Patent Grant
11380221
The present application claims the benefit of and priority to Chinese Patent Application No. 201910569139.0 filed Jun. 27, 2019, the contents of which are incorporated by reference in their entirety herein.
The present disclosure generally relates to the field of display technology and, more particularly, to a display device, a stretchable display panel, and a method for manufacturing the stretchable display panel.
At present, flexible display panels have gained extensive attention. Flexible display panels may be used in wearable devices, such as watches to adapt to body movements, or used in products such as electronic papers since they are deformable, e.g., stretchable and bendable.
Stretchable display panels are important research directions. An existing stretchable display panel is generally divided into a plurality of display units by apertures. The flexible display panel and the stretchable display panel may be stretched and thereby deformed due to the apertures.
It should be noted that the above-mentioned information disclosed in this part are provided only for acquiring a better understanding of the background of the present application and therefore, may include information that is not current technology already known to those of ordinary skill in the art.
According to an aspect of the present disclosure, there is provided a stretchable display panel, comprising:
a stretchable display layer comprising a display area and a non-display area surrounding the display area;
a first elastic layer disposed on a side of the display layer and fixedly connected to the non-display area; and
a second elastic layer disposed on a side of the display layer distal to the first elastic layer, and fixedly connected to the non-display area;
wherein both the first elastic layer and the second elastic layer are transparent materials and have a Young's modulus greater than that of the display layer.
In an exemplary embodiment of the present disclosure, the stretchable display panel further comprises:
a first plastic frame sandwiched between the first elastic layer and the display layer, and located in the non-display area, the first plastic frame being in a ring-shape, wherein the first elastic layer is fixedly connected to the non-display area through the first plastic frame; and
a first filling portion filled in a space enclosed by the first plastic frame, and the first filling portion being liquid or solid having a Young's modulus is not greater than that of the display layer.
In an exemplary embodiment of the present disclosure, the stretchable display panel further comprises:
a second plastic frame sandwiched between the second elastic layer and the display layer, and located in the non-display area, the second plastic frame being in a ring-shape, wherein the second elastic layer is fixedly connected to the non-display area through the second plastic frame; and
a second filling portion filled in a space enclosed by the second plastic frame, and the second filling portion being liquid or solid having a Young's modulus not greater than that of the display layer.
In an exemplary embodiment of the present disclosure, the display area of the display layer comprises a plurality of display units that are spaced apart and through-holes between the display units, wherein the first filling portion or the second filling portion is filled in the through-holes.
In an exemplary embodiment of the present disclosure, the first filling portion and the second filling portion are solid and the first filling portion and the second filling portion have a Young's modulus not less than 5 Mpa and not more than 500 Mpa.
In an exemplary embodiment of the present disclosure, a material of the first filling portion and the second filling portion comprises at least one of polyvinyl chloride, acrylic, and polysulfide.
In an exemplary embodiment of the present disclosure, the first filling portion and the second filling portion are liquid and the first filling portion and the second filling portion have a viscosity not less than 10 cps and not more than 1000 cps.
In an exemplary embodiment of the present disclosure, a material of the first filling portion and the second filling portion comprises a lubricating oil.
In an exemplary embodiment of the present disclosure, the Young's moduli of the first elastic layer and the second elastic layer are not less than 500 Mpa and not more than 5000 Mpa.
In an exemplary embodiment of the present disclosure, a material of the first elastic layer comprises at least one of polydimethylsiloxane, polyurethane, rubber, and polysulfide; and
a material of the second elastic layer comprises at least one of polydimethylsiloxane, polyurethane, rubber, and polysulfide.
In an exemplary embodiment of the present disclosure, the first elastic layer and the second elastic layer have a thickness not less than 20 μm and not more than 200 μm; and the display layer has a thickness not less than 5 μm and not more than 20 μm.
According to an aspect of the present disclosure, there is provided a method for manufacturing a stretchable display panel, comprising:
providing a substrate and a stretchable display layer comprising a display area and a non-display area surrounding the display area;
forming a first elastic layer on the substrate, the first elastic layer being a transparent material and having a Young's modulus greater than that of the display layer;
providing the display layer on a side of the first elastic layer distal to the substrate, and the first elastic layer being fixedly connected to the non-display area;
forming a second elastic layer on a side of the display layer distal to the substrate, the second elastic layer being fixedly connected to the non-display area, and the second elastic layer being a transparent material and having a Young's modulus greater than that of the display layer; and
peeling off the substrate from the first elastic layer.
