Foldable Display Support With Alternating Patterns Against Deformation
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Solution Overview
Problem
Foldable display devices face challenges in preventing deformation due to stress, particularly in the support plate, which can lead to structural instability and reduced durability.
Innovation Solution
The implementation of a patterned support plate with alternating first and second patterns disposed along intersecting directions, featuring holes with different shapes and Poisson's ratios, helps mitigate deformation by adjusting dimensions and shapes in response to tensile stress.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional support plate is used in foldable display devices, then the device can be folded and bent like paper, but the support plate deforms under tensile stress leading to structural instability
Solution Approach 1:
The support plate is segmented into multiple unit structures arranged in an alternating pattern. Each unit structure contains discontinuities (holes) with specific shapes that segment the material distribution, allowing the plate to flex while maintaining structural integrity through the distributed pattern of strong and flexible zones.
Solution Approach 2:
Different regions of the support plate have different local qualities through the alternating first and second patterns. The first pattern areas have different hole shapes and Poisson's ratios compared to the second pattern areas, creating localized variations in mechanical properties that collectively prevent overall deformation while allowing controlled flexibility.
2Stability of the object's composition
If the support plate is made rigid to prevent deformation, then structural stability is improved, but the device cannot be folded or bent effectively
Solution Approach 1:
The support plate incorporates dynamic characteristics through its patterned structure with alternating first and second patterns. The discontinuities in these patterns allow the plate to dynamically adapt its stiffness during folding operations, being rigid enough to maintain stability during normal operation but flexible enough to allow folding when needed.
3Stability of the object's composition
If a patterned support plate with alternating first and second patterns and different shaped holes is used, then deformation under tensile stress is reduced, but the manufacturing complexity increases
Solution Approach 1:
The first pattern and second pattern use asymmetric hole shapes with different Poisson's ratios. This asymmetry is deliberately designed to create complementary deformation characteristics that cancel out overall plate deformation under tensile stress, while the repeating nature of the alternating pattern keeps manufacturing feasible through standardization.
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
This solution effectively reduces or prevents deformation of the support plate under tensile stress, enhancing the structural integrity and durability of foldable display devices.
Implementation Method 1
the first pattern includes a first discontinuity having a first shape, and the second pattern includes a second discontinuity having a second shape different from the first shape... Poisson's ratios of opposite polarities... The dimension in the second direction of the first discontinuity may decrease and a dimension in the second direction of the second discontinuity may increase when applying a tensile stress to the patterned portion in the first direction
Data Source
AI summary
A foldable display device, includes: a flexible display module including a first non-bendable portion, a second non-bendable portion spaced from the first non-bendable portion in a first direction, and a bendable portion disposed between the first non-bendable portion and the second non-bendable portion; and a support disposed on the flexible display module, the support including a patterned portion having a first pattern and a second pattern alternatively disposed along a second direction intersecting the first direction, wherein the first pattern includes a first discontinuity having a first shape, and the second pattern includes a second discontinuity having a second shape different from the first shape.