Segmented Flexible Display Bonding for Bubble-Free 3D Cover Windows
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Solution Overview
Problem
The bonding between flexible display panels and cover windows in flexible display apparatuses with 3D shapes is uneven, leading to bubble formation and defects such as cracks, which deteriorate the quality and productivity of the display apparatus.
Innovation Solution
A manufacturing apparatus and structure that uniformly bonds a flexible display panel to a cover window with a 3D shape by using a 3D attachment portion with a 3D pressurizing pad to press the edge adhesive surfaces of the display panel onto the curvature portions of the cover window, avoiding direct pressure on the central adhesive surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional bonding process is used to attach the flexible display panel to the cover window with a 3D shape, then the bonding process is simple, but the bonding becomes uneven and bubbles are generated
Solution Approach 1:
The attachment apparatus is divided into multiple independent attachment portions (first attachment portion for flat portion, second attachment portion for first curvature portion, third attachment portion for second curvature portion). Each portion independently presses the display panel onto the corresponding region of the cover window, ensuring uniform bonding across different surface geometries without generating bubbles.
Solution Approach 2:
Each attachment portion is designed with specific pressing characteristics suited for its target region. The first attachment portion presses the flat portion, while the second and third attachment portions are configured to press the curved portions at appropriate angles and pressures, providing locally optimized bonding conditions for each region of the cover window.
2Manufacturing precision
If uniform bonding is achieved through multiple attachment portions, then bonding quality improves, but the attachment process becomes more complex
Solution Approach 1:
The attachment process is segmented into distinct stages corresponding to different regions of the cover window. The first attachment portion handles the flat portion, while the second and third attachment portions handle the curved portions. This segmentation allows each portion to be optimized for its specific function while maintaining overall process integration.
Solution Approach 2:
The first attachment portion performs preliminary bonding on the flat portion of the cover window before the second and third attachment portions bond the curved portions. This preliminary action stabilizes the display panel in position and facilitates subsequent bonding operations on the curved regions.
3Productivity
If bubbles are generated during bonding, then productivity deteriorates, but using a complex attachment apparatus increases manufacturing complexity
Solution Approach 1:
By dividing the attachment apparatus into multiple specialized portions, each optimized for specific regions of the cover window, the system achieves comprehensive bubble prevention across all surfaces. The first attachment portion prevents bubbles on the flat portion, while the second and third attachment portions prevent bubbles on the curved portions through their specialized pressing configurations.
Solution Approach 2:
Each attachment portion provides locally adapted pressing force and angle optimized for its target region. The second and third attachment portions are specifically configured to press the curved portions at angles that prevent bubble formation, while the first attachment portion provides uniform pressing on the flat portion, collectively eliminating bubbles across the entire bonding surface.
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 ensures uniform bonding without bubbles, improving the quality and productivity of the flexible display apparatus by preventing cracks and enhancing the aesthetic appeal with reduced bezel areas.
Implementation Method 1
a 3D attachment portion configured to press a first edge adhesive surface and a second edge adhesive surface of the display panel to the first curvature portion and the second curvature portion of the cover window
Data Source
AI summary
A manufacturing apparatus is configured to bond a display panel to a cover window having a flat portion between a first curvature portion and a second curvature portion. The manufacturing apparatus comprises a first attachment portion configured to press a first adhesive surface of the display panel to the flat portion of the cover window, and a 3D attachment portion configured to press a first edge adhesive surface and a second edge adhesive surface of the display panel to the first curvature portion and the second curvature portion of the window, respectively, and not press the first adhesive surface of the display panel.