阅读说明：本技术 一种曲面盖板和柔性膜的贴合工艺 (Laminating process of curved cover plate and flexible film ) 是由 刘方成 吕城龄 钱陈杨 孟令健 于 2019-04-17 设计创作，主要内容包括：本发明实施例提供一种曲面盖板和柔性膜的贴合工艺,包括：将曲面盖板固定,将柔性膜设置于承载膜上,并固定住承载膜的两端,使柔性膜与曲面盖板的内表面正对设置；采用第一滚轮顶住承载膜中部的一初始位置,使柔性膜的中部与曲面盖板的中部先贴合,再使第一滚轮向曲面盖板一侧弧边区域移动一预设距离；再采用第二滚轮从初始位置向曲面盖板另一侧弧边区域移动；以及使第一滚轮向曲面盖板的所述一侧弧边区域继续移动,以使柔性膜和曲面盖板完全贴合；在整个贴合过程中,控制承载膜的相对两端向减小承载膜拉力的方向进行配合运动。该贴合工艺适用于多种形状曲面盖板上柔性膜的贴合,即使是较大弯曲弧度的盖板,也具有高贴合质量和高贴合效率。(The embodiment of the invention provides a laminating process of a curved surface cover plate and a flexible film, which comprises the following steps: fixing the curved cover plate, arranging the flexible film on the bearing film, and fixing two ends of the bearing film to ensure that the flexible film is arranged opposite to the inner surface of the curved cover plate; the method comprises the following steps that a first roller is adopted to abut against an initial position of the middle part of a bearing film, so that the middle part of a flexible film is firstly attached to the middle part of a curved cover plate, and then the first roller moves a preset distance to an arc edge area on one side of the curved cover plate; then, a second roller is adopted to move from the initial position to the arc edge area on the other side of the curved surface cover plate; the first roller continuously moves towards the arc edge area at one side of the curved cover plate so as to completely attach the flexible film to the curved cover plate; in the whole attaching process, the two opposite ends of the bearing film are controlled to move in a matching way in the direction of reducing the tension of the bearing film. The laminating process is suitable for laminating the flexible films on the cover plates with the curved surfaces in various shapes, and even the cover plates with large bending radian have high laminating quality and high laminating efficiency.)

1. The laminating process of the curved surface cover plate and the flexible film is characterized by comprising the following steps of:

fixing a curved cover plate on a cover plate fixing piece, wherein the curved cover plate comprises a middle straight area and arc edge areas of two opposite side edges;

arranging a flexible film in the middle of a bearing film, fixing two ends of the bearing film by adopting a bearing film fixing device, and enabling the flexible film to be arranged opposite to the inner surface of the curved cover plate;

the method comprises the following steps that a first roller is adopted to abut against an initial position of the middle part of a bearing film, so that the middle part of a flexible film is firstly attached to the middle part of a curved surface cover plate, then the first roller moves a preset distance to an arc edge area on one side of the curved surface cover plate, and the flexible film and the curved surface cover plate are pressed;

then, a second roller is adopted to move from the initial position to the arc edge area on the other side opposite to the curved surface cover plate, and the flexible film and the curved surface cover plate are pressed; the first roller continuously moves towards the arc edge area on one side of the curved cover plate, and the flexible film and the curved cover plate are pressed to be completely attached;

in the whole attaching process, the two opposite ends of the bearing film are controlled to move in a matching manner in the direction of reducing the tension of the bearing film, so that the tension borne by the bearing film is within a preset tension range in the whole attaching process.

2. The bonding process of claim 1, wherein the first roller and the second roller have axial extension directions that are consistent with the extension directions of the pair of sides of the curved cover plate having the curved edge regions, and the axial lengths of the first roller and the second roller are greater than the lengths of the pair of sides of the curved cover plate having the curved edge regions.

3. The bonding process of claim 1, wherein the first roller and the second roller are cylindrical rollers, the first roller and the second roller are movable on the inner surface of the curved cover plate at the curved edge region, and the first roller and the second roller have a diameter in a range of 2mm to 5 mm.

4. The bonding process according to claim 3, wherein during the bonding process, the first roller and the second roller are driven to move in the horizontal direction by a horizontal displacement driving device, and the first roller and the second roller are driven to move in the vertical direction by a vertical displacement driving device.

