LED Color Temperature Tuning via Spacing Adjustment

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Solution Overview

Problem

Current LED lighting technologies face challenges in effectively tuning color temperature after the package process, affecting color rendering, output efficiency, and color uniformity, particularly in white light-emitting diodes (WLEDs).

Innovation Solution

A light-emitting device comprising a carrier with a first and second LED unit, where the second LED unit is spaced apart from the first and electrically connected to the circuit, allowing for adjustment of the space between LED units to correlate with the overall color temperature, enabling precise tuning within predetermined temperature standards.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the space between LED units is increased to adjust color temperature, then color temperature tuning capability is improved, but device area increases

Engineering Contradiction:
Improvecolor temperature tuning capabilityVSAvoiddevice area
Core Design Contradiction:
Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent applies dynamics by making the space between LED units adjustable rather than fixed. The second LED unit can be positioned at different distances from the first LED unit, allowing the device to dynamically tune its overall color temperature. This resolves the contradiction by enabling color temperature adaptation without permanently increasing device area, as the space can be optimized for different operating conditions.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The patent changes the physical parameter of spacing between LED units to control the overall color temperature. By varying this spatial parameter, the device can achieve different color temperatures (e.g., from warm white to cool white) without changing the LED units themselves. This allows color temperature tuning while maintaining a compact form factor, as only the spacing parameter needs to be adjusted.

Inventive Principle:
Principle #35Parameter changes

2Adaptability or versatility

If multiple LED units are used to achieve color temperature tuning, then color rendering is improved, but device complexity increases

Engineering Contradiction:
Improvecolor renderingVSAvoiddevice complexity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent segments the light-emitting function into multiple LED units with different color temperatures (e.g., first LED unit with warm white and second LED unit with cool white). Each unit can be independently controlled, allowing flexible color rendering. This segmentation enables color temperature tuning without requiring complex spectral conversion mechanisms, thereby managing device complexity through functional decomposition.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent merges multiple LED units with different color characteristics into a single integrated light-emitting device. By combining units with different color temperatures and controlling their relative positions, the device achieves versatile color rendering. This merging approach simplifies the overall system compared to using single complex LEDs, as it leverages the additive nature of light mixing from simpler components.

Inventive Principle:
Principle #5Merging (Combining)

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 allows for effective adjustment of the overall color temperature of the light-emitting device by varying the space between LED units, ensuring compliance with color temperature standards while maintaining minimal impact on luminous flux, thereby enhancing color rendering and efficiency.

Implementation Method 1

The first LED unit and the second LED unit, and each includes a light-emitting body and a wavelength conversion layer covering the light-emitting body

Methodology Applied
Scientific EffectWavelength conversion: Fluorescence

Data Source

PatentUS9520384B2Light-emitting device
Publication Date: 2016.12.13 ENNOSTAR CORP
  • US9520384B2 patent drawing
  • US9520384B2 patent drawing
  • US9520384B2 patent drawing

AI summary

A light-emitting device, having an overall color temperature when emitting light, includes a carrier, a first LED unit, and a second LED unit. The carrier has a circuit. The first LED unit is arranged on the carrier and has a first color temperature. The second LED unit is spaced apart from the first LED unit by a space, and electrically connected to first LED unit and the circuit. The first LED unit and the second LED unit, and each includes a light-emitting body and a wavelength conversion layer covering the light-emitting body. The first color temperature is different from the overall color temperature.