CN109411520B - Flexible display panel and display device - Google Patents
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- CN109411520B CN109411520B CN201811243757.8A CN201811243757A CN109411520B CN 109411520 B CN109411520 B CN 109411520B CN 201811243757 A CN201811243757 A CN 201811243757A CN 109411520 B CN109411520 B CN 109411520B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The invention discloses a flexible display panel and a display device. A flexible display panel comprising: a flexible substrate; the array layer is positioned on the flexible substrate; the display layer is positioned on one side of the array layer, which is far away from the flexible substrate, and comprises a plurality of light-emitting devices; the flexible display panel comprises a bendable region, at least the bendable region is provided with a graphite composite layer, and the graphite composite layer comprises a graphite layer and a flexible film layer which are mutually overlapped; the graphite composite layer is provided with a neutral plane, and the neutral plane is positioned between the graphite layer and the flexible film layer or positioned on the flexible film layer. The invention can avoid the graphite layer bearing the pressure stress, thereby avoiding the interlayer stripping phenomenon of the graphite layer and ensuring the performance reliability of the flexible display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel and a display device.
Background
In the conventional display device technology, the display panel is mainly divided into two mainstream technologies, namely a liquid crystal display panel and an organic light emitting display panel. The liquid crystal display panel forms an electric field capable of controlling the deflection of liquid crystal molecules by applying voltage to two ends of the liquid crystal molecules, so that the transmission of light rays is controlled to realize the display function of the display panel; the organic light-emitting display panel adopts an organic electroluminescent material, and when current passes through the organic electroluminescent material, the luminescent material can emit light, so that the display function of the display panel is realized.
The organic light emitting display panel has advantages of self-luminescence, ultra-thinness, high contrast, ultra-wide viewing angle, low power consumption, high display brightness, bright color, and capability of manufacturing flexible display, and the like, and is a key point of attention.
Therefore, it is an urgent technical problem to be solved in the art to provide a flexible display panel and a display device with reliable performance.
Disclosure of Invention
In view of this, the present invention provides a flexible display panel and a display device, which solve the technical problem of improving performance reliability.
In a first aspect, the present invention provides a flexible display panel comprising:
a flexible substrate;
the array layer is positioned on the flexible substrate;
the display layer is positioned on one side of the array layer, which is far away from the flexible substrate, and comprises a plurality of light-emitting devices;
the flexible display panel comprises a bendable region, at least the bendable region is provided with a graphite composite layer, and the graphite composite layer comprises a graphite layer and a flexible film layer which are mutually overlapped; wherein the content of the first and second substances,
the graphite composite layer is provided with a neutral plane, and the neutral plane is positioned between the graphite layer and the flexible film layer or positioned on the flexible film layer.
Based on the same inventive concept, in a second aspect, the invention further provides a display device, which includes any one of the flexible display panels provided by the invention.
Compared with the prior art, the flexible display panel and the display device provided by the invention at least realize the following beneficial effects:
according to the flexible display panel, the graphite composite layer is arranged in the bending area, and the neutral surface of the graphite composite layer is positioned on the flexible film layer or between the graphite layer and the flexible film layer. The graphite layer is made of graphite materials, the graphite layer is of an interlayer structure, the binding force between carbon atoms on the same plane layer is strong and is extremely difficult to damage, and the layers are combined by intermolecular force, so that the binding force is weak. When the graphite layer bears the pressure stress, the layer stripping phenomenon can be generated between layers, and the structure between layers is basically not changed when the graphite layer bears the tensile stress. The invention can avoid the graphite layer bearing the pressure stress, thereby avoiding the interlayer stripping phenomenon of the graphite layer and ensuring the performance reliability of the flexible display panel. In addition, the graphite layer in the graphite composite layer has good heat-conducting property, when the flexible display panel displays, the light-emitting device in the display layer can generate heat, and the graphite layer can conduct heat quickly, so that the heat can be dissipated timely.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic diagram of a film structure of an alternative implementation of a flexible display panel according to an embodiment of the present invention;
fig. 2 is a schematic view of the flexible display panel shown in fig. 1 in a bent state;
FIG. 3 is a force diagram of the graphite composite layer shown in FIG. 2;
fig. 4 is a film layer structure diagram of another alternative implementation of the flexible display panel according to the embodiment of the present invention;
fig. 5 is a schematic view illustrating a bent state of the flexible display panel shown in fig. 4;
FIG. 6 is a schematic view of the graphite composite layer of FIG. 5 under stress;
FIG. 7 is a schematic diagram of another alternative implementation of a flexible display panel according to an embodiment of the invention;
FIG. 8 is a schematic diagram of another alternative implementation of a flexible display panel according to an embodiment of the invention;
FIG. 9 is a schematic diagram of another alternative implementation of a flexible display panel according to an embodiment of the invention;
FIG. 10 is a schematic diagram of another alternative implementation of a flexible display panel according to an embodiment of the invention;
fig. 11 is a schematic view of a display device according to an embodiment of the invention.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic diagram of a film structure of an alternative implementation of a flexible display panel according to an embodiment of the present invention. Fig. 2 is a schematic view of the flexible display panel shown in fig. 1 in a bent state. Fig. 3 is a force-bearing diagram of the graphite composite layer in fig. 2. Fig. 4 is a film layer structure diagram of another alternative implementation of the flexible display panel according to the embodiment of the present invention. Fig. 5 is a schematic view of the flexible display panel shown in fig. 4 in a bent state. FIG. 6 is a force-bearing diagram of the graphite composite layer shown in FIG. 5.
