Stylus Pen Changeover Switch for Signal Detection
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Solution Overview
Problem
The existing touch panel systems face difficulties in accurately detecting the signal from a stylus pen due to the human body being driven along with the pen point, causing the signal to be buried in the palm placement region's signal, especially when the pen is gripped.
Innovation Solution
Incorporating a changeover switch in the stylus pen that connects the grip portion to either the pen point or ground, creating a potential difference between the grip and pen point, preventing the human body from being driven and allowing clear detection of the pen point signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the stylus pen is driven by radio with a synchronization circuit and driving circuit provided in the stylus pen, then the operability is enhanced, but the human body signal interferes with the pen point signal making position detection difficult
Solution Approach 1:
The patent segments the signal transmission by assigning different frequencies to the pen point signal and palm placement signal. The pen point operates at a first frequency while the palm placement operates at a second frequency, allowing the detection device to distinguish and separately process these signals, thereby resolving the interference problem while maintaining radio-driven operability
Solution Approach 2:
The patent changes the frequency parameter of the driven signal based on the detection result. When a palm placement is detected, the frequency of the driven signal is changed to avoid the frequency range of the palm placement signal, thereby eliminating interference and enabling accurate position detection while preserving the radio-driven operational capability
2Measurement precision
If the driven signal frequency is changed when palm placement is detected, then signal interference is avoided, but the system complexity increases
Solution Approach 1:
The detection device automatically detects palm placement signals and autonomously changes the frequency of the driven signal without requiring external intervention or complex control systems. This self-service mechanism resolves signal interference while minimizing system complexity by leveraging the existing detection capabilities of the device
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 satisfactory detection of the stylus pen's signal by preventing the human body from being driven, thus avoiding signal interference from the palm placement region, improving the signal-to-noise ratio and ensuring accurate position detection.
Implementation Method 1
a touch panel which has a plurality of electrostatic capacitances formed at respective intersections of a plurality of first signal lines and a plurality of second signal lines
Data Source
AI summary
For detecting a signal based on driving of a pen point of a stylus pen satisfactorily, a stylus pen (15) includes a changeover switch (34) having a grip portion terminal (35) of a grip portion (28), a pen point terminal (36) of a pen point (38), and a ground terminal (37) of a ground, the changeover switch (34) switching connection of the grip portion terminal (35) to either the pen point terminal (36) or the ground terminal (37).