Optical adhesive structure and method for manufacturing the same

Abstract

The present application relates to an optical adhesive structure and a method for manufacturing the optical adhesive structure, including an optical adhesive body, a first release film, a second release film and a protective film. The optical adhesive body has a first surface and a second surface arranged opposite to each other, the first release film and the second release film are respectively attached to the first surface and the second surface, and the protective film is attached to the side of the first release film away from the optical adhesive body. Among them, the plane where the first surface is located is defined as the first plane, the orthographic projection of the protective film on the first plane is the first projection, and the orthographic projection of the optical adhesive body on the first plane is the second projection. The first projection covers the second projection, and there are overlapping areas and non-overlapping areas between the first projection and the second projection. The optical adhesive structure provided by the present application can remove the first release film from the optical adhesive body by peeling off the protective film. On the basis of ensuring the ease of peeling, there is no need to replace the first release film, thereby avoiding the risk of contamination that may exist during the replacement process.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical adhesive structure and a method for manufacturing the optical adhesive structure. Background Art

[0002] Optical adhesive is one of the important raw materials for touch screens. To prevent the optical adhesive from being contaminated, it is usually necessary to protect it with the help of a release film. However, after die-cutting, the release film needs to be replaced, and there is a risk of contaminating the optical adhesive during the replacement process. Summary of the invention

[0003] Based on this, an optical adhesive structure and a method for manufacturing the optical adhesive structure without replacing a release film are provided to avoid the problem of contaminating the optical adhesive due to replacing the release film.

[0004] In one aspect of the present application, an optical adhesive structure is provided, comprising:

[0005] The optical adhesive body has a first surface and a second surface disposed opposite to each other;

[0006] A first release film and a second release film are attached to the first surface and the second surface respectively; and

[0007] A protective film is attached to a side of the first release film that is away from the optical adhesive body;

[0008] The plane where the first surface is located is defined as the first plane, the orthographic projection of the protective film on the first plane is defined as the first projection, and the orthographic projection of the optical adhesive body on the first plane is defined as the second projection;

[0009] The first projection covers the second projection, and there is an overlapping area and a non-overlapping area between the first projection and the second projection.

[0010] In one embodiment, the non-overlapping area surrounds the overlapping area.

[0011] In one embodiment, the release force between the protective film and the first release film is the first release force, and the release force between the optical adhesive body and the first release film is the second release force;

[0012] The first release force is greater than the second release force.

[0013] In one embodiment, the ratio of the first release force to the second release force is greater than 5.

[0014] In one embodiment, the second release force is 3 g / inch-5 g / inch, and the first release force is greater than 25 g / inch.

[0015] In one embodiment, the release force between the protective film and the first release film is the first release force, and the release force between the optical adhesive body and the second release film is the third release force;

[0016] The first release force is smaller than the third release force.

[0017] In one embodiment, the orthographic projection of the second release film on the first plane is the third projection;

[0018] The first projection covers the third projection.

[0019] In one embodiment, the outer contour of the first projection completely coincides with the outer contour of the third projection.

[0020] In one embodiment, there is a first distance between an outer contour of the third projection and an outer contour of the second projection.

[0021] In one embodiment, the first spacing is greater than 6 mm.

[0022] In one embodiment, the protective film has a dimension in a thickness direction of 25 micrometers to 100 micrometers.

[0023] Another aspect of the present application further provides a method for manufacturing an optical adhesive structure, the method comprising:

[0024] Cutting the first release film and the optical adhesive body in the preform according to a preset size; the preform comprises a second release film, an optical adhesive body and a first release film stacked along a first direction;

[0025] Attaching the protective film to the side of the first release film away from the optical adhesive body to form an optical adhesive structure;

[0026] The plane perpendicular to the first direction is defined as the first plane, the orthographic projection of the protective film on the first plane is the first projection, and the orthographic projection of the optical adhesive body on the first plane is the second projection;

[0027] The first projection covers the second projection, and there is an overlapping area and a non-overlapping area between the first projection and the second projection.

