CN108831301B - Flexible display screen and flexible display device - Google Patents
Flexible display screen and flexible display device Download PDFInfo
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- CN108831301B CN108831301B CN201810620256.0A CN201810620256A CN108831301B CN 108831301 B CN108831301 B CN 108831301B CN 201810620256 A CN201810620256 A CN 201810620256A CN 108831301 B CN108831301 B CN 108831301B
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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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Abstract
The invention provides a flexible display screen and a flexible display device, and aims to solve the technical problem that the flexible display screen is easy to damage when being bent in the prior art. The structure comprises a first functional layer, a memory material layer, a buffer layer and a second functional layer which are sequentially stacked and arranged in a contact mode, wherein the buffer layer changes along with the shape change of the memory material layer. The elastic deformation stress difference of each adjacent functional layer is offset by the displacement difference of the inner side surface and the outer side surface when the memory material layer is bent, the functional layer on the outer side is prevented from being subjected to overlarge stretching force, the overall resilience stress of the flexible display screen is reduced, and the use defects of falling, folding, cracking, bubbling and the like of a film layer caused by overlarge deformation stress are avoided.
Description
Technical Field
The invention relates to the technical field of display screens, in particular to a flexible display screen and a flexible display device.
Background
The flexible display screen is affected by the physical characteristics of all functional film layers and has a bending defect, and when the display screen is folded, due to the existence and difference of deformation stress among all the layers, the adhesion between the film layers is poor, so that the phenomena of falling/peeling and individual rigid layer fracture exist among the film layers.
Disclosure of Invention
In view of this, embodiments of the present invention provide a flexible display panel and a flexible display device, so as to solve the technical problem that a flexible display panel in the prior art is easily damaged when being bent.
The flexible display screen comprises a first functional layer, a memory material layer, a buffer layer and a second functional layer which are sequentially stacked and arranged in a contact mode, wherein the buffer layer changes along with the shape change of the memory material layer.
In an embodiment of the invention, a size of a side of the buffer layer close to the memory material changes with bending of the display screen.
In an embodiment of the invention, the buffer layer includes a plurality of buffer units uniformly arranged.
In an embodiment of the invention, the buffer units have large ends and small ends, the small ends are arranged towards the memory material layer, and preferably, the gap between the small ends of the buffer units is 5% to 40% of the height of the buffer units.
In an embodiment of the present invention, end surfaces of the large ends of the buffer units are disposed on the same plane, and end surfaces of the small ends of the buffer units are disposed on the same plane, and preferably, the large ends of the buffer units are connected.
In an embodiment of the present invention, the buffer units are magnetic buffer units, and preferably, the adjacent magnetic buffer units maintain their bent states when the flexible display screen is bent.
In an embodiment of the invention, the elastic modulus of the first functional layer is different from the elastic modulus of the second functional layer, and the memory material layer is disposed near the functional layer with a smaller elastic modulus.
In an embodiment of the invention, the first functional layer cover plate and the second functional layer are polarizers.
In an embodiment of the invention, the shape memory material is selected from one or more of polyimide materials, polyurethane materials, polystyrene materials or polymethyl methacrylate materials.
The flexible display device comprises the flexible display screen.
According to the flexible display screen and the flexible display device, the memory material layers and the buffer layers are arranged in a laminated mode, the flexibility among the functional film layers is improved by utilizing the characteristic that the memory material layers have strong deformation capacity, the problem of peeling of the display screen caused by relative sliding among the film layers in the bending process is solved, meanwhile, the buffer layers are arranged on the memory material layers, and the problem of wrinkling of the functional film layers of the display screen in the film layer stacking direction is solved in the bending process of the display screen.
Drawings
Fig. 1 is a schematic cross-sectional view of a flexible display according to an embodiment of the invention.
Fig. 2 is a schematic view illustrating an application state of a flexible display according to an embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view of a flexible display according to an embodiment of the invention.
Fig. 4 is a schematic view illustrating an application state of a flexible display according to an embodiment of the present invention.
Fig. 5 is a schematic cross-sectional view of a flexible display according to an embodiment of the invention.
Fig. 6 is a schematic view illustrating an application state of a flexible display according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Fig. 1 is a schematic cross-sectional view of a flexible display according to an embodiment of the invention. As shown in fig. 1, the flexible display screen includes a first functional layer 01 and a second functional layer 03, and the first functional layer 01 and the second functional layer 03 are fixedly connected through a memory material layer 02.
The first functional layer 01 and the second functional layer 03 may be one of functional layers such as a barrier film layer, a cover plate layer, a polarizer layer, and a sealing film layer, and the elastic modulus of each functional layer is not uniform.
