OLED Display Structure With Auxiliary Layer for Color Purity
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Solution Overview
Problem
Existing display devices face issues with color deviation and light emission through non-emissive areas, which affect image quality and efficiency.
Innovation Solution
A display device design incorporating a substrate with emissive and non-emissive areas, a reflective electrode, and an auxiliary layer in the non-emissive area, along with a common light-emitting layer and a cathode electrode, enhances light extraction efficiency and reduces lateral leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If light is emitted through the bank in the non-emissive area, then the display device can be simpler in structure, but color deviation occurs and image quality deteriorates
Solution Approach 1:
A black matrix layer is introduced as an intermediary component between the bank and the external environment in the non-emissive area. This black matrix selectively absorbs light that would otherwise pass through the bank, preventing color deviation while maintaining the overall structural simplicity of the display device.
Solution Approach 2:
The black matrix is applied locally only in the non-emissive area surrounding the emissive area, rather than uniformly across the entire display. This localized application addresses the color deviation problem specifically where it occurs without adding unnecessary complexity to the emissive regions.
2Illumination intensity
If light extraction efficiency is increased in the non-emissive area, then luminance improves, but light leakage through the bank causes color deviation
Solution Approach 1:
The black matrix serves as a light-absorbing intermediary that intercepts light in the non-emissive area before it can pass through the bank and cause color deviation. This allows the display to maintain high luminance in emissive areas while preventing color accuracy issues in non-emissive areas.
Solution Approach 2:
The potential harmful effect of light leakage through the bank in the non-emissive area is converted into a benefit by using the black matrix to absorb this light. The light that would otherwise cause color deviation is now utilized to enhance the contrast and definition between emissive and non-emissive regions.
3Manufacturing precision
If the non-emissive area is reduced to improve resolution, then image sharpness improves, but light leakage through the bank becomes more significant
Solution Approach 1:
The black matrix is positioned as an intermediary layer that specifically targets and absorbs light in the non-emissive area. This allows for reduced non-emissive area size to achieve higher resolution while the black matrix compensates by preventing light leakage through the bank, thereby maintaining image sharpness without the harmful light leakage effect.
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
Improves light extraction efficiency and reduces color deviation by utilizing microcavity characteristics and auxiliary layers, resulting in higher luminance and sharper images.
Implementation Method 1
a reflective electrode on the substrate
Implementation Method 2
an auxiliary layer on the reflective electrode... the auxiliary layer is disposed in the non-emissive area
Data Source
AI summary
A display device according to an example includes a substrate having an emissive area and a non-emissive area, a reflective electrode on the substrate, an auxiliary layer on the reflective electrode, and an organic light-emitting element on the reflective electrode and the auxiliary layer. The auxiliary layer is disposed in the non-emissive area.