Display module and preparation method thereof

Abstract

The application discloses a display module and a preparation method thereof. The preparation method of the display module comprises the following steps: providing a transparent glass and a cover plate, wherein the cover plate is injection molded; providing OCR liquid glue, and applying the OCR liquid glue on the surface of one side of the transparent glass; bonding the cover plate and the surface of one side of the transparent glass coated with the OCR liquid glue; curing the OCR liquid glue; providing a display module, and bonding the display module and the surface of one side of the transparent glass away from the surface coated with the OCR liquid glue by using OCA solid glue. Thus, the problems of more air bubbles caused by directly bonding the cover plate and the display module by using OCA or the problem of OCR bleeding caused by directly bonding the cover plate and the display module by using OCR are avoided.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically to a display module and its manufacturing method. Background Technology

[0002] With the increasing diversification of display applications, injection-molded cover plates are becoming more and more widely used. Injection-molded cover plates have the advantages of low cost and the ability to be designed into various irregular shapes. However, a disadvantage is that injection shrinkage and deformation lead to poor flatness of the bonding surface, which in turn causes air bubble rebound after direct full lamination with OCA (Optically Clear Adhesive). If OCR (Optical Clear Resin) is used for direct lamination, the light-shielding problem of the cover plate, display module, and FPC (Flexible Printed Circuit) may prevent the liquid OCR from curing, resulting in OCR seepage, which affects product performance and appearance. Summary of the Invention

[0003] The technical problem to be solved by this invention is that when OCA is used to directly bond the cover plate and the display module, there are many air bubbles, or when OCR is used to directly bond the cover plate and the display module, there is OCR leakage.

[0004] This invention provides a method for manufacturing a display module, comprising the following steps: providing transparent glass and a cover plate, wherein the cover plate is injection molded; providing OCR liquid adhesive and applying the OCR liquid adhesive to one side of the transparent glass; bonding the cover plate to the side of the transparent glass coated with the OCR liquid adhesive; curing the OCR liquid adhesive; and providing a display module by using OCA solid adhesive to bond the display module to the side of the transparent glass away from the OCR liquid adhesive.

[0005] Optionally, it also includes: after the OCR liquid adhesive has cured, before bonding the display module to the surface of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive, performing a first degassing treatment between the cover plate and the transparent glass that are bonded together.

[0006] Optionally, the step of bonding the display module to the surface of the transparent glass away from the side coated with OCR liquid adhesive using OCA solid adhesive includes: adhering OCA solid adhesive to the display surface of the display module, and bonding the surface of the display module away from the side coated with OCR liquid adhesive to the display surface of the display module.

[0007] Optionally, the step of bonding the display module and the transparent glass away from the surface coated with OCR liquid adhesive using OCA solid adhesive includes: adhering OCA solid adhesive to the surface of the display module and the transparent glass away from the surface coated with OCR liquid adhesive, and bonding the side of the transparent glass with the OCA solid adhesive adhered to it to the display surface of the display module.

[0008] Optionally, after bonding the display module to the surface of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive, a second degassing treatment is performed between the bonded transparent glass and the display module.

[0009] Optionally, in the OCR liquid adhesive curing step, the OCR liquid adhesive is cured by ultraviolet curing, hot pressing curing, or room temperature curing.

[0010] The present invention also provides a method for manufacturing a display module, comprising the following steps: providing a display module and a transparent glass, and using OCA solid adhesive to bond the display module to one side of the transparent glass; providing OCR liquid adhesive and a cover plate, wherein the cover plate is injection molded; applying OCR liquid adhesive to the surface of the transparent glass away from the OCA solid adhesive; bonding the cover plate to the surface of the transparent glass coated with OCR liquid adhesive; and curing the OCR liquid adhesive.

[0011] The present invention also provides a display module, comprising a cover plate, an OCR film, a transparent glass, an OCA film and a display module stacked from top to bottom, wherein the cover plate is injection molded.

[0012] Optionally, the thickness of the OCR film is 0.15mm-0.35mm.

[0013] Optionally, the thickness of the transparent glass is 0.4mm-1.5mm.

[0014] The above-described technical solution of the present invention has the following beneficial effects:

[0015] The method for manufacturing a display module provided by this invention includes the following steps: providing transparent glass and a cover plate, wherein the cover plate is injection molded; providing OCR liquid adhesive and applying the OCR liquid adhesive to one side of the transparent glass; bonding the cover plate to the surface of the transparent glass coated with the OCR liquid adhesive; curing the OCR liquid adhesive; and providing a display module by using OCA solid adhesive to bond the display module to the surface of the transparent glass away from the OCR liquid adhesive. The OCR liquid adhesive effectively fills the uneven areas between the injection-molded cover plate and the transparent glass, and the transparent glass provides a flat surface for bonding the display module to the transparent glass with the OCA solid adhesive without obscuring or affecting the curing of the OCR liquid adhesive. This avoids the problems of excessive air bubbles when directly bonding the cover plate and display module with OCA or OCR leakage when directly bonding the cover plate and display module with OCR. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the exploded structure of the module shown in the embodiment of this application.

