Six-Chromaticity LED Module for White-Region Color Mixing

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Solution Overview

Problem

Lighting devices, such as stage lights, require a wide color gamut and high total luminous flux when emitting light with chromaticity coordinates within the white region in a chromaticity diagram, which existing LED modules fail to achieve effectively.

Innovation Solution

An LED module comprising six types of LED light sources with different chromaticities, arranged in a configuration where two sets of triangular regions in an xy chromaticity diagram cover the white region, ensuring wide color gamut and high luminous flux by mixing light from three types of LED sources each, with optional phosphor-enhanced light sources for increased spectral efficiency.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional LED modules with fewer LED light source types are used, then the device complexity is reduced, but the color gamut is limited and cannot cover the white region effectively

Engineering Contradiction:

Improvecolor gamutVSAvoidnumber of LED light source types

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The invention segments the white region coverage into two separate triangular regions in the chromaticity diagram. Each triangle is formed by three specific LED light sources with carefully selected chromaticities. This segmentation allows the system to cover the entire white region using two distinct combinations of three LED types each, achieving comprehensive white region coverage without requiring all six LED types to be active simultaneously, thus managing device complexity while expanding color gamut.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If more LED light sources with different chromaticities are added to expand color gamut, then the color rendering improves, but the total luminous flux decreases

Engineering Contradiction:

Improvecolor gamutVSAvoidtotal luminous flux

Core Design Contradiction:

Adaptability or versatilityVSUse of energy by moving object

Solution Approach 1:

The invention employs partial action by activating only three LED light sources at a time from the six available types, depending on which triangular combination is needed to cover the desired white region. This partial activation strategy ensures high luminous flux output by limiting the number of active LED types while still achieving complete white region coverage through the two predefined triangular combinations, thus avoiding the luminous flux reduction that would occur if all six LED types were activated simultaneously.

Inventive Principle:

Principle #16Partial or excessive action

3Adaptability or versatility

If six types of LED light sources are used to cover the white region, then the color gamut is maximized, but the control complexity and chromaticity shifts increase

Engineering Contradiction:

Improvewhite region coverageVSAvoidcontrol complexity

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The invention implements a dynamic control strategy where the system switches between two predefined triangular combinations of three LED types each, based on the specific white region coverage requirements. This dynamic switching approach simplifies control compared to managing all six LED types independently, as the control logic only needs to select between two predetermined combinations rather than continuously adjusting six different chromaticities, thus reducing control complexity while maintaining complete white region coverage capability.

Inventive Principle:

Principle #15Dynamics

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 LED module achieves a wide color gamut and high total luminous flux within the white region, simplifying control and reducing chromaticity shifts, while maintaining color rendering properties.

Implementation Method 1

a plurality of LED light sources that are mounted on the substrate and include six types of LED light sources that emit light having mutually different chromaticities

Methodology Applied

Scientific EffectElectroluminescence: Electroluminescence

Data Source

PatentEP4468346A1LED module and lighting device

Publication Date: 2024.11.27 PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO LTD

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AI summary

An LED module (100) includes a substrate (1) and a plurality of LED light sources (11, .., 16) that are mounted on the substrate and include six types of LED light sources that emit light having mutually different chromaticities. In an xy chromaticity diagram in an XYZ color system defined in JIS Z8701, each of a first region (A1) in a triangular shape whose vertices are chromaticity coordinates of light emitted by three types of LED light sources (L1, L2, L3) among the six types of LED light sources and a second region (A2) in a triangular shape whose vertices are chromaticity coordinates of light emitted by other three types of LED light sources (L4, L5, L6) among the six types of LED light sources covers the entirety of white region (A0).