Micromilled optical elements for edge-lit illumination panels

Ronny, Rahima Afrose; Knopf, George K.; Bordatchev, Evgueni V.; Nikumb, Suwas

doi:10.1117/1.jmm.12.2.023002

Cited by 6 publications

(4 citation statements)

References 10 publications

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“…Light sources arranged on the edges of light guides are directed and distributed to a uniform planar light by curvature designs [3] or microstructures arranged at one or both sides of the light guide [4][5][6][7]. End-lit lightguide bars (LGBs) in automotive lighting share a similar technology but deal with much more complex geometry, such as rings [8], stripes [9], tubes [10], sheets [11], and panels with three-dimensional curvature.…”

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.

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“…The prism array is located on the upper side of the LED layer to converge the light directions of the LED and decrease the optical glare from the LED emitting surface. The design is similar to the direct backlighting used in flat panel display technology, so it has the advantages of lower power consumption, good thermal design and excellent scalability of the thickness [17,18]. In this study, instead of using an LED point source array or indirect lighting with a micro-prisms sheet in the design of the automotive rear light, a new automotive rear LED light using a micro-prism array device is proposed and demonstrated to pass EU ECE R07 regulation.…”

Section: Optics Design and Simulation Experimentsmentioning

confidence: 99%

“…The prism array is located on the upper side of the LED layer to converge the light directions of the LED and decrease the optical glare from the LED emitting surface. The design is similar to the direct backlighting used in flat panel display technology, so it has the advantages of lower power consumption, good thermal design and excellent scalability of the thickness [17,18]. The proposed rear light includes a position lamp and a braking lamp, which are both constructed by one layer of LEDs and one layer of micro prism array, as shown in Figure 3 [14][15][16].…”

Section: Optics Design and Simulation Experimentsmentioning

confidence: 99%

Section: Optics Design and Simulation Experimentsmentioning

confidence: 99%

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Design of Low-Glared LED Rear Light of Automotive for EU ECE Regulation by Use of Optimized Micro-Prisms Array

Liao

et al. 2020

Crystals

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A new LED rear light for automotives is proposed and demonstrated for EU ECE R07 regulation. The full rear light is a combination of a position lamp and a braking lamp, and LED light bars and micro-prisms are involved as their essential components. The micro-prisms are applied to homogenize the output of the rear light to decrease glare and accomplish EU ECE standard. Through experiments, it is shown that EU ECE R07 regulation can be met in the proposed rear light, and 12% (position lamps) and 26.5% (braking lamps) higher candela can be enhanced after the optimization of micro-prisms.

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