Gate Metal Layer Structure for Low-Resistance Foldable Displays
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Solution Overview
Problem
Display unevenness occurs in medium-size and large-size display products due to increased gate line resistance, leading to delayed scanning signals and uneven brightness, particularly in foldable displays with large bending radii.
Innovation Solution
A display substrate with a first gate metal layer made of Aluminum or its alloy, having resistivity less than 5 micro-ohm·centimeter and Young's modulus less than 130 Gpa, and optionally protected by Titanium Nitride layers, to reduce resistance and improve bending resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the screen size is increased for medium-size and large-size display products, then the display area is improved, but the gate line resistance increases causing delayed scanning signals and uneven brightness
Solution Approach 1:
The patent changes the material parameters of the gate line by using Aluminum or Al alloy instead of traditional materials, achieving resistivity less than 5 micro-ohm·centimeter and Young's modulus less than 130 Gpa. This parameter optimization reduces gate line resistance and improves scanning signal transmission reliability in large-size displays.
Solution Approach 2:
The patent employs composite material structure with Aluminum or Al alloy as the base material and Titanium Nitride as the protective layer. This composite structure combines the low resistivity and low Young's modulus of Aluminum with the protective properties of Titanium Nitride, simultaneously achieving excellent electrical conductivity and mechanical protection for the gate line.
2Ease of manufacture
If a traditional gate metal layer is used, then the manufacturing process is simple, but the bending resistance is insufficient for foldable displays with large bending radii
Solution Approach 1:
The patent creates a composite gate metal layer structure combining Aluminum/Al alloy with Titanium Nitride protective layers. This composite structure enhances bending resistance for foldable displays while maintaining manufacturing feasibility through standard deposition processes.
Solution Approach 2:
The patent uses thin film structures with controlled thickness (first conductive layer: 300-500 nm, protective layers: 30-50 nm each) that provide flexibility and bending resistance simultaneously. The thin film design allows the gate line to accommodate foldable display bending requirements while maintaining structural integrity.
Data Source
AI summary
The present disclosure provides a display substrate, a manufacturing method thereof and a display device, and relates to the field of display technology. The display substrate includes a base substrate, and a driving circuitry layer and a light-emitting unit arranged on the base substrate. The driving circuitry layer includes a first gate metal layer, and a pattern of the first gate metal layer includes a gate line. The first gate metal layer includes a first conductive layer with resistivity less than a first threshold and a Young's modulus less than a second threshold, and a first conductive protection layer arranged at a side of the first conductive layer away from the base substrate.