US20120118483A1 - Method for producing display device - Google Patents
Method for producing display device Download PDFInfo
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- US20120118483A1 US20120118483A1 US13/332,922 US201113332922A US2012118483A1 US 20120118483 A1 US20120118483 A1 US 20120118483A1 US 201113332922 A US201113332922 A US 201113332922A US 2012118483 A1 US2012118483 A1 US 2012118483A1
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- cured resin
- display device
- display
- protective part
- protective
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—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
- G02F1/133331—Cover glasses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/02—Materials and properties organic material
- G02F2202/022—Materials and properties organic material polymeric
- G02F2202/023—Materials and properties organic material polymeric curable
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/02—Materials and properties organic material
- G02F2202/022—Materials and properties organic material polymeric
- G02F2202/023—Materials and properties organic material polymeric curable
- G02F2202/025—Materials and properties organic material polymeric curable thermocurable
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/11—Methods of delaminating, per se; i.e., separating at bonding face
- Y10T156/1168—Gripping and pulling work apart during delaminating
- Y10T156/1179—Gripping and pulling work apart during delaminating with poking during delaminating [e.g., jabbing, etc.]
- Y10T156/1184—Piercing layer during delaminating [e.g., cutting, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
Definitions
- the present disclosure is generally directed to a display device, such as, for example, a liquid crystal display device (LCD) used in a cellular phone.
- a display device such as, for example, a liquid crystal display device (LCD) used in a cellular phone.
- the present disclosure is directed to a method for producing a display device provided with a transparent protective part on a display part.
- LCD liquid crystal display device
- FIG. 7 illustrates a conventional type of display device known in the art.
- a liquid crystal display device 101 is provided with a transparent protective part 103 formed from, for example, glass or plastic, on a liquid crystal display panel 102 .
- a gap 105 between the liquid crystal display panel 102 and the protective part 103 is formed by spacers 104 arranged between the liquid crystal display panel 102 and the protective part 103 .
- the gap 105 between the liquid crystal display panel 102 and the protective part 103 scatters light, resulting in a decrease in contrast and luminance.
- the presence of the gap 105 also makes it more difficult to produce a thinner panel.
- Embodiments are provided in order to achieve the above object, and include a method for producing a display device, the display device comprising a display part for displaying an image with a light-transmitting protective part provided on the display part, and a light-transmitting cured resin layer arranged between the display part and the protective part.
- the method for producing a display device according to the present invention includes the steps (a) to (c), and, depending on the presence of defects in the display device, the following additional steps (d) to (f) are performed:
- FIG. 1 is a flow diagram illustrating an example of a method for producing a display device according to embodiments.
- FIGS. 2( a ) to ( e ) are cross-sectional views schematically illustrating the method for producing a display device according to embodiments.
- FIGS. 3( a ) to ( c ) are cross-sectional views schematically illustrating a method for producing the display device according to the present disclosure.
- FIG. 4 is an explanatory diagram illustrating an example of a method for cutting a cured resin layer according to embodiments.
- FIG. 5 is an explanatory diagram illustrating another example of a method for cutting a cured resin layer according to embodiments.
- FIGS. 6( a ) to ( c ) are explanatory diagrams schematically illustrating a method for wiping away a cured resin by an organic solvent.
- FIG. 7 is cross-sectional view illustrating a configuration of a conventional display device.
- an advantageous effect is achieved even when the storage elastic modulus of the cured resin layer is less than 1.0 ⁇ 10 5 Pa.
- the organic solvent can be selected from among organic solvents which are compatible when mixed with the resin composition before curing in a 1:1 volume ratio.
- the removing solution may contain limonene or toluene as the organic solvent.
- the removing solution may contain, in addition to limonene, ethyl alcohol or isopropyl alcohol as the organic solvent.
- the protective part may be formed from a polymer material, and the removing solution contains limonene as the organic solvent.
- an advantageous effect is achieved even when the display device is a liquid crystal display device in which a polarizing plate is provided on a surface of the display part.
- the display part and the protective part are separated by a wire having a smaller diameter than the thickness of the cured resin layer.
- the wire is then brought into contact with a side face of the cured resin layer where the protective part and the display part are bonded, and the wire is made to move through the cured resin layer.
- the cured resin layer adhered to the separated display part and the protective part is peeled off and removed using a removing solution comprising an organic solvent. Since a procedure for peeling off the display part and the protective part is not conducted during the repair operation, the display part and the protective part are not damaged by, for example, scratching and cracking.
- the display part and the protective part can be separated by cutting the cured resin layer more smoothly and quickly when the modulus of elasticity of the cured resin layer is less than 1.0 ⁇ 10 5 Pa.
- the cured resin layer that is adhered to the separated display part and the protective part can be dissolved and removed smoothly and reliably.
- an organic solvent that is compatible when mixed with the resin composition before curing in a 1:1 volume ratio for example, limonene or toluene
- the removing solution is capable of improving the peeling properties of the cured resin, and thus improves operational efficiency by increasing volatility of the removing solution.
- a repair operation can be carried out easily and quickly.
- one embodiment provides a method for producing a display device of which a repair operation can be carried out easily and reliably without damage to a bonding portion caused by the cured resin.
- FIG. 1 is a flow diagram illustrating an example of a method for producing a display device according to an embodiment.
- FIGS. 2( a ) to ( c ) and FIGS. 3( a ) to ( c ) are cross-sectional views schematically illustrating the method for producing the display device according an embodiment.
- a resin composition layer 4 is coated and formed by, for example, dropping a photocurable resin composition (referred to as “resin composition,” “resin,” or the like, hereinafter) in a predetermined amount onto the surface of a display part 2 (step S 1 ).
- a photocurable resin composition referred to as “resin composition,” “resin,” or the like, hereinafter
- this resin composition layer 4 can also be formed by a printing method.
- a spacer for determining the distance between the display part 2 and a protective part 3 is not required to be used. Instead, as an example, the distance between the display part 2 and the protective part 3 can be determined by a positioning means (not shown). However, the present disclosure is not meant to be limited to such embodiments and, thus, in various embodiments a spacer can also be used.
- a polarizing plate (not shown) is provided on the display part 2 .
- a light-transmitting glass plate or a substrate formed of a polymer material (plastic) such as an acrylic resin (for example, PMMA: polymethyl methacrylate) may be suitably used as the protective part 3 .
