CN209890544U - Protection film, screen assembly - Google Patents
Protection film, screen assembly Download PDFInfo
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- CN209890544U CN209890544U CN201920173900.4U CN201920173900U CN209890544U CN 209890544 U CN209890544 U CN 209890544U CN 201920173900 U CN201920173900 U CN 201920173900U CN 209890544 U CN209890544 U CN 209890544U
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Abstract
The utility model provides a protection film, screen assembly belongs to protection film technical field, and its protection film that can solve current PET substrate is not applicable to the problem that has fingerprint recognition function under the optical screen. The substrate layer in the protective film of the utility model is made of transparent material without birefraction, and when the protective film is used for protecting the optical screen with the fingerprint identification function, the polarized light transmittance can not be reduced; and meanwhile, the hardened coating in the protective film has the functions of wear resistance and scratch resistance, and can play an excellent screen protection function. In addition, the isolation layer arranged between the base material layer and the hardened coating layer can increase the tear resistance of the protective film.
Description
Technical Field
The utility model belongs to the technical field of the protection film, concretely relates to protection film, screen assembly.
Background
In recent years, curved screens are applied more and more widely in smart phones, and therefore, the demand for corresponding screen protection films is also rapidly increasing. The protective film needs to have certain flexibility to adapt to the adhesion of a curved screen, and also needs certain surface hardness and scratch resistance.
The inventor finds that at least the following problems exist in the prior art: the existing curved screen protective film usually selects a polyethylene terephthalate (PET) film as a substrate layer, and the mechanical property and the chemical resistance of the film are very good. However, the polyethylene terephthalate film generally has a birefringence phenomenon, and if the polyethylene terephthalate film is used as a protective film of a smart phone with an optical underscreen fingerprint identification function, the transmittance of polarized light is reduced, and the optical underscreen fingerprint identification is affected.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the problem of the screen that the protection film to current PET substrate is not applicable to the fingerprint recognition function under having the optical screen provides a protection film, screen assembly.
Solve the utility model discloses the technical scheme that technical problem adopted is:
a protective film, comprising:
the substrate layer is made of transparent materials and does not have birefringence;
a hardened coating for scratch resistance;
the isolation layer is arranged between the base material layer and the hardening coating layer and used for isolating the base material layer and the hardening coating layer.
Optionally, the substrate layer is any one of a polymethyl methacrylate film, a polycarbonate film, a polyurethane film, a triacetate fiber film, and a cycloolefin polymer film, or a composite film formed by stacking several films.
Optionally, the thickness of the substrate layer ranges from 20 μm to 200 μm.
Optionally, the hardened coating is a crosslinked polyacrylate coating.
Optionally, the hardened coating has a thickness in the range of 0.5 μm to 10 μm.
Optionally, the isolation layer is made of a polyacrylate material or a polyester material.
Optionally, the thickness of the isolation layer is in a range of 20nm to 5000 nm.
Optionally, one side of the substrate layer, which is away from the isolation layer, is further provided with a flexible layer, and the softness of the flexible layer is greater than that of the substrate layer.
Optionally, the flexible layer is composed of a polyurethane material.
Optionally, the flexible layer has a thickness in the range of 20 μm to 100 μm.
Optionally, a binder layer is further disposed on one side of the substrate layer facing away from the isolation layer.
Optionally, the adhesive layer has a thickness in the range of 10 μm to 100 μm.
Optionally, a flexible layer is further arranged on one side of the substrate layer, which is away from the isolation layer, and the softness of the flexible layer is greater than that of the substrate layer; one side of the flexible layer, which is far away from the isolation layer, is also provided with a binder layer.
The utility model also provides a screen assembly, including the screen main part, and locate the protection film of screen main part light-emitting side, wherein, the protection film is foretell protection film.
Optionally, the screen body comprises an optical underscreen fingerprint identification element.
Optionally, the screen body includes any one of a rigid curved display screen, a flexible display screen, and a touch screen.
