Organic Light-Emitting Display Scan Line Resistance Reduction
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Solution Overview
Problem
Existing organic light-emitting display apparatuses face challenges in achieving high-resolution and large-sized panels due to high resistance in the line layer, which can lead to improper initialization and data input failures.
Innovation Solution
The apparatus includes a substrate with a thin film transistor, multiple insulating layers, and conductive layers, where the second line, acting as a scan line, is formed thicker than the first line and covered by a thicker organic insulating layer to reduce resistance, and the insulating layers are made of materials like SiNx, SiO2, ZrO2, TiO2, Ta2O5, and Al2O3, with the fourth insulating layer being organic and thicker than the third, allowing for increased thickness of the scan line without planarization issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the line layer thickness is increased to reduce resistance, then the electrical conductivity is improved, but the planarization difficulty increases
Solution Approach 1:
The patent introduces a fourth insulating layer above the third insulating layer, creating an additional dimensional space. This allows the scan line to be positioned between the third and fourth insulating layers, enabling the line layer to be thicker without affecting the planarization of underlying layers. The fourth insulating layer serves as a cap that accommodates the increased line thickness.
Solution Approach 2:
The insulating layer structure is segmented into multiple distinct layers (first, second, third, and fourth insulating layers) with different functions. The third insulating layer provides planarization, while the fourth insulating layer provides coverage for the thick scan line. This segmentation allows each layer to optimize its specific function without compromising others.
2Reliability
If the scan line thickness is increased to reduce resistance, then the electrical conductivity is improved, but the manufacturing complexity increases
Solution Approach 1:
The patent merges the function of planarization and line layer coverage into the insulating layer structure. The third insulating layer provides planarization, and the fourth insulating layer is merged with the scan line formation process, allowing the thick scan line to be accommodated without requiring separate planarization steps for each layer.
3Reliability
If a thicker organic insulating layer is used to cover the scan line, then the electrical conductivity is improved, but the material consumption increases
Solution Approach 1:
The fourth insulating layer is applied locally only where needed to cover the scan line and conductive layers, rather than uniformly across the entire substrate. This localized application reduces overall material consumption while still providing the necessary coverage and planarization in the critical areas.
Data Source
AI summary
An organic light-emitting display apparatus includes a substrate; an active layer; a gate electrode, source and drain electrodes; a first insulating layer disposed between the active layer and the gate electrode; a second insulating layer disposed between the gate electrode and the source and drain electrodes; a third insulating layer disposed over the source and drain electrodes; conductive layers disposed over the third insulating layer and electrically connected to the source and drain electrodes through the third insulating layer; a first line disposed over the second insulating layer and formed of the same material as the source and drain electrodes; a second line overlapping the first line, disposed over the third insulating layer, and formed of the same material as the conductive layer; a fourth insulating layer disposed over the third insulating layer to cover the conductive layer; and an organic light-emitting diode disposed over the fourth insulating layer.