CN111999166B - Method for measuring resilience of flexible display panel after bending and testing device - Google Patents
Method for measuring resilience of flexible display panel after bending and testing device Download PDFInfo
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- CN111999166B CN111999166B CN202010969770.2A CN202010969770A CN111999166B CN 111999166 B CN111999166 B CN 111999166B CN 202010969770 A CN202010969770 A CN 202010969770A CN 111999166 B CN111999166 B CN 111999166B
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- 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
- G01N3/02—Details
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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Abstract
本发明公开了一种柔性显示面板弯折后测回弹力的方法以及测试装置，柔性显示面板弯折后测回弹力的方法包括：提供显示面板，显示面板包括依次设置的平面部、弯折部和延伸部，弯折部具有回弹性；提供测试装置，测试装置包括应力检测部件；将测试装置放置在显示面板的平面部与延伸部之间，使测试装置的第一表面与平面部的背面连接，第二表面与延伸部连接，以测试弯折部的回弹力。本发明能够量化显示面板弯折部呈弯折状态时的回弹力，方便技术人员选择合适粘性的固定材料，进而能够降低显示面板与支撑层之间的分离风险，提高显示面板的结构可靠性。
The invention discloses a method and a testing device for measuring the resilience of a flexible display panel after bending. The method for measuring the resilience of a flexible display panel after bending includes: providing a display panel, which includes a flat portion and a bending portion arranged in sequence. and an extension part, the bending part has resilience; a test device is provided, and the test device includes a stress detection component; the test device is placed between the flat part and the extension part of the display panel, so that the first surface of the test device and the back of the flat part Connect, the second surface is connected to the extension part to test the resilience of the bending part. The present invention can quantify the resilience of the bent portion of the display panel when it is in a bent state, making it easier for technicians to select a fixing material with appropriate viscosity, thereby reducing the risk of separation between the display panel and the support layer and improving the structural reliability of the display panel.
Description
Technical Field
The invention relates to the technical field of display, in particular to a method for measuring resilience after bending a flexible display panel and a testing device.
Background
In recent years, the full screen has become a mainstream design scheme in the display field and is favored by a wide range of consumers. At present, the flexible characteristic of the flexible display panel is mainly utilized to realize a full screen, and the non-display area of the flexible display panel is bent to the back of the main display area, so that the frame width 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 frame width 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 reduce the frame of the display panel and simultaneously ensure the reliability of the display panel is a problem that the skilled person needs to study.
Disclosure of Invention
The embodiment of the invention provides a method and a testing device for measuring resilience force after bending a flexible display panel, which aim to quantify the resilience force of the bending part of the flexible display panel in a bending state so as to facilitate a technician to select a fixing material with proper viscosity.
In one aspect, an embodiment of the present invention provides a method for measuring resilience after bending a flexible display panel, where the method for measuring resilience after bending the flexible display panel 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 rebound resilience, can be in a bending state under the action of external force, so that the extending part is positioned at one side of the back surface of a display area, and can be 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 part and the extension part of the flexible display panel, the first surface of the testing device is connected with the back surface of the plane part, and the second surface of the testing device is connected with the extension part, so that the resilience force of the bending part is tested.
According to an aspect of the embodiment of the present invention, after the step of testing the resilience of the bending 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 meets the relation 1,
p is greater than or equal to F/S type 1
Wherein F is the measured resilience of the bending part, and S is the area of the surface of the supporting layer in the thickness direction of the supporting layer.
According to an aspect of the embodiment of the present invention, in the step of testing the resilience of the bending portion, the bending portion is curved and the angle between the extension portion and the planar portion is made to be smaller than 10 °.
According to one aspect of the embodiment of the present invention, in the step of testing the resilience of the bending portion, the position where the bending portion and the display area are connected is the bending initial position, the bending portion and the extension of the flexible display panelThe joint position of the part is the bending end position of the flexible display panel, and the distance l between the first end of the testing device close to the bending part and the bending initial position of the flexible display panel 1 And a distance l between a first end of the testing device, which is close to the bending part, and a bending end position of the flexible display panel 2 No greater than 0.15mm.
