LED Illumination Module Visually Matched to Halogen Light

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Solution Overview

Problem

Existing LED-based illumination modules struggle to visually match the color of light sources not based on LEDs, such as halogen lamps, due to limitations in the CIE 1931 XYZ color space, which fails to accurately express the perceived color of light sources with widely differing spectra.

Innovation Solution

The development of LED-based illumination modules that utilize a visually matched color space to instrumentally and visually match the color of light sources not based on LEDs, achieved by constructing modules with wavelength converting components that produce a target color point within a predetermined tolerance, allowing for accurate color control and matching across different technologies.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If LED-based illumination modules use the CIE 1931 XYZ color space for color characterization, then instrumental color measurement is standardized, but visual color match to non-LED light sources deteriorates

Engineering Contradiction:

Improvecolor measurement standardizationVSAvoidvisual color match accuracy

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The patent changes the color space parameters from CIE 1931 XYZ to a visually matched color space (such as halogen matched color space) that is specifically optimized for matching LED output to non-LED light sources. This parameter transformation allows the color characteristics to be expressed in a way that reflects human visual perception more accurately, resolving the contradiction between standardized measurement and visual match accuracy.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces a visually matched color space as an intermediary between the LED light source and the target non-LED light source. This intermediary color space serves as a bridge that translates the spectral characteristics of LED into a color representation that directly corresponds to human visual perception, enabling accurate visual matching without relying solely on the limitations of CIE 1931 XYZ.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Ease of manufacture

If LED modules target a specific color point in CIE 1931 XYZ color space, then manufacturing control is simplified, but visual perceptibility of color differences increases

Engineering Contradiction:

Improvecolor control simplicityVSAvoidvisually perceptible color differences

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent transforms the color target from CIE 1931 XYZ color space to a visually matched color space, changing the parameter system to one that directly addresses human visual perception. This allows manufacturers to maintain simple control procedures while achieving superior visual color matching, as the new color space parameters are specifically designed to minimize visually perceptible differences.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If the CIE 1931 XYZ color space is used to characterize light sources with widely differing spectra, then universal color measurement is achieved, but color accuracy for specific light source types deteriorates

Engineering Contradiction:

Improvecolor measurement universalityVSAvoidcolor accuracy for specific light sources

Core Design Contradiction:

Adaptability or versatilityVSMeasurement precision

Solution Approach 1:

The patent segments the color measurement approach by creating different color spaces tailored to specific light source types. Instead of using a single universal CIE 1931 XYZ color space for all light sources, the invention develops visually matched color spaces (such as halogen matched, LED matched) that are specifically optimized for particular light source characteristics, thereby improving measurement precision for each type while maintaining universality through the framework of multiple specialized color spaces.

Inventive Principle:

Principle #1Segmentation

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 enables the reliable manufacture of LED-based illumination modules that visually match non-LED light sources, ensuring consistent color perception and minimizing visually perceptible differences, even when the light sources have distinct spectral characteristics.

Implementation Method 1

The LED based illumination module includes a plurality of LEDs and a first and second selectable wavelength converting component

Methodology Applied

Scientific EffectWavelength conversion: Fluorescence

Data Source

PatentUS8746922B2LED based illumination module color matched to an arbitrary light source

Publication Date: 2014.06.10 SBC XICATO CORP

AI summary

LED based illumination modules are realized that are visually color matched to light sources not based on LEDs based on visually matched color spaces. A visually matched color space is employed to both instrumentally and visually match an LED based light source with a light source not based on LEDs. In one aspect, an LED based illumination module is realized to achieve a target color point in a visually matched color space within a predetermined tolerance. In another aspect, an LED based illumination module is realized to visually match a light source not based on LEDs. A target color point in the CIE 1931 XYZ color space is derived based at least in part on the spectrum of the visually matched LED based illumination module. LED based illumination modules visually matched to light sources not based on LEDs are realized based on the derived target color point.