CN111276528B - Stretchable display panel, manufacturing method thereof, stretching detection method and display device - Google Patents
Stretchable display panel, manufacturing method thereof, stretching detection method and display device Download PDFInfo
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- CN111276528B CN111276528B CN202010106485.8A CN202010106485A CN111276528B CN 111276528 B CN111276528 B CN 111276528B CN 202010106485 A CN202010106485 A CN 202010106485A CN 111276528 B CN111276528 B CN 111276528B
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/131—Interconnections, e.g. wiring lines or terminals
- H10K59/1315—Interconnections, e.g. wiring lines or terminals comprising structures specially adapted for lowering the resistance
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/10—OLED displays
- H10K59/12—Active-matrix OLED [AMOLED] displays
- H10K59/1201—Manufacture or treatment
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0262—Shape of the specimen
- G01N2203/0278—Thin specimens
- G01N2203/0282—Two dimensional, e.g. tapes, webs, sheets, strips, disks or membranes
Abstract
The invention provides a stretchable display panel, a manufacturing method thereof, a stretching detection method and display equipment, wherein the stretchable display panel comprises the following components: the stretchable display device comprises a stretchable substrate with a plurality of island-shaped structures and a plurality of stretchable bridges, a plurality of display units arranged on the island-shaped structures respectively, a plurality of wires arranged on the stretchable bridges, a stretching strip arranged on the stretchable bridges, and a plurality of wires spanned by the stretching strip, wherein at least one wire is a signal wire connected with the display units. Because under the tensile state of bridge of can stretching, stretch the strip and walk the line simultaneous contact with many, realized many parallelly connected of walking the line, consequently, reduced the impedance of walking the line, avoided walking the problem that line impedance grow influences the display quality of display panel of can stretching when tensile. In addition, because the stretching bar is not contacted with the plurality of wires simultaneously when the stretchable bridge is not stretched, the total impedance of the plurality of wires is basically unchanged before and after stretching, and the display stability of the stretchable display panel is ensured.
Description
Technical Field
The invention relates to the technical field of displays, in particular to a stretchable display panel, a manufacturing method thereof, a stretching detection method and display equipment.
Background
In the existing flexible display device, the stretchable display panel comprises a stretchable part and a non-stretchable part, the non-stretchable part is provided with an electronic component, and the stretchable part is provided with a wiring electrically connected with the electronic component. When the stretchable portion is stretched, the trace may also be stretched, but the impedance may become large when the trace is stretched, which affects the display quality of the stretchable display panel.
Disclosure of Invention
In view of this, the invention provides a stretchable display panel, a manufacturing method thereof, a stretch detection method and a display device, so as to solve the problem that the display quality of the stretchable display panel is affected by the impedance increase during the stretching of the wires.
In order to achieve the purpose, the invention provides the following technical scheme:
a stretchable display panel comprising:
the stretchable substrate comprises a plurality of island-shaped structures and a plurality of stretchable bridges, the plurality of island-shaped structures are arranged at intervals, and the stretchable bridges connect two adjacent island-shaped structures;
a plurality of display units respectively disposed on the plurality of island-like structures;
the plurality of wires are arranged on the stretchable bridge, extend along the stretchable bridge and are not connected with each other, and at least one wire is a signal wire connected with the display unit;
the stretchable display panel comprises a plurality of routing lines, a stretchable bridge and a plurality of stretchable display panels, wherein the stretchable bridge is arranged on the display panel and comprises at least a first state and a second state;
in the first state, the stretchable bridge is not stretched, and the stretching strip is not in contact with the plurality of wires simultaneously;
in the second state, the stretchable bridge stretches, and the stretching strip is in contact with the plurality of wires at the same time, so that the plurality of wires are connected in parallel.
A flexible display device comprising a stretchable display panel as described above.
A method for manufacturing a stretchable display panel comprises the following steps:
forming a plurality of wires on the first substrate, wherein the wires are not connected with each other;
forming a sacrificial layer on the surfaces of the wires, and forming a stretching strip crossing the wires on the surface of the sacrificial layer;
the sacrificial layer is removed, the plurality of routing wires and the stretching strips are transferred to the stretchable bridges of the stretchable substrate, the plurality of routing wires extend along the stretchable bridges, the stretchable substrate comprises a plurality of island-shaped structures and a plurality of stretchable bridges, the plurality of island-shaped structures are arranged at intervals, the stretchable bridges are connected with two adjacent island-shaped structures, display units are arranged on the island-shaped structures, and at least one routing wire is a signal wire connected with the display units.
A stretching detection method of a stretchable display panel is applied to the stretchable display panel and comprises the following steps:
detecting the resistance of at least one of the wires;
and determining the stretching degree of the stretchable display panel according to the resistance of the at least one wire.
