CN110061039B - Flexible display panel and display device - Google Patents
Flexible display panel and display device Download PDFInfo
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- CN110061039B CN110061039B CN201910346214.7A CN201910346214A CN110061039B CN 110061039 B CN110061039 B CN 110061039B CN 201910346214 A CN201910346214 A CN 201910346214A CN 110061039 B CN110061039 B CN 110061039B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
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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
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
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Abstract
The application relates to the technical field of display, in particular to a flexible display panel and a display device. The flexible display panel may include a display device, a first functional layer, and a second functional layer; a first functional layer formed on one side of the display device; a second functional layer is formed on one side of the display device far away from the first functional layer, and the modulus of the second functional layer is larger than that of the first functional layer; wherein the first functional layer includes a first main body portion and a first regulating portion arranged in a curling direction of the flexible display panel, and a modulus of the first regulating portion is greater than a modulus of the first main body portion; and/or the second functional layer includes a second main body portion and a second regulating portion arranged in a curling direction of the flexible display panel, and a modulus of the second regulating portion is smaller than a modulus of the second main body portion. The scheme has good reliability while ensuring that the flexible display panel can be curled.
Description
Technical Field
The application relates to the technical field of display, in particular to a flexible display panel and a display device.
Background
With the development of display technology, flexible display panels are applied more and more widely. Among them, flexible display panels are expected to be stretched, rolled, folded, and the like, and at present, when the flexible display panel is rolled, the flexible display panel is deformed at every position, which easily causes a decrease in reliability of the product.
It is to be noted that the information disclosed in the above background section is only for enhancement of understanding of the background of the present application and therefore may include information that does not constitute prior art known to a person of ordinary skill in the art.
Disclosure of Invention
The present application aims to provide a flexible display panel and a display device which can be curled and have good reliability.
A first aspect of the present application provides a flexible display panel, comprising:
a display device;
a first functional layer formed at one side of the display device;
a second functional layer formed on a side of the display device remote from the first functional layer, the second functional layer having a modulus greater than the modulus of the first functional layer;
wherein the first functional layer includes a first main body portion and a first regulating portion arranged in a curling direction of the flexible display panel, and a modulus of the first regulating portion is greater than a modulus of the first main body portion; and/or
The second functional layer includes a second main body portion and a second regulating portion arranged in a curling direction of the flexible display panel, and a modulus of the second regulating portion is smaller than a modulus of the second main body portion.
In one exemplary embodiment of the present application,
a plurality of first adjusting parts are arranged, and the first main body part is arranged between the adjacent first adjusting parts;
wherein, in the curling direction of the flexible display panel, the intervals between the adjacent first adjusting parts are sequentially reduced.
In one exemplary embodiment of the present application,
the first adjusting part extends in a bent shape in a direction perpendicular to the thickness direction and the curling direction of the flexible display panel.
In one exemplary embodiment of the present application,
the first functional layer is a back film adhesive layer;
the flexible display panel further comprises a back film base material formed on one side of the back film adhesive layer, which is far away from the display device.
In one exemplary embodiment of the present application,
the second functional layer is an organic packaging layer:
the flexible display panel further comprises an inorganic encapsulation layer formed between the display device and the organic encapsulation layer.
In one exemplary embodiment of the present application,
a plurality of second adjusting parts are arranged, and the second main body part is arranged between every two adjacent second adjusting parts;
wherein, in the curling direction of the flexible display panel, the intervals between the adjacent second adjusting parts are sequentially reduced.
In one exemplary embodiment of the present application,
the second adjusting part extends in a bent shape in a direction perpendicular to the thickness direction and the curling direction of the flexible display panel.
In one exemplary embodiment of the present application,
in a projection obtained in the thickness direction of the flexible display panel, the projection of the second adjustment portion coincides with the projection of the first adjustment portion.
In one exemplary embodiment of the present application,
the first functional layer is made of at least one of rubber pressure-sensitive adhesive and resin pressure-sensitive adhesive;
the second functional layer is made of at least one of epoxy resin organic materials, acrylate organic materials and organic silicon materials.
A second aspect of the present application provides a display device, comprising: the flexible display panel of any of the above.