As shown in fig. 1, the flexible display panel includes: a flexible substrate 101; an array layer 102 on the flexible substrate 101; and a display layer 103 located on a side of the array layer 102 away from the flexible substrate 101, where the display layer 103 includes a plurality of light emitting devices 1031, and optionally, the light emitting devices 1031 may be organic light emitting devices including an anode, a light emitting layer, and a cathode.
The flexible display panel comprises a bendable region Z, the bendable region Z can be a partial region of the flexible display panel, or the whole surface of the flexible display panel can be bendable, at least the bendable region Z is provided with a graphite composite layer 104, and the graphite composite layer 104 comprises a graphite layer 1041 and a flexible film layer 1042 which are mutually stacked; that is, in the flexible display panel according to the present invention, the graphite composite layer 104 may be provided only in the bendable region Z, or the graphite composite layer 104 may be provided over the entire surface of the flexible display panel. While the relative positions of the graphite layer 1041 and the flexible membrane layer 1042 in the graphite composite layer 104 include two cases: that is, the graphite layer 1041 is located on the side of the flexible film layer 1042 close to the flexible substrate 101, or the flexible film layer 1042 is located on the side of the graphite layer 1041 close to the flexible substrate 101. In the flexible display panel provided by the invention, the graphite composite layer 104 has a neutral plane M1, the neutral plane M1 is located between the graphite layer 1041 and the flexible film layer 1042, or the neutral plane M1 is located on the flexible film layer 1042. In material mechanics, the neutral plane is a plane that bears neither tensile stress nor compressive stress.
Optionally, the flexible display panel further comprises an encapsulation structure, the encapsulation structure is located on one side, away from the array layer, of the display layer, the encapsulation structure surrounds and covers the display layer, the encapsulation structure can isolate water and oxygen, a protection effect is achieved on a light-emitting device in the display layer, and the service life of the light-emitting device is guaranteed. The encapsulation structure may be a thin film encapsulation including at least one organic encapsulation layer and at least one inorganic encapsulation layer. Film layer structures such as a polarizer, a protective film and the like can be arranged on the packaging structure.
Fig. 1 shows a case where the graphite layer 1041 is located on the side of the flexible substrate 101 away from the array layer 102, the flexible film layer 1042 is located on the side of the graphite layer 1041 away from the flexible substrate 101, and the neutral plane M1 of the graphite composite layer 104 is located on the flexible film layer 1042 in the graphite composite layer 104. Fig. 2 shows a schematic diagram of a bending state of the flexible display panel according to the present invention, in which the flexible display panel has a neutral plane M2 as a whole, so as to avoid peeling of each film layer in the display layer 103 during bending and reduce bending stress borne by the display layer 103 as much as possible, so that the neutral plane M2 is usually located on the display layer 103, and the array layer 102, the flexible substrate 101, and the graphite composite layer 104 are all under pressure stress in the bending state. As shown in fig. 3, when the flexible display panel is in the bent state, the graphite composite layer 104 is subjected to a compressive stress as a whole, and the neutral plane M1 of the graphite composite layer 104 is located on the flexible film layer 1042 in the present invention, then in the graphite composite layer 104, the graphite layer 1041 is subjected to a tensile stress F1, a portion of the flexible film layer 1042 between the neutral plane M1 and the graphite layer 1041 is also subjected to a tensile stress F1, and a portion of the flexible film layer 1042 located at the neutral plane M1 and away from the graphite layer 1041 is subjected to a compressive stress F2. The compressive stress borne by the entire graphite composite layer 104 is greater than the tensile stress, so that the entire graphite composite layer 104 bears the compressive stress.
