Digitizer Loop Group Layout for Foldable Display Wiring
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Solution Overview
Problem
Existing flexible display devices face issues with unrecognized areas, reduced folding characteristics, and cracking of digitizer wiring when folded, particularly in touch-sensitive devices using electronic pens.
Innovation Solution
A digitizer design with specific hole configurations and loop groups, reinforced with glass fiber-reinforced plastic, ensures improved folding characteristics and minimizes wiring cracks by distributing lines across multiple layers, enhancing input sensing accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the digitizer uses a conventional wiring structure without specific hole configurations, then the manufacturing process is simpler, but unrecognized areas occur and folding characteristics are reduced
Solution Approach 1:
The wiring structure is segmented into multiple loop groups (first loop group with loops having long sides in the first direction, and second loop group with loops having long sides in the second direction) that are selectively arranged in different regions. This segmentation allows the wiring to adapt to folding requirements in specific areas while maintaining simplicity in other areas, thus improving folding characteristics without excessive overall complexity.
Solution Approach 2:
Different loop configurations are applied to different regions of the digitizer. The first loop group is arranged in regions requiring enhanced folding flexibility, while the second loop group is arranged in regions requiring different mechanical properties. This local differentiation optimizes folding characteristics in critical areas without unnecessarily complicating the entire wiring structure.
2Strength
If the digitizer wiring is arranged in a conventional manner without multi-layer distribution, then the manufacturing process is simpler, but wiring cracks occur when the display device is folded
Solution Approach 1:
The wiring structure transitions from a single-plane arrangement to a multi-layer three-dimensional configuration. Loops are distributed across multiple layers with different spatial arrangements, which分散s the mechanical stress during folding and prevents crack propagation along a single path, thereby enhancing wiring crack resistance.
Solution Approach 2:
The digitizer employs a composite structure combining multiple wiring layers with different loop configurations (first loop group and second loop group) arranged in specific patterns. This composite wiring architecture provides enhanced mechanical strength and crack resistance compared to conventional single-layer wiring structures.
3Measurement precision
If the digitizer uses a simple loop arrangement without specific directional orientations, then the design is simpler, but input sensing accuracy is reduced
Solution Approach 1:
The loop arrangement employs asymmetric directional orientations with the first loop group having loops whose long sides extend in the first direction, and the second loop group having loops whose long sides extend in the second direction. This asymmetric configuration optimizes the sensing response for different input directions and types, thereby improving input sensing accuracy.
Solution Approach 2:
The loop configuration parameters are optimized by varying the orientation and dimensions of loops in different groups. The first loop group uses loops with long sides in the first direction for optimal sensing in that orientation, while the second loop group uses loops with long sides in the second direction. This parameter differentiation enhances overall sensing accuracy without requiring excessive structural complexity.
Data Source
AI summary
A digitizer includes, a folding portion including a first hole, a second hole on one side of the first hole, and a third hole on one side of the first hole and the second hole, a first non-folding portion on one side, a second non-folding portion on the other side, a first loop group containing loops having a long side, and a second loop group containing loops having a long side, wherein the folding portion includes a first row in which the first hole and the third hole overlap and a second row in which the second hole and the third hole overlap, among the loops in the first loop group, each loop which at least partially overlaps the folding portion includes lines crossing the folding portion along the first row or the second row, and the lines are in equal numbers in the first row and the second row.