Electroluminescence Electrode Oxygen Gradient Aperture Rate
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Solution Overview
Problem
The disposition of electric resistance wires in organic electroluminescence devices reduces the overall aperture rate by allowing current to pass through unaffected light emitting units when one unit is short-circuited, leading to inefficiencies and lower performance.
Innovation Solution
A light emitting unit with a first electrode layer having a higher oxygen concentration at its top portion than at its bottom portion, which increases resistance and limits current flow when a unit is short-circuited, eliminating the need for traditional electric resistance wires and enhancing aperture rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electric resistance wires are disposed in the organic electroluminescence device to limit current flow, then reliability is improved by preventing current from passing through short-circuited units, but the aperture rate deteriorates due to the space occupied by the resistance wires
Solution Approach 1:
The patent extracts the current-limiting function from the separate electric resistance wire component and integrates it directly into the first electrode layer through oxygen concentration gradient engineering. This eliminates the need for discrete resistance wires, thereby removing the space they occupy and increasing the aperture rate while maintaining the current-limiting reliability function.
Solution Approach 2:
The patent merges the electrode function and the current-limiting resistance function into a single integrated structure (the first electrode layer). By creating an oxygen concentration gradient within this single layer, it simultaneously provides both electrical connection and controlled resistance, eliminating the need for separate components and increasing the effective light-emitting area.
2Reliability
If traditional electric resistance wires are used to isolate short-circuited units, then reliability is improved, but device complexity increases due to additional components and manufacturing steps
Solution Approach 1:
The patent extracts the current-limiting function from separate resistance wire components and embeds it within the electrode layer itself through oxygen concentration control. This integration reduces the number of discrete components, simplifying the device structure while maintaining the ability to isolate short-circuited units.
Solution Approach 2:
The first electrode layer is designed to perform multiple functions simultaneously: providing electrical connection to the light-emitting units and providing controlled resistance for current limiting. This multi-functionality reduces the need for separate specialized components, thereby reducing device complexity.
3Area of stationary object
If oxygen concentration is increased in the top portion of the first electrode layer to increase resistance, then aperture rate is improved by eliminating resistance wires, but manufacturing precision requirements increase due to the need for controlled oxygen gradients
Solution Approach 1:
The patent applies local quality by creating a spatial gradient of oxygen concentration within the first electrode layer, with higher oxygen concentration at the top portion (contacting the light-emitting layer) and lower concentration at the bottom. This localized variation in material property achieves the desired resistance distribution and current-limiting function while maintaining a simple overall structure that is feasible to manufacture.
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 increases the overall aperture rate of the electroluminescence device by preventing current from passing through unaffected units during a short-circuit, while also eliminating the need for traditional resistance wires, thus improving device performance and reducing manufacturing costs.
Implementation Method 1
A top portion of the first electrode layer has an oxygen concentration higher than that of a bottom portion of the first electrode layer... so that a contact area of the first electrode layer and the light emitting layer has a higher resistance
Implementation Method 2
A method of forming the first electrode layer includes performing a deposition process. The deposition process includes passing oxygen, and a concentration of oxygen passed in increases with a duration of the deposition process
Data Source
AI summary
A light emitting unit of an electroluminescence device and a manufacturing method thereof are provided. The light emitting unit of the electroluminescence device includes a power line, a first electrode layer, a light emitting layer and a second electrode layer. The power line is on a substrate. The first electrode layer is disposed on the substrate and is electrically connected to the power line. In particular, a top portion of the first electrode layer has an oxygen concentration higher than that of a bottom portion of the first electrode layer. The light emitting layer is disposed on the first electrode layer and the second electrode layer is disposed on the light emitting layer.