CN110751908A - Flexible display panel, manufacturing method thereof and flexible display terminal - Google Patents
Flexible display panel, manufacturing method thereof and flexible display terminal Download PDFInfo
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- CN110751908A CN110751908A CN201911038245.2A CN201911038245A CN110751908A CN 110751908 A CN110751908 A CN 110751908A CN 201911038245 A CN201911038245 A CN 201911038245A CN 110751908 A CN110751908 A CN 110751908A
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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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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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Abstract
The invention provides a display panel which is characterized in that the flexible display panel is divided into a bending area and a non-bending area; the flexible display panel comprises a supporting leveling plate located in the non-bending area, the supporting leveling plate is located on one side, deviating from the light emitting direction, of the flexible display panel and is used for supporting and leveling the flexible display panel located in the non-bending area. One side of deviating from the light-emitting direction through at the regional flexible display panel of non-bending sets up the support leveling plate, neither influences the regional degree of buckling, has strengthened the regional straightness and the surface smoothness of non-bending again, and then reduces flexible display panel's plastics and feels, strengthens flexible display panel's senior sense.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel, a manufacturing method thereof and a flexible display terminal.
Background
With the continuous development of display technology, flexible display devices are receiving attention. In order to ensure the bending performance of the flexible display panel, the flexible display panel in the prior art adopts PI (Polyimide) or CPI (ColorlessTransparent Polyimide) as a structural material. Although the flexibility of PI or CPI can satisfy the demand of flexible display panel bendability, PI or CPI itself Young's modulus is low and straightness poor, and the flexible display panel surface after carrying out full laminating is easy unevenness, roughness low and straightness poor for flexible display panel's plastics are felt extremely strong, lack high-grade sense, thereby influence the user and use and feel.
Disclosure of Invention
In view of this, embodiments of the present invention provide a flexible display panel to solve the technical problems of the prior art that the surface flatness of the flexible display panel is low and the plastic feeling is strong and the high-grade feeling is poor due to poor straightness.
According to an aspect of the present invention, an embodiment of the present invention provides a flexible display panel, which is divided into a bending region and a non-bending region; the flexible display panel comprises a supporting leveling plate located in the non-bending area, the supporting leveling plate is located on one side, deviating from the light emitting direction, of the flexible display panel and is used for supporting and leveling the flexible display panel located in the non-bending area.
In one embodiment, the flexible display panel includes a buffer function layer, an organic light emitting device layer, an encapsulation layer, and a cover plate, which are sequentially stacked, the support leveling plate is located on a side of the buffer function layer away from the organic light emitting device layer, and a projection of the support leveling plate on a plane where the cover plate is located coincides with a projection of the non-bending region on a plane where the cover plate is located.
In one embodiment, the young's modulus of the material of the supporting leveling plate is greater than or equal to 194020 MPa.
In one embodiment, the material of the support leveling plate comprises one of the following materials: steel plate, glass or amorphous material.
In one embodiment, the thickness of the support plate is greater than or equal to 0.1 mm.
In one embodiment, the flexible display panel located at the non-bending region further includes: and an adhesive layer is solidified between the buffer function layer and the support leveling plate.
In one embodiment, the material of the cured adhesive glue layer comprises an optically clear glue.
In one embodiment, the buffer function layer includes: the bearing steel plate and the buffer foam layer are sequentially stacked along the direction of the supporting flat plate close to the organic light-emitting device layer; the thickness of the bearing steel plate is less than or equal to 50 μm; the material of the supporting leveling plate is a steel plate, and the supporting leveling plate can be integrally prepared on the bearing steel plate.
According to another aspect of the present invention, an embodiment of the present invention provides a method for manufacturing a flexible display panel, the flexible display panel being divided into a bending region and a non-bending region; the manufacturing method comprises the following steps: and preparing a support flat plate on one side of the flexible display panel, which is positioned in the non-bending area and deviates from the light emergent direction.
According to still another aspect of the present invention, an embodiment of the present invention provides a flexible display terminal, including: the flexible display panel of any of the preceding claims; a housing for nesting the flexible display panel; and a support connection plate for further supporting the flexible display panel and connecting the flexible display panel and the housing.
