Foldable Display Shielding Layout for Stylus SNR and Layer Durability
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Solution Overview
Problem
Foldable electronic devices face challenges in improving touch detection performance and signal-noise-ratio (SNR) with stylus pens, particularly due to issues with adhesive and magnetic shielding layers that are prone to damage from repeated folding and affect reception sensitivity and accuracy.
Innovation Solution
A foldable electronic device design featuring a display panel with adhesive layers and magnetic shielding layers positioned to exclude portions of the folding area, ensuring the adhesive layers are spaced to minimize damage and the magnetic shielding layers are thicker than the adhesive layers, enhancing touch detection and SNR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If adhesive layers and magnetic shielding layers are positioned in the folding area, then the device structure is simplified, but the layers are prone to damage from repeated folding
Solution Approach 1:
The device structure is segmented by creating distinct folding areas and non-folding areas. The adhesive layers and magnetic shielding layers are specifically positioned in non-folding areas, separating them from the folding mechanics to prevent damage while maintaining overall structural integrity.
Solution Approach 2:
The solution transitions from a two-dimensional layout where all layers span the entire display area to a three-dimensional positioning strategy that utilizes the Z-axis (thickness direction) and strategically places layers in specific regions excluding the folding zone, thereby protecting sensitive components.
2Ease of manufacture
If adhesive layers are spaced closer together, then manufacturing is easier, but touch detection precision deteriorates
Solution Approach 1:
The invention optimizes the spacing parameter between adhesive layers to achieve a balance between manufacturing ease and touch detection precision. By carefully controlling the distance between adhesive layers, the system maintains sufficient spacing for accurate touch detection while remaining feasible for manufacturing processes.
3Volume of moving object
If magnetic shielding layers are made thinner, then device thickness is reduced, but signal-noise ratio deteriorates
Solution Approach 1:
The magnetic shielding layers are made thicker specifically in the non-folding areas where they are most needed for signal protection. This local quality enhancement provides superior magnetic shielding and improved signal-noise ratio for stylus detection, while the overall device thickness remains controlled through strategic positioning rather than uniform thickening.
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 design improves stylus pen reception sensitivity, enhances touch position accuracy, and enables palm rejection while maintaining a thinner form factor.
Implementation Method 1
a magnetic shielding layer attached under the display panel through the plurality of adhesive layers
Data Source
AI summary
A foldable electronic device according to an embodiment may include a display panel configured to be folded along a folding axis parallel to a first direction, a plurality of adhesive layers below the display panel, and positioned in an area excluding at least a portion of the folding area that forms a curved surface in a folded state of the display panel, and a magnetic shielding layer attached under the display panel through the plurality of adhesive layers.