CN115050263B - Flexible cover plate, display panel and display device - Google Patents
Flexible cover plate, display panel and display device Download PDFInfo
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- CN115050263B CN115050263B CN202210677581.7A CN202210677581A CN115050263B CN 115050263 B CN115050263 B CN 115050263B CN 202210677581 A CN202210677581 A CN 202210677581A CN 115050263 B CN115050263 B CN 115050263B
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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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- 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
- G09F9/33—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 being semiconductor devices, e.g. diodes
- G09F9/335—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 being semiconductor devices, e.g. diodes being organic light emitting diodes [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
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- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Electroluminescent Light Sources (AREA)
- Laminated Bodies (AREA)
Abstract
The application provides a flexible cover plate, a display panel and a display device, wherein the flexible cover plate comprises: a cover plate layer and a flexible structure layer which are laminated; the flexible structure layer has a first elastic modulus along a thickness direction thereof and a second elastic modulus along an extension direction thereof perpendicular to the thickness direction; the first elastic modulus is greater than the second elastic modulus. Therefore, when the flexible cover plate is applied to the flexible display panel, the bending and folding performances of the flexible display panel can be guaranteed by the low elastic modulus in the extending direction of the flexible structure layer perpendicular to the thickness direction, and meanwhile, the hardness of the flexible display panel can be improved by the high elastic modulus in the thickness direction of the flexible structure layer, and the scratch resistance and pen dropping performances of the flexible display panel are improved.
Description
Technical Field
The application relates to a flexible cover plate, a display panel and a display device, and belongs to the technical field of luminous display.
Background
With the continuous development of display technology, flexible display technology is also in continuous maturity, and flexible display devices can meet various display requirements because they can be bent or folded, so they are widely used in various fields.
In the prior art, the components inside the flexible display panel are connected through optical transparent adhesive (Optically Clear Adhesive, OCA), and meanwhile, the stress of the flexible display panel when being bent or folded is released, so that the bending performance is ensured, and the flexible display panel connected through the OCA in the prior art has the problems of low pencil hardness, scratch resistance and poor pen dropping performance.
Disclosure of Invention
The application provides a flexible cover plate, a display panel and a display device, which are used for solving the problems of low hardness, poor scratch resistance and poor pen dropping performance of the flexible display panel and the flexible display device in the prior art.
The application provides a flexible cover plate, which comprises a cover plate layer and a flexible structure layer which are arranged in a stacked manner;
the flexible structure layer has a first elastic modulus along a thickness direction thereof and a second elastic modulus along an extension direction thereof perpendicular to the thickness direction;
the second elastic modulus is greater than the first elastic modulus.
The flexible cover plate as described above, optionally, the flexible structural layer includes a structural body and a filler dispersedly filled in the structural body;
the filler has a modulus of elasticity greater than the modulus of elasticity of the structural body.
The flexible cover plate as described above, optionally, the structural body is a mesh structure, and the filler is dispersedly filled in the mesh of the structural body.
The flexible cover sheet as described above, optionally, the cover sheet layer comprises a first cover sheet sub-layer and a second cover sheet sub-layer, and the flexible structural layer comprises a first flexible structural sub-layer and a second flexible structural sub-layer;
the first cover plate sub-layer, the first flexible structure sub-layer, the second cover plate sub-layer and the second flexible structure sub-layer are sequentially stacked, and the first cover plate sub-layer is used as a contacted layer at the outermost side of the flexible structure layer;
the elastic modulus in the thickness direction of the first flexible structure sub-layer is greater than the elastic modulus in the thickness direction of the second flexible structure sub-layer;
as described above, optionally, the elastic modulus of the first flexible structural sublayer in the extension direction perpendicular to the thickness direction is greater than the elastic modulus of the second flexible structural sublayer in the extension direction perpendicular to the thickness direction.
Optionally, the thickness of the second flexible structural sublayer is greater than the thickness of the first flexible structural sublayer, as described above.
The flexible cover plate as described above, optionally, the flexible cover plate includes a bending region and a non-bending region along an extension direction thereof;
the mesh density of the structural body of the flexible structural layer in the bending region is smaller than that of the structural body of the flexible structural layer in the non-bending region.
