Vehicle Lamp Luminance Control for Glare Reduction
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Solution Overview
Problem
Conventional vehicle lamp systems indiscriminately lower luminance over the same period of time when reducing glare to oncoming vehicles or pedestrians, which can cause discomfort for drivers due to rapid changes in brightness.
Innovation Solution
A vehicle lamp system that controls the luminance of light-emitting elements by gradually lowering it in a first period when turning off and in a second, longer period when reducing to a lower, non-zero luminance, allowing for more controlled and comfortable light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the luminance is gradually lowered in the same period of time regardless of whether the light-emitting element is turned off or reduced to a lower luminance, then the control is simplified, but the driver comfort deteriorates due to rapid brightness changes
Solution Approach 1:
The patent applies dynamics by making the luminance lowering period variable rather than fixed. The control unit dynamically adjusts the luminance lowering period based on the target luminance level: using a first period when turning off the light-emitting element and a second period (longer than the first) when reducing to a lower luminance. This dynamic adjustment resolves the contradiction by adapting the control parameters to different operational states, thereby improving driver comfort without significantly complicating the control system.
2Illumination intensity
If the high beam provides better visibility for the driver, then the visibility is improved, but glare is caused to leading vehicle or oncoming vehicle or pedestrian
Solution Approach 1:
The patent applies local quality by differentiating the luminance lowering process based on the target luminance state. Instead of applying a uniform lowering period to all cases, the control unit applies different lowering periods (first period for turning off, second period for reducing to lower luminance) depending on the specific operational requirement. This localized differentiation allows the system to maintain high visibility when needed while minimizing glare to other road users and pedestrians.
Data Source
AI summary
A vehicle lamp system includes a lamp unit and a lamp control unit. The lamp unit includes a plurality of LEDs and forms a high-beam light-distribution pattern. The lamp control unit controls the on/off of each of the plurality of LEDs. The lamp control unit controls each LED in the following manner. Specifically, the luminance is gradually lowered in a first period when the luminance is lowered to a level at which the LED remains on at reduced luminance. The luminance is gradually lowered in a second period, which is shorter than the first period, when the luminance is lowered to a level at which the LED is off.