JP2011191368A - Antireflection member, method for manufacturing antireflection member, electro-optical device, and electronic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an antireflection member which has antireflection performance and dustproof performance. <P>SOLUTION: The antireflection member 1 is equipped with a plurality of drill bodies 10 each having protrusion parts 12 which are formed on the surface of a base material 11 having light transmissivity; firm adhesion layers 14 formed at least on the top parts 13a of the protrusion parts; and dustproof layers 15 formed on the firm adhesion layers. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an antireflection member, a method for manufacturing the antireflection member, an electro-optical device, and an electronic apparatus.

  For example, an antireflection member having a moth-eye structure is known as a member for preventing reflection of light on the surface of an electro-optical device such as a liquid crystal display. This moth-eye structure has an uneven surface consisting of a continuous pattern of fine conical shapes, has little dependency on the incident angle of light, and can exhibit a good antireflection effect over a wide wavelength band (for example, , See Patent Document 1).

JP 2004-287238 A

  However, in the electro-optical device to which the antireflection member having such a moth-eye structure is applied, when dust or dirt adheres to the surface, the light transmittance is reduced and the optical characteristics are deteriorated. was there.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

  Application Example 1 An antireflection member according to this application example includes a convex portion formed on a light-transmitting substrate surface, an adhesion layer formed on at least the top of the convex portion, and the adhesion layer. A plurality of cones having a dustproof layer formed are provided.

  According to this configuration, a dustproof function is achieved by the dustproof layer formed on the top surface of the cone. For example, when the antireflection member is applied to an optical device or the like, the optical characteristics are maintained for a long period of time. be able to. Moreover, the contact | adherence layer is provided in the top part of the convex part of a base material. The adhesion layer can also be said to be an intermediate layer for closely adhering the base material and the dustproof layer. By this adhesion layer, the base material and the dustproof layer are in close contact, and a dustproof effect can be obtained over a long period of time. Furthermore, by having an adhesion layer on the top of the convex part of the base material, even if a finger or an object contacts the tip of the cone, damage is prevented by the elastic force of the adhesion layer, improving handling Can be made.

  Application Example 2 In the antireflection member according to the application example described above, the thickness of the adhesion layer formed on the top of the convex portion is greater than the thickness of the adhesion layer formed on the skirt portion of the convex portion. It is characterized by.

  According to this configuration, it is possible to easily form a cone having a sharp tip. And the antireflection member which has antireflection performance and dustproof performance can be formed.

  Application Example 3 In the antireflection member according to the application example described above, a molding die corresponding to the surface shape of the cone is added to a member having an adhesive agent that becomes the adhesion layer formed on the base material surface. By pressing, the adhesion layer thicker than the thickness of the adhesion layer formed at the bottom of the adhesion layer is formed on the top of the convex portion.

  According to this configuration, when a base material having an adhesive agent is pressed, the adhesive agent flows into a mold corresponding to the surface shape of the cone, so that a sharp cone can be easily formed. Also, a plurality of cones having a uniform shape can be easily formed.

  Application Example 4 A method for manufacturing an antireflection member according to this application example is a method for manufacturing an antireflection member having a plurality of cones, and is an adhesive that forms an adhesion layer on a substrate having translucency. An adhesive agent applying step for applying a dust, an antidust agent applying step for applying a dustproof agent to be a dustproof layer on the surface of the mold corresponding to the surface shape of the cone, and the surface toward which the adhesive agent is applied. The mold is pressurized, and the convex portion formed on the base material and the thickness of the adhesive layer formed on the top of the convex portion are larger than the thickness of the adhesive layer formed on the bottom portion of the convex portion. And a cone forming step of forming the cone having the adhesion layer formed thick and the dustproof layer formed on the adhesion layer.

  According to this structure, a convex part is formed by pressurizing a base material with a shaping | molding die. At this time, the adhesive agent flows in the direction of the convex portion of the base material, and an adhesive layer having a thickness larger than that of the bottom portion of the convex portion is formed on the top of the convex portion. And the dustproof agent apply | coated to the shaping | molding die is transcribe | transferred on an adhesion | attachment layer as a dustproof layer on the top part of the convex part of a base material. Thereby, a cone with a sharp tip can be formed uniformly. Moreover, the cone which has a uniform shape in any area | region can be formed by using a shaping | molding die. In addition, for example, when the material of the dust-proof layer is formed by sputtering after forming the convex portion, the film is not formed on the top portion of the convex portion, and tends to be formed in the skirt direction of the convex portion. . Therefore, in this case, the aspect ratio of the cone may be reduced, and the antireflection effect may be reduced. However, as described above, the aspect ratio can be maintained by forming the cone by transferring the dust-proof layer using the mold. Furthermore, the dust-proof layer can be formed collectively in one process, and the number of processing steps can be reduced.

