Composite Touchscreen Detecting Lift-Off via Acoustic and Capacitive Sensing
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Solution Overview
Problem
Current touchscreens are limited in detecting the variety of inputs required by advanced graphic user interfaces and applications, particularly in gaming devices, where they struggle to accurately recognize specialized gestures and functions.
Innovation Solution
A composite touchscreen that combines acoustic pulse recognition and capacitive sensing technologies to detect touch and lift-off events, enabling precise x-y coordinate location and gesture recognition, thereby enhancing the gaming experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single touchscreen technology (acoustic or capacitive) is used, then the device structure remains simple, but the ability to detect variety of inputs and specialized gestures is limited
Solution Approach 1:
The patent combines acoustic pulse recognition technology and capacitive sensing technology into a single composite touchscreen system. The acoustic subsystem detects touch location through sound waves, while the capacitive subsystem detects lift-off events through electrical field changes. This merging allows the touchscreen to recognize a wider variety of inputs including specialized gestures that require both touch detection and lift-off detection, thereby improving adaptability without significantly increasing operational complexity
Solution Approach 2:
The composite touchscreen is designed to perform multiple functions using a single integrated structure. It can detect both touch events (via acoustic sensors) and lift-off events (via capacitive sensors), enabling it to recognize diverse gestures such as taps, drags, hovers, and multi-touch patterns. This multi-functionality allows the same physical touchscreen to support various input types and gesture recognition patterns without requiring separate detection systems
2Measurement precision
If acoustic pulse recognition is used for touch detection, then touch location can be detected, but lift-off detection capability is insufficient
Solution Approach 1:
The patent integrates acoustic pulse recognition sensors for precise touch location detection with capacitive sensing elements for lift-off detection. The acoustic subsystem maintains its strength in determining exact touch coordinates, while the capacitive subsystem adds the capability to detect when a finger approaches or leaves the screen surface. This combination allows the system to track both the position and state (contact or hover) of user input
3Adaptability or versatility
If capacitive sensing is used for lift-off detection, then gesture recognition is improved, but resistance to contaminants may be reduced
Solution Approach 1:
The composite touchscreen combines acoustic pulse recognition, which is inherently resistant to contaminants since it detects mechanical sound waves, with capacitive sensing for enhanced gesture recognition. The acoustic subsystem provides a reliable baseline for touch detection that is not affected by oils, moisture, or other contaminants on the screen surface, while the capacitive subsystem adds sensitivity for detecting subtle gestures like hovers and light touches. This dual approach maintains contaminant resistance while improving gesture recognition capabilities
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
The hybrid touchscreen effectively detects and maps inputs to gestures, improving the range of games and user interaction by accurately recognizing multiple simultaneous touches and lift-off events, even in the presence of contaminants, and providing a durable and resistant interface.
Implementation Method 1
a plurality of acoustic pulse sensors disposed upon a first surface of the transparent substrate and configured to detect an acoustic wave generated by an object making contact with the substrate
Implementation Method 2
a capacitive plate comprising a transparent conductive layer disposed upon a second surface of the transparent substrate... control circuitry configured to detect a lift-off of an object in contact with the capacitive plate
Data Source
AI summary
A composite touchscreen incorporates acoustic pulse recognition sensing and capacitive sensing technology. The hybrid screen incorporates the advantages of each technology while minimizing the drawbacks. When such a screen is incorporated in a gaming device specialized gestures and functions can be implemented that enhance the interface, the range of games, and the gaming experience.