Luminescent Electron Transport Layer Reduces Shadow Masks
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Solution Overview
Problem
Conventional organic electroluminescent structures require multiple shadow masks for forming luminescent layers, leading to alignment deviations and manufacturing challenges, especially in larger panels, which affect display quality and efficiency.
Innovation Solution
Combining an electron transport layer with a luminescent layer to reduce the number of shadow masks needed, using an electron transport host with a luminescent dopant to generate primary color light and facilitate electron transport, thereby simplifying the manufacturing process and reducing alignment errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple shadow masks are used to form luminescent layers, then luminescent patterns can be formed, but alignment deviations occur and manufacturing complexity increases
Solution Approach 1:
The patent combines the electron transport layer and luminescent layer into a single integrated layer structure. The electron transport layer serves dual functions: transporting electrons and providing luminescence through dopant materials. This merging eliminates the need for separate luminescent layers, thereby reducing the number of shadow masks from three to two while improving alignment precision between layers.
Solution Approach 2:
The electron transport layer is designed to perform multiple functions simultaneously: it transports electrons through the device and generates luminescence through energy transfer to dopant materials. This multi-functionality allows a single layer to replace what would traditionally require separate electron transport and luminescent layers, reducing manufacturing complexity and alignment requirements.
2Manufacturing precision
If three shadow masks are used for evaporation process, then full color luminescent matrix can be formed, but alignment deviation generates shadow effects reducing display quality
Solution Approach 1:
By merging the electron transport and luminescent functions into one layer, the patent reduces the number of evaporation steps and shadow masks required. Instead of three separate shadow masks for three luminescent layers, only two shadow masks are needed for the red and blue luminescent patterns, simplifying the manufacturing process and reducing alignment-related shadow effects.
3Area of stationary object
If large shadow masks are used for large panels, then full coverage is achieved, but bending effects and pattern conversion deviation occur
Solution Approach 1:
The integrated electron transport-luminescent layer structure reduces the number of shadow masks from three to two. This reduction is particularly beneficial for large panels where fewer, smaller shadow masks can be used, minimizing bending effects and pattern conversion deviations that occur with large shadow masks.
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 approach enhances device stability, improves luminescent efficiency, and eliminates the need for one shadow mask, minimizing alignment deviations and manufacturing complexities while maintaining power consumption and lifetime performance.
Implementation Method 1
an organic electroluminescent structure having a luminescent and electron transport layer that has both effects of the organic luminescence and electron transport
Data Source
AI summary
An organic electroluminescent structure has a first electrode, a first primary color luminescent patterned layer disposed on the first electrode, a second primary color luminescent patterned layer disposed on the first electrode, a third primary color luminescent and electron transport layer disposed on the first electrode, the first primary color luminescent patterned layer and the second primary color luminescent patterned layer, and a second electrode disposed on the third primary color luminescent and electron transport layer.