A flexible AMOLED display screen, crack repair method thereof, and flexible display device

Abstract

The present invention provides a flexible AMOLED display screen, a crack repairing method thereof and a flexible display device. The flexible AMOLED display screen comprises, from bottom to top, a flexible driving backplane layer, an organic light-emitting layer, a touch layer, a polarizing plate layer and a self-repairing layer. The flexible AMOLED display screen of the present invention has good flexibility and self-repairing ability, and can self-repair internal or external cracks generated during its use, thereby extending the service life of the display screen and the display device, and has broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible display devices, and relates to a flexible AMOLED display screen, a crack repairing method thereof, and a flexible display device. Background Art

[0002] At present, the bottleneck of flexible / foldable display products lies not only in the device structure itself, but also in the flexible protective cover, which is also one of the important factors restricting its development. The flexible protective cover must be repeatedly bendable, transparent, ultra-thin and sufficiently hard. It is not easy to find a material with all these characteristics.

[0003] In order to meet the material requirements of flexible screens, hard coating materials have been proposed. Manufacturers apply hard coatings on organic polymer materials to increase their surface hardness. Hard coatings are used in flexible displays. They must meet the high light transmittance and surface hardness of glass, as well as the flexibility and wear resistance required by flexible materials.

[0004] CN104269499 A discloses an AMOLED structure and a manufacturing method thereof, wherein the AMOLED structure comprises an AMOLED display module, a polarizer, and a cover glass, wherein the polarizer is bonded between the AMOLED display module and the cover glass, and the polarizer is provided with a printed pattern layer. The printed pattern layer is provided on the polarizer, which brings a beautiful appearance display effect to the AMOLED structure, and solves the problem that the cover glass cannot be printed with patterns and has a low printing yield due to the use of tempered glass or a special-shaped surface. However, it does not improve the flexibility and wear resistance of the AMOLED structure.

[0005] CN 107742634 A discloses an AMOLED display screen, which includes a display panel and a touch panel, wherein the display panel includes a glass substrate, a gate layer, a first protective layer, a data line layer, a second protective layer and a pixel electrode layer bonded in sequence, an indium tin oxide ITO layer is also provided between the glass substrate and the first protective layer, the ITO layer is connected to the gate layer, and the overlapping part of the ITO layer and the pixel electrode layer constitutes a storage capacitor; the touch panel includes two layers of transparent conductive films, an optically transparent adhesive layer sandwiched between the two layers of transparent conductive films, and a protective layer located at the outermost layer. Although a protective layer is provided in its structure, it cannot prevent or repair cracks or scratches.

[0006] CN 105590573 A discloses a repair structure and a repair method for an AMOLED display panel line defect. The structure comprises the following steps: a conductive film in a repair circuit is correspondingly stacked and covered on a test TFT in an AMOLED display panel detection circuit and insulated from the test TFT; a repair wire in the repair circuit is insulated and crossed with all signal fan-out lines and corresponding test lines in the AMOLED display panel detection circuit. The repair circuit is directly grafted onto the AMOLED display panel detection circuit, and the existing AMOLED display panel detection circuit layout can be utilized. A repair circuit with a repair function is introduced. However, the repair circuit can only perform circuit repair, and cannot repair cracks on the AMOLED display panel.

[0007] Therefore, in the art, it is expected to develop an AMOLED display screen with a self-repairing function so that cracks can be repaired when they occur, thereby extending the service life of the device. Summary of the invention

[0008] In view of the deficiencies in the prior art, an object of the present invention is to provide a flexible AMOLED display screen, a crack repairing method thereof and a flexible display device.

[0009] In order to achieve the purpose of the invention, the present invention adopts the following technical solutions:

[0010] On the one hand, the present invention provides a flexible AMOLED display screen, which includes, from bottom to top, a flexible driving backplane layer, an organic light-emitting layer, a touch layer, a polarizing plate layer, and a self-repairing layer.

[0011] The self-repairing layer is arranged on the polarizing plate layer of the flexible AMOLED display screen of the present invention, so that when scratches or cracks occur on the display screen, the self-repairing function can be exerted, and the original strength of the protective film layer can be restored to a great extent, thereby extending the service life of the display screen.