- Such a protective part 3 is lowered while being kept in a horizontal state, and the protective part 3 is then fixed at a predetermined position by a positioning hoist mechanism (not shown).
- the resin composition layer 4 is placed and fills a gap between the display part 2 and the protective part 3 (step S 2 ).
- a resin composition which has, after curing, a transmittance of 90% or higher, a storage elastic modulus at 25° C. of 1.0 ⁇ 10 5 Pa or less, and a curing shrinkage ratio of 5% or less can be used.
- the viscosity of the photocurable resin composition is not especially limited.
- a photocurable resin composition having a viscosity in a range of 1,000 mPa ⁇ s to 5,000 mPa ⁇ s, such as a range of 2,000 mPa ⁇ s to 3,000 mPa ⁇ s can be used.
- the photocurable resin composition may have a photoreactive acrylate material, such as polyurethane acrylate and isobornyl acrylate, and a photopolymerization initiator as main components, and may include additional additives, such as a sensitizing agent, a plasticizer, transparent particles and the like, within the scope of the object of the present disclosure.
- a photoreactive acrylate material such as polyurethane acrylate and isobornyl acrylate
- a photopolymerization initiator as main components
- additional additives such as a sensitizing agent, a plasticizer, transparent particles and the like, within the scope of the object of the present disclosure.
- photopolymerization initiator examples include 1-hydroxy-cyclohexyl-phenyl-ketone (sold under the name “IRGACURE 184” manufactured by Ciba Specialty Chemicals Inc.), and the like.
- the protective part 3 may be provided with a UV-region cutting function in order to protect the display part 2 against UV rays.
- a photopolymerization initiator used in the present embodiment, it is beneficial to use a photopolymerization initiator that can cure the resin composition even in the visible light region (for example, sold under the name SPEEDCURE TPO, manufactured by Nihon SiberHegner KK).
- the resin composition is prepared such that the cured resin obtained by curing the resin composition with UV irradiation has a storage elastic modulus (at 25° C.) of 1 ⁇ 10 5 Pa or less, such as 1 ⁇ 10 3 to 1 ⁇ 10 5 Pa, a refractive index of 1.45 or more to 1.55 or less, such as 1.51 or more to 1.52 or less, and a transmittance of 90% or higher in the visible light region when the cured resin has a thickness of 100 ⁇ m.
- a storage elastic modulus at 25° C.
- the cured resin formed by curing such a curable resin composition may have a storage elastic modulus (at 25° C.) that exceeds 1 ⁇ 10 5 Pa.
- the resin composition is prepared so as to have a curing shrinkage ratio of 5.0% or less, such as 4.5% or less, 4.0% or less, or 0 to 2%. Consequently, the internal stress that builds up in the cured resin during curing of the resin composition can be reduced, and distortion at the interface between the cured resin layer 5 and the display part 2 or the protective part 3 can be prevented.
- the resin composition When the resin composition is arranged between the display part 2 and the protective part 3 and then cured, the amount of light scattered at the interface between the cured resin layer 5 and the display part 2 or the protective part 3 can be reduced. As a result, the luminance and the visibility of the display image can be improved.
- the magnitude of the internal stress that builds up in the cured resin during curing can be evaluated by dropping the resin composition onto a flat plate, curing the resin composition, and measuring the average surface roughness of the resulting cured resin.
- the distortion generated at the interface between the display part or the protective part and the cured resin composition arranged therebetween can be disregarded if, for example, a cured resin evaluated by dropping 2 mg of the resin composition onto a glass plate or an acrylic plate and cured by UV irradiation to a 90% or higher cure ratio has an average surface roughness of 6.0 nm or less.
- this average surface roughness can be maintained at 6.0 nm or less, such as 5.0 or less; or in the range of 1 to 3 nm.
- a glass plate for sandwiching the liquid crystals of a liquid crystal cell, or used as a protective plate for a liquid crystal cell can be used.
- an acrylic plate can also be used as the protective plate for a liquid crystal cell.
- Such glass plates or acrylic plates typically have an average surface roughness of 1.0 nm or less.
- the resin composition layer 4 is irradiated with UV rays via the protective part 3 to cure the resin (step S 3 ).
- the irradiation direction of the UV rays is not especially limited. However, from the standpoint of achieving more uniform curing of the resin, a direction perpendicular to the surface of the protective part 3 of the display part 2 is suitable.
- UV rays may also be simultaneously directly irradiated from the external side face of the resin composition layer 4 between the display part 2 and the protective part 3 , using an optical fiber, for example.
- step S 4 the presence of foreign substances or air bubbles mixed in the cured resin layer 5 that is filled between the display part 2 and the protective part 3 is checked.
- step S 5 if the result of the check is favorable, the method is finished.
- step S 6 the display part 2 and the protective part 3 are separated by cutting the cured resin layer 5 using a wire 20 , as illustrated in FIGS. 3( a ) and 3 ( b ).
- FIGS. 4 and 5 are explanatory diagrams illustrating embodiments of a method for cutting a cured resin layer according to the present disclosure.
- the wire 20 is passed over a pair of pulleys 10 and 11 .
- the cured resin layer 5 located between the display part 2 and the protective part 3 , is pressed against the wire 20 while the wire 20 is slid in a left-right direction as shown in FIG. 4 , which corresponds to the width direction of the display part 2 and the protective part 3 .
- a panel 1 is moved in a direction orthogonal to the wire 20 so as to cut the cured resin layer 5 and thereby separate the display part 2 and the protective part 3 .
- the wire 20 is passed over a plurality of pulleys 10 to 13 which are arranged so as to form a pair of pulley blocks. Furthermore, tension springs 14 and 15 , for absorbing slack in the wire 20 between the pulleys 10 and 11 , are connected to the pulleys 12 and 13 , respectively, which move as a pulley block.
- the cured resin layer 5 between the display part 2 and the protective part 3 is pressed against the wire 20 . Then, the panel 1 is moved in a direction orthogonal to the wire 20 to cut the cured resin layer 5 and thereby separate the display part 2 and the protective part 3 .
- the slack in the wire 20 between the pulleys 10 and 11 is absorbed by the elastic force of the tension springs 14 and 15 , such that the wire 20 between the pulleys 10 and 11 is constantly in a taut state.
- a metal wire such as one made of carbon steel, (for example, piano wire) can be used, or the like.
