CN114695789A

CN114695789A - Flexible display panel, preparation method thereof and display device

Info

Publication number: CN114695789A
Application number: CN202210202371.2A
Authority: CN
Inventors: 宋媛媛; 覃事建
Original assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Current assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co Ltd
Priority date: 2022-03-03
Filing date: 2022-03-03
Publication date: 2022-07-01

Abstract

The application provides a flexible display panel, a preparation method thereof and a display device, wherein the flexible display panel comprises a flexible substrate base plate; the OLED device layer is arranged on the flexible substrate base plate; the flexible cover plate assembly is arranged on one side, away from the flexible substrate, of the OLED device layer and is provided with a groove; the first packaging structure is arranged on the periphery of the OLED device layer and connected with the flexible substrate base plate, at least part of the first packaging structure is arranged in the groove, and the first packaging structure can prevent moisture from entering the OLED device layer. The flexible display panel has a moisture barrier capability.

Description

Flexible display panel, preparation method thereof and display device

Technical Field

The invention relates to the technical field of display, in particular to a flexible display panel, a preparation method of the flexible display panel and a display device.

Background

The organic light emitting diode display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, flexible display, large-area full color display and the like, and is considered as the display device with the most development potential in the industry.

The organic light emitting diode display device comprises an OLED device layer, wherein the OLED device layer is a main functional layer. The OLED device layer at least comprises a light emitting layer and a cathode layer, wherein the material of the light emitting layer is usually a polymer or an organic small molecule, and the material of the cathode layer is usually an active metal with a low work function, such as magnesium aluminum. The moisture deactivates the material of the light-emitting layer as well as the material of the cathode. If the OLED device layer is penetrated by moisture, the lifetime of the OLED device layer is greatly reduced.

Therefore, how to effectively isolate moisture is a problem to be solved in the preparation of the organic light emitting diode display device.

Disclosure of Invention

The embodiment of the application provides a flexible display panel, a preparation method thereof and a display device.

The embodiment of the application provides a flexible display panel, includes:

a flexible substrate base plate;

the OLED device layer is arranged on the flexible substrate base plate;

the flexible cover plate assembly is arranged on one side, away from the flexible substrate, of the OLED device layer, and is provided with a groove;

the packaging structure comprises a first packaging structure, wherein the first packaging structure is arranged on the peripheral side of the OLED device layer, the first packaging structure is connected with the flexible substrate base plate, at least part of the structure of the first packaging structure is arranged in the groove, and the first packaging structure can block moisture from entering the OLED device layer.

In some embodiments, the material of the first encapsulation structure is a hydrophobic material.

In some embodiments, the flexible cover plate assembly includes a second package structure and a colloid layer attached to the second package structure, the colloid layer is connected to the OLED device layer, the colloid layer is provided with the groove, and the groove is disposed corresponding to the first package structure.

In some embodiments, the depth of the groove is equal to the thickness of the colloidal layer, such that the groove penetrates the colloidal layer.

In some embodiments, the width of the groove is 1 millimeter.

In some embodiments, the flexible cover sheet assembly includes a display area and a non-display area disposed around the display area, the OLED device layer is disposed in the display area, the groove is disposed in the non-display area, the groove is annular in shape and a notch of the groove extends around the display area.

In some embodiments, the groove comprises a plurality of sub-groove segments, and the notch of each sub-groove segment extends in an arc shape or a zigzag shape.

The embodiment of the present application further provides a method for manufacturing a flexible display panel, including:

providing a flexible substrate base plate, and forming an OLED device layer on the flexible substrate base plate;

providing a flexible cover plate component, and forming a groove on the flexible cover plate component;

providing a first packaging structure, and partially filling the first packaging structure into the groove;

and relatively attaching the flexible substrate base plate and the flexible cover plate assembly, so that the first packaging structure is arranged on the peripheral side of the OLED device layer and is connected with the flexible substrate base plate.

In some embodiments, the flexible cover plate assembly includes a second package structure and a glue layer attached to the second package structure, the forming of the groove on the flexible cover plate assembly includes:

coating colloid on the second packaging structure, and performing thermosetting treatment on the colloid to form the colloid layer;

and locally etching the colloid layer to form the groove.

The embodiment of the application also provides a display device which comprises the flexible display panel.

