CN111999166A - Method and device for testing resilience of flexible display panel after bending - Google Patents
Method and device for testing resilience of flexible display panel after bending Download PDFInfo
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- 238000012360 testing method Methods 0.000 title claims abstract description 126
- 238000000034 method Methods 0.000 title claims abstract description 46
- 238000001514 detection method Methods 0.000 claims abstract description 33
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000010410 layer Substances 0.000 claims description 77
- 230000007704 transition Effects 0.000 claims description 19
- 239000011241 protective layer Substances 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 9
- 238000010998 test method Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 10
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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
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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
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Abstract
The invention discloses a method and a device for measuring resilience after a flexible display panel is bent, wherein the method for measuring resilience after the flexible display panel is bent comprises the following steps: providing a display panel, wherein the display panel comprises a plane part, a bent part and an extending part which are sequentially arranged, and the bent part has resilience; providing a testing device, wherein the testing device comprises a stress detection part; the testing device is placed between the plane portion of the display panel and the extending portion, the first surface of the testing device is connected with the back face of the plane portion, and the second surface of the testing device is connected with the extending portion to test resilience of the bending portion. The display panel bending part structure can quantify the resilience force of the display panel when the bending part is in a bending state, and is convenient for technicians to select a fixing material with proper viscosity, so that the separation risk between the display panel and the supporting layer can be reduced, and the structural reliability of the display panel is improved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method and a device for testing resilience of a flexible display panel after being bent.
Background
In recent years, full-screen displays have become the mainstream design scheme in the display field and are favored by consumers. At present, the flexible characteristic of the flexible display panel is mainly utilized to realize a full-face screen, and the non-display area of the flexible display panel is bent to the back of the main display area, so that the width of a frame of the display panel is reduced, and the screen occupation ratio is improved.
The smaller the bending radius of the flexible display panel is, the smaller the width of the frame is, the higher the screen occupation ratio is, but the smaller the bending radius is, the larger the resilience force of the bending part is, and the higher the separation risk between the display panel and the heightening block is; therefore, how to ensure the reliability of the display panel while reducing the frame size of the display panel is a problem that needs to be studied by those skilled in the art.
Disclosure of Invention
The embodiment of the invention provides a method and a device for testing resilience of a flexible display panel after being bent, aiming at quantifying the resilience of the flexible display panel when the bent part is bent, and facilitating technical personnel to select a fixing material with proper viscosity.
In one aspect, an embodiment of the present invention provides a method for measuring a resilience of a flexible display panel after bending, where the method for measuring a resilience of a flexible display panel after bending includes:
providing a flexible display panel, wherein the flexible display panel comprises a plane part, a bending part and an extending part which are sequentially arranged, the bending part has resilience, and can be in a bending state under the action of external force so as to enable the extending part to be positioned on one side of the back of a display area and reset to enable the plane part, the bending part and the extending part to be positioned on the same plane;
providing a testing device, wherein the testing device is provided with a first surface and a second surface which are opposite to each other in the thickness direction of the testing device, and a stress detection component arranged between the first surface and the second surface, and the stress detection component is used for detecting the tensile stress between the first surface and the second surface;
the testing device is placed between the plane portion of the flexible display panel and the extending portion, the first surface of the testing device is connected with the back face of the plane portion, and the second surface of the testing device is connected with the extending portion to test resilience of the bending portion.
According to an aspect of the embodiment of the present invention, after the step of testing the resilience of the bent portion, the method further includes: selecting the material of the fixing layer according to the test result, wherein the bonding strength P of the material of the fixing layer satisfies the relation 1,
p is not less than F/S formula 1
Wherein F is the measured resilience of the bent portion, and S is the surface area of the support layer in the thickness direction of the support layer.
According to an aspect of the embodiment of the present invention, in the step of testing the resilience of the bent portion, the bent portion is bent in an arc shape, and an included angle between the extending portion and the planar portion is smaller than 10 °.
