Sensor Layer Closed Loop Trace Line for Wireless Charging Interference
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Solution Overview
Problem
Existing electronic devices face challenges in achieving high sensing sensitivity, particularly when integrating features like touch-based input and pen input, due to interference from charging coils and other electromagnetic components.
Innovation Solution
The electronic device incorporates a sensor layer with a closed loop trace line configuration that overlaps the charging coil, dissipating electromagnetic induction noise as heat, thereby enhancing sensing sensitivity by reducing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a charging coil is integrated into the electronic device, then wireless charging capability is provided, but electromagnetic induction noise interferes with sensing accuracy
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the electromagnetic induction noise generated by the charging coil as a useful signal for wireless pen input sensing. The sensor layer detects the electromagnetic signal induced by the pen near the charging coil, transforming the previously harmful interference into a beneficial sensing mechanism for contactless pen input
2Ease of manufacture
If the sensor layer uses traditional electrode arrangements, then manufacturing is simplified, but sensing sensitivity is insufficient for pen input detection
Solution Approach 1:
The patent applies local quality by configuring specific electrodes (first and second electrodes) with particular orientations and positions in the sensor layer to optimize their sensitivity to electromagnetic signals from the pen. The electrodes are arranged to detect signals along specific directions, enhancing local sensing capability without complicating the overall manufacturing process
3Device complexity
If the sensor layer structure is simplified, then device complexity is reduced, but interference from charging coil cannot be effectively mitigated
Solution Approach 1:
Instead of adding complex shielding structures to block interference, the patent converts the harmful electromagnetic interference from the charging coil into a useful sensing signal. The sensor layer detects the electromagnetic field generated by the charging coil when a pen is nearby, transforming the interference problem into a contactless input capability without increasing device 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
This configuration improves the signal-to-noise ratio, ensuring enhanced sensing accuracy and sensitivity for touch and pen inputs, even in the presence of charging coil interference.
Implementation Method 1
dissipating electromagnetic induction noise as heat
Implementation Method 2
dissipating electromagnetic induction noise as heat
Data Source
AI summary
An electronic device includes a sensor layer including a sensing region and a peripheral region adjacent to the sensing region, which are defined therein. The sensor layer includes a plurality of first electrodes, a plurality of second electrodes, a plurality of first trace lines electrically connected to the plurality of first electrodes in a one-to-one correspondence, a plurality of second trace lines electrically connected to the plurality of second electrodes in a one-to-one correspondence, and a first loop trace line electrically connected to one second electrode among the plurality of second electrodes. A first closed loop includes one second trace line among the plurality of second trace lines connected to the one second electrode and the first loop trace line may be defined in the sensor layer.