Passive Stylus Resonance Circuit for Precise Touch Recognition
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Solution Overview
Problem
Existing passive stylus pens face challenges in precise touch recognition and signal transmission due to signal attenuation and the need for additional components, which hinder their widespread adoption and compatibility with miniaturized touch input devices.
Innovation Solution
A pen and touch input system featuring a stylus pen with a resonance circuit comprising a ferrite core and multiple-layered coil, and a sensor unit with specific pattern configurations, along with a control unit that applies and receives signals to determine precise touch points, addressing signal attenuation and enabling miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EMR sensor panel and EMR driving IC are added to achieve precise touch recognition, then measurement precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the EMR sensing function with the existing capacitance touch panel structure by integrating EMR sensor patterns directly into the touch sensor layers. This merging approach allows precise touch recognition without adding separate EMR sensor panels and driving ICs, thereby reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The touch sensor patterns are designed to serve dual functions: capacitance touch sensing and EMR sensing. By making the sensor patterns multifunctional, the patent eliminates the need for dedicated EMR sensing components, reducing overall device complexity while achieving precise touch recognition through EMR methodology.
2Measurement precision
If EMR sensor panel and EMR driving IC are added to achieve precise touch recognition, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges EMR sensing functionality with existing touch panel manufacturing processes by integrating EMR sensor patterns into standard touch sensor layers. This approach allows precise touch recognition without requiring separate EMR component manufacturing lines, thereby reducing manufacturing costs while maintaining measurement precision.
Solution Approach 2:
The sensor patterns are designed to perform both capacitance and EMR sensing functions, enabling a single manufacturing process to produce multifunctional sensors. This multi-functionality eliminates the need for additional EMR-specific manufacturing steps, reducing overall manufacturing costs while achieving precise touch recognition.
3Reliability
If driving signal frequency is adjusted to match resonance frequency for maximum output signal, then signal transmission quality is improved, but signal attenuation increases due to resonance coupling
Solution Approach 1:
The patent optimizes the resonance frequency parameter of the EMR sensor circuit to achieve maximum signal output while minimizing attenuation. By carefully tuning the resonance frequency and matching it with the driving signal frequency, the system achieves reliable signal transmission with reduced energy loss through optimized parameter selection.
Solution Approach 2:
The system incorporates feedback mechanisms to monitor signal transmission quality and adjust driving parameters in real-time. This feedback allows the system to maintain optimal resonance coupling conditions, ensuring high signal transmission quality while compensating for and minimizing signal attenuation through dynamic parameter adjustment.
4Measurement precision
If coil density is increased to improve signal reception capability, then measurement precision is improved, but device thickness and area increase
Solution Approach 1:
The patent extracts the EMR sensing function from bulky three-dimensional coil structures and implements it using planar patterned conductors integrated into the touch sensor layers. This extraction approach maintains signal reception capability while dramatically reducing device thickness by eliminating the need for thick coil windings and associated structural support.
Solution Approach 2:
The patent transitions from three-dimensional coil structures to two-dimensional planar patterns for EMR sensing. By changing the dimensional approach from vertical coil windings to horizontal patterned conductors, the system achieves equivalent or improved signal reception capability while significantly reducing device thickness and enabling better integration with thin touch panel structures.
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 system enhances precise touch recognition, reduces signal attenuation, and supports miniaturization of touch input devices, improving the performance and usability of passive stylus pens.
Implementation Method 1
a resonance signal is required to have a great amplitude to more accurately distinguish a touch caused by the stylus pen
Implementation Method 2
a digitizer transmits an electromagnetic signal to the pen and then receives a resonance signal from the pen
Implementation Method 3
an inductor unit including a ferrite core disposed in the body unit and a coil wound in multiple layers around at least a portion of the ferrite core
Implementation Method 4
an inductor unit including a ferrite core disposed in the body unit and a coil wound in multiple layers around at least a portion of the ferrite core
Implementation Method 5
The capacitive resonance method uses a general capacitance touch sensor and a general touch controller IC
Data Source
AI summary
A pen and touch input system according to an embodiment of the present invention includes a touch input device including a sensor unit and a control unit for controlling the sensor unit and a stylus pen interacting with the touch input device.