CN115064068B - Flexible display module and preparation method thereof - Google Patents
Flexible display module and preparation method thereof Download PDFInfo
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- CN115064068B CN115064068B CN202210651531.1A CN202210651531A CN115064068B CN 115064068 B CN115064068 B CN 115064068B CN 202210651531 A CN202210651531 A CN 202210651531A CN 115064068 B CN115064068 B CN 115064068B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 230000008093 supporting effect Effects 0.000 claims abstract description 80
- 238000005452 bending Methods 0.000 claims abstract description 36
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- 239000000463 material Substances 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 17
- 229910001285 shape-memory alloy Inorganic materials 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000011368 organic material Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 5
- 238000004026 adhesive bonding Methods 0.000 claims description 3
- 239000010410 layer Substances 0.000 description 145
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- 229920001621 AMOLED Polymers 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
Abstract
The application provides a flexible display module and preparation method thereof, flexible display module includes: a flexible display panel including a bendable region; and the support part is positioned at one side of the flexible display panel, which is far away from the light emitting side, and comprises a support layer and a shape memory layer positioned at one side of the support layer, the support layer is provided with a support layer bending region matched with the bendable region, the shape memory layer corresponds to the support layer bending region, the shape memory layer is provided with elasticity and shape memory characteristics, and the shape memory layer provides prestress for the support layer. The application provides a flexible display module assembly through the fatigue performance that improves supporting part to improve flexible display module assembly's fatigue life.
Description
Technical Field
The application relates to the technical field of display, in particular to a flexible display module and a preparation method thereof.
Background
With the continuous development of flexible display module technology, display modules with different bending radii and folding forms are attracting attention. However, due to the influence of the bending property of the supporting material, the bending shape and the bending radius of the flexible display module are limited. The traditional support material has the problems of poor fatigue resistance and low service life in the repeated bending process of the support material, and further influences the service life of the flexible display module.
Disclosure of Invention
In view of this, the present application provides a flexible display module assembly, through improving the fatigue performance of supporting part to improve the fatigue life of flexible display module assembly.
The application provides a flexible display module assembly, include:
a flexible display panel including a bendable region; and
The support part is located one side of the flexible display panel, which is away from the light emitting side, the support part comprises a support layer and a shape memory layer located on one side of the support layer, the support layer is provided with a support layer bending area matched with the bendable area, the shape memory layer corresponds to the support layer bending area, the shape memory layer is provided with elasticity and shape memory characteristics, and the shape memory layer provides prestress for the support layer.
In an alternative embodiment of the present application, the shape memory layer is adhered and fixed to the surface of the supporting layer by means of gluing or welding.
In an alternative embodiment of the present application, the material of the shape memory layer is a shape memory alloy or a shape memory organic material.
In an alternative embodiment of the present application, the shape memory layer is located on a side of the support layer remote from the flexible display panel.
In an alternative embodiment of the present application, the shape memory layer is located on a side of the support layer adjacent to the flexible display panel.
In an optional embodiment of the present application, the support layer includes at least one first support rib and at least one second support rib, where the first support rib and the second support rib are disposed in a two-to-two intersecting manner, and have an intersecting portion, and the shape memory layer is located on the intersecting portion.
A preparation method of a flexible display module comprises the following steps:
stretching the shape memory material in the first state to a certain deformation degree; unloading the external force, and returning the shape memory material to a second state; fixing a shape memory material in a second state to one side surface of the support layer to form a shape memory layer; heating the support layer attached with the shape memory layer, and recovering the shape memory material to a first state; then cooling to obtain a supporting part;
providing a flexible display panel, wherein the flexible display panel comprises a bendable region; and
And attaching the support part to one side of the flexible display panel, which is away from the light emitting side, so that the shape memory layer corresponds to the bendable region.
In an alternative embodiment of the present application, the shape memory layer is attached to a side of the support layer away from the flexible display panel.
In an alternative embodiment of the present application, the shape memory layer is attached to a side of the support layer adjacent to the flexible display panel.
In an optional embodiment of the present application, the supporting layer includes at least one first supporting rib and at least one second supporting rib, where the first supporting rib and the second supporting rib are disposed in a two-to-two intersecting manner, and have an intersecting portion, and the shape memory layer is attached to the intersecting portion.
