Display screen assembly method and display screen assembly device

Abstract

The application relates to the technical field of display screen assembling, and discloses a display screen assembling method and a display screen assembling device. The display screen assembling method comprises the following steps: cleaning a cover plate; heating the cover plate; coating OCA optical glue on the cover plate, and heating the cover plate and the OCA optical glue to remove the soluble gas in the OCA optical glue; attaching a display module to the side of the OCA optical glue far from the cover plate; and coating a film. The application heats the cleaned cover plate to discharge the soluble gas in the cover plate, and then heats the cover plate and the OCA optical glue again after coating the OCA optical glue on the cover plate to remove the soluble gas in the OCA optical glue, so that the above-mentioned heating steps can effectively avoid the generation of air bubbles in the subsequent high-temperature and high-pressure film coating process. The display screen assembling method can effectively reduce the generation of air bubbles in the film coating process, and further ensures the display effect of the assembled display screen.

Description

Technical Field

[0001] This invention relates to the field of display screen assembly technology, and more particularly to a display screen assembly method and display screen assembly apparatus. Background Technology

[0002] During the assembly process, OCA (Optically Clear Adhesive) or OCR (Optical Clear Resin) solid optical adhesives are used to bond the display module and cover plate before assembly and shipment. Some products undergo vacuum high-temperature coating after assembly (such as coating after cutting flexible substrates) to achieve better water and oxygen barrier or display effect.

[0003] However, in the existing technology, since the OCA adhesive has already cured after the cover plate and the display module are bonded together, the internal gas cannot escape during the subsequent high vacuum and high temperature coating process. This causes OCA bubbles to appear in products that were originally bonded without bubbles at room temperature, resulting in a significant reduction in their display effect.

[0004] Therefore, there is an urgent need for a display screen assembly method and display screen assembly device to solve the above problems. Summary of the Invention

[0005] Based on the above, the purpose of this invention is to provide a display screen assembly method and display screen assembly device, which can effectively reduce the generation of air bubbles and ensure the display effect of the assembled display screen.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The display screen assembly method includes the following steps:

[0008] Clean the cover plate;

[0009] Heating the cover plate;

[0010] OCA optical adhesive is applied to the cover plate, and the cover plate and the OCA optical adhesive are heated to remove the gas inside the OCA optical adhesive;

[0011] The display module will be attached to the side of the OCA optical adhesive away from the cover plate;

[0012] Coating.

[0013] As a preferred embodiment of the display assembly method, cleaning the cover plate includes wiping the cover plate and cleaning the cover plate with plasma.

[0014] As a preferred embodiment of the display assembly method, wiping the cover plate includes: wiping the cover plate with acetone; and then wiping the cover plate with alcohol.

[0015] As a preferred embodiment of the display assembly method, after plasma cleaning of the cover plate, the method further includes: detecting the cleanliness of the cover plate.

[0016] As a preferred embodiment of the display assembly method, detecting the cleanliness of the cover plate includes: using a water droplet angle device to detect whether the water droplet angle is less than a preset value, wherein the preset value is 14°-16°.

[0017] As a preferred embodiment of the display assembly method, the temperature of the cover plate is heated to be 10°-15° higher than the coating temperature; and / or, the temperature of the cover plate and the OCA optical adhesive is heated to be 10°-15° higher than the coating temperature.

[0018] As a preferred embodiment of the display assembly method, after attaching the display module to the side of the OCA optical adhesive away from the cover plate, the method further includes: rolling the display module and the cover plate in a vacuum chamber at a preset temperature and preset pressure.

[0019] As a preferred embodiment of the display assembly method, after rolling the display module and the cover plate, the method further includes: curing the OCA optical adhesive.

[0020] As a preferred embodiment of the display assembly method, after rolling the display module and the cover plate, and / or after curing the OCA optical adhesive, the method further includes inspection.

[0021] The display assembly apparatus adopts the display assembly method as described in any of the above schemes. The display assembly apparatus includes an assembly platform for adsorbing and heating the cover plate. The assembly platform is also provided with an attachment component and a vacuum rolling component.

