CN111326607B - Stretchable display panel, preparation method thereof and stretchable display device - Google Patents

Abstract

Embodiments of the present invention disclose a stretchable display panel, a preparation method thereof, and a stretchable display device. The stretchable display panel includes: a device layer, including a substrate, a plurality of pixel units on the substrate, and wires connected to the pixel units; an elastic cladding body, covering the device layer, including a first cladding layer and a second cladding layer Two cladding layers, the first cladding layer, the device layer and the second cladding layer are stacked in sequence, wherein the first cladding layer is arranged close to the wire, the first cladding layer is provided with a plurality of grooves, and the grooves are used for Accommodates the stretched wire. According to the embodiment of the present invention, the warpage of the wire can be limited and the deformation can be reduced, and the patterned structure of the groove can prevent the wire from rubbing against the elastic coating and prevent the wire from breaking.

Description

Stretchable display panel, preparation method thereof and stretchable display device

Technical Field

The invention relates to the technical field of display, in particular to a stretchable display panel, a preparation method of the stretchable display panel and a stretchable display device.

Background

With the continuous development of electronic display technology, the requirements of users on the display devices of electronic devices are higher and higher. Stretchable displays, which are one of the important development directions of display devices of electronic devices, are receiving more and more attention.

The stretchable display has the characteristic that the display can be pressed down or stretched according to the original plane shape on the premise of keeping the image quality, and the stretchable display is not only suitable for eyecatching mobile phones, but also can become a practical function of wearable display equipment such as intelligent watches, fitness trackers and the like.

However, in the stretchable display, the conductive wires may be warped due to stress applied thereto during stretching, and the conductive wires may be easily broken at the warped portions.

Disclosure of Invention

The embodiment of the invention provides a stretchable display panel, a preparation method thereof and a stretchable display device, which can limit the warping amplitude of a wire.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, an embodiment of the present invention provides a stretchable display panel, including:

the device layer comprises a substrate, a plurality of pixel units and wires, wherein the pixel units are positioned on the substrate, and the wires are connected with the pixel units;

elastic coating body, cladding the device layer, including first cladding and second cladding, first cladding the device layer with the second cladding sets up in proper order range upon range of, wherein, first cladding is close to the wire sets up, first cladding is equipped with a plurality of recesses, the recess is used for holding after the drawing the wire.

According to the stretchable display panel provided by the embodiment of the invention, the first cladding layer is arranged in direct contact with the plurality of pixel units, the groove comprises two side surfaces and a top surface, and a gap is formed between the top surface and the conducting wire.

According to the stretchable display panel provided by the embodiment of the invention, a plurality of protrusions are arranged in the groove.

According to the stretchable display panel provided by the embodiment of the invention, the height of the protrusion is 2% -10% of the thickness of the first coating layer above the conductive wires.

According to the stretchable display panel provided by the embodiment of the invention, the shape of the longitudinal section of the protrusion is one or more of the following: triangular, rectangular, trapezoidal.

According to the stretchable display panel provided by the embodiment of the invention, the spacing distance between the adjacent protrusions is between 2.5 and 21 micrometers.

According to the stretchable display panel provided by the embodiment of the invention, the elastic coating body is formed by a transparent elastic material, and the elastic material comprises one or more of the following: poly N, N-dimethylacrylamide PDMA, polyimide PI.

According to the stretchable display panel provided by the embodiment of the invention, the thickness of each of the first cladding layer and the second cladding layer is between 100 and 500 μm.

In a second aspect, an embodiment of the present invention provides a method for manufacturing a stretchable display panel, including:

manufacturing a device layer, wherein the device layer comprises a substrate, a plurality of pixel units and wires connected with the pixel units, and the pixel units are positioned on the substrate;

the manufacturing method comprises the steps of manufacturing an elastic coating body, coating the device layer, wherein the elastic coating body comprises a first coating layer and a second coating layer, the first coating layer is sequentially stacked on the device layer and the second coating layer, the first coating layer is close to the wire, the first coating layer is provided with a plurality of grooves, and the grooves are used for accommodating the stretched wire.