- the thickness (diameter) of the wire 20 is not especially limited, as long as it is less than the thickness of the cured resin layer 5 between the display part 2 and the protective part 3 .
- a suitable thickness of a wire can be in the range of 50 ⁇ m to 100 ⁇ m.
- step S 7 the cured resin remaining on the surfaces of the display part 2 and the protective part 3 is wiped away by a removing solution containing an organic solvent (step S 7 ).
- FIGS. 6( a ) to ( c ) are explanatory diagrams schematically illustrating a method for wiping away a cured resin by an organic solvent.
- FIGS. 6( a ) and 6 ( b ) illustrate an embodiment where the resin composition on the display part (for example, LCD cell) or protective part (for example, plastic plate or glass plate) is cured by the irradiation of UV rays.
- the resin composition on the display part for example, LCD cell
- protective part for example, plastic plate or glass plate
- an organic solvent-containing removing solution is coated by dropping or spraying, for example, onto the cured resin.
- the coated cured resin is then left for approximately 5 minutes at room temperature, for example, to impregnate the removing solution into the cured resin, which then swells.
- the cured resin is then wiped away using a wipe member formed of an elastomer or the like which is impregnated with the same solvent as the organic solvent of the removing solution that was coated on the cured resin.
- an organic solvent which is compatible when mixed with the resin composition before curing in a 1:1 volume ratio or more specifically, an organic solvent having a small solution parameter (SP value), can be used.
- an organic solvent having a solution parameter of less than 9 can be suitably used.
- the cured resin remaining on the surfaces of the display part 2 and the protective part 3 can be completely removed.
- an organic solvent which does not cause damage to the device such as, for example, changes to the polarizing plate (made of triacetyl cellulose) provided on the display part 2 .
- suitable organic solvents include limonene (C 10 H 16 , solution parameter: 0.6) or toluene (C 7 H 8 , solution parameter: 8.8).
- ethyl alcohol or isopropyl alcohol may be added to the removing solution.
- limonene is a suitable organic solvent.
- limonene may be used as the organic solvent, allowing the cured resin to be wiped away without causing any changes to the surface of the substrate.
- the wiping properties and volatility can be improved by adding ethyl alcohol and/or isopropyl alcohol.
- step S 8 the wiped surfaces of the display part 2 and the protective part 3 are examined to observe any changes in the appearance with, for example, in step S 8 . If there is no cured resin residue present and no changes on the surface have occurred, the process returns to step S 1 , and the above-described steps are repeated from the start in step S 9 .
- step S 9 if in step S 9 , there is a cured resin residue remaining on the surfaces of the display part 2 and the protective part 3 , or if surface changes have occurred, the produced display device is treated as a defective product.
- the display device was moved against the wire when cutting the cured resin layer 5 .
- the present disclosure is not limited thereto and the wire may be moved against the display device.
- the present disclosure is not limited to the above-discussed liquid crystal display device.
- the present invention may also be applied to various flat panel display panels, such as an organic EL device.
- a resin composition was prepared by kneading in a kneader 70 parts by weight of an ester compound formed from a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate, 30 parts by weight of dicyclopentenyl oxyethyl methacrylate, 10 parts by weight of 2-hydroxybutyl methacrylate, 30 parts by weight of a terpene series hydrogenated resin, 140 parts by weight of a butadiene polymer, 4 parts by weight of a photopolymerization initiator, and 0.5 parts by weight of a visible light region photopolymerization initiator.
- the resin composition prepared in the above-described blend was dropped onto a white glass plate having thickness of 100 ⁇ m, to be used as a protective part.
- the plate was transferred by a UV-conveyor in a UV-ray irradiation apparatus to cure the resin.
- the thickness of the cured resin was 100 ⁇ m.
- the transmittance of this cured resin was measured using a UV-Visible Spectrophotometer (V-560, JASCO Corporation) to be 90% or higher.
- curing shrinkage ratio specific gravities of the resin solution before curing, and the cured solid product were measured by an electronic densimeter (sold under the name “SD-120L”, manufactured by Mirage).
- SD-120L electronic densimeter
- the curing shrinkage ratio is calculated by the following equation based on the difference of the specific gravities between the resin solution before curing and the cured solid product. In the present example, curing shrinkage ratio was 1.8%.
- Curing shrinkage ratio (%) (Cured product specific gravity ⁇ Resin solution specific gravity)/Cured product specific gravity ⁇ 100
- the cured resin had a modulus of elasticity of 1 ⁇ 10 4 Pa and a curing shrinkage ratio of 1.8%. Consequently, the average surface roughness Ra was 2.7 nm, and there was hardly any distortion, meaning that superior results were obtained. Therefore, a display device which is free from distortion can be obtained by arranging and filling such a cured resin between the display part and the protective part.
- the above-discussed resin composition was coated onto the above-described glass plate for a protective part or glass plate for an LCD cell. Then, as shown in FIG. 6( b ), the resin composition was cured by irradiating with UV rays.
- limonene, toluene, or MEK was coated onto the cured resin as an organic solvent, and the coated cured resin was left for 5 minutes at room temperature.
- the resin composition was dropped under the same conditions as the above-described Reference Example onto a glass plate for a protective part where the wiping step was finished. The resin composition was then cured under the same conditions.
- the resin composition was dropped under the same conditions as the above-described Reference Example onto a glass plate for an LCD cell of which the wiping step was finished.
- the distortion of the surface was measured under the same conditions as the above-described Reference Example.
- the measured average surface roughness Ra was equivalent (within the margin of error) to that of the Reference Example.
- a repair operation can be carried out easily and reliably without damage to the bonded portion caused by the cured resin. It is thus understood that a display device without distortion can be obtained in a good yield.
- the resin composition of Reference Example was prepared by kneading in a kneader 50 parts by weight of polybutadiene acrylate, 20 parts by weight of hydroxyethyl methacrylate, 3 parts by weight of a photopolymerization initiator, and 1 part by weight of a visible light region photopolymerization initiator.
- the resin composition prepared in the above-described composition was dropped onto the above-described glass plate for a protective part, and cured under the same conditions as described above.
- the transmittance of this cured resin was measured under the same conditions as the above examples and the measured result was 90% or higher.
- the modulus of elasticity of the cured resin was measured under the same conditions as the above examples and the measured result was 2.0 ⁇ 10 7 Pa.
- the resin composition was dropped under the same conditions as for the above-described examples onto a glass plate for an LCD cell.