The technical scheme provided by the application can achieve the following beneficial effects:
the application provides a flexible display panel and display device, through improving the partial modulus of first functional layer and/or second functional layer, can guarantee the performance of first functional layer and second functional layer, still can make the deformation volume of first functional layer and the deformation volume of second functional layer more be close at the curling in-process of flexible display panel, can alleviate the condition that each layer structure fracture or each layer structure of flexible display panel peeled off between then, improved flexible display panel's reliability.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
Fig. 1 is a schematic structural diagram of a flexible display panel according to an embodiment of the present application;
fig. 2 is a schematic plan view illustrating a first functional layer in a flexible display panel according to an embodiment of the present application;
fig. 3 is a schematic plan view illustrating a second functional layer in a flexible display panel according to an embodiment of the present application.
Reference numerals:
10. a display device; 11. a packaging structure; 110. an inorganic encapsulation layer; 111. a second functional layer; 111a, a second regulating part; 111b, a second body portion; 12. a first functional layer; 120. a first adjusting section; 121. a first body portion.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their detailed description will be omitted.
Although relative terms, such as "upper" and "lower," may be used in this specification to describe one element of an icon relative to another, these terms are used in this specification for convenience only, e.g., in accordance with the orientation of the examples described in the figures. It will be appreciated that if the device of the icon were turned upside down, the element described as "upper" would become the element "lower". When a structure is "on" another structure, it may mean that the structure is integrally formed with the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure via another structure.
The terms "a," "an," "the," "said" are used to indicate the presence of one or more elements/components/etc.; the terms "comprising" and "having" are intended to be inclusive and mean that there may be additional elements/components/etc. other than the listed elements/components/etc.; the terms "first," "second," and the like are used merely as labels, and are not limiting on the number of their objects.
OLED (Organic Light-Emitting Diode) display panels are considered as the most promising flat panel display panels in the current generation, and are also considered as the most promising display technology for flexible display panels.
Among them, the flexible display panel has been widely used in commercial products due to its characteristics of lightness, thinness, and deformability. The screen, the bang screen, the water drop screen and the like with two bent sides in the market are all realized by adopting a flexible display panel to carry out certain treatment.
At present, the flexible display panel is expected to be in a form of being stretched, rolled, folded, etc., but when the flexible display panel is rolled, the flexible display panel is deformed at every position, which easily causes the reliability of the product to be lowered.
The embodiments of the present application provide a flexible display panel, which may be an OLED flexible display panel, but is not limited thereto, and may also be other types of flexible display panels. As shown in fig. 1, the flexible display panel may include a display device 10, a first functional layer 12 and a second functional layer 111, specifically:
the display device 10 may be an OLED display device 10, but is not limited thereto, and may be other display devices 10. For example, when the display device 10 is an OLED display device 10, the display device 10 may include a flexible substrate, an organic semiconductor switch, and an OLED light emitting element. The material of the flexible substrate may be PI (polyimide), PEN (polyethylene naphthalate), PET (polyethylene terephthalate), and the like, but is not limited thereto; an organic semiconductor switch is formed on the flexible substrate, and the organic semiconductor switch may include, but is not limited to, an LTPS (Low Temperature polysilicon) structure, an Oxide (Oxide) structure, and the like; the OLED light-emitting component can comprise an electrode layer, an organic light-emitting layer and a functional layer (the functional layer can be a hole transport layer and an electron transport layer), the electrode layer, the organic light-emitting layer and the functional layer can be evaporated by vacuum evaporation equipment, wherein one electrode layer in the OLED light-emitting component can be connected with an organic semiconductor switch.
It should be noted that, since the OLED light emitting device is a relatively mature technology, the structure of the OLED light emitting device is not specifically described in this embodiment.
The first functional layer is formed on one side of the display device 10.
For example, the first functional layer 12 may belong to a layer in a back film structure of a flexible display panel, and when the display device 10 is the aforementioned OLED display device 10, the first functional layer 12 may be formed on a side of the aforementioned flexible substrate facing away from the organic semiconductor switch. In detail, the first functional layer 12 may be a back film adhesive layer, and the first functional layer 12 may be made of at least one of a rubber pressure-sensitive adhesive and a resin pressure-sensitive adhesive, wherein the rubber pressure-sensitive adhesive may be natural rubber or synthetic rubber; the resin rubber can be made of acrylic ester and organic silicon.
The back film structure may further include a back film substrate, the back film substrate is formed on a side of the back film adhesive layer away from the display device, and the back film substrate is bonded to the display device through the back film adhesive layer to support and protect the display device 10. The backing film base material is mostly made of materials such as PET, PEN, PI and the like.
