CN111696442A - Flexible screen folding cover plate, preparation method thereof and flexible display module - Google Patents
Flexible screen folding cover plate, preparation method thereof and flexible display module Download PDFInfo
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- CN111696442A CN111696442A CN202010554623.9A CN202010554623A CN111696442A CN 111696442 A CN111696442 A CN 111696442A CN 202010554623 A CN202010554623 A CN 202010554623A CN 111696442 A CN111696442 A CN 111696442A
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
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Abstract
The invention provides a flexible screen folding cover plate, a preparation method thereof and a flexible display module, and solves the problem that the folding cover plate in the existing flexible screen is poor in bending performance. The flexible screen folding cover plate comprises: a flexible substrate; and a cover layer formed on the surface of the flexible substrate; wherein the cover layer comprises at least one layer of negative poisson's ratio material. The covering layer comprising at least one negative Poisson ratio material layer is arranged on the surface of the flexible substrate, and the covering layer on the surface layer has the negative Poisson ratio characteristic, so that the stress concentration of the covering plate under stress is reduced, the risk of cracks and even breakage on the surface of the covering plate is reduced, and the bending performance of the flexible screen folding covering plate is further improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible screen folding cover plate, a preparation method thereof and a flexible display module.
Background
The flexible screen folding cover plate is used as an important component of the bendable flexible screen and is arranged at the outermost end of the flexible screen. Along with the continuous development of display technology, the flexible screen with good bending performance is more and more favored by the market, and then higher requirements are provided for the bending performance of the flexible screen folding cover plate. The existing flexible screen folding cover plate is mostly prepared by using Colorless transparent Polyimide (CPI) and a hardened coating or Ultra-Thin Glass (UTG), but the flexible screen folding cover plate has the problems of poor bending performance and crack, surface scratch, internal broken line and the like without realizing the expected bending times.
Disclosure of Invention
In view of this, embodiments of the present invention provide a flexible screen folding cover plate and a manufacturing method thereof, and in addition, the present invention also provides a flexible display module applying the flexible screen folding cover plate, so as to solve the problem of poor bending performance of the existing flexible screen folding cover plate.
According to a first aspect of the present invention, an embodiment of the present invention provides a flexible screen folding cover, including: a flexible substrate; and a cover layer formed on the surface of the flexible substrate; wherein the cover layer comprises at least one layer of negative poisson's ratio material.
In one embodiment, the layer of negative poisson's ratio material has a thickness of 15-70 nm.
In one embodiment, the material of the cover layer is selected from one or more of the following materials: silicon dioxide, graphene, polytetrafluoroethylene, and indium tin alloy.
In one embodiment, the flexible substrate comprises a first substrate and a second substrate in a stacked arrangement; the covering layer comprises at least one first negative Poisson ratio material layer formed on the surface of the first substrate and at least one second negative Poisson ratio material layer formed on the surface of the second substrate and far away from the first negative Poisson ratio material layer.
In one embodiment, the first substrate and the second substrate are made of the same or different materials.
In one embodiment, the material of the flexible substrate is selected from colorless transparent polyimide, polyethylene terephthalate, cyclic olefin polymer, cyclic olefin copolymer, or ultra-thin glass.
In one embodiment, the flexible substrate has a thickness less than a thickness of the cover layer.
In one embodiment, the thickness of the cover layer is 20-90 μm.
According to a second aspect of the present invention, an embodiment of the present invention provides a flexible display module, including any one of the flexible screen folding cover plates described above.
According to a third aspect of the present invention, an embodiment of the present invention provides a method for manufacturing a flexible screen folding cover plate, including the following steps: providing a flexible substrate; forming a covering layer on the surface of the flexible substrate; wherein the cover layer comprises at least one layer of negative poisson's ratio material.
In one embodiment, the forming of the cover layer on the surface of the flexible substrate includes: providing a mould, wherein the mould is provided with a plurality of concave structural units; covering the mold on the surface of the flexible substrate to form a plurality of grid-shaped gaps, and forming the covering layer at the grid-shaped gaps; and releasing the mold from the covering layer by using a heat treatment process.
