Iris Sensor Proximity Control for Eye Safety
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Solution Overview
Problem
Portable terminals with iris sensors face issues of eye fatigue and damage due to high-intensity light output, which can occur when the iris sensor is activated at close distances, potentially harming the user's eyes.
Innovation Solution
An electronic device equipped with a proximity sensor that determines the distance between the device and an object, activating the iris sensor only when the distance is greater than a reference value and deactivating it when the distance is less than or equal to that value to prevent eye damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the iris sensor uses high-power IR LED to accurately recognize the iris, then the recognition accuracy is improved, but the light intensity increases causing negative influence on user's eyes
Solution Approach 1:
The patent changes the operating parameters of the iris sensor by adjusting the power output of the IR LED based on detection distance. When an object is detected within a predetermined distance, the sensor reduces or stops light output, thereby changing the light intensity parameter to prevent eye damage while maintaining recognition accuracy at safe distances
Solution Approach 2:
The patent implements dynamic control of the iris sensor's light output based on real-time distance detection. The sensor continuously monitors object distance and dynamically adjusts its operation mode (high power for distant objects, low power or off for close objects), making the system adaptable to prevent eye damage while maintaining recognition functionality
2Reliability
If the iris sensor is activated continuously for security recognition, then the security function is improved, but the risk of eye exposure to high-intensity light increases
Solution Approach 1:
The patent implements dynamic control of the iris sensor's light output based on real-time distance detection. The sensor continuously monitors object distance and dynamically adjusts its operation mode (high power for distant objects, low power or off for close objects), making the system adaptable to prevent eye damage while maintaining recognition functionality
Solution Approach 2:
The patent uses feedback from distance detection to control iris sensor operation. The system continuously monitors the distance between the sensor and detected objects, and based on this feedback information, automatically adjusts whether to activate the high-power IR LED, thereby preventing eye damage while maintaining security recognition
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
Prevents eye fatigue and damage by ensuring the iris sensor is only active at safe distances, thereby protecting the user's eyes from excessive light exposure.
Implementation Method 1
the portable terminal may irradiate light to the object using an infrared (IR) LED and use the amount of light reflected from the object
Implementation Method 2
an iris sensor configured to detect an iris
Data Source
AI summary
An electronic device according to one example of the present invention comprises: a proximity sensor for generating proximity information on an object which approaches the electronic device; an iris sensor for detecting an iris; and a first processor for controlling the electronic device, wherein the first processor can be set to: determine the distance between the electronic device and the object on the basis of the proximity information generated by the proximity sensor; detect the iris by using the iris sensor when the distance between the electronic device and the object is greater than a first reference value; and inactivate the iris sensor when the distance between the electronic device and the object is less than or equal to the first reference value. In addition, other examples are possible.