Stylus Attachment Sensing for Wireless Charging Alignment
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Solution Overview
Problem
Existing electronic devices lack efficient methods for wirelessly charging pen input devices while ensuring proper attachment and optimizing charging current based on tilt sensing values, leading to potential misalignment and reduced charging efficiency.
Innovation Solution
An electronic device equipped with a communication module, tilt sensor, and processor that determines the attachment state of a pen input device by synchronizing tilt sensing values between the device and the pen, controlling the wireless charging current, and selectively displaying an attachment guide to ensure optimal charging and alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless charging is implemented for pen input devices, then charging convenience is improved, but charging efficiency deteriorates due to misalignment between the wireless charging coil and the pen
Solution Approach 1:
The system uses tilt sensors in both the electronic device and the pen to detect tilt angles and calculate the relative position between the wireless charging coil and the pen. Based on this feedback information, the processor dynamically adjusts the wireless charging current to optimize charging efficiency while maintaining charging convenience.
Solution Approach 2:
The processor changes the wireless charging current parameter based on the detected relative position of the pen. When misalignment is detected through tilt sensing, the system adjusts charging parameters to compensate and maintain optimal charging efficiency despite position variations.
2Measurement precision
If tilt sensing is used to determine attachment state, then alignment accuracy is improved, but device complexity increases due to additional sensors and processing
Solution Approach 1:
The tilt sensor serves multiple functions: it detects both the attachment state of the pen and the relative position for charging optimization. By making the tilt sensor multi-functional, the system achieves high alignment accuracy without adding separate sensors for each function, thereby limiting the increase in device complexity.
Solution Approach 2:
The system combines the attachment detection function and position sensing function into a single tilt sensing mechanism. The processor integrates both functions by analyzing tilt angle data to determine both whether the pen is attached and its relative position, reducing overall system 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
The solution enables accurate determination of the pen input device's attachment state, optimizing wireless charging efficiency and reducing misalignment issues, thereby improving charging performance and user experience.
Implementation Method 1
a wireless charging coil positioned inside the housing, and configured to charge a pen input device
Implementation Method 2
a pen attachment magnet aligned in a same direction as the wireless charging coil inside the housing, and configured to cause the pen input device to attach to a surface of the electronic device
Data Source
AI summary
An electronic device, including a communication module configured to communicate with a pen input device which is attachable to the electronic device; a tilt sensor configured to sense information about a tilt of the electronic device; a memory configured to store instructions; and at least one processor operatively connected to the communication module, and configured to execute the instructions to: determine an attachment state of the pen input device with respect to the electronic device based on a wireless charging state of the pen input device, a tilt sensing value of the pen input device, and a tilt sensing value of the electronic device; and based on the attachment state, control a wireless charging current for charging the pen input device, and selectively display an attachment guide of the pen input device