CN111740026B

CN111740026B - Flexible display panel

Info

Publication number: CN111740026B
Application number: CN202010469072.6A
Authority: CN
Inventors: 胡云祥; 包金豹; 冉松松; 宋洋; 赵丽婷
Original assignee: Yungu Guan Technology Co Ltd
Current assignee: Yungu Guan Technology Co Ltd
Priority date: 2020-05-28
Filing date: 2020-05-28
Publication date: 2023-06-20
Anticipated expiration: 2040-05-28
Also published as: CN111740026A

Abstract

The application belongs to the technical field of display panels, and particularly relates to a flexible display panel, which comprises a luminous display layer, a buffer layer and a first film layer, wherein the luminous display layer comprises a plurality of luminous pixel units; the buffer layer comprises a plurality of buffer columns with different heights, and the buffer columns are arranged on one side of the display surface of the luminous display layer in a dispersing way; the first film pasting layer is attached to one side, away from the luminous display layer, of the buffer column. The flexible display panel of this application embodiment has improved flexible display panel's crashproof and resistant performance, and effectual reduction or the elimination external force is to the impact of luminous display layer, improves flexible display panel's life.

Description

Flexible display panel

Technical Field

The present application relates to the field of display panel technologies, and in particular, to a flexible display panel.

Background

An organic light emitting diode (Organic Light Emitting Diode, abbreviated as OLED) display device has the characteristics of self-luminescence, wide viewing angle, high luminous efficiency, low power consumption, quick response time, good low-temperature characteristics and the like. Organic electroluminescent diode display technology can be made into flexible display products because it does not require liquid crystal filling. In recent years, with the continuous development and innovation of display technology, a new generation of flexible display has become the mainstream of today, but with the continuous development of light weight and flexibility of display devices, the original structure of protecting a display panel by a glass cover plate when impacted has not been able to meet the current flexible display device, and therefore, the protection problem of the flexible display panel needs to be solved.

Disclosure of Invention

In view of this, the technical problem that this application mainly solves is to provide a flexible display panel, can reduce the probability that flexible display panel receives the damage of external force.

In order to solve the technical problems, one technical scheme adopted by the application is as follows: the flexible display panel comprises a luminous display layer, a buffer layer and a first film pasting layer, wherein the buffer layer comprises a plurality of buffer columns with different heights, and the buffer columns are arranged on one side of the display surface of the luminous display layer in a dispersing mode; the first film pasting layer is attached to one side, far away from the luminous display layer, of the buffer column.

The buffer layer and the first film pasting layer are arranged for reinforcing the flexible display panel, so that the luminous display layer is protected when the flexible display panel is impacted by external force, and the impact resistance and the drop resistance of the flexible display panel are improved; through setting up the buffer post of difference in height and making flexible display panel can external force give twice more effort, can effectually reduce or eliminate the impact of external force to luminous display layer.

And buffer wires are connected between the buffer columns, so that the buffer columns and the buffer wires form a buffer net which is laminated on the luminous display layer. The application is implemented through setting up the buffer wire between the buffer post, can reduce the condition of flexible display panel display surface's stress gathering, improves flexible display panel's holistic pliability, reduces the weak problem of single position atress rigidity.

The distance between the buffer wire and one end of the buffer post, which is close to the luminous display layer, is one third to two thirds of the height of the buffer post. Through setting for the buffer wire in this position department, can make the buffer wire connect as an organic wholely with a plurality of buffer columns, can effectually pass through the buffer wire with local regional atress and disperse to the plane that the buffer net is located, the position that the buffer wire set up is close to the buffer column the distance of luminous display layer one end is the third to the two places of third of buffer column height, buffer wire and luminous display layer contactless, and form the fretwork region between buffer wire and the luminous display layer, be favorable to the bending of flexible display screen for the buffer wire has certain space of buckling, can reduce the produced stress of flexible display panel buckling, flexible display panel also be difficult for with luminous display layer and first pad pasting layer contact at the in-process buffer wire of buckling, reduce the flexibility and like panel bending or bending stress.

The light-emitting display layer comprises a plurality of light-emitting pixel units, and the orthographic projection of the buffer column on the light-emitting display layer is not overlapped with the light-emitting pixel units. The luminous display layer comprises a pixel definition layer and a luminous pixel unit, and the luminous pixel unit is not shielded by the buffer column, so that the light emitting of the pixel luminous unit is not influenced, and the influence of the buffer layer on the light emitting of the luminous pixel unit is reduced.