[0028] In the above optical adhesive structure and the method for making the optical adhesive structure, the first release film and the second release film can protect the optical adhesive body. There is a non-overlapping area between the first projection of the protective film and the second projection of the optical adhesive body, that is, the size of the protective film is larger than the size of the optical adhesive body. When the optical adhesive body needs to be used, the first release film can be removed from the optical adhesive body by peeling off the larger protective film attached to the first release film. On the basis of ensuring the ease of peeling, there is no need to replace the first release film, thereby avoiding the risk of contamination that may exist during the replacement process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A cross-sectional schematic diagram of an optical adhesive structure according to an embodiment of the related art;

[0030] Figure 2 A schematic diagram of a roll-type optical adhesive structure according to an embodiment of the related art;

[0031] Figure 3 A cut-out schematic diagram of an optical adhesive structure according to an embodiment of the related art;

[0032] Figure 4 It is a cross-sectional schematic diagram of an optical adhesive structure after the first release film is replaced according to an embodiment of the related art;

[0033] Figure 5 An exploded schematic diagram of an optical adhesive structure according to an embodiment of the related art;

[0034] Figure 6 A schematic cross-sectional view of an optical adhesive structure according to an embodiment of the present application;

[0035] Figure 7 This is an exploded schematic diagram of an optical adhesive structure according to an embodiment of the present application;

[0036] Figure 8 A schematic diagram of a first projection, a second projection, and a third projection of an embodiment of the present application;

[0037] Fig. 9 FIG. 4 is a flow chart of a method for manufacturing an optical adhesive structure according to an embodiment of the present application.

[0038] Description of reference numerals:

[0039] 10, 100: Optical adhesive structure 11, 110: Optical adhesive body

[0040] 11a, 111: first surface 11b, 112: second surface

[0041] 12, 120: first release film 13, 130: second release film

[0042] k: tool p: foreign matter

[0043] 140: Protective film S 1 : First Projection

[0044] S 2 : Second projection S 3 : The Third Projection

[0045] R: First plane A: Overlap area

[0046] B: non-overlapping area L: first spacing

[0047] D 1 , D 2 , D 3 d 1 d 2 :Thickness DETAILED DESCRIPTION

[0048] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0049] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0051] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0053] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0054] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the elements in the drawings are drawn only as examples and not necessarily according to the true scale.

[0055] In order to facilitate understanding of the technical solution of the present application, before detailed description, the optical adhesive structure in the related art is first explained.

[0056] Optical adhesive is used to bond modules, such as mobile phones, tablets, smart watches, and augmented reality / virtual reality (AR / VR) display modules and touch modules. In order to ensure the display effect, the quality of optical adhesive has high requirements. During the transportation of optical adhesive, it is usually necessary to use release film to protect the optical adhesive to prevent it from being damaged or contaminated by the outside.

[0057] Figure 1 A cross-sectional schematic diagram of an optical adhesive structure 10 according to an embodiment of the related art is shown.

[0058] like Figure 1As shown, the optical adhesive structure 10 in an embodiment of the related art includes an optical adhesive body 11, a first release film 12 and a second release film 13. The optical adhesive body 11 has a first surface 11a and a second surface 11b that are arranged opposite to each other, and the first release film 12 and the second release film 13 are respectively attached to the first surface 11a and the second surface 11b. Exemplarily, the first release film 12 is a light release film, and the second release film 13 is a heavy release film. In this way, when using the optical adhesive body 11, the first release film 12 can be peeled off first, and then the optical adhesive body 11 can be attached to the object to be attached, and then the second release film 13 can be peeled off.

[0059] For example, the thickness of the first release film 12 is defined as d 1 , define the thickness of the second release film 13 as d 2 , the thickness dimension d of the first release film 12 when the material is received 1 The thickness dimension d of the second release film 13 is 38 microns. 2 is 100 microns.

[0060] Figure 2 A schematic diagram showing a roll-shaped optical adhesive structure 10 according to an embodiment of the related art is shown; Figure 3 A schematic diagram of cutting an optical adhesive structure 10 according to an embodiment of the related art is shown.

