CN111446278A - Back film layer of flexible display device and flexible display device with same - Google Patents

Back film layer of flexible display device and flexible display device with same Download PDF

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Publication number
CN111446278A
CN111446278A CN202010285761.1A CN202010285761A CN111446278A CN 111446278 A CN111446278 A CN 111446278A CN 202010285761 A CN202010285761 A CN 202010285761A CN 111446278 A CN111446278 A CN 111446278A
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China
Prior art keywords
layer
film layer
flexible display
display device
back film
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Granted
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CN202010285761.1A
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Chinese (zh)
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CN111446278B (en
Inventor
王亚明
陈立强
赵东东
李刚
石佳凡
郝帅帅
李璐
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to CN202010285761.1A priority Critical patent/CN111446278B/en
Publication of CN111446278A publication Critical patent/CN111446278A/en
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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/40—OLEDs integrated with touch screens
    • 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
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/549—Organic PV cells

Abstract

The invention discloses a back film layer of a flexible display device and the flexible display device with the back film layer. The back film layer is provided with a first surface and a second surface which are oppositely arranged, the first surface is suitable for being arranged on the device layer to protect the device layer, and the elastic modulus of at least one part of the back film layer in the bendable region is smaller than that of the back film layer in the non-bendable region. According to the back film layer, the back film layer is arranged on the device layer, so that the effects of isolating water and oxygen and protecting the device layer are achieved. Meanwhile, when the flexible display device is bent, the elastic modulus of at least one part of the back film layer in the bendable region is reduced, so that the stress on the device layer is reduced, and the device layer is prevented from being damaged.

Description

Back film layer of flexible display device and flexible display device with same
Technical Field
The invention relates to the field of display, in particular to a back film layer of a flexible display device and the flexible display device with the back film layer.
Background
However, the O L ED flexible display screen is easily corroded by water and oxygen, which causes pixel damage and shortens the service life of the device, and when the O L ED flexible display screen is bent, the device is subjected to a large stress, which causes damage of the device.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art.
Therefore, the invention provides a back film layer of a flexible display device to reduce stress on a device layer when the flexible display device is bent.
The invention also provides a flexible display device with the back film layer.
According to the embodiment of the invention, the flexible display device is provided with a bendable region and a non-bendable region, the flexible display device comprises a device layer, the back film layer is provided with a first surface and a second surface which are oppositely arranged, the first surface is suitable for being arranged on the device layer to protect the device layer, and the elastic modulus of at least one part of the back film layer in the bendable region is smaller than that of the back film layer in the non-bendable region.
According to the back film layer of the flexible display device, the back film layer is arranged on the device layer, so that the effects of isolating water and oxygen and protecting the device layer are achieved. Meanwhile, when the flexible display device is bent, the elastic modulus of at least one part of the back film layer in the bendable region is reduced, so that the stress on the device layer is reduced, and the device layer is prevented from being damaged.
In some embodiments of the invention, the thickness of the back film layer in at least a portion of the bendable region is less than the thickness of the back film layer in the non-bendable region.
In some embodiments of the present invention, in the bendable region, the second surface of the back film layer is provided with a recess recessed toward the first surface.
In some embodiments of the present invention, the flexible display device is bent along a bending axis, and an extending direction of the recess is parallel to an extending direction of the bending axis.
In some embodiments of the present invention, the backside film layer is spaced apart from the backside film layer by a plurality of the recesses.
In some embodiments of the present invention, the recess is a plurality of blind holes spaced on the backside film layer.
In some embodiments of the invention, the inner side wall of the recess is formed as an obliquely extending transition surface.
In some embodiments of the present invention, the recess is filled with a filler.
In some embodiments of the present invention, the backside film layer includes a base layer and a glue layer disposed between the base layer and the device layer to adhere the base layer to the device layer, and the recess is disposed in the base layer.
The flexible display device according to an embodiment of the present invention includes: a backside film layer according to the above embodiments of the present invention, and a device layer disposed on the first surface.
