CN112133198B - Stretchable display panel and stretchable display device - Google Patents
Stretchable display panel and stretchable display device Download PDFInfo
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- CN112133198B CN112133198B CN202011051431.2A CN202011051431A CN112133198B CN 112133198 B CN112133198 B CN 112133198B CN 202011051431 A CN202011051431 A CN 202011051431A CN 112133198 B CN112133198 B CN 112133198B
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Abstract
The embodiment of the invention provides a stretchable display panel and a stretchable display device, relates to the technical field of display, and reduces the risk of signal line fracture in a stretching bridge. The stretchable display panel includes: the stretchable substrate comprises pixel islands and stretching bridges, wherein every two adjacent pixel islands are connected through the stretching bridges, each pixel island comprises a pixel unit, and each stretching bridge comprises a signal wire electrically connected with the corresponding pixel unit; the first flexible substrate is positioned on one side, back to the light-emitting direction of the stretchable display panel, of the stretchable substrate; the second flexible substrate is positioned on one side of the stretchable substrate facing the light emergent direction of the stretchable display panel; and the pressing structure is positioned between the stretchable substrate and the second flexible substrate, at least partially overlaps the stretching bridge in a direction perpendicular to the plane of the stretchable display panel, and is used for pressing the stretching bridge in a direction pointing to the first flexible substrate along the second flexible substrate when the stretchable display panel is stretched.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of display, in particular to a stretchable display panel and a stretchable display device.
[ background of the invention ]
In recent years, with the continuous development of flexible display technology, the stretchable display panel is gradually applied to the fields of wearable equipment, internet of things equipment, artificial intelligence and the like, and brand-new viewing and use experience is brought to users.
In the prior art, a stretchable display panel includes pixel islands and a stretching bridge, where two adjacent pixel islands are connected by the stretching bridge, the pixel islands are used for carrying a display function device, and the stretching bridge is used for carrying a signal line for providing a signal to the display function device. However, during the stretching process of the stretchable display panel, the signal lines in the stretching bridges are easily broken, thereby adversely affecting signal transmission and affecting the display performance of the stretchable display panel.
[ summary of the invention ]
In view of the above, embodiments of the present invention provide a stretchable display panel and a stretchable display device, which reduce the risk of signal line breakage in a stretching bridge when the stretchable display panel is stretched.
In one aspect, an embodiment of the present invention provides a stretchable display panel, including:
the stretchable substrate comprises a plurality of pixel islands and a plurality of stretching bridges, the pixel islands are arranged at intervals, two adjacent pixel islands are connected through the stretching bridges, each pixel island comprises at least one pixel unit, and each stretching bridge comprises a signal line electrically connected with the corresponding pixel unit;
the first flexible substrate is positioned on one side, back to the light-emitting direction of the stretchable display panel, of the stretchable substrate;
the second flexible substrate is positioned on one side of the stretchable substrate facing the light outlet direction of the stretchable display panel;
a pressing structure located between the stretchable substrate and the second flexible substrate, the pressing structure at least partially overlapping the stretching bridge in a direction perpendicular to a plane of the stretchable display panel, the pressing structure being configured to press the stretching bridge along the second flexible substrate in a direction toward the first flexible substrate when the stretchable display panel is stretched.
In another aspect, an embodiment of the present invention provides a stretchable display device, including the stretchable display panel described above.
