Film covering device and method for curved-surface liquid crystal display screen

Abstract

The invention provides a film covering device and method for a curved-surface liquid crystal display screen. The film covering device comprises a heating roller and a pressing roller which are arranged on a movable roller body support; one side of the film body is wound and stored on the discharging roller, the other side of the film body is sequentially arranged on the heating roller and the pressing roller, and a release film layer of the film body is wound and stored on the receiving roller; the maximum stroke length of the film body between the heating roller and the pressing roller is set to be L < = (K1-K2) / Q; wherein L is the maximum stroke length of the film body between the heating roller and the pressing roller, Q is the average temperature reduction value of the heated film body in unit stroke length, K1 is the temperature of the film body heated by the heating roller, and K2 is the lowest temperature of the film body for maintaining thermal softening; the heating roller continuously heats the part, corresponding to the large curvature of the curved screen to be covered, of the thermal deformation film layer. The problem that after a curved display screen with the large curvature is used for a long time, a film body part rebounds, is degummed and tilts is solved, and the curved surface attaching effect of the rolling film covering technology is improved.

Description

Technical Field

[0001] The present application relates to the technical field of curved display screens, and in particular to a coating device and method for a curved liquid crystal display screen. Background Art

[0002] Flexible OLED (Organic Light-Emitting Diode) technology is a technology that places light-emitting lamp beads on a flexible substrate to emit light. Based on the deformable and bending characteristics of flexible OLED, flexible OLED is often used as a light-emitting panel for curved display screens of various sizes and shapes, small sizes such as curved smartphones and smart watches, and folding screen phones (curved at the crease), etc., large sizes such as curved advertising displays, long-sized ultra-wide screens, and car-mounted special-shaped displays, etc.

[0003] For curved screens or devices with curved screens that are produced before delivery, some manufacturers will pre-cover the curved screens with a factory film. This can not only prevent scratches on the surface of these curved screens in the subsequent factory delivery process, but also allow consumers to use them directly after purchase without having to purchase special protective films and cover them themselves. Especially for curved screen smartphones that have just been launched on the market, it takes a certain period of time for third-party protective film manufacturers to open molds and produce them.

[0004] The existing curved screen laminating process mainly includes finished film laminating and roll laminating. The patent document with publication number CN106597711A is cited here, which discloses a curved screen laminating device and method, and specifically discloses that the curved screen laminating device includes a fan-shaped rotating mechanism and a curved screen carrier, the curved screen carrier is arc-shaped, the fan-shaped rotating mechanism includes a rotating shaft and a plurality of telescopic rods, the rotating shaft is arranged on the inner side of the curved screen carrier, one end of the plurality of telescopic rods are fixedly arranged at different positions on the same circular ring of the rotating shaft, and the other end of the plurality of telescopic rods are arranged at different positions on the same circular ring of the curved screen carrier, and the plurality of telescopic rods can rotate in the same plane with the rotation of the rotating shaft, thereby driving the curved screen carrier to rotate around the rotating shaft, and when the telescopic rods are extended and retracted, the curvature radius of the curved screen carrier increases or decreases accordingly. It can be seen that CN106597711A adjusts the extension of the telescopic rod to adapt to the curvature radius of the curved part of the curved screen to be coated, and performs coating through the rotation of the fan-shaped rotating mechanism and the lifting mechanism and the laminating roller, so that the film body and the curved screen are pressed more fully during the rolling process. However, for display screens with larger curvatures, CN106597711A cannot solve the problem of partial rebound, debonding and warping after long-term use.

[0005] It should be noted that the information in the above background technology section includes selective and directional example descriptions based on the present application. Therefore, the above is only used to enhance the understanding of the background technology of the present application. The above may include technical information that is not known or easily inferred by ordinary technicians in the field. Summary of the invention

[0006] In view of the above problems, the present application is proposed to provide a coating device and method for a curved liquid crystal display screen that overcomes the above problems or at least partially solves the above problems.

[0007] The present application discloses a film coating device for a curved liquid crystal display screen, which is used to coat a film body on a curved screen to be coated, wherein the film body includes a release film layer and a heat-deformed film layer softened by heat; the device includes: a control component, a movable roller support, a material discharge roller, a heating roller, a pressure roller, a material collection roller, and a curved screen support platform for mounting the curved screen to be coated; the heating roller includes at least one; The heating roller and the pressing roller are arranged on the movable roller support; one side of the film body is rolled up and stored on the unwinding roller, and the other side of the film body is arranged on the heating roller and the pressing roller in sequence, and the release film layer of the film body is rolled up and stored on the receiving roller; the maximum stroke length of the film body between the heating roller and the pressing roller is set as: L≤(K1-K2) / Q Wherein, L is the maximum stroke length of the film between the heating roller and the pressure roller, Q is the average temperature drop of the heated film per unit stroke length, K1 is the temperature to which the film is heated by the heating roller, and K2 is the minimum temperature at which the film maintains thermal softening; When laminating, the heating roller continuously heats the portion of the heat-deformed film layer corresponding to the larger curvature of the curved screen to be covered; the control component drives the film body to unwind, and drives the movable roller body support to make the pressure roller and the curved screen to be covered abut and move relative to each other, and makes the heat-deformed film layer on the outer side of the pressure roller adhere to the curved screen to be covered.