Optionally, the flexible cover plate as described above, the elastic modulus of the structural body of the first flexible structural sublayer is greater than the elastic modulus of the structural body of the second flexible structural sublayer.
The present application also provides a flexible display panel including: and the light emergent side of the display layer is provided with the flexible cover plate.
The flexible display panel as described above, optionally, further comprises a flexible substrate disposed on a backlight side of the display layer, the flexible substrate includes a non-metal support layer disposed on a side of the flexible substrate away from the display layer, and a material of the non-metal support layer includes one or more of a nylon material, a carbon fiber composite material, or a fabric material.
The application also provides a flexible display device which comprises any one of the flexible display panels.
The application provides a flexible cover plate, a display panel and a display device, wherein the flexible cover plate comprises: comprises a cover plate layer and a flexible structure layer which are stacked; the flexible structure layer has a first elastic modulus along a thickness direction thereof and a second elastic modulus along an extension direction thereof perpendicular to the thickness direction; the first elastic modulus is greater than the second elastic modulus. Therefore, when the flexible cover plate is applied to the flexible display panel, the bending and folding performances of the flexible display panel can be guaranteed by the low elastic modulus in the extending direction of the flexible structure layer perpendicular to the thickness direction, and meanwhile, the hardness of the flexible display panel can be improved by the high elastic modulus in the thickness direction of the flexible structure layer, and the scratch resistance and pen dropping performances of the flexible display panel are improved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. Furthermore, these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
FIG. 1 is a schematic view of a flexible cover plate according to an embodiment of the present application;
FIG. 2 is a schematic perspective view of a flexible cover plate according to an embodiment of the present application;
FIG. 3 is a schematic view of a flexible cover sheet according to an embodiment of the present application;
FIG. 4 is a schematic view of a structure of a main body of a flexible structure layer in a flexible cover plate according to an embodiment of the present application;
FIG. 5 is a schematic diagram of a structure of an embodiment of the filling material added to a main body of a flexible structure layer in a flexible cover plate according to an embodiment of the present application;
FIG. 6 is a schematic view of another embodiment of a flexible cover plate according to an embodiment of the present application;
FIG. 7 is a schematic diagram showing a structure of a cover plate in a bent state according to an embodiment of the application;
FIG. 8 is a schematic diagram of a flexible display panel according to an embodiment of the present application;
fig. 9 is a schematic structural view of another implementation of the flexible display panel according to the embodiment of the present application.
Reference numerals illustrate:
100-flexible cover plate;
110-a cover sheet layer;
111-a first cover sub-layer;
112-a second cover sub-layer;
120-a flexible structural layer;
121-a first flexible structural sublayer;
122-a second flexible structural sublayer;
120 a-a structural body;
120 b-filler;
200-display layer;
300-a flexible substrate;
310-a non-metallic support layer;
320-supporting the buffer layer;
400-polarizing layer.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present application more apparent, the technical solutions in the embodiments of the present application will be clearly and completely described in the following in conjunction with the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application. The following embodiments and features of the embodiments may be combined with each other without conflict.
The flexible cover plate is also capable of realizing bending, and can realize the basic function of being bent, so that not only is the flexible cover plate internal device required to be flexible, but also the structure for connecting the flexible cover plate internal device or connecting the flexible cover plate with other components is required to be flexible, in the field, the components in the flexible cover plate are generally connected by OCA glue, and the flexible cover plate and other panel components are connected, in the bending process of the flexible cover plate, the OCA glue generates larger deformation in the extending direction due to low elastic modulus (generally 30-50 KPa), and stress is released, so that the flexible cover plate is ensured to have good bending performance. However, since OCA is isotropic, the elastic modulus in all directions is low when the elastic modulus in the extending direction is low, so that the flexible cover plate has the problems of low hardness and poor scratch resistance and pen dropping performance.
In view of the above problems, embodiments of the present application provide a flexible cover plate, a flexible display panel, and a flexible display device, which are used for improving hardness, and further improving scratch resistance and pen-down performance.
