CN114577451B - Method for testing service life of display panel - Google Patents
Method for testing service life of display panel Download PDFInfo
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- CN114577451B CN114577451B CN202210171934.6A CN202210171934A CN114577451B CN 114577451 B CN114577451 B CN 114577451B CN 202210171934 A CN202210171934 A CN 202210171934A CN 114577451 B CN114577451 B CN 114577451B
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- 238000012360 testing method Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 16
- 238000010998 test method Methods 0.000 claims abstract description 12
- 238000001514 detection method Methods 0.000 claims description 78
- 238000003825 pressing Methods 0.000 claims description 8
- 238000009826 distribution Methods 0.000 abstract description 25
- 239000011521 glass Substances 0.000 description 9
- 230000001133 acceleration Effects 0.000 description 5
- 230000002950 deficient Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000007688 edging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The embodiment of the application discloses a life test method of a display panel, wherein the display panel is supported by two support elements, and comprises a first section, a second section and a third section which are sequentially connected, the display panel has an actual curvature radius, and the two support elements are arranged corresponding to the second section; the display panel is bent to a preset curvature radius by adopting a force application element, the preset curvature radius is smaller than the actual curvature radius, the force application element is positioned at one side of the display panel, which is away from the support elements, and the force application element is positioned between the two support elements; acquiring the preset service life of the display panel under the preset curvature radius; and acquiring the actual service life of the display panel according to the actual curvature radius, the preset curvature radius and the preset service life. The life test method of the display panel can solve the problem that life test stress distribution is inconsistent with actual stress distribution of a product in the life test method of the existing curved surface product.
Description
Technical Field
The application relates to the field of display, in particular to a life test method of a display panel.
Background
With the development of technology, curved surface display products enter the field of vision of people. Curved display products subject the glass to a shaping stress due to the bending of the screen, compared to flat display products. In the actual production process, the curved surface display product can bear bending stress in a short period, but the fatigue effect under the long-term action is not clear, especially in the case that the curvature radius is small and the glass substrate is thicker. If the design is too conservative, such as a large radius of curvature, the curved visual effect cannot be satisfied; if the design is extremely extreme, the curvature radius is small, and the curved surface shows that the product can be broken after a period of time. This is because the substrate of curved display products is glass of brittle material, and many micro-cracks are generated during the cutting and edging process, and the breaking strength of the glass depends on the number and size of the micro-cracks. As time increases, microcracks at the edges of the glass in a bent state also increase, and the breaking strength decreases. When it reaches a certain number and size, the breaking strength cannot withstand the bending stress of the glass, and the bent glass will crack.
In order to ensure the quality of the curved surface display product and avoid the problem of fragmentation when a terminal customer uses the curved surface display product, the curved surface display product needs to be subjected to a severe reliability test. For the verification of the curved surface strength, a high curvature acceleration experiment is often adopted to evaluate the service life of the curved surface display product, namely, the curved surface display product is bent to a higher curvature state and is kept stand, and the service life of the curved surface display product is recorded.
At present, a pure circular arc jig is adopted in a high-curvature acceleration experiment, and is used for clamping a curved surface display product, so that the curved surface display product is bent to a higher curvature. In addition, the existing pure circular arc jig cannot be compatible with products with different curvatures, the curvature of the pure circular arc jig is fixed, and the pure circular arc jig is suitable for curved surface display products with specific curvatures, so that the jig is frequently manufactured according to the curved surface display products with different curvatures, and cost and time loss are caused.
Disclosure of Invention
The embodiment of the application provides a life test method of a display panel, which can solve the problem that life test stress distribution is inconsistent with actual stress distribution of a product in the life test method of the existing curved surface product, can realize equivalent detection, is beneficial to accurately estimating the defective rate of the market and improves the reliability of the product; meanwhile, the method can be compatible with products with different curvatures, and the manufacturing cost of the jig is reduced.