And the memory material layer 02 is used for forming opposite surfaces with differential deformation and is fixedly bonded with the adjacent functional layer. When the opposite surface of the memory material layer 02 is bent, one surface is elastically extended and deformed along with the larger bending direction, and the other surface is elastically extended and deformed along with the smaller bending direction, so that the memory material layer is kept to be attached and fixed with an adjacent functional layer while elastic extension is formed.
Fig. 2 is a schematic view illustrating an application state of a flexible display according to an embodiment of the present invention. As shown in fig. 2, when the flexible display screen is bent, the first functional layer 01 combined with the inner side of the memory material layer 02 forms a strong elastic deformation stress to be transmitted to the inner side surface of the memory material layer 02 attached and fixed due to the modulus characteristic, the large bending angle and the small bending radius, so that the inner side surface of the memory material layer 02 forms a large elastic extension to offset the elastic deformation stress of the first functional layer 01. Meanwhile, the second functional layer 03 combined with the outer side of the memory material layer 02 forms smaller elastic deformation stress to be transmitted to the outer side surface of the memory material layer 02 fixed in a fitting manner due to the modulus characteristic, the larger bending angle and the larger bending radius, so that the outer side surface of the memory material layer 02 forms smaller elastic extension to offset the elastic deformation stress of the second functional layer 03. The extension degrees of the inner side surface and the outer side surface of the memory material layer 02 are inconsistent, so that the elastic deformation stress difference of each adjacent functional layer is offset through the displacement difference of the inner side surface and the outer side surface of the memory material layer 02, the second functional layer 03 on the outer side is prevented from being subjected to overlarge tensile force, the overall resilience stress of the flexible display screen is reduced, and the use defects of film falling, folding, breaking, bubbling and the like caused by overlarge deformation stress are avoided.
As shown in fig. 2, in the embodiment of the present invention, after the flexible display screen is bent in an oriented manner, due to different extension degrees, the memory material layer 02 and the adjacent functional layer with the same original size form a step-shaped outline 04 at the edge of the screen, which causes stretching and squeezing of the existing packaging structure, and is likely to damage the packaging structure in the using process of the flexible display screen.
Fig. 3 is a schematic cross-sectional view of a flexible display according to an embodiment of the invention. As shown in fig. 3, on the basis of the basic structure of the above embodiment, the edge of the first functional layer 01 located at the inner side of the bending direction is cut, so that the projection profile of the first functional layer 01 to the second functional layer 03 is smaller than the profile of the second functional layer 03, the edge of the inner side surface of the memory material layer 02 is flush with the edge of the first functional layer 01, and the edge of the outer side edge of the memory material layer 02 is flush with the edge of the second functional layer 03. And performing edge encapsulation on the basis.
Fig. 4 is a schematic view illustrating an application state of a flexible display according to an embodiment of the present invention. As shown in fig. 4, after the flexible display screen is bent in an oriented manner, the functional layers and the memory material layer 02 have smooth and flush outlines, so that no additional deformation pressure is generated on the existing packaging structure, and the stability of the packaging structure after the flexible display screen is bent in an oriented manner is maintained.
In an embodiment of the present invention, the memory material layer 02 is an oca (optical Clear adhesive) optical adhesive with a small elastic modulus and a high viscosity. This allows for the utilization of the low elastic modulus properties of the OCA optical cement to create a large relative deformation of the opposing surfaces of the memory material layer 02 while maintaining adhesion to adjacent functional layers.
In an embodiment of the present invention, the memory material layer 02 is formed by laminating two kinds of OCA optical adhesives having elastic moduli, the modulus of each kind of OCA optical adhesive corresponds to the elastic deformation stress of an adjacent functional layer, a functional layer having a stronger elastic deformation stress corresponds to an OCA optical adhesive having a smaller modulus, and a functional layer having a weaker elastic deformation stress corresponds to an OCA optical adhesive having a larger modulus. The OCA optical cement with different elastic moduli can be used for offsetting the elastic deformation stress of different functional layers, and the laminated OCA optical cement is used for forming a bonding whole for offsetting the elastic deformation stress in different directions.
The memory material layer 02 material in the above embodiments of the present invention has a common defect, that is, after the flexible display screen is bent for several times in practical applications, the elastic deformation characteristic of the memory material layer 02 material is lost due to the physicochemical characteristics of the material, so that the memory material layer 02 material is damaged, and the screen has defects.
In one embodiment of the present invention, the memory material layer 02 includes a shape memory material. The shape memory material layer 02 is formed in an unbent state from an initial shape in an initial processing state by utilizing the one-way shape memory effect of the shape memory material. After the flexible display screen is bent for a plurality of times, the one-way shape memory effect is activated by utilizing a thermal signal or an electric signal, so that the memory material layer 02 recovers the internal microstructure of the material under the initial shape of the shape memory material in a non-bent state, and the original basic physical characteristics are maintained again.
