WO2007063751A1 - 表示装置の製造方法、及び貼り合わせ方法 - Google Patents

表示装置の製造方法、及び貼り合わせ方法 Download PDF

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Publication number
WO2007063751A1
WO2007063751A1 PCT/JP2006/323268 JP2006323268W WO2007063751A1 WO 2007063751 A1 WO2007063751 A1 WO 2007063751A1 JP 2006323268 W JP2006323268 W JP 2006323268W WO 2007063751 A1 WO2007063751 A1 WO 2007063751A1
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WO
WIPO (PCT)
Prior art keywords
adhesive
liquid
liquid adhesive
curing
transparent
Prior art date
Application number
PCT/JP2006/323268
Other languages
English (en)
French (fr)
Inventor
Tsutomu Matsuhira
Original Assignee
Seiko Instruments Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38092086&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2007063751(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Seiko Instruments Inc. filed Critical Seiko Instruments Inc.
Priority to EP06823495A priority Critical patent/EP1973089B1/en
Priority to KR1020087012673A priority patent/KR101168469B1/ko
Priority to DE602006019317T priority patent/DE602006019317D1/de
Priority to US12/085,807 priority patent/US20090283211A1/en
Priority to CN2006800447485A priority patent/CN101317205B/zh
Priority to JP2007547905A priority patent/JPWO2007063751A1/ja
Publication of WO2007063751A1 publication Critical patent/WO2007063751A1/ja

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • 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
    • C09J5/00—Adhesive processes in general; Adhesive processes not provided for elsewhere, e.g. relating to primers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1435—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface at least passing through one of the parts to be joined, i.e. transmission welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1429—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface
    • B29C65/1448—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the way of heating the interface radiating the edges of the parts to be joined, e.g. for curing a layer of adhesive placed between two flat parts to be joined, e.g. for making CDs or DVDs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1477—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier
    • B29C65/1483—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation making use of an absorber or impact modifier coated on the article
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/4805—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the type of adhesives
    • B29C65/483—Reactive adhesives, e.g. chemically curing adhesives
    • B29C65/4845—Radiation curing adhesives, e.g. UV light curing adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
    • B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/342—Preventing air-inclusions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/45—Joining of substantially the whole surface of the articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/733—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence
    • B29C66/7336—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light
    • B29C66/73365—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light
    • B29C66/73366—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the optical properties of the material of the parts to be joined, e.g. fluorescence, phosphorescence at least one of the parts to be joined being opaque, transparent or translucent to visible light at least one of the parts to be joined being transparent or translucent to visible light both parts to be joined being transparent or translucent to visible light
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9161—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux
    • B29C66/91641—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time
    • B29C66/91643—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile
    • B29C66/91645—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the heat or the thermal flux, i.e. the heat flux the heat or the thermal flux being non-constant over time following a heat-time profile by steps
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/0007—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality
    • B32B37/003—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding involving treatment or provisions in order to avoid deformation or air inclusion, e.g. to improve surface quality to avoid air inclusion
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1406—Ultraviolet [UV] radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/14—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation
    • B29C65/1403—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using wave energy, i.e. electromagnetic radiation, or particle radiation characterised by the type of electromagnetic or particle radiation
    • B29C65/1409—Visible light radiation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7802—Positioning the parts to be joined, e.g. aligning, indexing or centring
    • B29C65/782—Positioning the parts to be joined, e.g. aligning, indexing or centring by setting the gap between the parts to be joined
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
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    • B29C66/21—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being formed by a single dot or dash or by several dots or dashes, i.e. spot joining or spot welding
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B32B2457/206—Organic displays, e.g. OLED
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/12—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by using adhesives
    • B32B37/1284—Application of adhesive
    • B32B37/1292—Application of adhesive selectively, e.g. in stripes, in patterns
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/133308—Support structures for LCD panels, e.g. frames or bezels
    • G02F1/133311—Environmental protection, e.g. against dust or humidity
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2202/00—Materials and properties
    • G02F2202/28—Adhesive materials or arrangements

Definitions

  • the present invention relates to a method of bonding a transparent substrate and a substrate with a liquid adhesive.
  • a transparent cover plate of a device such as a mobile phone and a flat display such as a liquid crystal display device, a plasma display, an organic EL, an inorganic EL, or an FED, or a bonding of a touch panel and a flat display.
  • a transparent touch panel As a method of disposing a transparent touch panel on a display panel, it is known that the transparent touch panel is adhesively fixed to the outer periphery of the display panel with a double-sided adhesive having a thickness of 0.3 to 0.5 to 1 mm or more. Alternatively, a method is known in which the display panel and the touch panel are bonded together with an optical adhesive (see, for example, Japanese Patent Laid-Open No. 09-274536, hereinafter referred to as Patent Document 1).
