Foldable Digitizer Shielding Layout for Magnetic Interference
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Solution Overview
Problem
Foldable electronic devices with flexible displays face interference from magnetic fields generated by components like magnets, speakers, and vibration motors, which affect digitizer accuracy and pen pressure sensitivity.
Innovation Solution
Incorporating a magnetic shield layer and conductive layers with openings or slits to reduce magnetic field influence, preventing eddy currents and distortion of coordinates during pen input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a magnetic shield layer is disposed under the digitizer to reduce magnetic field influence, then the accuracy of digitizer inputs is improved, but the device complexity increases due to additional layers and components
Solution Approach 1:
The magnetic shield layer is integrated within the existing multi-layer structure of the digitizer assembly, nesting the shielding function within the conventional stack of display, touch sensor, and controller layers rather than adding a completely separate external component
Solution Approach 2:
The magnetic shield layer acts as an intermediary component positioned between the magnetic components (speaker, vibration motor) and the digitizer sensing elements, blocking magnetic field lines from directly reaching the sensitive areas while allowing other functions to proceed
2Reliability
If slits are formed in the conductive layer to reduce eddy currents and magnetic interference, then the signal distortion is reduced, but the manufacturing precision requirements increase due to the need for precise slit formation
Solution Approach 1:
The continuous conductive layer is segmented into multiple isolated conductive regions by forming slits, which breaks the closed-loop paths that would otherwise support eddy currents while maintaining local conductivity where needed for signal transmission
Solution Approach 2:
The conductive layer is modified locally by forming slits only in specific regions where magnetic interference and eddy currents are most problematic, while preserving the conductive properties in other areas where signal transmission is critical
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
Enhances the accuracy of digitizer inputs by minimizing magnetic interference, ensuring precise pen pressure detection and reducing signal distortion.
Implementation Method 1
a magnetic shield layer (or a magnetic shield agent) may be disposed under a digitizer. The magnetic shield layer may be capable of reducing the influence of the magnetic force of magnetic components
Implementation Method 2
at least a portion of a conductive layer of the digitizer may be removed to form an opening or slits... in order to reduce a magnetic field affecting the digitizer, a slit may be formed
Data Source
AI summary
According to certain embodiments, an electronic device comprises: a display; a coil array layer disposed under the display; a magnetic layer disposed under the coil array layer; a conductive layer disposed under the magnetic layer; a conductive plate disposed under the conductive layer; a bracket disposed under the conductive plate; and a magnetic component disposed on the bracket and under the conductive plate, wherein the conductive layer has a first opening, and the first opening and the magnetic component at least partially overlap each other.