CN111740026A

CN111740026A - Flexible display panel

Info

Publication number: CN111740026A
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: 2020-10-02
Anticipated expiration: 2040-05-28
Also published as: CN111740026B

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 pasting 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 dispersedly arranged on one side of the display surface of the light-emitting display layer; the first film layer is attached to one side, away from the light-emitting display layer, of the buffer column. The flexible display panel of the embodiment of the application has the advantages that the impact resistance and the falling resistance of the flexible display panel are improved, the impact of external force on the luminous display layer is effectively reduced or eliminated, and the service life of the flexible display panel is prolonged.

Description

Flexible display panel

Technical Field

The application relates to the technical field of display panels, in particular to a flexible display panel.

Background

An Organic Light Emitting Diode (OLED) display device has characteristics of self-luminescence, wide viewing angle, high Light Emitting efficiency, low power consumption, fast response time, good low temperature characteristics, and the like. The organic electroluminescent diode display technology can be made into flexible display products because liquid crystal filling is not needed. In recent years, with the continuous development and innovation of display technology, a new generation of flexible display has become the mainstream of the current, but with the continuous development of light weight, thinness and flexibility of display devices, the original structure of protecting a display panel by a glass cover plate when being impacted cannot meet the current flexible display device, and therefore, the protection problem of the flexible display panel is in urgent need to be solved.

Disclosure of Invention

In view of this, the present disclosure provides a flexible display panel, which can reduce the probability of the flexible display panel being damaged by an external force.

In order to solve the technical problem, the application adopts a technical scheme that: the flexible display panel comprises a light-emitting 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 dispersedly arranged on one side of the display surface of the light-emitting display layer; the first film layer is attached to one side of the buffer column, which is far away from the light-emitting display layer.

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 falling resistance of the flexible display panel are improved; through setting up the buffer post that the height is different make flexible display panel can external force give more than twice acting force, can effectually reduce or eliminate the impact of external force to luminous display layer.

Wherein, be connected with the buffering silk between a plurality of buffering posts to make buffering post and buffering silk form range upon range of in the buffering net on luminous display layer. This application implementation can reduce the stress gathering's of flexible display panel display surface condition through set up the buffering silk between the buffering post, improves flexible display panel's holistic pliability, reduces the weak problem of single position atress rigidity.

The distance between the position of the buffer wire and the end, close to the light-emitting display layer, of the buffer column is one third to two thirds of the height of the buffer column. Through setting for the buffering silk in this position department, can be so that the buffering silk can be as an organic whole with a plurality of buffering post connection, can effectually disperse the local area atress to the plane at buffering net place through the buffering silk, the position distance buffering post that the buffering silk set up is close to luminous display layer one end apart from the buffering post is the third to the second third department of buffering post height, buffering silk and luminous display layer contactless, and form fretwork region between buffering silk and the luminous display layer, be favorable to the bending of flexible display screen for the buffering silk has certain bending space, can reduce the produced stress of flexible display panel buckling, flexible display panel buffering silk also be difficult for with luminous display layer and first pad pasting layer contact at the in-process of buckling, reduce the flexibility 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 includes pixel definition layer and luminous pixel unit, and this application embodiment does not influence pixel luminescence unit's light-emitting through setting up the buffer column and not sheltering from luminous pixel unit, reduces the influence of buffer layer to luminous pixel unit light-emitting.

The buffer layer is arranged between the first pad pasting layer and the light-emitting display layer. The first film pasting layer, the buffer column and the second film pasting layer are laminated to form a composite film. Through setting up the second pad pasting layer can be so that the second pad pasting layer that has a body structure between buffer post and the luminous display layer, wherein the second pad pasting layer has viscidity, as the tie coat adhesion in between luminous display layer and buffer post, improve the bonding strength on buffer post and luminous display layer, and then can improve the bonding strength on compound rete and luminous display layer.

Wherein, the bumping post includes first bumping post and second bumping post, and the height of first bumping post on luminous display layer is greater than the height of second bumping post on luminous display layer, and the difference in height of first bumping post and second bumping post is greater than the threshold value, and first bumping post and the crisscross setting of second bumping post, and wherein, the threshold value does not belong to the error value of first bumping post and the preparation of second bumping post. First buffering post and the crisscross setting of second buffering post can be so that the buffering post forms the structure of even difference in height, and buffering external force that can be even improves buffering effect.