One of the above technical solutions has the following beneficial effects:
in the technical scheme provided by the embodiment of the invention, the downward pressing structure is additionally arranged between the second flexible substrate and the stretchable substrate, and the downward pressing structure and the stretching bridge are at least partially overlapped, when the stretchable display panel is stretched, the downward pressing structure can press down the stretching bridge, so that the bulges generated by the stretching bridge are all bulges which are protruded at one side back to the light-emitting direction of the stretchable display panel, the stretching bridge is prevented from generating bulges which are protruded towards the light-emitting direction of the stretchable display panel, and therefore, the signal lines in the bulges generated by the stretching bridge are in a stressed state.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a stretchable display panel according to an embodiment of the present invention;
FIG. 2 is a top view of a stretchable display panel according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A1-A2 of FIG. 2;
FIG. 4 is a schematic diagram illustrating deformation of a stretching bridge when a conventional stretching display panel is stretched;
FIG. 5 is a schematic diagram illustrating deformation of a stretching bridge when a display panel is stretched according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of the location of a raised stretch portion of a stretch bridge provided in accordance with an embodiment of the present invention;
FIG. 7 is a cross-sectional view taken along line B1-B2 of FIG. 6;
FIG. 8 is a schematic view of another embodiment of a tension bridge according to the present invention;
FIG. 9 is a schematic cross-sectional view of a hold-down structure provided by an embodiment of the present invention;
FIG. 10 is a schematic diagram of the cross-sectional width of a hold-down structure provided in accordance with an embodiment of the present invention;
FIG. 11 is a schematic view of another embodiment of a pressing structure according to the present invention;
FIG. 12 is another schematic view of a cross-section of a hold-down structure provided by an embodiment of the present invention;
FIG. 13 is a schematic view of a pressing structure according to another embodiment of the present invention;
FIG. 14 is a schematic cross-sectional view of a hold-down structure provided in accordance with an embodiment of the present invention;
FIG. 15 is another cross-sectional view taken along line A1-A2 of FIG. 2;
fig. 16 is a schematic structural diagram of a stretchable display device according to an embodiment of the present invention.
[ detailed description ] embodiments
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be understood that although the terms first and second may be used to describe the flexible substrates in the embodiments of the present invention, the flexible substrates should not be limited to these terms, which are used only to distinguish the flexible substrates from one another. For example, a first flexible substrate may also be referred to as a second flexible substrate, and similarly, a second flexible substrate may also be referred to as a first flexible substrate, without departing from the scope of embodiments of the present invention.
An embodiment of the present invention provides a stretchable display panel, as shown in fig. 1 to 3, fig. 1 is a schematic structural diagram of the stretchable display panel provided in the embodiment of the present invention, fig. 2 is a top view of the stretchable display panel provided in the embodiment of the present invention, and fig. 3 is a cross-sectional view taken along a direction a1-a2 in fig. 2, where the stretchable display panel includes a first flexible substrate 1, a second flexible substrate 2, a stretchable base plate 3, and a pressing structure 4.
The stretchable substrate 3 includes a plurality of pixel islands 5 and a plurality of stretching bridges 6, the plurality of pixel islands 5 are disposed at intervals, two adjacent pixel islands 5 are connected through the stretching bridges 6, each pixel island 5 includes at least one pixel unit 7, each stretching bridge 6 includes a signal line 8 electrically connected to the pixel unit 7, and each signal line 8 may specifically include one or more signal lines such as a gate line, a data line, and a power signal line.
The first flexible substrate 1 is located on a side of the stretchable substrate 3 opposite to a light emitting direction of the stretchable display panel, and the second flexible substrate 2 is located on a side of the stretchable substrate 3 facing to the light emitting direction of the stretchable display panel, wherein the first flexible substrate 1 and the second flexible substrate 2 may be formed of an organic silicon material with good deformation performance such as Polydimethylsiloxane (PDMS), and the like, and are used for driving the stretchable substrate 3 to stretch and deform when the stretchable display panel is stretched, and generally, the film thickness of the first flexible substrate 1 and the second flexible substrate 2 may be within a range of 50 μm to 500 μm.
The push-down structure 4 is located between the stretchable substrate 3 and the second flexible substrate 2, the push-down structure 4 at least partially overlaps the stretching bridge 6 in a direction perpendicular to a plane of the stretchable display panel, and the push-down structure 4 is used for pushing down the stretching bridge 6 along the direction of the second flexible substrate 2 towards the first flexible substrate 1 when the stretchable display panel is stretched.
It should be noted that the stretchable substrate 3 is not a substrate in the conventional sense, but a display film layer for realizing image display.
