CN115050263A - Flexible cover plate, display panel and display device - Google Patents
Flexible cover plate, display panel and display device Download PDFInfo
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- CN115050263A CN115050263A CN202210677581.7A CN202210677581A CN115050263A CN 115050263 A CN115050263 A CN 115050263A CN 202210677581 A CN202210677581 A CN 202210677581A CN 115050263 A CN115050263 A CN 115050263A
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- G—PHYSICS
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- 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
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Abstract
The application provides a flexible apron, display panel and display device, this flexible apron includes: the cover plate layer and the flexible structure layer are arranged in a stacked mode; the flexible structure layer has a first elastic modulus along the thickness direction and a second elastic modulus along the extension direction perpendicular to the thickness direction; the first elastic modulus is greater than the second elastic modulus. So, when using this flexible apron to flexible display panel on, on the extension direction of flexible structural layer perpendicular to thickness direction, low elastic modulus can guarantee flexible display panel's bending folding performance, and simultaneously on flexible structural layer thickness direction, high elastic modulus can improve flexible display panel's hardness, promotes flexible display panel's resistant scraping and the performance of falling a pen.
Description
Technical Field
The invention 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 technologies, flexible display technologies are becoming mature, and flexible display devices are widely used in various fields because they can be bent or folded to meet various display requirements.
In the prior art, components inside the flexible display panel are connected through Optically Clear Adhesive (OCA), and meanwhile, stress of the flexible display panel during bending or folding is released, so that bending performance is guaranteed.
Disclosure of Invention
The invention provides a flexible cover plate, a display panel and a display device, and aims to solve the problems that in the prior art, the flexible display panel and the flexible display device are low in hardness and poor in scratch resistance and pen dropping performance.
The invention provides a flexible cover plate which comprises a cover plate layer and a flexible structure layer which are arranged in a stacked mode;
the flexible structure layer has a first elastic modulus along the thickness direction and a second elastic modulus along the extension direction 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 net structure, and the filler is dispersedly filled in the meshes of the structural body.
The flexible cover plate as described above, optionally, the cover plate layer comprising a first cover plate sublayer and a second cover plate sublayer, the flexible structure layer comprising a first flexible structure sublayer and a second flexible structure sublayer;
the first cover plate sublayer, the first flexible structure sublayer, the second cover plate sublayer and the second flexible structure sublayer are sequentially arranged in a laminated mode, and the first cover plate sublayer serves as a contacted layer on the outermost side of the flexible structure layer;
a modulus of elasticity in a thickness direction of the first flexible structural sub-layer is greater than a modulus of elasticity in a thickness direction of the second flexible structural sub-layer;
as described above, optionally, 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.
As described above, optionally, the thickness of the second flexible structure sublayer is greater than the thickness of the first flexible structure sublayer.
The flexible cover plate as described above, optionally, the flexible cover plate comprises a bending region and a non-bending region along its extension direction;
the mesh density of the structure main body of the flexible structure layer in the bending area is smaller than that of the structure main body of the flexible structure layer in the non-bending area.
As described above, optionally, the structural body of the first flexible structural sub-layer has a modulus of elasticity greater than the modulus of elasticity of the structural body of the second flexible structural sub-layer.
The present invention also provides a flexible display panel, comprising: the display layer, the light-emitting side of display layer is provided with as above-mentioned arbitrary flexible apron.
The flexible display panel as described above, optionally, further includes a flexible substrate disposed on the backlight side of the display layer, where the flexible substrate includes a non-metal support layer stacked on the flexible substrate on a side 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 invention also provides a flexible display device comprising any one of the flexible display panels.