Compared with the prior art, the technical scheme provided by the invention has the following advantages:
according to the stretchable display panel, the manufacturing method thereof, the stretching detection method and the display device, the stretching strips crossing the plurality of routing lines are arranged on the stretchable bridge, at least one routing line is a signal line connected with the display unit, and the stretching strips are simultaneously contacted with the plurality of routing lines in the second state of the stretchable display panel, namely in the stretching state of the stretchable bridge, so that the plurality of routing lines are connected in parallel, the total impedance of the plurality of routing lines in the stretching state can be reduced, and the problem that the display quality of the stretchable display panel is influenced due to the fact that the impedance of the routing lines in the stretching state is increased is solved. In addition, since the stretching bar is not in contact with the plurality of wires simultaneously in the first state of the stretchable display panel, i.e. in the state that the stretchable bridge is not stretched, the total impedance of the plurality of wires before and after stretching can be maintained substantially unchanged, and the display stability of the stretchable display panel is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic top view of a stretchable display panel in an unstretched state according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a partial top view of the stretchable display panel shown in FIG. 1 in a stretched state;
FIG. 3 is a schematic cross-sectional view of the stretchable display panel shown in FIG. 1 along a cutting line AA';
FIG. 4 is a schematic cross-sectional view of the stretchable display panel shown in FIG. 2 along a cutting line BB';
fig. 5 is a schematic top view of a suspension portion according to an embodiment of the present invention;
fig. 6 is a schematic top view of another suspension portion according to an embodiment of the present invention;
fig. 7 is a schematic top view of another suspension portion according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another second trace according to an embodiment of the present invention;
FIG. 9 is a schematic structural diagram of another stretchable display panel according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a flexible display device according to an embodiment of the present invention;
fig. 11 is a flowchart illustrating a method for manufacturing a stretchable display panel according to an embodiment of the present invention;
fig. 12 is a schematic cross-sectional structure view of a first substrate and a plurality of traces thereon according to an embodiment of the invention;
fig. 13 is a schematic cross-sectional structure view of a first substrate and a plurality of traces and a sacrificial layer thereon according to an embodiment of the disclosure;
fig. 14 is a schematic cross-sectional view of a first substrate and a plurality of traces and stretching strips thereon according to an embodiment of the present invention;
fig. 15 is a flowchart of a stretch detection method for a stretchable display panel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, so that the above is the core idea of the present invention, and the above objects, features and advantages of the present invention can be more clearly understood. 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.
An embodiment of the present invention provides a stretchable display panel, as shown in fig. 1 and fig. 2, fig. 1 is a schematic top view structure of the stretchable display panel provided in an unstretched state, and fig. 2 is a schematic partial top view structure of the stretchable display panel shown in fig. 1 in a stretched state, where the stretchable display panel includes a stretchable substrate 1, a plurality of display units 2, a plurality of routing lines 3 and stretching bars 4, and of course, the stretchable display panel further includes a gate driving circuit and a driving chip, and details are not repeated herein.
The stretchable substrate 1 includes a plurality of island structures 10 and a plurality of stretchable bridges 11, the plurality of island structures 10 are disposed at intervals, and the stretchable bridges 11 connect two adjacent island structures 10. That is, the island structures 10 are separated structures, one end of the stretchable bridge 11 is connected to one island structure 10, and the other end of the stretchable bridge 11 is connected to another island structure 10, so as to connect two adjacent island structures 10.
Alternatively, the stretchable bridges 11 in the present embodiment are serpentine bridges, i.e. wavy bridges, i.e. the stretchable bridges 11 are serpentine in the bent state in the unstretched state. When the stretchable substrate 1 is not stretched, the stretchable bridges 11 naturally contract into a serpentine shape, and when the stretchable substrate 1 is stretched, the stretchable bridges 11 are stretched to be maximally stretched into an approximately linear state and drive the island-shaped structures 10 to move, so that gaps between the island-shaped structures 10 are increased, but the size and shape of each island-shaped structure 10 do not change, so as to ensure that the display units 2 and the like on the island-shaped structures 10 are not damaged.
In the embodiment of the present invention, only the island-shaped structure 10 is illustrated as a rectangular structure, but the present invention is not limited thereto, and in other embodiments, the island-shaped structure 10 may be a circular or elliptical structure. Also, the shape of the stretchable bridge 11 in the present invention is not limited to the serpentine shape, and in other embodiments, the shape of the stretchable bridge 11 may be a spring shape, a wave shape, or the like.
In the embodiment of the present invention, the plurality of display units 2 are respectively disposed on the plurality of island structures 10. Specifically, one or more display units 2 are disposed on each island structure 10, and the embodiment of the present invention is described by taking an example in which only one display unit 2 is disposed on one island structure 10. The display unit 2 includes a light emitting structure including a light emitting diode, an organic light emitting diode, and the like, and a driving circuit connected to the light emitting structure. And, the light emitting structure includes at least light emitting structures emitting red, green and blue light to realize a display function of the stretchable display panel.
In the embodiment of the present invention, the plurality of wires 3 are disposed on the stretchable bridge 11, the plurality of wires 3 extend along the stretchable bridge 11 and are not connected to each other, and at least one wire 3 is a signal line connected to the display unit 2. That is, when two display units 2 are respectively disposed on two adjacent island structures 10, the wirings connecting the two display units 2 are disposed on the stretchable bridge 11 connecting the two island structures 10, and one end of the wiring is connected to one of the display units 2 and the other end of the wiring is connected to the other display unit 2, so as to realize signal transmission between the display units 2.
The bending form of the plurality of wires 3 is the same as that of the stretchable bridge 11, and the bending form of the plurality of wires 3 changes with the change of the bending form of the stretchable bridge 11, so as to avoid the risk of wire breakage and the like of the wires 3 caused by the change of the bending form of the stretchable bridge 11. That is, when the stretchable bridge 11 is in a serpentine coiled state, the plurality of traces 3 are also in a serpentine coiled state; when the stretchable bridge 11 is in an approximately linear state, the plurality of traces 3 are also in an approximately linear state.