[0061] However, if Figure 2 As shown, the optical adhesive structure 10 is usually supplied in the form of a roll, and in actual use, the size of the optical adhesive structure 10 has corresponding requirements. Therefore, it is necessary to cut the optical adhesive structure 10 in the form of a roll, such as Figure 3 As shown, the first release film 12 and the optical adhesive body 11 are usually cut by a cutter k to meet the size requirements. Figure 3 and Figure 1 As shown, the size of the cut first release film 12 is the same as the size of the optical adhesive body 11 , which also makes it difficult to peel the first release film 12 from the optical adhesive body 11 , making it difficult to meet customer needs.

[0062] Figure 4 A cross-sectional schematic diagram of the optical adhesive structure 10 after the first release film 12 is replaced according to an embodiment of the related art is shown.

[0063] See also Figure 4On this basis, the inventor tried to peel off the first release film 12 from the optical adhesive body 11 after cutting, and then replace it with a new first release film 12 with a larger size and attach it to the first surface 11a of the optical adhesive body 11. Since the quality requirements of the optical adhesive body 11 are relatively high, the quality requirements of the first release film 12 and the second release film 13 are also relatively high. Usually, optical-grade first release films 12 and second release films 13 are required, and the cleanliness, uniformity of the release agent and reliability requirements of the first release film 12 and the second release film 13 are also relatively high, which also leads to the high cost of the first release film 12 and the second release film 13. Similarly, in order to ensure the quality of the optical adhesive body 11, the new first release film 12 to be replaced also needs to be selected from the same quality or even better quality release film. For example, the thickness dimension d of the replaced first release film 12 is 1 It can be seen that replacing the first release film 12 with a new one not only makes the process more complicated, but also makes the cost more expensive.

[0064] Figure 5 An exploded schematic diagram of an optical adhesive structure 10 according to an embodiment of the related art is shown.

[0065] In addition, Figure 5 As shown, during the entire process of peeling the cut first release film 12 from the optical adhesive body 11 and attaching the new first release film 12 to the optical adhesive body 11, the possibility of the optical adhesive body 11 being contaminated by foreign matter p in the environment is greatly increased. It is also possible that the optical adhesive body 11 is not contaminated by foreign matter p in the replacement environment during the process of replacing the first release film 12, but when the optical adhesive structure 10 is provided in the form of a roll provided by the raw material supplier, there are already foreign matter p between the optical adhesive body 11 and the first release film 12. In this case, it is difficult to clearly divide the responsibility for contaminating the optical adhesive body 11. Furthermore, when the first release film 12 is peeled off from the optical adhesive body 11, if the quality of the release agent of the raw material supplier is not up to standard or the release agent is uneven, it may cause the release agent to remain on the optical adhesive body 11 when the first release film 12 is peeled off. This situation will also lead to unclear division of responsibilities.

[0066] Based on this, the inventors of the present application have conducted in-depth research and improved the optical adhesive structure 10 to improve the ease of peeling the first release film 12 from the optical adhesive body 11 without replacing the first release film 12, thereby reducing the risk of contaminating the optical adhesive body 11.

[0067] For ease of description, the drawings only show structures related to the embodiments of the present application.

[0068] Figure 6A cross-sectional schematic diagram of an optical adhesive structure 100 according to an embodiment of the present application is shown; Figure 7 An exploded schematic diagram of an optical adhesive structure 100 according to an embodiment of the present application is shown; Figure 8 The first projection S of an embodiment of the present application is shown. 1 , the second projection S 2 and the third projection S 3 Schematic diagram of .

[0069] See also Figure 6 , and combined with Figure 7 The optical adhesive structure 100 provided in one embodiment of the present application includes an optical adhesive body 110, a first release film 120, a second release film 130 and a protective film 140. The optical adhesive body 110 has a first surface 111 and a second surface 112 disposed opposite to each other, the first release film 120 and the second release film 130 are attached to the first surface 111 and the second surface 112 respectively, and the protective film 140 is attached to the side of the first release film 120 away from the optical adhesive body 110. Figure 8 , and combined with Figure 6 and Figure 7 , wherein the plane where the first surface 111 is located is defined as the first plane R, and the orthographic projection of the protective film 140 on the first plane R is the first projection S 1 The orthographic projection of the optical adhesive body 110 on the first plane R is the second projection S 2 The first projection S 1 Cover the second projection S 2 , and the first projection S 1 With the second projection S 2 There is an overlapping area A and a non-overlapping area B.

