OLED Panel Silicon Compound Layer Stack for Higher Light Efficiency
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Solution Overview
Problem
The manufacturing process of organic light emitting display panels is complex and costly due to the need for multiple layers with specific refractive indices and thicknesses, which complicates the formation of layers with silicon compounds.
Innovation Solution
The use of a lower layer with sequentially laminated silicon compound layers, including a second layer with a lower refractive index and a third layer with a higher refractive index, formed through the same process, simplifies the manufacturing by allowing continuous formation in the same chamber, reducing processing time and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple layers with specific refractive indices and thicknesses are formed to improve light efficiency, then the manufacturing process becomes complex and costly
Solution Approach 1:
The patent combines multiple silicon compound layers (second layer with lower refractive index and third layer with higher refractive index) into a single integrated structure that can be formed through the same manufacturing process, eliminating the need for separate processing steps while maintaining the optical performance benefits of multiple layers with different refractive indices
2Illumination intensity
If multiple layers with specific refractive indices and thicknesses are formed to improve light efficiency, then processing time and cost increase
Solution Approach 1:
The patent merges the formation of the second layer and third layer into a single continuous manufacturing process step, allowing both layers to be deposited simultaneously or sequentially in the same chamber without breaking the vacuum or changing processing conditions, thereby reducing total processing time while maintaining the optical functionality of having distinct layers with different refractive indices
3Ease of manufacture
If traditional methods with additional layers like lithium fluoride are used, then manufacturing steps increase, but this patent achieves equivalent performance with fewer layers
Solution Approach 1:
The patent changes the material parameters by using silicon compounds with different refractive indices (silicon oxide for the second layer and silicon oxynitride or silicon nitride for the third layer) instead of traditional materials like lithium fluoride, achieving the same optical performance through parameter substitution that simplifies the manufacturing process
Solution Approach 2:
The patent employs composite material structure using silicon oxide and silicon oxynitride/silicon nitride layers, where the combination of these two materials with different refractive indices creates the desired optical performance without requiring additional layers, demonstrating how composite materials can replace more complex multi-layer structures
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 improves light efficiency and extends the luminance and color life of the display panel while simplifying the manufacturing process, achieving equivalent or superior performance to traditional methods without the need for additional layers like lithium fluoride.
Implementation Method 1
An optical path of the second layer is defined by a product of a refractive index of the second layer and the thickness of the second layer
Data Source
AI summary
An organic light emitting display panel including a first electrode, a second electrode on the first electrode, an organic layer between the first electrode and the second electrode and including at least one light emitting layer, an organic cover layer disposed on the second electrode, a lower layer between the organic cover layer and the second electrode and including a first layer, a second layer, and a third layer, which are different from each other and are sequentially stacked, and an upper layer on the organic cover layer. The first layer contacts the second electrode. The second layer and the third layer each include a silicon compound.