Reflective Light Source Layout for Uniform Instrument Luminance
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Solution Overview
Problem
In vehicle instruments with unevenly-shaped planes, existing light source devices often result in uneven luminance due to irregular arrangement of light sources at the periphery.
Innovation Solution
A light source device with a substrate and a reflective member featuring through holes for light sources, ensuring uniform luminance by using light sources with batwing light distribution characteristics and a reflective film to broaden light emission and reduce direct upward emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If light sources are arranged regularly at the outer periphery of the instrument, then the structure is simple and easy to manufacture, but the luminance becomes uneven in unevenly-shaped planes
Solution Approach 1:
The patent applies local quality by making the light distribution characteristics location-dependent. Light sources at different positions (corner vs. edge vs. center) have different batwing distribution parameters to compensate for their specific geometric environments. This allows each light source to be optimized for its local position, achieving uniform overall luminance across the unevenly-shaped plane while maintaining a regular arrangement pattern.
Solution Approach 2:
The patent changes the parameters of light distribution by using batwing distribution with可调 parameters. By adjusting the batwing distribution parameters for different light sources based on their positions, the system achieves uniform luminance output. This parameter adjustment allows the same regular arrangement structure to produce uniform illumination in unevenly-shaped planes.
2Illumination intensity
If light sources are arranged irregularly to match unevenly-shaped planes, then the luminance becomes uniform, but the arrangement complexity increases
Solution Approach 1:
The patent maintains regular arrangement structure while achieving uniform luminance by applying local quality through position-dependent batwing distribution parameters. This approach avoids the complexity of irregular arrangement by keeping the geometric positions regular, but compensates for local geometric variations through parameter adjustment of each light source's emission pattern.
Solution Approach 2:
Instead of changing the spatial arrangement parameters (positions), the patent changes the emission parameter parameters (batwing distribution characteristics) of the light sources. This parameter substitution allows uniform luminance to be achieved while maintaining the simplicity of regular geometric arrangement, thereby reducing overall device complexity.
3Device complexity
If conventional light sources are used, then the device structure is simple, but the luminance distribution is uneven and direct upward emission is high
Solution Approach 1:
The patent changes the emission parameter characteristics of the light sources by using batwing distribution instead of conventional isotropic or uniform distribution. This parameter change in light emission pattern reduces direct upward emission and creates a more uniform luminance distribution across the unevenly-shaped plane, while the overall device structure remains relatively simple.
Solution Approach 2:
The patent applies local quality by using position-dependent batwing distribution parameters for different light sources. This allows each light source to have optimized emission characteristics for its specific location, achieving uniform overall luminance distribution while maintaining structural simplicity through the regular arrangement of light sources.
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 configuration provides uniform luminance across unevenly-shaped planes by reflecting light emitted from light sources with batwing distribution, reducing luminance unevenness and allowing for local dimming and high dynamic range control.
Implementation Method 1
a reflective member arranged on the substrate via an adhesive member. The reflective member defines a plurality of through holes. The light sources are respectively disposed inside the through holes in a plan view. The adhesive member is light-reflective.
Data Source
AI summary
A light source device includes a plurality of light sources, a substrate on which the light sources are arranged, and a reflective member arranged on the substrate via an adhesive member. The reflective member defines a plurality of through holes. The light sources are respectively disposed inside the through holes in a plan view. The adhesive member is light-reflective.