CN110931527A - Flexible display panel, manufacturing method thereof and flexible display terminal - Google Patents
Flexible display panel, manufacturing method thereof and flexible display terminal Download PDFInfo
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- CN110931527A CN110931527A CN201911166240.8A CN201911166240A CN110931527A CN 110931527 A CN110931527 A CN 110931527A CN 201911166240 A CN201911166240 A CN 201911166240A CN 110931527 A CN110931527 A CN 110931527A
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/122—Pixel-defining structures or layers, e.g. banks
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/84—Passivation; Containers; Encapsulations
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Abstract
The invention provides a flexible display panel which is characterized in that the flexible display panel is divided into a bending area and a non-bending area; the flexible display panel includes: an array substrate; the array substrate comprises a plurality of display light-emitting units and a pixel limiting layer, wherein the display light-emitting units and the pixel limiting layer are arranged on the array substrate, the pixel limiting layer comprises a plurality of pixel isolating columns, and the display light-emitting units are positioned between two adjacent pixel isolating columns; a thin film encapsulation layer covering the plurality of display light emitting units and the pixel defining layer; and a plurality of pixel supporting columns arranged between the pixel limiting layer positioned in the non-bending area and the thin film packaging layer positioned in the non-bending area. The pixel support columns in the bending areas are cancelled, so that friction between the mask plate in the bending areas and the pixel support columns is avoided, the probability of damage of the pixel support columns in the bending areas is effectively reduced, the pixel support columns are prevented from bursting a thin film packaging layer in the dynamic bending process of the screen body, and the bending resistance and the reliability of the bending areas are improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel, a manufacturing method thereof and a flexible display terminal.
Background
With the continuous development of flexible display technology, users have higher and higher requirements on the bending resistance and reliability of flexible display products. In the dynamic bending process of the flexible display panel, a pixel support column (SPC, Spacer) located in a bending area easily breaks a thin film packaging layer, and further causes bad display phenomena such as black spots and the like, and affects the reliability of the display panel.
Disclosure of Invention
In view of this, embodiments of the present invention provide a flexible display panel to solve the technical problem in the prior art that a pixel support pillar in a bending region of the flexible display panel easily breaks a thin film encapsulation layer, which causes a display defect phenomenon such as a black spot on a screen body.
According to an aspect of the present invention, an embodiment of the present invention provides a flexible display panel, which is divided into a bending region and a non-bending region; the flexible display panel includes: an array substrate; the array substrate comprises a plurality of display light-emitting units and a pixel limiting layer, wherein the display light-emitting units and the pixel limiting layer are arranged on the array substrate, the pixel limiting layer comprises a plurality of pixel isolating columns, and the display light-emitting units are positioned between two adjacent pixel isolating columns; a thin film encapsulation layer covering the plurality of display light emitting units and the pixel defining layer; and a plurality of pixel supporting columns arranged between the pixel limiting layer positioned in the non-bending area and the thin film packaging layer positioned in the non-bending area.
In one embodiment, the plurality of pixel support columns correspond one-to-one to the plurality of pixel isolation columns.
In one embodiment, the plurality of pixel support posts are arranged in an array.
In one embodiment, an orthographic projection area of the pixel support pillars on the array substrate is smaller than an orthographic projection area of the pixel isolation pillars on the array substrate.
In one embodiment, the thickness of the pixel support post is greater than or equal to 0.5 μm and less than or equal to 1 μm.
In one embodiment, the material of the pixel support column is organic glue.
In one embodiment, one surface of the pixel support column, which is in contact with the thin film encapsulation layer, is arc-shaped.
According to another aspect of the present invention, a method for manufacturing a flexible display panel is provided,
the flexible display panel is divided into a bending area and a non-bending area; the manufacturing method comprises the following steps: providing an array substrate; preparing a plurality of display light-emitting units and a pixel limiting layer on the array substrate, wherein the pixel limiting layer comprises a plurality of pixel isolation columns, and a plurality of pixel supporting columns are prepared on the pixel isolation columns in the non-bending area; preparing a display light-emitting unit between two adjacent pixel isolation columns; and preparing a thin film encapsulation layer on the pixel defining layer, the plurality of display light emitting units, and the plurality of pixel supporting pillars.
