Turquoise Blue Lighting with Mixed Chromaticity Ranks
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Solution Overview
Problem
Conventional lighting devices emitting turquoise blue light face challenges in maintaining consistent chromaticity due to changes in emission wavelength with temperature and current density, leading to increased manufacturing costs and reduced yield.
Innovation Solution
A lighting device comprising a first and a second light-emitting element with different chromaticity ranks, mixed in a light mixing unit to produce radiated light within the turquoise blue chromaticity range, utilizing overlapping and opposite chromaticity changes with temperature and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light-emitting element is used to emit turquoise blue light, then the device structure is simple, but the chromaticity changes significantly with temperature and current density variations
Solution Approach 1:
The patent divides a single light-emitting element into multiple light-emitting elements with different chromaticity characteristics (first chromaticity rank and second chromaticity rank). Each element has different temperature and current density characteristics, and their combined output maintains stable turquoise blue chromaticity across varying operating conditions.
2Manufacturing precision
If a narrow chromaticity range is selected for turquoise blue light, then the chromaticity uniformity is improved, but the manufacturing yield decreases and cost increases
Solution Approach 1:
The patent changes the chromaticity parameters of multiple light-emitting elements to different ranks, where each rank has different temperature and current density characteristics. By combining elements with complementary characteristics, the overall chromaticity remains stable within a wider acceptable range, improving manufacturing yield while maintaining uniformity.
3Manufacturing precision
If multiple light-emitting elements with different chromaticity ranks are combined, then the chromaticity uniformity is improved, but the device structure becomes more complex
Solution Approach 1:
The patent merges multiple light-emitting elements with different chromaticity ranks into a single lighting device. The first and second light-emitting elements are positioned to emit light in overlapping regions, and their combined output produces stable turquoise blue chromaticity. The elements are integrated into a unified structure with common packaging and optical components.
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
Improves yield and achieves uniform chromaticity by relaxing selection requirements for turquoise blue color, reducing manufacturing costs and enhancing consistency.
Implementation Method 1
a first light-emitting element that emits first light belonging to a first chromaticity rank
Implementation Method 2
a lighting device in which a light-emitting diode and a wavelength conversion member are combined with each other
Implementation Method 3
a second light-emitting element that emits second light belonging to a second chromaticity rank
Implementation Method 4
a lighting device in which a light-emitting diode and a wavelength conversion member are combined with each other
Implementation Method 5
a light mixing unit that mixes the first light and the second light and radiates the light as radiated light to an outside
Data Source
AI summary
A lighting device capable of improving yield by relaxing a selection requirement for turquoise blue and making chromaticity uniform is provided. The lighting device (100) includes a first light-emitting element (12a) that emits first light belonging to a first chromaticity rank, a second light-emitting element (12b) that emits second light belonging to a second chromaticity rank, and a light mixing unit (20) that mixes the first light and the second light and radiates the light as radiated light to an outside, wherein the first chromaticity rank and the second chromaticity rank are different from each other, and the radiated light is within a chromaticity range of turquoise blue.