5. The attaching process according to claim 4, wherein the attaching of the flexible film in the middle straight region of the curved cover plate is completed by driving the first roller and the second roller to move on the inner surface of the middle straight region of the curved cover plate by a horizontal displacement driving device; the first idler wheel is driven simultaneously through the horizontal displacement driving device and the vertical displacement driving device, the second idler wheel is driven simultaneously to move along the inner surfaces of the arc edge areas on the two sides of the curved surface cover plate, and the flexible films on the arc edge areas on the two sides of the curved surface cover plate are attached.

6. The bonding process of claim 1, wherein the first roller and the second roller are made of alloy steel.

7. The conforming process of claim 1 wherein the initial position corresponds to a substantially mid-way position of the flexible membrane and the curved cover sheet.

8. The attaching process according to claim 1, further comprising, during the movement of the first roller and the second roller on the inner surface of the flat region of the middle portion of the curved cover plate, supporting the first roller and the second roller with a first driven roller and a second driven roller, respectively; when the first roller and the second roller move to the arc edge areas of the two side edges of the curved cover plate, the first driven roller and the second driven roller are separated from the first roller and the second roller, and the first driven roller and the second driven roller exit from the attaching area.

9. The attaching process according to claim 8, wherein the first driven roller and the second driven roller are kept axially parallel to the first roller and the second roller, respectively, and are vertically aligned and attached to each other during the process of supporting the first roller and the second roller by the first driven roller and the second driven roller, respectively.

10. The attaching process according to claim 1, wherein the specific operation of controlling the opposite ends of the carrier film to perform the cooperative motion in the direction of reducing the tensile force of the carrier film so that the tensile force borne by the carrier film is within the preset tensile force range in the whole attaching process is as follows:

the method comprises the steps of adopting a tension sensor to sense tension borne by a carrier film in the whole laminating process in real time, and adopting a carrier film driving device to drive two opposite ends of the carrier film to move in a matching manner in the direction of reducing the tension of the carrier film, so that the tension borne by the carrier film is in a preset tension range in the whole laminating process.

11. The bonding process according to claim 1, wherein the operation of pressing the flexible film and the curved cover plate by moving the second roller from the initial position to the opposite curved side region of the curved cover plate is performed simultaneously with or in steps with the operation of moving the first roller to the one curved side region of the curved cover plate.

12. The attaching process according to claim 1, wherein the cover fixing member is provided with a groove for fixing the curved cover, and an inner surface of the groove is completely matched with an upper surface of the curved cover.

13. The lamination process according to claim 1, wherein the positioning of the flexible film opposite to the curved cover plate is performed by: and controlling the flexible film and the curved cover plate to be accurately aligned by adopting a CCD alignment system.

14. The conforming process of claim 1 wherein the first roller and the second roller are contoured rollers having surfaces conforming to the inner surface of the curved cover sheet.

15. The attaching process according to claim 14, wherein when the first roller and the second roller are profiling rollers, the first roller and the second roller are driven by a horizontal displacement driving device to move along a horizontal direction, so that the attaching of the flexible films in the middle straight region and the two side arc edge regions of the curved cover plate is completed.

Technical Field

The embodiment of the invention relates to the technical field of flexible screen laminating, in particular to a laminating process of a curved surface cover plate and a flexible film.

Background

With the continuous mass production of flexible screens, the application of flexible screens will grow explosively in the future. How to attach the flexible screen to the cover glass with the protection function in a high-efficiency and high-quality mode, especially the curved-surface 3D cover glass, becomes the core technology and the core competitiveness in the display field.

At present, the existing method for attaching the flexible screen to the curved cover plate glass comprises the following steps: set up a laminating part in flexible screen below, promote through a deformation control part laminating part upward movement, after flexible screen and curved surface glass cover plate internal surface contact, laminating part takes place to warp and fills up the region of buckling gradually to promote flexible screen and the laminating of glass cover plate in the region of buckling. In the attaching method, the shape of the attaching component has great influence on the attaching result, and when the bending radian of the cover plate glass is increased, the deformation of the attaching component is difficult to be ensured to fill the bending area, so that the attaching quality is influenced; moreover, the method usually needs to verify the design of a plurality of fitting parts, and the fitting trial and error cost is high and the time is long. Therefore, in order to better satisfy the appearance requirement of the screen with a large bending radian, a more efficient, more convenient and more reliable attaching scheme needs to be found.

