Foldable Digitizer Common-Line Coil Layout for Hinge Sensing
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Solution Overview
Problem
Existing electronic devices with digitizers face challenges in maintaining improved folding characteristics and sensing sensitivity in folding areas, particularly due to the activation and coordination of sensing coils.
Innovation Solution
The electronic device incorporates a digitizer design with a folding part and non-folding parts, utilizing shared common lines for sensing coils, insulated open loops, and specific coil configurations to enhance sensing sensitivity and folding performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sensing coils are activated in the folding area, then sensing sensitivity is improved, but folding characteristics deteriorate due to coil interference and structural stress
Solution Approach 1:
The digitizer is divided into folding and non-folding parts, with sensing coils selectively activated only in non-folding areas. This segmentation allows the folding regions to move freely without coil interference while maintaining sensing capability in stable areas, resolving the contradiction between sensing sensitivity and folding characteristics.
Solution Approach 2:
The system dynamically controls the activation state of sensing coils based on the operational mode. Coils are activated only when the device is in a non-folding state and deactivated during folding operations. This dynamic control allows the digitizer to adapt to different operational states, maintaining both folding flexibility and sensing sensitivity as needed.
2Area of stationary object
If multiple sensing coils are activated simultaneously, then sensing coverage is improved, but coordination complexity increases
Solution Approach 1:
Instead of activating all sensing coils simultaneously across the entire digitizer area, the system activates only the necessary subset of coils in non-folding regions. This partial action approach provides sufficient sensing coverage for typical input operations while significantly reducing the coordination complexity compared to full-array activation.
3Ease of manufacture
If common lines are shared among sensing coils, then manufacturing complexity is reduced, but signal interference increases
Solution Approach 1:
Different line configurations are used in different regions of the digitizer. Common lines are shared in non-folding areas where signal interference is manageable, while isolated lines are used in folding areas to prevent interference. This local differentiation allows manufacturing simplification where applicable while maintaining signal integrity in critical regions.
Data Source
AI summary
An electronic device includes a display module and a digitizer that is disposed under the display module and that includes a folding part folded about a folding axis extending in a first direction and a first non-folding part and a second non-folding part spaced apart from each other in a second direction crossing the first direction with the folding part therebetween. The digitizer includes a plurality of sensing coils, and different sensing coils among the plurality of sensing coils are shared through a common line disposed at least in the folding part.