Foldable Magnet Array Layout for EMR Stylus Display Area
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Solution Overview
Problem
The magnetic field generated by magnets in a foldable electronic device reduces the area available for input devices using electromagnetic induction, such as a stylus pen, due to the repulsive force between separated housings when folded.
Innovation Solution
A magnet array with a designated three-dimensional multipolar magnetic array is used to deviate the direction of the magnetic field, reducing its magnitude on the display area while maintaining the gap reduction effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If magnets are disposed at two opposite ends of the separated housings to reduce the gap, then the gap reduction effect is improved, but the area available for input devices using electromagnetic induction is reduced
Solution Approach 1:
The magnet array is divided into multiple individual magnets arranged in a specific three-dimensional multipolar pattern. This segmentation allows the magnetic field to be distributed and directed in specific directions, creating strong magnetic force for gap reduction while confining the magnetic field interference to specific regions, thereby preserving more area for electromagnetic induction-based input devices.
Solution Approach 2:
Each magnet in the array is oriented with its magnetic polarity specifically to create strong magnetic field lines directed toward the opposing housing for gap reduction, while the local magnetic field distribution is optimized to minimize interference in the display area. This local quality optimization allows different regions of the magnetic array to serve different functions: gap reduction at the edges and minimal interference in the display area.
2Object-affected harmful factors
If a magnet array with three-dimensional multipolar magnetic array is used to deviate magnetic field direction, then the magnetic field interference on display area is reduced, but the device complexity increases
Solution Approach 1:
The complex three-dimensional multipolar magnetic array is implemented by segmenting the magnetic structure into multiple discrete magnets, each with a specific orientation. This segmentation makes the complex configuration manufacturable and assembleable, as each magnet can be individually positioned and oriented to achieve the desired multipolar pattern without requiring a single complex magnet structure.
Solution Approach 2:
The magnet array employs asymmetric arrangement and orientation of individual magnets to create the three-dimensional multipolar magnetic field pattern. This asymmetric configuration is optimized to deviate magnetic field lines away from the display area while maintaining strong attraction force for gap reduction, achieving the desired magnetic field distribution through deliberate asymmetric design rather than symmetric simplicity.
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
The solution effectively increases the available area for input devices by minimizing the magnetic field interference on the display, ensuring seamless functionality of input mechanisms in a foldable electronic device.
Implementation Method 1
magnets may be disposed at two opposite ends of the separated housings
Implementation Method 2
A magnet array with a designated three-dimensional multipolar magnetic array is used to deviate the direction of the magnetic field
Implementation Method 3
The electronic device may detect the magnetic field generated from the input device using electro magnetic induction (hereinafter, referred to as EMR) scheme
Data Source
AI summary
An electronic device is provided. The electronic device includes a foldable housing which has a hinge structure including a first housing and a second housing, the first housing is connected to the hinge structure and includes a first surface facing a first direction, a second surface facing a second direction opposite the first direction, and a first side surrounding the space between the first second surface, and the second housing is connected to the hinge structure and includes a third surface facing a third direction, a fourth surface facing a fourth direction opposite the third direction, and a second side, the first surface facing the third surface when the electronic device is in a folded state, and the third direction being the same as the first direction when the electronic device is in an unfolded state, a flexible display extending from the first and third surface, and a magnet array.