- the distortion of the surface was measured under the same conditions as for the above examples and the measured result was 12.4 nm.
- the cured resin had a modulus of elasticity of 2 ⁇ 10 7 Pa and a curing shrinkage ratio of 5.6%. Consequently, the average surface roughness Ra was 12.4 nm, and the level of distortion was greater than the roughness of the above examples.
- the above resin composition was coated onto the above-described glass plate for a protective part or glass plate for an LCD cell. Then, the resin composition was cured by irradiating with UV rays.
- limonene or toluene was coated onto the cured resin and the coated cured resin was left to sit for 5 minutes at room temperature.
Abstract
A method for producing a display device includes: (a) coating a resin composition on at least one of a display part and a protective part, (b) closely adhering the display and protective parts via a resin composition interposed therebetween, and (c) arranging the cured resin layer between the display and protective parts by curing the resin composition by irradiating UV rays on an external side of the protective part. If a defect is detected, the method includes: (d) separating the display and protective parts by applying a wire to a side face of the cured resin layer where the protective and display parts are bonded and moving the wire through the cured resin layer, (e) peeling off and removing the cured resin adhered to the separated display and protective parts by a removing solution which contains an organic solvent, and (f) repeating steps (a) to (c).
Description
- This is a Continuation of application Ser. No. 12/656,088 filed Jan. 15, 2010, which in turn is a continuation of International Application No. PCT/JP2008/062855 filed Jul. 16, 2008, which claims priority to Japanese Patent Document No. 2007-186360, filed on Jul. 17, 2007, Japanese Patent Document No. 2008-005027, filed on Jan. 11, 2008, and Japanese Patent Document No. 2008-105109, filed on Apr. 14, 2008. The entire disclosures of the above-mentioned applications are incorporated herein by reference in their entireties.
- The present disclosure is generally directed to a display device, such as, for example, a liquid crystal display device (LCD) used in a cellular phone. In particular, the present disclosure is directed to a method for producing a display device provided with a transparent protective part on a display part.
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FIG. 7 illustrates a conventional type of display device known in the art. As shown inFIG. 7 , a liquidcrystal display device 101 is provided with a transparentprotective part 103 formed from, for example, glass or plastic, on a liquidcrystal display panel 102. In this conventional device, in order to protect the surface of the liquidcrystal display panel 102 and a polarizing plate (not shown), agap 105 between the liquidcrystal display panel 102 and theprotective part 103 is formed byspacers 104 arranged between the liquidcrystal display panel 102 and theprotective part 103. - However, the
gap 105 between the liquidcrystal display panel 102 and theprotective part 103 scatters light, resulting in a decrease in contrast and luminance. The presence of thegap 105 also makes it more difficult to produce a thinner panel. - In view of these difficulties, it has been proposed to fill the gap between the liquid crystal display panel and the protective part with a resin (for example, see Japanese Patent Publication No. 2005-55641).
- However, if foreign substances or air bubbles become trapped in the resin that fills the gap between the liquid crystal display panel and the protective part, it becomes necessary to conduct a repair operation by peeling apart the display panel and the protective part.
- However, when the display panel and the protective part are peeled apart, there is a risk of causing damage, such as scratching and cracking the display panel and the protective part.
- Furthermore, completely removing a cured resin adhered to the display panel and the protective part by a solvent is very difficult.
- While there are some solvents which have high solubility against this type of cured resin, there are drawbacks with respect to safety. Moreover, in order to completely remove the solvent itself, a separate washing step is required.
- The present disclosure was made in consideration of these needs and other needs present in the conventional art. Accordingly, it is an object of embodiments to provide a method for producing a display device for which a repair operation can be carried out easily and reliably without damage to a bonding portion by a cured resin.
- Embodiments are provided in order to achieve the above object, and include a method for producing a display device, the display device comprising a display part for displaying an image with a light-transmitting protective part provided on the display part, and a light-transmitting cured resin layer arranged between the display part and the protective part. The method for producing a display device according to the present invention includes the steps (a) to (c), and, depending on the presence of defects in the display device, the following additional steps (d) to (f) are performed:
- (a) coating a resin composition, the resin composition comprising a raw material of the cured resin, on at least one of the display part and the protective part,
- (b) closely adhering the display part and the protective part with the resin composition interposed therebetween, and
- (c) arranging the cured resin layer between the display part and the protective part by curing the resin composition by irradiating UV rays on an external side of the protective part; and
- (d) separating the display part and the protective part from contact with each other by applying a wire having a smaller diameter than a thickness of the cured resin layer to a side face of the cured resin layer where the protective part and the display part are bonded together, and moving the wire through the cured resin layer,
- (e) peeling off and removing the cured resin adhered to the separated display part and the protective part by using a solution which contains an organic solvent, and
- (f) repeating the steps (a) to (c).
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FIG. 1 is a flow diagram illustrating an example of a method for producing a display device according to embodiments. -
FIGS. 2( a) to (e) are cross-sectional views schematically illustrating the method for producing a display device according to embodiments. -
FIGS. 3( a) to (c) are cross-sectional views schematically illustrating a method for producing the display device according to the present disclosure. -
FIG. 4 is an explanatory diagram illustrating an example of a method for cutting a cured resin layer according to embodiments. -
FIG. 5 is an explanatory diagram illustrating another example of a method for cutting a cured resin layer according to embodiments. -
FIGS. 6( a) to (c) are explanatory diagrams schematically illustrating a method for wiping away a cured resin by an organic solvent. -
FIG. 7 is cross-sectional view illustrating a configuration of a conventional display device. - According to the above-described embodiments, an advantageous effect is achieved even when the storage elastic modulus of the cured resin layer is less than 1.0×105 Pa.
- In embodiments, the organic solvent can be selected from among organic solvents which are compatible when mixed with the resin composition before curing in a 1:1 volume ratio.
- In embodiments, the removing solution may contain limonene or toluene as the organic solvent.
- In embodiments, the removing solution may contain, in addition to limonene, ethyl alcohol or isopropyl alcohol as the organic solvent.
- In embodiments, the protective part may be formed from a polymer material, and the removing solution contains limonene as the organic solvent.
- According to embodiments, an advantageous effect is achieved even when the display device is a liquid crystal display device in which a polarizing plate is provided on a surface of the display part.
