CN114267257A - Flexible display screen - Google Patents
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- CN114267257A CN114267257A CN202111664090.0A CN202111664090A CN114267257A CN 114267257 A CN114267257 A CN 114267257A CN 202111664090 A CN202111664090 A CN 202111664090A CN 114267257 A CN114267257 A CN 114267257A
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Abstract
The application relates to the technical field of display equipment, in particular to a flexible display screen, which comprises a flexible substrate, and a bonding layer and a flexible cover plate which are sequentially stacked on the flexible substrate; the bonding layer comprises a first material area and a second material area, and the first material area and the second material area are alternately connected along the length direction of the bonding layer; the first material region is comprised of a first material and the second material region is comprised of a second material, the first material having a modulus of elasticity greater than the modulus of elasticity of the second material. The first material area consisting of the first material and the second material area consisting of the second material are designed in the bonding layer of the flexible display screen, and the elastic modulus of the first material is larger than that of the second material, so that the extrusion stress generated by curling to the flexible display screen along the direction perpendicular to the film layer can be relieved, and the delamination phenomenon between the film layers of the flexible display screen can be effectively prevented.
Description
Technical Field
The application relates to the technical field of display equipment, in particular to a flexible display screen.
Background
The flexible display screen is a flexible display device made of soft materials and capable of being deformed and bent. The flexible display screen generally includes a multi-layer structure, and after the flexible display screen is unfolded and curled for a plurality of times, due to different deformation amounts of each layer, the layers are easily separated from each other, which may affect the display performance of the flexible display screen and the experience of a user.
Disclosure of Invention
The application provides a flexible display screen to solve current flexible display screen and expand and curl many times the back, because each layer deflection is different, take place the problem of separation easily between layer and layer.
According to a first aspect of the present application, the present application provides a flexible display screen, which includes a flexible substrate, and a bonding layer and a flexible cover plate sequentially stacked on the flexible substrate;
the adhesive layer comprises first material regions and second material regions, and the first material regions and the second material regions are alternately connected along the length direction of the adhesive layer; the first material region is comprised of a first material and the second material region is comprised of a second material, the first material having a modulus of elasticity greater than the modulus of elasticity of the second material.
In one possible design, the ratio of the elastic modulus of the first material to the elastic modulus of the second material is (2-4): 1.
In one possible design, the ratio of the modulus of elasticity of the first material and the second material is 3: 1.
In one possible design, the flexible display screen has a first end and a second end; the flexible display screen has a stress concentration region when being curled, and the stress concentration region is positioned between the first end and the second end; the first material region is arranged at the stress concentration region.
In one possible design, from the stress concentration region toward the first end, the bonding layer includes a plurality of segments of the first material region, and the distribution density of the first material in each segment of the first material region is sequentially from dense to sparse.
In one possible design, from the stress concentration area to the first end, the bonding layer comprises six sections of the first material area, and the distribution density ratio of the first material in the six sections of the first material area is 10:8:6:4:2:1 in sequence.
In one possible design, from the stress concentration area to the second end, the adhesive layer includes a plurality of segments of the first material region, and the distribution density of the first material in each segment of the first material region is sequentially from dense to sparse.
In one possible design, from the stress concentration area to the second end, the bonding layer comprises six sections of the first material area, and the distribution density ratio of the first material in the six sections of the first material area is 10:8:6:4:2:1 in sequence.
In one possible design, the thickness of the bonding layer is 20-30 μm.
In one possible design, the first material and the second material are each independently selected from an acrylic-based material, an epoxy-based material, or a silicone-based material.
The beneficial effect of this application:
the flexible display screen comprises a flexible substrate, and a bonding layer and a flexible cover plate which are sequentially stacked on the flexible substrate; the bonding layer comprises a first material area and a second material area, and the first material area and the second material area are alternately connected along the length direction of the bonding layer; the first material region is comprised of a first material and the second material region is comprised of a second material, the first material having a modulus of elasticity greater than the modulus of elasticity of the second material. Through designing the first material district that comprises first material and the second material district that comprises the second material in the tie coat of flexible display screen to make the elastic modulus of first material be greater than the elastic modulus of second material, on the one hand, first material and second material all have certain adhesive property and elasticity, can realize the inseparable bonding between flexible base plate and the flexible apron, guarantee simultaneously that the tie coat can adapt to the curling performance of flexible display screen. On the other hand, the first material and the second material have different elastic moduli, and the design can relieve the extrusion stress generated by the curling to the flexible display screen along the direction vertical to the film layer, so that the delamination phenomenon between the film layers of the flexible display screen can be effectively prevented.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
FIG. 1 is a schematic structural diagram of a flexible display screen provided by the present application in a first embodiment;
fig. 2 is a schematic structural diagram of a flexible display screen provided by the present application in a second specific embodiment.