According to an aspect of an embodiment of the present invention, placing the testing device between the display area of the flexible display panel and the extension such that the first surface of the testing device is connected to the back surface of the planar portion and the second surface is connected to the extension comprises:
placing the testing device on one side of the back surface of the plane part, and connecting the first surface of the testing device with the back surface of the plane part;
and (3) carrying out arc bending on the bending part, so that the extending part is positioned at one side of the back surface of the plane part, and the extending part is connected with the second surface of the testing device.
According to an aspect of an embodiment 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 rear 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 bending 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.
According to an aspect of an embodiment of the present invention, in the step of providing the test device, the thickness D of the test device satisfies the relation 2,
2R＝D+d 1 +d 2 2, 2
Wherein R is the bending radius of the bending part, d 1 D is the thickness of the first supporting layer 2 Is the thickness of the second support layer.
According to an aspect of an embodiment of the present invention, in the step of providing the flexible display panel, the flexible display panel further includes a bending transition region connecting the plane portion and the bending portion, the first support layer supporting the plane 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 joint position of the bending part and 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 disposed on a front side of the flexible display panel, the protective layer completely covering the bending portion;
in the step of testing the resilience of the bending part, the protection layer and the bending part are synchronously bent.
In another aspect, an embodiment of the present invention provides a testing device for a method for measuring resilience of a flexible display panel after bending, where the testing device includes:
a stress detection member having a first end face and a second end face which are opposite to each other in a thickness direction thereof;
and the first end face of the stress detection component 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 component is connected with the extension part through the fixing device.
According to the foregoing embodiment of another aspect of the present invention, the testing device includes a plurality of stress detecting members, the plurality of stress detecting members being equally spaced apart.
According to the previous embodiment of another aspect of the present invention, the fixing device is a vacuum absorber or an adhesive layer.
According to the foregoing embodiment of another aspect of the present invention, the stress detecting member includes a resistance strain gauge.
In the method for measuring the resilience force of the flexible display panel after bending, the flexible display panel comprises the plane part, the extension part and the bending part with resilience which are sequentially arranged, the testing device comprises the stress detection part, the testing device is placed between the plane part and the extension 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 of the testing device is connected with the extension part, and the bending part has resilience, so that when the bending part is in a bending state, the plane part and the extension part have a mutual far-away trend, the tensile stress is generated between the first surface and the second surface of the testing device and is detected by the stress detection part, therefore, the resilience force of the bending part can be measured through the testing device, a technician can better select a fixing material between the flexible display panel and the support layer, the separation risk between the flexible display panel and the support layer can be reduced, and the structural reliability of the display panel is improved.
The testing device provided by the embodiment of the invention comprises the stress detection component and the fixing device, and can be used in a method for detecting the resilience force of the flexible display panel after bending.
Drawings
Other features, objects and advantages of the present invention will become more apparent upon reading the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar features, and in which the figures are not to scale.
Fig. 1 is a flowchart illustrating a method for measuring resilience after bending a flexible display panel 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 after bending the flexible display panel according to an embodiment of the present invention;
fig. 3 is a partial cross-sectional view of a flexible display panel in a bent state in a method for measuring a resilience force after bending the flexible display panel according to an embodiment of the present invention;
FIG. 4 is a flowchart illustrating a method for detecting resilience after bending a flexible display panel 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 a resilience after bending the flexible display panel according to another embodiment of the present invention;
fig. 6 shows a schematic structural diagram of a test device according to an embodiment of the present invention.
Reference numerals illustrate:
10-a flexible display panel;
11-a display area; 111-plane part;
12-a non-display area; 121-a bending part; 122-extension; 123-kink transition zone;
13-a first support layer; 14-a second support layer;
15-a protective layer;
20-a testing 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 the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and the detailed embodiments. It should be understood that the specific embodiments described herein are merely configured to illustrate the invention and are not configured to limit 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 invention by showing examples of the invention.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 like elements in a process, method, article or apparatus that comprises the element.
It will be understood that when a layer, an area, or a structure is described as being "on" or "over" another layer, another area, it can be referred to as being directly on the other layer, another area, or another layer or area can be included between the layer and the other layer, another area. And if the component is turned over, that layer, one region, will be "under" or "beneath" the other layer, another region.