The flexible display panel that this application embodiment provided, this flexible display panel includes flexible substrate base plate, OLED device layer, flexible apron subassembly and first packaging structure, this OLED device layer and first packaging structure set up between flexible substrate base plate and flexible apron subassembly, first packaging structure sets up in the week side on OLED device layer, this first packaging structure's partial structure sets up in the recess of flexible apron subassembly, this first packaging structure can block moisture entering OLED device layer. It can be understood that the groove of the flexible cover plate assembly enables the first packaging structure and the flexible cover plate assembly to have a larger contact area, so that the first packaging structure is not easy to fall off, and the first packaging structure is more favorable for blocking moisture from entering the OLED device layer.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

Fig. 1 is a schematic cross-sectional view of a flexible display panel according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural diagram of a first flexible cover assembly according to an embodiment of the present disclosure.

Fig. 3 is a schematic cross-sectional view of a second cross-sectional structure of a flexible display panel according to an embodiment of the present application.

Fig. 4 is a schematic structural diagram of a second structure of a flexible cover assembly according to an embodiment of the present application.

Fig. 5 is a schematic structural diagram of a third flexible cover assembly provided in an embodiment of the present application.

Fig. 6 is a schematic cross-sectional view of a third flexible display panel according to an embodiment of the present disclosure.

Fig. 7 is a schematic flowchart of a manufacturing method of a flexible display panel according to an embodiment of the present disclosure.

Fig. 8 is a schematic process flow diagram of a flexible display panel according to an embodiment of the present disclosure.

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 is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The organic light emitting diode display device has many advantages of self-luminescence, low driving voltage, high luminous efficiency, short response time, high definition and contrast, flexible display, large-area full color display, and the like, and is considered as a display device with the most development potential in the industry.

In the related art, the techniques for isolating moisture from the OLED device layer include: (1) cover plate packaging technology: coating frame glue capable of being cured by ultraviolet rays or coating the frame glue and filling a drying agent on the packaging glass/metal to ensure that the frame glue provides a relatively closed environment for the OLED device after being cured, thereby isolating the moisture from entering; (2) the laser packaging technology comprises the following steps: coating glass cement on the packaging glass, volatilizing a solvent to form glass powder, and melting the glass powder by using laser to realize adhesion after the OLED substrate and the packaging cover plate are combined. However, in the above-described technology, there is still a case where moisture intrudes from the bonding interface to the OLED device layer.

In view of the above situation, embodiments of the present application provide a flexible display panel, a manufacturing method thereof, and a display device, where the flexible display panel has a moisture blocking capability. The following detailed description is made with reference to the accompanying drawings.

Referring to fig. 1, fig. 1 is a schematic cross-sectional view of a flexible display panel according to an embodiment of the present disclosure.

The flexible display panel 10 includes a flexible substrate 11, an OLED device layer 12, a flexible cover plate assembly 13, and a first encapsulation structure 14. The flexible substrate, the OLED device layer 12 and the flexible cover plate assembly 13 are sequentially stacked. The OLED device layer 12 is disposed on the flexible substrate 11, the flexible cover plate is disposed on a side of the OLED device layer 12 away from the flexible substrate 11, and the flexible cover plate assembly 13 is disposed with a groove 131. The first encapsulation structure 14 is disposed on the periphery of the OLED device layer 12 and connected to the flexible substrate 11, at least a part of the first encapsulation structure 14 is disposed in the groove 131, and the first encapsulation structure 14 can block moisture from entering the OLED device layer 12.

Wherein, since the flexible display panel 10 is stretchable, foldable, bendable, or rollable, the flexible substrate base 11 is also stretchable, foldable, bendable, or rollable. The flexible substrate 11 may be formed of any suitable insulating material having flexibility. The flexible substrate 11 may be an organic polymer or an organic-inorganic doped composite. For example, the organic polymer may be Polyimide (PI) or polyethylene terephthalate (PET), etc.; the inorganic-organic doped composite can be formed by doping glass fiber in polyimide, which is an organic polymer, and the glass fiber has higher toughness, so that the flexible strength of the flexible substrate 11 can be remarkably improved, the flexible substrate is not easy to break and peel when being bent, and the service life of the flexible substrate 11 can be effectively prolonged. The main method for manufacturing the flexible substrate 11 is to form the flexible substrate 11 on a carrier substrate (e.g. a high temperature resistant glass substrate), where one side of the flexible substrate 11 adjacent to the carrier substrate is generally called a bottom side and the opposite side is generally called a top side. Then, electronic devices (such as thin film transistors, resistors, capacitors, and the like) are formed on the top surface of the flexible substrate 11, and other steps of manufacturing the flexible display panel 10 are performed, and finally, the flexible panel is peeled off from the carrier substrate.

