Light Emitter Matching Element Angular Color Point Distribution
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Solution Overview
Problem
Existing light emitting diode (LED) technologies face challenges in achieving a constant color point distribution as a function of angle due to the angular dependence of phosphor conversion, leading to inefficiencies and loss of light, particularly in applications requiring complex angular light distributions like automotive lighting for comfort and safety.
Innovation Solution
A light emitter with a phosphor and a pump source, where a matching element is used between the phosphor and the output to adjust the ratio of phosphor light intensity to transmitted pump light intensity, allowing for a predefined angular color point distribution, potentially using refractive or diffractive optical elements to match the angular light intensity distributions and achieve desired color points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a phosphor converted LED is used without high collimation, then the light source is simpler and more cost-effective, but the color point shows strong angular dependence
Solution Approach 1:
A matching element is introduced as an intermediary component between the phosphor and the output to adjust the angular distribution of transmitted pump light. This matching element acts as a mediator that modifies the optical path to compensate for the angular dependence of phosphor conversion, achieving constant color point without requiring complex collimated structures
Solution Approach 2:
The patent adjusts the angular light intensity distribution parameter of the transmitted pump light by using the matching element. By changing the angular distribution parameter to match that of the phosphor light, the system achieves constant color point across different viewing angles while maintaining a simple light source structure
2Stability of the object's composition
If the phosphor is made highly scattering to achieve constant color point, then the angular color distribution is improved, but a large amount of light is back scattered and lost
Solution Approach 1:
The matching element serves as an intermediary that adjusts the angular distribution of transmitted pump light before it combines with phosphor light. This approach achieves constant color point without relying on high scattering in the phosphor, thereby avoiding the energy loss from back scattering
Solution Approach 2:
Instead of changing the scattering properties of the phosphor material, the patent changes the angular distribution parameter of the transmitted pump light using the matching element. This parameter adjustment achieves the desired color point stability while maintaining high light transmission efficiency
3Stability of the object's composition
If a blue reflector is placed on top of the phosphor to achieve constant color point, then the angular color distribution is improved, but light is lost due to back reflection
Solution Approach 1:
The matching element acts as an intermediary component that adjusts the angular distribution of transmitted pump light in a controlled manner. This replaces the need for a blue reflector and avoids the energy loss associated with back reflection, achieving constant color point through optical parameter adjustment rather than reflective surfaces
4Device complexity
If conventional LED structures are used, then the system is simpler, but complex angular light color distribution needed for automotive lighting cannot be achieved
Solution Approach 1:
The matching element provides multi-functionality by simultaneously achieving constant color point and enabling customizable angular light color distributions. This single component serves multiple purposes: adjusting angular distribution, compensating for phosphor angular dependence, and providing versatility for different applications including automotive lighting requirements
Solution Approach 2:
The patent enables dynamic adjustment of angular light color distribution by using the matching element to control the angular distribution of transmitted pump light. This allows the light emitter to adapt to different application requirements, such as automotive lighting patterns, without changing the basic structure
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 solution enables a versatile light emitter with customizable angular color point distribution at low costs, maintaining high system efficiency and achieving desired light patterns for various applications, including automotive lighting, by adjusting the angular light intensity distribution of the transmitted pump light to match that of the phosphor light.
Implementation Method 1
the phosphor is adapted for emitting phosphor light by light conversion of absorbed pump light
Implementation Method 2
the matching element comprises a refractive optical element
Implementation Method 3
the matching element comprises a diffractive optical element
Data Source
AI summary
The invention relates to a light emitter adapted for emitting light with a predefined angular color point distribution, to a method of use for a light emitter in video flash applications, in automotive headlight applications and/or in automotive lamp applications, and to a method, adapted for generating light with a predefined angular color point distribution. The light emitter is adapted for emitting light with a predefined angular color point distribution through an output and comprises a phosphor (2) and a pump source (1), wherein the pump source (1) is adapted for emitting pump light to at least part of the phosphor (2), and the phosphor (2) is adapted for emitting phosphor light by light conversion of absorbed pump light, and wherein a matching element (4) is provided which is arranged at least partly between the phosphor (2) and the output of the light emitter, and which is adapted for adjusting the ratio of the light intensity of the emitted phosphor light emitted by the phosphor (2) towards the output of the light emitter to the light intensity of the transmitted pump light going through the phosphor (2) towards the output of the light emitter. In this way, a versatile light emitter with a predefined angular color point distribution in conjunction with any desired angular light intensity distribution is provided at low costs.