CN114220342B - Flexible display module and display device - Google Patents
Flexible display module and display device Download PDFInfo
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- CN114220342B CN114220342B CN202111255444.6A CN202111255444A CN114220342B CN 114220342 B CN114220342 B CN 114220342B CN 202111255444 A CN202111255444 A CN 202111255444A CN 114220342 B CN114220342 B CN 114220342B
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Classifications
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- 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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
Abstract
The application relates to the technical field of display, and discloses a flexible display module and a display device; the flexible display module comprises a flexible display panel and a strain rate sensitive layer; the strain rate sensitive layer is arranged on one side of the flexible display panel, and the modulus of the strain rate sensitive layer increases along with the increase of the strain rate. When the flexible display module is folded, the strain rate is low, the modulus of the strain rate sensitive layer is low, the flexible display module has good flexibility, and the flexible display module is easy to fold; the strain rate sensitive layer presents a glass state at a high strain rate, and at the moment, the modulus of the strain rate sensitive layer is larger and is not easy to deform, so that when the strain rate sensitive layer is subjected to external impact load, the strain rate sensitive layer presents smaller strain and has better impact resistance, and the impact resistance of the whole flexible display module is improved; and the flexible display panel below the strain rate sensitive layer can be effectively protected.
Description
Technical Field
The disclosure relates to the technical field of display, in particular to a flexible display module and a display device comprising the same.
Background
Currently, flexible display devices are being developed day by day, and folding display devices have begun to enter mass production, and there are two important development directions for folding display devices: on one hand, the folding display device adopts a large amount of flexible materials, and the impact resistance of the folding display device is weaker than that of the traditional rigid screen, so that the impact resistance of the folding display device needs to be improved; however, the folding display device needs to ensure sufficient flexibility to ensure folding performance and sufficient rigidity to improve impact resistance, and thus folding performance and impact resistance are contradictory. On the other hand, the folding display device requires a smaller and smaller bending radius to improve portability, but after the bending radius is reduced, the film layer of the folding display device is easily peeled off or broken.
It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the present disclosure and thus may include information that does not constitute prior art known to those of ordinary skill in the art.
Disclosure of Invention
The present disclosure aims to overcome the defect of weak impact resistance in the prior art, and provide a flexible display module with strong impact resistance and a display device including the flexible display module.
According to one aspect of the present disclosure, there is provided a flexible display module including:
a flexible display panel;
and the strain rate sensitive layer is arranged on one side of the flexible display panel, and the modulus of the strain rate sensitive layer increases along with the increase of the strain rate.
In an exemplary embodiment of the present disclosure, the material of the strain rate sensitive layer includes one or more of polyvinyl butyral, ethylene vinyl acetate copolymer, polyurethane.
In an exemplary embodiment of the present disclosure, the flexible display module further includes:
the ultrathin glass layer is arranged on one side of the strain rate sensitive layer, which is far away from the flexible display panel;
and the buffer coating is coated on one side of the ultrathin glass layer far away from the flexible display panel.
In an exemplary embodiment of the present disclosure, the material of the buffer coating layer includes one or more of polyimide, polyethylene terephthalate, thermoplastic polyurethane, and polymethyl methacrylate.
In an exemplary embodiment of the present disclosure, the flexible display module further includes:
and the protective film layer is arranged on one side of the ultrathin glass layer, which is close to the flexible display panel.
In an exemplary embodiment of the disclosure, the strain rate sensitive layer is coated on one side of the protective film layer, which is close to the ultrathin glass layer, a first bonding layer is arranged between the strain rate sensitive layer and the ultrathin glass layer, and a second bonding layer is arranged between the protective film layer and the flexible display panel; or, the strain rate sensitive layer is coated on one side, far away from the ultrathin glass layer, of the protective film layer, a third bonding layer is arranged between the strain rate sensitive layer and the flexible display panel, and a fourth bonding layer is arranged between the protective film layer and the ultrathin glass layer.
