Hard screen body assembly full-lamination method

Abstract

The invention relates to a hard screen body assembly full-lamination method, which comprises the following steps: S1, providing a first hard screen body, and arranging a first adhesive layer on the first surface of the first hard screen body; s2, providing a second hard screen body, and arranging a plurality of salient points on the first surface of the second hard screen body; s3, pre-laminating operation is executed, so that each salient point and the first adhesive layer form temporary bonding, the alignment relation between the first hard screen body and the second hard screen body is temporarily fixed and determined, each salient point forms a gap between the first adhesive layer and the second hard screen body, and a pre-laminating assembly is manufactured; s4, transferring the pre-laminated assembly into the closed cavity, and vacuumizing to completely extract residual gas in the gap; and S5, performing pressing operation on the pre-laminated assembly in a vacuum environment, so that the salient points are pressed into the first adhesive layer until the gaps are completely eliminated, bubble-free full lamination is realized, and the hard screen body assembly is obtained. The process difficulty can be reduced, and the production efficiency can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of display technologies, and particularly relates to a full lamination method for a rigid screen body assembly. Background Art

[0002] Currently, in the manufacturing process of a display screen, generally, a full lamination process for a rigid screen body assembly needs to be completed, that is, a lamination process in which a transparent adhesive layer completely fills between the mutually laminated rigid screen bodies, aiming to eliminate the air layer between the rigid screen bodies, thereby reducing the reflection of the air layer, and thus improving the contrast and viewing experience of the display screen in a bright environment. The full lamination process for the rigid screen body assembly generally needs to be carried out in a vacuum environment to exclude the air between the rigid screen bodies.

[0003] However, the existing full lamination process for the rigid screen body assembly is generally completed by a laminator. Its alignment and lamination operations are carried out after each rigid screen body assembly (the rigid screen body assembly includes a first rigid screen body and a second rigid screen body) is fed into the vacuum chamber. Therefore, the production efficiency is very low. Especially when laminating multiple batches of rigid screen body assemblies, each lamination requires evacuation before operation, and it is difficult to meet the requirements of batch production. When there are two or more first rigid screen bodies and 2-to-1 lamination or N-to-1 lamination needs to be carried out, the production efficiency is even lower. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a full lamination method for a rigid screen body assembly, which can reduce the process difficulty and greatly improve the production efficiency. The adopted technical solution is as follows: A full lamination method for a rigid screen body assembly, characterized by comprising the following steps: S1. Provide a first rigid screen body, and provide a first adhesive layer on a first surface of the first rigid screen body; S2. Provide a second rigid screen body, and provide a plurality of bumps on a first surface of the second rigid screen body; S3. Perform a pre-lamination operation, relatively arrange and move closer a first surface of the second rigid screen body and a first surface of the first rigid screen body, so that each bump on the second rigid screen body forms a temporary bond with the first adhesive layer on the first rigid screen body, to temporarily fix and determine the alignment relationship between the first rigid screen body and the second rigid screen body, and each bump forms a gap between the first adhesive layer and the first surface of the second rigid screen body, thereby obtaining a pre-laminated assembly; S4. Transfer the pre-laminated assembly into a closed chamber and evacuate the closed chamber to completely remove the residual gas in the gap, so that the pre-laminated assembly is in a vacuum environment; S5. Perform a pressing operation on the pre - bonded component in a vacuum environment, apply a directional pressure to the first rigid screen body or the second rigid screen body, so that the second rigid screen body undergoes a relative displacement towards the first rigid screen body, causing the bumps on the second rigid screen body to press into the first adhesive layer on the first rigid screen body until the gap is completely eliminated, achieving bubble - free full bonding between the first rigid screen body and the second rigid screen body, and obtaining the rigid screen body component.

[0005] The first rigid screen body and the second rigid screen body can be a display screen, a touch screen, a protective lens, or any rigid screen body component used in a display screen. Specifically, the first rigid screen body is a liquid crystal display screen, and the second rigid screen body is a protective lens made of glass.