According to an aspect of the embodiment of the invention, in the step of testing the resilience of the bending portion, a position where the bending portion is connected to the display area is an initial bending position of the flexible display panel, a position where the bending portion is connected to the extending portion is a terminal bending position of the flexible display panel, and a distance l between a first end of the testing device near the bending portion and the initial bending position of the flexible display panel1And the distance l between the first end of the testing device close to the bending part and the bending tail end of the flexible display panel2Are not more than 0.15 mm.
According to an aspect of the embodiment of the present invention, placing the testing device between the display area and the extension portion of the flexible display panel, and connecting the first surface of the testing device with the back surface of the planar portion, and connecting the second surface with the extension portion includes:
placing a testing device on one side of the back of the plane part, and connecting a first surface of the testing device with the back of the plane part;
and performing arc bending on the bending part to enable the extending part to be positioned on one side of the back surface of the plane part and to enable the extending part to be connected with the second surface of the testing device.
According to an aspect of the embodiments of the present invention, in the step of providing the flexible display panel, the flexible display panel further includes a first support layer disposed on a back surface of the planar portion and a second support layer disposed on a side surface of the extending portion facing the planar portion;
in the step of testing the resilience force of the bent part, the first surface of the testing device is connected with the first supporting layer, and the second surface of the testing device is connected with the second supporting layer.
In the step of providing a test device according to an aspect of an embodiment of the present invention, the thickness D of the test device satisfies relation 2,
R＝D+d1+d2formula 2
Wherein R is the bending radius of the bending part, d1Is the thickness of the first support layer, d2Is the thickness of the second support layer.
According to an aspect of the embodiments of the present invention, in the step of providing the flexible display panel, the flexible display panel further includes a bending transition region, the bending transition region connects the planar portion and the bending portion, and the first support layer supports the planar portion and the bending transition region;
in the step of testing the resilience force of the bending part, the bending transition area is coplanar with the plane part, and the position where the bending part is connected with the bending transition area is the bending initial position of the flexible display panel.
According to an aspect of the embodiment of the present invention, in the step of providing the flexible display panel, the flexible display panel further includes a protective layer, the protective layer is disposed on one side of the front surface of the flexible display panel, and the protective layer completely covers the bending portion;
and in the step of testing the resilience force of the bent part, the protective layer and the bent part are bent synchronously.
On the other hand, an embodiment of the present invention provides a testing apparatus for a method for testing resilience of a flexible display panel after being bent, where the testing apparatus includes:
the stress detection component is provided with a first end face and a second end face which are opposite to each other in the thickness direction of the stress detection component;
the first end face of the stress detection part is connected with the back face of the plane part of the flexible display panel through the fixing device, and the second end of the stress detection part is connected with the extension part through the fixing device;
preferably, the testing device comprises a plurality of stress detection parts which are distributed at equal intervals;
preferably, the fixing device is a vacuum absorber or an adhesive layer;
preferably, the stress detection means comprises a resistive strain gauge.
In the method for measuring resilience after bending the flexible display panel provided by the embodiment of the invention, the flexible display panel comprises a plane part, an extending part and a bending part with resilience, the testing device comprises a stress detection part, the testing device is arranged between the plane part and the extending part of the flexible display panel, the first surface of the testing device is connected with the back surface of the plane part, the second surface is connected with the extending part, and the bending part has resilience, so that when the bending part is in a bending state, the plane part and the extending part have a trend of being away from each other, tensile stress is generated between the first surface and the second surface of the testing device and is detected by the stress detection part, so that the resilience of the bending part can be measured by the testing device, technicians can better select a fixing material between the flexible display panel and a supporting layer, and further can reduce the separation risk between the flexible display panel and the supporting layer, the structural reliability of the display panel is improved.
The testing device provided by the embodiment of the invention comprises the stress detection part and the fixing device, and can be used in a method for testing the resilience of the flexible display panel after the flexible display panel is bent.
Drawings
Other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments thereof, when read in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof, and which are not to scale.
Fig. 1 is a flowchart illustrating a method for measuring a resilience of a flexible display panel after bending according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a flexible display panel in a planar state in a method for measuring resilience of the flexible display panel after bending according to an embodiment of the present invention;
fig. 3 is a partial cross-sectional view of a flexible display panel in a bending state in a method for measuring resilience of the flexible display panel after bending according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating a method for measuring resilience after a flexible display panel is bent according to an embodiment of the present invention;
fig. 5 is a partial cross-sectional view of a flexible display panel in a bent state in a method for measuring resilience of the flexible display panel after bending according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a testing apparatus according to an embodiment of the present invention.