[0008] Furthermore, the device also includes a first guide rail arranged on the top beam; the movable roller support includes: a first translation mechanism, a lifting mechanism, a main suspension and at least two cantilevers; The first translation mechanism is movably arranged on the first guide rail along the length direction of the first guide rail; one end of the lifting mechanism is connected to the first translation mechanism, and the other end of the lifting mechanism is connected to the main suspension; The main suspension is connected to the cantilever, and the cantilever is rotatably adjustable relative to the main suspension; The heating roller and the pressing roller are respectively arranged on different cantilevers; the cantilever where the pressing roller is located is arranged close to the curved screen supporting platform.

[0009] Further, the heating rollers include at least two; the cantilevers include at least three; the first heating roller is arranged on the first cantilever; the second heating roller is arranged on the second cantilever; the pressure roller is arranged on the third cantilever; When laminating, the first heating roller and the second heating roller are respectively used to simultaneously and continuously heat the two parts of the thermally deformable film layer corresponding to the same curved screen to be coated with a larger curvature.

[0010] Furthermore, the first cantilever is provided with a guide groove for adjusting the position of the first heating roller; and the second cantilever is provided with a guide groove for adjusting the position of the second heating roller.

[0011] Furthermore, the heating rollers include at least three; the third heating roller is arranged on the main suspension.

[0012] Furthermore, the curved screen support platform includes a second translation mechanism; the device also includes a second guide rail; the second translation mechanism is movably disposed on the second guide rail along the length direction of the second guide rail.

[0013] Furthermore, the heating rollers include at least two; and further include: a heat-conducting belt; the heat-conducting belt surrounds and covers the at least two heating rollers.

[0014] Furthermore, the film body further comprises a heat shrinkable film layer that shrinks when heated; the heat shrinkable film layer is arranged on a side of the heat deformable film layer away from the release film layer; When laminating, the heating roller is used to continuously heat the portion of the heat shrinkable film layer corresponding to the portion with a larger curvature of the curved screen to be coated.

[0015] The present application also discloses a coating method for a curved liquid crystal display screen, the method being implemented by a coating device for a curved liquid crystal display screen as described in any embodiment of the present application; The method comprises: S1, installing the curved screen to be covered on the curved screen support platform; S2, positioning the surface of the curved screen to be covered and setting the stroke of the pressing roller; S3, positioning the portion of the curved screen to be covered with a larger curvature, and determining the installation position of the heating roller; S4, the control component drives the film to unwind and feed the film once until the film is at a position corresponding to the heating roller; S5, continuously heating the portion of the thermally deformable film layer corresponding to the larger curvature of the curved screen to be covered by the heating roller; S6, the control component drives the film to unwind and perform secondary film feeding until the heated part of the film is at the position corresponding to the pressure roller; S7, the control component drives the movable roller support and drives the film to unwind according to the stroke of the pressing roller, so that the pressing roller and the curved screen to be covered abut against and move relative to each other, and the thermally deformable film layer on the outer side of the pressing roller adheres to the curved screen to be covered; S8, the control component drives the movable roller support to reset; S9, cooling the thermally deformable film layer, and removing the display screen to be coated after the coating is completed.

[0016] Further, the heating rollers include at least two; The step of positioning the portion of the curved screen to be covered with a larger curvature to determine the installation position of the heating roller comprises: At least two parts of the curved screen to be covered with a larger curvature are positioned, and the installation positions of the at least two heating rollers are determined respectively.

