WO2023238761A1 - 光学積層体およびその製造方法、ならびに該光学積層体を用いた画像表示装置 - Google Patents

光学積層体およびその製造方法、ならびに該光学積層体を用いた画像表示装置 Download PDF

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WO2023238761A1
WO2023238761A1 PCT/JP2023/020421 JP2023020421W WO2023238761A1 WO 2023238761 A1 WO2023238761 A1 WO 2023238761A1 JP 2023020421 W JP2023020421 W JP 2023020421W WO 2023238761 A1 WO2023238761 A1 WO 2023238761A1
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WIPO (PCT)
Prior art keywords
optical functional
optical
functional layer
layer
functional part
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PCT/JP2023/020421
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English (en)
French (fr)
Japanese (ja)
Inventor
拓也 ▲徳▼岡
雄基 大瀬
美優 小川
宏太 仲井
政和 望月
奈津美 中島
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日東電工株式会社
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Publication of WO2023238761A1 publication Critical patent/WO2023238761A1/ja

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/24—Measuring arrangements characterised by the use of optical techniques for measuring contours or curvatures
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/11—Anti-reflection coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/02—Details
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays

Definitions

  • the present invention relates to an optical laminate, a method for manufacturing the same, and an image display device using the optical laminate.
  • Non-optical functional parts typically include parts where part of the film is missing (e.g., through holes, cutouts), and parts of the film where optical functions are not provided (e.g., where optical functions are not provided by masks, etc.). (areas in which the optical function once imparted to the film has disappeared) (for example, non-polarizing areas formed by decolorizing a polarizer).
  • areas in which the optical function once imparted to the film has disappeared for example, non-polarizing areas formed by decolorizing a polarizer.
  • the present invention has been made to solve the above-mentioned conventional problems, and its main purpose is to include two or more optically functional layers each having a non-optical functional part, and to precisely align the non-optical functional parts. It is an object of the present invention to provide an optical laminate which is made of aluminum and in which adhesive stains are suppressed, and a simple method for producing the same.
  • optical laminates [1] to [9], the methods for manufacturing optical laminates [10] to [15], or the image display device [16] are provided. be done.
  • the optical functional layer has a first non-optical functional part
  • the second optical functional layer has a second non-optical functional part
  • the first non-optical functional part and the second non-optical functional part the first non-optically functional part and the second non-optically functional part have similar shapes in plan view, and the centers of the first non-optically functional part and the second non-optically functional part are aligned
  • the first non-optically functional part and the second non-optically functional part An optical laminate, wherein each of the second non-optically functional parts is formed as a part of a film constituting the first optically functional layer and the second optically functional layer.
  • the transmittance of the second optically functional layer is lower than the transmittance of the first optically functional layer, and the transmittance of the second optically functional layer is equal to the transmittance of the first optically functional layer.
  • the optical laminate according to [5], wherein the difference between the diameter of the first non-optical functional part and the diameter of the second non-optical functional part is 1.5 mm or less.
  • the size of the second optical functional layer is larger than the size of the first optical functional layer, and the entire first optical functional layer is disposed within the second optical functional layer when viewed from above.
  • the difference between the size of the first optically functional layer and the second optically functional layer is equal to the diameter of the first non-optically functional part and the diameter of the second non-optically functional part.
  • Detection of the first non-optical functional part and detection of the second non-optical functional part are carried out using ring-shaped illumination means.
  • the manufacturing method according to [10] which comprises irradiating the area.
  • the ring-shaped illumination means has LEDs arranged in a ring-shaped frame having a predetermined width, and the frame is configured to be inclined radially outward.
  • Method [13] The manufacturing method according to [11] or [12], wherein the ring-shaped illumination means emits red light.
  • the irradiation by the ring-shaped illumination means is performed with a surface protection film temporarily attached to the film constituting the first optical functional layer, according to any one of [11] to [13].
  • Production method [15]
  • the first non-optical functional part and the second non-optical functional part are circular in plan view, and the diameter of the first non-optical functional part is larger than the diameter of the second non-optical functional part. , [10] to [14].
  • It includes the optical laminate according to any one of [1] to [9], and has a camera section, and the first non-optical functional section and the second non-optical functional section are connected to the camera section.
