Optical components and bonding methods for their applications

Abstract

The present application relates to the field of display technology, and an embodiment of the present application provides a bonding method for an optical element and its application. In the bonding method for the above-mentioned optical element and its application, the optical element includes at least a substrate and a film layer provided on the substrate. By differentiating the film layer density at different areas corresponding to the bonding surface of the lens, when heated by an infrared heating device, the heat reaching the optical film in the middle area by means of the first part is less than the heat reaching the optical film in the edge area by means of the second part, so that the fluidity of the optical film in the edge area is greater than the fluidity of the optical film in the middle area. In this way, the curvature characteristics of the middle area and the edge area of ​​the bonding surface can be combined to achieve a more uniform bonding effect between the optical film and the lens.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical element and a bonding method thereof. Background Art

[0002] Typically, optical films need to be laminated onto lenses to meet the needs of different display modules. Related technologies increase the lamination temperature to soften the optical film, allowing it to adhere to the lens. This process can easily result in optical defects. Summary of the Invention

[0003] Based on this, it is necessary to provide an optical element and a bonding method thereof to improve the optical defects of the lens.

[0004] According to one aspect of the present application, an embodiment of the present application provides a bonding method for bonding an optical film and a lens, wherein the lens has a bonding curved surface for bonding to the optical film, the bonding curved surface having a middle region and an edge region disposed outside the middle region, wherein the maximum curvature of the middle region is less than the minimum curvature of the edge region; the bonding method comprises:

[0005] An optical element is disposed on a side of the optical film facing away from the lens, and the optical element, the optical film, and the lens are aligned with each other; the optical element comprises a substrate and a film layer disposed on the substrate, the film layer having a first portion corresponding to the middle region and a second portion corresponding to the edge region, the minimum film layer density of the first portion being greater than the maximum film layer density of the second portion;

[0006] Infrared rays are emitted toward the optical element through an infrared heating device to bond the optical film to the bonding curved surface; the infrared heating device is located on a side of the optical element away from the optical film.

[0007] In one embodiment, the intermediate region has a varying curvature;

[0008] The film density of the first portion decreases as the curvature of the corresponding portion of the middle region increases.

[0009] In one embodiment, the edge region has a varying curvature;

[0010] The film density of the second portion decreases as the curvature of the corresponding portion of the edge region increases.

[0011] In one embodiment, the bonding method further includes evacuating the optical film and the lens during the process of emitting infrared rays.

[0012] In one embodiment, the substrate has a first surface facing the optical film and a second surface facing away from the optical film;

[0013] Wherein, the film layer is provided on the first surface; and / or, the film layer is provided on the second surface.

[0014] In one embodiment, the substrate is made of glass.

[0015] In one embodiment, the film layer is made of infrared absorbing material.

[0016] In one embodiment, the material of the film layer is one of nano-tungsten bronze, polydopamine, nano-copper sulfide, nano-antimony tin oxide, PCE-10, PDTP-DFBT, and PSBT-BT.

[0017] In one embodiment, the optical film is a multi-layer structure.

[0018] In one embodiment, the optical film includes a film body and an optical adhesive layer;

[0019] The optical adhesive layer is arranged on a side of the film body facing the lens.

[0020] In one embodiment, the optical film further comprises a carrier film;

[0021] The carrying film is arranged on a side of the film body facing away from the lens.

[0022] In one embodiment, the optical film is any one of a polarizing film, a quarter wave plate, a half wave plate, an anti-reflection film, an anti-scratch film, a light scattering film, and an anti-fog film; and / or

[0023] The surface shape of the fitting curved surface is any one of a free-form surface, an ellipsoidal surface, a spherical surface, a paraboloid, and an arc surface; and / or

[0024] The bonding curved surface is a concave surface that is concave in a direction away from the optical film.

[0025] According to another aspect of the present application, an embodiment of the present application provides an optical element, which is applied to the bonding method in any of the above embodiments; the optical element includes the substrate and the film layer, and the film layer is provided on at least one side of the substrate.

