Method for detecting falling of optical diffusion film particles and application

Abstract

The invention provides a method for detecting falling of optical diffusion film particles and application, and relates to the technical field of diffusion film detection, and the method comprises the following steps: alternately stacking a plurality of diaphragms to be detected and barrier diaphragms which are the same in size, and after vibration treatment by a hydraulic vibration table, adhering the falling diffusion particles on the diaphragms to be detected by dust-sticking paper; and evaluating whether the to-be-inspected membrane is qualified or not according to the number of the diffusion particles adhered to the to-be-inspected membrane. The method can quickly and accurately select the diffusion membrane of which the diffusion particles are not easy to fall off. The diffusion film which is qualified through evaluation is used in electronic products, so that on one hand, the production cost is reduced, the yield is improved, and on the other hand, the quality of terminal electronic products is ensured. The method is applied to the quality control of the optical diffusion film, has the characteristics of rapidness, accuracy and high efficiency, can be used for evaluating the bonding capacity of particles and resin, improving the production yield and reducing the labor and raw material consumption cost, and has important guiding significance for the production of the diffusion film.

Description

Technical Field

[0001] The present invention relates to the technical field of diffusion film inspection, and in particular to a method for inspecting the shedding of optical diffusion film particles and its application. Background Art

[0002] The optical diffusion film is mainly applied by a micro-concave coating process, where a coating liquid formed by a mixture of resin, particles and additives is applied to the surface of the substrate through an anilox roller, and then subjected to thermal curing or UV curing treatment to form a diffusion layer attached to the upper surface of the substrate and an anti-adhesion layer on the lower surface of the substrate. Different types of resins have different degrees of curing and cross-linking, resulting in different degrees of bonding with particles. In addition, the morphological structure of the particle surface will also have a certain effect on the degree of bonding between the particles and the resin. In the actual application scenarios of the diffusion film, on the one hand, the diffusion film specification materials are prone to relative movement during transportation, coil slitting and cutting, sheet washing, and sheet assembly and use. If the diffusion particles are not well bonded to the coating, there is a risk of particles falling off the coating under the action of external forces. This will increase the use of dust-sticking paper and a large amount of labor in the washing process, resulting in higher material and labor costs. On the other hand, during the module testing process or when the electronic product is used by the user, the diffusion film will rub against other components in the electronic product or backlight module, which can easily cause the diffusion film to fall off, resulting in visible white spots in the backlight or module state. For optical film manufacturers, complaints from end customers will bring immeasurable losses. In fact, there are few reports on how to test the particle shedding of optical films.

[0003] In the prior art, a detection device is rubbed against the surface of a diffusion membrane to be tested, and the surface of the diffusion membrane to be tested is observed to see if there are any particle shedding defects. Although this method can be used to determine the wear resistance of the particles of the diffusion membrane and whether they are deformed, it may also scratch the coating, interfering with the determination of the degree of bonding between the particles and the coating.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] One of the purposes of the present invention is to provide a method for testing the shedding of optical diffusion film particles, so as to solve the technical problem in the prior art that there is a lack of a test method for testing the degree of bonding between the coating and the particles without almost damaging the coating structure.

[0006] A second object of the present invention is to provide application of the above method in quality control of optical diffusion films.

[0007] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0008] In the first aspect, the present invention provides a method for inspecting the shedding of particles from an optical diffusion film, comprising alternately stacking a number of films to be inspected of the same size and barrier films, and using sticky paper to adhere to the diffusion particles that have fallen off the films to be inspected after being vibrated on a hydraulic vibration table, and evaluating whether the films to be inspected are qualified based on the number of diffusion particles adhered to the films to be inspected.

[0009] It should be noted that since the diffusion film structure includes two sides, the front side (or matte side / light emitting side) and the back side (or bright side / light entering side), in order to accurately determine whether the diffusion film sheds particles on the front side or the back side, a barrier film is placed between the two diffusion films to prevent direct contact between the front and back sides, which would cause interference in the judgment of whether the particles shed on the front side or the back side. In summary, the strategy of placing a barrier film can help diffusion film manufacturers to make targeted improvements based on which side of the diffusion film sheds particles.

