OLED Panel Multilayer Inorganic Film Packaging Structure
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Solution Overview
Problem
Current OLED panels with a packaging structure of inorganic film layer-organic film layer-inorganic film layer exhibit poor performance in blocking external water and oxygen, which negatively affects the light emitting efficiency.
Innovation Solution
A thin film packaging structure comprising multiple inorganic film layers with specific refractive indices and thicknesses is used to cover the organic light emitting layer, including a first inorganic film layer with a higher refractive index than the first organic film layer, and second, third, and fourth inorganic film layers with refractive indices lower than the third, to enhance light emitting efficiency while maintaining water and oxygen resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a single inorganic film layer is used for packaging, then water and oxygen blocking performance is improved, but light emitting efficiency deteriorates due to high reflectivity
Solution Approach 1:
The single inorganic film layer is segmented into multiple inorganic film layers with alternating high and low refractive indices. This segmentation allows the structure to simultaneously achieve effective water and oxygen blocking while reducing overall light reflectivity through the alternating refractive index pattern, thereby improving light emitting efficiency.
Solution Approach 2:
The patent uses composite material structure by combining inorganic film layers with different refractive indices (high refractive index layers and low refractive index layers) to create a multilayer packaging structure. This composite approach enables the system to achieve both protective function (water and oxygen blocking) and optical optimization (reduced reflectivity) that cannot be achieved with a single material.
2Loss of energy
If multiple inorganic film layers with alternating refractive indices are used, then light emitting efficiency is improved by reducing reflectivity, but device complexity increases
Solution Approach 1:
The patent optimizes specific parameters of the multilayer structure including the refractive index values of each layer, the thickness of each film layer, and the number of alternating high and low refractive index layers. By carefully controlling these parameters, the structure achieves effective light management with reduced reflectivity while keeping the complexity manageable through systematic parameter optimization rather than arbitrary design.
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
The multilayer inorganic film structure improves light emitting efficiency by reducing light loss and maintaining effective water and oxygen resistance, increasing the OLED panel's performance beyond prior art.
Implementation Method 1
a refractive index of the first inorganic film layer is greater than a refractive index of the first organic film layer; a refractive index of the second inorganic film layer and a refractive index of the fourth inorganic film layer are both smaller than a refractive index of the third inorganic film layer
Data Source
AI summary
The present disclosure discloses an OLED panel and an OLED display. The OLED panel includes an OLED device and a thin film packaging structure formed on the OLED device. The thin film includes a first inorganic film layer, a first organic film layer, a second inorganic film layer, a third inorganic film layer and a fourth inorganic film layer set in sequence. The refractive index of the first inorganic film layer is greater than that of the first organic film layer, and the refractive index of the second inorganic film layer and the refractive index of the fourth inorganic film layer are both smaller than that of the third inorganic film layer. The light emitting efficiency of the OLED panel can be improved based on above structure of the OLED panel.