Display Crack Detection Circuit and Prevention Dam Design
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Solution Overview
Problem
Display apparatuses face challenges in reducing dead space and enhancing durability due to cracks that can spread from the peripheral areas to the display areas, affecting image quality and durability.
Innovation Solution
The display apparatus incorporates a crack detection system and a crack prevention dam, along with an encapsulation layer comprising inorganic and organic layers, to detect and prevent crack propagation, while reducing dead space by extending these layers to the substrate's end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the peripheral area is reduced to minimize dead space, then the area utilization is improved, but the risk of crack propagation from the peripheral area to the display area increases
Solution Approach 1:
The peripheral area is divided into multiple segments: a first peripheral area containing non-display elements, a second peripheral area adjacent to the display area, and a crack prevention dam region. This segmentation isolates potential crack sources in the first peripheral area from the display area, allowing reduction of total dead space while maintaining reliability through strategic placement of protective structures.
Solution Approach 2:
A crack prevention dam is introduced as an intermediary structure between the first peripheral area (potential crack source) and the display area (protected region). The dam acts as a barrier that intercepts and stops crack propagation, enabling the design to reduce peripheral area while maintaining protection against crack spread.
2Reliability
If multiple protective layers and crack prevention structures are added to prevent crack propagation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The crack prevention dam is integrated with the existing peripheral structure and encapsulation layers, merging multiple protective functions into a unified structure. The dam is formed as part of the encapsulation process, combining crack prevention, sealing, and structural support functions, thereby reducing overall device complexity while maintaining reliability.
Solution Approach 2:
The encapsulation layers serve multiple functions simultaneously: they provide environmental sealing, mechanical support, and crack propagation prevention. The crack prevention dam also serves dual purposes as both a structural element and a crack barrier, reducing the need for separate dedicated protective components and simplifying the overall structure.
3Reliability
If the encapsulation layers extend to the end of the substrate to maximize coverage, then the protection against crack propagation is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The crack prevention dam is formed in advance during the encapsulation process, before final assembly and testing. By pre-positioning the dam structure and integrating it with the encapsulation layers during manufacturing, the design reduces the need for high-precision post-alignment operations, thereby lowering manufacturing precision requirements while maintaining extended layer coverage for maximum protection.
Data Source
AI summary
A display apparatus including a substrate; a display area arranged on the substrate and including a plurality of pixels, and a peripheral area arranged outside the display area; a dam surrounding the display area; a crack detector arranged between the dam and an end of the substrate and electrically connected to at least one of the plurality of pixels; a crack prevention dam arranged between the dam and the end of the substrate; and an encapsulation layer including a first inorganic layer, an organic layer, and a second inorganic layer, each covering the display area and a portion of the peripheral area. The first inorganic layer and the second inorganic layer in the encapsulation layer extend to the end of the substrate.