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CN108847452B - Stretchable display device and preparation method thereof - Google Patents

Stretchable display device and preparation method thereof Download PDF

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Publication number
CN108847452B
CN108847452B CN201810610027.0A CN201810610027A CN108847452B CN 108847452 B CN108847452 B CN 108847452B CN 201810610027 A CN201810610027 A CN 201810610027A CN 108847452 B CN108847452 B CN 108847452B
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Prior art keywords
display device
elastic substrate
protrusions
protrusion
stretchable display
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CN108847452A (en
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杨海涛
刘玉成
于锋
刘晓佳
李阳
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Yungu Guan Technology Co Ltd
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Yungu Guan Technology Co Ltd
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    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10OLED displays
    • H10K59/12Active-matrix OLED [AMOLED] displays
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00Organic light-emitting devices
    • H10K50/80Constructional details
    • H10K50/84Passivation; Containers; Encapsulations
    • H10K50/841Self-supporting sealing arrangements
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K71/00Manufacture or treatment specially adapted for the organic devices covered by this subclass
    • HELECTRICITY
    • H10SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10KORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K77/00Constructional details of devices covered by this subclass and not covered by groups H10K10/80, H10K30/80, H10K50/80 or H10K59/80
    • H10K77/10Substrates, e.g. flexible substrates
    • H10K77/111Flexible substrates
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/549Organic PV cells

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

The embodiment of the invention provides a stretchable display device, and solves the problem that the stretchable display device in the prior art is low in stretching degree. An embodiment of the present invention provides a stretchable display device, including: the elastic substrate is provided with a plurality of bulges, the elastic substrate and the bulges form a three-dimensional structure, and the functional film layer is superposed on the elastic substrate provided with the bulges, wherein the functional film layer is superposed on the three-dimensional structure formed by the elastic substrate and the bulges; when the display device is stretched, the protrusions on the elastic substrate are stretched, increasing the stretchability of the display device.

