CN109411525B - Flexible display panel and preparation method thereof - Google Patents
Flexible display panel and preparation method thereof Download PDFInfo
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- CN109411525B CN109411525B CN201811528103.XA CN201811528103A CN109411525B CN 109411525 B CN109411525 B CN 109411525B CN 201811528103 A CN201811528103 A CN 201811528103A CN 109411525 B CN109411525 B CN 109411525B
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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
- H10K59/40—OLEDs integrated with touch screens
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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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- H—ELECTRICITY
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- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/868—Arrangements for polarized light emission
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- H—ELECTRICITY
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Abstract
The invention provides a flexible display panel and a preparation method thereof, wherein the flexible display panel comprises a flexible substrate, a light-emitting device layer arranged on the flexible substrate, a touch layer positioned on the upper side of the light-emitting device layer and a polarizing layer positioned on the touch layer, the touch layer and the polarizing layer are respectively provided with one side close to each other and one side far away from each other, an additional layer is attached to one side far away from each other of the touch layer and/or the polarizing layer, and the Poisson ratio of the additional layer is negative. According to the invention, the additional layer with the negative Poisson's ratio is attached to the side, away from each other, of the polarizing layer and/or the touch layer of the flexible display panel, so that the stress distribution between the film layers is changed, the adhesion between the polarizing layer and the touch layer is increased, the film layer separation phenomenon is avoided, the bending characteristic of the flexible display panel is improved, and the service life of the flexible display panel is prolonged.
Description
Technical Field
The invention relates to the technical field of display panel manufacturing, in particular to a flexible display panel and a preparation method thereof.
Background
An organic electroluminescent (O L ED) device has characteristics of low power consumption, portability, high brightness, wide field of view, fast response, and the like, and one of the most notable characteristics of the O L ED device is that it can realize a flexible display function, so that it can be widely applied to various fields such as portable electronic devices, wearable electronic devices, and vehicle-mounted electronic devices.
Flexible O L ED devices generally use a flexible polymer substrate as a carrier, and are formed by depositing a transparent anode, a metal cathode, and two or more organic light-emitting layers sandwiched therebetween, where the organic light-emitting layers generally include a hole injection layer, a hole transport layer, a light-emitting layer, an electron transport layer, and an electron injection layer.
As the flexible display technology is developed, the flexible display panel is applied more and more, and as shown in fig. 1, the flexible display panel 100 'includes a flexible substrate 10', a light emitting device layer 20', a touch layer 30', a PO L (Polarizer) layer 40', and an encapsulating cover 50' that are sequentially stacked, in practical applications, the flexible display panel is usually bent, when the flexible display panel is curled or unfolded, the touch layer 30 'of the flexible display panel is different from the PO L layer 40', the bending capability is greatly different, and continuous application of stress causes the touch layer 30 'of the O L ED device and the PO L layer 40' to separate from each other, which causes physical and structural damage of the O L ED display panel and causes separation of the O L ED display device, thereby making it difficult to ensure the performance of the flexible O L ED display device.
Aiming at the problem that the touch layer and the PO L layer which are mutually attached in the flexible display panel are easy to separate from each other, one solution in the prior art is to coat thicker optical cement between the touch layer and the PO L layer so as to increase the bonding force between the two film layers and further reduce the possibility of separating the two film layers, however, the whole flexible display panel is thickened by the method, further the maximum strain borne in the bending process is increased, the bending stress borne by each film layer is relatively increased, and further the effect of preventing the touch layer from being separated from the PO L layer is poor.
Therefore, there is a need to provide an improved flexible display panel and a method for manufacturing the same to overcome the above problems.
Disclosure of Invention
The invention aims to provide a flexible display panel which is convenient to manufacture and can effectively avoid the separation of a touch layer and a PO L layer and a preparation method thereof.
In order to achieve the above object, the present invention provides a flexible display panel, which includes a flexible substrate, a light emitting device layer disposed on the flexible substrate, a touch layer located on an upper side of the light emitting device layer, and a polarizing layer located on the touch layer, where the touch layer and the polarizing layer have a side close to each other and a side away from each other, and an additional layer is attached to a side of the touch layer and/or the polarizing layer away from each other, and a poisson ratio of the additional layer is negative.
As a further improvement of the present invention, the additional layer is processed and formed and then attached to the touch layer or the polarizing layer.
As a further development of the invention, the thickness of the additional layer is from 10 μm to 100. mu.m.
As a further development of the invention, the thickness of the additional layer is from 10 μm to 20 μm.