In one embodiment, the forming of the cover layer on the surface of the flexible substrate includes: forming a deposition layer on the surface of the flexible substrate; providing a mould, wherein the mould is provided with a plurality of concave structure opening units, and the mould is covered on the surface of the deposition layer; and etching to remove the deposited material at the opening unit to form the covering layer.
According to the flexible screen folding cover plate, the preparation method thereof and the flexible display module, the covering layer comprising the at least one negative Poisson ratio material layer is arranged on the surface of the flexible substrate, and the covering layer on the surface layer of the folding cover plate has the negative Poisson ratio characteristic, so that stress concentration of the cover plate under stress is relieved, the risk of cracks and even breakage on the surface of the cover plate is reduced, and the bending performance of the flexible screen folding cover plate is improved.
Drawings
Fig. 1 is a schematic structural diagram of a flexible screen folding cover according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a flexible screen folding cover according to another embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a flexible screen folding cover according to still another embodiment of the present invention.
Fig. 4 is a schematic structural diagram of a flexible screen in a flexible display module according to an embodiment of the present invention.
Fig. 5 is a schematic view illustrating stress analysis of different film layers when a flexible screen is subjected to a stress according to an embodiment of the present invention.
Fig. 6 is a flowchart illustrating a method for manufacturing a flexible screen folding cover according to an embodiment of the present invention.
Fig. 7 is a schematic diagram illustrating a process of forming a negative poisson's ratio material layer in a covering layer according to an embodiment of the invention.
Fig. 8 is a flowchart illustrating a process of manufacturing a cover layer in a foldable cover plate of a flexible screen according to an embodiment of the present invention.
Fig. 9 is a flow chart illustrating a process for preparing a cover layer in a foldable cover plate for a flexible screen according to another embodiment of the present invention.
Detailed Description
As described in the background art, the existing flexible screen folding cover plate has the technical problem of poor bending performance. The inventor of the application finds that the flexible screen has two conditions of inward folding and outward folding in the using process, and when the flexible screen is folded inwards, the folding cover plate arranged on the surface is pressed; when the foldable cover plate is folded outwards, the foldable cover plate arranged on the surface is pulled, and the foldable cover plate has larger bearing capacity to compressive stress under the stress condition when being bent, but the overlarge tensile stress can easily generate adverse effect on the foldable cover plate. The reason why the number of bending times of the existing flexible screen cannot be predicted is that when the screen body is folded outwards, the folding cover plate arranged on the outermost side is subjected to tensile stress, and the surface of the folding cover plate generates large tensile strain due to the large tensile stress, so that the folding cover plate generates surface cracks and even breaks. In order to solve the problems, the inventor designs a negative Poisson ratio flexible screen folding cover plate, and as the internal structure of a negative Poisson ratio material is a spherical cavity, when the negative Poisson ratio material is stretched in a single direction, the negative Poisson ratio material can expand in a direction perpendicular to a pulling force direction; when compressed in a single direction, compression occurs perpendicular to the pressure direction; when the flexible screen folding cover plate is curled, the tension direction expands outwards in the vertical direction, and an area zone with small pressure is formed in the middle, so that the stress state of the flexible screen folding cover plate when stressed can be relieved, and the bending performance of the flexible screen folding cover plate is improved.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of a flexible screen folding cover according to an embodiment of the present invention. As shown in fig. 1, the flexible screen folding cover 100 includes: the flexible substrate comprises a flexible substrate 10 and a covering layer 20 formed on the surface of the flexible substrate 10, wherein the covering layer 20 comprises at least one negative poisson's ratio material layer 21.
Specifically, the cover layer 20 is disposed on the upper surface of the flexible substrate 10, and when the flexible screen folding cover sheet 100 is applied with a force, the cover layer 20 is the first applied surface. When the flexible screen folding cover plate 100 is subjected to an outward folding acting force, the covering layer 20 is subjected to tensile stress, the negative poisson's ratio material layer 21 is pulled in a single direction, the direction perpendicular to the tensile force expands, the stress concentration effect at the folding position of the flexible screen folding cover plate is weakened, the tensile strain generated on the surface of the flexible screen folding cover plate 100 is smaller, and therefore the risk that cracks or even fractures appear on the surface is reduced. It should be noted that the number of the negative poisson's ratio material layers 21 in the covering layer 20 may be one layer, two layers, three layers, or multiple layers, and the specific number of the negative poisson's ratio material layers 21 is not specifically limited in the embodiment of the present invention, as long as it is beneficial to the bending of the flexible screen folding cover plate 100. The material of the cover layer 20 may be selected from one or more of the following materials: silicon dioxide, graphene, polytetrafluoroethylene, and indium tin alloy. However, it should be understood that the specific selection of the material of the cover layer can be adjusted according to actual requirements, and the embodiment of the invention does not limit the specific selection of the material of the cover layer.
