Fingerprint Recognition Panel With Total Reflection Light Routing
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Solution Overview
Problem
Current fingerprint identification technologies in display panels face interference issues between adjacent light emitting elements, leading to inefficient and time-consuming fingerprint collection processes due to overlapping effective radiation ranges, which complicates the determination of clear fingerprint edges.
Innovation Solution
A fingerprint identification panel is designed with a dielectric layer between the encapsulation layer and light sensing elements, having a refractive index lower than the encapsulation layer, allowing for non-overlapping effective radiation ranges and enabling simultaneous emission of light from all elements, with a driving circuit controlling light emission and determining fingerprint morphology.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a separate fingerprint recognition module is added to a touch panel, then fingerprint recognition function is achieved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent merges the fingerprint recognition module with the touch sensor module into a single integrated structure. The fingerprint recognition module includes ridges and valleys that form conductive patterns, while the touch sensor module has sensing electrodes positioned at the same location. This integration eliminates the need for separate modules and reduces overall device complexity.
Solution Approach 2:
The integrated module serves multiple functions simultaneously: it acts as both a touch sensor for detecting touch events and a fingerprint recognition module for biometric authentication. The conductive patterns formed by the ridges and valleys of the fingerprint module double as sensing electrodes for touch detection, achieving multi-functionality with a single component.
2Adaptability or versatility
If a separate fingerprint recognition module is added to a touch panel, then fingerprint recognition function is achieved, but manufacturing precision requirements increase
Solution Approach 1:
By combining the fingerprint recognition module and touch sensor module into one integrated component, the patent reduces the number of assembly steps and alignment requirements. The conductive patterns are formed directly during the module fabrication process rather than requiring separate assembly of multiple modules, thereby reducing manufacturing precision requirements.
3Ease of manufacture
If conventional touch panel structures are used without integration, then manufacturing is easier, but touch sensitivity and fingerprint recognition accuracy decrease
Solution Approach 1:
The integration allows the sensing electrodes of the touch sensor to be positioned exactly at the fingerprint ridges and valleys, maximizing touch sensitivity while maintaining ease of manufacture through a unified fabrication process.
Solution Approach 2:
The patent applies different patterns of conductive material to different regions of the module, with the pattern following the fingerprint ridge and valley structure. This local variation in conductive pattern placement optimizes both touch sensitivity at specific locations and fingerprint recognition accuracy while maintaining manufacturability.
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 improves the efficiency and precision of fingerprint identification by allowing all light emitting elements to emit light simultaneously, reducing interference and enabling clear fingerprint edge detection, thus shortening the identification process.
Implementation Method 1
the encapsulation layer is configured to enable light emitted from the plurality of light emitting elements to be totally reflected in the encapsulation layer
Implementation Method 2
the dielectric layer is configured to enable light totally reflected by the encapsulation layer to be received by the light sensing element after passing through the dielectric layer, and a refractive index of the dielectric layer is smaller than a refractive index of the encapsulation layer
Data Source
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AI summary
The disclosure provides a fingerprint identification panel. The fingerprint identification panel includes an encapsulation layer, a light emitting element, a light sensing element and a dielectric layer. The encapsulation layer is on a same side of the light emitting element and the light sensing element and is in direct contact with the dielectric layer, and the encapsulation layer is configured to enable light emitted from the light emitting element to be totally reflected after passing through the encapsulation layer; the dielectric layer is between the encapsulation layer and the light sensing element, and is configured to enable the light totally reflected by the encapsulation layer to be received by the light sensing element after passing through the dielectric layer, and a refractive index of the dielectric layer is smaller than that of the encapsulation layer.