[0010] Furthermore, the acceleration of the oscillation treatment is 0.5 to 9 g.

[0011] Furthermore, the frequency of the oscillation treatment is 1 to 300 Hz, preferably 10 to 60 Hz;

[0012] Furthermore, the amplitude of the oscillation treatment is 0.5 to 3 mm.

[0013] Furthermore, the shaking treatment time is 10 to 60 minutes.

[0014] Further, the sticky paper adhering to the diffusion particles detached from the membrane to be tested includes using the sticky paper to adhere to the diffusion particles detached from the test surface of the membrane to be tested.

[0015] Furthermore, the method for counting the number of diffuse particles includes dividing the sticky paper into a number of detection areas, and selecting at least 5 detection areas for diffuse particle counting;

[0016] Preferably, any number of 5, 9, 13 or 18 detection areas are selected, and preferably 13 detection areas are selected.

[0017] Furthermore, the size of the detection area is (1-10) mm×(1-10) mm, preferably 5 mm×5 mm.

[0018] Furthermore, the barrier film is a UV-cured film without particle shedding.

[0019] In a second aspect, the present invention provides application of the above method in quality control of optical diffusion films.

[0020] The present invention provides a method for inspecting the shedding of optical diffusion film particles, which uses a barrier film to be placed between two diffusion films to prevent the two diffusion films from directly contacting and interfering with the judgment; the optical diffusion film is vibrated to simulate the vibration test of the diffusion film during transportation until it is assembled into an electronic product, as well as the friction caused by contact with the terminal electronic product during use, so as to detect the degree of particle bonding on the diffusion film to determine whether the diffusion film particles are easy to fall off; by adhering the diffusion particles on the film to be inspected, the diffusion film whose diffusion particles are not easy to fall off can be quickly and accurately selected for use in electronic products, which can reduce production costs and improve yields on the one hand, and ensure the quality of terminal electronic products on the other hand, and enhance customer experience. The inspection method provided by the present invention evaluates the bonding ability of particles and resins without basically damaging the coating structure, and is fast, accurate and efficient in the application of optical diffusion film quality control. It is conducive to improving production yields and reducing costs, and has important guiding significance for production. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A flow chart of a method for inspecting the shedding of optical diffusion film particles provided in Example 1 of the present invention;

[0023] Figure 2 A schematic diagram of a cross-stacked film to be inspected and a barrier film provided in Example 1 of the present invention, wherein I represents the film to be inspected, I-i represents the front side of the film to be inspected, I-ii represents the back side of the film to be inspected, II represents the barrier film, II-i represents the front side of the barrier film, and II-ii represents the back side of the barrier film;

[0024] Figure 3 This is a schematic diagram of the detection area provided in Example 1 of the present invention. DETAILED DESCRIPTION

[0025] Unless otherwise defined herein, scientific and technical terms used in conjunction with the present invention shall have the meanings commonly understood by those of ordinary skill in the art. The meaning and scope of the terms should be clear, however, in the case of any potential ambiguity, the definitions provided herein take precedence over any dictionary or external definitions. In this application, unless otherwise stated, the use of "or" means "and / or". In addition, the use of the term "including" and other forms is non-limiting.

[0026] The methods and techniques of the present invention are generally performed according to conventional methods well known in the art and as described in various general and more specific references that are cited and discussed throughout the present specification unless otherwise indicated.

[0027] On the one hand, the present invention provides a method for inspecting the shedding of particles from an optical diffusion film, comprising alternately stacking a plurality of films to be inspected of the same size and barrier films, and after oscillation treatment on a hydraulic vibration table, using sticky paper to adhere to the diffusion particles that have fallen off the films to be inspected, and evaluating whether the films to be inspected are qualified based on the number of diffusion particles adhered to the films to be inspected.