Description of reference numerals:
10-a flexible display panel;
11-a display area; 111-plane section;
12-a non-display area; 121-a bending part; 122-an extension; 123-bending transition zone;
13-a first support layer; 14-a second support layer;
15-a protective layer;
20-a test device; 21-a stress detection component; 22-fixing means.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below, and in order to make objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It will be apparent to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
It will be understood that when a layer, region or layer is referred to as being "on" or "over" another layer, region or layer in describing the structure of the component, it can be directly on the other layer, region or layer or intervening layers or regions may also be present. Also, if the component is turned over, one layer or region may be "under" or "beneath" another layer or region.
In recent years, full-screen displays have become the mainstream design scheme in the display field and are favored by consumers. At present, the flexible characteristic of the flexible display panel is mainly utilized to realize a full-face screen, and the non-display area of the flexible display panel is bent to the back of the main display area, so that the width of a frame of the display panel is reduced, and the screen occupation ratio is improved.
The bending radius of the flexible screen body is smaller, the width of the frame is smaller, the screen occupation ratio is higher, and meanwhile, the resilience force of the bending part is larger, so that the reduction of the bending radius increases the separation risk between the flexible display panel and the supporting layers such as the heightening block. Based on the above problems, embodiments of the present invention provide a method and a device for measuring resilience of a flexible display panel after bending, which can measure the resilience of the flexible display panel when the bending portion is in a bending state, so that a technician can better select a fixing material between the display panel and the supporting layer, thereby reducing a separation risk between the display panel and the supporting layer and improving structural reliability of the display panel.
Referring to fig. 1 to 3, fig. 1 is a flowchart illustrating a method for measuring a resilience of a flexible display panel after bending according to an embodiment of the present invention; fig. 2 is a schematic structural diagram of a display panel in a planar state in a method for measuring resilience of a flexible display panel after bending according to an embodiment of the present invention; fig. 3 is a partial cross-sectional view of a display panel in a bending state in a method for measuring resilience of a flexible display panel after bending according to an embodiment of the present invention.
The method for measuring the resilience of the flexible display panel after being bent, provided by the embodiment of the invention, comprises the following steps:
step S100, providing a display panel 10; the display panel 10 includes a planar portion 111, a bent portion 121, and an extending portion 122, which are sequentially disposed, the bent portion 121 has resilience, the bent portion 121 can be bent under an external force, the extending portion 122 is located on the back side of the planar portion 11, and meanwhile, the bent portion 121 can be reset to a planar state, and the planar portion 111, the bent portion 121, and the extending portion 122 are located on the same plane.
Alternatively, the display panel 10 may be a flexible display panel, and the display panel 10 may be an Organic Light Emitting Diode (OLED) display panel 10.
It is understood that the display panel 10 generally has a display area 11 and a non-display area 12, and the display area 11 has a light emitting surface and a back surface opposite to each other. The non-display region 12 of the display panel 10 is generally provided with an integrated circuit for realizing functions of signal transmission, driving image display, and the like.
Alternatively, the planar portion 111 may be a display area 11 having a display function, the bending portion 121 and the extending portion 122 may be a non-display area 12, and the back surface of the planar portion 111 is a side of the planar portion 111 departing from the light-emitting surface thereof.
Alternatively, the bending portion 121 and the extending portion 122 may also be a display region, and the flexible display panel is a display panel that can be bent and folded from the display region.
Step S200, providing the testing device 20; the testing device 20 has a first surface and a second surface opposite to each other in the thickness direction of the testing device, and a stress detection member 21 disposed between the first surface and the second surface, wherein the stress detection member 21 is used for detecting a tensile stress between the first surface and the second surface of the testing device 20.
It should be noted that, the steps of providing the display panel 10 and providing the testing device 20 are not in sequence.
