Test method for evaluating separation resistance of shading glue of display module

Abstract

The invention discloses a test method for evaluating the separation resistance of shading glue of a display module, which comprises the following steps: attaching the shading glue to be tested to a shading glue carrier to form a shading glue sample to be tested; the method comprises the following steps: in a standard state, attaching a shading glue to-be-tested sample to an adhered body to form a to-be-tested piece, and standing for a first preset time; the to-be-tested piece is installed in the inner cavity of the evaluation jig, so that the to-be-tested piece deforms in the inner cavity of the evaluation jig; placing the evaluation jig provided with the to-be-tested piece in a preset environment, and standing for a second preset time; in a deformation state of the to-be-tested piece, the shading glue carrier is used for driving the to-be-tested shading glue to be separated from the adhered body in a floating manner; and measuring the floating distance H of the to-be-tested shading glue relative to the adhered body so as to evaluate the separation resistance of the to-be-tested shading glue. Therefore, the shading glue with proper viscosity can be selected in the project design stage of the display module, so that the shading glue can pass the environmental reliability test of the display module.

Description

Technical Field

[0001] The present invention relates to the technical field of display module production, and in particular to a testing method for evaluating the anti-separation capability of a light-shielding glue of a display module. Background Art

[0002] As people pursue full screen, the border of display module is gradually narrowed, which will cause the length of light shielding glue in display module to become narrower and narrower. Figure 1 As shown, the light-shielding glue 20 is used for shading the display module, and is pasted between the display screen 30 and the backlight module 40, and is located in the frame area of ​​the display module. However, as the length dimension of the light-shielding glue 20 becomes narrower and narrower as the frame becomes narrower, it means that the bonding area between the display screen 30 and the backlight module 40 becomes smaller and smaller. During the environmental reliability test of the display module, due to the thermal expansion and contraction deformation of the metal frame 41 of the backlight module, the surface characteristics of the polarizer change, and the presence of water vapor infiltration and other influencing factors, the viscosity of the light-shielding glue 20 and the polarizer 31 changes. As the metal frame 41 of the backlight module expands and contracts, the light-shielding glue 20 and the polarizer 31 are more likely to separate, which will cause the display module to fail the environmental reliability test, reducing the production quality of the display module.

[0003] In view of the above, a test method for evaluating the anti-separation ability of the light-shielding glue of the display module is proposed. Summary of the invention

[0004] The purpose of the present invention is to overcome at least one of the shortcomings of the prior art and to provide a test method for evaluating the anti-separation ability of the display module shading glue, so as to facilitate the selection of shading glue with appropriate viscosity during the display module project design stage, so that the shading glue can pass the environmental reliability test of the display module.

[0005] The objective of the present invention is achieved through the following technical solutions:

[0006] A test method for evaluating the anti-separation ability of a display module shading glue, comprising:

[0007] Attaching the light-shielding adhesive to be tested to the light-shielding adhesive carrier to form a light-shielding adhesive sample to be tested;

[0008] Under standard conditions, a light-shielding adhesive sample to be tested is attached to an adherend to form a test piece, and the piece is left to stand for a first preset time;

[0009] Installing the test piece into the inner cavity of an evaluation jig so that the test piece is deformed in the inner cavity of the evaluation jig;

[0010] Placing the evaluation fixture with the test piece installed thereon in a preset environment and leaving it to stand for a second preset time;

[0011] When the tested object is in a deformed state, the light-shielding adhesive carrier is used to drive the tested light-shielding adhesive to float and separate from the adherend;

[0012] The floating distance H of the light-shielding adhesive to be tested relative to the adherend is measured to evaluate the anti-separation ability of the light-shielding adhesive to be tested.

[0013] In one embodiment, the shading glue carrier is a metal plate.

[0014] In one embodiment, the light-shielding glue carrier is an aluminum plate or a stainless steel plate.

[0015] In one of the embodiments, the thickness of the light-shielding glue carrier is 0.4 mm.

[0016] In one embodiment, in the standard state, the light shielding glue sample to be tested is attached to the adherend to form a test piece, and is left to stand for a first preset time, including:

[0017] Performing a degreasing and cleaning operation on the surface of the adherend;

[0018] Under the standard state, the light-shielding adhesive sample to be tested is attached to the adherend, and a rolling member is used to roll and bond the light-shielding adhesive sample to be tested to form a test piece, which is then left to stand for a first preset time.

