OLED Display Panel Ultrasonic Fingerprint Signal Integrity
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Solution Overview
Problem
Traditional OLED display panel modules face issues with poor signal anti-interference and strong signal attenuation during ultrasonic fingerprint recognition, leading to lower recognition success rates due to the use of optical fingerprint unlocking methods.
Innovation Solution
An OLED display panel module is designed with an ultrasonic fingerprint recognition module, a sound absorbing layer, and specific adhesive agents to enhance signal transmission efficiency, featuring a cover plate, circular polarizer, and a solid optically clear adhesive, along with a sound absorbing tile material and foam layers to improve signal integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical fingerprint unlocking is used, then unlocking function is provided, but security is insufficient and cannot distinguish biological living bodies
Solution Approach 1:
The patent replaces the optical fingerprint recognition system with an ultrasonic fingerprint recognition system. The ultrasonic sensor emits ultrasonic waves that interact with the fingerprint ridges and valleys, using acoustic wave propagation and reflection principles to capture fingerprint patterns. This mechanical/acoustic approach provides better security by detecting living body characteristics through ultrasonic wave interaction, preventing spoofing by non-living materials.
2Reliability
If screen fingerprint recognition technology is used, then fingerprint recognition is enabled, but signal anti-interference is poor and attenuation during signal propagation is strong
Solution Approach 1:
The patent introduces a sound absorbing layer as an intermediary between the ultrasonic sensor and the external environment. This layer selectively absorbs interfering ultrasonic waves from surrounding areas while allowing the fingerprint-related ultrasonic signals to pass through to the sensor. The sound absorbing material acts as a mediator that filters out harmful interference signals, improving signal quality and recognition accuracy.
3Reliability
If screen fingerprint recognition technology is used, then fingerprint recognition is enabled, but recognition success rate is affected due to strong signal attenuation
Solution Approach 1:
The patent extracts and removes the sound absorbing layer from the general display structure and specifically positions it around the ultrasonic sensor area. This targeted placement ensures that only the necessary ultrasonic signals reach the sensor while unnecessary interfering signals are absorbed. The sound absorbing layer is strategically extracted and positioned to minimize signal attenuation of useful fingerprint signals while blocking interference.
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 significantly enhances the signal anti-interference ability and transmission efficiency of the ultrasonic fingerprint recognition module, improving the recognition success rate by filtering out interference and attenuating unnecessary ultrasonic waves.
Implementation Method 1
A sound absorbing layer is disposed on both sides of the OLED display panel module, both sides of the ultrasonic fingerprint recognition module, and the second region of the lower surface of the OLED display panel
Implementation Method 2
the ultrasonic recognition sensor is capable of transmitting ultrasonic waves at a certain frequency
Data Source
AI summary
An organic light emitting diode (OLED) display panel module includes a cover plate, a first adhesive agent, a circular polarizer, an OLED display panel, and an ultrasonic fingerprint recognition module. The ultrasonic fingerprint recognition module is disposed at a lower surface of the OLED display panel. Both sides of the OLED display panel module are provided with a sound absorbing layer, both sides of the ultrasonic fingerprint recognition module are provided with the sound absorbing layer, and a portion of the lower surface of the OLED display panel not contacted the ultrasonic fingerprint recognition module is provided with the sound absorbing layer.