Ultrasonic False Touch Prevention for Mobile Terminals
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Solution Overview
Problem
Mobile terminals with touch screens often experience false touches during calls due to contact between the screen and the user's face, leading to accidental button presses and disrupted calls.
Innovation Solution
A method and device that utilize bandpass ultrasonic signals to detect the movement of a mobile terminal relative to an obstacle, such as the user's face, by calculating ultrasonic feature vectors from received signals and disabling the touch function when a false touch condition is met, thereby preventing accidental screen interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch function is always enabled for user interaction, then the ease of operation is improved, but false touches occur during calls causing accidental button presses
Solution Approach 1:
The touch screen transitions from a static always-enabled state to a dynamic state that changes based on detected conditions. The system automatically enables or disables the touch function according to whether the terminal is approaching the user's face, making the touch availability adaptive rather than fixed.
Solution Approach 2:
The system uses proximity detection feedback to control touch screen behavior. When the terminal approaches the user's face during a call, the proximity sensor detects this and triggers automatic disabling of the touch function, preventing false touches while maintaining normal operation when away from the face.
2Reliability
If the touch function is disabled during calls to prevent false touches, then the reliability is improved, but the ease of operation deteriorates due to inability to interact with the screen
Solution Approach 1:
The touch function availability is made dynamic rather than statically disabled. The system continuously monitors proximity conditions and automatically adjusts touch screen enablement based on real-time detection, allowing interaction when appropriate and preventing false touches when the terminal is near the user's face.
Solution Approach 2:
The system changes the operational parameter of the touch function (enabled/disabled state) based on the proximity parameter. When the distance between the terminal and user's face falls within a threshold range, the touch function parameter is changed from enabled to disabled, and vice versa.
3Reliability
If proximity detection is used to control touch function, then the reliability is improved, but the device complexity increases due to additional sensors and processing
Solution Approach 1:
The proximity detection capability serves multiple functions: it detects both the presence of the user's face and controls the touch function state. This multi-functionality allows the system to achieve false touch prevention using an existing sensor capability rather than requiring dedicated hardware for touch prevention.
Solution Approach 2:
The system uses its own proximity detection capability to automatically control its touch function behavior. The terminal serves itself by detecting proximity conditions and autonomously enabling or disabling the touch function without requiring external control or additional specialized components.
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
Effectively prevents false touches on the screen, particularly during calls, by accurately detecting the mobile terminal's movement and disabling the touch function in time, thus reducing call interruptions.
Implementation Method 1
sending a bandpass ultrasonic signal; receiving a reflected ultrasonic signal
Implementation Method 2
calculating at least one ultrasonic feature vector according to the frequency domain information, the ultrasonic feature vector being used to characterize movement state information of the mobile terminal approaching or moving away from an obstacle
Data Source
AI summary
A method for preventing a false touch of a screen includes: sending a bandpass ultrasonic signal; receiving a reflected ultrasonic signal; calculating frequency domain information of the reflected ultrasonic signal; calculating at least one ultrasonic feature vector according to the frequency domain information, the ultrasonic feature vector being used to characterize movement state information of the mobile terminal approaching or moving away from an obstacle; constructing a feature vector set comprising the at least one ultrasonic feature vector; determining whether a condition for preventing a false touch is met according to the feature vector set; disabling a touch function of the touch screen in a case where the condition for preventing the false touch is met.