The display device comprises a first film sticking layer, a second film sticking layer and a light-emitting display layer, wherein the first film sticking layer is positioned between the buffer layer and the light-emitting display layer. The first film layer, the buffer column and the second film layer are laminated to form a composite film. Through setting up the second pad pasting layer can make the second pad pasting layer that has an integrated structure between buffer post and the luminous display layer, wherein the second pad pasting layer has the viscidity, as the tie coat adhesion in between luminous display layer and the buffer post, improve the bonding strength of buffer post and luminous display layer, and then can improve the bonding strength of compound rete and luminous display layer.

The buffer columns comprise first buffer columns and second buffer columns, the height of the first buffer columns on the luminous display layer is larger than that of the second buffer columns on the luminous display layer, the height difference between the first buffer columns and the second buffer columns is larger than a threshold value, the first buffer columns and the second buffer columns are arranged in a staggered mode, and the threshold value does not belong to an error value produced by the first buffer columns and the second buffer columns. The first buffer columns and the second buffer columns are arranged in a staggered mode, so that the buffer columns can be uniformly provided with different structures, external force can be uniformly buffered, and the buffer effect is improved.

The buffer column is gradually reduced in cross section along a first direction perpendicular to the display surface of the light-emitting display layer and towards the first film pasting layer. When an object collides with the buffer post, the cross section area of the post is gradually reduced, so that the object is easy to slide down along the surface of the buffer post, and is buffered by the buffer wire and/or the buffer post with lower height, and damage to the flexible display device is reduced.

The end face of the buffer column, which is far away from one end of the luminous display layer, is an arc-shaped curved surface or a plane, and the arc-shaped curved surface is bent towards one side of the luminous display layer. The arc-shaped curved surface can give the object an effect of increasing secondary buffering, and the impact of the object on the flexible display panel can be dispersed to a certain extent. The plane structure can make the object reverse acting force even, and object and buffer column's area of contact is great, gives the buffer column less of pressure that causes for buffer column deformation is less.

The edge areas of the first film pasting layer and the second film pasting layer are attached, so that the buffer layer is sealed in a cavity formed by the first film pasting layer and the second film pasting layer. The buffer layer can be prevented from being exposed, and objects such as water vapor or impurities can be prevented from entering between the buffer columns of the buffer layer to influence the display effect of the flexible display panel.

The display device comprises a light-emitting display layer, a buffer layer and an encapsulation layer, wherein the encapsulation layer is arranged between the light-emitting display layer and the buffer layer. The buffer layer and the first film layer are arranged outside the packaging layer, so that the display surface of the flexible display screen is integrally protected.

The thickness and the hardness of the second film layer are larger than those of the first film layer, so that the surface of the flexible display panel is higher in impact resistance or drop resistance.

The beneficial effects of this application are: compared with the prior art, the flexible display panel is used for reinforcing the flexible display panel by arranging the buffer layer and the first film layer, protecting the luminous display layer when being impacted by external force, and improving the impact resistance and the drop resistance of the flexible display panel; the flexible display panel of the embodiment of the application, wherein the first film pasting layer is a flexible film layer and has certain viscosity and can be adhered to the buffer layer; the buffer column dispersion in the buffer layer is set up for the setting of buffer layer does not influence flexible display panel's flexibility, avoids the buffer layer to be a plane layer to flexible display panel's bending property's restriction.

In addition, this application embodiment is through setting up the buffer post of difference in height for when the luminous display layer one side of flexible display panel received external force striking, wherein the higher buffer post of cylinder height receives external force to take place deformation, gives the elastic force component opposite with external force, with the impact of reduction external force, the higher buffer post of cylinder takes place deformation height and reduces, the lower buffer post of cylinder height contacts with external force, gives the effort of external force an opposite direction again, thereby can reduce the impact of external force to luminous display layer again. The buffer layer can realize small gradient and disperse external force by arranging the buffer columns with different heights, and can effectively reduce or eliminate the impact of the external force on the luminous display layer.

