WO2014050933A1 - 表示装置の製造方法 - Google Patents
表示装置の製造方法 Download PDFInfo
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- WO2014050933A1 WO2014050933A1 PCT/JP2013/075992 JP2013075992W WO2014050933A1 WO 2014050933 A1 WO2014050933 A1 WO 2014050933A1 JP 2013075992 W JP2013075992 W JP 2013075992W WO 2014050933 A1 WO2014050933 A1 WO 2014050933A1
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- polyimide
- layer
- display device
- polyimide layer
- resin layer
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Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- 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
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
-
- 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
- G02F1/1303—Apparatus specially adapted to the manufacture of LCDs
-
- 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
-
- 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
- G02F1/133305—Flexible substrates, e.g. plastics, organic film
-
- 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
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/02—Details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/80—Manufacture or treatment specially adapted for the organic devices covered by this subclass using temporary substrates
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/40—Thermal treatment, e.g. annealing in the presence of a solvent vapour
- H10K71/441—Thermal treatment, e.g. annealing in the presence of a solvent vapour in the presence of solvent vapors, e.g. solvent vapour annealing
Definitions
- the present invention relates to a method for manufacturing a display device, and more particularly to a method for manufacturing a display device in which a display unit in a liquid crystal display device, an organic EL display device or the like is formed on a resin substrate.
- Display devices such as liquid crystal display devices and organic EL display devices are used for various displays such as large displays such as televisions and small displays such as mobile phones, personal computers and smartphones.
- an organic EL display device As a typical display device, there is an organic EL display device.
- a thin film transistor hereinafter referred to as TFT
- TFT thin film transistor
- Patent Document 1 relates to a polyimide useful as a plastic substrate for a flexible display and an invention relating to a precursor thereof, using tetracarboxylic acids containing an alicyclic structure such as cyclohexylphenyltetracarboxylic acid. It has been reported that polyimides reacted with various diamines are excellent in transparency. In addition to this, attempts have been made to reduce the weight by using a flexible resin for the support substrate. For example, in the following Non-Patent Documents 1 and 2, an organic material in which highly transparent polyimide is applied to the support substrate. An EL display device has been proposed.
- resin films such as polyimide are useful for plastic substrates for flexible displays, but the manufacturing process of display devices has already been performed using glass substrates, and most of the production facilities Is designed on the assumption that a glass substrate is used. Therefore, it is desirable to be able to produce display devices while effectively utilizing existing production equipment.
- a predetermined display device manufacturing process is completed in a state where a resin film is laminated on a glass substrate, and then the glass substrate is removed to provide a display unit on the resin base material.
- a display device manufacturing method is known (see Patent Document 2, Non-Patent Document 3, and Non-Patent Document 4). In these cases, it is necessary to separate the resin substrate and the glass without damaging the display unit (display unit) formed on the resin substrate.
- Non-Patent Document 3 after a predetermined display portion is formed on a resin base material applied and fixed on a glass substrate, laser is emitted from the glass side by a method called EPLaR (Electronics on Plastic by Laser Release) process.
- EPLaR Electros on Plastic by Laser Release
- this method not only requires an expensive laser device, but also has a disadvantage of low productivity because it takes time for separation.
- the surface properties of the resin substrate and the display unit mounted thereon may be adversely affected.
- the method described in Non-Patent Document 4 is a method in which the defects of the EPLaR method are improved, and after forming a release layer on a glass substrate, a polyimide resin is applied on the release layer to display an organic EL display.
- the polyimide film layer is peeled from the release layer after the manufacturing process of the device is completed.
- FIGS. 1 and 2 show a method for manufacturing an organic EL display device described in Non-Patent Document 4.
- Non-Patent Document 4 has no specific description such as what to use for the release layer. For this reason, it is unclear how much force is actually required for separation from the release layer and what state the surface properties of the separated polyimide layer 3 will be. Moreover, since it is necessary to make the area of a peeling layer smaller than the area of a polyimide layer, the area which can form an organic EL display device has a restriction
- a polyimide layer is made slightly larger than the release layer in the same manner as in Non-Patent Document 4.
- This is a method in which the polyimide layer is peeled off after forming and forming an electronic device thereon.
- an annealing process that generally reaches about 400 ° C. is necessary.
- the heat resistance of the release layer is inferior to that of polyimide.
- the maximum temperature at the time of preparation is restrict
- the adhesion between the glass and the release layer and between the release layer and the polyimide layer is weak, it cannot withstand the stress during the process and may cause peeling. Furthermore, the thermal expansion coefficient of the release layer is larger than that of polyimide, and the difference in thermal expansion coefficient due to the difference in resin type can be a factor of warpage.
- Patent Document 3 describes a method for manufacturing a semiconductor device in which a semiconductor element is formed on a support substrate via a release layer and then a semiconductor element is formed, and then the support substrate is released from the resin film.
- polybenzoxazole is disclosed as a resin film. In general, polybenzoxazole is excellent in peelability from other materials as compared with polyimide.
- the heat treatment time in contact with the adherend is preferably short, but in the case of polyimide benzoxazole, the heterocyclic ring and aromatic Since the ring has a coplanar structure, the crystallinity tends to be high, and a relatively long heat treatment time at high temperature is required to complete the reaction and sufficiently reduce the concentration of volatile components remaining in the film. .
- Patent Document 3 it is unclear how much force is required for separation from the release layer, but it is disclosed that the release layer and the resin film can be peeled by being immersed in warm water.
- the crystallinity is high, the film tends to be brittle. If an alicyclic structure, which is a flexible structure, is introduced to prevent this, there is a problem that heat resistance is lowered. Furthermore, the introduction of the alicyclic structure makes it difficult to reduce the thermal expansibility.
- Patent Documents 2 to 3 and Non-Patent Documents 3 to 4 all use a glass as a support, and form a display portion on a resin base material fixed to the glass.
- a glass substrate can be used as it is in a current production line for producing a display device such as a liquid crystal display device or an organic EL display device. Therefore, if it can be separated very easily after forming a predetermined display portion, and can be made not to affect the resin base material and the display portion, it can be a method with excellent mass productivity, The replacement from the glass substrate to the resin base material can be further promoted.
- an object of the present invention is to easily separate the resin base material from the support body after forming a predetermined display portion on the resin base material previously integrated with the support body, thereby simplifying the display device. It is to provide a method that can be obtained.
- the gist of the present invention is as follows.