[0070] The optical adhesive structure 100, the first release film 120 and the second release film 130 can protect the optical adhesive body 110. The first projection S of the protective film 140 1 The second projection S of the optical adhesive body 110 2 There is a non-overlapping area B between the protective film 140, that is, the size of the protective film 140 is larger than the size of the optical adhesive body 110. When the optical adhesive body 110 needs to be used, the first release film 120 can be taken away from the optical adhesive body 110 by peeling off the larger protective film 140 attached to the first release film 120. On the basis of ensuring the ease of peeling, there is no need to replace the first release film 120, avoiding the risk of contamination that may exist during the replacement process.

[0071] Please continue to combine Figures 6 to 8As shown, it should be noted that the first release film 120 is exemplarily a light release film, the second release film 130 is exemplarily a heavy release film, and the optical adhesive body 110 is exemplarily an OCA (Optically Clear Adhesive) optical adhesive. Among them, the optical adhesive body 110 can be used for bonding materials on touch screens to achieve capacitive touch sensing effects, and its requirements for cleanliness are very high. Therefore, when selecting the first release film 120 and the second release film 130, it is necessary to select optical-grade release films, and the cleanliness requirements for the first release film 120 and the second release film 130 are relatively high. In addition, in order to ensure that the first release film 120 and the second release film 130 can better protect the optical adhesive body 110, the uniformity requirements and reliability requirements of the release agent are also relatively high, so as to improve the tolerance to extreme environments such as high temperature and high humidity.

[0072] It should also be noted that, since the protective film 140 is attached to the side of the first release film 120 away from the optical adhesive body 110, and is not in direct contact with the optical adhesive body 110, the selection range of the material of the protective film 140 is relatively wide and is not limited here. For example, the protective film 140 can be a relatively cheap PET (Polyethyleneterephthalate) film. Combined with the above analysis, the uniformity of the release agent is required to be high, which also affects the peeling force between the first release film 120 and the optical adhesive body 110, and the second release film 130 and the optical adhesive body 110. Therefore, if the first release film 120 is replaced after cutting as described in the related art, it needs to be replaced with a light release film of the same quality, and the cost of a high-quality light release film is high. With the help of the low-priced protective film 140, the present application can not only reduce the possibility of contamination of the optical adhesive body 110 caused by peeling off the first release film 120, but also reduce costs.

[0073] like Figure 8 As shown, combined with Figure 6 In some embodiments, the non-overlapping region B surrounds the overlapping region A. In this way, the non-overlapping region B surrounding the overlapping region A can make the size of the protective film 140 in the circumferential direction larger than the size of the first release film 120, that is, any position in the circumferential direction of the protective film 140 can provide an easy peeling position for the operator or an external film tearing mechanism, so that the protective film 140 can easily remove the first release film 120 from the optical adhesive body 110.

[0074] Please continue reading Figure 6 and Figure 7In some embodiments, the release force between the protective film 140 and the first release film 120 is the first release force, and the release force between the optical adhesive body 110 and the first release film 120 is the second release force. The first release force is greater than the second release force. The first release force refers to the force required to separate the protective film 140 from the first release film 120, and the second release force refers to the force required to separate the optical adhesive body 110 from the first release film 120. By designing the first release force to be greater than the second release force, when the protective film 140 is peeled off, the first release film 120 can be easily taken away from the optical adhesive body 110, thereby reducing the possibility that the first release film 120 will remain on the optical adhesive body 110 when the protective film 140 is peeled off.