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

The end face of the buffer column, which is far 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 bent towards one side of the light-emitting display layer. The arc curved surface can increase the effect of secondary buffering for the object, can disperse the impact of object to flexible display panel to a certain extent. Planar structure can make to give object reverse action even, and the area of contact of object and cushion post is great, and it is less to give the pressure that the cushion post caused for cushion post deformation is less.

The edge regions of the first film pasting layer and the second film pasting layer are pasted together, so that the buffer layer is sealed in a cavity formed by the first film pasting layer and the second film pasting layer. Can avoid exposing for the buffer layer, avoid having objects such as steam or impurity to get into between the buffer column of buffer layer and influence flexible display panel's display effect.

The light-emitting 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, and form integral protection for the display surface of the flexible display screen.

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

The beneficial effect of this application is: different from the prior art, the flexible display panel is provided with the buffer layer and the first film pasting layer and used for reinforcing the flexible display panel, the light-emitting display layer is protected when the flexible display panel is impacted by external force, and the impact resistance and the falling resistance of the flexible display panel are improved; in the flexible display panel of the embodiment of the application, the first film layer is a flexible film layer, has a certain viscosity, and can be adhered to the buffer layer; the buffer posts in the buffer layer of the embodiment of the application are arranged in a dispersed mode, so that the flexibility of the flexible display panel is not influenced by the arrangement of the buffer layer, and the limitation of the bending performance of the flexible display panel by the buffer layer as a plane layer is avoided.

In addition, this application embodiment is through setting up the buffering post of high difference, make when the luminous display layer one side of flexible display panel receives external force striking, wherein the high higher buffering post of cylinder receives external force to take place deformation, give the elastic force component opposite with external force, with the impact that reduces external force, the higher buffering post of cylinder takes place deformation height and reduces, the high lower buffering post of cylinder and external force contact, give the effort of an external force opposite direction once more, thereby can reduce the impact of external force to luminous display layer once more. The buffer layer can realize that the gradient is less, dispersion external force through setting up the buffer post of high difference, can effectually reduce or eliminate the impact of external force to luminous display layer.

Drawings

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

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

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

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

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

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

fig. 7 is a schematic cross-sectional view of the flexible display panel along the 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 a buffer layer 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.

The embodiment of the application provides a flexible display panel, please refer to fig. 1, which 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 pillars 21 with different heights, and the buffer pillars 21 are dispersedly disposed on one side of a display surface of the light emitting display layer 10; the first film layer 30 is attached to the side of the buffer pillar 21 away from the light-emitting display layer 10.

The above is the core content of the embodiment of the present application, in the embodiment of the present application, the buffer layer 20 and the first film layer 30 are arranged to reinforce the flexible display panel, protect the light emitting display layer 10 when being impacted by an external force, and improve the impact resistance and the drop resistance of the flexible display panel; in the flexible display panel of the embodiment of the present application, the first film 30 is a flexible film, has a certain viscosity, and can be adhered to the buffer layer 20; the buffer posts 21 in the buffer layer 20 in the embodiment of the application are arranged dispersedly, so that the arrangement of the buffer layer 20 does not affect the flexibility of the flexible display panel, and the limitation of the buffer layer 20 as a plane layer on the bending performance of the flexible display panel is avoided; this application embodiment is through setting up highly different buffering post 21, make when the luminous display layer 10 one side of flexible display panel receives external force striking, wherein the higher buffering post 21 of cylinder height receives external force to take place deformation, give the elastic force component opposite with external force, in order to reduce the impact of external force, the higher buffering post 21 of cylinder takes place deformation height and reduces, the highly lower buffering post 21 and the external force contact of cylinder, give the effort of an external force opposite direction once more, thereby can reduce the impact of external force to luminous display layer 10 once more. The buffer layer 20 of the embodiment of the application can realize gradient reduction and dispersed external force by arranging the buffer posts 21 with different heights, and can effectively reduce or eliminate the impact of the 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 pillars 21 with different heights, and the buffer pillars 21 with different heights may be randomly arranged. In another embodiment of the present application, as shown in fig. 2 and 3, the buffer posts 21 with different heights may also be arranged in a regular sequence to form a buffer post array.