The invention provides a flexible cover plate, a display panel and a display device, wherein the flexible cover plate comprises: the flexible structure comprises a cover plate layer and a flexible structure layer which are arranged in a stacked mode; the flexible structure layer has a first elastic modulus along the thickness direction and a second elastic modulus along the extension direction perpendicular to the thickness direction; the first elastic modulus is greater than the second elastic modulus. So, when using this flexible apron to flexible display panel on, on the extension direction of flexible structural layer perpendicular to thickness direction, low elastic modulus can guarantee flexible display panel's bending folding performance, and simultaneously on flexible structural layer thickness direction, high elastic modulus can improve flexible display panel's hardness, promotes flexible display panel's resistant scraping and the performance of falling a pen.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention. Moreover, the drawings and the description are not intended to limit the scope of the inventive concept in any way, but rather to illustrate it by those skilled in the art with reference to specific embodiments.
FIG. 1 is a schematic structural diagram of one embodiment of a flexible cover sheet in an embodiment of the present invention;
FIG. 2 is a schematic perspective view of one embodiment of a flexible cover according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram illustrating one embodiment of a flexible structural layer in a flexible cover according to an embodiment of the present invention;
FIG. 4 is a schematic structural diagram illustrating one embodiment of a structural body of a flexible structural layer in a flexible cover according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram illustrating an embodiment of filler added to a structural body of a flexible structural layer of a flexible cover plate according to the present invention;
FIG. 6 is a schematic structural diagram of another embodiment of a flexible cover sheet in an example of the invention;
FIG. 7 is a schematic structural diagram illustrating a cover plate in a bent state according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of one embodiment of a flexible display panel in an embodiment of the present application;
fig. 9 is a schematic structural diagram of another implementation of a flexible display panel in an embodiment of the present application.
Description of reference numerals:
100-a 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 sub-layer;
122-a second flexible structural sub-layer;
120 a-structural body;
120 b-a filler;
200-a display layer;
300-a flexible substrate;
310-a non-metallic support layer;
320-support buffer layer;
400-polarizing layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
The flexible cover plate is the cover plate capable of being bent, the flexible cover plate can be bent to serve as a basic function, the flexibility of internal devices of the flexible cover plate is required, meanwhile, the flexibility of a structure used for connecting the internal devices of the flexible cover plate or connecting the flexible cover plate with other components is also required, in the field, OCA glue is generally adopted to connect components in the flexible cover plate and connect the flexible cover plate with other panel components, in the bending process of the flexible cover plate, the OCA glue is low in elastic modulus (generally at 30-50 KPa), large deformation can occur in the extending direction, stress is released, and the flexible cover plate is guaranteed to have good bending performance. However, as the OCA is isotropic, when the elastic modulus in the extension direction is low, the elastic modulus in each direction is low, so that the flexible cover plate has the problems of low hardness and poor scratch resistance and pen drop resistance.
In view of the above problems, an embodiment of the present application provides 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-dropping performance.
Exemplary Flexible cover sheet
Fig. 1 is a schematic structural diagram of an embodiment of a flexible cover plate in an embodiment of the present invention, and fig. 2 is a schematic perspective structural diagram of an embodiment of a flexible cover plate in an embodiment of the present invention, as shown in fig. 1 and fig. 2, this embodiment provides a flexible cover plate 100, which includes a cover plate layer 110 and a flexible structural layer 120, which are stacked; the flexible structure layer 120 has a first elastic modulus along a thickness direction thereof and a second elastic modulus along an extension direction perpendicular to the thickness direction thereof, 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 the direction perpendicular to the plane of the flexible structure layer 120, and the second elastic modulus is an elastic modulus in the plane direction of the flexible structure layer 120. For example, when the flexible structure layer 120 is horizontally disposed, the first elastic modulus is an elastic modulus in a vertical direction, and the second elastic modulus is an elastic modulus in a horizontal direction. That is, in the flexible cover plate 100 provided in this embodiment of the application, when the flexible structure layer 120 is horizontally disposed, 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, to achieve bending, it is required that the cover board layer 110 has flexibility and bending capability, and it is required that the flexible structure layer 120 for connecting the cover board layer 110 is 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 the isotropy of the flexible structure layer, when the elastic modulus in the extending direction perpendicular to the thickness direction is low, the elastic modulus in each direction is low, which results in low pencil hardness of the flexible cover plate and poor scratch resistance and pen drop resistance.