In an exemplary embodiment of the present disclosure, providing the display layer on a side of the first elastic layer distal to the substrate, and the first elastic layer being fixedly connected to the non-display area, comprises:
forming a ring-shaped first plastic frame on a surface of the first elastic layer distal to the substrate, the first plastic frame being located in the non-display area;
filling a first filling portion in the first plastic frame, the first filling portion being liquid or solid having a Young's modulus not greater than that of the display layer;
providing the display layer on a surface of the first plastic frame distal to the substrate, wherein the first elastic layer is fixedly connected to the non-display area through the first plastic frame;
forming the second elastic layer on a side of the display layer distal to the substrate, the second elastic layer being fixedly connected to the non-display area, comprises:
forming a ring-shaped second plastic frame on a surface of the display layer distal to the substrate, the second plastic frame being located in the non-display area;
filling a second filling portion in the second plastic frame, the second filling portion being liquid or solid having a Young's modulus not greater than that of the display layer;
forming a second elastic layer on a side of the second plastic frame distal to the substrate, the second elastic layer being fixedly connected to the non-display area through the second plastic frame.
In an exemplary embodiment of the present disclosure, providing the display layer on a side of the first elastic layer distal to the substrate, and the first elastic layer being fixedly connected to the non-display area, comprises:
forming a ring-shaped first plastic frame on a surface of the first elastic layer distal to the substrate, the first plastic frame being located in the non-display area;
providing the display layer on a surface of the first plastic frame distal to the substrate, wherein the first elastic layer is fixedly connected to the non-display area through the first plastic frame;
forming the second elastic layer on a side of the display layer distal to the substrate, the second elastic layer being fixedly connected to the non-display area, comprises:
forming a ring-shaped second plastic frame on a surface of the display layer distal to the substrate, the second plastic frame being located in the non-display area, and the second plastic frame having a notch;
forming a second elastic layer on a surface of the second plastic frame distal to the substrate, the second elastic layer being fixedly connected to the non-display area through the second plastic frame;
before peeling off the substrate from the first elastic layer, after forming the second elastic layer on the surface of the second plastic frame distal to the substrate, the method further comprises:
injecting a transparent liquid filler into the notch, wherein a portion of the transparent filler filled in the first plastic frame is a first filling portion and a portion of the filler filled in the second plastic frame is a second filling portion; and
blocking the notch.
According to an aspect of the present disclosure, there is provided a display device comprising the stretchable display panel according to any one of the above described.
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.
The accompanying drawings, which are incorporated in and constitute part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. Understandably, the drawings described below are only for illustrating some embodiments of the present disclosure and those of ordinary skill in the art can also derive other drawings based on the drawings without paying any creative labor.
Exemplary embodiments will now be described more fully by reference to the accompanying drawings. However, the exemplary embodiments can be implemented in various forms and should not be understood as being limited to the examples set forth herein. Rather, the embodiments are provided so that this disclosure will be thorough and complete, and the conception of the exemplary embodiments will be fully conveyed to those skilled in the art. The same reference signs in the drawings denote the same or similar structures and detailed description thereof will be omitted. In addition, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale.
Although terms having opposite meanings such as “up” and “down” are used in the description to describe the relationship of one component relative to another component, such terms are used herein only for the sake of convenience, for example, “in the direction illustrated in the figure.” It can be understood that if a device denoted in the drawings is turned upside down, a component described as “above” something will become a component described as “under” something. When a structure is “on” another structure, it probably means that the structure is integrally formed on another structure, or, the structure is “directly” disposed on another structure, or, the structure is “indirectly” disposed on another structure through an additional structure.
Words such as “one,” “an/a,” “the,” “said,” and “at least one” are used herein to indicate the presence of one or more elements, component parts, and others. The terms “including” and “having” have an inclusive meaning which means that there may be additional elements, component parts, and others in addition to the listed elements, component parts, and others. The terms “first,” “second,” and others are used herein only as markers, and they do not limit the number of objects modified after them.
