3D Interdigitated LED Electrodes for Better Micro-LED Contact
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Solution Overview
Problem
Existing ultra-small LED electrode assemblies face low light extraction efficiency due to a significant number of ultra-small LED devices not being connected to the first and second electrodes.
Innovation Solution
The electrode assembly features a base substrate with interdigitated first and second electrodes that have varying cross-sectional shapes, including semicircular, polygonal, and center-protruding designs, allowing for increased contact with ultra-small LED devices, which are either pillar-shaped or have a lattice or island configuration, enhancing connection stability and light extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If ultra-small LED devices are arranged on interdigitated electrode lines, then device density is improved, but light extraction efficiency deteriorates due to poor electrical connection
Solution Approach 1:
The electrode cross-section is transformed from a conventional flat shape to a three-dimensional protruding structure. This dimensional change allows the electrode to extend vertically toward the ultra-small LED devices, increasing the probability of electrical contact without increasing the planar footprint, thereby maintaining high device density while improving light extraction efficiency
Solution Approach 2:
The electrode structure is made non-uniform by introducing protruding portions at specific locations along the electrode line. These localized three-dimensional features concentrate the electrical contact points where they are most needed—near the ultra-small LED devices—while the rest of the electrode maintains its original function, thus improving reliability without compromising device density
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 design significantly improves light extraction efficiency by increasing the number of ultra-small LED devices connected to the electrodes, resulting in a higher discharge of photons and improved luminous efficiency.
Implementation Method 1
A light-emitting diode (LED) is a semiconductor device having a structure, in which an n type semiconductor crystal in which a large number of carriers are electrons and a p type semiconductor crystal in which a large number of carriers are holes are connected to each other using characteristics of a compound semiconductor, and converts an electrical signal into light having a wavelength range of a desired region and emits the light
Data Source
AI summary
Provided is a ultra-small light-emitting diode (LED) electrode assembly including a base substrate; an electrode line formed on the base substrate, and including a first electrode and a second electrode formed in a line shape to be interdigitated with each other while being spaced apart from each other; and at least one ultra-small LED device connected to the electrode line. A cross section of at least one of the first and second electrodes in a vertical direction has a height variation such that the first and second electrodes easily come in contact with the at least one ultra-small LED device.