Vehicle Lamp Light Guide Layout for Uniform Converted Luminance
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Solution Overview
Problem
Vehicle lamps with multiple light sources and light guide plates experience luminance unevenness due to variations in light output from different sections, affecting the uniformity and appearance of the lighting.
Innovation Solution
A vehicle lamp design incorporating a light guide plate with multiple light-exiting portions and a low-luminance portion between them, along with wavelength conversion members that convert light from the light sources emitting in the 420-550 nm range to 540-700 nm range, ensuring uniform light output and reduced luminance unevenness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources are used to illuminate different sections of the light guide plate, then light can be extracted from multiple partitioned sections, but luminance unevenness occurs in the extracted light
Solution Approach 1:
The patent applies local quality by positioning wavelength conversion members (phosphors) at specific locations corresponding to each light source on the light guide plate. Each wavelength conversion member converts the wavelength of light from its associated light source, creating localized wavelength conversion zones. This ensures that light extracted from each section has consistent color characteristics, thereby reducing luminance unevenness while maintaining multi-section light extraction capability.
2Illumination intensity
If wavelength conversion members are positioned at specific locations on the light guide plate, then luminance unevenness is reduced, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the wavelength conversion function into multiple discrete wavelength conversion members, each positioned at specific locations on the light guide plate. Instead of using a single uniform wavelength conversion layer, the system segments the conversion function to match the segmented light source arrangement. This segmentation approach reduces luminance unevenness by providing localized wavelength control while keeping the overall structure manageable through modular positioning.
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 luminance unevenness across the light-exiting portions, enhancing the uniformity and appearance of the lighting, allowing for the output of light in specific color regions suitable for brake lights, taillights, and direction indicators.
Implementation Method 1
a wavelength conversion member configured to emit light in a specific color region by converting a wavelength of light exiting from each of the plurality of light-exiting portions
Data Source
AI summary
A vehicle lamp includes a light guide plate including a plurality of light-exiting portions and a low-luminance portion, which is located between adjacent light-exiting portions and outputs light having luminance lower than luminance of light exiting from the light-exiting portion; a plurality of light sources each emit light having a light emission peak wavelength in a range from 420 nm to 550 nm to enter the light guide plate; and a wavelength conversion member that is disposed on the plurality of light-exiting portions and emits light having a light emission peak wavelength in a range from 540 nm to 700 nm by converting a wavelength of the light exiting from the light-exiting portion.