Touch-Sensitive Surface Stylus Proximity Sensitivity Control
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Solution Overview
Problem
Touch-sensitive devices that detect both stylus and non-stylus inputs often register unintentional non-stylus inputs due to user interactions while handling or writing, leading to false positives.
Innovation Solution
The solution involves disabling, reducing, or modifying the sensitivity to non-stylus inputs when a stylus is proximate to the touch-sensitive surface by defining a proximity zone, adjusting threshold requirements based on the stylus's presence, and calibrating sensitivity thresholds and zone sizes to differentiate and ignore unintentional inputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch-sensitive surface is made sensitive to both stylus and non-stylus inputs, then the device allows natural gestures and handwriting input, but unintentional touches from fingers or hands are registered as false positive inputs
Solution Approach 1:
The patent applies different sensitivity characteristics to different input sources on the same touch-sensitive surface. The surface is configured to detect both stylus inputs (with high sensitivity for handwriting/gestures) and non-stylus inputs (with lower sensitivity to filter false positives). This local differentiation of input handling resolves the contradiction by allowing versatile input methods while maintaining reliable distinction between intentional and unintentional touches.
2Ease of operation
If the sensitivity to non-stylus inputs is increased to capture valid finger touches, then natural gesture input is improved, but unintentional touches while handling the device are more likely to be registered
Solution Approach 1:
The patent dynamically adjusts the sensitivity threshold parameter for non-stylus input detection. By changing the detection threshold based on contextual factors (such as whether a stylus is detected, current application state, or touch characteristics), the system can increase sensitivity for valid gestures while maintaining high thresholds to reject unintentional touches, thus resolving the contradiction between ease of operation and false positive reduction.
3Reliability
If the sensitivity to non-stylus inputs is reduced to eliminate false positives, then input accuracy is improved, but valid finger-based gestures and touches are more likely to be missed
Solution Approach 1:
The patent implements dynamic sensitivity adjustment where the threshold for detecting non-stylus inputs is not fixed but adapts based on operational context. The system can lower thresholds when gestures are expected or when no stylus is present, and raise thresholds when stylus input is active or when the device is being handled. This dynamic approach resolves the contradiction by maintaining high reliability while preserving ease of operation for valid gestures.
Data Source
AI summary
Aspects of the present invention reduce the number of false positive touch inputs made by a non-stylus object such as the user's finger or hand. When the stylus is located proximate to the touch-sensitive surface, the sensitivity of the surface to non-stylus input is disabled, reduced, or otherwise modified. For example, non-stylus inputs may be ignored while the stylus is within a proximity zone defined near the touch-sensitive surface. Further aspects of the present invention are directed to adjusting the threshold requirements of a non-stylus input depending upon where on the touch-sensitive surface the input is made. Still further aspects of the present invention are directed to calibrating various sensitivity thresholds for non-stylus input, as well as the size and/or shape of the proximity zone.