CN109712530B - Flexible display device and preparation method thereof - Google Patents
Flexible display device and preparation method thereof Download PDFInfo
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- CN109712530B CN109712530B CN201811628769.2A CN201811628769A CN109712530B CN 109712530 B CN109712530 B CN 109712530B CN 201811628769 A CN201811628769 A CN 201811628769A CN 109712530 B CN109712530 B CN 109712530B
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- 238000002360 preparation method Methods 0.000 title abstract description 9
- 238000005452 bending Methods 0.000 claims abstract description 505
- 239000000758 substrate Substances 0.000 claims abstract description 224
- 239000010410 layer Substances 0.000 claims abstract description 221
- 239000011241 protective layer Substances 0.000 claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 21
- 239000012790 adhesive layer Substances 0.000 claims description 18
- 230000008093 supporting effect Effects 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 5
- 229920001187 thermosetting polymer Polymers 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 26
- 239000003223 protective agent Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 16
- 238000001723 curing Methods 0.000 description 8
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- 238000009826 distribution Methods 0.000 description 3
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- 239000002994 raw material Substances 0.000 description 3
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000011344 liquid material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
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Abstract
The embodiment of the invention provides a flexible display device and a preparation method thereof, wherein a flexible substrate of the flexible display device is provided with a first flat area, a bending area and a second flat area; arranging a first bending protective layer in a bending area of the flexible substrate before bending so as to reduce bending difficulty and bending stress; the second bending protective layer is arranged in the bending area of the flexible substrate after bending, the first bending protective layer can be prevented from creeping after bending, and the bending area can be further protected, so that the phenomenon that the wiring arranged on the flexible substrate and the flexible substrate cracks due to the fact that the protection capability of the first bending protective agent on the wiring layer arranged on the flexible substrate and the flexible substrate is reduced is prevented, and the display effect of the flexible display device is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display device and a preparation method thereof.
Background
The flexible display device has variable and bendable performance, so that the flexible display device is widely applied. The current flexible display device is mainly manufactured by using a carrier substrate as a carrier to carry a flexible substrate and forming a display device on the flexible substrate; separating the flexible substrate from the carrier substrate to obtain a display panel of the flexible display device; the display panel is then bonded to a flexible circuit board and/or chip, etc.
The display panel of the flexible display device comprises a display area and a non-display area, wherein the display area is used for displaying images, characters and the like, and the non-display area is provided with wiring, a flexible circuit board and/or a chip and the like. In order to realize the narrow frame of the flexible display device, the non-display area of the display panel bound with the flexible circuit board and/or the chip can be bent to the back of the display screen. When the flexible display device is bent, the flexible display panel of the flexible display device and/or the wiring disposed on the flexible display panel may crack, which may affect the display effect of the flexible display device. In the prior art, the ultraviolet curing glue is coated on the bending area of the display panel of the flexible display device before bending, has a certain tensile modulus, and can protect the bending area of the flexible display device during bending deformation. However, the uv-curable adhesive is coated before the display panel is bent, which cannot permanently protect the flexible display panel of the flexible display device and the wiring disposed on the flexible display panel, and further affects the display effect.
Disclosure of Invention
The embodiment of the invention provides a flexible display device and a preparation method thereof, which can solve the technical problem that the display effect is influenced because a flexible display panel and wiring arranged on the flexible display panel cannot be protected for a long time due to a bending protective layer coated before bending in the prior art.
In a first aspect, an embodiment of the present invention provides a flexible display device, including:
a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the first flat area and the second flat area are arranged oppositely; the bending area is connected with the first flat area and the second flat area;
the first bending protective layer is at least positioned in the bending area;
the second bending protective layer is at least positioned in the bending area;
the elastic modulus of the second bending protection layer is larger than that of the first bending protection layer.
In a second aspect, an embodiment of the present invention provides a method for manufacturing a flexible display device, including:
providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first straight area and the second straight area;
forming a first bending protection layer at least in the bending area;
bending the second flat area to one side of the first flat area, which is far away from the display surface of the flexible display device, through the bending area, so that the first flat area and the second flat area are oppositely arranged;
forming a second bending protection layer at least in the bending area;
the elastic modulus of the second bending protection layer is larger than that of the first bending protection layer.
