Display Crack Detection Electrodes for Edge Reliability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Display apparatuses are prone to cracks when moved or handled, leading to moisture and oxygen ingress, which can oxidize organic light-emitting diodes and reduce their reliability, necessitating improved crack detection methods.
Innovation Solution
A display apparatus with a substrate having a display area and a peripheral area, featuring crack detection electrodes and auxiliary electrodes that extend along the edges, connected through conductive layers, allowing for enhanced crack detection by measuring electrical signals across these electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If crack detection electrodes are extended to the peripheral area, then crack detection range is improved, but device complexity increases
Solution Approach 1:
The crack detection electrodes are integrated with the existing conductive layers (first, second, and third conductive layers) that are already part of the display apparatus structure. These layers serve both their original functions and crack detection functions, eliminating the need for separate dedicated detection electrode structures and reducing overall device complexity while maintaining extended detection capability.
Solution Approach 2:
The crack detection capability is extended from the display area into the peripheral area by utilizing the vertical stacking of multiple conductive layers. The first crack detection electrode in the first conductive layer, second crack detection electrode in the second conductive layer, and third crack detection electrode in the third conductive layer work together across different dimensional levels to provide comprehensive crack detection coverage in both display and peripheral regions.
2Measurement precision
If multiple conductive layers with crack detection electrodes are added, then detection accuracy is improved, but manufacturing complexity increases
Solution Approach 1:
The crack detection electrodes are merged with the existing conductive layers used for display functionality. The first conductive layer with first crack detection electrode, second conductive layer with second crack detection electrode, and third conductive layer with third crack detection electrode are integrated into the standard manufacturing process of the display apparatus, allowing simultaneous formation of display and detection functions without requiring separate manufacturing steps.
Solution Approach 2:
Each conductive layer serves dual purposes: maintaining electrical connectivity for display operation and providing crack detection capability. This multi-functionality reduces the need for additional manufacturing processes and materials, as the same structural elements perform both display and detection roles.
3Reliability
If crack detection electrodes extend to peripheral area, then reliability is improved by preventing moisture ingress, but device complexity increases
Solution Approach 1:
The crack detection electrodes are configured in advance to extend into the peripheral area where cracks are most likely to initiate and propagate. By having the first, second, and third crack detection electrodes positioned in the peripheral region before any crack occurs, the system can detect early-stage cracks and alert users to prevent moisture and oxygen ingress that would otherwise compromise the organic light-emitting diode reliability.
Solution Approach 2:
The extended electrode structure serves dual functions: maintaining electrical connectivity for display operation and providing early crack detection in the peripheral area. This prevents moisture and oxygen ingress by enabling timely detection and user response, while avoiding the need for separate protective structures.
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 accurate and wide-range detection of cracks, improving the reliability of display apparatuses by preventing moisture and oxygen ingress, thus extending their lifespan and performance.
Implementation Method 1
allowing for enhanced crack detection by measuring electrical signals across these electrodes
Data Source
AI summary
A display apparatus includes a first pad at one side of a substrate; a first semiconductor layer on the substrate; a first crack detection electrode interposed between the substrate and the first semiconductor layer, and including a first end portion at the one side and a second end portion at another side; a second crack detection electrode disposed on the first semiconductor layer, and including a first end portion located at the one side and a second end portion connected to the second end portion of the first crack detection electrode; and a first auxiliary electrode disposed on the second conductive layer, and including a first end portion connected to the second end portion of the first crack detection electrode and a second end portion electrically connected to the first pad.