Flexible Display Groove Laser Ablation for Stress Relief
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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 reliability.
Innovation Solution
A manufacturing apparatus and method that uses a laser source to pulse a beam with an overlap ratio of 0.80 to 0.90 to form grooves and notches in the support layer, allowing for efficient bending of flexible display panels while minimizing stress on signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bend radius of the outlying area is decreased to reduce planar surface area, then the flexibility and compactness of the display panel is improved, but the stress applied to the bending area increases, leading to increased resistivity and reduced reliability of signal lines
Solution Approach 1:
The support layer is segmented by forming notched portions that divide it into multiple regions. These notches create a stepped structure that allows the display panel to bend at smaller radii while distributing stress across multiple levels rather than concentrating it in a single bending zone, thereby maintaining signal line reliability
Solution Approach 2:
The support layer is modified locally by forming notched portions only in specific outlying areas rather than uniformly across the entire structure. This localized modification enables bending in specific regions while maintaining structural integrity and stress distribution in critical areas containing signal lines
2Adaptability or versatility
If the bend radius is decreased to enable permanent deformation, then the flexibility and adaptability of the display panel is improved, but the stress on signal lines increases, causing increased resistivity
Solution Approach 1:
The support layer is divided into notched portions that create a stepped configuration, allowing the panel to achieve permanent deformation at small bend radii while the segmented structure distributes mechanical stress away from signal lines, preventing resistivity changes
Solution Approach 2:
The support layer is transformed from a flat two-dimensional structure to a three-dimensional stepped structure with notched portions. This dimensional change allows the panel to bend more sharply while the vertical steps provide stress relief pathways that protect signal lines from excessive stress
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 enables flexible display panels to be permanently deformed at small bend radii with maintained performance and reliability, reducing stress on signal lines and enhancing the structural integrity and display quality.
Implementation Method 1
control a laser source to pulse an output laser beam towards a target; and control at least one of the laser source and the target to scan relative to the other such that an overlap ratio between consecutive pulse spots of the output laser beam is greater than or equal to 0.80 and less than or equal to 0.90
Implementation Method 2
forming a groove in a first area of a layered structure of the flexible display panel; and bending a portion of the first area including the groove
Data Source
AI summary
A method of manufacturing a flexible display panel includes forming a groove in a first area of a layered structure of the flexible display panel, and bending a portion of the first area including the groove from a plane of a second area of the layered structure. The second area extends from the first area. Forming the groove includes radiating a pulsating laser beam along an imaginary line corresponding to the groove such that an overlap ratio between consecutive pulse spots of the pulsating laser beam is greater than or equal to 0.80 and less than or equal to 0.90.