The embodiment of the invention provides a flexible display device and a preparation method thereof, wherein a flexible substrate of the flexible display device is provided with a first flat area, a bending area and a second flat area; the first straight area and the second straight area are arranged oppositely and connected through the bending area; through setting up the first protective layer of buckling in the district of buckling, in order when the flexible substrate buckles, the distribution that sets up on flexible substrate and the flexible substrate provides the guard action, and buckle the district and set up the second protection layer of buckling after buckling, and the elastic modulus of the second protection layer of buckling is greater than the elastic modulus of the first protection layer of buckling, thereby can prevent the creep that the first protection layer of buckling takes place after buckling, provide guard action to the first protection layer of buckling, creep takes place because of the protection layer of buckling in the district of buckling of flexible substrate among the prior art, cause the distribution that sets up on flexible substrate and/or the flexible substrate to take place the crackle, influence the technical problem of display effect. According to the embodiment of the invention, the first bending protection layer is arranged in the bending area of the flexible substrate before bending, so that the bending difficulty is reduced, and the bending stress is reduced; the second bending protective layer is arranged in the bending area of the flexible substrate after bending, the first bending protective layer can be prevented from creeping after bending, and the bending area can be further protected, so that the phenomenon that the wiring arranged on the flexible substrate and the flexible substrate cracks due to the fact that the protection capability of the first bending protective agent on the wiring layer arranged on the flexible substrate and the flexible substrate is reduced is prevented, and the display effect of the flexible display device is improved.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display device before bending according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of another flexible display device provided in an embodiment of the present invention;
fig. 4 is a schematic top view of a flexible display device according to an embodiment of the present invention;
fig. 5 is a schematic cross-sectional structure diagram of a flexible display device according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of another flexible display device according to an embodiment of the present invention;
fig. 7 is a flowchart of a method for manufacturing a flexible display device according to an embodiment of the present invention;
fig. 8 is a flowchart of another method for manufacturing a flexible display device according to an embodiment of the present invention;
fig. 9 is a schematic flow structure diagram of another method for manufacturing a flexible display device according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of another flexible display device according to an embodiment of the present invention;
fig. 11 is a schematic flow chart structure diagram of a manufacturing method of a flexible display device according to an embodiment of the present invention;
fig. 12 is a flowchart of a method for manufacturing a flexible display device according to another embodiment of the present invention;
fig. 13 is a flowchart of a method for manufacturing a flexible display device according to an embodiment of the present invention;
fig. 14 to fig. 18 are schematic flow structure diagrams of a manufacturing method of a flexible display device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
The flexible display device has the variable and bendable performance, so that the flexible display device can be bent, and the bending area of the flexible display device is provided with the bending protective layer, so that the parts of the bending area of the flexible display device are protected in the bending process. However, the bending protective layer is applied before the display device is bent, and the bending protective layer has a certain tensile strain after the display device is bent. And when the protective layer of buckling is in tensile state for a long time, can take place the creep, permanent deformation appears, and its tensile modulus reduces, reduces the protective capacities in flexible display device bending zone, can't implement the guard action to the part in flexible display device bending zone to make the flexible display device of flexible display device and the distribution that flexible display device bending zone set up take place the crackle, and then influence flexible display device's display effect.
To solve the above problems, fig. 1 is a schematic structural diagram of a flexible display device before being bent according to an embodiment of the present invention. As shown in fig. 1, the flexible display device 100 includes a flexible substrate 10, the flexible substrate 10 having a first flat region 11, a bending region 13, and a second flat region 12; after the flexible substrate 10 of the flexible display device 100 is bent, the first flat region 11 and the second flat region 12 are disposed opposite to each other, and the bent region 13 connects the first flat region 11 and the second flat region 12. After the flexible substrate 10 is bent, the bending region 13 is located between the first flat region 11 and the second flat region 12.
The first flat area 11 and the second flat area 12 of the flexible substrate 10 may be provided with a plurality of pixel units of the flexible display device 100, so as to implement double-sided display or curved-surface display of the flexible display device; alternatively, the first flat region 11 of the flexible substrate 10 may be provided with a plurality of pixel units of the flexible display device 100, and the second flat region 12 may be used to bind an integrated chip, a circuit board, and the like of the flexible display device 100 to realize a narrow bezel of the flexible display device 100.
Before the flexible substrate 10 of the flexible display device 100 is bent, the flexible display device 100 further includes a first bending protection layer 20 at least in the bending region 13 of the flexible substrate 10. The first bending protection layer 20 has a certain elastic deformation capability, and when the flexible substrate 10 of the flexible display device 100 is bent, the bending difficulty of the flexible substrate 10 can be reduced, and the bending stress applied when the flexible substrate 10 is bent is reduced, so that the flexible substrate 10 is prevented from generating cracks and the like, and the bending region 13 of the flexible substrate 10 is protected. Wherein, the first bending protection layer comprises an ultraviolet light curing glue layer.
In addition, after the flexible substrate 10 of the flexible display device 100 is bent, at least the bending region 13 of the flexible substrate 10 is provided with a second bending protection layer (not shown in the figure), which may be located on a side of the first bending protection layer 20 away from the flexible substrate, or on a side of the flexible substrate 10 away from the first bending protection layer 20, and an elastic modulus of the second bending protection layer is greater than an elastic modulus of the first bending protection layer 10. On the premise that the elastic modulus of the second bending protection layer is greater than that of the first bending protection layer 10, the second bending protection layer comprises an ultraviolet curing adhesive layer or a thermosetting adhesive layer.
In the flexible display device 100 of the embodiment, by bending the flexible substrate 10 of the flexible display device 100, the non-display region of the flexible display device 100 can be bent to the back of the display surface only, so as to reduce the frame area of the flexible display device 100; alternatively, the flexible display device 100 may be flexible, so that the flexible substrate 10 may be used to display a curved screen or a double-sided screen. Before the flexible substrate 10 is bent, the first bending protective layer 20 at least covering the bending region 13 of the flexible substrate 10 is arranged on the flexible substrate 10 to protect the bending region 13 of the flexible substrate 10 in the bending process, and after the flexible substrate is bent, a second bending protective layer is arranged at least on the bending region 13 of the flexible substrate 10; on the other hand, the second bending protection layer in the zero strain state can prevent the strain of the first bending protection layer 20 from increasing and reduce the stress applied to the bending region 13 of the flexible substrate 10 when the first bending protection layer creeps, so as to provide a protection effect for the bending region of the flexible substrate 10. Meanwhile, the elastic modulus of the second bending protection layer is greater than that of the first bending protection layer 20, and it can be known that the difficulty of elastic deformation of the second bending protection layer is greater than that of the first bending protection layer 20, so that when the first bending protection layer 20 creeps, the second bending protection layer can prevent the first bending protection layer 20 from continuing to deform, and therefore the phenomenon that the display effect of the flexible display device is affected due to cracks in the bending area 13 of the flexible substrate 10 caused by deformation of the first bending protection layer 20 can be prevented.
