OLED Resonance Layer Structure for Low-Loss Light Extraction
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Solution Overview
Problem
Organic light emitting display devices suffer from low light efficiency due to significant light dissipation when light generated from the emission layer is discharged through the encapsulation layer, which consists of alternately laminated inorganic and organic layers, leading to inefficient light extraction.
Innovation Solution
Incorporating a light extraction reduction preventing layer with a lower refractive index between the display unit and the encapsulation layer, and a capping layer with a high refractive index, to establish a resonance condition that minimizes light dissipation and enhances light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an encapsulation layer with alternately laminated inorganic and organic layers is used to protect the display unit, then the display unit is protected from oxygen and moisture, but light dissipation increases and light extraction efficiency decreases
Solution Approach 1:
A light extraction enhancement layer is introduced as an intermediary component between the display unit and the encapsulation layer. This layer has a refractive index specifically designed to be lower than both the display unit and the encapsulation layer, creating optimal refractive index contrast that enhances light extraction efficiency while maintaining the protective function of the encapsulation layer
Solution Approach 2:
The refractive index parameter of the light extraction enhancement layer is specifically optimized to be lower than both the display unit and encapsulation layer. This parameter change creates the necessary optical conditions for improved light extraction, transforming the optical properties of the system without affecting the protective function
2Device complexity
If the encapsulation layer is disposed directly on the display unit, then the structure is simple, but light extraction efficiency is poor due to insufficient resonance condition
Solution Approach 1:
The light extraction enhancement layer serves as a mediator that enables the resonance condition between the display unit and encapsulation layer. By positioning this layer with appropriate refractive index properties between the two components, it facilitates optical resonance that significantly improves light extraction efficiency
Solution Approach 2:
The patent utilizes optical resonance, which is analogous to mechanical vibration principles, to enhance light extraction. The light extraction enhancement layer creates resonant optical fields that improve the extraction of light from the display unit, similar to how resonance enhances vibrational energy transfer
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 effectively reduces light dissipation and improves light emission efficiency by creating a refractive index difference that facilitates resonance, thereby enhancing the overall light extraction efficiency of the organic light emitting display device.
Implementation Method 1
establish a resonance condition that minimizes light dissipation and enhances light emission efficiency
Implementation Method 2
creating a refractive index difference that facilitates resonance
Data Source
AI summary
An organic light emitting display device including a light extraction reduction preventing layer disposed between a display unit disposed on a substrate and an encapsulation layer for protecting the display unit, which improves light emission efficiency by reducing an amount of light dissipating while light generated from an emission layer of the display unit is extracted to the outside.