Touch Screen Signal Processing for Mistaken Event Filtering
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Solution Overview
Problem
Existing touch screen technologies fail to accurately distinguish between genuine approaching or touching events and mistaken events caused by ghost points or water spots, leading to errors and unwanted consequences.
Innovation Solution
A method and apparatus that gather touch sensitive signal values, calculate the sum of differences with a baseline value, and determine if the sum is less than or equal to zero to identify mistaken approaching or touching events, thereby reducing or preventing incorrect reports to the host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch screen detects all approaching or touching events, then detection coverage is improved, but false detection from ghost points or water spots increases
Solution Approach 1:
The patent segments the touch detection process into multiple stages: initial event detection, line piece formation, line piece grouping, and palm detection. Each stage filters specific types of false detections, systematically eliminating ghost points, water spots, and palm interference while preserving genuine touch events.
Solution Approach 2:
The patent performs preliminary actions by forming line pieces from touch signal data before full event processing. This preliminary structuring allows the system to identify and exclude invalid patterns (ghost points, water spots) early in the processing chain, preventing false detections from propagating to the host system.
2Productivity
If touch screen reports all detected events to host, then event detection completeness is improved, but error commands increase
Solution Approach 1:
The patent introduces line pieces and line piece groups as intermediary data structures between raw touch detection and host reporting. These intermediaries serve as filtering layers that validate events before they reach the host, ensuring that only genuine touch events are reported while maintaining complete detection of all actual touches.
Solution Approach 2:
The patent implements feedback mechanisms where the system continuously monitors touch signal patterns and adjusts event reporting based on detected anomalies. When ghost points or water spots are identified through signal analysis, the system feedback-controls the reporting process to exclude these false events, maintaining high command accuracy.
3Measurement precision
If touch screen processes detailed signal analysis, then detection precision is improved, but processing complexity increases
Solution Approach 1:
The patent segments the complex signal processing into modular stages: signal value gathering, line piece formation, line piece grouping, and palm detection. Each module handles a specific aspect of analysis, making the overall complex process manageable and efficient through systematic division of labor.
Solution Approach 2:
The patent performs preliminary signal analysis by organizing raw touch data into line pieces before full event processing. This preliminary structuring simplifies subsequent analysis by pre-identifying potential false detection patterns, reducing the computational complexity of later validation stages.
Data Source
AI summary
The present application provides a method for determining mistaken approaching/touching event, comprising: gathering one or more touch sensitive signal value corresponding to a line piece; calculating a sum of differences of each signal value and a baseline value; and if the sum is less than or equals to zero, determining the line piece is corresponding to a mistaken approaching/touching event.