It should be noted that, in the embodiment of the present invention, the second bending protection layer of the flexible display device can perform a supplementary protection function on the bending region protected by the first bending protection layer, and a relative position of the second bending protection layer and the first bending protection layer can be correspondingly adjusted according to actual needs.
Optionally, fig. 2 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention. As shown in fig. 2, the first bending protection layer 20 is located on a side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100; the second bending protection layer 30 is located on the side of the first bending protection layer 20 facing away from the flexible substrate 10.
In particular, the flexible substrate 10 of the flexible display device 100 is usually bent toward the back side of the flexible display device 100 (the side facing away from the display surface 110 in the flexible display device 100) to realize a narrow bezel or curved display of the flexible display device 100. When the flexible substrate 10 of the flexible display device 100 is bent, the bending region 13 on the display surface 110 side of the flexible display device 100 is subjected to a large tensile stress, so that the risk of breaking the bending region 13 of the flexible substrate 10 of the display surface 110 is large. Before the flexible substrate 10 is bent, the first bending protective layer 20 is arranged on one side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100, and the first bending protective layer 20 at least covers the bending area 13 of the flexible substrate 10, so that the bending difficulty of the flexible substrate 10 is reduced, the bending stress borne by the flexible substrate 10 during bending is reduced, cracks and the like generated by the flexible substrate 10 during bending are prevented, and the bending area 13 of the flexible substrate 10 is protected.
After the flexible substrate 10 is bent, the first bending protection layer 20 of the bending region 13 in the flexible substrate 10 is in a stretched state, and the first bending protection layer 20 may creep due to a long-time stretched state. After the flexible substrate 10 is bent, a second bending protection layer 30 is arranged on one side of the first bending protection layer 20, which is far away from the flexible substrate 10, and the second bending protection layer 30 at least covers the bending area 13 of the flexible substrate 10. The second bending protection layer 30 formed after the flexible substrate 10 is bent has a smaller strain or is in a zero strain state, so that the second bending protection layer 30 does not creep, and when the first bending protection layer 20 creeps, the stress borne by the bending area 13 of the flexible substrate 10 can be reduced through the second bending protection layer 30, so that the flexible substrate 10 is prevented from generating cracks, and the flexible substrate 10 is protected.
Optionally, fig. 3 is a schematic structural diagram of another flexible display device provided in an embodiment of the present invention. As shown in fig. 3, the flexible display device 100 further comprises a cover plate 40, the cover plate 40 is located on a side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100; the gap between the bending region 13 and the cover plate 40 is provided with a second bending protection layer 30.
In particular, the cover plate 40 can prevent the device of the display surface 110 in the flexible display device 100 from being damaged by impact, and provide protection for the flexible display device 100. After the flexible display device 100 is bent, since the bending region 13 of the flexible substrate 10 has a certain bending radian, a gap is formed between the cover plate 40 and the flexible substrate 10, so that the bending region 13 of the flexible substrate 10 is unsupported, which will affect the mechanical properties of the flexible substrate 10. The second bending protection layer 30 disposed after the flexible display device 100 is bent covers the bending region 13 of the flexible substrate 10 and fills a gap between the cover plate 40 and the bending region 13. On one hand, the second bending protection layer 30 can provide a protection effect for the flexible substrate 10 after the first bending protection layer 30 creeps; on the other hand, the second bending protection layer 30 contacts the cover plate 40 and fills the gap between the cover plate 40 and the bending region 13, so as to provide a supporting function for the bending region of the flexible substrate 10, so as to fix the flexible substrate 10 and enhance the mechanical properties of the flexible substrate 10. In addition, optionally, a functional film layer 50 is further disposed between the cover plate 40 and the first flat region 11 of the flexible substrate 10, and the functional film layer 50 may be a polarizer, a touch layer, or the like.
Alternatively, referring to fig. 2 and 3, the perpendicular projection of the first bending protection layer 20 on the flexible substrate 10 of the flexible display device 100 covers the perpendicular projection of the second bending protection layer 30 on the flexible substrate 10. That is, the area of the first bending protection layer 20 covering the flexible substrate 10 is larger than the area of the second bending protection layer 30 covering the flexible substrate 10, for example, the second bending protection layer 30 may be coated only in the bending region 13, so as to save raw materials and reduce the cost of the flexible display device 100 on the premise of protecting the bending region 13. Meanwhile, before bending, the first bending protection layer 20 arranged on the flexible substrate 10 can reduce the bending difficulty and reduce the bending stress borne by the flexible substrate 10 when bending, and in order to prevent the stress mutation at each position when bending the flexible substrate 10, the area of the first bending protection layer 20 can be set to be at least larger than the area of the bending region 13 of the flexible substrate 10; after bending, the flexible substrate 10 and the first bending protection layer 20 in the bending region 13 have large strain, and the flexible substrate 10 and the first bending protection layer 20 in the first flat region 11 and the second flat region 12 have small strain or zero strain, so that the second bending protection layer 30 may be disposed only in the bending region with large strain to prevent the stress strain of the flexible substrate 10 and the first bending protection layer 20 in the bending region 13 from further increasing, and provide a protection effect for the flexible substrate 10.
Optionally, with continued reference to fig. 2 and fig. 3, the first bending protection layer 20 and the second bending protection layer 30 are both planar structures, so as to provide a protection function for the bending region 13 to the maximum extent and prevent the flexible substrate 10 from breaking.