According to the flexible display device provided by the embodiment of the invention, the back film layer is arranged on the device layer, so that the effects of isolating water and oxygen and protecting the device layer are achieved. Meanwhile, when the flexible display device is bent, the elastic modulus of at least one part of the back film layer in the bendable region is reduced, so that the stress on the device layer is reduced, and the device layer is prevented from being damaged.
In some embodiments of the present invention, the flexible display device further comprises a substrate for maintaining an elastic restoring force of the flexible display device, the substrate being attached to the second surface.
In some embodiments of the present invention, the device layer includes a flexible substrate, a metal routing layer, and an encapsulation layer, which are sequentially disposed, and the flexible substrate is connected to the back film layer.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a cross-sectional view of a flexible display device according to an embodiment of the present invention;
FIG. 2 is a schematic view of a flexible display device according to some embodiments of the present invention;
FIG. 3 is a schematic view of a flexible display device according to further embodiments of the present invention;
fig. 4-8 are schematic views of a backside film layer according to various embodiments of the invention;
FIGS. 9-12 are cross-sectional views of the backside film layer at A-A of FIG. 8 according to various embodiments of the present invention;
FIG. 13 is a partial cross-sectional view of a back film layer according to an embodiment of the invention;
FIG. 14 is a schematic diagram of a device layer according to an embodiment of the invention;
FIG. 15 is a process flow diagram of a backside film layer in accordance with an embodiment of the present invention;
FIG. 16 is a schematic view of a flexible display device according to some embodiments of the present invention in a flexed state;
FIG. 17 is a schematic view of a flexible display device according to further embodiments of the present invention in a flexed state;
FIGS. 18 and 19 are line graphs of stress experienced by a device layer as a function of thickness of a backside film layer according to embodiments of the present invention;
FIG. 20 is a table of data showing the stress experienced by a device layer as a function of thickness of a backside film layer in accordance with an embodiment of the present invention;
FIG. 21 is a line graph of the modulus of elasticity of a backing film layer as a function of thickness of the backing film layer according to an embodiment of the present invention.
Reference numerals:
100. a flexible display device;
1. a back film layer; 11. a recessed portion; 111. blind holes; 112. a transition surface; 12. a base layer; 13. a glue layer;
2. a device layer; 21. a flexible substrate; 22. a metal routing layer; 23. a packaging layer;
3. a polarizing layer;
4. a touch layer;
5. an insulating protective layer;
6. bending the axis;
7. a non-bendable region;
8. a bendable region.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The back film layer 1 of the flexible display device 100 according to an embodiment of the invention is described below with reference to fig. 1-21, the flexible display device 100 having a bendable region 8 and a non-bendable region 7, the flexible display device 100 comprising a device layer 2. It will be appreciated that the flexible display device 100 achieves the purpose of displaying an image by the light emission of the device layer 2.
In some embodiments of the present invention, as shown in fig. 2 to 8, the bendable region 8 may be located at the middle, the side, or around the non-bendable region 8 of the flexible display device 100, so that the flexible display device 100 can be bent at the bendable region 8. The position of the bendable region 8 on the flexible display device 100 may be limited according to actual use, as long as the flexible display device 100 can be bent at the bendable region 8, and the position of the bendable region 8 is not limited herein.
According to the back film layer 1 of the flexible display device 100 of the embodiment of the invention, the back film layer 1 has a first surface and a second surface which are oppositely arranged, the first surface is suitable for being arranged on the device layer 2 to protect the device layer 2, and the elastic modulus of at least one part of the back film layer 1 in the bendable region 8 is smaller than that of the back film layer 1 in the non-bendable region 7.
It should be noted that the elastic modulus of the back film layer 1 in the bendable region 8 can be changed, and the elastic modulus of the other part of the back film layer 1 in the bendable region 8 can be kept unchanged, or the elastic modulus of the whole back film layer 1 in the bendable region 8 can be changed, so that the elastic modulus of the back film layer 1 in the bendable region 8 can be smaller than the elastic modulus of the back film layer 1 in the non-bendable region 7.