In one embodiment, the preparing a plurality of pixel support pillars on the pixel defining layer located in the non-bending region includes: the pixel isolation columns in the non-bending areas are arranged in one-to-one correspondence with the pixel support columns.
According to still another aspect of the present invention, an embodiment of the present invention provides a flexible display terminal, including: the flexible display panel of any of the preceding.
According to the flexible display panel provided by the embodiment of the invention, the pixel supporting columns are arranged between the pixel limiting layer positioned in the non-bending area and the film packaging layer positioned in the non-bending area, so that the pixel supporting arranged between the pixel limiting layer positioned in the bending area and the film packaging layer positioned in the bending area is cancelled, and the bending property and the reliability of the bending area are ensured. Because the bending radius of the screen body is very small, even if the pixel supporting columns in the bending area of the screen body are eliminated, the pixel supporting columns in the non-bending area can still support the whole mask, and the evaporation effect is not influenced. In addition, the setting of the pixel support column in the bending area is cancelled, so that the friction between the mask plate in the bending area and the pixel support column is avoided, the probability of unsmooth damage and the like of the pixel support column in the bending area is effectively reduced, the phenomenon that the thin film packaging layer is broken by the pixel support column which is damaged and unsmooth damage and the like in the dynamic bending process of the screen body is avoided, and the reliability of the bending area is improved.
Drawings
Fig. 1 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention.
Fig. 2 is a schematic flow chart illustrating a method for manufacturing a flexible display panel according to an embodiment of the present invention.
Detailed Description
As described in the background art, in the prior art, a pixel support column in a bending region of a flexible display panel is prone to break through a thin film encapsulation layer, which causes a display defect phenomenon such as a black spot on a screen body. The reason why such a problem occurs is as follows. In the manufacturing process of the existing flexible display panel, a plurality of pixel supporting columns are arranged on a pixel limiting layer and used for supporting a mask plate, and organic light-emitting materials are evaporated in a region enclosed by the pixel isolating columns from an opening of the mask plate to form a display light-emitting layer. The contact of the pixel supporting column and the mask inevitably causes the pixel supporting column to be damaged such as unsmooth, the pixel supporting column is damaged such as unsmooth, the coverage of the thin film packaging layer is poor, the reliability of the thin film packaging layer is reduced, and the reliability of the flexible display panel is further influenced. In addition, in the dynamic bending process of the flexible display panel, the pixel support columns which are located in the bending area and are damaged, such as unsmooth pixel support columns, are forced to advance towards the direction of the film packaging layer by extrusion force, so that the film packaging layer is easily burst, the packaging failure is caused, and further the display panel has bad display phenomena such as black spots and the like, and the reliability of the display panel is influenced.
In order to solve the above problems, the inventors have studied and found that, by providing the pixel support columns only between the pixel defining layer located in the non-bending region and the thin film encapsulation layer located in the non-bending region and by eliminating the pixel support columns provided between the pixel defining layer located in the bending region and the thin film encapsulation layer located in the bending region, the bendability and reliability of the bending region can be ensured. Because the bending radius of the screen body is very small, the area of the bending area is small enough, even if the pixel supporting columns of the bending area of the screen body are cancelled, the pixel supporting columns of the non-bending area can still support the whole mask, and the evaporation effect is not influenced. In addition, the pixel support columns in the bending areas are cancelled, so that friction between the mask and the pixel support columns in the bending areas is avoided, the probability of damage phenomena such as unsmooth phenomena and the like of the pixel support columns in the bending areas is effectively reduced, the phenomenon that the thin film packaging layer is broken by the damaged pixel support columns such as unsmooth phenomena and the like in the dynamic bending process of the screen body is avoided, and the reliability of the bending areas is improved.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Fig. 1 is a schematic structural diagram of a flexible display panel according to an embodiment of the present invention. As shown in fig. 1, the flexible display panel is divided into a bending region and a non-bending region; the flexible display panel includes: an array substrate 1; the display light-emitting device comprises a plurality of display light-emitting units 2 and a pixel limiting layer 3, wherein the display light-emitting units 2 and the pixel limiting layer 3 are arranged on an array substrate 1, the pixel limiting layer 3 comprises a plurality of pixel isolation columns 31 which are arranged at intervals, and the display light-emitting units 2 are positioned between two adjacent pixel isolation columns 31; a thin film encapsulation layer 4 covering the plurality of display light emitting units 2 and the pixel defining layer 3; and a plurality of pixel support columns 5 disposed between the pixel defining layer 3 located at the non-bending region and the thin film encapsulation layer 4 located at the non-bending region.