[0019] In one embodiment, the rolling member is a roller.

[0020] In one embodiment, the weight of the roller is 1kg to 3kg.

[0021] In one embodiment, the adherend is plastic.

[0022] In one embodiment, the length of the test piece is greater than the length of the inner cavity of the evaluation jig, so that the test piece is deformed in the inner cavity of the evaluation jig.

[0023] In one embodiment, the length dimension of the light-shielding adhesive sample to be tested is smaller than the length dimension of the adherend.

[0024] Compared with the prior art, the present invention has at least the following advantages:

[0025] The test method for evaluating the anti-separation ability of the display module shading glue of the present invention includes: attaching the shading glue to be tested to a shading glue carrier to form a shading glue sample to be tested; attaching the shading glue sample to be tested to an adherend under a standard state to form a test piece, and leaving it to stand for a first preset time; installing the test piece into the inner cavity of the evaluation jig so that the test piece is deformed in the inner cavity of the evaluation jig; placing the evaluation jig with the test piece installed under a preset environment, and leaving it to stand for a second preset time; in the deformation state of the test piece, the shading glue carrier is used to drive the shading glue to be tested to float and separate from the adherend; measuring the floating distance H of the shading glue to be tested relative to the adherend, thereby realizing the evaluation operation of the anti-separation ability of the shading glue to be tested. This is to facilitate the selection of shading glue with appropriate viscosity in the design stage of the display module project, so that the shading glue can pass the environmental reliability test of the display module and improve the production quality of the display module. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below.

[0027] Figure 1 It is a structural schematic diagram of a display module;

[0028] Figure 2 Schematic diagram of a flow chart of a test method for evaluating the anti-separation capability of a display module shading glue in one embodiment of the present invention;

[0029] Figure 3 It is a structural schematic diagram of a test piece and an evaluation fixture in a test method for evaluating the anti-separation ability of a light-shielding adhesive of a display module in one embodiment of the present invention; DETAILED DESCRIPTION

[0030] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the relevant drawings.

[0031] See also Figure 1 , Figure 2 and Figure 3 As shown, a test method for evaluating the anti-separation ability of the light shielding glue of the display module includes:

[0032] S100: attaching the light-shielding adhesive 110 to be tested to the light-shielding adhesive carrier 120 to form a light-shielding adhesive sample 100 to be tested;

[0033] S200: Under standard conditions, attach the shading glue sample 100 to the adherend 200 to form the test piece 10, and leave it for a first preset time; that is, when preparing the test piece 10, it is necessary to ensure that the test piece 10 is under standard conditions, for example, the temperature under standard conditions is 23°C, and the relative humidity under standard conditions is 50%RH, so that the viscosity of the shading glue can be prevented from being affected before testing, so as to ensure that the shading glue 110 to be tested is completely attached to the adherend 200, thereby ensuring the reliability of subsequent test results. In this embodiment, the first preset time can be 1 hour to ensure that the shading glue is completely attached to the adherend 200.

[0034] S300: Install the test piece 10 into the inner cavity of the evaluation jig 300, so that the test piece 10 is deformed in the inner cavity of the evaluation jig 300; the evaluation jig 300 is mainly used to limit the test piece 10, and at the same time, the test piece 10 is quickly deformed in the inner cavity of the evaluation jig 300 to generate a certain separation stress. For example, in this embodiment, the length of the test piece 10 is made larger than the length of the inner cavity of the evaluation jig 300, so that the test piece 10 is deformed in the inner cavity of the evaluation jig 300, such as Figure 3 As shown, the test piece 10 is bent to generate separation stress, thereby facilitating the subsequent separation force test operation. For example, the size of the adherend is 30 mm wide × 200 mm long, corresponding to the length of the inner cavity of the evaluation fixture 300 is 190 mm. At the same time, the width of the inner cavity of the evaluation fixture 300 can be greater than the width of the adherend, so as to facilitate the placement of the test piece 10 into the inner cavity of the evaluation fixture.