  • the transparent cover plate and the liquid crystal panel on the display screen of the mobile phone are placed on the outer periphery of the display area of the liquid crystal panel and the opaque area formed of printed matter outside the display area of the transparent cover plate.
  • An elastic body such as 0.5 rubber was placed between them.
  • the transparent cover plate transparent plastic such as acrylic or polycarbonate, glass or the like is used.
  • a low-reflective film that is formed by laminating materials with a refractive index stepwise, an electromagnetic shield with a grid-like etching pattern such as copper or aluminum, and a hard to prevent scratches A coating is often provided.
  • a film sheet for preventing cracking is attached to the surface, or an anti-glare-treated film sheet for preventing regular reflection is attached.
  • the shape of the transparent cover plate and the display element is almost square. Touch panels include analog resistance film method, digital resistance film method, capacitance, and ultrasonic method. Disclosure of the invention
  • the gap between the outer periphery of the flat display and the transparent cover plate is difficult to reduce to 0.1 mm or less due to the impact resistance and the generation of Yuton rings due to the reduction in thickness.
  • the touch panel, transparent cover plate, and flat display were attached to the entire surface with an optical adhesive sheet, air bubbles were mixed.
  • the size of the bubble in question is a bubble that can be seen with the naked eye, and bubbles of about 100 m or more are problematic.
  • the thicker and more rigid the touch panel and the transparent cover plate the harder it was to stick without bubbles with the laminate method.
  • the optical adhesive sheet when the display power transparent cover plate itself was warped, a peeling phenomenon occurred and bubbles were generated depending on the reliability test conditions and usage environment.
  • the method for manufacturing a display device of the present invention is a method for manufacturing a display device in which a polygonal transparent body and a display element are bonded with a transparent adhesive. Applying a certain amount of liquid adhesive on the bonding surface of the element to a plurality of locations in a spot shape, Applying the adhesive in a linear manner to tie a plurality of liquid adhesives applied, inverting the transparent body or display element applied with the liquid adhesive, and dripping the liquid adhesive applied in a dotted manner A step of contacting the liquid adhesive so as not to impact the liquid dripping on the adherend, a step of filling the liquid adhesive, and a step of curing the liquid adhesive. did.
  • a UV curable adhesive or a visible light curable adhesive was used as the liquid adhesive, and the curing shrinkage of the adhesive was set to 1 to 6%.
  • the transparent body include touch panels, plastic plates, and glass plates.
  • a photo-curing adhesive such as UV or visible light as the liquid adhesive
  • the first curing means for irradiating the adhesive with light through the transparent body and the transparent body The liquid adhesive was cured by two curing means, the second curing means that irradiates light directly from the side direction.
  • the bonding method of the present invention is a bonding method in which a polygonal transparent plate and a plate-shaped adherend are bonded with a transparent adhesive, and a liquid is applied to the bonding surface of the bonding surface of the transparent plate.
  • a step of curing the liquid adhesive is a photo-curing adhesive such as UV or visible light.
  • the first curing means for irradiating the adhesive with light through the transparent body and the lateral direction of the transparent body The liquid adhesive was cured by two curing means of the second curing means that irradiates light more directly.
  • FIG. 1 is a top view of a transparent substrate.
  • FIG. 2 is a top view of the transparent substrate according to the present invention in a state where an adhesive is applied by spot coating.
  • FIG. 3 is a top view showing a state in which the adhesive of the transparent substrate according to the present invention is attached to a line.
  • FIG. 4 is a side view showing a state in which a transparent substrate and a flat display according to the present invention are aligned.
  • FIG. 5 is a side view showing dripping of the adhesive according to the present invention.
  • FIG. 6 is a side view showing a state where the adhesive according to the present invention is in contact with a flat display.
  • FIG. 7 is a top view showing a state where the adhesive according to the present invention is in contact with the flat display.
  • FIG. 8 is a top view showing a state in which the adhesive according to the present invention is wetted with the applied shape of the adhesive on the flat display.
  • FIG. 9 is a top view showing the initial filling state of the adhesive according to the present invention.
  • FIG. 10 is a top view showing a state of filling of the adhesive according to the present invention in the middle stage.
  • FIG. 11 is a top view showing the final state of filling of the adhesive according to the present invention.
  • FIG. 12 is a side view showing a state in which the bonding according to the present invention is completed.
  • FIG. 13 is a schematic view showing the application shape of another adhesive according to the present invention.
  • FIG. 14 is a schematic view showing the application shape of another adhesive according to the present invention.
  • FIG. 15 is a diagram showing the diameters of bubbles included in the adhesive according to the present invention before and after curing.
  • FIG. 16 is a top view showing a state in which a contact agent is applied to a transparent plate according to a conventional method.
  • FIG. 17 is a top view showing a state where an adhesive between a transparent plate and a flat display according to a conventional method is filled.
