Uniform Light Distribution in Vehicle Headlights

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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Angularly varying light emitting devices (AVLEDs) that can optimize illumination or irradiation by independently adjusting the light flux and spectral content for multiple angular bins. The AVLEDs have electronically controllable light output that varies angularly. This allows focusing light in specific directions while reducing glare and shadows. The AVLEDs can have sensors, cameras, and positioning systems to enable autonomous optimization based on environment data. The AVLEDs can also have axially redirecting optics to further customize the angular light distribution.

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Light emitting module with reduced stray light on the irradiation surface. The module has a lens over the light source, and a cover over the lens. The cover has three regions: an inner region where light from the lens enters, a middle region around the inner region with higher diffusion, and an outer region. This configuration reduces stray light by having the cover's middle region with higher diffusion surrounding the inner region where light from the lens enters, preventing light from escaping sideways.

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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 θmax, thereby attaining optimal θmax 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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Vehicle with integrated road surface rendering capability that enhances visibility while driving. The vehicle includes a projection member, an external camera, and circuitry. The projection member projects light onto the road surface to create a rendered image, while the external camera captures the original image of the road surface. The circuitry analyzes the captured image to determine the road surface's reflection state and suppresses the projection light for the rendered image, maintaining optimal visibility while driving.

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Outdoor lighting arrangement for improving visibility at crossings and intersections without increasing light level or causing glare. The lighting arrangement has two light sources, one for positive contrast and one for negative contrast. Modulating optical elements convert the light into patterned beams that illuminate separate target surfaces. This provides separate contrast adjustment for objects on each surface. A cover plate with the modulating elements is used to shape the beams. Multiple light sources can be used to create dynamic patterns. The separate contrast control improves visibility without increasing overall light levels, avoiding glare and disability issues.

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Motor vehicle lighting system that uses radial LEDs and segmented reflectors to create legal-compliant matrix displays with high light intensity and sharpness. The LEDs emit light radially instead of forward, avoiding bright spots. Segmented reflectors divide the reflector into sections matching each LED. Light emitted by the radial LEDs is reflected by the segments and passes through the optical pane. This avoids the pixelated appearance of matrix displays with forward-emitting LEDs.

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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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Compact linear lighting arrangement with targeted beam output to prevent glare. The arrangement has an elongated lens body with recesses on one side. LED arrays are positioned in the recesses. The other side has angled surfaces. This asymmetrical shape focuses the LED light into a directed beam. The recesses and angled side prevent glare. The angled side can also have reflective sections to further shape the beam. The lighting arrangement can have multiple independent LED arrays, different light emissions, curved lens shapes, and flexible sections for transport and mounting.

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A heads up display (HUD) for vehicles that reduces ghosting by using an absorbing polarizer between the HUD projector and windshield. The polarizer allows light polarized in a certain direction to pass and absorbs light polarized in the orthogonal direction. This prevents ghost images caused by reflections off the windshield. The polarizer orientation is adjusted so the transmitted light ray from the HUD to the windshield is parallel to the windshield normal there, and the absorbing direction is parallel to the windshield normal at the reflection point. This aligns the polarization for transmission and reflection.

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Glazing assembly for vehicles with an integrated light source that prevents scattered light in the edge region. The assembly has a pane with a light source, a light outcoupling means, and a laminated pane structure. An absorption layer made of an opaque thermoplastic material is added in the edge region to absorb any light that couples into the pane and doesn't exit. This prevents scattered light from the edge. The absorption layer overlaps the pane surfaces and covers at least part of the edge. It can also extend around the entire perimeter. The laminated pane has a central see-through area with no cover layer.

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Vehicle lamp with improved lighting distribution to reduce glare for drivers. The lamp has multiple reflectors with multiple light sources in each reflector. The light distribution pattern from all the sources through the reflectors has a shape that tapers narrower towards the outer vehicle side. One of the sources is at the reflector focal point, and the other is shifted towards the inner side. This reduces outer side light intensity compared to conventional lamps, mitigating glare from reflection objects like signs.

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Automatic mirror anti-glare control without an internal light sensor by using a camera to detect external luminance and adjust mirror reflectance accordingly. The controller captures a rearview image, determines the external luminance from it, and sets the mirror reflectance based on that. This allows automatic anti-glare adjustment without requiring an internal light sensor in the mirror.

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Integrating scattering particles into phosphor layers of LEDs in a display or lighting application to enable uniform mixing of different light sources in the far-field. The scattering particles broaden or narrow the luminance line profiles of the LEDs so that when multiple spectrally distinct LEDs share an optic like a projection lens, they mix uniformly in the far-field without secondary optics. The scattering particles can be integrated into specific LED phosphor layers or used separately.

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Vehicle with adaptive headlight range control to improve visibility at different speeds. The vehicle has a headlight that can change its illumination pattern based on vehicle speed. At lower speeds, the headlight provides a wider illumination angle to better illuminate near objects. At higher speeds, the headlight narrows the beam to avoid glare from distant objects. This adaptive range adjustment improves visibility by matching the headlight pattern to the needs of the driving situation.

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Surface light guide for vehicle lights that provides homogeneous illumination with high efficiency. The light guide has a section to couple light from the source and a deflection section with small light decoupling elements. The elements deflect and extract the coupled light to the surface. This avoids point source artifacts and provides uniform illumination. The decoupling elements are closely spaced micro-optics that blend into an even surface. The guide section thickness reduces towards the end to match wall thickness needs.

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A vehicle headlight system with improved light distribution. The system uses a unique beam conversion element to shape the light output from the headlight source. The conversion element has a central curved region that disperses light into a diffused pattern, surrounded by a flat region that concentrates light into a focused beam. This allows the system to produce both a concentrated high beam and a wider dispersed low beam from the same headlight source. The curved and flat regions of the conversion element optimize the light distribution for different driving conditions.

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Motor vehicle headlight with improved illumination device that provides uniform lighting with reduced glare. The headlight has a dipped beam projection system with a bulb shield and a lens. The lens has an optical device with multiple freeform lenses to direct some light above the asymmetrical cutoff line of the dipped beam. This compensates for the shadowing by the shield and improves illumination of areas above the cutoff line without excessive glare.

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