Light Conversion Element Luminance Optimization
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Solution Overview
Problem
Existing lighting devices based on laser light sources fail to achieve adequately high luminance while maintaining low power consumption, often resulting in 'blue-shifted' color coordinates that are not usable for desired applications.
Innovation Solution
A lighting device with a light conversion element configured for remission operation, using a diode laser as the primary light source, where the light conversion element, typically made of YAG, converts blue primary light into white secondary light with a higher luminance, achieved by optimizing the ratio of the primary light receiving surface diameter to the thickness of the light conversion element and incorporating efficient cooling mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a laser light source is used to provide high luminance, then the luminance is improved, but the power consumption increases
Solution Approach 1:
The patent optimizes the ratio between the diameter of the primary light receiving surface and the thickness of the light conversion element. By adjusting this geometric parameter ratio, the system achieves high luminance output while maintaining low power consumption, resolving the contradiction between illumination intensity and energy usage.
2Temperature
If the light conversion element is made thinner to reduce heat, then the temperature is improved, but the light conversion efficiency decreases
Solution Approach 1:
The patent identifies and optimizes the critical parameter ratio between the primary light receiving surface diameter and light conversion element thickness. This optimization allows the element to be sufficiently thin for heat dissipation while maintaining adequate thickness for effective light conversion, thereby resolving the contradiction between temperature control and conversion efficiency.
3Area of stationary object
If the primary light receiving surface diameter is increased to improve coverage, then the area is improved, but the luminance density decreases
Solution Approach 1:
The patent optimizes the diameter of the primary light receiving surface relative to the light conversion element thickness. By controlling this parameter ratio, the system achieves optimal coverage area while maintaining high luminance density, resolving the contradiction between area and intensity.
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 a high luminance of over 1000 cd/mm² with reduced power consumption, enabling the emission of white light within the ECE color coordinate field, suitable for applications in the automobile, aircraft, medical, and general lighting sectors.
Implementation Method 1
a light conversion element configured for remission operation... converts blue primary light into white secondary light
Data Source
AI summary
Lighting devices for providing a secondary light with high luminance are provided. The lighting devices include a light conversion element and a light emitting unit with a light source that emits a primary light. The light conversion element has a front side illuminated with the primary light and, in response to the primary light, to emit a secondary light from the front side. The secondary light has a larger wavelength than the primary light.