CN108649146B - Preparation method of flexible display device - Google Patents
Preparation method of flexible display device Download PDFInfo
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- CN108649146B CN108649146B CN201810620384.5A CN201810620384A CN108649146B CN 108649146 B CN108649146 B CN 108649146B CN 201810620384 A CN201810620384 A CN 201810620384A CN 108649146 B CN108649146 B CN 108649146B
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- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000000758 substrate Substances 0.000 claims abstract description 138
- 239000011521 glass Substances 0.000 claims abstract description 104
- 238000004519 manufacturing process Methods 0.000 claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 239000010410 layer Substances 0.000 claims description 30
- 239000006260 foam Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 18
- 239000002390 adhesive tape Substances 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000004820 Pressure-sensitive adhesive Substances 0.000 claims description 6
- 239000000853 adhesive Substances 0.000 claims description 6
- 230000001070 adhesive effect Effects 0.000 claims description 6
- 239000012790 adhesive layer Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000004088 foaming agent Substances 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 238000005187 foaming Methods 0.000 claims 1
- 239000004973 liquid crystal related substance Substances 0.000 description 3
- 238000002834 transmittance Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000006261 foam material Substances 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000002318 adhesion promoter Substances 0.000 description 1
- 229920005601 base polymer Polymers 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003431 cross linking reagent Substances 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 239000002861 polymer material Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/133351—Manufacturing of individual cells out of a plurality of cells, e.g. by dicing
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K71/00—Manufacture or treatment specially adapted for the organic devices covered by this subclass
- H10K71/80—Manufacture or treatment specially adapted for the organic devices covered by this subclass using temporary substrates
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K77/00—Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
- H10K77/10—Substrates, e.g. flexible substrates
- H10K77/111—Flexible substrates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/549—Organic PV cells
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The invention discloses a preparation method of a flexible display device, which specifically comprises the following steps: forming a flexible display device layer on a large glass substrate; cutting the flexible display device layer to form a small flexible display unit; performing off-post operation on the small flexible display unit; wherein the large sheet of glass substrate is removed prior to the cutting of the flexible display device layer to form a small flexible display unit; after the flexible display device layer is cut and before the small flexible display unit is subjected to post operation, a small glass substrate is pasted on the back surface of the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit; after performing the down position operation, the small piece of glass substrate is removed. By adopting the technical scheme of the invention, the large-plate substrate glass substrate can be recycled, the usage amount of the large-plate substrate glass substrate is reduced, and the production cost of the display screen is reduced.
Description
Technical Field
The invention relates to the field of display devices, in particular to a preparation method of a flexible display device.
Background
At present, flexible display equipment such as curved-screen mobile phones and curved-surface televisions have very wide development prospects, and flexible LCDs are a follow-up novel development trend. However, the new technology also brings many new technical problems, wherein due to the thin and soft characteristics of the flexible material, the flexible material often deforms and has uncontrollable flatness during the manufacturing process of the display device, which seriously affects the whole process requirement, and results in the failure of normal production of the product. In order to solve the above problems, a substrate glass substrate with high transmittance and high flatness is generally used in the art to be adhered to the back surface of a flexible material, then a flexible display device is further fabricated on the flexible material, and after the subsequent processes are completed, the flexible material layer is separated from the substrate glass substrate.
In the existing flexible LCD mass production process, generally, after liquid crystal is filled, a glass substrate and the flexible LCD are directly cut together and flow into a post for operation, and after the post operation is finished, the glass substrate is removed. Therefore, the cut glass substrate is scrapped, and a substrate glass substrate needs to be selected again in the next batch of device preparation process, so that the glass substrate is greatly wasted. As is known, the adopted high-transmittance and high-flatness substrate glass substrate needs to maintain good optical, electrical, mechanical and machining properties, and is not cheap, and the utilization rate of the high-transmittance substrate glass substrate in the prior art is low, which not only causes waste of glass materials, but also increases the manufacturing cost of the display device.
Therefore, how to reduce the usage amount of the glass substrate and the production cost of the display screen becomes a technical problem to be solved urgently in the field of manufacturing the flexible display device.
Disclosure of Invention
The invention aims to provide a preparation method of a flexible display device, so that the utilization efficiency of a substrate glass substrate is improved, the usage amount of the glass substrate is reduced, and the production cost of a display screen is reduced.
In order to achieve the above object, an embodiment of the present invention provides a method for manufacturing a flexible display device, which specifically includes: forming a flexible display device layer on a large glass substrate; cutting the flexible display device layer to form a small flexible display unit; performing off-post operation on the small flexible display unit; wherein,
removing the large sheet of glass substrate before the cutting the flexible display device layer to form a small sheet of flexible display units;
after the flexible display device layer is cut and before the small flexible display unit is subjected to post operation, a small glass substrate is pasted on the back surface of the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit;
after performing the down position operation, the small piece of glass substrate is removed.