Among them, the OLED device layer 12 serves as a functional layer of the flexible display panel 10, and the functional layer plays an important role of emitting light and is a core layer of the flexible display panel 10. The OLED device layer 12 generally includes: an anode, a hole injection layer, a hole transport layer, a luminescent layer, an electron transport layer, an electron injection layer and a cathode. The light emitting principle of the OLED device layer 12 is that semiconductor materials and organic light emitting materials emit light by carrier injection and recombination under the driving of an electric field. Specifically, the OLED device layer 12 generally uses an indium tin oxide electrode and a metal electrode as an anode and a cathode of the device, respectively, and under a certain voltage, electrons and holes are injected into the electron transport layer and the hole transport layer from the cathode and the anode, respectively, and the electrons and the holes migrate to the light emitting layer through the electron transport layer and the hole transport layer, respectively, and meet at the light emitting layer to form excitons and excite light emitting molecules, which emit visible light through radiative relaxation.

Referring to fig. 1 and fig. 2, fig. 2 is a schematic view illustrating a first structure of a flexible cover assembly according to an embodiment of the present disclosure.

The flexible cover plate assembly 13 has a sealing effect, and can block moisture from entering the OLED device layer 12. The flexible cover assembly 13 is disposed opposite to the flexible substrate 11, and in terms of the display device, the flexible cover assembly 13 is divided into a display area 134 and a non-display area 135 disposed around the display area 134. The groove 131 is disposed in the non-display area 135, and the groove 131 may be only a discontinuous groove segment, or the groove 131 disposed around the display area 134, or may include a plurality of discontinuous sub-groove segments, or a plurality of continuous sub-groove segments with different groove wall areas.

It can be understood that, by providing the groove 131 on the flexible cover assembly 13, the first packaging structure 14 is at least partially disposed in the groove 131 to increase the contact area between the first packaging structure 14 and the flexible cover assembly 13, so that the first packaging structure 14 is not only disposed between the flexible substrate 11 and the flexible cover assembly 13, but also can extend into the groove 131 of the flexible substrate 11. The first package structure 14 not only can support the flexible substrate 11 and the flexible cover plate assembly 13, but also can form a sealed cavity together with the flexible substrate 11 and the flexible cover plate assembly 13, so that the first package structure has better sealing performance. For example, if moisture invades the OLED device layer 12, the moisture needs to enter the groove 131, and then diffuse into the gap between the flexible cover plate assembly 13 and the first encapsulation structure 14, and finally enter the OLED device layer 12. Therefore, moisture entering the OLED device layer 12 is more difficult than the prior art, i.e., the flexible display panel 10 in the embodiment of the present application can isolate moisture well.

The embodiment of the application provides a flexible display panel 10, this flexible display panel 10 includes flexible substrate base plate 11, OLED device layer 12, flexible apron subassembly 13 and first packaging structure 14, this OLED device layer 12 and first packaging structure 14 set up between flexible substrate base plate 11 and flexible apron subassembly 13, and first packaging structure 14 sets up in the week side of OLED device layer 12, this first packaging structure 14's partial structure sets up in the recess 131 of flexible apron subassembly 13, this first packaging structure 14 can block moisture entering OLED device layer 12. It can be understood that the groove 131 of the flexible cover plate assembly 13 enables the first encapsulation structure 14 and the flexible cover plate assembly 13 to have a larger contact area, so that the first encapsulation structure 14 is not easy to fall off, and it is more favorable for the first encapsulation structure 14 to block moisture from entering the OLED device layer 12.

In some cases, the material forming the first encapsulation structure 14 can absorb moisture to prevent moisture from entering the OLED device layer 12, and in such cases, the moisture absorption performance of the material forming the first encapsulation structure 14 can be generally divided into two types, i.e., chemisorbed moisture and physisorbed moisture. For example, when the first encapsulation structure 14 functions by chemically adsorbing moisture, the material constituting the first encapsulation structure 14 may be phosphorus pentoxide, and when the first encapsulation structure 14 functions by physically adsorbing moisture, the material constituting the first encapsulation structure 14 may be molecular sieve, polyvinyl alcohol, or sodium polyacrylate.

In other cases, the first encapsulation structure 14 is made of a material that blocks moisture to prevent moisture from entering the OLED device layer 12. In this case, the material forming the first package structure 14 is a hydrophobic material. The hydrophobic material can be colloidal materials such as epoxy doped inorganic particle colloid, silicone doped material and the like.