As a further improvement of the present invention, when the side of the polarizing layer and the side of the touch layer away from each other are respectively provided with one additional layer, the thickness of each additional layer is 10 μm to 50 μm.
As a further improvement of the present invention, the additional layer is adhered to the touch layer or the polarizing layer by an adhesive layer.
As a further improvement of the invention, the additional layer is a honeycomb structure or a slit-type periodic structure.
As a further improvement of the invention, the substrate of the additional layer is PVC, PMMA, FEP, EVA, EMA or PVB.
In order to achieve the above object, the present invention further provides a method for manufacturing a flexible display panel, which includes the following steps:
step a: providing a flexible substrate;
step b: preparing a light emitting device onto the flexible substrate to form a light emitting device layer;
step c: preparing to form an additional layer and making the Poisson's ratio of the additional layer negative;
step d: forming a touch layer on the light emitting device layer;
step e: forming a polarizing layer on the upper side of the touch layer;
wherein step d1 is present after step c, before step d and/or step e1 is present after step e;
step d1 is attaching the additional layer on the upper side of the light emitting device layer, so that the touch layer in step d is formed on the additional layer;
step e1 is to attach the additional layer on the upper side of the polarizing layer.
As a further improvement of the present invention, the additional layer is formed by laser processing and then attached to a side of the touch layer and/or the polarizing layer facing away from each other by an attaching device.
The invention has the beneficial effects that: according to the invention, the additional layer with the negative Poisson ratio is attached to the side, away from each other, of the polarizing layer and/or the touch layer of the flexible display panel, and the Poisson ratio of the additional layer is negative, so that the additional layer is in a hyperbolic arch shape when being bent, a hollow low-pressure air belt is formed inside the additional layer, and then acting force is applied to the adjacent polarizing layer or touch layer, so that the polarizing layer and the touch layer are close to each other, the stress distribution between the film layers is changed, the adhesion between the polarizing layer and the touch layer is increased, the phenomenon of film layer separation is avoided, the bending property of the flexible display panel is improved, and the service life of the flexible display panel is.
Drawings
Fig. 1 is a schematic cross-sectional view of a prior art flexible display panel.
Fig. 2 is a schematic cross-sectional view of a flexible display panel according to a first preferred embodiment of the invention.
FIG. 3 is a schematic cross-sectional view of a flexible display panel according to a second preferred embodiment of the invention.
Fig. 4 is a schematic cross-sectional view of a flexible display panel according to a third preferred embodiment of the invention.
Fig. 5 is a schematic view of a first structure of an additional layer of the flexible display panel according to the present invention.
Fig. 6 is a schematic diagram of a second structure of an additional layer of the flexible display panel according to the present invention.
Fig. 7 is a schematic view of a third structure of an additional layer of the flexible display panel according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present invention.
Referring to fig. 2 to 4, the flexible display panel 100 of the present invention includes a flexible substrate 10, a light emitting device layer 20 disposed on the flexible substrate 10, a touch layer 30 disposed on an upper side of the light emitting device layer 20, a polarizing layer 40 disposed on the touch layer 30, and a cover plate 50, wherein an additional layer 60 is attached on a lower side of the touch layer 30 and/or an upper side of the polarizing layer 40, and a poisson ratio of the additional layer 60 is negative.
In the present invention, the flexible substrate 10 may be an organic polymer substrate such as a polyimide substrate (PI substrate), a polyamide substrate, a polycarbonate substrate, and a polyether sulfone substrate, so as to implement a display function of a flexible product.
The light emitting device layer 20 includes, but is not limited to, an electroluminescent element, a liquid crystal display device, an organic sensor, and other electronic devices. The light emitting device layer 20 is formed on the flexible substrate 10 and can be fabricated by a process known to those skilled in the art, which will not be described in detail herein.
The substrate of the touch layer 30 may be a base material such as transparent Polyimide (PI), polyethylene terephthalate (PET), etc.; the flexible substrate of the polarizing layer 40 may be a base material such as Triacetylcellulose (TAC), transparent polyimide, or the like.
In the present invention, the additional layer 60 is formed by laser processing, and then is attached to the touch layer 30 or the polarizing layer 40 by a bonding device. In this way, the additional layer 60 is attached after being separately formed, so as to facilitate the manufacturing and ensure the thickness and precision of the additional layer 60.
Further, the thickness of the additional layer 60 is 10 μm to 100 μm, and the excessive thickness of the additional layer 60 is difficult to be realized in the process, the stability of the film layer is poor, and the excessive thickness of the additional layer has an excessive influence on the overall thickness of the module. In a preferred embodiment of the invention, the additional layer has a thickness of 10 μm to 20 μm.