Based on the same principle, in the case that the graphite layer 1041 is located on the side of the flexible film layer 1042 close to the flexible substrate 101, and the neutral plane M1 of the graphite composite layer 104 is located between the graphite layer 1041 and the flexible film layer 1042. When the flexible display panel is bent, in the graphite composite layer 104, the graphite layer 1041 is under a tensile stress, and the flexible film layer 1042 is under a compressive stress. The compressive stress borne by the entire graphite composite layer 104 is greater than the tensile stress, and the entire graphite composite layer 104 bears the compressive stress.
In an alternative embodiment, fig. 4 shows the case where the flexible film layer 1042 is located on the side of the flexible substrate 101 away from the array layer 102, the graphite layer 1041 is located on the side of the flexible film layer 1042 away from the flexible substrate 101, and the neutral plane M1 of the graphite composite layer 104 is located on the flexible film layer 1042. Fig. 5 shows a schematic view of a bending state of the flexible display panel, where the flexible display panel has a neutral plane M2 as a whole, and the neutral plane M2 is usually located on the display layer 103 to minimize bending stress applied to the display layer 103 in order to avoid peeling of each film layer in the display layer 103 during bending, and thus the array layer 102, the flexible substrate 101, and the graphite composite layer 104 are all subjected to tensile stress in the bending state shown in fig. 5. As shown in fig. 6, when the flexible display panel is in the bent state, the graphite composite layer 104 is subjected to a tensile stress as a whole, the neutral plane M1 of the graphite composite layer 104 is located on the flexible film layer 1042, then in the graphite composite layer 104, the graphite layer 1041 is subjected to a tensile stress F1, a portion of the flexible film layer 1042 between the neutral plane M1 and the graphite layer 1041 is also subjected to a tensile stress F1, and a portion of the flexible film layer 1042 located at the neutral plane M1 and away from the graphite layer 1041 is subjected to a compressive stress F2. The tensile stress borne by the entire graphite composite layer 104 is greater than the compressive stress, and the entire graphite composite layer 104 bears the tensile stress.
Based on the same principle, in the case that the graphite layer 1041 is located on the side of the flexible film layer 1042 away from the flexible substrate 101, and the neutral plane M1 of the graphite composite layer 104 is located between the graphite layer 1041 and the flexible film layer 1042. When the flexible display panel is bent, in the graphite composite layer 104, the graphite layer 1041 is under a tensile stress, and the flexible film layer 1042 is under a compressive stress. The tensile stress borne by the entire graphite composite layer 104 is greater than the compressive stress, and the entire graphite composite layer 104 bears the tensile stress.
According to the flexible display panel, the graphite composite layer is arranged in the bending area, and the neutral surface of the graphite composite layer is positioned on the flexible film layer or between the graphite layer and the flexible film layer. The graphite layer is made of graphite materials, the graphite layer is of an interlayer structure, the binding force between carbon atoms on the same plane layer is strong and is extremely difficult to damage, and the layers are combined by intermolecular force, so that the binding force is weak. When the graphite layer bears the pressure stress, the layer stripping phenomenon can be generated between layers, and the structure between layers is basically not changed when the graphite layer bears the tensile stress. The invention can avoid the graphite layer bearing the pressure stress, thereby avoiding the interlayer stripping phenomenon of the graphite layer and ensuring the performance reliability of the flexible display panel. In addition, the graphite layer in the graphite composite layer has good heat-conducting property, when the flexible display panel displays, the light-emitting device in the display layer can generate heat, and the graphite layer can conduct heat quickly, so that the heat can be dissipated timely.