  • An image display device placed at a position corresponding to.
  • an optical laminate includes two or more optical functional layers each having a non-optical functional part, the non-optical functional parts are precisely aligned, and adhesive staining is suppressed; And a simple manufacturing method thereof can be realized.
  • FIG. 1 is a schematic plan view of an optical laminate according to one embodiment of the present invention.
  • 2 is a schematic cross-sectional view taken along line II-II of the optical laminate in FIG. 1.
  • FIG. (a) to (d) are schematic diagrams illustrating a method for manufacturing an optical laminate according to one embodiment of the present invention.
  • FIG. 1 is a schematic plan view of an optical laminate according to one embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional view of the optical laminate of FIG. 1 along line II-II.
  • the optical laminate is typically rectangular in plan view, and has a pair of opposing long sides and a pair of opposing short sides.
  • the illustrated optical laminate 100 includes a first optical functional layer 10 and a second optical functional layer 20.
  • the first optical functional layer 10 includes an optical functional layer main body (hereinafter sometimes simply referred to as a first optical functional layer) 11 and an adhesive layer 13.
  • the first optical functional layer 10 may have a base material (not shown) between the optical functional layer main body 11 and the adhesive layer 13.
  • the substrate is used to form the optical functional layer body and may be introduced into the optical laminate as a substrate/optical functional layer body laminate.
  • the optical functional layer main body is typically formed directly on the base material. In this specification, "directly" means that there is no intervening adhesive layer.
  • the first optical functional layer 10 and the second optical functional layer 20 are laminated with an adhesive layer 13 in between.
  • the first optical functional layer 10 has a first non-optical functional section 12 .
  • the second optical functional layer 20 has a second non-optical functional section 22 .
  • the first non-optical functional section 12 and the second non-optical functional section 22 have similar shapes in plan view, and the centers of the first non-optical functional section 12 and the second non-optical functional section 22 are aligned. has been done.
  • the first non-optical functional section 12 and the second non-optical functional section 22 may typically be provided at a position corresponding to a camera section of an image display device to which the optical laminate is applied.
  • the optical laminate may further include another optical functional layer (not shown) depending on the purpose.
  • Another optically functional layer may have a non-optically functional part at a position corresponding to the first non-optically functional part and the second non-optically functional part.
  • the size of the second optical functional layer is larger than the size of the first optical functional layer means that both the long side and the short side of the second optical functional layer are larger than the first optical functional layer. means larger (longer) than the long and short sides of the optical functional layer.
  • the diameter of the first non-optical function section 12 is larger than the diameter of the second non-optical function section 22, and when viewed from above, the entire second non-optical function section 22 has the first non-optical function. It is arranged within the section 12.
  • Such a configuration has the advantage that the boundary between the first non-optical functional section and the second non-optical functional section is inconspicuous. In particular, the outline of the first non-optical functional section can be made less noticeable.
  • the difference between the size (diameter in the illustrated example) of the first non-optical functional part 12 and the size (diameter in the illustrated example) of the second non-optical functional part 22 is preferably 1.5 mm or less, and more preferably It is 1.2 mm or less, more preferably 1.0 mm or less.
  • the lower limit of the size difference may be, for example, 0.1 mm.
  • the difference in size is a difference in the major axis or minor axis; the shape in plan view is a quadrilateral.
  • the difference in size is as described above regarding the difference in size between the first optical functional layer and the second optical functional layer; in the case where the planar view shape is a polygon other than a quadrangle, the difference in size is the difference in the diameters of the inscribed circles.
  • the transmittance of the first optically functional layer 10 is typically lower than the transmittance of the first non-optically functional section 12; the transmittance of the second optically functional layer 20 is typically lower than that of the second non-optically functional section 12 It is lower than the transmittance of the optical function section 22. Furthermore, in one embodiment, the transmittance of the second optically functional layer is lower than the transmittance of the first optically functional layer.
  • the difference between the transmittance of the second optical functional layer and the transmittance of the first optical functional layer is preferably 35% or more, more preferably 40% or more, and still more preferably 45% or more. If the difference is within such a range, the above effects can become more significant.
  • the upper limit of the difference may be, for example, 50%.