[0012] Preferably, the raw materials for preparing the self-healing layer include the following components in percentage by mass: 80-90% of matrix material, 10-20% of repair agent microcapsules and / or repair agent microfibers, and 0.1-2% of catalyst.

[0013] In the present invention, the matrix material is epoxy vinyl ester and / or polyurethane.

[0014] In the present invention, the mass percentage of the matrix material in the self-repairing layer can be 80%, 81%, 81.5%, 82%, 82.5%, 83%, 84%, 85%, 86%, 87%, 88%, 89% or 90%.

[0015] Preferably, the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0016] Preferably, the repair agent is any one of epoxy resin prepolymer, polydimethylsiloxane (PDMS) or polydiethylsiloxane (PDES), or a combination of at least two thereof.

[0017] Preferably, the coating material is epoxy vinyl ester and / or polyurethane.

[0018] In the present invention, a self-repairing layer is obtained by using the components as described above. When cracks occur in the display screen, the repair agent in the repair agent microcapsule or the repair agent microfiber is released, and the repair agent contacts the catalyst in the self-repairing layer, and under the initiation of external conditions, a polymerization reaction occurs. The repair agent polymerizes to form a polymer and is connected to the matrix material, thereby filling the cracks to achieve the purpose of self-repair.

[0019] In the present invention, the mass percentage content of the repair agent microcapsules or repair agent microfibers in the self-repairing layer can be 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19% or 20%.

[0020] Preferably, the catalyst is an organic peroxide initiator or an azo initiator.

[0021] In the present invention, the mass percentage content of the catalyst in the self-repairing layer can be 0.1%, 0.3%, 0.5%, 0.8%, 1%, 1.2%, 1.4%, 1.6%, 1.8% or 2%.

[0022] Preferably, the thickness of the self-healing layer is 0.1-500 μm, for example 0.1 μm, 0.5 μm, 0.8 μm, 1 μm, 5 μm, 8 μm, 10 μm, 20 μm, 50 μm, 80 μm, 100 μm, 130 μm, 150 μm, 180 μm, 200 μm, 230 μm, 250 μm, 300 μm, 350 μm, 400 μm, 450 μm or 500 μm.

[0023] Preferably, the surface hardness of the self-healing layer is 4H or above, for example 4H, 4.5H, 5H, 5.5H, 6H, 6.5H, 7H, 7.5H, 8H, etc.

[0024] Preferably, the flexible driving backplane layer includes a polyimide film layer and a thin film transistor (TFT) arranged thereon.

[0025] Preferably, a protective layer is further included between the polarizing plate layer and the self-repairing layer.

[0026] Preferably, the protective layer is a polyester film layer, a polyimide film layer or a polyacrylate film layer.

[0027] Preferably, the protective layer is a polyethylene terephthalate (PET) film layer, a polyethylene naphthalate (PEN) film layer, a polyimide (PI) film layer or a polymethyl methacrylate (PMMA) film layer. In the present invention, the protective layer plays the role of supporting the self-repairing layer and protecting the functional layers of the AMOLED.

[0028] Preferably, the protective layer has a thickness of 5-100 μm, for example, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm or 100 μm.

[0029] In the present invention, the flexible driving backplane layer, organic light-emitting layer, touch layer, and polarizing layer in the flexible AMOLED display belong to the AMOLED screen part. In the preparation process of the flexible AMOLED display of the present invention, the AMOLED screen part can be prepared by applying existing technical means, the protective layer can be arranged on the AMOLED screen by pasting, and the self-repairing layer can be prepared by coating, inkjet printing, etc.

[0030] On the other hand, the present invention provides a method for repairing cracks in the flexible AMOLED display as described above, wherein when cracks occur in the flexible AMOLED display, the flexible AMOLED display is self-repaired under external conditions.

[0031] Preferably, the external condition is heating, ultraviolet irradiation or X-ray irradiation. For example, the heating temperature may be 70-80°C, such as 70°C, 71°C, 72°C, 73°C, 74°C, 75°C, 76°C, 77°C, 78°C, 79°C or 80°C.

[0032] In the present invention, when a crack occurs on the flexible AMOLED display screen, a series of chemical reactions occur under the initiation of external conditions, so that the two interfaces of the crack are healed again, thereby achieving self-repair.