- a display device manufacturing method comprising: obtaining a display device having a display unit on a resin base material made of a second resin layer by separating at a boundary surface.
- the laminated film in which the first resin layer and the second resin layer are directly laminated and the support are bonded to each other through the adhesive layer between the first resin layer surface of the laminated film and the one surface of the support. Later, a predetermined display portion was formed on the laminated film, and then separated at the boundary surface between the first resin layer and the second resin layer, and the display portion was provided on the resin base material composed of the second resin layer.
- a display device manufacturing method characterized in that a display device is obtained.
- R 1 to R 8 in the general formula (2) or the general formula (3) are each independently a hydrogen atom, a fluorine atom, an alkyl group or an alkoxy group having 1 to 5 carbon atoms, or a fluorine-substituted hydrocarbon.
- at least one of R 1 to R 4 and R 1 to R 8 in the general formula (3) is a fluorine atom or a fluorine-substituted group. It is a hydrocarbon group.
- the predetermined display portion can be formed while ensuring handling and dimensional stability. Can do. After the display portion is formed, the display device can be obtained very easily because it can be easily separated using the interface between the first resin layer and the second resin layer without requiring laser irradiation or the like. Can do.
- the support is reused in the manufacture of the display device because there is no influence on the second resin layer and the display portion which become the resin base material after separation, and the support is not damaged. It is also possible to make a significant contribution to manufacturing cost reduction.
- FIG. 1 is a schematic diagram for explaining a method of manufacturing an organic EL display device in the prior art.
- FIG. 2 is a schematic diagram for explaining a method of manufacturing an organic EL display device in the prior art.
- FIG. 3 is a schematic diagram for explaining a method for manufacturing a display device according to the present invention.
- FIG. 4 is a schematic diagram for explaining a method for manufacturing a display device according to the present invention.
- FIG. 5 is a schematic view (partially enlarged view) for explaining the method for manufacturing a display device according to the present invention.
- FIG. 6 is a schematic diagram for explaining a method for manufacturing a display device according to the present invention.
- FIG. 7 is a schematic diagram for explaining a method for manufacturing a display device according to the present invention.
- FIG. 8 is a schematic diagram for explaining a method for manufacturing a display device according to the present invention.
- FIG. 9 is a schematic diagram for explaining a method for manufacturing a display device according to the present invention.
- a predetermined display portion is formed on the second resin layer in a state where the first resin layer and the second resin layer are laminated on the support, and then the first resin is formed.
- a display device having a display portion on a resin substrate made of the second resin layer is obtained by separating at the boundary surface between the layer and the second resin layer. Details are as described below.
- at least one resin layer may be formed with resin other than a polyimide. Good.
- a substrate provided with a first polyimide layer and a second polyimide layer on a support in advance is used.
- a predetermined display part is formed in the 2nd polyimide layer side, and after that, it isolate
- the resin base material (polyimide base material) which consists of a 2nd polyimide layer It is possible to manufacture a display device having a display unit thereon.
- a support 1 serving as a pedestal is prepared in a manufacturing process of a display unit in a liquid crystal display device, an organic EL display device, or the like.
- the support 1 is not particularly limited as long as it has chemical strength and mechanical strength that can withstand heat history, atmosphere, and the like in the manufacturing process of the display unit forming various display devices.
- a substrate or a metal substrate is exemplified, but a glass substrate is preferably used.
- the support base material of the display unit is a polyimide base material composed of the second polyimide layer 8.
- the glass substrate here serves as a pedestal when forming the display part on the polyimide base material, and ensures the handling and dimensional stability of the polyimide base material in the manufacturing process of the display part. Even if it does, it will eventually be removed and will not constitute a display device.
- the support may be subjected to a surface treatment for controlling the peelability of the first polyimide layer 7 and the second polyimide layer 8.
- the first polyimide layer and the second polyimide layer are provided on the support 1, and as the method, 1) the first polyimide layer and the second polyimide layer are laminated in advance, A method of laminating and forming a laminated polyimide film on a support (lamination method), 2) forming a first polyimide layer and a second polyimide layer using polyimide or a polyimide precursor (hereinafter also referred to as “polyamic acid”).
- a method of applying a resin solution (application method), 3) A polyimide film is laminated on a support to form a first polyimide layer, and a second polyimide layer is formed of a polyimide or polyimide precursor resin solution Any method of performing by coating (combined method) may be used.
- the support 1 and the first polyimide layer may be directly adhered and laminated, or may be laminated via an adhesive layer as shown in FIG.
- any one of the first polyimide layer and the second polyimide layer may be formed so as to protrude from the peripheral portion of the other layer.
- the overhanging distance is not particularly limited, but is preferably not less than the total thickness of the first polyimide layer and the second polyimide layer, and more preferably not less than 10 times the total thickness.
- FIG. 3 shows a state in which a polyimide laminated film is attached to the support 1 with an adhesive layer 6 and a display portion is further laminated.
- the polyimide laminated film is composed of a first polyimide layer 7 and a second polyimide layer 8, and the first polyimide layer 7 and the second polyimide layer 8 have a structure in which direct stacking is performed in advance.
- a polyamic acid resin solution to be the second polyimide layer 8 is applied on the polyimide film to be the first polyimide layer 7, and then dried and imidized by heat treatment.
- a method (cast method).
- the adhesive layer 6 in addition to a resin adhesive such as an epoxy resin or an acrylic resin, an adhesive film provided with an adhesive layer on both surfaces of a support film can be used. Further, although the adhesive layer 6 is used in FIG. 3, as shown in FIG. 7, the first polyimide layer 7 side may be directly adhered to the support 1 by means such as thermocompression bonding.
- the thickness of the second polyimide layer 8 constituting the laminated film is preferably 3 ⁇ m or more and 50 ⁇ m or less. If the thickness of the second polyimide layer 8 is less than 3 ⁇ m, it will be difficult to ensure electrical insulation when the resin base material of the display device is formed and to prevent damage to the resin layer due to external factors. If it exceeds, the flexibility and transparency of the display device may decrease.
- the first polyimide layer 7 does not directly constitute a display device, and therefore it is preferable that the thickness is 10 ⁇ m or more in consideration of handling properties as a laminated film.
- the upper limit of the thickness is not particularly limited, but is preferably 100 ⁇ m or less in consideration of cost and the like.
- the polyimide laminated film is transferred to the subsequent process for forming the display portion in a state of being laminated and integrated on the support 1 with or without the adhesive layer 6.