According to the flexible display panel provided by the embodiment of the invention, the supporting flat plate is arranged on the side, away from the light emitting direction, of the flexible display panel in the non-bending area, so that the bending degree of the bending area is not influenced, and the straightness and the surface flatness of the non-bending area are enhanced. Because the bending area is not provided with the supporting flat plate, the bending performance of the bending area is not influenced. And set up in the regional flexible module that supports the levelling plate of non-bending and can provide the rigidity for the regional non-bending and support, improved the technical problem that takes place flexible deformation in flexible module full lamination technology to flexible display panel surface rugged problem after having improved full lamination has improved, and then has improved flexible display panel's surface smoothness. The setting of supporting the leveling plate can also improve the flexible display panel and appear sunken scheduling problem when suffering external force striking, has further improved flexible display panel's surface smoothness, and then reduces flexible display panel's plastics and feels, has strengthened flexible display panel's senior sense.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention.
Fig. 3 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention.
Fig. 4 is a schematic flow chart illustrating a method for manufacturing a flexible display panel according to an embodiment of the present invention.
Detailed Description
As described in the background art, there is a technical problem in the prior art that the surface flatness of the flexible display panel is low and the plastic feeling is strong and the quality feeling is poor due to poor straightness. The reason why such a problem occurs is as follows. In order to ensure the bending performance of the flexible display panel, the flexible display panel adopts PI or CPI instead of the traditional glass as the material of the cover plate or the substrate. PI or CPI has good bending resistance, but the Young modulus, the straightness and the fatigue strength of PI or CPI are not as good as those of glass, and the PI or CPI is used as a structural material and cannot provide support like the glass. The internal structure of the flexible display panel cannot provide support for the flexible display panel itself. Flexible display panel can be connected through the supporting connection board with shells such as center and backplate, though the young modulus height and the straightness accuracy height of supporting connection board, but the supporting connection board is through assembly connection with flexible display panel, thereby can drive the supporting connection board and drive flexible display panel and buckle in order to guarantee that folding device's shell is folding, there is the glue that slides between supporting connection board and the flexible display panel, it has the unable supporting force transmission with the supporting connection board of buffer function and gives flexible display panel to slide to glue the softness. The housing connector also fails to provide support for the flexible display panel. Due to insufficient supporting force, the surface of the flexible display panel is prone to be uneven and not firm, so that the plastic feeling is strong and the high-grade feeling is low.
In order to solve the above problems, the inventors have studied and found that if the bending property of the cover plate in the bending region is made strong and the straightness of the cover plate in the non-bending region is made high by changing the young's modulus of the bending region and the non-bending region of the cover plate, the light transmittance of the flexible display panel is affected. If the supporting force and the straightness of the flexible display panel are changed by changing the connection relationship between the supporting connecting piece and the flexible display panel, the sliding of the supporting connecting piece of the folding screen is influenced. One side of deviating from the light-emitting direction through at the regional flexible display panel of non-bending sets up the support leveling plate, provides the rigidity for the regional flexible module of non-bending and supports to neither influence the regional degree of buckling, strengthened the regional straightness and the surface smoothness of non-bending again.
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 structural diagram of a flexible display panel according to an embodiment of the present invention. As shown in fig. 1, the flexible display panel is divided into a bending region and a non-bending region; the flexible display panel comprises a supporting flat plate 5 located in a non-bending area, wherein the supporting flat plate 5 is located on one side of the flexible display panel, which is deviated from the light emitting direction, and is used for supporting and flatly locating the flexible display panel in the non-bending area.
In the embodiment of the invention, the supporting flat plate 5 is arranged on one side of the flexible display panel in the non-bending area, which is far away from the light emitting direction, so that rigid support is provided for the flexible module in the non-bending area, and the problem of flexible deformation of the flexible module in the full-lamination process is solved, thus the problem of uneven surface of the flexible display panel after full lamination is solved, and the surface flatness of the flexible display panel is improved. The setting of supporting leveling plate 5 also can avoid flexible display panel to appear the condition such as sunken when suffering external impact, further improves flexible display panel's surface smoothness, and then reduces flexible display panel's plastics and feels, strengthens flexible display panel's senior sense.
It should be understood that the supporting flat plate 5 is a layer in the flexible display panel, and is a supporting structure inside the flexible display panel itself, not an external supporting structure of the flexible display panel, and the supporting flat plate 5 is different from the connecting supporting plate of the connecting housing.
