Rectangular illumination using a secondary optics with cylindrical lens for LED street light

Chen, Hsi‐Chao; Lin, Junyu; Chiu, Hsuan-Yi

doi:10.1364/oe.21.003201

Cited by 46 publications

(19 citation statements)

References 17 publications

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“…Work in optics has demonstrated the large potential of materials and geometries to efficiently transport light (e.g. optic fiber), micro-array lenses to homogeneously diffuse light [26], or double-cylindrical lenses to shape light into rectangular beams [4]. Interactive objects have also been enabled by sensing changes in light through embedded optomechanics [2,22,28].…”

Section: Interactive Potential Of Secondary Opticsmentioning

confidence: 99%

Illumination Aesthetics

Torres

O'Leary

Nicholas

et al. 2017

Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems

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Figure 1. a) an illuminated hairpin (1 led); a tactile flexible diffuser cast with small glass beads creates diffusion and shadow, b) a sun-moon light art piece (25 leds); a computationally generated reflector controls light rays to form soft and hard edges to blend colored lights, c) a dynamic tactile map of an urban center (16 leds); volumetric diffusers indicate building locations; buildings light up in succession to indicate pathways.

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Section: Interactive Potential Of Secondary Opticsmentioning

confidence: 99%

Illumination Aesthetics

Torres

O'Leary

Nicholas

et al. 2017

Proceedings of the 2017 CHI Conference on Human Factors in Computing Systems

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“…Yi Ding et al 12 establish a first-order partial differential equation to calculate the free-form lens with a positive consequence according to the refraction equation and energy conservation. Hsichao Chen et al 13 design a cylindrical lens to form a rectangular illumination. Yichien Lo et al 14 fabricate a butterfly-shaped lens for the integrated LED, reaching the road lighting standards as well.…”

Section: Introductionmentioning

confidence: 99%

The design and optimization of lens array for LED backlight in LCD imaging engine of helmet‐mounted display

et al. 2017

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The light‐emitting diode has become the mainstream lightsource for backlight in the liquid crystal display imaging engine of helmet‐mounted display. The paper proposes a secondary‐optics‐based design to increase the luminance and obtain a uniform illumination. Based on a point lightsource, a single double‐freeform‐surface lens is firstly designed. Then an optimization is performed according to the theory of edge‐ray to improve the uniformity for planar source. As a result, the uniformity reaches 83.4% in a circular illumination with a diameter of 8 mm. Then the lens is cut and four rectangular lenses are combined to form a lens array. But the combination leads to a non‐uniformity. So a method of optimizing the light energy distribution on the target surface is proposed. Finally, the designed lens array is manufactured. The practical measurement results show that the luminance increases by 96.4% compared with the traditional backlight and that the non‐uniformity slightly decreases by 0.86%. The lens array designed in this paper presents high practicability for applications in helmet‐mounted display.

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“…Thanks to such advantages, LEDs are widely used in various kinds of indoor and outdoor lighting, indicator lights, and display devices [2][3][4][5][6]. However, since the luminous flux emitted from an LED has a Lambertian distribution, secondary optics for controlling the luminous flux are necessary to form a desired illuminance distribution on a target plane [7].…”

Section: Introductionmentioning

confidence: 99%

Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination

Yang¹,

Park²,

Beom‐Hoan³

et al. 2016

Journal of the Optical Society of Korea

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In this paper, we propose a novel differential equation method for designing a total internal reflection (TIR) LED lens with double freeform surfaces. A complete set of simultaneous differential equations for the method is derived from the condition for minimizing the Fresnel loss, illumination models, Snell's Law of ray propagation, and a new constraint on the incident angle of a ray on the light-exiting surface of the lens. The last constraint is essential to complete the set of simultaneous differential equations. By adopting the TIR structure and applying the condition for minimizing the Fresnel loss, it is expected that the proposed TIR LED lens can have a high luminous flux efficiency, even though its beam-spread angle is narrow. To validate the proposed method, three TIR LED lenses with beam-spread angles of less than 22.6° have been designed, and their performances evaluated by ray tracing. Their luminous flux efficiencies could be obviously increased by at least 35% and 5%, compared to conventional LED lenses with a single freeform surface and with double freeform surfaces, respectively.

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Rectangular illumination using a secondary optics with cylindrical lens for LED street light

Cited by 46 publications

References 17 publications

Illumination Aesthetics

Illumination Aesthetics

The design and optimization of lens array for LED backlight in LCD imaging engine of helmet‐mounted display

Design Method for a Total Internal Reflection LED Lens with Double Freeform Surfaces for Narrow and Uniform Illumination

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