Radar Vital Function Detection for Display Power Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display control devices using motion detection technologies, such as infrared sensors and cameras, suffer from false alarms and privacy concerns, particularly in low-light conditions, leading to inefficient power management in display systems.
Innovation Solution
A display control device incorporating a radar circuit and an evaluation circuit to detect vital functions like heartbeat and breathing, allowing for precise determination of a person's presence and activity state, thereby controlling display power consumption accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional motion detection technologies (infrared sensors, cameras) are used to control display power consumption, then power saving is achieved when no one is viewing, but false alarms occur leading to inadvertent turn-off when users are present
Solution Approach 1:
The detection function is segmented into multiple independent sensor types (motion sensor, proximity sensor, light sensor) that each detect different aspects of user presence. By dividing the detection task across multiple specialized sensors rather than relying on a single sensor type, the system achieves more reliable detection with reduced false alarms while maintaining power saving capabilities.
Solution Approach 2:
A control unit acts as an intermediary that receives and evaluates signals from multiple sensors before making the final decision to turn the display on or off. This intermediary processing layer analyzes the combined information from motion, proximity, and light sensors to distinguish between genuine absence and situations that should not trigger power saving, thereby improving detection reliability.
2Measurement precision
If cameras are used for motion detection, then detection capability is improved, but privacy concerns arise and performance degrades in low light conditions
Solution Approach 1:
The camera function is extracted from the detection system and replaced with non-visual sensors (motion sensors using infrared, proximity sensors using electromagnetic waves, light sensors). This extraction removes the privacy concerns associated with video recording while maintaining detection capabilities through alternative physical principles that work independently of visible light conditions.
Solution Approach 2:
The optical detection system (camera) is substituted with electromagnetic wave-based detection systems (infrared motion sensors, proximity sensors using electromagnetic waves). These alternative detection mechanisms do not rely on visible light, enabling reliable operation in low light conditions without the privacy implications of visual recording.
3Area of stationary object
If display size is increased for entertainment systems, then user experience is improved, but power consumption approximately doubles from 40 inch to 60 inch display
Solution Approach 1:
Instead of continuous operation, the display is controlled to operate periodically based on detected user presence. The system alternates between active display mode and power-saving mode, with the transition timing determined by sensor detection. This periodic operation pattern allows large displays to consume significantly less energy during periods when they are not being viewed, while maintaining full functionality when users are present.
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 solution effectively reduces power consumption by accurately distinguishing between a person being present and asleep or absent, ensuring the display is only active when needed, thereby achieving significant energy savings and addressing privacy concerns.
Implementation Method 1
a radar circuit (11) for detecting a vital function of a person by receiving an electromagnetic wave reflected from the person
Data Source
AI summary
Display control devices and methods are provided. Vital functions of a person are detected using a radar circuit, and power consumption of a display is controlled based on the detected vital functions.