Metamaterial Layer for OLED Light Extraction
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Solution Overview
Problem
Organic light emitting display (OLED) devices face limitations in light emission efficiency due to light loss at non-fullly transparent electrodes, which restrict the enhancement of light emission efficiency.
Innovation Solution
Incorporating a metamaterial layer on the organic light emitting structures, comprising dielectric layers with nano wires and a coating layer, to amplify the intensity of light emitted at specific wavelengths, thereby increasing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent electrode is used in OLED device, then light can be emitted through the electrode, but light loss occurs due to incomplete transparency which limits light emission efficiency improvement
Solution Approach 1:
The patent introduces a metamaterial layer with specifically designed optical parameters (refractive index, thickness, pattern geometry) to control light propagation. By changing the optical parameters of the layer between organic light emitting structures and transparent electrode, the patent optimizes light extraction efficiency while minimizing losses at the transparent electrode interface
Solution Approach 2:
The patent employs a composite structure consisting of the metamaterial layer (with specific refractive index properties) combined with the transparent electrode. This composite approach allows the metamaterial layer to compensate for the imperfect transparency of the electrode, thereby reducing light loss and improving overall light emission efficiency
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 metamaterial layer enhances light emission efficiency by resonantly amplifying red, green, and blue color lights, effectively compensating color coordinates and reducing light loss, thus improving the overall light emission efficiency of OLED devices.
Implementation Method 1
the metamaterial layer enhances light emission efficiency by resonantly amplifying red, green, and blue color lights
Data Source
AI summary
An organic light emitting display device includes a first substrate, a thin film transistor disposed on the first substrate, a first electrode electrically coupled to the thin film transistor, a pixel defining layer disposed on the first substrate and the first electrode to define unit pixels, a plurality of organic light emitting structure disposed on the first electrode, where in the organic light emitting structure includes a first organic light emitting structure, a second organic light emitting structure and a third light emitting structure, a second electrode which covers the first through third organic light emitting structures and the pixel defining layer; a metamaterial layer disposed on the second electrode corresponding to the organic light emitting structures, an encapsulation member which covers the second electrode and the metamaterial layer, and a second substrate disposed on the encapsulation member opposite to the first substrate.