- the process for forming the display portion refers to a process process of a predetermined TFT / organic EL process in the case of an organic EL display device, for example, and includes a TFT, an electrode, and a light emitting layer formed thereby.
- An organic EL element or the like corresponds to the display unit.
- an organic EL that performs color display by combining a white light emitting organic EL with a color filter has also been proposed.
- This color filter is manufactured separately from the TFT / organic EL process, and is then bonded to the TFT / organic EL side.
- This color filter also corresponds to the display unit.
- a liquid crystal display device it refers to a process process of a TFT process, and a TFT formed thereby, a drive circuit, and a color filter as necessary correspond to a display portion. That is, the process of forming the display unit includes various functional layers conventionally formed on a glass substrate including various display devices such as an electronic paper and a MEMS display in addition to an organic EL display device and a liquid crystal display device.
- the display unit 4 refers to a process of forming parts necessary for projecting a predetermined video (moving image or image), and the parts obtained thereby are collectively referred to as a display unit.
- the display unit 4 is laminated and formed on the second polyimide layer 8 side integrated with the first polyimide layer 7. And if all the display part lamination
- FIG. 4 shows the cutting process.
- the cutting step is not essential, and is optionally performed depending on the device to be manufactured and the mode of the step.
- the cutting is completely performed up to the display unit (TFT / organic EL panel unit) 4 and the second polyimide layer 8 along the cutting line 5 shown in FIG.
- the first resin is formed along the outer periphery of the display unit while allowing the cutting line 10 to reach the vicinity of the center of the first polyimide layer 7. If the layer is cut, the second polyimide layer 8 can be reliably and easily separated from the interface with the first polyimide layer 7 without causing mechanical damage to the TFT / organic EL panel portion 4. .
- the polyimide interface needs to be easily peeled off.
- the means is not specifically limited, it is mentioned that the polyimide which has a specific chemical structure is used for at least any one of a 1st or 2nd polyimide layer.
- a polyimide is usually obtained by polymerizing an acid anhydride and a diamine which are raw materials, and is represented by the following general formula (1).
- Ar 1 represents a tetravalent organic group that is an acid anhydride residue
- Ar 2 is a divalent organic group that is a diamine residue. From the viewpoint of heat resistance, Ar 1 and Ar 2 At least one is preferably an aromatic residue.
- fluorine-containing polyimide means one having a fluorine atom in the polyimide structure, and has a fluorine-containing group in at least one component of an acid anhydride and a diamine which are polyimide raw materials.
- a fluorine-containing polyimide for example, among those represented by the general formula (1), Ar 1 in the formula is a tetravalent organic group, and Ar 2 is represented by the following general formula (2) or (3 ) Represented by a divalent organic group represented by:
- R 1 to R 8 in the general formula (2) or the general formula (3) are each independently a hydrogen atom, a fluorine atom, an alkyl group or an alkoxy group having 1 to 5 carbon atoms, or a fluorine-substituted hydrocarbon group.
- at least one of R 1 to R 4 is a fluorine atom or a fluorine-substituted hydrocarbon group
- R 1 to R 8 At least one of them is a fluorine atom or a fluorine-substituted hydrocarbon group.
- R 1 to R 8 include —H, —CH 3 , —OCH 3 , —F, —CF 3, and the like. At least in Formula (2) or Formula (3), One substituent may be either —F or —CF 3 .
- Ar 1 in the general formula (1) when forming the fluorine-containing polyimide include, for example, the following tetravalent acid anhydride residues.
- the specific diamine residue that gives Ar 2 in the general formula (1) is preferably The following are mentioned.
- the polyimide is a polyimide according to the structure of the general formula (4) or (5)
- other polyimides that may be added at a ratio of less than 20 mol% at the maximum other than the polyimide are particularly limited.
- general acid anhydrides and diamines can be used.
- pyromellitic dianhydride, 3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride, 1,4-cyclohexanedicarboxylic acid, 1,2,3 are preferably used.
- 2,4-cyclobutanetetracarboxylic dianhydride 2,2′-bis (3,4-dicarboxyphenyl) hexafluoropropane dianhydride, and the like.
- diamines include 4,4'-diaminodiphenylsulfone, trans-1,4-diaminocyclohexane, 4,4'-diaminocyclohexylmethane, 2,2'-bis (4-aminocyclohexyl) -hexafluoro. Examples thereof include propane, 2,2′-bis (trifluoromethyl) -4,4′-diaminobicyclohexane, and the like.
- the polyamic acid resin solution uses substantially equimolar amounts of diamine and acid dianhydride as raw materials, and is organic. It can be obtained by reacting in a solvent. More specifically, it is obtained by dissolving diamine in an organic polar solvent such as N, N-dimethylacetamide under a nitrogen stream, adding tetracarboxylic dianhydride, and reacting at room temperature for about 5 hours. Can do.
- the weight average molecular weight of the obtained polyamic acid is preferably 10,000 to 300,000 from the viewpoint of uniform film thickness during coating and mechanical strength of the resulting polyimide film.
- the preferable molecular weight range of a polyimide layer is also the same molecular weight range as a polyamic acid.
- the second polyimide layer 8 is a polyimide having a structural unit represented by the general formula (4) or (5), so that the thermal expansion coefficient is 25 ppm / K or less, advantageously 10 ppm / It can be set as a polyimide layer of K or less, and is convenient as a polyimide base material for forming a display device.
- the polyimide which has these structural units shows the glass transition temperature (Tg) of 300 degreeC or more, and the transmittance
- At least one of the polyimide layers is preferably fluorinated so that they can be easily separated from each other at the interface between the first polyimide layer and the second polyimide layer using a predetermined polyimide. It is preferable to form it from polyimide.
- the adhesive strength at the interface between the first polyimide layer and the second polyimide layer is preferably 1 N / m or more and 500 N / m or less, more preferably 5 N / m.
- the present invention after 1) forming a predetermined display part, after the formation of the predetermined display part, 2) in addition to the method of separating at the interface between the first polyimide layer and the second polyimide layer, The support on the first polyimide layer side was removed, and then separated at the boundary surface between the remaining first polyimide layer and second polyimide layer, and a display unit was provided on the polyimide base material (second polyimide layer).
- a method for obtaining a display device is also included.
- the first polyimide layer 7 and the second polyimide layer 8 are separated from each other after the support 1 is removed.
- the shapes of the second polyimide layer 8 and the display unit 4 are kept constant during the separation.
