Transparent Metal Oxide Electrode for OLED Resonant Cavity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional organic electroluminescence display panels require multiple fine metal masks (FMMs) for achieving resonant cavity effects, leading to high manufacturing costs and complex processes due to the need for precise alignment and multiple FMM uses, which is not cost-effective and complicates the manufacturing process without improving efficiency and color saturation.
Innovation Solution
Incorporating a second electrode layer made of transparent metal oxide conductive material with a thickness greater than 300 nm, which allows for adjustment to comply with the wavelengths of red, green, and blue light, reducing the need for multiple FMMs and simplifying the manufacturing process by maintaining high transparency and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple fine metal masks (FMMs) are used to achieve resonant cavity effects, then efficiency and color saturation are improved, but manufacturing cost increases and manufacturing process becomes complex
Solution Approach 1:
The patent changes the material parameter of the electrode layer from conventional metal to transparent metal oxide conductive material, and adjusts the thickness parameter to greater than 300 nm. This parameter change allows the electrode layer itself to provide the resonant cavity effect, eliminating the need for multiple FMMs and simplifying the manufacturing process while maintaining efficiency and color saturation.
Solution Approach 2:
The transparent metal oxide conductive material layer serves multiple functions simultaneously: it acts as the electrode layer for electrical conduction, provides the resonant cavity structure for optical enhancement, and maintains high transparency. This multi-functionality consolidates what would otherwise require separate components (electrode + multiple FMMs), reducing manufacturing complexity.
2Illumination intensity
If multiple fine metal masks (FMMs) are used to achieve resonant cavity effects, then efficiency and color saturation are improved, but manufacturing cost increases
Solution Approach 1:
By changing the material to transparent metal oxide and increasing thickness to >300 nm, the electrode layer itself becomes the resonant cavity structure. This eliminates the need for expensive multiple FMM fabrication and alignment processes, significantly reducing manufacturing cost while maintaining the resonant cavity effects needed for efficiency and color saturation.
Solution Approach 2:
The invention extracts the resonant cavity function from the traditional FMM structure and integrates it directly into the electrode layer. This eliminates the separate FMM component and its associated high manufacturing costs, while preserving the optical enhancement benefits.
3Device complexity
If transparent metal oxide conductive material with thickness greater than 300 nm is used, then the number of FMMs is reduced and manufacturing is simplified, but maintaining high transparency and optical performance becomes challenging
Solution Approach 1:
The patent identifies transparent metal oxide conductive material with thickness >300 nm as the optimal parameter range. This specific parameter change achieves the right balance: thick enough to provide structural integrity and resonant cavity effect, yet the material's inherent transparency properties ensure optical performance is maintained. This parameter optimization allows single-layer implementation without compromising transparency.
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 use of a thick transparent metal oxide conductive material in the second electrode layer enables satisfactory efficiency and color saturation while reducing the number of FMMs required, lowering production costs and simplifying the manufacturing process by ensuring the optical thickness of each pixel area aligns with the respective light wavelengths.
Implementation Method 1
a top emissive OLED can have high efficiency and high color saturation because the top emissive OLED achieves significant resonant cavity effects
Implementation Method 2
an organic layer including a light-emitting layer made of organic light-emitting material
Data Source
AI summary
An organic electroluminescence display panel that includes a plurality of first pixel areas, a plurality of second pixel areas, and a plurality of third pixel areas is provided. The organic electroluminescence display panel includes a first electrode layer, an organic layer including a light-emitting layer made of organic light-emitting material and a second electrode layer. The first electrode layer includes a reflective material. The organic layer is located on the first electrode layer. The second electrode layer is located on the organic layer. The material of the second electrode layer includes a transparent metal oxide conductive material. The thickness of the second electrode layer is a single thickness and is greater than 300 nm.