In the solution provided in the embodiment of the present application, the cover plate layer 110 may be made of a polyimide film (CPI/HC), a polyethylene terephthalate (PET)/HC film, or an ultra-thin glass UTG material coated with a hard particle coating, so as to ensure the flexibility of the cover plate layer 110.
For the flexible structure layer 120 disposed on the cover plate layer 110, since the flexibility of the flexible cover plate 100 needs to be ensured and the bending capability needs to be ensured, the elastic modulus of the flexible structure layer 120 in the extending direction perpendicular to the thickness direction needs to be lower, but the elastic modulus of the flexible structure layer 120 in the thickness direction can be increased, so as to fill up the pencil hardness of the flexible cover plate 100 and improve the scratch resistance and pen dropping resistance of the flexible cover plate 100.
In some embodiments, a filler with a high elastic modulus may be added to the structural body of the flexible structural layer 120, and in other embodiments, a material that itself has a modulus of elasticity in the thickness direction that is greater than the modulus of elasticity in the direction of elongation perpendicular to the thickness direction may be used. In other embodiments, the flexible structure layer 120 may have a greater modulus of elasticity in the thickness direction than in the direction of elongation perpendicular to the thickness direction, through various composite materials or composite structures.
In the flexible cover plate provided in 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 it can be ensured that the flexible cover plate 100 can be easily deformed in the extending direction N perpendicular to the thickness direction of the flexible structure layer 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 a high elastic modulus in the thickness direction, and the hardness of the flexible cover plate 100 can be improved, so that the scratch resistance and the pen falling resistance of the flexible cover plate are improved.
Fig. 3 is a structural schematic diagram of an embodiment of a flexible structure layer in a flexible cover plate according to an embodiment of the present invention, and as shown in fig. 3, the flexible structure layer 120 may include a structure body 120a and fillers 120b dispersedly filled in the structure body 120 a. The structure body 120a may be an isotropic colloid, such that the filler 120b is directly filled on the structure body 120 a. The structure body 120a may have a gap therein, and the filler 120b may be filled in the gap. 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 is greater than that of the flexible structural layer 120 in the extension direction perpendicular to the thickness direction.
In some embodiments, an optical adhesive material may be used as the material of the structural body 120a, wherein the optical adhesive material includes an acrylic compound, a polyurethane compound, a silica gel substance, and the like, and the filler 120b includes a high elastic modulus substance, and the high elastic modulus substance includes a dense group or a nano-scale particulate substance having a relatively high hardness. The flexible structure layer 120 having a larger elastic modulus in the thickness direction than in the extension direction perpendicular to the thickness direction can be obtained by filling the structure 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 120 b.
In some embodiments, the structural body 120a may also be a material with a gap inside that is prepared by design. The fillers 120b can be filled in the gaps of the structural body 120a, so that the structural body 120a can be easily combined with the filler, and the number and density of the fillers 120b on the structural body 120a can be further controlled by adjusting the size and density of the gaps of the structural body 120a, so as to more easily 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 a chemical or physical manner, such as by heating or stirring in a specific state or in a specific solution, so that the filler 120b is dispersedly filled on the structural body 120a, and the specific manner of filling is not specifically limited in this application.
In addition, since the fillers 120b are dispersedly 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, number, and elastic modulus of the fillers 120 b. The elastic modulus in the extending direction perpendicular to the thickness direction still depends on the material structure itself of the structural body 120a, so that when the flexible cover plate 100 is bent, the structural body 120a can still be deformed in a better stretching manner, and the elastic modulus of the flexible structural layer 120 in the thickness direction can be controlled more flexibly on the basis that the flexible structural layer 120 maintains flexibility in the extending direction perpendicular to the thickness direction.