The substrate layer in the protective film of the utility model is made of transparent material without birefraction, and when the protective film is used for protecting the optical screen with the fingerprint identification function, the polarized light transmittance can not be reduced; and meanwhile, the hardened coating in the protective film has the functions of wear resistance and scratch resistance, and can play an excellent screen protection function. In addition, the isolation layer arranged between the base material layer and the hardened coating layer can increase the tear resistance of the protective film.
Drawings
Fig. 1 is a schematic structural diagram of a protective film according to an embodiment of the present invention;
fig. 2 is another schematic structural diagram of the protective film according to the embodiment of the present invention;
fig. 3 is a schematic structural diagram of a protective film according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a protective film according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a screen assembly according to an embodiment of the present invention;
fig. 6 is a schematic view of a tear strength test of a protective film according to an embodiment of the present invention;
fig. 7 is a schematic view illustrating a polarized light transmittance test of the protective film according to an embodiment of the present invention;
wherein the reference numerals are: 1. a substrate layer; 2. hardening the coating; 3. an isolation layer; 4. a flexible layer; 5. an adhesive layer; 6. a protective film; 71. an adhesive tape; 72. a polarizing plate; 73. a light source; 74. a detector; 8. a screen main body.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Protective film
The present embodiment provides a protective film 6, as shown in fig. 1 to 4, which includes a substrate layer 1, a cured coating layer 2, and an isolation layer 3 disposed between the substrate layer 1 and the cured coating layer 2; the substrate layer 1 is made of transparent materials, and the substrate layer 1 is free of birefringence; the hardened coating 2 is used for scratch resistance; the isolation layer 3 is used for isolating the substrate layer 1 from the hardened coating 2.
In the protective film of the embodiment, the substrate layer 1 is made of a transparent material without birefringence, so that when the protective film is used for protecting an optical screen with a fingerprint identification function, the polarization light transmittance is not reduced; and meanwhile, the hardened coating 2 in the protective film has the functions of wear resistance and scratch resistance, and can play an excellent screen protection function. In addition, the isolation layer 3 arranged between the base material layer 1 and the hardened coating layer 2 can increase the tear resistance of the protective film.
In this embodiment, the specific material of the substrate layer 1 is not limited, and a transparent material without birefringence may be selected according to needs, for example, the substrate layer 1 may be any one of a polymethyl methacrylate film (PMMA), a polycarbonate film (PC), a polyurethane film (PU), a triacetate fiber film (TAC), and a cyclic olefin polymer film (COP), or a composite film formed by stacking several films.
That is, in the present embodiment, the substrate layer 1 is made of a transparent material other than PET material which is likely to cause birefringence. Therefore, when the protective film is used for protecting the optical screen with the fingerprint identification function, the phenomenon of double refraction can not be generated.
The specific size or shape of the substrate layer 1 is not limited in this embodiment, and the substrate layer 1 may be cut according to the size or shape of the screen to be protected, and the specific thickness of the substrate layer 1 is also not limited in this embodiment, and in one embodiment, the thickness of the substrate layer 1 ranges from 20 μm to 200 μm.
Wherein, if the thickness of substrate layer 1 is too thick, when it is used for the screen, can increase the whole thickness of product, if the thickness of substrate layer 1 is too thin, then the protection film can't play sufficient guard action. The substrate layer 1 with the thickness of 20-200 μm can ensure that the protective film has better protective performance, and the substrate layer 1 with the thickness of 60-100 μm has better protective performance.
The specific material of the hardened coating 2 is not limited in this embodiment, and in one embodiment, the hardened coating 2 is a crosslinked polyacrylate coating. Among them, the crosslinked polyacrylate coating may allow the protective film to have excellent rubbing resistance and scratch resistance.
If the hard coat layer 2 is too thin, it is easily scratched in long-term use. If the hardened coating 2 is too thick, the stiffness of the product is greatly increased, thereby reducing the adherence on the curved screen. In a particular embodiment, the hardened coating 2 has a thickness in the range of 0.5 μm to 10 μm.
I.e. a hardened coating 2 with a thickness of 0.5 μm to 10 μm, may give better abrasion and scratch resistance.
