Flexible Display Panel With Switchable Stiffness for Repeated Bending
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Solution Overview
Problem
Flexible display panels require a support layer with high hardness to maintain flatness when unfolded, which compromises their bending performance and leads to potential breakage from repeated bending.
Innovation Solution
A flexible display panel design with upper and lower layer groups that include target layers with adjustable stiffness and elastic modulus, switching between ranges based on trigger conditions such as force or temperature, using smart materials like pseudoplastic fluids and heating elements to manage bending and unfolding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a support layer with high hardness is used to maintain flatness when unfolded, then flatness is improved, but bending performance deteriorates leading to potential breakage
Solution Approach 1:
The patent applies a pseudoplastic fluid material in the support layer that dynamically changes its viscosity based on applied stress. When bent, the material's viscosity decreases allowing flexible deformation; when unfolded, viscosity increases to maintain flatness and structural support, thus resolving the contradiction between flatness and bending performance
Solution Approach 2:
The patent changes the physical parameter (viscosity) of the support layer material based on operational conditions. The pseudoplastic fluid's viscosity is high in the unfolded state to maintain flatness, and low in the bent state to enable flexible deformation without breakage, directly addressing the flatness-bending performance contradiction
2Shape
If a support layer with high hardness is used to maintain flatness, then flatness is improved, but the panel becomes prone to breakage after repeated bending
Solution Approach 1:
The pseudoplastic fluid material provides dynamic viscosity adjustment that protects the panel during repeated bending cycles. High viscosity in the unfolded state maintains flatness and structural integrity, while low viscosity during bending allows stress dissipation, preventing crack formation and cumulative damage from repeated flexing
Solution Approach 2:
The patent incorporates the pseudoplastic fluid material as a cushioning layer that anticipates bending stresses. Before bending occurs, the material is in a high-viscosity state providing structural support; during bending, it transitions to low-viscosity state to cushion and distribute stresses, preventing breakage before it can occur
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
Enhances bending performance by reducing stress and deformation, allowing repeated bending without breakage, while maintaining flatness and display quality.
Implementation Method 1
the at least one target layer includes a pseudoplastic fluid material
Implementation Method 2
the temperature adjustment device includes a heating element for heating the at least partial region of the at least one target layer
Data Source
AI summary
One or more embodiments of the present application relate to a flexible display panel and a display apparatus, the flexible display panel includes a display layer, an upper layer group located above the display layer, and a lower layer group located below the display layer. The upper layer group includes at least one layer. The lower layer group includes at least one layer. The at least one layer of the upper layer group and/or the at least one layer of the lower layer group comprises at least one target layer. In response to a trigger condition, a characteristic parameter of at least partial region of the at least one target layer in the upper layer group and/or the lower layer group switches between a first range and a second range, and a minimum value in the second range is greater than a maximum value in the first range.