Referring to fig. 3, fig. 3 is a schematic cross-sectional view of a flexible display panel according to a second embodiment of the present disclosure.

In some embodiments, the flexible cover plate assembly 13 includes a second packaging structure 132 and a colloid layer 133 attached to the second packaging structure 132, the colloid layer 133 is connected to the OLED device layer 12, the colloid layer 133 is provided with the groove 131 in the above embodiments, and the groove 131 is disposed corresponding to the first packaging structure 14.

The second encapsulation structure 132 is a flexible sealing film, which can isolate moisture from entering the OLED device layer 12. The flexible sealing film comprises a compact organic hybrid film, and the main components of the organic hybrid film can be polyaryl esters, polyaryl ethers, polysiloxanes, aromatic polyether ether ketone and the like. The main component of the colloidal layer 133 may be transparent polyimide, transparent aromatic ether, or the like.

The depth of the groove 131 may be smaller than the thickness of the colloid layer 133, or equal to the thickness of the colloid layer 133. It will be appreciated that the greater the depth of the recess 131, the greater the contact area between the first encapsulation structure 14 and the flexible cover member 13. Optionally, the depth of the groove 131 is equal to the thickness of the colloid layer 133, so that when the groove 131 penetrates through the colloid layer 133, the contact area between the first encapsulation structure 14 and the flexible cover plate assembly 13 reaches the maximum, so that the first encapsulation structure 14 is not easy to fall off from the flexible cover plate assembly 13, and the first encapsulation structure 14 is more favorable for blocking moisture from entering the OLED device layer 12. The colloidal layer 133 has a thickness of 0.5 mm to 50 mm. For example 2 mm, 25 mm, 48 mm. The width of the notch may be 1 mm to 5 mm, for example, 1 mm, 2 mm. The recess 131 may be located 2 mm to 18 mm, e.g., 3 mm, 10 mm, or 15 mm, from the edge of the colloidal layer 133.

For example, when the thickness of the colloid layer 133 is 25 mm, the groove 131 may be disposed 5 mm from the edge of the colloid layer 133, the width of the notch is 1 mm, and the depth of the groove is 25 mm.

In some embodiments, with continued reference to fig. 1 and 2, the flexible cover plate assembly 13 includes a display region 134 and a non-display region 135 disposed around the display region 134, the OLED device is disposed in the display region 134, the groove 131 is disposed in the non-display region 135, the OLED device layer 12 is disposed in the display region 134, the groove 131 is disposed in the non-display region 135, the groove 131 is annular and a notch of the groove 131 extends around the display region 134. It is understood that when the groove 131 is annular in shape and the notch of the groove 131 extends around the display area 134 and the first encapsulation structure 14 is gel-like, the first encapsulation structure 14 can be disposed around the OLED device layer 12 and fill the groove 131, the first encapsulation structure 14 is connected to the flexible substrate 11, such that the flexible substrate 11, the first encapsulation structure 14 and the flexible cover plate assembly 13 form a closed cavity, and the cavity can accommodate the OLED device layer 12.

Referring to fig. 4 and fig. 5, fig. 4 is a second structural schematic diagram of the flexible cover assembly according to the embodiment of the present application, and fig. 5 is a third structural schematic diagram of the flexible cover assembly according to the embodiment of the present application.

The groove 131 may include a plurality of sub-groove segments 1311, the sub-groove segments 1311 are connected in sequence, and the notch of each sub-groove segment 1311 extends in an arc shape or a zigzag shape. It can be understood that when the sub-groove segment 1311 is arc-shaped (as shown in fig. 4) or zigzag-shaped (as shown in fig. 5), the inner surface area of the groove 131 is increased, which is beneficial to increase the contact area between the first encapsulation structure 14 and the flexible cover plate assembly 13, so that the first encapsulation structure 14 is not easy to fall off, and is more beneficial to the first encapsulation structure 14 to block moisture from entering the OLED device layer 12.

Referring to fig. 6, fig. 6 is a schematic cross-sectional view of a flexible display panel according to an embodiment of the present disclosure.

In some embodiments, the flexible display panel 10 further includes a third encapsulation structure 15, the third encapsulation structure 15 being disposed between the OLED device layer 12 and the flexible cover sheet assembly 13. The third Encapsulation structure 15 adopts a Thin-Film Encapsulation (TFE) technology, and may further serve as a sealing function for the OLED device layer 12.