[0017] This application has the following advantages: In the embodiments of the present application, compared with the existing roller-pressed lamination process which cannot solve the problem of partial rebound, degumming and warping of the film body after long-term use of curved display screens with larger curvature, the present application provides a solution in which a heating roller and a pressure roller are arranged on a movable roller body bracket, the heating roller continuously heats the heat-deformed film layer corresponding to the portion with larger curvature of the curved screen to be coated, the control component drives the film body to unwind, and drives the movable roller body bracket to perform lamination, specifically: the heating roller and the pressure roller are arranged on the movable roller body bracket; one side of the film body is rolled up and stored on the unwinding roller, the other side of the film body is arranged on the heating roller and the pressure roller in sequence, the release film layer of the film body is rolled up and stored on the receiving roller; the heating roller and the pressure roller are arranged on the movable roller body bracket; The maximum stroke length of the film between the pressure rollers is set to: L≤(K1-K2) / Q; wherein L is the maximum stroke length of the film between the heating roller and the pressure roller, Q is the average temperature drop of the heated film per unit stroke length, K1 is the temperature to which the film is heated by the heating roller, and K2 is the lowest temperature at which the film maintains thermal softening; when laminating, the heating roller continuously heats the portion of the thermally deformed film layer corresponding to the larger curvature of the curved screen to be covered; the control component drives the film to unwind, and drives the movable roller support to make the pressure roller and the curved screen to be covered abut and move relative to each other, and makes the thermally deformed film layer on the outside of the pressure roller adhere to the curved screen to be covered. This application solves the problem of partial rebound, debonding and warping of the film after long-term use of curved display screens with larger curvatures, and improves the curved surface bonding effect of the roller lamination process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the description of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 This is a first overall structural schematic diagram of a coating device for a curved liquid crystal display screen provided by an embodiment of the present application; Figure 2 It is a second overall structural schematic diagram of a coating device for a curved liquid crystal display screen provided by an embodiment of the present application; Figure 3 This is a schematic diagram of the overall structure of the movable roller support in one embodiment of the present application; Figure 4 is a schematic structural diagram of a convex curved screen and a concave curved screen in one embodiment of the present application; Figure 5 This is a schematic diagram of the roller arrangement structure when the curved screen to be covered is a mobile phone screen with curved sides in one embodiment of the present application; Figure 6 This is a schematic diagram of the roller arrangement structure when the curved screen to be covered is a folding screen mobile phone screen with arc-shaped sides and a concave fold in the middle in one embodiment of the present application; Figure 7 This is a schematic diagram of the roller arrangement structure when the curved screen to be covered is a curved surface with a large overall curvature in one embodiment of the present application; Figure 8 It is a schematic diagram of the roller arrangement structure when the curved screen to be covered is a screen with a relatively long horizontal dimension, or the pressing roller and the heating roller are relatively close in one embodiment of the present application; Fig. 9 It is a schematic diagram of the roller arrangement structure when the curved screen to be covered is a screen with a shorter horizontal dimension in one embodiment of the present application; Fig.10 is a first structural schematic diagram of a cantilever in one embodiment of the present application; Fig.11 It is a second structural schematic diagram of the cantilever in one embodiment of the present application.

[0020] The reference numerals are as follows: 1. Membrane body; 2. Curved screen to be covered; 3. Movable roller support; 30. Main suspension; 31. Cantilever; 311. First cantilever; 312. Second cantilever; 313. Third cantilever; 314. Guide groove; 33. First translation mechanism; 34. Lifting mechanism; 41. Heating roller; 411. First heating roller; 412. Second heating roller; 413. Third heating roller; 414. Belt guide; 42. Pressing roller; 43. Unwinding roller; 44. Rewinding roller; 51. Curved screen support platform; 52. First guide rail; 53. Second guide rail. DETAILED DESCRIPTION

[0021] In order to make the objects, features and advantages of the present application more obvious and understandable, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0022] The inventors found through analysis of the prior art that the existing roller-pressing lamination process cannot solve the problem of partial rebound, degumming and warping of the film body after long-term use of curved display screens with large curvature. The essential reason is that the existing roller-pressing lamination process for curved screens only performs physical rolling more fully at the contact point between the laminating roller and the curved surface, but does not substantially change the structure or performance of the film body itself. As a result, after long-term use, the adhesive performance of the film body adhesive gradually weakens, while the pure physical rolling causes the elasticity and internal stress of the film body itself to still exist. After the change in the adhesive strength of the adhesive reaches a certain threshold, the film body will rebound, degumming and warping.

[0023] As a relative reference, the finished film laminating process first produces an independent finished film through customized mold opening, injection molding, hot bending or heat setting molding, and cutting, and then the curved screen is laminated manually or by machine. This method can better fit the finished film to the curved screen and is not easy to warp. It can be seen that the finished film laminating process actually pre-shapes the shape of the output film body, so that it usually does not generate additional internal stress during the laminating stage. However, the overall process of the finished film laminating process is relatively complicated and the cost is relatively high, while the roller laminating process can directly use the film produced in rolls for laminating, without the need for cutting and collecting materials, the process is simple, and the cost is also low. Since neither process can meet the production efficiency and laminating effect at the same time, finished film laminating and roller laminating have become difficult process choices.

