Special-Shaped nLED Grain Display for Contactless AC Coupling
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Solution Overview
Problem
The challenge of transferring nano-sized LED (nLED) grains with different light-emitting colors onto a circuit substrate and achieving accurate electrical contact and alignment between μLED grains and drive electrodes has become difficult due to the miniaturization of LED chips, particularly for nLED grains.
Innovation Solution
A light-emitting display device utilizing special-shaped nLED grains with non-planar luminous layers, perpendicular to the electric field, and isolated by an insulating dielectric layer, coupled through electromagnetic interaction with AC drive signals, ensuring efficient electrical and luminous performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If LED chip size is decreased to achieve higher density and smaller pixel pitch, then display resolution and flexibility are improved, but mechanical transfer and electrical alignment become increasingly difficult
Solution Approach 1:
The patent replaces the traditional mechanical transfer and electrical contact system with an electromagnetic coupling system. nLED grains are transferred via inkjet printing without mechanical contact, and electrical coupling is achieved through electromagnetic interaction between the luminous layer and drive electrodes, eliminating alignment and bonding challenges associated with mechanical methods
Solution Approach 2:
The patent introduces an insulating dielectric layer as an intermediary between the nLED grains and drive electrodes. This dielectric layer enables electromagnetic coupling while preventing direct electrical contact, allowing the luminous layer to be positioned optimally for electromagnetic interaction without requiring precise mechanical alignment
2Productivity
If nLED grains are disposed randomly between electrode substrates, then transfer process is simplified, but electrical coupling efficiency and luminous efficiency decrease
Solution Approach 1:
The patent changes the geometric parameters of the luminous layer to a special shape with specific dimensional relationships. The luminous layer dimensions are designed so that regardless of the rotation angle θ, the projection area maintaining parallel relationship with electrode substrates remains substantial, ensuring efficient electromagnetic coupling without requiring precise orientation control during 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 enhances electrical coupling and luminous efficiency by maintaining the luminous layer parallel to the electrode substrates and perpendicular to the electric field, improving alignment and contact efficiency.
Implementation Method 1
the drive electrode is isolated from the nLED grains by an insulating dielectric layer, and in presence of the AC drive signal, the nLED grains are lighted up through electromagnetic coupling
Data Source
AI summary
A light-emitting display device based on special-shaped nLED grains comprises an upper drive electrode substrate, an upper drive electrode, special-shaped nLED grains, a lower drive electrode and a lower drive electrode substrate that are sequentially arranged from top to bottom, and is further provided with an AC drive control module having two ends connected to the upper drive electrode and the lower electrode respectively. The special-shaped nLED grains are nLED grains each comprising a non-planar luminous layer. The drive electrode is isolated from the nLED grains by insulating dielectric layer. In presence of the AC drive signal, the nLED grains are lighted up through electromagnetic coupling. By adoption of special-shaped nLED grains, when a grain sheet is disposed between the electrode substrates, the luminous layer of each nLED grain is always partially parallel to the electrode substrates and perpendicular to an electric field, thus greatly improving electrical coupling efficiency and luminous efficiency.