In the embodiment of the invention, the arrangement of the pixel support columns 5 in the bending region is cancelled, so that the friction between the mask in the bending region and the pixel support columns 5 is avoided, the probability of unsmooth and other damages of the pixel support columns 5 in the bending region is effectively reduced, the unsmooth and other damages of the pixel support columns 5 are further avoided from bursting the thin film packaging layer 4 in the dynamic bending process of the screen body, and the reliability of the bending region is improved. In addition, because the bending radius of the screen body is very small, even if the pixel support columns 5 in the bending area of the screen body are eliminated, the pixel support columns 5 in the non-bending area can still support the whole mask, the evaporation effect is not influenced, and the material can be saved.
It should be understood that the flexible display panel is divided into a bending region and a non-bending region, the bending region refers to a region where the flexible display device of the flexible display panel is bent and stretched when bent, and the non-bending region refers to a region where the flexible display device of the flexible display panel is not bent when bent. The bending area and the non-bending area can be divided according to different types of flexible display panels and different application scenes, and the specific division of the bending area and the non-bending area is not limited in the embodiment of the invention.
It should also be understood that the array substrate 1 may be a substrate including a substrate and a Thin Film Transistor (TFT) layer disposed on the substrate. Of course, the substrate may further include a multi-layer structure of a planarization layer, a passivation layer, and other film layers, and the specific structure of the array substrate 1 is not limited in the embodiment of the present invention. The thin film encapsulation layer 4 may be a multilayer structure including an organic layer and an inorganic layer stacked in sequence, and the specific structure of the thin film encapsulation layer 4 is not limited in the embodiment of the present invention.
The display light emitting unit 2 includes a cathode and an anode, and an organic light emitting layer between the cathode and the anode, and the organic light emitting layer may include a Hole Injection Layer (HIL), a Hole Transport Layer (HTL), an organic material light emitting layer (EML), an Electron Transport Layer (ETL), and an Electron Injection Layer (EIL) which are sequentially stacked. The display light emitting unit 2 is only required to realize display light emission, and the specific structure of the display light emitting unit 2 is not limited in the present invention.
The pixel defining layer 3 includes a plurality of pixel isolation pillars 31, and an area surrounded by the pixel isolation pillars 31 is used to prepare an organic light emitting unit. During manufacturing, an organic material in an evaporation source is evaporated to a region surrounded by the pixel isolation pillar 31 through a hollow pattern on an evaporation mask (for example, a fine metal mask FMM), so as to form an organic light emitting layer; in the evaporation process, the pixel support columns 5 support the evaporation mask so as to ensure the normal manufacture of the organic light-emitting layer. Because the mask is of a whole structure, the pixel support columns 5 in the bending region of the screen body are omitted, and the pixel support columns 5 in the non-bending region can still support the whole mask, so that the evaporation effect is not influenced, and the material can be saved.
The pixel support pillars 31 may be formed by evaporation, deposition, inkjet printing, or other processes, and the specific manufacturing process of the pixel isolation pillars 31 is not limited in the embodiment of the present invention. The pixel support columns 31 may be cylinders or cubes, and the embodiment of the present invention does not limit the specific shapes of the pixel support columns.
In one embodiment, the plurality of pixel support columns 5 are disposed in one-to-one correspondence with the plurality of pixel isolation columns 31. The pixel support columns 5 in the non-bending region correspond to the pixel isolation columns 31 one by one, and effectively support the mask plate, so that the organic material is evaporated in the region formed by the pixel isolation columns 31 in a surrounding mode.
