Touch Panel Cover Structure with Patterned Shielding and Decoration Layer
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Solution Overview
Problem
The uneven surface of patterned shielding layers in touch panels due to decoration layers with irregular shapes causes issues with the smooth application of solid optical clear adhesive, leading to air bubbles and affecting the appearance quality of touch panels.
Innovation Solution
A cover structure for touch panels is designed with a patterned shielding layer and a decoration layer where the decoration layer's area is larger than the circumscribed region around the recess, and an exhaust structure is optionally included to facilitate the adhesion process, reducing air bubbles and enhancing appearance quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a decoration layer with irregular shape (matching recess) is formed on the patterned shielding layer, then the decorative pattern and visual color effect are achieved, but the surface becomes rough and uneven causing air bubbles in the adhesive layer
Solution Approach 1:
The decoration layer is designed with different thicknesses in different regions: a first thickness in the mark region and a second thickness in the visible region. This local differentiation allows the mark region to maintain surface flatness for proper adhesive application while the visible region provides the desired decorative appearance.
2Ease of manufacture
If the decoration layer follows the recess shape, then the decorative effect is achieved, but the adhesive cannot smoothly cover the surface leading to air bubbles
Solution Approach 1:
The decoration layer implements local quality by having different thicknesses in different regions. The mark region has a first thickness that ensures flat surface for reliable adhesive coverage, while the visible region has a second thickness that provides decorative effect. This resolves the conflict between decorative pattern application and adhesive coverage quality.
3Ease of manufacture
If the decoration layer has substantial thickness to match recess shape, then the decorative effect is achieved, but the surface roughness affects appearance quality
Solution Approach 1:
The decoration layer is designed with different thicknesses in different regions: a first thickness in the mark region and a second thickness in the visible region. This local differentiation allows the mark region to maintain surface flatness for proper adhesive application while the visible region provides the desired decorative appearance.
Data Source
AI summary
A cover structure of a touch panel includes a cover plate, a patterned shielding layer, and a decoration layer. The cover plate has a visible region and a peripheral region including a mark region. The patterned shielding layer is disposed on the cover plate, and the patterned shielding layer is disposed in the peripheral region. The patterned shielding layer includes at least one hollow structure disposed in the mark region. A circumscribed region surrounding the hollow structure is defined in the mark region. A frame edge of the circumscribed region overlaps a most prominent circumscribed edge of the hollow structure. The decoration layer is disposed in the peripheral region and covers the hollow structure. An area of the decoration layer is larger than an area of the circumscribed region. A shape of the decoration layer corresponds to a shape of the frame edge of the circumscribed region.