OLED Panel Optical Coupling Layer Protrusion Structures
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Solution Overview
Problem
The external quantum efficiency of semiconductor light-emitting elements in OLEDs is limited by low light extraction efficiency, which hinders the reliability and power efficiency of these devices.
Innovation Solution
A method of manufacturing OLED display panels involves forming an anode, organic light-emitting layer, cathode, and first optical coupling layer on a substrate, followed by a second optical coupling layer with protrusion structures having arc-shaped surfaces on the side away from the cathode, using a mask plate with specific hole configurations to enhance light extraction by reducing total reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional planar optical coupling layer is used, then the device structure is simple and easy to manufacture, but the light extraction efficiency is low due to total internal reflection
Solution Approach 1:
The patent applies curvature by forming protrusion structures with arc-shaped surfaces on the optical coupling layer. These curved microstructures scatter light that would otherwise undergo total internal reflection, thereby improving light extraction efficiency while maintaining a relatively simple manufacturing process using conventional photolithography and etching techniques
Solution Approach 2:
The patent creates a microstructured surface with protrusion structures that have air gaps or voids between them. This porous-like structure reduces total internal reflection by providing multiple interfaces for light scattering, improving light extraction efficiency without significantly complicating the manufacturing process
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 increases light extraction efficiency and external quantum efficiency by scattering light that would otherwise be totally reflected, thereby improving the performance and reliability of OLEDs.
Implementation Method 1
This approach increases light extraction efficiency and external quantum efficiency by scattering light that would otherwise be totally reflected
Implementation Method 2
scattering light that would otherwise be totally reflected
Implementation Method 3
A first mask plate is used to implement evaporation on the first optical coupling layer to form a second optical coupling layer
Data Source
AI summary
An organic light-emitting diode (OLED) display panel and manufacturing method thereof. The method of manufacturing the OLED display panel comprises forming an anode (2), an organic light-emitting layer (3), a cathode (4) and a first optical coupling layer (5) sequentially on a substrate (1), and forming a second optical coupling layer (6) on a side, away from the cathode (4), of the first optical coupling layer (5) by arranging a plurality of protrusion structures with arc-shaped surfaces. Light that would be totally reflected from a surface of the first optical coupling layer are transmitted out through the protrusion structures with the arc-shaped surfaces of the second optical coupling layer, therefore the total reflection of the light is reduced, the light extraction efficiency is increased, and the external quantum efficiency of the device is improved.