In the present embodiment, the stretch strips 4 are also disposed on the stretchable bridge 11, and the stretch strips 4 span a plurality of tracks 3. In the first state of the stretchable display panel, i.e. in the unstretched state of the stretchable bridge 11, the stretch strip 4 is not in contact with the plurality of tracks 3 simultaneously, that is, the stretch strip 4 may be in contact with one of the plurality of tracks 3, but not with all of the tracks 3 across which it spans simultaneously. In the second state of the stretchable display panel, i.e. in the state where the stretchable bridge 11 is stretched, the stretch bar 4 is in simultaneous contact with the plurality of traces 3, i.e. the stretch bar 4 is in simultaneous contact with all the traces 3 across it, so that the plurality of traces 3 are connected in parallel.
It should be noted that the stretchable display panel in the embodiment of the present invention at least includes a first state and a second state, where the difference between the first state and the second state is whether the stretchable display panel is stretched, and of course, in other embodiments of the present invention, the stretchable display panel may be further divided into a third state and a fourth state according to whether the stretchable display panel is stretched, which is not described herein again. In addition, it should be further noted that the materials of the traces 3 and the stretch strips 4 in the embodiment of the present invention are both conductive materials. Optionally, the materials of the traces 3 and the stretch strips 4 are both metal materials, so that parallel connection between a plurality of traces 3 is realized through the stretch strips 4.
Because under the second state of the display panel that can stretch, under the tensile state of the bridge 11 that can stretch promptly, stretch 4 and many walk line 3 simultaneous contact, realized many and walked the parallelly connected of line 3, consequently, can reduce under the tensile state many and walk the total impedance of line 3, avoided walking the problem that line impedance grow influences the display quality of display panel that can stretch under the tensile state.
In addition, in the first state of the stretchable display panel, that is, in the unstretched state of the stretchable bridge 11, the stretching bar 4 and the plurality of traces 3 are not in contact at the same time, that is, the plurality of traces 3 are not in parallel connection at the same time, so that the total impedance of the plurality of traces 3 before and after stretching can be substantially maintained, and the display stability of the stretchable display panel is ensured.
As shown in fig. 3 and 4, fig. 3 is a schematic cross-sectional structure of the stretchable display panel shown in fig. 1 along a cutting line AA ', and fig. 4 is a schematic cross-sectional structure of the stretchable display panel shown in fig. 2 along a cutting line BB', the stretch bar 4 includes a first connection portion 4a, a second connection portion 4b, a first support portion 4c, a second support portion 4d, and a hanging portion 4 e.
As shown in fig. 3, the first connecting portion 4a and the second connecting portion 4b are respectively located at two sides of the plurality of wires 3, the first connecting portion 4a is located at the left side of the plurality of wires 3, the second connecting portion 4b is located at the right side of the plurality of wires 3, and the first connecting portion 4a and the second connecting portion 4b are connected to the stretchable bridge 11, so that the stretching bar 4 is fixed on the stretchable bridge 11.
The first support portion 4c connects the first connecting portion 4a and the suspended portion 4e, the second support portion 4d connects the second connecting portion 4b and the suspended portion 4e, and the extending directions of the first support portion 4c and the second support portion 4d intersect the plane where the stretchable bridge 11 is located, so that the first support portion 4c and the second support portion 4d support the suspended portion 4e to span across the plurality of traces 3 and suspend above the plurality of traces 3 in a first state.
In the embodiment of the present invention, as shown in fig. 3 and 4, the stretchable bridge 11 further has a first substrate 12 on the surface. Optionally, the first substrate 12 is a Polyimide (PI) substrate. Optionally, the plane of the suspended portion 4e is parallel to the plane of the stretchable bridge 11, and certainly, the plane of the suspended portion 4e may not be parallel to the plane of the stretchable bridge 11, as long as the suspended portion 4e is not in contact with the trace 3 in the first state. In the embodiment of the present invention, only the example in which the cross-sectional shape of the stretched strip 4 is a trapezoid is described, but the present invention is not limited to this, and in other embodiments, the cross-sectional shape of the stretched strip 4 may be a rectangle, a parallelogram, or the like.
In the first state, i.e., the unstretched state, as shown in fig. 3, the first supporting portion 4c and the second supporting portion 4d support the suspending portion 4e to suspend above the plurality of traces 3, and in the second state, i.e., the stretched state, as shown in fig. 4, the stretchable bridge 11, the first substrate 12, the first supporting portion 4c, the second supporting portion 4d, and the like are stretched along the stretching direction Y, so that the suspending portion 4e moves down and contacts with the plurality of traces 3, and since the stretching bar 4 and the plurality of traces 3 are all made of a conductive material, the parallel connection of the plurality of traces 3 can be achieved through the suspending portion 4e of the stretching bar 4.
In the embodiment of the present invention, the projection of the suspended portion 4e on the plane of the stretchable substrate has a rectangular shape, an oval shape or a saddle shape, that is, the projection of the suspended portion 4e in the Z direction may have a rectangular shape, an oval shape or a saddle shape.
As shown in fig. 5, fig. 5 is a schematic top view structure diagram of a suspended portion according to an embodiment of the present invention, a projection of the suspended portion 4e is rectangular, and an extending direction of a long side of the rectangle is the same as an extending direction of the suspended portion 4 e.