The inventors found in their research that, referring to fig. 3 again, the stretching bridge 6 includes a bridge substrate 9, a first insulating layer 10, a signal line 8 and a second insulating layer 11 sequentially disposed along the light-emitting direction of the stretchable display panel, and typically, the thickness of the bridge substrate 9 is in the range of 5 μm to 15 μm, the thickness of the first insulating layer 10 is in the range of 1 μm to 3 μm, the thickness of the signal line 8 is in the range of 0.1 μm to 2 μm, and the thickness of the second insulating layer 11 is in the range of 1 μm to 5 μm, and since the thickness of the bridge substrate 9 is relatively large, the signal line 8 is located closer to the upper surface 12 of the stretching bridge 6 in the overall film structure of the stretching bridge 6.
In the present stretchable display panel without the push-down structure 4, when the stretchable display panel is stretched, as shown in fig. 4, fig. 4 is a schematic diagram of a deformation of a stretching bridge when the present stretchable display panel is stretched, the stretching bridge 6 deforms under the action of a stretching force to generate a first protrusion 13 and a second protrusion 14, the first protrusion 13 protrudes toward one side of the light-emitting direction of the stretchable display panel, and the second protrusion 14 protrudes away from one side of the light-emitting direction of the stretchable display panel. It will be appreciated that during stretching, the tensile bridge 6 has a neutral plane 15, the neutral plane 15 being the central plane of the stress distribution in the tensile bridge 6, the tensile and compressive stresses experienced by the neutral plane 15 being balanced with each other. In the first protrusion 13, the upper surface 12 of the tensile bridge 6 is subjected to tensile deformation, and the film layers between the upper surface 12 and the neutral plane 15 are subjected to tensile stress, and the signal line 8 is also subjected to tensile stress because the signal line 8 is closer to the upper surface 12. In the second protrusion 14, the upper surface 12 of the tensile bridge 6 is compressed and deformed, and the film layer between the upper surface 12 and the neutral plane 15 is subjected to compressive stress, so that the signal traces are also subjected to compressive stress.
Since the signal lines 8 are usually formed of a metal material, and the voltage endurance of the metal material is much higher than the tensile endurance, when the stretching bridge 6 generates the first protrusion 13 protruding toward the light emitting direction of the stretchable display panel, the signal lines 8 are easily broken by the tensile stress, thereby causing the reliability of signal transmission to be affected.
In the stretchable display panel according to the embodiment of the present invention, the pressing structure 4 is additionally disposed between the second flexible substrate 2 and the stretchable substrate 3, and the pressing structure 4 and the stretching bridge 6 are at least partially overlapped, as shown in fig. 5, fig. 5 is a schematic diagram illustrating deformation of the stretching bridge when the stretchable display panel according to the embodiment of the present invention is stretched, when the stretchable display panel is stretched, the pressing structure 4 presses the stretching bridge 6, so that the protrusions generated by the stretching bridge 6 are the second protrusions 14 protruding from one side of the light-emitting direction of the stretchable display panel, and the first protrusions 13 protruding toward the light-emitting direction of the stretchable display panel are prevented from being generated by the stretching bridge 6. The analysis shows that the signal line 8 in the second protrusion 14 generated by the stretching bridge 6 is in a pressed state, and the metal material has high pressure resistance, so that the risk of breaking the signal line 8 in the second protrusion 14 is reduced, the reliability of signal transmission is effectively improved, and the display performance of the stretchable display panel is optimized.
Alternatively, as shown in fig. 6 and 7, fig. 6 is a schematic position diagram of a convex stretching portion of a stretching bridge provided in an embodiment of the present invention, and fig. 7 is a cross-sectional view taken along direction B1-B2 of fig. 6, where the stretching bridge 6 has the convex stretching portion 16, and when the stretchable display panel is stretched, the convex stretching portion 16 is subjected to convex deformation in a direction perpendicular to a plane of the stretchable display panel, and the push-down structure 4 overlaps the convex stretching portion 16 in the direction perpendicular to the plane of the stretchable display panel.