In recent years, the full screen has become a mainstream design scheme in the display field and is favored by a wide range of consumers. At present, the flexible characteristic of the flexible display panel is mainly utilized to realize a full screen, and the non-display area of the flexible display panel is bent to the back of the main display area, so that the frame width of the display panel is reduced, and the screen occupation ratio is improved.
The smaller the bending radius of the flexible screen body is, the smaller the frame width is, the higher the screen occupation ratio is, and meanwhile, the larger the resilience force of the bending part is, so that the separation risk between the flexible display panel and the supporting layer such as the heightening block is increased due to the reduction of the bending radius. Based on the above problems, the embodiment of the invention provides a method and a testing device for measuring resilience force after bending a flexible display panel, which can measure resilience force when a bending part is in a bending state, so that a technician can better select a fixing material between the display panel and a supporting layer, further reduce separation risk between the display panel and the supporting layer, and improve structural reliability of the display panel.
Referring to fig. 1 to 3 together, fig. 1 is a flowchart illustrating a method for measuring resilience after bending a flexible display panel according to an embodiment of the invention; fig. 2 is a schematic structural diagram of a display panel in a planar state in a method for measuring resilience after bending the flexible display panel according to an embodiment of the present invention; fig. 3 is a partial cross-sectional view of a display panel in a bent state in a method for measuring a resilience force after bending the flexible display panel according to an embodiment of the present invention.
The method for measuring the resilience of the flexible display panel after bending 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 bending portion 121, and an extension portion 122 that are sequentially disposed, the bending portion 121 has resilience, the bending portion 121 can be in a bent state under an external force, and the extension portion 122 is located at a rear side of the planar portion 11, and at the same time, the bending portion 121 can be reset to a planar state and the planar portion 111, the bending portion 121, and the extension 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 Organic Light Emitting Diode, OLED) display panel 10.
It will be appreciated that the display panel 10 generally has a display region 11 and a non-display region 12, with the display region 11 having opposite light-exiting and back surfaces. The non-display area 12 of the display panel 10 is typically provided with integrated circuits for implementing functions of signal transmission, driving image display, and the like.
Alternatively, the planar portion 111 may be the display area 11 with a display function, and the bent portion 121 and the extension portion 122 may be the non-display area 12, so that the back surface of the planar portion 111 is a side of the planar portion 111 facing away from the light emitting surface thereof.
Alternatively, the bending part 121 and the extending part 122 may be display areas, and the flexible display panel may be a display panel that may be bent and folded from the display areas.
Step S200, providing a testing device 20; the testing device 20 has a first surface and a second surface opposite to each other in the thickness direction thereof, and a stress detecting member 21 disposed between the first surface and the second surface, the stress detecting member 21 being configured to detect 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 sequential.
In step S300, the testing device 20 is placed between the flat portion 111 and the extension portion 122 of the display panel 10, and the first surface of the testing device 20 is connected to the back surface of the flat portion 111, and the second surface of the testing device 20 is connected to the extension portion 122 to test the resilience of the bending portion 121.
It can be understood that the testing device 20 is disposed between the flat portion 111 and the extension portion 122 of the display panel 10, and the first surface of the testing device 20 is connected to the back surface of the flat portion 111, and when the second surface is connected to the extension portion 122, the bending portion 121 is in a bending state and the extension portion 122 is located on the back surface side of the flat portion 111.
Since the bending portion 121 has resilience, when the bending portion 121 is in a bending state, the plane portion 111 and the extension portion 122 have a tendency 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 the tensile stress is detected by the stress detecting component 21.
It can be understood that the tensile stress generated between the first surface and the second surface of the testing device 20 corresponds to the separation force between the display panel 10 and the supporting layer, and the resilience of the bending portion 121 is different, so that the separation force between the display panel 10 and the supporting layer is different, and the resilience of the bending portion 121 can be measured by the testing device 20.
It should be noted that, in order to ensure accuracy of the measurement result, in the process of testing the resilience of the bending portion 121, the first surface and the second surface of the testing device 20 cannot be separated from the connection position.
In some optional embodiments, the method for measuring resilience of the flexible display panel after bending according to the embodiment of the present invention may further include, after step S300:
selecting the material of the fixing layer according to the test result, wherein the bonding strength P of the material of the fixing layer meets the relation 1,
p is greater than or equal to F/S type 1
Where F is the measured resilience of the bent portion 121, and S is the area of the surface of the support layer in the thickness direction thereof.