As shown in fig. 6, fig. 6 is a schematic top view of another suspension portion according to an embodiment of the present invention, when the projection of the suspension portion 4e is an ellipse, the suspension portion 4e includes a first end e1 and a second end e2 arranged along the long axis direction of the ellipse, the first end e1 is connected to the first support portion 4c, and the second end e2 is connected to the second support portion 4 d.
As shown in fig. 7, fig. 7 is a schematic top view structure diagram of another suspension portion provided by the embodiment of the present invention, when the projection of the suspension portion 4e is shaped like a saddle, the suspension portion 4e includes a first sub-portion 4e1, a second sub-portion 4e2 and a third sub-portion 4e3 arranged along the cross direction, a width L2 of the second sub-portion 4e2 projected in the cross direction is smaller than a width L1 of the first sub-portion 4e1 projected in the cross direction, and a width L2 of the second sub-portion 4e2 projected in the cross direction is smaller than a width L3 of the third sub-portion 4e3 projected in the cross direction. Since the width L2 of the projection of the second sub-portion 4e2 in the direction perpendicular to the crossing direction is small, the weight of the middle portion of the suspended portion 4e can be reduced, so that the first support portion 4c and the second support portion 4d can better support the suspended portion 4e above the plurality of traces 3.
In the embodiment of the present invention, as shown in fig. 1 and fig. 2, the plurality of traces 3 includes at least one first trace 31 and at least one second trace 32, the first trace 31 is a signal line connecting the display units 2 on two adjacent island structures 10, the second trace 32 is arranged in a floating manner in the first state, that is, the second trace 32 is not connected to any circuit structure in the first state, that is, in an unstretched state, and the second trace 32 is connected in parallel to the first trace 31 in the second state, that is, in a stretched state, so as to reduce the impedance of the first trace 31 and prevent the display quality of the display panel from being affected by an excessive impedance of the first trace 31.
In the drawings of the embodiment of the present invention, only one first trace 31 and one second trace 32 are taken as an example for illustration, but the present invention is not limited thereto, and in other embodiments, the plurality of traces 3 may further include a plurality of first traces 31, and the plurality of first traces 31 extend along the stretchable bridge 11 and are disposed in parallel. Based on this, when a certain first wire 31 is broken due to stretching, the other first wires 31 connected in parallel with the certain first wire can also realize signal transmission, thereby ensuring normal display of the stretchable display panel.
Alternatively, in the embodiment of the present invention, as shown in fig. 1, the plurality of island-shaped structures 10 are distributed in an array along a first direction X and a second direction Y, so that the display units 2 are arranged in an array to realize an array display of pixels, where the first direction X is perpendicular to the second direction Y.
Wherein the stretchable bridge 11 includes a first stretchable bridge 111 and a second stretchable bridge 112, the first stretchable bridge 111 is connected with two island-shaped structures 10 adjacent in the first direction X, and the second stretchable bridge 112 is connected with two island-shaped structures 10 adjacent in the second direction Y.
The stretch panel 4 includes a first stretch panel 41 and a second stretch panel 42, the first stretch panel 41 is disposed on the first stretchable bridge 111, the first stretch panel 41 extends in the first direction X, or the extension direction of the first stretch panel 4 intersects with but is not perpendicular to the first direction X, the second stretch panel 42 is disposed on the second stretchable bridge 112, and the second stretch panel 42 extends in the second direction Y, or the extension direction of the second stretch panel 42 intersects with but is not perpendicular to the second direction Y.
Based on this, when the stretchable display panel is stretched in the first direction X, the first stretchable bridge 111 and the first stretching bar 41 are stretched, and the first stretching bar 41 can realize parallel connection of the plurality of wires 3 on the first stretchable bridge 111, so as to reduce the total impedance of the plurality of wires 3 on the first stretchable bridge 111, and avoid the display quality of the stretchable display panel being affected by the increased impedance of the wires 3 on the first stretchable bridge 111.
Moreover, since the first stretch bar 41 extends along the first direction X, or the extending direction of the first stretch bar 4 is not perpendicular to the first direction X, when the stretchable display panel is stretched in the first direction X, the first stretch bar 4 can capture the stretch at the first time, or the first stretch bar 4 can be stretched at the first time, so that the parallel connection of the plurality of traces 3 can be realized at the first time when the traces 3 are stretched, and the sensitivity of the parallel response of the plurality of traces 3 is further improved.
When the stretchable display panel is stretched in the second direction Y, the second stretchable bridge 112 and the second stretching bar 42 are stretched, and the second stretching bar 42 can realize parallel connection of the plurality of wires 3 on the second stretchable bridge 112, so as to reduce the total impedance of the plurality of wires 3 on the second stretchable bridge 112, and avoid the impedance of the wires 3 on the second stretchable bridge 112 from being increased to affect the display quality of the stretchable display panel.
Moreover, since the second stretch strip 42 extends along the second direction Y, or the extending direction of the second stretch strip 42 is intersected with the second direction Y but not perpendicular thereto, when the stretchable display panel is stretched in the second direction Y, the second stretch strip 42 can capture the stretch at the first time, or the second stretch strip 42 can be stretched at the first time, so that the parallel connection of the plurality of traces 3 can be realized at the first time when the traces 3 are stretched, and the sensitivity of the parallel response of the plurality of traces 3 is further improved.