As shown in fig. 2, in the first preferred embodiment of the flexible display panel 100 of the present invention, the lower side of the polarization layer 40 and the upper side of the touch layer 30 are respectively provided with one additional layer 60, and in this case, the thickness of each additional layer 60 is 10 μm to 50 μm.
Further, the substrate of the additional layer 60 may be PVC (Polyvinyl chloride), PMMA (Polymethyl methacrylate), FEP (Fluorinated Ethylene propylene Copolymer), EVA (Ethylene Vinyl Acetate Copolymer), EMA (Ethylene methyl acrylate Copolymer), or PVB (Polyvinyl Butyral), and the additional layer 60 is formed by laser processing the substrate by a laser cutter.
By selecting the substrate of the additional layer 60, the hardness of the film layer is high, the light transmittance is good, and the anti-pollution performance such as dust adsorption is high and the chemical stability is good. In this embodiment, when the additional layer 60 is made of PMMA plastic, the PMMA material needs to be hardened, that is, a layer of hardening liquid is plated on the surface of the PMMA material to increase the surface hardness thereof to 5-6H.
The additional layer 60 is bonded to the touch layer 30 and the polarizing layer 40 by an adhesive layer, and in the present invention, the thickness of the adhesive layer is smaller than 100 μm, so as to avoid increasing the overall module thickness of the flexible display panel 100.
When the flexible display panel 100 is bent, no matter the touch layer 30 and the polarizing layer 40 are made of the same or different materials, a low air pressure zone (double curvature characteristic) is formed inside the additional layer 60, so as to improve the back supporting force of the additional layer 60, and apply an acting force to the adjacent polarizing layer 40 or touch layer 30, so that the polarizing layer 40 and the touch layer 30 are close to each other. Specifically, the additional layer 60 located above the polarizing layer 40 applies downward stress to the polarizing layer 40, and the additional layer 60 located below the touch layer 30 applies upward stress to the touch layer 30, so that the adhesion between the polarizing layer 40 and the touch layer 30 is increased to prevent the polarizing layer 40 and the touch layer 30 from being separated from each other when they are bent.
In this embodiment, the additional layer 60 is disposed on both sides of the polarizing layer 40 and the touch layer 30 (i.e. the upper side of the polarizing layer 40 and the lower side of the touch layer 30), so that the flexible display panel 100 has better reliability, can better change stress distribution, and can prevent the polarizing layer 40 and the touch layer 30 from being separated.
In the present invention, the additional layer 60 is a honeycomb structure or a slit-type periodic structure, as shown in fig. 5 to 7, three structures of the additional layer 60 are shown, wherein the additional layer 60 shown in fig. 5 is a bow-tie honeycomb structure, the additional layer 60 shown in fig. 6 is a chiral honeycomb structure, and the additional layer 60 shown in fig. 7 is a slit-type periodic structure.
The Poisson ratio of the common plastic film is positive, and the common plastic film is saddle-shaped when being bent; the additional layer 60 of the present invention has a honeycomb structure or a slit-type periodic structure, and is in a hyperbolic arch shape when being bent, so that the back supporting force of the additional layer 60 can be improved, and thus the stress distribution between the polarizing layer 40 and the film layer of the touch layer 30 can be changed, and the adhesion between the polarizing layer 40 and the touch layer 30 can be increased.
When the additional layer 60 is a bow-tie type honeycomb structure, the Poisson ratio is-1 to-0.1; when the additional layer 60 is a chiral honeycomb structure, the Poisson's ratio is-1; when the additional layer 60 is a slit-type periodic structure, its Poisson's ratio is-1.
Fig. 3 shows a second preferred embodiment of the flexible display panel 100 of the present invention, which is substantially identical to the first preferred embodiment in structure, except that: in this embodiment, the additional layer 60 is only attached to the lower side of the touch layer 30, and when the flexible display panel 100 is bent, the additional layer 60 applies upward stress to the touch layer 30, so that the touch layer 30 is close to the polarizing layer 40 to prevent the touch layer 30 and the polarizing layer from being separated from each other.
Compared to the first preferred embodiment, the flexible display panel 100 of the second preferred embodiment has only one additional layer 60 disposed under the touch layer 30, which has high transmittance and relatively low cost.