[0026] In the aforementioned optical element and bonding method thereof, the optical element comprises at least a substrate and a film layer disposed on the substrate. The film layer density is differentiated in different regions corresponding to the bonding curved surface of the lens. Specifically, the minimum film layer density in a first portion of the film layer corresponding to the middle region of the bonding curved surface is greater than the maximum film layer density in a second portion of the film layer corresponding to the edge region of the bonding curved surface. When heated by an infrared heating device, the amount of heat reaching the optical film in the middle region via the first portion is less than the amount of heat reaching the optical film in the edge region via the second portion. This results in greater fluidity of the optical film in the edge region than in the middle region. In this way, the curvature characteristics of the middle and edge regions of the bonding curved surface can be combined to achieve a more uniform bonding effect between the optical film and the lens.

[0027] Additional aspects and advantages of the embodiments of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the embodiments of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to represent the same components. In the drawings:

[0029] Figure 1 Schematic diagram of the structure of a display module in an embodiment of the related art.

[0030] Figure 2a-2b FIG. 1 is a schematic diagram of a display module imaging breakdown diagram according to an embodiment of the related art.

[0031] Figure 3a-Figure 3b Schematic diagram of the folds of an optical film in a display module according to another embodiment of the related art.

[0032] Figure 4 FIG. 1 is a schematic diagram of bubbles appearing in a display module according to another embodiment of the related art.

[0033] Figure 5 Schematic diagram of the bonding process in one embodiment of the present application.

[0034] Figure 6 Schematic diagram of the structure of a lens in one embodiment of the present application.

[0035] Figure 7 Schematic diagram of the process of the bonding method in one embodiment of the present application.

[0036] Figure 8 Schematic diagram of the structure of an optical element at one viewing angle in one embodiment of the present application.

[0037] Figure 9 Schematic diagram of the structure of the optical element at another viewing angle in one embodiment of the present application.

[0038] Figure 10 This is a schematic structural diagram of an optical element in another embodiment of the present application.

[0039] Figure 11 This is a schematic structural diagram of an optical element in another embodiment of the present application.

[0040] Figure 12 Schematic diagram of the structure of an optical film in one embodiment of the present application.

[0041] Figure 13a-13b Schematic diagram of an imaging test of a display module according to an embodiment of the present application.

[0042] Figure 14a-14b This is a schematic diagram of a test of a display module according to an embodiment of the present application.

[0043] Description of reference numerals:

[0044] 10. Display module, 11. Lens, 12. Optical film, z0: wrinkle area, B: bubble;

[0045] 100. Display module, 110. Optical film, 111. Film body, 112. Optical adhesive layer, 120. Lens, t1. Bonding curved surface, z1. Middle area, z2. Edge area, 200. Optical element, 210. Substrate, m1. First surface, m2. Second surface, 220. Film layer, p1. First part, p2. Second part, 300. Infrared heating device, 400. Mounting part, F1. First direction. DETAILED DESCRIPTION

[0046] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0047] In the description of this application, it should be understood that if 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", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0048] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0049] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0050] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0051] It should be noted that if 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 an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0052] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0053] Figure 1 A structural diagram of a display module 10 in an embodiment of the related art is shown; for ease of explanation, only contents related to the embodiment of the related art are shown.

[0054] In a related art embodiment, please refer to Figure 1 The display module 10 includes a lens 11 and an optical film 12 disposed on the lens 11. The bonding of the optical film 12 to the lens 11 determines the imaging quality of the display module 10. During the bonding process, improper bonding procedures and bonding temperatures can lead to excessive stretching and deformation of the optical film 12 or optical adhesive, which can lead to optical failure and reliability issues in the display module 10. The optical film 12 is typically softened by increasing the bonding temperature to ensure proper bonding between the optical film 12 and the lens 11.

