Digitizer Fingertip Recognition Using Signal Pattern Verification
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Solution Overview
Problem
Existing digitizer systems struggle to accurately differentiate between fingertip touch inputs intended for user interaction and other detected signals, such as hand touches or mechanical changes, which are not intended for interaction.
Innovation Solution
The system employs pre-determined signal patterns and amplitude gradients detected on a grid of conductive lines, using differential amplifiers to verify that a signal input is a fingertip touch by recognizing specific patterns and rejecting signals that do not meet predefined thresholds or gradients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a digitizer uses a matrix of conducting lines to detect touch signals, then it can detect both electromagnetic stylus and fingertip touches, but it cannot reliably differentiate between intended fingertip touches and other detected signals such as hand rests or mechanical changes
Solution Approach 1:
The patent segments the touch detection process into multiple verification stages: initial signal detection, pattern recognition, and verification against pre-determined fingertip patterns. This segmentation allows the system to process signals in stages, filtering out false positives while maintaining detection capability.
Solution Approach 2:
The patent changes the parameters of signal analysis by examining not just the presence of a signal but also its spatial distribution pattern, amplitude gradient, and relationship to pre-determined fingertip characteristics. This parameter transformation enables reliable differentiation between fingertip touches and other contacts.
2Productivity
If the digitizer accepts all detected signals as valid input, then user interaction responsiveness is high, but false interpretations from hand rests or mechanical changes occur
Solution Approach 1:
The patent performs preliminary verification by comparing detected signal patterns against pre-determined fingertip touch patterns before accepting input. This preliminary action filters out false positives while maintaining fast response to legitimate touches, as the verification occurs in parallel with the touch detection process.
Solution Approach 2:
The system incorporates feedback by continuously monitoring the signal pattern and comparing it against established fingertip characteristics. This feedback mechanism allows the system to correct and verify inputs in real-time, ensuring accuracy without delaying user interaction.
3Measurement precision
If the system uses complex pattern recognition to verify fingertip touches, then touch accuracy improves, but the processing complexity and computational requirements increase
Solution Approach 1:
The patent applies local quality analysis by examining the specific spatial distribution and gradient characteristics of signals in the immediate vicinity of the detected touch point. This localized analysis reduces processing complexity compared to analyzing the entire digitizer surface, while maintaining high verification accuracy.
Solution Approach 2:
The system uses partial action by focusing pattern recognition only on the most relevant signal characteristics (amplitude gradient, spatial pattern, relationship to conductive lines) rather than analyzing all possible signal parameters. This selective approach achieves sufficient accuracy without excessive computational complexity.
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
This approach effectively differentiates between intended fingertip touch inputs and unintended signals, improving the accuracy of user interaction detection and reducing false inputs, thereby enhancing the usability of touch-sensitive devices.
Implementation Method 1
The digitizer sensor includes a matrix of vertical and horizontal conducting lines and sensors to sense an electric signal. Positioning the physical object at a specific location on the digitizer provokes a signal whose position of origin may be detected.
Data Source
AI summary
A method for verifying a fingertip touch input to a digitizer, the method comprises detecting a pattern of signals obtained from conductive lines of a digitizer sensor, comparing the pattern to a pre-determined fingertip characteristic, and recognizing a fingertip touch input based on the comparison.