In-Panel Ultrasonic Fingerprint Sensor Integration
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Solution Overview
Problem
Current ultrasonic fingerprint recognition integration solutions for OLED screens are costly and increase screen thickness, compromising user comfort due to the external placement of the ultrasonic fingerprint module.
Innovation Solution
Integration of a fingerprint recognition sensor within the display panel, comprising a piezoelectric layer, electrodes, and a driving circuit, allowing for in-panel ultrasonic fingerprint recognition without the need for external modules, thereby reducing thickness and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an ultrasonic fingerprint module is placed outside the OLED screen, then fingerprint recognition function is achieved, but screen thickness increases and manufacturing cost increases
Solution Approach 1:
The patent combines the ultrasonic fingerprint sensing function with the OLED display structure by integrating the fingerprint sensor between the OLED panel and the touch panel, eliminating the need for external fingerprint modules and reducing overall screen thickness while maintaining fingerprint recognition capability
Solution Approach 2:
The patent makes the OLED screen structure multi-functional by incorporating both display and fingerprint recognition functions into a single integrated structure, where the space between OLED and touch panel serves dual purposes: optical transmission for display and acoustic wave transmission for fingerprint sensing
2Reliability
If an ultrasonic fingerprint module is placed outside the OLED screen, then fingerprint recognition function is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the fingerprint sensor with existing OLED and touch panel components, utilizing the space and structural elements already present in the display assembly, thereby eliminating the need for separate external fingerprint module procurement and assembly, which reduces manufacturing cost
Solution Approach 2:
The patent enables the OLED screen structure to serve its own fingerprint sensing function using existing components such as the touch panel and adhesive layers, eliminating the need for additional dedicated fingerprint module components and reducing overall manufacturing cost
3Reliability
If an external ultrasonic fingerprint module is used, then fingerprint recognition is achieved, but user comfort decreases
Solution Approach 1:
The patent integrates the fingerprint sensor within the display panel structure, making the fingerprint recognition function invisible and seamless to users, which improves aesthetic appearance and user comfort by eliminating external protrusions or separate fingerprint modules
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 integration results in a thinner, lighter mobile terminal with improved user comfort and enhanced security, as the fingerprint recognition is performed internally within the display panel, eliminating the need for external modules and adhesive layers.
Implementation Method 1
the fingerprint recognition sensor comprises a piezoelectric layer, a plurality of first electrodes disposed on a side of the piezoelectric layer
Implementation Method 2
Ultrasonic waves are absorbed, penetrated, and reflected differently when they reach a surface of different materials. Therefore, the difference in acoustic impedance between skin and air or different skin layers can be used to identify a location of fingerprint ridges and valleys
Data Source
AI summary
A display panel and a mobile terminal are provided. The display panel includes a driving circuit layer, a fingerprint recognition sensor, and a light emitting device layer. The fingerprint recognition sensor is disposed on a side of the driving circuit layer, and the fingerprint recognition sensor is an ultrasonic sensor. The light emitting device layer is arranged on a side of the fingerprint recognition sensor away from the driving circuit layer.