- According to embodiments, after the display part and the protective part are bonded via a cured resin layer, if any defects are found, the display part and the protective part are separated by a wire having a smaller diameter than the thickness of the cured resin layer. The wire is then brought into contact with a side face of the cured resin layer where the protective part and the display part are bonded, and the wire is made to move through the cured resin layer. Afterwards, the cured resin layer adhered to the separated display part and the protective part is peeled off and removed using a removing solution comprising an organic solvent. Since a procedure for peeling off the display part and the protective part is not conducted during the repair operation, the display part and the protective part are not damaged by, for example, scratching and cracking.
- In one embodiment, the display part and the protective part can be separated by cutting the cured resin layer more smoothly and quickly when the modulus of elasticity of the cured resin layer is less than 1.0×105 Pa.
- According to one embodiment, by selecting an organic solvent that is compatible when mixed with the resin composition before curing in a 1:1 volume ratio (for example, limonene or toluene), the cured resin layer that is adhered to the separated display part and the protective part can be dissolved and removed smoothly and reliably.
- Moreover, in embodiments, with respect to the removing solution, when a solvent containing limonene or toluene is selected in the organic solvent, a change in the peeling property of the polarizing plate provided on the surface of the display part does not result.
- Furthermore, if ethyl alcohol or isopropyl alcohol is used in addition to limonene as the organic solvent in the removing solution, the removing solution is capable of improving the peeling properties of the cured resin, and thus improves operational efficiency by increasing volatility of the removing solution.
- According to one aspect of the present disclosure, especially for a liquid crystal display device in which a polarizing plate is provided on the surface of a display part, a repair operation can be carried out easily and quickly.
- As discussed above, one embodiment provides a method for producing a display device of which a repair operation can be carried out easily and reliably without damage to a bonding portion caused by the cured resin.
- Embodiments of the present disclosure will now be described in detail with reference to the drawings.
-
FIG. 1 is a flow diagram illustrating an example of a method for producing a display device according to an embodiment. -
FIGS. 2( a) to (c) andFIGS. 3( a) to (c) are cross-sectional views schematically illustrating the method for producing the display device according an embodiment. - As shown in
FIG. 2( a), aresin composition layer 4 is coated and formed by, for example, dropping a photocurable resin composition (referred to as “resin composition,” “resin,” or the like, hereinafter) in a predetermined amount onto the surface of a display part 2 (step S1). - In embodiments, this
resin composition layer 4 can also be formed by a printing method. - In embodiments, a spacer for determining the distance between the
display part 2 and aprotective part 3 is not required to be used. Instead, as an example, the distance between thedisplay part 2 and theprotective part 3 can be determined by a positioning means (not shown). However, the present disclosure is not meant to be limited to such embodiments and, thus, in various embodiments a spacer can also be used. - In various embodiments, including a liquid crystal display device, a polarizing plate (not shown) is provided on the
display part 2. - As a protective part, in embodiments, a light-transmitting glass plate or a substrate formed of a polymer material (plastic) such as an acrylic resin (for example, PMMA: polymethyl methacrylate) may be suitably used as the
protective part 3. - Such a
protective part 3 is lowered while being kept in a horizontal state, and theprotective part 3 is then fixed at a predetermined position by a positioning hoist mechanism (not shown). - As shown in
FIG. 2( b), theresin composition layer 4 is placed and fills a gap between thedisplay part 2 and the protective part 3 (step S2). - As a photocurable resin composition, in embodiments, a resin composition which has, after curing, a transmittance of 90% or higher, a storage elastic modulus at 25° C. of 1.0×105 Pa or less, and a curing shrinkage ratio of 5% or less can be used.
- According to one embodiment, the viscosity of the photocurable resin composition is not especially limited. However, from the perspective of the wet spreading speed and tendency not to run over (surface tension), in embodiments, a photocurable resin composition having a viscosity in a range of 1,000 mPa·s to 5,000 mPa·s, such as a range of 2,000 mPa·s to 3,000 mPa·s, can be used.
- More specifically, the photocurable resin composition may have a photoreactive acrylate material, such as polyurethane acrylate and isobornyl acrylate, and a photopolymerization initiator as main components, and may include additional additives, such as a sensitizing agent, a plasticizer, transparent particles and the like, within the scope of the object of the present disclosure.
- Examples of the photopolymerization initiator which may be used include 1-hydroxy-cyclohexyl-phenyl-ketone (sold under the name “IRGACURE 184” manufactured by Ciba Specialty Chemicals Inc.), and the like.
- The
protective part 3 may be provided with a UV-region cutting function in order to protect thedisplay part 2 against UV rays. In such an embodiment, as the photopolymerization initiator used in the present embodiment, it is beneficial to use a photopolymerization initiator that can cure the resin composition even in the visible light region (for example, sold under the name SPEEDCURE TPO, manufactured by Nihon SiberHegner KK). - In embodiments, the resin composition is prepared such that the cured resin obtained by curing the resin composition with UV irradiation has a storage elastic modulus (at 25° C.) of 1×105 Pa or less, such as 1×103 to 1×105 Pa, a refractive index of 1.45 or more to 1.55 or less, such as 1.51 or more to 1.52 or less, and a transmittance of 90% or higher in the visible light region when the cured resin has a thickness of 100 μm. Even when the major resin components constituting the resin composition are the same, if an additional resin component or monomer component added to the major resin components is different, the cured resin formed by curing such a curable resin composition may have a storage elastic modulus (at 25° C.) that exceeds 1×105 Pa.
- In embodiments, the resin composition is prepared so as to have a curing shrinkage ratio of 5.0% or less, such as 4.5% or less, 4.0% or less, or 0 to 2%. Consequently, the internal stress that builds up in the cured resin during curing of the resin composition can be reduced, and distortion at the interface between the cured
resin layer 5 and thedisplay part 2 or theprotective part 3 can be prevented. - When the resin composition is arranged between the
display part 2 and theprotective part 3 and then cured, the amount of light scattered at the interface between the curedresin layer 5 and thedisplay part 2 or theprotective part 3 can be reduced. As a result, the luminance and the visibility of the display image can be improved. - The magnitude of the internal stress that builds up in the cured resin during curing can be evaluated by dropping the resin composition onto a flat plate, curing the resin composition, and measuring the average surface roughness of the resulting cured resin. In practice, the distortion generated at the interface between the display part or the protective part and the cured resin composition arranged therebetween can be disregarded if, for example, a cured resin evaluated by dropping 2 mg of the resin composition onto a glass plate or an acrylic plate and cured by UV irradiation to a 90% or higher cure ratio has an average surface roughness of 6.0 nm or less. However, regarding the resin composition of the present disclosure, this average surface roughness can be maintained at 6.0 nm or less, such as 5.0 or less; or in the range of 1 to 3 nm.