Optionally, fig. 4 is a schematic top view structure diagram of a flexible display device according to an embodiment of the present invention. As shown in fig. 4, in the present embodiment, the first bending protection layer 20 of the flexible display device 100 is a planar structure, so as to reduce the stress of the bending region 13 and reduce the bending difficulty during bending; the second bending protection layer 30 is a strip structure, that is, the second bending protection layer 30 includes at least one sub-bending protection strip 31, so that on the premise of providing a protection effect for the bending region 13, raw materials are saved, the cost of the flexible display device 100 is reduced, and the manufacturing process is simplified.
Optionally, fig. 5 is a schematic cross-sectional structure diagram of a flexible display device according to an embodiment of the present invention. With reference to fig. 4 and 5, the length L' of the sub-bending protection strip 31 is greater than or equal to the length L of the bending arc of the bending region 13; wherein the length L of the bending arc is the product of the bending radius R of the bending region 13 and the bending angle θ of the bending region 13.
Specifically, after the flexible display device 100 is bent, the length L' of the sub-bending protection bar 31 of the second bending protection layer 30 is greater than or equal to the length L of the bending arc of the bending region 13, which is as follows:
L′≥L＝R×θ
where R is the bending radius of bending region 13 and θ is the bending angle of bending region 13. The force F provided by the sub-bending protection strip 31 of the second bending protection layer 30 to prevent the bending region 13 from deforming at least has a component Fx in the bending direction of the bending region 13, so that raw materials can be saved and the cost of the flexible display device 100 can be reduced on the premise of providing a certain protection effect for the bending region 13.
Optionally, fig. 6 is a schematic structural diagram of another flexible display device provided in an embodiment of the present invention. As shown in fig. 6, the first bending protection layer 20 of the flexible display device 100 is located on the side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100 in the bending region 13; the second bending protection layer 30 is located on a side of the flexible substrate 10 of the bending region 13 facing away from the display surface 110 of the flexible display device 100.
Specifically, the first bending protection layer 20 disposed before the flexible substrate 10 is bent is located on one side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100, and the second bending protection layer 30 disposed after the flexible substrate 10 is bent is located on one side of the flexible substrate 10 departing from the first bending protection layer 20. The first bending protection layer 20 can reduce the bending difficulty and provide a protection effect for the bending region 13 during bending. After the flexible substrate 10 is bent, the first bending protection layer 20 is kept in a stretched state, and may creep over time, and the neutral surface of the first bending protection layer 20 moves toward the flexible substrate 10, so that the protection effect of the first bending protection layer 20 on the bending region 13 is reduced. After the flexible substrate 10 is bent, the second bending protection layer 30 is arranged on one side of the flexible substrate 10, which is far away from the first bending protection layer 20, and the second bending protection layer 30 has smaller strain or zero strain, so that when the neutral surface of the first bending protection layer 30 moves downwards, a tensile stress is provided for the bending area 13, so that the neutral surface of the first bending protection layer 20 is prevented from moving downwards, and a protection effect is further provided for the bending area 13.
Optionally, with continued reference to fig. 6, the side of the first flat region 11 of the flexible substrate 10 facing the second flat region 12 is provided with a first support plate 71; a second support plate 72 is arranged on one side of the second flat area 12 facing the first flat area 11; an adhesive layer 60 is provided between the first support plate 71 and the second support plate 72; the second bending protection layer 30 is disposed in the gap between the first support plate 71, the second support plate 72, and the bonding layer 60 adjacent to the bending region 13 and the bending region 13.
Specifically, the first support plate 71 and the second support plate 72 disposed in the first flat region 11 and the second flat region 12 of the flexible substrate 10 can provide a support function for the flexible substrate 10, so as to prevent the flat regions of the flexible substrate 10 from bending and deforming, which may affect the display. The adhesive layer 60 disposed between the first support plate 71 and the second support plate 72 can play a certain role of raising to increase the bending radius of the bending region 13 and prevent the bending region 13 from breaking due to a smaller bending radius, and on the other hand, can fix the positions of the first support plate 71 and the second support plate 72 to keep the flexible substrate 10 in a bent state. After bending, the second bending protection layer 30 is filled in the first support plate 71, the second support plate 72 and the gap between the bonding layer 60 and the bending area 13, so that when the first bending protection layer 30 creeps to cause the neutral surface of the first bending protection layer to move downwards, a tensile stress is provided for the bending area 13 to prevent the neutral surface of the first bending protection layer 20 from moving downwards, and further, a protection effect is provided for the bending area 13; meanwhile, after the gaps between the first support plate 71, the second support plate 72 and the bonding layer 60 and the bending area 13 are filled, the bending area 13 can be supported, and the bending area 13 is prevented from being deformed due to external impact.
The second bending protection layer 30 may be extended into a side of the flexible substrate 10 away from the display surface 110 through a needle structure, and the second bending protection layer 30 is formed by filling a fluid material, such as a gel material, a liquid material, etc., of the second bending protection layer 30 into the first support plate 71, the second support plate 72, and a gap between the adhesive layer 60 and the bending region 13 in a spraying or injecting manner, and curing the fluid material. Furthermore, optionally, a functional layer (not shown in the figure) may be disposed between the first support plate 71 and the second support plate 72 of the flexible display device 100, and the functional layer may be, for example, a functional layer for preventing static electricity and/or dissipating heat.
The embodiment of the invention also provides a preparation method of the flexible display device, and the preparation method of the flexible display device can be suitable for preparing the flexible display device provided by the embodiment of the invention. Fig. 7 is a flowchart of a method for manufacturing a flexible display device according to an embodiment of the present invention. As shown in fig. 7, the method for manufacturing the flexible display device of the present embodiment includes:
s710, providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first straight area and the second straight area.