Exemplary Flexible cover sheets
Fig. 1 is a schematic structural diagram of an implementation manner of a flexible cover plate in an embodiment of the present application, and fig. 2 is a schematic structural diagram of a perspective view of an implementation manner of a flexible cover plate in an embodiment of the present application, as shown in fig. 1 and fig. 2, where the embodiment provides a flexible cover plate 100, including a cover plate layer 110 and a flexible structural layer 120 that are stacked; the flexible structure layer 120 has a first elastic modulus along its thickness direction and a second elastic modulus along its extension direction perpendicular to the thickness direction, and the first elastic modulus is greater than the second elastic modulus.
First, the extending direction and the thickness direction of the flexible structure layer 120 are explained, as shown in fig. 2, the thickness direction S of the flexible structure layer 120 is a direction perpendicular to the plane of the flexible structure layer 120, the extending direction N perpendicular to the thickness direction is a plane direction of the flexible structure layer 120, the first elastic modulus is an elastic modulus in a direction perpendicular to the plane of the flexible structure layer 120, and the second elastic modulus is an elastic modulus in a plane direction of the flexible structure layer 120. For example, when the flexible structure layer 120 is placed horizontally, the first elastic modulus is the elastic modulus in the vertical direction, and the second elastic modulus is the elastic modulus in the horizontal direction. That is, in the flexible cover plate 100 provided by the embodiment of the application, when the flexible structure layer 120 is placed horizontally, the elastic modulus of the flexible structure layer 120 in the vertical direction is greater than the elastic modulus of the flexible structure layer 120 in the horizontal direction.
It should be noted that, in order to achieve bending, the cover sheet layer 110 is required to have flexibility, bending capability, and in the second place, the flexible structure layer 120 for connecting the cover sheet layer 110 is required to be easily deformed in the extending direction perpendicular to the thickness direction during bending, so that the flexible structure layer 120 is required to have a low elastic modulus in the extending direction perpendicular to the thickness direction.
However, in the prior art, because of isotropy of the flexible structural layer, when the elastic modulus in the extending direction perpendicular to the thickness direction is low, the elastic modulus in each direction is relatively low, resulting in low pencil hardness of the flexible cover plate and poor scratch and drop resistance.
In the solution provided in the embodiment of the present application, the cover plate layer 110 may be made of polyimide film (CPI/HC), polyethylene terephthalate (polyethylene glycol terephthalate, PET)/HC film or ultra-thin glass UTG material coated with hard particle coating, so as to ensure flexibility of the cover plate layer 110.
For the flexible structural layer 120 disposed on the cover layer 110, since the flexibility of the flexible cover 100 needs to be ensured and the bending capability is ensured, the flexible structural layer 120 needs to have a lower elastic modulus in the extending direction perpendicular to the thickness direction, but the elastic modulus of the flexible structural layer 120 in the thickness direction can be increased, so that the pencil hardness of the flexible cover 100 is filled, and the scratch resistance and the pen drop resistance of the flexible cover 100 are improved.
In some embodiments, a filler of high elastic modulus may be added to the structural body of flexible structural layer 120, and in other embodiments, a material may be used that itself has an elastic modulus in the thickness direction that is greater than the elastic modulus in the direction of extension perpendicular to the thickness direction. In still other embodiments, flexible structure layer 120 may have a greater modulus of elasticity in the thickness direction than in the direction of extension perpendicular to the thickness direction, by various composite materials or composite structures.
According to the flexible cover plate provided by the embodiment of the application, the flexible structure layer 120 has a lower elastic modulus in the extending direction perpendicular to the thickness direction, so that the flexible cover plate 100 can be ensured to be easily deformed in the extending direction N of the flexible structure layer perpendicular to the thickness direction in the bending process, the stress is released, and the bending performance of the flexible cover plate 100 is ensured; meanwhile, the flexible structure layer 120 has higher elastic modulus in the thickness direction, so that the hardness of the flexible cover plate 100 can be improved, and the scratch resistance and the pen dropping performance of the flexible cover plate are improved.
Fig. 3 is a schematic structural diagram of an implementation of a flexible structural layer in a flexible cover board according to an embodiment of the present application, and as shown in fig. 3, the flexible structural layer 120 may include a structural body 120a and fillers 120b dispersed and filled in the structural body 120 a. The structural body 120a may be an isotropic gel, such that the filler 120b is directly filled on the structural body 120 a. The structural body 120a may have a slit inside, and the filler 120b may be filled in the slit. The elastic modulus of the filler 120b is greater than that of the structural body 120a, and the filler 120b is filled on the structural body 120b so that the elastic modulus of the flexible structural layer 120 in the thickness direction thereof is greater than that of the flexible structural layer 120 in the extension direction thereof perpendicular to the thickness direction.
