TFT-LCD Wire Structure Adhesion and Resistance
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Solution Overview
Problem
The poor sticky properties of wires in the wire metal structure during the manufacturing of TFT-LCDs lead to issues such as peeling off of the metal film, affecting the resistance and parasitic capacitance, which are critical for high-frequency and high-resolution displays.
Innovation Solution
A three-layer structure for the first layer of wires is implemented, comprising a lower high attachment metal layer, an intermediate conductive layer with a lower resistance, and an upper high attachment metal layer, made of materials like molybdenum or its alloys, to enhance adhesion and reduce resistance and capacitance, while maintaining cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer wire structure is used, then the manufacturing process is simple, but the adhesion performance is poor causing metal film peeling
Solution Approach 1:
The wire structure is segmented into three distinct layers: a first high adhesion metal layer, an intermediate electroconductive layer, and a second high adhesion metal layer. This segmentation allows each layer to perform its specific function - the intermediate layer provides low resistance while the outer layers provide adhesion, resolving the contradiction between manufacturing simplicity and adhesion performance.
Solution Approach 2:
The wire structure uses composite materials by combining different metal materials with distinct properties. The intermediate layer uses a metal with lower resistance characteristics, while the outer layers use metals with better adhesion performance. This composite approach achieves both good adhesion and low resistance without compromising manufacturing feasibility.
2Reliability
If the intermediate electroconductive layer thickness is increased, then the resistance and parasitic capacitance decrease, but the manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by making the intermediate electroconductive layer thicker than the outer high adhesion metal layers. This localized thickness variation optimizes the electrical performance where it matters most (in the conductive path) while keeping the overall structure manageable for manufacturing.
3Reliability
If high adhesion metal materials are used with sufficient thickness, then the adhesion performance improves, but the manufacturing cost increases
Solution Approach 1:
The patent applies partial action by using high adhesion metal materials only in the outer layers where adhesion is critical, rather than throughout the entire wire structure. The intermediate layer uses a thinner, lower-cost material optimized for electrical conductivity, reducing overall material cost while maintaining adhesion performance.
Data Source
AI summary
A display panel includes a substrate and a first layer of wires. The first layer of wires are disposed on the substrate. A lower portion of the first layer of wires includes a first high attachment metal layer, an upper portion of the first layer of wires includes a second high attachment metal layer, and a middle of the first layer of wires includes an intermediate electroconductive layer. The first layer of wires are connected to a column scan driver of the display panel.