It should be noted that, referring to fig. 6 again, when the stretchable display panel is stretched along the stretching direction S, the stretching force in the stretching direction S can be decomposed into a force in the first direction X and a force in the second direction Y, and the forces in the two directions are applied, so that the area of the stretching bridge 6 where the tangential direction is parallel to the first direction X and the area where the tangential direction is parallel to the second direction Y easily generate protrusions, which are the protrusion stretching portions 16, where the tangential direction is parallel to the plane of the stretchable display panel. When the pressing structure 4 is not provided, the protrusions formed by the protrusion stretching portion 16 when the stretchable display panel is stretched can be understood as the first protrusion 13 and the second protrusion 14 mentioned in the above analysis.
Through making push-down structure 4 and protruding tensile portion 16 overlap, when can stretch the display panel by tensile, push-down structure 4 can push down the protruding deformation that protruding tensile portion 16 produced, avoids protruding tensile portion 16 to bulge towards the light-emitting direction of the display panel that can stretch to protruding tensile portion 16 all is in the pressurized state after the light-emitting direction of the display panel that can stretch is bulged in the dorsad, and the further risk that reduces signal line 8 and fracture.
Optionally, the stretching bridge 6 is an N-level bridge, N is greater than or equal to 1, the stretching bridge 6 has 2N-1 convex stretching portions 16, and when the stretchable display panel is stretched, the 2N-1 convex stretching portions 16 generate convex deformation in a direction perpendicular to a plane of the stretchable display panel. Illustratively, referring again to fig. 6, the draw bridge 6 of fig. 6 is a 2-stage bridge, the draw bridge 6 having 3 raised stretches 16; alternatively, as shown in fig. 8, fig. 8 is another schematic structural diagram of the stretching bridge provided by the embodiment of the invention, and the stretching bridge 6 shown in fig. 8 is a level 1 bridge, and the stretching bridge 6 has 1 convex stretching part 16.
At this time, in order to realize more accurate pressing of the convex stretching portions 16 in the stretching bridge 6, each convex stretching portion 16 is made to protrude from a side opposite to the light emitting direction of the stretchable display panel, at least one pressing structure 4 may be respectively provided at positions of 2N-1 convex stretching portions 16.
In addition, it should be noted that when the stretchable display panel has only one stretching direction, for example, the stretchable display panel can be stretched only along the first direction X, in this case, the stretching bridge 6 may be configured as a multi-level bridge (N ≧ 2) as shown in FIG. 6, or as a 1-level bridge as shown in FIG. 8. When the stretchable display panel has a plurality of stretching directions, for example, the stretchable display panel may be stretched in any direction, in this case, the stretching bridge 6 may be provided as a multi-level bridge (N ≧ 2) as shown in FIG. 6.
Alternatively, as shown in FIGS. 9 and 10, FIG. 9 is a schematic diagram of a cross section of the pressing structure provided by the embodiment of the present invention, FIG. 10 is a schematic diagram of a width of the cross section of the pressing structure provided by the embodiment of the present invention, in a direction perpendicular to the plane of the stretchable display panel, one stretching bridge 6 overlaps with M1 pressing structures 4, and M1 ≧ 1; the push-down structure 4 has a cross-section 19, the cross-section 19 is parallel to a plane of the stretchable display panel, an average width of the cross-section 19 in a first direction X is d, the first direction X is parallel to an extending direction of a shortest connecting line L between the first pixel island 20 and the second pixel island 21, the first pixel island 20 and the second pixel island 21 are two pixel islands 5 connected to the stretching bridge 6 overlapped with the push-down structure 4,
where a is the stretch ratio of the stretchable display panel and L is the spacing between the first pixel islands 20 and the second pixel islands 21.