The second functional layer 111 is formed on the side of the display device 10 remote from the first functional layer 12.
For example, the second functional layer 111 may belong to a layer in the encapsulation structure 11 of the flexible display panel, and when the display device 10 is the aforementioned OLED display device 10, the second functional layer 111 may be formed on a side of the OLED light emitting element facing away from the flexible substrate to encapsulate and protect the OLED light emitting element. In detail, the second functional layer 111 may be an organic encapsulation layer, and the organic encapsulation layer is mostly made of a curable organic material (such curing includes photo-curing or thermal-curing), and specifically, the second functional layer 111 may be made of at least one of an epoxy resin organic material, an acrylate organic material, and a silicone organic material.
The package structure 11 may further include an inorganic package layer 110. The inorganic encapsulation layer 110 may be formed between the display device 10 and the second functional layer 111, and the inorganic encapsulation layer 110 is used for blocking water and oxygen; an organic encapsulation layer may be formed on the side of the inorganic encapsulation layer 110 facing away from the display device 10 for planarization.
For example, the inorganic encapsulation Layer 110 can be prepared by using PECVD (Plasma Enhanced Chemical Vapor Deposition) or ALD (Atomic Layer Deposition), and specifically, a metal mask plate can be used to deposit an inorganic encapsulation material on an area to be encapsulated according to design requirements by using PECVD or ALD. The organic encapsulation layer can be prepared by using an IJP (Ink Jet Printing) process or screen Printing.
It should be noted that the encapsulation structure 11 not only includes the aforementioned inorganic encapsulation layer 110 and organic encapsulation layer, but also includes other inorganic encapsulation layers and organic encapsulation layers, and the inorganic encapsulation layer 110 and the organic encapsulation layer can be alternately stacked.
In the present embodiment, since the modulus of the entire first functional layer 12 is smaller than that of the entire second functional layer 111, the first functional layer 12 can be selected as a curled inner layer and the second functional layer 111 can be selected as a curled outer layer when the flexible display panel is curled.
It should be understood that, when the flexible display panel is continuously wound to form a roll-shaped structure, and when both the curled head end and the curled tail end of the flexible display panel are in a fixed state, because the deformation amounts of the first functional layer 12 and the second functional layer 111 are different, the flexible display panel is prone to have a situation that each layer structure is broken or each layer structure is peeled off, and the reliability of the flexible display panel is reduced.
Taking the example that the modulus of the whole first functional layer 12 is smaller than that of the whole second functional layer 111, the present application provides three possible embodiments to solve the foregoing problem, specifically including:
first practical embodiment: improving the first functional layer 12; in detail, when designing the first functional layer 12, a part of the first functional layer 12 may be made to be a tuning part having a large modulus, that is: as shown in fig. 2, the first functional layer 12 may include a first main body portion 121 and a first adjustment portion 120 arranged in a curling direction (e.g., an X direction in fig. 1 to 3) of the flexible display panel, and a modulus of the first adjustment portion 120 is greater than a modulus of the first main body portion 121, in this embodiment, by providing the first adjustment portion 120 with a greater modulus, while ensuring performance of the whole first functional layer 12, slippage of the first main body portion 121 may be appropriately reduced, so that a deformation amount of the whole first functional layer 12 may be reduced, so that the deformation amount of the first functional layer 12 is closer to that of the second functional layer 111, and thus, a situation that each layer structure of the flexible display panel is broken or each layer structure is peeled off from each other may be alleviated, and reliability of the flexible display panel may be improved.
Wherein, this embodiment compares in the scheme that is the great first functional layer 12 of modulus with first functional layer 12 global design, thereby can avoid the too big condition that leads to first functional layer 12 stress great of modulus of first functional layer 12, has guaranteed the performance and the stability in use of first functional layer 12 then.
In the first embodiment, optionally, the first adjustment portion 120 is provided in a plurality, wherein the first main body portion 121 is provided between adjacent first adjustment portions 120, in other words, the first adjustment portion 120 and the first main body portion 121 may be arranged in a staggered manner in the curling direction of the flexible display panel to ensure the modulus balance of the whole first functional layer 12, that is: the modulus of the first functional layer 12 is prevented from being bipolar-differentiated, thereby ensuring the stability of the first functional layer 12 in use.