Description

Stretchable display device and preparation method thereof
Technical Field
The invention relates to the technical field of display, in particular to a stretchable display device and a preparation method thereof.
Background
With the development of display technology, various display devices have been developed and have been widely used in televisions, personal computers, laptop computers, tablet PCs, mobile phones, curved televisions, wearable devices, and the like. In order to meet more demands of users for new functions, efforts have been made to develop new forms of display devices, such as stretchable display devices, that are desired to form a display device that can have properties of extending or contracting as well as bending when it is pulled. However, when the display substrate is stretched, the stress generated by the extension, contraction or bending of the base may cause the metal wires of the base to be likely to crack or even break, that is, even if the display substrate is stretchable, the metal wires are not stretched along with the stretching of the display substrate. In addition, the pixel devices in the pixel circuits on the display substrate cannot be stretched as the substrate is stretched. Resulting in a very low stretchability of the stretchable display device.
Disclosure of Invention
In view of this, embodiments of the present invention provide a stretchable display device, which solves the problems in the prior art that the display device has low stretchability and the metal wire is easily broken during stretching.
The invention provides a stretchable display device, comprising:
an elastic substrate;
a plurality of protrusions provided on the elastic substrate; and
and the functional film layer is superposed on the elastic substrate and the plurality of convex surfaces.
Wherein the protrusions are linearly arranged along a preset stretching direction on the plane of the elastic substrate.
Wherein the bulges are arranged on the plane of the elastic substrate in a matrix form.
Wherein the functional film layer comprises:
the driving circuit layer is used for driving the pixels to emit light and comprises a plurality of driving units and conducting wires which are respectively and electrically connected with the driving units; and
and the pixel light-emitting layer is arranged on the driving circuit layer.
Wherein the driving unit is disposed in a gap between adjacent two of the protrusions.
Wherein at least one of the leads is disposed on an upper surface of at least one of the bumps.
Further, the crisscross position of at least one wire is arranged on the upper surface of at least one protrusion.
Wherein the material of the bulge is flexible organic material.
Further, the display device further includes:
and the barrier film is arranged between the elastic substrate and the functional film layer, is covered on the elastic substrate and the convex surface, and keeps the surface shape of the barrier film consistent with the convex shape of the convex surface.
As another aspect of the present invention, an embodiment of the present invention provides a method of manufacturing a stretchable display device, including:
providing a rigid base plate, and preparing an elastic substrate on the rigid base plate;
preparing a plurality of protrusions on the elastic substrate;
preparing a functional film layer on the elastic substrate provided with a plurality of bulges in an overlapping manner; and
peeling off the rigid substrate.
Wherein the functional layer comprises: the driving circuit layer is used for driving the pixels to emit light and comprises a plurality of driving units and conducting wires which are respectively and electrically connected with the driving units; and a pixel light emitting layer provided on the driving circuit layer;
wherein preparing a plurality of protrusions on the elastic substrate comprises:
preparing the protrusion around a preparation position of the driving unit; and/or the presence of a gas in the gas,
and preparing the bumps at the crisscross positions of the wires.
The stretchable display device provided by the invention is characterized in that the protrusion is arranged on the elastic substrate, the three-dimensional structure is formed on the elastic substrate, other functional film layer structures of the display device are formed on the elastic substrate with the protrusion, the shape of the lower surface of the functional film layer is consistent with that of the elastic substrate with the protrusion, and when the screen body is stretched, the protrusion on the elastic substrate stretches, so that the functional film layer covering the protrusion is driven to stretch, the stretching degree of the elastic substrate and the functional film layer is increased, and the stretching degree of the display device is further improved.
Drawings
Fig. 1 is a schematic structural diagram of a stretchable display device according to an embodiment of the present invention.
FIG. 2 is a diagram illustrating an arrangement distribution of protrusions in a stretchable display device according to an embodiment of the present invention.
FIG. 3 is a diagram illustrating an arrangement distribution of protrusions in a stretchable display device according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating an arrangement distribution of protrusions in a stretchable display device according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a stretchable display device according to an embodiment of the invention.
Fig. 6 is a schematic flow chart illustrating a method for manufacturing a stretchable display device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a schematic diagram illustrating a stretchable display device according to an embodiment of the present invention, including: an elastic substrate 2; a plurality of protrusions 3 provided on the elastic substrate 2; preparing a functional film layer 7 on the surfaces of an elastic substrate 2 and a plurality of protrusions 3, wherein the elastic substrate 2 and the plurality of protrusions 3 form a three-dimensional structure, the functional film layer 7 is used for realizing the normal operation of the display device, the functional film layer 7 comprises a plurality of film layers required for realizing the normal operation of the display device, the shape of the lower surface of the functional film layer 7 is consistent with the shape of the three-dimensional structure formed by the protrusions 3 and the elastic substrate 2, in order to ensure that the tensile property of the display device is better, in one embodiment of the invention, the surface shape of at least one film layer in the functional film layer 7 is consistent with the protrusion shape of the surface of the protrusion 3, and in other embodiments of the invention, the surface shape of each film layer in the functional film layer 7 is consistent with the protrusion shape of the surface of; by the design, when the display device stretches, the protrusions 3 stretch, and the part of the film layer, which is consistent with the shape of the three-dimensional structure formed by the protrusions 3 and the elastic substrate 2 and covers the protrusions 3, stretches, so that the stretching degree of the functional film layer is increased, and further the stretching degree of the display device is increased, and compared with the prior art, the stretching degree of the display device with the structure is increased by 3% -5%.