  • FIG. 18 is a top view showing a state in which an adhesive is applied to another transparent plate according to a conventional method.
  • FIG. 19 is a top view showing an initial state of filling another transparent plate and a flat display according to the conventional method.
  • FIG. 20 is a top view showing an intermediate state of filling with another transparent plate and a flat display according to the conventional method.
  • the present invention provides a method for adhering a polygonal transparent plate and a plate-like body with a transparent adhesive, wherein the liquid adhesive is attached to the transparent plate or the adhesive surface of the plate-like body at least at a plurality of locations.
  • a certain amount of coating a step of applying an adhesive that joins the plurality of applied adhesives in a line, or an amount of adhesive applied by a line at a position where the continuous line overlaps the line. Apply the adhesive to the adherend that forms a dripping in the adhesive, the process of applying a large amount of adhesive in one or more spots, the transparent plate coated with the adhesive, or the process of inverting the plate.
  • the step of contacting and further filling the adhesive and the step of irradiating light from the transparent plate side and curing the adhesive were performed.
  • the adhesive was applied linearly between the applied adhesive and the center, thereby eliminating air bubbles caused by air entrainment during filling.
  • the adhesive may be applied in a single stroke by repeating a process of applying a certain amount, applying a linear shape, applying a constant amount, and further applying a linear shape. In the case of one-stroke writing, the portion applied in a linear form may be written twice. After the adhesive is applied, the substrate on which the adhesive is applied is turned over to form a liquid sag, and the liquid sag slowly contacts the opposite substrate. You can increase the descent speed of the substrate to which the adhesive is applied when the dripping of the adhesive applied to the corner and the center comes into contact.
  • the transparent touch panel and the transparent cover plate can similarly be bonded to the flat display without bubbles and with a uniform adhesive layer.
  • the adhesive is a UV curable adhesive or a visible light curable adhesive.
  • a suitable method for bonding a rectangular transparent cover plate or touch panel to a flat display is as follows.
  • a suitable viscosity of the adhesive is 3000 to 2000 cP.
  • the coating amount is 0.0135 g / cm 2 ⁇ 10% in terms of the adhesion area.
  • the coating amount at one point is an amount obtained by dividing the amount of 50 to 80% of the total coating amount almost evenly. Apply a line so that the adhesive is applied to the corners of the corner with the remaining adhesive. Apply at this time so that bubbles do not enter.
  • Invert the transparent cover plate that has been applied, and form a dripping in the spot-applied adhesive Match the position of the flat display with the front and back and the horizontal direction, and contact the flat display and the liquid dripping at a speed of about 20 mZsec without impact. Furthermore, the distance between the flat display and the transparent cover plate is reduced at approximately the same speed.
  • the adhesive gets wet between the flat display and the transparent cover panel in the area of the coated adhesive, make sure that the transparent cover plate is not displaced from front to back and left and right, and is filled with its own weight. Leave for about 30 to 120 seconds to fill the entire surface.
  • UV for curing the adhesive is irradiated simultaneously from the front and side of the transparent cover plate, and the attachment is completed.
  • the adhesive is UV curable and has a cure shrinkage of about 2%.
  • Figure 1 shows a transparent plate 1 placed on the entire surface of a flat display, and the material is acrylic.
  • the thickness is 1.5mm.
  • the size is 40 x 40mm.
  • the external dimensions of the display are 45 x 32mm and the thickness is 1.3mm.
  • the area of the display screen is 36 x 28.5 mm.
  • the display is printed in black with a frame shape in the area larger than the area of the LCD 3 display screen.
  • the printed material is formed on the display side surface.
  • a metal film may be formed by a method such as sputtering, and a printed material may be laminated.
  • Adhesive 2 is adhesive Apply approximately 0.01318 gZcm2 to the area. In this case, apply 0.1687g in total.
  • the amount of spot-coated adhesive 2 is about 0.028 g per point.
  • This adhesive is an ultraviolet curable adhesive, and after curing, the elastic modulus is 1.6 ⁇ 10 6 Pa and the refractive index is 1.52. Further, as shown in FIG. 3, the adhesive 2 applied to each corner and the adhesive 2 applied to the center are applied linearly.
  • the adhesive applied in a linear form may be applied to the outer peripheral side of the adhesive applied by spot application in addition to the application between the adhesives applied by spot application.
  • the transparent plate 1 to which the adhesive 2 is applied is reversed, and the height of the transparent plate 1 that does not contact the adhesive 2 is maintained and aligned with the display 3.
  • a liquid crystal is sealed between a glass substrate 4 on which a TFT array is formed and a glass substrate 5 on which a color filter is formed.
  • a polarizing plate 6 on the display surface side and a polarizing plate 7 on the back surface side are arranged on the front surface.
  • the driver IC6 that drives the display and the interface FPC that connects to the controller are installed.