In an embodiment of the present invention, the shape memory material used for the memory material layer 02 includes a shape memory alloy or a shape memory organic material. Those skilled in the art can understand that the shape memory material can be formed by deposition, spray coating or spin coating under a certain temperature or pressure environment, and the viscosity of the shape memory material is realized by material surface modification and is fixedly attached to the adjacent functional layer.
In an embodiment of the present invention, the shape memory material used for the memory material layer 02 may include a transparent polyimide material, a polyurethane material, a Polystyrene (PS) material, or a polymethyl methacrylate (PMMA) material with shape memory characteristics. The shape memory material belongs to Shape Memory Polymers (SMP), is formed by adopting a crosslinking method, a copolymerization method and a molecular self-assembly process, and has high light transmittance. The surface layer of the material surface material has the characteristics of pressure-sensitive adhesive by containing polyurethane, polyacrylate and organosilicon polymerization components, so that the adhesion is enhanced due to compression, and the bonding effect can be realized.
In an embodiment of the invention, the memory material layer 02 is made of a shape memory material, and opposite surfaces of the memory material layer 02 are fixedly attached to adjacent functional layers.
In an embodiment of the present invention, the memory material layer 02 is made of a shape memory material, and a layer of small elastic modulus and high viscosity OCA optical cement is laminated and bonded on one surface of the memory material layer 02 for being fixedly attached to an adjacent functional layer. Therefore, the selectivity of the shape memory material can be increased, and the elastic deformation stress of part of the functional layer is eliminated by using the OCA optical cement.
In an embodiment of the present invention, the memory material layer 02 is made of a shape memory material, and the opposite surfaces of the memory material layer 02 are respectively laminated with small elastic modulus and high viscosity OCA optical cement for being fixedly attached to the adjacent functional layers. Therefore, the selectivity of the shape memory material can be increased, the elastic deformation stress of the corresponding functional layer is eliminated by using the OCA optical cement, and the repeated bending process is performed by using the shape memory material.
Fig. 5 is a schematic cross-sectional view of a flexible display according to an embodiment of the invention. As shown in fig. 5, on the basis of the above-mentioned embodiment, the memory material layer 02 is directly laminated and contacted with a buffer layer 022. The memory material layer 02 is made of a shape memory material, and the buffer layer 022 includes a magnetically controlled buffer unit.
The memory material layer 02 of the flexible display screen of the embodiment of the invention is matched with the buffer layer 022 in a structure of attaching or embedding. The elastic deformation stress difference of adjacent functional layers when the memory material layer 02 guarantees that the display screen is bent is offset through the displacement difference of the inner side surface and the outer side surface of the memory material layer 02, the use defects of film falling, folding, breaking, bubbling and the like caused by overlarge deformation stress are avoided, the buffer layer 022 changes along with the shape change of the memory material layer, and the stable state when the display screen is bent is guaranteed.
As shown in fig. 5, the buffer layer 022 is embedded into the memory material layer 02, the buffer layer 022 includes a plurality of buffer units 0222 that evenly arrange at intervals, the buffer unit 0222 is the boss, the profile of the big end 0225 of boss is greater than the profile of little end 0224, the surface of the little end 0224 of boss is in the coplanar, set up towards the memory material layer 02, the surface of the big end 0225 of boss is in the coplanar, laminate with adjacent second functional layer 03, when the flexible display screen is buckled and is put in place, the side 0223 of adjacent buffer unit 0222 can laminate adjacently.
In one embodiment of the invention, the large ends 0225 of the bosses are connected at their edges. The size of the area formed by the large end 0225 of the boss is kept fixed, and meanwhile, the shape change of the boss along with the bending of the display screen can be met.
In an embodiment of the present invention, the gap between the buffer units 0222 is preferably 5% to 40% of the height of the buffer units 0222. In the optimal range, the attraction trend can be kept to be slowly increased in the mutual attraction process of the buffer unit 0222, and the phenomenon that the display screen is potentially damaged due to rapid attraction impact is avoided. Meanwhile, the size of the buffer layer close to one side of the memory material is ensured to be flexibly changed along with the bending of the display screen.
Fig. 6 is a schematic view illustrating an application state of a flexible display according to an embodiment of the present invention. As shown in fig. 6, in practical applications, the buffer layer 022 is bent in place along with the flexible display screen, and the buffer unit 0222 is controlled to generate magnetism, so that the buffer unit 0222 attached to the side surface generates attraction force to maintain the bent state of the flexible display screen.
In an embodiment of the present invention, the magnetically controlled buffer unit 0222 as a magnetic buffer unit can provide a suction force corresponding to a bending angle during the bending process of the flexible display screen by using the continuously variable suction force of the adjacent magnetic buffer units, so as to avoid changing a natural bending speed and a usage habit.
