Piezoelectric Ultrasonic Sensor Integrated in Display Panel
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Solution Overview
Problem
Existing ultrasonic gesture recognition systems face challenges with energy attenuation of ultrasonic waves during transmission through display panels, leading to reduced accuracy in gesture recognition.
Innovation Solution
The integration of an ultrasonic sensor within the display device, featuring a piezoelectric material layer and a third electrode layer, reduces energy attenuation by optimizing the transmission path of ultrasonic waves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If an ultrasonic sensor is directly attached to the back of the display panel and disposed independently, then the device structure is simplified, but the ultrasonic energy attenuates greatly during transmission through the entire display panel
Solution Approach 1:
The patent merges the ultrasonic sensor with the display panel by integrating the piezoelectric material layer between the pixel definition layer and the light-emitting unit layer, making the sensor an inherent part of the display structure rather than an external component, thereby reducing energy attenuation during ultrasonic wave transmission
Solution Approach 2:
The patent changes the spatial arrangement by disposing the piezoelectric material layer within the display panel's internal layers rather than attaching the sensor externally to the back, creating a more efficient transmission path through strategic layer positioning
2Ease of manufacture
If an ultrasonic sensor is directly attached to the back of the display panel, then the manufacturing process is simplified, but the accuracy of gesture recognition is reduced due to energy attenuation
Solution Approach 1:
The ultrasonic sensor is combined with the display panel manufacturing process by incorporating the piezoelectric material layer into the existing layer structure, maintaining manufacturing simplicity while significantly improving gesture recognition accuracy through reduced energy loss
3Loss of energy
If the piezoelectric material layer is disposed between the pixel definition layer and the light-emitting unit layer, then the ultrasonic transmission path is optimized, but the device structure becomes more complex
Solution Approach 1:
The piezoelectric material layer serves dual functions: it acts as part of the display panel structure and simultaneously functions as the ultrasonic sensor element, enabling optimized ultrasonic transmission without adding separate sensor components or increasing overall device complexity
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 enhances the accuracy of gesture recognition by minimizing energy loss during ultrasonic wave transmission, while also avoiding interference from ambient light conditions.
Implementation Method 1
an ultrasonic sensor comprising the second electrode layer, a piezoelectric material layer disposed between the first electrode layer and the pixel definition layer, and a third electrode layer disposed between the pixel definition layer and the resin layer
Data Source
AI summary
A display device, a method for producing a display device, and a gesture recognition method are disclosed. The display device includes a display module including a base and an array substrate, a resin layer, a first electrode layer, a pixel definition layer, a light-emitting unit layer, a second electrode layer disposed opposite to the first electrode layer, and an encapsulation layer. The light-emitting unit layer is between the first electrode layer and the second electrode layer and includes a plurality of light-emitting units respectively in a plurality of openings of the pixel definition layer, and an ultrasonic sensor including the second electrode layer, a piezoelectric material layer between the first electrode layer and the pixel definition layer, and a third electrode layer between the pixel definition layer and the resin layer. The piezoelectric material layer includes a plurality of piezoelectric material units separated by the plurality of light-emitting units.