Optionally, the plurality of traces 3 on the first stretchable bridge 111 and the second stretchable bridge 112 include a first trace 31 and a second trace 32, and optionally, the first trace 31 on the first stretchable bridge 111 is a gate line connected to a driving circuit in the display unit 2, so as to implement transmission of a scanning signal through the gate line; the first traces 31 on the second stretchable bridge 112 are data lines connected to the driving circuits in the display unit 2 to implement transmission of data signals through the data lines. Of course, the present invention is not limited thereto, and in other embodiments, the first trace 31 may also be a signal line for transmitting a stretching signal, which is not described herein again.
In the present embodiment, the first stretchable bridge 111 is a serpentine bridge, i.e., a wave-shaped bridge. The overall direction of the first stretchable bridge 111 is the first direction X, and the vibrating direction is the second direction Y, i.e. the first stretchable bridge 111 extends along the first direction X and bends toward the second direction Y. The bending shape of the trace 3 on the first stretchable bridge 111 is the same as the bending shape of the first stretchable bridge 111, and the bending shape of the trace 3 on the first stretchable bridge 111 changes with the change of the bending shape of the first stretchable bridge 111, so as to avoid the risk that the trace 3 on the first stretchable bridge is broken due to the change of the bending shape of the first stretchable bridge 111. In addition, since the first stretchable bridge 111 is bent toward the second direction Y while extending along the first direction X, the first stretching bar 41 is conveniently disposed at the bending region of the first stretchable bridge 111, so that the first stretching bar 41 can be disposed perpendicular to the plurality of traces 3 on the first stretchable bridge 111 while extending in the first direction X.
The second stretchable bridge 112 is a serpentine bridge, i.e. a wave-shaped bridge, the overall direction of the second stretchable bridge 112 is the second direction Y, and the vibrating direction is the first direction X, i.e. the second stretchable bridge 112 extends along the second direction Y and is also bent towards the first direction X. The bending shape of the trace 3 on the second stretchable bridge 112 is the same as the bending shape of the second stretchable bridge 112, and the bending shape of the trace 3 on the second stretchable bridge 112 changes with the change of the bending shape of the second stretchable bridge 112, so as to avoid the risk of the trace 3 on the second stretchable bridge 112 breaking due to the change of the bending shape thereof. In addition, since the second stretchable bridge 112 is bent toward the first direction X while extending along the second direction Y, the second stretching strip 42 is conveniently disposed at the bending region of the second stretchable bridge 112, so that the second stretching strip 42 can be disposed perpendicular to the plurality of traces 3 on the second stretchable bridge 112 while extending in the second direction Y.
In the embodiment of the present invention, one stretch strip 4 may be disposed on each stretchable bridge 11, but the present invention is not limited thereto, and in other embodiments, a plurality of stretch strips 4 may be disposed on each stretchable bridge 11 to prevent a failure of one stretch strip 4 from affecting the parallel connection of a plurality of traces 3.
In the embodiment of the present invention, the second trace 32 on each stretchable strip 11 may be a continuous trace, or the second trace 32 on each stretchable bridge 11 may include a plurality of sub-traces 320, as shown in fig. 8, fig. 8 is a schematic structural diagram of another second trace 32 provided in the embodiment of the present invention, the sub-traces 320 are arranged at intervals, the plurality of sub-traces 320 extend along the extending direction of the stretchable bridge 11 and are sequentially arranged, and each sub-trace 320 is arranged corresponding to one stretching strip 4, based on this, the parallel connection between each sub-trace 320 and the first trace 31 may be realized by each stretching strip 4, so that the risk that the parallel connection effect is affected by the broken line of the second trace 32 may be reduced.
In addition, the stretchable display panel in the embodiment of the present invention further includes a sensor. The sensor is connected with at least one wire 3 and used for detecting the resistance of the wire 3 so as to determine the stretching degree of the stretchable display panel according to the detected resistance value.
Alternatively, as shown in fig. 9, fig. 9 is a schematic structural diagram of another stretchable display panel according to an embodiment of the present invention, where the stretchable display panel includes a first sensor 51 and a second sensor 52, the first sensor 51 is connected to at least one of the traces 3 on the first stretchable bridge 111, and the second sensor 52 is connected to at least one of the traces 3 on the second stretchable bridge 112.
The first sensor 51 is configured to detect a resistance of at least one trace 3 on the first stretchable bridge 111, so as to determine a stretching degree of the stretchable display panel in the first direction X according to the detected resistance value. The second sensor 52 is configured to detect the resistance of at least one trace 3 on the second stretchable bridge 112, so as to determine the stretching degree of the stretchable display panel in the second direction Y according to the detected resistance value.
Based on this, in the embodiment of the present invention, the extent of the stretch of the stretchable display panel in the first direction X and the second direction Y can be detected by the first sensor 51 and the second sensor 52, respectively, thereby improving the accuracy and sensitivity of the stretch detection of the stretchable display panel.
Of course, in other embodiments, the stretchable display panel may also be stretched in other directions, and in embodiments of the present invention, the resistances of the traces on the stretchable bridges in other directions may also be detected by other sensors, so as to determine the stretching degree of the stretchable display panel in the direction according to the resistances.
Alternatively, the traces 3 connected to the first sensor 51 and the second sensor 52 may be the first traces 31 or the second traces 32. In the embodiment of the present invention, only the trace 3 connected to the first sensor 51 and the second sensor 52 is taken as the first trace 31 for illustration, and the invention is not limited thereto.
