Bending test equipment and method for OLED screen

Abstract

The present invention provides a bending test device and a test method for an OLED screen, comprising a cabinet and a bending mechanism, wherein the bending mechanism comprises a moving device, a placing platform, a bending device and a tension sensing device, wherein the placing platform comprises a first platform and a second platform, which are used to fix the two ends of the OLED flexible screen, wherein a moving device, a bending device and a tension sensing device are arranged between the first platform and the second platform, wherein the bending device is fixed on the moving device, wherein the bending device comprises a bending roller, wherein the tension sensing device comprises a tension sensor, a tension control shaft and an angle control shaft, wherein the angle control shaft is located below the bending roller and on one side of the tension control shaft, wherein the two ends of the tension control shaft are connected to the tension sensor and fixed on the moving device to achieve left and right movement. The present invention provides a bending test device and a test method for an OLED screen, wherein the bending test efficiency is higher, the experimental results are more stable and objective, the displacement accuracy is high, and the versatility is strong.

Description

Technical Field

[0001] The present invention relates to the technical field of OLED screen testing, and in particular to a bending test device and a test method for an OLED screen. Background Art

[0002] Liquid crystal display technology has transformed from LCD hard screen to OLED flexible screen. The popularity of OLED flexible screen is not only due to low power consumption and high display effect, but also the greater revolutionary improvement is flexibility, which has changed the fundamental view of human beings on display screens. It is no longer a flat display, but a flexible display at all angles and in all directions. In the early stage of the development of flexible display, the collection of various physical parameters after bending is of great help to the entire product cognition and subsequent improvement.

[0003] However, at present, there are very limited devices that can support the flexible bending of OLED flexible screens, and the market is basically blank. Most of them are manual tools that need to be maintained and verified by manpower. There are various problems, such as the inability to shape the bent surface, insufficient shaping accuracy of the bent surface, inability to maintain the bending effect, and unstable repeatability (reproducibility) of the bending effect. The folding screen test device recently released by Samsung can test OLED flexible screens, but the device is a whole-machine bending test and can only test the 180-degree bending life of the OLED flexible screen. The test range is very limited and its versatility is not strong. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and to provide a bending test device and a testing method for an OLED screen, which has higher bending test efficiency, more stable and objective experimental results, high displacement accuracy and strong versatility.

[0005] To achieve the above-mentioned purpose, the present invention proposes a bending test equipment for an OLED screen, comprising a cabinet and a bending mechanism, the bending mechanism comprising a moving device, a placing platform, a bending device and a tension sensing device, the placing platform comprising platform one and platform two, which are used to fix the two ends of the OLED flexible screen, a moving device, a bending device and a tension sensing device are arranged between platform one and platform two, the bending device is fixed on the moving device to achieve up and down and left and right movement, the bending device comprises a bending roller, the tension sensing device comprises a tension sensor, a tension control shaft and an angle control shaft, the angle control shaft is located below the bending roller and on one side of the tension control shaft, the two ends of the tension control shaft are connected to the tension sensor, the tension sensing device and platform two are fixed on the moving device to achieve left and right movement.

[0006] The innovations of this technology are mainly reflected in the following aspects: it changes the traditional shortcomings of only being able to test a single bending angle and having poor versatility. This technical solution takes into account that the limiting factor for the future development of OLED flexible screens is the lack of understanding of their service life after multi-angle bending, which limits the further development of OLED flexible screens. Therefore, a mobile device is set up, and through the coordination and cooperation between the carrier, the bending device, the tension sensor and the mobile device, the bending device can move up and down, left and right, and the tension sensor can move left and right, thereby realizing continuous multi-angle bending and testing of the OLED flexible screen, with stable testing and good testing effects. At the same time, the setting of the carrier can cover both sides of the OLED screen with a carrying film, so that it will not be damaged when it is bent under force, and there is no need to affect the product due to clamping, nor is the bending point of the screen limited. The size test range is also improved, and the versatility is strong.

