CN108847134B - Stretchable display screen device and manufacturing method thereof - Google Patents
Stretchable display screen device and manufacturing method thereof Download PDFInfo
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- CN108847134B CN108847134B CN201810609371.8A CN201810609371A CN108847134B CN 108847134 B CN108847134 B CN 108847134B CN 201810609371 A CN201810609371 A CN 201810609371A CN 108847134 B CN108847134 B CN 108847134B
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- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
- G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
- G09F9/301—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED
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Abstract
The present invention provides a stretchable display screen device, comprising: a plurality of light emitting areas including a plurality of functional film layers stacked, the plurality of functional film layers configured to play a display role; and at least one stress release module respectively arranged in the non-light-emitting areas between the two light-emitting areas, wherein the areas where the stress release modules are arranged are filled with stress release materials, and the stress generated in the stretching process of the display screen is absorbed and released by utilizing the performance of the stress release materials so as to realize the stretching of the display screen.
Description
Technical Field
The invention relates to the field of display screens, in particular to a device capable of stretching a display screen and a manufacturing method thereof.
Background
Flexible displays may be classified into arc displays having a curved shape, foldable displays, and bendable or stretchable displays, wherein the arc displays and the foldable displays have been commercially available, recently, there have been attempts to implement organic light emitting displays having a stretchable structure, it is desired to form an organic light emitting display screen to extend/extend or contract and bend when it is pulled, in order to obtain stretchable characteristics, a stretchable substrate is used, however, the substrate is stretchable but metal electrodes, electronic devices, etc. are not stretchable, and since stress generated by extension, contraction, bending generated when the substrate is stretched may cause cracks in the metal electrodes, electronic devices, it has become a technical problem how to implement a stretchable display having high reliability.
Disclosure of Invention
In view of this, embodiments of the present invention are directed to provide a stretchable display device, which solves the problem that a metal electrode and an electronic device crack due to a stress generated during a stretching process of a flexible display.
According to an aspect of the present invention, there is provided a stretchable display screen device including:
a plurality of light emitting areas including a plurality of functional film layers stacked, the plurality of functional film layers configured to function as a display; and at least one stress release module which is respectively and independently arranged at the non-light-emitting area between the two light-emitting areas, wherein the area where the stress release module is located is filled with a stress release material.
In an embodiment, the light emitting regions are arranged in an array, the at least one stress relief module includes a plurality of stress relief modules, and the plurality of stress relief modules are disposed between two adjacent light emitting regions along a row direction and/or a column direction of the array.
In one embodiment, the stress release material is bent in a direction perpendicular to the functional film layer to form a predetermined shape.
Further, the preset shape comprises one or more of the following combinations: convex arc, concave arc, trapezoid, wide at two ends and narrow in the middle.
In one embodiment, the stress relieving material comprises a shape memory polymer material.
Further, the shape memory polymer comprises a combination of one or more of the following materials: epoxy-based polymers and styrene.
In an embodiment, the stress releasing module completely or partially penetrates through the plurality of functional films in a direction perpendicular to the functional films.
In one embodiment, the functional layers include a substrate, an inorganic layer, a thin film transistor device layer, a light emitting layer, and an encapsulation layer, which are sequentially stacked.
In one embodiment, the substrate includes a flexible organic layer and a flexible substrate layer disposed on a surface of the flexible organic layer on a side thereof adjacent to the inorganic layer.
According to another aspect of the present invention, there is also provided a stretchable display device manufacturing method, including:
preparing or providing a rigid substrate, wherein the surface of the rigid substrate comprises a plurality of preset display areas and at least one stress release area, and the at least one stress release area is respectively arranged in a non-light-emitting area between the two display areas; preparing a plurality of superposed functional film layers in the display area to form a light-emitting area playing a display role; coating a stress release material on the stress release area; and peeling off the rigid substrate.
In one embodiment, before coating the stress relieving region with a stress relieving material, the method further comprises:
arranging a die with a preset bending shape along the direction vertical to the functional film layer in the stress release area; wherein coating a stress relief material on the stress relief region comprises: and coating the stress release material on the surface of the mould.
According to the stretchable display screen device provided by the embodiment of the invention, the stress release module is arranged between the two light emitting areas, and the stress generated in the stretching process of the display screen is absorbed and released by the stress release material coated on the stress release module area, so that the stretchable performance of the display screen is realized, and the manufacturing method of the stretchable display screen device is further provided.
Drawings
Fig. 1 is a schematic cross-sectional view illustrating a stretchable display panel according to an embodiment of the invention.
Fig. 2 is a schematic cross-sectional view illustrating a stretchable display panel according to another embodiment of the present invention.
Fig. 3 is a schematic cross-sectional view illustrating a stretchable display panel according to another embodiment of the present invention.