At the position ofIf the average width d of the cross section 19 of the pressing structure 4 in the first direction X is too small when pressing down the structure 4, the volume of the pressing structure 4 is correspondingly smaller, and then, when the stretchable display panel is stretched, the pressing force applied by the pressing structure 4 to the protruding stretching portions 16 is smaller, so that the protruding stretching portions 16 may still protrude toward the light emitting direction of the stretchable display panel. For this reason, d is set to be greater than or equal to the number of stages of the stretching bridges 6, the number of pull-down structures provided on the stretching bridges 6, the stretching ratio of the stretchable display panel, and the pitch between two adjacent pixel islands 5, by comprehensively considering the factors of the number of stages of the stretching bridges 6, the number of pull-down structures provided on the stretching bridges 6, and the like
It can be ensured that the pressing structure 4 applies sufficient pressing force to the convex stretching portions 16, and that the convex stretching portions 16 all protrude towards the light-emitting direction facing away from the stretchable display panel, so that the signal lines 8 in the convex stretching portions 16 are not easily broken.
It should be noted that, when the cross section of the hold-down structure 4 is in the shape of a rectangle as shown in fig. 9 and 10, the average width of the cross section is the length of the rectangle in the first direction X, and when the cross section of the hold-down structure 4 is in the shape of a trapezoid, a semicircle or other shapes, the average width of the cross section is the average of a plurality of widths of the cross section in the first direction X.
Optionally, referring again to FIG. 10, in the direction perpendicular to the plane of the stretchable display panel, one stretching bridge 6 overlaps M2 hold-down structures 4, M2 ≧ 2; in M2 press-down structures 4, the distance between two adjacent press-down structures 4 is p,
where a is a stretching ratio of the stretchable display panel, L is a distance between the first pixel island 20 and the second pixel island 21, and the first pixel island 20 and the second pixel island 21 are two pixel islands 5 connected to the stretching bridge 6 overlapped with the push-down structure 4, respectively.
When one stretching bridge 6 overlaps M2 hold-down structures 4, in addition to providing hold-down structures 4 at the locations of raised stretching portions 16, it is also possible to provide a structure in which the hold-down structures 4 are locatedOther structures also set up some and push down structure 4, if push down structure 4 that set up arranges comparatively densely, if between two adjacent pull down structures apart from too near, push down the structure 4 and can cause the influence to the normal tensile deformation of the 6 overall structure of tensile bridge to the power of 6 overall structures of tensile bridge, lead to tensile bridge 6 can't drive pixel island 5 position and change. For this, the pitch p between adjacent two pull-down structures is set to be greater than or equal to by comprehensively considering factors such as the number of stages of the pull-down bridges 6, the number of pull-down structures provided on the pull-down bridges 6, the stretch rate of the stretchable display panel, and the pitch between adjacent two pixel islands 5
Enough space can be ensured between two adjacent downward-pressing structures 4, so that the influence of the downward-pressing structures 4 on the normal deformation of the stretching bridge 6 is avoided.
It should be noted that, when the distance between two adjacent hold-down structures 4 is not a constant value, the distance p between two adjacent hold-down structures 4 can be understood as the minimum distance between two adjacent hold-down structures 4, as long as the minimum distance between two adjacent hold-down structures 4 is ensured to be greater than or equal to
Namely, any distance between two adjacent pressing structures 4 is ensured to be larger than or equal to
Optionally, the young's modulus of the pressing structure 4 is greater than the young's modulus of the first flexible substrate 1 and the second flexible substrate 2, at this time, the rigidity of the pressing structure 4 is greater than that of the first flexible substrate 1 and the second flexible substrate 2, and when the stretchable display panel is stretched, the deformation degree of the pressing structure 4 is smaller, so that a sufficient pressing force can be applied to the stretching bridge 6, and it is ensured that the stretching bridge 6 only generates a protrusion protruding away from the light-emitting direction of the stretchable display panel.
In order to further optimize the pressing effect of the pressing structure 4 on the tensile bridge 6, the pressing structure 4 may be formed by using a material with a larger young's modulus, such as a photoresist organic material.
