OLED Display Substrate Crack Stopper and Detection Line Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light-emitting diode (OLED) display substrates are prone to edge cracks, which can extend into the display region and cause defects like black spots, as existing technologies lack effective crack prevention and detection mechanisms.
Innovation Solution
A display substrate design featuring a base substrate with a display region and a non-display region, including an insulating layer, a first crack stopper to block cracks, and a first crack detection line positioned to prevent crack extension and detect microcracks, along with a second crack stopper and detection line in the non-display region to further prevent and grade crack severity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a crack stopper is added to block cracks, then crack prevention capability is improved, but device complexity increases
Solution Approach 1:
The crack stopper structure is divided into multiple functional zones: a first crack stopper in the non-display region and a second crack stopper at the boundary between display and non-display regions. This segmentation allows cracks to be blocked at different locations, improving reliability while keeping each individual crack stopper relatively simple in structure.
Solution Approach 2:
The crack stoppers are designed and positioned in advance during the substrate fabrication process, before cracks can form and propagate. The first crack stopper is preliminarily placed in the non-display region where cracks are most likely to originate, preventing crack extension into the display region before it occurs.
2Measurement precision
If a crack detection line is added to detect microcracks, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The crack detection line acts as an intermediary element between the crack stopper and the detection system. It is positioned to intersect with potential crack paths, and when a crack occurs, the detection line provides a measurable signal change that indicates crack presence and severity, enabling precise detection without complex instrumentation.
Solution Approach 2:
The crack detection line utilizes optical property changes (such as color or reflectivity changes) when cracked, allowing visual or instrumental detection of microcracks. This approach enables precise crack detection through simple optical measurement rather than complex structural analysis.
3Reliability
If multiple crack stoppers and detection lines are added, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
Different regions of the substrate are assigned different functional qualities: the non-display region contains the first crack stopper and detection line for preventive detection, while the boundary region contains the second crack stopper for final protection. This local differentiation allows each component to be optimized for its specific function with appropriate positioning tolerances, rather than requiring uniform high precision throughout the entire substrate.
Data Source
AI summary
A display substrate and a display device are disclosed. The display substrate includes a base substrate, an insulating layer, a first crack stopper, and a first crack detection line. The base substrate includes a display region and a non-display region. The insulating layer is located on the base substrate. The first crack stopper is located in the non-display region and is configured to block the first crack in the insulating layer from extending towards the display region. The first crack detection line is located in the non-display region, an edge of the orthographic projection of the first crack stopper on the base substrate close to the display region is a blocking edge, and the orthographic projection of the first crack detection line on the base substrate is located at a side of the orthographic projection of the first crack stopper on the base substrate away from the blocking edge.