- the first polyimide layer 7 is preferably separated while being fixed. Thereby, the stress concerning the display part 4 can be made small and even when the 2nd polyimide layer 8 is made thinner, the possibility of the damage of the device of the display part 4 can be reduced.
- the means for removing the support is not particularly limited as long as the display unit 4 and the second polyimide layer 8 are not damaged, but the method described later is used. be able to. That is, in the above description with reference to FIG. 3, an example in which the adhesive layer 6 is used has been shown. However, even in the lamination method, if the first polyimide layer 7 can be directly adhered to the support 1 by means such as thermocompression bonding, the adhesive layer 6 is not necessarily required as shown in FIG. In this case, the support 1 can be removed by the same method as described later.
- FIG. 6 shows a state in which the first polyimide layer 7 and the second polyimide layer 8 are sequentially formed on the support 1 by a coating method, and then the display unit 4 is further laminated.
- the support 1 is prepared, and a polyamic acid resin solution to be the first polyimide layer 7 is applied thereon, dried by heat treatment, and imidation is completed to form the first polyimide layer 7.
- a polyamic acid resin solution to be the second polyimide layer 8 is applied onto the first polyimide layer 7, dried by heat treatment, and imidization is completed to form the second polyimide layer 8.
- FIG. 6 shows a state in which the first polyimide layer 7, the second polyimide layer 8, and the display unit 4 are laminated on the support 1.
- the support 1 may be removed before the step of separation at the boundary surface between the first polyimide layer 7 and the second polyimide layer 8 from this state.
- a polyimide material that can be easily peeled off from the support 1 is used as the first polyimide layer 7, or a metal foil such as a copper foil or a metal substrate is used as the support 1, and these are removed with an etching solution.
- a method is exemplified.
- the support 1 may be removed by utilizing the laser irradiation in a nonpatent literature 3, or the peeling layer in a nonpatent literature 4.
- the first polyimide layer absorbs the laser, and adverse effects of the laser on the second polyimide layer and the display unit can be prevented.
- the first polyimide layer functions as a stress relaxation layer against the stress generated at the time of release, and prevents a decrease in yield due to damage to the display portion at the time of release. Can do.
- JP-T-2007-512568 a yellow film such as polyimide is formed on glass, and then a thin film electronic element is formed on the yellow film, and then the bottom surface of the yellow film is irradiated through the glass with UV laser light.
- the glass and the yellow film can be peeled off.
- a transparent plastic does not absorb UV laser light, so that an absorption / release layer such as amorphous silicon needs to be provided under the film in advance.
- JP 2012-511173 A discloses that a laser having a spectrum in the range of 300 to 410 nm needs to be used in order to peel glass and a polyimide film by irradiation with UV laser light. .
- the support when the support is removed from the first polyimide layer using laser light, it is preferable to use colored polyimide for the first polyimide layer.
- the first polyimide layer is a colored polyimide and the second polyimide layer is a transparent polyimide.
- a polyamic acid resin solution to be the first polyimide layer 7 is applied on the support 1 and heat-treated.
- the first polyimide layer should be imidized by sufficient heat treatment. This is preferable for easy separation of the two polyimide layers.
- the first polyimide layer and the second polyimide layer may be polyimide having the same chemical structure.
- both the first polyimide layer and the second polyimide layer are obtained by applying a resin solution and then drying or drying / curing after applying the resin solution. It is preferable that the heating time in the high temperature heating temperature range from the temperature 20 ° C. lower than the temperature (maximum temperature reached) to the maximum temperature (hereinafter referred to as the high temperature holding time) is as short as necessary characteristics can be obtained.
- the purpose of holding the first and / or second polyimide layer in the high temperature range in the coating method is to obtain the characteristics required for the original polyimide layer by completely removing the residual solvent and promoting the orientation of the polyimide resin. Because.
- the optimum high temperature holding time varies depending on the heating method, the polyimide thickness, and the type of polyimide, but is preferably 0.5 minutes or more and less than 60 minutes, and more preferably 0.5 minutes or more and less than 30 minutes.
- FIG. 8 shows a state in which a first polyimide layer 7 cut slightly smaller than the support 1 is pasted on the support 1 with an adhesive layer 6, and a second polyimide layer 8 and a display unit 4 are laminated thereon. It represents.
- the support 1 is prepared, and a polyimide film to be the first polyimide layer 7 is adhered thereon with the adhesive layer 6.
- the same method can be applied using the same polyimide film as the above-mentioned laminating method.
- a polyamic acid resin solution to be the second polyimide layer 8 is applied on the first polyimide layer 7 and dried by heat treatment to complete imidization, whereby the second polyimide layer 8 is obtained.
- the same method can be applied using the same resin solution as the coating method.
- a substrate in which the first polyimide layer 7 and the second polyimide layer 8 are sequentially formed on the support 1 can be obtained.
- it is used for the subsequent display portion forming step and subsequent steps. Since the steps after the display portion forming step are the same as described above, they are omitted.
- the first polyimide layer 7 and the support 1 are bonded together, and then the entire surface of the first polyimide layer 7 is covered with a polyamic acid resin solution that gives the second polyimide layer 8 in a varnish state. Apply.
- the applied polyamic acid resin solution is dried by heat treatment and imidized to form the second polyimide layer 8.
- At least a portion of the second polyimide layer 8 that is larger than the polyimide layer and not in contact with the first polyimide layer 7 is in contact with the support 1. That is, a part of the second polyimide layer 8 projects from the peripheral edge of the first polyimide layer 7 so that the projecting part of the second polyimide layer 8 is fixed to the support 1.
- the second polyimide layer 8 and the first polyimide layer 7 are configured to be easily peeled off.
- the second polyimide layer 8 and the support 1 are stronger by the overhanging portion of the second polyimide layer 8. Therefore, it is possible to increase the adhesion around the support and to secure more stability during the process.
- the cutting process as mentioned above, for example, as shown in FIG.
- the display part 4 and the 2nd polyimide along the cutting line 5 which cuts off the display part 4 If the layer 8 is cut and separated at the boundary surface between the first polyimide layer 7 and the second polyimide layer 8, a display device including the display unit 4 on the polyimide substrate made of the second polyimide layer 8 can be obtained. it can.
- the first polyimide layer is separated later, so it does not contribute to the function of the display device.
- the thermal expansion coefficient of the first polyimide layer is preferably 25 ppm / K or less.
- the glass transition temperature Tg is preferably 300 ° C. or higher.
