Flexible Display Substrate Corner Notches and Hollow Structures
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Solution Overview
Problem
Flexible display substrates experience corrugations at corners during stretching due to extrusion, affecting attachment to bezels and reducing screen-to-body ratio.
Innovation Solution
Incorporating notches in the second region of corner regions and a hollow structure with I-shaped holes in the peripheral region of the flexible display substrate, which absorb compression deformation and improve tensile deformation, allowing for deeper attachment and increased screen-to-body ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the flexible display substrate is stretched for attachment to bezels, then the attachment depth increases, but corrugations occur at corner regions due to compression deformation
Solution Approach 1:
The corner region is segmented into multiple functional zones: first corner regions with hollow structures for tensile deformation absorption, second corner regions with notches for compression deformation absorption, and a transition region connecting them. This segmentation allows different parts of the corner to handle different types of deformation independently, preventing corrugation while enabling deep attachment.
Solution Approach 2:
Different structural features are applied to different locations: hollow structures (I-shaped holes) are placed in first corner regions where tensile deformation occurs during stretching, while notches are placed in second corner regions where compression deformation occurs. This localized structural optimization ensures each region addresses its specific deformation mode, eliminating corrugation while maintaining attachment depth.
2Reliability
If hollow structures are added to absorb tensile deformation, then attachment effectiveness improves, but device complexity increases
Solution Approach 1:
The hollow structure is segmented into an array of I-shaped holes with specific dimensions (length 170-600 μm, width 4-50 μm) and spacing (80-200 μm). This segmentation provides distributed deformation absorption throughout the corner region, improving reliability while maintaining a regular, manufacturable pattern that doesn't excessively increase complexity.
Solution Approach 2:
The hollow structures use specifically optimized parameters: I-shaped hole dimensions (170-600 μm length, 4-50 μm width) and spacing (80-200 μm) are tuned to provide sufficient deformation absorption capacity. These parameter optimizations ensure effective attachment while keeping the structure compact and manufacturable, balancing reliability improvement against complexity increase.
3Shape
If notches are added to absorb compression deformation, then corner region corrugation is mitigated, but manufacturing precision requirements increase
Solution Approach 1:
The corner region is divided such that notches are confined to specific second corner regions away from the precise display active area. This spatial segmentation allows notch formation with relaxed precision requirements in non-critical areas, while the display region maintains its required precision through the transition region design that connects the notched area to the display area.
Data Source
AI summary
Provided is a flexible display substrate, including: a peripheral region and a display region. The peripheral region surrounds the display region. The peripheral region has a plurality of corner regions, and at least one of the corner regions includes two first regions and a second region disposed between the two first regions. The first region has a hollow structure, and the second region has at least one notch disposed in an edge of the flexible display substrate.