Method for evaluating bending performance of flexible screen

Abstract

This application relates to a method for evaluating the bending performance of a flexible screen. The evaluation method includes: providing a flexible screen, the flexible screen including a main body and a bending portion adjacent to the main body; applying pressure to the bending portion along a first direction; and obtaining a first pressure F corresponding to when the flexible screen is damaged by pressure. 1 Apply pressure along the second direction to the bent portion and obtain the second pressure F corresponding to the time when the flexible screen is damaged. 2 The second direction intersects the first direction; based on the first pressure F 1 and the second pressure F 2 The ultimate pressure F that causes the flexible screen to fail is calculated. This ultimate pressure F is used as an evaluation index for the strength of the bending zone. This evaluation index is a comprehensive assessment of the pressure bearing capacity of the bending part in different directions. Using this quantitative evaluation index as a reference can help improve the yield of products assembled by assembly personnel and can also provide valuable reference for designers when making design improvements.

Description

Evaluation methods for the bending performance of flexible screens Technical Field

[0001] This application relates to the field of display technology, and in particular to a method for evaluating the bending performance of a flexible screen. Background Technology

[0002] Currently, flexible screens are widely used in electronic devices such as mobile phones and tablets. During the manufacturing process of these devices, flexible screens often need to be bent and assembled. During the bending process and while still bent, flexible screens are prone to various defects due to uneven stress or external forces, ultimately affecting product yield. To avoid these problems, it is necessary to understand the strength of the bent portion of each flexible screen to be assembled. This information can provide a reference for assembly personnel during bending and assembly, or a basis for designers to make design improvements.

[0003] Therefore, how to measure and quantify the strength of the bent portion of a flexible screen is an urgent problem to be solved. Summary of the Invention

[0004] Therefore, it is necessary to provide a method for evaluating the bending performance of flexible screens, which aims to quantitatively evaluate the strength of the bent portion of the flexible screen in a quantitative manner, so as to provide a reference for assemblers when performing bending assembly, or to provide a basis for designers when making design improvements.

[0005] According to one aspect of this application, a method for evaluating the bending performance of a flexible screen is provided, the evaluation method comprising:

[0006] A flexible screen is provided, which includes a main body and a bent portion adjacent to the main body;

[0007] Apply pressure to the bent portion along the first direction and obtain the first pressure F1 corresponding to the time when the flexible screen is damaged.

[0008] Apply pressure to the bent portion along the second direction to obtain the second pressure F2 corresponding to the time when the flexible screen is damaged, wherein the second direction intersects with the first direction;

[0009] Based on the first pressure F1 and the second pressure F2, calculate the ultimate pressure F that causes the flexible screen to fail.

[0010] The method for evaluating the bending performance of a flexible screen according to embodiments of this application can measure the strength of the bent portion of the flexible screen and obtain a quantitative index for evaluating the strength of the bent portion. Since the bent portion of the flexible screen has an approximately semi-circular bending shape, its ability to withstand pressure from different directions varies. Therefore, if the pressure that the bent portion can withstand is measured only in one direction, and this measurement result is used as a quantitative evaluation index for the strength of the bent portion, the index will be inaccurate, leading to assembly personnel being unable to effectively improve yield when using this index for assembly. The evaluation method in this embodiment applies pressure to the bent portion of the flexible screen along a first direction and obtains a first pressure F1 corresponding to the time when the flexible screen is damaged. It then applies pressure to the bent portion along a second direction and obtains a second pressure F2 corresponding to the time when the flexible screen is damaged. This obtains the pressure bearing capacity of the bent portion in two mutually perpendicular directions. Based on the first pressure F1 and the second pressure F2, the ultimate pressure F that causes the flexible screen to fail is calculated, and this ultimate pressure F is used as a quantitative evaluation index for the strength of the bent portion. Thus, this quantitative evaluation index is a comprehensive assessment result of the pressure bearing capacity of the bending part in different directions. Using this quantitative evaluation index as a reference can help improve the yield of products assembled by assembly personnel, and can also provide valuable reference for designers when making design improvements.

[0011] In some embodiments, the step of applying pressure to the bend along the first direction includes:

[0012] In the first direction, the pressure head of the force measuring device is brought into parallel contact with the first part of the bent portion, and the length of the pressure head is able to cover the length of the first part;

[0013] The step of applying pressure to the bend along the second direction includes:

[0014] In the second direction, the pressure head contacts the second part of the bend in parallel, and the length of the pressure head can cover the length of the second part;

[0015] The second direction is perpendicular to the first direction.