[0055] Figure 2a-2b A schematic diagram showing an imaging breakdown of a display module 10 according to an embodiment of the related art is shown; Figure 3a-Figure 3b A schematic diagram showing wrinkles of an optical film 12 in a display module 10 according to another embodiment of the related art is shown;

[0056] Figure 4 A schematic diagram showing bubbles b appearing in a display module 10 according to another embodiment of the related art is shown; for ease of explanation, only content related to the embodiment of the related art is shown. Figure 2a 、 Figure 2b 、 Figure 3a and Figure 3b Both show schematic diagrams of local imaging.

[0057] In the above process, the inventors of the present application noticed that, taking the lens 11 as a curved lens as an example, Figure 2a-2b As shown in FIG, the position of high curvature is prone to image breakage, which in turn leads to a reduction in the viewing area of ​​the display module 10. Furthermore, as Figure 3a-Figure 3bAs shown, the optical film 12 has obvious wrinkles in the optical imaging, forming a wrinkle area z0, as shown in FIG. Figure 4 As shown, air bubbles b appear at the joint, which causes optical defects in the display module 10 and poor imaging quality.

[0058] The inventors of this application have discovered that tensile stress concentrates in the optical film 12 at locations with high curvature. After softening due to high temperatures, the stress is released and the optical film 12 deforms. If the bonding force is insufficient, portions of the optical film 12 may separate from the lens 11, resulting in wrinkles and bubbles (b). This means that during the bonding process, the optical film 12 experiences at least localized stress concentration.

[0059] Based on this, and to at least solve some of the above problems, the embodiments of the present application provide a lamination method that can adjust the elastic modulus of the optical film 12 to improve the aforementioned problems of the optical film 12. The lamination method is further described below with reference to the relevant drawings and some embodiments.

[0060] Figure 5 A structural schematic diagram of the bonding process in one embodiment of the present application is shown; Figure 6 A schematic structural diagram of a lens 120 in an embodiment of the present application is shown; for ease of explanation, only the content related to the embodiment of the present application is shown. Figure 6 The dashed lines in FIG. 1 are only used to distinguish between the illustrated middle region z1 and the edge region z2 .

[0061] In some embodiments, please refer to Figure 5 and Figure 6 The present invention provides a bonding method for bonding an optical film 110 and a lens 120 to form a display module 100. The lens 120 has a bonding curved surface t1 for bonding to the optical film 110. The bonding curved surface t1 has a middle region z1 and an edge region z2 disposed outside the middle region z1. The maximum curvature of the middle region z1 is smaller than the minimum curvature of the edge region z2.

[0062] It can be understood that, compared to the middle area z1, the edge area z2 is located outside the middle area z1. That is, the edge area z2 can be arranged around the middle area z1, or can be located outside the middle area z1 along a certain direction. Figure 6For example, the situation where the two opposite sides of the middle area z1 are edge areas z2 is illustrated. The division of the middle area z1 and the edge area z2 is determined according to the specific bonding surface t1 of the lens 120. The bonding surface t1 is a surface with a curved surface, and the curvature of the middle area z1 of the bonding surface t1 is generally smaller than the curvature of the edge area z2 to form a curved surface. Exemplarily, the bonding surface t1 is a concave surface that is concave in the direction away from the optical film 110. The curvature of the middle area z1 may be uniform or non-uniform, and the curvature of the edge area z2 may be uniform or non-uniform, and can be selected according to the specific usage situation. The embodiment of the present application does not impose specific restrictions on this.

[0063] Figure 7 A schematic flow chart of a bonding method in one embodiment of the present application is shown; Figure 8 FIG2 shows a schematic structural diagram of an optical element 200 at a viewing angle in an embodiment of the present application; Figure 9 A schematic structural diagram of the optical element 200 at another viewing angle in an embodiment of the present application is shown; for ease of explanation, only the content related to the embodiment of the present application is shown. Figure 9 The perspective relative to Figure 8 From the perspective of Figure 8 A bird's-eye view from above. Figure 9 The dotted lines are only used to distinguish the areas of the optical element 200 corresponding to the lens 120.