The embodiment of the application provides a service life testing method of a display panel, which comprises the following steps:
step B1, supporting a display panel by adopting two supporting elements, wherein the display panel has an actual curvature radius, the display panel comprises a first section, a second section and a third section which are sequentially connected, and the two supporting elements are arranged corresponding to the second section;
step B2, pressing down the display panel by using a force application element to bend the display panel to a preset curvature radius, wherein the preset curvature radius is smaller than the actual curvature radius, the force application element is positioned on one side of the display panel, which is away from the support elements, and the force application element is positioned between the two support elements;
step B3, acquiring the preset service life of the display panel under the preset curvature radius;
and step B4, acquiring the actual service life of the display panel according to the actual curvature radius, the preset curvature radius and the preset service life.
Optionally, in some embodiments of the present application, in the step B1, the supporting element abuts against a supporting portion of the display panel;
in the step B2, the force application element abuts against the force receiving portion of the display panel, at least two force application elements are adopted to press down the force receiving portion of the display panel, and all the force receiving portions are symmetrically arranged about a central axis between the two support portions.
Optionally, in some embodiments of the present application, the two support portions are symmetrically disposed about a central axis of the second section.
Optionally, in some embodiments of the present application, a distance between two of the force receiving portions located at the outermost side satisfies the following formula:
0.45×ΔL≤L1≤0.65×ΔL；
wherein L1 is the length between the two outermost force receiving portions, and Δl is the length between the two supporting portions.
Optionally, in some embodiments of the present application, the step B2 includes:
step B21, adopting the force application element to press down the display panel;
step B22, acquiring coordinates of a first detection point and coordinates of a second detection point of the display panel, wherein the first detection point and the second detection point are positioned between the two supporting parts;
and step B23, acquiring a preset curvature radius of the display panel according to the coordinates of the first detection point and the coordinates of the second detection point.
Optionally, in some embodiments of the present application, in the step B22, the first detection point is a midpoint between two of the supporting parts, and the second detection point is located between the first detection point and one of the supporting parts.
Optionally, in some embodiments of the present application, in the step B22, the second detection point overlaps the force receiving portion.
Optionally, in some embodiments of the present application, in the step B23, a relationship among the coordinates of the first detection point, the coordinates of the second detection point, and the preset radius of curvature is:
wherein X1 is the abscissa of the first detection point, Y1 is the ordinate of the first detection point, X2 is the abscissa of the second detection point, Y2 is the ordinate of the second detection point, and R1 is the preset radius of curvature.
Optionally, in some embodiments of the present application, in the step B4, a relationship among the preset radius of curvature, the preset lifetime, the actual radius of curvature, and the actual lifetime is:
wherein T1 is the preset lifetime, R1 is the preset radius of curvature, T2 is the actual lifetime, R2 is the actual radius of curvature of the display panel, and n is the fatigue coefficient.
Optionally, in some embodiments of the present application, in the step B4, the range of values of the fatigue coefficient n is: n is more than or equal to 15 and less than or equal to 21.
According to the life testing method of the display panel, the two support elements are supported on the second section of the display panel, and the force application element is adopted between the two support elements to press down the display panel so as to bend the display panel, so that the display panel is bent to a higher curvature state. Curved display products generally include a curved section and straight sections disposed on opposite sides of the curved section, with the stress distribution of the curved section increasing gradually from the sides toward the middle during actual use, while the straight sections have little stress. By adopting the life test method of the display panel, the first end and the third section on the two opposite sides of the display panel cannot be bent, so that the stress distribution of the display panel in the test process is more consistent with the actual stress distribution of the display panel, the problem that the life test stress distribution is inconsistent with the actual stress distribution of the product in the life test method of the existing curved surface product can be solved, equivalent detection can be realized, accurate prediction of the defective rate of the market is facilitated, and the reliability of the product is improved; meanwhile, the method can be compatible with products with different curvatures, and the manufacturing cost of the jig is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of the operation of a high curvature acceleration experiment provided in the comparative example of the present application;
FIG. 2 is a schematic diagram of stress distribution of a display panel according to an embodiment of the present disclosure;
FIG. 3 is a flowchart illustrating a method for testing the lifetime of a display panel according to an embodiment of the present disclosure;
FIG. 4 is a schematic operation diagram of step B1 provided in an embodiment of the present application;
FIG. 5 is a schematic operation diagram of step B2 provided in an embodiment of the present application;
fig. 6 is a schematic diagram of a life testing method of a display panel according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments herein without making any inventive effort, are intended to be within the scope of the present application. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper" and "lower" are used to generally refer to the upper and lower positions of the device in actual use or operation, and specifically the orientation of the drawing figures; while "inner" and "outer" are for the outline of the device.