[0022] The beneficial effects of this invention are as follows:

[0023] This invention cleans the cover plate to remove impurities that could affect subsequent OCA optical adhesive coating and display module attachment. Heating the cleaned cover plate removes soluble gases, preventing them from forming bubbles during the high-temperature, high-pressure coating process. After applying OCA optical adhesive to the cover plate, heating both the cover plate and the adhesive again removes soluble gases from the adhesive, again preventing bubble formation during the high-temperature, high-pressure coating process. Finally, the display module is attached to the side of the OCA optical adhesive away from the cover plate and coated, completing the display assembly. This display assembly method effectively reduces bubble formation during the coating process, thus ensuring the display effect of the assembled screen. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0025] Figure 1 This is a flowchart of a display screen assembly method provided in a specific embodiment of the present invention. Detailed Implementation

[0026] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0028] Unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0029] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0030] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 As shown, this embodiment provides a display screen assembly method, which includes the following steps: cleaning the cover plate; heating the cover plate; coating the cover plate with OCA optical adhesive and heating the cover plate and OCA optical adhesive to remove gas inside the OCA optical adhesive; attaching the display module to the side of the OCA optical adhesive away from the cover plate; and coating.

[0032] The cover plate is cleaned to remove impurities that could affect the subsequent application of OCA optical adhesive and attachment of the display module. Heating the cleaned cover plate removes soluble gases, preventing them from forming bubbles during the high-temperature, high-pressure coating process. After applying OCA optical adhesive to the cover plate, both the cover plate and the adhesive are heated again to remove soluble gases from the adhesive, again preventing bubble formation during the high-temperature, high-pressure coating process. Finally, the display module is attached to the side of the OCA optical adhesive away from the cover plate and coated, completing the display assembly. This display assembly method effectively reduces bubble formation during the coating process, thus ensuring the display quality of the assembled screen.

[0033] Specifically, the cleaning cover plate includes a wiping cover plate and a plasma-cleaned cover plate. The wiping cover plate is used to remove large particles of foreign matter residue from the cover plate, preventing the formation of nucleated bubbles from large particles of foreign matter residue during the high-temperature and high-pressure coating process.

[0034] In this embodiment, wiping the cover plate includes: first wiping the cover plate with acetone; then wiping the cover plate with alcohol. Wiping with acetone is more effective, and wiping with alcohol after acetone helps accelerate the evaporation of acetone, reducing the impact of residual acetone on subsequent assembly processes. Optionally, the cover plate can be wiped with a lint-free cloth soaked in acetone or alcohol.

[0035] As an alternative method for display assembly, plasma cleaning of the cover plate can be performed with a power of 100W-200W and a cleaning time of 10s-15s. Specifically, those skilled in the art can make appropriate adjustments based on the size and cleanliness of the cover plate. The purpose of plasma cleaning is to remove soluble organic matter from the cover plate, preventing its volatilization during the high-temperature and high-pressure coating process and improving the adhesion of the cover plate when coated with OCA optical adhesive.

[0036] Preferably, after plasma cleaning of the cover plate, the method further includes: detecting the cleanliness of the cover plate. Detecting the cleanliness of the cover plate after cleaning is used to assess the cleaning effect, thereby ensuring that the cover plate entering the subsequent assembly process meets a certain level of cleanliness.

[0037] Specifically, the cleanliness of the cover plate is checked by using a water droplet angle measuring device to check whether the water droplet angle is less than a preset value, which is 14°-16°. For example, the cover plate is considered clean when the water droplet angle is less than 15°.

[0038] In this embodiment, the temperature of the heating cover plate is 10°-15° higher than the coating temperature; and / or, the temperature of the heating cover plate and the OCA optical adhesive is 10°-15° higher than the coating temperature. Optionally, when the coating temperature is 50°, the corresponding temperature of the heating cover plate and the temperature of the heating cover plate and the OCA optical adhesive can be set to 65°.

[0039] Furthermore, the heating time of the cover plate and the heating time of the cover plate and the OCA optical adhesive can be set by those skilled in the art according to actual needs. For example, it can be set to about 10 minutes.