Step S300, placing the testing device 20 between the planar portion 111 and the extending portion 122 of the display panel 10, and connecting a first surface of the testing device 20 with the back surface of the planar portion 111, and connecting a second surface of the testing device 20 with the extending portion 122, so as to test the resilience of the bending portion 121.
It can be understood that the testing device 20 is placed between the planar portion 111 and the extending portion 122 of the display panel 10, and when the first surface of the testing device 20 is connected to the back surface of the planar portion 111 and the second surface is connected to the extending portion 122, the bending portion 121 is bent and the extending portion 122 is located on the back surface side of the planar portion 111.
Since the bent portion 121 has resilience, when the bent portion 121 is in a bent state, the flat portion 111 and the extended portion 122 tend to be away from each other, so that a tensile stress is generated between the first surface and the second surface of the testing device 20 and is detected by the stress detecting member 21.
It can be understood that the tensile stress generated between the first surface and the second surface of the testing device 20 is equivalent to the separation force between the display panel 10 and the supporting layer, the resilience of the bending portion 121 is different, and the separation force between the display panel 10 and the supporting layer is different, so that the resilience of the bending portion 121 can be measured by the testing device 20.
It should be noted that, in order to ensure the accuracy of the measurement result, during the process of testing the resilience of the bending portion 121, neither the first surface nor the second surface of the testing device 20 can be separated from the connection position.
In some optional embodiments, the method for measuring resilience after bending of the flexible display panel provided in the embodiments of the present invention, after step S300, may further include:
selecting the material of the fixing layer according to the test result, wherein the bonding strength P of the material of the fixing layer satisfies the relation 1,
p is not less than F/S formula 1
Where F is the measured return force of the bent portion 121, and S is the area of the surface of the support layer in the thickness direction thereof.
The supporting layer may be an elevation block, and may also include an elevation block and a composite tape layer. The fixing layer may be an adhesive layer between the display panel 10 and the support layer, or may be a part of the support layer.
Due to the adhesive force F between the display panel 10 and the supporting layer in practical applications1As shown in formula 1, F ═ PS1F or more, i.e. the adhesive force F between the display panel 10 and the supporting layer1The elastic force of the bending part 121 is not less than, so that the risk of separation between the display panel 10 and the supporting layer can be reduced, and the structural reliability of the display panel 10 is improved.
In order to accurately measure the resilience of the bent portion 121 in practical application, in the method for measuring the resilience of the flexible display panel after being bent according to the embodiment of the present invention, the shape of the bent portion 121 in practical application may be simulated. In some alternative embodiments, in step S300, the bent portion 121 may be bent in an arc, and the range of the central angle θ corresponding to the bent portion 121 after being bent may be 175 ° to 185 °, so that the included angle between the extending portion 122 and the plane portion 111 is smaller than 10 °.
Alternatively, the thickness D of the testing device 20 is consistent with the bending diameter of the bending portion 121, and the central angle θ corresponding to the bending portion 121 after bending may be 180 °, so that the extending portion 122 can be parallel to the planar portion 111 after bending the arc of the bending portion 121, and the connecting portion between the bending portion 121 and the extending portion 122 and the planar portion 111 has no dead-fold point.
It can be understood that, the bending radius R of the bent portion 121 is different, and the resilience of the bent portion 121 is different; during testing, the bending radius R of the bending portion 121 may be selected according to actual use requirements. Of course, the resilience of the bending portion 121 when bent at different radii can be tested and recorded, and in actual use, the resilience of the bending portion 121 is checked according to the bending radius R and the material of the fixing layer is selected.
It is understood that, in step S300, the position of the testing device 20 may be consistent with the position of the original supporting layer of the display panel 10, so as to simulate the shape of the bending portion 121 in practical application, and further accurately measure the resilience of the bending portion 121 in practical application.
As an alternative embodiment, in step S300, the initial bending position of the display panel 10 may be a position where the bending portion 121 and the plane portion 111 are connected, the end bending position of the display panel 10 may be a position where the bending portion 121 and the extending portion 122 are connected, and the distance l between the first end of the testing device 20 close to the bending portion 121 and the initial bending position of the display panel 101And a distance l between a first end of the testing device 20 close to the bending part 121 and a bending end position of the display panel 102Are not more than 0.15 mm. Optionally, the first end of the testing device 20 close to the bending portion 121 is aligned with both the bending initial position of the display panel 10 and the bending end position of the display panel 10, i.e. /)1And l2May all be zero.
