Anti-Glare Systems in Automotive Headlights

The high risk of glare from vehicle headlights at night often becomes a significant contributor to traffic accidents, particularly for motorcyclists and drivers lightweight vehicles. To address this issue, smart glare-blocking system based on PDLC (Polymer Dispersed Liquid Crystal) film has been developed. This research proposes the design, development, testing integrated with an LDR (Light-Dependent Resistor) sensor automatically detect light intensity adjust film's opacity in real-time. goal is enhance driver visibility comfort without compromising overall road safety. experimental setup involved placing prototype varying distances (09 meters) controlled source night. Measurements were conducted collect data intensity, voltage output, resistance LDR, degree attenuation achieved by film. results showed that distance 1 meter, could block up 99.85% incoming light, reducing 12080 Lux only 17 Lux. Moreover, began react 6 meters output 34V. It became fully transparent 89 50V. findings demonstrate functions effectively detecting potential its impact before it reaches driver's eyes. ... Read More

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Headlamp design for vehicles that improves illumination of the edge regions outside the vehicle's path without blinding oncoming traffic. The headlamp has an adaptive light distribution that can shift the focal point to the edges instead of always centering it. This is achieved by controlling the LED pixels and optical elements in the lamp. The control signal adjusts the light spots and optics to create a fan-shaped illumination pattern with progressively lower intensity further ahead. This concentrates brightness in the edges where it's needed, like sidewalks, while keeping the center less intense to avoid glare. The edge regions have isolines of equal illumination angled to the horizontal. The boundary between edge and main beam is adjusted based on vehicle track detection to favor illumination outside the lane.

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Dynamic attenuation of light transmissibility of localized portions of a vehicle windshield to reduce glare without relying on polarizing filters on other vehicles' headlights. The windshield has a polarizing layer with nanostructures that can change phase when voltage is applied. Cameras detect light sources and occupant positions. The windshield zones corresponding to headlights are activated to attenuate light there. This reduces glare without requiring other vehicles to have polarizing filters. The windshield zones can also be adjusted based on camera data to account for interior light sources.

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Vehicle lamp design to improve beam pattern and reduce glare without additional shields. The lamp has a light source, an optical path adjustment unit, and an optical unit with multiple incident and exit lenses. The key difference is that the ratio of lens parameters like focal length between the exit and corresponding incident lens is different for some lenses compared to others. This allows optimizing light distribution and preventing glare without needing additional shields.

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An illumination apparatus with shielding to control beam spread and reduce glare. The apparatus has a housing, a light source, a lens system, and a shield. The light source emits light into the housing. The lens forms an image on an internal plane. The shield is between the light source and housing opening. It has an opening to allow light to pass. The outermost beams of the light spread less after passing through the shield opening compared to before. This reduces beam spread and glare.

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A lighting unit for a vehicle headlight that provides proper overhead illumination without glare in adaptive driving beam (ADB) mode. The unit has an independent switchable light source and an optical assembly to deflect the light. When the main ADB headlight shades the overhead area, the separate light source is activated to illuminate the overhead with a defined, spatially limited area above the cutoff line. This prevents glare while maintaining minimum overhead illumination.

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LED lens for improved color mixing and glare reduction. The lens has a cylindrical entry with a tapered sidewall and diffusion treatment near the LEDs. This collimates some light while mixing colors. The outer region has a straight sidewall and no diffusion. It diffuses and scatters light as it exits the lens. This surrounds the collimated inner light to give better mixed output. The lens shape is a compound parabolic concentrator (CPC) with a concave exit. This concentrates light from the side while spreading it from the center. The CPC also helps reduce glare by internally reflecting light back into the lens. The lens can be used in LED lighting applications to improve color rendering and reduce glare compared to conventional collimating lenses.

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Reducing glare for vehicle occupants caused by headlights of oncoming vehicles by coordinating the flickering of headlights and shuttering of windows between vehicles. When multiple vehicles receive a common signal, they derive a synchronized clock signal based on it. Vehicles then alternate between high and low window transparency and headlight intensity according to the clock. This allows vehicles to use high intensity headlights while reducing glare for occupants of opposing vehicles by coordinated flickering.

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A vehicle lighting system that improves headlight brightness and reduces glare by using lasers and scanning mirrors. The system has two laser sources, two scanning mirrors, and a shared phosphor plate. The lasers are scanned and converge at the phosphor plate. This allows longer optical paths through the brightness correction lenses to improve brightness. The lasers intersect at the phosphor plate with one hitting the lower region and the other hitting the upper region. This distributes the lasers over more of the phosphor plate for better brightness correction.

