Line Contact Attachment for Flexible Display Cover Windows
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Solution Overview
Problem
Existing methods for manufacturing flexible display devices face challenges in reliably attaching adhesive films, touch panels, and flexible display panels to three-dimensional cover windows, often resulting in adhesion issues such as bubbles and reduced reliability due to atmospheric pressure rolling or vacuum surface compression methods.
Innovation Solution
A method and apparatus that utilize a line contact attachment process with a support and line contact body, including an attachment head and attachment rolls, to securely attach adhesive films, touch panels, and flexible display panels to the inner surface of a three-dimensional cover window in an atmospheric pressure environment, preventing lifting phenomena and enhancing adhesion reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If atmospheric pressure rolling or vacuum surface compression methods are used to attach panels to the cover window, then the attachment process can be simplified, but adhesion reliability deteriorates due to bubble formation and lifting phenomena
Solution Approach 1:
The attachment process is segmented into multiple sequential line contact operations instead of a single surface compression operation. The attachment head moves along the inner surface of the cover window, attaching panels line by line from one end to the other, which prevents bubble formation while maintaining process simplicity
Solution Approach 2:
The support structure is configured with a predetermined curved shape that matches the outer surface of the cover window before the attachment process begins. This preliminary shaping ensures that when panels are attached via line contact, they conform to the three-dimensional surface without creating bubbles or lifting, thereby improving adhesion reliability from the outset
2Manufacturing precision
If vacuum surface compression is used to ensure complete contact, then adhesion quality improves, but the manufacturing complexity and cost increase
Solution Approach 1:
The invention extracts and eliminates the need for vacuum chambers and compression systems by using atmospheric pressure line contact attachment. The attachment head applies localized pressure along a line rather than requiring global vacuum compression, thereby achieving complete contact without the complex vacuum infrastructure
Solution Approach 2:
The invention replaces the vacuum-mechanical compression system with a simpler mechanical line contact system. The attachment head with its pressing mechanism provides sufficient contact pressure through direct mechanical action along a line, eliminating the need for vacuum chambers, seals, and compression actuators
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
The method effectively prevents adhesion interface lifting and improves the reliability of attaching adhesive films, touch panels, and flexible display panels to three-dimensional cover windows, ensuring high-quality adhesion without the need for expensive vacuum chamber equipment.
Implementation Method 1
a negative pressure chamber that provides a negative pressure to the adsorption hole
Data Source
AI summary
A method of manufacturing a flexible display device includes a first step of providing a three-dimensional cover window having a flat portion, and a curved portion that is bent in a third direction intersecting a first direction of the flat portion while extending to a second direction intersecting the first direction at both sides of the first direction, and a second step of attaching by a line contact at least one of an adhesive film, a touch panel, and a flexible display panel that are stacked at an inner surface of the cover window.