Reference numerals:
1-a flexible substrate;
2-a tie layer;
21-a first material region;
22-a second material region;
3-a flexible cover plate;
4-a first end;
5-a second end;
6-stress concentration zone.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. 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 application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
The flexible display screen is a flexible display device made of soft materials and capable of being deformed and bent. The flexible display screen is the crimp state when accomodating, is the expansion state when using, compares and has apparent advantage in traditional display device, like volume reduction, portable, application scene extensively etc..
The flexible display screen generally comprises a multi-film-layer structure, the lengths of all films of the flexible display screen are the same when the flexible display screen is in an unfolded state, when the flexible display screen is curled, all films can be extruded or stretched to deform, and the flexible display screen can form extrusion stress along the direction perpendicular to the films due to the fact that the curled radiuses of all the films are different and corresponding deformation amounts are different. After the flexible display screen is unfolded and curled for many times, the bonding force between the film layers is not enough to resist the formed stress, and the flexible display screen is easy to delaminate, particularly, delamination is easy to occur at the place where the stress of the flexible display screen is concentrated, so that the display performance of the flexible display screen and the experience of a user are influenced.
The applicant researches and finds that a material with relatively high elastic modulus can be designed in one layer of the multi-layer structure of the flexible display screen to relieve extrusion stress generated by the curling on the flexible display screen along the direction vertical to the film layer, so that the phenomenon of layering between the film layers is prevented.
Based on the above consideration, in order to solve the problem that the conventional flexible display screen is prone to film separation after being unfolded and curled for multiple times, through intensive research, the applicant designs a flexible display screen, wherein the flexible display screen comprises a flexible substrate, and an adhesive layer and a flexible cover plate which are sequentially stacked on the flexible substrate. The adhesive layer comprises first material regions and second material regions, the first material regions being alternately connected to the second material regions along the length of the adhesive layer. The first material region is comprised of a first material and the second material region is comprised of a second material, the first material having a modulus of elasticity greater than the modulus of elasticity of the second material.
Such flexible display screen designs first material district and second material district in the tie coat of connecting flexible base plate and flexible apron, and first material district comprises first material, and the second material district comprises the second material, and first material and second material all have certain adhesive property and elasticity to realize the inseparable bonding between flexible base plate and the flexible apron, guarantee simultaneously that the tie coat can adapt to the curling performance of flexible display screen. In addition, the first material and the second material have different elastic moduli, and the elastic modulus of the first material is larger than that of the second material, so that the extrusion stress generated by the curling to the flexible display screen along the direction vertical to the film layer can be relieved by the design, and the film layer separation phenomenon of the flexible display screen can be effectively prevented.
The flexible display screen disclosed in the embodiment of the application can be used in products or parts with display functions such as mobile phones, tablet computers, intelligent wearable devices, televisions, displays, notebook computers and digital photo frames, and can be curled and folded when not in use, and the flexible display screen can be stored in a small-size form, is convenient to carry and can be unfolded when in use. Moreover, such a flexible display panel is prone to film separation after being unfolded and rolled many times.
According to some embodiments of the present application, as shown in fig. 1, fig. 1 is a schematic structural diagram of a flexible display screen according to some embodiments of the present application in a partially rolled state. The embodiment of the application provides a flexible display screen, and the flexible display screen comprises a flexible substrate 1, and a bonding layer 2 and a flexible cover plate 3 which are sequentially stacked on the flexible substrate 1. The adhesive layer 2 comprises first material areas 21 and second material areas 22, the first material areas 21 being alternately connected to the second material areas 22 along the length of the adhesive layer 2. The first material section 21 consists of a first material and the second material section 22 consists of a second material, the modulus of elasticity of the first material being greater than the modulus of elasticity of the second material.
The flexible substrate 1, the flexible substrate 1 generally includes a flexible substrate and a display element disposed on the flexible substrate to implement a flexible display function. The flexible substrate is made of a soft material, and for example, the flexible substrate may be a film including one selected from polyester-based polymers, silicone-based polymers, acrylic polymers, polyolefin-based polymers, and copolymers thereof. The flexible substrate may be a single layer structure or a multilayer structure.
The flexible cover plate 3 protects the flexible substrate 1, and the flexible cover plate 3 is generally made of glass or transparent resin material with certain elasticity.