  • the difference between the size of the first optically functional layer and the size of the second optically functional layer is the size (diameter in the illustrated example) of the first non-optically functional part and the size of the second non-optically functional layer. This is larger than the difference between the diameter of the functional part (diameter in the illustrated example).
  • the first non-optically functional portion 12 is formed as a part of the film that constitutes the first optically functional layer 10; It is formed as part of the film that constitutes layer 20.
  • the first non-optical functional part 12 and the second non-optical functional part 22 are not defined by a part of the film being missing (for example, a through hole, a notch).
  • the optical laminate can be suitably used for an image display device with a narrower bezel portion (preferably bezel-less), an image display device with a smaller step difference in the display portion (preferably full-flat design), etc. . Furthermore, with such a configuration, it is possible to reduce adhesive extrusion, air bubbles during bonding, and inclusion of foreign substances.
  • the first non-optically functional part 12 may be a thin part that is thinner than other parts of the film constituting the first optically functional layer 10.
  • the first non-optically functional part is typically a thin part with a recessed part formed on one side (preferably, the side opposite to the second optically functional layer).
  • the step difference (depth of the recess) between the first non-optical functional part and the other parts may be, for example, 1.5 ⁇ m to 3.5 ⁇ m.
  • the first optical functional layer 10 is an anti-glare layer, an antireflection layer, or a laminate thereof, and the second optical functional layer 20 is a polarizing plate.
  • the first non-optically functional part 12 is typically a part that has not been subjected to a process to impart an optical function (in this embodiment, anti-glare process or anti-reflection process) using a mask or the like;
  • the second non-optical functional portion 22 is typically a portion where the optical function once imparted has disappeared (in this embodiment, a non-polarizing portion formed by bleaching the polarizer).
  • the polarizing plate may be a polarizing plate with a retardation layer (for example, an antireflection circularly polarizing plate) provided with any appropriate retardation layer depending on the purpose. Note that since the polarizer protective film and the retardation layer in the polarizing plate with a retardation layer are typically transparent, there is no need to form a non-optical functional part.
  • a retardation layer for example, an antireflection circularly polarizing plate
  • a method for manufacturing an optical laminate according to an embodiment of the present invention includes detecting a first non-optically functional part in a film constituting a first optically functional layer, and detecting a first non-optically functional part in a film constituting a first optically functional layer. detecting a second non-optically functional part in the film; aligning the center of the first non-optically functional part with the center of the second non-optically functional part; and detecting the second non-optically functional part in the film; Adjusting the long side or short side of the film constituting the film to be parallel to the long side or short side of the film constituting the second optical functional layer, and the film constituting the first optical functional layer.
  • the first non-optically functional part 12 is formed as a part of the film constituting the first optically functional layer 10; the second non-optically functional part 22 is formed as a part of the film that constitutes the first optically functional layer 10; It is formed as a part of the film that constitutes 20.
  • the size of the film constituting the second optical functional layer is larger than the size of the film constituting the first optical functional layer.
  • the non-anti-glare portion is typically a portion where anti-glare treatment is not performed using a mask or the like.
  • a second non-optical functional part (non-polarizing part) is formed in the polarizer of the polarizing plate.
  • the non-polarized portion is typically a portion formed by bleaching the polarizer. Since any suitable configuration can be adopted as the anti-glare layer and the polarizing plate, detailed explanation will be omitted.
  • the shapes and sizes of the anti-glare film and the polarizing plate, as well as the shapes and sizes of the first non-optical functional part (non-anti-glare part) and the second non-optical functional part (non-polarizing part), are as explained in Section A above. It is.
  • the detection typically includes illuminating the non-antiglare and non-polarized areas using a ring-shaped illumination means.
  • the anti-glare film 10 will be explained as an example. As shown in FIG. 3(a), a laminate in which a surface protection film 40 is temporarily attached to the surface of the anti-glare layer of the anti-glare film 10 and a release liner 50 is temporarily attached to the surface of the adhesive layer is placed on a detection stage or Fix by suction.
  • the detection stage may have adhesive properties, or may be an endless belt with adhesive properties. In this case, the laminate can be fixed to the detection stage by the adhesiveness of the detection stage.
  • placing such mounting, suction fixation, and adhesive fixation may be collectively referred to as "placing, etc.”
