PPG Sensor Gesture Control via Center of Gravity Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current user interface control methods for devices, such as joysticks and touchscreens, face challenges due to physical size constraints and limited screen real estate, necessitating alternative control technologies like motion recognition, which can be cumbersome and inefficient.
Innovation Solution
An electronic device equipped with a photoplethysmography (PPG) sensor having multiple isotropically arranged channels, capable of detecting changes in light scattered or reflected from an object, and a processor that generates control commands based on the center of gravity analysis of PPG signals, allowing for intuitive control of device functions and external devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a joystick is incorporated into a mobile device, then UI control functionality is provided, but the physical size of components increases the device complexity and space requirements
Solution Approach 1:
The patent replaces the mechanical joystick system with a photoplethysmography (PPG) sensor-based detection system. Instead of using physical mechanical components to detect user input, the system uses optical sensing to detect blood volume changes in the skin caused by subtle user gestures, thereby eliminating the need for large mechanical joystick components while maintaining UI control functionality.
Solution Approach 2:
The patent uses optical copying principles where the PPG sensor detects subtle skin surface changes caused by user gestures. The sensor captures optical signals that are copied from the physical gesture action, converting them into electrical signals for processing, thereby enabling control without direct mechanical contact or large physical components.
2Ease of operation
If a touchscreen is used for UI control, then control functionality is provided, but the limited screen size restricts the area available for interaction
Solution Approach 1:
The patent extends the interaction dimension from the 2D touchscreen surface to the 3D space above it. By using the PPG sensor to detect blood volume changes caused by gestures in the air space above the device, the system creates a new dimension for interaction that is not constrained by the physical screen boundaries, allowing users to control the device without touching the limited screen area.
3Ease of operation
If motion recognition technology is used, then UI control is enabled without physical components, but the detection precision and reliability are reduced compared to direct contact methods
Solution Approach 1:
The patent replaces air-based motion recognition with a physiological signal-based detection system. Instead of detecting mechanical movements in the air, the PPG sensor detects subtle physiological changes in the skin (blood volume pulsations) caused by user gestures, providing more precise and reliable detection while maintaining contactless operation.
Solution Approach 2:
The patent changes the detection parameter from mechanical motion parameters to physiological optical parameters. By measuring blood volume changes through optical absorption variations in the skin, the system achieves higher precision gesture detection compared to traditional motion recognition, as physiological signals provide more stable and measurable data than air-based motion cues.
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 efficient and intuitive control of various devices by tracking changes in the center of gravity, facilitating gesture recognition and bio-information estimation, thereby overcoming size limitations and enhancing user interaction.
Implementation Method 1
at least one detector configured to detect light scattered or reflected from the object
Implementation Method 2
at least one detector configured to detect light scattered or reflected from the object
Data Source
AI summary
An electronic device and a control method using the same are provided. The electronic device may include: a photoplethysmography (PPG) sensor having a plurality of channels arranged isotropically; and a processor configured to: detect a center of gravity of an external force applied to a measurement area of the PPG sensor by an object, based on PPG signals that are detected from the plurality of channels when the object is in contact with the measurement area of the PPG sensor, and generate a control command based on a change in the detected center of gravity.