It should be noted that the supporting layer may be a raised block, or may include a raised block and a composite adhesive 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 application 1 As can be seen from equation 1, f=ps 1 Not less than F, i.e. the adhesion force F between the display panel 10 and the supporting layer 1 Not less than the resilience of the bending part 121, 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 can be improved.
In order to accurately measure the resilience of the bending portion 121 in practical application, in the method for measuring resilience of the flexible display panel after bending provided in the embodiment of the invention, the shape of the bending portion 121 in practical application can be simulated. In some alternative embodiments, in step S300, the bending portion 121 may be curved, and the central angle θ corresponding to the curved portion 121 may range from 175 ° to 185 °, so that the angle between the extension portion 122 and the planar portion 111 is smaller than 10 °.
Optionally, the thickness D of the testing device 20 is identical to 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 plane portion 111 after the bending portion 121 is arced, and the connection between the bending portion 121 and the extending portion 122 and the plane portion 111 has no dead-break point.
It can be understood that the bending radius R of the bending portion 121 is different, and the resilience of the bending portion 121 is different; in the test, the bending radius R of the bending portion 121 may be selected according to the actual requirement. Of course, the resilience of the bending portion 121 can be tested and recorded when the bending portion 121 is bent at different radii, and the resilience of the bending portion 121 can be checked and the material of the fixing layer can be selected according to the bending radius R when the fixing layer is actually used.
It is understood that in step S300, the placement position of the testing device 20 may be consistent with the placement 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 the position where the bending portion 121 and the plane portion 111 are engaged, the end bending position of the display panel 10 may be the position where the bending portion 121 and the extension portion 122 are engaged, and the distance l between the first end of the testing device 20 near the bending portion 121 and the initial bending position of the display panel 10 1 And a distance l between a first end of the testing device 20 near the bending part 121 and a bending end position of the display panel 10 2 No greater than 0.15mm. Optionally, the first end of the testing device 20 near the bending portion 121 is aligned with both the initial bending position of the display panel 10 and the final bending position of the display panel 10, i.e. l 1 And l 2 May all be zero in size.
Of course, the placement position of the testing device 20 is not limited thereto, and in step S300, the testing device 20 may be placed at different positions according to need, and the separation force between the display panel 10 and the supporting layer at the different positions may be measured, which is also within the scope of the present application.
Referring to fig. 4, fig. 4 is a flowchart illustrating a method for detecting resilience after bending a flexible display panel according to an embodiment of the invention.
It can be 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, and when the display panel 10 is in the second configuration, the bending portion 121 is in a bending state, and the extending portion 122 is located on the back side of the planar portion 111.
In some alternative embodiments, step S300 may specifically include:
step S310, when the display panel 10 is in the first configuration, placing the testing device 20 on the back side of the planar portion 111, and connecting the first surface of the testing device 20 to the back of the planar portion 111;
in step S320, the bending portion 121 is bent in an arc, so that the extension portion 122 is located on the back side of the planar portion 111, and the extension portion 122 is connected to the second surface of the testing device 20.
The testing device 20 is firstly placed on one side of the back surface of the plane part 111, and then the bending part 121 is bent, so that the operation is simple and convenient, and the connection of the testing device 20 with the plane part 111 and the extension part 122 is convenient.
As an alternative embodiment, the bending portion 121 may be bent first to make the display panel 10 in the second configuration, then the testing device 20 is placed between the planar portion 111 and the extension 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 extension portion 122.
In some alternative embodiments, in order to accurately measure the resilience of the bending portion 121 in practical applications, in the step of performing circular arc bending on the bending portion 121 to locate the extension portion 122 on the back side of the planar portion 111 and connecting the extension portion 122 to the second surface of the testing device 20, the extension portion 122 may be connected to the second surface of the testing device 20 in a state that the bending diameter of the bending portion 121 is 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 bent state in a method for measuring a resilience of a flexible display panel after bending according to another embodiment of the invention.
