Design of LED edge-lit light bar for automotive taillight applications

Yu, Jyh-Cheng; Chen, Jia-Hao; Liu, Shih-Chiang

doi:10.1117/12.2024842

Cited by 6 publications

(13 citation statements)

References 6 publications

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“…2. The illuminance uniformity can then be controlled by manipulating the distribution of v cuts [13]. However, if the light bar is curved, additional attention needs to be paid to the cross section illuminance uniformity between the inner and outer parts of the curved section.…”

Section: Introductionmentioning

confidence: 99%

Optical design and optimization of planar curved LED end-lit light bar

Chen

Kao

2014

Appl. Opt.

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This study investigates the optical design of planar curved LED end-lit light bars using v cuts as light-diverting structures. The application of LEDs in automotive lighting has become popular, especially in signal lamps and daytime running lamps. Most designs adopt a direct back light using arrays of LEDs with diffusive coupling optics, which often causes problems such as low uniformity, glaring, and excessive LEDs. Edge-lit LED light guides in automotive applications share a similar principle with the light-guide plates in back-light models of LCD but with much more complicated geometry. However, related literature on the optical design of nonrectangular light-guide plates is very limited. This study addresses the design of planar curved LED end-lit light bars and the optimization scheme for illuminance uniformity. V cuts are used as the optical coupling features, and the lead angles of the v cuts are varied to achieve optimum axial luminous intensity. This study presents a solution to reduce the illuminance difference between the inner and the outer portions of curved light bars by introducing gradual taper v cuts across the curved section. A line graph with preselected anchor points is proposed to define the size distribution of evenly spaced v cuts along the light bar. A fuzzy optimization scheme is then applied to iterate the anchor size to achieve illuminance uniformity. The designs of a planar curve light bar with a rectangular cross section and a light-guide ring with a circular cross section are presented to illustrate the design scheme.

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Section: Introductionmentioning

confidence: 99%

Optical design and optimization of planar curved LED end-lit light bar

Chen

Kao

2014

Appl. Opt.

Self Cite

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“…Note that, in order to easily explain the method, in this study the LIDC has azimuthal symmetry; however, depending on the requirement of each illumination design, the LIDC can also be out of azimuthal symmetry. LED applications often achieve the specified illumination at the target plane [1][2][3][4][5][6][7][8][9][10][11]. In this sample design, the illuminator hopes to achieve a uniform illuminance distribution at a target illumination area, as Fig.…”

Section: Finding Effects Of All Variables Separatelymentioning

confidence: 99%

“…Because of the advantages over incandescent light sources, such as lower energy consumption, longer lifetime, smaller size and faster switching, light-emitting diodes (LEDs) are now widely used in road lighting [1,2], automotive lighting [3,4], interior lighting [5] and LCD backlighting [6]. LED applications often achieve the specified illumination at the target plane.…”

Section: Introductionmentioning

confidence: 99%

One-time ray-tracing optimization method and its application to the design of an illuminator for a tube photo-bioreactor

Chu¹,

Yang²,

Liao³

et al. 2014

Opt. Express

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This study details a one-time ray-tracing optimization method for the optimization of LED illumination systems [S.-C. Chu and H.-L. Yang, "One-time ray-tracing method for the optimization of illumination system," in Proceedings of International Conference on Optics in Precision Engineering and Nanotechnology (icOPEN, 2013), 87692M]. This method optimizes the performance of illumination systems by modifying the light source's radiant intensity distribution with a freeform lens, instead of modifying the illumination system structure. Because illumination system structures are unchanged in the design process, a designer can avoid the common problems faced when designing illumination systems, i.e., the repeated and time-consuming ray-tracing process when optimizing the illumination system parameters. The easy approaches of the proposed optimization method to sample the target illumination areas and to divide the light source radiant intensity distribution make the proposed method can be applied to both direct-lit and non-direct-lit illumination systems. To demonstrate the proposed method, this study designs an illuminator for a tube photo-bioreactor using the proposed one-time ray-tracing method. A comparison shows that in the designing of the photo-bioreactor, tracing all rays one time requires about 13 hours, while optimizing the light source's radiant intensity distribution requires only about twenty minutes. The considerable reduction in the ray-tracing time shows that the proposed method is a fast and effective way to design illumination systems.

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“…Furthermore, these guides can fulfil legal requirements by less LEDs and provide more uniform illuminance. 7–9…”

Section: Introductionmentioning

confidence: 99%

“…For the optical design of a long light guide with circular cross section, the most important parameters that affect the luminous intensity and the illuminance uniformity are length, diameter, possible bending, the prism geometry and the distribution characteristics of the light source. 7–15…”

Section: Introductionmentioning

confidence: 99%

Optical design of light guide prisms with surface roughness for automotive tail lights

Güney

Alper

Hacıismailoğlu

2020

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study presents the optical design of light guide prisms for automotive tail light applications to obtain the optimum luminous intensity and the illuminance uniformity. The design was achieved using optical design software, SPEOS. By considering the axial luminous intensity and legal requirements, the optimum prism angles of light guides were determined by simulations. After determining the prism angles, the effect of different surface roughness on the luminous intensity and the illuminance uniformity was investigated. The light guides designed by considering data from the simulation were manufactured as prototypes and their photometrical measurements were made. These measurements were compared to the simulation results. It was observed that simulation and prototype results are well in agreement with each other. Furthermore, it was found that as the surface roughness increases both the luminous intensity decreases and the illumination becomes more uniform.

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Design of LED edge-lit light bar for automotive taillight applications

Cited by 6 publications

References 6 publications

Optical design and optimization of planar curved LED end-lit light bar

Optical design and optimization of planar curved LED end-lit light bar

One-time ray-tracing optimization method and its application to the design of an illuminator for a tube photo-bioreactor

Optical design of light guide prisms with surface roughness for automotive tail lights

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