Fig. 4 shows a third preferred embodiment of the flexible display panel 100 of the present invention, which is different from the first preferred embodiment in that: in this embodiment, the additional layer 60 is only attached to the upper side of the polarization layer 40, and when the flexible display panel 100 is bent, the additional layer 60 applies a downward stress to the polarization layer 40, so that the polarization layer 40 is close to the touch layer 30 to avoid separation.
Fig. 2 to 4 show schematic structural diagrams of the flexible display panel 100 according to embodiments of the present invention, and as can be seen from fig. 2 to 4, the method for manufacturing the flexible display panel 100 of the present invention includes the following steps:
step a: providing a flexible substrate 10;
step b: fabricating a light emitting device on the flexible substrate 10 to form a light emitting device layer 20;
step c: preparing to form the additional layer 60 and making the poisson's ratio of the additional layer 60 negative;
step d: forming a touch layer 30 on the light emitting device layer 20;
step e: forming a polarizing layer 40 on an upper side of the touch layer 30;
wherein step d1 is present after step c, before step d and/or step e1 is present after step e;
step d1 is to attach the additional layer 60 to the upper side of the light emitting device layer 20, so that the touch layer 30 in step d is formed on the additional layer 60, wherein a layer of adhesive glue is first coated on the light emitting device layer 20, and then the additional layer 60 is attached to the adhesive glue by using an attaching device;
step e1 is to attach the additional layer 60 on the upper side of the polarizing layer 40.
In addition, the method for manufacturing the flexible display panel 100 of the present invention further includes the steps of f: a cover plate 50 is formed on the polarizing layer 40.
Specifically, referring to fig. 2, in a first preferred embodiment of the present invention, a method for manufacturing the flexible display panel 100 includes the following steps:
step a: providing a flexible substrate 10;
step b: fabricating a light emitting device on the flexible substrate 10 to form a light emitting device layer 20;
step c: preparing to form the additional layer 60 and making the poisson's ratio of the additional layer 60 negative;
step d 1: the additional layer 60 is attached to the upper side of the light-emitting device layer 20, specifically, a bonding glue layer is coated on the upper surface of the light-emitting device layer 20, and then the additional layer 60 is attached to the bonding glue layer;
step d: forming a touch layer 30 on the additional layer 60;
step e: forming a polarizing layer 40 on an upper side of the touch layer 30;
step e 1: attaching the additional layer 60 on the upper side of the polarizing layer 40;
step f: a cover plate 50 is prepared on said additional layer 60 on the upper side of the polarizing layer 40.
In this embodiment, the step c may be performed before the step d1, that is, before, after, or simultaneously with the steps a and b, and the preparation order is not limited to the above description.
Referring to fig. 3, in a second preferred embodiment of the present invention, a method for manufacturing the flexible display panel 100 includes the following steps:
step a: providing a flexible substrate 10;
step b: fabricating a light emitting device on the flexible substrate 10 to form a light emitting device layer 20;
step c: preparing to form the additional layer 60 and making the poisson's ratio of the additional layer 60 negative;
step d 1: attaching the additional layer 60 on the upper side of the light emitting device layer 20;
step d: forming a touch layer 30 on the additional layer 60;
step e: forming a polarizing layer 40 on an upper side of the touch layer 30;
step f: a cover plate 50 is formed on the polarizing layer 40.
In this embodiment, step c is performed before step d1, and the preparation order is not limited to the above description.
Referring to fig. 4, in a third preferred embodiment of the present invention, a method for manufacturing the flexible display panel 100 includes the following steps:
step a: providing a flexible substrate 10;
step b: fabricating a light emitting device on the flexible substrate 10 to form a light emitting device layer 20;
step c: preparing to form the additional layer 60 and making the poisson's ratio of the additional layer 60 negative;
step d: forming a touch layer 30 on the light emitting device layer 20;
step e: forming a polarizing layer 40 on an upper side of the touch layer 30;
step e 1: attaching the additional layer 60 on the upper side of the polarizing layer 40;
step f: a cover plate 50 is prepared on said additional layer 60 on the upper side of the polarizing layer 40.
In the present example, the step c is performed before the step e1, and the preparation procedure is not limited to the above description.