As shown in fig. 3, in the embodiment of the present application, the light emitting display layer 10 includes a pixel definition layer 12 and a light emitting pixel unit 11 on the same layer as the pixel definition 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 a plurality of buffer posts 21 having different heights, so that the buffer posts 21 and the buffer wires 22 form a buffer net laminated on the light emitting display layer 10. This application is implemented through setting up buffering silk 22 between buffer column 21, can reduce the condition of the stress gathering of flexibility display panel display surface for the stress that display panel received obtains the horizontal dispersion, improves the holistic pliability of flexible display panel, reduces the weak problem of single position atress rigidity. Specifically, this application embodiment, through set up buffering silk 22 between buffering post 21 for the whole face of the buffering net that forms is on a parallel with luminous display layer 10, when flexible display panel certain position received the exogenic action, buffering silk 22 can be with external force along being on a parallel with luminous display layer 10 planar direction dispersion, reduce local position point power to flexible display panel's impact, reduce or avoid luminous display unit layer to receive the infringement of exogenic force, improve flexible display panel's life. When the flexible display panel is acted by external surface force, the buffer wires 22 can connect the buffer posts 21 into a whole, so that the buffer layer 20 can disperse the external surface force integrally. When flexible display screen is in the bending or when crooked, can make flexible display screen kink or the inside problem that has stress concentration of kink, long-time buckling or crooked flexible display panel, or frequent buckling, crooked flexible display panel, flexible display screen internal stress concentration department easily influences flexible display panel's life-span, this application embodiment is through setting up buffer wire 22 between buffer post 21, can make flexible display panel internal stress concentration department can disperse stress along the plane that is on a parallel with luminous display layer 10 through buffer wire 22 in the buffering net, thereby can improve the condition that flexible display panel caused internal stress concentration when buckling or crooked, improve flexible display panel's life.

The distance L between the position of the buffer wire 22 and the end of the buffer column 21 close to the light-emitting display layer 10 is one third to two thirds of the height of the buffer column 21. Specifically, in the embodiment of the present application, the distance L between the buffer wire 22 and the end of the buffer column 21 close to the light-emitting display layer 10 is two thirds of the height of the buffer column 21, that is, the buffer wire 22 is disposed at two thirds of the height of the buffer column 21. In the embodiment of the application, the buffering wires 22 are arranged at the position, so that the buffering wires 22 can connect the buffering columns 21 into a whole, and the stress of a local area can be effectively dispersed to the plane where the buffering net is located through the buffering wires 22; as a preferred scheme of the embodiment of the present application, the buffer wire 22 is not in contact with the light-emitting display layer 10, and a hollow area is formed between the buffer wire 22 and the light-emitting display layer 10, which is beneficial to bending of the flexible display screen, so that the buffer wire 22 has a certain bending space, which can reduce stress generated by bending the flexible display panel, the buffer wire 22 is not easily in contact with the light-emitting display layer 10 and the first film-pasting layer 30 during the bending process of the flexible display panel, and resistance of the buffer wire 22 during the bending process is small. In other embodiments, the buffer wires 22 are disposed at a distance L from one end of the buffer posts 21 close to the light-emitting display layer 10, which is one third, one half or three fifths of the height of the buffer posts 21. The buffer wires 22 can be ensured to connect the buffer columns 21 into a buffer net to disperse local stress, the buffer wires 22 are not contacted with the light-emitting display layer 10 and the first film-sticking layer 30 in the bending process, and the bending or bending stress of the flexible display panel is reduced. The above is a preferred embodiment, and of course, the buffer wire 22 may also be disposed at one end of the buffer column 21 close to the first film-sticking 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 column 21.