In some embodiments, an optical cement material may be used as the material of the structural body 120a, where the optical cement material includes an acrylic compound, a polyurethane compound, a silica gel material, and the like, and the filler 120b includes a material with a high elastic modulus, and the material with a high elastic modulus includes a compact group or a nano-sized particle material with a higher hardness. The flexible structural layer 120 having a greater elastic modulus in the thickness direction than in the extension direction perpendicular to the thickness direction can be obtained by filling the structural body 120a with a substance having a high elastic modulus, and the specific magnitude of the elastic modulus in the thickness direction can be controlled by controlling the elastic modulus and the amount of the filler 120b.
In some embodiments, the structural body 120a may also be a material with slits inside prepared by design. The filler 120b may be filled in the gaps on the structural body 120a, so that it is easier to combine with the structural body 120a, and the number and density of the filler 120b on the structural body 120a may be further controlled by adjusting the size and density of the gaps of the structural body 120a, so that it is easier to control the specific size of the elastic modulus of the flexible structural layer 120 in the thickness direction thereof.
It should be noted that, the filling manner of the filler 120b into the structural body 120a may be achieved by chemical or physical means, such as heating or stirring in a specific state or in a specific solution, so that the filler 120b is dispersed and filled on the structural body 120a, and the specific filling manner is not limited in the present application.
In addition, since the filler 120b is dispersed and filled in the structural body 120a, the elastic modulus of the flexible structural layer 120 in the thickness direction thereof can be further controlled by adjusting the shape, the number, and the elastic modulus of the filler 120b. The elastic modulus in the extending direction perpendicular to the thickness direction is still mainly determined by the material structure of the structural body 120a, so that the structural body 120a can be better stretched and deformed when the flexible cover plate 100 is bent, and the elastic modulus of the flexible structural layer 120 in the thickness direction is more flexibly controlled on the basis that the flexible structural layer is kept flexible in the extending direction perpendicular to the thickness direction.
Fig. 4 is a schematic structural diagram of an embodiment of a structural body of a flexible structural layer in a flexible cover plate according to an embodiment of the present application, and fig. 5 is a schematic structural diagram of an embodiment of adding a filler to a structural body of a flexible structural layer in a flexible cover plate according to an embodiment of the present application, as shown in fig. 4 and fig. 5, where, on the basis of the above embodiment, a structural body 120a in a flexible structural layer 120 according to an embodiment of the present application may also be a mesh structure.
Specifically, the flexible structure layer 120 may be made of the above-mentioned materials, including acrylic, polyurethane compounds, or silica gel materials, and the like, and may be heated and cured, or UV cured by introducing a photoinitiator, so as to react and change the organic branches, thereby forming the above-mentioned materials into a network structure and obtaining a network-shaped structural body. The filler 120b may employ small dense groups or harder nanoscale particulate materials such as metal oxides of Si, al, and Ga, and the like. The structural body 120a of the above-mentioned net structure is mixed with the filler 120b to generate chemical reaction, or the filling of the groups or nano-sized particulate matters into the meshes of the net structural body is realized by heating or stirring in a specific solution, etc., and the present application is not limited to a specific filling manner.
In this way, the modulus of elasticity in the thickness direction of the flexible structure layer 120 is higher than the modulus of elasticity in the extension direction perpendicular to the thickness direction, so that the hardness is increased while the good bending performance is maintained, and the scratch resistance and the pen drop performance are improved. Moreover, since the structural body 120a is a net structure, the filler 120b can be more easily filled into the mesh of the structural body 120a, the filling is more uniform, and the flatness of the plane of the flexible structural layer 120 can be maintained. In addition, since the fluidity of the mesh structure is more moderate relative to the OCA in the extending direction perpendicular to the thickness direction, the flexible structure layer 120 can ensure the bending performance, and at the same time, reduce the fluidity to a proper extent, avoid deformation due to heating or extrusion scraping, and further improve the scratch resistance.