[0033] In the present invention, in addition to the polymerization reaction of the repair agent in contact with the catalyst when cracks occur, free radicals can be generated in the repair agent under the irradiation of ultraviolet rays, thereby initiating free radical polymerization of the repair agent to form a polymer, further achieving the purpose of repairing cracks.

[0034] In another aspect, the present invention provides a flexible display device, comprising the flexible AMOLED display screen as described above.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The flexible AMOLED display screen of the present invention has good flexibility and self-repairing capability, and can self-repair internal or external cracks generated during its use, thereby extending the service life of the display screen and the display device, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 This is a schematic diagram of an exemplary structure of the flexible AMOLED display screen of the present invention, wherein 1 is a flexible driving backplane layer, 2 is an organic light-emitting layer, 3 is a touch layer, 4 is a polarizing plate layer, and 5 is a self-repairing layer.

[0038] Figure 2 This is another exemplary structural schematic diagram of the flexible AMOLED display screen of the present invention, wherein 1 is a flexible driving backplane layer, 2 is an organic light-emitting layer, 3 is a touch layer, 4 is a polarizing layer, 5 is a self-repairing layer, and 6 is a protective layer.

[0039] Figure 3 The present invention is a schematic flow chart of the process of the flexible AMOLED display screen during crack repair. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is further described below by specific implementation methods. It should be understood by those skilled in the art that the embodiments are only to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0041] Example 1

[0042] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 1 As shown, it includes, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing plate layer (4), and a self-repairing layer (5).

[0043] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 80% of base material, 18% of repair agent microcapsules or repair agent microfibers and 2% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0044] The repair agent is an epoxy resin prepolymer, the coating material is epoxy vinyl ester, the thickness of the self-repairing layer is 100 μm, and the surface hardness of the self-repairing layer is 4H.

[0045] Example 2

[0046] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 1As shown, it includes, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing plate layer (4), and a self-repairing layer (5).

[0047] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 85% of base material, 14.9% of repair agent microcapsules or repair agent microfibers and 0.1% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0048] The repair agent is polydimethylsiloxane, the coating material is polyurethane, the thickness of the self-repairing layer is 300 μm, and the surface hardness of the self-repairing layer is 5H.

[0049] Example 3

[0050] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 1 As shown, it includes, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing plate layer (4), and a self-repairing layer (5).

[0051] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 89% of matrix material, 10% of repair agent microcapsules or repair agent microfibers and 1% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0052] The repair agent is polydiethylsiloxane, the coating material is epoxyethylene ester, the thickness of the self-repairing layer is 500 μm, and the surface hardness of the self-repairing layer is 6H.

[0053] Example 4

[0054] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 1 As shown, it includes, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing plate layer (4), and a self-repairing layer (5).

[0055] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 80% of base material, 19% of repair agent microcapsules or repair agent microfibers and 1% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0056] The repair agent is polydiethylsiloxane, the coating material is polyurethane, the thickness of the self-repairing layer is 50 μm, and the surface hardness of the self-repairing layer is 4H.

[0057] Example 5

[0058] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 2 As shown, it comprises, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing layer (4), a protective layer (6), and a self-repairing layer (5).

[0059] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 89.5% of base material, 10% of repair agent microcapsules or repair agent microfibers and 0.5% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0060] The repair agent is a combination of polydimethylsiloxane and polydiethylsiloxane, the coating material is a combination of ethylene oxide and polyurethane, the thickness of the self-repairing layer is 80 μm, the surface hardness of the self-repairing layer is 4H, and the protective layer is a polyethylene terephthalate layer.

[0061] Example 6

[0062] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 2 As shown, it comprises, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing layer (4), a protective layer (6), and a self-repairing layer (5).

[0063] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 88% of matrix material, 10% of repair agent microcapsules or repair agent microfibers and 2% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0064] The repair agent is polydiethylsiloxane, the coating material is epoxyethylene ester, the thickness of the self-repairing layer is 100 μm, the surface hardness of the self-repairing layer is 4H, and the protective layer is a polyimide layer.

[0065] Example 7

[0066] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 2 As shown, it comprises, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing layer (4), a protective layer (6), and a self-repairing layer (5).

