Beam Pre-Shaping Methods Using Lenslet Arrays for Area-Based High-Resolution Vehicle Headlamp Systems

Li, Yang; Knöchelmann, Marvin; Lachmayer, Roland

doi:10.3390/app10134569

Cited by 5 publications

(3 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The combination of LED array and lens array is also one of the more popular research directions. Knöchelmann explained that the small lens array based on the Kohler illumination principle can effectively homogenize the light and shape it into a rectangle at the same time [60].…”

Section: Existing Measures To Deal With System Stability Of High-resolution Headlampsmentioning

confidence: 99%

High-Resolution Pixel LED Headlamps: Functional Requirement Analysis and Research Progress

Wang

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

High-resolution pixel LED headlamps are lighting devices that can produce high-resolution light distribution to adapt to road and traffic conditions, intelligently illuminate traffic areas, and assist drivers. Due to the complexity of roads and traffic conditions, the functional diversity of high-resolution pixel LEDs headlamps and traffic safety has come into question and is the subject of in-depth research conducted by car manufacturers and regulators. We summarize the current possible functions of high-resolution pixel LED headlamps and analyze ways in which they could be improved. This paper also discusses the prospect of new technologies in the future.

show abstract

Section: Existing Measures To Deal With System Stability Of High-resolution Headlampsmentioning

confidence: 99%

High-Resolution Pixel LED Headlamps: Functional Requirement Analysis and Research Progress

Wang

et al. 2021

Applied Sciences

View full text Add to dashboard Cite

show abstract

“…In parallel, recent booming progress in artificial intelligence and sensor fusion have evolved ADB systems towards highlighting road objects and projecting symbols to communicate with other traffic participants. The driver is allowed to obtain information about the vehicle’s surroundings by illumination marks, further enhancing road safety [ 6 , 7 , 8 , 9 ]. As the complexity of the external environment and road conditions increases, vehicle smart headlights are constantly developing.…”

Section: Introductionmentioning

confidence: 99%

Piezoelectric MEMS Mirror with Lissajous Scanning for Automobile Adaptive Laser Headlights

Yao

Liu

et al. 2022

Micromachines

View full text Add to dashboard Cite

The emergence of smart headlights with reconfigurable light distributions that provide optimal illumination, highlight road objects, and project symbols to communicate with traffic participants further enhances road safety. Integrating all these functions in a single headlight usually suffers from issues of bulky multi-functional add-on modules with high cost or the use of conventional spatial light modulators with low optical efficiency and complex thermal design requirements. This paper presents a novel laser headlight prototype based on biaxially resonant microelectromechanical systems (MEMS) mirror light modulator for mapping blue laser patterns on phosphor plate to create structured white illumination and tunable road projection. The proposed headlight prototype system enables reconfigurable light distribution by leveraging laser beam scanning with fewer back-end lens and simple thermal design requirements. Built with thin-film lead zirconate titanate oxide (PbZrTiO3) actuators, the MEMS mirror achieved high-frequency biaxial resonance of 17.328 kHz, 4.81 kHz, and optical scan angle of 12.9°. The large mirror design of 2.0 mm facilitates more refined resolvable projection pixels, delivers more optical power, and provides moderate optical aperture to possibly serve as the common spatial light modulator of headlight and the light detection and ranging (LiDAR) towards all-in-one integration. The carefully designed bi-axial resonant frequency improves the device’s robustness by offsetting the lowest eigenmode away from the vehicle vibration. By establishing the laser headlight prototype systems of both 1D and 2D scanning modes, a mathematical model of laser modulation and MEMS electrical control principles of Lissajous scanning are proposed to tune the projection pattern density and shapes. It laid the foundation for developing a laser scanning control system with more complex project functions and prompting the application of MEMS for compact headlight system that addresses night driving visibility, eliminates glare effect, and renders interactive projection capabilities.

show abstract

“…On-road projections are an upcoming technology to assist the driver in critical situations and enable communication between autonomous driving vehicles and other road users [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35]. Initial studies show that on-road projections increase road safety for drivers, especially for inexperienced ones [36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Distraction Potential of Vehicle-Based On-Road Projection

et al. 2021

Self Cite

View full text Add to dashboard Cite

With regard to autonomous driving, on-road projections cannot only be used for communication with the driver but also with other road users. Our study aims to investigate the distraction potential for other road users when on-road projections (e.g., for driver assistance) are used to communicate with the driver of the projecting vehicle. We perform this investigation in a blind study with 38 test persons who are overtaken six times on a constant motorway section by the projection vehicle. The distraction potential is examined with an eye-tracking system, which detects the direction of the subjects’ gaze. In addition, the subjects’ physiological perception of the headlight projection is recorded with a questionnaire afterward. Several test subjects looked at the projection for less than one second, which is well below the critical threshold for the distraction of 1.6 s. In the interviews, on the other hand, only one of the 38 test persons stated that a projection on the road was recognized. For the examined scenario, it is therefore deduced that on-road projections with the selected symbol shape and brightness do not lead to critical distraction.

show abstract

Beam Pre-Shaping Methods Using Lenslet Arrays for Area-Based High-Resolution Vehicle Headlamp Systems

Cited by 5 publications

References 23 publications

High-Resolution Pixel LED Headlamps: Functional Requirement Analysis and Research Progress

High-Resolution Pixel LED Headlamps: Functional Requirement Analysis and Research Progress

Piezoelectric MEMS Mirror with Lissajous Scanning for Automobile Adaptive Laser Headlights

Distraction Potential of Vehicle-Based On-Road Projection

Contact Info

Product

Resources

About