[0007] Preferably, the moving device includes multiple moving components, namely longitudinal moving components on both sides, transverse moving component one and transverse moving component two on both sides. The bending device is fixed between the longitudinal moving components on both sides. The longitudinal moving component can be moved left and right and is arranged on the transverse moving component one. The tension sensing device and the carrier two are integrally arranged and fixed on the transverse moving device to realize left and right movement.

[0008] In order to realize the up and down, left and right movement of the bending device and the left and right movement of the tension sensing device, the moving components are arranged as longitudinal moving components on both sides and lateral moving components one and two on both sides. Such a setting has a stable structure and is convenient for the mutual coordination between the moving components. In order to coordinate the movement of the tension sensing device, the carrier two and the tension sensing device are arranged as one. On the one hand, the structure is stable and convenient for the positioning of the OLED. On the other hand, it is conducive to the stable test of the tension and the test effect is good.

[0009] Preferably, the moving assembly includes a servo motor, a sliding screw and a slider, the slider is connected to the servo motor through the sliding screw to achieve movement, and the longitudinal moving assembly, the bending device, and the tension sensing device are fixedly connected to the corresponding sliders respectively. Compared with ordinary motors, this solution uses a servo motor to control the movement of each component, which has high precision and reproducibility, and the experimental parameters are more reference-oriented. Combined with the tension sensor, the trajectory of the servo motor is feedback-controlled according to the change of tension, the tension of the OLED flexible screen is more stable, and the life test is more accurate.

[0010] Preferably, a clamping assembly is provided on the placement platform, and the clamping assembly includes a movable cover plate and a clamping block. The fixed end of the movable cover plate can be rotatably fixed on the placement platform, the clamping block is located on the placement platform and is clamped with the movable end of the movable cover plate. The abutting surface of the clamping block is an inclined surface, and a clamping groove is provided below the abutting surface. The front end of the movable cover plate moves downward along the abutting surface and is clamped with the clamping groove. The OLED screen is loaded and removed by the mutual cooperation of the movable cover plate and the clamping block. In order to minimize the damage to the OLED screen caused by the loading, in addition to the bearing film covering both sides of the OLED screen, a downward oblique abutting surface is also provided at one end of the clamping block. In this way, the force when the movable cover plate is clamped with the clamping block can be alleviated, the impact on the OLED screen can be reduced, and the OLED screen can be protected.

[0011] Preferably, the carrier 1 is further provided with a bending assembly, the bending assembly includes an upper bending plate and a lower bending plate, the upper bending plate and the lower bending plate are both provided with an elliptical hole, the carrier 1 is provided with a bending groove, the upper bending plate and the lower bending plate are connected to the bending groove through the elliptical hole after overlapping, and a bending surface is provided on one side of the lower bending plate, and the bending surface extends outward from the outside of the bending groove. Such a setting can provide a certain degree of guidance for the OLED flexible screen after pressure loading, and can accurately adjust the degree of compression of the OLED flexible screen, while protecting the OLED flexible screen from certain damage due to different bending angles when testing various bending angles.

[0012] Preferably, the bending device further comprises a fixed plate and a connecting rod, connecting rods are provided on both sides of the fixed plate, both ends of the bending roller are connected to the connecting rods, and two bending rollers are provided, namely bending roller one and bending roller two, and bending roller one and bending roller two are respectively connected to the connecting rods. If there is one bending roller, the bending angle of the OLED flexible screen is very limited, generally 0-80 degrees or 80 degrees-180 degrees. In order to expand the test of the bending angle of the OLED flexible screen, the bending test angle of the OLED flexible screen is expanded to 0-180 degrees. Therefore, the number of bending rollers is set to two. At 0-80 degrees, the bending roller two exerts force to force the carrier film to bend, and at 80-180 degrees, the bending roller one exerts force to force the carrier film to bend, thereby expanding the bending test angle.

[0013] Preferably, the angle control axis is provided with two, namely angle control axis 1 and angle control axis 2, and the height of angle control axis 1 is lower than that of angle control axis 2. By providing two angle control axes and coordinating with the bending roller, the stability of the OLED flexible screen during multi-angle bending and the accuracy during testing are achieved.