The present inventors have found that if a resin for preparing an acrylate hard coat layer is directly coated on a substrate layer 1 (for example, a non-birefringent transparent material such as PC or PMMA) and cured to form a hard coat layer 2, the resin for preparing the acrylate hard coat layer may penetrate into the substrate layer 1 during the above coating process, thereby greatly reducing the tear resistance of the obtained protective film.
In one embodiment, the barrier layer 3 is composed of a polyacrylate material or a polyester material.
That is, the polyacrylate or polyester material separates the resin used for preparing the acrylate hardened coating from the base material layer 1 (for example, PC or PMMA), and can prevent the resin from penetrating into the base material layer, thereby greatly improving the tear resistance of the protective film. The thickness of the spacer layer 3 may be 20nm to 5000nm as the practical need.
In one embodiment, as shown in fig. 2, the side of the substrate layer 1 facing away from the isolation layer 3 is further provided with an adhesive layer 5.
The adhesive layer 5 serves to adhesively fix the substrate layer 1 to the screen, thereby ensuring that the position of the protective film relative to the screen is relatively fixed. It is understood that the adhesive layer 5 is not a necessary structural layer for the protective film, and the adhesive layer 5 may be directly formed on the screen and then the protective film without the adhesive layer 5 may be attached to the screen with the adhesive layer 5.
The thickness of the adhesive layer 5 should not be too thick, if the thickness is too thick, the product thickness is increased, and the glue overflow phenomenon is easy to occur, and the thickness of the adhesive layer 5 should not be too thin, so that firm adhesion cannot be realized. As an alternative to this embodiment, the adhesive layer 5 has a thickness in the range of 10 μm to 100 μm.
In another embodiment, as shown in fig. 3, the side of the substrate layer 1 facing away from the isolation layer 3 is further provided with a flexible layer 4, and the softness of the flexible layer 4 is greater than that of the substrate layer 1.
That is to say, the protection film of this embodiment includes a plurality of structural layers, and when this protection film was attached to the screen, flexible layer 4 was closer to the screen setting than other structural layers, and wherein, the compliance of flexible layer 4 was better than the compliance of substrate layer 1, and softer flexible layer 4 can protect the screen on the one hand, and on the other hand, softer flexible layer 4 can increase the holistic flexibility of protection film.
The specific material of the flexible layer 4 is not limited in this embodiment, and the flexible layer 4 may be made of a polyurethane material.
Specifically, the flexible polyurethane layer 4 may be formed on the other surface of the substrate layer 1 by coating.
As an alternative to this embodiment, the flexible layer 4 has a thickness in the range of 20 μm to 100 μm.
The thickness of the flexible layer 4 can be selected according to actual needs, and more specifically, different types of coating rollers can be selected to form the flexible layer 4 with a predetermined thickness.
In one embodiment, as shown in fig. 4, the protective film is provided with a hardening coating layer 2, an isolation layer 3, a base material layer 1, a flexible layer 4 and an adhesive layer 5 from top to bottom in sequence. Wherein the adhesive layer 5 is used for adhering to the screen and the outermost hardened coating 2 is used for protecting the screen from scratches.
Screen assembly
The present embodiment further provides a screen assembly, as shown in fig. 5, including a screen main body 8, and a protective film 6 disposed on the light exit side of the screen main body, wherein the protective film 6 is the protective film 6 of the above embodiment.
The screen assembly is provided with the protective film 6 of the above embodiment on the light exit side of the screen main body 8, which is suitable for various screens.
As an alternative to this embodiment, the screen body comprises an optical fingerprint recognition element.
Since the base material layer 1 of the protective film 6 is made of a material having no birefringence, birefringence does not occur when the protective film is used for protecting an optical panel having a fingerprint recognition function. That is, the protective film of the above embodiment does not reduce the transmittance of polarized light, and does not affect the optical underscreen fingerprint recognition.
Optionally, the screen body includes any one of a rigid curved display screen, a flexible display screen, and a touch screen.