  • dripping occurs in the spot-coated adhesive 2.
  • the transparent plate 1 is lowered at a speed of about 20 mZsec, and the adhesive 2 comes into contact with the surface of the display 3 in the form of dots as shown in FIG.
  • the lowering speed is better. If the descending speed is high, the impact of the adhesive coming into contact with the surface of the display causes ripples on the surface of the adhesive 2 and the transparent plate descends further, which may lead to the inclusion of multiple bubbles.
  • the spot-applied adhesive 2 comes into contact with the display 3 and begins to get wet.
  • Fig. 7 shows the state of the transparent plate viewed from above.
  • the display and wet adhesive 10 become dotted.
  • the adhesive is wetted as shown in Fig. 8 in the shape of the applied coating. If the transparent plate 1 is made free before it gets wet to the applied shape, bubbles may be mixed in.
  • the transparent plate 1 is brought into a free state, and the adhesive is filled with its own weight.
  • the adhesive is filled with an adhesive 10 as shown in FIGS.
  • the filling time is about 60 seconds. It can be filled without bubbles or air confinement. When pressure is applied, unevenness in the filling of the adhesive occurs, and if the thickness of the adhesive layer is not uniform, the gap of the liquid crystal is affected and display unevenness may occur.
  • FIG. 12 filling between the transparent plate 1 and the display 3 is completed, and the adhesive is completed by irradiating the adhesive with 2000 mJ of ultraviolet rays and curing.
  • Figure 3 shows the shape of adhesive 2 applied to transparent plate 1.
  • the adhesive for point application may have more centers than corners, or conversely fewer centers.
  • Adhesive 2 is an ultraviolet and visible light curable type and has a cure shrinkage of 1 to 6%, thereby curing bubbles of about 100 m or less before curing contained in the adhesive. Can disappear. If bubbles of approximately 100 ⁇ m or more do not occur during bonding, bonding without bubbles is possible.
  • Figure 15 shows the bubble size of the adhesive with a cure shrinkage of 4%.
  • the transparent substrate may be a touch panel such as an analog method, a capacitance method, or an ultrasonic wave.
  • a touch panel such as an analog method, a capacitance method, or an ultrasonic wave.
  • sapphire glass, alkali glass, soda glass, and its tempered glass, PMMA, PC, etc., or a laminate thereof may be used.
