Preparation method of under-screen fingerprint unlocking film

Abstract

The invention discloses a preparation method of an under-screen fingerprint unlocking film. The preparation method comprises the following steps: S1, coating optical cement on one side of a release film through roller coating equipment; s2, covering a layer of release film on the release film coated with the optical cement; s3, coating silica gel on the SRF film layer through roller coating equipment; s4, covering a layer of release film on the SRF film layer coated with silicon to obtain a base layer film; s5, tearing off the release film on one side of the pre-coating layer, and covering with a protective film layer; and S6, tearing off the release film on the other side of the pre-coating layer, and covering the pre-coating layer with the protective film layer on the base layer film to obtain the under-screen fingerprint unlocking film. In the application, the silica gel layer or the optical adhesive layer is laid through the roller coating equipment, so that the processing efficiency can be improved, the thickness of the silica gel layer or the optical adhesive layer can be accurately controlled, the laid silica gel layer or optical adhesive layer is uniform, tight combination of all layers of materials is facilitated, and the overall performance and stability of the film are improved; and the optical performance of the film is improved.

Description

Technical Field

[0001] This application relates to the technical field of fingerprint unlocking film preparation, and particularly relates to a method for preparing an in-screen fingerprint unlocking film. Background Art

[0002] With the progress of technology and the popularity of smart phones, people have put forward higher requirements for the security and convenience of mobile phones. As an emerging unlocking method, the in-screen fingerprint unlocking technology can achieve fast and accurate fingerprint recognition, enhancing the security of mobile phones and providing a better user experience. In addition, with the popularity of mobile payment, the fingerprint unlocking technology has also been widely applied in the financial field. The research and development of the in-screen fingerprint unlocking film preparation technology can not only meet the needs of the mobile phone market, but also be applied to the financial payment field to improve the security and convenience of payment.

[0003] The principle of the optical fingerprint unlocking film is as follows: when a finger presses the screen, the OLED screen emits light to illuminate the finger area, and the reflected light illuminating the fingerprint passes through the gaps between the screen pixels and returns to the sensor closely attached under the screen. The obtained fingerprint image is compared with the image initially entered into the mobile phone, and finally, identification and judgment are carried out.

[0004] The optical in-screen fingerprint unlocking film mainly consists of a release film, an SRF film layer, and a protective film layer. A colloid is also provided between adjacent two film layers. In the existing preparation process of the in-screen fingerprint unlocking film, most of them lay the colloid on the film layer by means of extrusion coating. The extrusion coating method has low efficiency and is prone to the problem of uneven colloid.

[0005] Based on this, it is necessary to propose a method for preparing an in-screen fingerprint unlocking film to improve the colloid laying efficiency and colloid uniformity, which has become an important technical problem to be solved urgently. Summary of the Invention

[0006] This application provides a method for preparing an in-screen fingerprint unlocking film, aiming to solve the problem that in the existing preparation process of the in-screen fingerprint unlocking film in the prior art, most of them lay the colloid on the film layer by means of extrusion coating, and the extrusion coating method has low efficiency and is prone to the problem of uneven colloid.

[0007] To achieve the above object, the present application proposes a method for preparing an under-screen fingerprint unlocking film, and the preparation method is as follows: S1. Coat an optical adhesive on one side of a release film through a roll coating device and perform high-temperature curing; S2. Cover another release film on the release film coated with the optical adhesive and perform aging and fixing to obtain a pre-coated layer; S3. Coat silica gel on an SRF film layer through a roll coating device and perform high-temperature curing; S4. Cover a release film on the SRF film layer coated with silica gel to obtain a base film; S5. Tear off the release film on one side of the pre-coated layer and cover a protective film layer; S6. Tear off the release film on the other side of the pre-coated layer, and cover the pre-coated layer with the protective film layer on the base film to obtain an under-screen fingerprint unlocking film.

[0008] In some embodiments, the roll coating device includes: a machine base; a first coating roller rotatably arranged on the machine base; a first coating layer arranged on the outer peripheral surface of the first coating roller; a coating table; a fixing table arranged on the coating table, and a receiving cavity for receiving film layer materials is arranged on the fixing table; two fixing end plates respectively arranged at both ends of the fixing table.

