Two-Axis Curvy Touch Panel Lamination Stress Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lamination processes for touch panels with three-dimensionally curved surfaces often result in non-uniform stress, leading to image distortions, creases, and peeling issues due to incompatibilities between the substrate and transparent conduction layers.
Innovation Solution
A lamination structure for a two-axis curvy touch panel with a transparent conduction module flatly laminated to a cover, where the lamination area is minimized to reduce stress, featuring a cover with a long and short axis and a transparent conduction module with specific size and shape ratios to prevent crease formation and peeling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the transparent conduction layer is laminated to cover the entire curved surface, then the coverage is complete, but non-uniform stress causes creases and peeling
Solution Approach 1:
The patent divides the lamination area into two distinct zones: a first lamination area where the transparent conduction layer is bonded to the curved surface, and a second lamination area where bonding is released. This segmentation allows stress to be concentrated in controlled regions, preventing the non-uniform stress distribution that causes creases and peeling across the entire surface.
Solution Approach 2:
Different regions of the lamination structure are given different properties: the first lamination area maintains bonding for structural integrity, while the second lamination area releases bonding to accommodate stress. This local differentiation in bonding quality allows the structure to handle the complexities of curved surfaces without uniform stress-induced defects.
2Area of stationary object
If the lamination covers the entire curved surface, then full coverage is achieved, but image quality deteriorates due to color lumps and water ripples
Solution Approach 1:
By segmenting the lamination area into bonded and non-bonded regions, the patent prevents the formation of color lumps and water ripples that occur when the entire curved surface is laminated. The segmentation allows stress to be managed in specific zones, preserving image quality in the visible areas.
Solution Approach 2:
The patent extracts or removes the lamination from the second area of the curved surface, eliminating the source of stress-induced image defects in that region. This selective removal of lamination prevents color lumps and water ripples while maintaining necessary bonding in critical areas.
3Shape
If the transparent conduction layer is formed to match the curved substrate shape, then shape compatibility is achieved, but stress concentration occurs at edges
Solution Approach 1:
The patent segments the lamination area to prevent edge stress concentration. By releasing the lamination in the second area, particularly near edges and corners of the curved surface, the structure accommodates shape compatibility while avoiding stress concentration that would occur with continuous edge-to-edge lamination.
4Stress or pressure
If the lamination area is reduced, then stress is reduced, but coverage area decreases
Solution Approach 1:
The patent applies local quality by differentiating bonding properties in different areas: the first lamination area provides necessary coverage and structural support, while the second lamination area releases bonding to reduce stress. This localized approach optimizes both stress reduction and coverage area without requiring a uniform reduction across the entire surface.
Data Source
AI summary
A lamination structure of two-axis curvy touch panel includes a cover having a touch surface and an inner surface opposite to the touch surface, wherein the touch surface is a curved surface that protrudes from edge to center and has a long axis and a short axis. A transparent conduction module is flatly laminated to the inner surface of the cover to reduce a stress generated by laminating the transparent conduction module. A lamination area of said transparent conduction module is less than an area of the inner surface of the cover. The lamination structure of touch panel of the present invention applies to a two-axis curvy touch panel, wherein the cover is flatly laminated to the transparent conduction module to reduce stress values or improve stress concentration.