An embodiment of the present disclosure provides a stretchable display panel. As shown in
The display layer 3 is a stretchable structure, and includes a display A1 area and a non-display area A2 surrounding the display area. The first elastic layer 1 is disposed on a side of the display layer 3. The first elastic layer 1 is connected to the display layer 3 by a first connecting part 2. The first connecting part 2 is disposed in the non-display area A2. In an exemplary embodiment, the first connecting part 2 can be the first plastic frame 21 shown in
The second elastic layer 5 is disposed on a side of the display layer 3 distal to the first elastic layer 1. The second elastic layer 5 is connected to the display layer 3 by a second connecting part 4. The second connecting part 4 is disposed in the non-display area A2. The second connecting part 4 is disposed in the non-display area A2. In an exemplary embodiment, the first connecting part 4 can be the second plastic frame 41 shown in
Furthermore, both the first elastic layer 1 and the second elastic layer 5 are made of transparent materials, and their Young's moduli are greater than that of the display layer 3.
In the stretchable display panel according to the embodiment of the present disclosure, the deformation of the display layer 3 in a direction perpendicular to the display layer 3, i.e., the deformation in a direction perpendicular to a stretching direction, may be restricted, a large deformation amount in the direction may be prevented, and damage to a display device or interlayer adhesive failure may be avoided, since the Young's moduli of the first elastic layer 1 and the second elastic layer 5 are greater than that of the display layer 3, thereby ensuring the display effect and improving product reliability.
Each part of the stretchable display panel according to the embodiment of the present disclosure will be described in detail below:
As shown in
As shown in
The thicknesses of the first elastic layer 1 and the second elastic layer 5 are not less than 20 μm and not more than 200 μm. The thicknesses of the first elastic layer 1 and the second elastic layer 5 may be or may not be equal to each other. For example, the first elastic layer 1 and the second elastic layer 5 may have a thickness of 20 μm, 150 μm, 200 μm, etc. The display layer 3 has a thickness not less than 5 μm and not more than 20 μm, for example, 5 μm, 10 μm, or 20 μm.
Positions at which the first elastic layer 1 and the second elastic layer 5 are fixedly connected to the display layer 3 are in the non-display area of the display layer 3. The first elastic layer 1 and the second elastic layer 5 can be fixed to both sides of the display layer 3 through a plastic frame. As shown in
The first plastic frame 21 is sandwiched between the first elastic layer 1 and the display layer 3, and is located in the non-display area of the display layer 3. The first plastic frame 21 is in a ring shape and an outer periphery of the first plastic frame 21 may be flush with or beyond an outer periphery of the first elastic layer 1, so that the first elastic layer 1 may be fixedly connected to the non-display area of the display layer 3 through the first plastic frame 21. Moreover, in order to ensure that the first plastic frame 21 does not hinder the tensile deformation of the display layer 3, the Young's modulus of the first plastic frame 21 is not greater than the Young's modulus of the display layer 3. The material of the first plastic frame 21 may be a UV adhesive, a thermosetting adhesive, or the like.
The first filling portion 22 is a transparent structure with the transparency of more than 90%, and may be filled in a space enclosed by the first plastic frame 21. The first filling portion 22 defines, buffers and can also support the display layer 3 in a direction perpendicular to the stretching direction, avoiding vacancy between the first elastic layer and the display area.
The first filling portion 22 may be liquid, such as lubricating oil or aerosol. If the liquid is lubricating oil, its viscosity is not less than 10 cps and not more than 1000 cps, such as 10 cps, 50 cps, 100 cps, or 1000 cps. If the first filling portion 22 is lyosol, its viscosity is not less than 10 cps and not more than 10000 cps.
Alternatively, the first filling portion 22 may also be solid whose Young's modulus is not greater than that of the display layer 3. The Young's modulus of the first filling portion 22 is not less than 5 MPa and not greater than 500 Mpa, for example, 5 Mpa, 10 Mpa, 100 Mpa, or 500 Mpa. The material of the first filling portion 22 may include at least one of polyvinyl chloride, acrylic, and polysulfide.
In other embodiments of the present disclosure, a first filling layer 2 may also be a continuous transparent layer, as long as it can transmit light and ensure the normal stretching of the display layer 3, and can also connect the first elastic layer 1 and the display layer 3.
As shown in
The second plastic frame 41 is sandwiched between the second elastic layer 5 and the display layer 3, and is located in the non-display area of the display layer 3. The second plastic frame 41 is in a ring-shape and an outer periphery of the second plastic frame 41 may be flush with or beyond an outer periphery of the second elastic layer 5, so that the second elastic layer 5 may be fixedly connected to the non-display area of the display layer 3 through the second plastic frame 41.