The embodiment of the application provides a life test method of a display panel. The following will describe in detail. The following description of the embodiments is not intended to limit the preferred embodiments.
Referring to fig. 1, in order to evaluate the service life of the curved display product 1, a high curvature acceleration experiment is required to perform by bending the curved display product 1 to a higher curvature state, standing, and recording the service life of the curved display product 1. As shown in fig. 1 and 2, the curved display product 1 includes a curved section 11 and straight sections 12 provided on opposite sides of the curved section 11, and in actual use, the stress distribution of the curved section 11 gradually increases from both sides toward the middle, while the straight sections 12 have almost no stress. If the curved surface display product 1 is clamped by the pure arc jig 2 so that the curved surface display product 1 is bent to a higher curvature, the straight line section 12 is bent and bears a certain stress, so that the stress distribution of the product in the test process is greatly different from the actual stress distribution of the product, the equivalent detection of the product cannot be realized, and the reliability evaluation result is reduced.
In addition, the pure circular arc jig 2 cannot be compatible with products with different curvatures, the curvature of the pure circular arc jig 2 is fixed, and the pure circular arc jig 2 is suitable for curved surface display products 1 with specific curvatures, namely, the curvature of the pure circular arc jig 2 corresponding to the curved surface display products 1 with high curvature is higher than the curvature of the pure circular arc jig 2 corresponding to the curved surface display products 1 with low curvature, so that the jig 2 needs to be frequently manufactured according to the curved surface display products 1 with different curvatures, and cost and time loss are caused.
Referring to fig. 3, an embodiment of the present application provides a lifetime testing method of a display panel, including the following steps:
in step B1, as shown in fig. 4, two supporting elements 200 are used to support the display panel 100, the display panel 100 has an actual radius of curvature, the display panel 100 includes a first segment 110, a second segment 120 and a third segment 130 connected in sequence, the two supporting elements 200 are disposed corresponding to the second segment 120, i.e. the two supporting elements 200 are supported on the second segment 120 of the display panel 100, and the first segment 110 and the third segment 130 of the display panel 100 are not in contact with the supporting elements 200;
in step B2, as shown in fig. 4 and fig. 5, the display panel 100 is pressed down by the force application element 300 to bend the display panel 100 to a preset radius of curvature, wherein the preset radius of curvature is smaller than the actual radius of curvature, the force application element 300 is located on one side of the display panel 100 facing away from the support elements 200, and the force application element 300 is located between the two support elements 200, so that a portion of the display panel 100 corresponding to the space between the two support elements 200 can be bent to a higher curvature, so as to facilitate the life acceleration experiment;
step B3, acquiring the preset lifetime of the display panel 100 under the preset curvature radius, specifically, the preset lifetime can be acquired through timing, that is, the display panel 100 is bent to the preset curvature radius in step B2 and timing is performed until the display panel 100 breaks or is damaged, so as to acquire the preset lifetime under the preset curvature radius;
step B4, obtaining the actual life of the display panel 100 according to the actual curvature radius, the preset curvature radius and the preset life. In the embodiment of the present application, the first segment 110 and the third segment 130 are straight segments, the second segment 120 is a curved segment, and the first segment 110 and the third segment 130 are respectively connected to two sides of the second segment 120.