It should be understood that whether the surface shape of the single film layer in the functional film layer 7 needs to be consistent with the convex shape of the surface of the protrusion 3 can be selected according to the actual manufacturing requirements of the display device, and the invention is not limited thereto.
It should be understood that the material of the elastic substrate 2 can be selected according to actual requirements, for example, a silicone rubber (PDMS) with high elasticity can be selected, and when the display device is stretched, the elastic substrate 2 has excellent stretchability, so that the display device has excellent stretchability.
According to the stretchable display device provided by the embodiment of the invention, the plurality of protrusions 3 are arranged on the elastic substrate 2, so that the elastic substrate 2 forms a three-dimensional structure, and when the display device is stretched, the plurality of protrusions 3 arranged on the elastic substrate are unfolded, so that the stretching degree of the stretchable display device is increased.
In practical application, the display device often needs to be stretched in a certain direction, so in an embodiment of the present invention, the protrusions 3 on the elastic substrate 2 are linearly arranged on the elastic substrate 2 along a preset stretching direction, and when the display device is stretched in the stretching direction, the protrusions 3 are unfolded in the stretching direction, so that the stretchable degree of the display device in the direction is increased. In an embodiment of the present invention, the cross section of the protrusion 3 in the stretching direction of the display device is semicircular, and in another embodiment of the present invention, the cross section of the protrusion 3 in the stretching direction of the display device may be inverted V-shaped, may be formed by a plurality of continuous semicircular shapes, may be formed by a plurality of continuous inverted V-shaped shapes, or may be formed by a mixture of semicircular shapes and inverted V-shaped shapes, which is not limited in the present invention.
When the display device is stretched, the linear distribution of the protrusions 3 on the elastic substrate 2 is parallel to the Y-axis of the display device when the stretching direction is the Y-axis direction in the display device, as shown in fig. 2. When the stretching direction is the X-axis direction in the display device, the linear distribution of the protrusions 3 on the elastic substrate 2 is arranged parallel to the X-axis of the display device, as shown in fig. 3. It should be understood that the linear arrangement of the protrusions 3 on the elastic substrate 2 is designed according to the practical application that the display device can be stretched in the preset stretching direction, so that the linear arrangement of the protrusions 3 on the elastic substrate 2 is only parallel to the stretching direction, for example, in other embodiments, the linear arrangement of the protrusions 3 on the elastic substrate 2 may also be parallel to the diagonal line in the display device, which is not limited by the present invention.
However, in practical applications, when the display device is stretched in a full scale, the linear distribution of the protrusions 3 on the elastic substrate 2 does not satisfy the requirement, and in an embodiment of the present invention, the protrusions 3 are arranged on the elastic substrate 2 in a matrix form, as shown in fig. 4, such a design can satisfy the requirement of stretching the display device in a face-to-face manner.
In an embodiment of the present invention, the functional film 7 includes: the pixel light-emitting device comprises a driving circuit layer for driving pixels to emit light, and a hole injection layer, a hole transport layer, a pixel light-emitting layer, an electron transport layer, an electron injection layer and a metal cathode layer which are sequentially arranged on the driving circuit layer; the driving circuit layer includes a plurality of driving units 5 and wires 6 respectively connected to the plurality of driving units 5, and the driving units 5 are used for controlling whether the pixel light emitting layers emit light, in an embodiment of the present invention, the driving units 5 are thin film transistors, in other embodiments of the present invention, the driving units 5 may also be other switches, which is not limited in the present invention.
It should be understood that the design of each film layer in the functional film layer 7 can be adjusted according to actual needs, and the invention is not limited thereto.
In order to avoid that the driving units in the driving circuit layer are affected by stretching during the stretching process, and to ensure the safety of the driving units, the extent to which the display device can be stretched is often small, in an embodiment of the present invention, as shown in fig. 1, the driving units 5 in the driving circuit layer are disposed in the gaps between two adjacent protrusions 3, when the display device is stretched, the protrusions 3 are unfolded, and the driving units 5 in the gaps between two adjacent protrusions 3 are not stretched, so that the safety of the driving units 5 can be ensured while the stretchability of the display device is increased.
