CN115254562B - Buffer layer applied to flexible OLED screen bending and bonding and curing method thereof - Google Patents
Buffer layer applied to flexible OLED screen bending and bonding and curing method thereof Download PDFInfo
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- CN115254562B CN115254562B CN202210696322.9A CN202210696322A CN115254562B CN 115254562 B CN115254562 B CN 115254562B CN 202210696322 A CN202210696322 A CN 202210696322A CN 115254562 B CN115254562 B CN 115254562B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D1/00—Processes for applying liquids or other fluent materials
- B05D1/36—Successively applying liquids or other fluent materials, e.g. without intermediate treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
- B05D3/061—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation using U.V.
- B05D3/065—After-treatment
- B05D3/067—Curing or cross-linking the coating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/50—Multilayers
- B05D7/56—Three layers or more
- B05D7/58—No clear coat specified
- B05D7/582—No clear coat specified all layers being cured or baked together
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C53/00—Shaping by bending, folding, twisting, straightening or flattening; Apparatus therefor
- B29C53/02—Bending or folding
- B29C53/04—Bending or folding of plates or sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0073—Optical laminates
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2502/00—Acrylic polymers
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The invention discloses a buffer layer applied to bending and laminating of a flexible OLED screen and a curing method thereof, wherein the ultraviolet crosslinking buffer layer sequentially comprises a polyacrylic resin film layer, an isobornyl methacrylate film layer and a polyacrylic resin film layer from inside to outside. The curing method comprises the steps of forming a film: coating three thin film buffer layers on the bent inner surface of the flexible OLED screen exposed at the lower end of the adhesive plate; pre-curing: heating the flexible OLED screen which is not bent; bending: folding the part of the flexible OLED screen exposed at the lower end of the adhesive plate onto the supporting plate; formally curing: and after the part of the flexible OLED screen exposed at the lower end of the adhesive plate is folded on the supporting plate, performing formal curing by using two modes of heating curing and ultraviolet curing. The invention can effectively solve the problems of screen fracture and unstable adhesion caused by overlarge stress or uneven solidification in the bending process of the flexible OLED screen.
Description
Technical Field
The invention relates to an ultraviolet crosslinking buffer layer and a curing method thereof, in particular to an ultraviolet crosslinking buffer layer applied to bending and laminating of a flexible OLED (organic light emitting diode) screen and a curing method thereof, belonging to the technical field of adhesive materials.
Background
OLED (organic light emitting diode) has the advantages of self-luminescence, full solid state, wide viewing angle, thin thickness, quick response and the like, and has great application prospect in flat panel display. With rapid development of display technology, personal wear, folding screen mobile phones, 3D (three-dimensional) large-radian screen mobile phones and other electronic products, flexible OLED (organic light emitting diode) display devices are increasingly used. At present, in the bending process of a flexible OLED (organic light emitting diode) screen, the problems of screen fracture, infirm adhesion, OLED (organic light emitting diode) device damage and the like often occur due to overlarge stress or uneven solidification.
In order to solve the above-mentioned problems, it is necessary to develop an ultraviolet crosslinking buffer layer and a curing method thereof for flexible OLED (organic light emitting diode) panels.
Disclosure of Invention
The invention aims to solve the technical problem of providing an ultraviolet crosslinking buffer layer applied to bending and laminating of a flexible OLED screen and a curing method thereof, wherein the screen is not easy to break and is firmly bonded.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a buffer layer that is applied to flexible OLED screen laminating of buckling, the buffer layer is the ultraviolet cross-linking buffer layer, the ultraviolet cross-linking buffer layer is polyacrylic resin film layer two, methacrylic acid isobornyl ester film layer and polyacrylic acid resin film layer one from interior to outside in proper order.
The curing method of the buffer layer applied to bending and laminating of the flexible OLED screen is characterized by comprising the following steps of:
step one: forming a film, namely coating three film buffer layers on the bent inner surface of the lower end of the adhesive plate, wherein the three film buffer layers are a polyacrylic resin film layer II, an isobornyl methacrylate film layer and a polyacrylic resin film layer I in sequence from top to bottom, and an ultraviolet crosslinking layer is formed by the three film buffer layers;
step two: pre-curing, namely heating the ultraviolet crosslinking buffer layer of the flexible OLED screen which is not bent;
step three: bending, namely exposing the flexible OLED screen on the ultraviolet crosslinking layer part at the lower end of the adhesive plate, and folding the flexible OLED screen onto the supporting plate;
step four: and formally curing, namely exposing the ultraviolet crosslinking layer part of the flexible OLED screen at the lower end of the adhesive plate, folding the flexible OLED screen onto the supporting plate, and simultaneously performing formally curing by using two modes of heating curing and ultraviolet curing.