  • the end (at least one side) of the laminate is detected in advance by a detection means (not shown), and the laminate is aligned and then placed on a detection stage.
  • the non-anti-glare portion 22 of the placed stacked body is illuminated using a ring-shaped illumination means 60 arranged above in the illustrated example, and the reflected light is transmitted to a detection means (typically, an imaging device) 70.
  • a detection means typically, an imaging device
  • the detailed steps of detection are as follows: (i) Setting an area within the field of view of the detection means to detect the boundary between brightness and darkness (contrast) by the irradiation means; (ii) Setting the number of detection points and starting the detection.
  • the contour shape of a circle is determined by the least squares method from the edge information of the large number of points; (iii) an approximate circle is formed for the contour of the circle, and the center position and diameter (or radius) of the circle are determined.
  • the individual LEDs are arranged so as to be inclined radially inward (in the example shown, downward).
  • the irradiation light can be concentrated on the non-antiglare portion, and as a result, measurement variations can be reduced.
  • the color of the light emitted from the ring-shaped illumination means can be, for example, red, blue or white, preferably red. Although it is not theoretically clear, measurement variations can be reduced by irradiating with red light.
  • irradiation by the illumination means is typically performed through a surface protection film 40. Note that the ring-shaped illumination means 60 may be arranged below.
  • Detection of the non-polarized portion 22 of the polarizing plate 20 is substantially the same as described above, except that when the polarizing plate has an adhesive layer, irradiation with the illumination means is performed after peeling off the surface protection film on the side opposite to the adhesive layer. can be performed using a similar procedure.
  • polarizing plates are usually provided with an adhesive layer for bonding them to the panel, but if such an adhesive layer is not provided, a surface protection film may be temporarily attached instead of a release liner.
  • the center C1 of the non-antiglare part 12 and the center C2 of the non-polarizing part 22 are aligned. More specifically, while the anti-glare film 10 and the polarizing plate 20 are suction-fixed to separate suction plates, the suction plates are relatively moved in parallel. Instead of a suction plate, an adhesive support may be used. Hereinafter, the suction plate and the adhesive support may be collectively referred to as "suction plate, etc.”.
  • the anti-glare film 10 is moved in parallel in the horizontal direction of the drawing, and the polarizing plate 20 is moved in parallel in the vertical direction of the drawing, but it is also possible to move only the anti-glare film 10, or only the polarizing plate 20 is moved. You may let them.
  • Any suitable means for example, an XY plotter
  • the center alignment is performed on the XY coordinates of C1 and C2 using any appropriate control means based on the center position information (for example, the position on the XY coordinates) obtained in the detection step of B-2 above.
  • the positions of the non-antiglare section 12 and the non-polarizing section 22 may be adjusted based on visual means (for example, a camera); or a combination of these may be used. Note that although the parallel movement distance is drawn large in FIG. 3B for ease of viewing, the actual alignment of the center of the non-optical functional section is a fine adjustment of the position.
  • the edges of the film are aligned. Specifically, as shown in FIG. 3C, adjustment is made so that the long side or short side of the anti-glare film 10 and the long side or short side of the polarizing plate 20 are parallel to each other. More specifically, with the center C1 of the non-antiglare section 12 and the center C2 of the non-polarizing section 22 aligned, the respective suction plates and the like are relatively rotated within the plane. In the illustrated example, the polarizing plate 20 is rotated, but the anti-glare film 10 may also be rotated, or both may be rotated. Which optical film is to be rotated is determined depending on the degree of deviation of the film from a predetermined position.
  • the entire anti-glare film is arranged within the polarizing plate, the non-anti-glare part 12 and the non-polarizing part 22 are arranged concentrically, and the entire non-polarizing part is a non-anti-glare film.
  • An optical laminate placed within the unit can be fabricated. In the optical laminate thus obtained, the ends of the anti-glare film 10 and the polarizing plate 20 are aligned while the non-anti-glare portion 12 and the non-polarizing portion 22 are aligned. Precise alignment with the polarizing section 22 is maintained.
  • An image display device can be suitably applied to an image display device. Therefore, an image display device including such an optical laminate is also included in the embodiments of the present invention.
  • An image display device typically includes a camera section. In the image display device, the optical laminate is arranged such that the first non-optical functional section and the second non-optical functional section are located at positions corresponding to the camera section. Examples of the image display device include a liquid crystal display device, an organic electroluminescence (EL) display device, and a quantum dot display device.
  • EL organic electroluminescence