In the lifetime test method of the display panel according to the embodiment of the present application, by using two support elements 200 to support the second section 120 of the display panel 100, the display panel 100 is bent by pressing the display panel 100 between the two support elements 200 using the force application element 300, so that the display panel 100 is bent to a higher curvature state. As can be seen from fig. 2, fig. 4 and fig. 5, in the testing process, the first end and the third section 130 on opposite sides of the display panel 100 are not bent, so that the stress distribution of the display panel 100 in the testing process is more consistent with the actual stress distribution of the display panel 100, the occurrence of the condition that the first section 110 and the third section 130 are too tightly detected is effectively avoided, the problem that the life test stress distribution is inconsistent with the actual stress distribution of the product in the life test method of the existing curved surface product can be solved, the equivalent detection can be realized, the accurate estimation of the market defect rate is facilitated, and the reliability of the product is improved; meanwhile, the method can be compatible with products with different curvatures, and the manufacturing cost of the jig is reduced.
Specifically, in step B1, the two support elements 200 are respectively disposed at two ends of the second section 120, which, of course, is set according to the actual situation and specific requirements, and the two support elements 200 may be disposed between two ends of the second section 120, so long as the two support elements 200 are ensured to be disposed corresponding to the second section 120, which is not limited only herein.
Specifically, in step B1, the supporting element 200 abuts against the supporting portion 121 of the display panel 100; in step B2, the force application elements 300 are abutted against the force receiving portions 122 of the display panel 100, and at least two force application elements 300 are adopted to press down the force receiving portions 122 of the display panel 100, and all the force receiving portions 122 are symmetrically arranged about the central axis between the two supporting portions 121. With this arrangement, the position of the acting force applied by the display panel 100 under the pressing is symmetrical about the central axis between the two supporting portions 121, so that the test stress distribution of the product is similar to the actual stress distribution of the product, thereby realizing equivalent detection, facilitating accurate estimation of the defective rate of the market, and improving the reliability of the product.
Specifically, when the display panel 100 is pressed down by using an even number of force application elements 300, the display panel 100 is correspondingly provided with an even number of force receiving portions 122, and the even number of force receiving portions 122 are symmetrical about a central axis between the two supporting portions 121; when the display panel 100 is pressed down by using the odd force application elements 300, the display panel 100 is correspondingly provided with the odd force application portions 122, the odd force application portions 122 are symmetrical about the central axis between the two support portions 121, specifically, the middle force application portion 122 is arranged corresponding to the central axis between the two support portions 121, and the force application portions 122 on two sides are symmetrical about the central axis between the two support portions 121.
As shown in fig. 4 and 5, when the display panel 100 is pressed down by using two force application elements 300 in the embodiment of the present application, the display panel 100 is correspondingly provided with two force receiving portions 122 in sequence, and the first force receiving portion 122 and the second force receiving portion 122 are symmetrical about a central axis between the two supporting portions 121. When the display panel 100 is pressed down by the three force application elements 300 in the embodiment of the application, the display panel 100 is correspondingly and sequentially provided with three force receiving portions 122, wherein the second force receiving portion 122 is arranged corresponding to the central axis between the two supporting portions 121, and the first force receiving portion 122 and the third force receiving portion 122 are symmetrical with respect to the central axis between the two supporting portions 121. It will be appreciated that the number of force applying elements 300 and the number of force receiving portions 122 may be appropriately adjusted according to the actual situation and the specific requirement, which is not limited herein.
Specifically, the pressing forces borne by the two force receiving portions 122 symmetrical about the central axis between the two support portions 121 are equal. With this arrangement, the magnitude and distribution of the pressing force applied to the display panel 100 are symmetrical about the central axis between the two supporting portions 121, so that the test stress distribution of the product is similar to the actual stress distribution of the product, thereby realizing equivalent detection, facilitating accurate estimation of the defective rate of the market, and improving the reliability of the product.
Specifically, the two support portions 121 are symmetrically disposed about the central axis of the second section 120. With this arrangement, the position of the force applied by the second section 120 of the display panel 100 under the pressing is symmetrical about the central axis of the second section 120, so that the test stress distribution of the product is similar to the actual stress distribution of the product, thereby realizing equivalent detection, facilitating accurate estimation of the defective rate of the market, and improving the reliability of the product.
