LED projector with two liquid crystal on silicon light valves and a fly’s eye integrator

Giel, Bart Van; Meuret, Youri; Bogaert, Lawrence; Murat, Hüseyin; Smet, Herbert De; Thienpont, Hugo

doi:10.1016/j.displa.2008.03.003

Cited by 6 publications

(5 citation statements)

References 17 publications

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“…The efficiencies through the projection system for red, blue, and green are, respectively, 36.9%, 37.2%, and 40.7%, much higher-more than 1.5 times-than the efficiency of the projector reported in [21][22]. And the efficiencies of the illumination system (from light-collecting optics to relay system) for red, blue, and green are 87.3%, 84.7%, and 88%, respectively, which are also much higher than the value (58%) reported in [23]. As stated in [21][22][23], LEDs are used as light sources in the projection systems based on LCOS technology.…”

Section: Illumination Systemmentioning

confidence: 60%

“…And the efficiencies of the illumination system (from light-collecting optics to relay system) for red, blue, and green are 87.3%, 84.7%, and 88%, respectively, which are also much higher than the value (58%) reported in [23]. As stated in [21][22][23], LEDs are used as light sources in the projection systems based on LCOS technology. The light of LEDs is unpolarized and the LED etendue is much higher than LCOS etendue.…”

Section: Illumination Systemmentioning

confidence: 88%

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Demonstration of a home projector based on RGB semiconductor lasers

et al. 2012

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In this paper, we demonstrate a high-definition 3-liquid-crystal-on-silicon (3-LCOS) home cinema projection system based on RGB laser source modules. Both red and blue laser modules are composed of an array of laser diodes, and the green laser is based on an optically pumped semiconductor laser. The illumination engine is designed to realize high energy efficiency, uniform illumination, and suppression of speckle noise. The presented laser projection system producing 1362 lm D65 light has a volume of about 450×360×160 mm3.

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Section: Illumination Systemmentioning

confidence: 60%

Section: Illumination Systemmentioning

confidence: 88%

Demonstration of a home projector based on RGB semiconductor lasers

et al. 2012

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“…The MC method has been used in a broad range of applications [2], including the simulation of light propagation through systems. The method is popular in a variety of fields, including optical modeling of tissue [2][3][4], design of lighting and display applications [5][6][7], computer graphics [8][9][10], and simulation of solar applications [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Taking the spectral overlap between excitation and emission spectra of fluorescent materials into account with Monte Carlo simulations

et al. 2014

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Monte Carlo ray tracing is an important simulation tool in applications where fluorescence is present, e.g. in bio-medical applications and in the design of luminaires and luminescent solar concentrators. A frequently used ray tracing procedure for fluorescence is the 'dual stage' approach. In this approach, first, all sources are traced through the system and the rays absorbed in the fluorescent components are stored. Next, the emission from the fluorescent components is traced. This approach does not allow for subsequent re-absorption and re-emission effects in fluorescent materials with a spectral overlap between excitation and emission spectra.In this work, a 'multi stage' ray tracing procedure for the simulation of luminescence is presented. Herein, wavelengths are traced from short to long separately and no distinction is made regarding the origin of emission (either a fluorescent component or a source). The presented approach can be easily implemented in existing commercial ray tracing software thus reducing the programming efforts for the new ray tracing algorithm and taking advantage of the strength of the selected ray tracing package concerning the modelling of complex geometrical systems.Both techniques are compared to investigate the influence of the selected ray tracing approach on the efficiency and colour prediction of a remote phosphor LED module.

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“…The advantages of LEDs include energy saving, environmental protection, small size, and long service life [1]. With the development of LEDs, many projectors have been designed using LEDs as the light source to project images on the screen [2][3][4][5][6][7]. In 1987, digital light processing projection technology was developed by Texas Instruments.…”

Section: Introductionmentioning

confidence: 99%

Compact LED projector design with high uniformity and efficiency

et al. 2014

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The aim of this study is to design a compact LED projector that is divided into two systems: an illumination system and an imaging optical system. The illumination system consists of an RGB LED light source with a collimator lens group and a mirror with a color filter and a lens array integrator instead of an integrated rod so as to improve the uniformity of the light intensity. By using a new total internal reflection prism and projection lens, the whole optical engine is smaller in size and has a higher contrast ratio for image quality. The imaging optical system consists of a total of eight lenses (six spherical lenses and two aspherical lenses), for a total length of 52 mm; a tolerance analysis is conducted. Optical simulation software is used for the system analysis in order to determine the efficiency and uniformity of the light intensity. In this design, the uniformity of the screen reaches more than 82%, and the efficiency increases by more than 44%.

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LED projector with two liquid crystal on silicon light valves and a fly’s eye integrator

Cited by 6 publications

References 17 publications

Demonstration of a home projector based on RGB semiconductor lasers

Demonstration of a home projector based on RGB semiconductor lasers

Taking the spectral overlap between excitation and emission spectra of fluorescent materials into account with Monte Carlo simulations

Compact LED projector design with high uniformity and efficiency

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