Fig. 4 is a schematic structural view illustrating an embodiment of a structural body of a flexible structure layer in a flexible cover plate according to an embodiment of the present invention, and fig. 5 is a schematic structural view illustrating an embodiment of a filler added to the structural body of the flexible structure layer in the flexible cover plate according to an embodiment of the present invention, as shown in fig. 4 and fig. 5, based on the above embodiments, the structural body 120a in the flexible structure layer 120 provided in the embodiment of the present invention may also be a mesh structure.
Specifically, the flexible structure layer 120 may be formed of the above materials, including acrylic acid, urethane compounds, or silica gel substances, and may be formed into a net structure by reacting them through a thermal curing reaction or a UV curing reaction by introducing a photoinitiator, so that organic branched chains are changed, thereby forming the above materials into a net structure. The filler 120b may employ small dense radicals or relatively hard nanoscale particulate matter such as metal oxides of Si, Al, and Ga. The structural body 120a of the network structure and the filler 120b are mixed to perform a chemical reaction, or groups or nano-scale particulate matter are filled into the meshes of the network structure body by heating or stirring in a specific solution, and the specific filling manner is not limited in the present application.
Through the above manner, the elastic modulus of the flexible structure layer 120 in the thickness direction is higher than that of the flexible structure layer 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 dropping resistance are improved. Moreover, since the structural body 120a is a net structure, the filler 120b can be more easily filled into the meshes of the structural body 120a, so that the filling is more uniform, and the flatness of the flexible structural layer 120 can be maintained. In addition, because the network structure is in the direction of its extension perpendicular to thickness direction, the mobility is more moderate than OCA, and flexible structure layer 120 can reduce the mobility to an appropriate degree when guaranteeing the bending performance, avoids taking place the deformation because of heating or extrusion scraping etc. further improves resistant scraping performance.
Further, in the solution provided in the embodiment of the present application, both the cover board layer 110 and the flexible structure layer 120 may be one layer or multiple layers, and the number of the layers may be the same or different, and may be flexibly changed according to the actual application requirements. Fig. 6 is a schematic structural diagram of another embodiment of a flexible cover plate according to an embodiment of the present invention, as shown in fig. 6, in which the cover plate layer 110 includes a first cover plate sublayer 111 and a second cover plate sublayer 112, and the flexible structure layer 120 includes a first flexible structure sublayer 121 and a second flexible structure sublayer 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 serves as a contacted layer at the outermost side of the flexible structure layer. The elastic modulus of the first flexible structure sublayer 122 in the thickness direction is greater than the elastic modulus of the second flexible structure sublayer 121 in the thickness direction.
In the flexible cover 100 provided in the embodiment of the application, the cover layer 110 includes a first cover sublayer 111 and a second cover sublayer 112, a first flexible structure sublayer 121 is disposed between the first cover sublayer 111 and the second cover sublayer 112, and a second flexible structure sublayer 122 is disposed below the second cover sublayer 112. The first flexible structure sublayer 121 is used to connect the first cover sublayer 111 and the second cover sublayer 112, or other components between the two cover sublayers, the second flexible structure sublayer 122 is used to connect the flexible cover 100 with other components constituting the flexible display panel, and the first cover sublayer serves as the outermost contacted layer of the flexible structure layer.
Specifically, the materials of the first cover plate sublayer 111 and the second cover plate sublayer 112 may be the same or different. The first cover sheet sublayer 111 can be made of a CPT/HC film or a PET/HC film, the second cover sheet sublayer 112 can also be made of a CPT/HC film or a PET/HC film, and ultrathin glass UTG.
It should be noted that, the first flexible structure sublayer 121 and the second flexible structure sublayer 122 both have the characteristics of the flexible structure layers in the above embodiments, and the elastic modulus in the thickness direction of the first flexible structure sublayer is greater than the elastic modulus in the extension direction perpendicular to the thickness direction of the first flexible structure sublayer by adding the high elastic modulus filler to the main body of the mesh structure, so that the bending performance is ensured, and the hardness is improved, and the scratch resistance and the pen falling performance are improved. Through setting up multilayer apron layer and flexible structural layer, can satisfy various different demonstration demands.