Fig. 7 is a schematic diagram of another alternative implementation of the flexible display panel according to the embodiment of the present invention. As shown in fig. 7, a graphite composite layer 104 is provided over the entire surface of the flexible substrate 101 on the side away from the array layer 102. Fig. 7 shows that in the graphite composite layer 104, the graphite layer 1041 may be located on the side of the flexible film layer 1042 adjacent to the flexible substrate 101. The neutral plane M1 of the graphite composite layer 104 is located between the graphite layer 1041 and the flexible film layer 1042 or located at the flexible film layer 1042. Optionally, in the graphite composite layer 104, the flexible film layer 1042 may also be located on the side of the graphite layer 1041 close to the flexible substrate 101. The flexible film layer 1042 is arranged to ensure the tensile stress of the graphite layer 1041 when the display panel is bent, so as to avoid the interlayer peeling phenomenon of the graphite layer 1042 and ensure the performance reliability of the flexible display panel. In addition, the whole face of flexible display panel is provided with the graphite composite bed, and the graphite layer heat conductivility in the graphite composite bed is good, and when flexible display panel shows, luminescent device in the display layer can produce the heat, and the heat conduction heat that the graphite layer can be quick is favorable to thermal giving off, and the whole face of graphite layer is provided with the homogeneity that does benefit to the whole face temperature of assurance flexible display panel.
Optionally, the material for manufacturing the flexible film layer 1042 in the present invention includes a flexible polymer material. The flexible film layer has certain elastic modulus and thickness, guarantees that elastic deformation is less after the flexible film layer bears the exogenic action, can transmit the effort that its self received to after can guaranteeing that flexible film layer and graphite layer make up into the graphite composite bed, the neutral plane of graphite composite bed can be located between graphite layer and the flexible film layer, perhaps is located the flexible film layer. Therefore, the graphite layer bears the tensile stress in the bending process of the flexible display panel. Optionally, the flexible polymer material comprises any one or more of polyimide, polycarbonate, polyethersulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate, or glass fiber reinforced plastic. In actual manufacturing, the manufacturing material of the flexible film layer can be selected according to the requirements of process conditions, cost control and the like.
According to the flexible display panel provided by the invention, the flexible film layer can be used as an encapsulating material of the graphite layer during manufacturing, and the flexible film layer is wrapped by the graphite layer to form a graphite composite layer; or a bonding layer can be arranged between the graphite layer and the flexible film layer, so that the graphite layer and the flexible film layer are bonded together to form a graphite composite layer.
In an embodiment, fig. 8 is a schematic diagram of another alternative implementation of the flexible display panel according to the embodiment of the present invention. As shown in fig. 8, the graphite composite layer 104 includes a first glue layer J1, the first glue layer J1 is located between the graphite layer 1041 and the flexible film layer 1042. Fig. 8 is only an example of the case where the graphite layer 1041 in the graphite composite layer 104 is located on the side of the flexible film layer 1042 close to the flexible substrate 101.
In this embodiment, it is required to ensure that the thickness of the first adhesive layer J1 is very thin, and the first adhesive layer J1 needs to have a larger elastic modulus, so that the arrangement can ensure that the first adhesive layer J1 can transfer the stress borne by itself after being stressed, thereby ensuring that the neutral surface of the graphite composite layer 104 is located between the graphite layer 1041 and the flexible film layer 1042 or located on the flexible film layer 1042.
With continued reference to fig. 8, the ratio of the thickness D1 of the graphite layer 1041 to the thickness D2 of the flexible film layer 1042 is D1, and the ratio of the thickness D3 of the first glue layer J1 to the thickness D1 of the graphite layer 1041 is D2; wherein D1 is more than or equal to 0.1 and less than or equal to 0.5, and D2 is more than or equal to 0.1 and less than or equal to 0.5. Guarantee in this embodiment that the thickness on graphite layer is less than the thickness of flexible rete, the thickness on first glue film is less than the thickness on graphite layer, and the thickness of setting for the graphite layer satisfies the certain ratio scope with the thickness on flexible rete, and the thickness on first glue film also satisfies the certain ratio scope with the thickness on graphite layer, makes the neutral plane of graphite composite bed be located between graphite layer and the flexible rete through the cooperation on the rete thickness, perhaps is located flexible rete.
Optionally, the elastic modulus of the first glue layer J1 is E, wherein E is more than or equal to 50MPa and less than or equal to 1000 MPa. The elastic modulus of the first adhesive layer is guaranteed to be large, and when the flexible display panel is bent, the first adhesive layer is guaranteed to be capable of transmitting bending stress received by the first adhesive layer.
In one embodiment, in the flexible display panel provided by the invention, the thickness of the graphite layer is 17 μm, the thickness of the first adhesive layer is 5 μm, and the thickness of the flexible film layer is 50 μm, wherein the elastic modulus of the first adhesive layer is 300MPa, and the elastic modulus of the flexible film layer is 1-5 GPa.