It can be understood that, through making the back rete 1 set up on device layer 2 to reach isolated water oxygen, protect the effect of device layer 2, to avoid device layer 2 to receive the erosion of water and oxygen to lead to the pixel impaired, and then improve the life of device layer 2.
Meanwhile, the elastic modulus of at least one part of the back film layer 1 in the bendable region 8 is smaller than that of the back film layer 1 in the non-bendable region 7, so that on one hand, the strength of the part of the back film layer 1 in the non-bendable region 7 can be ensured, the device layer 2 is better protected, and the device layer 2 is prevented from being corroded by water and oxygen. On the other hand, when the flexible display device 100 is bent, the elastic modulus of at least a portion of the backside film layer 1 in the bendable region 8 is lowered, so that the stress applied to the device layer 2 is reduced to avoid the damage of the device layer 2.
The elastic modulus is a stress required for the material to elastically deform per unit under an external force. The elastic modulus value is larger, the stress of the material for certain elastic deformation is larger, namely the rigidity of the material is larger, namely the elastic deformation is smaller under the action of certain stress, and further after the elastic modulus of the back film layer 1 is reduced, the stress required by the flexible display device 100 when the flexible display device 100 is bent is correspondingly reduced, so that the stress borne by the device layer 2 is reduced, and the damage of the device layer 2 is avoided. Meanwhile, the bending radius of the flexible display device 100 can be made smaller, and the user experience is improved.
In some embodiments of the present invention, the material of at least a portion of the backside film layer 1 in the bendable region 8 may be changed to change the elastic modulus of the portion of the backside film layer 1, so that the portion of the backside film layer 1 is relatively flexible, so that the stress on the device layer 2 is reduced when the flexible display apparatus 100 is bent, and the device layer 2 is prevented from being damaged.
As shown in fig. 14, in some embodiments of the present invention, the device layer 2 includes a flexible base layer 12(PI), a metal wiring layer 22(BP + E L), and an encapsulation layer 23(TFE), which are sequentially disposed, the flexible base layer 12 is connected to the first surface of the back film layer 1, a wiring structure of the flexible display device 100 is disposed in the metal wiring layer 22, and the device layer 2 emits light through the encapsulation layer 23 to display an image.
Furthermore, when the flexible display device 100 is bent, the elastic modulus of at least a portion of the back film layer 1 in the bendable region 8 is reduced, so that the stress applied to the device layer 2 is reduced, and therefore, on one hand, the phenomenon of disconnection of the circuit structure in the metal wiring layer 22 after the flexible display device 100 is bent for multiple times can be avoided. On the other hand, when the flexible display device 100 is bent, the tensile force or the extrusion force applied to the encapsulation layer 23 of the device layer 2 can be reduced to ensure that the encapsulation layer 23 is not damaged or broken, so that the damage to the device layer 2 can be avoided, and the service life of the device layer 2 can be prolonged.
According to the back film layer 1 of the flexible display device 100 of the embodiment of the invention, the back film layer 1 is arranged on the device layer 2, so that the effects of isolating water and oxygen and protecting the device layer 2 are achieved. Meanwhile, when the flexible display device 100 is bent, the elastic modulus of at least a portion of the back film layer 1 in the bendable region 8 is lowered, so that the stress applied to the device layer 2 is reduced to prevent the device layer 2 from being damaged.
As shown in fig. 3-17, in some embodiments of the present invention, the thickness of the backsheet 1 in at least a portion of the bendable region 8 is less than the thickness of the backsheet 1 in the non-bendable region. It will be appreciated that by reducing the thickness of at least a portion of the backing film layer 1 within the bendable region 8, thereby reducing the modulus of elasticity of that portion of the backing film layer 1, to reduce the stress required when the flexible display device 100 is bent, the stress experienced by the device layer 2 is reduced, thereby avoiding damage to the device layer 2.