In a further embodiment, a plurality of pixel support posts 5 are arranged in an array. Because only set up pixel support column 5 in the regional pixel support column 5 that does not buckle, the regional pixel support column 5 of non-buckling is array and arranges, and in flexible display panel bending process, the regional pixel support column 5 of non-buckling can be even to the power of top film packaging layer 4, avoids film packaging layer 4 a certain department atress too big production to tear. In addition, because pixel support columns 5 and pixel isolation columns 31 one-to-one, pixel support columns 5 are arranged in an array, pixel isolation columns 31 are also arranged in an array, and display light-emitting units 2 are also arranged in an array, and in the evaporation process, the support force of pixel isolation columns 31 arranged in an array to each part of the mask is relatively uniform, which is beneficial to improving the evaporation effect, and further ensures that the display effect of the flexible panel is more uniform.
In one embodiment, the forward projection area of the pixel support posts 5 on the array substrate 1 is smaller than the forward projection area of the pixel isolation posts 31 on the array substrate 1. The larger the area of the pixel supporting column 5 is, the smaller the pressure intensity received by the thin film packaging layer 4 is when the flexible display panel is bent, and the better the packaging effect is. However, the orthographic projection size of the pixel support pillars 5 on the array substrate 1 is smaller than the orthographic projection size of the pixel isolation pillars 31 on the array substrate 1, otherwise, the deposition of the organic light emitting layer is affected, and the display light emitting effect of the flexible display panel is affected.
In one embodiment, the thickness of the pixel support posts 5 is 0.5 μm or more and 1 μm or less. The pixel support column 5 is too thin to play a role in supporting the mask; the pixel support columns 5 are too thick, because the pixel support columns 5 are not arranged in the bending regions, the mask in the bending regions is easy to collapse, and the pixel support columns 5 are too thick, although the bending stress suffered by the non-bending regions is small, the pixel support columns 5 in the non-bending regions are easy to burst the thin film packaging layer 4. The thickness of the pixel supporting column 5 is set in the range, the mask of the bending region is not easy to collapse, the packaging stability of the non-bending region is not influenced, in addition, the pixel supporting column 5 is embedded in the thin film packaging layer 4, the thicker the thickness of the pixel supporting column 5 is, the easier the fulcrum effect is formed at the contact position of the pixel supporting column 5 and the thin film packaging layer 4, so in the bending process, the thicker the thickness of the pixel supporting column 5 of the non-bending region close to the bending region part is, the stronger the fulcrum effect is, the separation of the thin film packaging layer 4 and the pixel supporting column 5 can be accelerated, therefore, the thickness of the pixel supporting column 5 is set to be more than or equal to 0.5 mu m and less than or equal to 1 mu m, the bending reliability of the flexible display panel is ensured, and meanwhile, the improvement of the adhesive force.
In one embodiment, the material of the pixel support posts 5 is an organic glue. The organic glue is easy to obtain, the preparation process is mature, and the economic cost is low.
In one embodiment, the side of the pixel support posts 5 in contact with the thin film encapsulation layer 4 is arc-shaped. One side of the pixel support column 5 in contact with the thin film package is set to be arc-shaped, so that the pivot effect between the pixel support column 5 and the thin film package layer 4 is reduced, the film separation between the pixel support column 5 and the thin film package layer 4 due to the pivot effect is reduced or avoided, and the film separation of a bending area is reduced. The stability and the bending resistance of the flexible display panel are effectively improved.
Fig. 2 is a schematic flow chart illustrating a method for manufacturing a flexible display panel according to another aspect of the present invention. As shown in fig. 2, the manufacturing method includes the following steps.
Step 201: providing an array substrate;
step 202: preparing a plurality of display light-emitting units and a pixel limiting layer on an array substrate, wherein the limiting layer comprises a plurality of pixel isolation columns arranged at intervals;
step 202: preparing a plurality of pixel supporting columns on the pixel isolation columns in the non-bending area;
step 203: preparing a display light-emitting unit between two adjacent pixel isolation columns;
step 204: preparing a thin film encapsulation layer on the pixel defining layer, the plurality of display light emitting units, and the plurality of pixel supporting pillars.