Further, in the solution provided in the embodiment of the present application, the cover layer 110 and the flexible structure layer 120 may be one or more layers, and the layers may be the same or different, and may be flexibly changed according to practical application requirements. FIG. 6 is a schematic structural diagram of another embodiment of a flexible cover board according to an embodiment of the present application, as shown in FIG. 6, in which a cover board layer 110 includes a first cover board sub-layer 111 and a second cover board sub-layer 112, and a flexible structural layer 120 includes a first flexible structural sub-layer 121 and a second flexible structural sub-layer 122; the first cover sub-layer 111, the first flexible structure sub-layer 121, the second cover sub-layer 112 and the second flexible structure sub-layer 122 are sequentially stacked, and the first cover sub-layer is used as a contacted layer on the outermost side of the flexible structure layer. The elastic modulus in the thickness direction of the first flexible structural sublayer 122 is greater than the elastic modulus in the thickness direction of the second flexible structural sublayer 121.
In the flexible cover plate 100 provided in the embodiment of the present application, the cover plate layer 110 includes a first cover plate sub-layer 111 and a second cover plate sub-layer 112, a first flexible structure sub-layer 121 is disposed between the first cover plate sub-layer 111 and the second cover plate sub-layer 112, and a second flexible structure sub-layer 122 is disposed below the second cover plate sub-layer 112, which should be noted that the flexible structure layer may be disposed on the cover plate layer. The first flexible structure sub-layer 121 is used to connect the first cover sub-layer 111 and the second cover sub-layer 112, or other components between the two cover sub-layers, and the second flexible structure sub-layer 122 is used to connect the flexible cover 100 with other components constituting the flexible display panel, and the first cover sub-layer is the contacted layer on the outermost side of the flexible structure layer.
Specifically, the materials of the first cover sub-layer 111 and the second cover sub-layer 112 may be the same or different. The material of the first cover sub-layer 111 may be a CPT/HC film or a PET/HC film, and the material of the second cover sub-layer 112 may be a CPT/HC film or a PET/HC film, or an ultrathin glass UTG.
It should be noted that, the first flexible structural sublayer 121 and the second flexible structural sublayer 122 both have the characteristics of the flexible structural layers in the above embodiments, that is, by adding the filler with high elastic modulus on the main body of the mesh structure, the elastic modulus in the thickness direction of the filler is greater than the elastic modulus in the extending direction perpendicular to the thickness direction of the filler, so that the bending performance is ensured, the hardness is improved, and the scratch resistance and the pen drop resistance are improved. By providing a plurality of cover sheet layers and flexible structural layers, a variety of different display requirements can be satisfied.
In other embodiments of the present application, the elastic modulus of the first flexible structure sub-layer 121 is greater than the elastic modulus of the second flexible structure sub-layer 122 in the thickness direction.
It should be explained that, generally, the first flexible structural sub-layer 121 located at the upper layer is used as the bonding part at the outermost layer, the impact on hardness, pen drop and scratch resistance of the flexible cover plate is larger, while the second flexible structural sub-layer 122 located at the lower layer receives smaller scratch force than the first flexible structural sub-layer 121, and has smaller impact on pen drop performance and scratch resistance, but the second flexible structural sub-layer 122 located at the lower layer is located at a position further inside the panel when the panel is formed, so that the impact on releasing stress, reducing internal stress of the flexible display panel and maintaining good bending performance is larger.
Therefore, on the basis of the above embodiment, in order to further improve the hardness of the flexible cover plate and improve the scratch resistance and bending resistance of the flexible cover plate, the elastic modulus of the first flexible structural sublayer 121 above in the thickness direction of the first flexible structural sublayer may be further increased, so that the scratch resistance of the flexible cover plate is better improved; in contrast, since the lower layer has a low influence on scratch resistance, and in order to secure good bending performance and improve stress relief capability, the elastic modulus in the thickness direction of the second flexible structural sublayer 122 may be set smaller than that of the first flexible structural sublayer 121 on the basis of the above-described embodiment. By making the elastic modulus in the thickness direction of the first flexible structural sublayer 121 greater than the elastic modulus in the thickness direction of the second flexible structural sublayer 122, it is possible to achieve an improvement in hardness of the flexible cover plate, an improvement in pen-down performance and scratch resistance, and an improvement in the capability of releasing the stress between the film layers, and a smaller internal structure.