  • the flat display may be not only a TFT liquid crystal system but also a flat display such as STN liquid crystal, other liquid crystal displays, organic EL, inorganic EL, and plasma displays.
  • the adhesive can be not only UV curable but also visible light curable or UV / visible curable!
  • the above-described bonding method solved the occurrence of peeling over time due to air bubbles and warpage of the adherend. Moreover, there was no mixing of bubbles, and a uniform adhesive layer could be obtained. As a result, the distance between the transparent cover panel and the flat panel display can be reduced to approximately 200-30 ⁇ m.

Abstract

　透明板やタッチパネルとフラットディスプレイとを接着する場合、気泡が入らないように貼り付ける方法を提供する。接着面に液体接着剤を各コーナー付近と中心部に点状に一定量塗布し、点状に塗布された接着剤を線状に結ぶように接着剤を塗布する。この接着面を反転して接着剤に液だれを形成させ、対向する被着体にこの液だれを接触させて接着剤を充填させ、透明板側から光を照射して接着剤を硬化させる。すなわち、点接触で接着剤を接触させた後に、接着剤気泡の入り込まない形状に接着剤を流動した後に、接着剤を充填する。                                                                               

Description

表示装置の製造方法、及び貼り合わせ方法
技術分野
[0001] 本発明は、透明基板と基板を液状接着剤で全面接着する方法に関する。例えば、 携帯電話等の機器の透明カバープレートと、液晶表示装置、プラズマディスプレイ、 有機 EL、無機 EL、または FEDなどのフラットディスプレイとの貼り合せ、あるいは、タ ツチパネルとフラットディスプレイとの貼り合せに関する。
背景技術
[0002] 表示パネルの上に透明タツチパネルを配置する方法として、表示パネルの外周に 0 . 3〜0.5〜lmm以上の厚みの両面粘着剤で透明タツチパネルを粘着固定すること が知られている。あるいは、表示パネルとタツチパネルを光学接着剤で全面貼り付け する方法が知られている（例えば、特開平 09— 274536号公報を参照、以下特許文 献 1と称す)。
[0003] また、携帯電話の表示画面上の透明カバープレートと液晶パネルは、液晶パネル の表示領域の外周と透明カバープレートの表示領域外に印刷物などで形成された 不透明領域に、 0. 3〜0. 5ラバーなどの弾性体を間に挟み配置した。
[0004] 特に、携帯電話では、透明カバープレートと表示パネルとの間のスペースを 0. 2m m以下にすると 、う薄型化のニーズが増えて 、る。
[0005] 透明カバープレートには、アクリルやポリカーボネートなどの透明プラスチックや、ガ ラスなどが用いられる。透明カバープレートの表面には、屈折率を段階的に変化した 素材を積層形成した低反射膜、銅やアルミなどカゝらなる格子状のエッチングパターン を持つ電磁シールド、傷を防止するための硬質コーティングが設けられることが多 ヽ 。さらに、ガラスの場合は、割れ防止のためのフィルムシートを表面に貼り付けたり、 正反射を防止するためのアンチグレア処理したフィルムシート等を貼り付けたりしたも のがある。透明カバープレートや表示素子の形状は殆どが四角形である。また、タツ チパネルにはアナログ抵抗膜方式、デジタル抵抗膜方式や静電容量、超音波方式 などがある。 発明の開示
[0006] フラットディスプレイの外周と透明カバープレートとの隙間は、耐衝撃性や薄型化に よる-ユートンリングの発生などのため、 0. 1mm以下の薄型化が困難であった。タツ チパネルや透明カバープレートとフラットディスプレイを光学接着シートで全面貼り付 けする場合、気泡の混入があった。問題となる気泡の大きさは目視で見える気泡であ り、約 100 m以上の気泡を問題としている。特にタツチパネルや透明カバープレー トは厚く剛体であるほどラミネート法では気泡無く貼り付けるのが難し力つた。また、光 学接着シートでは、ディスプレイ力透明カバープレートそのものに反りがあった場合、 信頼性試験条件や使用環境によっては、剥離現象が生じ気泡が発生した。