The bonding layer 2 plays a role in connecting the flexible substrate 1 and the flexible cover plate 3, is colorless and transparent, has light transmittance of over 95 percent, has good bonding strength, can be cured at room temperature or intermediate temperature, and has the characteristics of small curing shrinkage and the like.
The preparation modes of the first material area 21 and the second material area 22 on the flexible substrate 1 include a coating and developing mode, a mask plate coating mode or a printing mode. The coating and developing method can be specifically as follows: the method comprises the steps of firstly preparing a second material, coating the second material on a flexible substrate 1, removing the second material at a position where the first material is preset through exposure and development, then coating the first material on the whole surface, and removing the first material at a non-preset position through exposure and development. The mask plate coating mode is to coat a first material and a second material respectively in two mask plate procedures. The printing mode specifically includes that the glue containing the first material and the glue containing the second material are respectively injected into a printing device, and 3D printing is performed on the flexible substrate 1 according to a set printing path.
Through designing the first material district that comprises first material and the second material district that comprises the second material in the tie coat of flexible display screen to make the elastic modulus of first material be greater than the elastic modulus of second material, on the one hand, first material and second material all have certain adhesive property and elasticity, can realize the inseparable bonding between flexible base plate and the flexible apron, guarantee simultaneously that the tie coat can adapt to the curling performance of flexible display screen. On the other hand, the first material and the second material have different elastic moduli, and the design can relieve the extrusion stress generated by the curling to the flexible display screen along the direction vertical to the film layer, so that the delamination phenomenon between the film layers of the flexible display screen can be effectively prevented.
According to some embodiments of the present application, the ratio of the elastic modulus of the first material to the elastic modulus of the second material is (2-4): 1.
Alternatively, the ratio of the elastic modulus of the first material to the elastic modulus of the second material may be 2:1, 2.2:1, 2.5:1, 2.8:1, 3:1, 3.2:1, 3.5:1, 3.8:1, or 4:1, etc., or may be other values within the above range, and is not limited herein. According to some embodiments of the present application, the first material and the second material have a modulus of elasticity ratio of 3: 1.
Through the reasonable selection of the elastic modulus ratio of the first material and the second material, the extrusion stress generated by the flexible display screen along the direction perpendicular to the film layer due to the curling can be effectively relieved, and therefore the delamination phenomenon between the film layers of the flexible display screen can be effectively prevented.
According to some embodiments of the present application, as shown in fig. 1, a flexible display screen has a first end 4 and a second end 5; the flexible display screen has a stress concentration area 6 when being curled, and the stress concentration area 6 is positioned between the first end 4 and the second end 5; a first material region 21 is provided at the stress concentration region 6.
A first end 4 and a second end 5, the first end 4 may be a curled inner end and the second end 5 may be a curled outer end, i.e. when curled, the first end 4 is curled into a curl towards the second end 5.
The stress concentration area 6 refers to an area where the maximum stress value of the local area of the flexible display screen is higher than the average stress value during the curling process.
By arranging the first material region 21 with higher elastic modulus at the stress concentration region 6, the extrusion stress generated by the curling to the flexible display screen along the direction perpendicular to the film layer can be more effectively relieved, so that the film layer separation phenomenon of the flexible display screen can be more effectively prevented.
According to some embodiments of the present application, as shown in fig. 2, fig. 2 is a schematic structural diagram of a flexible display screen according to some embodiments of the present application in a partially rolled state. From the stress concentration region 6 to the first end 4, the adhesive layer 2 comprises a plurality of sections of first material regions 21, and the distribution density of the first material in each section of first material region 21 is from dense to sparse.
Alternatively, from the stress concentration area 6 to the first end 4, the number of the segments of the adhesive layer 2 including the first material area 21 may be 3 segments, 4 segments, 6 segments, 8 segments, 10 segments, 12 segments, 15 segments, etc., and certainly is not limited to these segments, and may be designed according to actual requirements.
In the process that the flexible display screen is curled from the first end 4 to the stress concentration area 6, the stress is gradually increased, the plurality of sections of first material areas 21 are designed in the bonding layer 2 from the stress concentration area 6 to the first end 4, and the distribution density of the first materials in each section of first material area 21 is sequentially from dense to sparse, so that the stress can be effectively relieved, the stress of the flexible display screen from the first end 4 to the stress concentration area 6 can be relieved in a targeted manner, and the phenomenon of layering between films of the flexible display screen can be effectively prevented.