In other embodiments of the present invention, the elastic modulus of the first flexible structure sub-layer 121 in the thickness direction 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 structure sublayer 121 on the upper layer is used as the outermost layer of adhesive member, and has a larger influence on the hardness, pen drop and scratch resistance of the flexible cover plate, while the second flexible structure sublayer 122 on the lower layer is subjected to a smaller scratch force than the first flexible structure sublayer 121, and has a smaller influence on the pen drop performance and the scratch resistance, but the second flexible structure sublayer 122 on the lower layer is located at a position further inside the panel when the panel is formed, so that the influence on releasing stress, reducing the 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 upper first flexible structure sublayer 121 in the thickness direction thereof may be made larger, so as to better improve the scratch resistance of the flexible cover plate; on the contrary, because of the lower layer, the scratch resistance is less affected, and in order to ensure good bending performance and improve stress releasing capability, the elastic modulus in the thickness direction of the second flexible structure sublayer 122 may be set to be smaller than the elastic modulus in the thickness direction of the first flexible structure sublayer 121 on the basis of the above embodiments. Through making the elastic modulus of the first flexible structure sublayer 121 thickness direction be greater than the elastic modulus of the second flexible structure sublayer 122 thickness direction, can realize making flexible apron improve the hardness, when promoting the performance of falling a pen and scraping resistant performance, still improve the ability of releasing stress between the membrane layer, make inner structure receive littleer.
Further, based on the same reason and theory, the elastic modulus of the first flexible structure sublayer 121 in the extending direction perpendicular to the thickness direction may be larger than the elastic modulus of the second flexible structure 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-fall performance and the scratch resistance of the flexible cover plate, and ensure the capability of releasing the stress between the film layers.
Specifically, in some embodiments of the present invention, the elastic modulus of the first flexible structure sub-layer 121 in the extending direction perpendicular to the thickness direction may be 30KPa to 50KPa, the elastic modulus of the thickness direction may be 200 KPa to 300KPa, the elastic modulus of the second flexible structure sub-layer 122 in the extending direction perpendicular to the thickness direction may be 10 KPa to 30KPa, and the elastic modulus of the thickness direction may be 50KPa to 150 KPa.
In order to achieve the above purpose, in some specific implementations, more fillers or fillers with higher elastic modulus may be added on the second flexible structure sublayer 122, and the first flexible structure sublayer 121 may use a material with a high elastic modulus as the structure body, and the second flexible structure sublayer 122 uses a material with a low elastic modulus as the structure body.
In the embodiment of the present application, according to different requirements, the first flexible structure sub-layer 121 disposed on the upper layer is designed to have a higher elastic modulus in the thickness direction and the extending direction perpendicular to the thickness direction than the second flexible structure sub-layer 122. Compared with two identical flexible structure layers, the characteristics of the two flexible structure layers are adjusted according to different requirements, so that the flexible cover plate has different functional emphasis points, the hardness of the flexible cover plate is higher, the pen falling performance and the scratch resistance are better, and the performance of releasing the stress between the film layers is also better.
Further, on the basis of the above embodiments, in the flexible cover plate provided in the embodiments of the present application, the thickness of the second flexible structure sublayer 122 may also be greater than the thickness of the first flexible structure sublayer 122.
As mentioned in the above embodiments, since the second flexible structure sublayer 122 below has a greater influence on releasing the internal stress of the flexible cover, and the first flexible structure sublayer 121 has a greater influence on the scratch resistance and the pen-out resistance, and the thickness of the flexible structure layer is increased, the ability of the flexible structure layer to release the stress can be significantly increased, in other embodiments of the present application, the thickness of the second flexible structure sublayer 122 can be made larger than the thickness of the first flexible structure sublayer 121, so that on the basis of affecting the smaller thickness of the flexible cover 100, the performance of releasing the stress inside the flexible cover is further improved efficiently, and the bending performance of the flexible cover is 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 range, such as 50-100 um.