Since the stress will gradually accumulate with the continuous winding of the flexible display panel, when the flexible display panel is continuously wound to form the roll-like structure, more stress is accumulated in a portion away from the central axis of the roll-like structure, that is: more stress is accumulated at the winding tail end, so that each layer structure in the flexible display panel is easy to break at the winding tail end or each layer structure is easy to peel off at the winding tail end, and the reliability of the flexible display panel is reduced. In order to reduce the stress accumulated at the curled end, in the first embodiment, optionally, the intervals between the adjacent first regulating parts 120 are sequentially decreased in the curling direction of the flexible display panel, that is, the closer to the curled end, the closer the first regulating parts 120 are disposed.
For example, the sizes of the first adjustment parts 120 may be equal, but are not limited thereto.
In the first embodiment, optionally, the first adjustment part 120 may extend in a bent shape in a direction (e.g., Y direction shown in fig. 2) perpendicular to a thickness direction (e.g., Z direction shown in fig. 1) and a curling direction of the flexible display panel, so that stress of the curled flexible display panel in an axial direction (the axial direction refers to a direction perpendicular to the thickness direction and the curling direction of the flexible display panel) may be reduced, thereby improving reliability of the flexible display panel.
The first adjustment portion 120 is not limited to a bent extension, and may extend linearly.
Second possible embodiment: the second functional layer 111 is improved; when designing the second functional layer 111, a part of the second functional layer 111 may be made to function as a tuning part having a small modulus, that is: as shown in fig. 3, the second functional layer 111 may include a second main body portion 111b and a second adjustment portion 111a arranged in the curling direction of the flexible display panel, and the modulus of the second adjustment portion 111a is smaller than the modulus of the second main body portion 111b, in this embodiment, by providing the second adjustment portion 111a with a smaller modulus, while the performance of the whole second functional layer 111 is ensured, the deformation amount of the whole second functional layer 111 may be appropriately increased, so that the deformation amount of the second functional layer 111 is closer to the deformation amount of the first functional layer 12, thereby alleviating the occurrence of fracture of each layer structure or separation between each layer structure of the flexible display panel, and improving the reliability of the flexible display panel.
However, compared to the second functional layer 111 having a lower modulus as a whole, the second embodiment can alleviate excessive slippage of the second adjustment portion 111a by the second body portion 111b, that is: the excessive slip of the entire second functional layer 111 is alleviated.
In the second possible embodiment, optionally, the second adjustment part 111a is provided in plurality, and the second main body part 111b is provided between adjacent second adjustment parts 111a, in other words, the second adjustment parts 111a and the second main body part 111b may be arranged in a staggered manner in the curling direction of the flexible display panel to ensure the modulus balance of the whole second functional layer 111, that is: the modulus of the second functional layer 111 is prevented from being bipolar-differentiated, thereby ensuring the stability of the second functional layer 111 in use.
Since the stress will gradually accumulate with the continuous winding of the flexible display panel, when the flexible display panel is continuously wound to form the roll-like structure, more stress is accumulated in a portion away from the central axis of the roll-like structure, that is: more stress is accumulated at the winding tail end, so that each layer structure in the flexible display panel is easy to break at the winding tail end or each layer structure is easy to peel off at the winding tail end, and the reliability of the flexible display panel is reduced. In order to reduce the stress accumulated at the curled end, in the second possible embodiment, optionally, the intervals between the adjacent second regulating parts 111a are sequentially decreased in the curling direction of the flexible display panel, that is, the closer to the curled end, the closer the first regulating parts 120 are disposed.
For example, the sizes of the second adjustment portions 111a may be equal, but are not limited thereto.
In the second possible embodiment, optionally, the second adjusting part 111a extends in a bent shape in a direction (the Y direction shown in fig. 3) perpendicular to the thickness direction and the curling direction of the flexible display panel, so that the stress of the curled flexible display panel in the axial direction (the axial direction refers to the direction perpendicular to the thickness direction and the curling direction of the flexible display panel) can be reduced, thereby improving the reliability of the flexible display panel.
The second adjustment portion 111a is not limited to a bent shape and may extend linearly.
Third possible embodiment: simultaneously improving the first functional layer 12 and the second functional layer 111; the modified form of the first functional layer 12 may be as described in any of the first embodiments, and is not described herein again; the modified form of the second functional layer 111 may be as described in any of the second possible embodiments, and will not be described herein again.