[0006] In the above - mentioned full - bonding method of the rigid screen body component, in step S3, after the first surface of the first rigid screen body and the first surface of the second rigid screen body are arranged opposite to each other, a small pressure can be applied to the first rigid screen body or the second rigid screen body, or gravity can be utilized, or only the adhesive force of the first adhesive layer itself can be utilized to make the first rigid screen body and the second rigid screen body approach each other, so that each bump on the second rigid screen body forms a temporary bond with the surface of the first adhesive layer on the first rigid screen body, thereby realizing the pre - bonding operation of the first rigid screen body and the second rigid screen body. At this time, based on the bonding effect between the top of the bump and the first adhesive layer, the first rigid screen body and the second rigid screen body will not slide relative to each other, realizing temporary fixation and determining the alignment relationship between the first rigid screen body and the second rigid screen body, and obtaining a pre - bonded component; since steps S1 - S3 can all be operated in an atmospheric environment, the operation environment is loose, the operation is more flexible, and there is no need to involve large - scale equipment, reducing the process difficulty; in steps S4 - S5, the pre - bonded component is transferred to a vacuum environment, and a pressing operation is performed on the pre - bonded component in the vacuum environment, so that the bumps on the second rigid screen body press into the first adhesive layer on the first rigid screen body until the gap is completely eliminated, achieving bubble - free full bonding between the first rigid screen body and the second rigid screen body.

[0007] Specifically, when performing the pre-bonding operation of the first rigid screen body and the second rigid screen body, the assistance of the alignment jig can be relied on to achieve the mutual alignment of the first rigid screen body and the second rigid screen body. For example, an alignment jig with double-layer positioning grooves can be used. First, the first rigid screen body is positioned and placed in the bottom-layer positioning groove, and then the second rigid screen body is placed in the top-layer positioning groove. The depths of the bottom-layer positioning groove and the top-layer positioning groove are designed such that the bonding surfaces of the first rigid screen body and the second rigid screen body come into contact, realizing the positioning pre-bonding of the first rigid screen body and the second rigid screen body. It is also possible to first place the second rigid screen body in a specific position, and then use a manipulator and a suction cup to grab the first rigid screen body. By capturing the alignment features or alignment marks (preset in the first rigid screen body and the second rigid screen body respectively) of the first rigid screen body and the second rigid screen body through a camera, and then positioning and placing the first rigid screen body on top of the second rigid screen body, realizing the positioning pre-bonding of the first rigid screen body and the second rigid screen body.

[0008] As a preferred solution of the present invention, the first adhesive layer is a paste or semi-solid transparent adhesive layer. Specifically, the first adhesive layer can be a transparent adhesive layer mainly based on acrylate, and its refractive index generally matches that of the glass substrate. Thus, in step S3, each bump on the second rigid screen body can be within the first adhesive layer to achieve the temporary bonding of the bump and the first adhesive layer, temporarily fixing the alignment relationship between the first rigid screen body and the second rigid screen body, and ensuring that it will not be completely embedded in the first adhesive layer, which is beneficial to forming the gap between the first adhesive layer and the second rigid screen body.

[0009] As a further preferred solution of the present invention, the viscosity coefficient of the first adhesive layer is not less than 15000 centipoise (cP).

[0010] As a preferred solution of the present invention, in step S3, the bumps are provided on the first surface of the first rigid screen body by printing or patterning. The bumps can be formed on the first surface of the first rigid screen body by printing (such as printing), or can be formed by pre-coating a photosensitive resin on the first surface of the first rigid screen body and then patterning it by exposure and development. Specifically, the bumps can be presented as a dot matrix, and the height of the bumps generally does not exceed the thickness of the first adhesive layer.

[0011] As a further preferred solution of the present invention, the top of the bump is non-planar. The bumps can be made smaller, and the photosensitive resin bumps can also be softened by heat baking, so that the top of the bumps presents a non-planar shape. Thus, in step S5, it is easy to press the bumps into the first adhesive layer.

[0012] As another preferred embodiment of the present invention, in step S2, a second adhesive layer is first provided on the first surface of the second rigid screen body, and then powder is spread on the surface of the second adhesive layer. The powder adheres to the second adhesive layer to form the bump. Thus, there is no need to pre-fabricate bumps on the first surface of the second rigid screen body, and it can be suitable for the first surfaces of more materials of the second rigid screen body. For example, the first surface of the second rigid screen body can be a plastic surface. Since the powder is spread after the second adhesive layer, its lateral dimension is smaller, and in step S5, it is more easily pressed into the first adhesive layer (which can also be the second adhesive layer).