In the embodiment of the invention, the pixel supporting columns are only prepared on the pixel limiting layer positioned in the non-bending area, the preparation of the pixel supporting columns on the pixel limiting layer in the bending area is cancelled, the mask plate in the bending area is prevented from rubbing with the pixel supporting columns, the probability of unsmooth and other damages of the pixel supporting columns in the bending area is effectively reduced, the unsmooth and other damages of the pixel supporting columns are further prevented from bursting through the thin film packaging layer in the dynamic bending process of the screen body, and the reliability of the bending area is improved.
As shown in fig. 2, step 202: and preparing a pixel support pillar on the pixel isolation pillar in the non-bending area. The pixel supporting columns are prepared on the pixel isolation columns in the non-bending areas, so that the pixel supporting columns in the non-bending areas can be used for supporting the whole mask, evaporation of the organic light emitting layer is not affected, and bending resistance and stability of the bending areas can be improved.
In the embodiment of the invention, the flexible display panel is adopted to construct the flexible display terminal, so that the bending resistance of a bending area of the flexible display terminal is enhanced, and the bad display phenomena of black spots and the like of a screen body caused by the fact that a pixel supporting column breaks a thin film packaging layer when the flexible display terminal is bent are reduced. Therefore, the bending resistance and stability of the flexible display terminal are improved, and the service life of the display terminal is prolonged.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (10)
1. A flexible display panel is characterized in that the flexible display panel is divided into a bending area and a non-bending area; the flexible display panel includes:
an array substrate;
the array substrate comprises a plurality of display light-emitting units and a pixel limiting layer, wherein the display light-emitting units and the pixel limiting layer are arranged on the array substrate, the pixel limiting layer comprises a plurality of pixel isolation columns which are arranged at intervals, and the display light-emitting units are positioned between two adjacent pixel isolation columns;
a thin film encapsulation layer covering the plurality of display light emitting units and the pixel defining layer; and
and the pixel support columns are arranged between the pixel limiting layer positioned in the non-bending area and the thin film packaging layer positioned in the non-bending area.
2. The flexible display panel of claim 1, wherein the plurality of pixel support posts are disposed in one-to-one correspondence with the plurality of pixel isolation posts.
3. The flexible display panel of claim 2, wherein the plurality of pixel support posts are arranged in an array in the non-bending region.
4. The flexible display panel of claim 1, wherein an area of an orthographic projection of the pixel support pillars on the array substrate is smaller than an area of an orthographic projection of the pixel isolation pillars on the array substrate.
5. The flexible display panel of claim 1, wherein the pixel support posts have a thickness of 0.5 μ ι η or more and 1 μ ι η or less.
6. The flexible display panel of claim 1, wherein the pixel support posts are made of an organic glue.
7. The flexible display panel of claim 1, wherein a surface of the pixel support posts in contact with the thin film encapsulation layer is curved.
8. The manufacturing approach of a flexible display panel, characterized by, the said flexible display panel is divided into bending area and non-bending area; the manufacturing method comprises the following steps:
providing an array substrate;
preparing a pixel defining layer on the array substrate, wherein the defining layer comprises a plurality of pixel isolation columns arranged at intervals;
preparing a plurality of pixel supporting columns on the pixel isolation columns in the non-bending area;
preparing a display light-emitting unit between two adjacent pixel isolation columns; and
preparing a thin film encapsulation layer on the pixel defining layer, the plurality of display light emitting units, and the plurality of pixel supporting pillars.
9. The method of manufacturing a flexible display panel according to claim 8,
preparing a plurality of pixel supporting columns on the pixel isolation columns in the non-bending areas, wherein the pixel supporting columns comprise: the pixel isolation columns in the non-bending areas are arranged in one-to-one correspondence with the pixel support columns.
10. A flexible display terminal, comprising: the flexible display panel of any one of claims 1-7.
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| CN201911166240.8A CN110931527A (en) | 2019-11-25 | 2019-11-25 | Flexible display panel, manufacturing method thereof and flexible display terminal |
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| CN201911166240.8A CN110931527A (en) | 2019-11-25 | 2019-11-25 | Flexible display panel, manufacturing method thereof and flexible display terminal |
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Cited By (1)
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Application publication date: 20200327 |