Further, the small flexible display unit is adhered to the small glass substrate through a foam adhesive tape, and the foam adhesive tape is a heating peelable foam adhesive tape.
Further, the post operation comprises at least one of the following operations: cleaning, binding IC, binding FPC and sticking polaroid.
Further, the small piece of glass substrate has a length and/or width greater than a length and/or width of the small piece of flexible display unit.
Further, the large glass substrate and the small glass substrate are made of the same material, and the material comprises alkali-free glass.
Furthermore, the thickness of the large glass substrate and the small glass substrate is 0.4-0.7 mm.
Further, after the small flexible display unit is attached to the small glass substrate by a foam tape, attached air bubbles are removed using a vacuum bubble remover.
Further, the removing the small piece of the glass substrate includes peeling off the foam tape by heating.
The embodiment of the invention also provides an application of the glass substrate in a preparation method of a flexible display device, and particularly the small glass substrate is used for being adhered to the back surface of a small flexible display unit after a flexible display device layer is cut to form the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit.
Further, the method of manufacturing a flexible display device is the method of manufacturing a flexible display device according to any one of the preceding claims.
The invention has the following advantages: according to the preparation method of the flexible display device, the flexible display device layer is formed on the large glass substrate; cutting the flexible display device layer to form a small flexible display unit; performing off-post operation on the small flexible display unit; wherein the large sheet of glass substrate is removed prior to the cutting of the flexible display device layer to form a small flexible display unit; after the flexible display device layer is cut and before the small flexible display unit is subjected to post operation, a small glass substrate is pasted on the back surface of the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit; removing the small glass substrate after performing the post operation; therefore, the problem that the substrate glass substrate used by a large-sized flexible display device is cut after being used once is well solved, the substrate glass substrate can be recycled, the use amount of the glass substrate is reduced, and the production cost of the display screen is reduced.
Drawings
Fig. 1 is a schematic flow chart of a method for manufacturing a flexible display device according to an embodiment of the present invention;
FIG. 2 is a top view of a large panel flexible display device in accordance with an embodiment of the present invention;
FIG. 3 is a top view of a diced flexible display unit according to an embodiment of the invention after dicing;
FIG. 4 is a cross-sectional view of a small piece of flexible display unit according to an embodiment of the present invention after being attached to a small piece of glass substrate;
FIG. 5 is a schematic structural diagram of a small flexible display unit according to an embodiment of the present invention after post-operation;
fig. 6 is a schematic structural diagram of a small flexible display unit with a small glass substrate removed after post-operation according to an embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
The embodiment of the invention provides a preparation method of a flexible display device, which comprises the following steps as shown in figure 1:
The material of the large glass substrate may include alkali-free glass having a thickness of 0.4 to 0.7 mm. The flexible display unit 1 may be an OLED display device layer or an LCD display device layer. Generally, the basic structure of the OLED display device layer comprises a flexible substrate formed on the large glass substrate, and a first electrode layer, an organic light emitting layer, a second electrode layer and an encapsulation protective film which are sequentially formed on the flexible substrate; the LCD device layer comprises a flexible array substrate formed on the large glass substrate, a flexible color film substrate formed on the other large glass substrate, liquid crystals which are oppositely aligned and attached to the flexible array substrate and the flexible color film substrate through sealing glue and are arranged in a cavity formed by the flexible array substrate, the flexible color film substrate and the sealing glue in a surrounding mode.
The thicknesses of the flexible substrate, the flexible color film substrate and the flexible substrate of the flexible array substrate are usually 50 μm to 100 μm; the material is typically an organic polymer material such as PI, TAC, or the like.
Step 2, removing the large glass substrate, and cutting a plurality of small flexible display units 1 from the large flexible display device along a precut line, as shown in fig. 3; the small piece of flexible display unit 1 is adhered to the small piece of glass substrate 2 by a foam tape 3, and the foam tape 3 is a heat peelable foam tape 3, as shown in fig. 4.
In the present embodiment, the large glass substrate is removed before the large flexible display device is cut to form the small flexible display unit 1; then, the large-panel flexible display device is cut to obtain a plurality of small flexible display units 1. Therefore, the cutting step does not damage the large glass substrate, and the whole glass substrate can be recycled after being removed.
