OLED Second Electrode Segmentation for Adhesion and Conductivity
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Solution Overview
Problem
The reliability and luminous efficiency of organic light emitting diode (OLED) display devices are compromised due to poor adhesion between electrodes and the organic light emitting layer, which affects the overall performance and conductivity of the electrodes.
Innovation Solution
The OLED display device features a second electrode with two portions, where the ratios of an alkaline earth element to silver differ between the portions, enhancing adhesion and conductivity while improving luminous efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single uniform electrode structure is used, then the device structure is simple, but the adhesion between electrode and organic light emitting layer is poor
Solution Approach 1:
The electrode is divided into two distinct portions: a first portion in contact with the organic light emitting layer and a second portion extending toward the substrate. This segmentation allows each portion to have optimized properties for its specific function, with the first portion providing superior adhesion to the organic layer while the second portion maintains structural integrity and conductivity.
Solution Approach 2:
Different portions of the electrode are assigned different material compositions tailored to their local requirements. The first portion contains materials optimized for bonding with the organic light emitting layer, while the second portion has composition optimized for electrical conductivity and mechanical support, creating local quality variations that resolve the adhesion problem without unnecessary overall complexity.
2Productivity
If conventional electrode structure is used, then manufacturing is simple, but luminous efficiency is reduced
Solution Approach 1:
The electrode is segmented into functionally distinct first and second portions, where the first portion optimizes charge injection into the organic light emitting layer for improved luminous efficiency, while the second portion provides structural and conductive support. This segmentation enables performance optimization without requiring completely new device architectures.
Solution Approach 2:
Different regions of the electrode are given different material properties optimized for their specific functions. The first portion has composition and structure optimized for charge injection and luminous efficiency, while the second portion has properties optimized for conductivity and mechanical stability, allowing high luminous efficiency to be achieved through localized optimization rather than overall structural complexity.
Data Source
Figure 1
Figure 2~3
Figure 4A~4B
AI summary
An organic light emitting diode (OLED) display device is provided. The organic light emitting diode display device comprises a first substrate, a first electrode, an organic light emitting layer, a second electrode, and a second substrate. The first electrode is disposed on the first substrate. The organic light emitting layer is disposed on the first electrode. The second electrode is disposed on the organic light emitting layer. The second substrate is located on the second electrode. The material of the second electrode comprises an alkaline earth element and silver. The second electrode comprises a first portion and a second portion, and the first portion is located between the second portion and the first substrate. The ratios of the alkaline earth element to silver in the first portion and in the second portion are different.