Fig. 9 is a schematic diagram of another alternative implementation of the flexible display panel according to the embodiment of the present invention. As shown in fig. 9, the flexible display panel further includes a second glue layer J2; the second glue layer J2 is located on the side of the graphite composite layer 104 close to the flexible substrate 101. Fig. 9 is only an example of the case where the graphite layer 1041 in the graphite composite layer 104 is located on the side of the flexible film layer 1042 close to the flexible substrate 101. Optionally, a first glue layer J1 as shown in the figure may be further disposed between the graphite layer 1041 and the flexible film layer 1042. In this embodiment, the second adhesive layer serves as a bonding layer for adhering the graphite composite layer to the flexible substrate. The elastic modulus of the second adhesive layer can be smaller, the elastic deformation of the second adhesive layer is larger when the second adhesive layer bears external force, and the second adhesive layer can hardly transmit the force borne by the second adhesive layer to the outside when the flexible display panel is bent.
Optionally, the second adhesive layer is a grid adhesive PET double-sided tape. The graphite composite layer has a grid rubber surface, has good exhaust performance, can be pasted in a large area, does not generate bubbles, and is favorable for the smoothness of the pasted graphite composite layer and the flexible substrate.
Fig. 10 is a schematic diagram of another alternative implementation of the flexible display panel according to the embodiment of the present invention. As shown in fig. 10, the flexible display panel further includes a buffer layer 105, where the buffer layer 105 is located on a side of the graphite composite layer 104 away from the array layer 102; a third glue layer J3 is also provided between buffer layer 105 and graphite composite layer 104. In this embodiment, the buffer layer can absorb the bending stress when the flexible display panel is bent, and the bending resistance of the flexible display panel is improved. Wherein, the buffer layer is bonded with the graphite composite layer through a third glue layer. The elastic modulus of the third adhesive layer can be smaller, the elastic deformation of the third adhesive layer is larger when the third adhesive layer bears external force, and the third adhesive layer can hardly transfer the force borne by the third adhesive layer to the outside when the flexible display panel is bent.
In fig. 10, only the case where the graphite layer 1041 in the graphite composite layer 104 is located on the side of the flexible film layer 1042 adjacent to the flexible substrate 101 is illustrated. Optionally, in this embodiment, as shown, a first glue layer J1 may be disposed between the graphite layer 1041 and the flexible film layer 1042, and a second glue layer J2 may be disposed between the graphite composite layer 104 and the flexible substrate 101. The thickness of the first glue layer J1 is very thin, and the elastic modulus of the first glue layer J1 is far larger than the elastic modulus of the second glue layer J2 and the elastic modulus of the third glue layer J3. When the flexible display panel is bent, the first adhesive layer J1 can transmit bending stress to enable the graphite layer in the graphite composite layer to bear the tensile stress. And after the second adhesive layer J2 and the third adhesive layer J3 are stressed, certain deformation can occur, namely, stress can be absorbed, and the stress is relieved.
Optionally, the third adhesive layer J3 is an adhesive layer. The adhesive layer may be a double-sided adhesive tape, and when the flexible display panel is manufactured, the adhesive layer is firstly attached to the surface of the buffer layer, and then the buffer layer is attached to the graphite composite layer. The adhesive layer can also be a coated adhesive layer, and when the flexible display panel is manufactured, the adhesive layer is coated on the surface of the buffer layer firstly, and then the buffer layer is attached to the graphite composite layer. The adhesive layer may also be other kinds of adhesive layers, which are not limited in this application. Optionally, the buffer layer that plays a role in relieving bending stress when the flexible display panel is bent may include a foam layer.
Fig. 11 is a schematic view of a display device according to an embodiment of the present invention. As shown in fig. 11, the display device includes a flexible display panel 100 provided in any embodiment of the present invention. The display device provided by the invention includes but is not limited to the following categories: the mobile terminal comprises a television, a notebook computer, a desktop display, a tablet computer, a digital camera, a mobile phone, an intelligent bracelet, intelligent glasses, a vehicle-mounted display, medical equipment, industrial control equipment, a touch interaction terminal and the like.
