Ferrite-Core Stylus Resonance for Precise Touch Recognition
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Solution Overview
Problem
Existing technologies face challenges in producing a passive stylus pen capable of precise touch recognition due to signal attenuation and the need for additional components like EMR sensors and ICs, which are costly and difficult to mass produce.
Innovation Solution
A pen and touch input system with a stylus pen that includes a resonance circuit comprising a ferrite core and a coil wound in multiple layers, along with a capacitor, to enhance signal transmission and recognition, and a control unit that applies and receives signals to and from specific patterns on the sensor unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If EMR method is used for passive stylus pen, then writing and drawing quality is improved, but device thickness increases and manufacturing cost increases due to additional EMR sensor panel and driving IC
Solution Approach 1:
The patent merges the EMR sensing function with the existing capacitance touch panel by integrating EMR sensors into the touch sensor structure. The EMR sensor panel is combined with the capacitance touch sensor in a single layer, eliminating the need for separate EMR sensor panels and reducing overall device thickness while maintaining precise stylus recognition
Solution Approach 2:
The touch sensor panel serves multiple functions simultaneously: it acts as both a capacitance touch sensor for general touch input and an EMR sensor panel for precise stylus recognition. This multi-functionality eliminates the need for separate dedicated EMR sensing components, reducing device complexity and thickness
2Measurement precision
If EMR method is used for passive stylus pen, then writing and drawing quality is improved, but manufacturing cost increases due to additional EMR sensor panel and driving IC
Solution Approach 1:
The patent combines EMR sensing capabilities with the existing capacitance touch panel infrastructure. By integrating EMR sensors into the touch sensor layer and utilizing the existing touch controller IC for signal processing, the system eliminates the need for separate EMR driving ICs and reduces manufacturing costs while maintaining high precision stylus recognition
Solution Approach 2:
The existing capacitance touch controller IC is made multi-functional by enabling it to process both capacitance touch signals and EMR signals. This eliminates the need for additional dedicated EMR driving ICs, reducing component count and manufacturing cost while maintaining precise stylus detection capabilities
3Measurement precision
If resonance frequency is matched for accurate stylus touch recognition, then measurement precision is improved, but signal transmission becomes difficult due to extremely great attenuation
Solution Approach 1:
The patent utilizes resonance phenomena where the stylus pen and touch sensor are tuned to the same resonance frequency. This resonance coupling enables efficient energy transfer and signal transmission between the stylus and sensor, overcoming signal attenuation issues while maintaining accurate touch recognition
Solution Approach 2:
The patent optimizes signal transmission by adjusting the resonance frequency parameters of both the stylus pen and touch sensor to match. By carefully controlling the resonant frequency and coupling parameters, the system achieves strong signal transmission with minimal attenuation, enabling accurate stylus detection
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 enables precise touch recognition and reduced signal attenuation, allowing for wider frequency bandwidth and improved performance, especially on larger screens, while maintaining cost-effectiveness.
Implementation Method 1
technologies of an electro magnetic resonance (EMR) method that is an inductive resonance method
Implementation Method 2
a resonance signal is required to have a great amplitude to more accurately distinguish a touch caused by the stylus pen. Thus, a driving signal transmitted to the stylus pen needs to have the almost same resonance frequency as that of the resonance circuit contained in the stylus pen
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.