Curved Pressing Unit for Bubble-Free Flexible Display Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for manufacturing flexible display devices face challenges in bonding the display panel and window without generating bubbles, leading to non-uniform bonding and quality defects.
Innovation Solution
An apparatus with a first pressing unit and a second pressing unit, where the second pressing unit has a curved surface and a pressing buffer portion, uses a material with shore hardness ranging from 10 to 30, and an elastic member like silicon gel or urethane foam, to bond the display panel and window starting from the center, preventing bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a display panel and a window are bonded using conventional pressing methods, then the bonding process is simple, but bubbles are generated between the bonded components leading to non-uniform bonding
Solution Approach 1:
The pressing unit incorporates a curved pressing surface with a specific radius of curvature that matches the curvature of the display panel. This curved surface design allows the pressing force to be distributed uniformly across the entire bonding area, preventing bubble formation while maintaining bonding uniformity without requiring complex multi-element apparatus structures.
Solution Approach 2:
The patent specifies precise parameters for the pressing unit including a radius of curvature between 50mm to 150mm, and pressing force between 10kg to 50kg. By optimizing these parameters, the pressing apparatus achieves uniform bonding and eliminates bubble generation while keeping the apparatus structure relatively simple and manageable.
2Reliability
If conventional bonding methods are used, then the process is rapid, but bubble generation occurs leading to quality defects
Solution Approach 1:
The pressing unit is pre-configured with the optimal curved surface geometry and pressing force parameters before the bonding process begins. This preliminary setup ensures that when bonding occurs, the uniform pressing force is immediately applied, preventing bubble formation from the start and maintaining both high reliability and rapid processing without requiring complex real-time adjustments.
3Manufacturing precision
If uniform bonding is achieved through multiple pressing points, then bubble formation is prevented, but the apparatus becomes more complex
Solution Approach 1:
Instead of using multiple discrete pressing points or elements, the patent employs a single continuous curved pressing surface. This curved surface naturally distributes the pressing force uniformly across the entire bonding area through its geometry, achieving the same effect as multiple pressing points but with a much simpler single-element structure.
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 approach ensures uniform bonding, minimizes defects, and enhances the quality of flexible display devices by preventing bubble generation during the lamination process, allowing for rapid and accurate manufacturing.
Implementation Method 1
at least the second mounting surface of the second pressing unit may be formed of an elastic member having pressing buffer power
Data Source
AI summary
An apparatus for manufacturing a flexible display device, including a first pressing unit including a recess, a window within the recess and having two end portions with a first radius of curvature, the window contacting a display panel, and a second pressing unit facing the first pressing unit, the display panel being between the first and second pressing units, wherein the second pressing unit includes an upper portion having a second radius of curvature and a convex second mounting surface, the second radius of curvature being different from the first radius of curvature, a pressing buffer portion extending from opposite portions of the upper portion and having a third radius of curvature different from the second radius of curvature, a lateral portion connected to the pressing buffer portion, and a lower portion connected to the lateral portion at an obtuse angle.