OLED Emitting Layer Structure With a Common RGB Emission Layer
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Solution Overview
Problem
Existing organic EL display devices face challenges in improving performance without significantly increasing processing costs.
Innovation Solution
The device incorporates a blue, green, and red organic EL device structure with a common fourth emitting layer between the cathode and individual emitting layers, using specific compounds in the emitting layers to enhance performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a common fourth emitting layer is added to all pixels, then device performance is improved, but processing complexity increases
Solution Approach 1:
The fourth emitting layer is designed as a common layer that serves all pixel types (red, green, blue) simultaneously. This layer contains a second compound that can be utilized across different pixel configurations, allowing one layer to perform multiple functions and reducing the need for separate emitting layers for each pixel type.
Solution Approach 2:
The patent merges the fourth emitting layer into all pixel structures, combining what would traditionally be separate emitting layers into a unified common layer. This integration approach reduces processing steps while maintaining performance improvements through the shared fourth emitting layer.
2Use of energy by moving object
If specific compounds are used in emitting layers to enhance performance, then light emission efficiency improves, but manufacturing cost increases
Solution Approach 1:
The patent specifies particular chemical compounds (first compound with formula (1) containing group (11), second compound with formula (2)) with defined molecular structures and properties. By controlling the chemical parameters of the emitting layer materials, optimal light emission efficiency is achieved while maintaining manufacturability through established synthesis methods.
Solution Approach 2:
The emitting layers use composite material systems combining specific host materials with dopant compounds. The first emitting layer uses a first host material and first dopant, while the fourth emitting layer uses a second host material and second dopant. These composite structures enable enhanced light emission efficiency through synergistic material interactions.
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 improves the performance of the organic EL display device without substantially increasing processing costs, enhancing light emission efficiency and reducing production complexity.
Implementation Method 1
Holes are injected from the anode into the emitting layer, and electrons are injected from the cathode into the emitting layer. As a result of recombination of the holes and the electrons in the emitting layer, the organic EL device emits light.
Data Source
AI summary
An organic EL display device includes an anode and a cathode and includes a blue organic EL device, a green organic EL device, and a red organic EL device. The blue organic EL device includes a first emitting layer. The green organic EL device includes a second emitting layer. The red organic EL device includes a third emitting layer. The organic EL devices include a fourth emitting layer as a common layer. The fourth emitting layer is in direct contact with each of the emitting layers). The first emitting layer contains a compound represented by a formula (1) and having at least one group represented by a formula (11). The fourth emitting layer contains a second compound represented by a formula (2).