The light-emitting display layer 10 includes a plurality of light-emitting pixel units 11, and the orthographic projection of the buffer posts 21 on the light-emitting display layer 10 is not overlapped 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 the light-emitting pixel unit 11 is not shielded by the buffer column 21, 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 posts 21 in the embodiment of the present application correspond to the pixel defining layer 12, so that the projection of the buffer posts 21 on the light emitting display layer 10 falls within the pixel defining layer 12. The buffer column 21 and the buffer wire 22 in the embodiment of the present application are preferably made of a transparent material, and specifically may be made of transparent Polyimide (PI), while the cross-sectional area of the buffer wire 22 in the preferred embodiment of the present application is smaller, the projection on the light emitting display layer 10 is smaller, the shielding influence on the light emitting pixel unit 11 is smaller, and the influence of refraction and scattering formed when the light emitted by the light emitting pixel unit 11 meets the buffer layer 20 on the light emitting intensity can be reduced. In other embodiments, the buffer posts 21 and the buffer wires 22 may also be made of transparent Photoresist (PR).

As a preferred solution of the embodiment of the present application, as shown in fig. 6 and 7, the flexible display panel further includes a second adhesive film layer 40, and the second adhesive film layer 40 is located between the buffer layer 20 and the light emitting display layer 10. Through setting up second pad pasting layer 40 can make buffer post 21 and luminous display layer 10 between have the second pad pasting layer 40 of an organic whole structure, wherein second pad pasting layer 40 has viscidity, as the tie coat adhesion in between luminous display layer 10 and the buffer post 21, improve the bonding strength of buffer post 21 and luminous display layer 10 to can improve the bonding strength of compound rete and luminous display layer 10.

In the embodiment of the present application, the first adhesive film layer 30, the buffer pillar 21 and the second adhesive film layer 40 are laminated to form a composite film. In other embodiments, the first adhesive film layer 30, the buffer posts 21, and the second adhesive 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 to each other, 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 the embodiment of the present invention, the material of the first film layer 30 is transparent first Polyimide (PI), or the surface of the transparent first Polyimide (PI) layer on the side far from the light emitting display layer 10 is hardened. The second film layer 40 of the embodiment of the present application is a transparent second Polyimide (PI), wherein the hardness of the second polyimide may be the same as or different from that of the first polyimide. The embodiment of the application, with first pad pasting layer 30, buffer layer 20 and second pad pasting layer 40 are through the high temperature laminating, can make first pad pasting layer 30 laminate in buffer layer 20, make first pad pasting layer 30 also form the different surface structure of height thereupon, the marginal region laminating of first pad pasting layer 30 and second pad pasting layer 40, first pad pasting layer 30 and second pad pasting layer 40 can form seal chamber 50, buffer layer 20 sets up in seal chamber 50, can make buffer layer 20 avoid exposing, avoid having objects such as steam or impurity to get into between buffer post 21 of buffer layer 20 and influence flexible display panel's display effect. In addition, in the embodiment of the present application, the edge regions of the first film layer 30 and the second film layer 40 are bonded, so that the manufacturing method is simple. In other embodiments, the peripheral regions of the first film layer 30 and the second film layer 40 may also be adhered by OCA transparent adhesive to form the sealed cavity 50.

As a preferable aspect of the embodiment of the present application, the thickness and hardness of the first film-covering layer 30 of the embodiment of the present application are greater than those of the second film-covering layer 40. In the embodiment of the present application, the first film layer 30 includes a transparent first Polyimide (PI), the second film layer 40 includes a transparent second Polyimide (PI), and the curing agent ratio, the curing temperature, and the like are controlled, so that the hardness of the first film layer 30 is greater than that of the second film layer 40, and the surface of the flexible display panel is resistant to impact or falling. In the 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 an external force or falls down, the protection strength of the first film layer 30 is greater. Specifically, the thickness of the first adhesive film layer 30 of the embodiment of the present application is 50nm, and the thickness of the second adhesive film layer 40 is 20 nm. 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 or 60 nm; the thickness of the second adhesive film layer 40 may be in the range of 15-25nm, for example, the thickness of the second adhesive film layer 40 is 15nm, 18nm, 22nm or 25 nm.