Optionally, the young's modulus of the second flexible substrate 2 is greater than the young's modulus of the first flexible substrate 1, at this time, the second flexible substrate 2 has greater rigidity than the first flexible substrate 1, when the stretchable display panel is stretched, the degree of deformation of the second flexible substrate 2 is smaller, and when the stretching bridge 6 has a tendency to protrude toward the light exit direction of the display panel, the second flexible substrate 2 is not easily protruded upward under the compression of the stretching bridge 6, thereby reducing the probability that the stretching bridge 6 generates a protrusion protruding toward the light exit direction of the display panel.
Further, the young's modulus of the first flexible substrate 1 is E1, the young's modulus of the second flexible substrate 2 is E2, and E1 and E2 may satisfy:
by mixing
Is set to 0.1, it can be avoided that the young's modulus E2 of the second flexible substrate 2 is too small, thereby reducing the probability that the stretching bridge 6 generates a protrusion protruding towards the light exit direction of the display panel, while by setting the minimum value of
The maximum value of the second elastic modulus E2 is set to 0.2, which can prevent the second flexible substrate 2 from being too large and affecting the deformation performance of the second flexible substrate 2, and when the stretchable display panel is stretched, the effect of stretching deformation of the stretchable substrate 3 driven by the second flexible substrate 2 can be improved.
Alternatively, as shown in fig. 11 and 12, fig. 11 is another schematic structural view of the push-down structure provided by the embodiment of the present invention, fig. 12 is another schematic cross-sectional view of the push-down structure provided by the embodiment of the present invention, the stretching bridge 6 includes at least one arc segment bridge 22, the arc segment bridge 22 includes an inner edge 23 and an outer edge 24, and the length of the inner edge 23 is smaller than that of the outer edge 24; the pressing structure 4 has a cross section 19, and the cross section 19 is parallel to the plane of the stretchable display panel; along the direction from the inner edge 23 to the outer edge 24, the width of the cross section 19 increases in a first direction X parallel to the extension direction of the shortest connecting line between the first pixel island 20 and the second pixel island 21, the first pixel island 20 and the second pixel island 21 being two pixel islands 5 connected to the tensile bridge 6 overlapping the hold-down structure 4, respectively.
Because the length of the outer edge 24 of the arc-segment bridge 22 is larger, when the stretchable display panel is stretched, the deformation degree of the region where the outer edge 24 is located is larger, and the protrusion is more easily generated, in the direction pointing to the outer edge 24 along the inner edge 23, by making the width of the transverse plane 19 of the press-down structure 4 in the first direction X increase progressively, the wider part of the press-down structure 4 can be made to be close to one side of the outer edge 24, so as to generate a larger press-down force at the region where the outer edge 24 is located, thereby avoiding the region where the outer edge 24 is located from generating the protrusion protruding in the light emitting manner towards the stretchable display panel to a greater extent.
Further, as shown in fig. 13, fig. 13 is a schematic structural diagram of a pressing structure provided in an embodiment of the present invention, in which the pressing structure 4 overlaps with an inner edge 23 and/or an outer edge 24 of the stretching bridge 6 in a plane perpendicular to the stretchable display panel. At this moment, the pressing structure 4 covers the stretching bridge 6 to a greater extent, and can press the stretching bridge 6 to a greater extent, so that the stretching bridge 6 is prevented from generating a convex protrusion in a light emitting mode facing the stretchable display panel to a greater extent.
Alternatively, along the direction from the inner edge 23 to the outer edge 24, when the width of the cross section 19 in the first direction X increases, the shape of the cross section 19 may be trapezoidal, triangular or semicircular, and in this case, the pressing structure 4 has a conventional shape such as a trapezoid, a cone or a hemisphere, which reduces the complexity of the process for forming the pressing structure 4.
Alternatively, as shown in fig. 14 and 15, fig. 14 is a schematic sectional view taken along a direction a1-a2 in the push-down structure provided in the embodiment of the present invention, fig. 15 is another sectional view taken along a direction a1-a2 in fig. 2, the push-down structure 4 has a section 25, the section 25 is perpendicular to a plane where the stretchable display panel is located, and the section 25 is parallel to a shortest connecting line between a first pixel island 20 and a second pixel island 21, and the first pixel island 20 and the second pixel island 21 are two pixel islands 5 connected to a stretching bridge 6 overlapped with the push-down structure 4 respectively; the cross-section 25 is trapezoidal in shape.