[0014] A bending test method for an OLED screen comprises the following steps:

[0015] (1) Position fixation: Cover the two sides of the OLED flexible screen with a carrier film, place one end on the first stage, and place the other end on the second stage after passing through the bending roller of the bending device, the angle control shaft of the tension sensing device, and the tension control shaft, and fix it by clamping the clamping assembly;

[0016] (2) Bending angle test: Turn on the moving device, and through the cooperation of the photoelectric switch, drive the bending roller to move up and down and left and right in an orderly manner, and the tension sensing device to move left and right in an orderly manner, so as to achieve multi-angle bending of the OLED flexible screen from 0 to 180 degrees. After bending in place, the tension sensor of the tension sensing device tests the bending angle of the OLED flexible screen;

[0017] (3) Back off: The OLED flexible screen is bent to 180 degrees, the tension sensor test is completed, and the mobile device returns to the origin;

[0018] (4) Cycle test: Repeat steps (2) and (3) several times until the test is completed;

[0019] (5) End of test: Turn off the mobile device, open the clamping assembly, and take out the OLED flexible screen covered with the carrier film.

[0020] The innovation of this technical solution is that: the present invention utilizes the coordinated action of the mobile device and the photoelectric switch to drive the orderly movement of the bending roller and the tension sensor device, thereby realizing the multi-angle bending test of the OLED flexible screen from 0-180 degrees, changing the traditional disadvantage of only being able to test a single bending angle and having poor versatility; the present invention utilizes a carrier film to allow the OLED screen to be bent under force without damaging the OLED screen, and does not need to affect the product due to clamping, nor does it limit the bending point of the screen; the bending radius is replaced by replacing the bending curvature radius, and the versatility is strong; the use of a universal carrier film allows the equipment to be compatible with 5"~20" OLED screens for bending experiments, thereby realizing multi-angle bending life tests on OLED screens, filling the market gap in multi-angle bending life tests on OLED screens, and having strong practicality.

[0021] Preferably, the moving device includes a plurality of moving components, namely longitudinal moving components on both sides, transverse moving components one and transverse moving components two on both sides, each of the moving components includes a servo motor, a sliding screw and a slider, the slider is connected to the servo motor through the sliding screw to achieve movement, the two ends of the bending device are connected to the slider of the longitudinal moving component, the longitudinal moving component is connected to the slider of the transverse moving component one, driving the bending device to move up and down and left and right, the tension sensor device and the carrier two are integrally arranged, and connected to the slider on the transverse moving component two to achieve left and right movement. Such a setting structure is stable and convenient for the mutual coordination setting between the moving components. In order to coordinate the movement of the tension sensor device, the carrier two and the tension sensor device are set as one body. On the one hand, the structure is stable and convenient for the positioning of the OLED, and on the other hand, it is conducive to the stable test of tension and the test effect is good.

[0022] Preferably, the bending test angle of the OLED flexible screen in step (2) is 30°, 90°, 120°, and 180°, and the pause time after the bending test angle is in place is 10-12 seconds. Selecting bending angles of 30°, 90°, 120°, and 180° to test the life of the OLED flexible screen is representative, and pausing for 10-12 seconds improves the efficiency of the bending test, and the experimental results are more stable and objective, with fewer interference factors from the outside, high displacement accuracy, and strong versatility.

[0023] The beneficial effects of the present invention are as follows: the present invention can perform bending life tests on OLED screens at multiple angles, the bending test efficiency is higher, the experimental results are more stable and objective, there are fewer interference factors from the outside world, the equipment is stable, the displacement accuracy is high, the input-output ratio is high, and it has strong versatility and is compatible with a large span of OLED screen sizes, and is compatible with 5"~20" OLED screens for bending tests.

[0024] The features and advantages of the present invention will be described in detail through embodiments in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the present invention.

[0026] Figure 2 It is a schematic diagram of the structure of carrier one.

