RGB Micro-LED Layout for Luminance Balance and Lower Recombination

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Solution Overview

Problem

Miniaturization of light-emitting diodes (LEDs) leads to increased non-radiative recombination at side surfaces, resulting in degraded light-emitting efficiency due to lattice dislocations and etching processes.

Innovation Solution

A light-emitting device comprising multiple light-emitting units emitting red, blue, and green lights, with the red light-emitting unit having a larger area than the blue and green units to balance luminance, and each unit having dimensions less than 100 μm to minimize non-radiative recombination effects.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If the size of light-emitting diode is miniaturized, then the volume and area are reduced, but the non-radiative recombination effect increases and light-emitting efficiency degrades

Engineering Contradiction:

Improvevolume of light-emitting diodeVSAvoidnon-radiative recombination loss

Core Design Contradiction:

Volume of moving objectVSLoss of energy

Solution Approach 1:

The patent applies local quality by creating an insulating film structure specifically at the side surfaces of the light-emitting diode where non-radiative recombination occurs. This localized treatment addresses the edge effect without affecting the overall device performance, transforming the harmful side surface into a beneficial structure that reduces carrier leakage and improves light-emitting efficiency

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The insulating film acts as an intermediary layer between the semiconductor layers at the side surfaces. This intermediate structure prevents direct interaction between carriers and defect states at the etched surfaces, thereby reducing non-radiative recombination while maintaining the miniaturized device dimensions

Inventive Principle:

Principle #24Intermediary (Mediator)

2Volume of moving object

If the size of light-emitting diode is miniaturized, then the volume and area are reduced, but the influence of lattice dislocations at side walls increases

Engineering Contradiction:

Improvevolume of light-emitting diodeVSAvoidlattice dislocation influence

Core Design Contradiction:

Volume of moving objectVSObject-affected harmful factors

Solution Approach 1:

The insulating film is selectively formed at the side walls where lattice dislocations concentrate due to etching. This localized protection addresses the specific region affected by miniaturization without requiring changes to the overall device architecture or material composition

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The insulating film is formed on the side surfaces before final device assembly and testing. This preliminary protective action prevents carrier leakage and reduces the impact of lattice dislocations before they can significantly degrade device performance during operation

Inventive Principle:

Principle #10Preliminary action

3Area of stationary object

If the area of light-emitting diode is reduced, then the size is miniaturized, but the diffusion of electrons and holes to side surfaces increases

Engineering Contradiction:

Improvearea of light-emitting diodeVSAvoidlight-emitting efficiency

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The insulating film creates a localized barrier at the side surfaces where carrier diffusion becomes problematic in miniaturized devices. This selective modification of side surface properties prevents excessive carrier diffusion to edges while maintaining efficient light emission from the active region

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The etching process that creates harmful side wall defects is transformed into a beneficial structure by forming an insulating film on these same side walls. The previously harmful etched surfaces become protective barriers that actually improve device performance by preventing carrier leakage

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 effectively balances the luminance of red, blue, and green lights and enhances the light-emitting efficiency by minimizing non-radiative recombination, thereby improving the overall performance of miniaturized LEDs.

Implementation Method 1

The light-emitting diode has a stack structure including a first semiconductor layer, a second semiconductor layer, and an active stack between the first semiconductor layer and the second semiconductor layer

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Implementation Method 2

The non-radiative recombination is that holes and electrons combined in the active stack and not released in the form of photons

Methodology Applied

Scientific EffectRadiative recombination:

Data Source

PatentUS12255188B2Light-emitting device

Publication Date: 2025.03.18 ENNOSTAR CORP

AI summary

An embodiment of present invention discloses a light-emitting device which includes a first light-emitting area, a second light-emitting area, and a third light-emitting area. The first light-emitting area emits a red light and includes a first light-emitting unit. The second light-emitting area emits a blue light and includes a second light-emitting unit. The third light-emitting area emits a green light and includes a third light-emitting unit. The first light-emitting area is larger than the second light-emitting area and larger than the third light-emitting area. Each of the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit has a width of less than 100 μm and a length of less than 100 μm.