Disclosure of Invention

In view of this, embodiments of the present invention provide a process for attaching a curved cover plate to a flexible film, in which two sets of rollers move along an inner surface of the curved cover plate to attach the flexible film to the curved cover plate, and the attaching process is suitable for various curved cover plate shapes, especially cover plates with a large curvature, so as to solve the problem that in the prior art, when the curvature of the cover plate is large, the attaching requirement is difficult to meet to a certain extent.

Specifically, in a first aspect, an embodiment of the present invention provides a process for attaching a curved cover plate to a flexible film, including the following steps:

fixing a curved cover plate on a cover plate fixing piece, wherein the curved cover plate comprises a middle straight area and arc edge areas of two opposite side edges;

arranging a flexible film in the middle of a bearing film, fixing two ends of the bearing film by adopting a bearing film fixing device, and enabling the flexible film to be arranged opposite to the inner surface of the curved cover plate;

the method comprises the following steps that a first roller is adopted to abut against an initial position of the middle part of a bearing film, so that the middle part of a flexible film is firstly attached to the middle part of a curved surface cover plate, then the first roller moves a preset distance to an arc edge area on one side of the curved surface cover plate, and the flexible film and the curved surface cover plate are pressed;

then, a second roller is adopted to move from the initial position to the arc edge area on the other side opposite to the curved surface cover plate, and the flexible film and the curved surface cover plate are pressed; the first roller continuously moves towards the arc edge area on one side of the curved cover plate, and the flexible film and the curved cover plate are pressed to be completely attached;

in the whole attaching process, the two opposite ends of the bearing film are controlled to move in a matching manner in the direction of reducing the tension of the bearing film, so that the tension borne by the bearing film is within a preset tension range in the whole attaching process.

In an embodiment of the present invention, an axial extending direction of the first roller and the second roller is the same as an extending direction of a pair of sides of the curved cover plate having the arc-shaped edge region, and an axial length of the first roller and the second roller is greater than a length of a pair of sides of the curved cover plate having the arc-shaped edge region.

In an embodiment of the present invention, the first roller and the second roller are cylindrical rollers, the first roller and the second roller are movable on an inner surface of an arc edge area of the curved cover plate, and diameters of the first roller and the second roller are in a range of 2mm to 5 mm.

In the embodiment of the invention, in the attaching process, the first roller and the second roller are driven to move along the horizontal direction by the horizontal displacement driving device, and the first roller and the second roller are driven to move along the vertical direction by the vertical displacement driving device.

In the implementation mode of the invention, the first roller and the second roller are driven by a horizontal displacement driving device to move on the inner surface of the middle straight area of the curved cover plate, so that the flexible film is attached to the middle straight area of the curved cover plate; and simultaneously driving the first roller and the second roller to move along the inner surfaces of the arc edge areas at the two sides of the curved surface cover plate through a horizontal displacement driving device and a vertical displacement driving device, so as to complete the lamination of the flexible films at the arc edge areas at the two sides of the curved surface cover plate.

In an embodiment of the present invention, the first roller and the second roller are made of alloy steel.

In the embodiment of the invention, the initial position corresponds to the middle position of the flexible film and the curved cover plate.

In an embodiment of the present invention, the attaching process further includes, when the first roller and the second roller move on the inner surface of the straight area in the middle of the curved cover plate, respectively supporting the first roller and the second roller by using a first driven roller and a second driven roller; when the first roller and the second roller move to the arc edge areas of the two side edges of the curved cover plate, the first driven roller and the second driven roller are separated from the first roller and the second roller, and the first driven roller and the second driven roller exit from the attaching area.

In the implementation mode of the invention, in the process of supporting the first roller and the second roller by respectively adopting the first driven roller and the second driven roller, the first driven roller and the second driven roller are respectively kept in parallel with the first roller and the second roller in the axial direction and are opposite and attached to each other in the vertical direction.