[0024] Based on the above systematic analysis of the prior art by the inventors, the core technical concept of the present application is to improve the roller-type lamination process as follows: before roller-type lamination, the film body is pre-heated and softened on a heating roller, and before the film body is heat-formed again, the film body is promptly pressed onto the curved screen, and the film body is finally cooled and formed directly on the curved screen. The formed film body has a new stress state. While retaining the advantages of low cost and high efficiency of the roller-type lamination process, the curved surface bonding effect of the film body is also better.

[0025] Reference Figure 1-3 , shows a film laminating device for a curved liquid crystal display screen provided by an embodiment of the present application, which is used to cover a film body 1 on a curved screen 2 to be covered, wherein the film body 1 includes a release film layer and a heat-softened thermal deformation film layer; the device includes: a control component, a movable roller support 3, a discharge roller 43, a heating roller 41, a pressure roller 42, a receiving roller 44, and a curved screen support platform 51 for mounting the curved screen 2 to be covered; the heating roller 41 includes at least one; The heating roller 41 and the pressing roller 42 are arranged on the movable roller support 3; one side of the film body 1 is rolled up and stored on the unwinding roller 43, and the other side of the film body 1 is arranged on the heating roller 41 and the pressing roller 42 in sequence, and the release film layer of the film body 1 is rolled up and stored on the receiving roller 44; the maximum stroke length of the film body 1 between the heating roller 41 and the pressing roller 42 is set to: L≤(K1-K2) / Q Wherein, L is the maximum stroke length of the film 1 between the heating roller 41 and the pressing roller 42, Q is the average temperature drop value of the heated film 1 per unit stroke length, K1 is the temperature to which the film 1 is heated by the heating roller 41, and K2 is the minimum temperature at which the film 1 maintains thermal softening; When laminating, the heating roller 41 continuously heats the portion of the heat-deformed film layer corresponding to the larger curvature of the curved screen 2 to be covered; the control component drives the film body 1 to unwind, and drives the movable roller body support 3 to make the pressure roller 42 and the curved screen 2 to be covered abut and move relative to each other, and makes the heat-deformed film layer on the outside of the pressure roller 42 adhere to the curved screen 2 to be covered.

[0026] In the embodiments of the present application, compared with the existing roller lamination process which cannot solve the problem that the film body 1 partially rebounds, debonds, and warps after long-term use of a curved display screen with a large curvature, the present application provides a solution in which a heating roller 41 and a pressure roller 42 are arranged on a movable roller support 3, the heating roller 41 continuously heats the thermally deformable film layer corresponding to the portion with a large curvature of the curved screen 2 to be coated, and a control component drives the film body 1 to unwind and drives the movable roller support 3 to perform lamination, specifically: the heating roller 41 and the pressure roller 42 are arranged on the movable roller support 3; one side of the film body 1 is rolled up and stored on the unwinding roller 43, and the other side of the film body 1 is arranged on the heating roller 41 and the pressure roller 42 in sequence, and the release film layer of the film body 1 is rolled up and stored on the receiving roller 44; the heating roller 4 The maximum stroke length of the film 1 between the heating roller 41 and the pressing roller 42 is set to: L≤(K1-K2) / Q; wherein L is the maximum stroke length of the film 1 between the heating roller 41 and the pressing roller 42, Q is the average temperature drop of the heated film 1 per unit stroke length, K1 is the temperature to which the film 1 is heated by the heating roller 41, and K2 is the lowest temperature at which the film 1 maintains thermal softening; when laminating, the heating roller 41 continuously heats the portion of the thermally deformed film layer corresponding to the portion of the curved screen 2 to be covered with a larger curvature; the control component drives the film 1 to unwind, and drives the movable roller support 3 to make the pressing roller 42 and the curved screen 2 to be covered abut and move relative to each other, and makes the thermally deformed film layer on the outside of the pressing roller 42 adhere to the curved screen 2 to be covered. The present application solves the problem of partial rebound, debonding and warping of the film after long-term use of curved display screens with larger curvatures, and improves the curved surface bonding effect of the roller lamination process.

[0027] Next, a coating device for a curved liquid crystal display screen in this exemplary embodiment will be further described.

[0028] It should be noted that the heat-deformable film layer may include a polyurethane-based film layer, the thickness of the heat-deformable film layer may be 50μm-150μm, and the thickness of the release film layer may be 25μm-75μm; the heat-deformable film layer may be pre-processed with cutting marks so that it can be released when attached to the curved screen. The heating roller 41 may be heated from one side of the heat-deformable film layer or from one side of the release film layer, depending on the actual arrangement conditions of the roller body during lamination. The thermal softening process requires the film body 1 to be heated continuously for a period of time (generally 4-8s, depending on the temperature of the heating roller 41 and the substrate of the film body 1).

