Capacitive Screen Stylus Distance Monitoring via Electromagnetic Induction
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Solution Overview
Problem
Existing capacitive screens that support styluses require high-voltage signal encoding to monitor the distance between the screen and the stylus, leading to increased power consumption, higher costs, and potential interference with the screen's display.
Innovation Solution
A capacitive screen incorporating a touch control chip and a screen coil, which generates electromagnetic signals to communicate with a stylus, allowing real-time distance monitoring without high-voltage encoding, thereby reducing power consumption and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-voltage signal encoding is used to monitor the distance between the capacitive screen and the stylus, then the distance monitoring capability is improved, but the power consumption increases
Solution Approach 1:
The patent replaces the traditional high-voltage signal encoding method with an electromagnetic induction-based detection system. The screen coil generates an electromagnetic signal that induces a current in the stylus coil, and the resulting signal is detected by the touch control chip to determine distance. This substitution eliminates the need for high-voltage encoding while maintaining distance monitoring capability, thereby reducing power consumption.
Solution Approach 2:
The patent changes the detection parameter from high-voltage signal encoding to electromagnetic induction signal detection. By using the screen coil to generate an electromagnetic signal and detecting the induced current in the stylus coil, the system achieves distance monitoring with lower power consumption. The touch control chip analyzes the characteristics of the induced signal to determine the distance between the screen and stylus.
2Measurement precision
If high-voltage signal encoding is used to monitor the distance between the capacitive screen and the stylus, then the distance monitoring capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent replaces the complex high-voltage signal encoding system with a simpler electromagnetic induction-based system. The screen coil and touch control chip can be integrated into the existing capacitive screen structure, eliminating the need for separate high-voltage encoding hardware. This simplification reduces manufacturing complexity and cost while maintaining distance monitoring functionality.
Solution Approach 2:
The screen coil serves multiple functions: it acts as both the display electrode for the capacitive screen and the electromagnetic signal generator for distance monitoring. The touch control chip also handles both touch detection and electromagnetic signal analysis. This multi-functionality reduces the need for additional components, thereby lowering manufacturing costs.
3Measurement precision
If high-voltage signal encoding is used to monitor the distance between the capacitive screen and the stylus, then the distance monitoring capability is improved, but the display quality deteriorates due to interference
Solution Approach 1:
The patent replaces high-voltage signal encoding with electromagnetic induction-based detection. The screen coil generates a low-voltage electromagnetic signal that does not interfere with the display, while the touch control chip detects the induced signal from the stylus coil to determine distance. This substitution eliminates the display interference caused by high-voltage encoding while maintaining accurate distance monitoring.
4Measurement precision
If an electromagnetic screen is added to monitor the distance between the capacitive screen and the stylus, then the distance monitoring capability is improved, but the device complexity increases
Solution Approach 1:
The patent merges the electromagnetic signal generation function into the existing capacitive screen structure. The screen coil is integrated as part of the display electrode, and the touch control chip handles both touch detection and electromagnetic signal analysis. This integration eliminates the need for a separate electromagnetic screen, reducing hardware complexity while maintaining distance monitoring capability.
Solution Approach 2:
The screen coil serves dual purposes: as the display electrode for the capacitive screen and as the electromagnetic signal generator for distance monitoring. The touch control chip also performs both touch detection and electromagnetic signal analysis. This multi-functionality reduces the need for additional components, thereby simplifying the overall device structure.
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
Enables timely and accurate communication and interaction between the capacitive screen and the stylus while maintaining low power consumption and cost, by using electromagnetic induction to determine the distance between the screen and the stylus.
Implementation Method 1
The screen coil, integrated into the capacitive screen as a metal coil, is configured to generate a first electromagnetic signal based on the current signal
Implementation Method 2
The screen coil is further configured to receive the second electromagnetic signal and convert it into a second current signal
Data Source
AI summary
The present application discloses a capacitive screen, a method for its interaction with a stylus, and a storage medium. The capacitive screen includes a touch control chip and a screen coil. The touch chip generates a first current signal, which the screen coil, integrated as a metal coil, converts into a first electromagnetic signal. This signal is sent to the stylus, which then returns a second electromagnetic signal to the screen coil. The screen coil converts this into a second current signal for the touch chip, which calculates the distance between the screen and stylus. This invention enables real-time distance monitoring and interaction between the screen and stylus with low cost and power consumption.