Touch Panel Trace Layout for Wireless Pen Charging Noise
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Solution Overview
Problem
Conductive traces in electronic devices are vulnerable to noise interference during wireless charging of pen-type input devices, leading to malfunction or poor touch input performance.
Innovation Solution
The electronic device is designed with conductive traces on opposite sides of the touch panel to avoid interference from the wireless charging pad, and includes a method to adjust the touch circuit's operation frequency and sampling count based on noise levels to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If conductive traces are placed close to the wireless charging pad for compact design, then device size is reduced, but noise interference increases causing touch input malfunction
Solution Approach 1:
The patent positions conductive traces on opposite sides of the touch panel, utilizing the spatial dimension to separate noise-sensitive elements from the wireless charging pad. This dimensional separation allows compact device design while maintaining adequate noise isolation distance between components.
Solution Approach 2:
The patent applies different spatial arrangements to different regions of the touch panel. Noise-sensitive conductive traces are specifically positioned on sides opposite to the wireless charging pad, while other regions maintain standard configurations. This localized quality adjustment optimizes noise protection without compromising overall device compactness.
2Object-affected harmful factors
If conductive traces are spaced far from the wireless charging pad to reduce noise, then noise interference decreases, but device complexity and area increase
Solution Approach 1:
The patent divides the touch panel into distinct regions based on noise sensitivity. Conductive traces are segmented and assigned to specific sides of the touch panel opposite to the wireless charging pad, creating clear spatial zones for noise-sensitive and noise-generating components. This segmentation simplifies routing decisions and reduces overall system complexity.
3Speed
If touch circuit operates at high frequency for responsive touch input, then touch responsiveness is improved, but susceptibility to charging noise increases
Solution Approach 1:
The patent introduces spatial separation as an intermediary protective measure between the high-frequency touch circuit and the wireless charging pad. By positioning conductive traces on opposite sides of the touch panel, the system maintains high touch responsiveness while the spatial intermediary reduces direct noise coupling, allowing high-frequency operation without excessive noise susceptibility.
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 design minimizes noise interference, ensuring smooth touch input performance during wireless charging of pen-type input devices by spacing conductive traces away from the charging pad and dynamically adjusting the touch circuit's operation to reduce interference.
Implementation Method 1
a wireless charging pad configured to wirelessly transmit power to the pen-type input device
Implementation Method 2
a conductive trace connected to at least one side of the plurality of sides of the touch panel to transfer a touch signal detected on the touch panel to a touch circuit
Data Source
AI summary
An electronic device capable of wireless charging for a pen-type input device includes a display, a touch panel coupled to the display and having a plurality of sides facing in different directions, a conductive trace connected to the touch panel to receive a touch signal detected on the touch panel, and a wireless charging pad configured to wirelessly transmit power to the pen-type input device and disposed adjacent to one side of the plurality of sides of the touch panel, and the conductive trace is disposed on another side of the plurality of sides of the touch panel, the another side of the touch panel being opposite to the one side of the touch panel.