The application provides a flexible display module assembly, through be in the backing layer surface laminating shape memory material in backing layer bending zone, and heat, make shape memory material right the backing layer is exerted prestressing force, can effectively improve the fatigue performance of backing layer, is applied to flexible display module assembly with this backing portion that has shape memory layer, can improve flexible display module assembly's bending property, fatigue performance and life.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a flexible display module according to an embodiment of the present application.
Fig. 2 is a top view and a side view of a flexible display module supporting portion according to another embodiment of the present application.
Fig. 3 is a schematic diagram of a preparation flow of a flexible display module provided in the present application.
Fig. 4 is a schematic view of a state before and after heating a supporting portion of a flexible display module provided by the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application.
In the description of the present application, it should be understood that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the apparatus or element referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more of the described features. In the description of the present application, the meaning of "a plurality" is two or more, unless specifically defined otherwise.
The present application may repeat reference numerals and/or letters in the various examples, and such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
The flexible display module and the preparation method thereof provided by the application will be described in detail below with reference to specific embodiments and drawings.
In the prior art, due to the influence of the bending performance of the supporting material, the problems of poor fatigue resistance and low service life exist in the repeated bending process of the supporting material, and the service life of the flexible display module is further influenced.
The application provides a flexible display module assembly, through laminating shape memory material at the surface of supporting layer to heat, make shape memory material right the supporting layer is exerted prestressing force, in order to improve the fatigue performance of supporting part, thereby improve flexible display module assembly's fatigue life.
As shown in fig. 1, the present application provides a specific embodiment of a flexible display module 100.
The flexible display module 100 includes: a flexible display panel 10, the flexible display panel 10 including a bendable region (a region between dotted lines in fig. 1); and a supporting portion 20, which is located at a side of the flexible display panel 10 facing away from the light emitting side, the supporting portion 20 includes a supporting layer 21 and a shape memory layer 22 located at a side of the supporting layer 21, the supporting layer 21 has a supporting layer bending region (a region between dashed lines in fig. 1) matched with the bendable region, and the shape memory layer 22 corresponds to the supporting layer bending region. Because the flexible display panel is thinner, in practical product application, the flexible display module needs certain supporting and rebound resilience performance besides flexible deformation, so that a supporting layer with better bending performance needs to be attached to the flexible display panel to improve the overall performance of the display module.
Specifically, as shown in fig. 1, the flexible display module 100 further includes: a back plate layer 30 located between the support 20 and the flexible display panel 10; a polarizer 40 located on a side of the flexible display panel 10 away from the back plate layer 30; and a glass cover plate 50 positioned on one side of the polarizer 40 away from the flexible display panel 10, wherein the glass cover plate 50 and the polarizer 40 are bonded through a transparent optical adhesive layer 60.
The flexible display module 100 of the application is formed by attaching the shape memory layer 22 to the surface of the bending area of the support layer 21, and the shape memory effect of the shape memory material is utilized to provide prestress for the support layer 21, so that after the support layer 21 is provided with the prestress, the prestress can effectively reduce the stress amplitude of the support layer 21 in the bending process, and the fatigue life of the support layer 21 is prolonged.
The supporting layer 21 receives tensile stress during the bending process of the flexible display module 100, and the fatigue life of the supporting layer 21 is longer and longer along with the reduction of stress amplitude (the maximum tensile stress received during the bending process of the flexible display module), and the fatigue life is 10 generally 7 The corresponding stress amplitude is then the fatigue limit of the material. When a prestressing force is applied to the support layer 21, the stress amplitude of the support layer 21 can be correspondingly reduced, so that the fatigue life of the support layer 21 is increased.
In other embodiments, the shape memory layer 22 is adhered and fixed to the surface of the supporting layer 21 by gluing or welding, so as to avoid the shape memory layer 22 from separating from the supporting layer 21 during the manufacturing process, and to affect the bending performance and fatigue life of the supporting portion 20.
Specifically, the shape memory layer 22 is made of a planar material, the size of the shape memory layer 22 is adapted to the size of the bending area of the support layer 21, and can be adjusted according to the design and process conditions of the product, and the shape memory layer 22 is adhered to the surface of the bending area of the support layer on one side of the support layer 21 by using a high-temperature resistant adhesive, so that the shape memory layer 22 is firmly adhered to the support layer 21.