In an embodiment of the present invention, the specific operation of controlling the two opposite ends of the carrier film to perform a cooperative motion in a direction of reducing the tensile force of the carrier film so that the tensile force borne by the carrier film is within a preset tensile force range in the whole attaching process is as follows:

the method comprises the steps of adopting a tension sensor to sense tension borne by a carrier film in the whole laminating process in real time, and driving two opposite ends of the carrier film to move in a matching manner in the direction of reducing the tension of the carrier film through a carrier film driving device so as to enable the tension borne by the carrier film to be within a preset tension range in the whole laminating process.

In an embodiment of the present invention, the operation of pressing the flexible film and the curved cover plate by moving the second roller from the initial position to the arc region on the other side of the curved cover plate is performed synchronously with or step by step with the operation of continuously moving the first roller to the arc region on the one side of the curved cover plate.

In the embodiment of the invention, the cover plate fixing piece is provided with a groove for fixing the curved cover plate, and the inner surface of the groove is completely matched with the upper surface of the curved cover plate.

In an embodiment of the present invention, the specific operation of disposing the flexible film opposite to the inner surface of the curved cover plate is: and controlling the flexible film and the curved cover plate to be accurately aligned by adopting a CCD alignment system.

In an embodiment of the present invention, the first roller and the second roller are profiling rollers, and the profiling rollers have surfaces adapted to the inner surface of the curved cover plate.

In the embodiment of the invention, when the first roller and the second roller are profiling rollers, the first roller and the second roller are driven by a horizontal displacement driving device to move along the horizontal direction, so that the flexible films in the middle straight area and the two side arc edge areas of the curved cover plate are attached.

The laminating process provided by the embodiment of the invention is simple to operate, high in laminating quality and high in laminating efficiency.

Drawings

Fig. 1 is a schematic view of a process flow for attaching a curved cover plate and a flexible film according to an embodiment of the present invention;

fig. 2 is a schematic view of a process flow for attaching the curved cover plate and the flexible film according to another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a carrier film clamping mechanism according to an embodiment of the invention;

FIG. 4 is a schematic cross-sectional view of a profiling roller in an embodiment of the invention;

FIG. 5 is a schematic view of a profiling roller for applying in one embodiment of the present invention;

FIG. 6 is a schematic view of another embodiment of the present invention using a profiling roller for applying.

Detailed Description

The embodiments of the present invention will be described below with reference to the drawings.

As shown in fig. 1, an embodiment of the present invention provides a process for attaching a curved cover plate to a flexible film, including the following steps:

s101, fixing a curved cover plate 3 on a cover plate fixing piece (not shown in the figure), wherein the curved cover plate 3 comprises a middle straight area and arc edge areas positioned at two opposite side edges;

s102, arranging a flexible film 2 in the middle of a carrier film 1, fixing two ends of the carrier film 1 by using a carrier film fixing device 4, and enabling the flexible film 2 to be arranged opposite to the inner surface of the curved cover plate 3;

s103, the first roller 31 is adopted to prop against an initial position A of the middle part of the carrier film 1, so that the middle part of the carrier film 1 is bent, and the middle part of the flexible film 2 (namely the flexible film corresponding to the initial position A) is firstly attached to the middle part of the curved cover plate 3;

s104, moving the first roller 31 to a position B by a preset distance towards an arc edge area on one side of the curved cover plate 3, and pressing the flexible film 2 and the curved cover plate 3;

s105, moving from the initial position A to the arc edge area on the other side opposite to the curved cover plate 3 by using a second roller 32, pressing the flexible film 2 and the curved cover plate 3, and withdrawing from the bonding area; the first roller 31 is enabled to continuously move towards the arc edge area on one side of the curved cover plate 3, the flexible film 2 and the curved cover plate 3 are pressed, so that the flexible film 2 and the curved cover plate 3 are completely attached, and the attachment area is withdrawn;

according to the embodiment of the invention, the two groups of rollers are adopted to respectively move the flexible film and the curved surface cover plate from the middle part of the curved surface cover plate to the arc edge areas at two sides, so that the laminating efficiency can be improved, and the laminating quality can be improved.

In the whole laminating process, a carrier film driving device is adopted to drive the two opposite ends of the carrier film 1 to perform matching motion in the direction of reducing the tensile force of the carrier film, so that the tensile force borne by the carrier film 1 is in a preset tensile force range in the whole laminating process.