In particular, referring to fig. 1, the flexible substrate 10 is the basis of a bendable variant of the flexible display device 100. The flexible substrate 10 has a first flat area 11, a second flat area 12, and a bending area 13, and a plurality of pixel units of the flexible display device 100 can be disposed in the first flat area 11 and the second flat area 12 of the flexible substrate 10, so as to implement double-sided display or curved display of the flexible display device after bending; alternatively, the first flat region 11 of the flexible substrate 10 may be provided with a plurality of pixel units of the flexible display device 100, and the second flat region 12 may be used to bond an integrated chip, a circuit board, etc. of the flexible display device 100 to realize a narrow bezel of the flexible display device 100 after bending.
S720, forming a first bending protection layer at least in the bending area.
Specifically, with continued reference to fig. 1, the hard film layer such as metal wiring disposed in the bending region 13 of the flexible substrate 100 increases the difficulty of bending the flexible substrate 10. The first bending protection layer 20 with certain elastic strain capacity can be formed in the bending region 13 of the flexible substrate 10, so that when the bending region 13 is bent, the bending difficulty can be reduced, the bending stress borne by the bending region 13 is reduced, the flexible substrate 10 is prevented from generating cracks and the like, and the bending region 13 of the flexible substrate 10 is protected. The ultraviolet curing adhesive layer may be formed by ultraviolet curing to serve as the first bending protection layer 20.
And S730, bending the second straight area to one side of the first straight area, which is far away from the display surface of the flexible display device, through the bending area, so that the first straight area and the second straight area are oppositely arranged.
Specifically, with reference to fig. 1, after the first bending protection layer 20 is formed on the bending region 13, the second straight region 11 is bent to a side of the first straight region 11 away from the display surface 110 of the flexible display device 100 through the bending region 13, so that the first straight region 11 and the second straight region 12 are disposed opposite to each other. If the second flat region 12 is a non-display region of the flexible display device 100, a narrow bezel of the flexible display device 100 can be realized by bending the flexible substrate 10; if both the first flat region 11 and the second flat region 12 can display, the flexible display device 100 can achieve a curved surface or double-sided display effect by bending the flexible substrate 10.
S740, forming a second bending protection layer at least in the bending area; the elastic modulus of the second bending protection layer is larger than that of the first bending protection layer.
In particular, with continued reference to fig. 1, creep may occur over time as the first bending protection layer 20 remains in a strained state after the flexible display device 100 is bent. After the flexible substrate 10 of the flexible display device 100 is bent, at least a second bending protection layer (not shown in the figure) is formed in the bending region 13 of the flexible substrate 10, and the second bending protection layer has a smaller strain or is in a zero-strain state, and does not creep with the time extension, so that the strain of the first bending protection layer 20 can be prevented from further increasing, and further the stress borne by the bending region 13 of the flexible substrate 10 is reduced, thereby providing a protection effect for the bending region of the flexible substrate 10. In addition, the elastic modulus of the second bending protection layer is greater than that of the first bending protection layer 20, that is, the difficulty of elastic deformation of the second bending protection layer is greater than that of the first bending protection layer 20, so that when the first bending protection layer 20 creeps, the second bending protection layer can prevent the first bending protection layer 20 from continuing to deform, and therefore the phenomenon that the display effect of the flexible display device is affected due to cracks appearing in the bending area 13 of the flexible substrate 10 due to deformation of the first bending protection layer 20 can be prevented. The second bending protection layer can be formed through ultraviolet light curing or thermal curing.
This embodiment can reduce the degree of difficulty of buckling through the first protective layer of buckling of bending district formation before the flexible substrate buckles to buckle the district formation second protective layer of buckling after the flexible substrate buckles, with the bending district that is in the state of buckling provides the guard action, improves flexible display device's display effect.
Optionally, the first bending protection layer and the second bending protection layer of the bending region may be located at a side of the flexible substrate facing the display surface of the flexible display device, and the second bending protection layer is located at a side of the first bending protection layer facing away from the flexible substrate. Fig. 8 is a flowchart of another method for manufacturing a flexible display device according to an embodiment of the present invention. As shown in fig. 8, the method for manufacturing the flexible display device of the present embodiment includes:
s910, providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first flat area and the second flat area;
and S920, forming the first bending protection layer on one side, facing the display surface of the flexible display device, of the flexible substrate in the bending area.
Specifically, as shown in fig. 9, since the flexible substrate 10 of the flexible display device 100 is usually bent toward the back surface of the flexible display device 100 (the side away from the display surface 110 of the flexible display device 100) to implement narrow bezel or curved surface display of the flexible display device 100, the bending region 13 on the side of the display surface 110 of the flexible display device 100 is subjected to a larger tensile stress. The first bending protection layer 20 is formed on one side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100, and the first bending protection layer 20 at least covers the bending area 13 of the flexible substrate 10, so that when the flexible substrate 10 is bent, the bending difficulty of the flexible substrate 10 is reduced, the bending stress borne by the flexible substrate 10 when the flexible substrate 10 is bent is reduced, cracks and the like generated in the flexible substrate 10 when the flexible substrate 10 is bent are prevented, and the bending area 13 of the flexible substrate 10 is protected.
S930, bending the second flat area to one side, away from the display surface of the flexible display device, of the first flat area through the bending area, so that the first flat area and the second flat area are oppositely arranged;
and S940, forming the second bending protection layer on one side, away from the flexible substrate, of the first bending protection layer.
