Display Substrate Power-Line Layout Against Moisture Ingress
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Solution Overview
Problem
Existing display substrates face issues with water and oxygen erosion at the line inlet port of power lines entering the encapsulation region, leading to potential encapsulation performance degradation and reduced yield.
Innovation Solution
The display substrate design includes a blocking structure with a first and second blocking dam, an auxiliary connection structure, and an organic pattern to manage the distance and contact points of power lines, reducing water vapor introduction into pixel units, and using a passivation layer to protect power lines from corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power line enters the encapsulation region from the bonding region close to the pixel units, then the electrical connectivity is improved, but water and oxygen ingress risk increases
Solution Approach 1:
The patent introduces an auxiliary connection structure as an intermediary between the power line and the cathode layer. This structure includes a first connection portion extending from the power line to a first position, and a second connection portion extending from the first position to the cathode layer, thereby mediating the electrical connection while managing the power line's path away from the pixel units
Solution Approach 2:
The patent utilizes the vertical dimension by extending the auxiliary connection structure in the thickness direction of the substrate. The first connection portion and second connection portion are arranged at different heights, creating a three-dimensional connection path that resolves the conflict between electrical connectivity and water/oxygen protection
2Object-affected harmful factors
If the power line is positioned farther from the pixel units, then water vapor ingress is reduced, but electrical connectivity may be compromised
Solution Approach 1:
The auxiliary connection structure exploits the vertical dimension by extending connection portions in the thickness direction of the substrate. This allows the power line to remain positioned away from the pixel units in the planar direction while achieving electrical connectivity through vertical extension, thus resolving the contradiction between water vapor protection and electrical connectivity
3Object-affected harmful factors
If a blocking structure is added to prevent water ingress, then encapsulation performance is improved, but device complexity increases
Solution Approach 1:
The auxiliary connection structure serves multiple functions: it provides electrical connectivity between the power line and cathode layer, manages the power line path away from pixel units, and works with the blocking structure to prevent water and oxygen ingress. This multi-functionality reduces the need for separate dedicated structures for each function
Data Source
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AI summary
A display substrate and a display device are provided in the present disclosure, and the present disclosure relates to a display technical field. The display substrate includes a base substrate, a plurality of pixel units at least one first power line, a blocking structure, an auxiliary connection structure, a cathode layer, and a first organic pattern. By arranging a distance between a first connection position closer to a first portion of the at least one first power line and the blocking structure to be larger, the water vapor introduced from the first portion of the first power line into the plurality of pixel units through the hydrophilic material in the blocking structure is reduced, which ensures the yield of the display substrate, and thus the display effect of the display substrate is guaranteed.