Bendable Display Stress Management via Localized Modulus Segmentation
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Solution Overview
Problem
Electronic devices with bendable display apparatuses face defects due to bending stress, which existing technologies fail to adequately address, leading to potential structural and functional issues.
Innovation Solution
A display apparatus design incorporating a stress relief member with a lower modulus of elasticity and an adhesive member with a higher modulus, along with a flexible circuit board and anisotropic conductive film, to manage stress during bending, while a protective member and anti-reflection layer enhance durability and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If the display apparatus is bent to provide a slimmer bezel, then the device design is improved and bezel thickness is reduced, but bending stress causes defects and structural issues
Solution Approach 1:
The display apparatus is divided into distinct functional regions: a curvature region for bending, a facing region for display, and a non-bending region for structural support. This segmentation allows the bending function to be isolated to a specific area, preventing stress from affecting the entire structure and thus maintaining overall reliability while achieving the slimmer bezel design.
Solution Approach 2:
Different regions of the display apparatus are assigned different mechanical properties. The curvature region is designed to be flexible for bending, while the non-bending region maintains rigidity for structural support. The adhesive member is strategically placed in the facing region with specific elastic modulus characteristics to manage stress locally, ensuring that bending occurs only where intended without compromising overall structural integrity.
2Stress or pressure
If a stress relief member with lower modulus of elasticity is used in the curvature region, then stress during bending is reduced, but the structural strength may be compromised
Solution Approach 1:
The stress relief member is placed specifically in the curvature region where bending occurs, allowing it to have lower modulus of elasticity to reduce stress concentration. Meanwhile, the non-bending region and supporting structures maintain higher strength characteristics, ensuring that the overall structural integrity is preserved while enabling flexible bending in the designated area.
3Strength
If an adhesive member with higher modulus of elasticity is used in the facing region, then structural integrity is maintained, but stress concentration may occur during bending
Solution Approach 1:
The adhesive member is strategically positioned in the facing region, which is spaced apart from the curvature region. This local placement allows the adhesive to maintain structural integrity in the display area while the stress relief member in the curvature region manages bending stress, preventing stress concentration at the adhesive interface.
4Shape
If the facing region is made bendable to achieve slimmer bezel, then device design is improved, but defects are produced due to bending stress
Solution Approach 1:
The display apparatus is segmented into a curvature region for bending and a facing region for display. By isolating the bending function to the curvature region and maintaining the facing region as a separate, stable area, the design achieves slimmer bezel without producing defects in the display area.
Solution Approach 2:
The adhesive member acts as an intermediary between the curvature region and the facing region. It connects these two regions while managing stress transmission, allowing the facing region to maintain manufacturing precision and avoid defects even as the curvature region bends to achieve the slimmer bezel design.
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 solution effectively disperses stress during bending, enhances impact resistance, and maintains structural integrity and visibility, thereby improving the reliability and performance of bendable display devices.
Implementation Method 1
a stress relief member disposed in the curvature region and on the upper surface of the base substrate... The adhesive member has a higher modulus of elasticity than that of the stress relief member
Implementation Method 2
an adhesive member disposed in the facing region and on the upper surface of the base substrate. The adhesive member has a higher modulus of elasticity than that of the stress relief member and is coupled to the flexible circuit board
Implementation Method 3
an anisotropic conductive film disposed between the first pad and the second pad and connecting the first pad and the second pad
Data Source
AI summary
A display apparatus includes a display panel including: a bending region having a curvature region and a facing region adjacent to the curvature region; and a non-bending region adjacent to the bending region and spaced apart from the facing region. The curvature region is disposed between the facing region and the non-bending region. The display apparatus further includes: a first protective member disposed in the non-bending region; a flexible circuit board connected to the display panel in the facing region; a stress relief member disposed in the curvature region; and an adhesive member disposed in the facing region. The adhesive member has a higher modulus of elasticity than that of the stress relief member and is coupled to the flexible circuit board.