Non-Contact nLED Display Structure Using AC Electromagnetic Coupling
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Solution Overview
Problem
The challenge of achieving accurate electrical contact and alignment between nano-sized LED (nLED) grains and drive electrodes during the fabrication of ultrahigh-density LED displays is complex, leading to increased difficulty and cost.
Innovation Solution
A non-direct electrical contact orientation is employed, where nLED grains are arranged parallel to electrode substrates and perpendicular to the electric field, using an AC drive signal for electromagnetic coupling, eliminating the need for direct bonding and reducing fabrication complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If direct electrical contact bonding is used between nLED grains and drive electrodes, then reliable electrical connection is achieved, but fabrication complexity and process difficulty increase significantly
Solution Approach 1:
The patent introduces a dielectric layer as an intermediary between the nLED grains and drive electrodes, enabling non-direct electrical contact. This mediator allows electrical coupling through the dielectric layer without requiring direct physical bonding, thus simplifying the fabrication process while maintaining reliable electrical connection.
Solution Approach 2:
The patent replaces the mechanical bonding system with an electromagnetic coupling system. Instead of using mechanical tools to bond nLED grains directly to drive electrodes, the invention uses AC drive signals to create electromagnetic coupling through the dielectric layer, eliminating complex mechanical alignment and bonding processes.
2Manufacturing precision
If multiple chip transfer processes are used to achieve accurate alignment, then precise electrical contact is achieved, but fabrication cycle and cost increase
Solution Approach 1:
The dielectric layer serves as a mediator that decouples the alignment requirements between nLED grains and drive electrodes. Since electrical contact is achieved through electromagnetic coupling rather than direct contact, the stringent alignment requirements are relaxed, allowing for simpler, faster fabrication processes.
Solution Approach 2:
Instead of achieving alignment through multiple precise transfer steps, the patent inverts the approach by using the dielectric layer to enable electrical coupling without precise mechanical alignment. This reverses the traditional sequence of operations and eliminates the need for complex alignment procedures.
3Area of moving object
If nLED grain size is reduced to increase display density, then display resolution is improved, but difficulty of mechanical transfer and alignment increases
Solution Approach 1:
The patent replaces mechanical transfer and alignment methods with electromagnetic coupling through a dielectric layer. This substitution eliminates the difficulties associated with mechanically handling and positioning ultra-small nLED grains, as the electromagnetic coupling does not require precise mechanical contact.
Solution Approach 2:
The dielectric layer acts as an intermediary that enables electrical coupling between nLED grains and drive electrodes without requiring direct mechanical contact. This is particularly beneficial for ultra-small grains where mechanical handling becomes increasingly difficult.
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
This approach simplifies the fabrication process, reducing the cycle and cost of nLED devices by avoiding complex chip bonding and transfer processes while enhancing luminous efficiency.
Implementation Method 1
at least one of the upper drive electrode and the lower drive electrode is isolated from the nLED grains by an insulating dielectric layer, and in presence of the AC drive signal, the nLED grains light up through electromagnetic coupling
Data Source
AI summary
A non-direct electrical contact orientation ordered nLED light-emitting display device comprises an upper drive electrode substrate, an upper drive electrode, an nLED grain sheet, 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 drive electrode respectively. The nLED grain sheet is formed by a plurality of nLED grains that are arranged in order, so when the nLED grain sheet is disposed between the electrode substrates, a light-emitting layer of each nLED grain is parallel to the electrode substrates and perpendicular to the electric field. At least one of the upper drive electrode and the lower drive electrode is isolated from the nLED grains by an insulating dielectric layer. In presence of the AC drive signal, the nLED grains are lighted up through electromagnetic coupling. The invention adopts a non-direct electrical contact method to realize ordered nLED light-emitting display, thus omitting the transfer of a greater number of μLEDs and nLEDs and effectively reducing the process cost.