In other embodiments, the shape memory layer 22 may be welded to the surface of the bending area of the support layer 21 on one side of the support layer by means of laser welding, so that the shape memory layer 22 is firmly attached to the support layer 21.
In an alternative embodiment of the present application, the material of the shape memory layer 22 is a shape memory alloy or a shape memory organic material.
The material of the shape memory layer 22 may be a Shape Memory Alloy (SMA) including, but not limited to, copper-based memory alloy (CuAlNi), iron-based memory alloy (FeMnSi), titanium-based memory alloy (Ni-Ti), etc. Shape memory alloys have a more excellent shape memory effect, so the shape memory materials of the present application are preferably shape memory alloys.
In other embodiments, the material of the shape memory layer 22 may also be an organic material with shape memory function.
The shape memory material has two important properties, superelasticity and shape memory effect. Super-elasticity means that when the shape memory material deforms under the action of external force, even if the shape memory material deforms into nonlinearity, the shape memory material can be restored to a state before loading only by removing the external force; the shape memory effect means that the deformed shape memory material can be restored to its original shape with the increase of the external temperature. The shape memory material is fixed on the supporting layer material, and the prestress can be provided for the supporting layer material by utilizing the shape memory effect of the shape memory material so as to improve the fatigue life of the supporting layer material.
Specifically, the material of the supporting layer 21 is a metal or an organic material.
The material of the supporting layer 21 may be, but not limited to, a metal material such as stainless steel (SUS), and in this embodiment, preferably, a stainless steel material is used as the material of the supporting layer 21, and the stainless steel material has rigidity to ensure its supporting effect, and at the same time, has a certain elastic deformation capability to satisfy the elastic resilience of the stainless steel material during the bending process.
In other embodiments, the material of the supporting layer 21 may be an organic material with certain rigidity and bending property, and may match the shape memory organic material.
In an alternative embodiment of the present application, the shape memory layer 22 is located on a side of the support layer 21 remote from the flexible display panel 10.
In an alternative embodiment of the present application, the shape memory layer 22 is located on a side of the support layer 21 adjacent to the flexible display panel 10.
The shape memory layer 22 may be located on a side of the support layer 21 close to the flexible display panel 10, or may be located on a side of the support layer 21 away from the flexible display panel 10, where the shape memory layer 22 may apply a prestress to the support layer 21. Preferably, the shape memory layer 22 is located on a side of the support layer 21 away from the flexible display panel 10, where the shape memory layer 22 has little effect on the display of the flexible display module 100.
In an alternative embodiment of the present application, the supporting layer 21 includes at least one first supporting rib 211 and at least one second supporting rib 212, where the first supporting rib 211 and the second supporting rib 212 are disposed in a two-to-two intersecting manner, and have an intersecting portion, and the shape memory layer 22 is located on the intersecting portion.
Specifically, as shown in fig. 2, the supporting layer 21 includes a first supporting rib 211 and a second supporting rib 212, where the first supporting rib 211 and the second supporting rib 212 intersect perpendicularly and are in a crisscross shape, the supporting layer 21 can be respectively bent along the first supporting rib 211 and the second supporting rib 212, the intersection of the first supporting rib 211 and the second supporting rib 212 is an intersection, and the intersection participates in bending motion during bending of the first supporting rib 211 and the second supporting rib 212, so that the fatigue life of the intersection is lower. The limitation of reducing stress of the crossing part through pattern design is larger, only the pattern with symmetrical origin can be selected, but the tensile stress generated in the bending process is far larger than that of the strip pattern used at present. In order to increase the fatigue life of the intersection, the fatigue performance of the entire support layer 21 is improved, and the shape memory material is bonded to the intersection of the support layer 21, so that the shape memory layer 22 is used to provide a prestress to the intersection, thereby improving the fatigue life of the support layer 21.
As shown in fig. 3, the present application further provides a method for preparing a flexible display module, which includes the following steps:
step S1, stretching the shape memory material in the first state to a certain deformation degree.
Specifically, the shape memory material in the first state (length a) is stretched, i.e., elongated to a certain length in the horizontal direction, and the length is determined according to the technological requirements of the actual product.