[0009] In some embodiments, the fixing end plate further includes: a high-level surface arranged at the bottom end of the fixing end plate; a convex surface connecting the high-level surface on the side away from the end of the film layer, and a groove surface adapted to the convex surface is arranged on the fixing table; a low-level surface, and the other side of the convex surface is connected to the low-level surface.

[0010] In some embodiments, the fixing end plate further includes: a plurality of reinforcing grooves, and the convex surface and the low-level surface are both provided with reinforcing grooves at intervals.

[0011] In some embodiments, it further includes: two side plates respectively arranged on both sides of the fixing table; a first positioning groove for positioning and fixing the fixing end plate is arranged on the side plate.

[0012] In some embodiments, it further includes: Side protrusions are arranged on the opposite sides of the two side plates.

[0013] In some embodiments, it further includes: A second positioning groove for positioning and fixing the fixing table is arranged on the coating table.

[0014] In some embodiments, it further includes: An adhesive tank is arranged on the machine base; A second coating roller rotatably arranged on the machine base; A second coating layer is arranged on the outer peripheral surface of the second coating roller, and a part of the generatrix of the rotary contour of the second coating layer is located in the adhesive tank; A coating drive is arranged on the machine base, and the coating drive is connected to the second coating roller; The third glue - applying roller is rotatably arranged on the machine base. The third glue - applying roller contacts the second coating layer and the first coating layer, and the outer peripheral surface of the third glue - applying roller is provided with reticulate grooves.

[0015] In some embodiments, it further includes: A first transmission wheel, and the second glue - applying roller is connected to the first transmission wheel; A second transmission wheel, the third glue - applying roller is connected to the second transmission wheel, and the second transmission wheel is meshed and connected to the first transmission wheel.

[0016] In some embodiments, it further includes: A glue - adding pipe, the glue - adding pipe is arranged on the machine base and communicates with the glue tank.

[0017] The technical solution of this application proposes a preparation method for an under - screen fingerprint unlocking film. The preparation method is as follows: S1. Apply optical glue on one side of the release film through a roll - coating device and perform high - temperature curing; S2. Cover another release film on the release film coated with optical glue and perform aging and fixing to obtain a pre - coating layer; S3. Apply silicone on the SRF film layer through a roll - coating device and perform high - temperature curing; S4. Cover a release film on the SRF film layer coated with silicone to obtain a base film; S5. Tear off the release film on one side of the pre - coating layer and cover a protective film layer; S6. Tear off the release film on the other side of the pre - coating layer, and cover the pre - coating layer with the protective film layer on the base film to obtain an under - screen fingerprint unlocking film. In this application, by using a roll - coating device to lay the silicone layer or the optical glue layer, it is beneficial to improve the processing efficiency, can precisely control the thickness of the silicone layer or the optical glue layer, and the laid silicone layer or optical glue layer is uniform, which is beneficial to the tight combination between layers of materials, improves the overall performance and stability of the film, and is also beneficial to improving the optical performance of the film. By forming a large - sized under - screen fingerprint unlocking film in one step and then cutting it to form the finished product of the under - screen fingerprint unlocking film, the processing efficiency can be effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings, where: Figure 1 is the technical route diagram of the preparation method for the under - screen fingerprint unlocking film in an embodiment of the present application; Figure 2 is the structural schematic diagram of the under - screen fingerprint unlocking film in an embodiment of the present application; Figure 3 is the three - dimensional structural schematic diagram of the roll - coating device in one perspective in an embodiment of the present application; Figure 4 A cross-sectional view of a roll coating device in an embodiment of the present application; Figure 5 is Figure 4 a partially enlarged view of part A in Figure 6 A three-dimensional structural schematic diagram of the roll coating device in another perspective in an embodiment of the present application; Figure 7 A three-dimensional structural schematic diagram of a coating table and a fixing table in an embodiment of the present application; Figure 8 is Figure 7 a partially enlarged view of part B in

[0019] In the figure: release film 101, silicone layer 102, SRF film layer 103, optical adhesive layer 104, protective film layer 105, machine base 1, glue coating drive 2, slider 3, third glue coating roller 4, glue coating roller drive 5, guide rail 6, gear guard 7, glue adding pipe 8, fixed end plate 9, low surface 91, high surface 92, convex surface 93, reinforcing groove 931, side plate 10, first glue coating roller 11, coating table 12, side protrusion 13, second glue coating roller 14, second coating layer 15, glue tank 16, screw 17, second positioning groove 18, fixing table 19, film layer material 20, groove surface 21, first transmission wheel 22, second transmission wheel 23, first positioning groove 24. Detailed implementation manners

[0020] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present application.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present application are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time.

