OLED Composite Electrode Microcavity Thickness Optimization
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Solution Overview
Problem
Conventional OLED display devices face limitations in luminous efficiency and brightness due to wide luminescent bands of OLED materials, resulting in low color purity and contrast, and have complex manufacturing processes with high costs and low production efficiency.
Innovation Solution
An OLED array substrate with subpixel units featuring composite electrodes, organic material functional layers, and first electrodes forming microcavity structures of different thicknesses, optimized for red, green, and blue subpixels, simplifying the manufacturing process and improving color purity and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional OLED materials with wide luminescent bands are used, then the device structure and manufacturing process remain simple, but the color purity and contrast are low
Solution Approach 1:
The patent uses composite electrodes consisting of multiple layers (reflecting layer, microcavity adjustment layers, and transparent conductive layers) with different optical properties. This composite structure enables precise control of light emission characteristics, achieving high color purity and contrast while maintaining manufacturing feasibility through established sputtering and evaporation techniques.
Solution Approach 2:
The patent implements different composite electrode structures for different color subpixels (red, green, blue), with each subpixel having specifically optimized layer thicknesses and material compositions. This local optimization allows each color to achieve its optimal emission characteristics, thereby improving overall color purity and contrast without requiring complete redesign of the entire display structure.
2Power
If conventional OLED structures are used, then the manufacturing process is simple, but the luminous efficiency and brightness are limited
Solution Approach 1:
The patent optimizes the thickness parameters of each layer in the composite electrode structure (reflecting layer thickness, microcavity adjustment layer thicknesses, transparent conductive layer thickness) to achieve resonant enhancement of light emission. By precisely controlling these dimensional parameters, the device achieves higher luminous efficiency and brightness through constructive interference of light waves within the microcavity structure.
Solution Approach 2:
The patent incorporates microcavity adjustment layers that can be dynamically optimized during the manufacturing process. The multi-layer structure allows for flexible adjustment of optical path lengths and resonance conditions, enabling dynamic optimization of luminous efficiency for different operating conditions and color requirements without fundamentally changing the overall device architecture.
3Manufacturing precision
If different thickness composite electrodes are implemented for color optimization, then color purity and intensity improve, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the electrode structure into multiple functional segments (reflecting layer, first microcavity adjustment layer, second microcavity adjustment layer, transparent conductive layer), where each segment can be independently manufactured and optimized. This segmentation allows for precise control of color intensity for each subpixel while using standardized manufacturing processes for each layer type, thereby reducing overall manufacturing complexity despite the increased precision requirements.
Solution Approach 2:
The patent designs the composite electrode structure with universal layers that serve multiple functions: the reflecting layer provides both structural support and optical reflection; the microcavity adjustment layers simultaneously control resonance conditions and act as barriers; the transparent conductive layers provide both electrical conduction and optical transparency. This multi-functionality reduces the total number of manufacturing steps while achieving precise color intensity control.
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 solution enhances the color purity and intensity of light emitted by OLEDs, reduces manufacturing complexity and costs, and increases production efficiency and yield.
Implementation Method 1
the composite electrode, the organic material functional layer and the first electrode in a same subpixel unit constitute a microcavity structure
Data Source
AI summary
An organic light-emitting diode (OLED) array substrate, a display device and a manufacturing method thereof are disclosed. The array substrate includes: a substrate and pixel units disposed on the substrate. Each pixel unit includes a plurality of subpixel units; each subpixel unit includes a composite electrode, an organic material functional layer and a first electrode sequentially disposed on the substrate; thicknesses of the composite electrodes of different subpixel units are different; and the composite electrode, the organic material functional layer and the first electrode in a same subpixel unit constitute a microcavity structure.