Under-Display Ultrasonic Fingerprint and Speaker Integration
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Solution Overview
Problem
The integration of ultrasonic fingerprint recognition sensors and speakers under the screen of smart electronic products is hindered by space constraints and the need for separate components, limiting user convenience and efficiency.
Innovation Solution
A combined ultrasonic fingerprint recognition and speaker module is integrated with a display device, utilizing a common electrode layer to enable both fingerprint recognition and sound output, with a structure that includes piezoelectric film layers and connection layers to facilitate simultaneous functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate ultrasonic fingerprint recognition sensor and speaker modules are installed under the screen, then both functions can be achieved, but the device thickness increases and space is wasted
Solution Approach 1:
The patent combines the ultrasonic fingerprint recognition sensor module and the speaker module into a single integrated structure. The sensor module includes a first piezoelectric film layer for fingerprint recognition, while the speaker module includes a second piezoelectric film layer for sound output. Both modules share common components including the common electrode layer, connection layers, and substrate, thereby reducing overall device thickness and eliminating the need for separate component installations.
Solution Approach 2:
The integrated module serves multiple functions simultaneously: the first piezoelectric film layer performs ultrasonic fingerprint recognition when connected to the first electrode layer, while the second piezoelectric film layer performs speaker function when connected to the second electrode layer. The common electrode layer and substrate serve both modules, enabling multi-functionality within a single compact structure that reduces device thickness.
2Ease of manufacture
If separate components are used for fingerprint recognition and speaker functions, then each component can be optimized independently, but the complexity of assembly and space utilization deteriorates
Solution Approach 1:
The patent merges the fingerprint sensor and speaker into a single integrated module that can be installed as one unit under the display. The common electrode layer, connection layers, and substrate are shared between both functions, simplifying the assembly process compared to installing separate components. The integrated structure eliminates the need for separate mounting procedures while maintaining independent functionality of each component.
3Reliability
If ultrasonic fingerprint recognition sensor is installed under the screen, then fingerprint recognition with strong penetrability is achieved, but the available space for other components is reduced
Solution Approach 1:
The patent combines the ultrasonic fingerprint recognition sensor and speaker module into a single integrated unit that occupies less space than separate installations would require. The shared common electrode layer, connection layers, and substrate reduce the total area needed under the display, while maintaining the full fingerprint recognition capability through the first piezoelectric film layer.
Solution Approach 2:
The integrated module provides multiple functions within a compact footprint. The common electrode layer and substrate serve both the fingerprint sensor and speaker, maximizing space utilization under the display while maintaining reliable ultrasonic fingerprint recognition through the first piezoelectric film layer connected to the first electrode layer.
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 solution allows for reduced thickness and enhanced user convenience by enabling fingerprint recognition at any position on the display surface while providing sound output, addressing the limitations of separate component installation and space constraints.
Implementation Method 1
When there is a voltage difference between the first electrode layer and the common electrode layer, the first piezoelectric film layer will act and have a fingerprint recognition function
Implementation Method 2
When the common electrode layer and the second electrode layer have a voltage difference between them, the second piezoelectric film layer will work and have a speaker function
Implementation Method 3
when the finger touches the sensor, the sensor emits ultrasonic waves to the finger, and a 3D image is constructed using the ultrasonic waves
Data Source
AI summary
The present invention is a display device, comprising a display module, a fingerprint recognition module and a speaker module. The back of the display module is provided with a fingerprint recognition module and a speaker module. A common electrode layer is arranged between the fingerprint recognition module and the speaker module, so that the thickness of the display can be greatly reduced.