OLED Insulating Layers Prevent Short-Circuits
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Solution Overview
Problem
High-resolution organic light-emitting display devices face challenges with short-circuit defects due to particle penetration and morphology issues in insulating layers, limiting display quality and aperture ratio.
Innovation Solution
The implementation of a multi-layered electrode structure with specific insulating layers and contact openings, using inorganic and organic materials, to prevent short-circuits and improve electrical characteristics, along with a separate etching process for the first electrode to enhance aperture ratio and resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single insulating layer is used between electrodes, then the manufacturing process is simple, but short-circuits occur due to particle penetration and morphology defects
Solution Approach 1:
The single insulating layer is divided into multiple insulating layers with different materials and functions. The first insulating layer uses inorganic material for barrier properties, while the second uses organic material for planarization and flexibility, collectively preventing short-circuits more effectively than a single layer
Solution Approach 2:
The patent employs a composite insulating structure combining inorganic and organic materials. The inorganic insulating layer provides particle barrier properties, while the organic insulating layer provides morphology control and planarization, creating a synergistic effect that prevents both particle penetration and morphology defects
2Ease of manufacture
If contact hole size is increased to facilitate manufacturing, then the manufacturing process is easier, but the aperture ratio decreases
Solution Approach 1:
The patent applies different quality requirements to different regions: the first contact opening is designed to be small with precise positioning for electrical connection, while the second contact opening is larger for manufacturing tolerance. This local differentiation allows minimal aperture occupation while ensuring manufacturability
Solution Approach 2:
The patent introduces a vertical dimension by creating a multi-layer contact structure where the first contact opening goes through the first insulating layer and the second contact opening goes through the second insulating layer. This three-dimensional arrangement allows small horizontal footprint while maintaining manufacturing accessibility
3Manufacturing precision
If wiring line width is decreased for high resolution, then the display resolution is improved, but short-circuit defects occur more frequently
Solution Approach 1:
The insulating protection is segmented into multiple layers, with the first inorganic layer providing particle barrier and the second organic layer providing morphology control. This segmented approach ensures that even when wiring line width is decreased for high resolution, each layer independently addresses specific failure modes
Solution Approach 2:
The patent applies beforehand cushioning by forming the first inorganic insulating layer before the second organic insulating layer. The inorganic layer is deposited to cover potential particle penetration paths, and the organic layer is formed to planarize the surface, providing preemptive protection against short-circuits before they can occur
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 configuration effectively prevents short-circuits, improves display quality, and increases the aperture ratio by minimizing contact hole size and optimizing electrical characteristics, while allowing for high-resolution implementation and material flexibility.
Implementation Method 1
a first insulating layer covering the gate electrode and having a first contact opening; and a second insulating layer covering the first insulating layer and having a second contact opening
Implementation Method 2
the second insulating layer may include an organic material... A top surface of the second interlayer insulating layer may have a planarized surface
Implementation Method 3
When the insulating layer is formed, a short-circuit may occur between elements to be insulated by the insulating layer... This configuration effectively prevents short-circuits
Data Source
AI summary
An organic light-emitting display device includes: a substrate; an active layer on the substrate; a gate electrode insulated from the active layer and overlapping with the active layer; a source electrode including a first source electrode layer, connected to the active layer, and a second source electrode layer connected to the first source electrode layer, the second source electrode layer being larger than the first source electrode layer; a drain electrode including a first drain electrode layer connected to the active layer, and a second drain electrode layer connected to the first drain electrode layer, the second drain electrode layer being larger than the first drain electrode layer; a first electrode directly connected to a top surface of the source electrode or the drain electrode; an intermediate layer on the first electrode and including an organic emission layer; and a second electrode on the intermediate layer.