Multi-Layer OLED Structure with Shared Anodes for Enhanced Brightness
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Solution Overview
Problem
Active matrix OLEDs face challenges in improving light-emitting efficiency and brightness due to limitations in the number of organic layers formed using the wet method, which restricts their application in large-area screens and high-resolution devices.
Innovation Solution
A display device structure is developed with multiple light-emitting layers, where a first anode is connected to a thin film transistor, and a second anode is formed on top of the first organic layer, with a second organic layer and cathode configuration that allows for improved light emission by sharing a common voltage and eliminating the need for additional insulating layers, enhancing efficiency and brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the wet method is used to form organic layers in OLED, then material usage is reduced and large area screens can be fabricated, but the number of organic layers is limited which restricts improvement of efficiency and brightness
Solution Approach 1:
The organic layer is divided into multiple segments (first organic layer with first light-emitting layer, second organic layer with second light-emitting layer) that can be formed separately using the wet method. Each segment is deposited on successive anodes (first anode, second anode) and can be independently controlled, allowing multiple light-emitting layers to coexist while maintaining the advantages of wet deposition for large area fabrication.
2Productivity
If multiple organic layers are formed to improve efficiency and brightness, then light-emitting efficiency and brightness increase, but device complexity increases requiring additional anodes and organic layers
Solution Approach 1:
Multiple light-emitting layers (first light-emitting layer, second light-emitting layer) are merged into a single integrated structure where they share common electrodes (thin film transistor, cathode) and are electrically connected through successive anodes. This combining approach achieves enhanced light-emitting efficiency and brightness while minimizing the increase in device complexity by sharing common components rather than completely independent structures.
3Stability of the object's composition
If additional insulating layers are added to support multiple organic layers, then structural stability is improved, but manufacturing complexity and process steps increase
Solution Approach 1:
The unnecessary insulating layer (second insulating layer) is extracted or removed from the structure. Instead of adding multiple insulating layers to support multiple organic layers, the invention uses the organic layers themselves (first organic layer, second organic layer) as both functional light-emitting components and structural support elements, eliminating the need for additional insulating layers and simplifying the manufacturing process.
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
The multi-layer configuration improves light-emitting efficiency and brightness, allowing for better performance in large-area and high-resolution displays without the need for additional insulating layers, thus overcoming the limitations of conventional OLEDs.
Implementation Method 1
a first organic layer is formed on the first anode comprising having a first light-emitting layer; a second organic layer is formed on the second anode comprising having a second light-emitting layer
Data Source
AI summary
A display device comprising: a thin film transistor formed on an insulating substrate; a first anode electrically connected to the thin film transistor; a first organic layer formed on the first anode and comprising a first light-emitting layer; a second anode formed on the first organic layer and electrically connected to the thin film transistor; a second organic layer formed on the second anode and comprising a second light-emitting layer; and a cathode formed on the second organic layer.