Backlight and display screen adhesion testing apparatus and method

Abstract

The application discloses a backlight and display screen bonding force testing device and method, which is applied to bonding performance testing and comprises a base, a base arm and a support frame, the base arm and the support frame are arranged on the base, a magnetic force assembly is arranged on the base arm, the magnetic force assembly is magnetically connected with a metal fixture, the magnetic force assembly is electrically connected with a power supply, the base arm is further provided with a chuck, an impact column is arranged at the clamping end of the chuck, the support frame is provided with a testing assembly, a conduction force fixture is arranged below the testing assembly, the testing assembly is connected with the conduction force fixture through double-sided adhesive connection, and the bottom end of the impact column is in contact with the surface of the conduction force fixture. The device simulates the actual situation of collision to evaluate the impact resistance of the backlight and display screen module, better simulates the scene when the consumer uses the failure, and makes the data of the bonding performance of the black adhesive more real and reliable, so that more reliable theoretical data is provided as a basis for the research and development of the mobile phone screen.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of adhesion testing, in particular to a backlight and display screen adhesion testing device and method. BACKGROUND

[0002] The basic structure of a mobile phone display module is mainly composed of a display screen (cover plate, polarizing plate, LCD) and a backlight. The backlight is a component that provides light source for the display screen. The backlight and the display screen are bonded together through the black adhesive on the top layer of the backlight. Due to the trend of full-screen of mobile phones, the distance from the display screen viewing area to the edge of the housing is getting smaller and smaller, which means that the size of the black adhesive is getting smaller and smaller, resulting in frequent separation of the backlight and the display screen, thereby causing light leakage. Currently, the adhesion performance of the backlight and the display screen is mainly evaluated by using the pulling force method during the design stage of the display module. Double-sided adhesive is attached to the front of the display screen cover plate and the back of the backlight, respectively. Then, the two arms of the pulling device are pulled in opposite directions, and the pulling force when the backlight and the display screen are separated is recorded to evaluate the adhesion performance. However, this testing method is simple to operate, but the pulling force is gradually increased from zero. The actual use scenario of consumers is often the vibration impact when the mobile phone is accidentally dropped. The sudden concentrated impact force causes the display screen and the backlight to separate, so the experimental evaluation method cannot effectively evaluate the risk of consumer use.

[0003] Patent No. (CN207742082U) discloses a full-laminated screen adhesion testing device, which includes a base frame, a product positioning platform fixed to the base frame for positioning and placing the screen to be tested, a pulling head or a pressing head connected to the base frame through an xy translation mechanism and located above the product positioning platform, a pulling and pressing force sensor connected to the pulling head or the pressing head, and a mirror arranged on the side of the product positioning platform.

[0004] However, the inventor found the following defects when implementing this device: because the pulling force of the device is gradually increased from zero, the pulling force when the backlight and the display screen are separated is recorded to evaluate the adhesion performance, so the impact cannot be simulated according to the drop and collision that occurs in real life. The data of the adhesion performance of the black adhesive cannot be obtained whether it is real and effective, thereby making the adhesion testing inaccurate and meaningless. SUMMARY

[0005] Based on this, it is necessary to propose a test method for the adhesive performance of backlight and display screen under impact and vibration to address the aforementioned technical problems. After the magnetic core is energized, a small metal ball is fixed directly above the impact column. After the magnetic core is de-energized, the small metal ball impacts the impact column, thus transmitting the impact force to the iron plate. Since the iron plate is fixed to the mobile phone display module with double-sided adhesive, the impact force is transmitted to the backlight. By calculating the mass of the ball and the height of its fall, the magnitude of the impact force is calculated, thereby determining the adhesive state of the backlight and display screen. This device simulates a collision in actual situations to evaluate the adhesive impact resistance of the backlight and display module, better simulating the scenario of failure during consumer use. This makes the data on the adhesive performance of the black glue more realistic and reliable, providing a more reliable theoretical basis for the subsequent research and development of mobile phone screens.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A backlight and display screen adhesion testing device is used for adhesive performance testing.

[0008] It includes a base, a base arm, and a support frame, wherein the base arm and the support frame are both mounted on the base.

[0009] A magnetic component is installed on the base arm, and the magnetic component is magnetically connected to a metal fastener. The magnetic component is electrically connected to a power source. The base arm is also equipped with a chuck, and the clamping end of the chuck is equipped with an impact column. The support frame is equipped with a testing component.