[0075] The inventor has found through research that when the ratio of the first release force to the second release force is more than five times, the effect of removing the first release film 120 is better. Based on this, in some embodiments, the ratio of the first release force to the second release force is greater than 5. Specifically, in some embodiments, the second release force is 3 g / inch-5 g / inch. When separating the first release film 120 from the optical adhesive body 110, if the second release force is too large, it may cause glue pulling, and if the second release force is too small, the bonding force is poor. When subjected to impact force during transportation, for example, the first release film 120 and the optical adhesive body 110 may be separated too easily, so that the protection of the optical adhesive body 110 by the first release film 120 fails, and the optical adhesive body 110 is contaminated.

[0076] It is understandable that the second release force includes, but is not limited to, 3 g / inch, 3.5 g / inch, 4 g / inch, 4.5 g / inch, or 5 g / inch. Specifically, in the embodiment of the present application, in combination with the actual size of the first release film 120, the first release gram of the first release film 120 ranges from 1 g to 6 g. It should be noted that, limited by the manufacturing process and manufacturing cost, the first release gram is also difficult to reduce to less than 1 gram. It is understandable that the first release gram range may be, but is not limited to, 1 g, 2 g, 3 g, 4 g, 5 g, or 6 g.

[0077] Furthermore, the first release force is greater than 25 g / inch. Thus, in combination with the numerical range of the second release force, the first release force is set to be greater than 25 g / inch, which can ensure that the first release force is more than five times the second release force, that is, the protective film 140 can be more easily removed from the first release film 120, while relieving the adhesive pulling condition that may be caused when the first release film 120 is separated from the optical adhesive body 110.

[0078] like Figure 6 and Figure 7As shown, in some embodiments, the release force between the protective film 140 and the first release film 120 is the first release force, and the release force between the optical adhesive body 110 and the second release film 130 is the third release force. The first release force is less than the third release force. The third release force refers to the force required to separate the optical adhesive body 110 from the second release film 130, and the first release force is less than the third release force, that is, the force required to separate the optical adhesive body 110 from the second release film 130 is greater than the force required to separate the first release film 120 from the protective film 140. It can be understood that when the first release film 120 is peeled off from the optical adhesive body 110 with the help of the protective film 140, the optical adhesive body 110 will not be taken away from the second release film 130.

[0079] In combination with some of the aforementioned embodiments, the second release force is smaller than the first release force, and the first release force is smaller than the third release force. In this way, when the optical adhesive body 110 needs to be used, the first release film 120 can be removed from the optical adhesive body 110 by peeling off the protective film 140, while reducing the possibility of removing the optical adhesive body 110 from the second release film 130 at the same time.

[0080] The inventor has found that, in combination with the actual size of the second release film 130, if the release weight of the second release film 130 is too small, the bonding force between the second release film 130 and the optical adhesive body 110 is too small, which may cause the second release film 130 to separate from the optical adhesive body 110 during production and transportation, and may also cause part of the optical adhesive body 110 to be taken away from the second release film 130 when the first release film 120 is taken away by the protective film 140. If the release weight of the second release film 130 is too large, the bonding force between the optical adhesive body 110 and the second release film 130 is too large, and after the optical adhesive body 110 is attached to the attached object, the second release film 130 is difficult to separate from the optical adhesive body 110, and even the optical adhesive body 110 may be deformed due to adhesive pulling. Specifically in the embodiment of the present application, the second release weight of the second release film 130 is in the range of 20 grams to 30 grams. It can be understood that the second release weight can be, but is not limited to, 20 grams, 22 grams, 24 grams, 26 grams, 28 grams or 30 grams.

[0081] Please refer again Figure 8 In some embodiments, the orthographic projection of the second release film 130 on the first plane R is the third projection S 3 The first projection S 1 Cover the third projection S 3 The first projection S 1 Cover the third projection S 3That is, the size of the protective film 140 is greater than or equal to the size of the second release film 130. Specifically in some embodiments, it is usually necessary to use an external film tearing mechanism to grab the protective film 140 to complete the peeling action. Setting a larger size of the protective film 140 can be easier for the external film tearing mechanism to grab, thereby increasing the ease of peeling.