Specifically, with reference to fig. 9, after the flexible substrate 10 is bent, a second bending protection layer 30 is formed on a side of the first bending protection layer 20 away from the flexible substrate 10, and the second bending protection layer 30 at least covers the bending region 13 of the flexible substrate 10. At this time, the formed second bending protection layer 30 has a smaller strain or is in a zero strain state, and the second bending protection layer 30 can further reduce the stress applied to the bending region 13 of the flexible substrate 10, prevent the flexible substrate 10 from generating cracks, and protect the flexible substrate 10.
Optionally, a cover plate of the flexible display device is further disposed on one side of the display surface of the flexible display device, and the cover plate of the flexible display device can have certain impact resistance so as to provide a certain protection effect for the flexible display device. The cover plate can be formed before or after the flexible substrate is bent, and the embodiment takes the cover plate of the flexible display device formed before bending as an example for description. Fig. 10 is a schematic structural diagram of another flexible display device according to an embodiment of the present invention. As shown in fig. 10, the method for manufacturing the flexible display device of this embodiment includes:
s1110 providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first flat area and the second flat area;
s1120, forming the first bending protection layer on one side, facing to the display surface of the flexible display device, of the flexible substrate in the bending area;
s1130, providing a cover plate;
s1140, attaching the cover plate to one side of the flexible substrate facing the display surface of the flexible display device;
s1150, bending the second flat area to one side of the first flat area, which is far away from the display surface of the flexible display device, through the bending area, so that the first flat area and the second flat area are oppositely arranged;
s1160, forming the second bending protection layer on one side, away from the flexible substrate, of the first bending protection layer, and filling a gap between the bending area and the cover plate with the second bending protection layer.
Specifically, referring to fig. 11, after the first bending protection layer 20 is formed in the bending region 13 on the display surface 110 side of the flexible display device 100, the cover 40 is attached to the side of the flexible substrate 10 facing the display surface 110 of the flexible display device 100, and the cover 40 can prevent the devices of the display surface 110 in the flexible display device 100 from being damaged by impact, so as to provide a protection effect for the flexible display device 100. Before the cover 40 is attached to the flexible substrate 10 on the side facing the display surface 110 of the flexible display device 100, a functional layer 50 is formed on the flexible substrate 10 on the side facing the display surface 110 of the flexible display device 100, and the functional layer 50 may be a polarization functional layer, a touch functional layer, or the like.
After the flexible display device 100 is bent, a gap 41 is formed between the cover plate 40 and the flexible substrate 10, and the second bending protection layer 30 is formed in the bending region 13 of the flexible substrate 10 and fills the gap 41 between the cover plate 40 and the bending region 13, so that a protection effect on the flexible substrate 10 and a supporting effect on the bending region of the flexible substrate 10 can be provided, the flexible substrate 10 is fixed, and the mechanical performance of the flexible substrate 10 is enhanced.
Optionally, the first bending protection layer and the second bending protection layer of the bending region may be located at a side of the flexible substrate facing the display surface of the flexible display device, where the first bending protection layer is formed, and the second bending protection layer is formed at a side of the flexible substrate facing away from the display surface of the flexible display device. Fig. 12 is a flowchart of a method for manufacturing a flexible display device according to another embodiment of the present invention. As shown in fig. 12, the method for manufacturing the flexible display device of the present embodiment includes:
s1310, providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first flat area and the second flat area;
s1320, forming the first bending protection layer on one side, facing to the display surface of the flexible display device, of the flexible substrate in the bending area;
s1330, bending the second flat region to a side of the first flat region away from the display surface of the flexible display device through the bending region, so that the first flat region and the second flat region are opposite to each other;
s1340, forming the second bending protection layer on one side, deviating from the display surface of the flexible display device, of the flexible substrate in the bending area.
Specifically, referring to fig. 1, before the second flat region 12 is bent to the side of the first flat region 11 away from the display surface 110 of the flexible display device 100 through the bending region 13, a first bending protection layer 20 is formed on the side of the flexible substrate 10 of the bending region 13 facing the display surface 110 of the flexible display device 100, so as to reduce the bending difficulty of the flexible substrate during bending. After the second flat region 12 is bent to the side of the first flat region 11 away from the display surface 110 of the flexible display device 100 through the bending region 13, a second bending protection layer is formed on the side of the flexible substrate 10 of the bending region 13 away from the display surface 110 of the flexible display device 100. The second bending protection layer can provide a tensile stress to prevent the neutral surface of the first bending protection layer 20 from moving towards the direction of the first bending protection layer 20 towards the flexible substrate 10, and further provide a protection effect for the bending region 13.
Optionally, since the flexible substrate has a feature of being bendable, in order to keep the first flat region and the second flat region of the flexible substrate in a planar state, before forming the first bending protection layer at least in the bending region, corresponding support plates are required to be disposed in the first flat region and the second flat region of the flexible substrate. Fig. 13 is a flowchart of a method for manufacturing a flexible display device according to an embodiment of the present invention. As shown in fig. 13, the method for manufacturing the flexible display device of the present embodiment includes:
s1510, providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first flat area and the second flat area;
s1520, attaching a first support plate to one side of the first flat region of the flexible substrate, which is away from the display surface of the flexible display device, and attaching a second support plate to one side of the second flat region of the flexible substrate, which is away from the display surface of the flexible display device.
Specifically, as shown in fig. 14, a first support plate 71 and a second support plate 72 are formed in the first flat region 11 and the second flat region 12 of the flexible substrate 10, respectively. The first support plate 71 and the second support plate 72 are both formed on a side of the flexible substrate 10 facing away from the display surface 110 of the flexible display device 100 to ensure that the flexible display device 100 can still display normally when the first support plate 71 and the second support plate 72 are arranged. The first support plate 71 and the second support plate 72 can be formed at the same time, so that the preparation process is reduced, and the cost is reduced.