Referring to fig. 7 and 8, fig. 7 is a schematic flow chart of a method for manufacturing a flexible display panel according to an embodiment of the present disclosure, and fig. 8 is a schematic process flow chart of the flexible display panel according to the embodiment of the present disclosure.

The embodiment of the present application further provides a method for manufacturing the flexible display panel 10, which includes the following specific steps:

referring to fig. 8(1), step S100 is to provide a flexible substrate 11, and form an OLED device layer 12 on the flexible substrate 11.

Wherein, since the flexible display panel 10 is stretchable, foldable, bendable, or rollable, the flexible substrate base 11 is also stretchable, foldable, bendable, or rollable. The flexible substrate 11 may be formed of any suitable insulating material having flexibility. The flexible substrate 11 may be an organic polymer or an organic-inorganic doped composite. For example, the organic polymer may be Polyimide (PI) or polyethylene terephthalate (PET), etc.; the inorganic-organic doped composite can be formed by doping glass fiber in an organic polymer, i.e., polyimide, and the glass fiber has higher toughness, so that the flexible strength of the flexible substrate 11 can be remarkably improved, the flexible substrate is not easy to break and peel when bent, and the service life of the flexible substrate 11 can be effectively prolonged. The main method for manufacturing the flexible substrate 11 is to form the flexible substrate 11 on a carrier substrate (e.g. a high temperature resistant glass substrate), where the surface of the flexible substrate 11 adjacent to the carrier substrate is generally called a bottom surface and the opposite surface is generally called a top surface. Then, electronic devices (such as thin film transistors, resistors, capacitors, and the like) are formed on the top surface of the flexible substrate 11, and other steps of manufacturing the flexible display panel 10 are performed, and finally, the flexible panel is peeled off from the carrier substrate.

Among them, the OLED device layer 12 serves as a functional layer of the flexible display panel 10, and the functional layer plays an important role of emitting light and is a core layer of the flexible display panel 10. The OLED device layer 12 generally includes: the light-emitting diode comprises an anode, a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, an electron injection layer and a cathode. The light emitting principle of the OLED device layer 12 is that semiconductor materials and organic light emitting materials emit light by carrier injection and recombination under the driving of an electric field. Specifically, the OLED device layer 12 generally uses an indium tin oxide electrode and a metal electrode as an anode and a cathode of the device, respectively, and under a certain voltage, electrons and holes are injected into the electron transport layer and the hole transport layer from the cathode and the anode, respectively, and the electrons and the holes migrate to the light emitting layer through the electron transport layer and the hole transport layer, respectively, and meet at the light emitting layer to form excitons and excite light emitting molecules, which emit visible light through radiative relaxation.

Specifically, the OLED device layer 12 may be formed on the flexible substrate 11 by a deposition process, an evaporation process, a solution process, or the like, to form the OLED device layer 12.

Referring to fig. 8(2), step S200 is to provide a flexible cover plate assembly 13, and form a groove 131 on the flexible cover plate assembly 13.

The flexible cover plate assembly 13 has a sealing effect, and can block moisture from entering the OLED device layer 12. The flexible cover assembly 13 is disposed opposite to the flexible substrate 11, and in terms of the display device, the flexible cover assembly 13 is divided into a display area 134 and a non-display area 135 disposed around the display area 134. The groove 131 is disposed in the non-display area 135, and the groove 131 may have only one groove 131 segment, may be disposed around the display area 134, may include a plurality of discontinuous sub-groove segments, or may have a plurality of continuous sub-groove segments with different groove wall areas.

The groove 131 may be formed by performing a local etching or photolithography process on the flexible cover plate assembly 13.

Referring to fig. 8(2), step S300 is to provide a first package structure 14, and partially fill the first package structure 14 in the groove 131.

The first package structure 14 may be an adhesive. It is understood that the first package structure 14 may be filled in the groove 131 and extend from the inside of the groove 131 to the outside of the groove 131.

As shown in fig. 8(3), in step S400, the flexible substrate 11 and the flexible cover plate assembly 13 are attached to each other, so that the first encapsulation structure 14 is disposed on the periphery of the OLED device layer 12 and connected to the flexible substrate 11.

