Acoustic Lens Under-Screen Fingerprint Integration
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Solution Overview
Problem
Existing under-screen-based fingerprint identification solutions rely on acoustic wave-based technologies that require a layer attached to the backside of the display screen, limiting the need for new types of solutions that can integrate fingerprint recognition directly under the screen.
Innovation Solution
A fingerprint recognition structure incorporating an acoustic lens to reduce divergence angles of acoustic waves, an acoustic wave emitter at the focal position of the lens, and an acoustic wave receiver on the side of the lens, allowing for efficient emission and reception of acoustic waves for fingerprint detection, with specific configurations of piezoelectric materials and electrodes for enhanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If acoustic wave emitter is placed under the display screen for fingerprint recognition, then fingerprint identification function is integrated under-screen, but acoustic waves diverge and require complex timing for reception
Solution Approach 1:
An acoustic lens is introduced as an intermediary component between the acoustic wave emitter and the acoustic wave receiver. The lens focuses the divergent acoustic waves, converting them into directed waves that travel along a specific path. This intermediary structure simplifies the timing requirements for wave reception while enabling integrated under-screen fingerprint recognition functionality.
2Adaptability or versatility
If acoustic wave emitter is placed under the display screen, then under-screen fingerprint recognition is enabled, but acoustic waves spread out and reduce detection precision
Solution Approach 1:
The acoustic lens serves as a mediator that collects divergent acoustic waves from the emitter and refracts them into a focused beam. This focusing action concentrates the acoustic energy onto the fingerprint region, thereby maintaining high detection precision despite the under-screen emitter configuration.
Solution Approach 2:
The acoustic lens changes the propagation parameters of the acoustic waves by refracting them. Specifically, it transforms the divergent wavefront into a more directional wavefront, altering the spatial distribution and concentration of acoustic energy to improve fingerprint detection precision.
3Reliability
If traditional acoustic wave emitter and receiver configuration is used, then fingerprint recognition is possible, but the structure requires multiple layers attached to backside of display screen
Solution Approach 1:
The acoustic lens is integrated with the acoustic wave emitter and receiver into a unified under-screen structure. This merging of components eliminates the need for separate multi-layer attachments on the display backside, simplifying the overall device structure while maintaining reliable fingerprint recognition capability.
Solution Approach 2:
The acoustic lens serves multiple functions simultaneously: it focuses the acoustic waves from the emitter, directs them toward the receiver, and enables the entire system to function as an integrated under-screen fingerprint sensor. This multi-functionality reduces the need for additional separate components.
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
Enables effective under-screen fingerprint recognition by converting divergent acoustic waves into plane waves for synchronized reception, simplifying timing and improving flexibility in design, while allowing for smaller and more efficient acoustic wave emitters and receivers, thus enhancing fingerprint texture deduction.
Implementation Method 1
an acoustic lens configured to reduce a divergence angle of acoustic waves
Implementation Method 2
the acoustic wave emitter is a point acoustic source... the point acoustic source includes a third electrode, a second piezoelectric material layer, and a fourth electrode sequentially stacked
Data Source
AI summary
The present disclosure provides a fingerprint identification structure and a display device. The fingerprint identification structure includes an acoustic wave emitter, a focus acoustic lens, and a sound wave receiver. The acoustic lens are between the acoustic wave emitter and the sound wave receiver, the acoustic wave emitter is at a focal position of the acoustic lens and configured to emit acoustic wave toward the acoustic lens, the acoustic wave receiver is configured to detect the intensity distribution of the acoustic wave emitted by the acoustic wave emitter after the acoustic wave sequentially passes through the acoustic lens and the acoustic wave receiver, reaches the surface of the finger and is reflected back by the surface of the finger. The fingerprint recognition structure improves design flexibility.