In the embodiment of the invention, the flexible film is a flexible screen, a protective film, a radiating fin and the like. The curved cover plate can be made of glass, ceramics, plastics and the like. The size of flexible membrane with the cooperation of curved surface apron size sets up.

In order to prevent the first roller 321 from being restricted in movement, the first roller 321 can press the entire curved cover plate 3 during the attaching process, so as to ensure the attaching quality. In the embodiment of the present invention, the axial extending direction of the first roller 31 and the second roller 32 is the same as the extending direction of the pair of sides of the curved cover plate 3 having the arc edge region, and the axial length of the first roller 31 and the second roller 32 is greater than the length of the pair of sides of the curved cover plate 3 having the arc edge region. It will be appreciated that the axial length of the first roller 31 and the second roller 32 should also be greater than the length of the corresponding sides of the cover mount (i.e., the sides corresponding to the pair of sides of the curved cover having the curved edge regions). The cover plate fixing piece is provided with a groove for fixing the curved cover plate 3, and the inner surface of the groove is completely matched with the upper surface of the curved cover plate 3. It is understood that, in the present invention, the inner surface of the curved cover 3 refers to one side surface to which the flexible film is to be attached, and the upper surface is the other side surface opposite to the one side surface to which the flexible film is to be attached.

In the embodiment of the present invention, the first roller 31 and the second roller 32 are cylindrical rollers, and the first roller 31 and the second roller 32 can move on the inner surface of the arc edge area of the curved cover plate; in order to make the first roller 31 and the second roller 32 smoothly move along the inner surface of the curved edge region of the curved cover plate 3, the radius of the first roller 31 and the radius of the second roller 32 are controlled to be smaller than the curvature radius of the curved edge region of the curved cover plate 3. Specifically, the diameters of the first roller 31 and the second roller 32 are in the range of 2mm to 5 mm.

In the embodiment of the present invention, in the attaching process, the horizontal displacement driving device drives the first roller 31 and the second roller 32 to move in the horizontal direction, and the vertical displacement driving device drives the first roller 31 and the second roller 32 to move in the vertical direction. Specifically, the first roller 31 and the second roller 32 are driven by the horizontal displacement driving device to move on the inner surface of the middle straight area of the curved cover plate 3, so that the flexible film is attached to the middle straight area of the curved cover plate 3; the first idler wheel 31 is driven simultaneously through a horizontal displacement driving device and a vertical displacement driving device, the second idler wheel 32 is driven simultaneously to move along the inner surfaces of the arc edge areas on the two sides of the curved surface cover plate 3, and the flexible films on the arc edge areas on the two sides of the curved surface cover plate 3 are attached.

In the whole attaching process, the first roller 31 and the second roller 32 are controlled to be in contact with the bearing film 1, the first roller 31 and the second roller 32 move along the inner surface of the curved cover plate 3, the first roller 31 and the second roller 32 can translate or roll relative to the bearing film 1 to press the flexible film 2 on the inner surface of the curved cover plate 3, and the motion track curves of the first roller 31 and the second roller 32 are determined by the contour of the inner surface of the curved cover plate 3. When the first roller 31 and the second roller 32 move on the inner surface of the flat area of the curved cover plate, the first roller 31 and the second roller 32 have displacement in the horizontal direction; when the first roller 31 and the second roller 32 move on the inner surface of the arc edge area of the curved cover plate, the first roller 31 and the second roller 32 have displacements in the horizontal direction and the vertical direction.

In the embodiment of the present invention, in order to ensure that the first roller 31 and the second roller 32 can provide a suitable pressure for the good adhesion between the curved cover plate 3 and the flexible film 2, the first roller 31 and the second roller 32 may be made of a material having a hardness HRD greater than 20, and may specifically include alloy steel.

In the embodiment of the present invention, in step S104, the preset distance may be determined according to the diameter size of the first roller 31 and the second roller 32 and the size of the curved cover 3, and in principle, the preset distance is required to be larger than the sum of the radii of the first roller 31 and the second roller 32, so that the first roller 31 does not hinder the second roller 32 from reaching the initial position a after moving to the position B.

