Micro-LED Display Crack Detection Using Integrated Line Networks
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Solution Overview
Problem
Existing display apparatuses face challenges in detecting cracks effectively, which can lead to potential defects, reduced lifespan, and increased power consumption, as well as impurity permeation due to cracks.
Innovation Solution
Incorporation of crack detection lines in the display area that connect drive circuits, allowing for easy detection of cracks through communication between adjacent circuits, with positional mapping of crack occurrences, and minimizing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If crack detection lines are added to the display area, then crack detectability is improved, but device complexity increases
Solution Approach 1:
The crack detection lines utilize the existing drive circuits in the display area, making the drive circuits serve dual purposes: driving display elements and detecting cracks. This eliminates the need for separate dedicated detection circuits, thereby improving crack detectability without significantly increasing device complexity.
Solution Approach 2:
The drive circuits perform self-diagnosis by detecting changes in their own electrical characteristics when cracks occur in the display area. The detection lines are integrated into the existing drive circuit architecture, allowing the system to monitor its own health status without external intervention or additional complex detection hardware.
2Measurement precision
If crack detection lines are added to the display area, then crack detectability is improved, but manufacturing complexity increases
Solution Approach 1:
The drive circuits are designed to perform both display driving and crack detection functions. By integrating crack detection capabilities into existing drive circuits rather than adding separate detection hardware, the manufacturing process avoids the complexity of fabricating and assembling additional dedicated detection components.
Solution Approach 2:
The crack detection lines are merged with the existing drive circuit layout in the display area. This integration allows the detection functionality to be incorporated during the same manufacturing process as the drive circuits, eliminating the need for separate manufacturing steps or assembly operations for dedicated detection hardware.
3Measurement precision
If multiple crack detection lines are added, then crack position mapping accuracy is improved, but device complexity increases
Solution Approach 1:
The display area is divided into multiple segments with drive circuits arranged in a matrix pattern. Crack detection lines are distributed across these segments, allowing cracks to be localized to specific regions based on which drive circuits detect anomalies. This segmentation enables accurate crack position mapping while using the existing modular drive circuit architecture.
Solution Approach 2:
Multiple crack detection lines are arranged in both row and column directions, creating a two-dimensional detection network. This dimensional arrangement allows for precise spatial mapping of crack positions by identifying intersections or patterns across multiple detection lines, achieving high position mapping accuracy without requiring excessive additional components.
Data Source
AI summary
A display apparatus and a method of detecting a crack in the display apparatus are discussed. The display apparatus can include a substrate having a display area and a non-display area, a plurality of drive circuits disposed in a matrix form on the substrate in the display area, a plurality of insulation layers disposed on the plurality of drive circuits, a plurality of banks disposed on the plurality of insulation layers in the display area, a plurality of micro-LEDs disposed on the banks, a plurality of first crack detection lines disposed on the plurality of drive circuits in the display area and extending in a first direction, and a plurality of second crack detection lines disposed on the plurality of drive circuits in the display area and extending in a second direction intersecting the first direction.