Cover Window Concave Patterns for Adhesion and Bubble Prevention
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Solution Overview
Problem
Curved cover windows in display devices experience stress and delamination due to the force acting on them, leading to bubble formation between the cover window and the adhesive layer, which lowers display quality.
Innovation Solution
A cover window with a first area of curved shape and a second area of flat shape, featuring a higher density of concave patterns on the inner surface of the curved area to improve adhesion and prevent bubble formation by enhancing the wetting and bonding force with the adhesive layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a curved cover window is formed by bending the ends of a flat cover window, then the display device achieves a curved shape for aesthetic and modern design, but stress is generated at the interface between the cover window and the adhesive layer causing delamination and bubble formation
Solution Approach 1:
The patent applies local quality by creating concave patterns specifically at the curved portions of the cover window's inner surface where stress concentrates. These patterns are localized to the problematic areas rather than uniformly distributed, providing enhanced adhesion exactly where needed to counteract the bending-induced stress and prevent delamination and bubble formation.
Solution Approach 2:
The patent segments the inner surface of the cover window by introducing multiple concave patterns that divide the continuous surface into distinct regions. This segmentation increases the surface area and creates mechanical interlocking points with the adhesive layer, improving overall adhesion strength to resist the delamination force generated by the curved shape.
2Strength
If adhesive is applied to attach the display panel to the curved cover window, then the display panel is securely mounted, but bubbles occur between the cover window and adhesive layer due to stress, lowering display quality
Solution Approach 1:
The concave patterns are strategically placed at the curved portions of the cover window where stress concentration occurs. This localized enhancement of adhesion strength at critical areas prevents bubble formation specifically where the stress-induced delamination would otherwise occur, thereby maintaining display quality without requiring uniform reinforcement across the entire surface.
Solution Approach 2:
The concave patterns are pre-formed on the cover window surface before adhesive application. This preliminary structural modification creates ready-made anchoring points that guide adhesive flow and ensure proper wetting and bonding in advance, preventing bubble entrapment during the assembly process and ensuring strong initial adhesion.
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 concave patterns on the cover window increase adhesion and prevent bubble occurrence, thereby maintaining display quality and preventing delamination.
Implementation Method 1
The inner surface is patterned with a plurality of concaved portions. At least a subset of which has slanted side surfaces to interlock with adhesive placed on the inner surface for attaching the cover window to a display panel.
Data Source
AI summary
A display device comprises a cover window including a first area of a curved shape and a second area of a flat shape and having a first end connected to the first area, wherein the first area has a plurality of first concave patterns at its inner surface; a display panel under the cover window; and an adhesive layer between the cover window and the display panel.