[0028] Since the diffusion film structure includes a front side and a back side, in order to accurately determine whether the diffusion film is shedding particles on the front side or the back side, a barrier film is placed between the two diffusion films to prevent the two diffusion films from directly contacting and interfering with the judgment; by vibrating the optical diffusion film, the vibration test of the diffusion film during transportation until it is assembled into an electronic product and the friction caused by contact with the terminal electronic product during use are simulated, so as to detect the degree of particle bonding on the diffusion film to determine whether the diffusion film particles are easy to fall off; by adhering the diffusion particles on the film to be tested, the diffusion film whose diffusion particles are not easy to fall off can be quickly and accurately selected for use in electronic products, which can reduce production costs and improve yields on the one hand, and ensure the quality of terminal electronic products on the other hand. A test method for testing the degree of bonding between the coating and the particles is provided without damaging the coating structure.

[0029] In order to facilitate the inspection, the membrane to be inspected and the barrier membrane can be cut into membranes of a certain size with a cutting knife. The number n of the membrane to be inspected can be specifically 10 pcs, or more than 10 pcs, such as 10 pcs, or 15 pcs, or 20 pcs, or 30 pcs. It can also be other numbers according to actual needs. In order to be able to evaluate the membrane to be inspected faster and more accurately, 20 pcs is preferred. The number of barrier membranes is n+1. The first and last membranes of the vibration test are both barrier membranes. The back of the group diaphragm is in contact with the front of the membrane to be inspected, and the front of the barrier membrane is in contact with the back of the membrane to be inspected.

[0030] In some specific implementations, the acceleration of the oscillation treatment using the hydraulic vibration table is 0.5 to 9 g.

[0031] The acceleration of the oscillation treatment may be, but is not limited to, 0.5g, 1g, 2g, 3g, 4g, 5g, 6g, 7g, 8g or 9g, or any value between 0.5 and 9g.

[0032] In some specific embodiments, the frequency of the oscillation treatment using the hydraulic vibration table is 1 to 300 Hz.

[0033] The frequency of the oscillation treatment may be, but is not limited to, 1 Hz, 10 Hz, 30 Hz, 50 Hz, 60 Hz, 100 Hz, 150 Hz, 200 Hz, 250 Hz or 300 Hz, preferably 10 to 60 Hz.

[0034] In some specific embodiments, the amplitude of the oscillation treatment by the hydraulic vibration table is 0.5 to 3 mm.

[0035] In some specific embodiments, the shaking treatment time by the hydraulic vibration table is 10 to 60 minutes.

[0036] The oscillation treatment time may be, but is not limited to, 10 min, 20 min, 30 min, 40 min, 50 min, or 60 min, and may be any value between 10 and 60 min.

[0037] In some specific embodiments, the sticky paper adheres to the diffusion particles that fall off the membrane to be tested, including using the sticky paper to adhere to the diffusion particles that fall off the contact surface of the membrane to be tested, and transferring the diffusion particles that fall off the membrane to the sticky paper. The above method is used to simulate the material washing process.

[0038] In some specific embodiments, the method for counting the number of diffuse particles includes dividing the sticky paper into a number of detection areas, and selecting at least 5 detection areas for diffuse particle counting;

[0039] Among them, a marker pen can be used to mark grids on the sticky paper to form several detection areas of the same size; at least 5 of the detection areas are randomly selected to count the diffused particles; specifically, the number of diffused particles in the detection area can be analyzed by a laser microscope and the data can be recorded.

[0040] In some specific embodiments, any number of 5, 9, 13 or 18 detection areas are selected, and preferably 13 detection areas are selected to perform diffuse particle counting.

[0041] In some specific embodiments, the size of the detection area is (1-10) mm×(1-10) mm.

[0042] Among them, the size of the detection area can be but is not limited to 1mm×1mm, 2mm×2mm, 3mm×3mm, 4mm×4mm, 5mm×5mm, 6mm×6mm, 7mm×7mm, 8mm×8mm, 9mm×9mm or 10mm×10mm, and it can also be any area size between (1~10)mm×(1~10)mm. The preferred size of the detection area is 5mm×5mm.

[0043] In some specific embodiments, the contact film of the test film is a barrier film, and the barrier film is a UV-cured film without particle shedding.

[0044] Among them, the UV-cured film has a strong ability to bind particles to the UV coating after testing, and there is almost no particle shedding. Therefore, the UV-cured film can be selected as the contact film for the test film.