In the embodiment of the present invention, the first sensor 51 and the second sensor 52 are also connected to the driving chip so that the driving chip controls the brightness, etc. of the display unit 2 according to the degree of stretching of the stretchable display panel. The driving chip is connected to the first trace 31, such as a data line, and is configured to provide a scanning signal to the gate line through a gate driving circuit and provide a data signal to the data line, so as to control the display unit 2 to display an image through the scanning signal and the data signal.
In addition, the driving chip or other processors connected to the first sensor 51 and the second sensor 52 may also determine whether the stretchable display panel is over-stretched according to the stretching degree of the stretchable display panel, and display the determination result through the array of display units 2, so that the user can control the stretching force.
An embodiment of the present invention further provides a flexible display device, as shown in fig. 10, fig. 10 is a schematic structural diagram of a flexible display device provided in an embodiment of the present invention, and the flexible display device P includes the stretchable display panel provided in any embodiment. Alternatively, the flexible display device P includes, but is not limited to, a mobile phone, a tablet computer, a digital camera, and the like.
An embodiment of the present invention further provides a manufacturing method of a stretchable display panel, as shown in fig. 11, where fig. 11 is a flowchart of a manufacturing method of a stretchable display panel provided in an embodiment of the present invention, the method includes:
s101: forming a plurality of wires on the first substrate, wherein the wires are not connected with each other;
in the embodiment of the present invention, the island structures 10 and the stretchable bridges 11 are cut from the flexible substrate, and due to the process limitation, the traces cannot be directly formed on the flexible substrate. Based on this, as shown in fig. 12, fig. 12 is a schematic cross-sectional structure diagram of the first substrate 12 and the plurality of traces thereon according to the embodiment of the present invention, in the embodiment of the present invention, the plurality of traces are formed on the first substrate 12, and the plurality of traces are not connected to each other.
Optionally, the plurality of traces includes a first trace 31 and a second trace 32, and in the embodiment of the present invention, only one first trace 31 and one second trace 32 are taken as an example for description. Optionally, the material of the first substrate 12 is Polyimide (PI), the material of the flexible substrate may be Polyimide (PI), Polycarbonate (PC), polyethylene terephthalate (PET), or the like, and the first trace 31 and the second trace 32 are metal traces.
S102: forming a sacrificial layer on the surfaces of the plurality of routing lines, and forming a stretching strip crossing the plurality of routing lines on the surface of the sacrificial layer;
as shown in fig. 13, fig. 13 is a schematic cross-sectional structure view of the first substrate 12 and the plurality of traces and the sacrificial layer 13 thereon according to the embodiment of the present invention, the sacrificial layer 13 is formed on the surfaces of the plurality of traces, i.e., the first trace 31 and the second trace 32, and the stretch strip 4 crossing the plurality of traces, i.e., the first trace 31 and the second trace 32, is formed on the surface of the sacrificial layer 13. Alternatively, the material of the sacrificial layer 13 is silicon nitride or silicon oxide, etc., and the material of the tensile bar 4 is metal. Optionally, the material of the stretch strip 4 is the same as the material of the first trace 31 and the second trace 32.
S103: the sacrificial layer is removed, a plurality of routing and stretching strips are transferred to the stretchable bridge of the stretchable substrate, the plurality of routing extend along the stretchable bridge, the stretchable substrate comprises a plurality of island-shaped structures and a plurality of stretchable bridges, the plurality of island-shaped structures are arranged at intervals, the stretchable bridges are connected with the two adjacent island-shaped structures, the island-shaped structures are provided with display units, and at least one routing is a signal line connected with the display units.
As shown in fig. 14, fig. 14 is a schematic cross-sectional structure view of the first substrate 12 and the plurality of traces and the stretch strips 4 thereon according to the embodiment of the present invention, because the material of the sacrificial layer 13 is different from the materials of the first trace 31, the second trace 32 and the stretch strips 4, and therefore, the etching speed is also different, so that a specific etching solution can be used to remove the sacrificial layer 13, and the first trace 31, the second trace 32 and the stretch strips 4 on the first substrate 12 are remained, so that the plurality of traces, i.e., the first trace 31 and the second trace 32, and the stretch strips 4 can be transferred to the stretchable bridge 11 of the stretchable substrate, and the plurality of traces can extend along the stretchable bridge 11, thereby forming the structure shown in fig. 3.
In the embodiment of the invention, as shown in fig. 1, the stretchable substrate 1 includes a plurality of island structures 10 and a plurality of stretchable bridges 11, the plurality of island structures 10 are arranged at intervals, the stretchable bridges 11 connect two adjacent island structures 10, a display unit 2 is arranged on the island structures 10, and at least one trace 3 is a signal line connected to the display unit 2, and the details are not repeated herein.
Because under the tensile state of bridge 11 of can stretching, stretch 4 and many walk line 3 simultaneous contact, realized many parallelly connected of walking line 3, consequently, can reduce under the tensile state many total impedances of walking line 3, avoided under the tensile state to walk the line impedance grow influence display quality's of display panel's that can stretch problem. In addition, because the stretching bar 4 is not in contact with the plurality of wires 3 at the same time in the unstretched state of the stretchable bridge 11, that is, the plurality of wires 3 are not in parallel connection at the same time, the total impedance of the plurality of wires 3 before and after stretching can be maintained substantially unchanged, and the display stability of the stretchable display panel is ensured.
