Capacitance Module Coil Shield Layout for EMI-Controlled Haptics
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Solution Overview
Problem
Existing systems for measuring pressure inputs and providing haptic responses on touch surfaces of electronic devices face challenges in efficiently integrating inductive coils with magnetic elements to minimize electromagnetic interference and enhance haptic feedback.
Innovation Solution
A capacitance module design that includes a touch electrode, a multi-layer inductance coil structure deposited on multiple surfaces with coil shields positioned to reduce electromagnetic interference, and a magnet to provide haptic effects by interacting with the inductance coil.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an inductance coil is integrated into the capacitance module for pressure sensing and haptic feedback, then the functionality is enhanced, but electromagnetic interference with other electronic components increases
Solution Approach 1:
A coil shield is introduced as an intermediary component between the inductance coil and other electronic components within the capacitance module. The coil shield, positioned adjacent to the inductance coil, acts as a barrier that blocks or redirects electromagnetic fields, thereby reducing interference with neighboring electronic components while preserving the inductance coil's pressure sensing and haptic feedback functionality.
2Object-affected harmful factors
If coil shields are added to reduce electromagnetic interference, then interference is minimized, but device complexity increases
Solution Approach 1:
The coil shield is implemented as a thin, flexible conductive layer or film that can be deposited onto existing substrates within the capacitance module. This approach minimizes the additional volume and structural complexity introduced by the shield, allowing it to conform to the compact layout of the module without requiring bulky enclosures or complex mechanical structures.
3Force
If the inductance coil is positioned close to the magnet for effective interaction, then haptic feedback is enhanced, but electromagnetic interference with other components increases
Solution Approach 1:
The coil shield serves as a spatial mediator that allows the inductance coil to maintain its optimal position near the magnet for strong haptic feedback while simultaneously creating an electromagnetic barrier that prevents the generated fields from interfering with other electronic components in the module.
4Measurement precision
If pressure sensing accuracy is improved by enhancing coil-magnet interaction, then measurement precision increases, but electromagnetic interference increases
Solution Approach 1:
The coil shield enables high-precision pressure sensing by allowing strong magnetic interaction between the coil and magnet while blocking the resulting electromagnetic fields from coupling with sensitive electronic components, thus maintaining measurement accuracy without sacrificing signal integrity.
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 measures pressure inputs by detecting changes in the distance between the inductance coil and the magnet, and provides enhanced haptic responses by focusing electromagnetic energy towards the magnet, thereby improving the accuracy and reliability of pressure sensing and haptic feedback.
Implementation Method 1
the inductance coil is positioned to interact with a magnet adjacent to the inductance coil
Implementation Method 2
the first coil shield and the second coil shield are positioned to reduce electromagnetic interference between the inductance coil and other electronic components of the capacitance module
Implementation Method 3
the magnet is configured to provide a haptic effect on the capacitance module by moving the inductance coil with a change in a magnetic force
Data Source
AI summary
A capacitance module may include at least one touch electrode on a first surface of the capacitance module; a first portion of an inductance coil deposited on a second surface of the capacitance module; a second portion of the inductance coil deposited on a third surface of the capacitance module; a first coil shield deposited on the second surface of the capacitance module; and a second coil shield deposited on the third surface of the capacitance module; where the first portion of the inductance coil and the second portion of the inductance coil are electrically connected; where the inductance coil is positioned to interact with a magnet adjacent to the inductance coil; and where the first coil shield and the second coil shield are positioned to reduce electromagnetic interference between the inductance coil and other electronic components of the capacitance module.