[0007] 特に、駆動 ICを直接がガラス基板に異方性導電膜で実装するチップオングラス方 式では、実装時の熱により ICとガラスとの間で反りが発生する。厚み 0. 5mm,サイズ 2 20111111の駆動1じを0. 5mm厚の無アルカリガラスに実装した場合には、反りの量 は約 20〜15 /ζ πιになる。そのため、光学接着シートで貼り合わせると IC実装部付近 力 の剥がれが多く発生した。 UVや可視光などの光で硬化する液状の光学透明接 着剤で全面貼り合わせした場合は、ディスプレイや透明カバープレートに反りがあつ ても、信頼性試験や使用環境においても剥離現象は軽減されるが、特許文献 1にあ る方法により貼り合わせを行った場合、図 16のように接着剤の液ダレが中央部だけ では接着剤を均一に充填するのが難し力つた。図 17に示すようにコーナー部で接着 剤の充填不足が発生した。コーナー部の接着剤の充填不足を解決するために図 18 のように複数液ダレを形成した場合には、充填工程で図 19、 20に示したように接着 剤は徐々に充填される力 塗布部と塗布部の間に空気が閉じ込められて気泡 11が 発生することが多い。
[0008] また、貼り合わせ時の巻き込んだ気泡の直径が 100 μ m以下の場合でも、フラット パネルディスプレイが、反射型である場合強い外光をあてた場合や、ノ ックライトを点 灯した場合など輝点となり、気泡の直径より大きく見え非常に目立った。
[0009] そこで、本発明の表示装置の製造方法は、多角形の透明体と表示素子が透明接 着剤で接着された表示装置の製造方法であって、透明体の接着面、または、表示素 子の接着面に液体接着剤を一定量点状に複数の箇所に塗布する工程と、点状に塗 布した複数の液体接着剤を結ぶように線状に接着剤を塗布する工程と、液体接着剤 を塗布した透明体または表示素子を反転する工程と、点状に塗布した液体接着剤に 液だれを形成する工程と、被着体に液だれに衝撃を加えな ヽように液体接着剤を接 触させ、更に液体接着剤を充填する工程と、液体接着剤を硬化する工程を備えるこ ととした。ここで、液体接着剤に UV硬化型接着剤または可視光硬化型接着剤を用い 、その接着剤の硬化収縮率を 1〜6%とした。また、透明体としては、タツチパネル、 プラスチック板またはガラス板が例示できる。さらに、液体接着剤として UVや可視光 などの光硬化型接着剤を用い、液体接着剤を硬化する工程において、透明体を通し て光を接着剤に照射する第一の硬化手段と透明体の側面方向より直接光を照射す る第二の硬化手段の 2つの硬化手段により液体接着剤を硬化させることとした。
[0010] また、本発明の貼り合せ方法は、多角形の透明板と板状の被着体とを透明接着剤 で接着する貼り合せ方法であって、透明板の接着面の接着面に液体接着剤を複数 の箇所に一定量点状に塗布する工程と、点状に塗布した液体接着剤を結ぶように線 状に液体接着剤を塗布する工程と、液体接着剤を塗布した透明板を反転する工程と 、点状に塗布した液体接着剤に液だれを形成する工程と、液だれに衝撃を加えない ように液体接着剤を被着体に接触させ、更に液体接着剤を充填する工程と、液体接 着剤を硬化する工程と、を備えることとした。さらに、液体接着剤は UVや可視光など の光硬化型接着剤であり、液体接着剤を硬化する工程において、透明体を通して光 を接着剤に照射する第一の硬化手段と透明体の側面方向より直接光を照射する第 二の硬化手段の 2つの硬化手段により液体接着剤を硬化することとした。
図面の簡単な説明
[0011] [図 1]透明基板の上面図である。
[図 2]本発明による透明基板の接着剤を点塗布した状態の上面図である。
[図 3]本発明による透明基板の接着剤を線と付した状態の上面図である。
[図 4]本発明による透明基板とフラットディスプレイを位置合わせした状態を示す側面 図である。
[図 5]本発明による接着剤の液ダレを示す側面図である。
[図 6]本発明による接着剤がフラットディスプレイに接触した状態を示す側面図である 圆 7]本発明による接着剤がフラットディスプレイに接触した状態を示す上面図である
[図 8]本発明による接着剤がフラットディスプレイに接着剤の塗布形状に濡れた状態 を示す上面図である。
[図 9]本発明による接着剤の初期の充填の状態を示す上面図である。
[図 10]本発明による接着剤の中期の充填の状態を示す上面図である。
[図 11]本発明による接着剤の終期の充填の状態を示す上面図である。
[図 12]本発明による貼り合わせが完了した状態の側面図である。
[図 13]本発明による他の接着剤の塗布形状を示す模式図である。
[図 14]本発明による他の接着剤の塗布形状を示す模式図である。
[図 15]本発明による接着剤に含まれた気泡の硬化前と硬化後の直径を示す図である
[図 16]従来方式による透明板に接触剤を塗布した状態を示す上面図である。
[図 17]従来方式による透明板とフラットディスプレイとの接着剤が充填した状態を示 す上面図である。
[図 18]従来方式による他の透明板に接着剤を塗布した状態を示す上面図である。
[図 19]従来方式による他の透明板とフラットディスプレイとの充填の初期の状態を示 す上面図である。
[図 20]従来方式による他の透明板とフラットディスプレイとの充填の中期の状態を示 す上面図である。
符号の説明
1 透明板
2 接着剤
3 フラットディスプレイ
4 TFTアレイを形成した透明基板
5 カラーフィルターを形成した透明基板
6 表示面側の偏光板 7 裏面側の偏光板
8 ドライバ
9 FPC
10 フラットディスプレイの表面に濡れた接着剤
発明の実施するための最良の形態
[0013] 本発明は、多角形の透明板と板状体とを透明接着剤で接着する方法において、透 明板の接着面または、板状体の接着面に液体接着剤を少なくとも複数の箇所に一 定量塗布する工程と、前記塗布した複数の接着剤を線状につなげる接着剤を塗布 する工程と、もしくは、接着剤を連続した線とその線と重なる位置に線で塗布した量よ り多い接着剤を 1箇所以上点状に塗布する工程と、接着剤を塗布した透明板もしくは 、板状体を反転する工程と、接着剤に液だれを形成し対する被着体に、接着剤を接 触し、更に接着剤を充填する工程と、透明板側から光を照射し、接着剤を硬化する 工程とした。