S1530, forming an adhesive layer on the first support plate; after the second flat area is bent to the side, away from the display surface of the flexible display device, of the first flat area through the bending area, the bonding layer is located between the first support plate and the second support plate;
specifically, as shown in fig. 15, after the first support plate 71 and the second support plate 72 are formed, the adhesive layer 60 is formed on the first support plate 71. As shown in fig. 17, the adhesive layer 60 is located between the first support plate 71 and the second support plate 72 after bending the second flat region 12 to the side of the first flat region 11 facing away from the display surface 110 of the flexible display device 100 through the bending region 13. The adhesive layer 60 has a function of raising, so as to increase the bending radius of the bending area 13 and prevent the bending area 13 from being broken due to a smaller bending radius. Meanwhile, the adhesive layer 60 can fix the positions of the first and second support plates 71 and 72 to maintain the flexible substrate 10 in a bent state.
S1540, forming the first bending protection layer on one side, facing the display surface of the flexible display device, of the flexible substrate in the bending area;
s1550, bending the second flat area to one side, away from the display surface of the flexible display device, of the first flat area through the bending area, so that the first flat area and the second flat area are oppositely arranged;
s1560, filling gaps among the first support plate, the second support plate and the bonding layer, which are close to one side of the bending area, and the bending area with the second bending protection layer.
Specifically, as shown in fig. 16, before the second flat region 12 is bent to a side of the first flat region 11 away from the display surface 110 of the flexible display device 100 through the bending region 13, a first bending protection layer 20 is formed to reduce the bending difficulty and reduce the stress applied to the bending region 13 during bending. As shown in fig. 17, after the second flat region 12 is bent to the side of the first flat region 11 away from the display surface 110 of the flexible display device 100 by the bending region 13, the first support plate 71, the second support plate 72, and the adhesive layer 60 have a gap 61 with the bending region. As shown in fig. 18, the second bending protection layer 30 is filled in the gap 61 to provide tensile stress to the bending region 13, so as to prevent the neutral plane of the first bending protection layer 20 from moving downwards, and further provide protection for the bending region 13; meanwhile, after the gaps between the first support plate 71, the second support plate 72 and the bonding layer 60 and the bending area 13 are filled, the bending area 13 can be supported, and the bending area 13 is prevented from being deformed due to external impact.
Alternatively, with continued reference to fig. 17 and 18, the first support, 71, the second support plate 72, and the gap 61 between the adhesive layer 60 and the bending region 13 may be filled with the second bending protection layer 30 by injecting the fluid material of the second bending protection layer 30 through the needle-like structure into the gap 61 between the bending region 13 and the side of the first support plate 71, the second support plate 72, and the adhesive layer 60 adjacent to the bending region 13; and solidifying the sprayed fluid material of the second bending protection layer 30 to form the second bending protection layer 30. The second bending protection layer 30 may include a thermosetting adhesive layer, for example. Illustratively, the second bending protection layer 30 is formed by injecting thermosetting glue into the gap 61 and then curing the thermosetting glue by heating.
According to the embodiment of the invention, the first bending protection layer is arranged in the bending area of the flexible substrate before bending, so that the bending difficulty is reduced, and the bending stress is reduced; the second bending protective layer is arranged in the bending area of the flexible substrate after bending, and creep deformation of the first bending protective layer after bending can be prevented, so that the phenomenon that the wiring arranged on the flexible substrate and the flexible substrate cracks due to the fact that the protective capacity of the first bending protective agent for the wiring layer arranged on the flexible substrate and the flexible substrate is reduced is prevented, and the display effect of the flexible display device is improved.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (14)
1. A flexible display device, comprising:
a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the first flat area and the second flat area are arranged oppositely; the bending area is connected with the first flat area and the second flat area;
the first bending protective layer is at least positioned in the bending area;
the second bending protective layer is at least positioned in the bending area;
the elastic modulus of the second bending protection layer is greater than that of the first bending protection layer;
the first bending protection layer is positioned on one side of the flexible substrate facing the display surface of the flexible display device; the second bending protection layer is positioned on one side of the first bending protection layer, which is far away from the flexible substrate;
or the first bending protection layer is positioned on one side, facing the display surface of the flexible display device, of the flexible substrate in the bending area; the second bending protection layer is positioned on one side, away from the display surface of the flexible display device, of the flexible substrate in the bending area;
after the second straight area is bent to the side, away from the display surface of the flexible display device, of the first straight area through the bending area, the first straight area and the second straight area are oppositely arranged, and then a second bending protective layer is formed at least in the bending area; the second bending protection layer is in a zero-strain state so as to prevent the first bending protection layer from creeping after bending.
2. The flexible display device of claim 1, wherein the first bending protection layer is located on a side of the flexible substrate facing a display surface of the flexible display device; the second bending protection layer is positioned on one side of the first bending protection layer, which is far away from the flexible substrate; the flexible display device further comprises a cover plate; the cover plate is positioned on one side of the flexible substrate facing the display surface of the flexible display device; and the second bending protective layer is arranged in a gap between the bending area and the cover plate.
3. The flexible display device according to claim 1, wherein the first bending protection layer is located on a side of the flexible substrate of the bending region facing a display surface of the flexible display device; the second bending protection layer is positioned on one side, away from the display surface of the flexible display device, of the flexible substrate in the bending area; a first supporting plate is arranged on one side, facing the second straight area, of the first straight area; a second supporting plate is arranged on one side, facing the first straight area, of the second straight area; a bonding layer is arranged between the first supporting plate and the second supporting plate;
the second bending protection layer is positioned in the first supporting plate, the second supporting plate and the gap between one side of the bonding layer close to the bending area and the bending area.
