Foldable Digitizer Hole Patterns for Reliable Fold-Area Sensing
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Solution Overview
Problem
Existing electronic apparatuses with digitizers face challenges in maintaining sensing performance in folding parts, leading to reduced functionality and user experience.
Innovation Solution
The electronic apparatus incorporates a digitizer design with sensing coils and connection lines in non-folding and folding parts, featuring specific hole configurations and insulation to enhance sensing performance in folding areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the digitizer uses a conventional design with uniform hole patterns and coil arrangements, then the manufacturing process is simple, but the sensing performance in folding parts deteriorates due to structural constraints and reduced coil activation area
Solution Approach 1:
The patent applies different hole patterns (first holes in central portion, second and third holes in outer portion) to different regions of the folding part. The outer portion has distinct hole configurations compared to the central portion, allowing optimized sensing performance in each region while accommodating the folding structure's mechanical constraints.
Solution Approach 2:
The folding part is divided into a central portion and an outer portion with different hole patterns and coil arrangements. This segmentation allows each region to be optimized independently for its specific functional requirements, with the central portion focusing on active area sensing and the outer portion addressing peripheral sensing needs.
2Measurement precision
If the digitizer maintains a simple coil arrangement, then the device complexity is low, but the sensing sensitivity in folding areas deteriorates due to limited coil activation and connection line constraints
Solution Approach 1:
Different coil arrangements are implemented in different regions: first sensing coils in the central portion and second sensing coils in the outer portion. Each coil type is optimized for its specific location, with connection lines configured to maintain electrical connectivity while accommodating the folding motion and maximizing sensing sensitivity in each region.
3Manufacturing precision
If the digitizer uses a rigid structure to maintain manufacturing precision, then the manufacturing precision is high, but the durability in folding areas deteriorates due to stress concentration and material fatigue
Solution Approach 1:
The patent employs a flexible substrate that can accommodate folding motions while maintaining structural integrity. The flexible nature of the substrate allows the digitizer to withstand repeated folding cycles without cracking or delamination, ensuring long-term durability in the folding part while maintaining manufacturing precision through controlled fabrication processes.
Data Source
AI summary
An electronic apparatus includes a display module and a digitizer, in which first and second non-folding parts are arranged in a first direction, and a folding part foldable along a folding axis and between the first non-folding part and the second non-folding part are defined. The digitizer includes sensing coils on the first non-folding part and the second non-folding part and connection lines on the folding part and connected to the sensing coils. The folding part includes a central portion overlapping the active area and provided with first holes, and an outer portion overlapping the peripheral area and provided with second holes and third holes. Each of the second holes has a shape different from a shape of each of the first holes, and each of the third holes has a shape different from the shape of each of the first holes and the shape of the second holes.