According to some embodiments of the present application, from the stress concentration area 6 to the first end 4, the adhesive layer 2 comprises six sections of the first material region 21, and the distribution density ratio of the first material in the six sections of the first material region 21 is 10:8:6:4:2:1 in sequence.
By designing six sections of first material areas 21 in the bonding layer 2 from the stress concentration area 6 to the first end 4 and enabling the distribution density ratio of the first materials in each section of first material area 21 to be 10:8:6:4:2:1 in sequence, stress can be relieved more effectively, stress of the flexible display screen from the first end 4 to the stress concentration area 6 can be relieved correspondingly according to the stress, and therefore the phenomenon of layering between films of the flexible display screen can be prevented more effectively.
According to some embodiments of the present application, from the stress concentration area 6 towards the second end 5, the adhesive layer 2 comprises a plurality of sections 21 of the first material, the distribution density of the first material in each section 21 of the first material being in turn from dense to sparse.
Alternatively, from the stress concentration area 6 to the second end 5, the number of the segments of the adhesive layer 2 including the first material area 21 may be 3 segments, 4 segments, 6 segments, 8 segments, 10 segments, 12 segments, 15 segments, etc., and certainly is not limited to these segments, and may be designed according to actual requirements.
In the process that the flexible display screen is curled from the stress concentration area 6 to the second end 5, the stress is gradually reduced, the plurality of sections of first material areas 21 are designed in the bonding layer 2 from the stress concentration area 6 to the second end 5, and the distribution density of the first materials in each section of first material area 21 is sequentially from dense to sparse, so that the stress can be effectively relieved, the stress of the flexible display screen from the stress concentration area 6 to the second end 5 can be relieved in a targeted manner, and the phenomenon of layering between films of the flexible display screen can be effectively prevented.
According to some embodiments of the present application, as shown in fig. 2, from the stress concentration area 6 to the second end 5, the bonding layer 2 comprises six segments of the first material area 21, and the distribution density ratio of the first material in the six segments of the first material area 21 is 10:8:6:4:2:1 in sequence.
In the process that the flexible display screen is curled from the stress concentration area 6 to the second end 5, the stress is gradually reduced, six sections of first material areas 21 are designed in the bonding layer 2 from the stress concentration area 6 to the second end 5, and the distribution density ratio of the first materials in each section of first material area 21 is 10:8:6:4:2:1 in sequence, so that the stress can be relieved more effectively, the stress of the flexible display screen from the stress concentration area 6 to the second end 5 can be relieved in a targeted mode, and the phenomenon of layering between films of the flexible display screen can be prevented more effectively.
According to some embodiments of the present application, the thickness of the adhesive layer 2 is 20 μm to 30 μm.
Alternatively, the thickness of the adhesive layer 2 may be 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, or 30 μm, or the like, and may be other values within the above range, which is not limited herein.
Through the reasonable selection to the thickness of tie coat 2, can make the connection of flexible substrate 1 and flexible apron 3 more firm, guarantee the curling performance of flexible display screen simultaneously. If the thickness of the adhesive layer 2 is less than 20 μm, the connection between the flexible substrate 1 and the flexible cover 3 is not strong enough, resulting in separation between the flexible substrate 1 and the flexible cover 3 during the curling process of the flexible display. If the thickness of the adhesive layer 2 is more than 30 μm, the curling performance of the entire flexible display screen is affected, which is disadvantageous to the curling of the flexible display screen.
In some embodiments of the present application, the first material and the second material are each independently selected from an acrylic-based material, an epoxy-based material, or a silicone-based material.
Alternatively, the acrylic material may be polyethylacrylate, polymethyl acrylate, polymethyl methacrylate, a-cyanoacrylate, or the like, although not limited to these materials. The epoxy resin material may be a one-component type epoxy resin, a two-component type epoxy resin, a multi-component type epoxy resin, or the like, but is not limited thereto. The silicone-based material may be a polysiloxane, but is not limited to this material.
According to some alternative embodiments of the present application, as shown in fig. 1, the present application discloses a flexible display panel including a flexible substrate 1, and an adhesive layer 2 and a flexible cover sheet 3 sequentially stacked on the flexible substrate 1. The adhesive layer 2 comprises first material areas 21 and second material areas 22, the first material areas 21 being alternately connected to the second material areas 22 along the length of the adhesive layer 2. The first material section 21 consists of a first material and the second material section 22 consists of a second material, the modulus of elasticity of the first material being greater than the modulus of elasticity of the second material. The flexible display has a first end 4 and a second end 5. The flexible display screen presents a stress concentration area 6 when rolled, the stress concentration area 6 being located between the first end 4 and the second end 5. A section of the first material region 21 is provided at the stress concentration region 6.