[0035] S400: placing the evaluation jig 300 with the piece to be tested 10 installed in a preset environment and letting it stand for a second preset time. When the piece to be tested 10 is in a deformed state, the light-shielding glue carrier 120 is used to drive the light-shielding glue 110 to be tested to float and separate from the adherend 200. The preset environment can be selected for matching according to the reliability test conditions of the display module. For example, in the present embodiment, the preset environment is a test box with a temperature of 85°C, that is, placing the evaluation jig 300 with the piece to be tested 10 installed in a test box at 85°C and letting it stand for a second preset time. The second preset time also needs to be selected for matching according to the actual reliability test time requirements of the display module. In the present embodiment, the second preset time is 24 hours. In the preset environment, the adhesive force between the adherend 200 and the light shielding adhesive 110 to be tested changes. In this way, the light shielding adhesive carrier 120 can be used to drive the light shielding adhesive 110 to be tested due to the stress generated by the bending deformation, causing the light shielding adhesive 110 to be tested and the adherend 200 to separate. Figure 3 As shown, one end of the light-shielding adhesive 110 to be tested floats and separates in a direction away from the adherend 200 .

[0036] S500: Measure the floating distance H of the light shielding glue 110 to be tested relative to the adherend 200 to evaluate the anti-separation ability of the light shielding glue 110 to be tested. That is, by measuring the floating distance H, the separation force level of the light shielding glue and the adherend 200 during the test is evaluated. The smaller the floating distance H, the better the anti-separation ability of the light shielding glue. This facilitates the selection of light shielding glue with appropriate viscosity during the design stage of the display module project, so that the light shielding glue can pass the environmental reliability test of the display module.

[0037] It should be noted that, please refer to Figure 3 As shown, the formed test piece 10 includes a light-shielding glue carrier 120, a light-shielding glue to be tested 110 and an adherend 200 which are stacked in sequence; wherein the adherend 200 simulates the polarizer of the display module, and preferably, the adherend 200 is plastic, and its material can be the outermost material of the polarizer. For example, the outermost material of the polarizer is usually triacetyl cellulose plastic, so preferably, the adherend 200 is triacetyl cellulose plastic. Since the surface properties of the polarizer are more likely to change during the reliability test, the viscosity between the light-shielding glue and the polarizer is more likely to change, that is, the polarizer and the light-shielding glue are more likely to separate, so in this test method, the separation force of the light-shielding glue relative to the adherend 200 (corresponding to the polarizer) is mainly measured. In addition, the test method of the present invention has the advantages of convenience and simplicity, thereby reducing the test cost.

[0038] In one embodiment, the light-shielding glue carrier 120 is a metal plate. Usually, the backlight metal frame in the backlight module is made of metal, so in order to be closer to the actual usage scenario, the light-shielding glue carrier 120 is also made of metal. For example, the material of the backlight metal frame is usually aluminum alloy material or stainless steel material, so in this embodiment, the light-shielding glue carrier 120 is an aluminum plate or a stainless steel plate. Preferably, the light-shielding glue carrier 120 is an aluminum plate, and the aluminum plate has better strength, moderate hardness, and relatively better flexibility, so it will not break during the bending process. For example, the thickness of the light-shielding glue carrier 120 is 0.4 mm, and preferably, the thickness of the aluminum plate is 0.4 mm.

[0039] Specifically, in step S200: under a standard state, the light shielding adhesive sample 100 is attached to the adherend 200 to form a test piece 10, and is left to stand for a first preset time, including:

[0040] S210: Degreasing and cleaning the surface of the adherend 200; the purpose of degreasing and cleaning the surface of the adherend 200 is to remove pollutants on the surface of the adherend 200, such as oil stains, release agents and other substances that affect the bonding performance and cause loose adhesion, thereby ensuring the bonding effect between the light-shielding glue 110 to be tested and the adherend 200, so as to improve the reliability of subsequent test results.

[0041] S220: Under standard conditions, attach the shading glue sample 100 to the adherend 200, and use a rolling part to roll and fit the shading glue sample 100 to form a test piece 10, and let it stand for a first preset time. That is, when the shading glue sample 100 is attached to the adherend 200, in order to ensure that the shading glue sample 100 is completely fitted with the adherend 200, a rolling part is used to roll and fit the shading glue sample 100. For example, in this embodiment, the rolling part is a roller, wherein the weight of the roller is 1kg to 3kg, so as to avoid the roller being too light or too heavy to affect the rolling effect. Preferably, the weight of the roller is 2kg, that is, a 2kg roller is used to reciprocately roll the shading glue sample 100 that is fitted on the adherend 200 to ensure that the shading glue sample 100 is completely fitted with the adherend 200.