[0016] In some embodiments, the length of the first part and the length of the second part are equal.

[0017] In some embodiments, the length of the pressure head is 1 to 1.1 times the length of the first part.

[0018] In some embodiments, the width of the pressure head is less than or equal to half the bending radius of the bend.

[0019] In some embodiments, the ultimate pressure F is obtained by the following formula:

[0020] In some embodiments, the step of applying pressure to the bent portion along a first direction and obtaining the first pressure F1 corresponding to the time when the flexible screen is damaged includes:

[0021] Using a force measuring device, the bending part is subjected to different pressure values ​​multiple times along the first direction. After each pressure is applied, the flexible screen is checked to see if it is damaged. The pressure value corresponding to the damage to the flexible screen is taken as the first pressure F1.

[0022] In some embodiments, the force measuring device maintains pressure on the bent portion for a preset duration.

[0023] In some embodiments, the preset duration is 10s to 15s.

[0024] In some embodiments, the step of applying pressure to the bent portion along the second direction and obtaining the second pressure F2 corresponding to the time when the flexible screen is damaged includes:

[0025] Using a force measuring device, the bent part is subjected to multiple loads of different pressure values ​​along the second direction. After each load, the flexible screen is checked to see if it is damaged. The pressure value corresponding to the damage to the flexible screen is taken as the second pressure F2.

[0026] In some embodiments, the force measuring device maintains pressure on the bent portion for a preset duration.

[0027] In some embodiments, the preset duration is 10s to 15s.

[0028] In some embodiments, the step of applying pressure to the bend includes:

[0029] The pressure head is configured to move toward the bend at a speed not exceeding 5 mm / min to gradually apply pressure.

[0030] In some embodiments, the pressure head includes a pressure section made of rubber or silicone.

[0031] In some embodiments, the step of checking whether the flexible screen is damaged after each applied pressure includes:

[0032] Remove the flexible screen from the force measuring device;

[0033] Turn on the flexible screen and display the preset image on it;

[0034] When a flexible screen exhibits abnormal brightness or display, it is determined that the flexible screen has been damaged by pressure.

[0035] In some embodiments, the step of checking whether the flexible screen is damaged after each applied pressure includes:

[0036] Remove the flexible screen from the force measuring device;

[0037] The bent portion of the flexible screen was observed using a microscope;

[0038] When film peeling is observed at the bend, it is determined that the flexible screen has been damaged by pressure.

[0039] In some embodiments, the step of checking whether the flexible screen is damaged after each applied pressure includes:

[0040] Remove the flexible screen from the force measuring device;

[0041] Turn on the flexible screen and display the preset image on it;

[0042] If the flexible screen exhibits abnormal brightness or image quality, it is determined that the flexible screen has been damaged by pressure. If the flexible screen does not exhibit abnormal brightness or image quality, the bent portion of the flexible screen is observed using a microscope. When film peeling is observed at the bent portion, it is determined that the flexible screen has been damaged by pressure. Attached Figure Description

[0043] Figure 1 is a schematic diagram of a flexible screen in related technologies;

[0044] Figure 2 is a flowchart illustrating a method for evaluating the bending performance of a flexible screen according to an embodiment of this application.

[0045] Figure 3 is a schematic diagram of applying pressure to the bent portion along the first direction in one embodiment of this application;

[0046] Figure 4 is a front view schematic diagram of a bending portion under pressure along the first direction in an embodiment of this application;

[0047] Figure 5 is a side view of a bending portion under pressure along the first direction in an embodiment of this application.

[0048] Figure 6 is a front view schematic diagram of a bending portion under pressure along the second direction in an embodiment of this application;

[0049] Figure 7 is a side view of a bending portion under pressure along the second direction in one embodiment of this application. Detailed Implementation

[0050] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of this application.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0052] When describing positional relationships, unless otherwise specified, when an element such as a layer, film, or substrate is referred to as being "on" another element, it may be directly on the other element or there may be intermediate elements present. Furthermore, when a layer is referred to as being "below" another layer, it may be directly below it or there may be one or more light-emitting units present. It is also understood that when a layer is referred to as being "between" two layers, it may be the only layer between the two layers, or there may be one or more light-emitting units present.