[0023] In addition, the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the fact that those of ordinary skill in the art can implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0024] Referring to Figure 1 and Figure 2 as shown, this application proposes a method for preparing an in-screen fingerprint unlocking film, and the preparation method is as follows: S1. Coat an optical adhesive on one side of the release film 101 (heavy type) through a roll coating device and perform high-temperature curing; the optical adhesive is OCA optical adhesive, and high-temperature curing means curing at 130 °C for 5 minutes; S2. Cover another layer of release film 101 on the release film 101 coated with the optical adhesive and perform aging and fixing to obtain a pre-coated layer; aging and fixing means aging at 40 °C - 50 °C for 3 days to finally obtain a pre-coated layer; S3. Coat silica gel on the SRF film layer 103 through a roll coating device and perform high-temperature curing; the high-temperature curing here means curing at 120 °C for 5 minutes; S4. Cover a layer of release film 101 on the SRF film layer 103 coated with silica gel to obtain a base film; S5. Tear off the release film 101 on one side of the pre-coated layer and cover a protective film layer 105; the protective film layer 105 is composed of the outermost protective layer, the hardening layer adjacent to the protective layer, and the innermost TAC film layer; S6. Tear off the release film 101 on the other side of the pre-coated layer, and cover the pre-coated layer with the protective film layer 105 on the base film to obtain an in-screen fingerprint unlocking film. After the in-screen fingerprint unlocking film is formed, it needs to be cut according to the shape of the screen to finally form the finished product of the in-screen fingerprint unlocking film.

[0025] Specifically, in this application, laying the silica gel layer 102 or the optical adhesive layer 104 through a roll coating device is beneficial to improving the processing efficiency, can precisely control the thickness of the silica gel layer 102 or the optical adhesive layer 104, and the laid silica gel layer 102 or optical adhesive layer 104 is uniform, which is beneficial to the tight combination between the layers of materials, improves the overall performance and stability of the film, and is also beneficial to improving the optical performance of the film. By forming a large piece of the in-screen fingerprint unlocking film at one time and then cutting it to form the finished product of the in-screen fingerprint unlocking film, the processing efficiency can be effectively improved.

[0026] Referring to Figure 3 , Figure 4 and Figure 5As shown, in some embodiments, the roll coating device includes: a machine base 1; the machine base 1 is the structural foundation of the roll coating device, and other structures on the roll coating device are directly or indirectly connected to the machine base 1. A first glue coating roller 11, the first glue coating roller 11 is rotatably arranged on the machine base 1; a first coating layer, the first coating layer is arranged on the outer peripheral surface of the first glue coating roller 11; the first coating layer is infiltrated with silicone or optical glue. When the first coating layer contacts the film layer material 20, the silicone or optical glue infiltrated in the first coating layer is extruded onto the film layer material 20, so as to evenly lay silicone or optical glue on the film layer material 20; a coating table 12; the coating table 12 is the structural foundation of the film layer material 20, and the coating table 12 is also provided with a linear drive for driving the coating table 12 to reciprocate linearly to complete the laying of silicone or optical glue on the film layer material 20, a fixing table 19, the fixing table 19 is arranged on the coating table 12, and the fixing table 19 is provided with a receiving cavity for receiving the film layer material 20; the fixing table 19 is arranged at the upper end of the coating table 12, and the fixing table 19 can better fix the film layer material 20 to prevent the film layer material 20 from shifting during the glue coating process, which affects the uniformity of the glue layer; two fixing end plates 9, the two fixing end plates 9 are respectively arranged at both ends of the fixing table 19. The fixing end plates 9 are used to fix both ends of the film layer material 20 to the fixing table 19, so that the film layer material 20 is integrally fixed to the fixing table 19 to prevent the film layer material 20 from shifting or wrinkling during the glue coating process, which affects the laying of silicone or optical glue.

