Transparent OLED Anode with Hollow Reflective Electrode
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Solution Overview
Problem
Conventional top-emitting OLED display panels struggle to achieve transparency due to the need for a thick metal reflective layer, which prevents light from penetrating the organic light-emitting layer.
Innovation Solution
A transparent OLED display panel design featuring a substrate with sub-pixels comprising an anode structure that includes a first transparent electrode, a reflective electrode with a hollow center, and a second transparent electrode, allowing light to pass through while maintaining reflectivity, using ITO for the transparent electrodes and silver for the reflective electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a thick metal reflective layer is used to improve reflectivity, then reflectivity is improved, but light penetration is blocked and transparency is lost
Solution Approach 1:
The anode is segmented into three distinct layers: a first transparent electrode, a reflective electrode with a hollow area at its center, and a second transparent electrode. This segmentation allows different parts of the anode to perform different functions - the reflective electrode provides reflectivity while the hollow area and transparent electrodes enable light penetration for transparency.
Solution Approach 2:
The reflective electrode is designed with a hollow area at its center, creating local quality variation. The reflective electrode material (such as silver) is selectively positioned to provide reflectivity only where needed, while the hollow area allows light to pass through. This local differentiation resolves the contradiction between reflectivity and light penetration.
2Illumination intensity
If a conventional sandwich structure with metal reflective layer is used, then reflectivity is improved, but device complexity increases and transparency cannot be achieved
Solution Approach 1:
The invention merges multiple functions into a single integrated anode structure. The anode combines transparent electrode functions (electrical conduction and light transmission) with reflective electrode functions (light reflection) in one unified component, eliminating the need for separate reflective layers and simplifying the overall device structure while maintaining both transparency and reflectivity.
Solution Approach 2:
The anode uses composite material structure combining transparent electrode materials (such as ITO) and reflective electrode materials (such as silver). This composite approach allows the anode to simultaneously exhibit transparent and reflective properties, achieving both transparency and high reflectivity without increasing device complexity.
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 design enables transparent displays with a simple and stable structure, high yield rate, and low production costs by allowing light to be emitted through the hollow area while maintaining reflectivity, thus achieving transparency and reducing production expenses.
Implementation Method 1
a reflective electrode stacked on the first transparent electrode, the reflective electrode forming a hollow area at the center... allowing light to pass through while maintaining reflectivity
Implementation Method 2
The light-emission principle behind the OLED display device is as follows: under certain voltage driving, electrons and holes are injected from the cathode and the anode into the electron injection layer and the hole injection layer respectively. The electrons and the holes migrate through the electron transport layer and the hole transport layer to the light emitting layer respectively, and meet in the light emitting layer to form excitons to cause the light emitting molecules to excite, and the latter emits visible light by radiation relaxation.
Data Source
AI summary
The invention provides a transparent OLED display panel and manufacturing method thereof, the OLED display panel comprising: a transparent substrate and a plurality of sub-pixels disposed on the substrate arranged in an array; each sub-pixel comprising: an anode disposed on the substrate, an organic light-emitting layer disposed on the anode, and a transparent cathode disposed on the organic light-emitting layer; the anode comprising: a first transparent electrode, a reflective electrode stacked on the first transparent electrode, a second transparent electrode stacked on the reflective electrode, the reflective electrode forming a hollow area at the center; through forming hollow area on the reflective electrode of the anode, the light can be emitted simultaneously for the cathode and the hollow area to achieve transparent display with a simple and stable structure, high yield rate and low production cost.