Vehicle Lightguide With Quantum Dot Color Conversion
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Solution Overview
Problem
The gamut achieved from RGB Light Emitting Diodes (LEDs) is restricted to the native RGB semiconductors incorporated in the packaging, limiting color variation.
Innovation Solution
A lighting device comprising monochromatic light sources and optical lightguides with wavelength conversion layers using quantum dots to transform light into a wider range of colors, allowing for color tuning and a broader gamut of RGB colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If RGB Light Emitting Diodes are used, then lighting functionality is provided, but the gamut of colors is restricted to the native RGB semiconductors
Solution Approach 1:
The patent introduces a diffusive foil as an intermediary component between the RGB Light Emitting Diode and the final light output. This foil, formed through a thermoform process with an overmoulded process, modifies the light characteristics to expand the color gamut beyond the native semiconductor limitations while maintaining the existing light source structure.
Solution Approach 2:
The patent changes the physical and optical parameters of the light output by using a diffusive foil with specific thermoformed characteristics. This foil alters the wavelength distribution and spatial characteristics of the emitted light, thereby expanding the achievable color gamut without changing the fundamental RGB LED structure.
2Stability of the object's composition
If a diffusive foil is used to diffuse light, then homogenous light is achieved, but color tuning capability is lost
Solution Approach 1:
The patent applies local quality by creating a diffusive foil with spatially varying properties through the thermoform process. Different regions of the foil have different optical characteristics, allowing simultaneous achievement of light homogenization in some areas while preserving color tuning capabilities in other regions or at different wavelengths.
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 use of quantum dots in wavelength conversion layers enhances color variation, achieving a wider gamut of RGB colors with reduced material usage and lower environmental impact.
Implementation Method 1
a stack of at least one wavelength conversion layer which is configured to receive said light rays according to said orientation and to transform them into at least one light beam according to at least one second range of wavelengths
Implementation Method 2
the absorption of the latter film can be characterized by the optical density (OD), a quantity indicating the light absorbed by a material
Data Source
Figure 1~2a
Figure 2b~3
Figure 4~5
AI summary
The invention relates to a lighting device (1), said lighting device (1) comprising : - at least one light source (10) that is configured to emit light rays (r1) according to a first range of wavelengths (w), wherein said at least one light source (10) is monochromatic and wherein said lighting device (1) further comprises: - at least one optical lightguide (11) with optical structures (110) that are configured to receive said light rays (r1) and to guide them according to respectively an orientation (o), - a stack (12) of at least one wavelength conversion layer (120) that is configured to receive said light rays (r1) according to said orientation (o) and to transform them into at least one light beam (b) according to at least one second range of wavelengths (w') so as to produce a global light beam (F).