Drawings

FIG. 1 is a schematic cross-sectional view of an embodiment of a flexible display panel

FIG. 2 is a schematic view of an exploded structure of a first embodiment of a flexible display panel of the present application;

FIG. 3 is a schematic cross-sectional view of the flexible display panel along line A-A' of FIG. 2;

FIG. 4 is a schematic view of an exploded structure of a second embodiment of a flexible display panel of the present application;

FIG. 5 is a schematic cross-sectional view of the flexible display panel along line A-A' of FIG. 4;

FIG. 6 is a schematic view of an exploded structure of a third embodiment of a flexible display panel of the present application;

FIG. 7 is a schematic cross-sectional view of the flexible display panel along line A-A' of FIG. 6;

FIG. 8 is a schematic cross-sectional view of an embodiment of a flexible display panel;

fig. 9 is a schematic top view of an embodiment of a buffer layer of 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.

Referring to fig. 1, the flexible display panel includes a light-emitting display layer 10, a buffer layer 20 and a first film layer 30, wherein the buffer layer 20 includes a plurality of buffer columns 21 with different heights, and the buffer columns 21 are arranged on one side of a display surface of the light-emitting display layer 10 in a dispersing manner; the first film layer 30 is attached to the buffer post 21 at a side far away from the light emitting display layer 10.

The above is the core content of the embodiment of the present application, and in the embodiment of the present application, the buffer layer 20 and the first film layer 30 are provided to reinforce the flexible display panel, protect the light-emitting display layer 10 when being impacted by external force, and improve the impact resistance and the crash resistance of the flexible display panel; in addition, in the flexible display panel of the embodiment of the present application, the first film layer 30 is a flexible film layer, and has a certain viscosity, and can be adhered to the buffer layer 20; the buffer columns 21 in the buffer layer 20 are arranged in a dispersed manner, so that the arrangement of the buffer layer 20 does not affect the flexibility of the flexible display panel, and the limitation of the bending performance of the flexible display panel caused by the fact that the buffer layer 20 is a planar layer is avoided; according to the embodiment of the application, the buffer columns 21 with different heights are arranged, so that when one side of the luminous display layer 10 of the flexible display panel is impacted by external force, the buffer column 21 with higher column height is deformed by the external force and gives the elastic force component opposite to the external force, the impact of the external force is reduced, the buffer column 21 with higher column height is deformed and is reduced, the buffer column 21 with lower column height is contacted with the external force, and the acting force in the opposite direction of the external force is given again, so that the impact of the external force to the luminous display layer 10 can be reduced again. The buffer layer 20 of the embodiment of the present application can realize gradient reduction and dispersion of external force by setting the buffer columns 21 with different heights, and can effectively reduce or eliminate impact of external force on the light emitting display layer 10.

In an embodiment of the present application, as shown in fig. 1, the buffer layer includes a plurality of buffer columns 21 with different heights, and the buffer columns 21 with different heights may be randomly arranged. In another embodiment of the present application, as shown in fig. 2 and 3, the buffer columns 21 with different heights may be arranged in a certain order to form a buffer column array.

As shown in fig. 3, in the embodiment of the present application, the light emitting display layer 10 includes a pixel defining layer 12 and a light emitting pixel unit 11 that is in the same layer as the pixel defining layer 12, and may further include a substrate and a pixel circuit array. As shown in fig. 7, the flexible display panel of the embodiment of the present application further includes an encapsulation layer 60, and the encapsulation layer 60 is disposed between the light emitting display layer 10 and the buffer layer 20. Further, the flexible display panel further includes a polarizer layer (not shown) disposed between the encapsulation layer 60 and the buffer layer 20.

As shown in fig. 4 and 5, buffer wires 22 are connected between the buffer posts 21 with different heights, so that the buffer posts 21 and the buffer wires 22 form a buffer mesh laminated on the light emitting display layer 10. This application is implemented through setting up buffer wire 22 between buffer post 21, can reduce the condition of flexible display panel display surface's stress gathering for the stress that display panel received obtains horizontal dispersion, improves the holistic flexibility of flexible display panel, reduces the problem that single position atress rigidity is weak. Specifically, in this embodiment of the application, through setting up the buffer wire 22 between the buffer post 21 for the whole face of the buffer net that forms is on a parallel with luminous display layer 10, and when a certain position of flexible display panel received the external force effect, the buffer wire 22 can be followed the external force and dispersed in the direction of being on a parallel with luminous display layer 10 place plane, reduces the impact of local position point force to flexible display panel, reduces or avoids the invasion of luminous display unit layer to receive external force, improves flexible display panel's life. When the flexible display panel is subjected to external force, the buffer wires 22 can connect the buffer posts 21 into a whole, so that the buffer layer 20 can entirely disperse the external force. When flexible display screen is in buckling or crooked, can make flexible display screen buckling or the inside problem that there is stress concentration of crooked department, the flexible display panel of long-time buckling or crooked, or frequent buckling, crooked flexibility display panel, flexible display screen internal stress concentration department easily influences flexible display panel's life, this application embodiment is through setting up buffer wire 22 between buffer post 21, can make flexible display panel internal stress concentration department can be dispersed along being on a parallel with the plane of luminous display layer 10 with the stress through the buffer wire 22 in the buffer wire, thereby can improve flexible display panel and buckle the circumstances that causes internal stress concentration when crooked, improve flexible display panel's life.

