Warm White LED Emitter with TIR Lens for High CRI
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Solution Overview
Problem
Conventional LED-based light sources struggle to produce bright warm white light with high Color Rendering Index (CRI) due to limitations in lumen efficiency, diffuser requirements, and collimation issues, especially with mixed off-white and red emitters or phosphor-based solutions, which result in low brightness and unsuitability for narrow beam applications.
Innovation Solution
A single emitter structure with mixed LED dice generating white and red light, combined with a color mixing Total Internal Reflection (TIR) lens, allows for high lumen efficiency warm white light production, achieving high CRI and R9 values, and enables flexible light color and brightness control through equal current supply to LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mixed off-white and red LED emitters are used to achieve warm white light with high CRI, then color rendering quality is improved, but lumen efficiency and brightness deteriorate
Solution Approach 1:
The patent combines multiple LED emitters (white, red, and amber) into a single integrated emitter module with a unified optical system. This merging approach allows the different wavelength emissions to be combined efficiently without requiring separate optical paths or additional diffusers, thereby maintaining high CRI while preserving lumen efficiency through centralized light extraction and collimation.
2Measurement precision
If multiple LED emitters are used to achieve warm white light, then color rendering is improved, but device complexity increases due to diffuser requirements
Solution Approach 1:
The patent extracts and eliminates the diffuser component from the optical system by using a reflective cup design that directly reflects and directs light from multiple LED emitters. This removal of the diffuser simplifies the optical path, reduces light loss, and maintains color rendering quality through direct reflective mixing rather than diffusive mixing.
Solution Approach 2:
The patent introduces a reflective cup as an intermediary optical element that facilitates light mixing and direction. The reflective cup serves as a mediator that collects light from multiple LED emitters and redirects it through a unified optical path, achieving color mixing and collimation without requiring complex diffuser assemblies or additional optical components.
3Measurement precision
If off-white and red emitters are located over a large area to achieve warm white light, then color rendering is improved, but collimation becomes difficult
Solution Approach 1:
The patent merges multiple LED emitters into a compact, co-located arrangement within a single emitter module. By positioning white, red, and amber LEDs in close proximity and using a unified reflective cup and lens system, the design achieves effective collimation of the combined light output, enabling narrow beam applications while maintaining high CRI through the integrated multi-wavelength emission.
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 solution achieves high lumen efficiency, high CRI, and R9 values, providing bright and uniformly colored warm white light suitable for narrow beam applications without the need for additional diffusers, with performance measurements showing up to 80 Lumens/Watt and CRI of 90.
Implementation Method 1
combined with a color mixing TIR (total internal reflection) lens
Data Source
AI summary
An LED light emitter includes a single emitter structure having a substrate with a plurality of light emitting diodes (LEDs) arranged thereon, wherein the plurality of LEDs includes at least one first LED die that produces a first color light, and at least one second LED die that produces a second color light. The LED light emitter also includes a total internal reflection (TIR) lens positioned to collect light emitted from the single emitter structure and adapted to mix the light from the plurality of LEDs to produce a uniform light. The plurality of LEDs are selected such that the light output by the LED light emitter has a desired color temperature when an equal current is supplied to all of the plurality of LEDs.