Ambient Light Sensors for Touchless Gesture Detection
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Solution Overview
Problem
Touchscreens on mobile devices face issues with accuracy due to finger obstruction during input and maintenance problems from fingerprints and smudges, necessitating an alternative input method.
Innovation Solution
The use of ambient light sensors to detect touch-less gestures by measuring changes in ambient light intensity, allowing for gesture recognition without physical contact with the screen.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If capacitive touch sensors are used for navigation, then users can interact with the display, but the user's finger obstructs the screen and leaves fingerprints and smudges
Solution Approach 1:
The patent introduces an intermediary system consisting of ambient light sensors and virtual overlay technology. The ambient light sensors detect finger gestures without physical contact, and virtual overlays are projected onto the screen to indicate selection areas, allowing user interaction without direct finger contact with the display surface.
Solution Approach 2:
The patent replaces the mechanical contact-based capacitive touch sensor system with an optical detection system using ambient light sensors. This substitution eliminates the need for physical finger contact with the screen, thereby preventing obstruction and contamination while maintaining navigation functionality.
2Measurement precision
If a mouse or equivalent input interface is used, then precise selection can be made, but it is not practical for handheld devices not used on a flat surface
Solution Approach 1:
The patent transitions from two-dimensional screen-based interaction to three-dimensional gesture recognition in the air space above the device. Ambient light sensors detect finger movements in three dimensions, allowing precise selection without requiring a flat surface, thus maintaining portability and usability.
3Productivity
If touch sensors require finger contact for navigation, then input can be made, but it leaves fingerprints and smudges on the screen
Solution Approach 1:
The patent replaces the mechanical contact-based touch sensor system with an optical detection system using ambient light sensors that detect finger gestures in the air above the screen. This substitution maintains input capability while eliminating the generation of fingerprints and smudges.
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
Enables accurate and maintenance-free gesture-based input on mobile devices, enhancing user interaction by allowing gestures to be recognized in three dimensions without obstructing the screen.
Implementation Method 1
A gesture is detected and identified based on a change in light intensity measured by each of the ambient light sensors at different time instants
Data Source
AI summary
A device and method to detect a gesture made by an object in touch-less communication with the device are described. The device includes a collection engine to collect light intensity measurements of light intensity at two or more measurement cycles from two or more ambient light sensors arranged at respective surface locations of the device. The device also includes a processor to identify the gesture based on the light intensity measurements at each of the two or more ambient light sensors at two or more of the two or more measurement cycles, and a memory device to store a gesture library that associates the gesture with an output signal.