[0029] Since the film 1 is relatively thin, in order to prevent the film 1 from excessively losing heat when it is transferred from the heating roller 41 to the pressing roller 42, resulting in poor thermal softening effect, it is necessary to limit the maximum stroke length of the film 1 between the heating roller 41 and the pressing roller 42, so that the actual temperature of the film 1 when it is transferred to the pressing roller 42 is not lower than the minimum temperature at which the film 1 maintains thermal softening, that is, the actual temperature drop of the film 1 is not greater than the maximum temperature drop allowed at the current heating temperature, so: T1=L·Q≤K1-K2=T2 To sort out, there are: L≤(K1-K2) / Q Wherein, T1 is the actual temperature drop of the film 1, T2 is the maximum temperature drop allowed under the current heating temperature, L is the maximum stroke length of the film 1 between the heating roller 41 and the pressing roller 42, Q is the average temperature drop value of the heated film 1 per unit stroke length, K1 is the temperature to which the film 1 is heated by the heating roller 41, and K2 is the minimum temperature at which the film 1 maintains thermal softening; Since the heat loss of the membrane body 1 is usually the greatest when it has traveled the maximum stroke, it is only necessary to measure the temperature drop of the longest stroke of the heated part of the membrane body 1; The average temperature reduction value Q of the heated film 1 per unit stroke length is a variable related to the ambient temperature, the material properties of the film 1 and the unwinding speed of the film 1. When the heating roller 41 is actually arranged, an initial film 1 stroke length L0 can be predetermined, and then the initial temperature drop T0 of the heated part of the film 1 when it is transferred from the heating roller 41 to the pressure roller 42 can be measured. The average temperature reduction value Q0 of the heated film 1 per unit stroke length in the current state can be roughly estimated, as follows: Q0≈T0 / L0 test: L0≤(K1-K2) / Q0 Then readjust the maximum stroke length L of the film 1 between the heating roller 41 and the pressing roller 42, where L is not greater than L0, re-measure the actual temperature drop T1 of the heated part of the film 1, and calculate the average temperature drop value Q of the heated film 1 per unit stroke length in the current state, and then: Q=T1 / L test: L≤(K1-K2) / Q If the conditions are met, the maximum stroke length L of the film body 1 between the heating roller 41 and the pressing roller 42 can be determined, and the installation position of the heating roller 41 can be determined accordingly; if the conditions are not met, the maximum stroke length of the film body 1 is adjusted; When measuring the actual temperature drop T1 of the heated part of the membrane body 1, if the temperature of the heated part of the membrane body 1 when it is transmitted to the pressure roller 42 is not lower than the minimum temperature K2 at which the membrane body 1 maintains thermal softening, Q may not be calculated and L may be determined directly. It should be understood that the role of Q is to describe the objective correspondence between the maximum stroke length L and the maximum temperature drop T2 allowed at the current heating temperature, and the calculation of Q should be understood as an a posteriori means.

[0030] When there are multiple heating rollers 41, the temperature of each heating roller 41 can also be adaptively adjusted to keep the temperature of the film body 1 at the pressure roller 42 as consistent as possible during lamination. The size of each roller can be selected according to the actual shape and size of the curved screen, and the radius of the pressure roller 42 should not be greater than the minimum curvature radius of the curved screen.

[0031] The heating roller 41 and the pressing roller 42 are both arranged on the movable roller body bracket 3, so that the relative position between the heating roller 41 and the pressing roller 42 remains unchanged, and the tension of the film body 1 at the pressing roller 42 is constant, ensuring that during the lamination process, the tension of the film body 1 at the pressing roller 42 will not change due to the change in the relative position of the pressing roller 42 and the heating roller 41, thereby preventing the film body 1 from accidentally releasing and increasing the defective rate. There is no need to add a tension roller between the heating roller 41 and the pressing roller 42 to avoid affecting the temperature of the film body 1.

[0032] In the scenario of continuous lamination, since the film body 1 between the pressing roller 42 and the heating roller 41 closest to it does not belong to the part required for this lamination, in order to avoid waste, as an example, the interval between the pressing roller 42 and the heating roller 41 can be optimized so that the interval can accommodate a film body 1 of the size of a curved screen, and there is just one section of available film body between each section of the used film body 1, and the spacing and size of each section of the available film body 1 are consistent, and can be rewound and used after winding; the distance between the pressing roller 42 and the heating roller 41 closest to it can also be minimized, such as Figure 8 shown.

[0033] If some types of membranes 1 have the property of shrinking when cooled, such as Figure 4 As shown in A in the middle, in the scenario of covering a convex curved surface, the film body 1 can produce elasticity with a tendency to shrink, and further fit the convex curved screen; Figure 4 As shown in B, in the scenario of fitting to a concave curved surface, the film body 1 may be partially softened during the heating stage to retain some elasticity of the film body 1, and the elasticity may be used to further fit the film body 1 to the concave curved screen.

