OLED Standing Wave Anti-Node Positioning for Light Extraction
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Solution Overview
Problem
The solution process method for manufacturing organic light-emitting diode (OLED) sub-pixels has a limited printing process window due to restrictions in solution volume and layer thickness adjustments, affecting the performance of electroluminescent display panels, particularly in achieving optimal light-emitting layer positions for constructive interference.
Innovation Solution
The electroluminescent display panel design includes pixel units with sub-pixels where the light-emitting layer is positioned on anti-nodes of standing waves, allowing for increased printing process windows and improved light intensity by adjusting the thickness of layers such as hole injecting and transporting layers, and electron injecting and transporting layers, ensuring optimal light-emitting layer placement for constructive interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the solution process method is used to manufacture OLED sub-pixels, then the material utilization ratio is improved and manufacturing cost is reduced, but the printing process window is limited due to restrictions in solution volume and layer thickness adjustments
Solution Approach 1:
The patent applies parameter changes by systematically adjusting the thickness of hole injecting layer (30-70 nm), hole transporting layer (15-30 nm), electron injecting layer, and electron transporting layer to achieve optimal light-emitting layer positioning. This enables the light-emitting layer to be positioned on the anti-node of standing waves, maximizing constructive interference and light extraction efficiency while expanding the printing process window for solution-based manufacturing
2Illumination intensity
If the light-emitting layer thickness and position are adjusted to achieve optimal standing wave anti-node positioning, then light exiting efficiency is improved, but the layer thickness control precision requirement increases
Solution Approach 1:
The patent applies local quality by optimizing the thickness of specific functional layers (hole injecting layer: 30-70 nm, hole transporting layer: 15-30 nm) in different regions of the device structure. This localized optimization enables precise positioning of the light-emitting layer on the standing wave anti-node, achieving high light extraction efficiency through constructive interference while maintaining feasible manufacturing precision requirements
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 enhances the light exiting efficiency and intensity of red, green, and blue lights by positioning the light-emitting layers on anti-nodes of their respective standing waves, thereby improving the overall performance of the display device.
Implementation Method 1
the first color light forms a first standing wave in the first sub-pixel, the second color light forms a second standing wave in the second sub-pixel, the third color light forms a third standing wave in the third sub-pixel
Implementation Method 2
the light-emitting layer of the first sub-pixel is on a first anti-node of the first standing wave, the light-emitting layer of the second sub-pixel is on a second anti-node of the second standing wave, and the light-emitting layer of the third sub-pixel is on a second anti-node of the third standing wave
Implementation Method 3
different sub-pixels can be manufactured by a solution process method... organic light-emitting diode (OLED)... each of the sub-pixels comprising a first electrode, a light-emitting layer and a second electrode stacked in sequence
Data Source
AI summary
An electroluminescent display panel and a manufacturing method thereof, and a display device. Each of a plurality of pixel units included in the electroluminescent display panel includes a first sub-pixel, a second sub-pixel and a third sub-pixel, respectively, each of the sub-pixels includes a first electrode, and a light-emitting layer, respectively, taking a planar surface of the first electrode facing the light-emitting layer as a reference plane, the light-emitting layer of the first sub-pixel is on a first anti-node of a first standing wave, the light-emitting layer of the second sub-pixel is on a second anti-node of a second standing wave, and the light-emitting layer of the third sub-pixel is on a second anti-node of a third standing wave.