Fig. 7 is a schematic structural view illustrating a cover plate in a bent state according to an embodiment of the present invention, as shown in fig. 7, in other embodiments of the present invention, in order to better improve the use experience of the flexible cover plate, a bent region and a non-bent region of the flexible cover plate along an extension 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 bent region is less than a mesh density of a structural body of a flexible structural layer in the non-bent region.
Specifically, in the embodiment of the present application, the flexible structure layer of the bending region b may adopt a structure main body with a smaller mesh density, so as to reduce the density of fillers in the mesh, make the bending region b easier to bend, and reduce the bending force of a user; the flexible structure layer of non-bending area a can adopt the bigger structure main part of mesh density, increases the density of filler, makes the modulus of non-bending area a bigger to make the hardness of non-bending area b vertical direction higher, promote the resistant scraping and the pen falling performance of flexible apron.
Exemplary Flexible display Panel
Fig. 8 is a schematic structural diagram of an implementation manner 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 100 in the above embodiment is disposed on the light exit side of the display layer 200. The flexible cover 100 is the flexible cover in the above embodiment, and includes a cover layer 110 and a flexible structure layer 120. The structure, function and implementation of the flexible cover plate may be the same as those of the above embodiments, and are not described herein again. By making the elastic modulus of the flexible structure layer 120 in the flexible cover plate 100 in the thickness direction greater than the elastic modulus in the extension direction perpendicular to the thickness direction, the flexible display panel ensures good bending performance in the extension direction perpendicular to the thickness direction, and has higher hardness in the thickness direction, thereby improving the scratch resistance and pen dropping 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, and the flexible substrate 300 includes a non-metal support layer 310 stacked on the flexible substrate on the side away from the display layer 200, where the material of the non-metal support layer 310 includes one or more of a nylon material, a carbon fiber composite material, a fabric material, and an aramid fiber, where the carbon fiber composite material may be a carbon nanofiber or a carbon nanotube, and the modulus and the hardness are similar to those of the metallic stainless steel material. Through the non-metal supporting layer 310 with the modulus and hardness similar to those of metal stainless steel, the flexibility and fatigue resistance of the flexible display panel are better, and the crease of the flexible display panel can be greatly reduced.
Fig. 9 is a schematic structural diagram of another embodiment of a flexible display panel in an embodiment of the present application, and as shown in fig. 9, the flexible display panel includes the flexible cover plate described above, including a first cover plate sublayer 111, a first flexible structure sublayer 121, a second cover plate sublayer 112, a second flexible structure sublayer 122, a display layer 200, and a flexible substrate 300. Wherein, the first cover 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 above embodiments.
In other embodiments, the support buffer layer 320 may be further disposed on the non-metal support layer 310, and the support buffer layer 320 may include a support film (BPF) and a buffer material, such as foam, for buffering a force in the flexible cover plate, so as to improve user experience and increase 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 100, and the polarizing layer 400 includes a polarizer to improve the display effect.
It should be noted that, in practical application, the layer body may be increased or decreased according to practical requirements or technical development, which is not described herein.
In the flexible display panel provided in this embodiment, the two flexible structure layers are filled with the high-modulus filler into the main body of the mesh structure, so that the elastic modulus in the thickness direction of each flexible structure layer is greater than the elastic modulus in the extension direction perpendicular to the thickness direction, and the bending performance is not reduced, and the hardness is increased, and the scratch resistance and the pen dropping performance are improved. Meanwhile, the elastic modulus in the thickness direction of the first flexible structure sublayer 121 on the upper layer is greater than the elastic modulus in the thickness direction of the second flexible structure sublayer 122 on the lower layer, the elastic modulus in the extension direction of the first flexible structure sublayer 121 perpendicular to the thickness direction is greater than the elastic modulus in the extension direction of the second flexible structure sublayer 122 perpendicular to the thickness direction, and the thickness of the second flexible structure sublayer 122 on the lower layer is increased, so that the flexible display panel has higher hardness, better pen drop performance and scratch resistance, better internal stress release and better internal stress reduction effect. Furthermore, by arranging the non-metal support layer 310, the folding mark of the flexible display panel can be effectively reduced in the using process. And by arranging the supporting buffer layer 320, the force in the flexible display panel is buffered, and the service life of the flexible display panel is prolonged.