Due to the thin and soft characteristics of the flexible material, the flexible material is often deformed and the flatness of the flexible material cannot be controlled in the production and preparation process of the display device, so that a substrate glass substrate with high permeability and high flatness is required to be adhered to the back surface of the small flexible display unit 1 to serve as a substrate, a flexible display device layer is supported, and subsequent processes can be conveniently performed on the small flexible display unit 1. Namely, in order to ensure that the cut small flexible display unit 1 can still be normally produced in the post-operation, the method provided by the embodiment of the invention further comprises the following steps: after the large-board flexible display device is cut, and before the small flexible display unit 1 is subjected to post operation, a small glass substrate 2 is pasted on the back surface of the small flexible display unit 1, and the size of the small glass substrate 2 is not smaller than that of the small flexible display unit 1.
As shown in fig. 3, the diced small flexible display unit 1 of the present invention, which takes an LCD display device as an example, includes: the flexible color film substrate comprises a flexible array substrate 11 and a flexible color film substrate 12 which are attached in an aligned mode, wherein a binding area 13 is formed in the area, wider than the flexible color film substrate, of the flexible array substrate and is used for binding a driver IC14 and an FPC 15. It should be noted that the small flexible display unit 1 further includes a sealant and a liquid crystal, which are all shown in the figure.
The small glass substrate 2 can be made of the same material as the large glass substrate, i.e. the small glass substrate 2 can also be made of alkali-free glass and has a thickness of 0.4-0.7 mm. In order to better support the cut small flexible display unit 1 and ensure that the cut small flexible display unit 1 is smoothly operated in a post-operation process, the size of the small glass substrate 2 needs to be matched with the size of the small flexible display unit 1. Namely, the size of the small piece of glass substrate 2 is not smaller than the size of the small piece of flexible display unit 1; furthermore, the length and/or width of the small glass substrate 2 is larger than the length and/or width of the small flexible display unit 1, so that alignment bonding is facilitated, influence on the flatness of the small flexible display unit 1 after dislocation bonding is avoided, and a supporting effect is better played for the small flexible display unit 1.
Furthermore, the thickness of the foam adhesive tape 33 is 100 μm to 200 μm, and the tolerance of the adhesive thickness is within 10 μm.
And 3, performing post operation on the small flexible display unit 1 adhered with the small glass substrate 2, and removing the small glass substrate 2 by heating after the post operation is finished. Wherein the post operation includes and is not limited to at least one of the following operations: cleaning, bonding the IC, bonding the FPC15, and attaching the polarizer 16, as shown in FIG. 5.
In this embodiment, the flexible array substrate of the small flexible display unit 1 is aligned and attached to the small glass substrate 2 through the foam tape 3, and then the post operation is performed. After the post operation is finished, finally, the small glass substrate 2 is removed. Specifically, by heating the foam tape 3, the foam material expands when heated for the purpose of detachment, thereby facilitating clean removal of the small glass substrate 2.
As shown in fig. 6, the small piece flexible display unit 1 of this step includes: the flexible color film substrate comprises a flexible array substrate 11 and a flexible color film substrate 12 which are attached in an aligned mode, wherein the area, wider than the flexible color film substrate 12, of the flexible array substrate 11 is a binding area 13 used for binding a driving IC14 and an FPC15, and the flexible color film substrate further comprises an upper polarizer 16 attached to the flexible color film substrate 12.
Note that after the small piece of flexible display unit 1 is attached to the small piece of glass substrate 2 by the foam tape 3, the attached bubbles are removed using a vacuum defoaming machine. The heating peelable foam adhesive tape 3 mainly utilizes the expansion principle of the foam material in the adhesive tape during heating to achieve the purpose of separation. Here, it should be understood that the choice of the adhesive between the small piece of flexible display unit 1 and the small piece of glass substrate 2 is crucial, since the flexible display device layer (i.e. the cut small piece of flexible display unit 1) needs to be adhered to the small piece of glass substrate 2 and then removed; the performance requirements for the adhesive on the back of the small flexible display unit 1 are therefore very high, requiring both tack for proper handling when adhered and non-tack, quick peel, no residue when removed.
The foam adhesive tape 3 used in the embodiment of the invention has the performance of automatically releasing within 1 minute at the high temperature of 80-100 ℃ so as to ensure that the glass substrate can be normally removed after the product is bound with the driving IC14 and the FPC15 and is attached with the polarizer 16. Preferably, but not limited to, the heat-peelable foam tape 3 of the embodiment of the present invention is formed with a foaming agent-containing foam on at least one surface of a base material, and has a shear elastic modulus (23 ℃) of 7 × 10 in an unfoamed state6A heat-peelable pressure-sensitive adhesive sheet having a heat-expandable pressure-sensitive adhesive layer of Pa or more, wherein the heat-expandable pressure-sensitive adhesive layer has a shear elastic modulus (23 ℃) of less than 7X 106A bonding layer of Pa; in particular toThe thermal expansion adhesive layer has a shear elastic modulus (23 ℃) of 7X 10 after curing or drying6Pa or more, and a heat-expandable adhesive layer formed on the heat-expandable adhesive layer and having a shear elastic modulus (23 ℃) of less than 7X 10 after curing or drying6Pa of binder formation. The shear elastic modulus of the adhesive constituting the heat-expandable adhesive layer can be adjusted by the kind or content of a base polymer or an additive (a crosslinking agent, an adhesion promoter, or the like) in the adhesive, the kind or content of a foaming agent (a heat-expandable pellet, or the like).