[0067] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 83% of matrix material, 16% of repair agent microcapsules or repair agent microfibers and 1% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0068] The repair agent is a combination of epoxy resin prepolymer and polydimethylsiloxane, the coating material is polyurethane, the thickness of the self-repairing layer is 300 μm, the surface hardness of the self-repairing layer is 5H, and the protective layer is a polyimide layer.

[0069] Example 8

[0070] In this embodiment, a flexible AMOLED display screen is provided, such as Figure 2 As shown, it comprises, from bottom to top, a flexible driving backplane layer (1), an organic light-emitting layer (2), a touch layer (3), a polarizing layer (4), a protective layer (6), and a self-repairing layer (5).

[0071] The raw materials for preparing the self-repairing layer include the following components in percentage by mass: 80% of base material, 18% of repair agent microcapsules or repair agent microfibers and 2% of catalyst; the repair agent microcapsules are obtained by coating the repair agent with a coating material.

[0072] The repair agent is an epoxy resin prepolymer, the coating material is polyurethane, the thickness of the self-repairing layer is 400 μm, the surface hardness of the self-repairing layer is 6H, and the protective layer is a polymethyl methacrylate layer.

[0073] Example 9

[0074] The flexible AMOLED display screen prepared in Examples 1-8 with cracks can be self-repaired. The process of repairing the cracks in the flexible AMOLED display screen is as follows: Figure 3 As shown, when cracks are generated on the outside / inside of the material of the flexible AMOLED display, the repair agent coated inside the material (i.e., the repair agent coated by the microcapsule or hollow fiber) leaks out, the repair agent fills the crack, comes into contact with the catalyst, and under the initiation of external conditions (such as heating, ultraviolet irradiation, X-ray radiation, etc.), a chemical reaction occurs, and the repair agent solidifies and fills the crack.

[0075] The flexible AMOLED display screen of the present invention can be used to prepare a flexible display device. Such a flexible display device has a self-repairing function, which greatly improves the service life of the device and has broad application prospects.

[0076] The applicant declares that the present invention uses the above-mentioned embodiments to illustrate the flexible AMOLED display screen, the crack repair method thereof and the flexible display device of the present invention, but the present invention is not limited to the above-mentioned embodiments, that is, it does not mean that the present invention must rely on the above-mentioned embodiments to be implemented. Those skilled in the art should understand that any improvement of the present invention, equivalent replacement of the raw materials selected by the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A flexible AMOLED display screen, characterized in that: The flexible AMOLED display screen is composed of a flexible driving backplane layer, an organic light-emitting layer, a touch layer, a polarizing layer, a protective layer and a self-repairing layer from bottom to top; The self-repairing layer plays a self-repairing role when scratches or cracks occur on the display screen; The surface hardness of the self-repairing layer is above 4H; The raw materials for preparing the self-repairing layer are composed of the following components in percentage by weight: 80-90% of a base material, 10-20% of a repair agent microcapsule and / or a repair agent microfiber, and 0.1-2% of an organic peroxide initiator or an azo initiator; The matrix material is epoxy vinyl ester and / or polyurethane; The repair agent microcapsules are obtained by coating the repair agent with a coating material; The repair agent is polydimethylsiloxane and / or polydiethylsiloxane; The coating material is epoxy vinyl ester and / or polyurethane.

2. The flexible AMOLED display according to claim 1, characterized in that: The thickness of the self-repairing layer is 0.1-500 μm.

3. The flexible AMOLED display according to claim 1, characterized in that: The flexible driving backplane layer includes a polyimide film layer and a thin film transistor arranged thereon.

4. The flexible AMOLED display according to claim 1, characterized in that: The protective layer is a polyester film layer, a polyimide film layer or a polyacrylate film layer.

5. The flexible AMOLED display screen according to claim 1, characterized in that: The thickness of the protective layer is 5-100 μm.

6. The method for repairing cracks in a flexible AMOLED display according to any one of claims 1 to 5, characterized in that: The method comprises: when cracks occur on the flexible AMOLED display screen, the flexible AMOLED display screen is self-repaired under external conditions.

7. The method for repairing cracks in a flexible AMOLED display according to claim 6, characterized in that: The external conditions are heating, ultraviolet irradiation or X-ray irradiation.

8. A flexible display device, characterized in that: The flexible display device comprises the flexible AMOLED display screen according to any one of claims 1 to 5.

Images