In the embodiment of the invention, in order to balance the stress in the attaching process, the attaching quality is improved. Optionally, the initial position a corresponds to a position directly in the middle of the flexible membrane 2 and the curved cover plate 3. In the embodiment of the present invention, the operation of pressing the flexible film 2 and the curved cover plate 3 by moving the second roller 32 from the initial position a to the arc region on the other side opposite to the curved cover plate 3 and the operation of continuously moving the first roller 31 to the arc region on the one side of the curved cover plate 3 may be performed simultaneously or step by step. Namely, after the second roller 32 reaches the initial position a, the first roller 31 and the second roller 32 can be driven to move towards the arc edge areas on the two opposite sides of the curved cover plate 3 simultaneously or sequentially to complete the attachment. Specifically, in an embodiment of the present invention, as shown in fig. 1, after the second roller 32 reaches the initial position a, the second roller 32 is kept still at the position a, and the first roller 31 is moved from the position B to the arc edge area on one side of the curved cover plate 3 to the bonding exit area, and then the second roller 32 is driven to move to the arc edge area on the other side of the curved cover plate 3 to complete bonding, but in other embodiments, the first roller 31 may be kept still at the position B, the second roller 32 is moved from the position a to the arc edge area on the other side of the curved cover plate 3 to complete bonding, and then the first roller 31 is driven from the position B to the arc edge area on one side of the curved cover plate 3 to the bonding exit area. In another embodiment of the present invention, after the second roller 32 reaches the initial position a, the first roller 31 and the second roller 32 are driven to move towards the arc edge regions of the two opposite side edges of the curved cover plate 3 to complete the attachment. According to the embodiment of the invention, the two groups of rollers are adopted for bonding, so that the bonding of the flexible film and the curved cover plate can be well controlled, the generation of bad phenomena such as wrinkling and displacement is avoided, and the bonding quality and the bonding efficiency are improved.

Since the diameters of the first roller 31 and the second roller 32 are small, bending deformation and the like are likely to occur in the attaching process, so that the pressure is insufficient, and poor attachment is caused. In order to effectively prevent the poor adhesion phenomenon, in the embodiment of the present invention, as shown in fig. 2, when the first roller 31 and the second roller 32 move on the inner surface of the flat area in the middle of the curved cover plate 3, a first driven roller 41 and a second driven roller 42 are respectively used to support the first roller 31 and the second roller 32, and the first driven roller 41 and the second driven roller 42 are respectively arranged in parallel with the first roller 31 and the second roller 32 in the axial direction. In order to provide sufficient effective supporting force, the first driven roller 41 and the second driven roller 42 are kept to be vertically opposite to and attached to the first roller 31 and the second roller 32 respectively. When the first roller 31 and the second roller 32 move to the arc edge areas of the two side edges of the curved cover plate 3, the driving device respectively drives the first driven roller to separate from the first roller, and the second driven roller to separate from the second roller, so that the first driven roller and the second driven roller exit from the bonding area. In the embodiment of the invention, when the first roller 31 and the second roller 32 roll relative to the carrier film 1, the first driven roller 41 and the second driven roller 42 can be driven to synchronously rotate in opposite directions, and the synchronous rotation in opposite directions can reduce the friction between the first roller 31 and the second roller 32 and the carrier film 1, which is beneficial to improving the bonding quality. It is understood that the first driven roller 41 and the second driven roller 42 are respectively located on the sides of the first roller 31 and the second roller 32 away from the curved cover plate.

In the embodiment of the present invention, the specific structure of the carrier film fixing device 4 is not limited as long as the two opposite ends of the carrier film can be fixed, and the carrier film fixing device may specifically be a clamping mechanism or a roller mechanism, and the two ends of the carrier film are clamped on the clamping mechanism or wound and fixed on the roller mechanism. As shown in fig. 3, in an embodiment of the present invention, the clamping mechanism includes a first clamping plate 51 and a second clamping plate 52, the first clamping plate 51 is provided with a plurality of fixing posts 511, the second clamping plate 52 is provided with a plurality of through holes corresponding to the plurality of fixing posts 511, and when the opposite ends of the carrier film are clamped between the first clamping plate and the second clamping plate, the plurality of fixing posts are inserted into the plurality of through holes. It can be understood that, in order to enable the carrier film to be well clamped between the first clamping plate and the second clamping plate, a plurality of holes corresponding to the plurality of fixing posts 511 are required to be arranged at two opposite ends of the carrier film, and the carrier film is sleeved on the fixing posts 511 through the plurality of holes.