[0064] Please continue to refer to Figure 5 and Figure 6 , combined with reference Figures 7 to 9 , the laminating method comprises the following steps:

[0065] S110, disposing an optical element 200 on a side of the optical film 110 facing away from the lens 120, with the optical element 200, the optical film 110, and the lens 120 aligned with each other; the optical element 200 includes a substrate 210 and a film layer 220 disposed on the substrate 210, the film layer 220 having a first portion p1 corresponding to a middle region z1 and a second portion p2 corresponding to an edge region z2, the minimum film layer density of the first portion p1 being greater than the maximum film layer density of the second portion p2;

[0066] Specifically, if Figure 5 As shown, the optical element 200, the optical film 110 and the lens 120 are sequentially arranged along the first direction F1. Figure 9The first part p1 corresponds to the middle area z1, and the film density of the first part p1 can be uniform or non-uniform. The second part p2 corresponds to the middle area z1, and the film density of the second part p2 can be uniform or non-uniform, as long as the minimum film density of the first part p1 is greater than the maximum film density of the second part p2, that is, as a whole, the film density of the first part p1 is greater than the film density of the second part p2. This embodiment of the present application does not impose any specific restrictions on this. Figure 6 For example, in the case where the two sides of the middle area z1 are edge areas z2, combined with reference Figure 9 , the two opposite sides of the first part p1 are the second parts p2. That is, the first part p1 and the middle area z1 are in one-to-one correspondence, and the second part p2 and the edge area z2 are in one-to-one correspondence.

[0067] S120 , emitting infrared rays toward the optical element 200 through the infrared heating device 300 to bond the optical film 110 to the bonding curved surface t1 ; the infrared heating device 300 is located on a side of the optical element 200 facing away from the optical film 110 .

[0068] Specifically, with reference to Figure 5 The infrared heating device 300, optical element 200, optical film 110, and lens 120 are sequentially arranged along the first direction F1. Compared to conventional heating methods using heat radiation from a heat source, the infrared heating device 300 can improve the overall high temperature of the equipment environment and facilitate the control of the fluidity of the optical film 110. It can be understood that the optical film 110 located at a location with a high curvature receives more heat, which improves its fluidity and allows it to adhere more smoothly to the lens 120. The optical film 110 located at a location with a low curvature receives less heat, which reduces its fluidity, thereby improving the image distortion caused by excessive stretching of the optical film 110.

[0069] Thus, the infrared light emitted by the infrared heating device 300 passes through the optical element 200 and reaches the optical film 110. Given the different film densities of the first portion p1 and the second portion p2 of the film layer 220 of the optical element 200, the amount of heat reaching the optical film 110 in the middle region z1 via the first portion p1 is less than the amount of heat reaching the optical film 110 in the edge region z2 via the second portion p2. This results in the fluidity of the optical film 110 in the edge region z2 being greater than that in the middle region z1. This allows the curvature characteristics of the middle region z1 and the edge region z2 of the bonding curved surface t1 to be combined to achieve a more uniform bonding effect between the optical film 110 and the lens 120. This reduces the tensile force on the optical film 110, improves the problems encountered in the aforementioned related art, and achieves a smoother and more uniform bonding effect between the optical film 110 and the lens 120.

[0070] In some embodiments, please refer to Figure 5 、 Figure 8 and Figure 9 , the middle region z1 has a variable curvature, and the film layer density of the first portion p1 decreases as the curvature of the corresponding portion of the middle region z1 increases. That is, the curvature of the middle region z1 is not uniform, and the film layer density of the first portion p1 changes as the curvature of the middle region z1 changes. In other words, the film layer density of the first portion p1 corresponding to a position with a relatively high curvature of the middle region z1 is lower than the film layer density of the first portion p1 corresponding to a position with a relatively low curvature of the middle region z1. In this way, when the film layer density of the first portion p1 is set according to the curvature of the middle region z1, the surface characteristics of the bonding surface t1 can be better combined, so that the bonding of the optical film 110 in the middle region z1 of the bonding surface t1 is more uniform, and a better bonding effect is obtained.

