Flexible Display Panel Support Layer Design for Small Bottom Bezel
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Solution Overview
Problem
The existing display technologies face challenges in achieving a small bottom bezel dimension, which limits the screen-to-body ratio and affects the visual experience, due to issues with the adhesion and support of flexible display panels during bending, leading to peeling and reduced firmness of the bending portion with the support layer.
Innovation Solution
A display assembly is designed with a flexible display panel, a cover plate, and support layers, where the second support layer is positioned between the first and second straight sub-portions, overlapping with the first support layer on the cover plate, and made of elastic or rigid materials, providing support and maintaining adhesion by balancing stress and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a flexible display panel is bent to achieve a small bottom bezel dimension, then the screen-to-body ratio is improved, but the adhesion between the bending portion and support layer deteriorates, causing peeling
Solution Approach 1:
The bending portion is divided into three distinct sub-portions (first straight sub-portion, arched sub-portion, and second straight sub-portion) with different structural characteristics. The first straight sub-portion maintains good adhesion to the support layer, while the arched sub-portion provides the necessary bending curvature, and the second straight sub-portion ensures proper alignment. This segmentation allows each portion to optimize its function without compromising overall adhesion.
Solution Approach 2:
Different regions of the bending portion are designed with different structural properties. The first straight sub-portion has enhanced adhesion characteristics to prevent peeling, the arched sub-portion has optimized curvature radius for stress distribution, and the second straight sub-portion has specific dimensional relationships with the support layer. This local differentiation resolves the adhesion problem while maintaining the bent configuration.
2Length of moving object
If the bending portion is bent to achieve a small bottom bezel dimension, then the screen-to-body ratio is improved, but the firmness of the bending portion deteriorates
Solution Approach 1:
The bending portion is segmented into three sub-portions where the first straight sub-portion provides structural support, the arched sub-portion provides controlled flexibility, and the second straight sub-portion provides alignment stability. This segmentation allows the bending portion to maintain firmness in critical areas while achieving the desired bent configuration for reduced bezel dimension.
Solution Approach 2:
The arched sub-portion is designed with a specific curvature radius that optimizes stress distribution during bending. The curved geometry naturally distributes mechanical stresses more evenly compared to sharp angles, thereby maintaining the firmness of the bending portion while achieving the necessary bend for the small bottom bezel dimension.
3Reliability
If the second support layer is added to support the first straight sub-portion, then the adhesion and stability are improved, but the device complexity increases
Solution Approach 1:
The first support layer and second support layer are merged in their orthogonal projections on the cover plate, creating a coordinated support system. The first support layer supports the main portion and first straight sub-portion, while the second support layer specifically supports the first straight sub-portion. Their overlapping arrangement provides enhanced adhesion and stability without requiring completely separate support structures, thus limiting the increase in device complexity.
Data Source
AI summary
A display assembly includes a flexible display panel, a cover plate, and first and second support layers. The panel includes a main portion with display surface, and a bending portion. The bending portion includes a first straight sub-portion connected to the main portion, an arched sub-portion, and a second straight sub-portion located at a surface of the main portion facing away from the display surface. The cover plate is disposed above the main portion and the first straight sub-portion. The first support layer is located between the first and second straight sub-portions, between the main portion and the second straight sub-portion, and connected to the second straight sub-portion. The second support layer is disposed between the first straight sub-portion and the cover plate, and configured to support the first straight sub-portion. An orthogonal projection of the second support layer overlaps with an orthogonal projection of the first support layer.