Display Substrate Power-Line Layout for Encapsulation Sealing
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Solution Overview
Problem
Existing display substrates face challenges in preventing water and oxygen ingress, particularly when power lines enter encapsulation regions, which can compromise encapsulation performance and lead to defects.
Innovation Solution
The display substrate design includes a base substrate with pixel units, a blocking structure, an auxiliary connection structure, a cathode layer, and power lines with specific configurations to reduce water vapor introduction. The power lines have distinct portions and connection positions that minimize water vapor entry through hydrophilic materials in the blocking structure.
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 power signal can be effectively transmitted to the cathode layer, but water and oxygen can be introduced into the pixel units through the blocking structure, compromising encapsulation performance
Solution Approach 1:
The power line is divided into multiple segments: a first portion extending from the bonding region to the blocking structure, and a second portion extending from the blocking structure to the cathode layer. This segmentation allows the power line to bypass the high-risk area where water and oxygen ingress occurs, while still maintaining effective electrical connection between the bonding region and the cathode layer, thus preserving encapsulation performance.
Solution Approach 2:
The blocking structure serves as an intermediary element that the power line connects to at a distance. Instead of directly entering the encapsulation region near the pixel units, the power line connects to the blocking structure at a first connection position and a second connection position, both located at distances that prevent water and oxygen ingress while still enabling effective power signal transmission to the cathode layer.
2Object-affected harmful factors
If the power line is positioned farther from the blocking structure, then water vapor introduction is reduced, but the connection effectiveness and power signal transmission may be compromised
Solution Approach 1:
The power line connection is extended into the vertical dimension by having the second portion of the power line connect to the cathode layer through the auxiliary connection structure. This allows the power line to maintain adequate horizontal distance from the blocking structure to prevent water vapor introduction, while still achieving effective vertical connection to the cathode layer for reliable power signal transmission.
Data Source
AI summary
Provided is a display substrate including 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. A distance between a first connection position closer to a first portion of the at least one first power line and the blocking structure is arranged to be larger.