Bent Display Organic Layer Stress Distribution
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Solution Overview
Problem
Conventional display apparatuses face defects during manufacturing and have reduced usage life due to stress issues during bending processes.
Innovation Solution
A display apparatus design featuring a substrate with a first bending area, a first inorganic insulating layer, a first organic material layer, and a conductive layer that extends through the bending area, with a concavo-convex surface to distribute tension stress and reduce the likelihood of cracks and defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the display apparatus is bent to improve visibility from various angles and reduce non-display region area, then the viewing angle and display area are improved, but defects occur during manufacturing and usage life is reduced
Solution Approach 1:
The patent divides the display apparatus into distinct functional layers (substrate, inorganic insulating layer, organic material layer, conductive layer) with specific regions (first area, second area, bending area). This segmentation allows each layer to be optimized for its specific function, particularly enabling the bending area to be designed with appropriate flexibility while maintaining integrity of other components.
Solution Approach 2:
The patent applies different material properties and structural characteristics to different regions of the display apparatus. The bending area has distinct properties (flexibility, concavo-convex surface) compared to the first and second areas, allowing local adaptation to bending stresses while maintaining overall device functionality and reliability.
2Illumination intensity
If the display apparatus is bent to improve visibility from various angles, then the viewing angle is improved, but usage life is reduced due to stress issues
Solution Approach 1:
The patent introduces a concavo-convex surface structure in the bending area, creating controlled curvature that distributes mechanical stress during bending operations. This curvature design prevents stress concentration that would otherwise lead to cracks and premature failure, thereby extending the usage life of the bent display apparatus.
Solution Approach 2:
The organic material layer with concavo-convex surface acts as a cushioning element that absorbs and distributes bending stresses before they can propagate to critical components. This pre-designed stress distribution mechanism prevents defects during both manufacturing and usage phases.
3Ease of manufacture
If a conventional flat structure is used, then manufacturing is simpler, but stress concentrations occur during bending causing defects
Solution Approach 1:
The concavo-convex surface structure is formed in advance during the manufacturing process, before the bending operation occurs. This preliminary structuring of the organic material layer ensures that stress distribution is optimized from the outset, preventing defects during subsequent bending and usage without requiring complex post-manufacturing adjustments.
Data Source
AI summary
A display apparatus may include a substrate having a first bending area between a first area and a second area, the first bending area to be bent with a first bending axis that extends along a first direction, as a center; a first inorganic insulating layer on the substrate and having a first opening corresponding to the first bending area; a first organic material layer filling at least a portion of the first opening; and a first conductive layer that extends from the first area to the second area through the first bending area and is on the first organic material layer. The first organic material layer may have a concavo-convex surface at least in a portion of an upper surface thereof. At least a portion of the first conductive layer may extend along a third direction forming an angle of about 0° to about 90° with the first direction.