[0045] The above method can be used to detect the actual falling off of diffusion film particles, and has the characteristics of being fast, accurate and efficient. The present invention provides the application of the above method in the quality control of optical diffusion films. In actual production, this method can be used to evaluate the binding ability of particles and resins, improve production yield and reduce costs, which has important guiding significance for the production of diffusion films.

[0046] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0047] Standard film: The standard film used in the following examples is a diffusion film produced by Japan Huihe Company (hereinafter referred to as Huihe), and the client feedback shows that the particle shedding is qualified. Clean the standard film with a sticky roller and set aside.

[0048] Film to be tested (Ⅰ): The film to be tested (Ⅰ) used in the following embodiments includes film 1, film 2 and film 3, all of which are optical diffusion films produced by Ningbo Jizhi Technology Co., Ltd. (hereinafter referred to as Jizhi). The optical diffusion film adopts a micro-concave coating process to apply a resin solution on the surface of the substrate, and then a thermal curing process is used to cure the coating. The production process of the film to be tested (Ⅰ) is the same. The conventional indicators such as adhesion and hardness of the film to be tested (Ⅰ) are qualified. The difference between the film to be tested (Ⅰ) is that the resin or particles used are different. Clean the film to be tested (Ⅰ) with a sticky roller and set aside.

[0049] According to the feedback from the client, the particle shedding degree of the membrane to be tested (I) is as follows: the particle shedding degree of membrane 2 is the lightest, which is close to the standard membrane Huihe diffusion membrane. The particle shedding degree of membrane 1 and membrane 3 is the most serious. It is judged that the particle shedding degree of membrane 2 is qualified, and the particle shedding degree of membrane 1 and membrane 3 is unqualified.

[0050] The matte surface formula and glossy surface formula compositions of the membranes 1 to 3 are shown in Table 1.

[0051] Table 1 Composition of matte and glossy surface formulas of the film to be tested (Ⅰ)

[0052]

[0053]

[0054] Barrier film (II): Use UV-curable film produced by Jizhi Technology that has been tested and has no particle shedding. Clean the barrier film with a sticky roller and set aside.

[0055] The present invention divides the diffusion membrane particle shedding evaluation into five levels according to the number of shedding particles, namely level 0, level 1, level 2, level 3, and level 4, as shown in Table 2.

[0056] Table 2 Average number of particles falling off in 20pcs

[0057] level <![CDATA[20pcs average particle shedding quantity χ ( / 25mm 2 )]]> Particle shedding degree Eligibility Level 0 χ<1 none qualified Level 1 1≤χ<10 slight qualified Level 2 10≤χ<40 generally qualified Level 3 40≤χ<100 medium Failure Level 4 χ≥100 serious Failure

[0058] Example 1

[0059] Combination Figure 1 A method for testing the shedding of optical diffusion film particles is described below. The particle shedding of the film to be tested (I) is tested according to the following steps. At the same time, a standard film (Huihe film) is selected to replace the film to be tested (I) for testing as a standard control. Among them, the stacking method of the film to be tested and the barrier film is as follows: Figure 2 As shown, I represents the membrane to be tested, I-i represents the front side of the membrane to be tested, I-ii represents the back side of the membrane to be tested, II represents the barrier membrane, II-i represents the front side of the barrier membrane, and II-ii represents the back side of the barrier membrane.

[0060] Step 1: Simulate the cutting process and cut the film to be tested (I) and barrier film (II) into 10cm×10cm pieces, the quantity is 20pcs and 21pcs respectively. Use a sticky roller to clean the surface of the film to be tested (I) and barrier film (II), then put the film to be tested (I) and barrier film (II) alternately into the ziplock bag.

[0061] Step 2: Simulate the transportation process, place the diaphragm sealed in the ziplock bag on a hydraulic vibration table and set the vibration conditions: vibration acceleration 9g, vibration frequency 50Hz, amplitude 1.8mm, and vibration time 30min.

[0062] Step 3: Simulate the washing process. After the oscillation is finished, take out the membrane, stick the membrane contact surface with sticky paper, and stick the diffusion particles on the test surface on the sticky paper. Use a marker to make grids on the sticky paper in the size of 20mm×20mm, such as Figure 3 As shown. 13 areas are selected as detection areas for counting, such as Figure 3 As shown in the shaded part, the shaded part is a small square of 5 mm×5 mm and is located at the center of the 20 mm×20 mm square.

