Core-Shell Light-Emitting Rod Array for Easier Display Integration
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Solution Overview
Problem
The commercialization of rod light-emitting devices is hindered by difficulties in manufacturing electrode structures for current application and transferring them to a driving circuit layer, resulting in low light extraction efficiency.
Innovation Solution
A light-emitting device with a core-shell structure, comprising a first semiconductor layer, an active layer, and a second semiconductor layer, where a transparent electrode is connected to the first semiconductor layer and a reflective electrode is connected to the second semiconductor layer, with an insulating layer between the rods, and a common semiconductor layer for uniform current distribution, enhancing light extraction efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If rod light-emitting devices are used to achieve higher light extraction efficiency, then light extraction efficiency is improved, but manufacturing complexity and difficulty of integration increase
Solution Approach 1:
The device is divided into multiple rod-shaped light-emitting elements arranged in an array, with each rod having a core-shell structure. This segmentation allows for standardized manufacturing of individual rods that can be collectively integrated, reducing overall manufacturing complexity while maintaining high light extraction efficiency through the rod geometry
Solution Approach 2:
An insulating layer is introduced as an intermediary between adjacent rod light-emitting devices. This insulating layer simplifies the manufacturing process by providing a standardized interface for current application and facilitates integration with driving circuit layers, thereby reducing manufacturing complexity without affecting the light extraction efficiency of the rods themselves
2Loss of energy
If rod light-emitting devices are used to achieve higher light extraction efficiency, then light extraction efficiency is improved, but ease of transfer to driving circuit layer decreases
Solution Approach 1:
The light-emitting structure is segmented into discrete rod elements with standardized dimensions and configurations. This segmentation enables systematic transfer processes where multiple rods can be handled and integrated with driving circuits in a organized manner, improving ease of manufacture despite the complexity of the rod structure
Solution Approach 2:
The insulating layer serves as a mediator between the rod light-emitting devices and the driving circuit layer. It provides a standardized interface that simplifies the transfer and integration process, making it easier to manufacture and assemble the complete device while preserving the high light extraction efficiency of the rod structure
3Ease of operation
If transparent electrode and reflective electrode are added to facilitate current application, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The transparent electrode and reflective electrode are designed to serve multiple functions: they apply current to the rod light-emitting devices, provide electrical connections, and maintain the structural organization of the rod array. This multi-functionality improves ease of operation without proportionally increasing device complexity
Solution Approach 2:
Different electrode structures are applied at different locations: transparent electrodes are used where light emission needs to occur, and reflective electrodes are used at the bottom to reflect light and provide current application. This localized approach optimizes ease of operation for each region while managing overall device complexity
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 improves light extraction efficiency and facilitates easier manufacturing and integration of rod light-emitting devices into display apparatuses, enabling efficient light emission and commercialization.
Implementation Method 1
an active layer having a shell shape disposed about a plurality of surfaces of the first semiconductor layer
Implementation Method 2
a reflective electrode electrically connected to the second semiconductor layer of each of the plurality of light-emitting rods
Data Source
AI summary
A light-emitting device may include a plurality of light-emitting rods. Each of the plurality of light-emitting rods may include a first semiconductor layer having a rod shape, an active layer having a shell shape disposed about a plurality of surfaces of the first semiconductor layer, and a second semiconductor layer having a shell shape disposed about a plurality of surfaces of the active layer. The light emitting device may further include an insulating layer disposed in spaces between the plurality of light-emitting rods; a transparent electrode electrically connected to the first semiconductor layer of each of the plurality of light-emitting rods; and a reflective electrode electrically connected to the second semiconductor layer of each of the plurality of light-emitting rods.