[0027] Specifically, the coating table 12 moves forward at a constant speed in a straight line under the action of the linear drive. During the movement of the coating table 12, the first glue coating roller 11 rotates at a constant speed, so as to smear the silicone or optical glue infiltrated in the first coating layer onto the film layer material 20, realizing the uniform laying of silicone or optical glue, which is beneficial to improving the laying efficiency of silicone or optical glue, and improving the uniformity of the silicone layer 102 or the optical glue layer 104, which is beneficial to the tight combination between layers of materials, improving the overall performance and stability of the film, and is also beneficial to improving the optical performance of the film.

[0028] Among them, the method of fixing the film layer material 20 to the fixing table 19 by two fixing end plates 9 is as follows: lay the film layer material 20 in the accommodating cavity on the fixing table 19, and ensure that the film layer material 20 is laid evenly without wrinkles. Place the two fixing end plates 9 at both ends of the fixing table 19 respectively, and simultaneously press the two fixing end plates 9 onto the fixing table 19 through a pressing device, so as to fix the film layer material 20 to the fixing table 19. The pressing device continuously provides stable pressure, and the fixing end plate 9 is installed on the fixing table 19 through screws 17 to complete the fixing of the film layer material 20. By setting two fixing end plates 9, the film layer material 20 can be effectively fixed to the fixing table 19 as a whole, avoiding the deviation or wrinkle of the film layer material 20 during the gluing process, which affects the laying of silicone or optical glue. And it makes the two ends of the film layer material 20 not lay the glue layer, which is beneficial to the subsequent removal of the release film 101. Of course, in the final slitting process, the two ends of the film need to be cut off. This part is not the finished film, and the proportion of this part in the overall area of the film is very small, about 1% - 3%, which will not have a great impact on the production cost of the film.

[0029] Among them, the axial length of the first coating layer is equal to the width of the film layer material 20, which is beneficial to the uniform laying of silicone or optical glue.

[0030] Refer to Figure 3 、 Figure 4 and Figure 5 As shown in

[0031] Refer to Figure 3 、 Figure 4 and Figure 5As shown, in some embodiments, the fixed end plate 9 further includes: a plurality of reinforcing grooves 931, and the convex surface 93 and the low surface 91 are both provided with the reinforcing grooves 931 at intervals. During the process of static pressure fixing the end plate 9, the film material 20 between the convex surface 93 and the low surface 91 and the fixing table 19 will deform, and after the film material 20 deforms, it is squeezed into the reinforcing grooves 931 on the convex surface 93 and the low surface 91, enhancing the reliability of the connection between the film material 20 and the fixed end plate 9.

[0032] In this embodiment, the cross-sectional shape of the reinforcing groove 931 is any one of an arc shape, a rectangular shape, a trapezoidal shape, or a triangular shape. Preferably, the cross-sectional shape of the reinforcing groove 931 is an arc shape to prevent the film material 20 from breaking after being squeezed into the reinforcing groove 931.

[0033] Refer to Figure 3 、 Figure 7 and Figure 8 As shown, in some embodiments, it further includes: two side plates 10, which are respectively arranged on both sides of the fixing table 19; the two side plates 10 are used to limit the position of the film material 20, and the distance between the two side plates 10 is equal to the width of the film material 20; a first positioning groove 24 is provided on the side plate 10 for positioning the fixed end plate 9. When placing the fixed end plate 9, the fixed end plate 9 is placed into the first positioning groove 24, which is beneficial to improving the accuracy of the position of the fixed end plate 9 and enhancing the reliability of the connection between the fixed end plate 9 and the film material 20.

[0034] Refer to Figure 3 、 Figure 7 and Figure 8 As shown, in some embodiments, it further includes: a side protrusion 13, which is provided on one side of the two side plates 10 opposite to each other. The side protrusion 13 is made of ceramic material, and the ceramic material is relatively smooth, which can effectively prevent silicone or optical glue from hanging on the side wall. There is an included angle between the side protrusion 13 and the side plate 10, making it easier for the silicone or optical glue to slide off and preventing the silicone or optical glue from hanging on the wall.