[0013] As a further preferred embodiment of the present invention, the powder is silicon balls, glass powder or plastic powder. Specifically, the powder is a spacer (SPACER) and related spreading process used in the liquid crystal display industry, and its distribution density can reach 10 - 300 pieces / cm². Specifically, the powder can be spherical, strip-shaped or irregularly shaped particles, and the powder can be selected with particles of the same size, such as particles with a size of about 50 μm, so as to enable the bumps to form a gap with a relatively uniform thickness at various positions between the first adhesive layer and the first surface of the second rigid screen body in step S3.

[0014] As a further preferred embodiment of the present invention, the height of the powder does not exceed the sum of the thicknesses of the first adhesive layer and the second adhesive layer. This can ensure that the powder can be completely embedded into the first adhesive layer and the second adhesive layer in step S5, so as to facilitate the complete fitting of the first adhesive layer and the second rigid screen body.

[0015] As a further preferred embodiment of the present invention, the height of the powder is 30% - 70% of the sum of the thicknesses of the first adhesive layer and the second adhesive layer.

[0016] As a further preferred embodiment of the present invention, the thickness of the second adhesive layer is 80% - 120% of the first adhesive layer. Thus, in step S5, the powder can be pressed into both the first adhesive layer and the second adhesive layer at the same time, the deformation of the adhesive layer is smaller, the stress of the adhesive layer is reduced, and the fitting stability is improved.

[0017] As a preferred embodiment of the present invention, the number of the first rigid screen bodies provided in the step S1 is at least two; in the step S3, the first surfaces of the first rigid screen bodies are arranged opposite to the first surface of the second rigid screen body, and the first adhesive layers on the first rigid screen bodies are temporarily adhered to the respective bumps on the second rigid screen body to fix the alignment relationship between the first rigid screen bodies and the second rigid screen body; in the step S5, a directional pressure is applied to each of the first rigid screen bodies, so that each of the first rigid screen bodies undergoes a relative displacement towards the second rigid screen body, and the bumps on the second rigid screen body are pressed into the first adhesive layers on the first rigid screen bodies until the gap is completely eliminated, realizing bubble-free full lamination between the first rigid screen bodies and the second rigid screen body, and obtaining the rigid screen body assembly.

[0018] As a preferred embodiment of the present invention, before performing the step S4, the steps S1-S3 are repeated to prepare a plurality of the pre-laminated assemblies; in the step S4, the plurality of the pre-laminated assemblies are moved into the same closed cavity together and the closed cavity is evacuated, so that the gas remaining in the gaps on the plurality of the pre-laminated assemblies is completely removed; in the step S5, a lamination operation is performed on the plurality of the pre-laminated assemblies simultaneously to obtain a plurality of the rigid screen body assemblies. The pre-laminated assemblies prepared in the steps S1-S3 can be temporarily stored, and when a certain number is reached, they are sent to the vacuum cavity to perform the steps S4 and S5. Thus, the lamination operation on the plurality of the pre-laminated assemblies can be completed at one time, and the efficiency is greatly improved.

[0019] As a further preferred embodiment of the present invention, in the step S4, the plurality of the pre-laminated assemblies are first placed vertically and stacked together in the transverse direction, and then these stacked pre-laminated assemblies are moved into the same closed cavity together; in the step S5, a transverse pressure is applied to these pre-laminated assemblies, and the lamination operation on these pre-laminated assemblies is completed simultaneously.

[0020] Compared with the prior art, the present invention has the following advantages: This method for full lamination of the rigid screen body assembly first performs a pre-lamination operation on the first rigid screen body and the second rigid screen body, uses the bumps to adhere and temporarily fix to determine the alignment relationship between the first rigid screen body and the second rigid screen body to form a pre-laminated assembly, and then performs a lamination operation on the pre-laminated assembly in a vacuum environment to realize bubble-free full lamination between the first rigid screen body and the second rigid screen body. Since the alignment and full lamination of the rigid screen body are completed step by step, and the steps S1-S3 are all operated in the atmospheric environment, the operation environment is loose, the operation is more free, there is no need to involve large equipment, the process difficulty is reduced, the production efficiency can be greatly improved, the degree of freedom of process combination is also improved, and it is suitable for the 2-to-1 lamination or N-to-1 lamination process of the rigid screen body. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic flow chart of the full lamination method for a rigid screen body assembly provided in the first embodiment of the preferred embodiment of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the rigid screen body assembly obtained in the first embodiment of the preferred embodiment of the present invention.

