Foldable Hinge Shielding Layout for Stable Pen Inductance
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Solution Overview
Problem
Magnetic field interference from a hinge in a foldable electronic device causes fluctuations in the inductance of a pen input device, leading to malfunction, particularly when the hinge is composed of materials with high magnetic permeability or magnetic force.
Innovation Solution
A foldable electronic device design incorporating a shielding member to minimize inductance fluctuations, featuring a flexible display with a shielding space between the hinge and digitizer, paired with first and second shielding members of higher resistance to mitigate magnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hinge is made from materials with high magnetic permeability or magnetic force to achieve strong magnetic characteristics, then the magnetic field interference on the pen input device increases, but the hinge structural strength and stability are improved
Solution Approach 1:
A shielding member is introduced as an intermediary component between the hinge and the pen input device. This shielding member blocks or redirects magnetic field lines, preventing them from directly affecting the pen input device while allowing the hinge to maintain its strong magnetic characteristics for structural stability
Solution Approach 2:
The harmful magnetic field effect is extracted or isolated from the pen input device by placing the shielding member in between. The shielding member absorbs or redirects the magnetic field, separating the hinge's magnetic function from its harmful interference effect on the pen input device
2Length of moving object
If the hinge is made thinner using high-strength materials to reduce device thickness, then the device becomes slimmer, but the magnetic field interference increases due to higher magnetic force concentration
Solution Approach 1:
The shielding member serves as a mediator that allows the hinge to be thin and strong while preventing concentrated magnetic field interference. It distributes or blocks the magnetic field lines, enabling the use of thin high-strength hinge materials without sacrificing pen input device functionality
3Device complexity
If no shielding member is used to reduce device complexity, then the device structure is simpler, but the pen input device malfunctions due to inductance fluctuations from hinge magnetization
Solution Approach 1:
A relatively simple shielding member is introduced as an intermediary component. While it does add a component, the shielding member can be implemented as a thin sheet or simple structure that blocks magnetic field interference, significantly improving pen input device reliability with minimal added complexity
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 shielding members effectively reduce the influence of hinge magnetization on pen input device inductance, ensuring stable operation even when the hinge is made of high-strength, thin materials, thus maintaining pen input functionality during folding and unfolding.
Implementation Method 1
a shielding member to minimize inductance fluctuations, featuring a flexible display with a shielding space between the hinge and digitizer, paired with first and second shielding members of higher resistance to mitigate magnetic interference
Implementation Method 2
a hinge may be magnetized by an external magnetic force to generate a magnetic field, and a magnetic field due to hinge magnetization may cause fluctuation and malfunction of a coil inductance of a pen input device
Data Source
AI summary
A foldable electronic device includes: a first housing; a second housing; a hinge structure rotatably connecting the first housing and the second housing; a flexible display on the first housing and the second housing; a folding area accommodated on the flexible display; a shielding space facing the folding area and being between the hinge structure and the flexible display; a pair of digitizers being spaced apart below the flexible display; a pair of first shielding members below each of the pair of digitizers and being spaced apart from each other by the shielding space therebetween; and a plurality of second shielding members in the shielding space, wherein a first resistance of the plurality of second shielding members is higher than a second resistance of the pair of first shielding members.