Of course, the placing position of the testing device 20 is not limited thereto, and in step S300, the testing device 20 may be placed at different positions as needed, and the separation force between the display panel 10 and the supporting layer at different positions may be measured, which is also within the protection scope of the present application.
Referring to fig. 4, fig. 4 is a flowchart illustrating a method for measuring resilience of a flexible display panel after bending according to an embodiment of the present invention.
It is understood that the display panel 10 may have a first configuration and a second configuration, when the display panel 10 is in the first configuration, the bending portion 121 is in a planar state, the planar portion 111, the bending portion 121 and the extending portion 122 are located on the same plane, when the display panel 10 is in the second configuration, the bending portion 121 is in a bent state, and the extending portion 122 is located on the back side of the planar portion 111.
In some optional embodiments, step S300 may specifically include:
step S310, placing the test device 20 on the back side of the planar portion 111 when the display panel 10 is in the first configuration, and connecting the first surface of the test device 20 with the back side of the planar portion 111;
in step S320, the bending portion 121 is bent in an arc shape, so that the extending portion 122 is located on the back side of the planar portion 111, and the extending portion 122 is connected to the second surface of the testing device 20.
The testing device 20 is placed on one side of the back of the plane portion 111, and then the bending portion 121 is bent, so that the operation is simple and convenient, and the testing device 20 is conveniently connected with the plane portion 111 and the extending portion 122.
As an alternative embodiment, it is also within the scope of the present application that the bending portion 121 is bent to make the display panel 10 in the second configuration, and then the testing device 20 is placed between the planar portion 111 and the extending portion 122, and the first surface of the testing device 20 is connected to the back surface of the planar portion 111, and the second surface is connected to the extending portion 122.
In some alternative embodiments, in order to accurately measure the resilience of the bent portion 121 in practical applications, in the step of bending the bent portion 121 in an arc, positioning the extending portion 122 at the back side of the planar portion 111, and connecting the extending portion 122 to the second surface of the testing device 20, the extending portion 122 may be connected to the second surface of the testing device 20 while keeping the bending radius R of the bent portion 121 consistent with the thickness D of the testing device 20.
Referring to fig. 5, fig. 5 is a partial cross-sectional view of a display panel in a bending state in a method for measuring resilience of a flexible display panel after bending according to another embodiment of the present invention.
In some optional embodiments, in step S100, the display panel 10 may further include a first support layer 13 and a second support layer 14, where the first support layer 13 is disposed on the back surface of the planar portion 111, and the second support layer 14 is disposed on a side surface of the extending portion 122 facing the planar portion 111, so as to simulate a structure of the display panel 10 in practical applications. Alternatively, the first support layer 13 and the second support layer 14 may be a material having both hardness and elasticity to support and protect the flexible display panel.
Alternatively, in step S300, a first surface of the testing device 20 may be connected to the first support layer 13, and a second surface may be connected to the second support layer 14.
On the basis of the above embodiment, as an alternative embodiment, in step S200, the thickness D of the testing device 20 may satisfy the relation 2, so as to accurately measure the resilience of the bent portion 121 in practical application,
R＝D+d1+d2formula 2
Wherein R is the bending radius of the bending part 121, d1Thickness of the first support layer 13, d2Is the thickness of the second support layer 14.
Optionally, the thickness d of the first support layer 131Thickness d of the second support layer 142May be the same or different.
It can be understood that, the bending radius R of the bent portion 121 is different, the resilience of the bent portion 121 is different, and when the resilience of the bent portion 121 when being bent in an arc with a preset radius needs to be measured, a measuring device with a corresponding thickness is selected.