[0023] Figure 3 It is a schematic flow chart of the full lamination method for a rigid screen body assembly provided in the second embodiment of the preferred embodiment of the present invention. Detailed implementation manners

[0024] In the first embodiment, as Figure 1 - Figure 2 shown, this full lamination method for a rigid screen body assembly includes the following steps: S1. Provide a first rigid screen body 1, and provide a first adhesive layer 101 on the first surface of the first rigid screen body 1; S2. Provide a second rigid screen body 2, and provide a plurality of bumps 201 on the first surface of the second rigid screen body 2; S3. Perform a pre-lamination operation, set the first surface of the second rigid screen body 2 opposite to and close to the first surface of the first rigid screen body 1, so that each bump 201 on the second rigid screen body 2 forms a temporary bond with the first adhesive layer 101 on the first rigid screen body 1, to temporarily fix and determine the alignment relationship between the first rigid screen body 1 and the second rigid screen body 2. Each bump 201 forms a gap 120 between the first adhesive layer 101 and the first surface of the second rigid screen body 2, and a pre-laminated assembly 3 is obtained; S4. Transfer the pre-laminated assembly 3 into a closed cavity 4 and evacuate the closed cavity 4 to completely remove the residual gas in the gap 120, so that the pre-laminated assembly 3 is in a vacuum environment 40; S5. Perform a lamination operation on the pre-laminated assembly 3 in the vacuum environment 40, apply a directional pressure to the first rigid screen body 1 or the second rigid screen body 2, so that the second rigid screen body 2 undergoes a relative displacement towards the first rigid screen body 1, so that the bumps 201 on the second rigid screen body 2 are pressed into the first adhesive layer 101 on the first rigid screen body 1 until the gap 120 is completely eliminated, realizing bubble-free full lamination between the first rigid screen body 1 and the second rigid screen body 2, and obtaining the rigid screen body assembly.

[0025] In this embodiment, the first rigid screen body 1 is a liquid crystal display screen, and the second rigid screen body 2 is a protective lens made of glass.

[0026] In this embodiment, the first adhesive layer 101 is a transparent adhesive layer in a paste or semi-solid state, and the viscosity coefficient of the first adhesive layer 101 is not less than 15,000 centipoise (cP). Specifically, the first adhesive layer 101 is a transparent adhesive layer mainly composed of acrylate, and its refractive index generally matches that of the glass substrate. Therefore, in step S3, each convex point 201 on the second hard screen body 2 can be within the first adhesive layer 101 to achieve temporary bonding between the convex point 201 and the first adhesive layer 101 to temporarily fix the alignment relationship between the first hard screen body 1 and the second hard screen body 2, and ensure that it will not be completely embedded in the first adhesive layer 101, so as to facilitate the formation of a gap 120 between the first adhesive layer 101 and the second hard screen body 2.

[0027] In this embodiment, in step S3, the convex point 201 is set on the first surface of the first rigid screen body 1 by printing or graphic method, and the top of the convex point 201 is non-planar. The convex point 201 can be formed on the first surface of the first rigid screen body 1 by printing (such as printing), or it can be formed by pre-coating the first surface of the first rigid screen body 1 with photosensitive resin, and then graphicizing by exposure and development. Specifically, the convex point 201 can be presented as a dot matrix, and the height of the convex point 201 does not exceed the thickness of the first adhesive layer 101. The convex point 201 can be made smaller, and the convex point 201 of the photosensitive resin can also be softened by heat baking, so that the top of the convex point 201 is non-planar. Therefore, in step S5, it is easy to press the convex point 201 into the first adhesive layer 101.

