Thin Film Transistor Array Panel Metal Oxide Diffusion Barrier
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Solution Overview
Problem
As display devices increase in size, the oxide semiconductor technology for high-speed driving and reducing signal line resistance faces challenges due to the formation of porous metal oxide between the main wiring layer and passivation layer, which reduces device reliability.
Innovation Solution
A thin film transistor array panel is designed with a metal oxide layer covering the source and drain electrodes, where the electrodes include a first material and a second material that diffuses to form the metal oxide, and barrier layers are used to prevent oxidation, along with a passivation layer that contacts the metal oxide layer, thereby preventing porous metal oxide formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If porous metal oxide is formed between the main wiring layer and passivation layer to reduce resistance, then signal line resistance is reduced, but device reliability deteriorates
Solution Approach 1:
A metal oxide layer is introduced as an intermediary between the copper-based main wiring layer and the passivation layer. This metal oxide layer serves as a diffusion barrier that prevents copper atoms from migrating into the passivation layer, thereby maintaining device reliability while still allowing the wiring layer to function effectively for signal transmission
Solution Approach 2:
The patent employs composite material structures by combining copper-based materials with metal oxide materials in a layered configuration. The copper layer provides low resistance for signal transmission, while the adjacent metal oxide layer provides protective barrier functionality, creating a composite structure that achieves both electrical performance and reliability
2Reliability
If a capping layer is added to prevent oxidation of the main wiring layer, then reliability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The metal oxide layer is designed to perform multiple functions simultaneously: it acts as a diffusion barrier to prevent copper migration into the passivation layer, serves as an oxidation barrier to protect the copper-based wiring layer, and maintains electrical conductivity for signal transmission. This multi-functionality eliminates the need for separate capping layers
Solution Approach 2:
The patent merges the protective barrier function and the electrical conduction function into a single integrated metal oxide layer structure. By combining these functions that would traditionally require separate layers, the device structure is simplified while maintaining both reliability and electrical performance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the reliability of the thin film transistor array panel by preventing oxidation of the main wiring layer materials and reduces process costs by eliminating the need for a capping layer, improving the overall performance and efficiency of the display device.
Implementation Method 1
metal included in the metal oxide layer is formed by diffusing the second material
Implementation Method 2
metal included in the metal oxide layer is formed by diffusing the second material
Data Source
AI summary
A thin film transistor array panel that includes: a substrate; a gate electrode disposed on the substrate; a semiconductor layer disposed on the substrate; a gate insulating layer disposed between the gate electrode and the semiconductor layer; a source electrode disposed on the semiconductor layer and a drain electrode facing the source electrode; a metal oxide layer covering the source electrode and the drain electrode; and a passivation layer covering the source electrode, the drain electrode, and the metal oxide layer, wherein the source electrode and the drain electrode include a first material and a second material which is added to the first material and metal included in the metal oxide layer is formed by diffusing the second material.