Further, based on the same reasons and theory, the elastic modulus of the first flexible structural sublayer 121 in the extending direction perpendicular to the thickness direction may be greater than the elastic modulus of the second flexible structural sublayer 122 in the extending direction perpendicular to the thickness direction, so as to further improve the hardness of the flexible cover plate, improve the pen-down performance and scratch resistance performance of the flexible cover plate, and ensure the capability of releasing the stress between the film layers.
Specifically, in some embodiments of the present application, the elastic modulus of the first flexible structure sublayer 121 in the extending direction perpendicular to the thickness direction may be 30-50KPa, the elastic modulus in the thickness direction may be 200-300KPa, the elastic modulus of the second flexible structure sublayer 122 in the extending direction perpendicular to the thickness direction may be 10-30KPa, and the elastic modulus in the thickness direction may be 50-150KPa.
In order to achieve the above objective, in some specific implementations, more filler may be added to the second flexible structural sublayer 122, or filler with higher elastic modulus may be added, and the first flexible structural sublayer 121 may use a material with a large elastic modulus as the structural body, and the second flexible structural sublayer 122 uses a material with a small elastic modulus as the structural body.
In the embodiment of the present application, according to different requirements, the first flexible structural sublayer 121 located on the upper layer is designed to have a higher elastic modulus in both the thickness direction and the extension direction perpendicular to the thickness direction than that of the second flexible structural sublayer 122. Compared with two identical flexible structural layers, the characteristics of the two flexible structural layers are adjusted according to different requirements, so that the functional emphasis point is different, and the performance of releasing the stress between the film layers is better while the hardness of the flexible cover plate is higher, the pen dropping performance and the scratch resistance are better.
Further, in the flexible cover plate according to the embodiment of the present application, the thickness of the second flexible structural sublayer 122 may be greater than the thickness of the first flexible structural sublayer 122.
As mentioned in the above embodiments, since the second flexible structural sublayer 122 below has a greater influence on releasing the internal stress of the flexible cover plate, while the first flexible structural sublayer 121 has a greater influence on scratch resistance and pen drop performance, and increasing the thickness of the flexible structural layer can also significantly increase the capability of releasing stress of the flexible structural layer, in other embodiments of the present application, the thickness of the second flexible structural sublayer 122 can be greater than that of the first flexible structural sublayer 121, and on the basis of affecting the thickness of the flexible cover plate 100 to be smaller, the performance of releasing stress inside the flexible cover plate can be further and effectively improved, and the bending performance of the flexible cover plate can be improved. For example, the first flexible structure sub-layer 121 has a thickness of 5-50um, and the second flexible structure sub-layer 122 has a thicker region, for example, 50-100um.
Fig. 7 is a schematic structural diagram of a cover plate in a bent state in an embodiment of the present application, as shown in fig. 7, in other embodiments of the present application, in order to better enhance the use experience of the flexible cover plate, a bending area and a non-bending area of the flexible cover plate along an extending direction perpendicular to a thickness direction of the flexible cover plate may be further distinguished, and a mesh density of a structural body of a flexible structural layer in the bending area is smaller than that of a structural body of a flexible structural layer in the non-bending area.
Specifically, in the embodiment of the present application, the flexible structural layer of the bending region b may adopt a structural body with smaller mesh density, so as to reduce the density of the filler in the mesh, make the bending region b easier to bend, and reduce the bending force of the user; the flexible structural layer of the non-bending region a can adopt a structural main body with larger mesh density, so that the density of the filler is increased, the modulus of the non-bending region a is larger, the hardness of the non-bending region b in the vertical direction is higher, and the scratch resistance and the pen dropping performance of the flexible cover plate are improved.
Exemplary Flexible display Panel
The present embodiment provides a flexible display panel, and fig. 8 is a schematic structural diagram of one implementation of the flexible display panel in the embodiment of the present application; as shown in fig. 8, the flexible display panel includes a display layer 200, and the flexible cover plate 100 in the above embodiment is disposed on the light emitting side of the display layer 200. The flexible cover 100 is the flexible cover in the above embodiments, and includes a cover layer 110 and a flexible structural layer 120. The structure, function and implementation of the flexible cover plate may be the same as those of the above embodiments, and will not be described herein again. By making the elastic modulus of the flexible structure layer 120 in the flexible cover plate 100 in the thickness direction thereof larger than the elastic modulus in the extension direction perpendicular to the thickness direction thereof, the flexible display panel can ensure good bending performance in the extension direction perpendicular to the thickness direction, and has higher hardness in the thickness direction, thereby improving scratch resistance and pen-down performance of the flexible display panel.
