Touchscreen Signal Recognition With Dual-Mode Scanning
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Solution Overview
Problem
Passive-type styluses with small tips and poor conductivity generate small signal amounts, leading to broken lines and interference on large touchscreens, especially when fingers, watermarks, or environmental noises are present, resulting in poor writing performance.
Innovation Solution
A dual scanning method is employed, utilizing mutual capacitance scanning and self-capacitance scanning within a scanning cycle to recognize touch signals, filtering out interference by determining touch signals with a corresponding ground signal and a preset trigger area condition, enhancing recognition accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a passive-type stylus with small tip and poor conductivity is used, then the writing precision is improved, but the signal amount is reduced and interference increases
Solution Approach 1:
The patent segments the signal detection process into multiple scanning modes (first scanning mode and second scanning mode) within a single scanning cycle. The first scanning mode detects touch signals using conventional methods, while the second scanning mode specifically detects ground signals to identify interference. This segmentation allows the system to distinguish between valid touch signals and interference, resolving the contradiction between writing precision and signal reliability.
Solution Approach 2:
The patent introduces an intermediary detection mechanism by adding a second scanning mode that detects ground signals as an intermediate step. This intermediary detection process helps identify whether a detected touch signal is actually caused by interference (such as fingers, watermarks, or environmental noises) or is a valid stylus input, thereby maintaining both writing precision and signal reliability.
2Device complexity
If conventional single scanning mode is used, then the device complexity is reduced, but the signal recognition accuracy deteriorates
Solution Approach 1:
The patent segments the scanning process into multiple modes (first scanning mode for touch signal detection and second scanning mode for ground signal detection) within a single scanning cycle. This segmentation enables the system to perform both touch signal recognition and interference identification without requiring separate scanning cycles, thereby improving signal recognition accuracy while controlling device complexity.
Solution Approach 2:
The patent implements continuous scanning by performing both the first scanning mode and second scanning mode within a single scanning cycle. This continuous action ensures that touch signals and ground signals are detected without interruption, improving recognition accuracy while avoiding the complexity of multiple separate scanning cycles.
3Measurement precision
If multiple scanning modes are implemented, then the signal recognition accuracy is improved, but the power consumption increases
Solution Approach 1:
The patent implements both scanning modes within a single continuous scanning cycle, eliminating the need for separate scanning cycles. This continuous action reduces the total time the touchscreen is active, thereby reducing power consumption while maintaining high signal recognition accuracy through the dual-mode detection process.
Solution Approach 2:
The patent uses periodic scanning by implementing multiple detection modes within a single scanning cycle that repeats periodically. This periodic action with optimized cycle structure ensures efficient power consumption while maintaining accurate signal recognition, as the system performs necessary detections during each cycle without extending the overall periodic duration significantly.
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
Improves the recognition rate of touch signals with small signal amounts by distinguishing between grounded conductive media and interference factors, ensuring accurate detection and reducing power consumption while enhancing user experience.
Implementation Method 1
A passive-type stylus changes the capacitance of a touchscreen through contact between a conductive material and the touchscreen
Data Source
AI summary
A touchscreen signal recognition method includes, within a scanning cycle, in response to a first scanning instruction, recognizing a touch signal on a touchscreen in a first scanning mode, within the same scanning cycle, in response to a second scanning instruction, determining whether the touch signal of the touchscreen has a corresponding ground signal in a second scanning mode, and in response to a trigger area of the touch signal meeting a preset condition, and the touch signal corresponding to the ground signal, determining the touch signal as a target signal.