CN109166890B - Flexible display panel, preparation method thereof and flexible display device - Google Patents
Flexible display panel, preparation method thereof and flexible display device Download PDFInfo
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- CN109166890B CN109166890B CN201810998292.0A CN201810998292A CN109166890B CN 109166890 B CN109166890 B CN 109166890B CN 201810998292 A CN201810998292 A CN 201810998292A CN 109166890 B CN109166890 B CN 109166890B
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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
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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
Abstract
The invention discloses a flexible display panel, a preparation method thereof and a flexible display device, wherein the flexible display panel comprises: the positive voltage electric film layer, the first insulating material layer and the second insulating material layer; the positive piezoelectric film layer is formed between the first insulating material layer and the second insulating material layer, and when the flexible display panel is bent, the positive piezoelectric film layer converts stress generated by deformation of the positive piezoelectric film layer into electric energy. By forming the positive voltage thin film layer, internal stress of the flexible display panel during bending can be reduced, which is helpful for improving the bending resistance and display performance of the flexible display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a flexible display panel, a preparation method thereof and a flexible display device.
Background
Organic light-emitting diodes (OLEDs) have the advantages of self-luminescence, wide viewing angle, low power consumption and the like, OLED devices can be used as light-emitting elements of a display panel to manufacture an OLED display panel, and a substrate in the OLED display panel can be a flexible substrate to manufacture the flexible display panel.
The flexible OLED display panel is easy to bend in the production and use processes, when the flexible OLED display panel is bent, stress can be generated on the layer structure of the flexible OLED display panel, and the display performance of the flexible OLED display panel can be influenced after the flexible OLED display panel is bent for multiple times, so that the problem that how to reduce the stress generated when the flexible OLED display panel is bent needs to be solved.
Disclosure of Invention
The invention provides a flexible display panel, a preparation method thereof and a flexible display device, which aim to overcome the defects in the related art.
According to a first aspect of embodiments of the present invention, there is provided a flexible display panel including:
the piezoelectric film comprises a positive piezoelectric film layer, a first insulating material layer and a second insulating material layer, wherein the positive piezoelectric film layer is a film layer comprising a material with a positive piezoelectric effect;
the positive piezoelectric film layer is formed between the first insulating material layer and the second insulating material layer, and when the flexible display panel is bent, the positive piezoelectric film layer converts stress generated by deformation of the positive piezoelectric film layer into electric energy.
Optionally, the method further includes:
the first insulating material layer is a first flexible substrate, and the second insulating material layer is a second flexible substrate.
Optionally, the method further includes:
a third flexible substrate;
an organic display function layer, the first insulating material layer, the positive piezoelectric thin film layer and the second insulating material layer are sequentially formed on the third flexible substrate;
the first insulating material layer is a thin film packaging layer, and the second insulating material layer is an optical adhesive layer.
Optionally, the positive voltage film layer is a transparent positive voltage film layer.
Optionally, the material of the positive piezoelectric thin film layer includes a material having a positive voltage effect, and the material having the positive piezoelectric effect is any one of or a combination of any two or more of polyvinylidene fluoride, a polymer material containing an epoxy resin matrix, a polymer material containing a polyvinyl chloride matrix, a polymer material containing a polyurethane matrix, or a material containing an organic silicon polymer matrix.
According to a second aspect of the embodiments of the present invention, there is provided a method for manufacturing a flexible display panel, including:
forming a positive piezoelectric film layer, a first insulating material layer and a second insulating material layer, wherein the positive piezoelectric film layer is a film layer comprising a material with a positive piezoelectric effect;
the positive piezoelectric thin film layer is formed between the first insulating material layer and the second insulating material layer, and when the flexible display panel is bent, the positive piezoelectric thin film layer converts stress generated on the first insulating material layer and the second insulating material layer into electric energy.
Optionally, the forming of the positive voltage film layer, the first insulating material layer and the second insulating material layer includes:
providing a first insulating material layer;
forming the positive piezoelectric film layer on the first insulating material layer;
forming a second insulating material layer on the positive voltage film layer;
the first insulating material layer is a first flexible substrate, and the second insulating material layer is a second flexible substrate.