[0042] In one embodiment, the length dimension of the light-shielding adhesive sample 100 to be tested is smaller than the length dimension of the adherend 200. For example, when the length dimension of the adherend 200 is 200 mm, the length dimension of the light-shielding adhesive sample 100 to be tested can be 180 mm. When the width dimension of the adherend 200 is 30 mm, the length dimension of the light-shielding adhesive sample 100 to be tested can be 20 mm. Since the purpose of the test is to measure the separation floating distance H of the light-shielding adhesive sample 100 relative to the adherend 200, while limiting the adherend 200 by the evaluation jig 300, it is necessary to avoid the side wall of the evaluation jig 300 from exerting a holding force on the light-shielding adhesive sample 100, which would affect the normal separation of the light-shielding adhesive sample 100. Therefore, the length dimension of the light-shielding adhesive sample 100 to be tested is smaller than the length dimension of the adherend 200. This makes it easier to measure the floating distance H. Please refer to Figure 3 As shown, when the shading glue sample 100 to be tested and the adherend 200 are attached, one end of the shading glue sample 100 is aligned with one end of the adherend 200, so that the inner cavity side wall of the evaluation fixture 300 squeezes one end of the shading glue sample 100 and one end of the adherend 200 at the same time, and the other end of the shading glue sample 100 (defined as the test separation end) is shorter than the other end of the adherend 200, so that the inner cavity side wall of the evaluation fixture 300 will not resist the test separation end of the shading glue sample 100, so that the test separation end can be normally separated from the adherend, reducing additional influencing factors. In this way, by measuring the floating distance H, the anti-separation ability of the shading glue can be evaluated, so as to select a shading glue with a suitable viscosity in the design stage of the display module project, so that the shading glue can pass the environmental reliability test of the display module and improve the production quality of the display module.

[0043] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. A test method for evaluating the anti-separation ability of the display module shading glue, characterized in that: include: Attaching the light-shielding adhesive to be tested to the light-shielding adhesive carrier to form a light-shielding adhesive sample to be tested; Under standard conditions, a light-shielding adhesive sample to be tested is attached to an adherend to form a test piece, and the piece is left to stand for a first preset time; Installing the test piece into the inner cavity of an evaluation jig so that the test piece is deformed in the inner cavity of the evaluation jig; Placing the evaluation fixture with the test piece installed thereon in a preset environment and leaving it to stand for a second preset time; When the tested object is in a deformed state, the light-shielding adhesive carrier is used to drive the tested light-shielding adhesive to float and separate from the adherend; The floating distance H of the light-shielding adhesive to be tested relative to the adherend is measured to evaluate the anti-separation ability of the light-shielding adhesive to be tested.

2. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 1, characterized in that: The light-shielding adhesive carrier is a metal plate.

3. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 2, characterized in that: The light-shielding adhesive carrier is an aluminum plate or a stainless steel plate.

4. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 3, characterized in that: The thickness of the light-shielding glue carrier is 0.4 mm.

5. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 1, characterized in that: In the standard state, the light shielding glue sample to be tested is attached to the adherend to form a test piece, and is left to stand for a first preset time, including: Performing a degreasing and cleaning operation on the surface of the adherend; Under the standard state, the light-shielding adhesive sample to be tested is attached to the adherend, and a rolling member is used to roll and laminate the light-shielding adhesive sample to be tested to form a test piece, which is then left to stand for a first preset time.

6. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 5, characterized in that: The rolling member is a roller.

7. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 6, characterized in that: The weight of the roller is 1kg to 3kg.

8. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 1, characterized in that: The adherend is plastic.

9. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 1, characterized in that: The length of the test piece is greater than the length of the inner cavity of the evaluation jig, so that the test piece is deformed in the inner cavity of the evaluation jig.

10. The test method for evaluating the anti-separation ability of the display module shading glue according to claim 9, characterized in that: The length dimension of the light-shielding adhesive sample to be tested is smaller than the length dimension of the adherend.

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