[0034] The curved screen 2 to be covered described in the present application may include but is not limited to: a mobile phone screen with curved sides on both sides, a double-sided folding screen mobile phone screen with a concave middle part, a three-sided mobile phone folding screen including both convex parts and concave parts, a large-size curved surface display (such as a curved fish screen), and a large-size vehicle-mounted special-shaped display screen.

[0035] In one embodiment of the present application, the device further comprises a first guide rail 52 arranged on the top beam; the movable roller support 3 comprises: a first translation mechanism 33, a lifting mechanism 34, a main suspension 30 and at least two cantilevers 31; The first translation mechanism 33 is movably disposed on the first guide rail 52 along the length direction of the first guide rail 52; one end of the lifting mechanism 34 is connected to the first translation mechanism 33, and the other end of the lifting mechanism 34 is connected to the main suspension 30; The main suspension 30 is connected to the cantilever 31, and the cantilever 31 is rotatable and adjustable relative to the main suspension 30; The heating roller 41 and the pressing roller 42 are respectively arranged on different cantilevers 31 ; the cantilever 31 where the pressing roller 42 is located is arranged close to the curved screen supporting platform 51 .

[0036] It should be noted that the first translation mechanism 33 and the lifting mechanism 34 can make the movable roller support 3 move as a whole along the surface of the curved screen 2 to be covered. The heating roller 41 is arranged on the rotatable and adjustable cantilever 31, so that the position of the heating roller 41 can be adjusted more conveniently during the debugging process before processing to determine the stroke of the film body 1. The length and size of the cantilever 31 can be selected according to the size of the actual curved screen 2 to be covered and the layout of the roller. The heating roller 41 can also be directly arranged on the main suspension 30.

[0037] In one embodiment of the present application, the heating rollers 41 include at least two; the cantilever 31 includes at least three; the first heating roller 411 is disposed on the first cantilever 311; the second heating roller 412 is disposed on the second cantilever 312; the pressing roller 42 is disposed on the third cantilever 313; When laminating, the first heating roller 411 and the second heating roller 412 are respectively used to simultaneously and continuously heat the two portions of the thermally deformable film layer corresponding to the same curved screen 2 to be coated with a larger curvature.

[0038] As an example, see Figure 5 The curved screen 2 to be covered is a mobile phone screen with curved sides. When the heating roller 41 is arranged, the spacing between the first heating roller 411 and the second heating roller 412 needs to be set to be consistent with the spacing between the two curved sides of the curved screen 2 to be covered, so as to ensure that the heated part of the film body 1 corresponds to the curved part of the curved screen 2 to be covered.

[0039] In one embodiment of the present application, the first cantilever 311 is provided with a guide groove 314 for adjusting the position of the first heating roller 411 ; the second cantilever 312 is provided with a guide groove 314 for adjusting the position of the second heating roller 412 .

[0040] It should be noted that, refer to Figure 10-11 The guide groove 314 of the cantilever 31 may be arranged along the length direction or along the rotation direction relative to the main suspension 30 , and the guide groove 314 may be used to accommodate a plurality of the heating rollers 41 .

[0041] In one embodiment of the present application, the heating rollers 41 include at least three; the third heating roller 413 is disposed on the main suspension 30 .

[0042] As an example, see Figure 6 The curved screen 2 to be covered is a folding screen mobile phone screen with arc-shaped sides and a concave fold in the middle, that is, it includes three curved parts. When arranging the heating roller 41, the third heating roller 413 can be directly set on the main suspension 30, and the first heating roller 411 and the second heating roller 412 are respectively set on the two cantilevers 31. The spacing between the three heating rollers 41 is adjusted to ensure that the heated part of the film body 1 corresponds to the curved part of the curved screen 2 to be covered.

[0043] Reference Figure 8 As an example, when the curved screen 2 to be covered is a screen with a longer horizontal dimension, the position of the cantilever 31 or the heating roller 41 on the guide groove 314 can be adjusted to increase the stroke length of the film 1 between the two heating rollers 41; as another example, the distance between the pressure roller 42 and the heating roller 41 can also be appropriately reduced to avoid wasting the film 1.

[0044] As an example, see Fig. 9 When the curved screen 2 to be coated is a screen with a shorter lateral dimension, the two cantilevers 31 can be arranged on the same side relative to the main suspension 30 to minimize the travel length of the film body 1 between the two heating rollers 41.

