Display Substrate Clock-Line Via Layout for Stable Scan Signals
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Solution Overview
Problem
The connection stability between shift register units and clock signal lines in display substrates is prone to instability, affecting the output of scanning signals, particularly due to static electricity and structural vulnerabilities in the connection members.
Innovation Solution
A display substrate design featuring a base substrate with a first and second signal transmission line in the same layer, connected through vias and insulating layers, and a connection member that ensures signal transmission reliability by maintaining connection stability even if the climbing portions are broken, using specific geometric and material configurations to enhance reliability and reduce the likelihood of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single via connection is used between signal transmission lines, then the structure is simple, but the connection reliability is low due to potential breakage of climbing portions
Solution Approach 1:
The connection member is divided into multiple climbing portions (first climbing portion and second climbing portion) that connect different signal transmission lines through separate vias. This segmentation ensures that if one climbing portion breaks, the other can still maintain the electrical connection, thereby improving connection reliability without requiring a completely redundant dual-line structure.
Solution Approach 2:
The patent incorporates multiple via connections and climbing portions in advance to compensate for potential breakage. By pre-establishing multiple connection paths through the insulating layers, the system is cushioned against the harmful effect of single-point failures, ensuring continuous signal transmission even when one path fails.
2Reliability
If the climbing portion slope angle is large, then the connection is more stable, but the manufacturing precision requirement increases
Solution Approach 1:
The patent specifies that the slope angles of the first and second climbing portions should be between 35° and 64° and 35° and 62° respectively. By controlling the slope angle within this optimal range, the connection achieves sufficient stability while avoiding excessive manufacturing precision requirements. This parameter optimization balances connection reliability with manufacturability.
3Reliability
If multiple vias are used to connect signal transmission lines, then the current resistance decreases, but the insulating layer thickness requirement increases
Solution Approach 1:
The insulating layer is segmented into a first insulating layer and a second insulating layer, with vias penetrating only the necessary thickness of each layer. The first via penetrates the first insulating layer while the second via penetrates the second insulating layer. This segmentation allows multiple via connections to reduce current resistance while keeping each individual insulating layer thickness manageable, avoiding the need for a single thick insulating layer.
Data Source
AI summary
A display substrate, a manufacturing method thereof and a display device are provided. The display substrate includes: a base substrate; a first signal transmission line and including first and second transmission sub-lines side by side in a same layer and electrically connected together; a first insulating layer on side of the first signal transmission line away from the base substrate; a second signal transmission line on side of the first insulating layer away from the base substrate and connected to the first transmission sub-line through a first via; a second insulating layer on a side of the second signal transmission line away from the base substrate; and a first connection member on a side of the second insulating layer away from the base substrate, connected to the second signal transmission line through a second via and to the second transmission sub-line through a third via.