Flexible Display Panel Deformation Detection Using Piezoelectric Layers
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Solution Overview
Problem
Flexible display panels experience poor display effects when bent due to bending stress, which complicates image compensation as deformation varies by position without known compensation coefficients, necessitating accurate deformation measurement in the bending region.
Innovation Solution
Incorporating deformation detection units with a piezoelectric material layer between electrodes in the bending region of flexible display panels to measure deformation amounts, enabling precise compensation and improved display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If image compensation is implemented in the bending region, then display quality is improved, but the system cannot accurately measure deformation amounts without known compensation coefficients
Solution Approach 1:
The flexible display panel performs self-detection of deformation amounts using integrated piezoelectric material layers that generate electrical signals in response to mechanical stress during bending. This self-service mechanism eliminates the need for external detection devices while enabling accurate measurement of deformation at different positions in the bending region.
Solution Approach 2:
The piezoelectric material layer serves multiple functions: it acts as both a structural component of the display panel and a sensing element for deformation detection. This multi-functionality reduces device complexity by combining detection capabilities within the existing panel structure rather than adding separate detection systems.
2Measurement precision
If deformation detection units are added to measure deformation at each position, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The deformation detection functionality is merged with the existing display panel structure by integrating piezoelectric material layers between the substrate and the functional layers. This combining approach allows deformation detection without adding separate detection units, thereby improving measurement precision while minimizing increases in device complexity.
Solution Approach 2:
The piezoelectric material is implemented as a thin film layer that conforms to the flexible nature of the display panel. This thin-film integration enables deformation sensing throughout the bending region without adding significant structural complexity or rigid components that would compromise panel flexibility.
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
Accurate deformation measurement allows for effective luminance compensation, enhancing the display effect of flexible display panels by accounting for varying deformation across the bending region.
Implementation Method 1
Each deformation detection unit includes a first electrode, a piezoelectric material function layer and a second electrode, which are sequentially stacked along a direction perpendicular to a light-emitting surface of the flexible display panel
Data Source
AI summary
A flexible display panel and a flexible display device are described. The flexible display panel includes a bending region, a non-bending region. A number of deformation detection units are disposed in the bending region. The deformation detection units each includes a first electrode, a piezoelectric (PZT) material function layer and a second electrode which are sequentially stacked in a direction perpendicular to a light-emitting surface of the flexible display panel. The density of the PZT units and PZT function layer thickness may vary depending on their distance from the bending axis.