Projections of the second plastic frame 41 and the first plastic frame 21 on the same surface of the display layer 3 may coincide, so that the second plastic frame 41 and the first plastic frame 21 are oppositely disposed in a direction perpendicular to the display layer 3, making it beneficial to the force balance of the display layer 3. Furthermore, in order to ensure that the second plastic frame 41 does not hinder the tensile deformation of the display layer 3, the Young's modulus of the second plastic frame 41 is not greater than the Young's modulus of the display layer 3. The material of the second plastic frame 41 may be a UV adhesive, a thermosetting adhesive, or the like.
The second filling portion 42 is a transparent structure with the transparency of more than 90%, and may be filled in a space enclosed by the second plastic frame 41. The second filling portion 42 defines, buffers and can also support the display layer 3 in a direction perpendicular to the stretching direction, avoiding vacancy between the second elastic layer 5 and the display area. Moreover, the second filling portion 42 may also be filled in the through-holes 301 of the display layer 3, which increases the strength of the display layer 3 without affecting the stretching and thus avoids damage caused by stretching. The material of the first filling portion 22 may be certainly used to fill the through-holes 301 of the display layer 3.
The second filling portion 42 may be liquid, such as lubricating oil lyosol. If the liquid is lubricating oil, its viscosity is not less than 10 cps and not more than 1000 cps, such as 10 cps, 50 cps, 100 cps, or 1000 cps. If the second filling portion 42 is lyosol, its viscosity is not less than 10 cps and not more than 10000 cps.
Alternatively, the second filling portion 42 may also be solid whose Young's modulus is not greater than that of the display layer 3. For example, the Young's modulus of the second filling portion 42 is not less than 5 Mpa and not more than 500 Mpa, for example, 5 Mpa, 10 Mpa, 100 Mpa, or 500 Mpa. The material of the second filling portion 42 may include at least one of polyvinyl chloride, acrylic, and polysulfide.
In other embodiments of the present disclosure, the second connection layer 4 may also be a continuous adhesive layer, as long as it can transmit light and ensure the normal stretching of the display layer 3, and can also connect the second elastic layer 5 and the display layer 3.
Embodiments of the present disclosure provide a method for manufacturing a stretchable display panel. The stretchable display panel may be the stretchable display panel in the above-described embodiments and details of the stretchable display panel will not be described in detail here. As shown in
In step S110, a substrate and a stretchable display layer are provided, wherein the display layer includes a display area and a non-display area surrounding the display area.
In step S120, a first elastic layer is formed on the substrate, wherein the first elastic layer is a transparent material and has a Young's modulus greater than that of the display layer.
In step S130, the display layer is provided on a side of the first elastic layer distal to the substrate, wherein the first elastic layer is fixedly connected to the non-display area.
In step S140, a second elastic layer is formed on a side of the display layer distal to the substrate, wherein the second elastic layer is fixedly connected to the non-display area, and the second elastic layer is a transparent material and has a Young's modulus greater than that of the display layer.
In step S150, the substrate is peeled off from the first elastic layer.
For the beneficial effects of the manufacturing method according to the embodiment of the present disclosure, reference may be made to the beneficial effects of the stretchable display panel described above, which will not be described in detail here.
The steps of the manufacturing method according to the embodiment of the present disclosure will be described in detail below:
In step S110, a substrate and a stretchable display layer are provided, wherein the display layer includes a display area and a non-display area surrounding the display area.
As shown in
In step S120, a first elastic layer is formed on the substrate, wherein the first elastic layer is a transparent material and has a Young's modulus greater than that of the display layer.
As shown in
In step S130, the display layer is provided on a side of the first elastic layer distal to the substrate, wherein the first elastic layer is fixedly connected to the non-display area.
For the specific structure of the display layer 3, reference may be made to the above-described embodiments of the stretchable display panel, which will not be elaborated here.
As shown in
In one embodiment, as shown in
In step S1310, a ring-shaped first plastic frame is formed on a surface of the first elastic layer distal to the substrate, wherein the first plastic frame is located in the non-display area.
As shown in
When the first plastic frame 21 is formed, an adhesive layer for forming the first plastic frame 21 may be coated on the surface of the first elastic layer 1 distal to the substrate 100 at first and then the adhesive layer is cured by heat curing, light curing or moisture curing to obtain the first plastic frame 21. The curing process depends on the material of the first plastic frame 21.
