Electronic Pen Sensing Device with Twisted Closed Loop Line
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Solution Overview
Problem
Conventional digitizers using electromagnetic induction techniques face limitations in accurately sensing the position of electronic pens due to the complexity of coil configurations and resistance variations, which affect sensing sensitivity and accuracy.
Innovation Solution
An electronic pen sensing device with a substrate featuring a sensing region and a sub-sensing region, where a first closed loop line is wound multiple times along the edges, and a controller calculates the pen's location based on the induced current, reducing equivalent resistance and improving sensing accuracy by selectively connecting sub-patterns to form a twisted closed loop structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional coil configurations are used in electromagnetic induction digitizers, then the structure is simpler to manufacture, but sensing sensitivity and accuracy deteriorate due to resistance variations
Solution Approach 1:
The sensing region is divided into multiple sensing block regions, and the closed loop line is segmented into multiple patterns (first pattern, second pattern, third pattern) that can be selectively connected. This segmentation allows the system to reduce equivalent resistance by choosing optimal path combinations while maintaining manageable manufacturing complexity through modular design.
Solution Approach 2:
The patent implements dynamic switching between different closed loop configurations by selectively connecting sensing block regions. The controller can change the equivalent resistance characteristics in real-time based on sensing requirements, transitioning between different pattern combinations to optimize both accuracy and resistance properties.
2Measurement precision
If multiple closed loop patterns are implemented to improve sensing accuracy, then sensing sensitivity improves, but device complexity and manufacturing cost increase
Solution Approach 1:
Multiple sensing block regions are merged into a unified closed loop structure through selective electrical connections. The first, second, and third patterns are combined in different configurations to form complete closed loops, allowing the system to achieve high sensing sensitivity through multiple patterns while sharing common manufacturing processes and materials.
Solution Approach 2:
The sensing block regions and pattern structures serve multiple functions: they form closed loops for electromagnetic induction, provide selectable resistance paths, and enable different sensing configurations. This multi-functionality reduces the need for separate components, thereby lowering manufacturing costs while maintaining high sensing accuracy.
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
Enhances sensing sensitivity and accuracy by reducing equivalent resistance and allowing for precise location calculation of the electronic pen, while also potentially reducing manufacturing costs through integrated pattern configurations.
Implementation Method 1
The electromagnetic induction technique generates a magnetic field by providing a current to a first coil and generates an induced electromotive force (or an induction current) based on the magnetic field using a second coil
Implementation Method 2
the electronic pen stores an induced electromotive force which is generated based on the first magnetic field, and the electronic pen generates a second magnetic field based on the induced electromotive force
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
An electronic pen sensing device includes: a substrate including a sensing region and a first sub sensing region, the first sub sensing region having a width smaller than a width of the sensing region; a first closed loop line disposed along edges of the sensing region and wound N times in a first rotation direction from a first node to a second node, and disposed along edges of the first sub sensing region and wound M times in a first rotation direction from the second node to the first node; and a controller configured to calculate a location of an electronic pen based on a first induction current which is output through the first node, wherein N and M are positive integers.