Ultrasonic Fingerprint Sensor Acoustics Configuration Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Ultrasonic fingerprint sensors in flexible displays face challenges with reduced thickness, leading to compromised rigidity and potential damage when compressed by user interaction, affecting signal strength and integrity.
Innovation Solution
Incorporating an acoustics configuration layer between the flexible display and the ultrasonic fingerprint sensor, optimized to enhance signal strength and operational frequency, and using a resonating material to alter the frequency range, while maintaining structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flexible display thickness is reduced to achieve flexibility, then the device becomes more flexible and portable, but the rigidity is compromised and the sensor may be damaged when compressed
Solution Approach 1:
The display structure is divided into multiple functional layers including a flexible display layer, an acoustics configuration layer, and a support layer. Each layer performs a specific function: the flexible display layer provides flexibility, the acoustics configuration layer optimizes ultrasonic signal transmission, and the support layer provides structural rigidity and compression resistance to protect the sensor.
Solution Approach 2:
The patent employs composite material structures combining different materials with complementary properties. The acoustics configuration layer uses resonating material to enhance ultrasonic signal transmission, while the support layer uses rigid material to provide structural strength. This composite approach allows the display to simultaneously achieve flexibility and protection against compression damage.
2Adaptability or versatility
If the display layers are made thinner to maintain flexibility, then the overall device thickness is reduced, but the signal strength of the ultrasonic fingerprint sensor is compromised
Solution Approach 1:
The acoustics configuration layer acts as an intermediary between the flexible display layer and the ultrasonic fingerprint sensor. This intermediate layer is specifically designed to optimize the transmission of ultrasonic signals, compensating for the reduced thickness of the flexible display by enhancing acoustic coupling and signal strength.
Solution Approach 2:
The acoustics configuration layer is designed with specific acoustic parameters including resonant frequency matching and acoustic impedance optimization. By carefully selecting the material properties and thickness of this layer, the system maintains effective ultrasonic signal transmission despite the reduced overall display thickness.
3Area of stationary object
If the sensor is positioned closer to the display to reduce distance, then the scanning area is increased, but the structural integrity is compromised when compressed by user interaction
Solution Approach 1:
The support structure is segmented into multiple layers with the ultrasonic fingerprint sensor positioned within a recess of the support layer. This segmentation allows the sensor to be close to the display for maximum scanning area while the support layer provides structural protection against compression from user interaction.
Solution Approach 2:
The support layer is designed beforehand to cushion and absorb compression forces from user interaction. This protective layer is positioned to shield the ultrasonic fingerprint sensor from direct compression, preventing damage while allowing the sensor to maintain its position for optimal scanning performance.
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
The solution enables improved fingerprint scanning accuracy and increased scanning area without damaging the sensor or display, ensuring reliable user authentication.
Implementation Method 1
an ultrasonic fingerprint sensor that is configured to transmit and receive an ultrasonic signal in an acoustic path through the flexible display
Implementation Method 2
an acoustics configuration layer formed of a resonating material, wherein the acoustics configuration layer is configured to optimize an operational frequency of an ultrasonic signal
Data Source
AI summary
Various aspects of the present disclosure relate generally to ultrasonic fingerprint sensor. In some aspects, a device may include a flexible display. The device may include an ultrasonic fingerprint sensor that is configured to transmit and receive an ultrasonic signal in an acoustic path through the flexible display. The device may include an acoustics configuration layer that is situated between the display and the ultrasonic fingerprint sensor. The acoustics configuration layer may be configured to optimize a signal strength of the ultrasonic signal based at least in part on a configuration of one or more layers of the flexible display. Numerous other aspects are provided.