Optical Fingerprint Detection via Signal Reflection
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Solution Overview
Problem
Fingerprint identification accuracy is compromised by environmental factors such as wetness, dryness, and low temperatures, leading to low recognition accuracy in biometric identification systems.
Innovation Solution
A display assembly with a signal transmitter and receiver is used to generate and detect a detection signal that penetrates and reflects off an object's identification surface, allowing for fingerprint identification without direct contact, thereby minimizing the impact of environmental factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional contact-based fingerprint identification is used, then the system is simple and easy to operate, but recognition accuracy is degraded by environmental factors such as wetness, dryness, and low temperature
Solution Approach 1:
The patent replaces the mechanical contact-based fingerprint sensing system with an optical detection system. A light source emits light that penetrates the fingerprint ridge and valley structures, and a sensor detects the reflected or transmitted light patterns. This optical substitution eliminates direct mechanical contact between the fingerprint and sensor, thereby preventing environmental factors like moisture, oil, and temperature from degrading recognition accuracy.
Solution Approach 2:
The patent introduces light as an intermediary medium between the fingerprint and the detection system. Instead of direct contact, light serves as the mediator that carries information about the fingerprint structure from the identification surface to the sensor. This intermediary approach allows non-contact detection, making the system immune to environmental contaminants that would otherwise interfere with direct contact sensing.
2Reliability
If non-contact optical detection is implemented, then environmental factor impact is reduced, but device complexity increases due to additional components
Solution Approach 1:
The patent integrates the light source and sensor into the existing display assembly structure, allowing the display to serve dual functions: visual output and fingerprint detection. The display panel itself acts as the identification surface, and the same structural components support both display functionality and biometric authentication. This multi-functionality approach reduces overall device complexity by eliminating dedicated separate components for each function.
Solution Approach 2:
The patent merges the fingerprint detection system with the display assembly by positioning the light source and sensor within the display structure. The identification area is formed as part of the display panel, combining what would traditionally be separate components into a unified integrated structure. This merging reduces the number of discrete parts and simplifies the overall device architecture while maintaining reliable non-contact detection capability.
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 method enhances fingerprint identification accuracy by refracting detection signals in ridge and valley regions, improving recognition rates even when the identification surface is dry or affected by environmental conditions.
Implementation Method 1
generate, in a direction of the object, a detection signal operable to penetrate the object and reflect a target signal representative of at least part of the identification surface on the identification area
Implementation Method 2
enhances fingerprint identification accuracy by refracting detection signals in ridge and valley regions
Data Source
AI summary
The present disclosure relates to a display assembly, a method of using the display assembly, and an electronic device, which uses the display assembly, for detecting an identification surface of an object (e.g., a fingerprint) using a detection signal, which penetrates the object and reflects a target signal representative of at least part of the identification surface (e.g., the orthographic projection of the fingerprint) onto an identification area on a display. A signal receiver (i.e., comprising a signal receiver) then detects the target signal. The target signal can be used by a processor to further authenticate whether it corresponds to an authorized user. The display assembly includes a display having an identification area, a signal transmitter (i.e., comprising a signal transmitter) configured to generate a detection signal when an object is within a preset distance of the identification area, and a signal receiver configured to detect the target signal.