Touch Panel Press Detection Under Vibration Using State-Dependent Filtering
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Solution Overview
Problem
Existing press detection systems fail to adequately address the requirements for both the first state (before a definitive value exceeds a threshold) and the second state (after the definitive value falls below a threshold) due to vibrations, leading to false detections and user discomfort.
Innovation Solution
A press detection apparatus that determines a temporal change in pressing force, preventing steep increases or decreases in the definitive value during these states to accurately detect user intentions, using a determination unit that adjusts thresholds based on peak values and applies limitations to prevent false detections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the definitive value responds steeply to pressing force changes, then the detection speed improves, but false detections increase due to vibrations
Solution Approach 1:
The patent applies dynamics by making the response characteristics of the definitive value state-dependent. In the first state (before first event), the system allows steep changes to maintain fast detection. In the second state (after first event), the system prevents steep changes to eliminate false detections from vibrations. This dynamic adjustment of response characteristics resolves the contradiction between detection speed and reliability.
Solution Approach 2:
The patent changes the parameter of definitive value response steepness based on the detection state. By switching between allowing steep changes (first state) and preventing steep changes (second state), the system optimizes both detection speed and reliability for different operational phases, resolving the contradiction.
2Speed
If the definitive value decreases steeply when pressing force decreases, then the release detection speed improves, but false release detections increase due to vibrations
Solution Approach 1:
The patent dynamically adjusts the response characteristics of the definitive value based on the detection state. In the first state, steep decreases are allowed for fast release detection. In the second state, steep decreases are prevented to avoid false release detections caused by vibrations. This state-dependent dynamic adjustment resolves the contradiction between release detection speed and reliability.
3Reliability
If vibration reduction processing is applied continuously, then false detections are reduced, but the responsiveness to intentional presses deteriorates
Solution Approach 1:
The patent segments the detection process into two distinct states: first state (before first event) and second state (after first event). Different vibration reduction processing is applied to each state - minimal processing in the first state to maintain responsiveness, and strong processing in the second state to reduce false detections. This segmentation resolves the contradiction between reliability and speed.
Solution Approach 2:
The patent dynamically switches the level of vibration reduction processing based on the detection state. In the first state, the system maintains high responsiveness with minimal filtering. In the second state, the system applies strong vibration reduction to eliminate false detections. This dynamic adjustment resolves the contradiction between false detection reduction and press responsiveness.
Data Source
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AI summary
In a first state before a first event is detected, a determination unit of a press detection apparatus prevents the definitive value from increasing steeply when the pressing force has increased steeply, and decreases the definitive value steeply when the pressing force has decreased steeply. In a second state after the first event is detected and before a second event is detected, the determination unit prevents the definitive value from increasing steeply when the pressing force has increased steeply, and prevents the definitive value from decreasing steeply when the pressing force has decreased steeply. This reduces the possibility that the definitive value increases steeply in the first state and the and increases and decreases steeply in the second state even under vibration.