In some optional embodiments, in the method for measuring resilience after bending of the flexible display panel provided in the embodiments of the present invention, in step S100, the non-display area 12 of the display panel 10 may further include a bending transition area 123, the bending transition area 123 connects the planar portion 111 and the bending portion 121, and the first support layer 13 may support the planar portion 111 and the bending transition area 123; in step S300, the bending transition area 123 is coplanar with the planar portion 111, and the bending initial position of the display panel 10 may be a position where the bending portion 121 and the bending transition area 123 are connected, so that both sides of the bending initial position of the display panel 10 are non-display areas, which can alleviate a phenomenon of stress concentration caused by different structures of the two side areas of the bending initial position, and can also reduce stress acting on the planar portion 111 when the bending portion 121 is bent.
In some optional embodiments, in step S100, the display panel 10 may further include a protection layer 15, the protection layer 15 is disposed on the front side of the display panel 10, and the protection layer 15 completely covers the bending portion 121; in step S300, the protection layer 15 may be bent in synchronization with the bent portion 121 to protect the bent portion 121.
As an alternative embodiment, the protective layer 15 may at least partially cover the bending transition area 123. Alternatively, the protection layer 15 may completely cover the bending transition region 123, which can better relieve the bending stress at the initial bending position of the display panel 10.
As an alternative embodiment, the protective layer 15 may at least partially cover the extension 122. Optionally, the protection layer 15 may completely cover the extension portion 122 of the bending transition area 123, which can relieve the bending stress at the bending end position of the display panel 10.
According to the method for measuring the resilience after the flexible display panel is bent, provided by the embodiment of the invention, the resilience when the bent part 121 is bent at the preset radius can be accurately measured, so that a technician can better select a fixing material between the display panel 10 and the supporting layer, the separation risk between the display panel 10 and the supporting layer can be further reduced, and the structural reliability of the display panel 10 can be improved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a testing apparatus 20 according to an embodiment of the present invention.
In addition, the embodiment of the present invention further provides a testing apparatus 20, which can be used in the method for testing the resilience as described above. The test apparatus 20 includes:
a stress detection member 21 having a first end face and a second end face which are opposite to each other in a thickness direction thereof;
the fixing device 22 connects the first end of the stress detection member 21 to the back surface of the planar portion 111 of the display panel 10 via the fixing device 22, and connects the second end of the stress detection member 21 to the extension portion 122 via the fixing device 22.
During testing, the testing device 20 is placed between the planar portion 111 and the extending portion 122 of the display panel 10, and the first end of the stress detection component 21 is connected to the back of the planar portion 111 through the fixing device 22, and the second end of the stress detection component 21 is connected to the extending portion 122 through the fixing device 22, so as to test the resilience of the bending portion 121.
As an alternative embodiment, the testing device 20 includes a plurality of stress detection members 21, and the plurality of stress detection members 21 may be distributed at equal intervals. Alternatively, the plurality of stress detection members 21 may be distributed in a rectangular array.
In some optional embodiments, the stress detection component 21 may be a tension sensor or a resistance strain gauge, and the resilience force is measured by a resistance change caused by a small deformation, so that the measurement accuracy is high.
In alternative embodiments, the fixture 22 may be vacuum suction or an adhesive layer.
Alternatively, when the fixing device 22 is an adhesive layer, the stress detection component 21 may be embedded in the adhesive layer.
In order to accurately measure the resilience of the bending portion 121, the adhesive layer needs to be made of a highly adhesive material, so as to ensure that the adhesive layer does not separate from the display panel 10 during the process of testing the resilience of the bending portion 121. Optionally, the adhesive layer may be made of epoxy resin adhesive, polyurethane adhesive, or the like.
As an optional embodiment, the length, the width, the thickness, and other dimensions of the testing device 20 may be completely consistent with the original dimensions of the supporting layer of the display panel 10, and the placing position of the testing device 20 may be consistent with the placing position of the supporting layer during testing, so as to simulate the form of the bending portion 121 in practical application, and further accurately measure the resilience of the bending portion 121 in practical application.
It can be understood that, the bending radius R of the bent portion 121 is different, the resilience of the bent portion 121 is different, and when the resilience of the bent portion 121 at the predetermined bending radius needs to be measured, a measuring device with a corresponding thickness is selected.
In accordance with the above-described embodiments of the present invention, these embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. The invention is limited only by the claims and their full scope and equivalents.
