Palm Biometric Sensor Layer Under Display for Position Tolerance
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Solution Overview
Problem
Current contactless biometric identification systems are inconvenient due to the requirement for steady and accurate hand positioning, leading to an unpleasant user experience when the system fails due to improper hand placement.
Innovation Solution
An electronic device with a palm biometric image sensor layer beneath a display layer, using light transmissive and non-transmissive portions, and a controller to capture image data from a user's palm, determine surface distortion, and perform biometric authentication based on image data, orientation offset, and palm vein data, allowing for motion and inaccuracies in palm placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contactless biometric identification systems require steady and accurate hand positioning, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The system dynamically adjusts the sensing zone boundaries and authentication parameters based on the detected palm position and motion characteristics. The controller continuously adapts the region of interest and authentication thresholds during the sensing process, allowing the system to maintain measurement precision while accommodating natural hand movements and positioning variations.
Solution Approach 2:
The system changes operational parameters such as the sensing zone size, light source intensity, and authentication criteria based on the detected palm position and motion state. By adjusting these parameters dynamically, the system maintains authentication accuracy while being more tolerant of imperfect hand placement, thereby improving ease of operation.
2Measurement precision
If the system requires accurate palm placement, then biometric authentication accuracy is improved, but device complexity increases
Solution Approach 1:
The display layer serves multiple functions: it acts as both the user interface display and the protective cover for the biometric sensor, while also potentially serving as a light guide or diffuser for the illumination system. This multi-functionality reduces the need for separate protective windows or additional optical components, thereby reducing device complexity while maintaining authentication accuracy.
Solution Approach 2:
The system automatically detects palm position, adjusts sensing parameters, and guides the user through the authentication process without requiring manual intervention or complex external control mechanisms. The controller self-adjusts the authentication criteria based on the detected palm characteristics and motion patterns, reducing the need for additional sensors or complex control systems.
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
Enhances accuracy and convenience in palm biometric sensing and authentication by enabling motion and inaccuracies in palm placement, providing a more user-friendly experience.
Implementation Method 1
a photodiode layer on the substrate
Implementation Method 2
an infrared light source, and the controller may be configured to determine palm vein data from the image data resulting from the infrared light source
Data Source
AI summary
An electronic device may include a display layer including light transmissive portions and non-transmissive portions. The electronic device may also include a palm biometric image sensor layer beneath the display layer and configured to sense an image of a user's palm positioned above the display layer based upon light reflected from the user's palm passing through the light transmissive portions of the display layer. The electronic device may further include a controller configured to capture image data from the user's palm in cooperation with the palm biometric image sensor layer and determine a surface distortion of the user's palm based upon the image data. The controller may also be configured to perform a biometric authentication of the user's palm based upon the image data and the surface distortion.