Flexible Display Back Plate Framework for Ripple Reduction
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Solution Overview
Problem
Flexible foldable display devices face a ripple phenomenon due to deformation and pressure on the back plate during folding, which affects the adjacent layers.
Innovation Solution
A back plate design featuring a flexible layer with a framework layer made of a polymer material and a filling layer embedded between framework strips, where the framework strips are arranged to form a grid structure with varying gaps between them, providing a higher elastic modulus for support and flexibility for bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid back plate is used to provide support strength, then the support strength is improved, but the back plate cannot be bent and causes ripple phenomenon during folding
Solution Approach 1:
The back plate is divided into a framework layer with multiple framework strips spaced apart, creating a segmented structure. This segmentation allows the back plate to bend while maintaining support strength, as the individual framework strips can flex independently without causing ripple phenomena in adjacent layers.
Solution Approach 2:
The back plate uses a composite structure combining a flexible layer (such as polyimide) with a framework layer made of polymer materials. This composite design provides both the flexibility needed for bending and the structural support required to prevent deformation, resolving the contradiction between rigidity and flexibility.
2Strength
If the framework strips are arranged closely to increase support strength, then the support strength is improved, but the bending flexibility is reduced
Solution Approach 1:
The framework strips are arranged with varying spacing to create different local properties: in bending areas, the framework strips are spaced farther apart to allow flexibility, while in non-bending areas, they are spaced closer together to provide stronger support. This local variation in spacing optimizes both support strength and bending flexibility in different regions of the back plate.
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
The design allows for oriented bending of the back plate, reducing the ripple phenomenon by distributing pressure and enhancing support strength, while maintaining flexibility and reducing deformation during the folding process.
Implementation Method 1
an elastic modulus of the framework layer is greater than an elastic modulus of the filling layer, and an elastic modulus of the flexible layer is smaller than an elastic modulus of the framework layer
Data Source
AI summary
The present invention provides a display device and a back plate thereof, including: a flexible layer having a first surface and a second surface opposite to each other; a framework layer disposed on the first surface, and including at least two framework strips which are spaced apart from each other, wherein the framework layer is made of a material including a polymer; and a filling layer covering a side of the framework layer away from the flexible layer, and embedded in a gap between adjacent ones of the framework strips.