In an exemplary embodiment of the disclosure, the strain rate sensitive layer includes a first strain rate sensitive layer and a second strain rate sensitive layer, the first strain rate sensitive layer is coated on a side of the protective film layer, which is close to the ultrathin glass layer, the second strain rate sensitive layer is coated on a side of the protective film layer, which is far away from the ultrathin glass layer, a first adhesive layer is disposed between the first strain rate sensitive layer and the ultrathin glass layer, and a second adhesive layer is disposed between the second strain rate sensitive layer and the flexible display panel.
In an exemplary embodiment of the present disclosure, the strain rate sensitive layer includes a first strain rate sensitive layer and a second strain rate sensitive layer, the first strain rate sensitive layer is coated on a side of the ultra-thin glass layer near the flexible display panel, the second strain rate sensitive layer is coated on a side of the flexible display panel near the ultra-thin glass layer, and an adhesive layer is disposed between the first strain rate sensitive layer and the second strain rate sensitive layer.
In an exemplary embodiment of the present disclosure, the flexible display module further includes:
the polaroid is arranged on one side of the flexible display panel, which is close to the strain rate sensitive layer;
a back film disposed on a side of the flexible display panel away from the strain rate sensitive layer;
and the back support film is arranged on one side of the back film, which is far away from the flexible display panel.
According to another aspect of the present disclosure, there is provided a display apparatus including: the flexible display module according to any one of the above.
The flexible display module is characterized in that a strain rate sensitive layer is arranged on one side of a flexible display panel, and the modulus of the strain rate sensitive layer is increased along with the increase of the strain rate; when the flexible display module is folded, the strain rate is low, the modulus of the strain rate sensitive layer is low, the flexible display module has good flexibility, and the flexible display module is easy to fold; the strain rate sensitive layer presents a glass state at a high strain rate, and at the moment, the modulus of the strain rate sensitive layer is larger and is not easy to deform, so that when the strain rate sensitive layer is subjected to external impact load, the strain rate sensitive layer presents smaller strain and has better impact resistance, and the impact resistance of the whole flexible display module is improved; and the flexible display panel below the strain rate sensitive layer can be effectively protected.
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 disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure. It will be apparent to those of ordinary skill in the art that the drawings in the following description are merely examples of the disclosure and that other drawings may be derived from them without undue effort.
Fig. 1 is a schematic structural diagram of an exemplary embodiment of a flexible display module according to the related art.
Fig. 2 is a schematic structural diagram of the flexible display module in fig. 1 after being bent.
Fig. 3 is a schematic structural diagram of another exemplary embodiment of a flexible display module according to the related art.
Fig. 4 is a schematic structural diagram of the flexible display module in fig. 3 after being bent.
Fig. 5 is a schematic structural view of a first exemplary embodiment of a flexible display module of the present disclosure.
FIG. 6 is a graph of storage modulus versus frequency for thermoplastic polyurethane obtained by DMA testing.
FIG. 7 is a graph of the change in modulus of polyurethane at different strain rates.
Fig. 8 is a schematic structural view of a second exemplary embodiment of a flexible display module of the present disclosure.
Fig. 9 is a schematic structural view of a third exemplary embodiment of a flexible display module of the present disclosure.
Fig. 10 is a comparative diagram of a ball drop impact simulation of the flexible display module shown in fig. 9 and the flexible display module shown in fig. 1.
Fig. 11 is a schematic structural view of a fourth exemplary embodiment of a flexible display module of the present disclosure.
Reference numerals illustrate:
1. a back support film; 2. a back film; 3. a flexible display panel; 4. a polarizer;
5. an adhesive layer; 51. a first adhesive layer; 52. a second adhesive layer; 53. a third adhesive layer; 54. a fourth adhesive layer;
6. a strain rate sensitive layer; 61. a first strain rate sensitive layer; 62. a second strain rate sensitive layer;
7. a protective film layer; 8. an ultra-thin glass layer; 9. a buffer coating;
101. a first polymer film layer; 102. and a second polymer film layer.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many 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 the example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus detailed descriptions thereof will be omitted. Furthermore, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of an icon to another component, these terms are used in this specification for convenience only, such as in terms of the orientation of the examples described in the figures. It will be appreciated that if the device of the icon is flipped upside down, the recited "up" component will become the "down" component. 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 through another structure.