In a third aspect, an embodiment of the present invention provides a stretchable display device, including the stretchable display panel of the first aspect.

The embodiment of the invention provides a stretchable display panel, a preparation method and a stretchable display device. The stretchable display panel comprises a device layer, a plurality of first conductive lines and a plurality of second conductive lines, wherein the device layer comprises a substrate, a plurality of pixel units and wires connected with the pixel units; elastic coating body, cladding device layer, including first cladding and second cladding, first cladding, device layer and second cladding stack gradually the setting, and wherein, first cladding is close to the wire setting, and first cladding is equipped with a plurality of recesses, and the recess is used for holding the wire after the drawing. According to the embodiment of the invention, the warping amplitude of the lead can be limited, the deformation amount of the screen body during stretching can be reduced, and further, the bulge arranged in the groove can avoid friction between the lead and the elastic coating body, so that the lead is prevented from being broken.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the embodiments of the present invention will be briefly described below, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic top view of a stretchable display panel provided by an embodiment of the present invention;

FIG. 2 shows a schematic partial cross-sectional view in the direction A-A of FIG. 1;

FIG. 3 shows a schematic partial cross-sectional view in the direction B-B shown in FIG. 1;

FIG. 4 is a partially enlarged schematic view illustrating a first structure of the stretchable display panel region C shown in FIG. 3;

FIG. 5 is a partially enlarged schematic view illustrating a second structure of the stretchable display panel region C shown in FIG. 3;

fig. 6 is a partially enlarged schematic view illustrating the stretchable display panel region C shown in fig. 3 when stretched.

Wherein:

100-a stretchable display panel; 10-a device layer; 11-a substrate; 12-a pixel cell; 13-a wire;

20-an elastic coating body; 21-a first coating layer; 22-a second coating layer; 23-a groove; 24-projection.

Detailed Description

Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

The following description is given with reference to the orientation words as shown in the drawings, and is not intended to limit the specific structure of the present invention. In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.

For a better understanding of the present invention, the stretchable display panel according to an embodiment of the present invention will be described in detail below with reference to fig. 1 to 6.

Referring to fig. 1 to 3 together, fig. 1 is a schematic top view illustrating a stretchable display panel according to an embodiment of the present invention, fig. 2 is a schematic partial cross-sectional view along a-a direction shown in fig. 1, and fig. 3 is a schematic partial cross-sectional view along B-B direction shown in fig. 1. As shown in fig. 1, 2 and 3, an embodiment of the invention provides a stretchable display panel 100, and the stretchable display panel 100 includes a device layer 10 and an elastic cladding body 20. The device layer 10 includes a substrate 11, and a plurality of pixel cells 12 and wires 13 connected to the pixel cells 12 on the substrate 11. The elastic cap 20 encapsulates the device layer 10. The elastic cladding body 20 comprises a first cladding layer 21 and a second cladding layer 22, the first cladding layer 21, the device layer 10 and the second cladding layer 22 are sequentially stacked, wherein the first cladding layer 21 is arranged close to the wire 13, one surface of the first cladding layer 21 close to the wire is provided with a plurality of grooves 23, and the grooves 23 are used for accommodating the stretched wire 13.

The stretchable display panel 100 according to the embodiment of the invention, by using the elastic coating body 20 to coat the device layer 10, can reduce the amount of deformation during stretching because the device layer 10 is coated in the central region of the elastic coating body 20. The grooves 23 arranged along the wires 13 close to the first coating layer 21 of the device layer 10 are used for accommodating the stretched wires 13, so that the warping amplitude of the wires can be limited, and the patterned structure of the grooves 23 can avoid the friction between the wires and the elastic coating body, and prevent the wires from being broken.