According to the flexible screen folding cover plate 100 provided by the embodiment of the invention, the covering layer 20 comprising at least one negative Poisson ratio material layer 21 is arranged on the surface of the flexible base material 10, and the outer covering layer 20 has the negative Poisson ratio characteristic, so that the stress concentration of the cover plate under stress is relieved, the risk of cracks and even breakage on the surface of the cover plate is reduced, and the bending performance of the flexible screen folding cover plate 100 is further improved.
In one embodiment of the present invention, the material of the flexible substrate 10 can be selectedThe Polymer material is selected from colorless transparent Polyimide (CPI), Polyimide (PI), polyethylene terephthalate (PET), Cyclic Olefin Polymer (COP) or Cyclic Olefin Copolymer (COC), and the Polymer material has better flexibility but lower hardness. Since the hardness H of a material can be expressed as the expression H ═ E/(1-v) for the modulus of elasticity E and poisson's ratio v2)]γThis becomes increasingly apparent as the absolute value of the negative poisson's ratio increases. As v approaches-1, the resistance against indentation tends to infinity. When the negative Poisson ratio material is impacted and loaded, the impacted area of the material is gathered to be more compact, and the indentation resistance is improved. The opposite is true for conventional materials, where impact loading causes the material to separate on both sides, with a hardness significantly lower than that of negative poisson's ratio materials. The cover layer 20 comprises at least one negative poisson's ratio material layer 21 and thus has a relatively high hardness and is effective against indentation.
According to the flexible screen folding cover plate 100 provided by the embodiment of the invention, the covering layer 20 comprising at least one negative Poisson ratio material layer 21 is arranged on the surface of the flexible substrate 10, when the screen hardness is tested, the covering layer 20 is under the action of impact load, and as the covering layer 20 can effectively resist indentation, no indentation is left on the surface of the flexible screen folding cover plate 100, and in addition, the scratch resistance of the flexible screen folding cover plate 100 is also improved.
In one embodiment of the present invention, the thickness of the negative poisson's ratio material layer is 15-70 nm. Because the thickness of the negative poisson's ratio material layer is in the nanometer level, the covering layer 20 can be made into an ultra-thin film layer, the transparency is high, compared with the existing covering plate with a hardened layer coated on the surface of the CPI substrate, the light transmittance of the flexible screen folding covering plate 100 can be improved, in addition, the thickness of the covering plate is integrally reduced, and the bending property of the flexible screen folding covering plate 100 can be further improved.
Fig. 2 is a schematic structural diagram of a flexible screen folding cover according to another embodiment of the present invention. As shown in fig. 2, the flexible screen folding cover 200 includes: the cover layer 20 comprises at least one first negative poisson's ratio material layer 21 formed on the surface of the first substrate 11 and at least one second negative poisson's ratio material layer 21 'formed on the surface of the second substrate 12 and far away from the first negative poisson's ratio material layer 21.
Specifically, the flexible screen folding cover plate 200 is a double-layer base material structure, the second base material 12 may be attached to the first negative poisson's ratio material layer 21 of the first base material 11 through the adhesive layer 30, the material of the adhesive layer 30 may be an optical adhesive, a pressure-sensitive adhesive or an adhesive, and the specific selection of the material of the adhesive layer 30 is not limited in the embodiment of the present invention. The material of the first substrate 11 and the second substrate 12 may be selected from Colorless transparent Polyimide (CPI), Polyimide (PI), Polyethylene Terephthalate (PET), Cyclic Olefin Polymer (COP), or Cyclic Olefin Copolymer (COC), and the material of the first substrate 11 and the second substrate 12 is not particularly limited by the embodiment of the present invention.
