Quantum Dot Porous LED Structure for Higher Light Extraction
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Solution Overview
Problem
Existing display devices face challenges in achieving high light conversion efficiency and light extraction efficiency, particularly in flexible and stretchable display technologies.
Innovation Solution
A display device is designed with a substrate that includes a display area and a non-display area, featuring a plurality of light-emitting diodes with a double porous layer structure. This structure comprises a first porous layer with pores extending perpendicular to the substrate and a second porous layer with pores extending in random directions, both integrated into the second semiconductor layer. Quantum dots are arranged within these pores, enhancing light conversion and extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single porous layer structure is used in light-emitting diodes, then the device complexity is reduced, but light extraction efficiency is insufficient
Solution Approach 1:
The single porous layer is divided into two distinct porous layers with different pore orientations. The first porous layer has vertically extending pores while the second porous layer has diagonally extending pores, creating a segmented structure that improves light extraction efficiency by addressing different light propagation paths separately
Solution Approach 2:
The patent introduces a new dimensional aspect by varying the pore extension direction between layers. The first layer uses vertical pore orientation while the second layer uses diagonal pore orientation, adding directional diversity to the light extraction mechanism and improving overall efficiency
2Loss of energy
If quantum dots are added to enhance light conversion, then light conversion efficiency is improved, but the device complexity increases
Solution Approach 1:
The patent combines the light conversion function with the existing porous layer structure by placing quantum dots within the pores. This merging approach integrates the quantum dot functionality into the structural framework rather than adding a completely separate component system
Solution Approach 2:
The patent utilizes the porous structure as a carrier for quantum dots. The pores in both porous layers provide spaces for quantum dot placement, allowing the porous material structure to serve dual purposes of light extraction enhancement and quantum dot integration
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 proposed solution significantly improves light conversion and extraction efficiency, enabling the display device to achieve better image quality and performance, particularly in flexible and stretchable form factors.
Implementation Method 1
Quantum dots may be arranged within the first pore and the second pore
Implementation Method 2
the first porous layer defines a first pore therein extending in a direction perpendicular to a major surface of the substrate, and the second porous layer defines a second pore therein extending in a randomly variable direction
Data Source
AI summary
A display device includes: a substrate including a display area and a non-display area outside the display area; and a plurality of light-emitting diodes arranged in the display area, where each of the plurality of the light-emitting diodes has a double porous layer structure including a first porous layer and a second porous layer disposed below the first porous layer, the first porous layer defines a first pore therein extending in a direction perpendicular to a major surface of the substrate, and the second porous layer defines a second pore therein extending in a randomly variable direction.