[0010] A force-conducting fastener is disposed below the test component, and the test component and the force-conducting fastener are connected by double-sided adhesive.

[0011] The bottom end of the impact column contacts the surface of the force-conducting fastener.

[0012] In a preferred embodiment of the backlight and display screen adhesion testing device provided by the present invention, the line connecting the center of the metal fastener and the center of the impact column is in the same vertical direction and perpendicular to the surface of the force-conducting fastener.

[0013] 0 is a preferred embodiment of the backlight and display screen adhesion testing device provided by the present invention.

[0014] The metal fastener is a metal ball, and the force-conducting fastener is an iron block.

[0015] In a preferred embodiment of the backlight and display screen adhesion testing device provided by the present invention, the magnetic component includes a suction cup arm movably connected to the base arm, the suction cup arm being provided with a magnetic core, and the magnetic core being magnetically connected to the metal fastener.

[0016] 5As a preferred embodiment of the backlight and display screen adhesion testing device provided by the present application, the testing assembly is a mobile phone display module.

[0017] The top end of the impact column is flat, and the bottom end of the impact column is conical.

[0018] As a preferred embodiment of the backlight and display screen adhesion testing device provided by the present application, the testing assembly is a mobile phone display module.

[0019] As a preferred embodiment of the backlight and display screen adhesion testing device provided by the present application, the testing assembly is composed of a display module, black adhesive and a backlight module.

[0020] The display module includes a cover plate, a polarizing plate and an LCD.

[0021] As a preferred embodiment of the backlight and display screen adhesion testing device provided by the present application, the magnetic assembly and the chuck can be arranged at any position on the base arm, and the position of the chuck is below the position of the magnetic assembly.

[0022] 5As a preferred embodiment of the backlight and display screen adhesion testing device provided by the present application, the testing assembly is a mobile phone display module.

[0023] The base arm and the base are an integral structure.

[0024] The present application also provides a backlight and display screen adhesion testing method, which comprises the following steps:

[0025] Step 1: Place the support frame on the base, and the bottom of the testing assembly is connected with the conductive force fixture and placed on the support frame.

[0026] Step 2: Adjust the position of the chuck so that the round head of the impact column is in contact with the conductive force fixture.

[0027] Step 3: Adjust the position of the chuck so that the center of the magnetic core and the center of the impact column are in the same vertical direction.

[0028] Step 4: Turn on the power of the magnetic core, and place a metal fixture with a certain mass on the magnetic core.

[0029] Step 5: Turn off the power of the magnetic core, and the metal fixture freely falls and hits the impact column.

[0030] Step 6: Turn on the testing frame to light the module, and check whether the backlight and display screen module in the testing assembly are separated and have light leakage phenomenon.

[0031] Compared with the prior art, the present application has the following beneficial effects:

[0032] The present application provides a backlight and display screen adhesion test device and method. After the magnetic assembly is powered on, the metal fixture is fixed above the impact column. After the magnetic assembly is powered off, the metal fixture impacts the impact column, so that the impact force is transmitted to the transmission fixture. Since the transmission fixture and the test assembly are fixed by double-sided adhesive, the impact force is transmitted to the test assembly. The impact force is quantified by the mass of the metal fixture and the drop height H. When the mass of the metal fixture remains unchanged, the height H of the metal fixture is increased by one test unit after each test. Then the test is repeated until the backlight and display screen module in the test assembly are separated and light leakage occurs. The size of the impact force is calculated by a related physical formula to evaluate the level of adhesion impact resistance of the backlight and display screen module. The device simulates the way of collision that may occur in actual situations to evaluate the adhesion impact resistance of the backlight and display screen module. The impact force replaces the tensile force, eliminating the influence of non-objective factors caused by the tensile force on the test. The test assembly better simulates the scene when the consumer uses the failure, making the data of the adhesion performance of the test assembly more real and reliable, greatly improving the accuracy of the test, and providing more reliable theoretical data as a basis for the research and development of the mobile phone screen. BRIEF DESCRIPTION OF DRAWINGS

[0033] In order to more clearly illustrate the schemes in the present application, the following will briefly introduce the drawings needed in the embodiments. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0034] Figure 1 The structure diagram of the backlight and display screen adhesion test device provided by the present application is shown in the figure.

