Foldable Digitizer Shield Layout for Stable Pen Coupling
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Solution Overview
Problem
The frequent folding and unfolding of foldable mobile devices with electromagnetic induction coupling position detection sensors lead to deterioration of the metallic sheet portion in the electromagnetic sheet part, causing local changes in electromagnetic coupling energy levels.
Innovation Solution
The electromagnetic sheet is divided into multiple sheets spaced apart at the bending location, overlapping in a perpendicular direction when unfolded to reduce bending stress and maintain consistent electromagnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single electromagnetic sheet is used to cover the digitizer surface, then electromagnetic shielding and magnetic path formation are effective, but the sheet deteriorates due to repeated folding and unfolding at the bending location
Solution Approach 1:
The electromagnetic sheet is divided into multiple separate sheets (first electromagnetic sheet and second electromagnetic sheet) that are spaced apart at the bending location. This segmentation prevents the sheet from deteriorating due to repeated folding while maintaining electromagnetic shielding effectiveness when the device is in the unfolded state, as the sheets overlap to form a continuous shield.
2Duration of action of stationary object
If the electromagnetic sheet is divided into multiple sheets spaced apart at the bending location, then bending stress is reduced and service life is extended, but electromagnetic shielding effectiveness may be compromised
Solution Approach 1:
The multiple electromagnetic sheets are arranged to overlap in the vertical direction (perpendicular to the digitizer surface) when the device is unfolded. This three-dimensional arrangement ensures that the sheets form a continuous electromagnetic shield when needed, while being spaced apart horizontally at the bending location to reduce stress during folding.
3Reliability
If a continuous electromagnetic sheet is used, then electromagnetic shielding is effective, but the sheet cracks or deteriorates at the bending location after repeated folding
Solution Approach 1:
The electromagnetic sheet is segmented into multiple separate sheets with spacing at the bending location, preventing crack propagation and structural deterioration while maintaining shielding effectiveness through vertical overlap when the device is unfolded.
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 configuration alleviates deterioration of the electromagnetic sheet and maintains consistent electromagnetic coupling levels, ensuring reliable operation of the position detection sensor.
Implementation Method 1
The first layer (magnetic path material layer) 1051 constituting the magnetic path material forms a magnetic path in an alternating magnetic field generated by the loop coils of the digitizer part 104
Implementation Method 2
a position detection sensor operable by electromagnetic induction coupling is used
Implementation Method 3
The second layer (electromagnetic shield layer) 1052 used for providing electromagnetic shielding performs the function of preventing alternating magnetic fields from radiating out of the underside of the position detection sensor 103
Data Source
AI summary
A foldable position detection sensor operable by electromagnetic induction coupling is configured to alleviate the problem of the levels of electromagnetic coupling with an electronic pen locally changing at a bending portion of the sensor. The position detection sensor includes a digitizer that includes an electrode configured to couple with a position indicator by electromagnetic induction coupling. The position detection sensor includes multiple electromagnetic sheets disposed to cover a surface of the digitizer opposite to an input surface thereof for receiving input form the position indicator. The multiple electromagnetic sheets are spaced apart from one another along the surface of the digitizer at a bending location where the digitizer is bent. The electromagnetic sheets are configured such that when the digitizer is in an unfolded state the electromagnetic sheets overlap with one another at the bending location in a direction perpendicular to the input surface of the digitizer.