- As a plate, in embodiments, a glass plate for sandwiching the liquid crystals of a liquid crystal cell, or used as a protective plate for a liquid crystal cell can be used.
- Furthermore, in embodiments, an acrylic plate can also be used as the protective plate for a liquid crystal cell. Such glass plates or acrylic plates typically have an average surface roughness of 1.0 nm or less.
- Subsequently, as shown in
FIG. 2( c), theresin composition layer 4 is irradiated with UV rays via theprotective part 3 to cure the resin (step S3). - According to embodiments, the irradiation direction of the UV rays is not especially limited. However, from the standpoint of achieving more uniform curing of the resin, a direction perpendicular to the surface of the
protective part 3 of thedisplay part 2 is suitable. - UV rays may also be simultaneously directly irradiated from the external side face of the
resin composition layer 4 between thedisplay part 2 and theprotective part 3, using an optical fiber, for example. - Then, in step S4, the presence of foreign substances or air bubbles mixed in the cured
resin layer 5 that is filled between thedisplay part 2 and theprotective part 3 is checked. - In step S5, if the result of the check is favorable, the method is finished.
- On the other hand, if a defect, such as foreign substances or air bubbles being mixed in the cured
resin layer 5 between thedisplay part 2 and theprotective part 3, is confirmed, a repair operation is carried out. - As part of the repair operation, in step S6, the
display part 2 and theprotective part 3 are separated by cutting the curedresin layer 5 using awire 20, as illustrated inFIGS. 3( a) and 3(b). -
FIGS. 4 and 5 are explanatory diagrams illustrating embodiments of a method for cutting a cured resin layer according to the present disclosure. - In the embodiment illustrated in
FIG. 4 , thewire 20 is passed over a pair ofpulleys resin layer 5, located between thedisplay part 2 and theprotective part 3, is pressed against thewire 20 while thewire 20 is slid in a left-right direction as shown inFIG. 4 , which corresponds to the width direction of thedisplay part 2 and theprotective part 3. Then, apanel 1 is moved in a direction orthogonal to thewire 20 so as to cut the curedresin layer 5 and thereby separate thedisplay part 2 and theprotective part 3. - In the embodiment illustrated in
FIG. 5 , thewire 20 is passed over a plurality ofpulleys 10 to 13 which are arranged so as to form a pair of pulley blocks. Furthermore, tension springs 14 and 15, for absorbing slack in thewire 20 between thepulleys pulleys - In another embodiment, the cured
resin layer 5 between thedisplay part 2 and theprotective part 3 is pressed against thewire 20. Then, thepanel 1 is moved in a direction orthogonal to thewire 20 to cut the curedresin layer 5 and thereby separate thedisplay part 2 and theprotective part 3. - Here, the slack in the
wire 20 between thepulleys wire 20 between thepulleys - As the
wire 20 used in embodiments, a metal wire, such as one made of carbon steel, (for example, piano wire) can be used, or the like. - The thickness (diameter) of the
wire 20 is not especially limited, as long as it is less than the thickness of the curedresin layer 5 between thedisplay part 2 and theprotective part 3. However, from the perspective of cutting performance, a suitable thickness of a wire can be in the range of 50 μm to 100 μm. - After the
display part 2 and theprotective part 3 have thus been separated, in step S7, the cured resin remaining on the surfaces of thedisplay part 2 and theprotective part 3 is wiped away by a removing solution containing an organic solvent (step S7). -
FIGS. 6( a) to (c) are explanatory diagrams schematically illustrating a method for wiping away a cured resin by an organic solvent. -
FIGS. 6( a) and 6(b) illustrate an embodiment where the resin composition on the display part (for example, LCD cell) or protective part (for example, plastic plate or glass plate) is cured by the irradiation of UV rays. - According to embodiments, as illustrated in
FIG. 6( c), an organic solvent-containing removing solution is coated by dropping or spraying, for example, onto the cured resin. The coated cured resin is then left for approximately 5 minutes at room temperature, for example, to impregnate the removing solution into the cured resin, which then swells. - The cured resin is then wiped away using a wipe member formed of an elastomer or the like which is impregnated with the same solvent as the organic solvent of the removing solution that was coated on the cured resin.
- As the organic solvent contained in the removing solution, an organic solvent which is compatible when mixed with the resin composition before curing in a 1:1 volume ratio, or more specifically, an organic solvent having a small solution parameter (SP value), can be used. In embodiments, an organic solvent having a solution parameter of less than 9 can be suitably used.
- In embodiments, by using a removing solution containing such an organic solvent, the cured resin remaining on the surfaces of the
display part 2 and theprotective part 3 can be completely removed. - For a liquid crystal display device, it is preferable to use an organic solvent which does not cause damage to the device, such as, for example, changes to the polarizing plate (made of triacetyl cellulose) provided on the
display part 2. - According to one embodiment, as organic solvents which satisfy the above requirements, suitable organic solvents include limonene (C10H16, solution parameter: 0.6) or toluene (C7H8, solution parameter: 8.8).
- In order to improve the wiping properties and volatility, ethyl alcohol or isopropyl alcohol may be added to the removing solution. From the perspective of improving safety, limonene is a suitable organic solvent.
- When a substrate formed of a polymer material (especially a PMMA substrate) is used as the
protective part 2, limonene may be used as the organic solvent, allowing the cured resin to be wiped away without causing any changes to the surface of the substrate. - Further, if the organic solvent is limonene, the wiping properties and volatility can be improved by adding ethyl alcohol and/or isopropyl alcohol.
- After the wiping step, the wiped surfaces of the
display part 2 and theprotective part 3 are examined to observe any changes in the appearance with, for example, in step S8. If there is no cured resin residue present and no changes on the surface have occurred, the process returns to step S1, and the above-described steps are repeated from the start in step S9. - Alternatively, if in step S9, there is a cured resin residue remaining on the surfaces of the
display part 2 and theprotective part 3, or if surface changes have occurred, the produced display device is treated as a defective product. - The present disclosure is not limited to the above-discussed embodiments, and various modifications can be made thereto.
