High-energy-efficiency optical system for an LED-based headlamp architecture

Ge, Aiming; Wang, Wei; Du, Zhengqing; Qiu, Peng; Wang, Junwei; Cai, Jiajun

doi:10.1364/ao.52.008318

Cited by 25 publications

(17 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These high-contrast cutoff lines are applicable to cars [3][4][5][6][7][8][9], motorcycles [10], and even bicycles [11][12][13][14]. In general, most designs apply reflection [3,5,8], projection [6,7,10], and refraction [4,9] to produce a high-contrast cutoff line. By using a combination of various optical principles to design a freeform lens, Chen et al obtained a highly efficient head lamp to project a high-contrast cutoff line [4].…”

Section: Introductionmentioning

confidence: 99%

Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Lin

Sun

et al. 2019

Crystals

View full text Add to dashboard Cite

To the best of our knowledge, this is the first demonstration of a design for a bicycle head lamp with a high-contrast cutoff line using an atypical white light-emitting diode (LED) with two separate dies. The precise optical model was created by setting the weighting factor on the emitting surface. The downward reflector was designed and fabricated to produce a high-contrast cutoff line in both short- and long-axis orientations, but a yellowish outer pattern was observed. A modified two-color optical model was created to describe the yellowish patterns in both orientations and explain the yellowish effect. Such an effect was caused by the larger coverage area of the phosphor than that by the blue dies. To reduce the yellowish effect near the cutoff line, a specific phosphor area was blocked in the experiment. The yellowish effect was greatly reduced, and the contrast across the cutoff line was enhanced. The presented technology is useful for designing a high-contrast light pattern with such an atypical white LED.

show abstract

Section: Introductionmentioning

confidence: 99%

Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Lin

Sun

et al. 2019

Crystals

View full text Add to dashboard Cite

show abstract

“…Therefore, subsequent studies have focused on the modulating function of low/high beams. In terms of light source choice, LED has been widely used as a lighting source in the auto lamp market, and a wave of using lasers as an illumination source has recently emerged [7][8][9][10][11][12][13][14]. Laser headlamps have most of the advantages of LED headlamps, such as fast response, low brightness attenuation, small size, low energy consumption, and durability.…”

Section: Introductionmentioning

confidence: 99%

Laser Headlamp with a Tunable Light Field

Tseng

Chen

et al. 2019

Energies

View full text Add to dashboard Cite

This study developed an optical module for laser headlamps with a tunable light field. Laser headlamps have high and low beam lighting functions that are applied by changing the numbers of unit headlamps. For regulatory validation, we validated the project in accordance with the Regulation No. 112 of the Economic Commission for Europe (ECE) to determine whether the results meet the regulatory requirements or not. The proposed design increased the lighting distance by 2.14 times and decreased the size of the mechanism by 45% relative to the values for LED headlamps. High and low beam lighting functions were provided by the same laser sources.

show abstract

“…Illumination is the deliberate use of light emitted from a source (or multiple sources) to achieve a practical or aesthetic effect, such as indoor lighting, [1][2][3][4][5] outdoor lighting, [6][7][8][9][10][11][12][13][14] automotive lighting, [15][16][17][18][19][20][21][22] etc. [23][24][25][26][27] In practical applications, it may require different distributions of light to achieve different lighting effects.…”

Section: Introductionmentioning

confidence: 99%

Design of Freeform Illumination Optics

Feng

Zheng

et al. 2018

Laser & Photonics Reviews

131

View full text Add to dashboard Cite

Freeform optics constitutes a new technology that is currently driving substantial changes in illumination design. It liberates designers and engineers from restrictions of optical surface geometry, enabling them to achieve compact, lightweight, and efficient illumination systems with excellent optical performance. Freeform optics is currently used widely for both fundamental research and practical applications. This Review focuses on the design of freeform illumination optics, which is a key factor in advancing the development of illumination engineering. The design methods of freeform illumination optics can be divided into two groups: zero‐étendue algorithms based on ideal source assumption and design algorithms for extended light sources. The zero‐étendue algorithms include ray mapping method, Monge–Ampère equation method, and supporting quadric method. The algorithms for extended sources include illumination optimization, feedback design, and simultaneous multiple surfaces method. The characteristics and limitations of these design methods are illustrated and a summary of these methods with future outlooks is also given.

show abstract

High-energy-efficiency optical system for an LED-based headlamp architecture

Cited by 25 publications

References 8 publications

Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Design of a Bicycle Head Lamp Using an Atypical White Light-Emitting Diode with Separate Dies

Laser Headlamp with a Tunable Light Field

Design of Freeform Illumination Optics

Contact Info

Product

Resources

About