Piezoelectric Sensor for Flexible Display Deformation Detection
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Solution Overview
Problem
Current flexible AMOLED display devices cannot detect stress changes during deformation, making it difficult to determine bending degree and preventing the development of new functions based on bending capabilities.
Innovation Solution
Incorporating a piezoelectric sensor with a first and second electrode and a piezoelectric layer, such as polyvinylidene fluoride (PVDF), between the flexible substrate and display device to generate electrical signals upon bending, allowing for deformation parameter determination and enabling new operational functions based on bending positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible AMOLED display device is made bendable, then adaptability and versatility are improved, but the ability to detect stress changes during deformation deteriorates
Solution Approach 1:
A piezoelectric sensor layer is introduced as an intermediary component between the flexible substrate and the display device. This sensor layer contains piezoelectric material that converts mechanical stress from bending into electrical signals, enabling stress detection without compromising the flexible display's bending capability. The sensor acts as a mediator that transforms physical deformation into detectable electrical information.
2Measurement precision
If piezoelectric sensor is added to detect deformation, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The piezoelectric sensor is implemented as a thin film layer integrated into the flexible display structure. This thin-film approach maintains the overall flexibility and simplicity of the device while providing accurate deformation detection. The sensor layer is deposited or laminated onto the flexible substrate, avoiding complex rigid sensor assemblies that would increase device complexity.
3Adaptability or versatility
If piezoelectric layer material is selected for flexibility, then adaptability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The piezoelectric sensor utilizes a composite structure combining flexible substrate material with piezoelectric material layers. This composite approach allows the sensor to maintain flexibility while providing sufficient piezoelectric effect for accurate detection. The combination of materials is designed to work together, where the flexible substrate provides mechanical compliance and the piezoelectric layer provides sensing functionality, reducing the precision requirements for individual material deposition.
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 accurate detection of deformation parameters, preventing excessive bending and allowing for enhanced user interaction and functionality in flexible display devices by converting bending into electrical signals for signal processing.
Implementation Method 1
a piezoelectric sensor positioned on one side of the flexible substrate, wherein the piezoelectric sensor includes: a first electrode, a second electrode, and a piezoelectric layer positioned between the first electrode and the second electrode; the piezoelectric sensor is configured to generate an electrical signal under the action of stress produced by bending the flexible display panel
Data Source
AI summary
Disclosed are a flexible display panel, a flexible display device and a deformation detection method thereof, used for detecting deformation of the flexible display panel. The flexible display panel provided by embodiments of the present disclosure includes a flexible substrate, a display device and a piezoelectric sensor arranged in a stacked mode. The piezoelectric sensor includes a first electrode, a second electrode, and a piezoelectric layer positioned between the first electrode and the second electrode; the piezoelectric sensor is configured to generate an electrical signal under the action of stress produced by bending the flexible display panel; and a signal processing chip in the flexible display device is configured to determine deformation parameters of the flexible display panel according to the electrical signal.