Touch Screen Contact Classification Using Motion and Surface Data
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Solution Overview
Problem
Touch-sensitive devices face challenges in accurately distinguishing between different types of contacts, such as finger and ear contacts, leading to unintended activation of touch screens when objects like ears or faces come into contact with the screen.
Innovation Solution
A system that analyzes touch surface data and motion data to classify contacts using an object classification component, which determines contact states and controls touch-sensitive functions accordingly, enabling or disabling screen activation based on the type of contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the touch screen is made sensitive to all types of contact, then the responsiveness to user input is improved, but false activation from non-user contacts (like ear or face contact) increases
Solution Approach 1:
The system changes multiple parameters simultaneously to distinguish between valid and invalid contacts: contact area size, contact duration, pressure force, and motion characteristics. By analyzing the combination of these parameters, the system can differentiate between intentional finger touches and accidental ear/face contacts, thereby maintaining high responsiveness while reducing false activation.
Solution Approach 2:
The system incorporates feedback mechanisms that analyze contact characteristics in real-time and adjust the activation threshold dynamically. When the system detects patterns consistent with ear or face contact (such as prolonged contact duration or specific pressure profiles), it adjusts the sensitivity to prevent false activation, while still responding to valid user inputs.
2Measurement precision
If the system uses multiple parameters to distinguish contact types, then the accuracy of contact classification is improved, but the complexity of the detection system increases
Solution Approach 1:
The system uses a single touch screen sensor that performs multiple functions: detecting contact presence, measuring contact area, gauging pressure force, and tracking motion characteristics. By making the existing sensor multi-functional, the system achieves high classification accuracy without adding separate detection devices, thus avoiding increased system complexity.
Solution Approach 2:
The system combines multiple detection capabilities (area detection, pressure sensing, motion tracking) into a unified analysis framework. Rather than using separate sensors for each parameter, the system integrates these measurements from the touch screen and analyzes them collectively to classify contact types, thereby maintaining simplicity while achieving high precision.
Data Source
AI summary
Techniques enabling improved classification of objects against a touch sensitive surface of a touch sensitive device are presented. An object classification component can analyze touch screen data associated with a touch sensitive surface associated with a device and motion information relating to motion along at least one axis associated with the device. The object classification component can determine a contact classification for an object with respect to the touch sensitive surface, based on a result(s) of the analyzing, and in response to determining a contact state of the object with respect to the touch sensitive surface. An event determination component can control a function associated with the touch sensitive surface based on the contact classification for the object, the function comprising enabling or disabling a touch sensitive function of the touch sensitive surface of a display screen of the device or switching the display screen on or off.