[0053] When using the terms “including,” “having,” and “comprising” as described herein, another component may be added unless explicitly qualifying terms such as “only,” “consisting of,” etc. are used. Unless otherwise stated, singular terms may include plural forms and should not be construed as having a quantity of one.

[0054] It should be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, without departing from the scope of this application, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.

[0055] It should also be understood that, in interpreting an element, although not explicitly described, the element is interpreted as including a range of error, which should be within the acceptable deviation range of a particular value as determined by a person skilled in the art. For example, "approximately," "about," or "substantially" can mean within one or more standard deviations, without limitation herein.

[0056] Furthermore, in the instruction manual, the phrase "planar distribution diagram" refers to the diagram when the target part is viewed from above, and the phrase "cross-sectional diagram" refers to the diagram when the target part is viewed from the side as a cross-section taken by vertically cutting the target part.

[0057] Furthermore, the accompanying drawings are not drawn to a 1:1 scale, and the relative dimensions of the components are shown in the drawings only as examples and not necessarily to actual scale.

[0058] Currently, flexible screens are widely used in electronic devices such as mobile phones and tablets. During the manufacturing process of these devices, it is often necessary to bend and assemble the flexible screen. For example, based on market demand for increasingly narrower chins on mobile phones, pad bending technology was developed to bend the flexible screen to reduce the size of the chin. As shown in Figure 1, the bent flexible screen 10 includes a main body 100, a bonding part 300, and a bending part 200 located between the main body 100 and the bonding part 300. The main body 100 is used to display the image and is typically flat.

[0059] Because the thickness of the bent portion 200 of the flexible screen 10 is thinner than that of the main body 100, the film layers of the bent portion 200 will be compressed and form a stable semi-circular arc state during bending. If the film layers are subjected to excessive force, problems such as film peeling and breakage may occur. Therefore, the flexible screen 10 may experience uneven stress or be affected by external forces during bending and while in a bent state, ultimately affecting the product yield. To avoid these problems, it is necessary to understand the strength of the bent portions of each flexible screen to be assembled, providing a reference for assembly personnel during bending assembly or a basis for designers to make design improvements. In related technologies, because the bent portion 200 of the flexible screen 10 is in a bent state, conventional strength testing methods are difficult to implement directly on the bent portion. Therefore, currently, there is no effective measurement method or quantitative evaluation index for the strength of the bent portion 200 of the flexible screen.

[0060] To address the aforementioned problems, this application proposes a method for evaluating the bending performance of a flexible screen. Referring to Figures 2, 3, 4, 5, 6, and 7, the evaluation method includes:

[0061] Step S10: Provide a flexible screen 10, which includes a main body 100 and a bent portion 200 adjacent to the main body 100;

[0062] Step S20: Apply pressure to the bent portion 200 along the first direction to obtain the first pressure F1 corresponding to the time when the flexible screen 10 is damaged;

[0063] Step S30: Apply pressure to the bent portion 200 along the second direction to obtain the second pressure F2 corresponding to the time when the flexible screen 10 is damaged, wherein the second direction intersects with the first direction;

[0064] Step S40: Based on the first pressure F1 and the second pressure F2, calculate the ultimate pressure F that causes the flexible screen 10 to fail. The bending performance evaluation method of the flexible screen according to this embodiment of the application can measure the strength of the bent portion 200 of the flexible screen 10 and obtain a quantitative index for evaluating the strength of the bent portion 200. Since the bent portion 200 of the flexible screen 10 has an approximately semi-circular bending shape, its ability to withstand pressure from different directions varies. Therefore, if the pressure that the bent portion 200 can withstand is measured only in one direction, and this measurement result is used as a quantitative evaluation index of the strength of the bent portion 200, the index will be inaccurate, resulting in assembly personnel being unable to effectively improve yield when referring to this index for assembly. The evaluation method in this embodiment applies pressure to the bent portion 200 of the flexible screen 10 along a first direction and obtains the first pressure F1 corresponding to the point where the flexible screen 10 is damaged. Pressure is then applied to the bent portion 200 along a second direction and the second pressure F2 corresponding to the point where the flexible screen 10 is damaged is obtained. This yields the critical pressure values ​​of the bent portion 200 in the two intersecting directions. Based on the first pressure F1 and the second pressure F2, the ultimate pressure F that causes the flexible screen to fail is calculated, and this ultimate pressure F is used as a quantitative evaluation index of the strength of the bent portion 200. Thus, this quantitative evaluation index is a comprehensive evaluation result of the pressure bearing capacity of the bent portion 200 in different directions. Using this quantitative evaluation index as a reference helps improve the yield rate of products assembled by assemblers and can also provide valuable reference for designers when making design improvements.