Specifically, the screen body may be: the display device comprises any product or component with a display function, such as a liquid crystal display panel, electronic paper, an OLED panel, a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
Examples
The following describes in greater detail various embodiments of the present invention.
1. Raw materials
The embodiment of the utility model provides an in the raw materials that adopt be the market, can choose for use following market raw materials, also can choose for use the raw materials that other similar manufacturers provided, all can obtain the experimental result similar to this case embodiment, the particular case is as follows:
substrate layer: PMMA film, model PARAPURETM, HI grade, supplier Kararay.
PC film, model TP801, supplier Sabic.
PMMA/PC composite film, model 6060, supplier Sabic.
PET film, model A4300, available from Toyobo, Doyobo.
Hardened coating resin, model Momentive8777, supplier Mylar graphics.
Polyester polyol, model XCP-500N, supplied by Asahi Sichuan Chemicals.
Isocyanate curing agent, model Desmodur N3390, Desmodur4470, supplier Corsai.
Acrylic-styrene copolymer emulsion, model Neocryl A-1092 (48% solids), supplier DSM.
Polyester resin, V2200B, supplier Bostik.
Aziridine crosslinking agent CX-100, supplier DSM.
OCA film, supplier 3M.
2. Specific examples and comparative examples
Different protective films were prepared from the above raw materials, and the examples and comparative examples were as follows:
example 1:
as shown in fig. 1, a PMMA film is used as a substrate layer 1, and a acrylic-styrene copolymer emulsion neocryl a-1092 is coated on the PMMA film by a 5# wire bar (wet film thickness is 5 μm), and dried in an oven at 100 ℃ for 3 minutes to form an isolation layer 3.
The hardened coating resin Momentive8777 (25% solids content) was coated on the above-mentioned separator with a C-22 wire bar (wet film thickness: 22 μm), and dried in an oven at 100 ℃ for 3 minutes to obtain a hardened coating 2. And then further cured under a mercury lamp to obtain a protective film.
Example 2:
as shown in FIG. 4, a PC film was used as a base material layer 1, and the emulsion NeocrylA-1092 was coated on the PC film base material with a No. 5 wire bar (wet film thickness: 5 μm), and dried in an oven at 100 ℃ for 3 minutes to form a separator 3.
The cured coating resin Momentive8777 (25% solids content) was coated on the above-mentioned barrier layer with a C-22 wire bar (wet film thickness 22 μm) and dried in an oven at 100 ℃ for 3 minutes. And then further cured under a mercury lamp to obtain a hardened coating 2.
The other side of the substrate layer is coated with the raw material for forming the PU layer, and specifically, the raw material for forming the PU layer may be selected and adjusted according to actual needs, and for example, it may include polyester polyol, isocyanate, solvent, and the like. And then drying and curing in an oven, drying at 70 ℃ for 5 minutes, and further curing at 120 ℃ for 10 minutes to obtain the polyurethane flexible layer 4. And a layer of 3M OCA adhesive film is pasted on the cured polyurethane flexible layer to serve as an adhesive layer 5.
Example 3:
as shown in FIG. 2, a PMMA/PC composite film is used as a substrate layer 1, 2.5g of polyester resin v2200B is dissolved in 47.5g of ethyl acetate, then 0.25g of aziridine crosslinking agent CX-100 is added, and the mixture is uniformly stirred. The resulting coating was coated on the above PC thin film substrate layer with a No. 5 wire bar (wet film thickness 5 μm), and dried in an oven at 100 ℃ for 3 minutes to form an isolation layer 3.
The cured coating resin Momentive8777 (25% solids) was coated on the barrier layer with a C-22 wire bar (wet film thickness 22 microns) and dried in an oven at 100 ℃ for 3 minutes. And then further cured under a mercury lamp to obtain a hardened coating 2.
And a layer of 3M OCA adhesive film is pasted on the other side of the PMMA/PC film to be used as an adhesive layer 5.
Comparative example 1:
the hardened coating resin Momentive8777 (25% solids) was coated on the PMMA film substrate layer with a C-22 wire bar (wet film thickness 22 microns) and dried in an oven at 100 ℃ for 3 minutes. And then further cured under mercury lamp.