As a preferred embodiment of the invention, the curing method of the buffer layer applied to bending and laminating of the flexible OLED screen adopts a doctor blade method or a spin coating method, wherein the flexible substrate surface of the flexible OLED screen exposed at the lower end of the adhesive plate is coated with a polyacrylic resin film layer with the thickness of 30+/-10 mu m;
then preparing an isobornyl methacrylate film layer by adopting a doctor blade method or a spin coating method, and coating the isobornyl methacrylate film layer with the thickness of 30+/-10 mu m;
finally, a doctor blade method or a spin coating method is adopted to prepare the polyacrylic resin film layer, and the polyacrylic resin film layer with the thickness of 30+/-10 mu m is coated.
As a preferred embodiment of the present invention, the second specific step of the present invention is as follows: the flexible OLED screen which is not bent is heated for 1-3 minutes at the temperature of 40-60 ℃.
As a preferred embodiment of the present invention, the third specific steps of the present invention are as follows: and exposing the ultraviolet crosslinking layer part of the flexible OLED screen at the lower end of the adhesive plate by using the jig, folding the flexible OLED screen onto the supporting plate, and temporarily pressing the flexible OLED screen.
As a preferred embodiment of the present invention, the fourth specific steps of the present invention are as follows: the heating curing and the ultraviolet curing are carried out simultaneously, and the characteristic of the formal curing is that the temperature rise and fall period is slow, and the two periods are repeated.
As a preferred embodiment of the present invention, the fourth specific steps of the present invention are as follows: the heating curing and the ultraviolet curing are carried out simultaneously, and the formal curing is characterized in that the first period is matched with ultraviolet irradiation with 405nm wavelength.
As a preferred embodiment of the present invention, the fourth specific steps of the present invention are as follows: the heating curing and the ultraviolet curing are carried out simultaneously, and the third characteristic of formal curing is that ultraviolet light with the wavelength of 365nm is adopted for the second period.
Compared with the prior art, the invention has the following advantages and effects:
1. the invention provides a buffer layer structure of three alternating polyacrylic resin film layers and an isobornyl methacrylate film of an ultraviolet crosslinking material for folding a flexible OLED screen, which can ensure that the curvature is uniform and the stress is small in the bending process.
2. The invention provides a curing method of an ultraviolet crosslinking material for folding a flexible OLED screen, which can effectively solve the problems of screen fracture, unstable adhesion and the like caused by overlarge stress or uneven curing of the flexible OLED screen in the bending process.
Drawings
FIG. 1 is a flexible OLED screen of the present invention with three thin film buffer layers coated on the inner face;
FIG. 2 is a graph of the pre-cure temperature profile of the present invention;
FIG. 3 illustrates the simultaneous heating and ultraviolet curing in the final curing of the present invention;
FIG. 4 is a schematic illustration of a flexible OLED bending and bonding process according to the present invention;
fig. 5 is a prior art OLED basic structure of the present invention.
Detailed Description
The present invention will be described in further detail by way of examples, which are illustrative of the present invention and are not intended to limit the present invention thereto.
According to the ultraviolet crosslinking buffer layer for bending and laminating the OLED screen, as shown in fig. 1, the ultraviolet crosslinking buffer layer comprises a film forming: the flexible OLED (organic light emitting diode) screen is exposed at the bending inner surface of the lower end of the adhesive plate, three film buffer layers are coated, namely a polyacrylic resin film layer II 3, an isobornyl methacrylate film layer 2 and a polyacrylic resin film layer I1 are sequentially arranged from top to bottom, and a novel ultraviolet crosslinking layer is formed by the three film buffer layers, wherein the mechanism solidified from the ultraviolet crosslinking buffer layer in the figure 1 further comprises a flexible substrate 4, an ITO anode 5, an OLED organic functional layer 6 and a metal cathode 7.
