Display Module Lamination Using Vacuum Negative Pressure Sealing
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Solution Overview
Problem
Current laminating methods for display modules, such as frame lamination and full lamination, face issues with light transmittance loss, touch sensitivity, and high production costs due to uneven adhesive thickness and overflow, leading to reduced user experience and efficiency.
Innovation Solution
A laminating method involving a sealing frame adhesive is applied around the perimeter of the display module, creating a negative pressure state between the panels to ensure uniform bonding and prevent adhesive overflow, using a specific adhesive coating and curing process to control the adhesive's viscosity and hardness, and incorporating a vacuumizing step to seal the gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If frame lamination with foam is used, then the structure is simple and easy to manufacture, but light transmittance decreases and display quality deteriorates due to air gaps
Solution Approach 1:
The invention extracts and removes the air gap from the lamination structure by applying vacuum negative pressure during bonding. This eliminates the harmful air layer that causes light reflection and reduces transmittance, while maintaining the simplicity of frame lamination without requiring full-surface optical glue application.
Solution Approach 2:
The invention changes the pressure parameter from atmospheric pressure to negative pressure (vacuum) during the lamination process. This parameter change allows the air gap to be evacuated and eliminated, improving light transmittance without changing the fundamental frame lamination approach.
2Strength
If frame adhesive is used instead of foam, then bonding strength is improved, but adhesive thickness cannot be controlled uniformly causing touch sensitivity issues
Solution Approach 1:
The invention uses vacuum pneumatic pressure to control the adhesive bonding process. The negative pressure ensures uniform adhesive distribution and thickness without requiring manual control or complex positioning mechanisms, achieving both strong bonding and precise thickness control.
Solution Approach 2:
The vacuum negative pressure system provides automatic feedback control during the lamination process. The pressure differential automatically adjusts adhesive flow and distribution, ensuring uniform thickness without requiring external monitoring or manual intervention.
3Strength
If bonding adhesive is pressed during lamination, then bonding strength increases, but adhesive overflows and enters display area causing defects
Solution Approach 1:
The invention applies vacuum negative pressure beforehand and during the adhesive bonding process to prevent overflow. The negative pressure creates a cushioning effect that contains the adhesive within the intended bonding zone, preventing it from entering the display area while still achieving strong bonding.
4Illumination intensity
If full lamination with liquid optical glue is used, then light transmittance is improved, but production cost increases and manual glue removal is required
Solution Approach 1:
The invention extracts and eliminates the air gap using vacuum negative pressure, achieving the optical benefits of full lamination without requiring actual full-surface glue application. This maintains high light transmittance while avoiding the cost and productivity issues of traditional full lamination.
Solution Approach 2:
The invention uses a simple vacuum sealing structure (cling film) that is inexpensive and disposable, replacing the need for expensive optical glue and complex full lamination processes while achieving similar or better optical performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method improves light transmittance, touch sensitivity, and user experience by maintaining a uniform adhesive thickness, reducing production costs, and eliminating the need for manual adhesive removal, while ensuring reliable bonding and adaptability to narrow bezels.
Implementation Method 1
a gap defined by the sealing frame adhesive, the first panel and the second panel is in a negative pressure state
Implementation Method 2
coating a bonding adhesive on a side surface of the second panel along an outer circumference of the second panel and curing the bonding adhesive to form a sealing frame adhesive
Data Source
AI summary
The present disclosure relates to a laminating method and device for a display module, a display module and an electronic device. The laminating method includes steps of: laminating a second panel on a first surface of a first panel, and positioning the second panel relative to the first panel; and coating a bonding adhesive on a side surface of the second panel along an outer circumference of the second panel and curing the bonding adhesive to form a sealing frame adhesive on an outer circumference side of the second panel and the first surface of the first panel, so that the first panel and the second panel are bonded and fixed by the sealing frame adhesive, wherein a gap defined by the sealing frame adhesive, the first panel and the second panel is in a negative pressure state.