[0035] Figure 2 The partial schematic view A of Figure 1

[0036] Figure 3 The partial schematic view B of Figure 1

[0037] The mark description in the figure is as follows:

[0038] Base 1;

[0039] Base arm 2;

[0040] Support frame 3;

[0041] Magnetic assembly 4, suction cup arm 41, magnetic core 42;

[0042] Metal fixture 5; ​​

[0043] Chuck 6;

[0044] Impact column 7;

[0045] Test assembly 8, display screen module 81, black adhesive 82, backlight 83, cover plate 811, polarizer 812, LCD display screen 813;

[0046] Conductive force fixture 9;

[0047] Double-sided adhesive 10. DETAILED DESCRIPTION

[0048] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0049] As in the background art, the pulling force of most devices starts from zero and gradually increases slowly. The pulling force when the backlight 83 and the display screen module 81 are separated is recorded to evaluate the bonding performance, so it cannot simulate the impact according to the drop and collision in actual life, and it cannot obtain whether the data of the bonding performance of the black adhesive 82 is real and effective, thereby making the bonding force test inaccurate and meaningless.

[0050] In order to solve this technical problem, the present application provides a backlight and display screen bonding force test device and method, which is applied to bonding performance test.

[0051] Specifically, please refer to Figure 1 , which comprises a base 1, a base arm 2 and a support frame 3, the base arm 2 and the support frame 3 are arranged on the base 1, the base arm 2 is provided with a magnetic force assembly 4, the magnetic force assembly 4 is magnetically connected with a metal fixture 5, the magnetic force assembly 4 is electrically connected with a power supply, the base arm 2 is further provided with a chuck 6, the clamping end of the chuck 6 is provided with an impact column 7, the support frame 3 is provided with a test assembly 8, the lower part of the test assembly 8 is provided with a conductive force fixture 9, the test assembly 8 and the conductive force fixture 9 are connected through a double-sided adhesive 10, and the bottom end of the impact column 7 is in contact with the surface of the conductive force fixture 9.

[0052] The application provides a backlight and display screen bonding force testing device, the metal fixture 5 is fixed above the impact column 7 after the magnetic assembly 4 is powered on, the impact column 7 is impacted by the metal fixture 5 after the magnetic assembly 4 is powered off, so that the impact force is conducted to the conducting force fixture 9, since the conducting force fixture 9 and the testing assembly 8 are fixed by the double-sided adhesive 10, the impact force is conducted to the testing assembly 8, the quantity is determined by the mass of the metal fixture 5 and the drop height H, when the mass of the metal fixture 5 is unchanged, the height H of the metal fixture 5 is increased by one test unit after each test, and then the test is repeated until the backlight 83 and the display screen module 81 in the testing assembly 8 are separated and light leakage occurs, the size of the impact force is calculated by a relevant physical formula, so as to evaluate the impact resistance level of the backlight 83 and the display screen module 81, the device simulates the way of collision in the actual situation to evaluate the bonding impact resistance of the backlight 83 and the display screen module 81, the impact force is used to replace the pulling force, the influence of the pulling force on the test is eliminated, the scene when the consumer uses the failure is better simulated, the bonding performance data of the testing assembly 8 is more real and reliable, the accuracy of the test result is greatly improved, and more reliable theoretical data is provided as a basis for the research and development of the mobile phone screen.

[0053] In order for those skilled in the art to better understand the technical scheme of the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in combination with the drawings.

[0054] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0055] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0056] Embodiment 1

[0057] Please refer to Figure 1 With Figure 3 A backlight and display screen bonding force testing device, which comprises a base 1, a base arm 2 and a support frame 3, the base arm 2 and the support frame 3 are arranged on the base 1, the base arm 2 is provided with a magnetic assembly 4, the magnetic assembly 4 is magnetically connected with a metal fixture 5, the magnetic assembly 4 is electrically connected with a power supply, the base arm 2 is further provided with a chuck 6, the chucking end of the chuck 6 is provided with an impact column 7, the support frame 3 is provided with a testing assembly 8, the lower portion of the testing assembly 8 is provided with a conducting force fixture 9, the testing assembly 8 and the conducting force fixture 9 are connected by a double-sided adhesive 10, and the bottom end of the impact column 7 is in contact with the surface of the conducting force fixture 9.

[0058] Specifically, the center line of the metal fixture 5 and the impact column 7 is in the same vertical direction and perpendicular to the surface of the conductive force fixture 9.

[0059] Preferably, the metal fixture 5 is a metal ball, and the conductive force fixture 9 is an iron block.