In step S1320, a first filling portion is filled in the first plastic frame, wherein the first filling portion is liquid or solid having a Young's modulus not greater than that of the display layer.
As shown in
The first filling portion 22 may be liquid, such as lubricating oil or lyosol. If the liquid is lubricating oil, its viscosity is not less than 10 cps and not more than 1000 cps, such as 10 cps, 50 cps, 100 cps, or 1000 cps. If the first filling portion 22 is lyosol, its viscosity is not less than 10 cps and not more than 10000 cps.
Alternatively, the first filling portion 22 may also be solid whose Young's modulus is not greater than that of the display layer 3. The Young's modulus of the first filling portion 22 is not less than 5 MPa and not greater than 500 Mpa, for example, 5 Mpa, 10 Mpa, 100 Mpa, or 500 Mpa. The material of the first filling portion 22 may include at least one of polyvinyl chloride, acrylic and polysulfide.
In step S1330, the display layer is provided on a surface of the first plastic frame distal to the substrate, wherein the first elastic layer is fixedly connected to the non-display area through the first plastic frame.
The display layer 3 may be attached to the surface of the first plastic frame 21 distal to the substrate 100, and to a surface of the first filling portion 22 distal to the substrate 100. The display layer 3 may be rolled and pressed by a roller so that the display layer 3 is tightly bonded thereto.
In step S140, a second elastic layer is formed on a side of the display layer distal to the substrate, wherein the second elastic layer is fixedly connected to the non-display area, and the second elastic layer is a transparent material and has a Young's modulus greater than that of the display layer.
In an embodiment, as shown in
In step S1410, a ring-shaped second plastic frame is formed on a surface of the display layer distal to the substrate, wherein the second plastic frame is located in the non-display area.
As shown in
Projections of the second plastic frame 41 and the first plastic frame 21 on the same surface of the display layer 3 may coincide, so that the second plastic frame 41 and the first plastic frame 21 are oppositely disposed in a direction perpendicular to the display layer 3, making it beneficial to the force balance of the display layer 3. Furthermore, in order to ensure that the second plastic frame 41 does not hinder the tensile deformation of the display layer 3, the Young's modulus of the second plastic frame 41 is not greater than the Young's modulus of the display layer 3. The material of the second plastic frame 41 may be a UV adhesive, a thermosetting adhesive, or the like.
In step S1420, a second filling portion is filled in the second plastic frame, wherein the second filling portion is liquid or solid having a Young's modulus not greater than that of the display layer.
As shown in
The second filling portion 42 may be liquid, such as lubricating oil aerosol. If the liquid is lubricating oil, its viscosity is not less than 10 cps and not more than 1000 cps, such as 10 cps, 50 cps, 100 cps, or 1000 cps. If the second filling portion 42 is lyosol, its viscosity is not less than 10 cps and not more than 10000 cps.
Alternatively, the second filling portion 42 may also be solid whose Young's modulus is not greater than that of the display layer 3. For example, the Young's modulus of the second filling portion 42 is not less than 5 Mpa and not more than 500 Mpa, for example, 5 Mpa, 10 Mpa, 100 Mpa, or 500 Mpa. The material of the second filling portion 42 may include at least one of polyvinyl chloride, acrylic and polysulfide.
In step S1430, a second elastic layer is formed on a side of the second plastic frame distal to the substrate, wherein the second elastic layer is fixedly connected to the non-display area through the second plastic frame.
As shown in
Alternatively, the prefabricated second elastic layer 5 may also be directly attached to a surface of the second connection layer 4 distal to the substrate 100 and may be rolled and pressed by a pressing device with a roller so that the second elastic layer 5 is closely adhered to the second plastic frame 41. It certainly can also be directly fixed on the surface of the display layer 3 without resorting to the second plastic frame 41.
In step S150, the substrate is peeled off from the first elastic layer.
As shown in
As shown in
In step S210, a substrate and a stretchable display layer are provided, wherein the display layer includes a display area and a non-display area surrounding the display area.
In step S220, a first elastic layer is formed on the substrate, wherein the first elastic layer is a transparent material and has a Young's modulus greater than that of the display layer.
In step S230, the display layer is provided on a side of the first elastic layer distal to the substrate, wherein the first elastic layer is fixedly connected to the non-display area.
In step S240, a second elastic layer is formed on a side of the display layer distal to the substrate, wherein the second elastic layer is fixedly connected to the non-display area, and the second elastic layer is a transparent material and has a Young's modulus greater than that of the display layer.