[0018] Figure label:

[0019] 1. Cover plate; 2. OCR film; 3. Transparent glass; 4. OCA film; 5. Display module. Detailed Implementation

[0020] The technical solutions of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] Example 1

[0022] This embodiment provides a method for manufacturing a display module, including the following steps: providing transparent glass and a cover plate, wherein the cover plate is injection molded; providing OCR liquid adhesive and applying the OCR liquid adhesive to one side of the transparent glass; bonding the cover plate to the side of the transparent glass coated with the OCR liquid adhesive; curing the OCR liquid adhesive; providing a display module and bonding the display module to the side of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive. The display module manufacturing method provided in this embodiment effectively fills the uneven areas between the injection-molded cover plate bonding surface and the transparent glass using OCR liquid adhesive. The transparent glass provides a flat surface for bonding the display module to the transparent glass with OCA solid adhesive, without obstructing or affecting the curing of the OCR liquid adhesive. This avoids the problems of numerous air bubbles that occur when directly bonding the cover plate and display module with OCA solid adhesive (or simply using OCA solid adhesive), or OCR leakage that occurs when directly bonding the cover plate and display module with OCR liquid adhesive (or simply using OCR liquid adhesive). Using the display module manufacturing method of this embodiment, compared to directly bonding the cover plate and display module with OCA solid adhesive, the defect rate due to air bubbles is reduced from 50% to less than 2%, and there is no air bubble rebound phenomenon or OCR liquid adhesive leakage.

[0023] The manufacturing method of the display module in this embodiment further includes: after the OCR liquid adhesive has cured, and before bonding the display module to the surface of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive, performing a first degassing treatment on the cover plate and the transparent glass that are bonded together. The first degassing treatment can be performed by hot pressing to eliminate air bubbles formed between the cover plate and the transparent glass due to the shrinkage of the OCR liquid adhesive during curing, thereby reducing the defect rate of air bubbles between the cover plate and the transparent glass.

[0024] The method for fabricating the display module in this embodiment utilizes OCA solid adhesive to bond the display module to the surface of the transparent glass away from the side coated with OCR liquid adhesive. OCA solid adhesive offers advantages such as reducing glare, minimizing light loss from the display module, increasing contrast, reducing energy consumption, avoiding Newton's rings, and creating a borderless or expanded viewing area. The OCA solid adhesive can be applied first to the display surface of the display module and then bonded to the transparent glass; alternatively, it can be applied first to the surface of the transparent glass and then bonded to the display surface of the display module. Neither method affects the effectiveness of the OCA solid adhesive.

[0025] In one embodiment, the step of bonding the display module to the surface of the transparent glass away from the side coated with OCR liquid adhesive using OCA solid adhesive includes: adhering OCA solid adhesive to the display surface of the display module, and bonding the surface of the display module away from the side coated with OCR liquid adhesive to the display surface of the display module.

[0026] In another embodiment, the step of bonding the display module and the transparent glass away from the surface coated with OCR liquid adhesive using OCA solid adhesive includes: adhering OCA solid adhesive to the surface of the display module and the transparent glass away from the surface coated with OCR liquid adhesive, and bonding the side of the transparent glass with the OCA solid adhesive adhered to it to the display surface of the display module.

[0027] The method for manufacturing the display module in this embodiment involves bonding the display module to the surface of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive, followed by a second degassing process between the bonded transparent glass and the display module. This second degassing process can be achieved through hot pressing to eliminate air bubbles located between the cover plate and the transparent glass, thereby reducing the defect rate of the final formed display module with air bubbles.

[0028] In the manufacturing method of the display module in this embodiment, the OCR liquid adhesive is cured by ultraviolet light in the curing step. Ultraviolet curing can improve the production rate and allows sufficient time for precise positioning of the cover plate and transparent glass before curing.

[0029] In another embodiment, the OCR liquid adhesive curing step is performed by hot-press curing. Hot-press curing is simple to operate and can simultaneously expel air bubbles between the cover plate and the transparent glass during the OCR liquid adhesive curing process.

[0030] In another embodiment, the OCR liquid adhesive is cured at room temperature during the curing step. Room temperature curing results in lower shrinkage and better resistance to high temperature and humidity as well as thermal shock.

[0031] Example 2

[0032] This embodiment provides a method for manufacturing a display module, including the following steps: providing a display module and transparent glass; using OCA solid adhesive to bond the display module to one side of the transparent glass; providing OCR liquid adhesive and a cover plate, the cover plate being injection molded; applying OCR liquid adhesive to the surface of the transparent glass away from the OCA solid adhesive; bonding the cover plate to the surface of the transparent glass coated with OCR liquid adhesive; and curing the OCR liquid adhesive. The OCR liquid adhesive effectively fills the uneven areas between the injection-molded cover plate and the transparent glass, providing a flat surface for bonding the display module and the transparent glass with the OCA solid adhesive without obstructing or affecting the curing of the OCR liquid adhesive. This avoids the problems of excessive air bubbles when bonding the cover plate and display module with OCA solid adhesive or OCR leakage when bonding the cover plate and display module with OCR liquid adhesive.