[0082] like Figure 8 As shown, in some embodiments, the first projection S 1 The outer contour and the third projection S 3 The outer contour of the first projection S completely coincides. It can be understood that 1 With the third projection S 3 The outer contours of the Figure 6 , that is, the second release film 130 is the same size as the protective film 140. In this way, while it is easy for the external film tearing mechanism to grab the protective film 140, the cost of the protective film 140 can be reduced, and excessive cost increase due to the provision of an overly large protective film 140 can be avoided. In addition, in combination with some embodiments described later, in the cutting process, the first release film 120 and the optical adhesive body 110 are first cut off without cutting the second release film 130, and then the second release film 130 is cut to the required size through subsequent processes. After cutting the first release film 120 and the optical adhesive body 110, the present application attaches a protective film 140 of the same size as the second release film 130 to the first release film 120, and the second release film 130 and the protective film 140 can be cut at the same time through subsequent processes, without the need to cut the protective film 140 separately, thereby reducing the number of cutting processes and saving costs.

[0083] Please continue reading Figure 8 , and combined with Figure 6 In some embodiments, the third projection S 3 The outer contour and the second projection S 2 There is a first spacing L between the outer contours of the second projection S 2 With the third projection S 3 There is a first spacing L between the outer contours, which means that the size of the second release film 130 is larger than the size of the optical adhesive body 110. In this way, the ease of peeling the second release film 130 from the optical adhesive body 110 can be improved. Specifically, in some embodiments, the first spacing L is greater than 6 mm. In combination with some of the aforementioned embodiments, it is usually necessary to clamp or stick the second release film 130 with the help of the claws of an external gripping mechanism to fix it. With the help of the first spacing L, the size requirements of the external gripping mechanism can be met when gripping, and the grippers in the external gripping mechanism are prevented from interfering with the optical adhesive body 110. In addition, with the help of the first spacing L, the edges of the optical adhesive body 110 can also be protected to avoid damage or contamination to the optical adhesive body 110 caused by collisions that may occur during transportation.

[0084] See also Figure 6 In some embodiments, the thickness of the protective film 140 is defined as D 1 , the dimension D of the protective film 140 in the thickness direction 1 It can be understood that the dimension D of the protective film 140 in the thickness direction is 25 micrometers to 100 micrometers. 1 The thickness may be, but is not limited to, 25 microns, 50 microns, 75 microns or 100 microns. Since the protective film 140 is attached to the first release film 120 rather than directly contacting the optical adhesive body 110, the requirements for the protective film 140 are relatively loose. In consideration of cost, the thinner the protective film 140, the lower the cost. Therefore, in the embodiment of the present application, the dimension D of the protective film 140 in the thickness direction is 1 Of course, in some other embodiments, the size requirement of the protective film 140 can also be adaptively adjusted according to the external film tearing mechanism, which is not limited here.

[0085] Fig. 9 A schematic flow chart of a method for manufacturing an optical adhesive structure 100 in an embodiment of the present application is shown.

[0086] In combination with some of the following embodiments, it can be understood that the optical adhesive structure 100 is formed by processing a preform. The provided preform includes product forms such as an intermediate state (i.e., a semi-finished product) or a final state (i.e., a finished product), and the optical adhesive structure 100 includes product forms such as an intermediate state (i.e., a semi-finished product) or a final state (i.e., a finished product), and the preform is an intermediate state of the optical adhesive structure 100. That is, the optical adhesive structure 100 comes from at least a part of the preform. Since the focus of the embodiments of the present application is on the methods involved in some of the following embodiments, the relevant specific structures and related processes for forming the intermediate state or the final state are not repeated here.

[0087] Based on the same inventive concept, another aspect of the present application further provides a method for manufacturing an optical adhesive structure 100, such as Fig. 9 See Figures 6 to 8 , methods include:

[0088] S110, cutting the first release film 120 and the optical adhesive body 110 in the preform according to a preset size; the preform includes a first direction (such as Figure 6 The second release film 130, the optical adhesive body 110 and the first release film 120 are stacked (in the x-axis direction shown);

[0089] S120 , attaching the protective film 140 to the side of the first release film 120 away from the optical adhesive body 110 to form the optical adhesive structure 100 .

