Pixel Headlamp Shading Using Horizontal ROI Stabilization
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Solution Overview
Problem
ADB control systems face challenges in maintaining stable vertical vehicle ROI information due to vehicle vibration, leading to inconsistent shading that causes bother for drivers and other road users.
Innovation Solution
A vehicle lamp apparatus with individually luminance-controllable pixels and a controller that adjusts pixel illumination based on stable horizontal ROI information, using a horizontal reference line to stabilize the shade area, regardless of vertical ROI fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ADB control uses vehicle ROI information for shading, then high beam illumination can be provided with reduced glare to preceding vehicles, but vehicle vibration causes vertical ROI information to become unstable, creating bother for drivers
Solution Approach 1:
The patent extracts only the horizontal component of ROI information (left end and right end positions) while discarding the vertical component. This selective extraction eliminates the instability caused by vertical vibrations while retaining the useful shading function for preceding vehicles.
Solution Approach 2:
Instead of using the conventional approach of using full vertical ROI information to define the bottom of the shading area, the patent inverts the approach by using a fixed horizontal reference line (cutoff line) as the boundary, regardless of vertical ROI fluctuations.
2Object-affected harmful factors
If ADB control creates shading area based on vehicle ROI information, then glare reduction is achieved, but inconsistent vertical positioning causes bother for drivers and other road users
Solution Approach 1:
The patent inverts the conventional shading approach by making the horizontal reference line (cutoff line) the fixed boundary instead of using the variable bottom end of vehicle ROI. This ensures consistent shading positioning that does not fluctuate with vehicle vibrations.
Solution Approach 2:
The patent uses a standardized horizontal reference line (cutoff line) as a template that remains constant, replacing the variable vertical boundaries from ROI information. This copying of a stable reference ensures consistent shading behavior.
3Illumination intensity
If high beam illumination is used to illuminate wide and far front area, then driver visibility is improved, but glare is caused to other road users
Solution Approach 1:
The patent applies local quality by creating a shading area with specific horizontal boundaries (left end and right end positions) that selectively blocks light in the direction of preceding vehicles while maintaining high beam illumination in other directions. This localized shading reduces glare to specific road users without compromising overall visibility.
Data Source
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AI summary
A variable light distribution lamp 110 has a plurality of independently luminance-controllable pixels 112. The variable light distribution lamp 110 is structured to illuminate an area 10 for high beam light distribution, with a first beam BM1 ascribed to luminance distribution of the plurality of pixels 112. A controller 130 is structured to receive, from a vehicle in a high beam mode, shade information that represents a left end position and a right end position in a horizontal direction of an area to be shaded, and to turn off at least one pixel, among the plurality of pixels, which is above a reference line and between the left end and the right end.