Optionally, before forming the positive voltage film layer, the first insulating material layer, and the second insulating material layer, the method further includes:
providing a third flexible substrate;
forming an organic display function layer on the third flexible substrate;
form positive voltage film layer, first insulating material layer and second insulating material layer, include:
sequentially forming a first insulating material layer, a positive voltage electric film layer and a second insulating material layer on the organic display function layer;
the first insulating material layer is a thin film packaging layer, and the second insulating material layer is an optical adhesive layer.
Optionally, the organic display function layer includes a thin film transistor array layer, an anode layer, an organic light emitting layer, and a cathode layer.
According to a third aspect of embodiments of the present invention, there is provided a flexible display device including: the flexible display panel of any of the above.
According to the technical scheme, the flexible display panel can reduce the internal stress of the flexible display panel during bending by forming the positive voltage thin film layer, the bending resistance and the display performance of the flexible display panel are improved, the first insulating material layer and the second insulating material layer are used for isolating the electric energy generated by the positive voltage thin film layer, and the display effect of the flexible display panel cannot be influenced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
Fig. 1 is a schematic cross-sectional structure diagram of a flexible display panel according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional structure diagram of a flexible display panel according to another embodiment of the present invention;
fig. 3 is a flowchart illustrating a method of manufacturing a flexible display panel according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for manufacturing a flexible display panel according to another embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
The flexible display panel has the characteristic of being bendable, and for the flexible display panel, the reduction of internal stress during bending is beneficial to improving the bending capability and the display performance of the flexible display panel.
Accordingly, an embodiment of the present invention provides a flexible display panel, including:
the positive voltage electric film layer, the first insulating material layer and the second insulating material layer;
the positive piezoelectric film layer is formed between the first insulating material layer and the second insulating material layer, and when the flexible display panel is bent, the positive piezoelectric film layer converts stress generated by deformation of the positive piezoelectric film layer into electric energy.
The positive piezoelectric film layer is a film layer made of a material with positive piezoelectric effect, the positive piezoelectric effect means that when some dielectric materials are deformed under the action of external force along a certain direction, polarization phenomenon can be generated inside the dielectric materials, charges with opposite positive and negative polarities appear on two opposite surfaces of the dielectric materials, and when the external force is removed, the dielectric materials can be restored to an uncharged state.
The flexible display panel generally includes various layer structures such as a thin film transistor array layer, an insulating layer, a planarization layer, and the like, and for a flexible display panel employing the OLED light emitting device, the flexible display panel mainly includes a thin film transistor array layer, an anode layer, an organic light emitting layer, a cathode layer, a thin film encapsulation layer, and the like, formed on a flexible substrate.
Foretell first insulating material layer and second insulating material layer indicate the layer that has insulating properties among the flexible display panel, positive piezoelectric film layer presss from both sides between first insulating material layer and second insulating material layer, positive piezoelectric film layer has positive piezoelectric effect, when flexible display panel is crooked, can convert its stress that produces because of deformation into the electric energy, because this positive piezoelectric film can convert stress into the electric energy, consequently, the stress that its deformation produced can be released, and positive piezoelectric film layer forms again between first insulating material layer and second insulating material layer, also indirect reduction the stress effect of positive piezoelectric film layer to first insulating material layer and second insulating material layer, help reducing flexible display panel's internal stress.
And the first insulating material layer and the second insulating material layer can isolate electric energy generated by the positive voltage electric film layer, can prevent the influence on display devices formed on the flexible display panel, and does not influence the display effect of the flexible display panel.
According to the flexible display panel, the positive voltage thin film layer is formed, so that the internal stress of the flexible display panel during bending can be reduced, the bending resistance and the display performance of the flexible display panel can be improved, the first insulating material layer and the second insulating material layer are used for isolating electric energy generated by the positive voltage thin film layer, and the display effect of the flexible display panel cannot be influenced.
Fig. 1 is a schematic cross-sectional structural diagram of a flexible display panel according to an exemplary embodiment of the present invention, and referring to fig. 1, the flexible display panel includes:
the display unit comprises a first flexible substrate 11 and a second flexible substrate 12, wherein a positive piezoelectric film layer 20 is formed between the first flexible substrate 11 and the second flexible substrate 12, and the second flexible substrate 12 can further form a display unit 30.
In this embodiment, the first flexible substrate is used as a first insulating material layer, the second flexible substrate is used as a second insulating material layer, and the positive piezoelectric thin film layer is formed between the first flexible substrate and the second flexible substrate.
