Organic Light Emitting Display Device with Overlapping Emission Layers
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Organic light emitting display devices face challenges in achieving high-purity color expression and side visibility, particularly when one or more emitting layers do not properly emit specific colors, leading to deteriorated color representation and reduced side visibility when viewed from the side.
Innovation Solution
The device incorporates multiple organic light emitting layers with different emitting materials positioned strategically on anodes to ensure proper color emission and visibility, with the second and third organic light emitting layers extending from their respective anodes to overlap partially with the first layer, allowing for direct contact and improved color correction and side visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple emitting layers with different materials are used to improve color purity and side visibility, then color representation is improved, but device structure becomes more complex
Solution Approach 1:
The device is divided into multiple emitting regions (first, second, and third emitting regions) with different organic light emitting layers (first, second, and third organic light emitting layers) containing different emitting materials. Each layer is positioned on specific anodes (first anode, second anode, third anode) to emit different colors, achieving high color purity through spatial segmentation of emission functions.
Solution Approach 2:
Different organic light emitting layers with specific emitting materials are placed in different local regions (different emitting regions) of the device. The first organic light emitting layer is positioned on the first anode in the first emitting region, the second organic light emitting layer on the second anode in the second emitting region, and the third organic light emitting layer on the third anode in the third emitting region, allowing each region to have optimized local emission characteristics.
2Reliability
If emitting layers are positioned to extend and overlap for improved side visibility, then visibility is improved, but manufacturing precision requirements increase
Solution Approach 1:
The organic light emitting layers are configured to extend not only in the planar direction but also in the thickness direction of the substrate. The layers extend from the substrate surface toward the opposite surface, creating a three-dimensional emission structure that improves side visibility by allowing light emission from multiple angular directions, not just perpendicular to the substrate.
Solution Approach 2:
The organic light emitting layers are positioned to overlap with each other in the thickness direction. The first organic light emitting layer overlaps with the second organic light emitting layer, which in turn overlaps with the third organic light emitting layer, creating a nested arrangement that enhances side visibility while managing the complexity of layer positioning.
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 enhances color purity and side visibility by adjusting the resonance distance and emission efficiency, ensuring accurate color representation and improved light emission characteristics.
Implementation Method 1
In operation, electrons and holes generated by the anode and the cathode recombine in the emitting layer to emit light
Data Source
AI summary
An organic light emitting display device includes a substrate with a first emitting region adjacent a second emitting region, a first anode in the first emitting region, a first organic light emitting layer on the first anode, a second anode in the second emitting region, and a second organic light emitting layer on a part of the first anode and the second anode. The second organic light emitting layer includes a material different from the first organic light emitting layer.