Pressure Input Path Maintenance in Force Sensing Touch Screens
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Solution Overview
Problem
Force sensing touch screens often inaccurately interpret input gestures due to inconsistent pressure input, leading to premature termination of inputs and user frustration, particularly when a single sensor element is not activated, causing drop-out signals.
Innovation Solution
A method and apparatus for maintaining a pressure input path in a sensing array using a state vector calculation to predict the path and update location data points, even when no sensing elements are activated, thereby preventing drop-out and ensuring continuous input tracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single sensor element is not activated, then the system interprets this as the end of the press, but this causes inaccurate system response and input errors
Solution Approach 1:
The system performs preliminary actions by calculating a predicted path based on previously activated sensor elements before a complete press is detected. This allows the system to anticipate where the press should occur and maintain the input path even when individual sensor elements are temporarily inactive, preventing premature termination of valid inputs
Solution Approach 2:
A predicted path calculation acts as an intermediary between detected sensor activations and system response. Instead of directly responding to individual sensor element states, the system uses the predicted path to mediate and determine whether a press is still valid, filtering out temporary dropouts while maintaining accuracy
2Measurement precision
If the system requires consistent input from all sensor elements, then input accuracy improves, but gestures are prematurely terminated when minor signal dropouts occur
Solution Approach 1:
The system calculates a predicted path in advance based on the trajectory of previously activated sensor elements. This predicted path serves as a reference that allows the system to tolerate temporary signal dropouts without prematurely terminating the gesture, thereby maintaining both accuracy and processing efficiency
Solution Approach 2:
Instead of requiring complete and consistent activation of all sensor elements along the entire gesture path, the system uses partial activation data from previously detected elements to calculate the predicted path. This partial information is sufficient to maintain the input path and recognize the gesture correctly, reducing the stringency requirements
3Reliability
If the system terminates input on any sensor dropout, then false positives are reduced, but valid continuous gestures are incorrectly interrupted
Solution Approach 1:
The system performs preliminary path calculation based on previously detected sensor element activations. This predicted path is established before any dropout occurs, creating a reference that allows the system to distinguish between temporary signal losses and actual gesture terminations, preserving complete gesture data
Solution Approach 2:
The predicted path calculation provides continuous feedback about the expected gesture trajectory. By comparing actual sensor activations against this predicted path, the system can determine whether dropouts are within acceptable ranges or indicate genuine gesture termination, maintaining both signal validity and data completeness
Data Source
AI summary
A method of maintaining a pressure input path in a sensing array is described. The sensing array comprises a plurality of sensing elements, and the method involves activating a first sensing element to determine a first location data point and activating a second sensing element to determine a second location data point. The state location (x,y) and state velocity (Vx, Vy) are calculated based on the first and second location data points to create a state vector. A predicted path of further location data points is determined from the state vector to avoid drop out problems with pressure inputs.