In a preferred embodiment of the present application, the buffer pillars 21 include a first buffer pillar 211 and a second buffer pillar 212, the height of the first buffer pillar 211 on the light-emitting display layer 10 is greater than the height of the second buffer pillar 212 on the light-emitting display layer 10, the height difference between the first buffer pillar 211 and the second buffer pillar 212 is greater than a threshold, and the first buffer pillar 211 and the second buffer pillar 212 are disposed in a staggered manner, wherein the threshold does not belong to an error value produced by the first buffer pillar 211 and the second buffer pillar 212, and the threshold is a predetermined certain value. In the embodiment of the present application, the buffer column 21 is a nano-column, and the height of the buffer column 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, or 20nm, etc. Specifically, in the embodiment of the present application, the height of the first buffer pillar 211 is 30nm, the height of the second buffer pillar 212 is 20nm, and the threshold is 10 nm. In the embodiment of the present application, the first buffer pillars 211 and the second buffer pillars 212 are disposed in a staggered manner, so that the buffer pillars 21 form uniform structures with different heights. For example, a plurality of first buffer pillars 211 form a first array of buffer pillars 211, a plurality of second buffer pillars 212 form a second array of buffer pillars 212, the first array of buffer pillars 211 and the second array of buffer pillars 212 are arranged in parallel, and the first buffer pillars 211 and the second buffer pillars 212 are arranged alternately. In other embodiments, the first buffer pillars 211 and the second buffer pillars 212 may be disposed in other types, and may be set according to the shape of the pixel definition layer 12 around the light emitting pixel unit 11. In the embodiment of the present application, the buffer wires 22 are connected between the adjacent first buffer posts 211 and the adjacent second buffer posts 212, so that a concave structure is formed between the adjacent first buffer posts 211 and the adjacent second buffer posts 212, and the first buffer posts 211 and the second buffer posts 212 are connected through the buffer wires 22, when an object collides with a local surface of the flexible display panel, the object first contacts with the first buffer posts 211 and slides down to the second buffer posts 212 through the buffer wires 22, so as to better buffer the force of the decomposed object, so that the force is counteracted in the direction parallel to the direction of the light emitting display layer 10 and the opposite direction of the elastic force of the buffer posts 21, thereby reducing the damage of the flexible display panel. In the embodiment of the present application, the buffer column 21 includes a first buffer column 211 and a second buffer column 212 having a height difference, in other embodiments, the buffer column 21 may include a first buffer column 211, a second buffer column 212 and a third buffer column having 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, and a better buffer effect is achieved, in other embodiments, the buffer column 21 may also be formed by buffer columns 21 having more than three height differences.

As a preferable solution of the embodiment of the present application, the pillar cross-sectional size of the buffer post 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 embodiment of the present application, the cross-sectional dimension of the column in the first direction D1 is gradually reduced by providing the buffer posts 21, such as the diameter of the cross-section, the distance of the diagonal of the cross-section, or the area of the cross-section. Reduce gradually through setting up buffering post 21 cross section size for when the object strikes to buffering post 21 on, because the cross-sectional area of cylinder reduces gradually, make the object easily along the surperficial landing of buffering post 21, make the object easily receive the buffering of buffering silk 22 and/or the lower buffering post 21 of height once more, reduce the harm to flexible display panel.

In the embodiment of the present application, as shown in fig. 9, the bottom end of the buffer post 21 is a quadrangle, and in other embodiments, the bottom end of the buffer post 21 may be a circle or a polygon such as a triangle, a pentagon, or a hexagon.

As a preferable mode of the embodiment of the present application, as shown in fig. 3, 5, 7 and 8, an end surface of the buffer post 21 away from one end of the light emitting display layer 10 is an arc-shaped curved surface, and the arc-shaped curved surface is curved toward one 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 buffering post 21 is the arc curved surface for when the flexible display panel was strikeed to the object, the object can receive the reverse elasticity that buffering post 21 gave, and the object can be followed the arc curved surface gliding on buffering post 21 top, and the arc curved surface can give the object and has 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 light-emitting display layer 10 may be a flat surface.

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 includes a pixel defining layer 12 and a light emitting pixel unit 11.

