Display Ring Light Layout for Accurate Finger Heart Rate Detection
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Solution Overview
Problem
Conventional optical fingerprint technologies for heart rate detection suffer from low accuracy due to interference and noise in light signals, leading to inaccurate heart rate measurements.
Innovation Solution
A heart rate detection method and apparatus that utilizes a ring light-emitting region on a display screen, with a non-light-emitting intermediate region, to capture heart rate detection light signals reflected by a user's finger, employing periodic acquisition and filtering techniques to enhance signal accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional optical fingerprint technology is used for heart rate detection, then the detection function is achieved, but the accuracy is low due to interference and noise in light signals
Solution Approach 1:
The display screen's light-emitting region is segmented into a ring-shaped light-emitting area with an intermediate non-light-emitting region. This segmentation isolates the heart rate detection light signals from other display content, eliminating interference and noise while maintaining detection accuracy.
Solution Approach 2:
The intermediate region of the ring light-emitting region is designed to be a non-light-emitting region, creating a localized dark area that captures only the reflected light from the user's finger. This local quality change ensures that the captured light signals contain only heart rate information without interference from surrounding display content.
2Illumination intensity
If the entire display screen emits light for fingerprint detection, then sufficient light is provided, but interference from display content reduces detection accuracy
Solution Approach 1:
The light-emitting region is segmented into a ring shape with an intermediate non-light-emitting region. This provides sufficient illumination for fingerprint detection while preventing display content in the intermediate region from interfering with heart rate signal capture.
Solution Approach 2:
The harmful light emission from the intermediate region is extracted/removed by designating it as a non-light-emitting region. This eliminates the source of interference while maintaining adequate illumination from the ring-shaped light-emitting regions.
3Duration of action of stationary object
If continuous light emission is used for detection, then continuous monitoring is achieved, but interference from display screen light emission patterns reduces accuracy
Solution Approach 1:
The ring light-emitting region emits light periodically rather than continuously, with the light emission synchronized to specific time intervals. This periodic action allows the sensor to capture heart rate signals during designated time windows while avoiding interference from continuous display screen illumination patterns.
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
Improves the accuracy of heart rate detection by eliminating interference and noise, ensuring the captured signals accurately reflect the user's heart rate.
Implementation Method 1
a heart rate detection light signal, where the heart rate detection light signal is a light signal that is emitted upward from a ring light-emitting region of a display screen
Implementation Method 2
a light signal that is emitted upward from a ring light-emitting region of a display screen and enters a capturing region after being reflected by a finger of a user
Implementation Method 3
the absorption of light by blood changes due to the flow of blood in blood vessels, and a frequency of this change is related to a heart rate
Data Source
AI summary
A heart rate detection method, a heart rate detection apparatus and an electronic device are provided. The heart rate detection method includes: acquiring a heart rate detection light signal, where the heart rate detection light signal is a light signal that is emitted upward from a ring light-emitting region of a display screen and enters a capturing region after being reflected by a finger of a user, and an intermediate region surrounded by the ring light-emitting region is a non-light-emitting region (601); and determining a heart rate of the user according to the heart rate detection light signal (602). According to the method, the accuracy of heart rate detection could be effectively improved.