RGB LED Cluster Layout for Chromatic Aberration Compensation

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Solution Overview

Problem

Existing illumination systems face challenges in achieving uniform color mixing due to chromatic aberrations and focal plane issues when using multiple color LEDs, leading to non-uniform beam output.

Innovation Solution

The solution involves non-uniform placement of LEDs within LED clusters, where each LED is positioned at a different distance from the cluster center, and utilizing total internal reflection (TIR) structures and optics to compensate for height and wavelength-dependent beam angles, ensuring uniform light distribution.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If uniform LED placement is used in multi-color LED clusters, then manufacturing is simpler, but chromatic aberrations and focal plane issues cause non-uniform color mixing

Engineering Contradiction:

ImproveLED placement simplicityVSAvoidcolor mixing uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies asymmetry by deliberately placing LEDs of different colors at non-uniform positions within the cluster, with varying distances from the cluster center. This asymmetric placement compensates for wavelength-dependent beam angles and chromatic aberrations, ensuring that red, green, and blue LEDs are positioned to achieve uniform color mixing at the target surface despite their different optical characteristics.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent implements local quality by assigning different placement characteristics to LEDs of different colors. Each color channel (red, green, blue) has specifically optimized positioning relative to the cluster center, with placement distances and angles tailored to compensate for that color's specific beam angle and chromatic properties, rather than treating all LEDs uniformly.

Inventive Principle:

Principle #3Local quality

2Manufacturing precision

If multiple color LEDs are placed at different distances from cluster center, then color mixing uniformity improves, but device complexity increases

Engineering Contradiction:

Improvecolor mixing uniformityVSAvoidLED placement complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies parameter changes by systematically varying the placement parameters (distance from cluster center, angular position) of LEDs based on their color wavelength. The placement distance and angle are adjusted as controlled variables to compensate for wavelength-dependent beam angles, transforming the problem from a complex optimization challenge into a parameter-tuning solution that maintains manufacturability.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If uniform LED placement is used, then device complexity is reduced, but chromatic aberrations cause color artifacts

Engineering Contradiction:

Improveplacement configurationVSAvoidcolor artifacts

Core Design Contradiction:

Device complexityVSObject-generated harmful factors

Solution Approach 1:

The patent applies preliminary anti-action by pre-positioning LEDs of different colors at asymmetric locations that anticipate and counteract chromatic aberrations before light propagation occurs. The placement configuration is designed in advance to compensate for the known wavelength-dependent beam angle variations, preventing color artifacts from forming rather than correcting them after the fact.

Inventive Principle:

Principle #9Preliminary anti-action

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 enhances color uniformity and reduces color artifacts by aligning average positions of different colors across optics, resulting in improved color mixing and beam quality.

Implementation Method 1

utilizing total internal reflection (TIR) structures and optics to compensate for height and wavelength-dependent beam angles

Methodology Applied

Scientific EffectTotal internal reflection: Total Internal Reflection

Data Source

PatentUS20260085813A1Non uniform LED placement in RGB multi-optics

Publication Date: 2026.03.26 LUMILEDS LLC

AI summary

An illumination apparatus is provided to correct for chromatic aberration. A light-emitting diode (LED) structure has multiple LED clusters and an optic associated with each cluster. Each cluster is disposed in a cavity in a different total internal reflectance (TIR) structure. Each cluster contains individual LEDs that are configured to emit light of a different color toward the optic. In each cluster: a center of at least one LED within the cluster is disposed at a different distance from a center of the cluster than a center of at least one other LED within the cluster dependent on a wavelength dependence of the optic. For each color, an average position of the LEDs configured to emit the color within the clusters and an average position of the LEDs configured to emit each other color within the clusters are identical.