In the embodiment of the invention, in order to avoid the situation that the carrier film and the flexible film are damaged due to over-tension in the attaching process, the carrier film driving device is adopted to drive the two opposite ends of the carrier film 1 to perform matching motion in the direction of reducing the tensile force of the carrier film, so that the tensile force borne by the carrier film 1 is in the preset tensile force range in the whole attaching process. Specifically, in the embodiment of the invention, the tension sensor is adopted to sense the tension borne by the carrier film in the whole attaching process in real time, and the controller controls the carrier film driving device to drive the two opposite ends of the carrier film to move in a matching manner in the direction of reducing the tension of the carrier film, so that the tension borne by the carrier film is in the preset tension range in the whole attaching process. As shown in fig. 1 and fig. 2, in the embodiment of the invention, during the attaching process, the carrier film driving device drives the opposite ends of the carrier film 1 to approach the curved cover plate 3, so as to reduce the tensile force of the carrier film 1. In the embodiment of the invention, the carrier film driving device drives the two ends of the carrier film to move in the direction of reducing the tensile force of the carrier film by controlling the movement of the carrier film fixing device. The carrier film driving device may be a servo motor. In the embodiment of the invention, the bearing film driving device drives the two opposite ends of the bearing film 1 to move simultaneously, so that the flexible film at the position where the roller is not pressed does not contact with the curved cover plate.

In the embodiment of the invention, in the attaching process, the curved cover plate can be positioned above the flexible film, the roller pushes the flexible film to be attached to the curved cover plate from the lower part of the flexible film, or the curved cover plate can be positioned below the flexible film, and the roller presses the flexible film to be attached to the curved cover plate from the upper part. In order to better control the flexible film at the position where the roller is not pressed not to contact with the curved cover plate and avoid poor fitting, in a preferred embodiment of the invention, the curved cover plate is positioned above the flexible film, and the roller pushes the flexible film to fit with the curved cover plate from the lower part of the flexible film.

In the embodiment of the invention, a CCD (charge coupled device) alignment system is adopted to control the flexible film and the curved cover plate to be aligned accurately, so that the flexible film and the curved cover plate are arranged oppositely.

In another embodiment of the present invention, the first roller 31 and the second roller 32 are profile rollers having a surface adapted to the inner surface of the curved cover plate. Specifically, as shown in fig. 4, in particular, the profiling roller 350 includes a first surface 351 completely matching with the inner surface of the arc edge region of the curved cover plate and a second surface 352 smoothly transiting to the first surface 351, wherein the second surface 352 is a flat surface for pressing the flexible film on the flat region of the curved cover plate. The profiling roller 350 further comprises a third surface 353 in smooth transition connection with the second surface 352, wherein the third surface 353 is far away from the arc edge area of the curved cover plate. The shape of the third surface 353 is not particularly limited. As shown in fig. 5, when the third surfaces of the two profiling rollers cannot be seamlessly spliced together, the roller driving device can drive one roller pressing piece to reach an initial position at the middle part of the curved cover plate first, and move a preset distance to the arc edge area at one side of the curved cover plate, so that the flexible film is attached to the middle part of the curved cover plate first; and driving the other roller pressing piece to reach the initial position, and driving the two roller pressing pieces to respectively move towards the arc edge areas on the two sides of the curved surface cover plate so as to push the flexible films on the two sides to be attached to the curved surface cover plate. As shown in fig. 6, when the third surfaces of the two profiling rollers can be seamlessly spliced together, the roller driving device can drive the two roller pressing pieces to simultaneously reach a designated position in the middle of the curved cover plate, and then the two roller pressing pieces respectively move towards the arc edge areas on the two sides.

In the embodiment of the invention, when the first roller and the second roller are profiling rollers, the first roller and the second roller are driven by a horizontal displacement driving device to move along the horizontal direction, so that the flexible films in the middle straight area and the two side arc edge areas of the curved cover plate are attached. Because the profiling rollers are adopted, the first rollers and the second rollers can complete the laminating of a straight area and an arc edge area only by performing horizontal motion on the inner surface of the curved surface cover plate, the first rollers and the second rollers are set to be the profiling rollers, a curved path can be avoided, the control difficulty of the movement track of the rollers is greatly reduced, and the laminating efficiency is improved.