Multi-Layer CFRP Plate for Foldable Display Bending
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Solution Overview
Problem
Current foldable display devices face challenges in achieving both ease of folding and improved display quality, particularly in maintaining structural integrity and optical performance when bent.
Innovation Solution
A display device design incorporating a multi-layered plate with carbon fiber reinforced plastic (CFRP) layers, where the first and third layers have a fiber area weight of 20-30 g/m2 and 100-150 g/m2 respectively, and a thickness of 30-40 μm and 90-150 μm, respectively, with the second layer's thickness being 90-150 μm, arranged such that the elastic modulus is higher in the direction parallel to the folding axis, allowing for easier bending while maintaining support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer plate structure is used, then the device structure is simple, but the bending stiffness and display quality are insufficient
Solution Approach 1:
The patent applies composite materials by constructing a plate with multiple CFRP layers having different fiber area weights (100-150 g/m2 for the first layer, 20-30 g/m2 for the second layer, 100-150 g/m2 for the third layer). This multi-layer composite structure increases bending stiffness and structural strength while maintaining flexibility for folding, directly resolving the contradiction between strength and structural simplicity.
Solution Approach 2:
The plate is segmented into three distinct CFRP layers with different fiber area weights arranged in a specific sequence. The first and third layers have higher fiber area weight (100-150 g/m2) while the second layer has lower fiber area weight (20-30 g/m2), creating a segmented structure that optimizes both bending stiffness and foldability without requiring a completely complex design.
2Strength
If the plate thickness is increased to improve structural support, then the bending stiffness increases, but the device becomes harder to fold and less portable
Solution Approach 1:
The patent uses composite CFRP materials with varying fiber area weights across different layers. The combination of layers with higher fiber area weight (100-150 g/m2) and lower fiber area weight (20-30 g/m2) creates an optimal balance where the plate provides sufficient structural support while maintaining adequate flexibility for folding, avoiding the need to excessively increase overall thickness.
Solution Approach 2:
Different regions of the plate structure have different local qualities through the variation in fiber area weight across the three layers. The first and third layers have higher fiber area weight for structural support, while the second layer has lower fiber area weight to facilitate folding, creating local quality variations that simultaneously satisfy both structural support and ease of folding requirements.
3Strength
If the fiber area weight of all layers is increased to improve bending stiffness, then the structural strength increases, but the plate becomes too rigid and difficult to fold
Solution Approach 1:
The patent employs composite CFRP layers with deliberately varied fiber area weights: the first and third layers have higher fiber area weight (100-150 g/m2) for structural strength, while the second layer has lower fiber area weight (20-30 g/m2) for flexibility. This composite approach enables the plate to achieve both bending stiffness and foldability by combining materials with different properties in a coordinated structure.
Solution Approach 2:
The plate exhibits local quality variations through the strategic placement of different fiber area weights in different layers. The first and third layers have higher fiber area weight for structural support, while the second layer has lower fiber area weight to provide flexibility and foldability, allowing the structure to adapt to both rigid support requirements and flexible folding requirements simultaneously.
4Weight of moving object
If the plate is made thinner to improve portability, then the device is more portable, but the structural integrity and display quality deteriorate
Solution Approach 1:
The patent uses composite CFRP structures with optimized fiber area weights in each layer to achieve high strength-to-weight ratio. The combination of layers with fiber area weights of 100-150 g/m2 and 20-30 g/m2 creates a lightweight yet structurally intact plate that maintains display quality and structural integrity while improving portability compared to single-material or uniform-structure alternatives.
Solution Approach 2:
The plate structure is segmented into three CFRP layers with different fiber area weights, creating a multi-layer composite that optimizes the strength-to-weight ratio. This segmentation allows the plate to achieve sufficient structural integrity and display quality while maintaining reduced weight for improved portability, avoiding the need to uniformly increase thickness across the entire 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 enables a display device that is easily foldable while maintaining improved display quality and structural support, with enhanced bending stiffness and surface quality, allowing for a thinner and more portable form factor.
Implementation Method 1
a plate positioned on a rear surface of the display module; the plate includes a first layer, a second layer and a third layer each including carbon fiber reinforced plastic
Implementation Method 2
each including carbon fiber reinforced plastic, and a fiber area weight (FAW) of the second layer is 100 g/m2 to 150 g/m2
Data Source
AI summary
A display device includes: a display module; a plate positioned on a rear surface of the display module; and a digitizer positioned on a rear surface of the plate. The plate includes a first layer, a second layer, and a third layer each including carbon fiber reinforced plastic, and a fiber area weight (FAW) of the second layer is 100 g/m2 to 150 g/m2.