[0063] Step 4: Analyze the number of particles in the shadow area of ​​the sticky paper grid area through a laser microscope, record the data, and calculate the average value.

[0064] Membrane 1, membrane 2, membrane 3, Huihe diffusion membrane were all tested according to the above steps. The test results are shown in Table 3.

[0065] Table 3 Particle shedding after vibration test of different diaphragms in Example 1

[0066]

[0067]

[0068] As can be seen from Table 3, the matte and bright surfaces of diaphragm 2 drop fewer particles, which is close to the Huihe standard diaphragm and is judged to be qualified. The matte surface of diaphragm 1 drops fewer particles, and the bright surface of diaphragm 3 drops fewer particles, but diaphragm 1 and diaphragm 3 drop more particles as a whole, and the particle shedding of these two diaphragms is judged to be unqualified. The test results of this embodiment 1 are consistent with the feedback results from the client. It should also be noted that the bright surface of diaphragm 1 and the matte surface of diaphragm 3 drop more particles, which needs further improvement in the actual production of diffusion membranes.

[0069] Example 2

[0070] The difference from Example 1 is that the vibration conditions of the vibration equipment in step 2 of Example 2 are vibration acceleration 2g, vibration frequency 20Hz, amplitude 2.5mm, and vibration time 30min. The test results are shown in Table 4.

[0071] Table 4 Particle shedding after vibration test of different diaphragms in Example 2

[0072]

[0073]

[0074] It can be seen from Table 4 that as the amplitude increases, the degree of particle shedding of the membrane in Example 2 increases more than that in Example 1, but the membrane 2 and the Huihe diffusion membrane are still within the qualified range. The test results of Example 2 are consistent with the feedback results from the client.

[0075] Example 3

[0076] The difference from Example 1 is that the vibration conditions of the vibration equipment in step 2 of Example 3 are vibration acceleration 2g, vibration frequency 30Hz, amplitude 1mm, and vibration time 30min. The test results are shown in Table 5.

[0077] Table 5 Particle shedding after vibration test of different diaphragms in Example 3

[0078]

[0079] It can be seen from Table 5 that as the amplitude decreases, the degree of membrane particle shedding in Example 3 is less than that in Example 1. The test results of Example 3 are also consistent with the feedback results from the client.

[0080] Comparative Example 1

[0081] The difference from Example 1 is that the vibration conditions of the vibration equipment in step 2 of Comparative Example 1 are vibration acceleration 1g, vibration frequency 50Hz, amplitude 0.2mm, and vibration time 30min. The test results are shown in Table 6.

[0082] Table 6 Particle shedding after vibration test of different diaphragms in Comparative Example 1

[0083]

[0084] It can be seen from Table 6 that under the condition of an amplitude of 0.2 mm, the test results of the diffusion film of Comparative Example 1 deviate from the results fed back by the client.

[0085] Comparative Example 2

[0086] The difference from Example 1 is that, in step 2 of Comparative Example 2, the vibration conditions of the vibration equipment are vibration acceleration 6g, vibration frequency 30Hz, amplitude 3.5mm, and vibration time 30min. The test results are shown in Table 7.

[0087] Table 7 Particle shedding after vibration test of different diaphragms in comparative example 2

[0088]

[0089] It can be seen from Table 7 that when the amplitude is 3.5 mm, the diffusion film test results of Comparative Example 2 deviate from the client feedback results.

[0090] Comparative Example 3

[0091] The difference from Example 1 is that the oscillation treatment time in step 2 of Comparative Example 3 is 5 minutes. The test results are shown in Table 8.

[0092] Table 8 Particle shedding after vibration test of different diaphragms in comparative example 3

[0093]

[0094]

[0095] It can be seen from Table 8 that when the vibration time is reduced to 5 minutes, the diffusion film test results of Comparative Example 3 deviate from the client feedback results.

[0096] Comparative Example 4

[0097] The difference from Example 1 is that the oscillation treatment time in step 2 of Comparative Example 4 is 100 minutes. The test results are shown in Table 9.

