Wireless Power Coil Grounding for Touch Sensor Integration
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Solution Overview
Problem
The challenge of integrating a wireless charging pad into electronic devices with limited space, while maintaining the slim form factor and ensuring the performance of touch sensing circuits, is addressed.
Innovation Solution
The coil for wireless charging is positioned on or near the rear surface of the substrate including the touch sensing circuit, allowing for wireless power transmission to external devices and grounding the coil when not in use to maintain touch sensing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a wireless charging pad is integrated into the electronic device, then wireless charging functionality is provided, but the space of the electronic device is limited and the slim form factor is compromised
Solution Approach 1:
The wireless charging coil is merged with the touch sensing circuit substrate, allowing the coil to be disposed on the same substrate as the touch sensing circuit. This integration eliminates the need for a separate wireless charging pad, thereby providing wireless charging functionality while maintaining the limited space and slim form factor of the electronic device.
Solution Approach 2:
The substrate is designed to serve multiple functions: it acts as both the touch sensing circuit substrate and the wireless charging coil substrate. By making the substrate universal for both touch sensing and wireless charging purposes, the electronic device achieves dual functionality without requiring additional space for separate components.
2Adaptability or versatility
If the coil is disposed on the substrate including the touch sensing circuit, then wireless charging is enabled, but the touch sensing performance may be degraded due to noise from the coil
Solution Approach 1:
The electrical connection state of the coil is dynamically changed based on operational mode. During wireless charging operation, the coil is electrically connected to the power transmission circuit. During touch sensing operation, the coil is electrically disconnected from the power transmission circuit and connected to ground, thereby dynamically adjusting the coil's electrical state to prevent noise interference with touch sensing while maintaining wireless charging capability when needed.
Solution Approach 2:
The coil alternates between two electrical connection states: connected to the power transmission circuit during wireless charging mode, and connected to ground during touch sensing mode. This periodic switching of electrical connection states ensures that the coil does not generate noise during touch sensing operations, thereby maintaining touch sensing performance while enabling wireless charging functionality.
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 enables wireless charging without compromising the touch sensing functionality by shielding the circuit from noise and ensuring reliable operation.
Implementation Method 1
a power transmission circuit for wirelessly transmitting power through the coil
Implementation Method 2
the performance of the touch sensing circuit may be ensured by electrically connecting the coil to the ground of the electronic device
Data Source
AI summary
An electronic device is provided. The electronic device includes a substrate comprising a touch sensing circuit, which includes a first layer, a second layer overlapping with the first layer, a plurality of first electrode lines arranged on the first layer in a first direction, and a plurality of second electrode lines arranged on the second layer in a second direction that is vertical with respect to the first direction, a coil arranged to at least partially overlap with the substrate, a power transmission circuit for wirelessly transmitting power through the coil, a ground electrically connected to the power transmission circuit, and a control circuit electrically connected to the coil and the ground, wherein the control circuit can be configured to selectively connect the coil to the power transmission circuit or the ground.