In one embodiment of the present invention, as shown in fig. 1 and 2, the device layer 10 may include a substrate 11, and a plurality of pixel units 12 and wires 13 connected to the pixel units 12 disposed on the substrate 11. The first cladding layer 21 is adjacent to the pixel cells 12 and the conductive lines 13 of the device layer. The side of the first cladding layer 21 close to the device layer 10 is provided with a groove 23, the groove 23 is positioned above the conducting wire 13, and the groove 23 is arranged along the conducting wire 13 in a non-contact mode. It should be understood that the grooves 23 are arranged along the extending direction of the wires 13, i.e., when the wires 13 are arranged in a straight line, the grooves 23 are also arranged in a straight line; when the wire 13 is arranged in a curved shape, the groove 23 is also arranged in a curved shape.

Here, the first clad layer 21 is disposed in direct contact with the plurality of pixel units 12, that is, the first clad layer 21 may be attached to a surface of the plurality of pixel units 12. The groove 23 includes two side surfaces and a top surface, the top surface of the groove is located above the conductive line 13, and a gap is formed between the top surface of the groove 23 and the conductive line 13, that is, the groove 23 is spaced from the conductive line 13 by a preset distance, the spacing distance may be 10 μm to 100 μm, and of course, the spacing distance may also be set according to actual requirements. Here, the groove 23 is spaced from the conductive wire 13 by a predetermined distance, so that the conductive wire has a certain movable space in a vertical direction when the screen body is stretched, and the movable space of the conductive wire is limited to a certain range, which limits a warpage amplitude of the conductive wire when stretched.

The width of the groove 23 is greater than the width of the conductive line 13, and the width of the groove 23 is greater than the width of the conductive line 13 by 10 μm to 100 μm, where the width of the groove 23 is a distance between both side surfaces of the groove, but the distance between the side surface of the groove 23 and the conductive line 13 may be set according to actual requirements. The width of the groove 23 is larger than that of the conducting wire 13, so that the conducting wire has a certain movable space in the horizontal direction when the screen body is stretched, the movable space of the conducting wire is limited in a certain range, and the warping amplitude of the conducting wire is limited when the screen body is stretched.

In the embodiment of the invention, the groove 23 of the first coating 21 is arranged along the shape of the wire 13 in a non-contact manner, so that the warping amplitude of the wire during stretching can be limited, the deformation of the wire can be reduced, friction between the wire and the first coating can be avoided, and the wire can be prevented from being broken.

In addition, a plurality of projections 24 are provided on the surface of the groove 23 near the wire 13, that is, the surface of the groove 23 near the wire 13 is an uneven surface. It should be understood that the projection 24 and the recess 23 may be integrally formed. Here, the protrusions 24 are microstructures that are micro-scale structures relative to macro-scale structures, and typically require the use of other tools (e.g., a microscope) to enable observation of the microstructures.

As shown in fig. 4 and 5, the protrusion 24 may be a plurality of protrusions arranged in sequence, and the plurality of protrusions 24 may be spaced apart by an equal predetermined distance. The predetermined distance may be a distance between 2.5 μm and 21 μm. Here, the shape of the plurality of protrusions 24 may be the same, and the cross section of the protrusions 24 in the direction perpendicular to the first clad layer 21 may be rectangular, triangular, trapezoidal, or other irregular shapes, preferably arc-shaped, and the friction force generated between the protrusions and the wire is smaller when the wire is stretched. Of course, the shape of the plurality of protrusions 24 may be different, and the specific shape of the protrusions 24 is not limited as long as friction between the wires 13 and the first coating layer 21 can be avoided and the wires 13 can be prevented from being broken.

Further, the plurality of protrusions 24 may be regularly arranged. For example, when the cross section of the plurality of projections 24 perpendicular to the first clad layer 21 is triangular, the hypotenuses of the plurality of triangles are parallel to each other.