It should be noted that, when the thickness of the back film layer 1 is reduced, the position of the neutral layer of the device layer 2 is also shifted toward a direction away from the back film layer 1, and since the metal routing layer 22 and the encapsulation layer 23 of the device layer 2 are farther from the back film layer 1, so that the neutral layer of the device layer 2 is moved toward a direction close to the encapsulation layer 23, when the flexible display device 100 is bent, the stress applied to the metal routing layer 22 and the encapsulation layer 23 is also reduced, thereby preventing the device layer 2 from being damaged.
Wherein a neutral layer is to be understood; during the bending process, one side of the material is subjected to tensile force, the other side of the material is subjected to compressive force, a transition layer which is not subjected to tension and compression is inevitably generated on the section of the material, the stress applied to the transition layer is almost equal to zero, and the tensile force and the compressive force applied to the transition layer are smaller when the transition layer is closer to the transition layer, and the transition layer is called a neutral layer of the material.
For example, when the flexible display device 100 is bent outward, the encapsulation layer 23 of the device layer 2 is subjected to a tensile force while the flexible base layer 12 is subjected to a compressive force, and when the flexible display device 100 is bent inward, the encapsulation layer 23 of the device layer 2 is subjected to a compressive force while the flexible base layer 12 is subjected to a tensile force while being bent away from the backing film layer 1. Furthermore, when the neutral layer of the device layer 2 is shifted away from the backside film layer 1, i.e. the neutral layer of the device layer 2 moves towards the direction close to the encapsulation layer 23, the stress on the metal routing layer 22 and the encapsulation layer 23 when the flexible display device 100 is bent is relatively reduced, so as to avoid the damage of the device layer 2.
As shown in FIG. 21, in some embodiments of the invention, the back film layer within the bendable region 8The elastic modulus of 1 is y, the thickness of the back film layer 1 in the bendable region 8 is H, and y is less than or equal to 0.0236H3-2.1284H252.028H +7159, the elastic modulus of the backsheet 1 in the foldable region 8 can be calculated based on the change in the thickness of the backsheet 1 in the foldable region 8, so as to control the elastic modulus of the backsheet 1 in the foldable region 8.
As shown in fig. 16 to 20, based on this, the invention has performed an experiment that the flexible display device 100 is bent outward by 90 °, and it can be seen from fig. 20 that the stress applied to the device layer 2 changes with the thickness change of the back film layer 1, when the thickness of the back film layer 1 is not changed, the maximum tensile strain applied to the encapsulation layer 23 and the metal routing layer 22 is 4.65% o and 2.36% o, respectively, the maximum tensile strain applied to the encapsulation layer 23 and the metal routing layer 22 is gradually reduced with the reduction of the thickness of the back film layer 1 by the encapsulation layer 23, and when the thickness of the back film layer 1 is reduced from 75um to 25um, the neutral layer of the device layer 2 is located in the metal routing layer 22, and at this time, the tensile stress applied to the metal routing layer 22 is smaller, and the tensile strain applied to the encapsulation layer 23 is also reduced by about 44%. When the elastic modulus of the back film layer 1 is reduced from 5400MPa to 1000MPa, the neutral layer of the device layer 2 is also located in the metal wiring layer 22, and at this time, the tensile stress applied to the metal wiring layer 22 is small, and the tensile strain applied to the packaging layer 23 is reduced by about 50.5%.
When the thickness and the elastic modulus of the back film layer 1 in the bendable region 8 satisfy the formula: y is less than or equal to 0.0236H3-2.1284H252.028H +7159, and when H is greater than or equal to 10um and less than or equal to 75um, the neutral layer of the device layer 2 is located in the metal wiring layer 22 or the encapsulation layer 23, so that the neutral layer of the device layer 2 can be moved by reducing the thickness and the elastic modulus of the back film layer 1 in the bendable region 8, so that the neutral layer of the device layer 2 is closer to the encapsulation layer 23 and the metal wiring layer 22, the stress and the strain of the encapsulation layer 23 and the metal wiring layer 22 can be effectively reduced, and the risk of the flexible display device 100 breaking when being bent is reduced.