When the display device is stretched, the wires 6 in the driving circuit layer are likely to crack or even break, so in an embodiment of the present invention, the protrusions 3 on the elastic substrate 2 are disposed below the wires 6 in the driving circuit layer, that is, the wires 6 in the driving circuit layer are routed above the protrusions 3, wherein the shape of the lower surface of the portion of the wires 6 disposed on the protrusions 3 is the same as the shape of the protrusions 3, when the display device is stretched, the protrusions 3 are unfolded, the unfolding of the wires 6 disposed on the protrusions 3 is buffered, the stress of the wires 6 in the stretching process is balanced, and thus the problem of breaking of the wires 6 in the stretching process is avoided.
In order to make the display device have higher stretchability, in an embodiment of the present invention, the wires 6 are routed along the protrusions 3, that is, the shapes of the upper and lower surfaces of the portion of the wires 6 disposed on the protrusions 3 are kept consistent with the shape of the protrusions 3, when the display device is stretched, the protrusions 3 are unfolded, so that the wires 6 routed on the protrusions 3 are also unfolded, and in the whole process, the wires 6 are not stretched due to the stretching of the display device, the actual length of the wires 6 is not lengthened, and the problem of breakage of the wires 6 in the stretching process is effectively avoided.
However, in the actual manufacturing process of the display device, to achieve the optimal performance of the display device, the wires 6 and the driving units 5 can be stretched and protected, the driving circuit layer is prepared on the elastic substrate 2 and the protrusions 3, the wires 6 in the driving circuit layer need to be routed on the protrusions 3, the driving units 5 are arranged in the gaps between two adjacent protrusions 3, the routing distribution of the wires 6 is often complicated, and the process difficulty of the subsequent mask is increased.
In an embodiment of the present invention, the material of the protrusion 3 is a flexible organic material, and the flexibility of the flexible organic material can provide a buffer effect for the driving unit 5 and the wires 6 when the display device is stretched. In an embodiment of the invention, the material of the protrusion 3 is polyimide organic glue, and the polyimide organic glue has low oxygen content and high plasticity and toughness after curing, so that the problem of good stretching performance in the stretching process and water-oxygen corrosion reduction can be solved.
It should be understood that in other embodiments of the present invention, other adhesives may be used for the material of the protrusion, and the present invention is not limited thereto.
In the process of manufacturing the protrusion 3 on the elastic substrate 2, whatever kind of organic glue is used, the driving unit 5 and the conductive wire 6 may generate a problem of water-oxygen corrosion to some extent due to contact with the organic glue, so in an embodiment of the invention, as shown in fig. 5, the stretchable display device further includes a barrier film 4 disposed between the elastic substrate 2 and the functional film layer 7, wherein the barrier film 4 covers the three-dimensional structure formed by the elastic substrate 2 and the protrusion 3, and a vertical section of the barrier film 4 has a shape identical to a vertical section of the three-dimensional structure formed by the protrusion 3 and the elastic substrate 2.
According to the stretchable display device provided by the embodiment of the invention, the barrier film 4 is arranged between the elastic substrate 2 and the functional film layer 7, and the functional film layer 7 and the elastic substrate 2 are separated by the barrier film 4, so that the problem of water-oxygen corrosion caused by a flexible organic material used for preparing the protrusion is effectively solved.
An embodiment of the present invention provides a method of manufacturing a stretchable display device, as shown in fig. 6, including:
step 101: providing a rigid base plate, and preparing an elastic substrate on the rigid base plate.
Step 102: a plurality of bulges are prepared on the elastic substrate, and the elastic substrate and the bulges form a three-dimensional structure.
In an embodiment of the present invention, the material of the protrusion is a flexible organic material, in other embodiments of the present invention, the material of the protrusion is also a polyimide organic glue, in other embodiments of the present invention, the material of the protrusion may also be other flexible organic materials, which is not limited in the present invention.
The distribution of the protrusions on the elastic substrate, as mentioned above, is not described herein again.
Step 103: preparing a functional film layer on an elastic substrate provided with a plurality of bulges in an overlapping manner; wherein the functional film layer includes a plurality of film layers required for realizing the normal operation of the display device.
Step 104: the rigid substrate is peeled off.
According to the preparation method of the stretchable display device, the elastic substrate is stretched after the rigid substrate is peeled, and the protrusion on the elastic substrate is unfolded, so that the stretchable degree of the display device is increased.
In an embodiment of the present invention, the functional film layer sequentially includes: the pixel light-emitting device comprises a driving circuit layer, a hole injection layer, a hole transport layer, a pixel light-emitting layer, an electron transport layer, an electron injection layer and a metal cathode layer, wherein the driving circuit layer is used for driving pixels to emit light; the driving circuit layer, the hole injection layer, the hole transport layer, the pixel light-emitting layer, the electron transport layer, the electron injection layer and the metal cathode layer are all formed into a film on a three-dimensional structure consisting of the elastic substrate and the protrusions; the display device prepared by the embodiment of the invention has the advantages that when the display device is stretched, the bulges are unfolded, and the driving units among the bulges are not influenced by stretching.
In the method for manufacturing the stretchable display device, the plurality of the protrusions are arranged on the protrusions at the criss-cross positions of the plurality of the wires, so that the subsequent mask process can be reduced.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.