Comparative example 2:
the cured coating resin Momentive8777 (25% solids) was coated onto a PC film substrate with a C-22 wire bar (wet film thickness 22 microns) and oven dried in a 100 ℃ oven for 3 minutes. And then further cured under mercury lamp. The same mixed solution of the raw materials for forming the PU layer as in example 2 was coated on the other side of the substrate layer with a comma roll, and then dried and cured in an oven at 70 ℃ for 5 minutes and further cured at 120 ℃ for 10 minutes to obtain a polyurethane flexible layer. And sticking a layer of 3M OCA adhesive film on the cured polyurethane layer.
Comparative example 3
The cured coating resin Momentive8777 (25% solids) was coated on a PET film substrate with a C-22 wire bar (wet film thickness 22 microns) and oven dried in a 100 ℃ oven for 3 minutes. And then further cured under mercury lamp. The same mixed solution of the raw materials for forming the PU layer as in example 2 was coated on the other side of the substrate layer with a comma roll, and then dried and cured in an oven at 70 ℃ for 5 minutes and further cured at 120 ℃ for 10 minutes. And sticking a layer of 3M OCA adhesive film on the cured polyurethane layer.
3. Performance test method
In order to evaluate the performance of the protective films of the examples and comparative examples, they were subjected to a series of performance tests, the specific test methods were as follows:
1) pencil hardness: GB/T6739-2006
2) And (3) steel wool testing: a1 kg load was applied by using a special steel wool (steel wool type: #0000), and the surface of the protective film sample was rubbed back and forth for 500 cycles at a speed of 40 to 60 times/min with a 2X 2cm indenter and a stroke of about 20 mm.
3) Tear strength:
as shown in FIG. 6, two tapes were stuck to both front and back surfaces of the protective film sample, and the two tapes were held by a jig and stretched in opposite directions until the film sample was torn or the tapes slipped. The maximum load (N) during the recording process. If tape slippage occurs, it is recorded as greater than the maximum load.
4) Polarized light transmittance: as shown in fig. 7, the two polarizers were placed in the same orientation between the light source and the detector, and the intensity of light at 550nm wavelength was recorded as 100%. The sample is placed between the two polarizers and rotated 360 degrees along the Z axis, and the maximum and minimum values of the light intensity are recorded, corresponding to the maximum and minimum values of the polarized light transmittance.
4. Results of Performance testing
The protective films of the above examples and comparative examples were subjected to performance tests in the above experimental manner, and the test results are shown in the following table:
the protective film has the advantages that the lowest value of the polarized light transmittance of the protective film reaches about 90%, and the protective film has good surface hardness (pencil hardness), wear resistance and tear strength.
According to comparative example 1, since it provides a protective film that does not include a separator, the protective film provided by comparative example 1 has insufficient tear strength as compared to example 1.
According to comparative example 2, since it provided a protective film that did not include a separator, comparative example 2 provided a protective film that had insufficient tear strength compared to example 2.
According to comparative example 3, since the substrate layer of the protective film provided thereto was a PET film having birefringence, the lowest value of the polarized light transmittance of the protective film was significantly reduced, which would affect the speed and accuracy of fingerprint recognition under the optical screen.
It is to be understood that the above embodiments are merely exemplary embodiments that have been employed to illustrate the principles of the present invention, and that the present invention is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (14)
1. A protective film, comprising:
the substrate layer is made of transparent materials and does not have birefringence;
a hardened coating for scratch resistance; the hardened coating is a crosslinked polyacrylate coating;
the isolation layer is arranged between the substrate layer and the hardened coating and used for isolating the substrate layer from the hardened coating; the isolation layer is made of polyacrylate materials or polyester materials.
2. The protective film according to claim 1, wherein the substrate layer is any one of a polymethyl methacrylate film, a polycarbonate film, a polyurethane film, a triacetate fiber film, a cyclic olefin polymer film, or a composite film formed by stacking several films.
