Organic Light-Emitting Display Gate Electrode Layer Stacking
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Solution Overview
Problem
In organic light-emitting display apparatuses, the existing structure where the gate electrode and gate wiring are formed on the same layer conflicts with the requirements for high resolution and improved transistor characteristics, making it difficult to satisfy both patterning needs simultaneously.
Innovation Solution
The gate electrode and gate wiring are formed on different layers with an insulating layer in between, allowing for a larger gate electrode width to improve transistor characteristics and a smaller gate wiring width for high resolution, with a conductive layer connecting them through a contact hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the gate electrode and gate wiring are formed on the same layer, then the manufacturing process is simpler, but the resolution and transistor characteristics cannot be simultaneously optimized
Solution Approach 1:
The patent applies dimensionality change by transitioning from a two-dimensional planar structure to a three-dimensional stacked structure. The gate electrode and gate wiring are formed on different layers (first gate electrode layer and second gate electrode layer) separated by an insulating layer, allowing independent dimension optimization. This vertical stacking enables the gate electrode to have a larger area for improved transistor characteristics while the gate wiring maintains a smaller width for high resolution, resolving the contradiction between manufacturing simplicity and patterning precision.
2Reliability
If the gate electrode width is increased to improve transistor characteristics, then the transistor performance improves, but the resolution decreases
Solution Approach 1:
The patent resolves this contradiction by utilizing the vertical dimension through multi-layer stacking. The gate electrode in the first layer can be designed with a larger area to improve transistor characteristics, while the gate wiring in the second layer maintains a smaller width for high resolution. The insulating layer between them provides electrical isolation, allowing independent optimization of each component's dimensions without compromising the other's performance.
Solution Approach 2:
The patent segments the gate structure into distinct functional layers: the gate electrode layer and the gate wiring layer, separated by an insulating layer. This segmentation allows each component to be independently designed and optimized for its specific function. The gate electrode can be optimized for electrical characteristics with larger area, while the gate wiring can be optimized for spatial resolution with smaller width, eliminating the need to compromise between these conflicting requirements.
Data Source
AI summary
An organic light-emitting display apparatus includes a gate electrode of a thin-film transistor (TFT) and a gate wiring electrically connected to the gate electrode and formed on different layers with an insulating layer disposed between the gate electrode and the gate wiring.