The stretching of the shape memory material is controlled by using a tool for applying deformation, and the deformation degree is determined according to the selected shape memory material and the required pre-compression force (the required pre-compression force is determined by the stacking structure and bending radius of the flexible display module). However, since the deformation amount of the shape memory alloy is low and is generally 10% or less, the tensile length thereof is not preferably more than 10% of the length thereof, and the greater the deformation degree of the shape memory material, the greater the prestress applied to the support layer.
And S2, unloading the external force, and returning the shape memory material to the second state.
Specifically, after the shape memory material is stretched to a certain length, the tooling for applying external force to the shape memory material is removed, so that the shape memory material naturally recovers to a second state (the length is b, b > a), and after the external force is removed, the shape memory material naturally contracts due to the super elasticity of the shape memory material.
Step S3 of fixing the shape memory material in the second state to one side surface of the support layer 21 to form the shape memory layer 22.
Specifically, the supporting layer 21 has a supporting layer bending area, and the shape memory material in the second state is adhered and fixed on the surface of the supporting layer bending area on one side of the supporting layer 21 by using an adhesive or welding method, so as to form the shape memory layer 22 on the surface of the supporting layer 21.
In other embodiments, the supporting layer 21 includes at least one first supporting rib 211 and at least one second supporting rib 212, the first supporting rib 211 and the second supporting rib 212 are disposed in a two-to-two intersecting manner, and have an intersecting portion, and the shape memory layer 22 is attached to the intersecting portion.
Step S4, heating the support layer 21 to which the shape memory layer 22 is attached, and recovering the shape memory material to the first state.
Specifically, the support layer 21 to which the shape memory layer 22 is attached is heated to a temperature equal to or higher than the phase transition temperature (As) of the shape memory material, so that the shape memory material returns to the first state (length a). In this process, the shape memory effect of the shape memory material is excited by the temperature rise, and the shape memory material is to be restored to the original shape due to the shape memory effect, whereby the shape memory material is subjected to restoring stress, and the support layer 21 is subjected to restoring compressive stress due to the fixation of the shape memory material to the support layer 21. Through experiments, as shown in FIG. 4, a schematic diagram of the state before and after heating is shown, wherein σ r For restoring stress, sigma, of shape memory material sc For the compressive stress of the support layer, after heating, the shape memory layer 22 shortens to return to its original length, and the support layer 21 also correspondingly contracts, i.e., it is proved that the shape memory layer 22 applies a prestress to the support layer 21.
Wherein the heating temperature is related to the withstand temperature of the flexible display panel 10, typically not exceeding 100 ℃, and the shape memory material having a suitable phase transition temperature is selected according to the withstand temperature of the flexible display panel 10 during the actual process.
Step S5, cooling is then performed to obtain the support portion 20.
Specifically, the shape memory layer 22 and the support layer 21 which are restored to the first state after being heated are cooled to room temperature, and the support portion 20 formed by the shape memory layer 22 and the support layer 21 is obtained, and the support portion 20 can be directly used for the flexible display module.
Wherein, during the process of gradually cooling to room temperature, the supporting portion 20 further contracts during the cooling process due to the thermal expansion and contraction effect, and the prestress further increases.
In step S6, a flexible display panel 10 is provided, where the flexible display panel 10 includes a bendable region.
In this embodiment, the flexible display panel 10 may be, but is not limited to, AMOLED, PMOLED, LCD. The flexible display panel 10 is bendable and has a bendable region.
In step S7, the supporting portion 20 is attached to a side of the flexible display panel 10 facing away from the light emitting side, so that the shape memory layer 22 corresponds to the bendable region.
In the present embodiment, when the support 20 is attached to the flexible display panel 10, the shape memory layer 22 is located on the side of the support layer 21 away from the flexible display panel 10. At this time, the shape memory layer 22 has little influence on the display of the flexible display module 100.
In other embodiments, the shape memory layer 22 may be located on a side of the support layer 21 near the flexible display panel 10 when the support portion 20 is attached to the flexible display panel 10.
In other embodiments, as shown in fig. 1, the steps further include: attaching a back plate layer 30 between the support part 20 and the flexible display panel 10; attaching a polarizer 40 to a side of the flexible display panel 10 away from the back plate layer 30; a glass cover plate 50 is attached to a side of the polarizer 40 away from the flexible display panel 10, and the glass cover plate 50 and the polarizer 40 are bonded through a transparent optical adhesive layer 60.
