&lt;title&gt;Increased lumens per etendue by combining pulsed LEDs&lt;/title&gt;

Murat, Hüseyin; Smet, Herbert De; Cuypers, Dieter; Meuret, Youri; Thienpont, Hugo; Vervaeke, Michael; Desmet, Lieven

doi:10.1117/12.588312

Cited by 10 publications

(8 citation statements)

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“…The uniformity is evaluated using ANSI/NAPM IT7.228-1997 standard, 10,11 by which we choose those nine measurement points to find the minimum value L m and calculate the average value L a among L 1 ∼ L 9 , where L refers to the illuminance value. Then the evaluation goes to ½1 − jL m − L a j∕L a × 100% ¼ N%; (6) in which, the minimum value of N% is considered as the uniformity.…”

Section: Standards Of Evaluation For Optical Parametersmentioning

confidence: 99%

“…Passing through the whole complex illumination system, the light finally reaching the DMD remains only ∼20 30% of its original power. [6][7][8][9] In comparison, this novel illumination system based on laser sources and GRIN lens arrays greatly simplifies the structure of optical engine. As shown in Fig.…”

Section: Structure Of Optical Engine and Illumination Systemmentioning

confidence: 99%

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Optical design in illumination system of digital light processing projector using laser and gradient-index lens

Rui

Lin

et al. 2012

Opt. Eng

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A novel structure of illumination system based on laser sources and gradient-index (GRIN) lens arrays for single-plate digital light processing (DLP) projector is proposed. Under the evaluation of light collection efficiency and illumination uniformity, we designed two different architectures of GRIN lens arrays: the unit lens cross section being either square or circular. Also, we designed the one-to-one coupling mechanism between GRIN lens array and Gaussian beam array. By means of threedimensional modeling and ray tracing, we simulated the optical characteristics of illumination system, and the optical parameters are evaluated. Results show that the total light collection efficiency is 37.9%, the illumination uniformity is 89.7% and the volume is only 12.4 cm 3 . Thus we improved optical characteristics and reduced the physical dimension of DLP optical engine.

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Section: Standards Of Evaluation For Optical Parametersmentioning

confidence: 99%

Section: Structure Of Optical Engine and Illumination Systemmentioning

confidence: 99%

Optical design in illumination system of digital light processing projector using laser and gradient-index lens

Rui

Lin

et al. 2012

Opt. Eng

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show abstract

“…The optical power per unit of étendue is significantly lower than e.g. an UHP lamp (at least 20 times) [2]. This makes it difficult to achieve a high luminance on the screen.…”

Section: Introductionmentioning

confidence: 99%

Design of axisymmetrical tailored concentrators for LED light source applications

2006

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In our contribution we present a solution to an important question in the design of a LED-based illumination engine for projection systems: the collimation of the LED light. We tested the principle in the modification of a common device in non-imaging optics, the compound Parabolic Concentrator. This CPC-like achieves a collection of 72% (ideal reflective coating presumed). This CPC-like was tailored by numerically solving an differential equation. This approach has some serious drawbacks. For a compact collection device with high collimation, an other approach is required. A more elegant design strategy will rely fully on geometrical principles. The result of our work is a compound collection lens that achieves a collection efficiency of 87%, assuming an ideal reflective coating and neglecting Fresnel losses. We study the performance of this device in detail. Further enhancements are suggested.

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“…They have many advantages [1] such as: compactness, larger color gamut, longer lifetime, lower supply voltage, large dimming ratio, absence of UV, IR and mercury, etc. The main disadvantage is their low optical power per unit of étendue.…”

Section: Introductionmentioning

confidence: 99%

Compact LED projector with tapered light pipes for moderate light output applications

2006

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<title>Increased lumens per etendue by combining pulsed LEDs</title>

Cited by 10 publications

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Optical design in illumination system of digital light processing projector using laser and gradient-index lens

Optical design in illumination system of digital light processing projector using laser and gradient-index lens

Design of axisymmetrical tailored concentrators for LED light source applications

Compact LED projector with tapered light pipes for moderate light output applications

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