It can be understood that the efficiency can be effectively improved by separately processing and splicing the flexible substrate base plate 11 and the flexible cover plate assembly 13. By providing the groove 131 on the flexible cover assembly 13, the first package structure 14 is at least partially disposed in the groove 131 to increase the contact area between the first package structure 14 and the flexible cover assembly 13, so that the first package structure 14 is not only disposed between the flexible substrate 11 and the flexible cover assembly 13, but also can extend into the groove 131 of the flexible substrate 11. The first package structure 14 not only can support the flexible substrate 11 and the flexible cover plate assembly 13, but also can form a sealed cavity together with the flexible substrate 11 and the flexible cover plate assembly 13, so that the first package structure has better sealing performance. For example, if moisture invades the OLED device layer 12, the moisture needs to enter the groove 131, and then diffuse into the gap between the flexible cover plate assembly 13 and the first encapsulation structure 14, and finally enter the OLED device layer 12. Therefore, moisture entering the OLED device layer 12 is more difficult than in the prior art, i.e., the flexible display panel 10 in the embodiment of the present application can isolate moisture well.

In some embodiments, the flexible cover plate assembly 13 includes a second package structure 132 and a colloid layer 133 attached to the second package structure 132, and the step of forming the groove 131 on the flexible cover plate assembly 13 specifically includes: coating the second package structure 132 with glue, and performing a thermal curing process on the glue to form a glue layer 133; the colloid layer 133 is partially etched to form a recess 131.

In other embodiments, the step of forming the groove 131 on the flexible cover assembly 13 specifically includes: the second package structure 132 is coated with a first encapsulant and a second encapsulant, and the first encapsulant and the second encapsulant are thermally cured to form a groove 131 between the first encapsulant and the second encapsulant. The first colloid and the second colloid together form a colloid layer 133.

The present application also provides a display device comprising the flexible display panel 10 described above. For example, the display device may be a mobile phone, a computer, a notebook computer, a tablet, a television, or the like.

The flexible display panel 10 provided by the embodiment of the application, the flexible display panel 10 includes a flexible substrate 11, an OLED device layer 12, a flexible cover plate assembly 13 and a first packaging structure 14, the OLED device layer 12 and the first packaging structure 14 are disposed between the flexible substrate 11 and the flexible cover plate assembly 13, the first packaging structure 14 is disposed on the periphery of the OLED device layer 12, a partial structure of the first packaging structure 14 is disposed in a groove 131 of the flexible cover plate assembly 13, and the first packaging structure 14 can block moisture from entering the OLED device layer 12. It can be understood that the groove 131 of the flexible cover plate assembly 13 enables the first encapsulation structure 14 and the flexible cover plate assembly 13 to have a larger contact area, so that the first encapsulation structure 14 is not easy to fall off, and it is more favorable for the first encapsulation structure 14 to block moisture from entering the OLED device layer 12.

In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

In the description of the present application, the terms "first", "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more features.

The flexible display panel, the manufacturing method thereof, and the display device provided in the embodiments of the present application are described in detail above. The principles and implementations of the present application are described herein using specific examples, which are presented only to aid in understanding the present application. Meanwhile, for those skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims

1. A flexible display panel, comprising:

a flexible substrate base plate;

the OLED device layer is arranged on the flexible substrate base plate;

the flexible cover plate assembly is arranged on one side, away from the flexible substrate, of the OLED device layer and is provided with a groove;

2. The flexible display panel of claim 1, wherein the material of the first encapsulation structure is a hydrophobic material.

3. The flexible display panel of claim 1, wherein the flexible cover plate assembly comprises a second encapsulation structure and a colloid layer attached to the second encapsulation structure, the colloid layer is connected with the OLED device layer, the colloid layer is provided with the groove, and the groove is arranged corresponding to the first encapsulation structure.

4. The flexible display panel of claim 3, wherein the depth of the groove is equal to the thickness of the glue layer such that the groove penetrates the glue layer.

5. The flexible display panel of claim 3, wherein the groove has a width of 1 millimeter.

6. The flexible display panel of any one of claims 1 to 5, wherein the flexible cover sheet assembly comprises a display area and a non-display area disposed around the display area, the OLED device layer is disposed in the display area, the groove is disposed in the non-display area, the groove is annular in shape and a notch of the groove extends around the display area.

7. The flexible display panel of claim 6, wherein the groove comprises a plurality of sub-groove segments, and the notch of each sub-groove segment extends in an arc shape or a zigzag shape.

8. A method for manufacturing a flexible display panel, comprising:

9. The method of claim 8, wherein the flexible cover assembly comprises a second package structure and a glue layer attached to the second package structure, and the forming of the groove on the flexible cover assembly comprises:

and locally etching the colloid layer to form the groove.

10. A display device characterized by comprising the flexible display panel according to any one of claims 1 to 7.