- Specific examples of such a first polyimide layer include, for example, a polyimide having as a main component a structural unit composed of biphenyltetracarboxylic dianhydride and phenylenediamine.
- Upilex-S manufactured by Ube Industries, Ltd., Kapton manufactured by Toray DuPont Co., Ltd., and Toyobo Co., Ltd. can be used.
- oxygen, water vapor, or the like made of an inorganic oxide film such as silicon oxide, aluminum oxide, silicon carbide, silicon oxide carbide, silicon carbonitride, silicon nitride, or silicon nitride oxide
- a gas barrier layer having a barrier property against the above may be interposed.
- the difference in thermal expansion coefficient between the second polyimide layer and the gas barrier layer is 10 ppm / K or less.
- the first polyimide layer 7 is heat-treated to change the surface state of the first polyimide layer 7 to reduce the surface wettability, and then the second polyimide layer 8 is quickly applied.
- the method of using a film is mentioned.
- the appropriate temperature for this heat treatment varies depending on the type of the first polyimide layer 7, but when the first polyimide layer 7 is a polyimide film such as Kapton manufactured by Toray DuPont Co., Ltd. C. or lower is preferable.
- a laminate of the support and the first polyimide layer separated from the second polyimide layer may be reused by forming the second polyimide layer again on the first polyimide layer side.
- the laminate of the support and the first polyimide layer may be washed.
- the second polyimide layer may be applied after the laminate of the support and the first polyimide layer is heat-treated to reduce the wettability of the surface of the first polyimide layer.
- the second polyimide layer is separated, and the first polyimide layer side of the laminate of the support and the first polyimide layer is again, A method of forming one polyimide layer and then forming a second polyimide layer is also possible.
- the support removed from the first polyimide layer may be reused.
- the support Prior to reuse, the support may be cleaned, heat-treated, or surface-treated.
- Glass transition temperature (Tg) The glass transition temperature was measured at a rate of 10 ° C./min from room temperature to 400 ° C. while applying a vibration of 1 Hz using a 10 mm width sample using a viscoelasticity analyzer (RSA-II manufactured by Rheometric Science Effy Co., Ltd.). It was determined from the maximum loss tangent (Tan ⁇ ) when the temperature was raised at.
- CTE Coefficient of thermal expansion
- Example 1 Curing a polyamic acid resin solution obtained from PDA (1,4-phenylenediamine) and BPDA (3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride) on a glass substrate as a support
- the coating was applied so that the subsequent thickness was 20 ⁇ m and a coating area of 300 mm ⁇ 380 mm, and the solvent (DMAc: N, N-dimethylacetamide) in the resin solution was dried by heating at 130 ° C. for removal.
- DMAc N, N-dimethylacetamide
- the film was imidized by heat treatment from 160 ° C. to 360 ° C. at a rate of temperature increase of about 20 ° C./min to form a second polyimide layer having a thickness of 25 ⁇ m.
- the high temperature holding time at this time was 1 minute.
- the diamine component and the acid dianhydride component were approximately equimolar, and the PMDA / 6FDA ratio was 85/15.
- the peel strength between the first polyimide layer and the second polyimide layer was 3.5 N / m.
- the linear expansion coefficient of the 1st polyimide layer was 12.0 ppm / K
- the linear expansion coefficient of the 2nd polyimide layer was 9.7 ppm / K.
- the transmittance of the second polyimide layer in the wavelength region of 440 nm to 780 nm was 83.5%.
- the diamine component and the acid dianhydride component were approximately equimolar, and the PMDA / 6FDA ratio was 60/40.
- a laminated body in which the first and second polyimide layers were sequentially laminated on the glass was formed, and an EL element serving as a display unit was formed on the second polyimide layer side of the laminated body. Then, the first polyimide layer and the second polyimide layer are cut off in the thickness direction of the first polyimide layer and the second polyimide layer so as to surround the display portion, and the glass on the first polyimide layer side is peeled off and removed.
- a display device having an EL element on a polyimide base material composed of a second polyimide layer was obtained by peeling at the interface with the layer.
- the peel strength between the first polyimide layer and the second polyimide layer was 4.0 N / m.
- the linear expansion coefficient of the first polyimide layer was 7.0 ppm / K
- the linear expansion coefficient of the second polyimide layer was 20.4 ppm / K.
- the transmittance of the second polyimide layer in the wavelength region of 440 nm to 780 nm was 86.7%.
- Example 3 In order to reuse the laminate of the support and the first polyimide layer separated and separated from the second polyimide layer in Example 1, after removing the remaining peripheral portion of the second polyimide layer, it was washed with pure water, Further, heat treatment was performed for two minutes at each temperature of 100 ° C., 200 ° C., 300 ° C., and 360 ° C.
- the polyamic acid resin solution was applied in the same manner as the second polyimide layer of Example 1, and heat-dried at 130 ° C., and then about 20 ° C./min from 160 ° C. to 360 ° C. The temperature was raised at a rate and held at 360 ° C. for 60 minutes to form a second polyimide layer having a thickness of 25 ⁇ m. The high temperature holding time at this time was 61 minutes.
- a laminate was obtained by sequentially laminating the first polyimide layer and the second polyimide layer on the glass, and a display device was obtained in the same procedure as in Example 1.
- the peel strength between the first polyimide layer and the second polyimide layer was 10.0 N / m and could be easily separated manually.
- the linear expansion coefficient of the second polyimide layer was 9.3 ppm / K, and the transmittance of the second polyimide layer in the wavelength region of 440 nm to 780 nm was 78.5%.
- Example 4 On a glass substrate as a support, 17.70 g of m-TB (2,2′-dimethylbenzidine), 4.3 g of TPE-R (1,3-bis (4-aminophenoxy) benzene and PMDA (Pyromerit Acid dianhydride) 17.20 g and BPDA (3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride) 5.8 g, the cured polyamic acid resin solution had a thickness of 25 ⁇ m, 310 mm The coating area was 390 mm, and the solvent (DMAc: N, N-dimethylacetamide) in the resin solution was removed by heating and drying at 120 ° C. Next, from about 130 ° C.
- DMAc N, N-dimethylacetamide
- the polyamic acid resin solution is apply
- the high temperature holding time at this time was 31 minutes.
- Example 2 a laminated body in which the first polyimide layer and the second polyimide layer were sequentially laminated on the glass was obtained, and a display device was obtained in the same procedure as in Example 2.
- the peel strength between the first polyimide layer and the second polyimide layer was 110 N / m, and could be separated manually.