[0065] In some embodiments, the step of applying pressure to the bending portion 200 in a first direction includes: in the first direction, making the pressure head 210 of the force measuring device contact the first portion 201 of the bending portion 200 in parallel, and the length of the pressure head 210 can cover the length of the first portion 201.

[0066] The step of applying pressure to the bend 200 along the second direction includes:

[0067] In the second direction, the pressure head 210 is brought into parallel contact with the second part 202 of the bent portion 200, and the length of the pressure head 210 is able to cover the length of the second part 202.

[0068] The second direction is perpendicular to the first direction.

[0069] It is understandable that the main body 100 of the flexible screen 10 is also the straight part of the flexible screen 10, the first part 201 of the bent part 200 is the part of the bent part 200 that connects with the main body 100, and the second part 202 of the bent part 200 is a part different from the first part 201. During the loading test of the flexible screen 10, the pressure head 210 needs to be fixed on the connecting rod 20 of the force measuring device first, and then pressure is applied to the flexible screen 10 using the pressure head 210. In this embodiment, the first direction and the second direction are perpendicular to each other. In the first direction, the pressure head 210 contacts the first portion 201 of the bent portion 200 in parallel, and in the second direction, the pressure head 210 contacts the second portion 202 of the bent portion 200 in parallel. This allows pressure to be applied to the bent portion 200 along the first direction when the main body 100 of the flexible screen 10 is fixed in the horizontal direction, and pressure to be applied to the bent portion 200 along the second direction when the main body 100 of the flexible screen 10 is fixed in the vertical direction. This arrangement ensures that when pressure is applied to the bent portion 200 along the first and second directions, the main body 100 of the flexible screen 10 is in either a parallel or vertical direction. In both states, the flexible screen 10 can be easily fixed to the force measuring device. If the main body 100 of the flexible screen 10 is not in a parallel or vertical direction, it increases the difficulty of fixing the flexible screen 10, reduces the repeatability of the loading test, and decreases the reliability of the measurement results. Therefore, the loading method used in this embodiment can reduce the difficulty of fixing the flexible screen 10 and make the measurement results more reliable. In addition, during the test, the length of the pressure head 210 can cover the length of the first part 201 and the length of the second part 202. In this way, the uniformity of force on the first part 201 and the second part 202 in their length direction can be guaranteed during the loading process.

[0070] In some embodiments, the length of the first portion 201 and the length of the second portion 202 are equal. It is understood that the lengths of all portions of the bent portion 200 are uniform. This way, the flexible screen does not increase the difficulty of manufacturing processes.

[0071] Furthermore, the length of the pressure head 210 is 1 to 1.1 times the length of the first part 201. Since the lengths of the first part 201 and the second part 202 are equal, the length of the pressure head 210 is also 1 to 1.1 times the length of the second part 202. This ensures that the length of the pressure head 210 covers the lengths of both the first part 201 and the second part 202, thereby guaranteeing uniform force distribution on the first part 201 and the second part 202 along their length direction during loading.

[0072] In some embodiments, the width of the indenter 210 is less than or equal to half the bending radius of the bend 200. If the width of the indenter 210 is too large, the contact area between the indenter 210 and the bend 200 will increase due to the deformation of the indenter 210, which will affect the accuracy of the measurement results. In this embodiment, the width of the indenter 210 is set to be less than or equal to half the bending radius of the bend 200. Through repeated experiments, the inventors have found that the width of the indenter 210 within this range has little impact on the measurement results and can ensure the accuracy of the measurement results.

[0073] In some embodiments, the ultimate pressure F is obtained by the following formula:

[0074] The ultimate pressure F is calculated based on the first pressure F1 obtained by loading along the first direction and the second pressure F2 obtained by loading along the second direction. The first pressure F1 and the second pressure F2 are the pressure critical values ​​in the two directions, respectively. Therefore, the ultimate pressure F is a comprehensive evaluation result of the pressure bearing capacity of the bending part 200 in different directions.