[0035] Refer to Figure 3 、 Figure 4 and Figure 5 As shown, in some embodiments, it further includes: a second positioning groove 18, and the coating table 12 is provided with a second positioning groove 18 for positioning the fixing table 19. The second positioning groove 18 is a rectangular groove, and the fixing table 19 is placed into the second positioning groove 18. The setting of the second positioning groove 18 ensures the position of the fixing table 19 relative to the coating table 12, thereby ensuring the relative position of the film material 20 relative to the first coating layer and ensuring that the silicone or optical glue can be evenly laid on the film material 20.

[0036] Refer to Figure 3 、 Figure 4 and Figure 6As shown, in some embodiments, it further includes: a glue tank 16 disposed on the machine base 1; the glue tank 16 stores silicone glue or optical glue; a second glue application roller 14 rotatably disposed on the machine base 1; a second coating layer 15 disposed on the outer peripheral surface of the second glue application roller 14, and a part of the circumferential profile generatrix of the second coating layer 15 is located in the glue tank 16; a glue application drive 2 disposed on the machine base 1, the glue application drive 2 is connected to the second glue application roller 14; the glue application drive 2 drives the second glue application roller 14 to rotate, thereby driving the second coating layer 15 to continuously rotate into the glue tank 16 to absorb silicone glue or optical glue, a third glue application roller 4 rotatably disposed on the machine base 1, the third glue application roller 4 contacts the second coating layer 15 and the first coating layer, and the outer peripheral surface of the third glue application roller 4 is provided with reticulate grooves. The third glue application roller 4 rotates to extrude the silicone glue or optical glue in the second coating layer 15 into the reticulate grooves, and transfer the silicone glue or optical glue in the reticulate grooves to the first coating layer. Through the above steps, the transfer of silicone glue or optical glue can be effectively realized, and the amount of silicone glue or optical glue infiltrated in the first coating layer can be stabilized.

[0037] In this embodiment, a glue application roller drive 5 is further disposed on the machine base 1, the glue application roller drive 5 is connected to the first glue application roller 11, and by controlling the position of the first glue application roller 11, the distance between the first glue application roller 11 and the third glue application roller 4 can be controlled. When the distance decreases, the first coating layer can absorb more silicone glue or optical glue from the reticulate grooves. On the contrary, the amount of silicone glue or optical glue that the first coating layer can absorb from the reticulate grooves will decrease. Of course, the coating table 12 will move along with the first glue application roller 11. A guide rail 6 is further disposed on the machine base 1, and the output end of the glue application roller drive 5 is further connected with a slider 3, the slider 3 is adapted to the guide rail 6, and the first glue application roller 11 is rotatably mounted on the slider 3. Through the cooperation of the slider 3 and the guide rail 6, the stability of the movement of the first glue application roller 11 is improved, and the content of silicone glue or optical glue in the first coating layer is adjusted by the glue application roller drive 5, so as to change the thickness of the silicone layer 102 or the optical glue layer 104 to adapt to different engineering requirements. The glue application roller drive 5 is preferably a hydraulic cylinder, and the glue application drive 2 is preferably a motor.

[0038] Refer to Figure 3 、 Figure 4 and Figure 6 As shown, in some embodiments, it further includes: a first transmission wheel 22, the second glue application roller 14 is connected to the first transmission wheel 22; a second transmission wheel 23, the third glue application roller 4 is connected to the second transmission wheel 23, and the second transmission wheel 23 is meshed and connected to the second transmission wheel 23. The first transmission wheel 22 and the second transmission wheel 23 are meshed and driven, so as to transfer the power from the second glue application roller 14 to the third glue application roller 4. A gear guard 7 is disposed on the machine base 1 to protect the first transmission wheel 22 and the second transmission wheel 23.

[0039] Refer to Figure 3 、Figure 4 and Figure 6 As shown in Figure 6 , in some embodiments, it further includes: a glue adding pipe 8, which is arranged on the machine base 1 and communicates with the glue tank 16. The glue adding pipe 8 is used for adding silicone glue or optical glue.

[0040] The above are only partial or preferred embodiments of the present application. Neither the text nor the drawings can limit the scope of protection of the present application. Any equivalent structural transformation made by using the content of the specification and drawings of the present application under the overall concept of the present application, or any direct / indirect application in other related technical fields, is included in the scope of protection of the present application.

