the obtained second layer (L-4) was peeled from the polyethylene terephthalate film, and its thickness was measured in the same manner as in Example 1. As a result, it was 50 μm.

Preparation of optical member (ii) A triacetyl cellulose film having a smooth surface was prepared as a support film. On the support film, the first layer (L-3) obtained above was laminated in the same manner as in Example 1. At this time, the first layer was laminated so that the flat surface thereof was in contact with the triacetyl cellulose film.

  Next, a silicone composition (product name: TSE3033, manufactured by Momentive Performance Materials Japan LLC) was applied to the convex portion of the first layer (L-3) with a thickness of 3 μm, and the second obtained above. Layer (L-4) was laminated in the same manner as in Example 1. At this time, the second layer (L-4) was laminated such that the uneven surface of the first layer (L-3) was in contact with the second layer (L-4). Thereafter, the optical member (ii) was formed on the support film by heat curing for 60 minutes using a hot air convection dryer at 80 ° C.

Thermal shock test of optical member (ii) A sample for a thermal shock test was obtained in the same manner as in Example 1 except that the optical member (ii) was used instead of the optical member (i). As a result of the thermal shock test (−30 ° C./85° C. 100 cycles), there is no peeling between the first layer (L-3) and the second layer (L-4), and it has high thermal reliability. Was confirmed.

Example 3
Production of first layer (L-5) The same photosensitive resin solution as in Example 1 was uniformly applied onto a polyethylene terephthalate film having a thickness of 50 μm 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.

Next, while pressing a roll-shaped master having an irregular concavo-convex pattern, 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 first layer (L-5).

  On the uneven surface of the photosensitive layer, an addition reaction type silicone resin solution (product name TSE3450, manufactured by Momentive Performance Materials Japan LLC) was uniformly applied 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 (1st layer (L-5)) which one side is flat and the other side has uneven | corrugated shape. .

  When the obtained 1st layer (L-5) was peeled from the photosensitive layer and the maximum height and film thickness (thickness of the part except an uneven surface) of the uneven surface were measured like Example 1, The maximum height was 25 μm and the film thickness was 100 μm.

Preparation of second layer (L-6) Addition reaction type silicone resin solution (product name TSE3032, manufactured by Momentive Performance Materials Japan G.K.) on the smooth surface of a polyethylene terephthalate film having a smooth surface, The coater was applied uniformly. Then, the solid silicone rubber layer (2nd layer (L-6)) with flat both surfaces was formed by heating for 30 minutes using a 100 degreeC hot-air convection dryer.

  Next, the obtained second layer (L-6) was peeled from the polyethylene terephthalate film, and its thickness was measured in the same manner as in Example 1. As a result, it was 100 μm.

Production of optical member (iii) A triacetylcellulose film having a smooth surface was prepared as a support film. On the support film, the first layer (L-5) obtained above was laminated in the same manner as in Example 1. At this time, the first layer was laminated so that the flat surface thereof was in contact with the triacetyl cellulose film.

  Next, a silicone composition (product name: TSE3251-C, manufactured by Momentive Performance Materials Japan G.K. Co., Ltd.) was applied to the convex portion of the first layer (L-5) with a thickness of 7 μm and obtained above. The second layer (L-6) was laminated in the same manner as in Example 1. At this time, the second layer (L-6) was laminated such that the uneven surface of the first layer (L-5) was in contact with the second layer (L-6). Thereafter, the optical member (iii) was formed on the support film by heat curing for 60 minutes using a hot air convection dryer at 80 ° C.

Thermal shock test of optical member (iii) A sample for a thermal shock test was obtained in the same manner as in Example 1 except that the optical member (iii) was used instead of the optical member (i). As a result of the thermal shock test (−30 ° C./85° C. 100 cycles), the first layer (L-5) and the second layer (L-6) do not peel off and have high thermal reliability. Was confirmed.

Comparative Example 1
Preparation of optical member for comparison A triacetyl cellulose film having a smooth surface was prepared as a support film. On the support film, the first layer (L-5) obtained above was laminated in the same manner as in Example 1. At this time, the first layer was laminated so that the flat surface thereof was in contact with the triacetyl cellulose film.

  Next, the second layer (L-6) obtained above was laminated on the surface having the uneven shape of the first layer (L-5) without using an adhesive such as a silicone composition. An optical member for use was obtained. At this time, the second layer (L-6) was laminated in such a direction that the second layer (L-6) was in contact with the surface having the irregular shape of the first layer (L-5).

Thermal shock test of comparative optical member A sample for thermal shock test was obtained in the same manner as in Example 1 except that the comparative optical member obtained in Comparative Example 1 was used instead of the optical member (i). . As a result of the thermal shock test (−30 ° C./85° C. 100 cycles), the second layer (L-6) was warped, floated, and inferior in thermal reliability.

  DESCRIPTION OF SYMBOLS 1 ... Optical member, 2 ... Space | gap, 4 ... Liquid crystal cell, 11 ... 1st layer, 12 ... 2nd layer, 19 ... Adhesive layer, 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 Transistors 52... Optical sensor 54. Insulating film 60. Backlight 100, 200 Touch panel S 1, S 2 Main surface of optical member S 100 S 200 Screen

Claims (5)

An optical member for a touch panel having a pair of opposed main surfaces,
A first layer having a concavo-convex shape on one surface, and a second layer bonded to a convex portion in the concavo-convex shape via an adhesive,
When pressed from one main surface side, the first layer and / or the second layer are reversibly deformed, thereby reflecting the light incident from the other main surface side. An optical member for touch panels that changes.   The touch panel optical member according to claim 1, wherein the adhesive is a silicone composition.   The optical member for a touch panel according to claim 1 or 2, wherein the first layer and / or the second layer has rubber elasticity.   The laminated body which comprises a support body film and the optical member as described in any one of Claims 1-3 provided on this support body film. It is a manufacturing method of the optical member for touchscreens as described in any one of Claims 1-3,
Forming the first layer having a concavo-convex shape transferred from the concavo-convex surface on one surface on the concavo-convex surface of the mold having the concavo-convex surface;
Peeling the first layer from the mold;
Applying an adhesive to the convex portions of the peeled first layer;
Bonding the second layer to the convex portion via an adhesive;
A manufacturing method comprising:

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