The heights of the plurality of bumps 24 may be equal, and the height of the protrusion of the bumps 24 may be 2% to 10% of the thickness of the corresponding first clad layer 21 above the wires 13. Here, the height of the protrusion 24 may also be set according to actual requirements. The height of the protrusion is set to a suitable range, so that friction between the wires 13 and the first coating layer 21 is avoided, breakage of the wires 13 is avoided, and breakage of the first coating layer 21 is avoided.

In the embodiment of the present invention, as shown in fig. 6, when the stretchable display panel 100 is stretched in the horizontal direction, since the groove 23 has the protrusion 24 on the side facing the conductive wires 13, the warping of the conductive wires 13 can be restricted while preventing the conductive wires 13 from rubbing against the first cladding layer 21, so that the conductive wires 13 can also be prevented from being broken.

As one example, the elastic cover 20 is formed of a transparent elastic material. The elastic material may be one or more of poly N, N-dimethylacrylamide PDMA, polyimide PI, and the like. Since the elastic cover 20 is elastic and transparent, the display of the display panel is not affected while the display panel is stretchable.

In addition, the thickness of the corresponding first cladding layer 21 above the device layer 10 is between 100 μm and 500 μm, and the thickness of the corresponding second cladding layer 22 below the device layer 10 is also between 100 μm and 500 μm. For example, the thickness of the corresponding first clad layer 21 above the device layer 10 is set to 300 μm, and the thickness of the corresponding second clad layer 22 below the device layer 10 is also set to 300 μm.

Here, the thicknesses of the first cladding layer 21 and the second cladding layer 22 are set to a suitable range, the magnitude of the warpage of the conductive lines is limited, the conductive lines are prevented from being broken, and the stretchable display panel is made thin and light and convenient to use.

It should be understood that the lower surface of the device layer 10 is a plane, and there may be an uneven condition on the upper surface of the device layer 10, and when the upper surface of the device layer 10 is a surface with different unevenness, the thicknesses of corresponding different regions of the first cladding layer 21 above the device layer 10 are different, but the side of the first cladding layer 21 far from the device layer 10 is on the same plane. At the same time, the side of the second cladding layer 22 remote from the device layer 10 is also in the same plane. The "plane" referred to herein is a plane parallel to the lower surface of the device layer 10 with respect to the device layer 10.

It should be noted that, in order to ensure lightness and thinness and convenient use of the stretchable display panel, the overall thickness of the stretchable display panel may be less than 1000 μm. Of course, the overall thickness of the stretchable display panel may be set according to actual requirements, and in this case, the thickness of the first cladding layer 21 and the second cladding layer 22 is not limited to be between 100 μm and 500 μm.

As one example, as shown in fig. 1, the structure of the substrate 11 includes a plurality of islands (not shown in the figure) spaced apart from each other and a plurality of bridges (not shown in the figure) connecting each of the plurality of islands, a plurality of pixel units 12 are respectively disposed over the plurality of islands, and a plurality of metal wires 13 are disposed over the plurality of bridges. The plurality of islands and the plurality of bridges may be integrally formed. The substrate 11 may include an organic material having elasticity and ductility, such as polyimide PI.

Here, the structure of the substrate 11 is similar to the island bridge structure, and the elastic clad 20 divided into upper and lower layers by the device layer 10 is actually a unitary structure, that is, the first clad layer 21 and the second clad layer 22 at the non-pixel cell and the non-conductive line are actually in contact.

In addition, each pixel unit 12 includes at least one Organic Light-Emitting Diode (OLED) or Light-Emitting Diode (LED) Emitting red, blue, green, or white Light. The LEDs may be Micro LEDs.