In one embodiment, the flexible display panel includes a buffer function layer 1, an organic light emitting device layer 2, an encapsulation layer 3, and a cover plate 4, which are sequentially stacked, a support flat plate 5 is located on a side of the buffer function layer 1 away from the organic light emitting device layer 2, and a projection of the support flat plate 5 on a plane where the cover plate 4 is located coincides with a projection of the non-bending region on a plane where the cover plate 4 is located.
The projection of the supporting flat plate 5 on the plane of the cover plate 4 coincides with the projection of the non-bent area on the plane of the cover plate 4. So set up, support leveling plate 5 can be more comprehensive support non-bending region, avoid appearing supporting the dead angle, effectively avoid non-bending region to appear the condition such as sunken when receiving external force striking.
The buffer function layer 1 is a film layer which is farthest away from the display light emitting direction in the display panel, and the support leveling plate 5 needs to be positioned on one side of the buffer function layer 1 away from the organic light emitting device layer 2; the supporting flat plate 5 needs to be able to support and flat the flexible display panel located in the non-bending region. The supporting flat plate 5 only needs to satisfy the above conditions, and the specific material of the supporting flat plate 5 and the specific connection form with the buffer functional layer 1 are not limited in the embodiment of the present invention.
It should also be understood that the bending region refers to a region where the flexible display device of the flexible display panel configuration is bent and stretched when bent, and the non-bending region refers to a region where the flexible display device of the flexible display panel configuration is not bent when bent. The bending area and the non-bending area can be divided according to different types of flexible display panels and different application scenes, and the specific division of the bending area and the non-bending area is not limited in the embodiment of the invention.
It should also be understood that the functional buffer layer 1 may be a multilayer structure including a bearing steel plate, a buffer foam layer, and an optically transparent adhesive layer, which are sequentially stacked in a direction in which the support flat plate is close to the organic light emitting device layer, and may also include other layers, and the specific structure of the functional buffer layer 1 is not limited in the embodiment of the present invention.
It should also be understood that the organic light emitting device layer 2 includes conventional film layers such as a TFT (Thin film transistor) layer, a display light emitting layer, and the like, which are provided in a conventional flexible display panel.
It should also be understood that the encapsulation layer 3 may be a multilayer structure including an organic layer and an inorganic layer stacked in sequence, and the specific structure of the encapsulation layer 3 is not limited in the embodiment of the invention.
It should also be understood that the flexible display panel may also include conventional film layers such as a touch layer and a polarizer layer that conventional flexible display panels have.
In one embodiment, the young's modulus of the material supporting the flattening plate 5 is equal to or greater than 194020 MPa. The Young modulus is a physical quantity for representing tensile or compressive resistance of a material within an elasticity limit, the rigidity of the material is marked by the magnitude of the Young modulus, and the larger the Young modulus is, the less deformation is generated. The young's modulus of the material supporting the flattening plate 5 is too small to support, so that the young's modulus of the elastic supporting plate is set to be greater than or equal to 194020MPa, and the supporting flattening plate 5 is ensured to give enough supporting force to the flexible display panel in the non-bending region.
In one embodiment, the material supporting the leveling plate 5 comprises one of the following: steel plate, glass or amorphous material. Steel plates, glass or amorphous materials are common materials with high Young's modulus, are easy to obtain, are convenient to prepare and have low economic cost.
It should be understood that the steel plate may be an SUS304 steel plate as long as the young's modulus of the steel plate is 194020MPa or more, and the specific type of the steel plate is not limited in the embodiments of the present invention. Amorphous materials are solids in which the arrangement of atoms or molecules is randomly distributed. Amorphous materials, also called amorphous or glassy materials, are a large class of rigid solids having a high hardness comparable to that of crystalline materials. The amorphous material may be an amorphous material such as quartz glass or metallic glass, as long as the young's modulus of the selected amorphous material is greater than or equal to 194020MPa, and the embodiment of the present invention does not limit the specific type of the amorphous material.
In one embodiment, the thickness of the supporting levelling plate 5 is greater than or equal to 0.1 mm. If the thickness of supporting the leveling plate 5 is too thin, the supporting effect is limited, the straightness of the flexible display panel in the non-bending area is limited, the thickness of supporting the leveling plate 5 is set to be larger than or equal to 0.1mm, the flexible display panel in the non-bending area can be guaranteed to have enough straightness, plastic sense is reduced, and high-grade sense is enhanced.
