Flexible Display Panel Support Layer Thermal Deformation
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Solution Overview
Problem
Flexible display panels face challenges in maintaining performance and reliability when bent at small radii due to increased stress, which can lead to signal line degradation and reduced structural integrity.
Innovation Solution
A flexible display panel design that includes a support layer with varying material properties, altered via thermal deformation, allowing for reliable permanent deformation of non-display areas, reducing stress and enabling bending at smaller radii through techniques like hot wire or hot press bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the bend radius of the outlying area is decreased to reduce planar surface area, then the display device achieves more compact form factor, but the mechanical stress in the bending area increases causing signal line degradation and reduced reliability
Solution Approach 1:
The support layer is configured with different properties in different regions: the first region has a first support layer with specific mechanical properties, while the second region has a second support layer with different mechanical properties. This local differentiation allows the bending area to accommodate higher stress while maintaining overall structural integrity, enabling small bend radii without compromising signal line reliability.
Solution Approach 2:
The display device employs a composite structure with multiple support layers having different material properties. The first support layer and second support layer are composed of materials with distinct mechanical characteristics, creating a composite system that optimizes both flexibility for bending and strength for protecting signal lines during small-radius bending operations.
2Adaptability or versatility
If the bend radius is decreased to enable flexible form factors, then the display device achieves better ergonomics and aesthetic appeal, but the mechanical stress increases reducing structural integrity
Solution Approach 1:
Different regions of the support structure are assigned different mechanical properties to balance flexibility and strength. The first region provides structural support while the second region facilitates bending, enabling the device to achieve flexible form factors without compromising overall structural integrity.
Solution Approach 2:
The support layer is segmented into multiple regions with distinct functional characteristics. This segmentation allows independent optimization of each region: one region prioritizes strength for structural integrity, while another prioritizes flexibility for bending capability, resolving the contradiction between adaptable form factor and structural strength.
3Ease of manufacture
If uniform support layer material is used throughout the non-display area, then manufacturing is simplified, but the bending area experiences excessive stress when bent at small radii
Solution Approach 1:
The support layer is manufactured with spatially varying material properties rather than uniform composition. This local quality differentiation reduces bending area stress during small-radius bending while maintaining manufacturability through established techniques such as selective material deposition or post-manufacturing treatment of specific regions.
Solution Approach 2:
The material parameters of the support layer are changed across different regions to optimize stress distribution. By varying properties such as thickness, composition, or mechanical characteristics in the first versus second region, the structure accommodates bending stresses more effectively without requiring completely different manufacturing processes.
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 approach reduces mechanical stress and maintains performance by altering the material properties of the support layer, allowing for efficient and cost-effective bending of flexible display panels with reduced risk of signal line degradation and improved structural integrity.
Implementation Method 1
altering, via thermal deformation, a property of a material of a support layer disposed on a flexible substrate in a non-display area of the flexible display panel
Data Source
AI summary
A method of bending a flexible display panel including a flexible substrate extending from a display area to a non-display area and a support layer disposed on the flexible substrate in the display area and the non-display area, the method including altering, via thermal deformation, a property of a material of the support layer disposed on the flexible substrate in the non-display area of the flexible display panel; and bending, after altering the property, a portion of the support layer in non-display area that extends from a plane of the support layer in the display area of the flexible display panel.