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

Murat, Hüseyin; Smet, Herbert De; Cuypers, Dieter

doi:10.1016/j.displa.2006.02.002

Cited by 18 publications

(11 citation statements)

References 2 publications

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“…In Table 2 we summarize the possible losses in three color channels. 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].…”

Section: Illumination Systemmentioning

confidence: 64%

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: 64%

Demonstration of a home projector based on RGB semiconductor lasers

et al. 2012

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“…Our design utilized a Phlatlight pt54 projection chip [2] as the light source. It has an emitting area of 5.4 mm 2 and an operating current of 13.5 A.…”

Section: Led Light Sourcementioning

confidence: 99%

“…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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“…A typical illumination system is composed of the light source, the color mixing system, integral components, the beam splitter prism, and the micro-display panel [5,6]. Employing LEDs as light sources, a number of studies have been mainly focused on the integral components, including light pipes [7], lens arrays [8], compound parabolic concentrators [9], or gradual enlarging tapered light pipes [10,11], with few of them paying enough attention to the color mixing system. However, the color mixing system deserves additional attention, because it also plays an important role in determining the optical performance and the compactness of the projection system.…”

Section: Introductionmentioning

confidence: 99%

Design of off-axis arranged light-emitting diodes and dual dichroic mirrors based color mixing system for micro-projection display

Chen

Guo

2014

Appl. Opt.

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A simple but efficient color mixing system for micro-projection display is presented in this paper, which has employed off-axis arranged LEDs and specifically designed dichroic mirrors in order to achieve higher optical efficiency and a better space utilization ratio compared with previous systems. The design method of the dual-dichroic-mirror (DDM) system is investigated both analytically and numerically. The design results are consistent with the theoretical calculation, and the advantages of the proposed DDM system are obvious. Compared with traditional systems that are commonly used in micro-projectors, the DDM system has indicated a much higher collection efficiency (up to 93.36%) with a significantly reduced size of 1.47 cc. Equipped with the DDM system, the designed micro-projector has realized an energy utilization ratio of 76.92% and an irradiance uniformity of 96.59% with an ultra-compact volume of 28.8 mm×28.1 mm×10 mm, which is competent for embedded projection display. It is believed that such a design has good prospects in commercialized production in the future.

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

Cited by 18 publications

References 2 publications

Demonstration of a home projector based on RGB semiconductor lasers

Demonstration of a home projector based on RGB semiconductor lasers

Compact LED projector design with high uniformity and efficiency

Design of off-axis arranged light-emitting diodes and dual dichroic mirrors based color mixing system for micro-projection display

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