Details
| Original language | English |
|---|---|
| Title of host publication | Light-Emitting Diodes |
| Subtitle of host publication | Materials, Devices, and Applications for Solid State Lighting XXII |
| Editors | Michael R. Krames, Martin Strassburg, Li-Wei Tu, Jong Kyu Kim |
| Publisher | SPIE |
| ISBN (electronic) | 9781510615939 |
| Publication status | Published - 14 Feb 2018 |
| Event | Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII 2018 - San Francisco, United States Duration: 29 Jan 2018 → 31 Jan 2018 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 10554 |
| ISSN (Print) | 0277-786X |
| ISSN (electronic) | 1996-756X |
Abstract
Highly adaptive light sources such as LED arrays have been surpassing conventional light sources (halogen, xenon) for automotive applications. Individual LED arrangements within the array, high durability and low energy consumption of the LEDs are some of the reasons. With the introduction of Audi's Matrix beam system, efforts to increase the quantity of pixels were already underway and the stage was practically set for pixel light systems. Current efforts are focused towards the exploration of an optimal LED array density and the use of spatial light modulators. In both cases, one question remains - What arrangement of LEDs is the most suitable in terms of light output efficiency for a given lens geometry? The radiation characteristics of an LED usually shows a Lambertian pattern. Following from the definition of luminous efficacy, this characteristic property of LEDs has a decisive impact on the lens geometry in a given array. Due to the proportional correlation between the lens diameter and the distance of LEDs emission surface to the lens surface. Assuming a constant viewing angle an increase of the distance leads to an increase of the lens diameter. In this paper, two different approaches for an optimized LED array with regards to the LED arrangement will be presented. The introduced designs result from one imaging and one non-imaging optical system, which will be investigated. The paper is concluded with a comparative analysis of the LED array design as a function of the LED pitch and the luminous efficacy.
Keywords
- Imaging Optical Systems, LED Array, Lens Design, Lens Geometry, Light Emitting Diode, Luminous Efficacy, Non-Imaging Optical Systems, Étendue
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
Sustainable Development Goals
Cite this
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- Harvard
- Apa
- Vancouver
- BibTeX
- RIS
Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII. ed. / Michael R. Krames; Martin Strassburg; Li-Wei Tu; Jong Kyu Kim. SPIE, 2018. 1055405 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 10554).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Analysis of LED arrangement in an array with respect to lens geometry
AU - Ley, Peer Phillip
AU - Held, Marcel Philipp
AU - Lachmayer, Roland
PY - 2018/2/14
Y1 - 2018/2/14
N2 - Highly adaptive light sources such as LED arrays have been surpassing conventional light sources (halogen, xenon) for automotive applications. Individual LED arrangements within the array, high durability and low energy consumption of the LEDs are some of the reasons. With the introduction of Audi's Matrix beam system, efforts to increase the quantity of pixels were already underway and the stage was practically set for pixel light systems. Current efforts are focused towards the exploration of an optimal LED array density and the use of spatial light modulators. In both cases, one question remains - What arrangement of LEDs is the most suitable in terms of light output efficiency for a given lens geometry? The radiation characteristics of an LED usually shows a Lambertian pattern. Following from the definition of luminous efficacy, this characteristic property of LEDs has a decisive impact on the lens geometry in a given array. Due to the proportional correlation between the lens diameter and the distance of LEDs emission surface to the lens surface. Assuming a constant viewing angle an increase of the distance leads to an increase of the lens diameter. In this paper, two different approaches for an optimized LED array with regards to the LED arrangement will be presented. The introduced designs result from one imaging and one non-imaging optical system, which will be investigated. The paper is concluded with a comparative analysis of the LED array design as a function of the LED pitch and the luminous efficacy.
AB - Highly adaptive light sources such as LED arrays have been surpassing conventional light sources (halogen, xenon) for automotive applications. Individual LED arrangements within the array, high durability and low energy consumption of the LEDs are some of the reasons. With the introduction of Audi's Matrix beam system, efforts to increase the quantity of pixels were already underway and the stage was practically set for pixel light systems. Current efforts are focused towards the exploration of an optimal LED array density and the use of spatial light modulators. In both cases, one question remains - What arrangement of LEDs is the most suitable in terms of light output efficiency for a given lens geometry? The radiation characteristics of an LED usually shows a Lambertian pattern. Following from the definition of luminous efficacy, this characteristic property of LEDs has a decisive impact on the lens geometry in a given array. Due to the proportional correlation between the lens diameter and the distance of LEDs emission surface to the lens surface. Assuming a constant viewing angle an increase of the distance leads to an increase of the lens diameter. In this paper, two different approaches for an optimized LED array with regards to the LED arrangement will be presented. The introduced designs result from one imaging and one non-imaging optical system, which will be investigated. The paper is concluded with a comparative analysis of the LED array design as a function of the LED pitch and the luminous efficacy.
KW - Imaging Optical Systems
KW - LED Array
KW - Lens Design
KW - Lens Geometry
KW - Light Emitting Diode
KW - Luminous Efficacy
KW - Non-Imaging Optical Systems
KW - Étendue
UR - http://www.scopus.com/inward/record.url?scp=85047837138&partnerID=8YFLogxK
U2 - 10.1117/12.2290253
DO - 10.1117/12.2290253
M3 - Conference contribution
AN - SCOPUS:85047837138
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Light-Emitting Diodes
A2 - Krames, Michael R.
A2 - Strassburg, Martin
A2 - Tu, Li-Wei
A2 - Kim, Jong Kyu
PB - SPIE
T2 - Light-Emitting Diodes: Materials, Devices, and Applications for Solid State Lighting XXII 2018
Y2 - 29 January 2018 through 31 January 2018
ER -