In some alternative embodiments, in step S100, the display panel 10 may further include a first supporting layer 13 and a second supporting layer 14, where the first supporting layer 13 is disposed on the back surface of the plane portion 111, and the second supporting layer 14 is disposed on a surface of the extending portion 122 facing the plane portion 111, so as to simulate the structure of the display panel 10 in practical use. 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, the first surface of the test device 20 may be connected to the first support layer 13 and the second surface to the second support layer 14.
Based on the above embodiment, as an alternative embodiment, in step S200, the thickness D of the test device 20 may satisfy the relation 2, so as to accurately measure the resilience of the bending part 121 in practical applications,
2R＝D+d 1 +d 2 2, 2
Wherein R is the bending radius of the bending part 121, d 1 D is the thickness of the first supporting layer 13 2 Is the thickness of the second support layer 14.
Alternatively, the thickness d of the first support layer 13 1 Thickness d of the second support layer 14 2 May be the same or different.
It can be understood that the bending radius R of the bending portion 121 is different, the resilience of the bending portion 121 is different, and when the resilience of the bending portion 121 when performing the circular arc bending with the preset radius needs to be measured, a measuring device having a corresponding thickness is selected.
In some optional embodiments, in the method for measuring resilience of the flexible display panel after bending, in step S100, the non-display area 12 of the display panel 10 may further include a bending transition area 123, where the bending transition area 123 connects the plane portion 111 and the bending portion 121, and the first supporting layer 13 may support the plane portion 111 and the bending transition area 123; in step S300, the bending transition region 123 and the plane portion 111 are coplanar, and the bending initial position of the display panel 10 may be a position where the bending portion 121 and the bending transition region 123 are joined, so that both sides of the bending initial position of the display panel 10 are non-display regions, which can alleviate the phenomenon of stress concentration caused by different structures of the regions at both sides of the bending initial position, and can reduce the stress acting on the plane portion 111 when the bending portion 121 bends.
In some alternative embodiments, in step S100, the display panel 10 may further include a protective layer 15, where the protective layer 15 is disposed on a front side of the display panel 10, and the protective layer 15 completely covers the bending portion 121; in step S300, the protection layer 15 may be bent synchronously with the bending portion 121 to protect the bending portion 121.
As an alternative embodiment, the protective layer 15 may at least partially cover the inflection-transition 123. Alternatively, the protection layer 15 may completely cover the bending transition region 123, so as to better relieve the bending stress at the bending initial position of the display panel 10.
As an alternative embodiment, the protective layer 15 may at least partially cover the extension 122. Alternatively, the protective layer 15 may completely cover the extension 122 of the bending transition region 123, so as to relieve bending stress at the bending end position of the display panel 10.
According to the method for measuring the resilience force after bending the flexible display panel, provided by the embodiment of the invention, the resilience force of the bending part 121 when bending with the preset radius can be accurately measured, so that a technician can better select the fixing material between the display panel 10 and the supporting layer, further, the separation risk between the display panel 10 and the supporting layer can be reduced, and the structural reliability of the display panel 10 is improved.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a testing device 20 according to an embodiment of the invention.
In addition, the embodiment of the invention also provides a testing device 20 which can be used for the method for measuring the resilience force. The test device 20 includes:
the stress detection member 21 having a first end face and a second end face opposite to each other in the thickness direction thereof;
and a fixing device 22, wherein a first end surface of the stress detection member 21 is connected to a back surface of the planar portion 111 of the display panel 10 through the fixing device 22, and a second end of the stress detection member 21 is connected to the extension portion 122 through the fixing device 22.
In the test, the testing device 20 is placed between the flat portion 111 and the extension portion 122 of the display panel 10, and the first end surface of the stress detecting member 21 is connected to the back surface of the flat portion 111 through the fixing device 22, and the second end of the stress detecting member 21 is connected to the extension 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 detecting members 21, and the plurality of stress detecting members 21 may be equally spaced apart. Alternatively, the plurality of stress detecting members 21 may be distributed in a rectangular array.
In some alternative embodiments, the stress detection component 21 may be a tension sensor or a resistance strain gauge, and the resilience force is measured by resistance change caused by micro deformation, so that the measurement accuracy is high.
In some alternative embodiments, the fixture 22 may be a vacuum adsorber or an adhesive layer.