[0045] In one embodiment of the present application, the curved screen support platform 51 includes a second translation mechanism; the device also includes a second guide rail 53; the second translation mechanism is movably disposed on the second guide rail 53 along the length direction of the second guide rail 53.

[0046] It should be noted that the second translation mechanism can move back and forth along the length direction of the second guide rail 53, and the two ends of the second guide rail 53 can also be used to connect machine tools for other processes, such as a curved screen production and assembly machine tool at the front end, which can be directly coated after assembly, or a blowing device for cooling and shaping the film body 1 can be connected at the rear end, or the rear machine tool can perform secondary pressing on the film body 1 through a mold consistent with the shape of the curved display screen, or the film body 1 can be reinforced by irradiating it with a UV lamp to enhance the shaping effect.

[0047] As an example, the curved screen support platform 51 may include a plurality of vacuum suction cups for stably adsorbing the back side of the curved screen 2 to be coated to prevent displacement during coating; the curved screen support platform 51 may also include a tilting mechanism for tilting the curved screen 2 to be coated to a certain extent to ensure sufficient contact between the film body 1 at the pressure roller 42 and the curved screen 2 to be coated.

[0048] Reference Figure 7 In one embodiment of the present application, the heating roller 41 includes at least two heating rollers; and further includes: a heat conductive belt 414; the heat conductive belt 414 surrounds and covers the at least two heating rollers 41.

[0049] It should be noted that, when the curved screen 2 to be coated has a large overall curvature, the at least two heating rollers 41 may be arranged in parallel and cover the heat-conducting belt 414. Since the rotation directions of the heating rollers 41 are consistent, a certain gap needs to be maintained between the heating rollers 41. Since the heat-conducting belt 414 rotates along with the at least two heating rollers 41, the heat-conducting belt 414 is evenly and fully heated, which can ensure that the portion of the film body 1 in contact with the heat-conducting belt 414 is also evenly heated.

[0050] In one embodiment of the present application, the film body 1 further comprises a heat shrinkable film layer that shrinks when heated; the heat shrinkable film layer is arranged on a side of the heat deformable film layer away from the release film layer; When laminating, the heating roller 41 is used to continuously heat the portion of the heat shrinkable film layer corresponding to the portion of the curved screen 2 to be coated with a larger curvature.

[0051] It should be noted that the heat shrinkable film layer can cause the film body 1 to bend and deform in a fixed direction after being partially heated. The side where the heat shrinkable film layer is located can be directly in contact with the heating roller 41 to enhance the heat shrinking effect.

[0052] The above is a description of the device embodiment of the present application. For the relevant aspects of the method embodiment of the present application, please refer to the description of the corresponding part of the device embodiment.

[0053] An embodiment of the present application discloses a coating method for a curved liquid crystal display screen, and the method is implemented by a coating device for a curved liquid crystal display screen as described in any embodiment of the present application; The method comprises: S1, installing the curved screen 2 to be covered on the curved screen support platform 51; S2, positioning the surface of the curved screen 2 to be covered, and setting the stroke of the pressing roller 42; S3, positioning the portion of the curved screen 2 to be covered with a larger curvature, and determining the installation position of the heating roller 41; S4, the control component drives the film body 1 to unwind and feed the film once until the film body 1 is at a position corresponding to the heating roller 41; S5, continuously heating the portion of the thermally deformable film layer corresponding to the curved screen 2 to be covered with a larger curvature by the heating roller 41; S6, the control component drives the film body 1 to unwind and perform secondary film feeding until the heated part of the film body 1 is at the position corresponding to the pressing roller 42; S7, the control component drives the movable roller support 3 and drives the film body 1 to unwind according to the stroke of the pressing roller 42, so that the pressing roller 42 and the curved screen 2 to be covered abut against and move relative to each other, and the thermally deformable film layer on the outer side of the pressing roller 42 adheres to the curved screen 2 to be covered; S8, the control component drives the movable roller support 3 to reset; S9, cooling the thermally deformable film layer, and removing the display screen to be coated after the coating is completed.

[0054] In one embodiment of the present application, the heating roller 41 includes at least two; The specific process of "locating the portion of the curved screen 2 to be covered with a larger curvature and determining the installation position of the heating roller 41" in step S110 can be further described in combination with the following description: As described in the following steps, at least two portions of the curved screen 2 to be covered with a larger curvature are positioned, and the installation positions of the at least two heating rollers 41 are determined correspondingly.