Fig. 4 is a schematic cross-sectional view illustrating a stretchable display panel according to another embodiment of the present invention.
Fig. 5 is a flowchart illustrating a method for manufacturing a stretchable display panel according to an embodiment of the invention.
Fig. 6 is a flow chart illustrating a method for manufacturing a stretchable display panel according to another embodiment of the present invention.
Fig. 7 is a schematic plan view illustrating a structure according to an embodiment of the present invention.
Fig. 8 is a schematic plan view illustrating a structure according to another 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 cross-sectional view illustrating a stretchable display device according to an embodiment of the invention. As shown in fig. 1, the stretchable display screen device includes a plurality of light-emitting regions 2, the light-emitting regions 2 including a plurality of functional film layers stacked, the plurality of functional film layers configured as respective functional module layers for display; and at least one stress release module 1 respectively arranged in the gap of the two light-emitting areas 2, wherein the area where the stress release module 1 is located is filled with a stress release material. Stress relief material refers to a material that is flexible and releases tensile stress during stretching.
Based on the structure of the stretchable display screen device shown in fig. 1, when the display screen device is performing a stretching operation, the stress releasing module 1 can absorb and release the shear stress of the surrounding light emitting region 2 to protect the light emitting region 2 from being damaged or broken by the stress. Therefore, the stress release module is arranged between the two light emitting areas, and the stress generated in the stretching process of the display screen is absorbed and released by the stress release material in the stress release module area, so that the stretching performance of the display screen is realized, and the problem that the stress generated in the stretching process of the display screen can cause the damage of display components is solved.
In an embodiment of the invention, the stress releasing material includes a shape memory polymer material, so that the display screen can automatically return to the original position after being stretched when an external force is removed. In a further embodiment, the shape memory polymer comprises a combination of one or more of the following materials: epoxy-based polymers and styrene.
However, it should be understood that the material of the stress releasing material can be selected according to the actual requirements of the scene, and is not limited to the shape memory polymer material, as long as the stress releasing material has flexibility to release the stress during the stretching process, and the specific material of the stress releasing material is not limited by the present invention.
In an embodiment, the stress releasing module completely or partially penetrates through the plurality of functional films in a direction perpendicular to the functional films.
However, it should be understood that the thickness of the stress releasing module in the direction perpendicular to the functional film may be selected according to actual requirements, as long as the stress releasing module is sufficient to release the stress during the stretching process, and the thickness of the stress releasing module in the direction perpendicular to the functional film is not limited by the present invention.
In an embodiment of the present invention, the functional film layers for forming the light emitting region 2 may include a substrate, an inorganic layer 23, a thin film transistor device layer 24, a light emitting layer 25, and an encapsulation layer 26, which are sequentially stacked, and in this embodiment, the stress relief module 1 corresponds to the functional film layers of the light emitting region 2.
It should be understood that the functional film layers constituting the light-emitting region 2 may be selected according to the practical application requirement, and are not limited to the above-mentioned film layers and the overlapping sequence of the film layers, as long as the light-emitting region can realize the display function of the display screen.
In one embodiment of the invention, the substrate includes a flexible substrate layer 22 to increase the flexibility of the substrate.
In one embodiment of the present invention, the substrate includes a flexible organic layer 21 and a flexible substrate layer 22, and the flexible substrate layer 22 is disposed on a surface of the flexible organic layer 21 on a side close to the inorganic layer 23.
It should be understood that the flexible organic layer 21 and the flexible substrate layer 22 are disposed to increase the flexibility of the substrate, and the flexible organic layer 21 is disposed on the surface of the flexible substrate layer 22 on the side close to the inorganic layer 23 or on the side far from the inorganic layer 23 to achieve the effect, so the relative positions of the flexible organic layer 21 and the flexible substrate layer 22 are not limited.
In a further embodiment, the flexible organic layer 21 comprises a polydimethylsiloxane material and the flexible substrate layer 22 comprises a polyimide material.
It should be understood that the materials of the flexible organic layer 21 and the flexible substrate layer 22 may also be selected according to the actual requirements of the scene, and are not limited to the above polydimethylsiloxane material and the polyimide material, as long as the two materials have flexibility to release the stress during the partial stretching process, and the specific materials of the flexible organic layer 21 and the flexible substrate layer 22 are not limited in the present invention.
In an embodiment of the present invention, the encapsulation layer 26 may be a multilayer composite structure, and the upper surface of the encapsulation layer 26 may further include a flexible organic stretching layer 27, and by the arrangement of the flexible organic stretching layer 27, the stretchability of the light emitting region 2 may be improved, and the stress impact of the display screen on the non-stretchable device in the light emitting region 2 during the stretching process may be further reduced.