An embodiment of the present invention further provides a stretch detection method for a stretchable display panel, which is applied to the stretchable display panel provided in any one of the embodiments, as shown in fig. 15, where fig. 15 is a flowchart of the stretch detection method for the stretchable display panel provided in the embodiment of the present invention, and the detection method includes:
s201: detecting the resistance of at least one wire;
s202: and determining the stretching degree of the stretchable display panel according to the resistance of the at least one wire.
In the embodiment of the invention, the stretching degree of the stretchable display panel can be determined by detecting the resistance of at least one wire, whether the stretchable display panel is over-stretched or not is judged according to the stretching degree of the stretchable display panel, and the judgment result is displayed through the display unit array, so that a user can control the stretching force. Optionally, in the embodiment of the present invention, the resistance of the at least one trace may be detected by a sensor or the like.
Alternatively, as shown in fig. 1, the plurality of island structures 10 are distributed in an array along the first direction X and the second direction Y, detecting the resistance of at least one trace, and determining the stretching degree of the stretchable display panel according to the resistance of at least one trace includes:
detecting the resistance of the at least one trace 3 on the first stretchable bridge 111 to determine the stretching degree of the stretchable display panel in the first direction X according to the resistance of the at least one trace 3 on the first stretchable bridge 111;
the resistance of the at least one trace 3 on the second stretchable bridge 112 is detected to determine the stretching degree of the stretchable display panel in the second direction Y according to the resistance of the at least one trace 3 on the second stretchable bridge 112.
Of course, in other embodiments, the stretchable display panel may also be stretched in other directions, and in embodiments of the present invention, the resistance of the traces on the stretchable bridge in other directions may also be detected, so as to determine the stretching degree of the stretchable display panel in the direction according to the resistance.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (18)
1. A stretchable display panel, comprising:
the stretchable substrate comprises a plurality of island-shaped structures and a plurality of stretchable bridges, the plurality of island-shaped structures are arranged at intervals, and the stretchable bridges connect two adjacent island-shaped structures;
a plurality of display units respectively disposed on the plurality of island-like structures;
the plurality of wires are arranged on the stretchable bridge, extend along the stretchable bridge and are not connected with each other, and at least one wire is a signal wire connected with the display unit;
a stretchable strip disposed on the stretchable bridge, the stretchable strip spanning the plurality of traces, the stretchable display panel including at least a first state and a second state;
in the first state, the stretchable bridge is not stretched, and the stretching strip is not in contact with the plurality of wires simultaneously;
in the second state, the stretchable bridge stretches, and the stretching strip is in contact with the plurality of wires at the same time, so that the plurality of wires are connected in parallel.
2. The stretchable display panel according to claim 1, wherein the plurality of traces include a first trace and a second trace, the first trace is a signal line connecting display units on two adjacent island-shaped structures, and the second trace is arranged in a floating manner in the first state, that is, the second trace is not connected to any circuit structure in the first state.
3. The stretchable display panel according to claim 2, the plurality of traces comprising a plurality of first traces extending along the stretchable bridge and arranged in parallel.
4. A stretchable display panel according to claim 2, wherein a plurality of stretch strips are provided on each of the stretchable bridges;
the second wires on each stretchable bridge comprise a plurality of sub-wires which are arranged at intervals, the sub-wires extend along the extending direction of the stretchable bridge and are sequentially arranged, and each sub-wire is arranged corresponding to one stretching strip.
5. A stretchable display panel according to claim 1, wherein the plurality of island-like structures are distributed in an array along a first direction and a second direction, the first direction and the second direction being perpendicular;
the stretchable bridges comprise a first stretchable bridge connected with two of the island-shaped structures adjacent in the first direction and a second stretchable bridge connected with two of the island-shaped structures adjacent in the second direction;
the stretch strips include a first stretch strip disposed on the first stretchable bridge, the first stretch strip extending in the first direction, or the first stretch strip extending in a direction that intersects the first direction but is not perpendicular, and a second stretch strip disposed on the second stretchable bridge, the second stretch strip extending in the second direction, or the second stretch strip extending in a direction that intersects the second direction but is not perpendicular.
6. The stretchable display panel of claim 5, wherein the display unit comprises a light emitting structure and a driving circuit connected to the light emitting structure;
the first routing on the first stretchable bridge is a gate line connected with the driving circuit;
the first wiring on the second stretchable bridge is a data line connected with the driving circuit.
7. The stretchable display panel of claim 1, wherein the stretch bar comprises a first connection portion, a second connection portion, a first support portion, a second support portion, and a hanging portion;
the first connecting part and the second connecting part are respectively positioned at two sides of the plurality of routing wires, and the first connecting part and the second connecting part are connected with the stretchable bridge;
the first supporting portion connects the first connecting portion and the suspending portion, the second supporting portion connects the second connecting portion and the suspending portion, and the extending direction of the first supporting portion and the second supporting portion intersects with the plane of the stretchable bridge, so that the first supporting portion and the second supporting portion support the suspending portion to span across the plurality of traces and suspend above the plurality of traces in the first state.
8. The stretchable display panel of claim 7, wherein a projection of the suspended portion onto a plane of the stretchable substrate is shaped as a rectangle, an ellipse, or a saddle.