The first flexible substrate and the second flexible substrate are made of flexible materials, the flexible materials are Polyimide PI (Polyimide, abbreviated as PI) polymers, Polycarbonate PC (Polycarbonate, abbreviated as PC) resins, also called PC plastics, Polyethylene terephthalate (PET) plastics, and the like, and the first flexible substrate and the second flexible substrate can be made of the same material or different materials.
The first flexible substrate and the second flexible substrate are substrates for bearing a display unit structure, and the two substrates are arranged to enable the positive voltage thin film layer to be arranged between the first flexible substrate and the second flexible substrate so as to isolate electric energy generated by the positive voltage thin film layer.
The structure of the display unit may include various film layers, the specific structure included in the display unit is related to the type of the display panel, and for an OLED display panel that uses an OLED device to emit light, the structure of the display unit includes, for example, an organic display functional layer; for the liquid crystal display panel, the structure of the display unit includes, for example, a thin film transistor array layer, a pixel electrode layer, a common electrode layer, and the like, and the structure of the display unit is not limited herein.
When the flexible display panel is bent, tensile stress can appear on the outer surface of one side facing the protrusion, compressive stress can appear on the inner surface of one side facing the recess, and because the first flexible substrate and the second flexible substrate are positioned on the outermost sides, when the flexible display panel is bent, the larger tensile stress or compressive stress can exist on the two flexible substrates, the positive piezoelectric film layer is formed between the two flexible substrates, the stress generated on the two flexible substrates due to deformation can be reduced, and the bending resistance of the flexible display panel is further improved.
Fig. 2 is a schematic cross-sectional structure diagram of a flexible display panel according to another exemplary embodiment of the present invention, and referring to fig. 2, the flexible display panel includes:
a third flexible substrate 13;
an organic display function layer 40, a thin film packaging layer 50, a positive piezoelectric thin film layer 20 and an optical adhesive layer 51 are sequentially formed on the third flexible substrate 13;
in this embodiment, the film encapsulation layer 50 is used as a first insulating material layer, the optical adhesive layer 51 is used as a second insulating material layer, and the positive piezoelectric film layer 20 is formed between the film encapsulation layer 50 and the optical adhesive layer 51.
The third flexible substrate is a substrate made of a flexible material and is used for bearing various layers arranged on the third flexible substrate, such as an organic display function layer, a thin film packaging layer, a positive piezoelectric thin film layer, an optical glue layer and the like.
The organic display function layer 40 includes, for example, a thin film transistor array layer 41, an anode layer 42, an organic light emitting layer 43, a cathode layer 44, and the like, the organic light emitting layer may include a light emitting layer and a combination of one or more of a hole injection layer, a hole transport layer, an electron blocking layer, a hole blocking layer, an electron transport layer, and an electron injection layer, and the thin film transistor array layer is a layer required for a circuit for controlling light emission of each OLED device, and includes, for example, a gate layer, a gate insulating layer, an active layer, a source drain layer, a planarization layer, a pixel defining layer, and the like.
The organic display function layer is formed on the third flexible substrate, so that a flexible OLED display panel can be formed, the flexible OLED display panel can be bent, has the characteristics of lightness and thinness, low power consumption and wide viewing angle, and can be widely applied to various products with display functions, such as tablet computers, televisions, mobile terminals and wearable devices.
For the flexible OLED display panel, the organic light emitting layer is sensitive to water and oxygen, so that the thin film encapsulation layer covers the organic light emitting layer and can play a role in blocking water and oxygen so as to protect the OLED device.
The thin film encapsulation layer can adopt a laminated structure formed by alternately arranging organic layers and inorganic layers, and the number of the organic layers and the inorganic layers can be an odd-numbered layer structure such as a 3-layer structure, a 5-layer structure, a 7-layer structure and the like.
The material of the inorganic layer can be selected from one or more of alumina, zinc oxide, titanium oxide, silicon dioxide, silicon nitride and zirconium oxide; the material of the organic layer may be selected from one or a combination of several of polyvinyl alcohol, urethane acrylate polymer, and polyimide resin, for example.