[0060] Specifically, the magnetic force assembly 4 includes a suction arm 41 movably connected to the base arm 2, and the suction arm 41 is provided with a magnetic core 42 which is magnetically connected to the metal fixture 5.

[0061] Specifically, the magnetic force assembly 4 and the chuck 6 can be arranged at any position on the base arm 2, and the position of the chuck 6 is below the position of the magnetic force assembly 4.

[0062] Specifically, the base arm 2 and the base 1 are integrated.

[0063] Through the above structure design, the base 1 is used to fix the base arm 2 and the support frame 3, the upper end of the base arm 2 is fixed with the suction arm 41, the suction arm 41 is used to fix the magnetic core 42, the magnetic core 42 is electrically connected with the power supply, and the attraction force is started and ended through electric control, so as to suck the metal ball, the metal ball provides a certain impact force by its free fall, the lower end of the base arm 2 is installed with the chuck 6, the chuck 6 is used to fix the impact column 7, the impact column 7 is used to transmit the falling force of the metal ball to the iron block, the support frame 3 is used to place the clamping test assembly 8 to prevent it from sliding during the experiment, and the lower surface of the test assembly 8 is connected with the iron block through the double-sided adhesive 10, a part of the area of the iron block is connected with a part of the area of the test assembly 8, and the exposed part of the iron block is used to contact with the impact column 7. During the experiment, the ball freely falls and hits the impact column 7, the impact force of the impact column 7 is transmitted to the backlight 83 by the iron block, and the conduction of the impact force is realized.

[0064] The impact force is quantified by the mass and the falling height H of the metal fixture 5, when the mass of the metal fixture 5 is unchanged, the height H of the metal fixture 5 is increased by one test unit after each test, and then the test is repeated until the backlight 83 and the display screen module 81 in the test assembly 8 are separated and light leakage occurs. The size of the impact force is calculated by a related physical formula, so as to evaluate the level of the adhesive impact resistance of the backlight 83 and the display screen module 81. The device simulates the way of collision that may occur in actual situation to evaluate the adhesive impact resistance of the backlight 83 and the display screen module 81, uses the impact force instead of the pulling force, eliminates the influence of non-objective factors caused by the pulling force on the test, better simulates the scene when the consumer uses the failure, makes the data of the adhesive performance of the test assembly 8 more real and reliable, greatly improves the accuracy of the test, and provides more reliable theoretical data as a basis for the research and development of the mobile phone screen.

[0065] Embodiment 2

[0066] The backlight and display screen adhesion test device provided in Example 1 is further optimized, specifically, as shown in Figure 1 As shown in Figure 3 The top end of the impact column 7 is flat, and the bottom end of the impact column 7 is conical.

[0067] Through the above structural design, the impact column 7 is used to transmit the falling force of the metal ball to the iron block, which is more conducive to the conduction of impact force and helps to simulate the scene when the user uses the failure, so that the data of the adhesion performance of the test assembly 8 is more true and reliable.

[0068] Example 3

[0069] The backlight and display screen adhesion test device provided in Example 1 or 2 is further optimized, as shown in Figure 2 The test assembly 8 includes a display screen module 81, black glue 82 and backlight 83, and the display screen module 81 includes a cover plate 811, a polarizer 812 and an LCD display screen 813.

[0070] The test assembly 8 is composed of the display screen module 81 (composed of the cover plate 811, the polarizer 812 and the LCD display screen 813) and the backlight 83, and the backlight 83 is a component that provides light source for the display screen. The backlight 83 and the display screen module 81 are bonded together through the annular black glue 82 on the outer edge of the uppermost layer of the backlight 83.

[0071] Example 4

[0072] A backlight and display screen adhesion test method, comprising the following steps:

[0073] Step 1: Place the support frame 3 on the base 1, and the bottom of the test assembly 8 is connected with the conductive force fixture 9 and the test assembly 8 is placed on the support frame 3. In this method, the conductive force fixture 9 is an iron block, but according to different situations, other materials can be used instead of the iron block; the lower surface of the test assembly 8 is connected with the iron block by the double-sided adhesive 10, a part of the area of the iron block is connected with a part of the area of the test assembly 8, and the exposed part of the iron block is used to contact with the impact column 7.

[0074] Step 2: Adjust the position of the chuck 6 so that the round head of the impact column 7 is in contact with the conductive force fixture 9. The position of the chuck 6 is fixed in order to cooperate with the impact column 7 contacting the surface of the iron block.