Claims (6)

1. A stretchable display device, comprising:
an elastic substrate;
a plurality of protrusions provided on the elastic substrate; and
the functional film layer is arranged on the elastic substrate and the surfaces of the plurality of bulges in an overlapping mode;
wherein the functional film layer comprises:
the driving circuit layer is used for driving the pixels to emit light and comprises a plurality of driving units and conducting wires which are respectively and electrically connected with the driving units; and
a pixel light emitting layer arranged on the drive circuit layer
Wherein, at least one wire is arranged on the upper surface of at least one protrusion, and the shape of the upper surface and the lower surface of the part of the wire arranged on the protrusion is the same as that of the protrusion; at least one lead is arranged on the upper surface of at least one bulge at a crisscross position;
the driving unit is disposed in a gap between adjacent two of the protrusions.
2. A stretchable display device according to claim 1, wherein the protrusions are linearly arranged in a predetermined stretching direction in the plane of the elastic substrate.
3. A stretchable display device according to claim 1, wherein the protrusions are arranged in a matrix pattern in the plane of the flexible substrate.
4. A stretchable display device according to claim 1, wherein the material of the protrusions is a flexible organic material.
5. A stretchable display device according to any of claims 1 to 4, wherein the display device further comprises:
and the barrier film is arranged between the elastic substrate and the functional film layer, and covers the elastic substrate and the convex surface, wherein the surface shape of the barrier film is consistent with the convex shape of the convex surface.
6. A method of making a stretchable display device, comprising:
providing a rigid base plate, and preparing an elastic substrate on the rigid base plate;
preparing a plurality of protrusions on the elastic substrate;
preparing a functional film layer on the elastic substrate provided with a plurality of bulges in an overlapping manner; and
peeling off the rigid substrate;
wherein the functional film layer comprises:
the driving circuit layer is used for driving the pixels to emit light and comprises a plurality of driving units and conducting wires which are respectively and electrically connected with the driving units; and
a pixel light emitting layer provided on the driving circuit layer;
wherein, at least one wire is arranged on the upper surface of at least one protrusion, and the shape of the upper surface and the lower surface of the part of the wire arranged on the protrusion is the same as that of the protrusion; at least one lead is arranged on the upper surface of at least one bulge at a crisscross position;
the driving unit is disposed in a gap between adjacent two of the protrusions.
CN201810610027.0A 2018-06-13 2018-06-13 Stretchable display device and preparation method thereof Active CN108847452B (en)

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CN111326068B (en) * 2018-12-13 2022-04-26 昆山工研院新型平板显示技术中心有限公司 Stretchable display panel and display device
WO2020118703A1 (en) * 2018-12-14 2020-06-18 深圳市柔宇科技有限公司 Flexible display screen and pareparation method therefor and flexible display device
CN111326607B (en) * 2018-12-14 2021-05-25 昆山工研院新型平板显示技术中心有限公司 Stretchable display panel, preparation method thereof and stretchable display device
CN111047991B (en) * 2019-12-23 2021-12-07 厦门天马微电子有限公司 Display panel, display device and manufacturing method thereof
CN111429803A (en) * 2020-03-31 2020-07-17 上海天马微电子有限公司 Flexible display panel and display device
CN111599800B (en) * 2020-05-29 2022-04-01 上海天马微电子有限公司 Display panel, display device and preparation method of display panel
CN111785754B (en) * 2020-06-17 2024-10-15 固安翌光科技有限公司 OLED screen body and preparation method thereof
CN115240547B (en) * 2022-06-15 2023-06-23 昆山国显光电有限公司 Display device and method for manufacturing the same

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TW200843570A (en) * 2007-04-18 2008-11-01 Ind Tech Res Inst Stretchable flexible printed circuit (FPC) and fabricating method thereof
GB2521616A (en) * 2013-12-23 2015-07-01 Nokia Technologies Oy A substrate scaffold structure and associated apparatus and methods

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