Further, in some embodiments of the present application, the flexible display panel further includes a flexible substrate 300 disposed on the backlight side of the display layer 200, where the flexible substrate 300 includes a non-metal support layer 310 stacked on the side of the flexible substrate away from the display layer 200, and the material of the non-metal support layer 310 includes one or more of nylon material, carbon fiber composite material, fabric material, and aramid fiber, where the carbon fiber composite material may be carbon nanofiber or carbon nanotube, and the modulus and hardness are similar to those of metal stainless steel. By providing the nonmetallic support layer 310 with modulus and hardness similar to those of metallic stainless steel, the flexible display panel has better flexibility and fatigue resistance, and folds of the flexible display panel can be greatly reduced.
Fig. 9 is a schematic structural diagram of another implementation of the flexible display panel according to the embodiment of the present application, and as shown in fig. 9, the flexible display panel includes the flexible cover plate described above, including the first cover plate sub-layer 111, the first flexible structure sub-layer 121, the second cover plate sub-layer 112, the second flexible structure sub-layer 122, and the display layer 200 and the flexible substrate 300. The first cover plate sub-layer is used as a contacted layer at the outermost side of the flexible structure layer; the flexible substrate 300 includes the non-metallic support layer 310 mentioned in the embodiments above.
In other embodiments, a supporting buffer layer 320 may be further disposed on the non-metal supporting layer 310, where the supporting buffer layer 320 may include a supporting film (BPF) and a buffer material, such as foam, for buffering the force in the flexible cover plate, improving the user experience, and increasing the service life of the flexible display panel.
In addition, in other embodiments, a polarizing layer 400 may be further disposed between the display layer 200 and the flexible cover plate 100, and the polarizing layer 400 includes a polarizer to improve the display effect.
It should be noted that, in practical application, the above layers may be appropriately increased or decreased according to practical requirements or technical development, which is not described in detail herein.
In the flexible display panel provided in this embodiment, the two flexible structural layers are filled with the filler with high modulus into the mesh-shaped structural body, so that the elastic modulus in the thickness direction of the flexible structural layers is greater than the elastic modulus in the extension direction perpendicular to the thickness direction of the flexible structural layers, and the flexibility is not reduced, and meanwhile, the hardness is increased, and the scratch resistance and the pen-down resistance are improved. Meanwhile, the elastic modulus in the thickness direction of the first flexible structure sub-layer 121 at the upper layer is made to be larger than the elastic modulus in the thickness direction of the second flexible structure sub-layer 122 at the lower layer, the elastic modulus in the extending direction of the first flexible structure sub-layer 121 perpendicular to the thickness direction is made to be larger than the elastic modulus in the extending direction of the second flexible structure sub-layer 122 perpendicular to the thickness direction, and the thickness of the second flexible structure sub-layer 122 at the lower layer is improved, so that the hardness of the flexible display panel is higher, the pen dropping performance and scratch resistance performance are better, and meanwhile, the effect of releasing internal stress and reducing internal stress is also better. Further, by providing the non-metal support layer 310, the folds of the flexible display panel during use can be effectively reduced. And by providing the supporting buffer layer 320, the force in the flexible display panel is buffered, improving the service life of the flexible display panel.
Through experimental tests, the flexible display panel provided by the embodiment of the application can bear at least 2500 times of experiments in the aspect of scratch resistance, and is greatly improved compared with 1500 times of the traditional flexible display panel; in terms of surface hardness, the flexible display panel provided by the embodiment of the application achieves the H level and is far superior to 10B of the traditional display panel; in addition, in 10 ten thousand bending experiments, the crease of the flexible display panel provided by the embodiment of the application is obviously lighter.
Exemplary Flexible display device
The embodiment provides a flexible display device, which can be an OLED display device, and any product or component with a display function, such as a television, a digital camera, a mobile phone, a tablet computer, a smart watch, an electronic book, a navigator and the like, including the OLED display device.