[0071] In some embodiments, please refer to Figure 5 、 Figure 8 and Figure 9, the edge region z2 has a variable curvature, and the film density of the second portion p2 decreases as the curvature of the corresponding portion of the edge region z2 increases. In other words, the curvature of the edge region z2 is not uniform, and the film density of the second portion p2 changes as the curvature of the edge region z2 changes. In other words, the film density of the second portion p2 corresponding to a position with a relatively high curvature of the edge region z2 is lower than the film density of the second portion p2 corresponding to a position with a relatively low curvature of the edge region z2. In this way, when the film density of the second portion p2 is set according to the curvature of the edge region z2, the surface characteristics of the bonding surface t1 can be better combined, so that the bonding of the optical film 110 at the edge region z2 of the bonding surface t1 is more uniform, and a better bonding effect is obtained.

[0072] It can be understood that according to the contents illustrated in some of the above embodiments, by combining the curvature changes of the edge area z2 and the middle area z1, that is, according to the surface characteristics of the bonding surface t1, the areas of the film layer 220 of the optical element 200 change following the curvature of the bonding surface t1, which can further improve the bonding effect between the optical film 110 and the lens 120.

[0073] In some embodiments, the bonding method further includes evacuating the optical film 110 and lens 120 during the infrared emitting process. Bonding the optical film 110 and lens 120 in a vacuum environment can further reduce the generation of bubbles. Furthermore, the pressure differential created by the vacuum environment further facilitates the bonding process between the optical film 110 and lens 120.

[0074] Figure 10 2 is a schematic structural diagram of an optical element 200 in another embodiment of the present application; Figure 11 A schematic structural diagram of an optical element 200 in another embodiment of the present application is shown; for ease of explanation, only the content related to the embodiment of the present application is shown.

[0075] In some embodiments, please refer to Figure 10 and Figure 11 The substrate 210 has a first surface m1 facing the optical film 110 and a second surface m2 facing away from the optical film 110. That is, the first surface m1 and the second surface m2 are arranged opposite to each other along the first direction F1. The film layer 220 is arranged on the first surface m1; and / or the film layer 220 is arranged on the second surface m2. Figure 10 As an example, the film layer 220 is provided on the first surface m1. Figure 11 For example, the film layer 220 is provided on the first surface m1 and the second surface m2. Figure 8As an example, the film layer 220 is shown as being disposed on the second surface m2. The configuration may be made according to specific usage conditions, and the present application does not impose any specific limitation thereto.

[0076] It is understandable that the density of the film layer at each corresponding location on the film layer 220 provided on the first surface m1 and / or the second surface m2 is adjusted following the curvature of the fitting surface t1. Please refer to the contents illustrated in some of the aforementioned embodiments and will not be repeated here.

[0077] In this way, the configuration of the film layer 220 can be flexibly selected according to usage requirements.

[0078] In some embodiments, the film layer 220 can be formed by spraying, vacuum magnetron sputtering, vacuum evaporation, chemical vapor deposition, etc. The substrate 210 can be transparent glass. For example, the substrate 210 can be a lens or a plane mirror. More specifically, the material of the film layer 220 is an infrared absorbing material. The material of the film layer 220 can be an organic material or an inorganic material. In this way, the heat of infrared rays passing through the film layer 220 can be more effectively controlled. Exemplarily, the material of the film layer 220 can be one of nano tungsten bronze, polydopamine, nano copper sulfide, nano antimony tin oxide, PCE-10, PDTP-DFBT, and PSBT-BT. Among them, PCE-10, PDTP-DFBT, and PSBT-BT are all organic optoelectronic materials. PCE-10 is a narrow bandgap polymer donor synthesized by introducing 2-ethylhexyl-thiophene into the side chain of the BDT unit in PTB7. PDTP-DFBT is a P-type polymer donor material, formed by copolymerizing bithienopyran units and difluorobenzothiadiazole units. PSBT-BT is a low-bandgap polymer semiconductor and a P-type polymer donor material, exhibiting a large absorption band in the visible spectrum, extending its absorption into the near-infrared region. For example, when the film layer 220 is made of nano-tungsten bronze, the film layer 220 has a stronger infrared absorption capability, making it easier to control the infrared heat reaching the optical film 110.