4. The flexible display device of claim 1, wherein a perpendicular projection of the first bending protection layer on the flexible substrate covers a perpendicular projection of the second bending protection layer on the flexible substrate.
5. The flexible display device of claim 1, wherein the first and second bending protection layers are both planar structures.
6. The flexible display device of claim 1, wherein the first bending protection layer is a planar structure; the second bending protection layer comprises at least one sub-bending protection strip.
7. The flexible display device of claim 6, wherein the length of the sub-bending protection bar is equal to or greater than the length of the bending arc of the bending region;
the length of the bending arc is the product of the bending radius R of the bending area and the bending angle theta of the bending area.
8. The flexible display device of claim 1, wherein the first bending protection layer comprises an ultraviolet light curing glue layer; the second bending protective layer comprises an ultraviolet curing adhesive layer or a thermosetting adhesive layer.
9. A method for manufacturing a flexible display device according to any one of claims 1 to 8, comprising:
providing a flexible substrate; the flexible substrate comprises a first flat area, a bending area and a second flat area; the bending area is connected with the first flat area and the second flat area;
forming a first bending protection layer at least in the bending area;
bending the second flat area to one side of the first flat area, which is far away from the display surface of the flexible display device, through the bending area, so that the first flat area and the second flat area are oppositely arranged;
forming a second bending protection layer at least in the bending area; the second bending protection layer is in a zero-strain state;
the elastic modulus of the second bending protection layer is larger than that of the first bending protection layer.
10. The method of manufacturing a flexible display device according to claim 9,
at least forming a first bending protection layer in the bending area, comprising:
forming the first bending protection layer on one side, facing the display surface of the flexible display device, of the flexible substrate in the bending area;
at least in the bending zone forms the second protection layer that buckles, include:
and forming the second bending protective layer on one side of the first bending protective layer, which is far away from the flexible substrate.
11. The method for manufacturing a flexible display device according to claim 10, further comprising, before forming a second bending protection layer at least in the bending region:
providing a cover plate;
attaching the cover plate to one side of the flexible substrate facing the display surface of the flexible display device;
at least form the second protection layer of buckling in the district of buckling, still include:
and filling the gap between the bending region and the cover plate with the second bending protection layer.
12. The method of manufacturing a flexible display device according to claim 9,
at least forming a first bending protection layer in the bending area, comprising:
forming the first bending protection layer on one side, facing the display surface of the flexible display device, of the flexible substrate in the bending area;
forming a second bending protection layer at least in the bending area, comprising:
and forming the second bending protective layer on one side of the flexible substrate of the bending area, which is deviated from the display surface of the flexible display device.
13. The method for manufacturing a flexible display device according to claim 12, further comprising, before forming the first bending protection layer at least in the bending region:
attaching a first support plate to one side, away from the display surface of the flexible display device, of the first flat area of the flexible substrate;
attaching a second support plate to one side, away from the display surface of the flexible display device, of the second flat area of the flexible substrate;
and forming an adhesive layer on the first support plate; after the second flat area is bent to the side, away from the display surface of the flexible display device, of the first flat area through the bending area, the bonding layer is located between the first support plate and the second support plate;
forming a second bending protection layer at least in the bending area, comprising:
and filling the first support plate, the second support plate and a gap between one side of the bonding layer close to the bending area and the bending area with the second bending protective layer.
14. The method of claim 13, wherein filling the gap with the second bending protection layer comprises
Injecting the fluid material of the second bending protection layer through a needle-shaped structure penetrating into the first support plate, the second support plate and a gap between one side of the bonding layer close to the bending region and the bending region;
and solidifying the sprayed fluid material of the second bending protection layer to form the second bending protection layer.
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| CN110491288B (en) * | 2019-07-25 | 2021-09-03 | 武汉华星光电半导体显示技术有限公司 | Display panel |
| CN110634399B (en) * | 2019-08-22 | 2020-12-25 | 武汉华星光电半导体显示技术有限公司 | Flexible cover plate, flexible display device and manufacturing method of flexible cover plate |
| CN110473474B (en) * | 2019-08-29 | 2022-02-01 | 上海天马微电子有限公司 | Manufacturing method of bending structure, bending structure and display panel |
| CN110515499B (en) * | 2019-08-30 | 2023-06-20 | 京东方科技集团股份有限公司 | Touch panel and touch display device |
| CN110782788B (en) * | 2019-10-14 | 2021-09-03 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and display device |
| CN111445795A (en) * | 2020-03-24 | 2020-07-24 | 维沃移动通信有限公司 | Display screen and electronic equipment |
| CN111681543B (en) * | 2020-04-26 | 2022-10-25 | 京东方科技集团股份有限公司 | Display panel, preparation method thereof and display device |
| CN111509017B (en) * | 2020-04-28 | 2024-04-16 | 京东方科技集团股份有限公司 | Flexible display substrate, preparation method thereof and flexible display panel |
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| CN114787697B (en) * | 2020-09-30 | 2023-09-08 | 京东方科技集团股份有限公司 | Method for manufacturing display device and display device |
| CN112599538A (en) * | 2020-12-11 | 2021-04-02 | 武汉华星光电半导体显示技术有限公司 | Flexible display screen, preparation method thereof and flexible display device |
| CN112959804B (en) * | 2021-04-14 | 2024-04-09 | 京东方科技集团股份有限公司 | Curved surface screen bending equipment and curved surface screen bending method |
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