Input Device Dynamic Threshold Adjustment for Touch Panel
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Solution Overview
Problem
Electronic devices with touch panels face challenges in accurately determining a pressing operation due to varying force applied by users, depending on whether the device is held in their hand or placed on a surface, as existing solutions fail to account for these posture differences.
Innovation Solution
An input device with a housing and operation panel that adjusts the threshold level of pressing force based on whether the user is gripping the device and where they touch the panel, using a piezoelectric film made of chiral polymers like polylactic acid to detect pressing forces and generate accurate output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed pressing force threshold is used to detect pressing operations on the touch panel, then the detection method is simple, but the detection accuracy deteriorates because the pressing force varies according to user posture (whether the device is held in hand or placed on a surface)
Solution Approach 1:
The pressing force threshold is dynamically adjusted based on the detected gripping state. The system transitions from a fixed threshold to a variable threshold that adapts to different usage scenarios (one-hand holding vs. two-hand holding), thereby maintaining high detection accuracy across different postures without requiring complex manual configuration
Solution Approach 2:
The system uses grip detection means to continuously monitor the gripping state and provides feedback to the threshold determination means. This closed-loop feedback mechanism enables the threshold to be automatically adjusted according to the actual usage condition, resolving the contradiction between simple detection and accurate detection
2Reliability
If the pressing force threshold is increased to avoid false detection when the device is held in one hand, then false detection is reduced, but legitimate pressing operations become undetectable
Solution Approach 1:
The threshold dynamically adapts to the gripping state: a higher threshold is applied when one-hand holding is detected (reducing false detection), while a lower threshold is applied when two-hand holding is detected (enabling legitimate pressing operations). This dynamic adjustment resolves the contradiction between reducing false detection and maintaining operation recognition
Solution Approach 2:
The pressing force threshold parameter is changed based on the gripping state parameter. The system switches between different threshold values (first threshold for one-hand holding, second threshold for two-hand holding) to match the expected pressing force characteristics of each usage scenario, thereby maintaining both reliability and ease of operation
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 solution allows for precise detection of pressing operations by adjusting sensitivity according to the user's grip and posture, enhancing the accuracy of input recognition and user interaction with electronic devices.
Implementation Method 1
the press detecting means includes a piezoelectric film provided along one surface of the operation panel
Data Source
AI summary
A mobile terminal device receives an input of a pressing operation when an operation surface is pressed. A pressing amount detecting unit detects whether or not the operation surface has been pressed. A grip determining unit determines whether or not the housing has been gripped by a user. A threshold adjusting unit adjusts a press detection sensitivity of the pressing amount detecting unit when the housing is gripped by the user and when the housing is not gripped by the user. By this means, it is possible to provide an input device which adequately detects a pressing operation, and a program which is executed by this input device.