Ultra-Small LED Electrode Assembly for DC Luminance and Short Prevention
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Solution Overview
Problem
Ultra-small LED devices face challenges in achieving desired luminance due to electrical short-circuits and limited light extraction when connected to electrodes, especially when driven by direct current (DC) power, as they often require alternating current (AC) power for optimal performance.
Innovation Solution
An ultra-small LED electrode assembly is manufactured using an asymmetric assembly voltage of 10 V or more, applied to an electrode line with a first and second mounting electrode, allowing ultra-small LED devices to self-mount and ensuring contact with both electrodes, along with heat treatment and ohmic layer formation to enhance light extraction and reduce electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If ultra-small LED devices are connected to electrodes in conventional arrangements, then the electrode structure is simple, but light extraction is blocked and electrical short-circuits occur reducing luminance
Solution Approach 1:
The patent transitions from conventional planar electrode arrangements to a three-dimensional configuration where electrodes are positioned at different heights and angles. The first electrode is arranged at a first position and the second electrode at a second position different from the first, creating spatial separation that enables light extraction while maintaining electrical connection.
Solution Approach 2:
The electrode system is divided into multiple segmented electrodes (first electrode, second electrode, third electrode, fourth electrode) positioned at different locations and orientations. This segmentation allows different portions of the LED structure to be accessed independently, enabling both electrical connection and light extraction pathways.
2Reliability
If ultra-small LED devices are mounted on electrodes, then electrical connection is established, but alignment precision is difficult to control leading to short-circuits
Solution Approach 1:
The electrodes are pre-positioned and fixed in their respective positions before the ultra-small LED devices are mounted. The first electrode is arranged at a first position and the second electrode at a second position, establishing a predetermined electrical connection pathway that guides the LED placement and ensures proper alignment.
Solution Approach 2:
The patent introduces an intermediary structural arrangement where electrodes are positioned at different heights and spatial locations, acting as mediators between the LED terminals. This intermediary positioning provides tolerance for alignment variations while ensuring reliable electrical connection.
3Use of energy by moving object
If DC power is applied to ultra-small LED devices, then power consumption is reduced, but luminance is significantly reduced due to rectifier characteristics
Solution Approach 1:
The patent employs asymmetric electrode arrangements and asymmetric power application strategies. The electrodes are positioned asymmetrically in space, and the power supply is configured to apply voltage asymmetrically across the LED terminals, compensating for the rectifier characteristics and enabling efficient DC-driven operation with maintained luminance.
Solution Approach 2:
The patent modifies operational parameters including applying different voltages to different electrodes (first voltage to first electrode, second voltage to second electrode), and adjusting the spatial and temporal characteristics of power application to optimize DC driving performance and overcome LED rectifier limitations.
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 method significantly improves luminance gain, allowing for efficient light emission even with DC power, increasing the number of functional LED devices and enhancing light intensity across specific wavelengths, making it suitable for various applications including liquid-crystal display backlight units and lamps.
Implementation Method 1
applying power having an asymmetric assembly voltage of 10 V or more according to the following Equation 1 to the electrode line and self-mounting the plurality of ultra-small LED devices
Implementation Method 2
heat treatment and ohmic layer formation to enhance light extraction and reduce electrical shorts
Implementation Method 3
ohmic layer formation to enhance light extraction and reduce electrical shorts
Data Source
AI summary
An ultra-small light-emitting diode (LED) electrode assembly having an improved luminance is provided. More particularly, an ultra-small LED electrode assembly in which light, which is blocked by an electrode and cannot be extracted, is minimized, an ultra-small LED device is connected to an ultra-small electrode without a defect such as an electrical short-circuit, and a very excellent luminance is exhibited even at a direct current (DC) driving voltage, and a method of manufacturing the same are provided.