[0027] Figure 3 This is a schematic diagram of a large explosion structure of the carrier.

[0028] Figure 4 It is a structural schematic diagram of the tension sensing device.

[0029] Figure 5 It is a structural schematic diagram of the bending device.

[0030] Figure 6It is a schematic diagram of the structure of the present invention when it is bent to 30 degrees.

[0031] Figure 7 It is a schematic diagram of the structure of the present invention when it is bent to 90 degrees.

[0032] Figure 8 It is a schematic diagram of the structure of the present invention when it is bent to 120 degrees.

[0033] Fig. 9 It is a schematic diagram of the structure of the present invention when it is bent to 180 degrees.

[0034] In the figure: 1-cabinet, 2-carrier placement, 3-moving device, 4-bending device, 5-tension sensing device, 6-clamping assembly, 7-bending assembly, 21-carrier one, 22-carrier two, 23-front fixed plate, 24-rear fixed plate, 31-longitudinal moving assembly, 32-lateral moving assembly one, 33-lateral moving assembly two, 34-servo motor, 35-sliding screw, 36-slider, 41-bending roller, 42-fixed plate, 43-connecting rod, 51-tension sensor, 52-tension control shaft, 53-angle control shaft, 54-base, 61-movable cover, 62-block, 71-upper bending plate, 72-lower bending plate, 211-bending groove, 541-mounting plate, 621-slot, 721-bending surface. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0036] like Figures 1 to 9 As shown, the present embodiment proposes a bending test device for an OLED screen, comprising a cabinet 1 and a bending mechanism, the bending mechanism comprising a placing platform 2, a moving device 3, a bending device 4 and a tension sensing device 5, the placing platform 2 comprising a platform 1 21 and a platform 2 22, a clamping assembly 6 is provided on the placing platform 2, the clamping assembly 6 comprises a movable cover plate 61 and a clamping block 62, a front fixing plate 23 and a rear fixing plate 24 are provided on the placing platform 2, the fixed end of the movable cover plate 61 is movably connected to the rear fixing plate 24 through a pin shaft, the clamping block 62 is connected to the front fixing plate 23 through bolts, and is clamped with the movable end of the movable cover plate 61, the abutting surface of the clamping block 62 is an inclined surface, and a clamping groove 621 is provided below the abutting surface, the front end of the movable cover plate 61 moves downward along the abutting surface and is clamped with the clamping groove 621, the OLED flexible screen is located under the movable cover plate 61, and the two ends of the OLED flexible screen are fixed by clamping the movable cover plate 61 with the clamping groove 621,

[0037] A bending assembly 7 is also provided on the carrier 21, and the bending assembly 7 includes an upper bending plate 71 and a lower bending plate 72. The upper bending plate 71 and the lower bending plate 72 are both provided with elliptical holes. A bending groove 211 is provided on the carrier 21. After the upper bending plate 71 and the lower bending plate 72 overlap, they are connected to the bending groove 211 through the elliptical hole. A bending surface 721 is provided on one side of the lower bending plate 72. The bending surface 721 extends outward from the outside of the bending groove 211, providing a certain guidance for the OLED flexible screen after being loaded, accurately adjusting the compression degree of the OLED flexible screen, and protecting the OLED flexible screen from certain damage due to different bending angles.

[0038] A moving device 3, a bending device 4 and a tension sensor 5 are provided between the first platform 21 and the second platform 22. The moving device 3 includes a plurality of moving components, namely, longitudinal moving components 31 on both sides, transverse moving components 1 32 on both sides and transverse moving components 2 33. Each moving component includes a servo motor 34, a sliding screw 35 and a slider 36. The slider 36 is connected to the servo motor 34 through the sliding screw 35 to realize movement. Both ends of the bending device 4 are connected to the slider 36 of the longitudinal moving component 31. The longitudinal moving component 31 is connected to the transverse moving component 1 32. The slider 36 is connected to drive the bending device 4 to move up and down and left and right. The tension sensing device 5 and the carrier 2 22 are integrally arranged and connected to the slider 36 on the lateral moving component 2 33 to realize left and right movement. The bending device 4 includes a bending roller 41, a fixed plate 42 and a connecting rod 43. A connecting rod 43 is provided at one end of both sides of the fixed plate 42, and the other end is connected to the slider 36 of the longitudinal moving component 31. There are two bending rollers 41, namely bending roller one and bending roller two. Bending roller one and bending roller two are respectively connected to the connecting rod 43 to expand the range of the bending test angle.

