Mobile Terminal Iris Recognition Sensor Layout and Low Power Image Sensor
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Solution Overview
Problem
Mobile terminals face challenges in enhancing security and reducing power consumption while implementing iris recognition, particularly in improving the field of view and user convenience of iris recognition sensors, and optimizing power usage in image sensing.
Innovation Solution
A mobile terminal design incorporating an infrared unit for iris recognition and a low power image sensor with a wide field of view, allowing for convenient iris recognition and reduced power consumption by using a low power image sensor to detect face images even in an inactive display state, and controlling the display unit to output specific information only when a face is detected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an iris recognition sensor is implemented in a mobile terminal, then security is enhanced, but the field of view is limited and user convenience is reduced
Solution Approach 1:
The patent divides the sensing function into two separate sensors: an iris recognition sensor for security authentication and a low power image sensor for field of view expansion and user guidance. This segmentation allows each sensor to be optimized for its specific function, resolving the contradiction between security enhancement and user convenience.
Solution Approach 2:
The low power image sensor serves multiple functions: expanding the field of view, detecting user presence, guiding user positioning, and enabling always-on display functionality. This multi-functionality addresses the convenience limitations while maintaining the security function of the iris recognition sensor.
2Reliability
If an iris recognition sensor is implemented in a mobile terminal, then security is enhanced, but the field of view is narrow
Solution Approach 1:
The patent separates the field of view function from the iris recognition sensor by introducing a dedicated low power image sensor with a wider field of view. This segmentation resolves the contradiction by allowing the iris recognition sensor to maintain its security function while the image sensor provides the expanded field of view.
Solution Approach 2:
The low power image sensor acts as an intermediary between the user and the iris recognition sensor. It detects user presence and guides positioning, enabling the iris recognition sensor to operate effectively without requiring it to have a wide field of view itself.
3Measurement precision
If a standard image sensor is used for face detection, then detection accuracy is improved, but power consumption increases
Solution Approach 1:
The patent employs a low power image sensor that consumes minimal energy (e.g., less than 100 µA) for continuous face detection operations. This sensor is optimized for low-power operation rather than high-performance imaging, appropriately matching the detection requirements with energy-efficient technology.
Solution Approach 2:
The system uses the low power image sensor for continuous monitoring in an inactive state, and only activates the main display and higher-power processing when a face is detected. This periodic activation pattern reduces overall power consumption while maintaining detection accuracy.
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 enhances user convenience by guiding the user to the correct position for iris recognition and reduces power consumption by selectively outputting information only when a face is detected, thereby improving the efficiency and usability of iris recognition in mobile terminals.
Implementation Method 1
an infrared unit configured to output infrared ray toward a subject
Implementation Method 2
an iris recognition sensor configured to receive reflected ray that the infrared ray output from the infrared unit is reflected from the subject
Data Source
AI summary
A mobile terminal including a main body; a receiver disposed on the main body; an infrared unit disposed on the main body at a first distance from the receiver in a first direction and configured to output infrared rays; an iris recognition sensor disposed on the main body at a second distance from the receiver in a second direction opposite the first direction and configured to receive infrared rays reflected from a subject; and a low power image sensor disposed on the main body at a third distance from the receiver in the second direction and having a focal point matching a focal point of the iris recognition sensor, wherein the third distance is greater than the second distance.