OLED Microcavity Insulating Layer Thickness Optimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing organic light emitting devices face challenges in achieving high luminance and color purity due to limitations in microcavity structures and wavelength interference, leading to inefficient light emission and power consumption.
Innovation Solution
The organic light emitting device incorporates a substrate with a circuit region, reflective metal layers, and an insulating layer with varying thicknesses, along with via plugs made of tungsten, to create a microcavity structure that enhances light interference and resonance, improving luminance and color purity by amplifying specific wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional microcavity structure with uniform insulating layer thickness is used, then the device structure is simple, but the luminance efficiency and color purity are insufficient due to inadequate wavelength interference control
Solution Approach 1:
The insulating layer is designed with different thicknesses in different regions (first, second, and third thicknesses corresponding to different subpixels). This local variation in thickness enables each region to selectively interfere with specific wavelengths of light, thereby improving luminance efficiency and color purity for each color channel (red, green, blue) without requiring complete structural redesign of the entire device.
2Manufacturing precision
If the insulating layer thickness is increased to enhance wavelength interference, then color purity improves, but the device height and manufacturing complexity increase
Solution Approach 1:
The patent optimizes the insulating layer thickness parameters (first, second, and third thicknesses) to specific ranges that enable effective wavelength interference while controlling device height. By carefully selecting these thickness parameters, the patent achieves high color purity without excessive increases in device dimensions, balancing optical performance with manufacturing feasibility.
3Productivity
If multiple reflective metal layers with varying insulating layer thicknesses are implemented, then light emission efficiency improves through enhanced interference, but the manufacturing process complexity increases
Solution Approach 1:
The device is segmented into multiple functional layers (circuit region, reflective metal layers, insulating layer with varying thickness, light emitting part) that can be manufactured separately and then integrated. This segmentation allows each layer to be optimized independently for its specific function while simplifying the overall manufacturing process compared to creating a monolithic complex structure.
Solution Approach 2:
The patent employs a nested structure where the insulating layer with different thicknesses is positioned between the reflective metal layers and the light emitting part. This nesting arrangement allows the insulating layer to perform wavelength-selective interference functions while being integrated within the broader microcavity structure, achieving enhanced light emission efficiency without requiring a complete restructuring of the device architecture.
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 configuration increases luminance efficiency and color purity by amplifying desired wavelengths through constructive interference, reducing power consumption and enhancing optical characteristics.
Implementation Method 1
create a microcavity structure that enhances light interference and resonance, improving luminance and color purity by amplifying specific wavelengths
Implementation Method 2
create a microcavity structure that enhances light interference and resonance, improving luminance and color purity by amplifying specific wavelengths
Implementation Method 3
reflective metal layers on the circuit region, the reflective metal layers including a first reflective metal layer, a second reflective metal layer and a third reflective metal layer spaced apart from each other
Data Source
AI summary
An OLED including a substrate; a circuit region; reflective metal layers on the circuit region and including first to third reflective metal layers spaced apart from each other; an insulating layer including first to third insulating regions covering upper surfaces of the reflective metal layers and having a first to third thicknesses that are different from one another; first to third via plugs penetrating through the insulating layer to contact the reflective metal layers, first electrodes in contact with the via plugs, and covering a portion of an upper surface of the insulating layer; an organic light emitting layer on the first electrodes; and a second electrode on the organic light emitting layer, wherein the first to third via plugs include tungsten.