Display Substrate Staggered Via Layout for Stable Layer-Changing Wires
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Solution Overview
Problem
Existing display technologies face challenges in maintaining stable signal wire connections, particularly in layer changing designs, which can lead to increased risk of wire breakage and reduced performance and yield due to excessive drop height of film layers.
Innovation Solution
A display substrate design featuring a staggered opening configuration in insulating layers to reduce the lap joint height and prevent signal wire breakage, with a transitional connection layer facilitating electrical connections between first and second wire layers, thereby ensuring stable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a layer changing design is used to route signal wires between different layers, then wire routing flexibility is improved, but the risk of wire breakage increases due to excessive drop height of film layers
Solution Approach 1:
The patent divides the layer changing process into multiple stages by introducing intermediate insulating layers with openings. Instead of a single large drop, the wire transition is segmented into smaller steps across multiple layers, reducing the drop height at each stage and minimizing the risk of wire breakage while maintaining routing flexibility.
Solution Approach 2:
The patent introduces intermediate insulating layers with openings as mediators between the first and second wire layers. These intermediate layers provide a gradual transition path for signal wires, reducing the abrupt drop height and preventing wire breakage during the layer changing process.
2Reliability
If multiple insulating layers with openings are used to facilitate wire connections, then wire connection reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The intermediate insulating layers serve multiple functions: they provide mechanical support to reduce drop height, create openings for wire passage, and maintain electrical insulation. This multi-functionality reduces the need for additional specialized components, thereby limiting the increase in device complexity while improving wire connection reliability.
3Reliability
If the drop height of film layers is reduced to prevent wire breakage, then wire connection reliability is improved, but the layer changing capability is limited
Solution Approach 1:
The patent resolves the contradiction by adding a temporal dimension to the layer changing process. Instead of achieving layer changing in a single large drop, the process is distributed across multiple smaller drops through intermediate layers, allowing both reliability and adaptability to be maintained through a multi-stage transition.
Data Source
AI summary
The disclosure discloses a display substrate and a display device. The display substrate includes a base substrate, and a first wire layer, a first insulating layer, a transitional connection layer, a second insulating layer, a third insulating layer, and a second wire layer sequentially arranged on a wire changing region of the substrate; first wires of the first wire layer are electrically connected to electrical connection portions of the transitional connection layer through a first opening of the first insulating layer, and the electrical connection portions are electrically connected to second wires of the second wire layer through a second opening of the second insulating layer and a third opening of the third insulating layer; at least two of a projection of the first opening, a projection of the second opening, or a projection of the third opening on the substrate are staggered in positions.