In an embodiment of the invention, the buffer layer is stacked with the memory material layer, and an orthographic projection area of the buffer layer is smaller than that of the memory material layer. And arranging annular OCA optical cement which is consistent with the outline of the memory material layer at the peripheral edge of the buffer layer. So that one side of the memory material layer 02 is bonded with the adjacent functional layer, and the other side of the memory material layer 02 is fixed with the adjacent functional layer through the OCA optical cement and the buffer unit 0222.
In one embodiment of the present invention, the memory material layer 02 is disposed adjacent to the functional layer with a smaller elastic modulus.
In an embodiment of the invention, the first functional layer is a cover plate, and the second functional layer is a polarizer. The flexibility of the cover plate is utilized to form the inward-rolling bending, so that the display screen can be better protected.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (12)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810620256.0A CN108831301B (en) | 2018-06-15 | 2018-06-15 | Flexible display screen and flexible display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810620256.0A CN108831301B (en) | 2018-06-15 | 2018-06-15 | Flexible display screen and flexible display device |
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| CN108831301A CN108831301A (en) | 2018-11-16 |
| CN108831301B true CN108831301B (en) | 2021-04-27 |
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| CN201810620256.0A Active CN108831301B (en) | 2018-06-15 | 2018-06-15 | Flexible display screen and flexible display device |
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| CN109559639B (en) * | 2018-11-29 | 2022-04-05 | 广州国显科技有限公司 | Display panel and display device |
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| CN109360498A (en) * | 2018-11-30 | 2019-02-19 | 云谷（固安）科技有限公司 | A kind of flexible display panels and flexible display apparatus |
| CN109671357B (en) * | 2019-01-08 | 2020-12-11 | 昆山工研院新型平板显示技术中心有限公司 | Display device |
| CN111462619B (en) * | 2019-01-18 | 2022-02-01 | 昆山工研院新型平板显示技术中心有限公司 | Stretchable display device and manufacturing method thereof |
| CN109859634B (en) * | 2019-03-25 | 2020-09-01 | 武汉华星光电半导体显示技术有限公司 | Foldable display device |
| CN110264887A (en) * | 2019-07-01 | 2019-09-20 | 云谷（固安）科技有限公司 | A kind of flexible display screen and display device |
| CN110459135A (en) * | 2019-08-28 | 2019-11-15 | Oppo广东移动通信有限公司 | Flexible display screen and flexible display device |
| CN110517590B (en) * | 2019-08-30 | 2021-07-23 | 上海中航光电子有限公司 | A display device and a method for manufacturing the same |
| CN110634404B (en) * | 2019-08-30 | 2021-03-16 | 武汉华星光电半导体显示技术有限公司 | Cover plate and flexible display device |
| CN110556059A (en) * | 2019-09-03 | 2019-12-10 | 武汉华星光电半导体显示技术有限公司 | flexible display device and method for improving stability thereof |
| CN110610974B (en) * | 2019-09-20 | 2022-11-29 | 昆山工研院新型平板显示技术中心有限公司 | Display panel, manufacturing method thereof and display terminal |
| CN110599913B (en) * | 2019-10-31 | 2022-02-15 | 云谷（固安）科技有限公司 | Flexible display panel and flexible display device |
| CN111063259A (en) | 2019-12-17 | 2020-04-24 | 武汉华星光电半导体显示技术有限公司 | Flexible display device |
| CN112002219B (en) | 2020-06-30 | 2023-05-23 | 联想(北京)有限公司 | Electronic equipment |
| CN111968505B (en) * | 2020-07-31 | 2022-04-19 | 昆山国显光电有限公司 | Laminating system and laminating device for curved surface display device |
| CN111951683B (en) | 2020-08-24 | 2022-06-07 | 京东方科技集团股份有限公司 | Display device |
| CN112396964A (en) * | 2020-11-17 | 2021-02-23 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN112489559B (en) * | 2020-11-27 | 2022-06-07 | 合肥维信诺科技有限公司 | Supporting structure and display device |
| CN113053245B (en) | 2021-03-11 | 2023-02-28 | 京东方科技集团股份有限公司 | Profiling equipment, bonding device, bonding method and display device |
| CN113077721B (en) * | 2021-04-16 | 2022-08-05 | 合肥维信诺科技有限公司 | Display panel, manufacturing method thereof and display device |
| CN114049839B (en) * | 2021-11-11 | 2023-06-06 | 武汉天马微电子有限公司 | Flexible screen and wrinkle removing method thereof |
| CN115525100B (en) * | 2022-01-11 | 2023-07-07 | 荣耀终端有限公司 | Display module and electronic equipment |
| CN115691335B (en) * | 2022-11-02 | 2024-02-13 | 苏州恒悦新材料股份有限公司 | OLED support film based on flexible screen body |
| WO2025108552A1 (en) * | 2023-11-24 | 2025-05-30 | Huawei Technologies Co., Ltd. | Flexible display stack |
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