Step 200: a layer of transparent Polyimide (PI) is coated on one side of the display surface of the light-emitting display layer 10, a pattern is manufactured by controlling partial areas of a mask to be semi-transparent, fully transparent and opaque, and the buffer posts 21 with different heights are formed by utilizing the mask through an exposure process and etching to serve as buffer layers 20. In other embodiments, the material for forming the buffer layer 20 may also be transparent Photoresist (PR). Preferably, the buffer posts 21 are formed such that the projection of the light-emitting display layer 10 does not overlap with the light-emitting pixel cells 11, i.e., the buffer posts 21 are formed to face 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 posts 21 are softened by high-temperature pressing, the first polyimide is attached to the buffer layer 20, and a first film attaching layer 30 is formed along with the buffer posts 21 with different heights.

Further, the semi-transmissive region gradually changed between the semi-transmissive and the total-transmissive regions corresponding to the masks on which the buffer posts 21 having different heights are formed in step 200 is provided so that the buffer wires 22 are formed through the exposure process and through the reverse etching process. By controlling the semi-transparent area which changes gradually, the distance between the position where the buffer wire 22 is formed and the end of the buffer column 21 close to the light-emitting display layer 10 can be controlled to be one third to two thirds of the height of the buffer column 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 simple, and in other embodiments, the buffer wires 22 and the buffer posts 21 of the buffer layer 20 may be formed in other ways.

Step 200 is preceded by step 110: a transparent second Polyimide (PI) is coated on the display surface side of the light-emitting display layer 10 to form a second adhesive film layer 40. Step 300, coating a layer of transparent first Polyimide (PI), softening the first polyimide, the buffer layer 20 and the second polyimide film layer through high-temperature lamination, attaching the first polyimide to the buffer posts 21 through high-temperature lamination, and forming a first film attaching layer 30 along with the buffer posts 21 with different heights; the edges of the first polyimide and the second polyimide are attached 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 also be disposed on the edge regions of the first polyimide and the second polyimide, so that the first film-covering layer 30 and the second film-covering layer 40 are formed to seal the cavity 50.

The above description is only an embodiment of the present application, and not intended to limit the scope of the present application, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the specification and the drawings, or which are directly or indirectly applied to other related technical fields, are also included in the scope of the present application.

Claims

1. A flexible display panel, comprising:

a light emitting display layer;

the buffer layer comprises a plurality of buffer columns with different heights, and the buffer columns are dispersedly arranged on one side of the display surface of the light-emitting display layer;

the first film layer is attached to one side, away from the light-emitting display layer, of the buffer column.

2. The flexible display panel of claim 1, wherein a buffer wire is connected between a plurality of buffer posts with different heights, so that the buffer posts and the buffer wire form a buffer net stacked on the light emitting display layer.

3. The flexible display panel according to claim 2, wherein the buffer wires are disposed at a distance of one third to two thirds of the height of the buffer posts from the end of the buffer posts near the light-emitting display layer.

4. The flexible display panel of claim 1, wherein the light-emitting display layer comprises a plurality of light-emitting pixel units, and wherein the orthographic projection of the buffer posts on the light-emitting display layer does not overlap with the light-emitting pixel units.

5. The flexible display panel of claim 1, comprising a second adhesive layer between the buffer layer and the light emitting display layer.

6. The flexible display panel according to any one of claims 1 to 5, wherein the buffer pillars comprise a first buffer pillar and a second buffer pillar, a height of the first buffer pillar on the light-emitting display layer is greater than a height of the second buffer pillar on the light-emitting display layer, a height difference between the first buffer pillar and the second buffer pillar is greater than a threshold, and the first buffer pillar and the second buffer pillar are staggered, wherein the threshold is not an error value made by the first buffer pillar and the second buffer pillar.

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

8. The flexible display panel of claim 7, wherein an end surface of the buffer pillar away from the light-emitting display layer is an arc-shaped curved surface or a flat surface, and the arc-shaped curved surface is curved toward one side of the light-emitting display layer.

9. The flexible display panel of claim 5, wherein the first and second adhesive film layers are adhered at an edge region.

10. The flexible display panel of claim 1, comprising an encapsulation layer disposed between a light emitting display layer and the buffer layer.