[0055] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0056] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0057] The above is a detailed introduction to a coating device and method for a curved liquid crystal display provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea. At the same time, for technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A coating device for a curved liquid crystal display screen, used for coating a film body on a curved screen to be coated, characterized in that: The film body includes a release film layer and a heat-softened thermal deformation film layer; the device includes: a control component, a movable roller support, a material unwinding roller, a heating roller, a pressure roller, a material receiving roller, and a curved screen support platform for mounting the curved screen to be covered; the heating roller includes at least one; The heating roller and the pressing roller are arranged on the movable roller support; one side of the film body is rolled up and stored on the unwinding roller, and the other side of the film body is arranged on the heating roller and the pressing roller in sequence, and the release film layer of the film body is rolled up and stored on the receiving roller; the maximum stroke length of the film body between the heating roller and the pressing roller is set as: L≤(K1-K2) / Q Wherein, L is the maximum stroke length of the film between the heating roller and the pressure roller, Q is the average temperature drop of the heated film per unit stroke length, K1 is the temperature to which the film is heated by the heating roller, and K2 is the minimum temperature at which the film maintains thermal softening; When laminating, the heating roller continuously heats the portion of the heat-deformed film layer corresponding to the larger curvature of the curved screen to be covered; the control component drives the film body to unwind, and drives the movable roller body support to make the pressure roller and the curved screen to be covered abut and move relative to each other, and makes the heat-deformed film layer on the outer side of the pressure roller adhere to the curved screen to be covered.

2. The device according to claim 1, characterized in that The device also includes a first guide rail arranged on the top beam; the movable roller support includes: a first translation mechanism, a lifting mechanism, a main suspension and at least two cantilevers; The first translation mechanism is movably arranged on the first guide rail along the length direction of the first guide rail; one end of the lifting mechanism is connected to the first translation mechanism, and the other end of the lifting mechanism is connected to the main suspension; The main suspension is connected to the cantilever, and the cantilever is rotatably adjustable relative to the main suspension; The heating roller and the pressing roller are respectively arranged on different cantilevers; the cantilever where the pressing roller is located is arranged close to the curved screen supporting platform.

3. The device according to claim 2, characterized in that The heating rollers include at least two; the cantilevers include at least three; the first heating roller is arranged on the first cantilever; the second heating roller is arranged on the second cantilever; the pressure roller is arranged on the third cantilever; When laminating, the first heating roller and the second heating roller are respectively used to simultaneously and continuously heat the two parts of the thermally deformable film layer corresponding to the same curved screen to be coated with a larger curvature.

4. The device according to claim 3, characterized in that The first cantilever is provided with a guide groove for adjusting the position of the first heating roller; the second cantilever is provided with a guide groove for adjusting the position of the second heating roller.

5. The device according to claim 3, characterized in that The heating rollers include at least three; the third heating roller is arranged on the main suspension.

6. The device according to claim 2, characterized in that The curved screen support platform includes a second translation mechanism; the device also includes a second guide rail; the second translation mechanism is movably arranged on the second guide rail along the length direction of the second guide rail.

7. The device according to claim 2, characterized in that The heating rollers include at least two and also include: a heat-conducting belt; the heat-conducting belt surrounds and covers the at least two heating rollers.

8. The device according to claim 1, characterized in that The film body further comprises a heat shrinkable film layer that shrinks when heated; the heat shrinkable film layer is arranged on a side of the heat deformable film layer away from the release film layer; When laminating, the heating roller is used to continuously heat the portion of the heat shrinkable film layer corresponding to the portion with a larger curvature of the curved screen to be coated.

9. A method for laminating a curved liquid crystal display screen, characterized in that: The method is implemented by a coating device for a curved liquid crystal display screen as described in any one of claims 1 to 8; The method comprises: S1, installing the curved screen to be covered on the curved screen support platform; S2, positioning the surface of the curved screen to be covered and setting the stroke of the pressing roller; S3, positioning the portion of the curved screen to be covered with a larger curvature, and determining the installation position of the heating roller; S4, the control component drives the film to unwind and feed the film once until the film is at a position corresponding to the heating roller; S5, continuously heating the portion of the thermally deformable film layer corresponding to the larger curvature of the curved screen to be covered by the heating roller; S6, the control component drives the film to unwind and perform secondary film feeding until the heated part of the film is at the position corresponding to the pressure roller; S7, the control component drives the movable roller support and drives the film to unwind according to the stroke of the pressing roller, so that the pressing roller and the curved screen to be covered abut against and move relative to each other, and the thermally deformable film layer on the outer side of the pressing roller adheres to the curved screen to be covered; S8, the control component drives the movable roller support to reset; S9, cooling the thermally deformable film layer, and removing the display screen to be coated after the coating is completed.

10. The method according to claim 9, characterized in that The heating rollers include at least two; The step of positioning the portion of the curved screen to be covered with a larger curvature to determine the installation position of the heating roller comprises: At least two parts of the curved screen to be covered with a larger curvature are positioned, and the installation positions of the at least two heating rollers are determined respectively.

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