  Application Example 5 An electro-optical device according to this application example includes the antireflection member or the antireflection member manufactured by the method of manufacturing the antireflection member.

  According to this configuration, it is possible to provide an electro-optical device that is excellent in optical characteristics and excellent in antireflection performance and dustproof performance. Examples of the electro-optical device in this case include LCD (liquid crystal display), OLED (organic electroluminescence display), EPD (electrophoretic display), and PDP (plasma display).

  Application Example 6 An electronic apparatus according to this application example includes the above-described electro-optical device.

  According to this configuration, it is possible to provide an electronic device that is excellent in optical characteristics and excellent in antireflection performance and dustproof performance. Examples of the electronic device in this case include a projector, a portable terminal, a personal computer, and a television receiver.

Schematic which shows the structure of an antireflection member. Process drawing which shows the manufacturing method of an antireflection member. FIG. 3 is a cross-sectional view illustrating a configuration of a liquid crystal display as an electro-optical device. The perspective view which shows the structure of the mobile telephone as an electronic device.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described with reference to the drawings. In addition, each member in each drawing is illustrated with a different reduction for each member in order to make the size recognizable on each drawing.

(Configuration of antireflection member)
First, the configuration of the antireflection member will be described. FIG. 1 is a schematic view showing the configuration of the antireflection member. As shown to Fig.1 (a), the reflection preventing member 1 has the convex part 12 formed in the surface of the base material 11 which has translucency, and the contact | adherence layer 14 formed in at least the top part 13a of the convex part 12. A plurality of cones 10 having a dustproof layer 15 formed on the adhesion layer 14 are provided. The cone 10 in the present embodiment has a quadrangular pyramid shape and has a triangular cross section. The antireflection member 1 is formed by connecting a plurality of cones 10 and has a concave-convex shape (moth eye structure).

  A thermoplastic or thermosetting light transmissive resin can be applied to the substrate 11. These resins are made of, for example, a material such as polymethyl methacrylate (PMMA).

  The adhesion layer 14 is an intermediate layer provided to form the dust-proof layer 15 on the base material 11 and is, for example, TMA (trimethyl alumina). As shown in FIG. 1A, in this embodiment, the thickness (T1) of the adhesion layer 14 formed on the top portion 13a of the convex portion 12 of the base material 11 is formed on the skirt portion 13b of the convex portion 12. It is thicker than the thickness (T2) of the adhesion layer 14. That is, the adhesion layer 14 formed on the top portion 13 a of the convex portion 12 is formed thicker than the adhesion layer 14 formed in the concave portion between the adjacent convex portions 12. In such a configuration, by pressing a forming die corresponding to the surface shape of the cone 10 against a member having an adhesive agent that becomes the adhesive layer 14 applied to the surface of the base material 11, It becomes possible to form the adhesion layer 14 thicker than the thickness of the adhesion layer 14 formed on the bottom portion 13b of the adhesion layer 14 on the top portion 13a.

  The dust-proof layer 15 is a layer provided to prevent adhesion of dust and dust, and a material having a low surface energy is used. For example, a fluorine-containing silane coupling agent can be applied. The dust-proof layer 15 is formed on the adhesion layer 14 with a substantially uniform thickness.

  As shown in FIG. 1B, the pitch P between the cones 10 is shorter than the wavelength of the light for preventing reflection, and is about 100 to 500 nm, and the height H is about 100 to 500 nm. Such a fine cone 10 acts optically in the same manner as when the refractive index of the fine cone 10 continuously changes from the surface toward the substrate 11. That is, the change in the refractive index from the surface to the base material 11 is determined by how the base material 11 is mixed with an external medium (usually air) at the height of the fine cone 10. For example, although the refractive index of air is almost near the top portion 13a of the convex portion 12, a continuous refractive index change that gradually approaches the refractive index of the substrate as it goes to the substrate 11 side is shown. As a result, it has a very good antireflection function with little color change due to viewing angle, and also has a dustproof function since the dustproof layer 15 is provided on the surface of the cone 10.