As shown in fig. 3 to 17, in some embodiments of the present invention, in the bendable region 8, the second surface of the back film layer 1 is provided with a recess 11 recessed toward the first surface. It can be understood that, by providing the recessed portion 11 on the back film layer 1, the thickness of the back film layer 1 in the bendable region 8 is reduced, so as to reduce the elastic modulus of the back film layer 1 in the bendable region 8, and further, when the flexible display device 100 is bent, since the elastic modulus of the back film layer 1 in the bendable region 8 is reduced, the stress applied to the device layer 2 is reduced, so as to avoid the damage to the device layer 2.
Simultaneously, because this depressed part 11 is the second surface of back rete 1 and caves in towards the first surface of back rete 1, and then does not change the structure of the first surface of back rete 1 to guarantee that the first surface of back rete 1 and device layer 2's cooperation is steady reliable, thereby back rete 1 can protect device layer 2 better, avoids device layer 2 to receive the erosion of water oxygen.
In some embodiments of the present invention, the thickness of the backside film layer 1 may be 75um, wherein the depth of the recess 11 is at least 55um, so as to reduce the elastic modulus of the backside film layer 1 in the bendable region 8, such that the stress on the device layer 2 is reduced to avoid the damage of the device layer 2. The depth of the recess 11 may be limited according to actual use, and when the flexible display device 100 is bent, the stress applied to the device layer 2 may be reduced, and the depth of the recess 11 is not limited herein.
In some embodiments of the present invention, in the bendable region 8, the second surface of the back film layer 1 is recessed toward the first surface, so that the recessed portion 11 is substantially formed as a groove disposed on the back film layer 1, thereby reducing the thickness of the back film layer 1 entirely in the bendable region 8, so as to reduce the elastic modulus of the back film layer 1 in the bendable region 8, and further reducing the stress applied to the device layer 2 when the flexible display device 100 is bent, so as to avoid the device layer 2 from being damaged due to the reduced elastic modulus of the back film layer 1 in the bendable region 8.
As shown in fig. 4 and 16, in some embodiments of the present invention, the backside film layer 1 is provided with a plurality of recesses 11 at intervals. It can be understood that, as shown in fig. 7, in the bendable region 8, the back film layer 1 is provided with a plurality of recesses 11 at intervals, so as to reduce the thickness of the back film layer 1 partially in the bendable region 8, so as to reduce the elastic modulus of the back film layer 1 partially in the bendable region 8, and further, when the flexible display device 100 is bent, since the elastic modulus of at least a part of the back film layer 1 in the bendable region 8 is reduced, the stress applied to the device layer 2 is reduced, so as to avoid the damage of the device layer 2.
In some embodiments of the present invention, the shape of the recess 11 may be U-shaped, semicircular, V-shaped, trapezoidal, or the like. The shape of the recess 11 may be limited according to actual use, as long as the thickness of at least a part of the back film layer 1 in the bendable region 8 can be reduced to lower the elastic modulus of the back film layer 1 in the bendable region 8, and the shape of the recess 11 is not limited herein.
As shown in fig. 4, 7 and 8, in some embodiments of the present invention, the flexible display device 100 is bent along the bending axis 6, and the extending direction of the recess 11 is parallel to the extending direction of the bending axis 6. It can be understood that, in the length direction of the concave portion 11, the extending direction of the concave portion 11 is parallel to the axial direction of the bending axis 6, so as to reduce the elastic modulus of the flexible display device 100 at the concave portion 11 when bending occurs, thereby reducing the stress to which the device layer 2 is subjected to avoid the damage of the device layer 2.