[0098] Table 9 Particle shedding after vibration test of different diaphragms in Comparative Example 4

[0099]

[0100]

[0101] It can be seen from Table 9 that when the vibration time is increased to 100 min, the diffusion membrane test results of Comparative Example 4 deviate from the client results.

[0102] Comparative Example 5

[0103] The difference from Example 1 is that in step 1 of Comparative Example 5, the number of the film sheets (I) to be tested is 2 pcs, and the number of the barrier film sheets (II) is 3 pcs. According to Example 1, the 20 pcs average particle shedding number judgment standard is parallel migrated, as shown in Table 10. The test results of this Comparative Example 5 are shown in Table 11.

[0104] Table 10 Average number of particles falling off 2pcs (ξ=1 / 10χ)

[0105] level <![CDATA[2pcs average particle shedding quantity ξ ( / 25mm 2 )]]> Particle shedding degree Eligibility Level 0 ξ<0.1 none qualified Level 1 0.1≤ξ<1 slight qualified Level 2 1≤ξ<4 generally qualified Level 3 4≤ξ<10 medium Failure Level 4 ξ≥10 serious Failure

[0106] Table 11 Particle shedding after vibration test of different diaphragms in comparative example 5

[0107]

[0108]

[0109] It can be seen from Table 11 that in Comparative Example 5, since the number of samples selected was 2 pcs, the number of samples was too small, resulting in a deviation between the diffusion film test results and the client feedback results.

[0110] Comparative Example 6

[0111] The difference from Example 1 is that three detection areas are randomly selected in step 3 of Comparative Example 6. The test results are shown in Table 12.

[0112] Table 12 Particle shedding after vibration test of different diaphragms in Comparative Example 6

[0113]

[0114] It can be seen from Table 12 that the number of regions selected in Comparative Example 6 is 3, and the number of regional samples is too small, resulting in a deviation between the diffusion film test results and the client results.

[0115] It can be seen from the above embodiments and comparative examples that the test results of the embodiments are consistent with the client feedback results, while the test results of the comparative examples are deviated from the client feedback results. Too few samples or too few selected areas will cause the test results to deviate greatly, resulting in distortion of the test results. Therefore, the preferred test conditions in the embodiment include 20 pieces of diaphragms (Ⅰ) to be tested, 13 test areas, an area size of 5mm×5mm, an oscillation acceleration of 0.5g~9g, a vibration frequency of 10Hz~60Hz, a vibration time of 10min~60min, and an amplitude of 0.5~3mm, which can produce relatively ideal results.

[0116] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for inspecting the shedding of optical diffusion film particles, characterized in that: The method comprises alternately stacking a number of membranes to be inspected of the same size and barrier membranes, and using sticky paper to adhere to diffusion particles that fall off the membranes to be inspected after being vibrated on a hydraulic vibration table. Whether the membranes to be inspected are qualified is evaluated based on the number of diffusion particles adhered to the membranes to be inspected.

2. The method according to claim 1, characterized in that The acceleration of the oscillation treatment is 0.5 to 9 g.

3. The method according to claim 1, characterized in that: The frequency of the oscillation treatment is 1 to 300 Hz, preferably 10 to 60 Hz.

4. The method according to claim 1, characterized in that The amplitude of the oscillation treatment is 0.5 to 3 mm.

5. The method according to claim 1, characterized in that The shaking treatment time is 10 to 60 minutes.

6. The method according to claim 1, characterized in that The sticky paper sticking the diffusion particles that fall off the membrane to be tested includes using the sticky paper to stick the diffusion particles that fall off the test surface of the membrane to be tested.

7. The method according to claim 6, characterized in that The method for counting the number of diffuse particles includes dividing the sticky paper into a number of detection areas, and selecting at least 5 detection areas for diffuse particle counting; Preferably, any number of 5, 9, 13 or 18 detection areas are selected, and preferably 13 detection areas are selected.

8. The method according to claim 7, characterized in that The size of the detection area is 1-10 mm×1-10 mm, preferably 5 mm×5 mm.

9. The method according to any one of claims 1 to 8, characterized in that: The barrier film is a UV-cured film without particle shedding.

10. Use of the method according to any one of claims 1 to 9 in quality control of optical diffusion films.

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