Fig. 2, fig. 3 and fig. 4 are schematic cross-sectional views of stretchable display screens according to three embodiments of the present invention. As shown in fig. 2, 3, and 4, the stress releasing material in the embodiment shown in fig. 1 is bent in a direction perpendicular to the functional film layer to form a predetermined shape, and the predetermined shape may include one or more of the following combinations: convex arc, concave arc, trapezoid, wide ends and narrow middle, etc. The light emitting effect is enhanced by reducing the area of the light outlet.
It should be understood that the preset shape may be selected according to the actual scene requirement, and is not limited to the above-mentioned convex arc shape, concave arc shape, trapezoid shape, and shape with two wide ends and narrow middle, as long as the preset shape can increase the transverse width of the stress releasing module to increase the capability of the stress releasing module to absorb and release stress, and the preset shape is not limited in the present invention.
Fig. 5 is a flowchart illustrating a method for manufacturing a stretchable display panel according to an embodiment of the present invention. The stretchable display panel manufacturing method may include the steps of:
step 501: preparing or providing a rigid substrate, and presetting a plurality of display areas and at least one stress release area on the surface of the rigid substrate, wherein the at least one stress release area is respectively arranged in the gap of the two display areas.
The rigid substrate is arranged at the bottom of the display screen and used for supporting the superposition or coating of all functional film layers in the preparation process of the display screen, and has high rigidity strength, so that a pressure-resistant substrate is provided in the preparation process of the display screen, the deformation amount is small, the small integral deformation amount in the preparation process of the display screen can be ensured, and the preparation precision is high. In one embodiment, the rigid substrate may be a glass substrate, but it should be understood that other rigid materials capable of acting as a substrate during display screen fabrication are also possible.
Step 502: and preparing a plurality of superposed functional film layers in the display area to form a light-emitting area for playing a display role.
In one embodiment of the present invention, the plurality of functional film layers for constituting the light emitting region may include a substrate, an inorganic layer 23, a thin film transistor device layer 24, a light emitting layer 25, and an encapsulation layer 26, which are sequentially stacked. The combination of the functional film layers should be understood as a combination method for realizing the display function, as long as the combination structure for realizing the display function is realized, and the structure and the combination mode of each functional film layer are not limited in the present invention.
Step 303: and coating a stress release material on the stress release area. In one embodiment of the present invention, the stress release material includes, but is not limited to, a shape memory polymer material to achieve automatic recovery of the display screen after stretching when the external force is removed. In a further embodiment, the shape memory polymer includes, but is not limited to, a combination of one or more of the following materials: epoxy-based polymers and styrene.
Step 304: the rigid substrate is peeled off to form a stretchable display. After the light emitting area and the stress release module of the display screen are prepared, the rigid substrate is flexibly peeled off from the display screen, and the preparation process of the stretchable display screen is completed. The flexible stripping refers to that a flexible display screen is arranged on a rigid substrate to prepare a display device, and the display screen is separated from the rigid substrate after the preparation is finished.
Fig. 6 is a flowchart illustrating a method for manufacturing a stretchable display panel according to another embodiment of the present invention. A step of implementing the curved shape of the stress relief region is added between step 501 and step 502 of the embodiment shown in fig. 3, and the specific steps are as shown in fig. 4:
step 601: preparing or providing a rigid substrate, and presetting a plurality of display areas and at least one stress release area on the surface of the rigid substrate, wherein the at least one stress release area is respectively arranged in the gap of the two display areas.
Step 602: a curved abrasive tool is positioned in the stress relief area.
Step 603: and preparing a plurality of superposed functional film layers in the display area to form a light-emitting area for playing a display role.
Step 604: and coating a stress release material on the stress release area.
Step 605: the rigid substrate is peeled off to form a stretchable display.
In order to realize the stretching operation of the display screen, the invention provides a stretchable display screen device, wherein non-stretchable devices and the like of the display screen are arranged in a display area, a stress release module capable of stretching operation is arranged around a light-emitting area, and the stress release module absorbs the stress generated when the display screen is stretched, so that the light-emitting area and the non-stretchable devices in the light-emitting area are prevented from failing or being damaged due to the influence of the stretching stress, and fig. 7 and 8 are respectively schematic structural diagrams of two embodiments of the planar structure of the stretchable display screen.
In an embodiment of the invention, the light emitting regions 2 and the stress relief modules 1 each include a plurality of portions, the light emitting regions 2 are arranged in an array, and the light emitting regions 2 and the stress relief modules 1 are staggered, the light emitting regions 2 and the stress relief modules 1 may be staggered along one direction of the array, for example, a row direction or a column direction of the array, while the light emitting regions 2 and the stress relief modules 1 in the other direction are all continuous and integrated structures.