[0075] In some embodiments, the step of applying pressure to the bent portion 200 along a first direction and obtaining the first pressure F1 corresponding to the time when the flexible screen 10 is damaged includes:

[0076] Using a force measuring device (specifically, a pressure head 210 fixed on the connecting rod 20 of the force measuring device), the bent portion 200 is repeatedly loaded with different pressure values ​​along the first direction. After each loading pressure, it is checked whether the flexible screen 10 is damaged. The pressure value corresponding to the damage of the flexible screen 10 is taken as the first pressure F1.

[0077] The force measuring device can be, for example, a benchtop push-pressure force measuring machine.

[0078] In this embodiment, an initial pressure can be set on the force measuring device first, and then the bending portion 200 is loaded along the first direction, with the loaded pressure equal to the initial pressure. Afterwards, the pressure is released, and the flexible screen 10 is inspected. If the inspection result shows that the flexible screen 10 is not damaged, a new pressure is set, and the bending portion 200 is loaded again along the first direction, with the loaded pressure equal to the new pressure. Then, the pressure is released, and the flexible screen 10 is inspected again. If the inspection result shows that the flexible screen 10 is not damaged, the pressure is adjusted and loaded again… until, during a certain loading, the inspection result of the flexible screen 10 shows that it is damaged. The pressure value corresponding to this loading is recorded, and this pressure value is used as the first pressure F1.

[0079] In some embodiments, the force measuring device applies increasing pressure to the bending portion 200 times in successive increments. That is, the pressure value of the first application can be set to be relatively small, and the pressure values ​​used for subsequent applications increase sequentially. As a result, the obtained first pressure F1 can have a smaller deviation from the actual pressure that the bending portion 200 can withstand in the first direction, thereby improving the accuracy of the finally calculated ultimate pressure F.

[0080] In some embodiments, the force measuring device maintains pressure on the bent portion 200 for a preset duration. This helps to improve the reliability of the measurement results.

[0081] To better illustrate the above process, the following example demonstrates the process of applying pressure:

[0082] First, an initial pressure of 0.5 kgf is set on the force measuring device, and the pressure increment is also set to 0.5 kgf. Then, the bending section 200 is subjected to a first load along the first direction, with a load pressure of 0.5 kgf. After holding the pressure, the pressure is released, and the flexible screen 10 is inspected. If the inspection result shows that the flexible screen 10 is not damaged, a new pressure of 1.0 kgf (the initial pressure of 0.5 kgf plus the pressure increment of 0.5 kgf) is set, and a second load is applied... This process is repeated until, after a certain load, the inspection result of the flexible screen 10 shows that it is damaged. By setting a lower initial pressure and gradually increasing the load pressure with each load, the obtained first pressure F1 can have a smaller deviation from the actual pressure that the bending section 200 can withstand in the first direction, thereby improving the accuracy of the final calculated ultimate pressure F.

[0083] Optionally, to further improve the accuracy of the measurement results, multiple flexible screens 10 to be tested can be prepared, each flexible screen 10 being a product of the same specifications. Then, the first pressure F1 is measured for each flexible screen 10 according to the above process. Then, the average value or the maximum value of each first pressure F1 is taken and substituted into the formula for calculating the resultant force to obtain the ultimate pressure F. Wherein, if the purpose of evaluating the strength of the bending portion 200 of the flexible screen 10 is to evaluate the strength level of the current product, the average value of each first pressure F1 can be taken as the basis for calculating the ultimate pressure F. If the purpose of the evaluation is to provide designers with a reference for designing an improved product, the maximum value of each first pressure F1 can be taken as the basis for calculating the ultimate pressure F.

[0084] In some embodiments, the step of applying pressure to the bent portion 200 along the second direction and obtaining the second pressure F2 corresponding to the time when the flexible screen 10 is damaged includes:

[0085] Using a force measuring device (specifically, a pressure head 210 fixed on the connecting rod 20 of the force measuring device), the bent portion 200 is repeatedly loaded with different pressure values ​​along the second direction. After each loading pressure, it is checked whether the flexible screen 10 is damaged. The pressure value corresponding to the damage of the flexible screen 10 is taken as the second pressure F2.