Wherein the buffer wire 22 is disposed at a distance L from one end of the buffer post 21 near the light emitting display layer 10, which is one third to two thirds of the height of the buffer post 21. Specifically, in the embodiment, the distance L between the buffer wire 22 and the end of the buffer post 21 near the light-emitting display layer 10 is two-thirds of the height of the buffer post 21, i.e. the buffer wire 22 is disposed at two-thirds of the height of the buffer post 21. In the embodiment of the application, the buffer wires 22 are set at the positions, so that the buffer wires 22 can connect a plurality of buffer columns 21 into a whole, and local area stress can be effectively dispersed to the plane where the buffer net is located through the buffer wires 22; as a preferred scheme of this application embodiment, buffer wire 22 and luminous display layer 10 contactless, and form hollow out area between buffer wire 22 and the luminous display layer 10, be favorable to the bending of flexible display screen for buffer wire 22 has certain space of buckling, can reduce the stress that flexible display panel buckled produced, and flexible display panel also is difficult for with luminous display layer 10 and first pad pasting layer 30 contact at the in-process that buckles buffer wire 22, and buffer wire 22 buckles the resistance that exists less. In other embodiments, the buffer wire 22 is disposed at a distance L from one end of the buffer post 21 near the light emitting display layer 10, which is one third, one half, or three fifths of the height of the buffer post 21. The buffer wires 22 can be ensured to connect the buffer columns 21 into a buffer net to disperse local stress, and the buffer wires 22 can be prevented from contacting the luminous display layer 10 and the first film pasting layer 30 in the bending process, so that bending or bending stress of the flexible display panel is reduced. In the above preferred embodiment, the buffer wire 22 may be disposed at one end of the buffer post 21 near the first film layer 30.

Specifically, in the preferred embodiment of the present application, the cross-sectional area of the buffer wire 22 may be in the range of one-half to two-thirds of the cross-sectional area of the top end of the buffer post 21.

The light-emitting display layer 10 includes a plurality of light-emitting pixel units 11, and the front projection of the buffer post 21 on the light-emitting display layer 10 does not overlap with the light-emitting pixel units 11. The light-emitting display layer 10 includes a pixel defining layer 12 and a light-emitting pixel unit 11, and in this embodiment, the buffer column 21 is provided so as not to block the light-emitting pixel unit 11, so that the light-emitting of the pixel light-emitting unit is not affected, and the influence of the buffer layer 20 on the light-emitting of the light-emitting pixel unit 11 is reduced. That is, the buffer post 21 in the embodiment of the present application corresponds to the pixel defining layer 12, so that the projection of the buffer post 21 on the light emitting display layer 10 falls within the pixel defining layer 12. The buffer post 21 and the buffer wire 22 in this embodiment are preferably made of transparent materials, specifically may be transparent Polyimide (PI), while the cross-sectional area of the buffer wire 22 in this preferred embodiment is smaller, the projection on the light-emitting display layer 10 is smaller, the shielding effect on the light-emitting pixel unit 11 is smaller, and the influence of refraction and scattering generated when the light emitted by the light-emitting pixel unit 11 encounters the buffer layer 20 on the light intensity can be reduced. In other embodiments, the material of the buffer post 21 and the buffer wire 22 may be transparent Photoresist (PR).

As a preferred embodiment of the present application, as shown in fig. 6 and 7, the flexible display panel further includes a second film layer 40, where the second film layer 40 is located between the buffer layer 20 and the light emitting display layer 10. The second film layer 40 with an integral structure between the buffer post 21 and the light-emitting display layer 10 can be provided by the second film layer 40, wherein the second film layer 40 has adhesiveness and is adhered between the light-emitting display layer 10 and the buffer post 21 as an adhesive layer, so that the bonding strength of the buffer post 21 and the light-emitting display layer 10 is improved, and the bonding strength of the composite film layer and the light-emitting display layer 10 can be improved.