Specifically, as shown in fig. 4 and 5, the distance between the outermost two force application elements 300 affects the high stress area ratio and the stress growth trend, and in order to match the actual stress distribution of the product, the distance between the outermost two force receiving portions 122 satisfies the following formula:
0.45×ΔL≤L1≤0.65×ΔL；
where L1 is the length on the display panel between the two outermost force receiving portions 122, and Δl is the length on the display panel between the two supporting portions 121. In this embodiment, the curvature of the display panel 100 may be adjusted by adjusting the magnitude of the pressing force.
Specifically, in the embodiment of the present application, as shown in fig. 4 to 6, the step B2 includes:
step B21, using the force application element 300 to press down the display panel 100;
step B22, acquiring coordinates of a first detection point a and coordinates of a second detection point B of the display panel 100, where the first detection point a and the second detection point B are located between the two supporting parts 121;
step B23, obtaining the preset curvature radius of the display panel 100 according to the coordinates of the first detection point a and the coordinates of the second detection point B. In the embodiment of the present application, after the display panel 100 is bent to a higher curvature state, a preset curvature radius of the display panel 100 in the higher curvature state is calculated by the coordinates of the first detection point a and the coordinates of the second detection point B. In the embodiment of the present application, as shown in fig. 6, under the display panel 100 in a flat state, a rectangular coordinate system is established with a midpoint between the two supporting portions 121 as an origin; then, the display panel 100 under the preset radius of curvature acquires the coordinates of the first detection point a and the coordinates of the second detection point B.
Specifically, in step B22, the first detection point a is a point on the display panel 100 equal to the midpoint abscissa between the two supporting portions 121, and the second detection point B is located between the first detection point a and one of the supporting portions 121. Of course, the specific positions of the first detection point a and the second detection point B may be modified appropriately according to the actual situation selection and the specific requirement setting, so long as the first detection point a and the second detection point B are ensured to be located between the two supporting portions 121, which is not limited only herein.
Specifically, in step B22, the second detection point B overlaps the force receiving portion 122, i.e., the second detection point B is the force receiving portion 122. Of course, the specific position of the second detection point B may be modified appropriately according to the actual situation selection and specific requirement setting, so long as the second detection point B is ensured to be located between the two supporting portions 121, which is not limited only herein.
Specifically, in step B23, the coordinates of the first detection point a are (X1, Y1), the coordinates of the second detection point B are (X2, Y2), and the relationship among the coordinates of the first detection point a, the coordinates of the second detection point B, and the preset radius of curvature is:
wherein X1 is an abscissa of the first detection point a, Y1 is an ordinate of the first detection point a, X2 is an abscissa of the second detection point B, Y2 is an ordinate of the second detection point B, R1 is a preset radius of curvature, and units of the abscissa, the ordinate, and the preset radius of curvature may be measurement units such as millimeters, centimeters, decimeters, or meters, which are not limited only herein. In the embodiment of the present application, the preset radius of curvature may be calculated by the coordinates of the first detection point a and the coordinates of the second detection point B.
Specifically, when the first detection point a and the first detection point a are the midpoint between the two supporting portions 121, that is, the value of X1 is 0, that is, the coordinates of the first detection point a are (0, Y1), in this embodiment, the formula of the relationship among the coordinates of the first detection point a, the coordinates of the second detection point B and the preset radius of curvature is simplified as follows:
wherein Y1 is the ordinate of the first detection point a, X2 is the abscissa of the second detection point B, Y2 is the ordinate of the second detection point B, and R1 is a preset radius of curvature.
Specifically, in step B4, the relationship among the preset radius of curvature, the preset lifetime, the actual radius of curvature, and the actual lifetime is:
wherein T1 is a preset lifetime, R1 is a preset radius of curvature, T2 is an actual lifetime, R2 is an actual radius of curvature of the display panel 100, and n is a fatigue coefficient. In the embodiment of the present application, R2 is an actual radius of curvature of the display panel 100, which is a known factory parameter, and the actual lifetime can be calculated through a preset radius of curvature, a preset lifetime, and an actual radius of curvature.