[0086] In this embodiment, an initial pressure can be set on the force measuring device first, and then the bending portion 200 is loaded along the second direction, with the loaded pressure equal to the initial pressure. Afterwards, the pressure is released, and the flexible screen 10 is inspected. If the inspection result shows that the flexible screen 10 is not damaged, a new pressure is set, and the bending portion 200 is loaded again along the second direction, with the loaded pressure equal to the new pressure. Then, the pressure is released, and the flexible screen 10 is inspected again. If the inspection result shows that the flexible screen 10 is not damaged, the pressure is adjusted and loaded again… until, during a certain loading, the inspection result of the flexible screen 10 shows that it is damaged. The pressure value corresponding to this loading is recorded, and this pressure value is used as the second pressure F2.

[0087] In some embodiments, the force measuring device applies increasing pressure to the bending portion 200 times in successive increments. That is, the pressure value of the first application can be set to be relatively small, and the pressure values ​​used for subsequent applications increase sequentially. As a result, the obtained second pressure F2 can have a smaller deviation from the actual pressure that the bending portion 200 can withstand in the second direction, thereby improving the accuracy of the finally calculated ultimate pressure F.

[0088] In some embodiments, the force measuring device maintains pressure on the bent portion 200 for a preset duration. This helps to improve the reliability of the measurement results.

[0089] To better illustrate the above process, the following example demonstrates the process of applying pressure:

[0090] First, an initial pressure of 0.5 kgf is set on the force measuring device, along with a pressure increment of 0.5 kgf. Then, a first load is applied to the bent portion 200 along the second direction, with a load pressure of 0.5 kgf. After holding the pressure, it is released, and the flexible screen 10 is inspected. If the inspection result shows that the flexible screen 10 is not damaged, a new pressure of 1.0 kgf (the initial pressure of 0.5 kgf plus the pressure increment of 0.5 kgf) is set, and a second load is applied… This process is repeated until, after a certain load, the inspection result of the flexible screen 10 shows that it is damaged. By setting a lower initial pressure and gradually increasing the load pressure with each load, the obtained second pressure F2 can have a smaller deviation from the actual pressure that the bent portion 200 can withstand in the second direction, thereby improving the accuracy of the final calculated ultimate pressure F.

[0091] Optionally, to further improve the accuracy of the measurement results, multiple flexible screens 10 to be tested can be prepared, each flexible screen 10 being a product of the same specifications. Then, the second pressure F2 is measured for each flexible screen 10 according to the above process. Then, the average value or the maximum value of each second pressure F2 is taken and substituted into the formula for calculating the resultant force to obtain the ultimate pressure F. Wherein, if the purpose of evaluating the strength of the bending portion 200 of the flexible screen 10 is to evaluate the strength level of the current product, the average value of each second pressure F2 can be taken as the basis for calculating the ultimate pressure F. If the purpose of the evaluation is to provide designers with a reference for designing an improved product, the maximum value of each second pressure F2 can be taken as the basis for calculating the ultimate pressure F.

[0092] In some embodiments, the preset holding time is 10s to 15s.

[0093] During strength testing, both excessively short and excessively long pressure holding times will affect the reliability of the measurement results. Repeated experiments have shown that setting the preset holding time to 10-15 seconds yields more reliable measurement results. Specifically, during each pressure application to the bending section 200, timing begins when the applied pressure reaches the set pressure, and the pressure is released when the preset holding time (10-15 seconds) is reached. This avoids holding times that are too short or too long, thus ensuring the reliability of the measurement results.

[0094] In some embodiments, the step of applying pressure to the bend 200 includes:

[0095] The pressure head 210 is configured to approach the bend 200 at a moving speed not exceeding 5 mm / min to apply pressure.

[0096] In this embodiment, the pressure head 210 is configured to approach the bending portion 200 at a moving speed of no more than 5 mm / min to gradually apply pressure. This configuration ensures that the pressure head 210 contacts the bending portion 200 of the flexible screen 10 at an extremely slow speed, thereby preventing the pressure head 210 from generating impact energy when it contacts the flexible screen 10, which could damage the flexible screen 10.

[0097] In some embodiments, the pressure head 210 includes a pressure section made of rubber or silicone.