- For example, in the above-discussed embodiment, the display device was moved against the wire when cutting the cured
resin layer 5. However, the present disclosure is not limited thereto and the wire may be moved against the display device. - In addition, the present disclosure is not limited to the above-discussed liquid crystal display device. For example, the present invention may also be applied to various flat panel display panels, such as an organic EL device.
- Embodiments will now be described in more detail using the following examples and comparative examples. However, the present invention is not limited to the following embodiments.
- A resin composition was prepared by kneading in a kneader 70 parts by weight of an ester compound formed from a maleic anhydride adduct of a polyisoprene polymer and 2-hydroxyethyl methacrylate, 30 parts by weight of dicyclopentenyl oxyethyl methacrylate, 10 parts by weight of 2-hydroxybutyl methacrylate, 30 parts by weight of a terpene series hydrogenated resin, 140 parts by weight of a butadiene polymer, 4 parts by weight of a photopolymerization initiator, and 0.5 parts by weight of a visible light region photopolymerization initiator.
- The resin composition prepared in the above-described blend was dropped onto a white glass plate having thickness of 100 μm, to be used as a protective part. The plate was transferred by a UV-conveyor in a UV-ray irradiation apparatus to cure the resin. The thickness of the cured resin was 100 μm.
- The transmittance of this cured resin was measured using a UV-Visible Spectrophotometer (V-560, JASCO Corporation) to be 90% or higher.
- Next, using a viscoelastometer (sold under the name “DMS6100”, manufactured by Seiko Instruments Inc.), the modulus of elasticity (
measurement frequency 1 Hz, 25° C.) of the cured resin was measured and the measured result was 1.0×104 Pa. - For the curing shrinkage ratio, specific gravities of the resin solution before curing, and the cured solid product were measured by an electronic densimeter (sold under the name “SD-120L”, manufactured by Mirage). The curing shrinkage ratio is calculated by the following equation based on the difference of the specific gravities between the resin solution before curing and the cured solid product. In the present example, curing shrinkage ratio was 1.8%.
-
Curing shrinkage ratio (%)=(Cured product specific gravity−Resin solution specific gravity)/Cured product specific gravity×100 - 2 mg of the above resin composition was dropped onto a glass plate for an LCD cell. The distortion (Ra: average surface roughness) in a predetermined region (2.93 mm×2.20 mm) of the glass plate surface due to the internal stress generated during the curing reaction by the UV irradiation was measured by a three-dimensional non-contact surface roughness meter (such as those manufactured by Zygo K.K.) and the measured result was 2.7 nm.
- In the present example, the cured resin had a modulus of elasticity of 1×104 Pa and a curing shrinkage ratio of 1.8%. Consequently, the average surface roughness Ra was 2.7 nm, and there was hardly any distortion, meaning that superior results were obtained. Therefore, a display device which is free from distortion can be obtained by arranging and filling such a cured resin between the display part and the protective part.
- As shown in
FIG. 6( a), the above-discussed resin composition was coated onto the above-described glass plate for a protective part or glass plate for an LCD cell. Then, as shown inFIG. 6( b), the resin composition was cured by irradiating with UV rays. - Next, as shown in
FIG. 6( c), limonene, toluene, or MEK was coated onto the cured resin as an organic solvent, and the coated cured resin was left for 5 minutes at room temperature. - Furthermore, by using a wipe member impregnated with the same organic solvent as that coated on the cured resin, the cured resin was wiped away.
- Subsequently, the wiping properties of each sample were confirmed using a microscope to observe any changes in the appearance of each sample. These results are shown in Table 1.
- In Table 1, samples which could be wiped without any resulting problems with their appearance are marked with a “circle”, while samples which had problems with their appearance are marked with a “cross”.
-
TABLE 1 Test results of wiping properties of cured resin Limonene Toluene MEK Grass plate ◯ ◯ X LCD cell ◯ ◯ X - As shown in Table 1, it is clear that when limonene or toluene was used as the organic solvent, the wiping could be carried out without problems in terms of appearance.
- On the other hand, when MEK was used as the organic solvent, the wiping could not be completely carried out. In addition, changes were seen in the polarizing plate on the glass plate for an LCD cell.
- <Cured Resin Physical Properties after Wiping Step in the Examples>
[Transmittance, Modulus of Elasticity, and Curing Shrinkage Ratio after Wiping Cured Resin] - The resin composition was dropped under the same conditions as the above-described Reference Example onto a glass plate for a protective part where the wiping step was finished. The resin composition was then cured under the same conditions.
- The transmittance of this cured resin was measured under the same conditions as the above-described Reference Example. The obtained result was equivalent (within the margin of error) to the result of the Reference Example.
- Next, the modulus of elasticity of this cured resin was measured under the same conditions as the above-described Reference Example. The obtained result was equivalent (within the margin of error) to the result of the Reference Example.
- In addition, the curing shrinkage ratio of this cured resin was measured and calculated under the same conditions as the above-described Reference Example. The obtained result was equivalent (within the margin of error) to the result of the Reference Example.
- [Measurement of Surface Roughness after Wiping Cured Resin]
- The resin composition was dropped under the same conditions as the above-described Reference Example onto a glass plate for an LCD cell of which the wiping step was finished. The distortion of the surface was measured under the same conditions as the above-described Reference Example. The measured average surface roughness Ra was equivalent (within the margin of error) to that of the Reference Example.
- Thus, in the present disclosure, none of the obtained results for the transmittance, modulus of elasticity, curing shrinkage ratio, and average surface roughness changed from before to after repair.
- Based on these results, according to the present disclosure, a repair operation can be carried out easily and reliably without damage to the bonded portion caused by the cured resin. It is thus understood that a display device without distortion can be obtained in a good yield.
- The resin composition of Reference Example was prepared by kneading in a kneader 50 parts by weight of polybutadiene acrylate, 20 parts by weight of hydroxyethyl methacrylate, 3 parts by weight of a photopolymerization initiator, and 1 part by weight of a visible light region photopolymerization initiator.
- The resin composition prepared in the above-described composition was dropped onto the above-described glass plate for a protective part, and cured under the same conditions as described above.
- The transmittance of this cured resin was measured under the same conditions as the above examples and the measured result was 90% or higher.
- Next, the modulus of elasticity of the cured resin was measured under the same conditions as the above examples and the measured result was 2.0×107 Pa.