[0090] The plane perpendicular to the first direction is defined as the first plane R, and the orthographic projection of the protective film 140 on the first plane R is the first projection S 1 The orthographic projection of the optical adhesive body 110 on the first plane R is the second projection S 2 The first projection S 1 Cover the second projection S 2 , and the first projection S 1 With the second projection S 2 There is an overlapping area A and a non-overlapping area B.

[0091] In step S110, Figure 3 As shown, cutting refers to cutting the first release film 120 and the optical adhesive body 110 with the aid of a tool k so that the optical adhesive body 110 meets the preset size requirements. Figure 6 The x-axis direction shown is perpendicular to the first surface 111 of the optical adhesive body 110.

[0092] Please continue reading Figure 6 The preform is the optical adhesive structure 100 in the form of a roll provided by the raw material supplier. The thickness of the first release film 120 is defined as D 2 , define the thickness of the second release film 130 as D 3 For example, the thickness D of the first release film 120 is 2 The thickness D of the second release film 130 is 38 microns. 3 is 100 microns. It should be noted that the raw material supplier selects and matches the first release film 120 and the second release film 130 according to the characteristics of the optical adhesive body 110 provided by it, so as to avoid deformation of the optical adhesive body 110, such as depression, caused by the presence of foreign matter p on the surface of the first release film 120 or the second release film 130, resulting in defective optical adhesive body 110. When selecting, for a harder optical adhesive body 110, such as an optical adhesive body 110 with a Young's modulus of 0.16 MPa, a thinner release film with a thickness of 38 microns can be selected. For a softer optical adhesive body 110, such as an optical adhesive body 110 with a Young's modulus of less than 0.05 MPa, a thicker release film with a thickness of 50 microns or 75 microns can be selected, without limitation here.

[0093] Combination Figure 3 and Figure 6 As shown, in the cutting process, the first release film 120 and the optical adhesive body 110 are usually cut first, and then the second release film 130 is cut to the required size in the next process. The cutting accuracy of the cutting tool k can be controlled within 15 microns, and the thickness dimension D of the second release film 130 is 3The diameter of the second release film 130 is 100 microns. After cutting the first release film 120 and the optical adhesive body 110, the 15-micron knife marks on the second release film 130 will not affect the use of the production line, and even the second release film 130 can be made without knife marks by controlling the knife precision. Therefore, after cutting the first release film 120 and the optical adhesive body 110, the two have the same size, and the second release film 130 is not cut, that is, the size of the second release film 130 is not affected. Based on this, it is only necessary to select a larger protective film 140 to attach to the first release film 120 so that the first release film 120 can be more easily taken away from the optical adhesive body 110, and there is no need to perform other process processing on the second release film 130, thereby realizing the production of the optical adhesive structure 100 at a lower cost and a simpler process, and reducing the risk of contamination of the optical adhesive body 110.

[0094] By using the manufacturing method of the optical adhesive structure 100 provided by the present application, it is not necessary to peel off the first release film 120 from the optical adhesive body 110, and because the additional protective film 140 is larger in size, the protective film 140 can be easily grasped, and the first release film 120 can be taken away from the optical adhesive body 110 with the help of the protective film 140. The optical adhesive structure 100 manufactured by the method provided by the present application reduces the risk of contamination to the optical adhesive body 110, and the division of responsibilities is clearer.

[0095] The optical adhesive structure 100 provided in the embodiment of the present application protects the optical adhesive body 110 by means of the first release film 120 and the second release film 130, and a larger protective film 140 is attached to the first release film 120. When the optical adhesive body 110 needs to be used, the first release film 120 can be removed from the optical adhesive body 110 by peeling off the larger protective film 140 attached to the first release film 120. On the basis of ensuring the ease of peeling, there is no need to replace the first release film 120, thereby avoiding the risk of contamination that may exist during the replacement process. At the same time, since the protective film 140 does not need to be in direct contact with the optical adhesive body 110, the range of its material selection is relatively wide, so its cost is relatively low. Moreover, the size of the protective film 140 is set to be the same as the size of the second release film 130. In the subsequent cutting process, it is easy for the tool k to cut the protective film 140 and the second release film 130 at the same time, thereby reducing the number of cutting times in the process and saving costs. The manufacturing method of the optical adhesive structure 100 provided in the embodiment of the present application not only has a relatively simple manufacturing process, but also the manufactured optical adhesive body 110 does not require the step of replacing the first release film 120, thereby avoiding the contamination of the optical adhesive body 110 due to the presence of environmental foreign matter p during the replacement process. Furthermore, in the case where the optical adhesive body 110 is contaminated due to, for example, the presence of inter-film foreign matter p in the preform, or the release agent remains in the optical adhesive body 110 due to non-compliant conditions, the division of responsibilities is also clearer.

