Stretchable Display Substrate Layout With Low-Resistance Signal Bridges
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In stretchable display substrates, the high wiring resistance of transverse signal lines and connecting bridges due to the use of different layers for signal lines and gates complicates the via-hole process, making it difficult to control and densify the wiring effectively.
Innovation Solution
The display substrate design includes first and second signal lines and connecting bridges in the same layer as the gates and sources/drains of thin film transistors, eliminating the need for a via-hole process and using materials like aluminum alloy for reduced resistance and improved elasticity, with resistivity and elongation at break optimized for better performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If signal lines and gates are disposed in different layers, then wiring can be organized separately, but wiring resistance increases and the via-hole process becomes complex and difficult to control
Solution Approach 1:
The patent merges the signal line layer and gate layer into a single layer, eliminating the need for via-hole connections between layers. This reduces wiring resistance by removing interface contact resistance and simplifies the fabrication process by eliminating the via-hole formation steps, directly resolving the technical contradiction between low resistance and process simplicity
2Reliability
If different materials are used for signal lines and gates, then each can be optimized for its function, but manufacturing complexity increases
Solution Approach 1:
The patent uses the same aluminum alloy material for both signal lines and gates, creating material homogeneity that simplifies the fabrication process to a single material deposition and patterning step. This maintains good electrical performance while significantly improving ease of manufacture compared to using different materials
3Adaptability or versatility
If traditional materials are used for connecting bridges, then material availability is good, but stretchability and elasticity are insufficient
Solution Approach 1:
The patent changes the material parameter from traditional rigid metals to aluminum alloy with specific elastoplastic properties (resistivity 1-4 μOhmcm, elongation at break 1.5-3%). This parameter change enables the connecting bridges to stretch with the substrate while maintaining electrical connectivity, achieving both stretchability and manufacturability
Data Source
AI summary
Provided is a method for preparing a display substrate. The method includes: providing a substrate, the substrate including a plurality of pixel island regions spaced apart and a plurality of bridge regions connecting adjacent pixel island regions; forming thin film transistors and first signal lines in the pixel island regions, and forming first connecting bridges in the bridge regions; and forming second signal lines, second connecting bridges, and a source/drain layer on the substrate by a one-time patterning process.