[0039] The tension sensing device 5 includes a tension sensor 51, a tension control shaft 52, an angle control shaft 53 and a base 54. Mounting plates 541 are vertically provided on both sides of the base 54. An angle control shaft 53 and a tension control shaft 52 are provided between the two mounting plates 541. The angle control shaft 53 is located below the bending roller 41 and on one side of the tension control shaft 52. Both ends of the tension control shaft 52 are connected to the tension sensor 51. The tension sensing device 5 and the platform 2 22 are fixed on the lateral moving component 2 33 to achieve left and right movement. The angle control shaft 53 is set to two, namely angle control shaft one and angle control shaft two. The height of angle control shaft one is lower than that of angle control shaft two.

[0040] A bending test method for an OLED screen comprises the following steps:

[0041] (1) Position fixation: Cover the two sides of the OLED flexible screen with a carrier film, place one end on the first stage 21, and place the other end on the second stage 22 after passing through the bending roller of the bending device 4, the angle control shaft 53 and the tension control shaft 52 of the tension sensing device 5, and then clamp and fix it by the clamping assembly 6;

[0042] (2) Bending angle test phase 1: Turn on the servo motors 34 of each moving component. The servo motors 34 and the photoelectric switches cooperate with the controller. The longitudinal moving components 31 on both sides move upward synchronously, and the transverse moving component 1 32 moves to the left until the bending angle of the OLED screen is 30 degrees. The transverse moving component 2 33 moves to the left to ensure that the OLED screen is in a tensioned state. The three groups of moving devices 3 all pause for 10 seconds, and the tension sensor 51 tests the tension of this bending angle.

[0043] (3) Bending angle test phase II: the longitudinal moving components 31 on both sides move upward synchronously, and the transverse moving component 1 32 moves rightward until the bending angle of the OLED screen is 90 degrees. Then, the transverse moving component 2 33 moves rightward to ensure that the OLED screen is in a tensioned state. The three groups of moving components all pause for 10 seconds, and the tension sensor 51 tests the tension of this bending angle.

[0044] (4) Bending angle test phase 3: repeat the above step (3), when the bending angle of the OLED screen reaches 120 degrees and 180 degrees respectively, the three groups of moving components are paused for 10 seconds, and the tension sensor 51 tests the tension of the bending angle respectively;

[0045] (5) Retraction: After each bending angle test is completed, the mobile device 3 retracts to the origin;

[0046] (6) Cyclic test: the data measured by the tension sensor 51 is recorded in the controller, and the trajectory of the servo motor 34 is feedback-controlled according to the change of the tension, and then the above steps (2) to (5) are repeated to perform a bending life test on the OLED flexible screen;

[0047] (7) End of the test: turn off the servo motors 34 of each moving component, open the clamping component 6, and take out the OLED flexible screen covered with the carrier film.

