Flexible Display Window Sub-Film Layer Modulus Design
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Solution Overview
Problem
Existing flexible display devices face challenges in achieving excellent folding characteristics while maintaining mechanical properties and impact resistance.
Innovation Solution
A display device design featuring a folding area with sub film layers stacked in a specific direction, where the folding part includes soft sub film layers with a storage modulus of 1 MPa or less, and the non-folding part includes harder sub film layers with a storage modulus of 3 MPa or more, enhancing both folding and mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a flexible display device uses a single-layer window or support plate, then the device can be kept simple in structure, but the device cannot simultaneously achieve excellent folding characteristics and maintain mechanical properties
Solution Approach 1:
The patent applies composite materials by constructing the window and support plate as multi-layer structures comprising a first sub film layer and a second sub film layer. The first sub film layer (with storage modulus ≤1 MPa) provides flexibility for folding, while the second sub film layer (with storage modulus ≥3 MPa) maintains mechanical strength. This composite structure resolves the contradiction by combining materials with different properties to achieve both folding characteristics and structural integrity simultaneously.
Solution Approach 2:
The patent segments the window and support plate into multiple functional layers - specifically dividing them into a first sub film layer and a second sub film layer with distinct mechanical properties. This segmentation allows each layer to perform its specialized function: the softer first layer enables folding while the harder second layer provides structural support, thus resolving the contradiction between flexibility and strength.
2Strength
If the window and support plate are made with high storage modulus materials, then mechanical strength is improved, but folding characteristics deteriorate
Solution Approach 1:
The patent applies local quality by assigning different storage modulus values to different layers of the window and support plate. The first sub film layer has a storage modulus of 1 MPa or less to provide local flexibility for folding operations, while the second sub film layer has a storage modulus of 3 MPa or more to provide local structural strength. This spatial differentiation of material properties resolves the contradiction between strength and foldability.
Solution Approach 2:
By combining materials with vastly different storage moduli in a layered composite structure, the patent achieves both high mechanical strength (from the second sub film layer) and excellent folding characteristics (from the first sub film layer), resolving the contradiction between these opposing requirements.
3Ease of operation
If the window and support plate are made with soft materials for folding, then folding characteristics are improved, but impact resistance deteriorates
Solution Approach 1:
The patent uses a composite material structure where the first sub film layer (soft, storage modulus ≤1 MPa) provides folding capability while the second sub film layer (hard, storage modulus ≥3 MPa) provides impact resistance. The combination resolves the contradiction by allowing the soft layer to enable folding operations while the hard layer protects against external impacts.
Solution Approach 2:
The patent applies local quality by positioning the harder second sub film layer within the composite structure to specifically address impact resistance, while the softer first sub film layer handles folding operations. This spatial differentiation of material properties allows the structure to exhibit different mechanical responses to different types of stress.
Data Source
AI summary
A display device includes a folding area and a non-folding area divided into a first non-folding area and a second non-folding area spaced apart in a first direction with the folding area therebetween. The display device includes a display module, a window on a first surface of the display module, and a support plate on a second surface of the display module. At least one of the window and the support plate includes a folding part corresponding to the folding area and including a plurality of first sub film layers stacked in the first direction, and a non-folding part corresponding to the non-folding area and including second sub film layers stacked in the first direction. A second sub film layer of the second sub film layers has a storage modulus larger than a storage modulus of a first sub film layer of the plurality of first sub film layers.