[0079] In some embodiments, please refer to Figure 5 The optical element 200 can be mounted on a mounting member 400, which can be a frame or a bracket. This makes it easier to mount the optical element 200 and adjust the position of the optical element 200 using the mounting member 400.

[0080] Figure 12 A schematic structural diagram of an optical film 110 in an embodiment of the present application is shown; for ease of explanation, only the contents related to the embodiment of the present application are shown.

[0081] In some embodiments, please refer to Figure 12The optical film 110 has a multi-layer structure. Specifically, the optical film 110 includes a film body 111 and an optical adhesive layer 112. The optical adhesive layer 112 is disposed on the side of the film body 111 facing the lens 120. The optical adhesive layer 112 can be a solid UV optical adhesive layer. The optical film 110 can also include a carrier film, which is disposed on the side of the film body 111 facing away from the lens 120. The carrier film can be used to support the film body 111 and the optical adhesive layer 112. In this way, the structure of the optical film 110 can be flexibly set according to actual usage requirements.

[0082] In some embodiments, the optical film 110 is any one of a polarizing film, a quarter-wave plate, a half-wave plate, an anti-reflection film, an anti-scratch film, a light-scattering film, and an anti-fog film; and / or the bonding curved surface t1 is any one of a free-form surface, an ellipsoidal surface, a spherical surface, a paraboloid, and a curved surface; and / or the bonding curved surface t1 is a concave surface that is concave away from the optical film 110. In this manner, the desired type of optical film 110 can be bonded to the bonding curved surface t1 of the lens 120 according to the intended use.

[0083] Based on the same invention concept, please continue to refer to 8 to Figure 11 The present application also provides an optical element 200 for use in the bonding method described in any of the above embodiments. The optical element 200 includes a substrate 210 and a film layer 220, with the film layer 220 disposed on at least one side of the substrate 210. The specific implementation of the optical element 200 can be found in the aforementioned embodiments, and its advantages can also be found in the aforementioned embodiments, which will not be further elaborated here.

[0084] It should be noted that the display module 100 produced using the bonding method provided in the embodiments of this application can be applied to fields such as mobile phones, bionic electronics, electronic skin, wearable devices, vehicle-mounted devices, Internet of Things devices, and artificial intelligence devices. Electronic devices equipped with this display module 100 can include mobile phones, tablets, PDAs, iPods, smart watches, laptops, televisions, monitors, and the like. The choice of display module 100 can be based on specific application requirements and is not specifically limited by the embodiments of this application.

[0085] Figure 13a-13b 1 is a schematic diagram showing an imaging test of a display module 100 according to an embodiment of the present application; Figure 14a-14b FIG2 is a schematic diagram showing a test of a display module 100 according to an embodiment of the present application. For ease of explanation, only the contents related to the embodiment of the present application are shown. Figure 13a 、 Figure 13b 、 Figure 14a and Figure 14b Both show schematic diagrams of local imaging.

[0086] like Figure 13a 、 Figure 13b 、 Figure 14a and Figure 14b As shown, the display module 100 manufactured by the bonding method provided in the embodiment of the present application was subjected to appearance testing and optical testing. It can be seen that the imaging is complete and the optical film 110 has no wrinkles and no reliability bubbles.