[0075] Step 3: Adjust the position of the suction cup arm 41 so that the center of the magnetic core 42 and the center of the impact column 7 are in the same vertical direction.

[0076] Step 4: Turn on the power of the magnetic core 42, and place a certain mass of metal fastener 5 on the magnetic core 42. In this method, the metal fastener 5 is a metal ball, but according to different situations, it can also be replaced by other materials instead of metal balls.

[0077] Step 5: Turn off the power of the magnetic core 42, and the metal fastener 5 freely falls and hits the impact column 7.

[0078] Step 6: Use the test stand to light the module to check whether the backlight 83 and the display module 81 in the test assembly 8 are separated and have light leakage phenomenon. The mass and the falling height H of the metal fastener 5 are quantified, and when the mass of the metal fastener 5 is unchanged, the height H of the metal fastener 5 is increased by one test unit after each test is passed, and then the test is repeated until the backlight 83 and the display module 81 in the test assembly 8 are separated and have light leakage phenomenon. The size of the impact force is calculated by a related physical formula, so as to evaluate the level of adhesive impact resistance of the backlight 83 and the display module 81.

[0079] In the present application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0080] Obviously, the above-described embodiments are only a part of the embodiments of the present application, and are not all the embodiments. The preferred embodiments of the present application are given in the drawings, but do not limit the patent scope of the present application. The present application can be realized in many different forms, and conversely, the purpose of providing these embodiments is to make the disclosure of the present application more thorough and comprehensive. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features. Any equivalent structure made by using the contents of the present application specification and drawings, directly or indirectly applied to other related technical fields, is also within the patent protection scope of the present application.

Claims

1. A backlight and display panel adhesion test device applied to a bonding performance test, characterized by, It includes base (1), base arm (2) and support frame (3), base arm (2) and the support frame (3) are arranged on the base (1), the base arm (2) is provided with magnetic force component (4), the magnetic force component (4) is magnetically connected with metal fixture (5), the magnetic force component (4) is electrically connected with power supply, the base arm (2) is also provided with chuck (6), the clamping end of chuck (6) is provided with impact column (7), the support frame (3) is provided with test component (8), the lower portion of test component (8) is provided with conducting force fixture (9), test component (8) and conducting force fixture (9) are connected through double-sided adhesive (10), the bottom end of impact column (7) is in contact with the surface of conducting force fixture (9), the center line of metal fixture (5) and impact column (7) is in the same vertical direction and perpendicular to the surface of conducting force fixture (9), the magnetic force component (4) includes suction cup arm (41) arranged on the base arm (2), the suction cup arm (41) is provided with magnetic core (42), the magnetic core (42) is magnetically connected with the metal fixture (5), the test component (8) is a mobile phone display module, the test component (8) includes display screen module (81), black rubber (82) and backlight (83), the display screen module (81) includes cover plate (811), polarizer (812) and LCD display screen (813).

2. The device of claim 1, wherein, The metal fixture (5) is a metal ball, and the conducting force fixture (9) is an iron block.

3. The device of claim 1, wherein the device is a backlight and display adhesion test device. The top end of the impact column (7) is a plane, and the bottom end of the impact column (7) is in the shape of a cone.

4. The device of claim 1, wherein the device is a backlight and display adhesion test device. The magnetic force component (4) and the chuck (6) can be arranged at any position on the base arm (2), and the position of the chuck (6) is below the position of the magnetic force component (4).

5. The device of claim 1, wherein the device is a backlight and display adhesion test device. The base arm (2) and the base (1) are an integral structure.

6. A method of testing the adhesion of a backlight and display, characterized by, It is used for the backlight and display screen adhesion test device of any one of claims 1-5, comprising the following steps: Step 1: place the support frame (3) on the base (1), the bottom of the test component (8) is in contact with the conducting force fixture (9), and the test component (8) is placed on the support frame (3); Step 2: adjust the position of the chuck (6) so that the round head of the impact column (7) is in contact with the conducting force fixture (9); Step 3: adjust the position of the suction cup arm (41) so that the center of the magnetic core (42) and the center of the impact column (7) are in the same vertical direction; Step 4: turn on the power of the magnetic core (42), and place a certain mass of metal fixture (5) on the magnetic core (42); Step 5: turn off the power of the magnetic core (42), the metal fixture (5) falls freely and hits the impact column (7); Step 6: use the test frame to light the module to check whether the backlight (83) and the display screen module (81) in the test component (8) are separated and have light leakage phenomenon.

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