(Antireflection member manufacturing method)
Next, a method for manufacturing the antireflection member will be described. FIG. 2 is a process diagram showing a manufacturing method of the antireflection member. The manufacturing method of an antireflection member provided with a plurality of cones in this embodiment corresponds to an adhesive application step of applying an adhesive that becomes an adhesion layer on a translucent base material, and a surface shape of the cone. A dust-proofing agent coating step for applying a dust-proofing agent serving as a dust-proof layer to the surface of the molded mold, pressurizing the molding die toward the surface on which the adhesion agent has been applied, A cone having an adhesion layer formed thicker than a thickness of the adhesion layer formed on the bottom of the convex portion and a dustproof layer formed on the adhesion layer. And a cone forming step to be formed. This will be specifically described below.

  As shown in FIG. 2 (a), in the adhesion agent coating step, an adhesion agent 14a that becomes the adhesion layer 14 is formed on a transparent substrate 11a, for example, a thermosetting resin, for example, TMA (trimethyl alumina). Is applied about 10 nm.

  On the other hand, in the dust-proofing agent application step, as shown in FIG. 2A, a dust-proofing agent 15a that becomes the dust-proofing layer 15 on the surface of the mold 20 corresponding to the surface shape of the cone 10 such as a fluorine-containing silane coupling agent. Apply.

  Next, as shown in FIG. 2B, in the cone forming step, the base 11 a and the mold 20 are heated, and then the mold 20 is pressurized toward the surface on which the adhesive 14 a is applied. If it does so, adhesive agent 14a will flow to the top 13a side of convex part 12 of substrate 11a formed by pressurization. Thereby, the thickness of the adhesion layer 14 formed on the top portion 13 a of the convex portion 12 is formed to be thicker than the thickness of the adhesion layer 14 formed on the skirt portion 13 b of the convex portion 12. Further, this allows the adhesive 14a to easily flow following the surface shape of the mold 20, so that a cone shape with a triangular cross section with a sharp tip can be formed. Accordingly, the adhesive 14a can be said to be an auxiliary agent that flows in accordance with the surface shape of the mold 20 and assists the formation of a desired cone shape. And after hold | maintaining the shaping | molding die 20 in the pressurized state, the base material 11a and the shaping | molding die 20 are cooled. Thereafter, for example, the fluorine-containing silane coupling agent is hydrolyzed and bonded to TMA in a 60 ° C./90% RH atmosphere for a predetermined period. And hydrolysis is stopped by drying the base material 11a and the shaping | molding die 20 after the predetermined period. Then, as shown in FIG.2 (c), the shaping | molding die 20 is released. At this time, since the adhesion layer 14 and the dustproof layer 15 are in close contact with each other, the dustproof agent 15a initially applied to the mold 20 side is transferred as the dustproof layer 15 to the substrate 11 side. That is, the dust-proof layer 15 having a substantially uniform thickness is formed on the adhesion layer 14.

  In this way, the plurality of cones 10 each having the convex portion 12 formed on the base material 11, the adhesion layer 14 formed on the convex portion 12, and the dustproof layer 15 formed on the adhesion layer 14. The antireflection member 1 comprised by this is formed.

  As a method of forming the dust-proof layer 15 on the surface portion of the cone 10, it is conceivable to use a sputtering method, but in the case of the sputtering method, a film is not formed on the top portion 13a of the convex portion 12, The sputtered film tends to be deposited on the portion 13b. If it does so, the shape of the cone 10 will change (decrease of aspect ratio), and there exists a possibility that an antireflection function may fall. Therefore, as in the present embodiment, the dustproof layer 15 having a uniform thickness can be formed by transferring the dustproof layer 15 when the mold 20 is pressed. Thereby, the shape of the cone 10 can be maintained (the aspect ratio is maintained).

(Configuration of electro-optical device)
Next, the configuration of the electro-optical device will be described. FIG. 3 is a cross-sectional view illustrating a configuration of a liquid crystal display as an electro-optical device. As shown in FIG. 3, the liquid crystal display 100 includes a liquid crystal layer 120, a lower polarizing plate 124 disposed below the liquid crystal layer 120 via a lower glass substrate 122, and an upper portion above the liquid crystal layer 120. And an upper polarizing plate 128 arranged with a glass substrate 126 interposed therebetween. Further, a pixel electrode 130 and a counter electrode 132 are provided between the glass substrates 122 and 126 on both sides of the liquid crystal layer 120 with an alignment film (not shown) interposed therebetween.

