Microstructure Packaging Layer for Low-Reflectivity OLED Panels
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Solution Overview
Problem
OLED display panels face high reflectivity issues on their surfaces, which negatively impact display brightness and require increased power consumption to compensate.
Innovation Solution
A packaging structure with an inorganic and organic layer laminated on a substrate, featuring a microstructure layer with protrusion structures and a planarization layer of different refractive indices, designed to reduce reflectivity by guiding light between protrusion structures and avoiding total reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional packaging layers are used on OLED display panels, then the manufacturing process is simple, but the surface reflectivity is high which reduces display brightness and increases power consumption
Solution Approach 1:
The packaging layer is segmented into multiple functional layers: inorganic packaging layer (first and second layers), organic packaging layer, microstructure layer with protrusion structures, and planarization layer. This segmentation allows each layer to perform specific functions, particularly the microstructure layer which creates optical paths to reduce reflectivity and improve brightness without increasing power consumption
Solution Approach 2:
The microstructure layer acts as an intermediary between the inorganic packaging layer and the planarization layer. It features protrusion structures that guide light and reduce total internal reflection, serving as an optical mediator that improves brightness while the planarization layer maintains a flat outer surface for device integration
2Illumination intensity
If microstructure layer with protrusion structures is added to reduce reflectivity, then display brightness is enhanced, but the device structure becomes more complex
Solution Approach 1:
The microstructure layer combines multiple functions: it serves as part of the packaging structure, provides optical guidance through protrusion structures to reduce reflectivity, and works with the planarization layer to maintain surface flatness. This merging of functions reduces the need for separate components and simplifies the overall device structure despite the added optical functionality
Solution Approach 2:
The protrusion structures are strategically positioned within the microstructure layer with specific spacing and dimensions. The local structural variation in the microstructure layer creates the optical effects needed for reduced reflectivity, while the planarization layer restores uniformity at the surface, achieving local optimization without global complexity
3Illumination intensity
If multiple laminated layers with different refractive indices are used to reduce reflectivity, then optical performance is improved, but the film thickness increases
Solution Approach 1:
Instead of increasing thickness to improve optical performance, the invention uses the microstructure layer to create vertical protrusion structures that manipulate light in the optical dimension. The protrusion structures guide light through total internal reflection principles, achieving reduced reflectivity through spatial light manipulation rather than increased path length, thus maintaining ultra-thin profile
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
Enhances display brightness without increasing power consumption by reducing reflectivity and simplifying the preparation process, while enabling an ultra-thin design through reduced film thickness.
Implementation Method 1
designed to reduce reflectivity by guiding light between protrusion structures and avoiding total reflection
Implementation Method 2
avoiding total reflection
Implementation Method 3
a refractive index of the planarization layer being lower than that of the microstructure layer
Data Source
AI summary
Provided is a packaging structure, including an inorganic packaging layer and an organic packaging layer that are laminated on a substrate, wherein the organic packaging layer includes a microstructure layer and a planarization layer, a refractive index of the planarization layer being lower than that of the microstructure layer; wherein the microstructure layer includes a base structure on the inorganic packaging layer and a plurality of protrusion structures spaced apart on a surface of the base structure away from the inorganic packaging layer; and the planarization layer fills at least gaps between adjacent protrusion structures, and a side of the planarization layer away from the inorganic packaging layer is of a planar structure.