In an embodiment of the present invention, the light emitting regions 2 and the stress releasing modules 1 are arranged in a staggered manner along two directions perpendicular to each other, for example, a row direction and a column direction of the array, that is, different portions of the light emitting regions 2 are separated by the stress releasing modules 1, and different portions of the stress releasing modules 1 are also separated by the light emitting regions 2, so that the capability of the light emitting regions 2 to absorb tensile stress is further improved, and the protection capability of the stress releasing modules 1 is also improved.
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 (7)
1. A stretchable display screen device, comprising:
the light-emitting diode comprises a plurality of light-emitting areas and a plurality of light-emitting areas, wherein the light-emitting areas comprise a plurality of superposed functional film layers, the functional film layers comprise a substrate, an inorganic layer, a thin film transistor device layer, a light-emitting layer and a packaging layer which are sequentially superposed, the upper surface of the packaging layer comprises a flexible stretching organic layer, and the functional film layers are constructed to play a display role; and
the stress release module is arranged between the two light-emitting areas and is used for absorbing and releasing the shear stress of the surrounding light-emitting areas, wherein the area where the stress release module is located is filled with a stress release material, and the stress release material comprises a shape memory polymer material;
the stress release module completely penetrates or partially penetrates through the functional film layers in the direction perpendicular to the functional film layers; the encapsulation layer includes a multilayer composite structure.
2. The device according to claim 1, wherein the light emitting areas are arranged in an array, and the at least one stress relief module comprises a plurality of stress relief modules, and the plurality of stress relief modules are disposed between two adjacent light emitting areas along a row direction and/or a column direction of the array.
3. The device of claim 1, wherein the stress relieving material is bent in a predetermined shape in a direction perpendicular to the functional film layer.
4. The apparatus of claim 3, wherein the predetermined shape comprises a combination of one or more of: convex arc, concave arc, trapezoid, wide at two ends and narrow in the middle.
5. The device of claim 1, wherein the substrate comprises a flexible organic layer and a flexible substrate layer, the flexible substrate layer being disposed on a surface of the flexible organic layer on a side thereof adjacent to the inorganic layer.
6. A method of manufacturing a stretchable display device, the method comprising:
preparing or providing a rigid substrate, wherein the surface of the rigid substrate comprises a plurality of preset display areas and at least one stress release area, and at least one stress release module is used for absorbing and releasing the shear stress of the surrounding light-emitting areas, wherein the at least one stress release area is respectively arranged in the non-light-emitting area between the two display areas;
preparing a plurality of superposed functional film layers in the display area to form a light-emitting area playing a display role; the functional film layers comprise a substrate, an inorganic layer, a thin film transistor device layer, a light emitting layer and a packaging layer which are sequentially stacked, wherein the surface of the packaging layer comprises a flexible stretching organic layer, and the packaging layer comprises a multilayer composite structure;
coating a stress release material on the stress release area; the stress release material comprises a shape memory polymer material, and the stress release module completely or partially penetrates through the functional film layers in the direction perpendicular to the functional film layers; and
peeling off the rigid substrate.
7. The method of claim 6, wherein prior to coating the stress relief region with a stress relief material, further comprising:
arranging a die with a preset shape bent in a direction perpendicular to the functional film layer in the stress release region;
wherein coating a stress relief material on the stress relief region comprises:
and coating the stress release material on the surface of the mould.
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| CN109523921B (en) * | 2018-12-12 | 2021-07-23 | 上海天马有机发光显示技术有限公司 | Flexible display panel and display device |
| 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 |
| KR20200078176A (en) * | 2018-12-21 | 2020-07-01 | 엘지디스플레이 주식회사 | Stretchable display device |
| CN109637419A (en) * | 2019-01-09 | 2019-04-16 | 云谷（固安）科技有限公司 | Display panel and display device |
| CN109786428B (en) * | 2019-01-28 | 2021-03-26 | 京东方科技集团股份有限公司 | Tensile display device and preparation method |
| CN109860205A (en) * | 2019-02-01 | 2019-06-07 | 云谷（固安）科技有限公司 | A kind of display back board structure and stretchable display device |
| CN111627325B (en) * | 2019-02-27 | 2022-05-13 | 昆山工研院新型平板显示技术中心有限公司 | Display panel mother board, display panel and preparation method of display panel |
| CN109767693B (en) * | 2019-02-27 | 2021-01-01 | 昆山工研院新型平板显示技术中心有限公司 | Display panel manufacturing method, display panel and display device |
| CN110189640B (en) * | 2019-07-02 | 2020-11-10 | 京东方科技集团股份有限公司 | Stretchable display substrate, manufacturing method thereof and display device |
| 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 |
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