Oxide TFT Display Barrier for Hydrogen-Induced Circuit Degradation
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Solution Overview
Problem
Hydrogen penetration from the bezel area into the display area degrades the characteristics of driving circuits in display apparatuses, leading to image quality deterioration.
Innovation Solution
A display apparatus design featuring a barrier line with a hydrogen blocking material and a barrier trench penetrating inorganic insulating layers, combined with a cover pattern on the trench's side-wall, to prevent hydrogen movement from the bezel to the display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a barrier structure is introduced to block hydrogen migration, then the reliability of driving circuits is improved, but the device complexity increases
Solution Approach 1:
The barrier structure is segmented into multiple functional components: a barrier line extending along the display area edge, barrier trenches penetrating inorganic insulating layers at specific locations, and cover patterns filling these trenches. This segmentation allows hydrogen blocking functionality to be distributed throughout the structure, effectively preventing hydrogen migration while maintaining manufacturing feasibility through modular construction
Solution Approach 2:
The barrier structure implements local quality by concentrating hydrogen blocking features specifically at the boundary between the display area and bezel area, where hydrogen migration originates. The barrier line is positioned along the edge, and barrier trenches are created at strategic locations where inorganic insulating layers are thinnest or where hydrogen penetration risk is highest, rather than uniformly across the entire device
2Manufacturing precision
If multiple inorganic insulating layers are used to protect driving circuits, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The inorganic insulating layers are formed preliminary to the organic insulating layers and light-emitting device fabrication. The barrier line and barrier trenches are integrated into the inorganic insulating layer structure before subsequent processing steps, ensuring that hydrogen blocking functionality is established early in the manufacturing sequence, which simplifies later fabrication steps and maintains manufacturing precision
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 design effectively blocks hydrogen migration, minimizing the degradation of driving circuit characteristics and enhancing the reliability and image quality of the display apparatus.
Implementation Method 1
A barrier line is disposed between the device substrate and the plurality of inorganic insulating layers in the bezel area. The barrier line includes a hydrogen blocking material.
Data Source
AI summary
A display apparatus including an oxide semiconductor is provided. The display apparatus includes a driving circuit and a light-emitting device on a display area of a device substrate. The driving circuit can be electrically connected to the light-emitting device. The driving circuit can include at least one thin film transistor. A semiconductor pattern of the thin film transistor can include an oxide semiconductor. The display area can be surrounded by a barrier line. The barrier line can include a hydrogen blocking material. A barrier trench can penetrate inorganic insulating layers stacked on the barrier line. A cover pattern can be on a side-wall of the barrier trench. Thus, in the display apparatus, the movement of hydrogen from an edge of the device substrate toward the display area can be blocked. Therefore, the degradation in the reliability of the driving circuit due to the penetration of the hydrogen can be prevented.