In summary, according to the flexible display panel 100 and the manufacturing method thereof of the present invention, the additional layer 60 with a negative poisson ratio is attached to the side of the polarizing layer 40 and/or the touch layer 30 away from each other, and since the additional layer 60 has a negative poisson ratio and a double curvature characteristic, the additional layer is in a hyperbolic arch shape when bent, and a hollow low-pressure belt is formed inside the additional layer, so as to apply an acting force to the adjacent polarizing layer or touch layer, so that the polarizing layer and the touch layer approach each other, thereby changing the stress distribution between the film layers, increasing the adhesion between the polarizing layer 40 and the touch layer 30, further effectively improving the phenomenon that the film layers are easily separated or split during the bending process of the flexible display panel 100, and improving the bendable characteristic and the service life of the flexible display panel 100.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a flexible display panel, includes the flexible substrate, sets up light emitting device layer on the flexible substrate, be located the touch-control layer of light emitting device layer upside and be located polarizing layer on the touch-control layer which characterized in that: the touch control layer and the polarizing layer are provided with one sides close to each other and one sides far away from each other, an additional layer is attached to one side far away from each other of the touch control layer and/or the polarizing layer, and the Poisson ratio of the additional layer is negative.
2. The flexible display panel of claim 1, wherein: and the additional layer is processed and formed and then attached to the touch layer or the polarizing layer.
3. The flexible display panel of claim 2, wherein: the thickness of the additional layer is 10-100 μm.
4. The flexible display panel of claim 3, wherein: the thickness of the additional layer is 10-20 μm.
5. The flexible display panel of claim 3, wherein: when the additional layers are respectively arranged on the sides of the polarizing layer and the touch layer, which are far away from each other, the thickness of each additional layer is 10-50 μm.
6. The flexible display panel of claim 2 or 3, wherein: and the additional layer is adhered to the touch layer or the polarizing layer through an adhesive layer.
7. The flexible display panel of claim 2, wherein: the additional layer is a honeycomb structure or a slit-type periodic structure.
8. The flexible display panel of claim 2, wherein: the base material of the additional layer is PVC, PMMA, FEP, EVA, EMA or PVB.
9. A method of manufacturing a flexible display panel according to any one of claims 1 to 8, characterized in that: the method comprises the following steps:
step a: providing a flexible substrate;
step b: preparing a light emitting device onto the flexible substrate to form a light emitting device layer;
step c: preparing to form an additional layer and making the Poisson's ratio of the additional layer negative;
step d: forming a touch layer on the light emitting device layer;
step e: forming a polarizing layer on the upper side of the touch layer;
wherein step d1 is present after step c, before step d and/or step e1 is present after step e;
step d1 is attaching the additional layer on the upper side of the light emitting device layer, so that the touch layer in step d is formed on the additional layer;
step e1 is to attach the additional layer on the upper side of the polarizing layer.
10. The method of manufacturing a flexible display panel according to claim 9, wherein: and the additional layer is attached to one side of the touch layer and/or the polarizing layer, which deviates from each other, by attaching equipment after the additional layer is formed by laser processing.
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| CN109887416B (en) | 2019-03-15 | 2021-12-10 | 京东方科技集团股份有限公司 | Flexible display substrate, manufacturing method thereof and display device |
| CN112396952A (en) * | 2019-08-13 | 2021-02-23 | 陕西坤同半导体科技有限公司 | Flexible display panel, touch panel and flexible display device |
| CN111445796B (en) | 2020-04-02 | 2022-11-01 | 武汉华星光电半导体显示技术有限公司 | Display panel and flexible display device |
| CN111725269B (en) | 2020-06-02 | 2022-09-09 | 武汉华星光电半导体显示技术有限公司 | Display panel and preparation method thereof |
| CN111696442B (en) * | 2020-06-17 | 2022-04-01 | 合肥维信诺科技有限公司 | Flexible screen folding cover plate, preparation method thereof and flexible display module |
| CN114913775B (en) * | 2022-06-22 | 2023-11-28 | 武汉华星光电半导体显示技术有限公司 | Flexible display module and display device |
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| JP4730443B2 (en) * | 2009-02-04 | 2011-07-20 | ソニー株式会社 | Display device |
| CN103177656B (en) * | 2013-03-26 | 2015-07-01 | 哈尔滨工业大学 | Flexible back plate for flexible display |
| CN106710449A (en) * | 2016-12-09 | 2017-05-24 | 京东方科技集团股份有限公司 | Flexible display module and display device |
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Application publication date: 20190301 Assignee: Bazhou Yungu Electronic Technology Co., Ltd.|Kunshan Institute of technology new flat panel display technology center Co., Ltd.|Kunshan Guoxian photoelectric Co., Ltd Assignor: The valley (Guan) Technology Co. Ltd. Contract record no.: X2019990000155 Denomination of invention: Flexible display panel, manufacturing method thereof and display device License type: Common License Record date: 20191030 |
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