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 the aspect of surface hardness, the flexible display panel provided by the embodiment of the application reaches the H level, which is far superior to 10B of the traditional display panel; moreover, in 10 ten thousand bending experiments, the crease of the flexible display panel provided by the embodiment of the application is obviously slight.
Exemplary Flexible display device
The embodiment provides a flexible display device, which can be any product or component with a display function, such as an OLED display device, 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 are not described herein again.
In the flexible display device provided in this embodiment, the flexible structure layer fills the high-modulus filler into the main body of the mesh structure, so that the elastic modulus in the thickness direction of the flexible structure layer is greater than the elastic modulus in the extension direction perpendicular to the thickness direction, thereby increasing the hardness and improving the scratch resistance and pen-out performance without reducing the bending performance. Meanwhile, the elastic modulus in the thickness direction of the flexible structure sublayer on the upper layer is larger than that in the thickness direction of the flexible structure sublayer on the lower layer, the elastic modulus in the extension direction of the flexible structure sublayer on the upper layer, which is perpendicular to the thickness direction, is larger than that in the extension direction of the flexible structure sublayer on the lower layer, the thickness of the flexible structure sublayer on the lower layer is improved, the hardness of the flexible display device is higher, the pen falling performance and the scratch resistance performance are better, the internal stress is released, and the internal stress is reduced. Furthermore, through setting up nonmetal supporting layer, can effectively alleviate the use in-process, flexible display device's crease. And through setting up the support buffer layer, cushion the power in the flexible display device, improve the life of flexible display device.
In addition, in the present invention, unless otherwise explicitly specified or limited, the terms "connected," "stacked," and the like are to be construed broadly, e.g., as being fixedly connected, detachably connected, or integrated; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
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 mode;
the flexible structure layer has a first elastic modulus along the thickness direction and a second elastic modulus along the extension direction perpendicular to the thickness direction;
the first elastic modulus is greater than the second elastic modulus.
2. The flexible cover sheet of claim 1, wherein the flexible structure layer comprises a structural body and a filler dispersed in 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 mesh holes of the structural body.
4. The flexible cover sheet of claim 2,
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 sublayer, the first flexible structure sublayer, the second cover plate sublayer and the second flexible structure sublayer are sequentially arranged in a laminated mode, and the first cover plate sublayer serves as a contacted layer on the outermost side of the flexible structure layer;
the modulus of elasticity in the thickness direction of the first flexible structure sublayer is greater than the modulus of elasticity in the thickness direction of the second flexible structure sublayer;
preferably, an elastic modulus of the first flexible structure sub-layer in an extension direction perpendicular to the thickness direction is greater than an elastic modulus of the second flexible structure sub-layer in an extension direction perpendicular to the thickness direction.
5. The flexible cover sheet of claim 4, wherein a thickness of the second flexible structural sublayer is greater than a thickness of the first flexible structural sublayer.
6. The flexible cover sheet of claim 3, wherein the flexible cover sheet comprises a bending region and a non-bending region along its extension direction;
the mesh density of the structure main body of the flexible structure layer in the bending area is smaller than that of the structure main body of the flexible structure layer in the non-bending area.
7. The flexible cover sheet of claim 4, wherein the structural body of the first flexible structural sublayer has a modulus of elasticity greater than the modulus of elasticity of the structural body of the second flexible structural sublayer.
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 the backlight side of the display layer, the flexible substrate comprising a non-metallic support layer disposed on the flexible substrate on a side away from the display layer, the non-metallic support layer comprising one or more of a nylon material, a carbon fiber composite material, or a fabric material.
10. A flexible display device comprising the flexible display panel according to any one of claims 8 to 9.
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| CN115050263B (en) | 2023-10-27 |
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