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Theoretical Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)
  • Adhesive Tapes (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)
  • Optical Elements Other Than Lenses (AREA)
  • Electroluminescent Light Sources (AREA)
PCT/JP2023/020421 2022-06-10 2023-06-01 光学積層体およびその製造方法、ならびに該光学積層体を用いた画像表示装置 WO2023238761A1 (ja)

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Citations (8)

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Publication number Priority date Publication date Assignee Title
JPH0989540A (ja) * 1995-09-25 1997-04-04 Rozefu Technol:Kk 透明円形体の外観検査方法
JP2007132857A (ja) * 2005-11-11 2007-05-31 Seiko Epson Corp 画像処理装置、画像処理方法、描画装置、電気光学装置の製造方法、電気光学装置、電子機器
JP2012126127A (ja) * 2010-11-22 2012-07-05 Nitto Denko Corp 光学フィルム積層体の製造方法及び製造システム、並びに、光学フィルム積層体
JP2017151162A (ja) * 2016-02-22 2017-08-31 住友化学株式会社 偏光板及び画像表示装置
CN109194787A (zh) * 2018-09-20 2019-01-11 厦门三德信电子科技有限公司 一种用于前置摄像头的显示模组结构及其贴合工艺
CN209728594U (zh) * 2019-05-31 2019-12-03 维沃移动通信有限公司 显示模组及终端设备
JP2021128333A (ja) * 2020-02-14 2021-09-02 日東電工株式会社 粘着剤層付光学積層体および画像表示装置、ならびに、それらの製造方法
JP2021139982A (ja) * 2020-03-03 2021-09-16 日東電工株式会社 防眩フィルム

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0989540A (ja) * 1995-09-25 1997-04-04 Rozefu Technol:Kk 透明円形体の外観検査方法
JP2007132857A (ja) * 2005-11-11 2007-05-31 Seiko Epson Corp 画像処理装置、画像処理方法、描画装置、電気光学装置の製造方法、電気光学装置、電子機器
JP2012126127A (ja) * 2010-11-22 2012-07-05 Nitto Denko Corp 光学フィルム積層体の製造方法及び製造システム、並びに、光学フィルム積層体
JP2017151162A (ja) * 2016-02-22 2017-08-31 住友化学株式会社 偏光板及び画像表示装置
CN109194787A (zh) * 2018-09-20 2019-01-11 厦门三德信电子科技有限公司 一种用于前置摄像头的显示模组结构及其贴合工艺
CN209728594U (zh) * 2019-05-31 2019-12-03 维沃移动通信有限公司 显示模组及终端设备
JP2021128333A (ja) * 2020-02-14 2021-09-02 日東電工株式会社 粘着剤層付光学積層体および画像表示装置、ならびに、それらの製造方法
JP2021139982A (ja) * 2020-03-03 2021-09-16 日東電工株式会社 防眩フィルム

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