The terms "a," "an," "the," "said" and "at least one" 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. in addition to the listed elements/components/etc.; the terms "first," "second," and "third," etc. are used merely as labels, and do not limit the number of their objects.
Referring to fig. 1, the flexible display module may include a back support film 1, a back film 2 is disposed on one side of the back support film 1, a flexible display panel 3 is disposed on one side of the back film 2 away from the back support film 1, a polarizer 4 is disposed on one side of the flexible display panel 3 away from the back support film 1, a first adhesive layer 51 is disposed on one side of the polarizer 4 away from the back support film 1, an ultrathin glass layer 8 is disposed on one side of the first adhesive layer 51 away from the back support film 1, a second adhesive layer 52 is disposed on one side of the ultrathin glass layer 8 away from the back support film 1, and a first polymer film layer 101 is disposed on one side of the second adhesive layer 52 away from the back support film 1. Referring to fig. 2, when the flexible display module is folded, since the first polymer film 101 inside the flexible display module is subjected to pressure, according to the euler formula, the buckling critical load is proportional to the film modulus and the film thickness, and when the pressure load exceeds the buckling critical load of the first polymer film 101, buckling wrinkling and peeling of the first polymer film 101 occur, thereby causing a screen failure.
Referring to fig. 3, a first polymer film layer 101 is provided on the side of the first adhesive layer 51 away from the back support film 1, a second adhesive layer 52 is provided on the side of the first polymer film layer 101 away from the back support film 1, and a second polymer film layer 102 is provided on the side of the second adhesive layer 52 away from the back support film 1. Referring to fig. 4, buckling and peeling of the first polymer film layer 101 and the second polymer film layer 102 may occur, thereby causing a screen failure.
The inventors found that: the first polymer film layer 101 and the second polymer film layer 102, which are buckled and peeled, are bonded by an adhesive layer.
The exemplary embodiments of the present disclosure provide a flexible display module, as shown in fig. 5, which may include a flexible display panel 3 and a strain rate sensitive layer 6; the strain rate sensitive layer 6 is provided on one side of the flexible display panel 3, and the modulus of the strain rate sensitive layer 6 increases with an increase in the strain rate.
When the flexible display module is folded, the strain rate is low, the modulus of the strain rate sensitive layer 6 is small, the flexible display module has good flexibility, and the flexible display module is easy to fold; the strain rate sensitive layer 6 presents a glass state at a high strain rate, and at the moment, the modulus of the strain rate sensitive layer 6 is larger and is not easy to deform, so that when the strain rate sensitive layer 6 is subjected to external impact load, the strain rate sensitive layer 6 presents smaller strain and has better impact resistance, and the impact resistance of the whole flexible display module is improved; but also the flexible display panel 3 underneath the strain rate sensitive layer 6.
Referring to fig. 5-11; the flexible display module can comprise a back support film 1, and the back support film 1 can be made of metal aluminum, metal titanium, carbon fiber and the like; a back film 2 is arranged on one side of the back support film 1, and the back film 2 can be made of PI (polyimide), PET (polyethylene terephthalate) or the like; a flexible display panel 3 is provided on the side of the back film 2 remote from the back support film 1, and the flexible display panel 3 may be an OLED (Organic Electroluminescence Display, organic light emitting semiconductor) display panel, a QLED (Quantum Dot Light Emitting Diodes, quantum dot light emitting diode) display panel, or the like.
Taking an OLED display panel as an example, the flexible display panel 3 may include a substrate layer, a plurality of switch units disposed on one side of the substrate layer away from the back support film 1, and a plurality of switch unit arrays arranged; a first electrode, a pixel mediating layer, a light emitting layer and a second electrode are sequentially laminated on one side of the plurality of switch units far from the back support film 1; the first electrode may be an anode, electrically connected to the switching unit; the second electrode may be a cathode.
A polarizer 4 is provided on the side of the flexible display panel 3 remote from the back support film 1.