As shown in fig. 8 to 12, in some embodiments of the present invention, the recess 11 is a plurality of blind holes 111 spaced apart from each other on the backside film layer 1. It can be understood that the recessed portion 11 may be a plurality of blind holes 111 disposed at intervals on the back film layer 1, so as to reduce the thickness of at least a portion of the back film layer 1 in the bendable region 8, so as to reduce the elastic modulus of the back film layer 1 in the bendable region 8, and further when the flexible display device 100 is bent, since the elastic modulus of the back film layer 1 in the bendable region 8 is reduced, the stress on the device layer 2 is reduced, so as to avoid the damage to the device layer 2.
As shown in fig. 8-12, in some embodiments of the invention, the blind hole 111 may be U-shaped, semi-circular, V-shaped, trapezoidal, or the like. The shape of the blind hole 111 may be defined according to actual use conditions, as long as the thickness of at least a part of the back film layer 1 in the bendable region 8 can be reduced to reduce the elastic modulus of the back film layer 1 in the bendable region 8, and the shape of the blind hole 111 is not limited herein.
In some embodiments of the present invention, at least one blind hole 111 is formed on the side of the backside film layer 1 away from the device layer 2, when the number of the blind holes 111 is small, the process may be a grinding process, and when the number of the blind holes 111 is large, a photolithography process may be used to facilitate processing of the blind holes 111.
In some embodiments of the present invention, at least one recessed portion 11 parallel to the extending direction of the bending axis 6 is formed on the side of the backside film layer 1 away from the device layer 2, when the number of the recessed portions 11 is small, the process may be a pin grinding process or a layer-by-layer scraping process, and when the number of the recessed portions 11 is large, a photolithography process or a laser etching process may be used to facilitate the processing of the recessed portions 11.
In some embodiments of the present invention, when the thickness of the back film layer 1 is reduced on the side of the back film layer 1 away from the device layer 2, a pin grinding process, a layer-by-layer scraping process, a photolithography process, a laser etching process, or the like may be adopted, so as to facilitate the reduction of the thickness of the back film layer 1. The photolithography process is to remove the unwanted back film layer 1 by coating, exposing, developing and etching processes.
As shown in fig. 13, in some embodiments of the invention, the inner side wall of the recess 11 is formed as a transition surface 112 extending obliquely. It can be understood that, by making the inner side wall of the recess 11 be disposed obliquely to form the transition surface 112, the strength of the back film layer 1 at the transition surface 112 is ensured, and the phenomenon that the back film layer 1 is broken after the flexible display device 100 is bent for multiple times is avoided. Preferably, the inclined extension of the transition surface 112 may be curved, dog-leg or circular. The inclined extending locus of the transition surface 112 may be defined according to the actual use situation, as long as the transition surface 112 is inclined and extended, and is not limited herein.
In some embodiments of the present invention, the recess 11 is filled with a filler. It will be appreciated that the recess 11 may be filled with a filler to ensure flatness of the backing film 1. Preferably, the filler may be a soft glue, such as UV glue, etc., to improve surface flatness and to improve the curved surface attachment effect.
As shown in fig. 15, in some embodiments of the present invention, the backing film layer 1 includes a base layer 12 and a glue layer 13, the glue layer 13 being disposed between the base layer 12 and the device layer 2 to adhere the base layer 12 to the device layer 2, and the recesses 11 being disposed in the base layer 12. It can be understood that the base layer 12 is adhered to the device layer 2 through the adhesive layer 13, so that the connection structure between the back film layer 1 and the device layer 2 is simple and reliable. While the depressions 11 are provided in the base layer 12 to ensure the structural strength of the back film layer 1.
As shown in fig. 1 to 21, the flexible display device 100 according to the embodiment of the present invention includes: a backside film layer 1 and a device layer 2, the backside film layer 1 being the backside film layer 1 according to the above-described embodiment of the present invention, the device layer 2 being provided on the first surface.