In this embodiment, the first film layer 30, the buffer post 21 and the second film layer 40 are laminated to form a composite film. In other embodiments, the first film layer 30, the buffer post 21, and the second film layer 40 may be bonded by other methods to form a composite film.

Preferably, in the embodiment of the present application, the edge regions of the first film layer 30 and the second film layer 40 are attached, so that the buffer layer 20 is sealed in the sealed cavity 50 formed by the first film layer 30 and the second film layer 40. In this embodiment, the material of the first film layer 30 is transparent first Polyimide (PI), or the surface of the transparent first Polyimide (PI) layer far away from one side of the light emitting display layer 10 is hardened. The second film layer 40 in this embodiment is a transparent second Polyimide (PI), where the hardness of the second polyimide may be the same as or different from the hardness of the first polyimide. According to the embodiment of the application, the first film layer 30, the buffer layer 20 and the second film layer 40 are attached at a high temperature, so that the first film layer 30 is attached to the buffer layer 20, the first film layer 30 also forms different surface structures along with the first film layer 30, the edge areas of the first film layer 30 and the second film layer 40 are attached, the first film layer 30 and the second film layer 40 can form the sealing cavity 50, the buffer layer 20 is arranged in the sealing cavity 50, the buffer layer 20 is prevented from being exposed, and objects such as water vapor or impurities are prevented from entering between the buffer columns 21 of the buffer layer 20 to affect the display effect of the flexible display panel. In addition, in the embodiment of the application, the edge areas of the first film pasting layer 30 and the second film pasting layer 40 are pasted, so that the manufacturing method is simple. In other embodiments, the peripheral regions of the first and second

adhesive layers

30 and 40 may be bonded by OCA transparent adhesive to form the sealed cavity 50.

As a preferred aspect of the embodiments of the present application, the thickness and hardness of the first film layer 30 of the embodiments of the present application is greater than the hardness and thickness of the second film layer 40. In this embodiment, the first film layer 30 includes a transparent first Polyimide (PI), the second film layer 40 includes a transparent second Polyimide (PI), and the hardness of the first film layer 30 is greater than the hardness of the second film layer 40 by controlling the proportion of the curing agent, the curing temperature, etc., so that the surface of the flexible display panel has higher impact resistance or drop resistance. In this embodiment of the present application, the thickness of the first film layer 30 is greater than the thickness of the second film layer 40, so that when the first film layer 30 of the flexible display panel is impacted by external force or falls, the protection strength of the first film layer 30 is greater. Specifically, the thickness of the first film layer 30 in the embodiment of the present application is 50nm, and the thickness of the second film layer 40 is 20nm. In other embodiments, the thickness of the first film layer 30 may be in the range of 40-60nm, for example, the thickness of the first film layer 30 is 40nm, 45nm, 55nm, 60nm, or the like; the thickness of the second film layer 40 may be in the range of 15-25nm, for example, the thickness of the second film layer 40 is 15nm, 18nm, 22nm, 25nm, or the like.