  The antireflection member 1 is disposed on the upper polarizing plate 128. In the antireflection member 1, as described above, a plurality of fine cones 10 form a continuous pattern. For this reason, since there is no interface having a significantly different refractive index between the air on the surface of the liquid crystal display 100 and the upper polarizing plate 128, the reflection of light on the surface of the liquid crystal display 100 is suppressed, and the display function is degraded due to the reflection. Is prevented. Furthermore, since the dust-proof layer 15 is formed on the surface of the cone 10 of the antireflection member 1, the adhesion of dust and dust is prevented, and the optical characteristics can be maintained over a long period of time.

(Configuration of electronic equipment)
Next, the configuration of the electronic device will be described. FIG. 4 is a perspective view illustrating a configuration of a mobile phone as an electronic device. As shown in FIG. 4, the mobile phone 200 includes a display unit 201 including the liquid crystal display 100 described above, a plurality of operation buttons 202, an earpiece 203, a mouthpiece 204, and the like. Thereby, it is possible to provide the mobile phone 200 including the display unit 201 that is excellent in reliability and capable of high-quality display.

  Therefore, according to the above embodiment, the following effects can be obtained.

  (1) The dust-proof layer 15 was formed on the top portion 13 a of the convex portion 12 of the base material 11 via the adhesion layer 14. Thereby, adhesiveness with the dust-proof layer 15 becomes strong, peeling with the base material 11 and the dust-proof layer 15 is prevented, and a dust-proof function can be exhibited over a long period of time. Furthermore, even if a finger, an object, or the like touches the tip portion of the cone 10, the occurrence of damage or the like can be prevented by the elasticity of the adhesion layer 14.

  (2) The thickness of the adhesion layer 14 at the top portion 13 a of the convex portion 12 of the substrate 11 is formed thicker than the thickness of the adhesion layer 14 at the hem portion 13 b of the convex portion 12. This makes it possible to easily form the cone 10 having a sharp tip. Then, the dust-proof layer 15 having a uniform thickness is formed on the adhesion layer 14. Thereby, antireflection and a dustproof effect can be acquired, maintaining an optical characteristic.

  DESCRIPTION OF SYMBOLS 1 ... Antireflection member, 10 ... Cone, 11 ... Base material, 11a ... Base material, 12 ... Convex part, 13a ... Top part, 13b ... Bottom part, 14 ... Adhesion layer, 14a ... Adhesive agent, 15 ... Dust-proof layer, 15a ... Dustproofing agent, 20 ... Mold, 100 ... Liquid crystal display as electro-optical device, 200 ... Mobile phone as electronic equipment.

Claims (6)

Convex portions formed on the base material surface having translucency;
An adhesion layer formed on at least the top of the convex part;
An antireflection member comprising a plurality of cones having a dustproof layer formed on the adhesion layer. The antireflection member according to claim 1,
The antireflection member, wherein a thickness of the adhesion layer formed on the top of the convex portion is larger than a thickness of the adhesion layer formed on a skirt portion of the convex portion. The antireflection member according to claim 2,
By pressing a molding die corresponding to the surface shape of the cone against the member having an adhesive agent that becomes the adhesive layer formed on the base material surface, the top of the convex portion An antireflection member, wherein the adhesion layer thicker than a thickness of the adhesion layer formed on a skirt is formed. A method of manufacturing an antireflection member having a plurality of cones,
An adhesive application step of applying an adhesion agent to be an adhesion layer on a substrate having translucency;
A dust-proofing agent applying step of applying a dust-proofing agent to be a dust-proof layer on the surface of the mold corresponding to the surface shape of the cone;
The mold is pressurized toward the surface on which the adhesive is applied, and the thickness of the convex portion formed on the base material and the thickness of the adhesive layer formed on the top of the convex portion is the bottom of the convex portion. A cone forming step of forming the cone having the adhesion layer formed thicker than the adhesion layer formed on the portion and the dustproof layer formed on the adhesion layer. The manufacturing method of the antireflection member characterized by the above-mentioned.   An electro-optical device comprising the antireflection member according to claim 1 or the antireflection member manufactured by the method for manufacturing an antireflection member according to claim 4.   An electronic apparatus equipped with the electro-optical device according to claim 5.

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