At this time, referring to fig. 14 again, when the stretchable display panel is not stretched, the top surface 26 of the pressing structure 4 is a flat surface, that is, the contact surface between the pressing structure 4 and the second flexible substrate 2 is also a flat surface, compared to the structure of the pressing structure 4 in a cone or a hemisphere, the reliability of the contact between the pressing structure 4 and the second flexible substrate 2 is higher, and the position of the pressing structure 4 is more stable and is not easy to move.
Optionally, referring to FIG. 15 again, the height of the pressing structures 4 in the direction perpendicular to the plane of the stretchable display panel is h, wherein h is greater than or equal to 0.5 μm and less than or equal to 2 μm. Setting the minimum value of h to 0.5 μm can avoid the volume of the hold-down structure 4 being small, and when the stretchable display panel is stretched, the hold-down structure 4 can generate enough hold-down force on the stretching bridge 6 to avoid the stretching portion from generating a protrusion protruding toward the light-emitting direction of the stretchable display panel; the maximum value of h is set to be 2 microns, so that the over-thickness of the pressing structure 4 can be avoided, and the great influence on the overall thickness of the stretchable display panel can be avoided, and the stretchable display panel is more favorably designed to be light and thin.
In addition, the height h of the pressing structure 4 is set to be 0.5-2 microns, the film with the thickness can be realized based on the current process, and the difficulty of the forming process of the pressing structure 4 is reduced.
Based on the same inventive concept, an embodiment of the present invention further provides a stretchable display device, as shown in fig. 16, fig. 16 is a schematic structural diagram of the stretchable display device provided in the embodiment of the present invention, and the stretchable display device includes the stretchable display panel 100. The detailed structure of the stretchable display panel 100 has been described in detail in the above embodiments, and is not described herein again. Of course, the display device shown in fig. 15 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.
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, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (15)
1. A stretchable display panel, comprising:
the stretchable substrate comprises a plurality of pixel islands and a plurality of stretching bridges, the pixel islands are arranged at intervals, two adjacent pixel islands are connected through the stretching bridges, each pixel island comprises at least one pixel unit, and each stretching bridge comprises a signal line electrically connected with the corresponding pixel unit;
the first flexible substrate is positioned on one side, back to the light-emitting direction of the stretchable display panel, of the stretchable substrate;
the second flexible substrate is positioned on one side of the stretchable substrate facing the light outlet direction of the stretchable display panel;
a pressing structure located between the stretchable substrate and the second flexible substrate, the pressing structure at least partially overlapping the stretching bridge in a direction perpendicular to a plane of the stretchable display panel, the pressing structure being configured to press the stretching bridge along the second flexible substrate in a direction towards the first flexible substrate when the stretchable display panel is stretched;
the distance between the signal wire and the upper surface of the stretching bridge is smaller than the distance between the signal wire and the lower surface of the stretching bridge, and the upper surface is the surface of one side, close to the second flexible substrate, of the stretching bridge.
2. The stretchable display panel according to claim 1, wherein the stretching bridge has a convex stretching portion, and when the stretchable display panel is stretched, the convex stretching portion is deformed in a direction perpendicular to a plane of the stretchable display panel;
the push-down structure overlaps the convex stretching portion in a direction perpendicular to a plane of the stretchable display panel.
3. The stretchable display panel of claim 1, wherein the stretching bridge is an N-level bridge, N ≧ 1, the stretching bridge has 2N-1 convex stretching portions, and when the stretchable display panel is stretched, 2N-1 convex stretching portions undergo convex deformation in a direction perpendicular to a plane of the stretchable display panel.