In a preferred embodiment of the present application, the buffer columns 21 include a first buffer column 211 and a second buffer column 212, the height of the first buffer column 211 on the light emitting display layer 10 is greater than the height of the second buffer column 212 on the light emitting display layer 10, the height difference between the first buffer column 211 and the second buffer column 212 is greater than a threshold, and the first buffer column 211 and the second buffer column 212 are staggered, wherein the threshold is not an error value produced by the first buffer column 211 and the second buffer column 212, and the threshold is a preset certain fixed value. In the embodiment of the present application, the buffer pillars 21 are nano pillars, and the height of the buffer pillars 21 ranges from 20nm to 40nm, for example, the threshold ranges from 5nm to 20nm, and specifically, the threshold may be 5nm, 8nm, 10nm, 15nm, 20nm, or the like. Specifically, in the embodiment of the present application, the height of the first buffer column 211 is 30nm, the height of the second buffer column 212 is 20nm, and the threshold is 10nm. In this embodiment, the first buffer columns 211 and the second buffer columns 212 are staggered, so that the buffer columns 21 can form uniform structures with different heights. For example, the first buffer columns 211 form a first buffer column 211 array, the second buffer columns 212 form a second buffer column 212 array, the first buffer column 211 array is parallel to the second buffer column 212 array, and the first buffer columns 211 and the second buffer columns 212 are staggered. In the embodiment of the present disclosure, only one manner of staggering the first buffer columns 211 and the second buffer columns 212 is provided, and in other embodiments, the manner of staggering the first buffer columns 211 and the second buffer columns 212 may be other types of arrangement manners, and may be set according to the shape of the pixel defining layer 12 around the light emitting pixel unit 11. In this application embodiment, the buffer wire 22 is connected between the adjacent first buffer columns 211 and second buffer columns 212, so that a concave structure is formed between the adjacent two first buffer columns 211 and second buffer columns 212, and the first buffer columns 211 and the second buffer columns 212 are connected through the buffer wire 22, when an object collides with a local surface of the flexible display panel, the object first contacts with the first buffer columns 211, and slides to the second buffer columns 212 through the buffer wire 22, so that the force of decomposing the object can be well buffered, and the force is offset in a direction parallel to the light-emitting display layer 10 and a direction opposite to the elastic force of the buffer columns 21, so that the damage of the flexible display panel is reduced. In this embodiment, the buffer columns 21 include a first buffer column 211 and a second buffer column 212 with a height difference, in other embodiments, the buffer columns 21 may include the first buffer column 211, the second buffer column 212 and the third buffer column with a height difference, the first buffer column 211, the second buffer column 212 and the third buffer column are arranged in a gradient staggered manner, for example, the height of the first buffer column 211 is 30nm, the height of the second buffer column 212 is 25nm, and the height of the third buffer column is 20nm, so that two gradient buffers can be formed to achieve a better buffer effect, and in other embodiments, the buffer columns 21 may also have three or more buffer columns 21 with height differences.

As a preferred embodiment of the present application, the cross-sectional dimension of the pillar 21 in the first direction D1 perpendicular to the display surface of the light-emitting display layer 10 toward the first film layer 30 is gradually reduced. In the present embodiment, by providing the bumper post 21, the cross-sectional dimension of the post in the first direction D1 is gradually reduced, such as the diameter of the cross-section, the distance of the diagonal line of the cross-section, or the area of the cross-section. By arranging the buffer column 21 to gradually reduce the cross section, when an object collides onto the buffer column 21, the cross section of the column is gradually reduced, so that the object easily slides along the surface of the buffer column 21, the object is easily buffered by the buffer wire 22 and/or the buffer column 21 with lower height, and the damage to the flexible display panel is reduced.

In this embodiment, as shown in fig. 9, the bottom end of the buffer post 21 is quadrangular, and in other embodiments, the shape of the bottom end of the buffer post 21 may be circular, or polygonal such as triangle, pentagon, hexagon, etc.

As a preferred embodiment of the present application, as shown in fig. 3, 5, 7 and 8, the end surface of the buffer post 21 away from the end of the light emitting display layer 10 is an arc-shaped curved surface, and the arc-shaped curved surface is curved toward the side of the light emitting display layer 10. The terminal surface that luminous display layer 10 one end (top) was kept away from through setting up buffer post 21 is arc curved surface for when the flexible display panel of object striking, the object can receive the reverse elasticity that buffer post 21 gave, and the object can be followed the arc curved surface gliding on buffer post 21 top, and the arc curved surface can give the object and increased the effect of secondary buffering, can disperse the impact of object to flexible display panel to a certain extent. Of course, in other embodiments, as shown in fig. 1, the end surface of the buffer post 21 away from the end of the light emitting display layer 10 may be a plane.

The embodiment of the application provides a manufacturing method of a flexible display panel, which comprises the following steps:

step 100: a light emitting display layer 10 is provided, wherein the light emitting display comprises a pixel defining layer 12 and a light emitting pixel unit 11.

Step 200: a transparent Polyimide (PI) layer is coated on one side of the display surface of the light-emitting display layer 10, and a pattern is manufactured by controlling a partial region of the mask plate to be semi-transparent, fully-transparent and opaque, and the mask plate is used for an exposure process and etched to form buffer columns 21 with different heights as the buffer layer 20. In other embodiments, the material coated to form the buffer layer 20 may be a transparent Photoresist (PR). Preferably, the projection of the buffer post 21 formed on the light emitting display layer 10 does not overlap with the light emitting pixel unit 11, i.e., the buffer post 21 formed faces the pixel defining layer 12 of the light emitting display layer 10.