When the flexible screen folding cover plate 200 provided by the embodiment of the invention is subjected to an outward folding acting force, the tensile strain of the second base material 12 is large, the second negative poisson's ratio material layer 21' on the surface of the second base material 12 is pulled in a single direction and expands in a direction perpendicular to the tensile force, so that the stress concentration effect of the second base material 12 is weak; when the inward folding force is applied, the tensile strain applied to the first substrate 11 is large, and the first negative poisson's ratio material layer 21 on the surface of the first substrate 11 acts, so that the stress state of the first substrate 11 is relieved. Because the surfaces of the first base material 11 and the second base material 12 are both provided with the negative poisson's ratio material layer, the stress states of the first base material 11 and the second base material 12 are both improved, and the bending performance of the flexible screen folding cover plate 200 is improved. In addition, the cover plate with the double-layer base material structure can realize larger compression deformation and is an effective energy-absorbing material. Therefore, when the flexible screen folding cover plate 200 provided by the embodiment of the invention is applied to a flexible screen, the energy absorption of the screen body in a ball-drop pen-drop experiment is facilitated, the structure of the display module is not damaged, and the packaging reliability is further ensured.
In an embodiment of the present invention, the material of the first substrate 11 and the second substrate 12 may further be Ultra-Thin Glass (UTG). Although the bending performance of the ultra-thin glass is poor, when the cover plate is bent, the negative poisson's ratio material layer arranged above the ultra-thin glass bears large strain, so that the stress state of the ultra-thin glass is relieved, and the integral bending performance of the flexible screen folding cover plate 200 is improved.
Fig. 3 is a schematic structural diagram of a flexible screen folding cover according to still another embodiment of the present invention. As shown in fig. 3, the flexible screen folding cover 300 includes a flexible substrate 10 and a cover layer 20 formed on a surface of the flexible substrate 10, wherein a thickness of the flexible substrate 10 is smaller than a thickness of the cover layer 20.
In particular, the cover layer 20 comprises a plurality of layers 21 of negative poisson's ratio material. The flexible substrate 10 is an ultra-thin substrate, and the thickness of the flexible substrate 10 can be determined according to the thinnest substrate that can be prepared by the manufacturer, and the thickness of the flexible substrate 10 is not particularly limited in the present invention. The thickness of the cover layer 20 may be set between 20-90 μm to further improve the bending performance of the flexible screen folding cover sheet 300. Further, to improve the folding performance of the cover, the flexible screen-folding cover 300 may include only the cover 20. Compared with the existing folding cover plate with the thickness of 50-100 μm, the flexible screen folding cover plate 300 provided by the embodiment of the invention can further reduce the whole thickness of the cover plate so as to improve the bending performance of the cover plate.
Fig. 4 is a schematic structural diagram of a flexible screen in a flexible display module according to an embodiment of the present invention. As shown in fig. 4, the flexible screen 1000 includes a touch member 3001 and a flexible screen folding cover 1001 disposed over the touch member 3001. The flexible screen folding cover 1001 may be the flexible screen folding cover shown in any one of the embodiments of fig. 1 to 3.
Specifically, the flexible screen folding cover plate 1001 may be attached to the touch component 3001 through an adhesive layer 2001, the material of the adhesive layer 2001 may be an optical adhesive, a pressure-sensitive adhesive or an adhesive, and the specific selection of the material of the adhesive layer 2001 is not limited in the embodiment of the present invention. It should be understood that the touch assembly 3001 may be a polarizer layer, a metal touch layer, a packaging layer, an organic light emitting layer, an array circuit layer, etc. in sequence from the near to the far according to the distance from the foldable cover 1001 of the flexible screen, wherein the polarizer layer and the metal touch layer may exchange positions considering whether the metal touch layer is integrated with the packaging layer, and in addition, the touch assembly 3001 may further include other functional film layers.
Fig. 5 is a schematic view illustrating stress analysis of different film layers when a flexible screen is stressed according to an embodiment of the present invention. When the flexible screen receives the effort of turning over outward among the prior art, the folding apron that sets up on the surface is drawn, because the adhesive effect of glue film, the strain that interface department received is continuous, and the glue film atress of lower floor is the same, and then influences metal touch-control layer in the touch-control subassembly and produce the tensile strain under the effect of tensile stress, leads to the metal wire easily to take place the fracture. As shown in fig. 5, when the flexible screen 1000 provided by the embodiment of the present invention is subjected to an external folding force, since the negative poisson's ratio material layer on the surface of the folding cover plate 1001 of the flexible screen is pulled in a single direction and expands in a direction perpendicular to the pulling direction, the stress concentration effect at the bending position of the folding cover plate 1001 is reduced, so that the stress of the metal touch layer in the touch component 3001 is relieved, and the risk of breaking the metal wire due to stress release is reduced.