[0098] When loading the bending part 200, the pressure part of the pressure head 210 contacts the bending part 200. The pressure part is made of rubber or silicone. In this way, when the pressure head 210 contacts the flexible screen 10, the pressure part absorbs the energy generated during the contact process through elastic deformation, thereby further protecting the flexible screen 10 and preventing the flexible screen 10 from being damaged.

[0099] In some embodiments, the step of checking whether the flexible screen 10 is damaged after each pressurization includes:

[0100] Remove the flexible screen 10 from the force measuring device;

[0101] Turn on the flexible screen 10 and make the flexible screen 10 display the preset image;

[0102] When the flexible screen 10 exhibits abnormal brightness or image quality, it is determined that the flexible screen 10 has been damaged by pressure.

[0103] In this embodiment, whether the flexible screen 10 has been damaged by pressure can be determined by direct visual observation. Specifically, the flexible screen 10 can be illuminated and a preset image can be displayed. If the flexible screen 10 does not exhibit abnormal brightness or display abnormalities, it can be determined that the flexible screen 10 has not been damaged by pressure; if the flexible screen 10 exhibits abnormal brightness or display abnormalities, it can be determined that the flexible screen 10 has been damaged by pressure. This determination method is relatively simple and easy to implement, and using this method helps to improve testing efficiency.

[0104] In some embodiments, the step of checking whether the flexible screen 10 is damaged after each pressurization includes:

[0105] Remove the flexible screen 10 from the force measuring device;

[0106] The bent portion 200 of the flexible screen 10 was observed using a microscope;

[0107] When film peeling is observed at the bend 200, it is determined that the flexible screen 10 is damaged by pressure.

[0108] In this embodiment, the determination of whether the flexible screen 10 has been damaged by pressure can be made using a microscope. Specifically, the film layer of the bending portion 200 is observed under a microscope, and the presence or absence of film peeling is used as the criterion. If no film peeling is observed at the bending portion 200, it can be determined that the flexible screen 10 has not been damaged by pressure; if film peeling is observed at the bending portion 200, it can be determined that the flexible screen 10 has been damaged by pressure. This method of determination is more accurate.

[0109] In some embodiments, the step of checking whether the flexible screen 10 is damaged after each pressurization includes:

[0110] Remove the flexible screen 10 from the force measuring device;

[0111] Turn on the flexible screen 10 and make the flexible screen 10 display the preset image;

[0112] If the flexible screen 10 exhibits abnormal brightness or image quality, it is determined that the flexible screen 10 has been damaged by pressure.

[0113] If the flexible screen 10 does not exhibit abnormal brightness or image quality, the bent portion 200 of the flexible screen 10 is observed using a microscope. When film peeling is observed in the bent portion 200, it is determined that the flexible screen 10 has been damaged by pressure.

[0114] In this embodiment, the determination of whether the flexible screen 10 is damaged by pressure is first made by direct observation with the human eye, and then further determined by a microscope. That is, if abnormal brightness or image quality is observed in the flexible screen 10 with the human eye, it can be directly determined that the flexible screen 10 is damaged by pressure. If no abnormality is observed with the human eye, further observation with a microscope is required. If film peeling is observed at the bend 200 under the microscope, even if the brightness and image quality of the flexible screen 10 are normal when lit, it must still be determined that the flexible screen 10 is damaged by pressure. This is because even slight film separation may not have a significant impact on the display function of the flexible screen 10, but the structure of the flexible screen 10 has already been damaged to some extent. Therefore, combining direct observation with microscopic observation improves testing efficiency and ensures the accuracy of the determination.

[0115] Understandably, if abnormal brightness or image quality can be observed in the flexible screen 10 with the naked eye, it means that the applied pressure has exceeded the tolerance of the bent part. In this case, the applied pressure value can be reduced, the pressure can be applied again and held, and then observed with a microscope. This way, a more accurate "pressure value corresponding to the damage to the flexible screen" can be obtained.