- the linear expansion coefficient of the first polyimide layer was 20.0 ppm / K, and the linear expansion coefficient of the second polyimide layer was 9.5 ppm / K.
- the transmittance of the second polyimide layer in the wavelength region of 440 nm to 780 nm was 80.5%.
- Example 5 Polyamide acid resin solution obtained from PDA (1,4-phenylenediamine) and BPDA (3,3 ′, 4,4′-biphenyltetracarboxylic dianhydride) on a copper foil has a thickness after curing of 20 ⁇ m.
- the solvent (DMAc: N, N-dimethylacetamide) in the resin solution was removed by heating and drying at 130 ° C.
- the diamine component and the acid dianhydride component were approximately equimolar, and the PMDA / 6FDA ratio was 85/15.
- the copper foil portion of the laminate composed of this copper foil / first polyimide layer / second polyimide layer was removed by ferric chloride etching to obtain a laminated film composed of the first polyimide layer / second polyimide layer.
- This laminated film was bonded to a glass substrate as a support with an epoxy resin adhesive, and then an EL element as a display portion was formed on the second polyimide layer side. Then, the interface of a 1st polyimide layer and a 2nd polyimide layer was isolate
- the first polyimide layer and the second polyimide layer could be easily separated without damaging the display device such as TFT and electrode.
- the linear expansion coefficient of the 1st polyimide layer was 12.0 ppm / K
- the linear expansion coefficient of the 2nd polyimide layer was 9.7 ppm / K.
- the transmittance of the second polyimide layer in the wavelength region of 440 nm to 780 nm was 83.5%.
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Abstract
Description
すなわち、本発明の要旨は次のとおりである。
(2)第一樹脂層と第二樹脂層とが直接積層された積層フィルムと支持体とを、前記積層フィルムの第一樹脂層面と前記支持体の一面とを接着層を介して貼り合わせた後に、積層フィルム上に所定の表示部を形成し、その後、第一樹脂層と第二樹脂層との境界面で分離して、第二樹脂層からなる樹脂基材上に表示部を備えた表示装置を得ることを特徴とする、(1)に記載の表示装置の製造方法。
(3)積層フィルムを構成する第一樹脂層及び第二樹脂層が、それぞれポリイミドからなる、(2)に記載の表示装置の製造方法。
(4)支持体上に第一ポリイミド層及び第二ポリイミド層を形成した後に、更に所定の表示部を形成し、その後、第一ポリイミド層と第二ポリイミド層との境界面で分離して、第二ポリイミド層からなるポリイミド基材上に表示部を備えた表示装置を得ることを特徴とする、(1)に記載の表示装置の製造方法。
(5)所定の表示部を形成した後、支持体を除去した上で、第一ポリイミド層と第二ポリイミド層との境界面で分離して、ポリイミド基材上に表示部を備えた表示装置を得る、(4)に記載の表示装置の製造方法。
(6)第一ポリイミド層の形成をポリイミドフィルムの積層により行ない、第二ポリイミド層の形成をポリイミド又はポリイミド前駆体の樹脂溶液の塗布により行なう、(4)又は(5)に記載の表示装置の製造方法。
(7)第一ポリイミド層及び第二ポリイミド層の形成を、ポリイミド又はポリイミド前駆体の樹脂溶液を塗布・加熱することによって行なう、(4)又は(5)に記載の表示装置の製造方法。
(8)第二ポリイミド層の一部が第一ポリイミド層の周縁部より張り出すようにし、この第二ポリイミド層の張出部が支持体に固着されるようにする、(4)~(7)のいずれかに記載の表示装置の製造方法。
(9)第一ポリイミド層、又は第二ポリイミド層の片方の層の一部が、他の層の周縁部より張り出すようにする、(4)~(7)のいずれかに記載の表示装置の製造方法。
(10)表示部の外周に沿って第一樹脂層に切れ目を入れた後、第一樹脂層と第二樹脂層との分離を行なう、(4)~(9)のいずれかに記載の表示装置の製造方法。
(11)第二ポリイミド層の形成をポリイミド又はポリイミド前駆体の樹脂溶液を塗布したのち加熱することで行う際に、第二ポリイミド層の高温保持時間が60分未満である、(6)又は(7)に記載の表示装置の製造方法。
(12)支持体がガラス基板である、(1)~(11)のいずれかに記載の表示装置の製造方法。
(13)第一樹脂層の熱膨張係数が25ppm/K以下である、(1)~(12)のいずれかに記載の表示装置の製造方法。
(14)第二樹脂層の熱膨張係数が25ppm/K以下である、(1)~(13)のいずれかに記載の表示装置の製造方法。
(15)第二樹脂層は、440nmから780nmの波長領域での透過率が80%以上である、(1)~(14)のいずれかに記載の表示装置の製造方法。
(16)表示部がガスバリア層を介して形成され、第二樹脂層とガスバリア層との熱膨張係数の差が10ppm/K以下である、(1)~(15)のいずれかに記載の表示装置の製造方法。
(17)表示部がカラーフィルター層である、(1)~(16)のいずれかに記載の表示装置の製造方法。
(18)第一樹脂層と第二樹脂層との剥離強度が200N/m以下である、(1)~(17)のいずれか記載の表示装置の製造方法。