The first material region 21 with a higher elastic modulus is arranged at the stress concentration region 6, so that the extrusion stress generated by the curling on the flexible display screen along the direction perpendicular to the film layer at the stress concentration region 6 can be relieved more effectively, and the film layer separation phenomenon of the flexible display screen can be prevented more effectively.
According to some alternative embodiments of the present application, as shown in fig. 2, the present application discloses a flexible display panel including a flexible substrate 1, and an adhesive layer 2 and a flexible cover sheet 3 sequentially stacked on the flexible substrate 1. The adhesive layer 2 comprises first material areas 21 and second material areas 22, the first material areas 21 being alternately connected to the second material areas 22 along the length of the adhesive layer 2. The first material section 21 consists of a first material and the second material section 22 consists of a second material, the modulus of elasticity of the first material being greater than the modulus of elasticity of the second material. The flexible display has a first end 4 and a second end 5. The flexible display screen presents a stress concentration area 6 when rolled, the stress concentration area 6 being located between the first end 4 and the second end 5. From the stress concentration area 6 to the first end 4, the bonding layer 2 comprises six sections of first material areas 21, and the distribution density ratio of the first materials in the six sections of first material areas 21 is 10:8:6:4:2:1 in sequence. From the stress concentration area 6 to the second end 5, the bonding layer 2 comprises six sections of first material areas 21, and the distribution density ratio of the first materials in the six sections of first material areas 21 is 10:8:6:4:2:1 in sequence.
The flexible display screen of this embodiment is through designing distribution density in 2 respectively by stress concentration region 6 to the tie coat of first end 4 and second end 5 in proper order by dense to sparse first material, can carry out the release of stress more effectively for the stress from stress concentration region 6 to the flexible display screen of first end 4 and second end 5 can both be alleviated to ground, thereby can prevent the interlamellar phenomenon that takes place of flexible display screen more effectively.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. The flexible display screen is characterized by comprising a flexible substrate (1), and a bonding layer (2) and a flexible cover plate (3) which are sequentially stacked on the flexible substrate (1);
the adhesive layer (2) comprises first material regions (21) and second material regions (22), the first material regions (21) being alternately connected with the second material regions (22) along the length direction of the adhesive layer (2); the first material region (21) consists of a first material and the second material region (22) consists of a second material, the modulus of elasticity of the first material being greater than the modulus of elasticity of the second material.
2. The flexible display of claim 1, wherein the ratio of the modulus of elasticity of the first material to the second material is (2-4): 1.
3. The flexible display of claim 2, wherein the ratio of the modulus of elasticity of the first material to the second material is 3: 1.
4. A flexible display screen according to claim 1, characterized in that the flexible display screen has a first end (4) and a second end (5); the flexible display screen presents a stress concentration area (6) when rolled, the stress concentration area (6) being located between the first end (4) and the second end (5); the first material region (21) is disposed at the stress concentration region.
5. A flexible display screen according to claim 4, wherein from the stress concentration area (6) towards the first end (4), the adhesive layer (2) comprises a plurality of sections of the first material region (21), the distribution density of the first material in each section of the first material region (21) being in turn dense to sparse.
6. The flexible display of claim 4, wherein from the stress concentration area (6) towards the first end (4), the adhesive layer (2) comprises six segments of the first material region (21), and the distribution density ratio of the first material in the six segments of the first material region (21) is 10:8:6:4:2:1 in sequence.
7. A flexible display screen according to claim 4, wherein from the stress concentration area (6) towards the second end (5), the adhesive layer (2) comprises a plurality of sections of the first material region (21), the distribution density of the first material in each section of the first material region (21) being in turn dense to sparse.
8. A flexible display screen according to claim 7, characterized in that from the stress concentration area (6) towards the second end (5) the adhesive layer (2) comprises six sections of the first material area (21), the distribution density ratio of the first material in the six sections of the first material area (21) being in the order of 10:8:6:4:2: 1.
9. A flexible display screen according to claim 1, characterized in that the thickness of the adhesive layer (2) is 20-30 μm.
10. The flexible display of claim 1, wherein the first material and the second material are each independently selected from an acrylic-based material, an epoxy-based material, or a silicone-based material.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111664090.0A CN114267257A (en) | 2021-12-31 | 2021-12-31 | Flexible display screen |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111664090.0A CN114267257A (en) | 2021-12-31 | 2021-12-31 | Flexible display screen |
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