According to the back film layer 1 of the flexible display device 100 of the embodiment of the invention, the back film layer 1 is arranged on the device layer 2, so that the effects of isolating water and oxygen and protecting the device layer 2 are achieved. Meanwhile, when the flexible display device 100 is bent, the elastic modulus of at least a portion of the back film layer 1 in the bendable region 8 is lowered, so that the stress applied to the device layer 2 is reduced to prevent the device layer 2 from being damaged.
In some embodiments of the present invention, the flexible display device 100 further comprises a substrate for maintaining an elastic restoring force of the flexible display device 100, the substrate being attached to the second surface. It is understood that the resilience of the flexible display device 100 is ensured by providing a substrate on the second surface of the back film layer 1 to ensure the elastic restoring force of the flexible display device 100 after the flexible display device 100 is bent. Preferably, the substrate may be a steel plate, thereby securing an elastic restoring force of the flexible display device 100.
As shown in fig. 1 to 3, 16 and 17, in some embodiments of the present invention, the flexible display device 100 further includes a functional layer, which may include an insulating protective layer 5(Cover film), a TOUCH layer 4(TOUCH), and a polarizing layer 3(PO L), which are sequentially disposed, wherein the polarizing layer 3 is connected to the device layer 2 of the device layer 2, the insulating protective layer 5 may be a protective film to perform an insulating protection function on the flexible display device 100, the TOUCH layer 4 may receive a TOUCH signal, and when a user lightly touches an icon or a character on the flexible display device 100 with a finger, human-computer interaction may be achieved, so that the flexible display device 100 is more intelligent, and the polarizing layer 3 is made according to a polarization principle of light, so that a glare function may be effectively eliminated, and an experience of the user viewing the flexible display device 100 may be improved.
In some embodiments of the invention, the polarizing layer 3 of functional layers may also be located between the touch layer 4 and the insulating protective layer 5 to connect the touch layer 4 to the device layer 2. It should be noted that the form of the functional layer may be limited according to the actual use condition as long as the actual use requirement of the flexible display device 100 is met, and the form of the functional layer is not limited herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (12)

1. A back film layer of a flexible display device, wherein the flexible display device has a bendable region and a non-bendable region, the flexible display device comprises a device layer, the back film layer has a first surface and a second surface which are oppositely arranged, the first surface is suitable for being arranged on the device layer to protect the device layer, and the elastic modulus of at least one part of the back film layer in the bendable region is smaller than that of the back film layer in the non-bendable region.
2. The backsheet film layer of a flexible display device of claim 1, wherein a thickness of said backsheet film layer in at least a portion of said bendable region is less than a thickness of said backsheet film layer in said non-bendable region.
3. The backsheet film of a flexible display device of claim 1, wherein said second surface of said backsheet film is provided with a depression towards said first surface in said bendable region.
4. The backsheet layer of a flexible display device according to claim 3, wherein said flexible display device is bent along a bending axis, and wherein said recess extends in a direction parallel to said bending axis.
5. The back film layer of a flexible display device of claim 4, wherein a plurality of said recesses are spaced apart on said back film layer.
6. The backing film layer of a flexible display device of claim 3, wherein the recess is a plurality of blind holes spaced apart on the backing film layer.
7. The backsheet layer of a flexible display device according to claim 3, wherein the inner side walls of said recesses are formed as obliquely extending transition surfaces.
8. The backing film layer for a flexible display device according to claim 3, wherein the recess is filled with a filler.
9. A back film layer for a flexible display device according to any of claims 3-8, wherein the back film layer comprises a base layer and a glue layer arranged between the base layer and the device layer to adhere the base layer to the device layer, the recesses being arranged in the base layer.
10. A flexible display device, comprising:
a back film layer, the back film layer being the back film layer according to any one of claims 1 to 9;
a device layer disposed on the first surface.
11. The flexible display device according to claim 10, further comprising a substrate for maintaining an elastic restoring force of the flexible display device, the substrate being attached to the second surface.
12. The flexible display device of claim 10, wherein the device layer comprises a flexible substrate, a metal routing layer, and an encapsulation layer in the stated order, and the flexible substrate is connected to the back film layer.
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