[0028] In this embodiment, the number of first rigid screen bodies 1 provided in step S1 is two; in step S3, the first surfaces of the two first rigid screen bodies 1 are arranged opposite to the first surface of the second rigid screen body 2, and the first adhesive layers 101 on the two first rigid screen bodies 1 are temporarily bonded to the respective protrusions 201 on the second rigid screen body 2 to fix the alignment relationship between the two first rigid screen bodies 1 and the second rigid screen body 2; in step S5, directional pressure is applied to the two first rigid screen bodies 1 to make the two first rigid screen bodies 1 relatively displaced toward the second rigid screen body 2, so that the protrusions 201 on the second rigid screen body 2 are pressed into the first adhesive layers 101 on the two first rigid screen bodies 1 until the gap 120 is completely eliminated, thereby achieving bubble-free full bonding between the two first rigid screen bodies 1 and the second rigid screen body 2 to obtain a rigid screen assembly.

[0029] In this embodiment, before performing step S4, steps S1-S3 are repeated to obtain multiple pre-lamination components 3; in step S4, multiple pre-lamination components 3 are moved into the same closed cavity 4 together and the closed cavity 4 is evacuated to completely remove the residual gas in the gap 120 on multiple sets of pre-lamination components 3; in step S5, multiple pre-lamination components 3 are pressed at the same time to obtain multiple hard screen components. The pre-lamination components 3 made in steps S1-S3 can be temporarily stored, and when a certain number is reached, they can be sent to the vacuum cavity to perform steps S4 and S5, thereby completing the pressing operation of multiple pre-lamination components 3 at one time, and its efficiency is greatly improved.

[0030] In this embodiment, in step S4, a plurality of pre-laminated components 3 are first placed vertically and stacked together horizontally, and then the stacked pre-laminated components 3 are moved together into the same closed cavity 4; in step S5, a clamp 5 is used to apply lateral pressure to the pre-laminated components 3, and the pressing operation of the pre-laminated components 3 is completed at the same time.

[0031] Example 2, reference Figure 3 , when other parts are the same as those of the first embodiment, the difference is that: in the step S2, the second adhesive layer 202 is firstly provided on the first surface of the second rigid screen body 2, and then the powder 21 is sprinkled on the surface of the second adhesive layer 202, and the powder 21 adheres to the second adhesive layer 202 to form the convex point 201; in the step S3, a small pressure is applied to the first rigid screen body 1, so that the first rigid screen body 1 and the second rigid screen body 2 are close to each other. Therefore, it is not necessary to pre-make the convex point 201 on the first surface of the second rigid screen body 2, and it can be suitable for the first surface of the second rigid screen body 2 of more materials, for example, the first surface of the second rigid screen body 2 can be a plastic surface. Since the powder 21 is sprinkled on the second adhesive layer 202, its lateral size is smaller, and in the step S5, it is easier to be pressed into the first adhesive layer 101 (or the second adhesive layer 202).

[0032] In this embodiment, the powder 21 is silicon spheres, glass powder or plastic powder. Specifically, the powder 21 is a spacer (SPACER) and related spreading process used in the liquid crystal display industry, and its distribution density can reach 10-300 / cm². Specifically, the powder 21 is a spherical, strip-shaped or irregularly shaped particle. The powder 21 can be selected from particles of uniform size, such as particles of about 50μm in size, so that in step S3, the bump 201 can form a gap 120 with a relatively uniform thickness at each location between the first glue layer 101 and the first surface of the second hard screen body 2.

[0033] In this embodiment, the thickness of the second adhesive layer 202 is 80% of that of the first adhesive layer 101, and the height of the powder 21 is 50% of the sum of the thicknesses of the first adhesive layer 101 and the second adhesive layer 202. This can ensure that in step S5, the powder 21 can be pressed into both the first adhesive layer 101 and the second adhesive layer 202 simultaneously, with less deformation of the adhesive layer, reduced stress of the adhesive layer, and improved bonding stability.

[0034] In addition, it should be noted that for the specific embodiments described in this specification, the names of their respective parts and the like can be different. Any equivalent or simple changes made according to the structure, features, and principles of this invention are included in the protection scope of this invention. Those skilled in the art to which this invention pertains can make various modifications, supplements, or use similar methods to replace the specific embodiments described, as long as they do not deviate from the structure of this invention or exceed the scope defined by this claim book, they should fall within the protection scope of this invention.

