Vehicular Lighting Device With Staggered Light Source Activation
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Solution Overview
Problem
Conventional vehicular lighting devices using multiple light sources for overlapping illumination lack the ability to provide an improved appearance and visibility, driver comfort, and safety, as they typically change brightness levels simultaneously rather than gradually.
Innovation Solution
A vehicular lighting device employing a first light source with high directionality, such as a laser diode, and a second light source with lower luminance, like an LED, that gradually turn on and off with different time periods to create a natural brightness change, improving visibility and safety by illuminating a wide area first and then focusing attention on the driving axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple light sources are controlled to turn on/off simultaneously based on common lighting instruction, then the control operation is simple, but the appearance quality and visibility improvement is limited
Solution Approach 1:
The control system segments the lighting control into separate channels for different light sources. The control device independently controls the first light source and second light source with different gradual change time periods, allowing differentiated brightness adjustment while maintaining relatively simple control architecture.
Solution Approach 2:
The system implements dynamic control by varying the gradual change time periods for different light sources. The first light source uses a longer gradual change time period than the second light source, creating a dynamic lighting transition that enhances appearance quality and visibility progressively.
2Speed
If the brightness of multiple regions is changed at the same time, then the response is fast, but the appearance quality and driver comfort is reduced
Solution Approach 1:
The control device applies preliminary action by first adjusting the brightness of the second light source (shorter gradual change time period) before completing the brightness adjustment of the first light source (longer gradual change time period). This staged approach creates a more natural and comfortable lighting transition for the driver.
3Illumination intensity
If the time difference between light sources is excessively large, then the gradual effect is more noticeable, but the visibility acquisition time is extended
Solution Approach 1:
The system optimizes the gradual change time periods as controllable parameters. The first light source is configured with a longer gradual change time period and the second light source with a shorter gradual change time period, creating an optimal balance between the gradual brightness effect and the total time required to achieve sufficient visibility.
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
This arrangement enhances the appearance and visibility by allowing the driver to grasp the overall situation and directs attention to the driving axis, improving safety by providing sufficient brightness within a 0.2 to 5-second time difference, reducing costs by using a common driving circuit for both light sources.
Implementation Method 1
a first light source (202A) structured to illuminate a first region (PN), a second light source (202B) structured to provide a lower luminance than that of the first light source, and to illuminate a second region (PB) that overlaps the first region and has a larger area than that of the first region
Implementation Method 2
a lighting circuit (300) structured to drive the first light source (202A) and the second light source (202B) according to a lighting instruction, and to gradually turn on the first light source (202A) and the second light source (202B) with different gradual change time periods in response to the lighting instruction
Data Source
AI summary
A first light source illuminates a first region. A second light source is configured to provide lower luminance than that of the first light source. The second light source illuminates a second region that overlaps the first region, and that has a larger area than that of the first region. A lighting circuit drives the first light source and the second light source according to a common lighting instruction. The lighting circuit gradually turns on the first light source and the second light source with different gradual changing time periods in response to the lighting instruction.