Organic EL Pixel Resonant Structure for View Angle and Power
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing white+CF system organic electroluminescent display apparatuses suffer from low light-output efficiency and poor view angle characteristics due to suboptimal interference structures and power consumption issues.
Innovation Solution
A light-emitting apparatus with different interference orders for its pixels, featuring a thicker electrode-protective layer in the blue-light-emitting pixel to enhance view angle characteristics, and a resonant structure that includes optical adjustments to optimize light emission, reducing power consumption while maintaining color balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a white+CF system is used with standard interference structures, then manufacturing yield is improved through evaporation deposition, but light-output efficiency deteriorates due to suboptimal optical resonance
Solution Approach 1:
The patent optimizes the thickness parameters of the electrode-protective layer and organic compound layer to achieve optimal optical resonance conditions. By precisely controlling these layer thicknesses (e.g., electrode-protective layer: 5-20 nm, organic compound layer: 50-150 nm), the system achieves enhanced light output efficiency while maintaining the manufacturing advantages of the white+CF system
Solution Approach 2:
The patent introduces different interference orders for different color pixels (R, G, B) to dynamically optimize optical resonance for each wavelength. This allows each pixel type to operate at its optimal resonance condition, improving overall light-output efficiency while maintaining compatibility with the evaporation deposition process
2Use of energy by moving object
If interference structures are optimized for blue-light-emitting pixels, then power consumption is reduced, but view angle characteristics deteriorate due to different interference orders
Solution Approach 1:
The patent applies different electrode-protective layer thicknesses to different pixel types based on their specific interference order requirements. Blue pixels receive thicker electrode-protective layers (5-20 nm) optimized for their higher interference order, while red and green pixels have thinner layers, allowing each pixel type to achieve optimal performance for its wavelength and interference order
Solution Approach 2:
The patent deliberately creates asymmetric layer thickness configurations across different pixel types to match their different interference orders. This asymmetric design ensures that each pixel type operates at its optimal resonance condition, simultaneously improving power efficiency and maintaining consistent view angle characteristics across all colors
3Reliability
If a coating layer is added to protect the first electrode, then corrosion resistance is improved, but reflectance deteriorates in the light-emitting region
Solution Approach 1:
The patent carefully controls the thickness of the electrode-protective layer (5-20 nm) to find the optimal balance between corrosion protection and optical reflectance. This thin protective layer provides sufficient corrosion resistance while minimizing its impact on the optical resonance and reflectance of the first electrode
Solution Approach 2:
The patent uses composite material structures where the electrode-protective layer is formed as a thin coating on the first electrode. This composite structure combines the corrosion resistance of the protective layer with the high reflectance properties of the underlying electrode, achieving both protection and optical performance
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 achieves high view angle characteristics and reduced power consumption by employing a thicker electrode-protective layer in the blue-light-emitting pixel and a resonant structure, resulting in improved light-output efficiency and compatibility between view angle and power consumption.
Implementation Method 1
An organic electroluminescent element is an element including a pair of electrodes and an organic compound layer disposed therebetween
Implementation Method 2
a pair of electrodes constitutes a reflective electrode having a metal reflective layer and a transparent electrode
Implementation Method 3
a system in which a white organic electroluminescent element and a color filter are used
Data Source
AI summary
The present disclosure provides a light-emitting apparatus including a plurality of types of light-emitting pixels, each of the light-emitting pixels including a reflective electrode, an electrode-protective layer, an organic compound layer containing a light-emitting layer, and a light-output electrode in this order and having a resonator structure, wherein at least one type of the plurality of types of light-emitting pixels is a light-emitting pixel having a greater interference order than other types of light-emitting pixels, and the electrode-protective layer of the light-emitting pixel having the greater interference order has a greater layer thickness than the electrode-protective layers of the other types of light-emitting pixels.