Inorganic layer has better oxygen performance of hindering water, but its toughness is handed over relatively poorly, and elasticity is lower, is unfavorable for the deformation stress when dispersion bending, and organic layer has better toughness, can play the release stress and wrap up the effect of holding the dust under the arms, consequently adopts the mode that organic layer and inorganic layer set up in turn, can guarantee better oxygen effect of hindering water, makes flexible OLED display panel have better toughness again, can realize better encapsulated effect.
The film packaging layer and the optical adhesive layer are closer to the outer side of the flexible display panel, the positive piezoelectric film layer is formed between the film packaging layer and the optical adhesive layer, large stress generated by deformation on the film packaging layer and the optical adhesive layer when the flexible display panel is bent can be reduced, and the bending resistance of the flexible display panel is improved.
The material of the positive piezoelectric film layer includes a material having a positive piezoelectric effect, and the material having the positive piezoelectric effect is any one of or a combination of two or more of Polyvinylidene fluoride (PVDF), a polymer material containing an epoxy resin matrix, a polymer material containing a Polyvinyl chloride (PVC) matrix, a polymer material containing a Polyurethane (PU) matrix, or a material containing an organic silicon polymer matrix.
The polymer material containing the epoxy resin matrix refers to a polymer compound containing basic functional groups of epoxy resin, the polymer material containing the polyvinyl chloride matrix refers to a polymer compound containing basic functional groups of polyvinyl chloride, the polymer material containing the polyurethane matrix refers to a polymer compound containing basic functional groups of polyurethane, and the material containing the organic silicon polymer matrix refers to a polymer containing silicon elements in the molecular structure and organic functional groups connected to silicon atoms.
The positive piezoelectric thin film layer may be a film layer formed by a material having a positive piezoelectric effect, or the material of the positive piezoelectric thin film layer may include other organic materials (for example, polyimide) in addition to the material having the positive piezoelectric effect, and a composite material formed by the material having the positive piezoelectric effect and the other organic materials is used as a material for preparing the positive piezoelectric thin film layer.
The preferred, the positive voltage electric film layer adopts the thin layer that polyvinylidene fluoride PVDF formed, and this material has the characteristic of fluororesin and general resin concurrently, except having positive voltage electric effect, still has good high temperature resistance characteristic, but filmization forms the thin layer that thickness is the micron order, consequently, can make the positive voltage electric film layer that has transparent effect, not only helps improving flexible display panel's luminance, still can be used to make transparent flexible display panel.
It should be noted that, referring to fig. 2, the flexible display panel may further include a flexible cover 60, the flexible cover 60 is disposed on the optical adhesive layer 51, the flexible cover 60 may be bonded by the optical adhesive layer 51 to fix the flexible cover 60, and the flexible cover 60 covers the organic display functional layer 40, the thin film encapsulation layer 50, the positive piezoelectric thin film layer 20 and the optical adhesive layer 51, and may protect the organic display functional layer.
The flexible cover sheet may be made of the same or different flexible material as the first flexible substrate.
The optical cement OCA layer (OCA for short) is a special Adhesive, has colorless and transparent characteristics, has the light transmittance of over 90 percent, has good Adhesive strength and is beneficial to better fixing the flexible cover plate.
In addition, in the embodiment, the positive piezoelectric thin film layer is formed on the thin film encapsulation layer, so that the function of blocking water and oxygen can be further achieved, the OLED device is protected, and the service life and the light emitting quality of the OLED device are improved.
The embodiment of the invention also provides a preparation method of the flexible display panel, which comprises the following steps:
forming a positive voltage electric film layer, a first insulating material layer and a second insulating material layer;
the positive piezoelectric thin film layer is formed between the first insulating material layer and the second insulating material layer, and when the flexible display panel is bent, the positive piezoelectric thin film layer converts stress generated on the first insulating material layer and the second insulating material layer into electric energy.
The manufacturing method is a method for manufacturing the flexible display panel, and the positive piezoelectric film layer, the first insulating material layer and the second insulating material layer can be formed by adopting the existing process, and details are not repeated here.
In some examples, as shown in fig. 3, the forming of the positive piezoelectric thin film layer, the first insulating material layer, and the second insulating material layer includes:
s10, providing a first flexible substrate;
s11, forming a positive piezoelectric film layer on the first flexible substrate;
and S12, forming a second flexible substrate on the positive voltage electric thin film layer.