(19)第一樹脂層、又は第二樹脂層の少なくとも一方が、下記一般式(1)で表される構造単位を有するポリイミドからなる、(1)~(18)のいずれかに記載の表示装置の製造方法。
[式中、Ar1は芳香環を有する4価の有機基を表し、Ar2は下記一般式(2)又は(3)で表される2価の有機基である。
〔ここで、一般式(2)又は一般式(3)におけるR1~R8は、互いに独立に水素原子、フッ素原子、炭素数1~5までのアルキル基若しくはアルコキシ基、又はフッ素置換炭化水素基であり、一般式(2)にあってはR1~R4のうち、また、一般式(3)にあってはR1~R8のうち、それぞれ少なくとも一つはフッ素原子又はフッ素置換炭化水素基である。〕]
<ラミネート法>
図3は、支持体1上にポリイミド積層フィルムを接着層6で貼り付け、更に表示部を積層した状態を表したものである。ここで、ポリイミド積層フィルムは、第一ポリイミド層7と第二ポリイミド層8とからなり、第一ポリイミド層7と第二ポリイミド層8とは、予め、直積積層された構造となっている。このようなポリイミド積層フィルムを得るには、例えば、第一ポリイミド層7となるポリイミドフィルム上に、第二ポリイミド層8となるポリアミド酸の樹脂溶液を塗布し、その後、熱処理により乾燥、イミド化する方法(キャスト法)が挙げられる。なお、接着層6としては、エポキシ樹脂やアクリル樹脂等の樹脂系接着剤のほか、支持フィルムの両面に粘着層を設けた粘着フィルム等を用いることができる。また、この図3では接着層6を用いているが、図7に示したように、加熱圧着等の手段により、直接第一ポリイミド層7側を支持体1に接着させるようにしてもよい。
式中、Ar1は酸無水物残基である4価の有機基を表し、Ar2はジアミン残基である2価の有機基であるが、耐熱性の観点から、Ar1、Ar2の少なくとも一方は、芳香族残基であることが好ましい。
特に好ましくは、下記繰り返し構造単位を有するポリイミドである。
<塗布法>
図6は、支持体1上に第一ポリイミド層7、第二ポリイミド層8を順次塗布法で形成し、その後、更に表示部4を積層した状態を表したものである。この方法においては、先ず、支持体1を準備し、その上に第一ポリイミド層7となるポリアミド酸の樹脂溶液を塗布、熱処理により乾燥、イミド化を完了させ、第一ポリイミド層7とする。次いで、上記第一ポリイミド層7上に、第二ポリイミド層8となるポリアミド酸の樹脂溶液を塗布、熱処理により乾燥、イミド化を完了させ、第二ポリイミド層8とする。このようにして、支持体1上に第一ポリイミド層7、第二ポリイミド層8が順次形成された基板とすることができる。そして、その後、続く表示部形成工程以降の工程に供される。表示部形成工程以降の工程は上記ラミネート法と同様であることから詳細については省略し、上述した2)の方法における支持体1の除去に関し、以下で簡単に説明する。
<併用法>
図8は、支持体1上に、支持体1よりも一回り小さくカットした第一ポリイミド層7を接着層6で貼り付け、その上に第二ポリイミド層8、及び表示部4を積層した状態を表したものである。
この方法においては、先ず、支持体1を準備し、その上に第一ポリイミド層7となるポリイミドフィルムを接着層6で貼り付ける。この点においては、上記ラミネート法と同じポリイミドフィルムを使用し、同じ方法を適用できる。
〔透過率(%)〕
ポリイミドフィルム(50mm×50mm)をU4000形分光光度計にて、440nmから780nmにおける光透過率の平均値を求めた。
ガラス転移温度は、粘弾性アナライザ(レオメトリックサイエンスエフィー株式会社製RSA-II)を使って、10mm幅のサンプルを用いて、1Hzの振動を与えながら、室温から400℃まで10℃/分の速度で昇温した際の、損失正接(Tanδ)の極大から求めた。
3mm×15mmのサイズのポリイミドフィルムを、熱機械分析(TMA)装置にて5.0gの荷重を加えながら一定の昇温速度(20℃/min)で30℃から260℃の温度範囲で引張り試験を行い、温度に対するポリイミドフィルムの伸び量から熱膨張係数(×10-6/K)を測定した。
支持体であるガラス基材上にPDA(1,4-フェニレンジアミン)とBPDA(3,3',4,4'-ビフェニルテトラカルボン酸二無水物)から得られたポリアミド酸の樹脂溶液を硬化後の厚みが20μm、300mm×380mmの塗布面積となるように塗布し、樹脂溶液中の溶剤(DMAc:N,N-ジメチルアセトアミド)を130℃で加熱乾燥し除去した。次に、160℃から360℃まで約1℃/分の昇温速度で熱処理することでイミド化し、厚み20μmの第一ポリイミド層(表面粗さRa=1.3nm、Tg=355℃)を形成した。
支持体であるガラス基材上にPDA(1,4-フェニレンジアミン)とBPDA(3,3’,4,4’-ビフェニルテトラカルボン酸二無水物)から得られたポリアミド酸の樹脂溶液を硬化後の厚みが20μm、310mm×390mmの塗布面積となるように塗布し、樹脂溶液中の溶剤(DMAc:N,N-ジメチルアセトアミド)を120℃で加熱乾燥し除去した。次に、130℃から360℃まで約1℃/分の昇温速度で熱処理することでイミド化し、厚み25μmの第一ポリイミド層(表面粗さRa=1.3nm、Tg=355℃)を形成した。
実施例1で第二ポリイミド層から剥離分離された、支持体と第一ポリイミド層の積層体を再利用するため、残留する第二ポリイミド層の周辺部を取り除いた後、純水で洗浄し、さらに100℃、200℃、300℃、360℃の各温度で、それぞれ二分の熱処理を行った。
支持体であるガラス基材上に、m-TB(2,2’-ジメチルベンジジン)17.70g、TPE-R(1,3-ビス(4-アミノフェノキシ)ベンゼン4.3gとPMDA(ピロメリット酸ニ無水物)17.20g、BPDA(3,3’,4,4’-ビフェニルテトラカルボン酸二無水物)5.8gから得られたポリアミド酸の樹脂溶液を硬化後の厚みが25μm、310mm×390mmの塗布面積となるように塗布し、樹脂溶液中の溶剤(DMAc:N,N-ジメチルアセトアミド)を120℃で加熱乾燥し除去した。次に、130℃から160℃まで約15℃/分の昇温速度で熱処理することでイミド化し、厚み25μmの第一ポリイミド層(表面粗さRa=1.0nm、Tg=360℃)を形成した。
銅箔上にPDA(1,4-フェニレンジアミン)とBPDA(3,3’,4,4’-ビフェニルテトラカルボン酸二無水物)から得られたポリアミド酸の樹脂溶液を硬化後の厚みが20μmとなるように塗布し、樹脂溶液中の溶剤(DMAc:N,N-ジメチルアセトアミド)を130℃で加熱乾燥し除去した。次に、160℃から360℃まで約1℃/分の昇温速度で熱処理することでイミド化し、厚み20μmの第一ポリイミド層(表面粗さRa=1.3nm、Tg=355℃)を銅箔上に形成した。
2 剥離層
3 ポリイミド層
4 表示部(TFT/有機ELパネル部)
5 切断線
6 接着層
7 第一ポリイミド層
8 第二ポリイミド層
9 切断領域
10 切断面
Claims (19)
- 第一樹脂層と第二樹脂層とが支持体上に積層された状態で、第二樹脂層上に所定の表示部を形成し、その後、第一樹脂層と第二樹脂層との境界面で分離して、第二樹脂層からなる樹脂基材上に表示部を備えた表示装置を得ることを特徴とする表示装置の製造方法。