[0087] In summary, in the embodiments of the present application, by providing different film densities in different portions of the film layer 220 in the optical element 200, different amounts of heat are delivered to different areas of the optical film 110 surface during infrared heating. This in turn adjusts the fluidity of different areas of the optical film 110 to adapt to areas of varying curvature on the bonding curved surface t1 of the lens 120, thereby improving the bonding effect between the optical film 110 and the lens 120 and achieving a more uniform bonding. During this process, since the deformation capacity and fluidity of the optical film 110 are related to the degree of heat exposure, areas that are more heated are more likely to deform significantly, thereby alleviating the aforementioned issue of damage to the optical film 110. Furthermore, when the bonding area of ​​the display module 100 is relatively small, the embodiments of the present application, by providing film layers 220 with different film densities on the substrate 210 of the optical element 200, facilitates zoned heating control of the smaller bonding area, thereby alleviating the issue of difficulty heating the smaller bonding area. In addition, the use of infrared heating not only has high heating efficiency and can alleviate the problem of excessively high temperatures in the vacuum chamber used during bonding, but also does not damage the molecular structure of the optical film 110, allowing the optical film 110 to maintain a certain degree of viscosity, improving the wetting effect of the optical film 110 at the edge of the lens 120, and increasing the adhesion of the optical film 110 at the edge, thereby reducing the occurrence of bubbles and improving bonding reliability. As a result, the display module 100 produced by the bonding method provided in the embodiment of the application has high imaging quality and high reliability.

[0088] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above 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.

[0089] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A bonding method for bonding an optical film and a lens, characterized in that: The lens has a bonding curved surface for bonding to the optical film, the bonding curved surface is a concave surface that is concave in a direction away from the optical film, the bonding curved surface has a middle area and an edge area arranged outside the middle area, and the maximum curvature of the middle area is smaller than the minimum curvature of the edge area; the bonding method includes: An optical element is disposed on a side of the optical film facing away from the lens, and the optical element, the optical film, and the lens are aligned with each other; the optical element comprises a substrate and a film layer disposed on the substrate, the film layer having a first portion corresponding to the middle region and a second portion corresponding to the edge region, the minimum film layer density of the first portion being greater than the maximum film layer density of the second portion; Infrared rays are emitted toward the optical element through an infrared heating device to bond the optical film to the bonding curved surface; the infrared heating device is located on a side of the optical element away from the optical film.

2. The laminating method according to claim 1, wherein: The intermediate region has a varying curvature; The film density of the first portion decreases as the curvature of the corresponding portion of the middle region increases.

3. The laminating method according to claim 1, wherein: The edge region has a varying curvature; The film density of the second portion decreases as the curvature of the corresponding portion of the edge region increases.

4. The laminating method according to any one of claims 1 to 3, characterized in that: The bonding method further includes vacuuming the optical film and the lens during the infrared ray emission process.

5. The laminating method according to any one of claims 1 to 3, characterized in that: The substrate has a first surface facing the optical film and a second surface facing away from the optical film; Wherein, the film layer is provided on the first surface; and / or, the film layer is provided on the second surface.

6. The laminating method according to any one of claims 1 to 3, characterized in that: The substrate is made of glass.

7. The laminating method according to any one of claims 1 to 3, characterized in that: The material of the film layer is infrared absorbing material.

8. The laminating method according to claim 7, characterized in that: The material of the film layer is one of nano-tungsten bronze, polydopamine, nano-copper sulfide, nano-antimony tin oxide, PCE-10, PDTP-DFBT, and PSBT-BT.

9. The laminating method according to any one of claims 1 to 3, characterized in that: The optical film has a multi-layer structure.

10. The laminating method according to claim 9, characterized in that: The optical film comprises a film body and an optical adhesive layer; The optical adhesive layer is arranged on a side of the film body facing the lens.

11. The laminating method according to claim 10, characterized in that: The optical film further comprises a carrier film; The carrying film is arranged on a side of the film body facing away from the lens.

12. The laminating method according to any one of claims 1 to 3, characterized in that: The optical film is any one of a polarizing film, a quarter wave plate, a half wave plate, an anti-reflection film, an anti-scratch film, a light scattering film, and an anti-fog film; and / or The surface shape of the fitting curved surface is any one of a free-form surface, an ellipsoidal surface, a spherical surface, a paraboloid, and an arc surface.

13. An optical element, characterized in that: Applied to the bonding method according to any one of claims 1 to 12; the optical element comprises the substrate and the film layer, and the film layer is provided on at least one side of the substrate.

Images