Uniform Light Distribution in Vehicle Headlights

With the rapid development of LED technology, application luminaires in field lighting is becoming increasingly widespread. However, how to improve light efficiency and uniformity distribution remains a significant challenge. This paper takes luminaire products Shenzhen Starsteck Co. Ltd. as research object explores methods practices for optimizing optical design. By employing advanced design software optimization algorithms, combined with practical experimental verification, this proposes systematic process optimization. Experimental results show that optimized have achieved improvements both uniformity, not only enhancing quality but also improving user experience. study provides important references guidance luminaires, theoretical significance.

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Collimator array for projection devices in automotive headlights that reduces stray light and improves light distribution without adding external dividers. The collimators in the array are made as an integral unit from a translucent material. Laser processing is used to introduce interference structures between adjacent collimators to prevent light rays injected into one collimator from crossing into the adjacent one. This prevents light spillover and improves the collimation and directionality of the projection device.

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Simplified vehicle headlamp with adjustable light distributions using collimated light sources and aligned lenses. The lighting device has two collimator lenses with coaxial optical axes that focus to a common point. This allows adjusting the light distribution by moving the collimator lenses relative to each other. In one mode, the lenses are aligned for a combined beam. In another mode, one lens is offset to create a separate low beam. This avoids complex optics and multiple collimators. A light module has both collimators and a secondary low beam for adaptive lighting.

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Luminous module for vehicles that projects a uniform light field onto the ground near the vehicle, particularly next to the doors. The module has a light source, projection optic, and an element with variable light transmission between the source and optic. This variable transmission element allows adjusting the intensity of the projected light field to maintain uniformity as the angle of projection becomes more raking.

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Diffusion plate for backlight modules with low optical path distance to provide uniform light without Mura effects. The plate has surface layers and a main layer made by extrusion. The surface layers have higher refractive index than the main layer due to particle additives and microbubbles. This improves light diffusion. Microstructures on the surface separate concave regions for quantum dots. Water-blocking layers prevent moisture ingress. This prevents quantum dot degradation. The plate can also have films on the surfaces.

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LED module for uniform light output and a device using it. The module has LED elements arranged on alternating wiring patterns with protrusions. The protrusions have LEDs on them and are aligned alternately. This allows connecting all LED cathodes to one set of wiring and all anodes to another set, avoiding parallel connections that can cause uneven intensity. The module is fixed to a metal base with anode and cathode terminals to supply power.

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Vehicle lamp design with slim exterior and optimized beam pattern. The lamp has integrated light guiding lenses that receive light from multiple sources and direct it to form the beam. The lenses are arranged in line with the sources and integrated to eliminate gaps between them. This prevents stray light from escaping between lenses and ensures the light is guided and focused properly. The integrated lens design allows slimming the exterior without sacrificing beam quality.

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Vehicle lamp design that allows slim exterior aesthetics while maintaining optimal beam patterns. The lamp has multiple integrated light guiding lenses in front of the light sources. The lenses have an incident portion for light input, an exit portion to output the light, and a transmission portion between them. The exit portion is convex forward. This shape helps control light path and prevent stray light from exiting through the sidewalls.

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A headlight assembly for vehicles that provides seamless transition between high and low beam patterns without overlapping pixels. The headlight uses multiple projector units with independent pixel sources. Each projector generates its own pattern with defined edges. The pixels from adjacent projectors are precisely aligned and controlled to create a seamless transition between patterns. This avoids overlap and blurring issues of overlapping pixels. The separate projectors allow customization of pixel shapes and sizes.

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LED lamp with improved color mixing and uniformity across the beam. The lamp has a unique arrangement of multi-color LEDs in the emitter module, a double-sided lens with different lenslet patterns on each side, and a parabolic reflector with facets. This configuration thoroughly mixes the colors from the LED chains and provides uniform color throughout the output beam. The LEDs are scattered in an array so no same-color LEDs are in the same row/column. The parabolic reflector and lenslets further randomize the light rays for color mixing. Photodetectors inside the primary optics measure all LEDs' light to compensate for aging.

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Light-emitting device with improved luminance and reduced unevenness when multiple LEDs are arranged. The device uses an array of LEDs, transparent members, and electrodes. The LEDs have a light-extracting surface. The transparent members have a lower surface facing some LEDs. A covering surrounds the LEDs. The electrodes are below. They connect to LEDs in columns and have alternating polarity. This configuration allows some LEDs to emit light through the transparent members while others are covered. The alternating polarity prevents adjacent LEDs from emitting simultaneously. This reduces unevenness compared to uncoordinated LEDs. The transparent members and covering improve overall luminance.

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A simplified vehicle headlamp design that eliminates the need for mechanical switching of cutoff shields. The headlamp uses a fixed light path processing element with a cutoff portion. The element can be a reflecting plate or light shielding plate. The cutoff is positioned at the convergence point of low beam light rays. This allows the low beam and high beam sources to be positioned symmetrically around the cutoff when viewed from the lens focal point. This creates the desired cutoff line without mechanical shield movement.

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Indirect lighting system for transportation applications like headlights, taillights, and logo displays that provides uniform, consistent light without the visible image of the light source. The system uses a coated surface to convert and emit light at a different color and angle compared to the original emitted light. This involves a light source, reflector, and coated surface. Light from the source impinges on the reflector to change direction. Then, light from the reflector impinges on the coated surface to excite it and emit a different colored, changed angle light. This indirect conversion prevents the light source image in the final output.

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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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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 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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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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