Referring to fig. 5, a first adhesive layer 51 is provided on a side of the polarizer 4 remote from the back support film 1, and the first adhesive layer 51 may be OCA (Optically Clear Adhesive) optical cement. The side of the first adhesive layer 51 far from the back support film 1 is provided with a protective film layer 7, and the protective film layer 7 may be made of PI (polyimide), PET (polyethylene terephthalate), or the like, that is, the protective film is adhered to the polarizer 4 through the first adhesive layer 51.
The side, far away from the back support film 1, of the protective film layer 7 is coated with the strain rate sensitive layer 6, namely, the strain rate sensitive layer 6 is coated on the side, close to the ultrathin glass layer 8, of the protective film layer 7 through a coating process, and adhesion by using an adhesive layer is avoided, so that the risk that buckling wrinkles and stripping are generated on the film layer adhered by the adhesive layer is avoided.
The material of the strain rate sensitive layer 6 may be one or more of polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), etc., that is, the material of the strain rate sensitive layer 6 may be a single material of polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), or a mixed material of multiple materials of polyvinyl butyral (PVB), ethylene-vinyl acetate copolymer (EVA), polyurethane (PU); the strain rate sensitive layer 6 may also be a composite layer of multiple layers of pure materials, for example, the strain rate sensitive layer 6 may include a PVB layer and an EVA layer, and other combinations will not be described herein. When Polyurethane (PU) is used, thermoplastic Polyurethane (TPU) may be specifically selected.
The modulus of the strain-rate sensitive layer 6 increases with increasing strain rate, i.e. the glass transition of the strain-rate sensitive layer has a typical correlation with the strain rate. The storage modulus versus frequency plot obtained by DMA (Dynamic thermomechanical analysis, dynamic thermo-mechanical analysis) test with reference to the thermoplastic polyurethane shown in fig. 6. Dynamic thermo-mechanical analysis (DMA) measures the mechanical properties of viscoelastic materials as a function of time, temperature or frequency. The sample is subjected to and controlled by periodically (sinusoidally) varying mechanical stresses and is deformed. The storage modulus (Young's modulus) is essentially an indicator of the resilience of a material after deformation, and represents the ability of the material to store elastic deformation energy. The strain rate refers to the line strain or shear strain in units of s that occurs per unit time. In conducting the stress DMA test, the strain rate increases with increasing loading frequency if the strain amplitude remains constant.
Thus, as can be taken from fig. 6, at lower frequencies, i.e. at lower strain rates, the thermoplastic polyurethane is in a high-elastic state and therefore has a lower storage modulus; when the frequency is increased, namely the strain rate is increased, the molecular chain segments in the thermoplastic polyurethane molecules do not relax as soon as the response is made, so that most of the molecular chain segments cannot move, and macroscopic glass transition, namely the transition from a high-elasticity state to a glass state, is shown, so that the storage modulus of the thermoplastic polyurethane is increased, namely the modulus of the thermoplastic polyurethane is increased.
The strain rate sensitive layer 6 presents a high-elastic state under a low strain rate, and at the moment, the strain rate sensitive layer 6 is easy to deform, so that strain energy is absorbed through deformation, for example, when the flexible display module is folded, the strain rate is low, and the strain rate sensitive layer 6 has good flexibility and is easy to fold; and the strain of the second adhesive layer 52 can be effectively reduced by absorbing the strain energy by the strain rate sensitive layer 6, thereby reducing the risk of Peeling of the second adhesive layer 52. The strain rate sensitive layer 6 presents a glass state under a high strain rate, and the strain rate sensitive layer 6 is not easy to deform at the moment, so that when the strain rate sensitive layer 6 is subjected to external impact load, the strain rate sensitive layer 6 presents smaller strain and has better impact resistance, and the impact resistance of the whole flexible display module is improved; but also the underlying film layer of the strain rate sensitive layer 6, for example, the OLED display panel.
Referring to the graph of the change in modulus of polyurethane at different strain rates shown in FIG. 7, the strain rate (engineering strain) of polyurethane can be obtained from the graph from 1s -1 Change to 100s -1 The modulus (engineering stress) increases from 15Mpa to 45Mpa, consistent with the trend of the DMA curve shown in fig. 4, i.e. the modulus of the strain rate sensitive layer 6 increases with increasing strain rate.