In the case of the third possible embodiment, optionally, as shown in fig. 1, in the projection obtained in the thickness direction of the flexible display panel, the projection of the second regulating part 111a and the projection of the first regulating part 120 may be overlapped, so that the stress accumulation in the radial direction of the flexible display panel after the curling may be eliminated.
The modulus in the various embodiments of the present application refers to the elastic modulus (young's modulus).
The present application also provides a display device including the flexible display panel described in any of the above embodiments. The display device can be one of an electronic reader, a mobile phone, a computer display screen, a billboard and a television.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
Claims (9)
1. A flexible display panel, comprising:
a display device;
a first functional layer formed at one side of the display device;
a second functional layer formed on a side of the display device away from the first functional layer, the second functional layer having a modulus of elasticity greater than the modulus of elasticity of the first functional layer;
the first functional layer comprises a first main body part and a first adjusting part which are arranged in the curling direction of the flexible display panel, and the elastic modulus of the first adjusting part is larger than that of the first main body part;
the second functional layer comprises a second main body part and a second adjusting part which are arranged in the curling direction of the flexible display panel, the elastic modulus of the second adjusting part is smaller than that of the second main body part, and in the projection obtained in the thickness direction of the flexible display panel, the projection of the second adjusting part is superposed with that of the first adjusting part.
2. The flexible display panel of claim 1,
a plurality of first adjusting parts are arranged, and the first main body part is arranged between the adjacent first adjusting parts;
wherein, in the curling direction of the flexible display panel, the intervals between the adjacent first adjusting parts are sequentially reduced.
3. The flexible display panel of claim 1,
the first adjusting part extends in a bent shape in a direction perpendicular to the thickness direction and the curling direction of the flexible display panel.
4. The flexible display panel of claim 1,
the first functional layer is a back film adhesive layer;
the flexible display panel further comprises a back film base material formed on one side of the back film adhesive layer, which is far away from the display device.
5. The flexible display panel of claim 1, wherein the second functional layer is an organic encapsulation layer:
the flexible display panel further comprises an inorganic encapsulation layer formed between the display device and the organic encapsulation layer.
6. The flexible display panel of claim 1,
a plurality of second adjusting parts are arranged, and the second main body part is arranged between every two adjacent second adjusting parts;
wherein, in the curling direction of the flexible display panel, the intervals between the adjacent second adjusting parts are sequentially reduced.
7. The flexible display panel of claim 1,
the second adjusting part extends in a bent shape in a direction perpendicular to the thickness direction and the curling direction of the flexible display panel.
8. The flexible display panel of claim 1,
the first functional layer is made of at least one of rubber pressure-sensitive adhesive and resin pressure-sensitive adhesive;
the second functional layer is made of at least one of epoxy resin organic materials, acrylate organic materials and organic silicon materials.
9. A display device, comprising: the flexible display panel of any one of claims 1 to 8.
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| CN201910346214.7A CN110061039B (en) | 2019-04-26 | 2019-04-26 | Flexible display panel and display device |
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| CN201910346214.7A CN110061039B (en) | 2019-04-26 | 2019-04-26 | Flexible display panel and display device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114449068A (en) | 2020-10-31 | 2022-05-06 | 华为技术有限公司 | Hinge mechanism and foldable electronic equipment |
| CN114338864A (en) | 2020-09-30 | 2022-04-12 | 华为技术有限公司 | Folding device and electronic equipment |
| CN113883156A (en) | 2020-07-01 | 2022-01-04 | 华为技术有限公司 | Folding module and folding electronic equipment |
| CN113140155B (en) * | 2020-01-20 | 2022-10-11 | 华为技术有限公司 | Electronic device |
| CN111383540B (en) * | 2020-04-30 | 2022-04-08 | 上海天马微电子有限公司 | Display device capable of being curled |
| CN112436041A (en) * | 2020-11-25 | 2021-03-02 | 京东方科技集团股份有限公司 | Flexible supporting layer and flexible display device |
| CN112967609B (en) * | 2021-03-15 | 2023-10-13 | 上海天马微电子有限公司 | Rollable display device |
| CN114446182B (en) * | 2022-02-25 | 2023-11-14 | 合肥维信诺科技有限公司 | Flexible cover plate and display module |
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