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Headlamps are essential for safe night driving, as they must provide sufficient brightness to illuminate the road while minimizing glare other drivers. Designing low-beam optics is more complex than general lighting due need a high-contrast cutoff line, with brightest point positioned near its edge. This challenge becomes even greater when working compact optical systems. In this paper, we propose robust design address issue effectively. We develop bicycle headlamps using cylindrical lens array (CLA) combined reflective create specialized light pattern. The CLA spreads pattern horizontally form line; however, alone does not ensure optimal performance. To overcome limitation, introduce novel principle: generated by reflector, before passing through CLA, should be inverse-triangular or trapezoidal. approach enables shift upward and closer solving key in previous designs.

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In addressing the design imperatives of automotive headlight miniaturization and energy conservation, this paper puts forth a methodology for vehicle lighting systems that is predicated on free surface optics an intelligent optimization algorithm. The establishment mapping relationship between light source target relevant performance standards. numerical calculation then integrated with MATLAB R2022a to obtain free-form coordinate points establish three-dimensional model. To optimize parameter design, genetic algorithm employed fine-tune max, thereby attaining optimal max strikes balance volume luminous efficiency. experimental results demonstrate by integrating incidence angle into high beam low beam, final simulation show optical efficiency 88.89%, 89.40%. This enables headlamp system achieve lamp framework proposed in study provides reference compact system.

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Vehicle lamp design that reduces the visibility of scattered light from the lamp to prevent glare for pedestrians and drivers. The lamp projects light onto the ground beside the vehicle using an optical system with a concave mirror. The mirror position is set so that the lower part of the mirror is higher than the window. This hides the lower part of the mirror from view when the lamp is mounted on the vehicle. This prevents scattered light from the mirror being seen. The upper part of the mirror reflects the light downward through the window. This reduces the chance of scattered light from the mirror being visible to people around the vehicle.

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Light emitting module for headlamps with reduced glare and improved dark zone control in adaptive driving beam (ADB) systems. The module uses wavelength converters on top of the LED chips with angled sidewalls of 80 degrees or less. The converters have narrow spacing, 100 microns or less, and their edges have low luminance. A white wall surrounds the LEDs and converters. This configuration prevents light leakage between converters and reduces glare compared to flat converter edges. It allows precise dark zone control for ADB headlamps without excessive light emission.

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LED headlight retrofit lamp that reduces glare and improves visibility compared to conventional LED headlights. The lamp has two LEDs, one on each side, with different color temperatures. The higher temperature LED emits light towards oncoming traffic while the lower temperature LED illuminates the road. This separates glare from high temp light for oncoming drivers and better visibility from lower temp light for the driver's own use.

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Method to dynamically adjust the lighting area of vehicle headlights using a pressure control device and astigmatism agent in the headlight housing. The method involves delivering astigmatism to the housing when headlights are turned on to increase light spread angle. This prevents excessive lighting that can blind other drivers. The astigmatism is removed when the lights are off to reduce spread angle. An MCU controls the pressure device to manage astigmatism delivery and removal.

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An automotive headlight with improved low beam cutoff line and increased 75R illumination. The headlight uses an optical system with an LED source, reflective device, and lens. The reflective device reflects the LED light forward and the lens focuses it. The cutoff line is formed by an inwardly concave corner on the illumination area. This creates a bright and dark low beam without dazzling oncoming drivers. The reflective device is symmetrically arranged around the LED to increase light usage.

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LED optical system that provides glare-free lighting with high efficiency and brightness. The system uses a converging light concentrator and a large-area reflector to shape the light beam. The LEDs emit into the concentrator which focuses the light into a narrow beam. This beam is then reflected off the large reflector into a wider, dispersed beam. The converged beam does not intersect the dispersed beam, preventing glare. This allows bright, focused light from the LEDs without causing discomfort or disability glare. The concentrated light improves efficiency compared to diffused lamps.

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Outdoor lighting device for automobiles with low glare to provide efficient lighting without causing discomfort to the eyes of surrounding users. The device has a lamp housing with a frosted glass cover over the equipment box. Inside the box, frames slide vertically on rails with LED panels fixed between them. The frames in the middle have control panels. A double-headed screw connects the frames and slides. This allows the LED panels to move vertically and rotate slightly to adjust the light distribution. The frosted glass cover reduces glare. The device can also have photovoltaic panels on the roof to charge internally.

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Variable light distribution for vehicle headlights using LED arrays and mirror arrays to provide adaptive beam patterns for different driving conditions. The headlights have an LED array, a mirror array in front of it, and a projection lens. The mirror array can be driven to change the light path. In one configuration, a central mirror and outer mirrors reflect light from the LEDs through the projection lens to focus on-center. This provides central concentration without blocking. In another configuration, outer mirrors reflect to center for high beam intensity. The mirrors can also swivel for road inclination compensation.

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A vehicle headlamp that provides proper low beam illumination, including a zone III beam, to avoid glare for oncoming drivers without using a shutter. The headlamp has two light sources—one for low and one for high beams. Optics shape the beams from each source. The low beam optics have two parts—one redirects light below the cutoff line, and the other redirects light above the cutoff to create a zone III beam.

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