[0096] It should be noted that some of the technical solutions described above can be implemented as independent embodiments in the actual implementation process, or they can be combined with each other and implemented as combined embodiments. Some of the technical solutions described above are exemplary solutions. How to combine them for implementation can be selected according to actual needs, and the embodiments of the present application are not specifically limited. In addition, when the above-mentioned embodiments of the present application are described, different embodiments are described in the corresponding order based on the idea of ​​convenient description, such as the order preset according to the requirements in the actual implementation process, rather than limiting the execution order between different embodiments. Accordingly, in the actual implementation process, if it is necessary to implement multiple embodiments provided by the embodiments of the present application, it is not necessarily necessary to follow the execution order provided when the embodiments are described in the present invention, but the execution order between different embodiments can be arranged according to the needs.

[0097] It should be understood that although Fig. 9 The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Fig. 9 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0098] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0099] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A method for manufacturing an optical adhesive structure, characterized in that: The method comprises: A preform is provided; the preform comprises a second release film, an optical adhesive body and a first release film stacked along a first direction; Cutting the first release film and the optical adhesive body in the preform into a preset size so that the first release film and the optical adhesive body have the same size; Attaching a protective film to a side of the first release film away from the optical adhesive body to form an optical adhesive structure; The plane perpendicular to the first direction is defined as the first plane, the orthographic projection of the protective film on the first plane is the first projection, the orthographic projection of the optical adhesive body on the first plane is the second projection, and the orthographic projection of the second release film on the first plane is the third projection; the first projection covers the second projection and the third projection, and there is an overlapping area and a non-overlapping area between the first projection and the second projection, the non-overlapping area surrounds the overlapping area, there is a first spacing between the outer contour of the third projection and the outer contour of the second projection, and the outer contour of the first projection completely overlaps with the outer contour of the third projection; The release force between the protective film and the first release film is a first release force, the release force between the optical adhesive body and the first release film is a second release force, and the release force between the optical adhesive body and the second release film is a third release force; the first release force is greater than the second release force and less than the third release force.

2. An optical adhesive structure, characterized in that: The optical adhesive structure is manufactured by the method for manufacturing an optical adhesive structure according to claim 1; the optical adhesive structure comprises: The optical adhesive body has a first surface and a second surface disposed opposite to each other; A first release film and a second release film are attached to the first surface and the second surface respectively; and The protective film is attached to a side of the first release film that is away from the optical adhesive body.

3. The optical adhesive structure according to claim 2, characterized in that: The ratio of the first release force to the second release force is greater than 5.

4. The optical adhesive structure according to claim 3, characterized in that: The second release force is 3 g / inch-5 g / inch, and the first release force is greater than 25 g / inch.

5. The optical adhesive structure according to claim 2, characterized in that: The first spacing is greater than 6 mm.

6. The optical adhesive structure according to claim 2, characterized in that: The protective film has a size in a thickness direction of 25 micrometers to 100 micrometers.

7. The optical adhesive structure according to claim 2, characterized in that: The protective film is a polyethylene terephthalate film.

8. The optical adhesive structure according to claim 2, characterized in that: The optical adhesive body is OCA optical adhesive.

9. The optical adhesive structure according to claim 2, characterized in that: The thickness of the first release film is 38 microns.

10. The optical adhesive structure according to claim 2, characterized in that: The thickness of the second release film is 100 micrometers.

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