AC-Coupled nLED Display Layout Without Direct Chip Bonding
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Solution Overview
Problem
The challenge lies in achieving accurate electrical contact and alignment of nano-sized LED grains with different light-emitting colors onto a circuit substrate using mechanical tools, which complicates the fabrication process and increases costs for nLED displays.
Innovation Solution
A non-direct electrical contact orientation ordered nLED light-emitting display device is designed with an upper and lower drive electrode substrate, an nLED grain sheet, and an AC drive control module, where the nLED grains are arranged in order with their light-emitting layers parallel to the substrates and perpendicular to the electric field, utilizing an insulating dielectric layer to facilitate electromagnetic coupling for lighting, thereby avoiding complex bonding and chip transfer processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If mechanical tools are used to transfer nLED grains onto a circuit substrate, then electrical contact and alignment can be achieved, but the fabrication process becomes complex and costly
Solution Approach 1:
The patent replaces the mechanical transfer and bonding system with an electromagnetic coupling system. Drive electrodes generate electric fields that directly couple with nLED grains through an insulating dielectric layer, eliminating the need for mechanical chip transfer tools and direct electrical contact, thus simplifying the fabrication process while maintaining precise alignment
Solution Approach 2:
The patent introduces an insulating dielectric layer as an intermediary between the drive electrodes and nLED grains. This dielectric layer enables electromagnetic coupling without direct mechanical or electrical contact, serving as a mediator that simplifies the fabrication process while ensuring precise positioning and electrical isolation
2Reliability
If direct electrical contact bonding is used between nLED grains and drive electrodes, then reliable electrical connection is achieved, but the fabrication cycle and cost increase
Solution Approach 1:
The patent replaces the mechanical bonding process with electromagnetic coupling through capacitive interaction. Drive electrodes generate alternating electric fields that couple with nLED grains through the dielectric layer, achieving reliable electrical connection without mechanical contact, thereby eliminating complex bonding processes and reducing fabrication cycle time
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 significantly simplifies the fabrication process, reduces the cycle and cost of nLED device production by eliminating the need for direct chip bonding and transfer, while enhancing luminous efficiency through improved electrical coupling.
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
Figure 1~2
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.