The flexible display device includes: the flexible display panel in the foregoing embodiment. The structure, function and implementation of the flexible display panel may be the same as those of the embodiments, and will not be repeated here.
In the flexible display device provided in this embodiment, the flexible structural layer fills the high-modulus filler into the mesh-shaped structural body, so that the elastic modulus in the thickness direction of the flexible structural layer is greater than the elastic modulus in the extension direction perpendicular to the thickness direction of the flexible structural layer, and the flexibility is not reduced, but the hardness is increased, and the scratch resistance and the pen-down performance are improved. Meanwhile, the elastic modulus in the thickness direction of the upper flexible structure sublayer is larger than that in the thickness direction of the lower flexible structure sublayer, the elastic modulus in the extending direction of the upper flexible structure sublayer perpendicular to the thickness direction is larger than that in the extending direction of the lower flexible structure sublayer perpendicular to the thickness direction, and the thickness of the lower flexible structure sublayer is increased, so that the hardness of the flexible display device is higher, the pen dropping performance and scratch resistance are better, and meanwhile, the effects of releasing internal stress and reducing internal stress are also better. Further, by arranging the nonmetallic supporting layer, folds of the flexible display device in the using process can be effectively reduced. And by arranging the supporting buffer layer, the force in the flexible display device is buffered, and the service life of the flexible display device is prolonged.
In addition, in the present application, unless explicitly specified and limited otherwise, the terms "connected," "stacked," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and not for limiting the same; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.
Claims (10)
1. A flexible cover plate is characterized by comprising a cover plate layer and a flexible structure layer which are arranged in a stacked manner;
the flexible structure layer has a first elastic modulus along a thickness direction thereof and a second elastic modulus along an extension direction thereof perpendicular to the thickness direction;
the first elastic modulus is larger than the second elastic modulus so as to fill the pencil hardness of the flexible cover plate.
2. The flexible cover sheet of claim 1, wherein the flexible structural layer comprises a structural body and filler dispersed throughout the structural body;
the filler has a modulus of elasticity greater than the modulus of elasticity of the structural body.
3. The flexible cover sheet of claim 2, wherein the structural body is a mesh structure, and the filler is dispersedly filled in the mesh of the structural body.
4. The flexible cover sheet of claim 2 wherein the flexible cover sheet comprises,
the cover plate layer comprises a first cover plate sub-layer and a second cover plate sub-layer, and the flexible structure layer comprises a first flexible structure sub-layer and a second flexible structure sub-layer;
the first cover plate sub-layer, the first flexible structure sub-layer, the second cover plate sub-layer and the second flexible structure sub-layer are sequentially stacked, and the first cover plate sub-layer is used as a contacted layer at the outermost side of the flexible structure layer;
the elastic modulus in the thickness direction of the first flexible structure sub-layer is greater than the elastic modulus in the thickness direction of the second flexible structure sub-layer;
preferably, the elastic modulus of the first flexible structure sub-layer in the extending direction perpendicular to the thickness direction is greater than the elastic modulus of the second flexible structure sub-layer in the extending direction perpendicular to the thickness direction.
5. The flexible cover sheet of claim 4 wherein the thickness of the second flexible structural sublayer is greater than the thickness of the first flexible structural sublayer.
6. A flexible cover sheet according to claim 3, wherein the flexible cover sheet comprises a inflection region and a non-inflection region along its extension direction;
the mesh density of the structural body of the flexible structural layer in the bending region is smaller than that of the structural body of the flexible structural layer in the non-bending region.
7. The flexible cover sheet of claim 4 wherein the modulus of elasticity of the structural body of the first flexible structural sub-layer is greater than the modulus of elasticity of the structural body of the second flexible structural sub-layer.
8. A flexible display panel, comprising: a display layer, the light exit side of which is provided with a flexible cover sheet according to any one of claims 1-7.
9. The flexible display panel of claim 8, further comprising a flexible substrate disposed on a backlight side of the display layer, the flexible substrate comprising a non-metallic support layer disposed on a side of the flexible substrate remote from the display layer, the non-metallic support layer comprising a material comprising one or more of a nylon material, a carbon fiber composite material, or a fabric material.
10. A flexible display device comprising a flexible display panel according to any one of claims 8-9.
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