According to the flexible display module provided by the embodiment of the invention, the covering layer comprising at least one negative Poisson ratio material layer is arranged on the surface of the flexible substrate, and the covering layer on the surface layer of the folding covering plate has the negative Poisson ratio characteristic, so that the stress concentration of the covering plate and the metal touch layer is relieved when the covering plate and the metal touch layer are stressed, and the bending performance of the flexible screen in the flexible display module is further improved.
Fig. 6 is a flowchart of a method for manufacturing a flexible screen folding cover according to an embodiment of the present invention. As shown in fig. 6, the method for manufacturing the flexible screen folding cover plate includes the following steps:
s101: providing a flexible substrate;
s102: and forming a covering layer on the surface of the flexible substrate, wherein the covering layer comprises at least one negative Poisson ratio material layer.
Specifically, the material of the flexible substrate may be selected from Colorless transparent Polyimide (CPI), Polyimide (PI), Polyethylene Terephthalate (PET), Cyclic Olefin Polymer (COP), Cyclic Olefin Copolymer (COC), or Ultra Thin Glass (UTG). The flexible substrate can provide a flat surface for the formation of the cover layer, and the thickness thereof can be adjusted according to actual requirements. The material forming the cover layer may be selected from one or more of the following materials: silicon dioxide, graphene, polytetrafluoroethylene and indium-tin alloy, and the embodiment of the invention does not limit the specific selection of the material of the covering layer.
Fig. 7 is a schematic diagram illustrating a process of forming a negative poisson's ratio material layer in a covering layer according to an embodiment of the invention.
As shown in fig. 8, in an embodiment of the present invention, step S102 in the method for manufacturing a flexible screen folding cover specifically includes:
s1021: providing a mould which is provided with a plurality of concave structure units. Specifically, the mold has a plurality of concave structural units arranged in an array as shown in fig. 7a, and the shape of the mold unit in the present invention is not limited to the concave structure, and may also be a honeycomb structure, for example.
S1022: and covering the die as a mask on the surface of the flexible substrate to form a plurality of latticed gaps, and forming a covering layer at the plurality of latticed gaps. Specifically, a negative poisson's ratio material layer as shown in fig. 7b is formed at a plurality of grid gaps. This step may be repeated a number of times to form a coating having multiple layers of negative poisson's ratio material, the number of times being dependent upon the thickness of the coating to be produced. The preparation method of the covering layer can be prepared by Atomic Deposition (ALD), although the invention is not limited thereto, and the preparation process can also be a Physical Vapor Deposition (PVD) process and the like.
S1023: the mold is released from the cover layer using a heat treatment process. After the covering layer is formed, the mold is separated from the covering layer by utilizing a heat treatment process, and because the thermal expansion coefficient of the covering layer is larger than that of the mold, the shrinkage of the covering layer is larger than that of the mold during shrinkage, and a gap is formed between the covering layer and the mold to separate the covering layer and the mold.
With continuing reference to fig. 7, in another embodiment of the present invention, as shown in fig. 9, step S102 specifically includes:
s1021': and forming a deposition layer on the surface of the flexible substrate. The thickness of the Deposition Layer can be determined according to the thickness of the covering Layer to be prepared, and the preparation method of the Deposition Layer can be prepared by using an Atomic Layer Deposition (ALD) process, although the invention is not limited thereto, and the preparation process can also be a magnetron sputtering (PVD) process and the like.
And S1022': providing a mould which is provided with a plurality of concave structure opening units and covering the mould as a mask plate on the surface of the deposition layer. The shape of the die opening unit in the present invention is not limited to the concave structure shown in fig. 7a, and may be a honeycomb structure, for example.
S1023': and etching to remove the deposited material at the opening unit to form a covering layer. Specifically, the cover layer includes at least one negative poisson's ratio material layer as shown in fig. 7b, and the etching process may be a laser etching process, which is not particularly limited in the present invention.