[0033] Example 3

[0034] This embodiment provides a display module, such as Figure 1 As shown, the display module includes, from top to bottom, a cover plate 1, an OCR film 2, a transparent glass 3, an OCA film 4, and a display module 5, all stacked sequentially. The cover plate 1 is injection molded. Injection-molded cover plates 1 have the advantages of low cost and the ability to be designed into various irregular shapes; however, their disadvantage is that injection molding shrinkage and deformation lead to poor flatness of the bonding surface, resulting in numerous air bubbles after bonding the cover plate and display module with OCA solid adhesive. If OCR liquid adhesive is used to bond the cover plate and display module, the OCR liquid adhesive may not cure due to light-blocking issues caused by the cover plate, display module, or flexible circuit board, resulting in OCR liquid adhesive seepage, affecting product performance and appearance. The display module provided in this embodiment effectively fills the uneven areas between the bonding surface of the injection-molded cover plate 1 and the transparent glass 3 using the OCR film 2. The transparent glass 3 provides a flat surface for bonding the display module 5 to the transparent glass 3 using the OCA film 4, thus reducing the defect rate of air bubbles in the display module and preventing OCR seepage.

[0035] In one embodiment, the thickness of the OCR film 2 is 0.15mm-0.35mm, for example: 0.15mm, 0.2mm, 0.25mm, 0.3mm or 0.35mm. If the thickness of the OCR film 2 is less than 0.15mm, the adhesive force of the OCR film 2 is weakened, which will cause the cover plate 1 and the transparent glass 3 to be poorly bonded; if the thickness of the OCR film 2 is greater than 0.35mm, the probability of air bubbles appearing between the cover plate 1 and the transparent glass 3 during the formation of the OCR film 2 increases, thereby making the subsequent debubbling process more difficult.

[0036] In one embodiment, the thickness of the transparent glass 3 is 0.4mm-1.5mm, for example: 0.4mm, 0.6mm, 0.8mm, 1mm or 1.5mm. If the thickness of the transparent glass 3 is less than 0.4mm, the transparent glass is prone to deformation, which affects the adhesion of the OCR film or OCA film and increases the defect rate of the finished display module. If the thickness of the transparent glass 3 is greater than 1.5mm, it will increase the thickness of the display module, thereby reducing the application range of the display module.

[0037] The display module in this embodiment can be applied to mobile phones, electronic bracelets, or smart home appliances.

[0038] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A method for manufacturing a display module, characterized in that, Includes the following steps: A transparent glass and a cover plate are provided, the cover plate being injection molded; Provide OCR liquid adhesive and apply the OCR liquid adhesive to the surface of one side of the transparent glass; The cover plate is attached to the surface of the transparent glass coated with OCR liquid adhesive. OCR liquid adhesive curing; A display module is provided, and the display module is bonded to the surface of the transparent glass away from the side coated with OCR liquid adhesive using OCA solid adhesive.

2. The method for preparing a display module according to claim 1, characterized in that, Also includes: After the OCR liquid adhesive has cured, before bonding the display module to the surface of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive, a first degassing treatment is performed between the cover plate and the transparent glass that are bonded together.

3. The method for preparing a display module according to claim 1, characterized in that, The step of bonding the display module to the surface of the transparent glass away from the side coated with OCR liquid adhesive using OCA solid adhesive includes: adhering OCA solid adhesive to the display surface of the display module, and bonding the surface of the display module away from the side coated with OCR liquid adhesive to the display surface of the display module.

4. The method for preparing a display module according to claim 1, characterized in that, The step of bonding the display module and the transparent glass away from the surface coated with OCR liquid adhesive using OCA solid adhesive includes: adhering OCA solid adhesive to the surface of the display module and the transparent glass away from the surface coated with OCR liquid adhesive, and bonding the side of the transparent glass with the OCA solid adhesive adhered to it to the display surface of the display module.

5. The method for preparing a display module according to any one of claims 1-4, characterized in that, After bonding the display module to the surface of the transparent glass away from the OCR liquid adhesive using OCA solid adhesive, a second degassing process is performed between the bonded transparent glass and the display module.

6. The method for manufacturing a display module according to any one of claims 1-4, characterized in that, In the OCR liquid adhesive curing step, the OCR liquid adhesive is cured by ultraviolet light curing, hot pressing curing, or room temperature curing.

7. A method for manufacturing a display module, characterized in that, Includes the following steps: A display module and a transparent glass are provided, and the display module is bonded to one side of the transparent glass using OCA solid adhesive; Provides an OCR liquid adhesive and a cover plate, wherein the cover plate is injection molded; Apply OCR liquid adhesive to the surface of the transparent glass away from the OCA solid adhesive; The cover plate is attached to the surface of the transparent glass coated with OCR liquid adhesive. OCR liquid adhesive curing.

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