[0040] As an alternative method for assembling the display screen, after attaching the display module to the side of the OCA optical adhesive away from the cover plate, the assembly further includes: rolling the display module and the cover plate in a vacuum chamber at a preset temperature and pressure. By rolling the display module at the preset temperature and pressure, the adhesion between the display module and the cover plate can be ensured, and the high-temperature and high-pressure environment can effectively reduce the reintroduction of new gas, thereby reducing the generation of air bubbles. Optionally, the rolling at the preset temperature and pressure can be sustained for 5-30 minutes.

[0041] Specifically, after rolling the display module and cover plate, the process also includes curing OCA optical adhesive. The OCA optical adhesive can be cured using a UV curing lamp, and the curing time can be set according to actual needs; no specific limitation is made here.

[0042] Furthermore, the process includes inspection after roll forming the display module and cover plate, and / or after curing the OCA optical adhesive. The inspection after roll forming the display module and cover plate can be used to check the roll forming effect, and the inspection after curing the OCA optical adhesive can be used to check the curing effect, both of which help ensure the yield rate of the assembled display screen.

[0043] This embodiment also discloses a display screen assembly apparatus, employing the display screen assembly method described in any of the above schemes. The display screen assembly apparatus includes an assembly platform for adsorbing and heating a cover plate. The assembly platform is also equipped with an attachment component and a vacuum rolling component. Specifically, the plasma cleaning of the cover plate, detection of the cover plate's cleanliness, heating of the cover plate, coating of the cover plate with OCA optical adhesive, heating of the cover plate and the OCA optical adhesive, and attachment of the display module to the side of the OCA optical adhesive away from the cover plate are all performed on the assembly platform. It is understood that the assembly platform can stably adsorb and heat the cover plate, and is also equipped with corresponding attachment components and a vacuum rolling component for attaching the OCA optical adhesive and the display module, and a high-temperature, high-pressure environment for rolling the display module and the cover plate. The display screen assembled by the above-described display screen assembly apparatus has fewer bubbles, resulting in better display effects and higher integration.

[0044] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A display screen assembly method, characterized in that, Includes the following steps: Clean the cover plate; The cover plate is heated to expel soluble gases from inside the cover plate; OCA optical adhesive is applied to the cover plate, and the cover plate and the OCA optical adhesive are heated to remove the gas inside the OCA optical adhesive; The display module will be attached to the side of the OCA optical adhesive away from the cover plate; Coating; The temperature of the cover plate is heated to be 10°-15° higher than the coating temperature; and / or the temperature of the cover plate and the OCA optical adhesive is heated to be 10°-15° higher than the coating temperature; After attaching the display module to the side of the OCA optical adhesive away from the cover plate, the process further includes: rolling the display module and the cover plate in a vacuum chamber at a preset temperature and preset pressure.

2. The display screen assembly method according to claim 1, characterized in that, Cleaning the cover plate includes wiping the cover plate and cleaning the cover plate with plasma.

3. The display screen assembly method according to claim 2, characterized in that, Wiping the cover plate includes: wiping the cover plate with acetone; and then wiping the cover plate with alcohol.

4. The display screen assembly method according to claim 2, characterized in that, The plasma cleaning process also includes: detecting the cleanliness of the cover plate.

5. The display screen assembly method according to claim 4, characterized in that, The cleanliness of the cover plate is tested by using a water droplet angle device to check whether the water droplet angle is less than a preset value, which is 14°-16°.

6. The display screen assembly method according to claim 1, characterized in that, After rolling the display module and the cover plate, the process further includes curing the OCA optical adhesive.

7. The display screen assembly method according to claim 6, characterized in that, After rolling the display module and the cover plate, and / or after curing the OCA optical adhesive, the process also includes inspection.

8. A display screen assembly device, characterized in that, The display assembly method according to any one of claims 1-7 is used, wherein the display assembly apparatus includes an assembly platform for adsorbing and heating the cover plate, and the assembly platform is further provided with an attachment component and a vacuum rolling component.

Images