Tunable LED Systems Using Desaturated Orange and Cyan Emitters

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Solution Overview

Problem

Conventional tunable LED lighting systems have low LED emitter utilization, leading to increased costs and reduced luminance due to the need for more emitters to achieve the same luminous flux, and efficiency losses from phosphor interactions in white LED emitters.

Innovation Solution

The use of two groups of LED emitters, one configured to emit desaturated orange light and the other desaturated cyan light, with separate channels for power control, maximizing emitter utilization and luminous flux while minimizing phosphor interactions, allowing for CCT tuning between 2700K and 4000K with a CRI greater than 70.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional white LED emitters with phosphor conversions are used for CCT tuning, then color temperature adjustment is achieved, but LED emitter utilization is low and efficiency losses occur due to phosphor interactions

Engineering Contradiction:

ImproveCCT tuning capabilityVSAvoidefficiency losses from phosphor interactions

Core Design Contradiction:

Adaptability or versatilityVSLoss of energy

Solution Approach 1:

The invention divides the single white LED emitter with phosphor conversion into multiple separate LED emitters, each emitting a primary color (red, green, blue or cyan). This segmentation eliminates the need for phosphor conversion layers, thereby removing efficiency losses from phosphor interactions while maintaining CCT tuning capability through independent control of each color channel.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention extracts and removes the phosphor conversion layer from the LED system. By taking out the phosphor material that causes efficiency losses, the system achieves direct emission of primary colors from separate LED emitters, improving overall efficiency while preserving the ability to tune correlated color temperature through digital control of each channel.

Inventive Principle:

Principle #2Taking out (Extraction)

2Illumination intensity

If more LED emitters are used to achieve the same luminous flux, then luminance requirements are met, but system cost increases and LED emitter utilization decreases

Engineering Contradiction:

Improveluminous fluxVSAvoidnumber of emitters

Core Design Contradiction:

Illumination intensityVSDevice complexity

Solution Approach 1:

The invention implements dynamic control of multiple LED emitter channels through separate drive circuits, allowing real-time adjustment of each color channel's contribution to the total luminous flux. This dynamic capability enables optimal utilization of each emitter type across different CCT settings, improving overall LED emitter utilization while maintaining required luminance levels without increasing total emitter count.

Inventive Principle:

Principle #15Dynamics

3Productivity

If separate channels for each color are implemented, then LED emitter utilization and luminous flux are maximized, but device complexity increases

Engineering Contradiction:

Improveluminous flux efficiencyVSAvoidnumber of channels

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The invention designs the LED lighting system with multi-functional integrated drive circuits that can simultaneously control multiple color channels and perform CCT tuning, dimming, and color rendering optimization. This universal approach consolidates what could be separate complex functions into unified control architecture, managing the complexity of separate color channels while maximizing luminous flux efficiency through coordinated operation.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 LED emitter utilization, reduces the number of emitters needed, and maintains constant high luminous flux over the desired CCT range, improving optical control and efficiency while maintaining a high color rendering index.

Implementation Method 1

at least a first phosphor-converted LED configured to emit light having a desaturated orange color point characterized by CIE 1976 color coordinates 0.30.52

Methodology Applied

Scientific EffectPhosphor conversion: Photoluminescence

Implementation Method 2

at least a second phosphor-converted LED configured to emit light having a cyan color point characterized by CIE 1976 color coordinates 0.15

Methodology Applied

Scientific EffectPhosphor conversion: Photoluminescence

Data Source

PatentUS11825572B2Color tunable light emitting diode (LED) systems, LED lighting systems, and methods

Publication Date: 2023.11.21 LUMILEDS SINGAPORE PTE LTD

AI summary

Tunable LED lighting systems, devices and methods are described herein. A light emitting device includes at least a first phosphor-converted LED configured to emit light having a desaturated orange color point characterized by CIE 1976 color coordinates 0.3<u′<0.35 and v′>0.52 and at least a second phosphor-converted LED configured to emit light having a cyan color point characterized by CIE 1976 color coordinates 0.15<u′<0.20 and 0.47<v′<0.52. The first phosphor-converted LED and the second phosphor-converted LED are arranged to combine the light emitted by the first phosphor-converted LED with the light emitted by the second phosphor-converted LED to provide a white light output from the light emitting device.