Alternatively, when the fixing device 22 is an adhesive layer, the stress detecting member 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 high-viscosity adhesive material, so as to ensure that the adhesive layer cannot be separated from the display panel 10 in 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 other materials.
As an alternative embodiment, the dimensions of the length, width, thickness, etc. of the testing device 20 may be completely consistent with the dimensions of the original supporting layer of the display panel 10, and the placement position of the testing device 20 may be consistent with the placement position of the supporting layer during testing, 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.
It can be understood that the bending radius R of the bending portion 121 is different, the resilience of the bending portion 121 is different, and when the resilience of the bending portion 121 is required to be measured when bending is performed at a preset bending radius, a measuring device having a corresponding thickness is selected.
These embodiments are not exhaustive or to limit the invention to the precise embodiments disclosed, and according to the invention described above. 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 modifications as are suited to the particular use contemplated. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (13)
1. A method for measuring resilience of a flexible display panel after bending, comprising:
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 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 part and the extension part of the flexible display panel, the first surface of the testing device is connected with the back surface of the plane part, and the second surface of the testing device is connected with the extension part so as to test the resilience force of the bending part.
2. The method of measuring resilience after bending of a flexible display panel according to claim 1, further comprising, after the step of testing resilience of the bending 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 meets the relation 1,
p is greater than or equal to F/S type 1
Wherein F is the measured resilience of the bending part, and S is the area of the surface of the supporting layer in the thickness direction of the supporting layer.
3. The method of claim 1, wherein in the step of testing the resilience of the bending portion, the bending portion is curved and the angle between the extension 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 flat portion are engaged is a bending initial position of the display panel, the position where the bending portion and the extension portion are engaged is a bending end position of the display panel, and the testing device is close to a distance l between a first end of the bending portion and the bending initial position 1 And the distance l between the first end of the testing device, which is close to the bending part, and the position of the bending tail end 2 No greater than 0.15mm.
5. The method of claim 1, wherein the placing the test device between the planar portion and the extension portion of the flexible display panel, the first surface of the test device being connected to the back surface of the planar portion, the second surface being connected to the extension portion comprises:
placing the testing device on the back side of the planar portion, and connecting the first surface of the testing device with the back side of the planar portion;
and carrying out arc bending on the bending part, so that the extending part is positioned on the back side of the plane part, and the extending part is connected with the second surface of the testing device.
6. The method of measuring resilience after bending of a flexible display panel according to any one of claims 3 to 5, wherein in the step of providing a flexible display panel, the flexible display panel further comprises a first support layer disposed at a back surface of the planar portion and a second support layer disposed at a surface of the extending portion facing the planar portion;
in the step of testing the resilience force of the bending 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 of measuring resilience after bending of flexible display panel according to claim 6, wherein in the step of providing the test device, the thickness D of the test device satisfies the relation 2,
2R＝D+d 1 +d 2 2, 2
Wherein R is the bending radius of the bending part, d 1 D is the thickness of the first supporting layer 2 Is the thickness of the second support layer.
8. The method of claim 6, wherein in the step of providing a flexible display panel, the flexible display panel further comprises a bending transition region connecting the planar portion and the bending portion, the first support layer supporting 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 joint position of the bending part and the bending transition area is the bending initial position of the flexible display panel.
9. The method of measuring resilience after bending of a flexible display panel according to claim 6, wherein in the step of providing a flexible display panel, the flexible display panel further comprises a protective layer disposed on a front side of the display panel, the protective layer completely covering the bending portion;
in the step of testing the resilience force of the bending part, the protection layer and the bending part are synchronously bent.
10. A test device for the method of measuring resilience of a flexible display panel according to any one of claims 1 to 9 after bending, the test device comprising:
a stress detection member having a first end face and a second end face which are opposite to each other in a thickness direction thereof;
and a fixing device through which the first end face of the stress detection member is connected to the back face of the planar portion of the display panel, and the second end of the stress detection member is connected to the extension portion.
11. The test device of claim 10, wherein the test device comprises a plurality of the stress detection members, the plurality of stress detection members being equally spaced apart.
12. The test device of claim 10, wherein the fixture is a vacuum absorber or an adhesive layer.
13. The test device of claim 10, wherein the stress-detecting component comprises a resistive strain gauge.
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