Under-Display Fingerprint Sensor Layout for Fill Factor and Cross-Talk
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Solution Overview
Problem
Existing electronic devices face challenges in optimizing the fill factor and field of view of fingerprint sensors while managing cross-talk components effectively, particularly when integrating fingerprint recognition into display layers.
Innovation Solution
The electronic device incorporates a biometric information sensing layer with an optical pattern layer and a display layer, where the fill factor of the sensor is optimized between 10% to 70% or 70% to 100%, achieving a field of view of 15° to 30° or 1° to 7°, respectively, with controlled cross-talk components, and includes a light collecting layer with a refractive layer and a cover layer to enhance light reception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the fill factor of the sensor is increased to improve light reception, then the amount of light received by the sensor increases, but the field of view decreases and cross-talk components increase
Solution Approach 1:
The patent optimizes the fill factor parameter to specific ranges (10-70% or 70-100%) to balance light reception with field of view and cross-talk control. By carefully selecting and adjusting this parameter, the system achieves optimal fingerprint recognition accuracy while maintaining sufficient light reception for sensor operation.
2Quantity of substance
If the field of view of the sensor is increased to capture more light, then the amount of light received increases, but cross-talk components increase reducing signal-to-noise ratio
Solution Approach 1:
The patent establishes specific parameter ranges for field of view (15-30 degrees or 1-7 degrees) that correspond to different fill factor configurations. By changing these optical parameters within defined ranges, the system maximizes light reception while controlling cross-talk to acceptable levels (1-10% or 1-5% proportion).
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
This configuration enhances the efficiency and accuracy of fingerprint recognition by optimizing light reception and reducing cross-talk, allowing for seamless integration with display layers without compromising image quality.
Implementation Method 1
an optical pattern layer disposed on the biometric information sensing layer, and including a plurality of transmission parts and a light shielding part
Implementation Method 2
a refractive layer disposed on the optical pattern layer, and including a lens array
Implementation Method 3
the refractive layer may include a lens array
Implementation Method 4
the cover layer may include an infrared filter
Implementation Method 5
a biometric information sensing layer including a sensor
Data Source
AI summary
Provided is an electronic device including: a biometric information sensing layer including a sensor; an optical pattern layer disposed on the biometric information sensing layer, and including a plurality of transmission parts and a light shielding part; and a display layer disposed on the optical pattern layer. When a fill factor (FF) of the sensor, which is a ratio of the amount of light received by the sensor to the total amount of light incident onto the sensor, is about 10% to about 70%, a field of view (FOV) of light incident onto the sensor is about 15° to about 30°.