[0116] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0117] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for evaluating the bending performance of a flexible screen, characterized in that, The evaluation method includes: providing a flexible screen, the flexible screen including a main body and a bent portion adjacent to the main body, the main body being the straight portion of the flexible screen, the bent portion including a first portion and a second portion, the first portion being the portion of the bent portion that connects to the main body, and the second portion being a portion different from the first portion; in a first direction, making the pressure head of a force measuring device parallel to the outer convex surface of the first portion, and applying pressure to the outer convex surface of the bent portion along the first direction using the pressure head, and obtaining the first pressure corresponding to when the flexible screen is damaged. The first direction is perpendicular to the main body; in the second direction, the pressure head is brought into parallel contact with the outer convex surface of the second part, and pressure is applied to the outer convex surface of the bent part along the second direction using the pressure head to obtain the second pressure corresponding to the time when the flexible screen is damaged. Wherein, the second direction is parallel to the main body; based on the first pressure and the second pressure The ultimate pressure F that causes the flexible screen to fail is calculated according to the following formula: 。 2. The method for evaluating the bending performance of a flexible screen according to claim 1, characterized in that, The step of applying pressure to the convex surface of the bent portion along the first direction includes: the length of the pressure head can cover the length of the first portion; and the length of the pressure head can cover the length of the second portion.

3. The method for evaluating the bending performance of a flexible screen according to claim 2, characterized in that, The length of the first part is equal to the length of the second part.

4. The method for evaluating the bending performance of a flexible screen according to claim 3, characterized in that, The length of the pressure head is 1 to 1.1 times the length of the first part.

5. The method for evaluating the bending performance of a flexible screen according to claim 3, characterized in that, The width of the pressure head is less than or equal to half the bending radius of the bent portion.

6. The method for evaluating the bending performance of a flexible screen according to claim 1, characterized in that, The pressure applied to the convex surface of the bent portion along the first direction is used to obtain the first pressure corresponding to the time when the flexible screen is damaged. The steps include: using a force measuring device to apply different pressure values ​​to the outward convex surface of the bent portion multiple times along the first direction; checking whether the flexible screen is damaged after each pressure application; and using the pressure value corresponding to the damage to the flexible screen as the first pressure. 。 7. The method for evaluating the bending performance of a flexible screen according to claim 6, characterized in that, The force measuring device maintains pressure on the bent portion for a preset duration.

8. The method for evaluating the bending performance of a flexible screen according to claim 7, characterized in that, The preset duration is 10s to 15s.

9. The method for evaluating the bending performance of a flexible screen according to claim 1, characterized in that, Apply pressure along the second direction to the outward convex surface of the bent portion to obtain the second pressure corresponding to the time when the flexible screen is damaged. The steps include: using a force measuring device to apply different pressure values ​​to the outward convex surface of the bent portion multiple times along the second direction; checking whether the flexible screen is damaged after each pressure application; and using the pressure value corresponding to the damage to the flexible screen as the second pressure. 。 10. The method for evaluating the bending performance of a flexible screen according to claim 9, characterized in that, The force measuring device maintains pressure on the bent portion for a preset duration.

11. The method for evaluating the bending performance of a flexible screen according to claim 10, characterized in that, The preset duration is 10s to 15s.

12. The method for evaluating the bending performance of a flexible screen according to any one of claims 6-11, characterized in that, The step of applying pressure to the convex surface of the bend includes: the pressure head is configured to move toward the bend at a moving speed not exceeding 5 mm / min to apply pressure.

13. The method for evaluating the bending performance of a flexible screen according to claim 12, characterized in that, The pressure head includes a pressure section made of rubber or silicone.

14. The method for evaluating the bending performance of a flexible screen according to any one of claims 6-11, characterized in that, The step of checking whether the flexible screen is damaged after each application of pressure includes: removing the flexible screen from the force measuring device; lighting up the flexible screen and displaying a preset image on the flexible screen; and determining that the flexible screen is damaged when the flexible screen shows abnormal brightness or abnormal image.

15. The method for evaluating the bending performance of a flexible screen according to any one of claims 6-11, characterized in that, The step of checking whether the flexible screen is damaged after each application of pressure includes: removing the flexible screen from the force measuring device; observing the bent portion of the flexible screen using a microscope; and determining that the flexible screen is damaged when film peeling is observed at the bent portion.

16. The method for evaluating the bending performance of a flexible screen according to any one of claims 6-11, characterized in that, The step of checking whether the flexible screen is damaged after each application of pressure includes: removing the flexible screen from the force measuring device; lighting up the flexible screen and displaying a preset image on the flexible screen; determining that the flexible screen is damaged if the flexible screen shows abnormal brightness or abnormal image; and observing the bent portion of the flexible screen with a microscope if the flexible screen does not show abnormal brightness or abnormal image, determining that the flexible screen is damaged when film peeling is observed in the bent portion.

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