The novel ultraviolet crosslinking layer is adhered to the bent inner surface of the flexible OLED screen, is composed of three alternating epoxy acrylic resin film layers and isobornyl methacrylate film layers, optimizes the thickness within the range of 90+/-30 um, ensures that the curvature is uniform when the flexible OLED screen is bent, and disperses bending stress.
In the prior art, OLEDs are mainly used for illumination and display. The basic structure is shown in fig. 5, and the general preparation method is to deposit one or more layers of organic thin films on an etched anode ITO (indium tin oxide) substrate, and then evaporate a metal cathode.
An alternative embodiment is to coat a polyacrylic resin film layer with the thickness of 30+/-10 um on the bent inner surface (flexible substrate surface) of the flexible OLED screen exposed at the lower end of the adhesive plate by a doctor blade method or a spin coating method; then the isobornyl methacrylate film layer is also prepared; finally, a polyacrylic resin film layer was also prepared.
The buffer layer structure of the three alternating polyacrylic resin film layers and the isobornyl methacrylate film can ensure that the curvature is uniform and the stress is small in the bending process.
In the prior art, the stress of an OLED (organic light emitting diode) screen is large during bending and curing, which results in damage to the OLED (organic light emitting diode) device.
The embodiment of the invention discloses a curing method of an ultraviolet crosslinking buffer layer for bending and laminating an OLED screen, which comprises the following steps:
step one: forming a film, namely coating three film buffer layers on the bent inner surface of the lower end of the adhesive plate, wherein the three film buffer layers are a polyacrylic resin film layer II, an isobornyl methacrylate film layer and a polyacrylic resin film layer I in sequence from top to bottom, and an ultraviolet crosslinking layer is formed by the three film buffer layers;
step two: pre-curing, namely heating the ultraviolet crosslinking buffer layer of the flexible OLED screen which is not bent;
step three: bending, namely exposing the flexible OLED screen on the ultraviolet crosslinking layer part at the lower end of the adhesive plate, and folding the flexible OLED screen onto the supporting plate;
step four: and formally curing, namely exposing the ultraviolet crosslinking layer part of the flexible OLED screen at the lower end of the adhesive plate, folding the flexible OLED screen onto the supporting plate, and simultaneously performing formally curing by using two modes of heating curing and ultraviolet curing.
In the prior art, as shown in fig. 4, a flexible OLED bending and bonding technology is as follows: the flexible OLED screen body is adhered to the supporting cover plate made of glass materials by adopting OCA (optically transparent adhesive), generally, a UV curing type OCA adhesive film is used, and the stress of the flexible OLED module in the bending process is overcome by means of the adhesiveness and cohesive force of the OCA adhesive film after curing. Disadvantages: in the bending process of the OLED module, when the bending radius is smaller, the stress of each thin film device is uneven, and the OCA adhesive flows in a viscous manner; in the bending process, the OLED screen is subjected to different pressures at different positions, so that the OCA adhesive has low adhesive strength and is easy to fall off; under the conditions of high temperature and high humidity, the OCA adhesive film and the flexible OLED screen are easy to generate interface separation or colloid cohesive failure.
In an alternative embodiment, as shown in fig. 2, the step two specifically includes: and heating the part of the ultraviolet cross-linked buffer layer of the flexible OLED screen which is not bent at 40-60 ℃ for 1-3 minutes.
The invention is pre-treated (heating for 1-3 min) before formal lamination, so that the buffer layer has better adhesiveness.
In the prior art, ultraviolet curing is generally carried out by direct lamination, and insufficient curing or infirm lamination and the like can occur.
In an alternative embodiment, the third specific steps are as follows: the flexible OLED screen is exposed on the ultraviolet crosslinking buffer layer at the lower end of the adhesive plate by using the jig, slowly and gently folded onto the supporting plate and temporarily pressed.
According to the invention, the fixture exposes the flexible OLED screen to the ultraviolet crosslinking buffer layer part at the lower end of the adhesive plate, and slowly and gently folds the flexible OLED screen onto the supporting plate, so that uneven stress of each thin film device is effectively prevented.
In an alternative embodiment, as shown in fig. 3, the step four is specifically: the heating curing and the ultraviolet curing are carried out simultaneously, and the formal curing is characterized in that the temperature rising and falling period is slowly carried out, and the steps are repeated twice; the first period is matched with ultraviolet irradiation with 405nm wavelength; the second cycle uses ultraviolet light with a wavelength of 365 nm.