Wherein, the deposition layer formed on the surface of the flexible substrate can be a SiO2 (silicon dioxide) film layer, and the specific preparation method of the SiO2 film layer comprises the following steps:
mixing reaction gases SiCl4 and H2O in proportion to react to generate SiO 2;
depositing the generated SiO2 on the surface of the mask plate with the pattern to form a film layer of SiO2 with the pattern on the surface of the flexible substrate, wherein the expansion coefficient of the SiO2 film layer is larger than the thermal expansion coefficient of the mask plate material;
and (4) separating the mask from the SiO2 film layer by using a heat treatment process.
The SiO2 film layer has simple preparation process, saves cost and is beneficial to industrial production.
According to the preparation method of the flexible screen folding cover plate provided by the embodiment of the invention, the covering layer comprising at least one negative Poisson ratio material layer is arranged on the surface of the flexible base material, and the covering layer on the surface layer of the folding cover plate has the negative Poisson ratio characteristic, so that the stress concentration of the cover plate under stress is relieved, the risk of cracks and even breakage on the surface of the cover plate is reduced, and the bending performance of the flexible screen folding cover plate is further improved.
It will be understood that the foregoing is illustrative of particular embodiments of the invention and that the invention is not limited thereto, as many similar variations are possible. All modifications which would occur to one skilled in the art and which are, therefore, directly derived or suggested from the disclosure herein are deemed to be within the scope of the present invention.
It should be understood that the terms such as first, second, etc. used in the embodiments of the present invention are only used for clearly describing the technical solutions of the embodiments of the present invention, and are not used to limit the protection scope of the present invention.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A flexible screen folding cover, comprising:
a flexible substrate; and
a covering layer formed on the surface of the flexible substrate;
wherein the cover layer comprises at least one layer of negative poisson's ratio material.
2. A flexible screen folding cover according to claim 1, characterized in that the material of the cover layer is selected from one or more of the following materials: silicon dioxide, graphene, polytetrafluoroethylene, and indium tin alloy.
3. A flexible screen folding cover according to claim 1, wherein the flexible substrate comprises a first substrate and a second substrate arranged in a stack;
the covering layer comprises at least one first negative Poisson ratio material layer formed on the surface of the first substrate and at least one second negative Poisson ratio material layer formed on the surface of the second substrate and far away from the first negative Poisson ratio material layer.
4. A flexible screen folding cover according to claim 3, characterized in that the first substrate and the second substrate are made of the same or different materials.
5. The flexible screen folding cover according to claim 4, characterized in that the material of the flexible substrate is selected from the group consisting of colorless transparent polyimide, polyethylene terephthalate, cyclic olefin polymer, cyclic olefin copolymer or ultra thin glass.
6. A flexible screen folding cover according to claim 1, characterized in that the thickness of the flexible substrate is smaller than the thickness of the cover layer.
7. A flexible display module, comprising the flexible screen folding cover plate of any one of claims 1 to 6.
8. A preparation method of a flexible screen folding cover plate is characterized by comprising the following steps:
providing a flexible substrate;
forming a covering layer on the surface of the flexible substrate;
wherein the cover layer comprises at least one layer of negative poisson's ratio material.
9. The method of claim 8, wherein the forming a cover layer on the surface of the flexible substrate comprises:
providing a mould, wherein the mould is provided with a plurality of concave structural units;
covering the mold on the surface of the flexible substrate to form a plurality of latticed gaps, and forming the covering layer at the plurality of latticed gaps;
and releasing the mold from the covering layer by using a heat treatment process.
10. The method of claim 8, wherein the forming a cover layer on the surface of the flexible substrate comprises:
forming a deposition layer on the surface of the flexible substrate;
providing a mould, wherein the mould is provided with a plurality of concave structure opening units, and the mould is covered on the surface of the deposition layer;
and etching to remove the deposited material at the opening unit to form the covering layer.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114783300A (en) * | 2022-05-30 | 2022-07-22 | 武汉华星光电半导体显示技术有限公司 | Flexible display module |
| CN114913775A (en) * | 2022-06-22 | 2022-08-16 | 武汉华星光电半导体显示技术有限公司 | Flexible display module and display device |
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