9. The stretchable display panel of claim 8, wherein when the projected shape is an ellipse, the overhang portion comprises a first end and a second end disposed along a major axis of the ellipse, the first end being connected to the first support portion, and the second end being connected to the second support portion.
10. The stretchable display panel of claim 8, wherein when the projected shape is saddle-shaped, the suspended portion comprises a first sub-portion, a second sub-portion, and a third sub-portion disposed along a cross direction, a width of a projection of the second sub-portion perpendicular to the cross direction is smaller than a width of a projection of the first sub-portion perpendicular to the cross direction, and a width of a projection of the second sub-portion perpendicular to the cross direction is smaller than a width of a projection of the third sub-portion perpendicular to the cross direction.
11. The stretchable display panel of claim 1, further comprising a sensor;
the sensor is connected with at least one of the wires and used for detecting the resistance of the wires so as to determine the stretching degree of the stretchable display panel according to the detected resistance value.
12. The stretchable display panel of claim 5, wherein the stretchable display panel comprises a first sensor connected to at least one trace on a first stretchable bridge and a second sensor connected to at least one trace on a second stretchable bridge;
the first sensor is used for detecting the resistance of at least one wire on the first stretchable bridge so as to determine the stretching degree of the stretchable display panel in the first direction according to the detected resistance value;
the second sensor is used for detecting the resistance of at least one wire on the second stretchable bridge, so as to determine the stretching degree of the stretchable display panel in the second direction according to the detected resistance value.
13. The stretchable display panel of claim 1, wherein the stretchable bridge is a serpentine bridge.
14. The stretchable display panel according to claim 5, wherein the first stretchable bridge is a serpentine bridge, the overall orientation of the first stretchable bridge is the first direction, the vibration direction is the second direction, the bending shape of the traces on the first stretchable bridge is the same as the bending shape of the first stretchable bridge, and the bending shape of the traces on the first stretchable bridge varies with the variation of the bending shape of the first stretchable bridge;
the second stretchable bridge is a serpentine bridge, the overall direction of the second stretchable bridge is the second direction, the vibration direction is the first direction, the bending form of the routing wires on the second stretchable bridge is the same as that of the second stretchable bridge, and the bending form of the routing wires on the second stretchable bridge changes along with the change of the bending form of the second stretchable bridge.
15. A flexible display device comprising the stretchable display panel according to any one of claims 1 to 14.
16. A method for manufacturing a stretchable display panel, comprising:
forming a plurality of wires on the first substrate, wherein the wires are not connected with each other;
forming a sacrificial layer on the surfaces of the wires, and forming a stretching strip crossing the wires on the surface of the sacrificial layer;
removing the sacrificial layer, transferring the plurality of routing lines and the stretching strips to stretchable bridges of a stretchable substrate, and enabling the plurality of routing lines to extend along the stretchable bridges, wherein the stretchable substrate comprises a plurality of island-shaped structures and a plurality of stretchable bridges, the plurality of island-shaped structures are arranged at intervals, the stretchable bridges are connected with two adjacent island-shaped structures, display units are arranged on the island-shaped structures, and at least one routing line is a signal line connected with the display units;
wherein the stretchable strip is disposed on the stretchable bridge, the stretchable strip spans the plurality of traces, and the stretchable display panel comprises at least a first state and a second state; in the first state, the stretchable bridge is not stretched, and the stretching strip is not in contact with the plurality of wires simultaneously; in the second state, the stretchable bridge stretches, and the stretching strip is in contact with the plurality of wires at the same time, so that the plurality of wires are connected in parallel.
17. A stretching detection method of a stretchable display panel, applied to the stretchable display panel of any one of claims 1 to 14, comprising:
detecting the resistance of at least one of the wires;
and determining the stretching degree of the stretchable display panel according to the resistance of at least one wire.
18. The detecting method according to claim 17, wherein the detecting the resistance of at least one of the traces, and the determining the stretching degree of the stretchable display panel according to the resistance of at least one of the traces comprises:
detecting the resistance of at least one wire on a first stretchable bridge to determine the stretching degree of the stretchable display panel in a first direction according to the resistance of at least one wire on the first stretchable bridge;
detecting the resistance of at least one wire on a second stretchable bridge to determine the stretching degree of the stretchable display panel in a second direction according to the resistance of at least one wire on the second stretchable bridge.
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| CN111951678B (en) * | 2020-08-11 | 2022-06-17 | 上海天马微电子有限公司 | Display panel and display device |
| CN112289182B (en) * | 2020-10-23 | 2021-11-23 | 武汉华星光电半导体显示技术有限公司 | Stretchable display panel |
| CN112397456B (en) * | 2020-11-13 | 2023-09-26 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN112396961B (en) * | 2020-11-13 | 2022-04-01 | 武汉华星光电半导体显示技术有限公司 | Display panel and display device |
| CN112397457A (en) * | 2020-11-13 | 2021-02-23 | 武汉华星光电半导体显示技术有限公司 | Flexible display module |
| CN112419892B (en) * | 2020-11-16 | 2023-01-17 | 武汉天马微电子有限公司 | Display panel and display device |
| CN112863340A (en) * | 2021-01-12 | 2021-05-28 | 武汉华星光电半导体显示技术有限公司 | Stretchable display module |
| CN113284934B (en) * | 2021-04-30 | 2022-10-04 | 昆山国显光电有限公司 | Stretchable display panel, manufacturing method thereof and display device |
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