With continued reference to fig. 5, a second adhesive layer 52 is disposed on a side of the strain rate sensitive layer 6 away from the back support film 1, and the second adhesive layer 52 may be OCA optical adhesive.
An ultrathin glass layer 8 is arranged on one side of the second adhesive layer, which is far away from the back support film 1, a buffer coating 9 is coated on one side of the ultrathin glass layer 8, which is far away from the back support film 1, and the buffer coating 9 is coated on the ultrathin glass, so that no adhesive layer is arranged between the buffer coating 9 and the ultrathin glass, namely, the buffer coating 9 is coated on one side of the ultrathin glass layer 8, which is far away from the back support film 1, through a coating process, so that the adhesive layer is prevented from being used for adhesion, and the risk of failure caused by buckling and wrinkling and stripping of the buffer coating 9 is reduced; and the buffer coating 9 plays a role of a buffer layer on the surface layer of the ultrathin glass layer 8, so that the risk of failure of the ultrathin glass layer 8 due to impact extrusion load is reduced. In addition, the ultrathin glass layer 8 is arranged on one side, far away from the flexible display panel 3, of the protective film layer 7, and buckling wrinkles are not easy to occur on the ultrathin glass layer 8 due to the fact that the modulus of the ultrathin glass layer 8 is large, and buckling wrinkles are not easy to occur on the protective film layer 7 positioned on the lower layer due to the fact that the extrusion effect of the ultrathin glass layer 8 is achieved.
The material of the buffer coating 9 may include one or more of Polyimide (PI), polyethylene terephthalate (PET), thermoplastic Polyurethane (TPU) and polymethyl methacrylate (PMMA), i.e. the material of the buffer coating 9 may be a single material of Polyimide (PI), polyethylene terephthalate (PET), thermoplastic Polyurethane (TPU) and polymethyl methacrylate (PMMA); the material can also be a plurality of mixed materials in Polyimide (PI), polyethylene terephthalate (PET), thermoplastic Polyurethane (TPU) and polymethyl methacrylate (PMMA); the buffer coating 9 may also be a composite layer of a plurality of pure materials, for example, the buffer coating may comprise a PET layer and a TPU layer, and other combinations are not described herein.
Referring to a structural schematic diagram of a second exemplary embodiment of a flexible display module shown in fig. 8, the main difference between the exemplary embodiment and the first exemplary embodiment is that: the strain rate sensitive layer 6 may be disposed between the first adhesive layer 51 and the protective film layer 7, without the strain rate sensitive layer 6 disposed between the protective film layer 7 and the second adhesive layer; the strain rate sensitive layer 6 is coated on one side of the protective film layer 7 far away from the ultrathin glass layer 8, so that bonding by using an adhesive layer is avoided, and the risk of failure caused by buckling, wrinkling and stripping of the strain rate sensitive layer 6 is reduced; the strain rate sensitive layer 6 is adhered to the polarizer 4 through a third adhesive layer 53, the protective film layer 7 is adhered to the ultrathin glass layer 8 through a fourth adhesive layer 54, and the third adhesive layer 53 and the fourth adhesive layer 54 can be OCA optical cement. Similarly, the flexible display panel 3 can be ensured to have enough flexibility and can be folded through the strain rate sensitive layer 6, so that the flexible display module has good impact resistance and can protect the flexible display panel 3; but also by means of the strain-rate sensitive layer 6, strain energy can be absorbed, thereby reducing the risk of the third adhesive layer 53 peeling off when bending.