The embodiment of the invention also provides a preparation method of the stretchable display panel, which comprises the following steps,

s100, manufacturing a device layer 10, wherein the device layer 10 comprises a substrate 11, a plurality of pixel units 12 located on the substrate 11 and wires 13 connected with the pixel units 12;

s200, an elastic coating body 20 is manufactured, the device layer 10 is coated, the elastic coating body comprises a first coating layer 21 and a second coating layer 22, the first coating layer 21, the device layer 10 and the second coating layer 22 are sequentially arranged in a stacking mode, the first coating layer 21 is arranged close to the lead 13, a plurality of grooves 23 are formed in the first coating layer 21, and the grooves 23 are used for containing the lead 13 after stretching.

Here, the transparent elastic material may be patterned to form the first cladding layer 21 and the second cladding layer 22. The protrusion 24 in the groove 23 may be an integral structure with the first cladding 21, that is, the first cladding 21, the groove 23, and the protrusion 24 are integrally formed, or may be prepared in multiple times to form the first cladding 21, the groove 23, and the protrusion 24, respectively.

The embodiment of the invention also provides a stretchable display device which comprises the stretchable display panel. The stretchable display device can be a Micro LED display which can be attached to the surface of the skin due to being light, thin and stretchable, and also comprises products or components with any display function, such as a Micro LED television, a digital photo frame, a mobile phone, a tablet personal computer, a navigator and the like.

It should be clear that the embodiments in this specification are described in a progressive manner, and the same or similar parts in the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments. Embodiments of the invention are not limited to the specific steps and structures described above and shown in the drawings. Those skilled in the art may make various changes, modifications and additions or change the order between the steps after appreciating the spirit of the embodiments of the invention. Also, a detailed description of known process techniques is omitted herein for the sake of brevity.

Embodiments of the present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. For example, the algorithms described in the specific embodiments may be modified without departing from the basic spirit of the embodiments of the present invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the embodiments of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims (10)

1. A stretchable display panel, comprising:

the device layer comprises a substrate, a plurality of pixel units and wires, wherein the pixel units are positioned on the substrate, and the wires are connected with the pixel units;

elastic coating body, cladding the device layer, including first cladding and second cladding, first cladding the device layer with the second cladding sets up in proper order range upon range of, wherein, first cladding is close to the wire sets up, first cladding is equipped with a plurality of recesses, the recess is used for holding after the drawing the wire.

2. The stretchable display panel of claim 1, wherein the first cladding layer is disposed in direct contact with the plurality of pixel cells,

the groove includes two side surfaces and a top surface with a space between the top surface and the conductive line.

3. The stretchable display panel of claim 2, wherein a plurality of protrusions are disposed within the grooves.

4. The stretchable display panel according to claim 3, wherein the height of the protrusions is 2% to 10% of the thickness of the first cladding layer above the conductive lines.

5. A stretchable display panel according to claim 3, wherein the shape of the convex longitudinal section is one or more of: triangular, rectangular, trapezoidal.

6. The stretchable display panel according to claim 3, wherein a spacing distance between adjacent protrusions is between 2.5 μm and 21 μm.

7. The stretchable display panel of claim 1, wherein the elastic coating comprises a transparent elastic material; the elastic material comprises one or more of the following: poly-N, N-dimethylacrylamide (PDMA), Polyimide (PI).

8. The stretchable display panel of claim 1, wherein the first cladding layer and the second cladding layer each have a thickness between 100 μ ι η and 500 μ ι η.

9. A preparation method of a stretchable display panel is characterized by comprising the following steps:

manufacturing a device layer, wherein the device layer comprises a substrate, a plurality of pixel units and wires connected with the pixel units, and the pixel units are positioned on the substrate;

the manufacturing method comprises the steps of manufacturing an elastic coating body, coating the device layer, wherein the elastic coating body comprises a first coating layer and a second coating layer, the first coating layer is sequentially stacked on the device layer and the second coating layer, the first coating layer is close to the wire, the first coating layer is provided with a plurality of grooves, and the grooves are used for accommodating the stretched wire.

10. A stretchable display device, characterized in that the stretchable display device comprises the stretchable display panel of any one of claims 1 to 8.

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