OLED First Electrode Cross Sectional Area Variation
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Solution Overview
Problem
Conventional organic light emitting devices face issues with light emitting uniformity and efficiency due to the degradation of the organic layer formed by a soluble process, leading to variations in luminosity and electric field across the device.
Innovation Solution
The organic light emitting device is designed with a first electrode having different cross-sectional areas adjacent to and separated from a bank, creating a larger electric field near the first area and a smaller field near the second area, achieved through varying thickness or material resistance, to maintain uniformity and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the organic layer is formed by a soluble process, then the manufacturing complexity is reduced, but the light emitting uniformity and efficiency are degraded
Solution Approach 1:
The first electrode is designed with different cross-sectional areas at different locations: a first cross-sectional area adjacent to the bank and a second cross-sectional area surrounded by the first area. This local variation in electrode geometry creates different electric field strengths in different regions, compensating for the non-uniformity introduced by the soluble process and achieving uniform light emission across the device.
2Ease of manufacture
If the organic layer is formed by a soluble process, then the manufacturing cost is reduced, but the light emitting efficiency is lowered
Solution Approach 1:
The electrode structure with varying cross-sectional areas creates optimized electric field distribution that enhances carrier injection and transport in different regions. The first area adjacent to the bank provides stronger electric field for improved carrier injection, while the second surrounded area maintains appropriate field strength for efficient recombination, overall improving light emitting efficiency despite using cost-effective soluble processes.
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 enhances light emitting uniformity and efficiency by ensuring consistent current flow and voltage distribution across the organic layer, preventing degradation and improving the overall performance of the device.
Implementation Method 1
a first electric field between the first area of the first electrode and the second electrode is greater than a second electric field between the second area of the first electrode and the second electrode
Implementation Method 2
An organic light emitting device emits light using an electroluminescence phenomenon in which an organic compound placed between electrodes emits light when electric current flows between both electrodes
Data Source
AI summary
Disclosed is an organic light emitting device, (OLED) comprising a substrate on which a driving transistor is formed, a bank formed on the substrate providing a boundary for a pixel region, a first electrode formed on the substrate and electrically connected with the driving transistor, the first electrode comprising a first and second cross sectional area both oriented in a direction perpendicular to a vertical direction of the substrate, the first area adjacent to the bank, the second area surrounded by the first area, an organic layer formed on the first electrode within the boundary provided by the bank, and a second electrode formed on the organic layer, wherein during operation of the OLED a first electric field between the first area of the first electrode and the second electrode is greater than a second electric field between the second area of the first electrode and the second electrode.