Referring to a structural schematic diagram of a third exemplary embodiment of a flexible display module shown in fig. 9, the main difference between the exemplary embodiment and the first exemplary embodiment is that: the strain rate sensitive layer 6 may be provided as two layers, a first strain rate sensitive layer 61 and a second strain rate sensitive layer 62, respectively. Two strain rate sensitive layers 6 are coated on two opposite sides of the protective film layer 7, for example, a first strain rate sensitive layer 61 is arranged between the protective film layer 7 and the first bonding layer 51, a second strain rate sensitive layer 62 is arranged between the protective film layer 7 and the second bonding layer, namely, the first strain rate sensitive layer 61 is coated on one side of the protective film layer 7 close to the ultrathin glass layer 8, and the second strain rate sensitive layer 62 is coated on one side of the protective film layer 7 far away from the ultrathin glass layer 8, so that bonding by using the bonding layer is avoided, and the risk of failure caused by buckling and peeling of the first strain rate sensitive layer 61 and the second strain rate sensitive layer 62 is reduced; the first strain rate sensitive layer 61 is adhered to the ultrathin glass layer 8 through the first adhesive layer 51, the second strain rate sensitive layer 62 is adhered to the polarizer 4 through the second adhesive layer 52, and the first adhesive layer 51 and the second adhesive layer 52 can be OCA optical cement. Similarly, the two strain rate sensitive layers 6 can ensure that the flexible display panel 3 has enough flexibility and can be folded, so that the flexible display module has good impact resistance and can protect the flexible display panel 3; and the first strain-rate sensitive layer 61 can absorb strain energy, so that the risk of peeling of the first adhesive layer 51 during bending is reduced, and the second strain-rate sensitive layer 62 can absorb strain energy, so that the risk of peeling of the second adhesive layer 52 during bending is reduced.
Referring to a flexible display module shown in FIG. 9 and a folding simulation comparison table of the flexible display module shown in FIG. 1, wherein the strain rate during folding is 1s -1 ，
List one
| Category of flexible display module | Flexible display module of FIG. 1 | Fig. 9 shows a flexible display module |
| - | Maximum strain (unit:%) | Maximum strain (unit:%) |
| First adhesive layer 51 | 136 | 125.4 |
| Second adhesive layer 52 | 143.4 | 131 |
From table one can be obtained: the flexible display module can effectively reduce the maximum strain of the first adhesive layer 51 and the second adhesive layer 52, thereby reducing the Peeling risk of the first adhesive layer 51 and the second adhesive layer 52.
Referring to a comparative graph of the ball drop impact simulation of the flexible display module shown in fig. 9 and the flexible display module shown in fig. 1, it can be obtained from the graph: the safety ball falling height of the flexible display module shown in fig. 1 is about 6cm, and the safety ball falling height of the flexible display module shown in fig. 9 is about 15cm, so that the 9cm of impact resistance of the flexible display module is improved.
In addition, in other example embodiments of the present disclosure, the protective film layer 7 may not be provided. Referring to fig. 11, a first strain rate sensitive layer 61 is coated on a side of the polarizer 4 away from the back support film 1, that is, the first strain rate sensitive layer 61 is coated on a side of the polarizer 4 away from the back support film 1 by a coating process, so that adhesion by using an adhesive layer is avoided, and the risk of peeling of the adhesive layer is avoided. The second strain rate sensitive layer 62 is coated on the side of the ultrathin glass layer 8 far away from the buffer coating 9, namely, the second strain rate sensitive layer 62 is coated on the side of the ultrathin glass layer 8 far away from the buffer coating 9 through a coating process, so that the bonding of an adhesive layer is avoided, and the risk of peeling of the adhesive layer is avoided.
An adhesive layer 5 is disposed between the first strain rate sensitive layer 61 and the second strain rate sensitive layer 62, that is, the first strain rate sensitive layer 61 and the second strain rate sensitive layer 62 are adhered by the adhesive layer 5, and the adhesive layer 5 may be OCA optical adhesive.
Similarly, the two strain rate sensitive layers 6 can ensure that the flexible display panel 3 has enough flexibility and can be folded, so that the flexible display module has good impact resistance and can protect the flexible display panel 3; and the strain energy can be absorbed by the first strain rate sensitive layer 61 and the second strain rate sensitive layer 62, thereby reducing the risk of peeling off the adhesive layer 5 when bending.
It should be noted that, more layers may be disposed on the strain rate sensitive layer 6, and the positions thereof may also be set according to needs, which is not described in detail herein.
Based on the same inventive concept, the exemplary embodiments of the present disclosure provide a display device, which may include the flexible display module set described in any one of the above. The specific structure of the flexible display module has been described in detail above, and therefore, will not be described here again.