The above-mentioned manufacturing method is a method for manufacturing the flexible display panel shown in fig. 1, in which the first flexible substrate is used as the first insulating material layer, and the second flexible substrate is used as the second insulating material layer.
In an alternative embodiment, as shown in fig. 4, a method for manufacturing a flexible display panel may include:
step S20, providing a third flexible substrate;
and S21, sequentially forming an organic display function layer, a film packaging layer, a positive piezoelectric film layer and an optical adhesive layer on the third flexible substrate.
The above-mentioned manufacturing method is a method for manufacturing the flexible display panel shown in fig. 2, in which the film encapsulation layer is used as the first insulating material layer, and the optical adhesive layer is used as the second insulating material layer.
Optionally, the organic display function layer includes a thin film transistor array layer, an anode layer, an organic light emitting layer, and a cathode layer.
The above processes for forming the organic display functional layer, the thin film encapsulation layer, the positive piezoelectric thin film layer and the optical adhesive layer on the flexible substrate can be implemented by using existing processes, for example, for forming the thin film transistor array layer, the thin film encapsulation layer, the positive piezoelectric thin film layer and the optical adhesive layer, a patterning process or other printing processes can be used, and the patterning process includes, for example: coating, exposing, developing, etching and/or stripping the photoresist; the processes for forming the anode layer, the organic light emitting layer and the cathode layer can adopt a vacuum evaporation process and the like, and the specific processes are not described herein.
An embodiment of the present invention further provides a flexible display device, including: the flexible display panel according to any of the above embodiments.
The OLED display device described above includes the display panel described in the above embodiment. The display device can be used as any product or component with a display function, such as electronic paper, a mobile phone, a tablet personal computer, a television, a display, a notebook computer, a digital photo frame, a navigator, wearable equipment and the like.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
Claims (6)
1. A flexible display panel, comprising:
the piezoelectric film comprises a positive piezoelectric film layer, a first insulating material layer and a second insulating material layer, wherein the positive piezoelectric film layer is a film layer comprising a material with a positive piezoelectric effect;
the positive piezoelectric film layer is formed between the first insulating material layer and the second insulating material layer, and when the flexible display panel is bent, the positive piezoelectric film layer converts stress generated by deformation of the positive piezoelectric film layer into electric energy so as to improve the bending resistance of the flexible display panel;
the display unit is positioned on the second insulating material layer;
the first insulating material layer is a first flexible substrate, the second insulating material layer is a second flexible substrate, and the first flexible substrate and the second flexible substrate are substrates for bearing the display unit structure.
2. Panel according to claim 1,
the positive voltage electric film layer is a transparent positive voltage electric film layer.
3. Panel according to claim 1 or 2,
the material of the positive piezoelectric film layer comprises a material with a positive voltage effect, and the material with the positive piezoelectric effect is any one or a combination of more than two of polyvinylidene fluoride, a high polymer material containing an epoxy resin matrix, a high polymer material containing a polyvinyl chloride matrix, a high polymer material containing a polyurethane matrix or a material containing an organic silicon polymer matrix.
4. A method for manufacturing a flexible display panel, comprising:
providing a first insulating material layer;
forming a positive voltage electric film layer on the first insulating material layer;
forming a second insulating material layer on the positive voltage film layer;
forming a display unit on the second insulating material layer;
the first insulating material layer is a first flexible substrate, the second insulating material layer is a second flexible substrate, and when the flexible display panel is bent, the stress generated on the first insulating material layer and the second insulating material layer is converted into electric energy by the positive piezoelectric film layer, so that the bending resistance of the flexible display panel is improved.
5. The production method according to claim 4,
the display unit includes an organic display functional layer.
6. A flexible display device, comprising: the flexible display panel of any one of claims 1-3.
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| CN111694455A (en) * | 2019-03-15 | 2020-09-22 | 陕西坤同半导体科技有限公司 | Display panel and display device thereof |
| CN111276521A (en) * | 2020-02-11 | 2020-06-12 | 深圳市华星光电半导体显示技术有限公司 | Flexible display module and display device |
| CN114267253A (en) * | 2021-12-29 | 2022-04-01 | Oppo广东移动通信有限公司 | Display module and electronic device |
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| KR102404723B1 (en) * | 2015-10-30 | 2022-06-02 | 삼성디스플레이 주식회사 | Display device |
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