Claims

1. A full lamination method for a hard screen assembly, characterized in that The method includes the following steps: S1. Provide a first rigid screen body, and provide a first adhesive layer on the first surface of the first rigid screen body; S2. Provide a second rigid screen body, and provide a plurality of bumps on the first surface of the second rigid screen body; S3. Perform a pre-bonding operation, set the first surface of the second rigid screen body opposite to and close to the first surface of the first rigid screen body, so that each bump on the second rigid screen body forms a temporary bond with the first adhesive layer on the first rigid screen body, to temporarily fix and determine the alignment relationship between the first rigid screen body and the second rigid screen body, and each bump forms a gap between the first adhesive layer and the first surface of the second rigid screen body, thus obtaining a pre-bonding assembly; S4. Transfer the pre-bonding assembly to a closed cavity and evacuate the closed cavity to completely remove the residual gas in the gap, so that the pre-bonding assembly is in a vacuum environment; S5. Perform a pressing operation on the pre-bonding assembly in the vacuum environment, apply a directional pressure to the first rigid screen body or the second rigid screen body, so that the second rigid screen body undergoes a relative displacement toward the first rigid screen body, and the bumps on the second rigid screen body are pressed into the first adhesive layer on the first rigid screen body until the gap is completely eliminated, realizing bubble-free full bonding between the first rigid screen body and the second rigid screen body, and obtaining the rigid screen body assembly.

2. The full lamination method of a hard screen assembly according to claim 1, characterized in that: The first adhesive layer is a paste or semi-solid transparent adhesive layer, and the viscosity coefficient of the first adhesive layer is not less than 15000 centipoise (cP).

3. A full lamination method for a hard screen assembly according to claim 1, characterized in that: The bumps are provided on the first surface of the first rigid screen body by printing or patterning, and the top of the bumps is non-planar.

4. A full lamination method for a hard screen assembly according to claim 1, characterized in that: In step S2, first provide a second adhesive layer on the first surface of the second rigid screen body, and then sprinkle powder on the surface of the second adhesive layer, and the powder adheres to the second adhesive layer to form the bumps.

5. A full lamination method for a rigid screen assembly according to claim 4, characterized in that: The powder is silica beads, glass powder or plastic powder.

6. A full lamination method for a hard screen assembly according to claim 4, characterized in that: The height of the powder does not exceed the total thickness of the first adhesive layer and the second adhesive layer.

7. A full lamination method for a hard screen assembly according to claim 6, characterized in that: The height of the powder is 30% - 70% of the total thickness of the first adhesive layer and the second adhesive layer.

8. A full lamination method for a rigid screen assembly according to claim 4, characterized in that: The thickness of the second adhesive layer is 80% - 120% of the thickness of the first adhesive layer.

9. A full lamination method for a hard screen assembly according to claim 1, characterized in that: In step S1, the number of the first rigid screen bodies provided is at least two; in step S3, set the first surfaces of the first rigid screen bodies opposite to the first surface of the second rigid screen body, and make the first adhesive layers on the first rigid screen bodies form temporary bonds with the bumps on the second rigid screen body to fix the alignment relationship between the first rigid screen bodies and the second rigid screen body; in step S5, apply a directional pressure to each first rigid screen body, so that each first rigid screen body undergoes a relative displacement toward the second rigid screen body, and the bumps on the second rigid screen body are pressed into the first adhesive layers on the first rigid screen bodies until the gap is completely eliminated, realizing bubble-free full bonding between each first rigid screen body and the second rigid screen body, and obtaining the rigid screen body assembly.

10. A full lamination method for a hard screen assembly according to claim 1, characterized in that: Before performing the step S4, the steps S1-S3 are repeated to prepare a plurality of the pre-laminated components; in the step S4, the plurality of the pre-laminated components are moved into the same closed cavity together and the closed cavity is evacuated to completely remove the gas remaining in the gaps on the plurality of the pre-laminated components; in the step S5, a pressing operation is performed on the plurality of the pre-laminated components simultaneously to obtain a plurality of the rigid screen components.

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