The invention reduces the thermal stress in the OLED (organic light emitting diode) screen by a formal curing mode with special design.
In the prior art, the material is generally heated or ultraviolet cured under a single condition, the environment change is faster, the curing speed is faster, and the stress at the bending part is overlarge.
The foregoing description of the invention is merely exemplary of the invention. Various modifications or additions to the described embodiments may be made by those skilled in the art to which the invention pertains or in a similar manner, without departing from the spirit of the invention or beyond the scope of the invention as defined in the appended claims.
Claims (7)
1. Be applied to buffer layer that flexible OLED screen buckled laminating, its characterized in that: the buffer layer is an ultraviolet crosslinking buffer layer, and the ultraviolet crosslinking buffer layer is sequentially provided with a polyacrylic resin film layer II (3), an isobornyl methacrylate film layer (2) and a polyacrylic resin film layer I (1) from inside to outside;
the curing method of the buffer layer comprises the following steps:
step one: forming a film, namely coating three film buffer layers on the bent inner surface of the lower end of the adhesive plate, wherein the three film buffer layers are a polyacrylic resin film layer II, an isobornyl methacrylate film layer and a polyacrylic resin film layer I in sequence from top to bottom, and an ultraviolet crosslinking layer is formed by the three film buffer layers;
step two: pre-curing, namely heating the ultraviolet crosslinking buffer layer of the flexible OLED screen which is not bent;
step three: bending, namely exposing the flexible OLED screen on the ultraviolet crosslinking layer part at the lower end of the adhesive plate, and folding the flexible OLED screen onto the supporting plate;
step four: and formally curing, namely exposing the ultraviolet crosslinking layer part of the flexible OLED screen at the lower end of the adhesive plate, folding the flexible OLED screen onto the supporting plate, and simultaneously performing formally curing by using two modes of heating curing and ultraviolet curing.
2. The buffer layer for bending and attaching the flexible OLED screen according to claim 1, wherein the film forming in the first step adopts a doctor blade method or a spin coating method, and a polyacrylic resin film layer with the thickness of 30+/-10 mu m is coated on the flexible substrate surface of the flexible OLED screen exposed at the bending inner surface of the lower end of the adhesive plate;
then preparing an isobornyl methacrylate film layer by adopting a doctor blade method or a spin coating method, and coating the isobornyl methacrylate film layer with the thickness of 30+/-10 mu m;
finally, a doctor blade method or a spin coating method is adopted to prepare the polyacrylic resin film layer, and the polyacrylic resin film layer with the thickness of 30+/-10 mu m is coated.
3. The buffer layer applied to bending and attaching of the flexible OLED screen according to claim 1, wherein the second specific step is as follows: the flexible OLED screen which is not bent is heated for 1-3 minutes at the temperature of 40-60 ℃.
4. The buffer layer applied to bending and attaching of the flexible OLED screen according to claim 1, wherein the third specific steps are as follows: and exposing the ultraviolet crosslinking layer part of the flexible OLED screen at the lower end of the adhesive plate by using the jig, folding the flexible OLED screen onto the supporting plate, and temporarily pressing the flexible OLED screen.
5. The buffer layer applied to bending and attaching of the flexible OLED screen according to claim 1, wherein the fourth specific steps are as follows: the heating curing and the ultraviolet curing are carried out simultaneously, and the characteristic of the formal curing is that the temperature rise and fall period is slow, and the two periods are repeated.
6. The buffer layer for bending and attaching the flexible OLED screen according to claim 5, wherein the step four specifically includes: the heating curing and the ultraviolet curing are carried out simultaneously, and the formal curing is characterized in that the first period is matched with ultraviolet irradiation with 405nm wavelength.
7. The buffer layer for bending and attaching the flexible OLED screen according to claim 6, wherein the step four specifically includes: the heating curing and the ultraviolet curing are carried out simultaneously, and the third characteristic of formal curing is that ultraviolet light with the wavelength of 365nm is adopted for the second period.
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| CN202210696322.9A CN115254562B (en) | 2022-06-20 | 2022-06-20 | Buffer layer applied to flexible OLED screen bending and bonding and curing method thereof |
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| CN202210696322.9A CN115254562B (en) | 2022-06-20 | 2022-06-20 | Buffer layer applied to flexible OLED screen bending and bonding and curing method thereof |
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| CN115254562B true CN115254562B (en) | 2023-10-03 |
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