- Furthermore, the curing shrinkage ratio was measured and calculated under the same conditions as the above examples and the calculated result was 5.6%.
- The resin composition was dropped under the same conditions as for the above-described examples onto a glass plate for an LCD cell. The distortion of the surface was measured under the same conditions as for the above examples and the measured result was 12.4 nm.
- In the present example, the cured resin had a modulus of elasticity of 2×107 Pa and a curing shrinkage ratio of 5.6%. Consequently, the average surface roughness Ra was 12.4 nm, and the level of distortion was greater than the roughness of the above examples.
- Furthermore, the above resin composition was coated onto the above-described glass plate for a protective part or glass plate for an LCD cell. Then, the resin composition was cured by irradiating with UV rays.
- Next, as an organic solvent, limonene or toluene was coated onto the cured resin and the coated cured resin was left to sit for 5 minutes at room temperature.
- Further, by using a wipe member impregnated with the same organic solvent as that coated on the cured resin, the cured resin was wiped away.
- Subsequently, the wiping properties of each sample were confirmed using a microscope to observe changes in appearance. It was observed that the cured resin was not able to be completely wiped away, and problems occurred in the appearance. Nevertheless, the produced samples were at a level which still allowed practical use.
- From the above results, it was confirmed that in the present disclosure it is advantageous for the modulus of elasticity of the cured resin not to exceed 1×105 Pa.
Claims (6)
1. A method for producing a display device, the display device comprising a display part for displaying an image and a light-transmitting protective part provided on the display part, a light-transmitting cured resin layer arranged between the display part and the protective part, the method comprising the steps of:
(a) coating a resin composition, the resin composition comprising a raw material of the cured resin, on at least one of the display part and the protective part,
(b) adhering the display part and the protective part with the resin composition interposed therebetween, and
(c) arranging a cured resin layer between the display part and the protective part by curing the resin composition by irradiating UV rays on an external side of the protective part, the cured resin layer having a storage elastic modulus of less than 1.0×105 Pa; and
wherein the following additional steps (d) to (0 are performed to remove defects present in the display device:
(d) separating the display part and the protective part by applying a slack wire having a smaller diameter than a thickness of the cured resin layer at a side face of the cured resin layer where the protective part and the display part are bonded, and moving the slack wire through the cured resin layer,
(e) peeling off and removing the cured resin adhered to the separated display part and the protective part by a removing solution comprising at least one organic solvent, and
(f) repeating the steps (a) to (c).
2. The method for producing a display device according to claim 1 , wherein the at least one organic solvent is compatible when mixed with the resin composition before curing in a 1:1 volume ratio.
3. The method for producing a display device according to claim 1 , wherein the removing solution comprises limonene or toluene as the at least one organic solvent.
4. The method for producing a display device according to claim 3 , wherein when the at least one organic solvent is limonene, the removing solution further comprises ethyl alcohol or isopropyl alcohol.
5. The method for producing a display device according to claim 1 , wherein the protective part is formed of a polymer material, and the removing solution comprises limonene as the at least one organic solvent.
6. The method for producing a display device according to claim 1 , wherein the display device is a liquid crystal display device in which a polarizing plate is provided on a surface of the display part.
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US13/332,922 US20120118483A1 (en) | 2007-07-17 | 2011-12-21 | Method for producing display device |
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JP2008105109A JP2009186962A (en) | 2007-07-17 | 2008-04-14 | Display device manufacturing method |
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PCT/JP2008/062855 WO2009011369A1 (en) | 2007-07-17 | 2008-07-16 | Display device manufacturing method |
US12/656,088 US8152947B2 (en) | 2007-07-17 | 2010-01-15 | Method for producing display device |
US13/332,922 US20120118483A1 (en) | 2007-07-17 | 2011-12-21 | Method for producing display device |
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EP (1) | EP2169456B1 (en) |
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Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
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US8815406B2 (en) | 2010-06-21 | 2014-08-26 | Sharp Kabushiki Kaisha | Display panel equipped with front plate, display device, and resin composition |
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Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
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US8815406B2 (en) | 2010-06-21 | 2014-08-26 | Sharp Kabushiki Kaisha | Display panel equipped with front plate, display device, and resin composition |
US8936839B2 (en) | 2011-01-18 | 2015-01-20 | Sharp Kabushiki Kaisha | Display panel with flat plate, method for manufacturing display panel with flat plate, and resin composition |
US10179445B2 (en) | 2011-10-21 | 2019-01-15 | Nippon Kayaku Kabushiki Kaisha | Method for producing optical member and use of ultraviolet ray cured resin composition for same |
US9562172B2 (en) | 2012-02-17 | 2017-02-07 | Three Bond Fine Chemical Co., Ltd. | Photocurable sheet-type adhesive composition for optical use |
US20150361256A1 (en) * | 2013-02-04 | 2015-12-17 | Bridgestone Corporation | Photocurable elastomer composition, gasket for hard disk drive, and hard disk drive |
US9982124B2 (en) * | 2013-02-04 | 2018-05-29 | Bridgestone Corporation | Photocurable elastomer composition, gasket for hard disk drive, and hard disk drive |
US9904098B2 (en) | 2013-05-13 | 2018-02-27 | Nitto Denko Corporation | Hard coat film, polarizing plate, and image display apparatus |
US9946104B2 (en) | 2015-12-28 | 2018-04-17 | Japan Display Inc. | Display device and method of manufacturing the same |
Also Published As
Publication number | Publication date |
---|---|
TWI440929B (en) | 2014-06-11 |
US8152947B2 (en) | 2012-04-10 |
JP2009186962A (en) | 2009-08-20 |
KR20160003302A (en) | 2016-01-08 |
KR20100037106A (en) | 2010-04-08 |
EP2169456A1 (en) | 2010-03-31 |
CN101743505A (en) | 2010-06-16 |
CN101743505B (en) | 2011-10-19 |
KR101721356B1 (en) | 2017-03-29 |
EP2169456A4 (en) | 2010-10-13 |
TW200916887A (en) | 2009-04-16 |
KR101581967B1 (en) | 2015-12-31 |
WO2009011369A1 (en) | 2009-01-22 |
HK1141865A1 (en) | 2010-11-19 |
EP2169456B1 (en) | 2016-12-14 |
US20100178834A1 (en) | 2010-07-15 |
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