Active Pen Signal Polarity Inversion for Touch Sensitivity
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Solution Overview
Problem
Existing active pens for touch display screens have insufficient signal transmission, limiting the sensitivity of touch detection due to insufficient effective signal amounts during touch operations.
Innovation Solution
An active pen with a signal receiving device, processor, and signal transmitting device that processes and transmits a coupling voltage with opposite polarity to improve signal transmission, potentially amplified, to enhance touch detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If an active pen uses a conventional signal transmission method, then the structure is simple, but the effective signal amount during touch detection is insufficient
Solution Approach 1:
The signal processing function is segmented into three distinct modules: signal receiving device, processor, and signal transmitting device. The signal receiving device captures the coupling voltage, the processor inverts the polarity to generate the second coupling voltage, and the signal transmitting device transmits the processed signal to the touch display screen. This segmentation enables sufficient effective signal amount while maintaining clear functional separation.
Solution Approach 2:
The processor acts as an intermediary between the signal receiving device and the signal transmitting device. It receives the first coupling voltage from the signal receiving device, processes it by inverting polarity, and outputs the second coupling voltage to the signal transmitting device. This intermediary processing step is crucial for achieving the desired signal enhancement effect.
2Measurement precision
If the active pen transmits signal with sufficient effective signal amount, then the touch detection sensitivity is improved, but the device complexity increases
Solution Approach 1:
The signal processing system is divided into specialized components: the signal receiving device for capturing coupling voltage, the processor for polarity inversion, and the signal transmitting device for signal output. This segmentation achieves high touch detection sensitivity through coordinated function of multiple specialized components rather than a single complex unit.
Solution Approach 2:
The processor changes the polarity parameter of the coupling voltage signal, transforming the first coupling voltage into the second coupling voltage with opposite polarity. This parameter change is the core mechanism for enhancing the effective signal amount and improving touch detection sensitivity.
3Reliability
If the active pen includes signal processing components, then the signal transmission is improved, but the device complexity increases
Solution Approach 1:
The signal processing functionality is segmented into three reliable modules: signal receiving device for stable signal capture, processor for accurate polarity inversion, and signal transmitting device for consistent signal output. Each module is designed for its specific function, improving overall signal transmission reliability.
Solution Approach 2:
The system establishes a feedback loop where the processor continuously processes the coupling voltage signal from the signal receiving device and transmits the processed signal through the signal transmitting device. This closed-loop feedback mechanism ensures stable and reliable signal transmission by continuously monitoring and adjusting the signal parameters.
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 active pen increases the effective signal amount during touch detection, thereby improving the sensitivity of touch operations on touch display screens.
Implementation Method 1
a first coupling voltage between the active pen and the touch display screen
Implementation Method 2
process the first coupling voltage to obtain a second coupling voltage, and a polarity of the second coupling voltage is opposite to a polarity of the first coupling voltage
Implementation Method 3
transmit the second coupling voltage to the touch display screen
Implementation Method 4
amplify the second coupling voltage and provide the second coupling voltage, which is amplified, to the signal transmitting device
Data Source
AI summary
An active pen for a touch display screen, a touch input system, a method for driving an active pen, and a method for driving a touch input system are provided. The active pen includes: a signal receiving device, a processor which is in signal connection with the signal receiving device, and a signal transmitting device which is in signal connection with the processor. The signal receiving device is configured to receive a first coupling voltage between the active pen and the touch display screen. The processor is configured to process the first coupling voltage to obtain a second coupling voltage, and a polarity of the second coupling voltage is opposite to a polarity of the first coupling voltage. The signal transmitting deice is configured to transmit the second coupling voltage to the touch display screen.