Step 300: a layer of transparent first Polyimide (PI) is coated, and the first polyimide and the buffer columns 21 are softened by high-temperature lamination, and the first polyimide is attached to the buffer layer 20, so that the buffer columns 21 with different heights form a first film attaching layer 30.

Further, in step 200, a progressively changing semi-transparent region is provided between the semi-transparent region and the full-transparent region of the mask plate corresponding to the buffer columns 21 having different heights, so that the buffer wire 22 is formed by an exposure process and a reverse etching process. By controlling the semi-transparent area which gradually changes, the distance between the buffer wire 22 and the buffer post 21 near one end of the luminous display layer 10 can be controlled to be one third to two thirds of the height of the buffer post 21; through the reverse etching process, the bottom of the position corresponding to the buffer wire 22 can be hollowed out, so that a hollowed-out area is formed between the buffer wire 22 and the light-emitting display layer 10. The embodiment of the present application provides only one preferred solution, the manufacturing process is simpler, and in other embodiments, the buffer wire 22 and the buffer post 21 of the buffer layer 20 may be formed by other methods.

Step 110 is also included before step 200: a transparent second Polyimide (PI) is coated on the display surface side of the light emitting display layer 10 to form a second film layer 40. Step 300 is to coat a layer of transparent first Polyimide (PI), soften the first polyimide, the buffer layer 20, and the second polyimide film layer by high temperature lamination, bond the first polyimide to the buffer column 21 by high temperature lamination, and form a first film layer 30 along with the buffer columns 21 with different heights; the edges of the first polyimide and the second polyimide are bonded to form a sealed cavity 50, and the buffer layer 20 is sealed in the sealed cavity 50. In other embodiments, a layer of OCA glue may be disposed on the edge regions of the first polyimide and the second polyimide, so that the first film layer 30 and the second film layer 40 are formed to seal the cavity 50.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the patent application, and all equivalent structures or equivalent processes using the descriptions and the contents of the present application or other related technical fields are included in the scope of patent protection of the present application.

Claims

1. A flexible display panel, comprising:

a light emitting display layer and a packaging layer;

the buffer layer comprises a plurality of buffer columns with different heights, the buffer columns are arranged on one side of the display surface of the luminous display layer in a dispersing mode, and the packaging layer is positioned between the luminous display layer and the buffer layer;

the first film pasting layer is attached to one side, far away from the luminous display layer, of the buffer column;

the buffer wires are connected among the buffer posts with different heights, so that the buffer posts and the buffer wires form a buffer net which is laminated on the luminous display layer; and a hollowed-out area is formed between the buffer wire and the luminous display layer.

2. The flexible display panel according to claim 1, wherein the buffer wire is disposed at a distance of one third to two thirds of a height of the buffer post from an end of the buffer post near the light emitting display layer.

3. A flexible display panel according to claim 1, wherein the light emitting display layer comprises a plurality of light emitting pixel units, and wherein the front projection of the buffer post onto the light emitting display layer does not overlap with the light emitting pixel units.

4. The flexible display panel of claim 1, comprising a second film layer positioned between the buffer layer and the light emitting display layer.

5. The flexible display panel according to any one of claims 1 to 4, wherein the buffer columns include a first buffer column and a second buffer column, a height of the first buffer column on the light emitting display layer is greater than a height of the second buffer column on the light emitting display layer, a height difference between the first buffer column and the second buffer column is greater than a threshold, and the first buffer column and the second buffer column are staggered, wherein the threshold is not an error value of the first buffer column and the second buffer column.

6. The flexible display panel of claim 1, wherein the buffer post has a decreasing cross-sectional dimension along a first direction perpendicular to the display surface of the light emitting display layer toward the first film layer.

7. The flexible display panel according to claim 6, wherein an end surface of the buffer post away from one end of the light-emitting display layer is an arc-shaped curved surface or a plane, and the arc-shaped curved surface is curved toward one side of the light-emitting display layer.

8. The flexible display panel of claim 4, wherein the first film ply and the second film ply are edge-on-edge.

9. A flexible display panel according to claim 1, comprising an encapsulation layer disposed between the light emitting display layer and the buffer layer.