Claims (10)
1. A method for measuring resilience of a flexible display panel after bending is characterized by comprising the following steps:
providing a flexible display panel, wherein the flexible display panel comprises a plane part, a bending part and an extending part which are sequentially arranged;
providing a testing device, wherein the testing device is provided with a first surface and a second surface which are opposite in the thickness direction of the testing device, and a stress detection component arranged between the first surface and the second surface, and the stress detection component is used for detecting the tensile stress between the first surface and the second surface;
and placing the testing device between the plane part and the extension part of the flexible display panel, so that the first surface of the testing device is connected with the back of the plane part, and the second surface of the testing device is connected with the extension part to test the resilience force of the bending part.
2. The method for testing the resilience of the flexible display panel after being bent according to claim 1, further comprising, after the step of testing the resilience of the bent portion:
selecting a material of the fixing layer according to the test result, wherein the bonding strength P of the material of the fixing layer satisfies the relation 1,
p is not less than F/S formula 1
Wherein F is the measured resilience of the bent part, and S is the surface area of the support layer in the thickness direction of the support layer.
3. The method according to claim 1, wherein in the step of testing the resilience of the bent portion, the bent portion is bent in an arc shape, and an included angle between the extending portion and the planar portion is smaller than 10 °.
4. The method according to claim 3, wherein in the step of testing the resilience of the bending portion, the position where the bending portion and the planar portion are connected is an initial bending position of the display panel, and the bending portion and the planar portion are connectedThe position where the extension parts are connected is the bending tail end position of the display panel, and the distance l between the first end of the testing device close to the bending part and the bending initial position1And the distance l between the first end of the testing device close to the bending part and the tail end of the bending part2Are not more than 0.15 mm.
5. The method of claim 1, wherein the placing the testing device between the planar portion and the extension portion of the flexible display panel with the first surface of the testing device connected to a back surface of the planar portion and the second surface connected to the extension portion comprises:
placing the testing device on one side of the back of the planar portion so that the first surface of the testing device is connected with the back of the planar portion;
and performing arc bending on the bent part to enable the extension part to be positioned on one side of the back of the plane part and to enable the extension part to be connected with the second surface of the testing device.
6. The method according to any of claims 3 to 5, wherein in the step of providing the flexible display panel, the flexible display panel further comprises a first support layer disposed on a back surface of the planar portion and a second support layer disposed on a side surface of the extension portion facing the planar portion;
in the step of testing the resilience force of the bent part, the first surface of the testing device is connected with the first supporting layer, and the second surface of the testing device is connected with the second supporting layer.
7. The method for measuring resilience of a flexible display panel after being bent according to claim 6, wherein in the step of providing the testing device, the thickness D of the testing device satisfies relation 2,
R＝D+d1+d2formula 2
Wherein R is the bending radius of the bending part, d1Is the thickness of the first support layer, d2Is the thickness of the second support layer.
8. The method according to claim 6, wherein in the step of providing the flexible display panel, the flexible display panel further comprises a bending transition region, the bending transition region connects the planar portion and the bending portion, and the first supporting layer supports the planar portion and the bending transition region;
and in the step of testing the resilience force of the bending part, the bending transition area is coplanar with the plane part, and the position where the bending part is connected with the bending transition area is the bending initial position of the flexible display panel.
9. The method according to claim 6, wherein in the step of providing the flexible display panel, the flexible display panel further comprises a protective layer disposed on one side of the front surface of the display panel, and the protective layer completely covers the bending portion;
and in the step of testing the resilience force of the bent part, the protective layer and the bent part are bent synchronously.
10. A testing apparatus for a method of testing resilience of a flexible display panel according to any one of claims 1 to 9 after being bent, the testing apparatus comprising:
the stress detection component is provided with a first end face and a second end face which are opposite to each other in the thickness direction of the stress detection component;
a fixing device, through which the first end surface of the stress detection member is connected to the back surface of the planar portion of the display panel, and through which the second end of the stress detection member is connected to the extension portion;
preferably, the testing device comprises a plurality of stress detection parts which are distributed at equal intervals;
preferably, the fixing device is a vacuum adsorber or an adhesive layer;
preferably, the stress detection means comprises a resistance strain gauge.
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