4. A stretchable display panel according to claim 2, wherein one of the stretching bridges overlaps M1 of the pressing structures in a direction perpendicular to a plane of the stretchable display panel, M1 ≧ 1;
the pressing-down structure is provided with a cross section, the cross section is parallel to a plane where the stretchable display panel is located, the average width of the cross section in a first direction is d, the first direction is parallel to the extending direction of the shortest connecting line between the first pixel island and the second pixel island, the first pixel island and the second pixel island are two pixel islands which are connected with the stretching bridge overlapped with the pressing-down structure respectively,
wherein A is a stretch ratio of the stretchable display panel, and L is a distance between the first pixel island and the second pixel island.
5. A stretchable display panel according to claim 2, wherein one of the stretching bridges overlaps M2 of the pressing structures in a direction perpendicular to a plane of the stretchable display panel, M2 ≧ 2;
in M2 the pressing structures, the distance between two adjacent pressing structures is p,
wherein a is a stretching ratio of the stretchable display panel, L is a distance between a first pixel island and a second pixel island, and the first pixel island and the second pixel island are two pixel islands connected to the stretching bridge overlapped with the push-down structure, respectively.
6. The stretchable display panel of claim 1, wherein the young's modulus of the press-down structure is greater than the young's modulus of the first flexible substrate and the second flexible substrate.
7. The stretchable display panel of claim 6, wherein the push-down structures are formed of a light-blocking organic material.
8. The stretchable display panel of claim 1, wherein the young's modulus of the second flexible substrate is greater than the young's modulus of the first flexible substrate.
9. The stretchable display panel of claim 8, wherein the first flexible substrate has a Young's modulus of E1, the second flexible substrate has a Young's modulus of E2,
。
10. the stretchable display panel of claim 1, wherein the stretch bridge comprises at least one arc segment bridge comprising an inner edge and an outer edge, the inner edge having a length less than the length of the outer edge;
the pressing structure is provided with a cross section, and the cross section is parallel to the plane of the stretchable display panel;
and along the direction from the inner edge to the outer edge, the width of the cross section in a first direction is increased progressively, the first direction is parallel to the extending direction of the shortest connecting line between the first pixel island and the second pixel island, and the first pixel island and the second pixel island are two pixel islands connected with the stretching bridge overlapped with the pressing structure respectively.
11. The stretchable display panel according to claim 10, wherein the pressing structures overlap the inner edge and/or the outer edge of the stretching bridge in a plane perpendicular to the stretchable display panel.
12. The stretchable display panel of claim 10, wherein the cross-section has a shape of a trapezoid, a triangle, or a semicircle.
13. A stretchable display panel according to claim 1, wherein the push-down structure has a cross section perpendicular to a plane of the stretchable display panel and parallel to a shortest connecting line between a first pixel island and a second pixel island, the first pixel island and the second pixel island being two of the pixel islands connected to the stretching bridge overlapped by the push-down structure, respectively;
the cross section is trapezoidal in shape.
14. The stretchable display panel of claim 1, wherein the height of the pressing structures in a direction perpendicular to a plane in which the stretchable display panel is located is h, and wherein 0.5 μm ≦ h ≦ 2 μm.
15. A stretchable display device comprising the stretchable display panel according to any one of claims 1 to 14.
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| CN112991942B (en) * | 2021-02-09 | 2024-01-09 | 京东方科技集团股份有限公司 | Stretchable display substrate and display device |
| CN113124273B (en) * | 2021-04-21 | 2022-08-09 | 京东方科技集团股份有限公司 | Display screen stretching device and display system |
| TWI775530B (en) | 2021-07-13 | 2022-08-21 | 友達光電股份有限公司 | Display device |
| CN113593418B (en) * | 2021-08-11 | 2022-11-08 | 武汉华星光电半导体显示技术有限公司 | Display panel, manufacturing method thereof and mobile terminal |
| CN113990193A (en) * | 2021-10-29 | 2022-01-28 | 昆山工研院新型平板显示技术中心有限公司 | Flexible display panel and flexible display screen |
| CN114899203A (en) * | 2022-05-10 | 2022-08-12 | 湖北长江新型显示产业创新中心有限公司 | Stretchable display panel and stretchable display device |
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