Digitizer Shielding Part for Folding Electronic Devices
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Solution Overview
Problem
Existing electronic devices with digitizers face challenges in maintaining effective shielding performance, particularly in folding parts, which can lead to interference and reduced sensing accuracy.
Innovation Solution
The electronic device incorporates a digitizer with a shielding part that includes an adhesive layer with openings, first and second shielding layers with folding and non-folding portions, and a protective layer. These components work together to improve shielding performance when the device is folded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shielding part is used in a folding area, then the device structure is simple, but the shielding performance deteriorates due to electromagnetic interference in the folding part
Solution Approach 1:
The shielding part is divided into multiple shielding layers (first shielding layer and second shielding layer) with distinct folding portions and non-folding portions. Each layer is segmented to independently manage electromagnetic shielding in different regions, allowing the folding area to be properly shielded while maintaining structural simplicity through modular design
Solution Approach 2:
The shielding part incorporates local quality variations by creating folding portions with specific curvature radii that differ from the non-folding portions. The adhesive layer also has differentiated regions with openings positioned to expose specific folding portions, providing localized electromagnetic shielding enhancement precisely where needed in the folding area
2Adaptability or versatility
If the shielding part is made with continuous material, then the shielding effectiveness is high, but the flexibility and folding capability are reduced
Solution Approach 1:
The shielding part is designed with dynamic flexibility by incorporating folding portions that can bend with predetermined curvature radii. The adhesive layer is configured with openings that allow the folding portions to move and adapt during folding operations, enabling the shielding part to dynamically adjust its shape while maintaining electromagnetic shielding effectiveness through the coordinated movement of multiple shielding layers
3Manufacturing precision
If the adhesive layer covers the entire shielding part, then the bonding strength is maximized, but the folding performance and shielding accuracy are reduced due to restricted movement
Solution Approach 1:
The adhesive layer has openings that extract or remove adhesive material from specific regions, allowing the folding portions of the shielding layers to move freely during folding operations. This extraction of adhesive from critical folding areas enables precise shielding accuracy while the adhesive in non-folding areas maintains sufficient bonding strength
Solution Approach 2:
The adhesive layer exhibits local quality differentiation by having openings positioned at specific locations to expose folding portions, while maintaining adhesive coverage in other regions. This localized variation in adhesive presence provides optimal bonding strength where needed while enabling flexibility and precision in the folding areas
Data Source
AI summary
A display module including a folding area, a first non-folding area, a second non-folding area and a digitizer that is disposed under the display module and that includes a sensing part including sensing coils and a shielding part disposed under the sensing part. The shielding part includes an adhesive layer including an opening overlapping the folding area, a first shielding layer disposed inside the adhesive layer and that includes a first folding portion overlapping the folding area and a first non-folding portion overlapping the first non-folding area, a second shielding layer disposed inside the adhesive layer and including a second folding portion overlapping the folding area and a second non-folding portion overlapping the second non-folding area, and a protective layer disposed under the adhesive layer, the first folding portion and the second folding portion overlap each other and are exposed by the opening.