Claims

1. A method for preparing an in-screen fingerprint unlocking film, characterized in that The preparation method is as follows: S1. Coat an optical adhesive on one side of the release film (101) through a roll coating device and cure it at high temperature; S2. Cover another release film (101) on the release film (101) coated with the optical adhesive and cure and fix it to obtain a pre-coated layer; S3. Coat silica gel on the SRF film layer (103) through a roll coating device and cure it at high temperature; S4. Cover a release film (101) on the SRF film layer (103) coated with silica gel to obtain a base film; S5. Tear off the release film (101) on one side of the pre-coated layer and cover a protective film layer (105); S6. Tear off the release film (101) on the other side of the pre-coated layer, and cover the pre-coated layer with the protective film layer (105) on the base film to obtain an in-screen fingerprint unlocking film.

2. The method for preparing an in-screen fingerprint unlocking film according to claim 1, wherein The roll coating device includes: A machine base (1); A first glue coating roller (11), the first glue coating roller (11) is rotatably arranged on the machine base (1); A first coating layer, the first coating layer is arranged on the outer peripheral surface of the first glue coating roller (11); A coating table (12); A fixing table (19), the fixing table (19) is arranged on the coating table (12), and a receiving cavity for receiving the film layer (103) material is arranged on the fixing table (19); Two fixing end plates (9), the two fixing end plates (9) are respectively arranged at both ends of the fixing table (19).

3. The preparation method of the under-screen fingerprint unlocking film according to claim 2, wherein, The fixing end plate (9) further includes: A high-level surface (92), the high-level surface (92) is arranged at the bottom end of the fixing end plate (9); A convex surface (93), the convex surface (93) is connected to the high-level surface (92) on the side away from the end of the film layer (103), and the fixing table (19) is provided with a groove surface (21) adapted to the convex surface (93); A low-level surface (91), the other side of the convex surface (93) is connected to the low-level surface (91).

4. The method for preparing an in-screen fingerprint unlocking film according to any one of claims 3, characterized in that The fixing end plate (9) further includes: A plurality of reinforcing grooves (931), the reinforcing grooves (931) are arranged at intervals on both the convex surface (93) and the low-level surface (91).

5. The preparation method of the under-screen fingerprint unlocking film according to claim 2, wherein, It further includes: Two side plates (10), the two side plates (10) are respectively arranged on both sides of the fixing table (19); A first positioning groove (24), the first positioning groove (24) for positioning the fixing end plate (9) is arranged on the side plate (10).

6. The method for preparing an in-screen fingerprint unlocking film according to claim 5, wherein It further includes: A side protrusion (13), the side protrusion (13) is arranged on the opposite sides of the two side plates (10).

7. The method for preparing an in-screen fingerprint unlocking film according to claim 2, wherein, It further includes: A second positioning groove (18), the second positioning groove (18) for positioning the fixing table (19) is arranged on the coating table (12).

8. The method for preparing an in-screen fingerprint unlocking film according to claim 2, wherein It further includes: A glue tank (16), the glue tank (16) is arranged on the machine base (1); A second glue coating roller (14), the second glue coating roller (14) is rotatably arranged on the machine base (1); A second coating layer (15), the second coating layer (15) is arranged on the outer peripheral surface of the second glue coating roller (14), and a part of the circumferential profile generatrix of the second coating layer (15) is located in the glue tank (16); Glue application drive (2), the glue application drive (2) is arranged on the machine base (1), and the glue application drive (2) is connected to the second glue application roller (14); The third glue application roller (4), the third glue application roller (4) is rotatably arranged on the machine base (1), the third glue application roller (4) contacts the second coating layer (15) and the first coating layer, and the outer peripheral surface of the third glue application roller (4) is provided with reticulate grooves.

9. The method for preparing an in-screen fingerprint unlocking film according to claim 8, characterized in that, It further includes: The first transmission wheel (22), the second glue application roller (14) is connected to the first transmission wheel (22); The second transmission wheel (23), the third glue application roller (4) is connected to the second transmission wheel (23), and the second transmission wheel (23) is meshed and connected to the second transmission wheel (23).

10. The method for preparing an in-screen fingerprint unlocking film according to claim 8, characterized in that, It further includes: The glue adding pipe (8), the glue adding pipe (8) is arranged on the machine base (1) and communicates with the glue tank (16).

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