3. The protective film of claim 1, wherein the substrate layer has a thickness in the range of 20 μ ι η to 200 μ ι η.
4. The protective film of claim 1, wherein the hardened coating has a thickness in the range of 0.5-10 μ ι η.
5. The protective film of claim 1, wherein the spacer layer has a thickness in a range of 20nm to 5000 nm.
6. The protective film according to claim 1, wherein a flexible layer is further disposed on a side of the substrate layer facing away from the isolation layer, and a softness of the flexible layer is greater than a softness of the substrate layer.
7. The protective film of claim 6, wherein the flexible layer is comprised of a polyurethane material.
8. The protective film according to claim 6, wherein the flexible layer has a thickness in the range of 20 μm to 100 μm.
9. The protective film of claim 1, wherein the substrate layer is further provided with an adhesive layer on a side facing away from the release layer.
10. The protective film of claim 9, wherein the adhesive layer has a thickness in a range of 10 μ ι η to 100 μ ι η.
11. The protective film according to claim 1, wherein a flexible layer is further disposed on a side of the substrate layer facing away from the isolation layer, and the softness of the flexible layer is greater than that of the substrate layer; one side of the flexible layer, which is far away from the isolation layer, is also provided with a binder layer.
12. A screen assembly, comprising a screen main body and a protective film arranged on a light-emitting side of the screen main body, wherein the protective film is as claimed in any one of claims 1 to 11.
13. A screen assembly as recited in claim 12, wherein the screen body includes an optical underscreen fingerprint identification element.
14. A screen assembly as recited in claim 12, wherein the screen body includes any one of a rigid curved display screen, a flexible display screen, and a touch screen.
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| CN201920173900.4U CN209890544U (en) | 2019-01-31 | 2019-01-31 | Protection film, screen assembly |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10985344B2 (en) | 2017-10-27 | 2021-04-20 | Applied Materials, Inc. | Flexible cover lens films |
| CN113322022A (en) * | 2021-06-25 | 2021-08-31 | 深圳市方胜光学材料科技有限公司 | UV light-shaped flexible protective film for 3D curved screen and preparation process thereof |
| CN114671144A (en) * | 2020-12-27 | 2022-06-28 | 华为技术有限公司 | Screen protection film, preparation method thereof and electronic equipment |
| US11579339B2 (en) | 2018-05-10 | 2023-02-14 | Applied Materials, Inc. | Replaceable cover lens for flexible display |
| US11789300B2 (en) | 2019-06-26 | 2023-10-17 | Applied Materials, Inc. | Flexible multi-layered cover lens stacks for foldable displays |
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2019
- 2019-01-31 CN CN201920173900.4U patent/CN209890544U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10985344B2 (en) | 2017-10-27 | 2021-04-20 | Applied Materials, Inc. | Flexible cover lens films |
| US11758757B2 (en) | 2017-10-27 | 2023-09-12 | Applied Materials, Inc. | Flexible cover lens films |
| US11579339B2 (en) | 2018-05-10 | 2023-02-14 | Applied Materials, Inc. | Replaceable cover lens for flexible display |
| US11789300B2 (en) | 2019-06-26 | 2023-10-17 | Applied Materials, Inc. | Flexible multi-layered cover lens stacks for foldable displays |
| US11934056B2 (en) | 2019-06-26 | 2024-03-19 | Applied Materials, Inc. | Flexible multi-layered cover lens stacks for foldable displays |
| US11940682B2 (en) | 2019-06-26 | 2024-03-26 | Applied Materials, Inc. | Flexible multi-layered cover lens stacks for foldable displays |
| US11940683B2 (en) | 2019-06-26 | 2024-03-26 | Applied Materials, Inc. | Flexible multi-layered cover lens stacks for foldable displays |
| CN114671144A (en) * | 2020-12-27 | 2022-06-28 | 华为技术有限公司 | Screen protection film, preparation method thereof and electronic equipment |
| CN113322022A (en) * | 2021-06-25 | 2021-08-31 | 深圳市方胜光学材料科技有限公司 | UV light-shaped flexible protective film for 3D curved screen and preparation process thereof |
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