- 第一樹脂層と第二樹脂層とが直接積層された積層フィルムと支持体とを、前記積層フィルムの第一樹脂層面と前記支持体の一面とを接着層を介して貼り合わせた後に、積層フィルム上に所定の表示部を形成し、その後、第一樹脂層と第二樹脂層との境界面で分離して、第二樹脂層からなる樹脂基材上に表示部を備えた表示装置を得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。
- 積層フィルムを構成する第一樹脂層及び第二樹脂層が、それぞれポリイミドからなる、請求項2に記載の表示装置の製造方法。
- 支持体上に第一ポリイミド層及び第二ポリイミド層を形成した後に、更に所定の表示部を形成し、その後、第一ポリイミド層と第二ポリイミド層との境界面で分離して、第二ポリイミド層からなるポリイミド基材上に表示部を備えた表示装置を得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。
- 所定の表示部を形成した後、支持体を除去した上で、第一ポリイミド層と第二ポリイミド層との境界面で分離して、ポリイミド基材上に表示部を備えた表示装置を得る、請求項4に記載の表示装置の製造方法。
- 第一ポリイミド層の形成をポリイミドフィルムの積層により行ない、第二ポリイミド層の形成をポリイミド又はポリイミド前駆体の樹脂溶液の塗布により行なう、請求項4又は5に記載の表示装置の製造方法。
- 第一ポリイミド層及び第二ポリイミド層の形成を、ポリイミド又はポリイミド前駆体の樹脂溶液を塗布・加熱することによって行なう、請求項4又は5に記載の表示装置の製造方法。
- 第二ポリイミド層の一部が第一ポリイミド層の周縁部より張り出すようにし、この第二ポリイミド層の張出部が支持体に固着されるようにする、請求項4~7のいずれかに記載の表示装置の製造方法。
- 第一ポリイミド層、又は第二ポリイミド層の片方の層の一部が、他の層の周縁部より張り出すようにする、請求項4~7のいずれかに記載の表示装置の製造方法。
- 表示部の外周に沿って第一樹脂層に切れ目を入れた後、第一樹脂層と第二樹脂層との分離を行なう、請求項4~9のいずれかに記載の表示装置の製造方法。
- 第二ポリイミド層の形成をポリイミド又はポリイミド前駆体の樹脂溶液を塗布したのち加熱することで行う際に、第二ポリイミド層の高温保持時間が60分未満である、請求項6又は7に記載の表示装置の製造方法。
- 支持体がガラス基板である、請求項1~11のいずれかに記載の表示装置の製造方法。
- 第一樹脂層の熱膨張係数が25ppm/K以下である、請求項1~12のいずれかに記載の表示装置の製造方法。
- 第二樹脂層の熱膨張係数が25ppm/K以下である、請求項1~13のいずれかに記載の表示装置の製造方法。
- 第二樹脂層は、440nmから780nmの波長領域での透過率が80%以上である、請求項1~14のいずれかに記載の表示装置の製造方法。
- 表示部がガスバリア層を介して形成され、第二樹脂層とガスバリア層との熱膨張係数の差が10ppm/K以下である、請求項1~15のいずれかに記載の表示装置の製造方法。
- 表示部がカラーフィルター層である、請求項1~16のいずれかに記載の表示装置の製造方法。
- 第一樹脂層と第二樹脂層との剥離強度が200N/m以下である、請求項1~17のいずれか記載の表示装置の製造方法。
- 第一樹脂層、又は第二樹脂層の少なくとも一方が、下記一般式(1)で表される構造単位を有するポリイミドからなる、請求項1~18のいずれかに記載の表示装置の製造方法。
[式中、Ar1は芳香環を有する4価の有機基を表し、Ar2は下記一般式(2)又は(3)で表される2価の有機基である。
〔ここで、一般式(2)又は一般式(3)におけるR1~R8は、互いに独立に水素原子、フッ素原子、炭素数1~5までのアルキル基若しくはアルコキシ基、又はフッ素置換炭化水素基であり、一般式(2)にあってはR1~R4のうち、また、一般式(3)にあってはR1~R8のうち、それぞれ少なくとも一つはフッ素原子又はフッ素置換炭化水素基である。〕]
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JP2015522451A (ja) * | 2013-04-09 | 2015-08-06 | エルジー・ケム・リミテッド | 積層体、積層体の製造方法、素子用基板の製造方法、素子の製造方法、素子及びポリイミド系フィルム |
KR20160077554A (ko) * | 2014-12-23 | 2016-07-04 | 엘지디스플레이 주식회사 | 플렉서블 표시장치의 제조 방법 및 플렉서블 표시장치 |
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JP7265560B2 (ja) | 2018-11-01 | 2023-04-26 | 株式会社カネカ | 積層体およびその製造方法、ならびにプリント配線板の製造方法 |
TWI840435B (zh) * | 2018-11-01 | 2024-05-01 | 日商鐘化股份有限公司 | 積層體及其製造方法、與印刷佈線板之製造方法 |
JP2021082559A (ja) * | 2019-11-22 | 2021-05-27 | エルジー・ケム・リミテッド | 表示装置用支持基板、有機el表示装置、および有機el表示装置の製造方法 |
JP7398934B2 (ja) | 2019-11-22 | 2023-12-15 | エルジー・ケム・リミテッド | 表示装置用支持基板、有機el表示装置、および有機el表示装置の製造方法 |
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TW201938368A (zh) | 2019-10-01 |
CN107728358B (zh) | 2021-01-12 |
KR20150060716A (ko) | 2015-06-03 |
JP6284562B2 (ja) | 2018-02-28 |
KR102094729B1 (ko) | 2020-03-30 |
TWI718484B (zh) | 2021-02-11 |
TWI664087B (zh) | 2019-07-01 |
TW201425048A (zh) | 2014-07-01 |
CN104685553B (zh) | 2017-10-24 |
CN107728358A (zh) | 2018-02-23 |
KR102087647B1 (ko) | 2020-03-11 |
JPWO2014050933A1 (ja) | 2016-08-22 |
CN104685553A (zh) | 2015-06-03 |
JP5898328B6 (ja) | 2018-06-27 |
KR20200026322A (ko) | 2020-03-10 |
JP2016145987A (ja) | 2016-08-12 |
JP5898328B2 (ja) | 2016-04-06 |
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