Quantum Dot Light-Emitting Layer for Efficient Light Release
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Solution Overview
Problem
Existing light-emitting devices face challenges in efficiently releasing light due to manufacturing issues with electrode patterning, such as defects and increased production costs, and inefficiencies in light distribution.
Innovation Solution
A light-emitting device with a light-emitting layer that includes regularly alternating regions of different thicknesses, area densities, or luminance intensities, arranged perpendicular to the substrate, utilizing quantum dots and dummy flakes or nanoparticles to diffract light efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the electrode is patterned to have a regular structure to increase light release efficiency, then light release efficiency is improved, but manufacturing complexity and production costs increase
Solution Approach 1:
The patent extracts the light management function from the electrode structure and relocates it to the light-emitting layer. By forming regions with different light emission characteristics directly in the light-emitting layer, the device achieves efficient light release without requiring complex electrode patterning, thus resolving the contradiction between light release efficiency and manufacturing complexity
Solution Approach 2:
The patent transitions from two-dimensional electrode patterning to three-dimensional light-emitting layer structuring. By creating vertical regions with different thicknesses or emission properties within the light-emitting layer, the device achieves light management functionality without the manufacturing challenges associated with fine electrode patterning
2Loss of energy
If the electrode is patterned at narrow pitches to improve light release efficiency, then light release efficiency is improved, but manufacturing precision requirements increase and defects may occur
Solution Approach 1:
The patent removes the light management function from the electrode patterning process and implements it directly in the light-emitting layer. This extraction eliminates the need for high-precision narrow-pitch electrode patterning while maintaining effective light release, thereby resolving the contradiction between light release efficiency and manufacturing precision
Solution Approach 2:
The patent changes the physical parameters of the light-emitting layer (thickness, material composition, emission characteristics) to create regions with different optical properties. This parameter-based approach achieves light management functionality without requiring the high spatial precision needed for narrow-pitch electrode patterning
3Ease of manufacture
If the electrode is patterned with wider pitches to reduce manufacturing complexity, then production costs decrease, but light release efficiency deteriorates
Solution Approach 1:
The patent extracts the light management function from electrode patterning and implements it in the light-emitting layer. This allows the use of simpler, coarser manufacturing processes for the electrode while achieving effective light release through the structured light-emitting layer, resolving the contradiction between ease of manufacture and light release efficiency
Solution Approach 2:
The patent moves light management from the two-dimensional electrode plane to the three-dimensional light-emitting layer structure. By utilizing vertical thickness variations and regional differences in the light-emitting layer, the device achieves effective light release without requiring complex or fine-pitch electrode patterning
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 device achieves highly efficient light emission by reducing total internal reflection and directing light outward, while maintaining a simple configuration and minimizing manufacturing complexity.
Implementation Method 1
The light-emitting layer includes first regions and second regions different from the first regions. The first regions and the second regions are regularly and alternately arranged in a direction perpendicular to a normal direction of the substrate.
Data Source
AI summary
A light-emitting device includes a light-emitting layer containing: quantum dots serving as light emitters; and dummy flakes not involved in emitting light. The quantum dots are localized. Thanks to such features, light generated from the quantum dots is diffracted in the light-emitting layer, directed in a normal direction that is a thickness direction of an array substrate, and emitted out of the light-emitting device.