It is worth noting that the small glass substrate 2 is used for supporting the small cut flexible display unit 1 to perform post operation, so that the problem that the substrate glass substrate used by a large flexible LCD is cut after being used once is well solved, the substrate glass substrate can be recycled, the use amount of the glass substrate is reduced, and the production cost of the display screen is reduced. The requirement on the whole flatness is very high in each production operation link of the post, the flatness is usually required to be below 10 μm, but the small flexible display unit 1 has very serious deformation degree due to product characteristics and cannot meet the requirement at all, so that the requirement on the whole process is influenced, and the product cannot be produced normally. By adopting the technical scheme of the invention, the small flexible display unit 1 can be ensured to be always in a high-flatness state in the post operation process, and the problem that the small flexible display unit 1 cannot be normally produced due to the deformation degree is avoided.
The embodiment of the invention also provides an application of the glass substrate in a preparation method of a flexible display device, and particularly the small glass substrate is used for being adhered to the back surface of a small flexible display unit after a flexible display device layer is cut to form the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit.
Further, the preparation method of the flexible display device is suitable for the preparation method of the flexible display device.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (4)
1. A method of manufacturing a flexible display device, comprising: forming a flexible display device layer on a large glass substrate; cutting the flexible display device layer to form a small flexible display unit; performing off-post operation on the small flexible display unit; the method is characterized in that:
removing the large sheet of glass substrate before the cutting the flexible display device layer to form a small sheet of flexible display units;
after the flexible display device layer is cut and before the small flexible display unit is subjected to post operation, a small glass substrate is pasted on the back surface of the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit;
removing the small glass substrate after performing the post operation;
the small flexible display units are adhered to the small glass substrates through foam tapes, and the foam tapes are heating peelable foam tapes;
the length of the small glass substrate is larger than that of the small flexible display unit, the width of the small glass substrate is larger than that of the small flexible display unit, the length of the small glass substrate is larger than that of the small flexible display unit, and the width of the small glass substrate is larger than that of the small flexible display unit;
the large glass substrate and the small glass substrate are made of the same material, and the material comprises alkali-free glass;
the thickness of the large glass substrate and the small glass substrate is 0.4-0.7 mm;
the removing the small glass substrate comprises peeling off the foaming adhesive tape by heating;
the thickness of the foam adhesive tape is 100-200 mu m, the adhesive thickness tolerance is within 10 mu m, and the foam adhesive tape has the performance of automatic separation within 1 minute at the high temperature of 80-100 ℃;
the foam adhesive tape comprises a base material and, formed on at least one surface thereof, a foaming agent, wherein the shear modulus of elasticity of the foam adhesive tape in an unfoamed state is 7 x 10 at 23 DEG C6A heat-peelable pressure-sensitive adhesive sheet having a heat-expandable pressure-sensitive adhesive layer of Pa or more, wherein the heat-expandable pressure-sensitive adhesive layer has a shear elastic modulus of less than 7X 10 at 23 DEG C6Pa of an adhesive layer.
2. A method of manufacturing a flexible display device according to claim 1, wherein the downstairs operation comprises at least one of: cleaning, binding IC, binding FPC and sticking polaroid.
3. The method of manufacturing a flexible display device according to claim 1, wherein after the small piece of flexible display unit is attached to the small piece of glass substrate by a foam tape, attached air bubbles are removed using a vacuum bubble remover.
4. The application of the glass substrate in the preparation method of the flexible display device is characterized in that: the small glass substrate is used for being adhered to the back surface of the small flexible display unit after the flexible display device layer is cut to form the small flexible display unit, and the size of the small glass substrate is not smaller than that of the small flexible display unit; a method of manufacturing a flexible display device according to any one of claims 1 to 3.
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| CN111179756B (en) * | 2020-01-03 | 2022-07-26 | 京东方科技集团股份有限公司 | Composite foam, flexible OLED display panel and display device |
| CN111312786B (en) * | 2020-02-28 | 2022-11-15 | 云谷（固安）科技有限公司 | Flexible display panel and preparation method thereof |
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