In step S250, the substrate is peeled off from the first elastic layer.
In this embodiment, step S210 may be the same as step S110 described above, step S220 may be the same as step S120 described above and step S250 may be the same as step S150 described above, which will not be described in detail here.
Step S230 includes steps S2310 and S2320 described above, step S2310 may be the same as step S1310 described above and step S2320 may be the same as step S1320 described above. Therefore, the non-display area of the display layer 3 is fixedly connected to the first elastic layer 1 by the first plastic frame 21. For details of the first plastic frame 21, reference may be made to the first plastic frame 21 described above, which is not particularly limited herein.
As shown in
Step S240 of this embodiment may include steps S2410 and S2420.
In step S2410, a ring-shaped second plastic frame is formed on a surface of the display layer distal to the substrate, wherein the second plastic frame is located in the non-display area, and has a notch.
In step S2420, a ring-shaped second plastic frame is formed on a surface of the display layer distal to the substrate, wherein the second plastic frame is located in the non-display area, and has a notch.
As shown in
In step S2420, a second elastic layer is formed on a surface of the second plastic frame distal to the substrate, wherein the second elastic layer is fixedly connected to the non-display area through the second plastic frame.
As shown in
Meanwhile, before step S250 and after step S240, the manufacturing method of this embodiment further includes the following steps:
In step S260, a transparent liquid filler is injected into the notch, wherein a portion of the transparent filler filled in the first plastic frame is a first filling portion and a portion of the filler filled in the second plastic frame is a second filling portion.
As shown in
In addition, the transparent filler may be cured by a curing process such as heat curing or light curing, so that the first filling portion 22 and the second filling portion 42 become solid. The first filling portion 22 and the second filling portion 42 may certainly be in a liquid state without being cured.
In step S270, the notch is blocked.
As shown in
It should be noted that although the various steps of the method of the present disclosure are described in a particular order in the figures, it is not required or implied that the steps must be performed in the particular order, or all the illustrated steps must be performed to achieve the desired result. Additionally or alternatively, some steps may be omitted, or multiple steps may be combined into one step to be performed, and/or one step is decomposed into multiple steps to be performed.
An embodiment of the present disclosure provides a display device including the stretchable display panel in the above-described embodiment. The specific structure and beneficial effects of the stretchable display panel will not be elaborated here. The display device may be used in electronic devices such as mobile phones and tablet computers.
Other embodiments of the present disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed here. This application is intended to cover any variations, uses, or adaptations of the disclosure following the general principles thereof and including such departures from the present disclosure as come within known or customary practice in the art. It is intended that the specification and embodiments be considered as exemplary only, with a true scope and spirit of the present disclosure being indicated by the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 201910569139.0 | Jun 2019 | CN | national |
| Number | Name | Date | Kind |
|---|---|---|---|
| 11127804 | Wang | Sep 2021 | B2 |
| 20130093697 | Sun | Apr 2013 | A1 |
| 20130299789 | Yamazaki | Nov 2013 | A1 |
| 20160087237 | Oh | Mar 2016 | A1 |
| 20160101593 | Nam | Apr 2016 | A1 |
| 20160155966 | Kim | Jun 2016 | A1 |
| 20160211483 | Kwon | Jul 2016 | A1 |
| 20160233453 | Lee | Aug 2016 | A1 |
| 20170032763 | Cheong | Feb 2017 | A1 |
| 20170222178 | Kang | Aug 2017 | A1 |
| 20180130974 | Koo | May 2018 | A1 |
| 20200272202 | Wang | Aug 2020 | A1 |
| 20210159221 | Li | May 2021 | A1 |
| Number | Date | Country |
|---|---|---|
| 103064552 | Apr 2013 | CN |
| 206116400 | Apr 2017 | CN |
| 107768362 | Mar 2018 | CN |
| 108766951 | Nov 2018 | CN |
| 109003951 | Dec 2018 | CN |
| 109326564 | Feb 2019 | CN |
| 20170036875 | Apr 2017 | KR |
| 2011008459 | Jan 2011 | WO |
| Entry |
|---|
| First Office Action for CN Patent Application No. 201910569139.0 dated Nov. 13, 2020. |
| Number | Date | Country | |
|---|---|---|---|
| 20200410907 A1 | Dec 2020 | US |