[0048] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A bending test device for an OLED screen, characterized in that: It includes a cabinet and a bending mechanism, the bending mechanism includes a moving device, a placing platform, a bending device and a tension sensing device, the placing platform includes a platform 1 and a platform 2, which are used to fix the two ends of the OLED flexible screen, a moving device, a bending device and a tension sensing device are arranged between the platform 1 and the platform 2, the bending device is fixed on the moving device to achieve up and down, left and right movement, the bending device includes a bending roller, the tension sensing device includes a tension sensor, a tension control shaft and an angle control shaft, the angle control shaft is located below the bending roller and on one side of the tension control shaft, the two ends of the tension control shaft are connected to the tension sensor, the tension sensing device and the platform 2 are fixed on the moving device to achieve left and right movement; The moving device includes a plurality of moving components, namely longitudinal moving components on both sides, transverse moving components one and two on both sides, the bending device is fixed between the longitudinal moving components on both sides, the longitudinal moving components can be moved left and right and are arranged on the transverse moving component one, the tension sensor device and the carrier two are arranged in an integrated manner and are fixed on the transverse moving component two to realize left and right movement; The placing platform is provided with a clamping assembly, and the clamping assembly includes a movable cover plate and a clamping block. The fixed end of the movable cover plate can be rotatably fixed on the placing platform. The clamping block is located on the placing platform and is clamped with the movable end of the movable cover plate. The abutting surface of the clamping block is an inclined surface, and a clamping groove is provided below the abutting surface. After the front end of the movable cover plate moves downward along the abutting surface, it is clamped with the clamping groove. The first carrier is also provided with a bending assembly, the bending assembly includes an upper bending plate and a lower bending plate, the upper bending plate and the lower bending plate are both provided with an elliptical hole, the first carrier is provided with a bending groove, the upper bending plate and the lower bending plate are overlapped and connected to the bending groove through the elliptical hole, one side of the lower bending plate is provided with a bending surface, and the bending surface extends outward from the outer side of the bending groove; The bending device also includes a fixed plate and a connecting rod. Connecting rods are provided on both sides of the fixed plate. Both ends of the bending roller are connected to the connecting rods. There are two bending rollers, namely bending roller one and bending roller two. The bending roller one and bending roller two are respectively connected to the connecting rods.

2. The bending test device for an OLED screen according to claim 1, characterized in that: The moving assembly includes a servo motor, a sliding screw and a slider. The slider is connected to the servo motor via the sliding screw to achieve movement. The longitudinal moving assembly, the bending device and the tension sensor are respectively fixedly connected to the corresponding sliders.

3. The bending test device for an OLED screen according to claim 1, characterized in that: There are two angle control axes, namely angle control axis 1 and angle control axis 2. The height of angle control axis 1 is lower than that of angle control axis 2.

4. A method for testing the bending of an OLED screen using the OLED screen bending test device of claim 1, characterized in that: The following steps are included: Position fixation: Cover the two sides of the OLED flexible screen with a carrier film, place one end on the first stage, and place the other end on the second stage after passing through the bending roller of the bending device, the angle control shaft of the tension sensing device, and the tension control shaft, and fix it by clamping the clamping assembly; Bending angle test: Turn on the servo motors of each moving component to drive the bending roller to move up and down and left and right, and the tension sensor device to move left and right, so as to achieve multi-angle bending of the OLED flexible screen from 0 to 180 degrees. After bending in place, the tension sensor of the tension sensor device tests the bending angle of the OLED flexible screen; Back off: The OLED flexible screen is bent to 180 degrees, the tension sensor test is completed, and each moving component returns to the origin; Cyclic test: Repeat the above steps (2) and (3) to perform a bending life test on the OLED flexible screen; End of the test: turn off the servo motors of each moving component, open the clamping component, and take out the OLED flexible screen covered with the carrier film.

5. The bending test method of the OLED screen according to claim 4, characterized in that: The moving device includes multiple moving components, namely longitudinal moving components on both sides, transverse moving components one and transverse moving components two on both sides, each of the moving components includes a servo motor, a sliding screw and a slider, the slider is connected to the servo motor through the sliding screw to achieve movement, the two ends of the bending device are connected to the slider of the longitudinal moving component, the longitudinal moving component is connected to the slider of the transverse moving component one, driving the bending device to move up and down and left and right, the tension sensor device and the carrier two are integrally arranged, and are connected to the slider on the transverse moving component two to achieve left and right movement.

6. The bending test method of the OLED screen according to claim 4, characterized in that: In the step (2), the bending test angles of the OLED flexible screen are 30°, 90°, 120°, and 180°, and the pause time after the bending test angle is in place is 10-12 seconds.

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