According to the embodiment, the flexible display panel and the display device provided by the invention at least realize the following beneficial effects:
according to the flexible display panel, the graphite composite layer is arranged in the bending area, and the neutral surface of the graphite composite layer is positioned on the flexible film layer or between the graphite layer and the flexible film layer. The graphite layer is made of graphite materials, the graphite layer is of an interlayer structure, the binding force between carbon atoms on the same plane layer is strong and is extremely difficult to damage, and the layers are combined by intermolecular force, so that the binding force is weak. When the graphite layer bears the pressure stress, the layer stripping phenomenon can be generated between layers, and the structure between layers is basically not changed when the graphite layer bears the tensile stress. The invention can avoid the graphite layer bearing the pressure stress, thereby avoiding the interlayer stripping phenomenon of the graphite layer and ensuring the performance reliability of the flexible display panel. In addition, the graphite layer in the graphite composite layer has good heat-conducting property, when the flexible display panel displays, the light-emitting device in the display layer can generate heat, and the graphite layer can conduct heat quickly, so that the heat can be dissipated timely.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (13)
1. A flexible display panel, comprising:
a flexible substrate;
the array layer is positioned on the flexible substrate;
the display layer is positioned on one side, away from the flexible substrate, of the array layer and comprises a plurality of light-emitting devices;
the flexible display panel comprises a bendable region, at least the bendable region is provided with a graphite composite layer, and the graphite composite layer comprises a graphite layer and a flexible film layer which are mutually overlapped; wherein the content of the first and second substances,
the graphite composite layer is provided with a neutral plane, and the neutral plane is positioned between the graphite layer and the flexible film layer or positioned on the flexible film layer;
the graphite composite layer comprises a first adhesive layer, and the first adhesive layer is positioned between the graphite layer and the flexible film layer;
the ratio of the thickness of the graphite layer to the thickness of the flexible film layer is D1, and the ratio of the thickness of the first glue layer to the thickness of the graphite layer is D2; wherein D1 is more than or equal to 0.1 and less than or equal to 0.5, and D2 is more than or equal to 0.1 and less than or equal to 0.5.
2. The flexible display panel of claim 1,
in the graphite composite layer, the graphite layer is positioned on one side of the flexible substrate, which is far away from the array layer, and the flexible film layer is positioned on one side of the graphite layer, which is far away from the flexible substrate.
3. The flexible display panel of claim 1,
in the graphite composite layer, the flexible film layer is located on one side of the flexible substrate far away from the array layer, and the graphite layer is located on one side of the flexible film layer far away from the flexible substrate.
4. The flexible display panel of claim 1,
and the graphite composite layer is arranged on the whole surface of one side of the flexible substrate, which is far away from the array layer.
5. The flexible display panel of claim 1,
the flexible film layer is made of a flexible polymer material.
6. The flexible display panel of claim 5,
the flexible polymer material comprises any one of polyimide, polycarbonate, polyether sulfone, polyethylene terephthalate, polyethylene naphthalate, polyarylate or glass fiber reinforced plastic.
7. The flexible display panel of claim 1,
the elastic modulus of the first adhesive layer is E, wherein E is more than or equal to 50MPa and less than or equal to 1000 MPa.
8. The flexible display panel of claim 1,
the flexible display panel further comprises a second adhesive layer;
the second adhesive layer is positioned on one side of the graphite composite layer close to the flexible substrate.
9. The flexible display panel of claim 8,
the second adhesive layer is a grid adhesive PET double-sided adhesive tape.
10. The flexible display panel of claim 1,
the flexible display panel further comprises a buffer layer, and the buffer layer is positioned on one side, away from the array layer, of the graphite composite layer;
and a third adhesive layer is also arranged between the buffer layer and the graphite composite layer.
11. The flexible display panel of claim 10,
the third glue layer is an adhesive layer.
12. The flexible display panel of claim 10, wherein the buffer layer comprises a foam layer.
13. A display device characterized by comprising the flexible display panel according to any one of claims 1 to 12.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110444116B (en) * | 2019-07-16 | 2021-07-06 | 武汉华星光电半导体显示技术有限公司 | Flexible substrate and preparation method thereof |
| CN111509137A (en) * | 2020-04-24 | 2020-08-07 | 合肥维信诺科技有限公司 | Flexible display screen |
| CN113707007A (en) * | 2020-05-21 | 2021-11-26 | 华为技术有限公司 | Display panel and display device |
| CN114067675B (en) * | 2020-08-07 | 2024-05-24 | 北京小米移动软件有限公司 | Folding screen, maintenance method thereof and electronic equipment |
| CN113687461A (en) * | 2021-08-23 | 2021-11-23 | 京东方科技集团股份有限公司 | Polarizing plate, folding module and display device |
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