[0014] 特に各角付近に一定量を塗布することで、部分部分での接着剤の量のバランスが 可能となり接着剤の厚みが均一になる。また塗布した接着剤と中心部とを線状に接 着剤を塗布するとこで、充填時の空気の巻き込みによる気泡を解決した。接着剤の 塗布は、一定量塗布し線状に塗布し更に一定量塗布し更に線状に塗布する工程を 繰り返して、一筆書きで接着剤を塗布してもよい。一筆書きの場合は、線状に塗布し た箇所は 2度書きしてもよ ヽ。接着剤塗布後に接着剤を塗布した側の基板を反転し て、液ダレを形成し、その液ダレを対向する側の基板にゆっくりと接触する。各角付 近と中央に塗布した接着剤の液ダレが接触したところで、接着剤を塗布した基板の 下降スピードを上げてもよ 、。
[0015] 透明タツチパネルでも透明カバープレートでも同様にフラットディスプレイに気泡無 くまた、均一な接着剤層で接着が可能である。また、接着剤は UV硬化型接着剤もし くは、可視光硬化型接着剤で、硬化収縮率が 1〜6%とすることで、硬化収縮による 色むらに影響なぐ接着剤が硬化前に含まれる気泡の大きさが、接着剤が硬化収縮 することにより小さくなり、 100 m以下の気泡を削減することができた。
[0016] また、透明板に不透明領域がある場合には、透明板正面より透明板を通して光を 接着剤に照射し硬化する方法では、不透明領域により不透明領域と重なる部分には 光が照射されない。そこで、透明板の側方より光を照射することで、不透明領域と重 なる部分の接着剤を硬化することができた。
長方形の透明カバープレートもしくはタツチパネルとフラットディスプレイを貼り合せ るのに適した方法は下記のとおりである。接着剤の粘度は 3000〜2000cPが適して いる。接着剤の接着層を約 100 mにした場合、塗布量は接着面積換算で 0. 0135 g/cm2± 10%である。透明カバープレートの接着面側に接着部の中央と接着する各 角の付近に液ダレを形成する接着剤を点塗布する。 1点の塗布量は、その全塗布量 の 50〜80%の量をほぼ均等に分けた量である。残った接着剤で各角に点塗布した 接着剤と中央部とを接続するように線塗布する。このとき気泡が入らな 、ように塗布 する。塗布し終わった透明カバープレートを反転し、点塗布した接着剤に液ダレを形 成する。フラットディスプレイと前後横方向の位置を合わせ約 20 mZsecのスピード でフラットディスプレイと前記液ダレとを衝撃が加わらな 、ように接触させる。更にほぼ 同じスピードでフラットディスプレイと透明カバープレートの間隔を狭める。線塗布した 接着剤の領域でフラットディスプレイと透明カバーパネルとの間に接着剤が濡れた時 点で、透明カバープレートを前後左右の位置がずれないようにし、自重で充填する状 態にして、約 30〜120sec放置し、全面に充填する。充填が完了した時点で接着剤 を硬化するための UVを透明カバープレート正面とその側方より同時に照射し、貼り 付けが完成する。接着剤は、 UV硬化型であり硬化収縮率は約 2%である。
(実施例 1)
以下に本発明の実施例を図面に基づいて説明する。図 1は、フラットディスプレイの 全面に配置する透明板 1であり、材料はアクリルである。厚みは 1. 5mmである。大き さは、 40 X 40mmである。ディスプレイの外形サイズは、 45 X 32mmで厚みは 1. 3 mmである。表示画面のエリアは、 36 X 28. 5mmである。ディスプレイは、液晶ディ スプレイ 3の表示画面のエリアより大きい範囲には、額縁形状の黒色との印刷物を形 成してある。印刷物は、ディスプレイ側の面に形成する。印刷の他にスパッタなどの方 法により金属膜を形成し、更に印刷物を積層する場合もある。図 2は透明板の接着面 に、接着剤 2を点塗布で各角と中央に 5点塗布した上面図である。接着剤 2は、接着 面積に対して約 0. 01318gZcm2を塗布する。この場合は、総量として 0. 1687g塗 布する。点塗布の接着剤 2の量は、 1点あたり約 0. 028g塗布する。また、この接着剤 は、紫外線硬化型接着剤で、硬化後の特性としては、弾性率は 1. 6 X 106Paで屈折 率は 1. 52である。更に図 3に示すように各角に塗布した接着剤 2と中央に塗布した 接着剤 2とを線状に接着剤 2を塗布する。線状に塗布する接着剤は、点塗布した接 着剤間に塗布する他に、点塗布した接着剤より外周側に塗布してもよい。
[0018] 次に図 4に示すように接着剤 2を塗布した透明板 1を反転し、接着剤 2と接触しない 高さを保持してディスプレイ 3と位置を合わせる。ディスプレイ 3は TFTアレイを形成し たガラス基板 4とカラーフィルターを形成したガラス基板 5の間に液晶を封入してある 。その表面に表示面側の偏光板 6と裏面側の偏光板 7とを配置してある。ディスプレイ を駆動するドライバ IC6とコントローラーと接続するインターフェース FPCが実装され ている。
[0019] このとき図 5に示すように点塗布した接着剤 2に液ダレが生じる。透明板 1を約 20 mZsecのスピードで降下して、図 6に示すように接着剤 2がディスプレイ 3の表面に 点状に接触する。下降スピードは遅い方がよい。下降スピードが速いと接着剤がディ スプレイの表面に接触する衝撃で接着剤 2の表面に波紋が生じ更に透明板の下降 が進むため、複数の気泡の混入が生じることがある。