According to the support layer bending region, the shape memory material is attached to the surface of the support layer, and the support layer is heated, so that the shape memory material is prestressed to the support layer, the fatigue performance of the support layer can be effectively improved, the support part with the shape memory layer is applied to the flexible display module, and the bending performance, the fatigue performance and the service life of the flexible display module can be improved.
In other embodiments, the structures and steps are not limited to the structures and steps described above, and may be modified according to practical situations.
In summary, although the present application has been described with reference to the preferred embodiments, the preferred embodiments are not intended to limit the application, and those skilled in the art can make various modifications and adaptations without departing from the spirit and scope of the application, and the scope of the application is therefore defined by the claims.
Claims (10)
1. The preparation method of the flexible display module is characterized by comprising the following steps:
stretching the shape memory material in the first state to a certain deformation degree; unloading the external force, and returning the shape memory material to a second state; fixing a shape memory material in a second state to one side surface of the support layer to form a shape memory layer; heating the support layer attached with the shape memory layer, and recovering the shape memory material to a first state to enable the support layer to have prestress; then cooling to obtain a supporting part;
providing a flexible display panel, wherein the flexible display panel comprises a bendable region; and
And attaching the support part to one side of the flexible display panel, which is away from the light emitting side, so that the shape memory layer corresponds to the bendable region.
2. The method of claim 1, wherein the shape memory layer is attached to a side of the support layer away from the flexible display panel.
3. The method of claim 1, wherein the shape memory layer is attached to a side of the support layer near the flexible display panel.
4. The method of claim 1, wherein the supporting layer comprises at least one first supporting rib and at least one second supporting rib, the first supporting rib and the second supporting rib are disposed in a crossing manner, and have a crossing portion, and the shape memory layer is attached to the crossing portion.
5. A flexible display module, comprising:
a flexible display panel including a bendable region; and
The support part is positioned on one side of the flexible display panel, which is far away from the light emitting side, the support part comprises a support layer and a shape memory layer positioned on one side of the support layer, the support layer is provided with a support layer bending area matched with the bendable area, the shape memory layer corresponds to the support layer bending area, the shape memory layer is provided with elasticity and shape memory characteristics, the shape memory layer is attached to the surface of the support layer and enables the support layer to have prestress, and the support part is formed by adopting the preparation method as in claim 1.
6. The flexible display module according to claim 5, wherein the shape memory layer is adhered and fixed to the surface of the supporting layer by gluing or welding.
7. The flexible display module of claim 5, wherein the material of the shape memory layer is a shape memory alloy or a shape memory organic material.
8. The flexible display module of claim 5, wherein the shape memory layer is located on a side of the support layer remote from the flexible display panel.
9. The flexible display module of claim 5, wherein the shape memory layer is located on a side of the support layer adjacent to the flexible display panel.
10. The flexible display module of claim 5, wherein the supporting layer comprises at least one first supporting rib and at least one second supporting rib, the first supporting rib and the second supporting rib are disposed in a crossing manner, and have a crossing portion, and the shape memory layer is disposed on the crossing portion.
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| KR20180111281A (en) * | 2017-03-31 | 2018-10-11 | 엘지디스플레이 주식회사 | Flexible display device |
| CN109004001A (en) * | 2018-07-03 | 2018-12-14 | 武汉华星光电半导体显示技术有限公司 | A kind of bent flexible base board, display panel and display equipment |
| WO2020077524A1 (en) * | 2018-10-16 | 2020-04-23 | 深圳市柔宇科技有限公司 | Display panel and control method therefor, and display device |
| KR20210154857A (en) * | 2019-07-08 | 2021-12-21 | 엘지전자 주식회사 | mobile terminal |
| CN110387805A (en) * | 2019-08-14 | 2019-10-29 | 北京交通大学 | A kind of novel pre-stressed stayed structure based on marmem |
| CN110456441A (en) * | 2019-09-05 | 2019-11-15 | 京东方科技集团股份有限公司 | A kind of polaroid, flexible display panels, flexible display apparatus and its bending method |
| CN113409694A (en) * | 2021-06-25 | 2021-09-17 | 上海天马微电子有限公司 | Foldable display device |
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