LED Light Source Color Tone Uniformity via Fluorescent Ratios
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Solution Overview
Problem
The existing light-emitting devices with LEDs of different peak emission wavelengths produce undesirable color tone differences that are easily visually recognizable, affecting the display quality in lighting and display devices.
Innovation Solution
A light source configuration that includes two blue LEDs with different primary emission wavelengths, each with a wavelength conversion portion containing green and red fluorescent materials, where the ratio and composition of these materials differ between the two conversion portions to minimize color tone differences, and are housed in separate sealing portions within a common housing to optimize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEDs with different peak emission wavelengths are used to regulate biological rhythm, then the ability to control melatonin secretion is improved, but color tone differences become visually recognizable
Solution Approach 1:
The patent applies local quality by using different ratios of green and red fluorescent materials in different wavelength conversion portions. Specifically, the first wavelength conversion portion has a different ratio of green to red fluorescent materials compared to the second wavelength conversion portion, allowing each portion to compensate for the specific color characteristics of its corresponding LED while maintaining overall color uniformity
Solution Approach 2:
The patent changes the parameters of the fluorescent materials by adjusting the ratios of green and red fluorescent materials in different wavelength conversion portions. This parameter adjustment allows the system to convert blue light from LEDs with different peak wavelengths into light with matched color tones, resolving the color uniformity issue while preserving biological rhythm regulation functionality
2Adaptability or versatility
If blue light with shorter wavelength is used to reduce melatonin restraint, then the biological rhythm control is improved, but the color tone difference with other blue LEDs increases
Solution Approach 1:
The patent introduces wavelength conversion portions with fluorescent materials as intermediaries between the blue LEDs and the final light output. These intermediary fluorescent materials convert the blue light to a mixture of green and red light, effectively mediating the color tone differences caused by different blue LED wavelengths and achieving uniform perceived color while preserving the biological rhythm control benefits
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 effectively reduces the visual recognition of color tone differences, enhancing display quality by adjusting the quantity and composition of fluorescent materials in the wavelength conversion portions to match the emission spectra of the LEDs, thereby improving the uniformity of light emitted.
Implementation Method 1
a first green fluorescent material configured to wavelength-convert light emitted by the first light-emitting element to green light in a green wavelength region
Implementation Method 2
a first red fluorescent material configured to wavelength-convert the light emitted by the first light-emitting element to red light in a red wavelength region
Implementation Method 3
a second green fluorescent material configured to wavelength-convert light emitted by the second light-emitting element to the green light
Implementation Method 4
a second red fluorescent material configured to wavelength-convert the light emitted by the second light-emitting element to the red light
Data Source
AI summary
A light source includes a first wavelength conversion portion including a first green fluorescent material to wavelength-convert light emitted by a first light-emitting element to green light in a green wavelength region and a first red fluorescent material to wavelength-convert the light emitted by the first light-emitting element to red light in a red wavelength region, and a second wavelength conversion portion including a second green fluorescent material to wavelength-convert light emitted by the second light-emitting element to the green light and a second red fluorescent material to wavelength-convert the light emitted by the second light-emitting element to the red light. The first wavelength conversion portion and the second wavelength conversion portion differ from each other in either one or both of a quantity and a composition of the first green fluorescent material, the first red fluorescent material, the second green fluorescent material, and the second red fluorescent material.