The specific type of the display device is not particularly limited, and the type of the display device commonly used in the art may be, for example, a mobile device such as a mobile phone, a wearable device such as a watch, a VR device, etc., and those skilled in the art may select the display device accordingly according to the specific application of the display device, which is not described herein again.
It should be noted that, the display device includes other necessary components and components besides the flexible display module, such as a housing, a circuit board, a power cord, etc., and those skilled in the art can correspondingly supplement the components and components according to the specific usage requirements of the display device, which is not described herein.
Compared with the prior art, the display device provided by the example embodiment of the application has the same beneficial effects as the flexible display module provided by the above example embodiment, and is not described herein.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
Claims (7)
1. A flexible display module, comprising:
a flexible display panel;
the strain rate sensitive layer is arranged on one side of the flexible display panel, and the modulus of the strain rate sensitive layer is increased along with the increase of the strain rate;
the ultrathin glass layer is arranged on one side of the strain rate sensitive layer, which is far away from the flexible display panel;
a buffer coating layer coated on one side of the ultra-thin glass layer far from the flexible display panel;
the protective film layer is arranged on one side of the ultrathin glass layer, which is close to the flexible display panel;
the strain rate sensitive layer is coated on one side of the protective film layer, which is close to and/or far from the ultrathin glass layer.
2. The flexible display module of claim 1, wherein the strain rate sensitive layer comprises one or more of polyvinyl butyral, ethylene vinyl acetate copolymer, polyurethane.
3. The flexible display module of claim 1, wherein the buffer coating comprises one or more of polyimide, polyethylene terephthalate, thermoplastic polyurethane, and polymethyl methacrylate.
4. The flexible display module according to claim 1, wherein when the strain rate sensitive layer is coated on a side of the protective film layer near the ultra-thin glass layer, a first adhesive layer is provided between the strain rate sensitive layer and the ultra-thin glass layer, and a second adhesive layer is provided between the protective film layer and the flexible display panel; or when the strain rate sensitive layer is coated on one side, far away from the ultrathin glass layer, of the protective film layer, a third bonding layer is arranged between the strain rate sensitive layer and the flexible display panel, and a fourth bonding layer is arranged between the protective film layer and the ultrathin glass layer.
5. The flexible display module of claim 1, wherein when the strain rate sensitive layer is coated on a side of the protective film layer near to and far from the ultra-thin glass layer, the strain rate sensitive layer comprises a first strain rate sensitive layer and a second strain rate sensitive layer, the first strain rate sensitive layer is coated on a side of the protective film layer near to the ultra-thin glass layer, the second strain rate sensitive layer is coated on a side of the protective film layer far from the ultra-thin glass layer, a first adhesive layer is arranged between the first strain rate sensitive layer and the ultra-thin glass layer, and a second adhesive layer is arranged between the second strain rate sensitive layer and the flexible display panel.
6. The flexible display module of claim 1, wherein the flexible display module further comprises:
the polaroid is arranged on one side of the flexible display panel, which is close to the strain rate sensitive layer;
a back film disposed on a side of the flexible display panel away from the strain rate sensitive layer;
and the back support film is arranged on one side of the back film, which is far away from the flexible display panel.
7. A display device, comprising: the flexible display module of any one of claims 1-6.
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| US9723714B2 (en) * | 2015-10-20 | 2017-08-01 | Flexterra, Inc. | Electronic circuit device having a protective backing for low-velocity impacts and high-velocity impacts |
| JP2021148834A (en) * | 2020-03-16 | 2021-09-27 | 株式会社Joled | Display device and electronic apparatus |
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| CN104680958A (en) * | 2013-12-02 | 2015-06-03 | 三星显示有限公司 | Flexible display apparatus and image display method of the same |
| CN109070530A (en) * | 2016-04-26 | 2018-12-21 | 道康宁东丽株式会社 | Flexible laminated body and the flexible display for having it |
| CN112543964A (en) * | 2019-05-20 | 2021-03-23 | 株式会社Lg化学 | Cover window for flexible display device and flexible display device |
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