[0020] 点塗布した接着剤 2はディスプレイ 3と接触し濡れ始める。このときの透明板の上面 カゝら見た状態を図 7に示した。ディスプレイと濡れた接着剤 10が点状となる。更に下 降を進め塗布した形状に、接着剤が図 8のように濡れる。塗布した形状に濡れる前に 、透明板 1をフリーにすると気泡が混入することがある。
[0021] この状態で、透明板 1をフリーの状態にし、自重で接着剤を充填する。接着剤は図 9,図 10,図 11に示すように接着剤 10が充填される。充填時間は約 60秒である。気 泡の混入や空気の閉じ込めの生じない充填ができる。加圧した場合には接着剤の充 填にムラができ、かつ接着剤層の厚みが不均一となると液晶のギャップに影響を及 ぼし、表示ムラになることがある。
[0022] 図 12に示すように透明板 1とディスプレイ 3の間に充填が完了し、接着剤に 2000m Jの紫外線を照射して硬化して完了する。接着剤 2の透明板 1への塗布形状は、図 3 に示す形状だけではなぐ図 13や図 14のような形状でもよい。点塗布する接着剤は 、各角より中央を多くしてもよし、逆に中央を少なくしてもよい。
[0023] また、接着剤 2は紫外線および可視光硬化型で硬化収縮率が 1〜6%とすることで 、接着剤に含まれていた硬化前の約 100 m以下の気泡を、硬化することで消滅す ることができる。約 100 μ m以上の気泡が貼り合わせ時に発生しなければ、気泡の無 い貼りあわせが可能となる。図 15は、硬化収縮率 4%の接着剤の気泡のサイズであ る。
[0024] 透明基板は、アナログ方式や静電容量方式や超音波などのタツチパネルでもよい 。または、サフアイャガラス、アルカリガラス、ソーダガラス、およびその強化ガラス、 P MMA, PCなどや、またそれらの積層体でもよい。フラットディスプレイは、 TFT液晶 方式だけではなく STN液晶や他の液晶ディスプレイ、有機 ELや無機 EL、プラズマ ディスプレイなどのフラットディスプレイでもよい。接着剤は、 UV硬化型だけでなく可 視光硬化型でも UV,可視光の併用の硬化型でもよ!/ヽ。
産業上の利用可能性
[0025] 上述した貼り合せ方法により、気泡の混入および被着体の反りによる経時的剥離の 発生が解決した。また、気泡の混入が無く均一な接着剤層を得ることができた。その ため、透明カバーパネルとフラットパネルディスプレイの間隔を約 200〜30 μ mにす ることが可能となった。

Claims

請求の範囲
[1] 多角形の透明体と表示素子が透明接着剤で接着された表示装置の製造方法であつ て、前記透明体の接着面、または、前記表示素子の接着面に液体接着剤を一定量 点状に複数の箇所に塗布する工程と、前記点状に塗布した複数の液体接着剤を結 ぶように線状に接着剤を塗布する工程と、前記液体接着剤を塗布した透明体または 表示素子を反転する工程と、前記点状に塗布した液体接着剤に液だれを形成する 工程と、対する被着体に前記液だれに衝撃を加えな！/ヽように前記液体接着剤を接触 させ、更に前記液体接着剤を充填する工程と、前記液体接着剤を硬化する工程と、 を備えることを特徴とする表示装置の製造方法。
[2] 前記液体接着剤は UV硬化型接着剤または可視光硬化型接着剤であり、硬化収縮 率が 1〜6%であることを特徴とする請求項 1に記載の表示装置の製造方法。
[3] 前記透明体は、タツチパネル、プラスチック板またはガラス板であることを特徴とする 請求項 1記載の表示装置の製造方法。
[4] 前記液体接着剤を硬化する工程にお！ヽて、前記液体接着剤は UVや可視光などの 光硬化型接着剤であり、前記透明体を通して光を接着剤に照射する第一の硬化手 段と前記透明体の側面方向より直接光を照射する第二の硬化手段の 2つの硬化手 段により前記液体接着剤を硬化することを特徴とする請求項 1に記載の表示装置の 製造方法。
[5] 多角形の透明板と板状の被着体とを透明接着剤で接着する貼り合せ方法であって、 前記透明板の接着面の接着面に液体接着剤を複数の箇所に一定量点状に塗布す る工程と、前記点状に塗布した液体接着剤を結ぶように線状に液体接着剤を塗布す る工程と、前記液体接着剤を塗布した透明板を反転する工程と、前記点状に塗布し た液体接着剤に液だれを形成する工程と、前記液だれに衝撃を加えな ヽように前記 液体接着剤を前記被着体に接触させ、更に前記液体接着剤を充填する工程と、前 記液体接着剤を硬化する工程と、を備えることを特徴とする貼り合せ方法。
[6] 前記液体接着剤は UVや可視光などの光硬化型接着剤であり、前記液体接着剤を 硬化する工程において、前記透明体を通して光を接着剤に照射する第一の硬化手 段と前記透明体の側面方向より直接光を照射する第二の硬化手段の 2つの硬化手 段により前記液体接着剤を硬化することを特徴とする請求項 5に記載の貼り合せ方 法。
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CN101317205A (zh) 2008-12-03
US20090283211A1 (en) 2009-11-19
KR20080081248A (ko) 2008-09-09
EP1973089A4 (en) 2009-09-09
DE602006019317D1 (de) 2011-02-10
KR101168469B1 (ko) 2012-07-26
JPWO2007063751A1 (ja) 2009-05-07
JP4717921B2 (ja) 2011-07-06
CN101317205B (zh) 2010-11-03

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