Fig. 2 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention. As shown in fig. 2, the flexible display panel located in the non-bending region further includes: and curing an adhesive layer 6 between the buffer function layer 1 and the support flat plate 5.
The cured adhesive layer 6 is used for attaching and supporting the buffer function layer 1 on the side away from the organic light-emitting device layer 2.
It should be understood that the cured adhesive glue layer 6 refers to a glue layer that can be cured and that the cured glue layer has a certain young's modulus. The cured adhesive layer 6 may be a commonly used optical transparent adhesive layer, or may be other adhesives satisfying the above conditions, and the embodiment of the present invention does not limit the specific form of the cured adhesive layer 6.
In one embodiment, the material of the cured adhesive glue layer 6 comprises an optically clear glue. The optically clear adhesive has a strong young's modulus after curing, and can transfer the supporting force of the supporting flat plate 5 to the flexible display film layer of the non-bending region. In addition, the optically transparent adhesive does not affect the display performance of the flexible display panel.
Fig. 3 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention. As shown in fig. 3, the buffer functional layer 1 includes: the bearing steel plate 11 and the buffer foam layer 12 are sequentially stacked along the direction of the supporting flat plate close to the organic light-emitting device layer; the thickness of the bearing steel plate 11 is less than or equal to 50 μm; the supporting flat plate 5 is made of a steel plate, and the supporting flat plate 5 can be integrally manufactured on the bearing steel plate 11.
The steel plate is a relatively common supporting material, and the buffer function layer 1 of the flexible display panel also has a layer of bearing steel plate 11, but because the bearing steel plate 11 is arranged in a bending area and a non-bending area at the same time, in order to ensure the bending property of the flexible display panel, the thickness of the bearing steel plate 11 is very thin and is not enough to support the flexible display panel, and therefore the supporting flat plate 5 needs to be additionally arranged in the non-bending area. When the material of the supporting flat plate 5 is a steel plate, the supporting flat plate 5 can be integrally formed on the bearing steel plate 11. The thickness of the bearing steel plate 11 in the bending area is less than or equal to 50 μm, and the thickness of the bearing steel plate 11 in the non-bending area is the same as the thickness of the bearing steel plate 11 and the supporting flat plate 5 which are separately arranged. The supporting flat plate 5 is integrally prepared on the bearing steel plate 11, so that the material can be saved and the working procedures can be reduced.
It should be understood that the bearing steel plate 11 may be an SUS304 steel plate, or may be another type of steel plate, and the embodiment of the present invention does not limit the specific type of the bearing steel plate 11.
Fig. 4 is a schematic flow chart illustrating a method for manufacturing a flexible display panel according to another aspect of the present invention. The flexible display panel is divided into a bending area and a non-bending area; as shown in fig. 4, the manufacturing method includes the following steps.
Step 401: and preparing a support flat plate on one side of the flexible display panel, which is positioned in the non-bending area and deviates from the light emergent direction.
Before step 401, further comprising:
step 400: and preparing a buffer function layer, an organic light-emitting device layer, a packaging layer and a cover plate which are sequentially stacked.
In the embodiment of the invention, the support leveling plate is prepared on the side, away from the organic light-emitting device layer, of the buffer function layer in the flexible display panel positioned in the non-bending area, so that the bending degree of the bending area is not influenced, the straightness and the surface flatness of the non-bending area are enhanced, the plastic feeling of the flexible display panel is further reduced, and the high-grade feeling of the flexible display panel is enhanced.
According to still another aspect of the present invention, an embodiment of the present invention provides a flexible display terminal, including: the flexible display panel of any of the preceding; a housing for nesting the flexible display panel; and a support connection plate for further supporting the flexible display panel and connecting the flexible display panel and the housing.
In the embodiment of the invention, the flexible display panel is adopted to construct the flexible display terminal, so that the display effect of the flexible display terminal is not influenced, and the straightness and the surface smoothness of the non-bending area of the flexible display terminal are improved on the premise of not influencing the bending effect of the bending area of the flexible display terminal, thereby reducing the plastic feeling of the flexible display terminal and enhancing the high-grade feeling of the flexible display terminal. The use experience of the user is improved.
