Flexible Display Crack Guide Holes
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Solution Overview
Problem
Flexible display apparatuses face manufacturing challenges due to cracks in the inorganic layer portion of the substrate, which can propagate towards the display area, causing defects and reducing the reliability of the final product.
Innovation Solution
The method involves forming crack guide holes in the inorganic layer portion of the flexible substrate using laser drilling, either along the expected propagation path or in a direction that modifies the crack's path, and creating a crack stopping line to prevent the crack from reaching the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a flexible substrate is used instead of glass, then flexibility and portability are improved, but the inorganic layer becomes more prone to cracking during manufacturing and handling
Solution Approach 1:
The patent applies preliminary action by forming crack guide holes in the inorganic layer before final assembly and testing. These holes are strategically positioned to intercept cracks before they can propagate to critical areas, preventing defect formation in advance while maintaining the flexible substrate's adaptability
Solution Approach 2:
The crack guide holes serve as intermediary elements that mediate between the flexible substrate's need for bendability and the inorganic layer's vulnerability to cracking. The holes act as stress relief points that redirect crack propagation away from critical display areas, resolving the contradiction between flexibility and crack resistance
2Reliability
If crack guide holes are formed in the inorganic layer, then crack propagation is controlled and defect rate is reduced, but additional manufacturing steps and time are required
Solution Approach 1:
The patent replaces mechanical crack prevention methods with a laser-based approach. The laser drilling process for creating crack guide holes is more efficient and precise than mechanical drilling, reducing manufacturing cycle time while effectively controlling crack propagation and lowering defect rates
Solution Approach 2:
The patent optimizes the parameters of crack guide holes (size, spacing, depth) to achieve effective crack control with minimal additional manufacturing steps. By carefully controlling these parameters, the system reduces the number of holes needed, thereby shortening the overall manufacturing cycle while maintaining low defect rates
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
This approach effectively reduces and prevents defects in the organic light emitting devices by controlling the propagation of cracks, enhancing the reliability and quality of the flexible display apparatus.
Implementation Method 1
forming a crack guide hole in the inorganic layer portion by laser drilling
Data Source
AI summary
A method of manufacturing a flexible display apparatus and a flexible display apparatus, the method including preparing a flexible substrate such that the flexible substrate includes a display area and a peripheral area at an outer portion of the display area; forming an inorganic layer portion on the display area and the peripheral area of the flexible substrate; forming a plurality of organic light emitting devices on the display area of the flexible substrate; detecting a crack of the inorganic layer portion formed on the peripheral area of the flexible substrate; and forming a crack guide hole around the crack.