Specifically, in step B4, the range of the fatigue coefficient n is mainly related to the substrate material of the display panel 100, and in this embodiment, the substrate of the display panel 100 is glass, and the range of the fatigue coefficient n of the glass is: n is more than or equal to 15 and less than or equal to 21. It will be appreciated that the value of the fatigue coefficient n may be appropriately adjusted according to the actual situation selection and the specific requirement setting, and is not limited only herein.
The foregoing has described in detail the method for testing the lifetime of a display panel provided by the embodiments of the present application, and specific examples have been applied herein to illustrate the principles and embodiments of the present application, and the description of the foregoing examples is only for aiding in understanding the method and core idea of the present application; meanwhile, those skilled in the art will have variations in the specific embodiments and application scope in light of the ideas of the present application, and the present description should not be construed as limiting the present application in view of the above.
Claims (8)
1. A life test method of a display panel is characterized by comprising the following steps:
step B1, supporting a display panel by adopting two supporting elements, wherein the display panel has an actual curvature radius, the display panel comprises a first section, a second section and a third section which are sequentially connected, and the two supporting elements are arranged corresponding to the second section;
step B2, pressing down the display panel by using a force application element to bend the display panel to a preset curvature radius, wherein the preset curvature radius is smaller than the actual curvature radius, the force application element is positioned on one side of the display panel, which is away from the support elements, and the force application element is positioned between the two support elements;
step B3, acquiring the preset service life of the display panel under the preset curvature radius;
step B4, acquiring the actual service life of the display panel according to the actual curvature radius, the preset curvature radius and the preset service life;
wherein in the step B1, the supporting member abuts against a supporting portion of the display panel;
in the step B2, the force application element is abutted against the force receiving portion of the display panel, at least two force application elements are adopted to press down the force receiving portion of the display panel, and all the force receiving portions are symmetrically arranged about a central axis between the two support portions;
the distance between the two force receiving portions located at the outermost side satisfies the following formula:
0.45×ΔL≤L1≤0.65×ΔL；
wherein L1 is the length between the two outermost force receiving portions, and Δl is the length between the two supporting portions.
2. The lifetime testing method of display panel of claim 1, wherein two of said supporting parts are symmetrically disposed with respect to a central axis of said second segment.
3. The lifetime testing method of display panel according to claim 1, wherein said step B2 comprises:
step B21, adopting the force application element to press down the display panel;
step B22, acquiring coordinates of a first detection point and coordinates of a second detection point of the display panel, wherein the first detection point and the second detection point are positioned between the two supporting parts;
and step B23, acquiring a preset curvature radius of the display panel according to the coordinates of the first detection point and the coordinates of the second detection point.
4. The method of claim 3, wherein in the step B22, the first detection point is a midpoint between two of the supporting parts, and the second detection point is located between the first detection point and one of the supporting parts.
5. The method according to claim 3, wherein in the step B22, the second detection point overlaps the force receiving portion.
6. The lifetime testing method of display panel according to claim 3, wherein in said step B23, a relationship among coordinates of said first detection point, coordinates of said second detection point and said preset radius of curvature is:
wherein X1 is the abscissa of the first detection point, Y1 is the ordinate of the first detection point, X2 is the abscissa of the second detection point, Y2 is the ordinate of the second detection point, and R1 is the preset radius of curvature.
7. The lifetime testing method of display panels according to claim 1, wherein in the step B4, the relationship among the preset radius of curvature, the preset lifetime, the actual radius of curvature, and the actual lifetime is:
wherein T1 is the preset lifetime, R1 is the preset radius of curvature, T2 is the actual lifetime, R2 is the actual radius of curvature of the display panel, and n is the fatigue coefficient.
8. The method for testing the lifetime of a display panel according to claim 7, wherein in said step B4, the range of values of said fatigue coefficient n is: n is more than or equal to 15 and less than or equal to 21.
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