It should be understood that if the flexible display terminal is a mobile phone, the housing includes a middle frame and a back plate, and the support connection plate is a connection member connecting the back plate and the flat plate. The supporting connection member may be set according to different kinds of specific flexible terminals, and the embodiment of the present invention does not limit the specific form of the supporting connection plate. The material of the supporting and connecting plate can be plastic or metal, and the specific material of the supporting and connecting plate is not limited in the embodiment of the invention.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
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 (10)
1. A flexible display panel is characterized in that the flexible display panel is divided into a bending area and a non-bending area; the flexible display panel comprises a supporting leveling plate located in the non-bending area, the supporting leveling plate is located on one side, deviating from the light emitting direction, of the flexible display panel and is used for supporting and leveling the flexible display panel located in the non-bending area.
2. The flexible display panel according to claim 1, wherein the flexible display panel comprises a buffer function layer, an organic light emitting device layer, an encapsulation layer, and a cover plate, which are sequentially stacked, the support leveling plate is located on a side of the buffer function layer away from the organic light emitting device layer, and a projection of the support leveling plate on a plane of the cover plate coincides with a projection of the non-bending region on the plane of the cover plate.
3. The flexible display panel of claim 1, wherein the young's modulus of the material supporting the planarizing plate is greater than or equal to 194020 MPa.
4. The flexible display panel of claim 3, wherein the material supporting the planarizing plate comprises one of: steel plate, glass or amorphous material.
5. The flexible display panel of claim 1, wherein the support flat plate has a thickness greater than or equal to 0.1 mm.
6. The flexible display panel of claim 2, wherein the flexible display panel at the non-bending region further comprises: and an adhesive layer is solidified between the buffer function layer and the support leveling plate.
7. The flexible display panel of claim 6, wherein the material of the cured adhesive glue layer comprises an optically clear glue.
8. The flexible display panel of claim 2, wherein the buffer functional layer comprises: the bearing steel plate and the buffer foam layer are sequentially stacked along the direction of the supporting flat plate close to the organic light-emitting device layer; the thickness of the bearing steel plate is less than or equal to 50 μm; the material of the supporting leveling plate is a steel plate, and the supporting leveling plate can be integrally prepared on the bearing steel plate.
9. The manufacturing approach of a flexible display panel, characterized by, the said flexible display panel is divided into bending area and non-bending area; the manufacturing method comprises the following steps: and preparing a support flat plate on one side of the flexible display panel, which is positioned in the non-bending area and deviates from the light emergent direction.
10. A flexible display terminal, comprising:
the flexible display panel of any one of claims 1-7;
a housing for nesting the flexible display panel; and
and the supporting connecting plate is used for further supporting the flexible display panel and connecting the flexible display panel and the shell.
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| CN201911038245.2A CN110751908A (en) | 2019-10-29 | 2019-10-29 | Flexible display panel, manufacturing method thereof and flexible display terminal |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111640770A (en) * | 2020-06-05 | 2020-09-08 | 京东方科技集团股份有限公司 | Flexible display assembly and flexible display device |
| CN111724680A (en) * | 2020-06-09 | 2020-09-29 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel, preparation method thereof and flexible display device |
| CN111986575A (en) * | 2020-08-31 | 2020-11-24 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN112116875A (en) * | 2020-10-13 | 2020-12-22 | 武汉华星光电半导体显示技术有限公司 | Foldable display module |
| CN112614433A (en) * | 2020-12-29 | 2021-04-06 | 武汉华星光电半导体显示技术有限公司 | Flexible display panel and flexible display device |
| CN113129747A (en) * | 2021-04-06 | 2021-07-16 | 武汉华星光电技术有限公司 | Packaging cover plate and display device |
| CN113496652A (en) * | 2020-04-08 | 2021-10-12 | 深圳市柔宇科技有限公司 | Display panel and electronic device |
| CN114424271A (en) * | 2020-07-31 | 2022-04-29 | 京东方科技集团股份有限公司 | Display module and display device |
| CN114927063A (en) * | 2022-05-27 | 2022-08-19 | 武汉华星光电半导体显示技术有限公司 | Folding display device |
| CN115394187A (en) * | 2022-07-14 | 2022-11-25 | 合肥维信诺科技有限公司 | Supporting film group, display panel and preparation method of display panel |
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